/mandos/release

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  • Committer: Teddy Hogeborn
  • Date: 2008-07-29 03:35:39 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080729033539-08zecoj3jwlkpjhw
* server.conf: New file.

* mandos-clients.conf: Renamed to clients.conf.

* Makefile (FORTIFY): New.
  (CFLAGS): Include $(FORTIFY).

* plugins.d/mandosclient.c (main): New "if_index" variable.  Bug fix:
                                   check if interface exists.  New
                                   "--connect" option.

* server.py (serviceInterface): Removed; replaced by
                                "AvahiService.interface".  All users
                                changed.
  (AvahiError, AvahiServiceError, AvahiGroupError): New exception
                                                    classes.
  (AvahiService): New class.
  (serviceName): Removed; replaced by "AvahiService.name".  All users
                 changed.
  (serviceType): Removed; replaced by "AvahiService.type".  All users
                 changed.
  (servicePort): Removed; replaced by "AvahiService.port".  All users
                 changed.
  (serviceTXT): Removed; replaced by "AvahiService.TXT".  All users
                changed.
  (domain): Removed; replaced by "AvahiService.domain".  All users
            changed.
  (host): Removed; replaced by "AvahiService.host".  All users
          changed.
  (rename_count): Removed; replaced by "AvahiService.rename_count" and
                 "AvahiService.max_renames".  All users changed.
  (Client.__init__): If no secret or secfile, raise TypeError instead
                     of RuntimeError.
  (Client.last_seen): Renamed to "Client.last_checked_ok".  All users
                      changed.
  (Client.stop, Client.stop_checker): Use "getattr" with default value
                                      instead of "hasattr".
  (Client.still_valid): Removed "now" argument.
  (Client.handle): Separate the "no client found" and "client invalid"
                   cases for clearer code.
  (IPv6_TCPServer.__init__): "options" argument replaced by
                             "settings".  All callers changed.
  (IPv6_TCPServer.options): Replaced by "IPv6_TCPServer.settings".
                            All users changed.
  (IPv6_TCPServer.server_bind): Use getattr instead of hasattr.
  (add_service): Removed; replaced by "AvahiService.add".  All callers
                 changed.
  (remove_service): Removed; replaced by "AvahiService.remove".  All
                    callers changed.
  (entry_group_state_changed): On entry group collision, call the new
                               AvahiService.rename method.  Raise
                               AvahiGroupError on group error.
  (if_nametoindex): Use ctypes.utils.find_library to locate the C
                    library.  Cache the result.  Loop on EINTR.
  (daemon): Use os.path.devnull to locate "/dev/null".
  (killme): Removed.  All callers changed to do "sys.exit()" instead,
            except where stated otherwise.
  (main): Removed "exitstatus".  Removed all default values from all
          non-bool options.  New option "--configdir".  New variables
          "server_defaults" and "server_settings", read from
          "%(configdir)s/server.conf".  Let any supplied command line
          options override server settings.   Variable "defaults"
          renamed to "client_defaults", which is read from
          "clients.conf" instead of "mandos-clients.conf".  New global
          AvahiService object "service" replaces old global variables.
          Catch AvahiError and exit with error if caught.

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added added

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Lines of Context:
6
6
# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
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".
 
9
# following functions: "AvahiService.add", "AvahiService.remove",
 
10
# "server_state_changed", "entry_group_state_changed", and some lines
 
11
# in "main".
12
12
13
13
# Everything else is
14
 
# Copyright © 2008-2016 Teddy Hogeborn
15
 
# Copyright © 2008-2016 Björn Påhlsson
 
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
16
15
17
16
# This program is free software: you can redistribute it and/or modify
18
17
# it under the terms of the GNU General Public License as published by
25
24
#     GNU General Public License for more details.
26
25
27
26
# 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
 
try:
38
 
    from future_builtins import *
39
 
except ImportError:
40
 
    pass
41
 
 
42
 
try:
43
 
    import SocketServer as socketserver
44
 
except ImportError:
45
 
    import socketserver
 
27
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
28
 
29
# Contact the authors at <mandos@fukt.bsnet.se>.
 
30
 
31
 
 
32
from __future__ import division
 
33
 
 
34
import SocketServer
46
35
import socket
47
 
import argparse
 
36
import select
 
37
from optparse import OptionParser
48
38
import datetime
49
39
import errno
50
 
try:
51
 
    import ConfigParser as configparser
52
 
except ImportError:
53
 
    import configparser
 
40
import gnutls.crypto
 
41
import gnutls.connection
 
42
import gnutls.errors
 
43
import gnutls.library.functions
 
44
import gnutls.library.constants
 
45
import gnutls.library.types
 
46
import ConfigParser
54
47
import sys
55
48
import re
56
49
import os
57
50
import signal
 
51
from sets import Set
58
52
import subprocess
59
53
import atexit
60
54
import stat
61
55
import logging
62
56
import logging.handlers
63
 
import pwd
64
 
import contextlib
65
 
import struct
66
 
import fcntl
67
 
import functools
68
 
try:
69
 
    import cPickle as pickle
70
 
except ImportError:
71
 
    import pickle
72
 
import multiprocessing
73
 
import types
74
 
import binascii
75
 
import tempfile
76
 
import itertools
77
 
import collections
78
 
import codecs
79
57
 
80
58
import dbus
81
 
import dbus.service
82
 
from gi.repository import GLib
 
59
import gobject
 
60
import avahi
83
61
from dbus.mainloop.glib import DBusGMainLoop
84
62
import ctypes
85
 
import ctypes.util
86
 
import xml.dom.minidom
87
 
import inspect
88
 
 
89
 
try:
90
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
91
 
except AttributeError:
92
 
    try:
93
 
        from IN import SO_BINDTODEVICE
94
 
    except ImportError:
95
 
        SO_BINDTODEVICE = None
96
 
 
97
 
if sys.version_info.major == 2:
98
 
    str = unicode
99
 
 
100
 
version = "1.7.7"
101
 
stored_state_file = "clients.pickle"
102
 
 
103
 
logger = logging.getLogger()
104
 
syslogger = None
105
 
 
106
 
try:
107
 
    if_nametoindex = ctypes.cdll.LoadLibrary(
108
 
        ctypes.util.find_library("c")).if_nametoindex
109
 
except (OSError, AttributeError):
110
 
    
111
 
    def if_nametoindex(interface):
112
 
        "Get an interface index the hard way, i.e. using fcntl()"
113
 
        SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
114
 
        with contextlib.closing(socket.socket()) as s:
115
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
116
 
                                struct.pack(b"16s16x", interface))
117
 
        interface_index = struct.unpack("I", ifreq[16:20])[0]
118
 
        return interface_index
119
 
 
120
 
 
121
 
def copy_function(func):
122
 
    """Make a copy of a function"""
123
 
    if sys.version_info.major == 2:
124
 
        return types.FunctionType(func.func_code,
125
 
                                  func.func_globals,
126
 
                                  func.func_name,
127
 
                                  func.func_defaults,
128
 
                                  func.func_closure)
129
 
    else:
130
 
        return types.FunctionType(func.__code__,
131
 
                                  func.__globals__,
132
 
                                  func.__name__,
133
 
                                  func.__defaults__,
134
 
                                  func.__closure__)
135
 
 
136
 
 
137
 
def initlogger(debug, level=logging.WARNING):
138
 
    """init logger and add loglevel"""
139
 
    
140
 
    global syslogger
141
 
    syslogger = (logging.handlers.SysLogHandler(
142
 
        facility = logging.handlers.SysLogHandler.LOG_DAEMON,
143
 
        address = "/dev/log"))
144
 
    syslogger.setFormatter(logging.Formatter
145
 
                           ('Mandos [%(process)d]: %(levelname)s:'
146
 
                            ' %(message)s'))
147
 
    logger.addHandler(syslogger)
148
 
    
149
 
    if debug:
150
 
        console = logging.StreamHandler()
151
 
        console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
152
 
                                               ' [%(process)d]:'
153
 
                                               ' %(levelname)s:'
154
 
                                               ' %(message)s'))
155
 
        logger.addHandler(console)
156
 
    logger.setLevel(level)
157
 
 
158
 
 
159
 
class PGPError(Exception):
160
 
    """Exception if encryption/decryption fails"""
161
 
    pass
162
 
 
163
 
 
164
 
class PGPEngine(object):
165
 
    """A simple class for OpenPGP symmetric encryption & decryption"""
166
 
    
167
 
    def __init__(self):
168
 
        self.tempdir = tempfile.mkdtemp(prefix="mandos-")
169
 
        self.gpg = "gpg"
170
 
        try:
171
 
            output = subprocess.check_output(["gpgconf"])
172
 
            for line in output.splitlines():
173
 
                name, text, path = line.split(b":")
174
 
                if name == "gpg":
175
 
                    self.gpg = path
176
 
                    break
177
 
        except OSError as e:
178
 
            if e.errno != errno.ENOENT:
179
 
                raise
180
 
        self.gnupgargs = ['--batch',
181
 
                          '--homedir', self.tempdir,
182
 
                          '--force-mdc',
183
 
                          '--quiet']
184
 
        # Only GPG version 1 has the --no-use-agent option.
185
 
        if self.gpg == "gpg" or self.gpg.endswith("/gpg"):
186
 
            self.gnupgargs.append("--no-use-agent")
187
 
    
188
 
    def __enter__(self):
189
 
        return self
190
 
    
191
 
    def __exit__(self, exc_type, exc_value, traceback):
192
 
        self._cleanup()
193
 
        return False
194
 
    
195
 
    def __del__(self):
196
 
        self._cleanup()
197
 
    
198
 
    def _cleanup(self):
199
 
        if self.tempdir is not None:
200
 
            # Delete contents of tempdir
201
 
            for root, dirs, files in os.walk(self.tempdir,
202
 
                                             topdown = False):
203
 
                for filename in files:
204
 
                    os.remove(os.path.join(root, filename))
205
 
                for dirname in dirs:
206
 
                    os.rmdir(os.path.join(root, dirname))
207
 
            # Remove tempdir
208
 
            os.rmdir(self.tempdir)
209
 
            self.tempdir = None
210
 
    
211
 
    def password_encode(self, password):
212
 
        # Passphrase can not be empty and can not contain newlines or
213
 
        # NUL bytes.  So we prefix it and hex encode it.
214
 
        encoded = b"mandos" + binascii.hexlify(password)
215
 
        if len(encoded) > 2048:
216
 
            # GnuPG can't handle long passwords, so encode differently
217
 
            encoded = (b"mandos" + password.replace(b"\\", b"\\\\")
218
 
                       .replace(b"\n", b"\\n")
219
 
                       .replace(b"\0", b"\\x00"))
220
 
        return encoded
221
 
    
222
 
    def encrypt(self, data, password):
223
 
        passphrase = self.password_encode(password)
224
 
        with tempfile.NamedTemporaryFile(
225
 
                dir=self.tempdir) as passfile:
226
 
            passfile.write(passphrase)
227
 
            passfile.flush()
228
 
            proc = subprocess.Popen([self.gpg, '--symmetric',
229
 
                                     '--passphrase-file',
230
 
                                     passfile.name]
231
 
                                    + self.gnupgargs,
232
 
                                    stdin = subprocess.PIPE,
233
 
                                    stdout = subprocess.PIPE,
234
 
                                    stderr = subprocess.PIPE)
235
 
            ciphertext, err = proc.communicate(input = data)
236
 
        if proc.returncode != 0:
237
 
            raise PGPError(err)
238
 
        return ciphertext
239
 
    
240
 
    def decrypt(self, data, password):
241
 
        passphrase = self.password_encode(password)
242
 
        with tempfile.NamedTemporaryFile(
243
 
                dir = self.tempdir) as passfile:
244
 
            passfile.write(passphrase)
245
 
            passfile.flush()
246
 
            proc = subprocess.Popen([self.gpg, '--decrypt',
247
 
                                     '--passphrase-file',
248
 
                                     passfile.name]
249
 
                                    + self.gnupgargs,
250
 
                                    stdin = subprocess.PIPE,
251
 
                                    stdout = subprocess.PIPE,
252
 
                                    stderr = subprocess.PIPE)
253
 
            decrypted_plaintext, err = proc.communicate(input = data)
254
 
        if proc.returncode != 0:
255
 
            raise PGPError(err)
256
 
        return decrypted_plaintext
257
 
 
258
 
# Pretend that we have an Avahi module
259
 
class Avahi(object):
260
 
    """This isn't so much a class as it is a module-like namespace.
261
 
    It is instantiated once, and simulates having an Avahi module."""
262
 
    IF_UNSPEC = -1              # avahi-common/address.h
263
 
    PROTO_UNSPEC = -1           # avahi-common/address.h
264
 
    PROTO_INET = 0              # avahi-common/address.h
265
 
    PROTO_INET6 = 1             # avahi-common/address.h
266
 
    DBUS_NAME = "org.freedesktop.Avahi"
267
 
    DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"
268
 
    DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"
269
 
    DBUS_PATH_SERVER = "/"
270
 
    def string_array_to_txt_array(self, t):
271
 
        return dbus.Array((dbus.ByteArray(s.encode("utf-8"))
272
 
                           for s in t), signature="ay")
273
 
    ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h
274
 
    ENTRY_GROUP_COLLISION = 3   # avahi-common/defs.h
275
 
    ENTRY_GROUP_FAILURE = 4     # avahi-common/defs.h
276
 
    SERVER_INVALID = 0          # avahi-common/defs.h
277
 
    SERVER_REGISTERING = 1      # avahi-common/defs.h
278
 
    SERVER_RUNNING = 2          # avahi-common/defs.h
279
 
    SERVER_COLLISION = 3        # avahi-common/defs.h
280
 
    SERVER_FAILURE = 4          # avahi-common/defs.h
281
 
avahi = Avahi()
 
63
 
 
64
# Brief description of the operation of this program:
 
65
 
66
# This server announces itself as a Zeroconf service.  Connecting
 
67
# clients use the TLS protocol, with the unusual quirk that this
 
68
# server program acts as a TLS "client" while a connecting client acts
 
69
# as a TLS "server".  The client (acting as a TLS "server") must
 
70
# supply an OpenPGP certificate, and the fingerprint of this
 
71
# certificate is used by this server to look up (in a list read from a
 
72
# file at start time) which binary blob to give the client.  No other
 
73
# authentication or authorization is done by this server.
 
74
 
 
75
 
 
76
logger = logging.Logger('mandos')
 
77
syslogger = logging.handlers.SysLogHandler\
 
78
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
 
79
syslogger.setFormatter(logging.Formatter\
 
80
                        ('%(levelname)s: %(message)s'))
 
81
logger.addHandler(syslogger)
 
82
del syslogger
 
83
 
282
84
 
283
85
class AvahiError(Exception):
284
 
    def __init__(self, value, *args, **kwargs):
 
86
    def __init__(self, value):
285
87
        self.value = value
286
 
        return super(AvahiError, self).__init__(value, *args,
287
 
                                                **kwargs)
288
 
 
 
88
    def __str__(self):
 
89
        return repr(self.value)
289
90
 
290
91
class AvahiServiceError(AvahiError):
291
92
    pass
292
93
 
293
 
 
294
94
class AvahiGroupError(AvahiError):
295
95
    pass
296
96
 
297
97
 
298
98
class AvahiService(object):
299
 
    """An Avahi (Zeroconf) service.
300
 
    
301
 
    Attributes:
 
99
    """
302
100
    interface: integer; avahi.IF_UNSPEC or an interface index.
303
101
               Used to optionally bind to the specified interface.
304
 
    name: string; Example: 'Mandos'
305
 
    type: string; Example: '_mandos._tcp'.
306
 
     See <https://www.iana.org/assignments/service-names-port-numbers>
307
 
    port: integer; what port to announce
308
 
    TXT: list of strings; TXT record for the service
309
 
    domain: string; Domain to publish on, default to .local if empty.
310
 
    host: string; Host to publish records for, default is localhost
311
 
    max_renames: integer; maximum number of renames
312
 
    rename_count: integer; counter so we only rename after collisions
313
 
                  a sensible number of times
314
 
    group: D-Bus Entry Group
315
 
    server: D-Bus Server
316
 
    bus: dbus.SystemBus()
 
102
    name = string; Example: "Mandos"
 
103
    type = string; Example: "_mandos._tcp".
 
104
                   See <http://www.dns-sd.org/ServiceTypes.html>
 
105
    port = integer; what port to announce
 
106
    TXT = list of strings; TXT record for the service
 
107
    domain = string; Domain to publish on, default to .local if empty.
 
108
    host = string; Host to publish records for, default to localhost
 
109
                   if empty.
 
110
    max_renames = integer; maximum number of renames
 
111
    rename_count = integer; counter so we only rename after collisions
 
112
                   a sensible number of times
317
113
    """
318
 
    
319
 
    def __init__(self,
320
 
                 interface = avahi.IF_UNSPEC,
321
 
                 name = None,
322
 
                 servicetype = None,
323
 
                 port = None,
324
 
                 TXT = None,
325
 
                 domain = "",
326
 
                 host = "",
327
 
                 max_renames = 32768,
328
 
                 protocol = avahi.PROTO_UNSPEC,
329
 
                 bus = None):
 
114
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
 
115
                 type = None, port = None, TXT = None, domain = "",
 
116
                 host = "", max_renames = 12):
 
117
        """An Avahi (Zeroconf) service. """
330
118
        self.interface = interface
331
119
        self.name = name
332
 
        self.type = servicetype
 
120
        self.type = type
333
121
        self.port = port
334
 
        self.TXT = TXT if TXT is not None else []
 
122
        if TXT is None:
 
123
            self.TXT = []
 
124
        else:
 
125
            self.TXT = TXT
335
126
        self.domain = domain
336
127
        self.host = host
337
128
        self.rename_count = 0
338
 
        self.max_renames = max_renames
339
 
        self.protocol = protocol
340
 
        self.group = None       # our entry group
341
 
        self.server = None
342
 
        self.bus = bus
343
 
        self.entry_group_state_changed_match = None
344
 
    
345
 
    def rename(self, remove=True):
 
129
    def rename(self):
346
130
        """Derived from the Avahi example code"""
347
131
        if self.rename_count >= self.max_renames:
348
 
            logger.critical("No suitable Zeroconf service name found"
349
 
                            " after %i retries, exiting.",
350
 
                            self.rename_count)
 
132
            logger.critical(u"No suitable service name found after %i"
 
133
                            u" retries, exiting.", rename_count)
351
134
            raise AvahiServiceError("Too many renames")
352
 
        self.name = str(
353
 
            self.server.GetAlternativeServiceName(self.name))
 
135
        name = server.GetAlternativeServiceName(name)
 
136
        logger.notice(u"Changing name to %r ...", name)
 
137
        self.remove()
 
138
        self.add()
354
139
        self.rename_count += 1
355
 
        logger.info("Changing Zeroconf service name to %r ...",
356
 
                    self.name)
357
 
        if remove:
358
 
            self.remove()
359
 
        try:
360
 
            self.add()
361
 
        except dbus.exceptions.DBusException as error:
362
 
            if (error.get_dbus_name()
363
 
                == "org.freedesktop.Avahi.CollisionError"):
364
 
                logger.info("Local Zeroconf service name collision.")
365
 
                return self.rename(remove=False)
366
 
            else:
367
 
                logger.critical("D-Bus Exception", exc_info=error)
368
 
                self.cleanup()
369
 
                os._exit(1)
370
 
    
371
140
    def remove(self):
372
141
        """Derived from the Avahi example code"""
373
 
        if self.entry_group_state_changed_match is not None:
374
 
            self.entry_group_state_changed_match.remove()
375
 
            self.entry_group_state_changed_match = None
376
 
        if self.group is not None:
377
 
            self.group.Reset()
378
 
    
 
142
        if group is not None:
 
143
            group.Reset()
379
144
    def add(self):
380
145
        """Derived from the Avahi example code"""
381
 
        self.remove()
382
 
        if self.group is None:
383
 
            self.group = dbus.Interface(
384
 
                self.bus.get_object(avahi.DBUS_NAME,
385
 
                                    self.server.EntryGroupNew()),
386
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
387
 
        self.entry_group_state_changed_match = (
388
 
            self.group.connect_to_signal(
389
 
                'StateChanged', self.entry_group_state_changed))
390
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
391
 
                     self.name, self.type)
392
 
        self.group.AddService(
393
 
            self.interface,
394
 
            self.protocol,
395
 
            dbus.UInt32(0),     # flags
396
 
            self.name, self.type,
397
 
            self.domain, self.host,
398
 
            dbus.UInt16(self.port),
399
 
            avahi.string_array_to_txt_array(self.TXT))
400
 
        self.group.Commit()
401
 
    
402
 
    def entry_group_state_changed(self, state, error):
403
 
        """Derived from the Avahi example code"""
404
 
        logger.debug("Avahi entry group state change: %i", state)
405
 
        
406
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
407
 
            logger.debug("Zeroconf service established.")
408
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
409
 
            logger.info("Zeroconf service name collision.")
410
 
            self.rename()
411
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
412
 
            logger.critical("Avahi: Error in group state changed %s",
413
 
                            str(error))
414
 
            raise AvahiGroupError("State changed: {!s}".format(error))
415
 
    
416
 
    def cleanup(self):
417
 
        """Derived from the Avahi example code"""
418
 
        if self.group is not None:
419
 
            try:
420
 
                self.group.Free()
421
 
            except (dbus.exceptions.UnknownMethodException,
422
 
                    dbus.exceptions.DBusException):
423
 
                pass
424
 
            self.group = None
425
 
        self.remove()
426
 
    
427
 
    def server_state_changed(self, state, error=None):
428
 
        """Derived from the Avahi example code"""
429
 
        logger.debug("Avahi server state change: %i", state)
430
 
        bad_states = {
431
 
            avahi.SERVER_INVALID: "Zeroconf server invalid",
432
 
            avahi.SERVER_REGISTERING: None,
433
 
            avahi.SERVER_COLLISION: "Zeroconf server name collision",
434
 
            avahi.SERVER_FAILURE: "Zeroconf server failure",
435
 
        }
436
 
        if state in bad_states:
437
 
            if bad_states[state] is not None:
438
 
                if error is None:
439
 
                    logger.error(bad_states[state])
440
 
                else:
441
 
                    logger.error(bad_states[state] + ": %r", error)
442
 
            self.cleanup()
443
 
        elif state == avahi.SERVER_RUNNING:
444
 
            try:
445
 
                self.add()
446
 
            except dbus.exceptions.DBusException as error:
447
 
                if (error.get_dbus_name()
448
 
                    == "org.freedesktop.Avahi.CollisionError"):
449
 
                    logger.info("Local Zeroconf service name"
450
 
                                " collision.")
451
 
                    return self.rename(remove=False)
452
 
                else:
453
 
                    logger.critical("D-Bus Exception", exc_info=error)
454
 
                    self.cleanup()
455
 
                    os._exit(1)
456
 
        else:
457
 
            if error is None:
458
 
                logger.debug("Unknown state: %r", state)
459
 
            else:
460
 
                logger.debug("Unknown state: %r: %r", state, error)
461
 
    
462
 
    def activate(self):
463
 
        """Derived from the Avahi example code"""
464
 
        if self.server is None:
465
 
            self.server = dbus.Interface(
466
 
                self.bus.get_object(avahi.DBUS_NAME,
467
 
                                    avahi.DBUS_PATH_SERVER,
468
 
                                    follow_name_owner_changes=True),
469
 
                avahi.DBUS_INTERFACE_SERVER)
470
 
        self.server.connect_to_signal("StateChanged",
471
 
                                      self.server_state_changed)
472
 
        self.server_state_changed(self.server.GetState())
473
 
 
474
 
 
475
 
class AvahiServiceToSyslog(AvahiService):
476
 
    def rename(self, *args, **kwargs):
477
 
        """Add the new name to the syslog messages"""
478
 
        ret = AvahiService.rename(self, *args, **kwargs)
479
 
        syslogger.setFormatter(logging.Formatter(
480
 
            'Mandos ({}) [%(process)d]: %(levelname)s: %(message)s'
481
 
            .format(self.name)))
482
 
        return ret
483
 
 
484
 
# Pretend that we have a GnuTLS module
485
 
class GnuTLS(object):
486
 
    """This isn't so much a class as it is a module-like namespace.
487
 
    It is instantiated once, and simulates having a GnuTLS module."""
488
 
    
489
 
    _library = ctypes.cdll.LoadLibrary(
490
 
        ctypes.util.find_library("gnutls"))
491
 
    _need_version = b"3.3.0"
492
 
    def __init__(self):
493
 
        # Need to use class name "GnuTLS" here, since this method is
494
 
        # called before the assignment to the "gnutls" global variable
495
 
        # happens.
496
 
        if GnuTLS.check_version(self._need_version) is None:
497
 
            raise GnuTLS.Error("Needs GnuTLS {} or later"
498
 
                               .format(self._need_version))
499
 
    
500
 
    # Unless otherwise indicated, the constants and types below are
501
 
    # all from the gnutls/gnutls.h C header file.
502
 
    
503
 
    # Constants
504
 
    E_SUCCESS = 0
505
 
    E_INTERRUPTED = -52
506
 
    E_AGAIN = -28
507
 
    CRT_OPENPGP = 2
508
 
    CLIENT = 2
509
 
    SHUT_RDWR = 0
510
 
    CRD_CERTIFICATE = 1
511
 
    E_NO_CERTIFICATE_FOUND = -49
512
 
    OPENPGP_FMT_RAW = 0         # gnutls/openpgp.h
513
 
    
514
 
    # Types
515
 
    class session_int(ctypes.Structure):
516
 
        _fields_ = []
517
 
    session_t = ctypes.POINTER(session_int)
518
 
    class certificate_credentials_st(ctypes.Structure):
519
 
        _fields_ = []
520
 
    certificate_credentials_t = ctypes.POINTER(
521
 
        certificate_credentials_st)
522
 
    certificate_type_t = ctypes.c_int
523
 
    class datum_t(ctypes.Structure):
524
 
        _fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),
525
 
                    ('size', ctypes.c_uint)]
526
 
    class openpgp_crt_int(ctypes.Structure):
527
 
        _fields_ = []
528
 
    openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)
529
 
    openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h
530
 
    log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)
531
 
    credentials_type_t = ctypes.c_int
532
 
    transport_ptr_t = ctypes.c_void_p
533
 
    close_request_t = ctypes.c_int
534
 
    
535
 
    # Exceptions
536
 
    class Error(Exception):
537
 
        # We need to use the class name "GnuTLS" here, since this
538
 
        # exception might be raised from within GnuTLS.__init__,
539
 
        # which is called before the assignment to the "gnutls"
540
 
        # global variable has happened.
541
 
        def __init__(self, message = None, code = None, args=()):
542
 
            # Default usage is by a message string, but if a return
543
 
            # code is passed, convert it to a string with
544
 
            # gnutls.strerror()
545
 
            self.code = code
546
 
            if message is None and code is not None:
547
 
                message = GnuTLS.strerror(code)
548
 
            return super(GnuTLS.Error, self).__init__(
549
 
                message, *args)
550
 
    
551
 
    class CertificateSecurityError(Error):
552
 
        pass
553
 
    
554
 
    # Classes
555
 
    class Credentials(object):
556
 
        def __init__(self):
557
 
            self._c_object = gnutls.certificate_credentials_t()
558
 
            gnutls.certificate_allocate_credentials(
559
 
                ctypes.byref(self._c_object))
560
 
            self.type = gnutls.CRD_CERTIFICATE
561
 
        
562
 
        def __del__(self):
563
 
            gnutls.certificate_free_credentials(self._c_object)
564
 
    
565
 
    class ClientSession(object):
566
 
        def __init__(self, socket, credentials = None):
567
 
            self._c_object = gnutls.session_t()
568
 
            gnutls.init(ctypes.byref(self._c_object), gnutls.CLIENT)
569
 
            gnutls.set_default_priority(self._c_object)
570
 
            gnutls.transport_set_ptr(self._c_object, socket.fileno())
571
 
            gnutls.handshake_set_private_extensions(self._c_object,
572
 
                                                    True)
573
 
            self.socket = socket
574
 
            if credentials is None:
575
 
                credentials = gnutls.Credentials()
576
 
            gnutls.credentials_set(self._c_object, credentials.type,
577
 
                                   ctypes.cast(credentials._c_object,
578
 
                                               ctypes.c_void_p))
579
 
            self.credentials = credentials
580
 
        
581
 
        def __del__(self):
582
 
            gnutls.deinit(self._c_object)
583
 
        
584
 
        def handshake(self):
585
 
            return gnutls.handshake(self._c_object)
586
 
        
587
 
        def send(self, data):
588
 
            data = bytes(data)
589
 
            data_len = len(data)
590
 
            while data_len > 0:
591
 
                data_len -= gnutls.record_send(self._c_object,
592
 
                                               data[-data_len:],
593
 
                                               data_len)
594
 
        
595
 
        def bye(self):
596
 
            return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)
597
 
    
598
 
    # Error handling functions
599
 
    def _error_code(result):
600
 
        """A function to raise exceptions on errors, suitable
601
 
        for the 'restype' attribute on ctypes functions"""
602
 
        if result >= 0:
603
 
            return result
604
 
        if result == gnutls.E_NO_CERTIFICATE_FOUND:
605
 
            raise gnutls.CertificateSecurityError(code = result)
606
 
        raise gnutls.Error(code = result)
607
 
    
608
 
    def _retry_on_error(result, func, arguments):
609
 
        """A function to retry on some errors, suitable
610
 
        for the 'errcheck' attribute on ctypes functions"""
611
 
        while result < 0:
612
 
            if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):
613
 
                return _error_code(result)
614
 
            result = func(*arguments)
615
 
        return result
616
 
    
617
 
    # Unless otherwise indicated, the function declarations below are
618
 
    # all from the gnutls/gnutls.h C header file.
619
 
    
620
 
    # Functions
621
 
    priority_set_direct = _library.gnutls_priority_set_direct
622
 
    priority_set_direct.argtypes = [session_t, ctypes.c_char_p,
623
 
                                    ctypes.POINTER(ctypes.c_char_p)]
624
 
    priority_set_direct.restype = _error_code
625
 
    
626
 
    init = _library.gnutls_init
627
 
    init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]
628
 
    init.restype = _error_code
629
 
    
630
 
    set_default_priority = _library.gnutls_set_default_priority
631
 
    set_default_priority.argtypes = [session_t]
632
 
    set_default_priority.restype = _error_code
633
 
    
634
 
    record_send = _library.gnutls_record_send
635
 
    record_send.argtypes = [session_t, ctypes.c_void_p,
636
 
                            ctypes.c_size_t]
637
 
    record_send.restype = ctypes.c_ssize_t
638
 
    record_send.errcheck = _retry_on_error
639
 
    
640
 
    certificate_allocate_credentials = (
641
 
        _library.gnutls_certificate_allocate_credentials)
642
 
    certificate_allocate_credentials.argtypes = [
643
 
        ctypes.POINTER(certificate_credentials_t)]
644
 
    certificate_allocate_credentials.restype = _error_code
645
 
    
646
 
    certificate_free_credentials = (
647
 
        _library.gnutls_certificate_free_credentials)
648
 
    certificate_free_credentials.argtypes = [certificate_credentials_t]
649
 
    certificate_free_credentials.restype = None
650
 
    
651
 
    handshake_set_private_extensions = (
652
 
        _library.gnutls_handshake_set_private_extensions)
653
 
    handshake_set_private_extensions.argtypes = [session_t,
654
 
                                                 ctypes.c_int]
655
 
    handshake_set_private_extensions.restype = None
656
 
    
657
 
    credentials_set = _library.gnutls_credentials_set
658
 
    credentials_set.argtypes = [session_t, credentials_type_t,
659
 
                                ctypes.c_void_p]
660
 
    credentials_set.restype = _error_code
661
 
    
662
 
    strerror = _library.gnutls_strerror
663
 
    strerror.argtypes = [ctypes.c_int]
664
 
    strerror.restype = ctypes.c_char_p
665
 
    
666
 
    certificate_type_get = _library.gnutls_certificate_type_get
667
 
    certificate_type_get.argtypes = [session_t]
668
 
    certificate_type_get.restype = _error_code
669
 
    
670
 
    certificate_get_peers = _library.gnutls_certificate_get_peers
671
 
    certificate_get_peers.argtypes = [session_t,
672
 
                                      ctypes.POINTER(ctypes.c_uint)]
673
 
    certificate_get_peers.restype = ctypes.POINTER(datum_t)
674
 
    
675
 
    global_set_log_level = _library.gnutls_global_set_log_level
676
 
    global_set_log_level.argtypes = [ctypes.c_int]
677
 
    global_set_log_level.restype = None
678
 
    
679
 
    global_set_log_function = _library.gnutls_global_set_log_function
680
 
    global_set_log_function.argtypes = [log_func]
681
 
    global_set_log_function.restype = None
682
 
    
683
 
    deinit = _library.gnutls_deinit
684
 
    deinit.argtypes = [session_t]
685
 
    deinit.restype = None
686
 
    
687
 
    handshake = _library.gnutls_handshake
688
 
    handshake.argtypes = [session_t]
689
 
    handshake.restype = _error_code
690
 
    handshake.errcheck = _retry_on_error
691
 
    
692
 
    transport_set_ptr = _library.gnutls_transport_set_ptr
693
 
    transport_set_ptr.argtypes = [session_t, transport_ptr_t]
694
 
    transport_set_ptr.restype = None
695
 
    
696
 
    bye = _library.gnutls_bye
697
 
    bye.argtypes = [session_t, close_request_t]
698
 
    bye.restype = _error_code
699
 
    bye.errcheck = _retry_on_error
700
 
    
701
 
    check_version = _library.gnutls_check_version
702
 
    check_version.argtypes = [ctypes.c_char_p]
703
 
    check_version.restype = ctypes.c_char_p
704
 
    
705
 
    # All the function declarations below are from gnutls/openpgp.h
706
 
    
707
 
    openpgp_crt_init = _library.gnutls_openpgp_crt_init
708
 
    openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]
709
 
    openpgp_crt_init.restype = _error_code
710
 
    
711
 
    openpgp_crt_import = _library.gnutls_openpgp_crt_import
712
 
    openpgp_crt_import.argtypes = [openpgp_crt_t,
713
 
                                   ctypes.POINTER(datum_t),
714
 
                                   openpgp_crt_fmt_t]
715
 
    openpgp_crt_import.restype = _error_code
716
 
    
717
 
    openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self
718
 
    openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,
719
 
                                        ctypes.POINTER(ctypes.c_uint)]
720
 
    openpgp_crt_verify_self.restype = _error_code
721
 
    
722
 
    openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit
723
 
    openpgp_crt_deinit.argtypes = [openpgp_crt_t]
724
 
    openpgp_crt_deinit.restype = None
725
 
    
726
 
    openpgp_crt_get_fingerprint = (
727
 
        _library.gnutls_openpgp_crt_get_fingerprint)
728
 
    openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,
729
 
                                            ctypes.c_void_p,
730
 
                                            ctypes.POINTER(
731
 
                                                ctypes.c_size_t)]
732
 
    openpgp_crt_get_fingerprint.restype = _error_code
733
 
    
734
 
    # Remove non-public functions
735
 
    del _error_code, _retry_on_error
736
 
# Create the global "gnutls" object, simulating a module
737
 
gnutls = GnuTLS()
738
 
 
739
 
def call_pipe(connection,       # : multiprocessing.Connection
740
 
              func, *args, **kwargs):
741
 
    """This function is meant to be called by multiprocessing.Process
742
 
    
743
 
    This function runs func(*args, **kwargs), and writes the resulting
744
 
    return value on the provided multiprocessing.Connection.
745
 
    """
746
 
    connection.send(func(*args, **kwargs))
747
 
    connection.close()
 
146
        global group
 
147
        if group is None:
 
148
            group = dbus.Interface\
 
149
                    (bus.get_object(avahi.DBUS_NAME,
 
150
                                    server.EntryGroupNew()),
 
151
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
152
            group.connect_to_signal('StateChanged',
 
153
                                    entry_group_state_changed)
 
154
        logger.debug(u"Adding service '%s' of type '%s' ...",
 
155
                     service.name, service.type)
 
156
        group.AddService(
 
157
                self.interface,         # interface
 
158
                avahi.PROTO_INET6,      # protocol
 
159
                dbus.UInt32(0),         # flags
 
160
                self.name, self.type,
 
161
                self.domain, self.host,
 
162
                dbus.UInt16(self.port),
 
163
                avahi.string_array_to_txt_array(self.TXT))
 
164
        group.Commit()
 
165
 
 
166
# From the Avahi example code:
 
167
group = None                            # our entry group
 
168
# End of Avahi example code
 
169
 
748
170
 
749
171
class Client(object):
750
172
    """A representation of a client host served by this server.
751
 
    
752
173
    Attributes:
753
 
    approved:   bool(); 'None' if not yet approved/disapproved
754
 
    approval_delay: datetime.timedelta(); Time to wait for approval
755
 
    approval_duration: datetime.timedelta(); Duration of one approval
756
 
    checker:    subprocess.Popen(); a running checker process used
757
 
                                    to see if the client lives.
758
 
                                    'None' if no process is running.
759
 
    checker_callback_tag: a GLib event source tag, or None
760
 
    checker_command: string; External command which is run to check
761
 
                     if client lives.  %() expansions are done at
 
174
    name:      string; from the config file, used in log messages
 
175
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
176
                 uniquely identify the client
 
177
    secret:    bytestring; sent verbatim (over TLS) to client
 
178
    fqdn:      string (FQDN); available for use by the checker command
 
179
    created:   datetime.datetime(); object creation, not client host
 
180
    last_checked_ok: datetime.datetime() or None if not yet checked OK
 
181
    timeout:   datetime.timedelta(); How long from last_checked_ok
 
182
                                     until this client is invalid
 
183
    interval:  datetime.timedelta(); How often to start a new checker
 
184
    stop_hook: If set, called by stop() as stop_hook(self)
 
185
    checker:   subprocess.Popen(); a running checker process used
 
186
                                   to see if the client lives.
 
187
                                   'None' if no process is running.
 
188
    checker_initiator_tag: a gobject event source tag, or None
 
189
    stop_initiator_tag:    - '' -
 
190
    checker_callback_tag:  - '' -
 
191
    checker_command: string; External command which is run to check if
 
192
                     client lives.  %() expansions are done at
762
193
                     runtime with vars(self) as dict, so that for
763
194
                     instance %(name)s can be used in the command.
764
 
    checker_initiator_tag: a GLib event source tag, or None
765
 
    created:    datetime.datetime(); (UTC) object creation
766
 
    client_structure: Object describing what attributes a client has
767
 
                      and is used for storing the client at exit
768
 
    current_checker_command: string; current running checker_command
769
 
    disable_initiator_tag: a GLib event source tag, or None
770
 
    enabled:    bool()
771
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
772
 
                 uniquely identify the client
773
 
    host:       string; available for use by the checker command
774
 
    interval:   datetime.timedelta(); How often to start a new checker
775
 
    last_approval_request: datetime.datetime(); (UTC) or None
776
 
    last_checked_ok: datetime.datetime(); (UTC) or None
777
 
    last_checker_status: integer between 0 and 255 reflecting exit
778
 
                         status of last checker. -1 reflects crashed
779
 
                         checker, -2 means no checker completed yet.
780
 
    last_checker_signal: The signal which killed the last checker, if
781
 
                         last_checker_status is -1
782
 
    last_enabled: datetime.datetime(); (UTC) or None
783
 
    name:       string; from the config file, used in log messages and
784
 
                        D-Bus identifiers
785
 
    secret:     bytestring; sent verbatim (over TLS) to client
786
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
787
 
                                      until this client is disabled
788
 
    extended_timeout:   extra long timeout when secret has been sent
789
 
    runtime_expansions: Allowed attributes for runtime expansion.
790
 
    expires:    datetime.datetime(); time (UTC) when a client will be
791
 
                disabled, or None
792
 
    server_settings: The server_settings dict from main()
 
195
    Private attibutes:
 
196
    _timeout: Real variable for 'timeout'
 
197
    _interval: Real variable for 'interval'
 
198
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
199
    _interval_milliseconds: - '' -
793
200
    """
794
 
    
795
 
    runtime_expansions = ("approval_delay", "approval_duration",
796
 
                          "created", "enabled", "expires",
797
 
                          "fingerprint", "host", "interval",
798
 
                          "last_approval_request", "last_checked_ok",
799
 
                          "last_enabled", "name", "timeout")
800
 
    client_defaults = {
801
 
        "timeout": "PT5M",
802
 
        "extended_timeout": "PT15M",
803
 
        "interval": "PT2M",
804
 
        "checker": "fping -q -- %%(host)s",
805
 
        "host": "",
806
 
        "approval_delay": "PT0S",
807
 
        "approval_duration": "PT1S",
808
 
        "approved_by_default": "True",
809
 
        "enabled": "True",
810
 
    }
811
 
    
812
 
    @staticmethod
813
 
    def config_parser(config):
814
 
        """Construct a new dict of client settings of this form:
815
 
        { client_name: {setting_name: value, ...}, ...}
816
 
        with exceptions for any special settings as defined above.
817
 
        NOTE: Must be a pure function. Must return the same result
818
 
        value given the same arguments.
819
 
        """
820
 
        settings = {}
821
 
        for client_name in config.sections():
822
 
            section = dict(config.items(client_name))
823
 
            client = settings[client_name] = {}
824
 
            
825
 
            client["host"] = section["host"]
826
 
            # Reformat values from string types to Python types
827
 
            client["approved_by_default"] = config.getboolean(
828
 
                client_name, "approved_by_default")
829
 
            client["enabled"] = config.getboolean(client_name,
830
 
                                                  "enabled")
831
 
            
832
 
            # Uppercase and remove spaces from fingerprint for later
833
 
            # comparison purposes with return value from the
834
 
            # fingerprint() function
835
 
            client["fingerprint"] = (section["fingerprint"].upper()
836
 
                                     .replace(" ", ""))
837
 
            if "secret" in section:
838
 
                client["secret"] = codecs.decode(section["secret"]
839
 
                                                 .encode("utf-8"),
840
 
                                                 "base64")
841
 
            elif "secfile" in section:
842
 
                with open(os.path.expanduser(os.path.expandvars
843
 
                                             (section["secfile"])),
844
 
                          "rb") as secfile:
845
 
                    client["secret"] = secfile.read()
846
 
            else:
847
 
                raise TypeError("No secret or secfile for section {}"
848
 
                                .format(section))
849
 
            client["timeout"] = string_to_delta(section["timeout"])
850
 
            client["extended_timeout"] = string_to_delta(
851
 
                section["extended_timeout"])
852
 
            client["interval"] = string_to_delta(section["interval"])
853
 
            client["approval_delay"] = string_to_delta(
854
 
                section["approval_delay"])
855
 
            client["approval_duration"] = string_to_delta(
856
 
                section["approval_duration"])
857
 
            client["checker_command"] = section["checker"]
858
 
            client["last_approval_request"] = None
859
 
            client["last_checked_ok"] = None
860
 
            client["last_checker_status"] = -2
861
 
        
862
 
        return settings
863
 
    
864
 
    def __init__(self, settings, name = None, server_settings=None):
 
201
    def _set_timeout(self, timeout):
 
202
        "Setter function for 'timeout' attribute"
 
203
        self._timeout = timeout
 
204
        self._timeout_milliseconds = ((self.timeout.days
 
205
                                       * 24 * 60 * 60 * 1000)
 
206
                                      + (self.timeout.seconds * 1000)
 
207
                                      + (self.timeout.microseconds
 
208
                                         // 1000))
 
209
    timeout = property(lambda self: self._timeout,
 
210
                       _set_timeout)
 
211
    del _set_timeout
 
212
    def _set_interval(self, interval):
 
213
        "Setter function for 'interval' attribute"
 
214
        self._interval = interval
 
215
        self._interval_milliseconds = ((self.interval.days
 
216
                                        * 24 * 60 * 60 * 1000)
 
217
                                       + (self.interval.seconds
 
218
                                          * 1000)
 
219
                                       + (self.interval.microseconds
 
220
                                          // 1000))
 
221
    interval = property(lambda self: self._interval,
 
222
                        _set_interval)
 
223
    del _set_interval
 
224
    def __init__(self, name=None, stop_hook=None, fingerprint=None,
 
225
                 secret=None, secfile=None, fqdn=None, timeout=None,
 
226
                 interval=-1, checker=None):
 
227
        """Note: the 'checker' argument sets the 'checker_command'
 
228
        attribute and not the 'checker' attribute.."""
865
229
        self.name = name
866
 
        if server_settings is None:
867
 
            server_settings = {}
868
 
        self.server_settings = server_settings
869
 
        # adding all client settings
870
 
        for setting, value in settings.items():
871
 
            setattr(self, setting, value)
872
 
        
873
 
        if self.enabled:
874
 
            if not hasattr(self, "last_enabled"):
875
 
                self.last_enabled = datetime.datetime.utcnow()
876
 
            if not hasattr(self, "expires"):
877
 
                self.expires = (datetime.datetime.utcnow()
878
 
                                + self.timeout)
 
230
        logger.debug(u"Creating client %r", self.name)
 
231
        # Uppercase and remove spaces from fingerprint
 
232
        # for later comparison purposes with return value of
 
233
        # the fingerprint() function
 
234
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
235
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
 
236
        if secret:
 
237
            self.secret = secret.decode(u"base64")
 
238
        elif secfile:
 
239
            sf = open(secfile)
 
240
            self.secret = sf.read()
 
241
            sf.close()
879
242
        else:
880
 
            self.last_enabled = None
881
 
            self.expires = None
882
 
        
883
 
        logger.debug("Creating client %r", self.name)
884
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
885
 
        self.created = settings.get("created",
886
 
                                    datetime.datetime.utcnow())
887
 
        
888
 
        # attributes specific for this server instance
 
243
            raise TypeError(u"No secret or secfile for client %s"
 
244
                            % self.name)
 
245
        self.fqdn = fqdn
 
246
        self.created = datetime.datetime.now()
 
247
        self.last_checked_ok = None
 
248
        self.timeout = string_to_delta(timeout)
 
249
        self.interval = string_to_delta(interval)
 
250
        self.stop_hook = stop_hook
889
251
        self.checker = None
890
252
        self.checker_initiator_tag = None
891
 
        self.disable_initiator_tag = None
 
253
        self.stop_initiator_tag = None
892
254
        self.checker_callback_tag = None
893
 
        self.current_checker_command = None
894
 
        self.approved = None
895
 
        self.approvals_pending = 0
896
 
        self.changedstate = multiprocessing_manager.Condition(
897
 
            multiprocessing_manager.Lock())
898
 
        self.client_structure = [attr
899
 
                                 for attr in self.__dict__.keys()
900
 
                                 if not attr.startswith("_")]
901
 
        self.client_structure.append("client_structure")
902
 
        
903
 
        for name, t in inspect.getmembers(
904
 
                type(self), lambda obj: isinstance(obj, property)):
905
 
            if not name.startswith("_"):
906
 
                self.client_structure.append(name)
907
 
    
908
 
    # Send notice to process children that client state has changed
909
 
    def send_changedstate(self):
910
 
        with self.changedstate:
911
 
            self.changedstate.notify_all()
912
 
    
913
 
    def enable(self):
 
255
        self.check_command = checker
 
256
    def start(self):
914
257
        """Start this client's checker and timeout hooks"""
915
 
        if getattr(self, "enabled", False):
916
 
            # Already enabled
917
 
            return
918
 
        self.expires = datetime.datetime.utcnow() + self.timeout
919
 
        self.enabled = True
920
 
        self.last_enabled = datetime.datetime.utcnow()
921
 
        self.init_checker()
922
 
        self.send_changedstate()
923
 
    
924
 
    def disable(self, quiet=True):
925
 
        """Disable this client."""
926
 
        if not getattr(self, "enabled", False):
927
 
            return False
928
 
        if not quiet:
929
 
            logger.info("Disabling client %s", self.name)
930
 
        if getattr(self, "disable_initiator_tag", None) is not None:
931
 
            GLib.source_remove(self.disable_initiator_tag)
932
 
            self.disable_initiator_tag = None
933
 
        self.expires = None
934
 
        if getattr(self, "checker_initiator_tag", None) is not None:
935
 
            GLib.source_remove(self.checker_initiator_tag)
936
 
            self.checker_initiator_tag = None
937
 
        self.stop_checker()
938
 
        self.enabled = False
939
 
        if not quiet:
940
 
            self.send_changedstate()
941
 
        # Do not run this again if called by a GLib.timeout_add
942
 
        return False
943
 
    
944
 
    def __del__(self):
945
 
        self.disable()
946
 
    
947
 
    def init_checker(self):
948
258
        # Schedule a new checker to be started an 'interval' from now,
949
259
        # and every interval from then on.
950
 
        if self.checker_initiator_tag is not None:
951
 
            GLib.source_remove(self.checker_initiator_tag)
952
 
        self.checker_initiator_tag = GLib.timeout_add(
953
 
            int(self.interval.total_seconds() * 1000),
954
 
            self.start_checker)
955
 
        # Schedule a disable() when 'timeout' has passed
956
 
        if self.disable_initiator_tag is not None:
957
 
            GLib.source_remove(self.disable_initiator_tag)
958
 
        self.disable_initiator_tag = GLib.timeout_add(
959
 
            int(self.timeout.total_seconds() * 1000), self.disable)
 
260
        self.checker_initiator_tag = gobject.timeout_add\
 
261
                                     (self._interval_milliseconds,
 
262
                                      self.start_checker)
960
263
        # Also start a new checker *right now*.
961
264
        self.start_checker()
962
 
    
963
 
    def checker_callback(self, source, condition, connection,
964
 
                         command):
 
265
        # Schedule a stop() when 'timeout' has passed
 
266
        self.stop_initiator_tag = gobject.timeout_add\
 
267
                                  (self._timeout_milliseconds,
 
268
                                   self.stop)
 
269
    def stop(self):
 
270
        """Stop this client.
 
271
        The possibility that a client might be restarted is left open,
 
272
        but not currently used."""
 
273
        # If this client doesn't have a secret, it is already stopped.
 
274
        if self.secret:
 
275
            logger.debug(u"Stopping client %s", self.name)
 
276
            self.secret = None
 
277
        else:
 
278
            return False
 
279
        if getattr(self, "stop_initiator_tag", False):
 
280
            gobject.source_remove(self.stop_initiator_tag)
 
281
            self.stop_initiator_tag = None
 
282
        if getattr(self, "checker_initiator_tag", False):
 
283
            gobject.source_remove(self.checker_initiator_tag)
 
284
            self.checker_initiator_tag = None
 
285
        self.stop_checker()
 
286
        if self.stop_hook:
 
287
            self.stop_hook(self)
 
288
        # Do not run this again if called by a gobject.timeout_add
 
289
        return False
 
290
    def __del__(self):
 
291
        self.stop_hook = None
 
292
        self.stop()
 
293
    def checker_callback(self, pid, condition):
965
294
        """The checker has completed, so take appropriate actions."""
 
295
        now = datetime.datetime.now()
966
296
        self.checker_callback_tag = None
967
297
        self.checker = None
968
 
        # Read return code from connection (see call_pipe)
969
 
        returncode = connection.recv()
970
 
        connection.close()
971
 
        
972
 
        if returncode >= 0:
973
 
            self.last_checker_status = returncode
974
 
            self.last_checker_signal = None
975
 
            if self.last_checker_status == 0:
976
 
                logger.info("Checker for %(name)s succeeded",
977
 
                            vars(self))
978
 
                self.checked_ok()
979
 
            else:
980
 
                logger.info("Checker for %(name)s failed", vars(self))
981
 
        else:
982
 
            self.last_checker_status = -1
983
 
            self.last_checker_signal = -returncode
984
 
            logger.warning("Checker for %(name)s crashed?",
 
298
        if os.WIFEXITED(condition) \
 
299
               and (os.WEXITSTATUS(condition) == 0):
 
300
            logger.debug(u"Checker for %(name)s succeeded",
 
301
                         vars(self))
 
302
            self.last_checked_ok = now
 
303
            gobject.source_remove(self.stop_initiator_tag)
 
304
            self.stop_initiator_tag = gobject.timeout_add\
 
305
                                      (self._timeout_milliseconds,
 
306
                                       self.stop)
 
307
        elif not os.WIFEXITED(condition):
 
308
            logger.warning(u"Checker for %(name)s crashed?",
985
309
                           vars(self))
986
 
        return False
987
 
    
988
 
    def checked_ok(self):
989
 
        """Assert that the client has been seen, alive and well."""
990
 
        self.last_checked_ok = datetime.datetime.utcnow()
991
 
        self.last_checker_status = 0
992
 
        self.last_checker_signal = None
993
 
        self.bump_timeout()
994
 
    
995
 
    def bump_timeout(self, timeout=None):
996
 
        """Bump up the timeout for this client."""
997
 
        if timeout is None:
998
 
            timeout = self.timeout
999
 
        if self.disable_initiator_tag is not None:
1000
 
            GLib.source_remove(self.disable_initiator_tag)
1001
 
            self.disable_initiator_tag = None
1002
 
        if getattr(self, "enabled", False):
1003
 
            self.disable_initiator_tag = GLib.timeout_add(
1004
 
                int(timeout.total_seconds() * 1000), self.disable)
1005
 
            self.expires = datetime.datetime.utcnow() + timeout
1006
 
    
1007
 
    def need_approval(self):
1008
 
        self.last_approval_request = datetime.datetime.utcnow()
1009
 
    
 
310
        else:
 
311
            logger.debug(u"Checker for %(name)s failed",
 
312
                         vars(self))
1010
313
    def start_checker(self):
1011
314
        """Start a new checker subprocess if one is not running.
1012
 
        
1013
315
        If a checker already exists, leave it running and do
1014
316
        nothing."""
1015
317
        # The reason for not killing a running checker is that if we
1016
 
        # did that, and if a checker (for some reason) started running
1017
 
        # slowly and taking more than 'interval' time, then the client
1018
 
        # would inevitably timeout, since no checker would get a
1019
 
        # chance to run to completion.  If we instead leave running
 
318
        # did that, then if a checker (for some reason) started
 
319
        # running slowly and taking more than 'interval' time, the
 
320
        # client would inevitably timeout, since no checker would get
 
321
        # a chance to run to completion.  If we instead leave running
1020
322
        # checkers alone, the checker would have to take more time
1021
 
        # than 'timeout' for the client to be disabled, which is as it
1022
 
        # should be.
1023
 
        
1024
 
        if self.checker is not None and not self.checker.is_alive():
1025
 
            logger.warning("Checker was not alive; joining")
1026
 
            self.checker.join()
1027
 
            self.checker = None
1028
 
        # Start a new checker if needed
 
323
        # than 'timeout' for the client to be declared invalid, which
 
324
        # is as it should be.
1029
325
        if self.checker is None:
1030
 
            # Escape attributes for the shell
1031
 
            escaped_attrs = {
1032
 
                attr: re.escape(str(getattr(self, attr)))
1033
 
                for attr in self.runtime_expansions }
1034
 
            try:
1035
 
                command = self.checker_command % escaped_attrs
1036
 
            except TypeError as error:
1037
 
                logger.error('Could not format string "%s"',
1038
 
                             self.checker_command,
1039
 
                             exc_info=error)
1040
 
                return True     # Try again later
1041
 
            self.current_checker_command = command
1042
 
            logger.info("Starting checker %r for %s", command,
1043
 
                        self.name)
1044
 
            # We don't need to redirect stdout and stderr, since
1045
 
            # in normal mode, that is already done by daemon(),
1046
 
            # and in debug mode we don't want to.  (Stdin is
1047
 
            # always replaced by /dev/null.)
1048
 
            # The exception is when not debugging but nevertheless
1049
 
            # running in the foreground; use the previously
1050
 
            # created wnull.
1051
 
            popen_args = { "close_fds": True,
1052
 
                           "shell": True,
1053
 
                           "cwd": "/" }
1054
 
            if (not self.server_settings["debug"]
1055
 
                and self.server_settings["foreground"]):
1056
 
                popen_args.update({"stdout": wnull,
1057
 
                                   "stderr": wnull })
1058
 
            pipe = multiprocessing.Pipe(duplex = False)
1059
 
            self.checker = multiprocessing.Process(
1060
 
                target = call_pipe,
1061
 
                args = (pipe[1], subprocess.call, command),
1062
 
                kwargs = popen_args)
1063
 
            self.checker.start()
1064
 
            self.checker_callback_tag = GLib.io_add_watch(
1065
 
                pipe[0].fileno(), GLib.IO_IN,
1066
 
                self.checker_callback, pipe[0], command)
1067
 
        # Re-run this periodically if run by GLib.timeout_add
 
326
            try:
 
327
                # In case check_command has exactly one % operator
 
328
                command = self.check_command % self.fqdn
 
329
            except TypeError:
 
330
                # Escape attributes for the shell
 
331
                escaped_attrs = dict((key, re.escape(str(val)))
 
332
                                     for key, val in
 
333
                                     vars(self).iteritems())
 
334
                try:
 
335
                    command = self.check_command % escaped_attrs
 
336
                except TypeError, error:
 
337
                    logger.error(u'Could not format string "%s":'
 
338
                                 u' %s', self.check_command, error)
 
339
                    return True # Try again later
 
340
            try:
 
341
                logger.debug(u"Starting checker %r for %s",
 
342
                             command, self.name)
 
343
                self.checker = subprocess.Popen(command,
 
344
                                                close_fds=True,
 
345
                                                shell=True, cwd="/")
 
346
                self.checker_callback_tag = gobject.child_watch_add\
 
347
                                            (self.checker.pid,
 
348
                                             self.checker_callback)
 
349
            except subprocess.OSError, error:
 
350
                logger.error(u"Failed to start subprocess: %s",
 
351
                             error)
 
352
        # Re-run this periodically if run by gobject.timeout_add
1068
353
        return True
1069
 
    
1070
354
    def stop_checker(self):
1071
355
        """Force the checker process, if any, to stop."""
1072
356
        if self.checker_callback_tag:
1073
 
            GLib.source_remove(self.checker_callback_tag)
 
357
            gobject.source_remove(self.checker_callback_tag)
1074
358
            self.checker_callback_tag = None
1075
359
        if getattr(self, "checker", None) is None:
1076
360
            return
1077
361
        logger.debug("Stopping checker for %(name)s", vars(self))
1078
 
        self.checker.terminate()
 
362
        try:
 
363
            os.kill(self.checker.pid, signal.SIGTERM)
 
364
            #os.sleep(0.5)
 
365
            #if self.checker.poll() is None:
 
366
            #    os.kill(self.checker.pid, signal.SIGKILL)
 
367
        except OSError, error:
 
368
            if error.errno != errno.ESRCH: # No such process
 
369
                raise
1079
370
        self.checker = None
1080
 
 
1081
 
 
1082
 
def dbus_service_property(dbus_interface,
1083
 
                          signature="v",
1084
 
                          access="readwrite",
1085
 
                          byte_arrays=False):
1086
 
    """Decorators for marking methods of a DBusObjectWithProperties to
1087
 
    become properties on the D-Bus.
1088
 
    
1089
 
    The decorated method will be called with no arguments by "Get"
1090
 
    and with one argument by "Set".
1091
 
    
1092
 
    The parameters, where they are supported, are the same as
1093
 
    dbus.service.method, except there is only "signature", since the
1094
 
    type from Get() and the type sent to Set() is the same.
1095
 
    """
1096
 
    # Encoding deeply encoded byte arrays is not supported yet by the
1097
 
    # "Set" method, so we fail early here:
1098
 
    if byte_arrays and signature != "ay":
1099
 
        raise ValueError("Byte arrays not supported for non-'ay'"
1100
 
                         " signature {!r}".format(signature))
1101
 
    
1102
 
    def decorator(func):
1103
 
        func._dbus_is_property = True
1104
 
        func._dbus_interface = dbus_interface
1105
 
        func._dbus_signature = signature
1106
 
        func._dbus_access = access
1107
 
        func._dbus_name = func.__name__
1108
 
        if func._dbus_name.endswith("_dbus_property"):
1109
 
            func._dbus_name = func._dbus_name[:-14]
1110
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
1111
 
        return func
1112
 
    
1113
 
    return decorator
1114
 
 
1115
 
 
1116
 
def dbus_interface_annotations(dbus_interface):
1117
 
    """Decorator for marking functions returning interface annotations
1118
 
    
1119
 
    Usage:
1120
 
    
1121
 
    @dbus_interface_annotations("org.example.Interface")
1122
 
    def _foo(self):  # Function name does not matter
1123
 
        return {"org.freedesktop.DBus.Deprecated": "true",
1124
 
                "org.freedesktop.DBus.Property.EmitsChangedSignal":
1125
 
                    "false"}
1126
 
    """
1127
 
    
1128
 
    def decorator(func):
1129
 
        func._dbus_is_interface = True
1130
 
        func._dbus_interface = dbus_interface
1131
 
        func._dbus_name = dbus_interface
1132
 
        return func
1133
 
    
1134
 
    return decorator
1135
 
 
1136
 
 
1137
 
def dbus_annotations(annotations):
1138
 
    """Decorator to annotate D-Bus methods, signals or properties
1139
 
    Usage:
1140
 
    
1141
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true",
1142
 
                       "org.freedesktop.DBus.Property."
1143
 
                       "EmitsChangedSignal": "false"})
1144
 
    @dbus_service_property("org.example.Interface", signature="b",
1145
 
                           access="r")
1146
 
    def Property_dbus_property(self):
1147
 
        return dbus.Boolean(False)
1148
 
    
1149
 
    See also the DBusObjectWithAnnotations class.
1150
 
    """
1151
 
    
1152
 
    def decorator(func):
1153
 
        func._dbus_annotations = annotations
1154
 
        return func
1155
 
    
1156
 
    return decorator
1157
 
 
1158
 
 
1159
 
class DBusPropertyException(dbus.exceptions.DBusException):
1160
 
    """A base class for D-Bus property-related exceptions
1161
 
    """
1162
 
    pass
1163
 
 
1164
 
 
1165
 
class DBusPropertyAccessException(DBusPropertyException):
1166
 
    """A property's access permissions disallows an operation.
1167
 
    """
1168
 
    pass
1169
 
 
1170
 
 
1171
 
class DBusPropertyNotFound(DBusPropertyException):
1172
 
    """An attempt was made to access a non-existing property.
1173
 
    """
1174
 
    pass
1175
 
 
1176
 
 
1177
 
class DBusObjectWithAnnotations(dbus.service.Object):
1178
 
    """A D-Bus object with annotations.
1179
 
    
1180
 
    Classes inheriting from this can use the dbus_annotations
1181
 
    decorator to add annotations to methods or signals.
1182
 
    """
1183
 
    
1184
 
    @staticmethod
1185
 
    def _is_dbus_thing(thing):
1186
 
        """Returns a function testing if an attribute is a D-Bus thing
1187
 
        
1188
 
        If called like _is_dbus_thing("method") it returns a function
1189
 
        suitable for use as predicate to inspect.getmembers().
1190
 
        """
1191
 
        return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),
1192
 
                                   False)
1193
 
    
1194
 
    def _get_all_dbus_things(self, thing):
1195
 
        """Returns a generator of (name, attribute) pairs
1196
 
        """
1197
 
        return ((getattr(athing.__get__(self), "_dbus_name", name),
1198
 
                 athing.__get__(self))
1199
 
                for cls in self.__class__.__mro__
1200
 
                for name, athing in
1201
 
                inspect.getmembers(cls, self._is_dbus_thing(thing)))
1202
 
    
1203
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1204
 
                         out_signature = "s",
1205
 
                         path_keyword = 'object_path',
1206
 
                         connection_keyword = 'connection')
1207
 
    def Introspect(self, object_path, connection):
1208
 
        """Overloading of standard D-Bus method.
1209
 
        
1210
 
        Inserts annotation tags on methods and signals.
1211
 
        """
1212
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
1213
 
                                                   connection)
1214
 
        try:
1215
 
            document = xml.dom.minidom.parseString(xmlstring)
1216
 
            
1217
 
            for if_tag in document.getElementsByTagName("interface"):
1218
 
                # Add annotation tags
1219
 
                for typ in ("method", "signal"):
1220
 
                    for tag in if_tag.getElementsByTagName(typ):
1221
 
                        annots = dict()
1222
 
                        for name, prop in (self.
1223
 
                                           _get_all_dbus_things(typ)):
1224
 
                            if (name == tag.getAttribute("name")
1225
 
                                and prop._dbus_interface
1226
 
                                == if_tag.getAttribute("name")):
1227
 
                                annots.update(getattr(
1228
 
                                    prop, "_dbus_annotations", {}))
1229
 
                        for name, value in annots.items():
1230
 
                            ann_tag = document.createElement(
1231
 
                                "annotation")
1232
 
                            ann_tag.setAttribute("name", name)
1233
 
                            ann_tag.setAttribute("value", value)
1234
 
                            tag.appendChild(ann_tag)
1235
 
                # Add interface annotation tags
1236
 
                for annotation, value in dict(
1237
 
                    itertools.chain.from_iterable(
1238
 
                        annotations().items()
1239
 
                        for name, annotations
1240
 
                        in self._get_all_dbus_things("interface")
1241
 
                        if name == if_tag.getAttribute("name")
1242
 
                        )).items():
1243
 
                    ann_tag = document.createElement("annotation")
1244
 
                    ann_tag.setAttribute("name", annotation)
1245
 
                    ann_tag.setAttribute("value", value)
1246
 
                    if_tag.appendChild(ann_tag)
1247
 
                # Fix argument name for the Introspect method itself
1248
 
                if (if_tag.getAttribute("name")
1249
 
                                == dbus.INTROSPECTABLE_IFACE):
1250
 
                    for cn in if_tag.getElementsByTagName("method"):
1251
 
                        if cn.getAttribute("name") == "Introspect":
1252
 
                            for arg in cn.getElementsByTagName("arg"):
1253
 
                                if (arg.getAttribute("direction")
1254
 
                                    == "out"):
1255
 
                                    arg.setAttribute("name",
1256
 
                                                     "xml_data")
1257
 
            xmlstring = document.toxml("utf-8")
1258
 
            document.unlink()
1259
 
        except (AttributeError, xml.dom.DOMException,
1260
 
                xml.parsers.expat.ExpatError) as error:
1261
 
            logger.error("Failed to override Introspection method",
1262
 
                         exc_info=error)
1263
 
        return xmlstring
1264
 
 
1265
 
 
1266
 
class DBusObjectWithProperties(DBusObjectWithAnnotations):
1267
 
    """A D-Bus object with properties.
1268
 
    
1269
 
    Classes inheriting from this can use the dbus_service_property
1270
 
    decorator to expose methods as D-Bus properties.  It exposes the
1271
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
1272
 
    """
1273
 
    
1274
 
    def _get_dbus_property(self, interface_name, property_name):
1275
 
        """Returns a bound method if one exists which is a D-Bus
1276
 
        property with the specified name and interface.
1277
 
        """
1278
 
        for cls in self.__class__.__mro__:
1279
 
            for name, value in inspect.getmembers(
1280
 
                    cls, self._is_dbus_thing("property")):
1281
 
                if (value._dbus_name == property_name
1282
 
                    and value._dbus_interface == interface_name):
1283
 
                    return value.__get__(self)
1284
 
        
1285
 
        # No such property
1286
 
        raise DBusPropertyNotFound("{}:{}.{}".format(
1287
 
            self.dbus_object_path, interface_name, property_name))
1288
 
    
1289
 
    @classmethod
1290
 
    def _get_all_interface_names(cls):
1291
 
        """Get a sequence of all interfaces supported by an object"""
1292
 
        return (name for name in set(getattr(getattr(x, attr),
1293
 
                                             "_dbus_interface", None)
1294
 
                                     for x in (inspect.getmro(cls))
1295
 
                                     for attr in dir(x))
1296
 
                if name is not None)
1297
 
    
1298
 
    @dbus.service.method(dbus.PROPERTIES_IFACE,
1299
 
                         in_signature="ss",
1300
 
                         out_signature="v")
1301
 
    def Get(self, interface_name, property_name):
1302
 
        """Standard D-Bus property Get() method, see D-Bus standard.
1303
 
        """
1304
 
        prop = self._get_dbus_property(interface_name, property_name)
1305
 
        if prop._dbus_access == "write":
1306
 
            raise DBusPropertyAccessException(property_name)
1307
 
        value = prop()
1308
 
        if not hasattr(value, "variant_level"):
1309
 
            return value
1310
 
        return type(value)(value, variant_level=value.variant_level+1)
1311
 
    
1312
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
1313
 
    def Set(self, interface_name, property_name, value):
1314
 
        """Standard D-Bus property Set() method, see D-Bus standard.
1315
 
        """
1316
 
        prop = self._get_dbus_property(interface_name, property_name)
1317
 
        if prop._dbus_access == "read":
1318
 
            raise DBusPropertyAccessException(property_name)
1319
 
        if prop._dbus_get_args_options["byte_arrays"]:
1320
 
            # The byte_arrays option is not supported yet on
1321
 
            # signatures other than "ay".
1322
 
            if prop._dbus_signature != "ay":
1323
 
                raise ValueError("Byte arrays not supported for non-"
1324
 
                                 "'ay' signature {!r}"
1325
 
                                 .format(prop._dbus_signature))
1326
 
            value = dbus.ByteArray(b''.join(chr(byte)
1327
 
                                            for byte in value))
1328
 
        prop(value)
1329
 
    
1330
 
    @dbus.service.method(dbus.PROPERTIES_IFACE,
1331
 
                         in_signature="s",
1332
 
                         out_signature="a{sv}")
1333
 
    def GetAll(self, interface_name):
1334
 
        """Standard D-Bus property GetAll() method, see D-Bus
1335
 
        standard.
1336
 
        
1337
 
        Note: Will not include properties with access="write".
1338
 
        """
1339
 
        properties = {}
1340
 
        for name, prop in self._get_all_dbus_things("property"):
1341
 
            if (interface_name
1342
 
                and interface_name != prop._dbus_interface):
1343
 
                # Interface non-empty but did not match
1344
 
                continue
1345
 
            # Ignore write-only properties
1346
 
            if prop._dbus_access == "write":
1347
 
                continue
1348
 
            value = prop()
1349
 
            if not hasattr(value, "variant_level"):
1350
 
                properties[name] = value
1351
 
                continue
1352
 
            properties[name] = type(value)(
1353
 
                value, variant_level = value.variant_level + 1)
1354
 
        return dbus.Dictionary(properties, signature="sv")
1355
 
    
1356
 
    @dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")
1357
 
    def PropertiesChanged(self, interface_name, changed_properties,
1358
 
                          invalidated_properties):
1359
 
        """Standard D-Bus PropertiesChanged() signal, see D-Bus
1360
 
        standard.
1361
 
        """
1362
 
        pass
1363
 
    
1364
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1365
 
                         out_signature="s",
1366
 
                         path_keyword='object_path',
1367
 
                         connection_keyword='connection')
1368
 
    def Introspect(self, object_path, connection):
1369
 
        """Overloading of standard D-Bus method.
1370
 
        
1371
 
        Inserts property tags and interface annotation tags.
1372
 
        """
1373
 
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
1374
 
                                                         object_path,
1375
 
                                                         connection)
1376
 
        try:
1377
 
            document = xml.dom.minidom.parseString(xmlstring)
1378
 
            
1379
 
            def make_tag(document, name, prop):
1380
 
                e = document.createElement("property")
1381
 
                e.setAttribute("name", name)
1382
 
                e.setAttribute("type", prop._dbus_signature)
1383
 
                e.setAttribute("access", prop._dbus_access)
1384
 
                return e
1385
 
            
1386
 
            for if_tag in document.getElementsByTagName("interface"):
1387
 
                # Add property tags
1388
 
                for tag in (make_tag(document, name, prop)
1389
 
                            for name, prop
1390
 
                            in self._get_all_dbus_things("property")
1391
 
                            if prop._dbus_interface
1392
 
                            == if_tag.getAttribute("name")):
1393
 
                    if_tag.appendChild(tag)
1394
 
                # Add annotation tags for properties
1395
 
                for tag in if_tag.getElementsByTagName("property"):
1396
 
                    annots = dict()
1397
 
                    for name, prop in self._get_all_dbus_things(
1398
 
                            "property"):
1399
 
                        if (name == tag.getAttribute("name")
1400
 
                            and prop._dbus_interface
1401
 
                            == if_tag.getAttribute("name")):
1402
 
                            annots.update(getattr(
1403
 
                                prop, "_dbus_annotations", {}))
1404
 
                    for name, value in annots.items():
1405
 
                        ann_tag = document.createElement(
1406
 
                            "annotation")
1407
 
                        ann_tag.setAttribute("name", name)
1408
 
                        ann_tag.setAttribute("value", value)
1409
 
                        tag.appendChild(ann_tag)
1410
 
                # Add the names to the return values for the
1411
 
                # "org.freedesktop.DBus.Properties" methods
1412
 
                if (if_tag.getAttribute("name")
1413
 
                    == "org.freedesktop.DBus.Properties"):
1414
 
                    for cn in if_tag.getElementsByTagName("method"):
1415
 
                        if cn.getAttribute("name") == "Get":
1416
 
                            for arg in cn.getElementsByTagName("arg"):
1417
 
                                if (arg.getAttribute("direction")
1418
 
                                    == "out"):
1419
 
                                    arg.setAttribute("name", "value")
1420
 
                        elif cn.getAttribute("name") == "GetAll":
1421
 
                            for arg in cn.getElementsByTagName("arg"):
1422
 
                                if (arg.getAttribute("direction")
1423
 
                                    == "out"):
1424
 
                                    arg.setAttribute("name", "props")
1425
 
            xmlstring = document.toxml("utf-8")
1426
 
            document.unlink()
1427
 
        except (AttributeError, xml.dom.DOMException,
1428
 
                xml.parsers.expat.ExpatError) as error:
1429
 
            logger.error("Failed to override Introspection method",
1430
 
                         exc_info=error)
1431
 
        return xmlstring
1432
 
 
1433
 
try:
1434
 
    dbus.OBJECT_MANAGER_IFACE
1435
 
except AttributeError:
1436
 
    dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"
1437
 
 
1438
 
class DBusObjectWithObjectManager(DBusObjectWithAnnotations):
1439
 
    """A D-Bus object with an ObjectManager.
1440
 
    
1441
 
    Classes inheriting from this exposes the standard
1442
 
    GetManagedObjects call and the InterfacesAdded and
1443
 
    InterfacesRemoved signals on the standard
1444
 
    "org.freedesktop.DBus.ObjectManager" interface.
1445
 
    
1446
 
    Note: No signals are sent automatically; they must be sent
1447
 
    manually.
1448
 
    """
1449
 
    @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
1450
 
                         out_signature = "a{oa{sa{sv}}}")
1451
 
    def GetManagedObjects(self):
1452
 
        """This function must be overridden"""
1453
 
        raise NotImplementedError()
1454
 
    
1455
 
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,
1456
 
                         signature = "oa{sa{sv}}")
1457
 
    def InterfacesAdded(self, object_path, interfaces_and_properties):
1458
 
        pass
1459
 
    
1460
 
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature = "oas")
1461
 
    def InterfacesRemoved(self, object_path, interfaces):
1462
 
        pass
1463
 
    
1464
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1465
 
                         out_signature = "s",
1466
 
                         path_keyword = 'object_path',
1467
 
                         connection_keyword = 'connection')
1468
 
    def Introspect(self, object_path, connection):
1469
 
        """Overloading of standard D-Bus method.
1470
 
        
1471
 
        Override return argument name of GetManagedObjects to be
1472
 
        "objpath_interfaces_and_properties"
1473
 
        """
1474
 
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
1475
 
                                                         object_path,
1476
 
                                                         connection)
1477
 
        try:
1478
 
            document = xml.dom.minidom.parseString(xmlstring)
1479
 
            
1480
 
            for if_tag in document.getElementsByTagName("interface"):
1481
 
                # Fix argument name for the GetManagedObjects method
1482
 
                if (if_tag.getAttribute("name")
1483
 
                                == dbus.OBJECT_MANAGER_IFACE):
1484
 
                    for cn in if_tag.getElementsByTagName("method"):
1485
 
                        if (cn.getAttribute("name")
1486
 
                            == "GetManagedObjects"):
1487
 
                            for arg in cn.getElementsByTagName("arg"):
1488
 
                                if (arg.getAttribute("direction")
1489
 
                                    == "out"):
1490
 
                                    arg.setAttribute(
1491
 
                                        "name",
1492
 
                                        "objpath_interfaces"
1493
 
                                        "_and_properties")
1494
 
            xmlstring = document.toxml("utf-8")
1495
 
            document.unlink()
1496
 
        except (AttributeError, xml.dom.DOMException,
1497
 
                xml.parsers.expat.ExpatError) as error:
1498
 
            logger.error("Failed to override Introspection method",
1499
 
                         exc_info = error)
1500
 
        return xmlstring
1501
 
 
1502
 
def datetime_to_dbus(dt, variant_level=0):
1503
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
1504
 
    if dt is None:
1505
 
        return dbus.String("", variant_level = variant_level)
1506
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
1507
 
 
1508
 
 
1509
 
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
1510
 
    """A class decorator; applied to a subclass of
1511
 
    dbus.service.Object, it will add alternate D-Bus attributes with
1512
 
    interface names according to the "alt_interface_names" mapping.
1513
 
    Usage:
1514
 
    
1515
 
    @alternate_dbus_interfaces({"org.example.Interface":
1516
 
                                    "net.example.AlternateInterface"})
1517
 
    class SampleDBusObject(dbus.service.Object):
1518
 
        @dbus.service.method("org.example.Interface")
1519
 
        def SampleDBusMethod():
1520
 
            pass
1521
 
    
1522
 
    The above "SampleDBusMethod" on "SampleDBusObject" will be
1523
 
    reachable via two interfaces: "org.example.Interface" and
1524
 
    "net.example.AlternateInterface", the latter of which will have
1525
 
    its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
1526
 
    "true", unless "deprecate" is passed with a False value.
1527
 
    
1528
 
    This works for methods and signals, and also for D-Bus properties
1529
 
    (from DBusObjectWithProperties) and interfaces (from the
1530
 
    dbus_interface_annotations decorator).
1531
 
    """
1532
 
    
1533
 
    def wrapper(cls):
1534
 
        for orig_interface_name, alt_interface_name in (
1535
 
                alt_interface_names.items()):
1536
 
            attr = {}
1537
 
            interface_names = set()
1538
 
            # Go though all attributes of the class
1539
 
            for attrname, attribute in inspect.getmembers(cls):
1540
 
                # Ignore non-D-Bus attributes, and D-Bus attributes
1541
 
                # with the wrong interface name
1542
 
                if (not hasattr(attribute, "_dbus_interface")
1543
 
                    or not attribute._dbus_interface.startswith(
1544
 
                        orig_interface_name)):
1545
 
                    continue
1546
 
                # Create an alternate D-Bus interface name based on
1547
 
                # the current name
1548
 
                alt_interface = attribute._dbus_interface.replace(
1549
 
                    orig_interface_name, alt_interface_name)
1550
 
                interface_names.add(alt_interface)
1551
 
                # Is this a D-Bus signal?
1552
 
                if getattr(attribute, "_dbus_is_signal", False):
1553
 
                    # Extract the original non-method undecorated
1554
 
                    # function by black magic
1555
 
                    if sys.version_info.major == 2:
1556
 
                        nonmethod_func = (dict(
1557
 
                            zip(attribute.func_code.co_freevars,
1558
 
                                attribute.__closure__))
1559
 
                                          ["func"].cell_contents)
1560
 
                    else:
1561
 
                        nonmethod_func = (dict(
1562
 
                            zip(attribute.__code__.co_freevars,
1563
 
                                attribute.__closure__))
1564
 
                                          ["func"].cell_contents)
1565
 
                    # Create a new, but exactly alike, function
1566
 
                    # object, and decorate it to be a new D-Bus signal
1567
 
                    # with the alternate D-Bus interface name
1568
 
                    new_function = copy_function(nonmethod_func)
1569
 
                    new_function = (dbus.service.signal(
1570
 
                        alt_interface,
1571
 
                        attribute._dbus_signature)(new_function))
1572
 
                    # Copy annotations, if any
1573
 
                    try:
1574
 
                        new_function._dbus_annotations = dict(
1575
 
                            attribute._dbus_annotations)
1576
 
                    except AttributeError:
1577
 
                        pass
1578
 
                    # Define a creator of a function to call both the
1579
 
                    # original and alternate functions, so both the
1580
 
                    # original and alternate signals gets sent when
1581
 
                    # the function is called
1582
 
                    def fixscope(func1, func2):
1583
 
                        """This function is a scope container to pass
1584
 
                        func1 and func2 to the "call_both" function
1585
 
                        outside of its arguments"""
1586
 
                        
1587
 
                        @functools.wraps(func2)
1588
 
                        def call_both(*args, **kwargs):
1589
 
                            """This function will emit two D-Bus
1590
 
                            signals by calling func1 and func2"""
1591
 
                            func1(*args, **kwargs)
1592
 
                            func2(*args, **kwargs)
1593
 
                        # Make wrapper function look like a D-Bus signal
1594
 
                        for name, attr in inspect.getmembers(func2):
1595
 
                            if name.startswith("_dbus_"):
1596
 
                                setattr(call_both, name, attr)
1597
 
                        
1598
 
                        return call_both
1599
 
                    # Create the "call_both" function and add it to
1600
 
                    # the class
1601
 
                    attr[attrname] = fixscope(attribute, new_function)
1602
 
                # Is this a D-Bus method?
1603
 
                elif getattr(attribute, "_dbus_is_method", False):
1604
 
                    # Create a new, but exactly alike, function
1605
 
                    # object.  Decorate it to be a new D-Bus method
1606
 
                    # with the alternate D-Bus interface name.  Add it
1607
 
                    # to the class.
1608
 
                    attr[attrname] = (
1609
 
                        dbus.service.method(
1610
 
                            alt_interface,
1611
 
                            attribute._dbus_in_signature,
1612
 
                            attribute._dbus_out_signature)
1613
 
                        (copy_function(attribute)))
1614
 
                    # Copy annotations, if any
1615
 
                    try:
1616
 
                        attr[attrname]._dbus_annotations = dict(
1617
 
                            attribute._dbus_annotations)
1618
 
                    except AttributeError:
1619
 
                        pass
1620
 
                # Is this a D-Bus property?
1621
 
                elif getattr(attribute, "_dbus_is_property", False):
1622
 
                    # Create a new, but exactly alike, function
1623
 
                    # object, and decorate it to be a new D-Bus
1624
 
                    # property with the alternate D-Bus interface
1625
 
                    # name.  Add it to the class.
1626
 
                    attr[attrname] = (dbus_service_property(
1627
 
                        alt_interface, attribute._dbus_signature,
1628
 
                        attribute._dbus_access,
1629
 
                        attribute._dbus_get_args_options
1630
 
                        ["byte_arrays"])
1631
 
                                      (copy_function(attribute)))
1632
 
                    # Copy annotations, if any
1633
 
                    try:
1634
 
                        attr[attrname]._dbus_annotations = dict(
1635
 
                            attribute._dbus_annotations)
1636
 
                    except AttributeError:
1637
 
                        pass
1638
 
                # Is this a D-Bus interface?
1639
 
                elif getattr(attribute, "_dbus_is_interface", False):
1640
 
                    # Create a new, but exactly alike, function
1641
 
                    # object.  Decorate it to be a new D-Bus interface
1642
 
                    # with the alternate D-Bus interface name.  Add it
1643
 
                    # to the class.
1644
 
                    attr[attrname] = (
1645
 
                        dbus_interface_annotations(alt_interface)
1646
 
                        (copy_function(attribute)))
1647
 
            if deprecate:
1648
 
                # Deprecate all alternate interfaces
1649
 
                iname="_AlternateDBusNames_interface_annotation{}"
1650
 
                for interface_name in interface_names:
1651
 
                    
1652
 
                    @dbus_interface_annotations(interface_name)
1653
 
                    def func(self):
1654
 
                        return { "org.freedesktop.DBus.Deprecated":
1655
 
                                 "true" }
1656
 
                    # Find an unused name
1657
 
                    for aname in (iname.format(i)
1658
 
                                  for i in itertools.count()):
1659
 
                        if aname not in attr:
1660
 
                            attr[aname] = func
1661
 
                            break
1662
 
            if interface_names:
1663
 
                # Replace the class with a new subclass of it with
1664
 
                # methods, signals, etc. as created above.
1665
 
                if sys.version_info.major == 2:
1666
 
                    cls = type(b"{}Alternate".format(cls.__name__),
1667
 
                               (cls, ), attr)
1668
 
                else:
1669
 
                    cls = type("{}Alternate".format(cls.__name__),
1670
 
                               (cls, ), attr)
1671
 
        return cls
1672
 
    
1673
 
    return wrapper
1674
 
 
1675
 
 
1676
 
@alternate_dbus_interfaces({"se.recompile.Mandos":
1677
 
                            "se.bsnet.fukt.Mandos"})
1678
 
class ClientDBus(Client, DBusObjectWithProperties):
1679
 
    """A Client class using D-Bus
1680
 
    
1681
 
    Attributes:
1682
 
    dbus_object_path: dbus.ObjectPath
1683
 
    bus: dbus.SystemBus()
1684
 
    """
1685
 
    
1686
 
    runtime_expansions = (Client.runtime_expansions
1687
 
                          + ("dbus_object_path", ))
1688
 
    
1689
 
    _interface = "se.recompile.Mandos.Client"
1690
 
    
1691
 
    # dbus.service.Object doesn't use super(), so we can't either.
1692
 
    
1693
 
    def __init__(self, bus = None, *args, **kwargs):
1694
 
        self.bus = bus
1695
 
        Client.__init__(self, *args, **kwargs)
1696
 
        # Only now, when this client is initialized, can it show up on
1697
 
        # the D-Bus
1698
 
        client_object_name = str(self.name).translate(
1699
 
            {ord("."): ord("_"),
1700
 
             ord("-"): ord("_")})
1701
 
        self.dbus_object_path = dbus.ObjectPath(
1702
 
            "/clients/" + client_object_name)
1703
 
        DBusObjectWithProperties.__init__(self, self.bus,
1704
 
                                          self.dbus_object_path)
1705
 
    
1706
 
    def notifychangeproperty(transform_func, dbus_name,
1707
 
                             type_func=lambda x: x,
1708
 
                             variant_level=1,
1709
 
                             invalidate_only=False,
1710
 
                             _interface=_interface):
1711
 
        """ Modify a variable so that it's a property which announces
1712
 
        its changes to DBus.
1713
 
        
1714
 
        transform_fun: Function that takes a value and a variant_level
1715
 
                       and transforms it to a D-Bus type.
1716
 
        dbus_name: D-Bus name of the variable
1717
 
        type_func: Function that transform the value before sending it
1718
 
                   to the D-Bus.  Default: no transform
1719
 
        variant_level: D-Bus variant level.  Default: 1
1720
 
        """
1721
 
        attrname = "_{}".format(dbus_name)
1722
 
        
1723
 
        def setter(self, value):
1724
 
            if hasattr(self, "dbus_object_path"):
1725
 
                if (not hasattr(self, attrname) or
1726
 
                    type_func(getattr(self, attrname, None))
1727
 
                    != type_func(value)):
1728
 
                    if invalidate_only:
1729
 
                        self.PropertiesChanged(
1730
 
                            _interface, dbus.Dictionary(),
1731
 
                            dbus.Array((dbus_name, )))
1732
 
                    else:
1733
 
                        dbus_value = transform_func(
1734
 
                            type_func(value),
1735
 
                            variant_level = variant_level)
1736
 
                        self.PropertyChanged(dbus.String(dbus_name),
1737
 
                                             dbus_value)
1738
 
                        self.PropertiesChanged(
1739
 
                            _interface,
1740
 
                            dbus.Dictionary({ dbus.String(dbus_name):
1741
 
                                              dbus_value }),
1742
 
                            dbus.Array())
1743
 
            setattr(self, attrname, value)
1744
 
        
1745
 
        return property(lambda self: getattr(self, attrname), setter)
1746
 
    
1747
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
1748
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
1749
 
                                             "ApprovalPending",
1750
 
                                             type_func = bool)
1751
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1752
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
1753
 
                                        "LastEnabled")
1754
 
    checker = notifychangeproperty(
1755
 
        dbus.Boolean, "CheckerRunning",
1756
 
        type_func = lambda checker: checker is not None)
1757
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
1758
 
                                           "LastCheckedOK")
1759
 
    last_checker_status = notifychangeproperty(dbus.Int16,
1760
 
                                               "LastCheckerStatus")
1761
 
    last_approval_request = notifychangeproperty(
1762
 
        datetime_to_dbus, "LastApprovalRequest")
1763
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
1764
 
                                               "ApprovedByDefault")
1765
 
    approval_delay = notifychangeproperty(
1766
 
        dbus.UInt64, "ApprovalDelay",
1767
 
        type_func = lambda td: td.total_seconds() * 1000)
1768
 
    approval_duration = notifychangeproperty(
1769
 
        dbus.UInt64, "ApprovalDuration",
1770
 
        type_func = lambda td: td.total_seconds() * 1000)
1771
 
    host = notifychangeproperty(dbus.String, "Host")
1772
 
    timeout = notifychangeproperty(
1773
 
        dbus.UInt64, "Timeout",
1774
 
        type_func = lambda td: td.total_seconds() * 1000)
1775
 
    extended_timeout = notifychangeproperty(
1776
 
        dbus.UInt64, "ExtendedTimeout",
1777
 
        type_func = lambda td: td.total_seconds() * 1000)
1778
 
    interval = notifychangeproperty(
1779
 
        dbus.UInt64, "Interval",
1780
 
        type_func = lambda td: td.total_seconds() * 1000)
1781
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
1782
 
    secret = notifychangeproperty(dbus.ByteArray, "Secret",
1783
 
                                  invalidate_only=True)
1784
 
    
1785
 
    del notifychangeproperty
1786
 
    
1787
 
    def __del__(self, *args, **kwargs):
1788
 
        try:
1789
 
            self.remove_from_connection()
1790
 
        except LookupError:
1791
 
            pass
1792
 
        if hasattr(DBusObjectWithProperties, "__del__"):
1793
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
1794
 
        Client.__del__(self, *args, **kwargs)
1795
 
    
1796
 
    def checker_callback(self, source, condition,
1797
 
                         connection, command, *args, **kwargs):
1798
 
        ret = Client.checker_callback(self, source, condition,
1799
 
                                      connection, command, *args,
1800
 
                                      **kwargs)
1801
 
        exitstatus = self.last_checker_status
1802
 
        if exitstatus >= 0:
1803
 
            # Emit D-Bus signal
1804
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
1805
 
                                  # This is specific to GNU libC
1806
 
                                  dbus.Int64(exitstatus << 8),
1807
 
                                  dbus.String(command))
1808
 
        else:
1809
 
            # Emit D-Bus signal
1810
 
            self.CheckerCompleted(dbus.Int16(-1),
1811
 
                                  dbus.Int64(
1812
 
                                      # This is specific to GNU libC
1813
 
                                      (exitstatus << 8)
1814
 
                                      | self.last_checker_signal),
1815
 
                                  dbus.String(command))
1816
 
        return ret
1817
 
    
1818
 
    def start_checker(self, *args, **kwargs):
1819
 
        old_checker_pid = getattr(self.checker, "pid", None)
1820
 
        r = Client.start_checker(self, *args, **kwargs)
1821
 
        # Only if new checker process was started
1822
 
        if (self.checker is not None
1823
 
            and old_checker_pid != self.checker.pid):
1824
 
            # Emit D-Bus signal
1825
 
            self.CheckerStarted(self.current_checker_command)
1826
 
        return r
1827
 
    
1828
 
    def _reset_approved(self):
1829
 
        self.approved = None
1830
 
        return False
1831
 
    
1832
 
    def approve(self, value=True):
1833
 
        self.approved = value
1834
 
        GLib.timeout_add(int(self.approval_duration.total_seconds()
1835
 
                             * 1000), self._reset_approved)
1836
 
        self.send_changedstate()
1837
 
    
1838
 
    ## D-Bus methods, signals & properties
1839
 
    
1840
 
    ## Interfaces
1841
 
    
1842
 
    ## Signals
1843
 
    
1844
 
    # CheckerCompleted - signal
1845
 
    @dbus.service.signal(_interface, signature="nxs")
1846
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
1847
 
        "D-Bus signal"
1848
 
        pass
1849
 
    
1850
 
    # CheckerStarted - signal
1851
 
    @dbus.service.signal(_interface, signature="s")
1852
 
    def CheckerStarted(self, command):
1853
 
        "D-Bus signal"
1854
 
        pass
1855
 
    
1856
 
    # PropertyChanged - signal
1857
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1858
 
    @dbus.service.signal(_interface, signature="sv")
1859
 
    def PropertyChanged(self, property, value):
1860
 
        "D-Bus signal"
1861
 
        pass
1862
 
    
1863
 
    # GotSecret - signal
1864
 
    @dbus.service.signal(_interface)
1865
 
    def GotSecret(self):
1866
 
        """D-Bus signal
1867
 
        Is sent after a successful transfer of secret from the Mandos
1868
 
        server to mandos-client
1869
 
        """
1870
 
        pass
1871
 
    
1872
 
    # Rejected - signal
1873
 
    @dbus.service.signal(_interface, signature="s")
1874
 
    def Rejected(self, reason):
1875
 
        "D-Bus signal"
1876
 
        pass
1877
 
    
1878
 
    # NeedApproval - signal
1879
 
    @dbus.service.signal(_interface, signature="tb")
1880
 
    def NeedApproval(self, timeout, default):
1881
 
        "D-Bus signal"
1882
 
        return self.need_approval()
1883
 
    
1884
 
    ## Methods
1885
 
    
1886
 
    # Approve - method
1887
 
    @dbus.service.method(_interface, in_signature="b")
1888
 
    def Approve(self, value):
1889
 
        self.approve(value)
1890
 
    
1891
 
    # CheckedOK - method
1892
 
    @dbus.service.method(_interface)
1893
 
    def CheckedOK(self):
1894
 
        self.checked_ok()
1895
 
    
1896
 
    # Enable - method
1897
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1898
 
    @dbus.service.method(_interface)
1899
 
    def Enable(self):
1900
 
        "D-Bus method"
1901
 
        self.enable()
1902
 
    
1903
 
    # StartChecker - method
1904
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1905
 
    @dbus.service.method(_interface)
1906
 
    def StartChecker(self):
1907
 
        "D-Bus method"
1908
 
        self.start_checker()
1909
 
    
1910
 
    # Disable - method
1911
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1912
 
    @dbus.service.method(_interface)
1913
 
    def Disable(self):
1914
 
        "D-Bus method"
1915
 
        self.disable()
1916
 
    
1917
 
    # StopChecker - method
1918
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1919
 
    @dbus.service.method(_interface)
1920
 
    def StopChecker(self):
1921
 
        self.stop_checker()
1922
 
    
1923
 
    ## Properties
1924
 
    
1925
 
    # ApprovalPending - property
1926
 
    @dbus_service_property(_interface, signature="b", access="read")
1927
 
    def ApprovalPending_dbus_property(self):
1928
 
        return dbus.Boolean(bool(self.approvals_pending))
1929
 
    
1930
 
    # ApprovedByDefault - property
1931
 
    @dbus_service_property(_interface,
1932
 
                           signature="b",
1933
 
                           access="readwrite")
1934
 
    def ApprovedByDefault_dbus_property(self, value=None):
1935
 
        if value is None:       # get
1936
 
            return dbus.Boolean(self.approved_by_default)
1937
 
        self.approved_by_default = bool(value)
1938
 
    
1939
 
    # ApprovalDelay - property
1940
 
    @dbus_service_property(_interface,
1941
 
                           signature="t",
1942
 
                           access="readwrite")
1943
 
    def ApprovalDelay_dbus_property(self, value=None):
1944
 
        if value is None:       # get
1945
 
            return dbus.UInt64(self.approval_delay.total_seconds()
1946
 
                               * 1000)
1947
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
1948
 
    
1949
 
    # ApprovalDuration - property
1950
 
    @dbus_service_property(_interface,
1951
 
                           signature="t",
1952
 
                           access="readwrite")
1953
 
    def ApprovalDuration_dbus_property(self, value=None):
1954
 
        if value is None:       # get
1955
 
            return dbus.UInt64(self.approval_duration.total_seconds()
1956
 
                               * 1000)
1957
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
1958
 
    
1959
 
    # Name - property
1960
 
    @dbus_annotations(
1961
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
1962
 
    @dbus_service_property(_interface, signature="s", access="read")
1963
 
    def Name_dbus_property(self):
1964
 
        return dbus.String(self.name)
1965
 
    
1966
 
    # Fingerprint - property
1967
 
    @dbus_annotations(
1968
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
1969
 
    @dbus_service_property(_interface, signature="s", access="read")
1970
 
    def Fingerprint_dbus_property(self):
1971
 
        return dbus.String(self.fingerprint)
1972
 
    
1973
 
    # Host - property
1974
 
    @dbus_service_property(_interface,
1975
 
                           signature="s",
1976
 
                           access="readwrite")
1977
 
    def Host_dbus_property(self, value=None):
1978
 
        if value is None:       # get
1979
 
            return dbus.String(self.host)
1980
 
        self.host = str(value)
1981
 
    
1982
 
    # Created - property
1983
 
    @dbus_annotations(
1984
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
1985
 
    @dbus_service_property(_interface, signature="s", access="read")
1986
 
    def Created_dbus_property(self):
1987
 
        return datetime_to_dbus(self.created)
1988
 
    
1989
 
    # LastEnabled - property
1990
 
    @dbus_service_property(_interface, signature="s", access="read")
1991
 
    def LastEnabled_dbus_property(self):
1992
 
        return datetime_to_dbus(self.last_enabled)
1993
 
    
1994
 
    # Enabled - property
1995
 
    @dbus_service_property(_interface,
1996
 
                           signature="b",
1997
 
                           access="readwrite")
1998
 
    def Enabled_dbus_property(self, value=None):
1999
 
        if value is None:       # get
2000
 
            return dbus.Boolean(self.enabled)
2001
 
        if value:
2002
 
            self.enable()
2003
 
        else:
2004
 
            self.disable()
2005
 
    
2006
 
    # LastCheckedOK - property
2007
 
    @dbus_service_property(_interface,
2008
 
                           signature="s",
2009
 
                           access="readwrite")
2010
 
    def LastCheckedOK_dbus_property(self, value=None):
2011
 
        if value is not None:
2012
 
            self.checked_ok()
2013
 
            return
2014
 
        return datetime_to_dbus(self.last_checked_ok)
2015
 
    
2016
 
    # LastCheckerStatus - property
2017
 
    @dbus_service_property(_interface, signature="n", access="read")
2018
 
    def LastCheckerStatus_dbus_property(self):
2019
 
        return dbus.Int16(self.last_checker_status)
2020
 
    
2021
 
    # Expires - property
2022
 
    @dbus_service_property(_interface, signature="s", access="read")
2023
 
    def Expires_dbus_property(self):
2024
 
        return datetime_to_dbus(self.expires)
2025
 
    
2026
 
    # LastApprovalRequest - property
2027
 
    @dbus_service_property(_interface, signature="s", access="read")
2028
 
    def LastApprovalRequest_dbus_property(self):
2029
 
        return datetime_to_dbus(self.last_approval_request)
2030
 
    
2031
 
    # Timeout - property
2032
 
    @dbus_service_property(_interface,
2033
 
                           signature="t",
2034
 
                           access="readwrite")
2035
 
    def Timeout_dbus_property(self, value=None):
2036
 
        if value is None:       # get
2037
 
            return dbus.UInt64(self.timeout.total_seconds() * 1000)
2038
 
        old_timeout = self.timeout
2039
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
2040
 
        # Reschedule disabling
2041
 
        if self.enabled:
2042
 
            now = datetime.datetime.utcnow()
2043
 
            self.expires += self.timeout - old_timeout
2044
 
            if self.expires <= now:
2045
 
                # The timeout has passed
2046
 
                self.disable()
2047
 
            else:
2048
 
                if (getattr(self, "disable_initiator_tag", None)
2049
 
                    is None):
2050
 
                    return
2051
 
                GLib.source_remove(self.disable_initiator_tag)
2052
 
                self.disable_initiator_tag = GLib.timeout_add(
2053
 
                    int((self.expires - now).total_seconds() * 1000),
2054
 
                    self.disable)
2055
 
    
2056
 
    # ExtendedTimeout - property
2057
 
    @dbus_service_property(_interface,
2058
 
                           signature="t",
2059
 
                           access="readwrite")
2060
 
    def ExtendedTimeout_dbus_property(self, value=None):
2061
 
        if value is None:       # get
2062
 
            return dbus.UInt64(self.extended_timeout.total_seconds()
2063
 
                               * 1000)
2064
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
2065
 
    
2066
 
    # Interval - property
2067
 
    @dbus_service_property(_interface,
2068
 
                           signature="t",
2069
 
                           access="readwrite")
2070
 
    def Interval_dbus_property(self, value=None):
2071
 
        if value is None:       # get
2072
 
            return dbus.UInt64(self.interval.total_seconds() * 1000)
2073
 
        self.interval = datetime.timedelta(0, 0, 0, value)
2074
 
        if getattr(self, "checker_initiator_tag", None) is None:
2075
 
            return
2076
 
        if self.enabled:
2077
 
            # Reschedule checker run
2078
 
            GLib.source_remove(self.checker_initiator_tag)
2079
 
            self.checker_initiator_tag = GLib.timeout_add(
2080
 
                value, self.start_checker)
2081
 
            self.start_checker() # Start one now, too
2082
 
    
2083
 
    # Checker - property
2084
 
    @dbus_service_property(_interface,
2085
 
                           signature="s",
2086
 
                           access="readwrite")
2087
 
    def Checker_dbus_property(self, value=None):
2088
 
        if value is None:       # get
2089
 
            return dbus.String(self.checker_command)
2090
 
        self.checker_command = str(value)
2091
 
    
2092
 
    # CheckerRunning - property
2093
 
    @dbus_service_property(_interface,
2094
 
                           signature="b",
2095
 
                           access="readwrite")
2096
 
    def CheckerRunning_dbus_property(self, value=None):
2097
 
        if value is None:       # get
2098
 
            return dbus.Boolean(self.checker is not None)
2099
 
        if value:
2100
 
            self.start_checker()
2101
 
        else:
2102
 
            self.stop_checker()
2103
 
    
2104
 
    # ObjectPath - property
2105
 
    @dbus_annotations(
2106
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",
2107
 
         "org.freedesktop.DBus.Deprecated": "true"})
2108
 
    @dbus_service_property(_interface, signature="o", access="read")
2109
 
    def ObjectPath_dbus_property(self):
2110
 
        return self.dbus_object_path # is already a dbus.ObjectPath
2111
 
    
2112
 
    # Secret = property
2113
 
    @dbus_annotations(
2114
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal":
2115
 
         "invalidates"})
2116
 
    @dbus_service_property(_interface,
2117
 
                           signature="ay",
2118
 
                           access="write",
2119
 
                           byte_arrays=True)
2120
 
    def Secret_dbus_property(self, value):
2121
 
        self.secret = bytes(value)
2122
 
    
2123
 
    del _interface
2124
 
 
2125
 
 
2126
 
class ProxyClient(object):
2127
 
    def __init__(self, child_pipe, fpr, address):
2128
 
        self._pipe = child_pipe
2129
 
        self._pipe.send(('init', fpr, address))
2130
 
        if not self._pipe.recv():
2131
 
            raise KeyError(fpr)
2132
 
    
2133
 
    def __getattribute__(self, name):
2134
 
        if name == '_pipe':
2135
 
            return super(ProxyClient, self).__getattribute__(name)
2136
 
        self._pipe.send(('getattr', name))
2137
 
        data = self._pipe.recv()
2138
 
        if data[0] == 'data':
2139
 
            return data[1]
2140
 
        if data[0] == 'function':
2141
 
            
2142
 
            def func(*args, **kwargs):
2143
 
                self._pipe.send(('funcall', name, args, kwargs))
2144
 
                return self._pipe.recv()[1]
2145
 
            
2146
 
            return func
2147
 
    
2148
 
    def __setattr__(self, name, value):
2149
 
        if name == '_pipe':
2150
 
            return super(ProxyClient, self).__setattr__(name, value)
2151
 
        self._pipe.send(('setattr', name, value))
2152
 
 
2153
 
 
2154
 
class ClientHandler(socketserver.BaseRequestHandler, object):
2155
 
    """A class to handle client connections.
2156
 
    
2157
 
    Instantiated once for each connection to handle it.
 
371
    def still_valid(self):
 
372
        """Has the timeout not yet passed for this client?"""
 
373
        now = datetime.datetime.now()
 
374
        if self.last_checked_ok is None:
 
375
            return now < (self.created + self.timeout)
 
376
        else:
 
377
            return now < (self.last_checked_ok + self.timeout)
 
378
 
 
379
 
 
380
def peer_certificate(session):
 
381
    "Return the peer's OpenPGP certificate as a bytestring"
 
382
    # If not an OpenPGP certificate...
 
383
    if gnutls.library.functions.gnutls_certificate_type_get\
 
384
            (session._c_object) \
 
385
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
386
        # ...do the normal thing
 
387
        return session.peer_certificate
 
388
    list_size = ctypes.c_uint()
 
389
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
390
        (session._c_object, ctypes.byref(list_size))
 
391
    if list_size.value == 0:
 
392
        return None
 
393
    cert = cert_list[0]
 
394
    return ctypes.string_at(cert.data, cert.size)
 
395
 
 
396
 
 
397
def fingerprint(openpgp):
 
398
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
399
    # New empty GnuTLS certificate
 
400
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
401
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
402
        (ctypes.byref(crt))
 
403
    # New GnuTLS "datum" with the OpenPGP public key
 
404
    datum = gnutls.library.types.gnutls_datum_t\
 
405
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
406
                     ctypes.POINTER(ctypes.c_ubyte)),
 
407
         ctypes.c_uint(len(openpgp)))
 
408
    # Import the OpenPGP public key into the certificate
 
409
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
410
        (crt,
 
411
         ctypes.byref(datum),
 
412
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
413
    # New buffer for the fingerprint
 
414
    buffer = ctypes.create_string_buffer(20)
 
415
    buffer_length = ctypes.c_size_t()
 
416
    # Get the fingerprint from the certificate into the buffer
 
417
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
418
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
419
    # Deinit the certificate
 
420
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
421
    # Convert the buffer to a Python bytestring
 
422
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
423
    # Convert the bytestring to hexadecimal notation
 
424
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
425
    return hex_fpr
 
426
 
 
427
 
 
428
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
429
    """A TCP request handler class.
 
430
    Instantiated by IPv6_TCPServer for each request to handle it.
2158
431
    Note: This will run in its own forked process."""
2159
432
    
2160
433
    def handle(self):
2161
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
2162
 
            logger.info("TCP connection from: %s",
2163
 
                        str(self.client_address))
2164
 
            logger.debug("Pipe FD: %d",
2165
 
                         self.server.child_pipe.fileno())
2166
 
            
2167
 
            session = gnutls.ClientSession(self.request)
2168
 
            
2169
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
2170
 
            #                      "+AES-256-CBC", "+SHA1",
2171
 
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
2172
 
            #                      "+DHE-DSS"))
2173
 
            # Use a fallback default, since this MUST be set.
2174
 
            priority = self.server.gnutls_priority
2175
 
            if priority is None:
2176
 
                priority = "NORMAL"
2177
 
            gnutls.priority_set_direct(session._c_object, priority,
2178
 
                                       None)
2179
 
            
2180
 
            # Start communication using the Mandos protocol
2181
 
            # Get protocol number
2182
 
            line = self.request.makefile().readline()
2183
 
            logger.debug("Protocol version: %r", line)
2184
 
            try:
2185
 
                if int(line.strip().split()[0]) > 1:
2186
 
                    raise RuntimeError(line)
2187
 
            except (ValueError, IndexError, RuntimeError) as error:
2188
 
                logger.error("Unknown protocol version: %s", error)
2189
 
                return
2190
 
            
2191
 
            # Start GnuTLS connection
2192
 
            try:
2193
 
                session.handshake()
2194
 
            except gnutls.Error as error:
2195
 
                logger.warning("Handshake failed: %s", error)
2196
 
                # Do not run session.bye() here: the session is not
2197
 
                # established.  Just abandon the request.
2198
 
                return
2199
 
            logger.debug("Handshake succeeded")
2200
 
            
2201
 
            approval_required = False
2202
 
            try:
2203
 
                try:
2204
 
                    fpr = self.fingerprint(
2205
 
                        self.peer_certificate(session))
2206
 
                except (TypeError, gnutls.Error) as error:
2207
 
                    logger.warning("Bad certificate: %s", error)
2208
 
                    return
2209
 
                logger.debug("Fingerprint: %s", fpr)
2210
 
                
2211
 
                try:
2212
 
                    client = ProxyClient(child_pipe, fpr,
2213
 
                                         self.client_address)
2214
 
                except KeyError:
2215
 
                    return
2216
 
                
2217
 
                if client.approval_delay:
2218
 
                    delay = client.approval_delay
2219
 
                    client.approvals_pending += 1
2220
 
                    approval_required = True
2221
 
                
2222
 
                while True:
2223
 
                    if not client.enabled:
2224
 
                        logger.info("Client %s is disabled",
2225
 
                                    client.name)
2226
 
                        if self.server.use_dbus:
2227
 
                            # Emit D-Bus signal
2228
 
                            client.Rejected("Disabled")
2229
 
                        return
2230
 
                    
2231
 
                    if client.approved or not client.approval_delay:
2232
 
                        #We are approved or approval is disabled
2233
 
                        break
2234
 
                    elif client.approved is None:
2235
 
                        logger.info("Client %s needs approval",
2236
 
                                    client.name)
2237
 
                        if self.server.use_dbus:
2238
 
                            # Emit D-Bus signal
2239
 
                            client.NeedApproval(
2240
 
                                client.approval_delay.total_seconds()
2241
 
                                * 1000, client.approved_by_default)
2242
 
                    else:
2243
 
                        logger.warning("Client %s was not approved",
2244
 
                                       client.name)
2245
 
                        if self.server.use_dbus:
2246
 
                            # Emit D-Bus signal
2247
 
                            client.Rejected("Denied")
2248
 
                        return
2249
 
                    
2250
 
                    #wait until timeout or approved
2251
 
                    time = datetime.datetime.now()
2252
 
                    client.changedstate.acquire()
2253
 
                    client.changedstate.wait(delay.total_seconds())
2254
 
                    client.changedstate.release()
2255
 
                    time2 = datetime.datetime.now()
2256
 
                    if (time2 - time) >= delay:
2257
 
                        if not client.approved_by_default:
2258
 
                            logger.warning("Client %s timed out while"
2259
 
                                           " waiting for approval",
2260
 
                                           client.name)
2261
 
                            if self.server.use_dbus:
2262
 
                                # Emit D-Bus signal
2263
 
                                client.Rejected("Approval timed out")
2264
 
                            return
2265
 
                        else:
2266
 
                            break
2267
 
                    else:
2268
 
                        delay -= time2 - time
2269
 
                
2270
 
                try:
2271
 
                    session.send(client.secret)
2272
 
                except gnutls.Error as error:
2273
 
                    logger.warning("gnutls send failed",
2274
 
                                   exc_info = error)
2275
 
                    return
2276
 
                
2277
 
                logger.info("Sending secret to %s", client.name)
2278
 
                # bump the timeout using extended_timeout
2279
 
                client.bump_timeout(client.extended_timeout)
2280
 
                if self.server.use_dbus:
2281
 
                    # Emit D-Bus signal
2282
 
                    client.GotSecret()
2283
 
            
2284
 
            finally:
2285
 
                if approval_required:
2286
 
                    client.approvals_pending -= 1
2287
 
                try:
2288
 
                    session.bye()
2289
 
                except gnutls.Error as error:
2290
 
                    logger.warning("GnuTLS bye failed",
2291
 
                                   exc_info=error)
2292
 
    
2293
 
    @staticmethod
2294
 
    def peer_certificate(session):
2295
 
        "Return the peer's OpenPGP certificate as a bytestring"
2296
 
        # If not an OpenPGP certificate...
2297
 
        if (gnutls.certificate_type_get(session._c_object)
2298
 
            != gnutls.CRT_OPENPGP):
2299
 
            # ...return invalid data
2300
 
            return b""
2301
 
        list_size = ctypes.c_uint(1)
2302
 
        cert_list = (gnutls.certificate_get_peers
2303
 
                     (session._c_object, ctypes.byref(list_size)))
2304
 
        if not bool(cert_list) and list_size.value != 0:
2305
 
            raise gnutls.Error("error getting peer certificate")
2306
 
        if list_size.value == 0:
2307
 
            return None
2308
 
        cert = cert_list[0]
2309
 
        return ctypes.string_at(cert.data, cert.size)
2310
 
    
2311
 
    @staticmethod
2312
 
    def fingerprint(openpgp):
2313
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
2314
 
        # New GnuTLS "datum" with the OpenPGP public key
2315
 
        datum = gnutls.datum_t(
2316
 
            ctypes.cast(ctypes.c_char_p(openpgp),
2317
 
                        ctypes.POINTER(ctypes.c_ubyte)),
2318
 
            ctypes.c_uint(len(openpgp)))
2319
 
        # New empty GnuTLS certificate
2320
 
        crt = gnutls.openpgp_crt_t()
2321
 
        gnutls.openpgp_crt_init(ctypes.byref(crt))
2322
 
        # Import the OpenPGP public key into the certificate
2323
 
        gnutls.openpgp_crt_import(crt, ctypes.byref(datum),
2324
 
                                  gnutls.OPENPGP_FMT_RAW)
2325
 
        # Verify the self signature in the key
2326
 
        crtverify = ctypes.c_uint()
2327
 
        gnutls.openpgp_crt_verify_self(crt, 0,
2328
 
                                       ctypes.byref(crtverify))
2329
 
        if crtverify.value != 0:
2330
 
            gnutls.openpgp_crt_deinit(crt)
2331
 
            raise gnutls.CertificateSecurityError("Verify failed")
2332
 
        # New buffer for the fingerprint
2333
 
        buf = ctypes.create_string_buffer(20)
2334
 
        buf_len = ctypes.c_size_t()
2335
 
        # Get the fingerprint from the certificate into the buffer
2336
 
        gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
2337
 
                                           ctypes.byref(buf_len))
2338
 
        # Deinit the certificate
2339
 
        gnutls.openpgp_crt_deinit(crt)
2340
 
        # Convert the buffer to a Python bytestring
2341
 
        fpr = ctypes.string_at(buf, buf_len.value)
2342
 
        # Convert the bytestring to hexadecimal notation
2343
 
        hex_fpr = binascii.hexlify(fpr).upper()
2344
 
        return hex_fpr
2345
 
 
2346
 
 
2347
 
class MultiprocessingMixIn(object):
2348
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
2349
 
    
2350
 
    def sub_process_main(self, request, address):
2351
 
        try:
2352
 
            self.finish_request(request, address)
2353
 
        except Exception:
2354
 
            self.handle_error(request, address)
2355
 
        self.close_request(request)
2356
 
    
2357
 
    def process_request(self, request, address):
2358
 
        """Start a new process to process the request."""
2359
 
        proc = multiprocessing.Process(target = self.sub_process_main,
2360
 
                                       args = (request, address))
2361
 
        proc.start()
2362
 
        return proc
2363
 
 
2364
 
 
2365
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
2366
 
    """ adds a pipe to the MixIn """
2367
 
    
2368
 
    def process_request(self, request, client_address):
2369
 
        """Overrides and wraps the original process_request().
2370
 
        
2371
 
        This function creates a new pipe in self.pipe
2372
 
        """
2373
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
2374
 
        
2375
 
        proc = MultiprocessingMixIn.process_request(self, request,
2376
 
                                                    client_address)
2377
 
        self.child_pipe.close()
2378
 
        self.add_pipe(parent_pipe, proc)
2379
 
    
2380
 
    def add_pipe(self, parent_pipe, proc):
2381
 
        """Dummy function; override as necessary"""
2382
 
        raise NotImplementedError()
2383
 
 
2384
 
 
2385
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
2386
 
                     socketserver.TCPServer, object):
2387
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
2388
 
    
 
434
        logger.debug(u"TCP connection from: %s",
 
435
                     unicode(self.client_address))
 
436
        session = gnutls.connection.ClientSession\
 
437
                  (self.request, gnutls.connection.X509Credentials())
 
438
        # Note: gnutls.connection.X509Credentials is really a generic
 
439
        # GnuTLS certificate credentials object so long as no X.509
 
440
        # keys are added to it.  Therefore, we can use it here despite
 
441
        # using OpenPGP certificates.
 
442
        
 
443
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
444
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
445
        #                "+DHE-DSS"))
 
446
        priority = "NORMAL"             # Fallback default, since this
 
447
                                        # MUST be set.
 
448
        if self.server.settings["priority"]:
 
449
            priority = self.server.settings["priority"]
 
450
        gnutls.library.functions.gnutls_priority_set_direct\
 
451
            (session._c_object, priority, None);
 
452
        
 
453
        try:
 
454
            session.handshake()
 
455
        except gnutls.errors.GNUTLSError, error:
 
456
            logger.debug(u"Handshake failed: %s", error)
 
457
            # Do not run session.bye() here: the session is not
 
458
            # established.  Just abandon the request.
 
459
            return
 
460
        try:
 
461
            fpr = fingerprint(peer_certificate(session))
 
462
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
463
            logger.debug(u"Bad certificate: %s", error)
 
464
            session.bye()
 
465
            return
 
466
        logger.debug(u"Fingerprint: %s", fpr)
 
467
        client = None
 
468
        for c in self.server.clients:
 
469
            if c.fingerprint == fpr:
 
470
                client = c
 
471
                break
 
472
        if not client:
 
473
            logger.debug(u"Client not found for fingerprint: %s", fpr)
 
474
            session.bye()
 
475
            return
 
476
        # Have to check if client.still_valid(), since it is possible
 
477
        # that the client timed out while establishing the GnuTLS
 
478
        # session.
 
479
        if not client.still_valid():
 
480
            logger.debug(u"Client %(name)s is invalid", vars(client))
 
481
            session.bye()
 
482
            return
 
483
        sent_size = 0
 
484
        while sent_size < len(client.secret):
 
485
            sent = session.send(client.secret[sent_size:])
 
486
            logger.debug(u"Sent: %d, remaining: %d",
 
487
                         sent, len(client.secret)
 
488
                         - (sent_size + sent))
 
489
            sent_size += sent
 
490
        session.bye()
 
491
 
 
492
 
 
493
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
494
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
2389
495
    Attributes:
2390
 
        enabled:        Boolean; whether this server is activated yet
2391
 
        interface:      None or a network interface name (string)
2392
 
        use_ipv6:       Boolean; to use IPv6 or not
 
496
        settings:       Server settings
 
497
        clients:        Set() of Client objects
2393
498
    """
2394
 
    
2395
 
    def __init__(self, server_address, RequestHandlerClass,
2396
 
                 interface=None,
2397
 
                 use_ipv6=True,
2398
 
                 socketfd=None):
2399
 
        """If socketfd is set, use that file descriptor instead of
2400
 
        creating a new one with socket.socket().
2401
 
        """
2402
 
        self.interface = interface
2403
 
        if use_ipv6:
2404
 
            self.address_family = socket.AF_INET6
2405
 
        if socketfd is not None:
2406
 
            # Save the file descriptor
2407
 
            self.socketfd = socketfd
2408
 
            # Save the original socket.socket() function
2409
 
            self.socket_socket = socket.socket
2410
 
            # To implement --socket, we monkey patch socket.socket.
2411
 
            # 
2412
 
            # (When socketserver.TCPServer is a new-style class, we
2413
 
            # could make self.socket into a property instead of monkey
2414
 
            # patching socket.socket.)
2415
 
            # 
2416
 
            # Create a one-time-only replacement for socket.socket()
2417
 
            @functools.wraps(socket.socket)
2418
 
            def socket_wrapper(*args, **kwargs):
2419
 
                # Restore original function so subsequent calls are
2420
 
                # not affected.
2421
 
                socket.socket = self.socket_socket
2422
 
                del self.socket_socket
2423
 
                # This time only, return a new socket object from the
2424
 
                # saved file descriptor.
2425
 
                return socket.fromfd(self.socketfd, *args, **kwargs)
2426
 
            # Replace socket.socket() function with wrapper
2427
 
            socket.socket = socket_wrapper
2428
 
        # The socketserver.TCPServer.__init__ will call
2429
 
        # socket.socket(), which might be our replacement,
2430
 
        # socket_wrapper(), if socketfd was set.
2431
 
        socketserver.TCPServer.__init__(self, server_address,
2432
 
                                        RequestHandlerClass)
2433
 
    
 
499
    address_family = socket.AF_INET6
 
500
    def __init__(self, *args, **kwargs):
 
501
        if "settings" in kwargs:
 
502
            self.settings = kwargs["settings"]
 
503
            del kwargs["settings"]
 
504
        if "clients" in kwargs:
 
505
            self.clients = kwargs["clients"]
 
506
            del kwargs["clients"]
 
507
        return super(type(self), self).__init__(*args, **kwargs)
2434
508
    def server_bind(self):
2435
509
        """This overrides the normal server_bind() function
2436
510
        to bind to an interface if one was specified, and also NOT to
2437
511
        bind to an address or port if they were not specified."""
2438
 
        if self.interface is not None:
2439
 
            if SO_BINDTODEVICE is None:
2440
 
                logger.error("SO_BINDTODEVICE does not exist;"
2441
 
                             " cannot bind to interface %s",
2442
 
                             self.interface)
2443
 
            else:
2444
 
                try:
2445
 
                    self.socket.setsockopt(
2446
 
                        socket.SOL_SOCKET, SO_BINDTODEVICE,
2447
 
                        (self.interface + "\0").encode("utf-8"))
2448
 
                except socket.error as error:
2449
 
                    if error.errno == errno.EPERM:
2450
 
                        logger.error("No permission to bind to"
2451
 
                                     " interface %s", self.interface)
2452
 
                    elif error.errno == errno.ENOPROTOOPT:
2453
 
                        logger.error("SO_BINDTODEVICE not available;"
2454
 
                                     " cannot bind to interface %s",
2455
 
                                     self.interface)
2456
 
                    elif error.errno == errno.ENODEV:
2457
 
                        logger.error("Interface %s does not exist,"
2458
 
                                     " cannot bind", self.interface)
2459
 
                    else:
2460
 
                        raise
 
512
        if self.settings["interface"] != avahi.IF_UNSPEC:
 
513
            # 25 is from /usr/include/asm-i486/socket.h
 
514
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
515
            try:
 
516
                self.socket.setsockopt(socket.SOL_SOCKET,
 
517
                                       SO_BINDTODEVICE,
 
518
                                       self.settings["interface"])
 
519
            except socket.error, error:
 
520
                if error[0] == errno.EPERM:
 
521
                    logger.warning(u"No permission to"
 
522
                                   u" bind to interface %s",
 
523
                                   self.settings["interface"])
 
524
                else:
 
525
                    raise error
2461
526
        # Only bind(2) the socket if we really need to.
2462
527
        if self.server_address[0] or self.server_address[1]:
2463
528
            if not self.server_address[0]:
2464
 
                if self.address_family == socket.AF_INET6:
2465
 
                    any_address = "::" # in6addr_any
2466
 
                else:
2467
 
                    any_address = "0.0.0.0" # INADDR_ANY
2468
 
                self.server_address = (any_address,
 
529
                in6addr_any = "::"
 
530
                self.server_address = (in6addr_any,
2469
531
                                       self.server_address[1])
2470
 
            elif not self.server_address[1]:
2471
 
                self.server_address = (self.server_address[0], 0)
2472
 
#                 if self.interface:
2473
 
#                     self.server_address = (self.server_address[0],
2474
 
#                                            0, # port
2475
 
#                                            0, # flowinfo
2476
 
#                                            if_nametoindex
2477
 
#                                            (self.interface))
2478
 
            return socketserver.TCPServer.server_bind(self)
2479
 
 
2480
 
 
2481
 
class MandosServer(IPv6_TCPServer):
2482
 
    """Mandos server.
2483
 
    
2484
 
    Attributes:
2485
 
        clients:        set of Client objects
2486
 
        gnutls_priority GnuTLS priority string
2487
 
        use_dbus:       Boolean; to emit D-Bus signals or not
2488
 
    
2489
 
    Assumes a GLib.MainLoop event loop.
2490
 
    """
2491
 
    
2492
 
    def __init__(self, server_address, RequestHandlerClass,
2493
 
                 interface=None,
2494
 
                 use_ipv6=True,
2495
 
                 clients=None,
2496
 
                 gnutls_priority=None,
2497
 
                 use_dbus=True,
2498
 
                 socketfd=None):
2499
 
        self.enabled = False
2500
 
        self.clients = clients
2501
 
        if self.clients is None:
2502
 
            self.clients = {}
2503
 
        self.use_dbus = use_dbus
2504
 
        self.gnutls_priority = gnutls_priority
2505
 
        IPv6_TCPServer.__init__(self, server_address,
2506
 
                                RequestHandlerClass,
2507
 
                                interface = interface,
2508
 
                                use_ipv6 = use_ipv6,
2509
 
                                socketfd = socketfd)
2510
 
    
2511
 
    def server_activate(self):
2512
 
        if self.enabled:
2513
 
            return socketserver.TCPServer.server_activate(self)
2514
 
    
2515
 
    def enable(self):
2516
 
        self.enabled = True
2517
 
    
2518
 
    def add_pipe(self, parent_pipe, proc):
2519
 
        # Call "handle_ipc" for both data and EOF events
2520
 
        GLib.io_add_watch(
2521
 
            parent_pipe.fileno(),
2522
 
            GLib.IO_IN | GLib.IO_HUP,
2523
 
            functools.partial(self.handle_ipc,
2524
 
                              parent_pipe = parent_pipe,
2525
 
                              proc = proc))
2526
 
    
2527
 
    def handle_ipc(self, source, condition,
2528
 
                   parent_pipe=None,
2529
 
                   proc = None,
2530
 
                   client_object=None):
2531
 
        # error, or the other end of multiprocessing.Pipe has closed
2532
 
        if condition & (GLib.IO_ERR | GLib.IO_HUP):
2533
 
            # Wait for other process to exit
2534
 
            proc.join()
2535
 
            return False
2536
 
        
2537
 
        # Read a request from the child
2538
 
        request = parent_pipe.recv()
2539
 
        command = request[0]
2540
 
        
2541
 
        if command == 'init':
2542
 
            fpr = request[1]
2543
 
            address = request[2]
2544
 
            
2545
 
            for c in self.clients.values():
2546
 
                if c.fingerprint == fpr:
2547
 
                    client = c
2548
 
                    break
2549
 
            else:
2550
 
                logger.info("Client not found for fingerprint: %s, ad"
2551
 
                            "dress: %s", fpr, address)
2552
 
                if self.use_dbus:
2553
 
                    # Emit D-Bus signal
2554
 
                    mandos_dbus_service.ClientNotFound(fpr,
2555
 
                                                       address[0])
2556
 
                parent_pipe.send(False)
2557
 
                return False
2558
 
            
2559
 
            GLib.io_add_watch(
2560
 
                parent_pipe.fileno(),
2561
 
                GLib.IO_IN | GLib.IO_HUP,
2562
 
                functools.partial(self.handle_ipc,
2563
 
                                  parent_pipe = parent_pipe,
2564
 
                                  proc = proc,
2565
 
                                  client_object = client))
2566
 
            parent_pipe.send(True)
2567
 
            # remove the old hook in favor of the new above hook on
2568
 
            # same fileno
2569
 
            return False
2570
 
        if command == 'funcall':
2571
 
            funcname = request[1]
2572
 
            args = request[2]
2573
 
            kwargs = request[3]
2574
 
            
2575
 
            parent_pipe.send(('data', getattr(client_object,
2576
 
                                              funcname)(*args,
2577
 
                                                        **kwargs)))
2578
 
        
2579
 
        if command == 'getattr':
2580
 
            attrname = request[1]
2581
 
            if isinstance(client_object.__getattribute__(attrname),
2582
 
                          collections.Callable):
2583
 
                parent_pipe.send(('function', ))
2584
 
            else:
2585
 
                parent_pipe.send((
2586
 
                    'data', client_object.__getattribute__(attrname)))
2587
 
        
2588
 
        if command == 'setattr':
2589
 
            attrname = request[1]
2590
 
            value = request[2]
2591
 
            setattr(client_object, attrname, value)
2592
 
        
2593
 
        return True
2594
 
 
2595
 
 
2596
 
def rfc3339_duration_to_delta(duration):
2597
 
    """Parse an RFC 3339 "duration" and return a datetime.timedelta
2598
 
    
2599
 
    >>> rfc3339_duration_to_delta("P7D")
2600
 
    datetime.timedelta(7)
2601
 
    >>> rfc3339_duration_to_delta("PT60S")
2602
 
    datetime.timedelta(0, 60)
2603
 
    >>> rfc3339_duration_to_delta("PT60M")
2604
 
    datetime.timedelta(0, 3600)
2605
 
    >>> rfc3339_duration_to_delta("PT24H")
2606
 
    datetime.timedelta(1)
2607
 
    >>> rfc3339_duration_to_delta("P1W")
2608
 
    datetime.timedelta(7)
2609
 
    >>> rfc3339_duration_to_delta("PT5M30S")
2610
 
    datetime.timedelta(0, 330)
2611
 
    >>> rfc3339_duration_to_delta("P1DT3M20S")
2612
 
    datetime.timedelta(1, 200)
2613
 
    """
2614
 
    
2615
 
    # Parsing an RFC 3339 duration with regular expressions is not
2616
 
    # possible - there would have to be multiple places for the same
2617
 
    # values, like seconds.  The current code, while more esoteric, is
2618
 
    # cleaner without depending on a parsing library.  If Python had a
2619
 
    # built-in library for parsing we would use it, but we'd like to
2620
 
    # avoid excessive use of external libraries.
2621
 
    
2622
 
    # New type for defining tokens, syntax, and semantics all-in-one
2623
 
    Token = collections.namedtuple("Token", (
2624
 
        "regexp",  # To match token; if "value" is not None, must have
2625
 
                   # a "group" containing digits
2626
 
        "value",   # datetime.timedelta or None
2627
 
        "followers"))           # Tokens valid after this token
2628
 
    # RFC 3339 "duration" tokens, syntax, and semantics; taken from
2629
 
    # the "duration" ABNF definition in RFC 3339, Appendix A.
2630
 
    token_end = Token(re.compile(r"$"), None, frozenset())
2631
 
    token_second = Token(re.compile(r"(\d+)S"),
2632
 
                         datetime.timedelta(seconds=1),
2633
 
                         frozenset((token_end, )))
2634
 
    token_minute = Token(re.compile(r"(\d+)M"),
2635
 
                         datetime.timedelta(minutes=1),
2636
 
                         frozenset((token_second, token_end)))
2637
 
    token_hour = Token(re.compile(r"(\d+)H"),
2638
 
                       datetime.timedelta(hours=1),
2639
 
                       frozenset((token_minute, token_end)))
2640
 
    token_time = Token(re.compile(r"T"),
2641
 
                       None,
2642
 
                       frozenset((token_hour, token_minute,
2643
 
                                  token_second)))
2644
 
    token_day = Token(re.compile(r"(\d+)D"),
2645
 
                      datetime.timedelta(days=1),
2646
 
                      frozenset((token_time, token_end)))
2647
 
    token_month = Token(re.compile(r"(\d+)M"),
2648
 
                        datetime.timedelta(weeks=4),
2649
 
                        frozenset((token_day, token_end)))
2650
 
    token_year = Token(re.compile(r"(\d+)Y"),
2651
 
                       datetime.timedelta(weeks=52),
2652
 
                       frozenset((token_month, token_end)))
2653
 
    token_week = Token(re.compile(r"(\d+)W"),
2654
 
                       datetime.timedelta(weeks=1),
2655
 
                       frozenset((token_end, )))
2656
 
    token_duration = Token(re.compile(r"P"), None,
2657
 
                           frozenset((token_year, token_month,
2658
 
                                      token_day, token_time,
2659
 
                                      token_week)))
2660
 
    # Define starting values
2661
 
    value = datetime.timedelta() # Value so far
2662
 
    found_token = None
2663
 
    followers = frozenset((token_duration, )) # Following valid tokens
2664
 
    s = duration                # String left to parse
2665
 
    # Loop until end token is found
2666
 
    while found_token is not token_end:
2667
 
        # Search for any currently valid tokens
2668
 
        for token in followers:
2669
 
            match = token.regexp.match(s)
2670
 
            if match is not None:
2671
 
                # Token found
2672
 
                if token.value is not None:
2673
 
                    # Value found, parse digits
2674
 
                    factor = int(match.group(1), 10)
2675
 
                    # Add to value so far
2676
 
                    value += factor * token.value
2677
 
                # Strip token from string
2678
 
                s = token.regexp.sub("", s, 1)
2679
 
                # Go to found token
2680
 
                found_token = token
2681
 
                # Set valid next tokens
2682
 
                followers = found_token.followers
2683
 
                break
2684
 
        else:
2685
 
            # No currently valid tokens were found
2686
 
            raise ValueError("Invalid RFC 3339 duration: {!r}"
2687
 
                             .format(duration))
2688
 
    # End token found
2689
 
    return value
 
532
            elif self.server_address[1] is None:
 
533
                self.server_address = (self.server_address[0],
 
534
                                       0)
 
535
            return super(type(self), self).server_bind()
2690
536
 
2691
537
 
2692
538
def string_to_delta(interval):
2693
539
    """Parse a string and return a datetime.timedelta
2694
 
    
 
540
 
2695
541
    >>> string_to_delta('7d')
2696
542
    datetime.timedelta(7)
2697
543
    >>> string_to_delta('60s')
2700
546
    datetime.timedelta(0, 3600)
2701
547
    >>> string_to_delta('24h')
2702
548
    datetime.timedelta(1)
2703
 
    >>> string_to_delta('1w')
 
549
    >>> string_to_delta(u'1w')
2704
550
    datetime.timedelta(7)
2705
 
    >>> string_to_delta('5m 30s')
2706
 
    datetime.timedelta(0, 330)
2707
551
    """
2708
 
    
2709
 
    try:
2710
 
        return rfc3339_duration_to_delta(interval)
2711
 
    except ValueError:
2712
 
        pass
2713
 
    
2714
 
    timevalue = datetime.timedelta(0)
2715
 
    for s in interval.split():
2716
 
        try:
2717
 
            suffix = s[-1]
2718
 
            value = int(s[:-1])
2719
 
            if suffix == "d":
2720
 
                delta = datetime.timedelta(value)
2721
 
            elif suffix == "s":
2722
 
                delta = datetime.timedelta(0, value)
2723
 
            elif suffix == "m":
2724
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
2725
 
            elif suffix == "h":
2726
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
2727
 
            elif suffix == "w":
2728
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
2729
 
            else:
2730
 
                raise ValueError("Unknown suffix {!r}".format(suffix))
2731
 
        except IndexError as e:
2732
 
            raise ValueError(*(e.args))
2733
 
        timevalue += delta
2734
 
    return timevalue
2735
 
 
2736
 
 
2737
 
def daemon(nochdir = False, noclose = False):
 
552
    try:
 
553
        suffix=unicode(interval[-1])
 
554
        value=int(interval[:-1])
 
555
        if suffix == u"d":
 
556
            delta = datetime.timedelta(value)
 
557
        elif suffix == u"s":
 
558
            delta = datetime.timedelta(0, value)
 
559
        elif suffix == u"m":
 
560
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
561
        elif suffix == u"h":
 
562
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
563
        elif suffix == u"w":
 
564
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
565
        else:
 
566
            raise ValueError
 
567
    except (ValueError, IndexError):
 
568
        raise ValueError
 
569
    return delta
 
570
 
 
571
 
 
572
def server_state_changed(state):
 
573
    """Derived from the Avahi example code"""
 
574
    if state == avahi.SERVER_COLLISION:
 
575
        logger.warning(u"Server name collision")
 
576
        service.remove()
 
577
    elif state == avahi.SERVER_RUNNING:
 
578
        service.add()
 
579
 
 
580
 
 
581
def entry_group_state_changed(state, error):
 
582
    """Derived from the Avahi example code"""
 
583
    logger.debug(u"state change: %i", state)
 
584
    
 
585
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
586
        logger.debug(u"Service established.")
 
587
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
588
        logger.warning(u"Service name collision.")
 
589
        service.rename()
 
590
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
591
        logger.critical(u"Error in group state changed %s",
 
592
                        unicode(error))
 
593
        raise AvahiGroupError("State changed: %s", str(error))
 
594
 
 
595
def if_nametoindex(interface, _func=[None]):
 
596
    """Call the C function if_nametoindex(), or equivalent"""
 
597
    if _func[0] is not None:
 
598
        return _func[0](interface)
 
599
    try:
 
600
        if "ctypes.util" not in sys.modules:
 
601
            import ctypes.util
 
602
        while True:
 
603
            try:
 
604
                libc = ctypes.cdll.LoadLibrary\
 
605
                       (ctypes.util.find_library("c"))
 
606
                func[0] = libc.if_nametoindex
 
607
                return _func[0](interface)
 
608
            except IOError, e:
 
609
                if e != errno.EINTR:
 
610
                    raise
 
611
    except (OSError, AttributeError):
 
612
        if "struct" not in sys.modules:
 
613
            import struct
 
614
        if "fcntl" not in sys.modules:
 
615
            import fcntl
 
616
        def the_hard_way(interface):
 
617
            "Get an interface index the hard way, i.e. using fcntl()"
 
618
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
619
            s = socket.socket()
 
620
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
621
                                struct.pack("16s16x", interface))
 
622
            s.close()
 
623
            interface_index = struct.unpack("I", ifreq[16:20])[0]
 
624
            return interface_index
 
625
        _func[0] = the_hard_way
 
626
        return _func[0](interface)
 
627
 
 
628
 
 
629
def daemon(nochdir, noclose):
2738
630
    """See daemon(3).  Standard BSD Unix function.
2739
 
    
2740
631
    This should really exist as os.daemon, but it doesn't (yet)."""
2741
632
    if os.fork():
2742
633
        sys.exit()
2743
634
    os.setsid()
2744
635
    if not nochdir:
2745
636
        os.chdir("/")
2746
 
    if os.fork():
2747
 
        sys.exit()
2748
637
    if not noclose:
2749
638
        # Close all standard open file descriptors
2750
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
 
639
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
2751
640
        if not stat.S_ISCHR(os.fstat(null).st_mode):
2752
641
            raise OSError(errno.ENODEV,
2753
 
                          "{} not a character device"
2754
 
                          .format(os.devnull))
 
642
                          "/dev/null not a character device")
2755
643
        os.dup2(null, sys.stdin.fileno())
2756
644
        os.dup2(null, sys.stdout.fileno())
2757
645
        os.dup2(null, sys.stderr.fileno())
2760
648
 
2761
649
 
2762
650
def main():
2763
 
    
2764
 
    ##################################################################
2765
 
    # Parsing of options, both command line and config file
2766
 
    
2767
 
    parser = argparse.ArgumentParser()
2768
 
    parser.add_argument("-v", "--version", action="version",
2769
 
                        version = "%(prog)s {}".format(version),
2770
 
                        help="show version number and exit")
2771
 
    parser.add_argument("-i", "--interface", metavar="IF",
2772
 
                        help="Bind to interface IF")
2773
 
    parser.add_argument("-a", "--address",
2774
 
                        help="Address to listen for requests on")
2775
 
    parser.add_argument("-p", "--port", type=int,
2776
 
                        help="Port number to receive requests on")
2777
 
    parser.add_argument("--check", action="store_true",
2778
 
                        help="Run self-test")
2779
 
    parser.add_argument("--debug", action="store_true",
2780
 
                        help="Debug mode; run in foreground and log"
2781
 
                        " to terminal", default=None)
2782
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
2783
 
                        help="Debug level for stdout output")
2784
 
    parser.add_argument("--priority", help="GnuTLS"
2785
 
                        " priority string (see GnuTLS documentation)")
2786
 
    parser.add_argument("--servicename",
2787
 
                        metavar="NAME", help="Zeroconf service name")
2788
 
    parser.add_argument("--configdir",
2789
 
                        default="/etc/mandos", metavar="DIR",
2790
 
                        help="Directory to search for configuration"
2791
 
                        " files")
2792
 
    parser.add_argument("--no-dbus", action="store_false",
2793
 
                        dest="use_dbus", help="Do not provide D-Bus"
2794
 
                        " system bus interface", default=None)
2795
 
    parser.add_argument("--no-ipv6", action="store_false",
2796
 
                        dest="use_ipv6", help="Do not use IPv6",
2797
 
                        default=None)
2798
 
    parser.add_argument("--no-restore", action="store_false",
2799
 
                        dest="restore", help="Do not restore stored"
2800
 
                        " state", default=None)
2801
 
    parser.add_argument("--socket", type=int,
2802
 
                        help="Specify a file descriptor to a network"
2803
 
                        " socket to use instead of creating one")
2804
 
    parser.add_argument("--statedir", metavar="DIR",
2805
 
                        help="Directory to save/restore state in")
2806
 
    parser.add_argument("--foreground", action="store_true",
2807
 
                        help="Run in foreground", default=None)
2808
 
    parser.add_argument("--no-zeroconf", action="store_false",
2809
 
                        dest="zeroconf", help="Do not use Zeroconf",
2810
 
                        default=None)
2811
 
    
2812
 
    options = parser.parse_args()
 
651
    global main_loop_started
 
652
    main_loop_started = False
 
653
    
 
654
    parser = OptionParser()
 
655
    parser.add_option("-i", "--interface", type="string",
 
656
                      metavar="IF", help="Bind to interface IF")
 
657
    parser.add_option("-a", "--address", type="string",
 
658
                      help="Address to listen for requests on")
 
659
    parser.add_option("-p", "--port", type="int",
 
660
                      help="Port number to receive requests on")
 
661
    parser.add_option("--check", action="store_true", default=False,
 
662
                      help="Run self-test")
 
663
    parser.add_option("--debug", action="store_true", default=False,
 
664
                      help="Debug mode; run in foreground and log to"
 
665
                      " terminal")
 
666
    parser.add_option("--priority", type="string", help="GnuTLS"
 
667
                      " priority string (see GnuTLS documentation)")
 
668
    parser.add_option("--servicename", type="string", metavar="NAME",
 
669
                      help="Zeroconf service name")
 
670
    parser.add_option("--configdir", type="string",
 
671
                      default="/etc/mandos", metavar="DIR",
 
672
                      help="Directory to search for configuration"
 
673
                      " files")
 
674
    (options, args) = parser.parse_args()
2813
675
    
2814
676
    if options.check:
2815
677
        import doctest
2816
 
        fail_count, test_count = doctest.testmod()
2817
 
        sys.exit(os.EX_OK if fail_count == 0 else 1)
 
678
        doctest.testmod()
 
679
        sys.exit()
2818
680
    
2819
681
    # Default values for config file for server-global settings
2820
682
    server_defaults = { "interface": "",
2822
684
                        "port": "",
2823
685
                        "debug": "False",
2824
686
                        "priority":
2825
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"
2826
 
                        ":+SIGN-DSA-SHA256",
 
687
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
2827
688
                        "servicename": "Mandos",
2828
 
                        "use_dbus": "True",
2829
 
                        "use_ipv6": "True",
2830
 
                        "debuglevel": "",
2831
 
                        "restore": "True",
2832
 
                        "socket": "",
2833
 
                        "statedir": "/var/lib/mandos",
2834
 
                        "foreground": "False",
2835
 
                        "zeroconf": "True",
2836
 
                    }
 
689
                        }
2837
690
    
2838
691
    # Parse config file for server-global settings
2839
 
    server_config = configparser.SafeConfigParser(server_defaults)
 
692
    server_config = ConfigParser.SafeConfigParser(server_defaults)
2840
693
    del server_defaults
2841
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
694
    server_config.read(os.path.join(options.configdir, "server.conf"))
 
695
    server_section = "server"
2842
696
    # Convert the SafeConfigParser object to a dict
2843
 
    server_settings = server_config.defaults()
2844
 
    # Use the appropriate methods on the non-string config options
2845
 
    for option in ("debug", "use_dbus", "use_ipv6", "foreground"):
2846
 
        server_settings[option] = server_config.getboolean("DEFAULT",
2847
 
                                                           option)
2848
 
    if server_settings["port"]:
2849
 
        server_settings["port"] = server_config.getint("DEFAULT",
2850
 
                                                       "port")
2851
 
    if server_settings["socket"]:
2852
 
        server_settings["socket"] = server_config.getint("DEFAULT",
2853
 
                                                         "socket")
2854
 
        # Later, stdin will, and stdout and stderr might, be dup'ed
2855
 
        # over with an opened os.devnull.  But we don't want this to
2856
 
        # happen with a supplied network socket.
2857
 
        if 0 <= server_settings["socket"] <= 2:
2858
 
            server_settings["socket"] = os.dup(server_settings
2859
 
                                               ["socket"])
 
697
    server_settings = dict(server_config.items(server_section))
 
698
    # Use getboolean on the boolean config option
 
699
    server_settings["debug"] = server_config.getboolean\
 
700
                               (server_section, "debug")
2860
701
    del server_config
 
702
    if not server_settings["interface"]:
 
703
        server_settings["interface"] = avahi.IF_UNSPEC
2861
704
    
2862
705
    # Override the settings from the config file with command line
2863
706
    # options, if set.
2864
707
    for option in ("interface", "address", "port", "debug",
2865
 
                   "priority", "servicename", "configdir", "use_dbus",
2866
 
                   "use_ipv6", "debuglevel", "restore", "statedir",
2867
 
                   "socket", "foreground", "zeroconf"):
 
708
                   "priority", "servicename", "configdir"):
2868
709
        value = getattr(options, option)
2869
710
        if value is not None:
2870
711
            server_settings[option] = value
2871
712
    del options
2872
 
    # Force all strings to be unicode
2873
 
    for option in server_settings.keys():
2874
 
        if isinstance(server_settings[option], bytes):
2875
 
            server_settings[option] = (server_settings[option]
2876
 
                                       .decode("utf-8"))
2877
 
    # Force all boolean options to be boolean
2878
 
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
2879
 
                   "foreground", "zeroconf"):
2880
 
        server_settings[option] = bool(server_settings[option])
2881
 
    # Debug implies foreground
2882
 
    if server_settings["debug"]:
2883
 
        server_settings["foreground"] = True
2884
713
    # Now we have our good server settings in "server_settings"
2885
714
    
2886
 
    ##################################################################
2887
 
    
2888
 
    if (not server_settings["zeroconf"]
2889
 
        and not (server_settings["port"]
2890
 
                 or server_settings["socket"] != "")):
2891
 
        parser.error("Needs port or socket to work without Zeroconf")
2892
 
    
2893
 
    # For convenience
2894
 
    debug = server_settings["debug"]
2895
 
    debuglevel = server_settings["debuglevel"]
2896
 
    use_dbus = server_settings["use_dbus"]
2897
 
    use_ipv6 = server_settings["use_ipv6"]
2898
 
    stored_state_path = os.path.join(server_settings["statedir"],
2899
 
                                     stored_state_file)
2900
 
    foreground = server_settings["foreground"]
2901
 
    zeroconf = server_settings["zeroconf"]
2902
 
    
2903
 
    if debug:
2904
 
        initlogger(debug, logging.DEBUG)
2905
 
    else:
2906
 
        if not debuglevel:
2907
 
            initlogger(debug)
2908
 
        else:
2909
 
            level = getattr(logging, debuglevel.upper())
2910
 
            initlogger(debug, level)
2911
 
    
2912
 
    if server_settings["servicename"] != "Mandos":
2913
 
        syslogger.setFormatter(
2914
 
            logging.Formatter('Mandos ({}) [%(process)d]:'
2915
 
                              ' %(levelname)s: %(message)s'.format(
2916
 
                                  server_settings["servicename"])))
2917
 
    
2918
715
    # Parse config file with clients
2919
 
    client_config = configparser.SafeConfigParser(Client
2920
 
                                                  .client_defaults)
 
716
    client_defaults = { "timeout": "1h",
 
717
                        "interval": "5m",
 
718
                        "checker": "fping -q -- %%(fqdn)s",
 
719
                        }
 
720
    client_config = ConfigParser.SafeConfigParser(client_defaults)
2921
721
    client_config.read(os.path.join(server_settings["configdir"],
2922
722
                                    "clients.conf"))
2923
723
    
2924
 
    global mandos_dbus_service
2925
 
    mandos_dbus_service = None
2926
 
    
2927
 
    socketfd = None
2928
 
    if server_settings["socket"] != "":
2929
 
        socketfd = server_settings["socket"]
2930
 
    tcp_server = MandosServer(
2931
 
        (server_settings["address"], server_settings["port"]),
2932
 
        ClientHandler,
2933
 
        interface=(server_settings["interface"] or None),
2934
 
        use_ipv6=use_ipv6,
2935
 
        gnutls_priority=server_settings["priority"],
2936
 
        use_dbus=use_dbus,
2937
 
        socketfd=socketfd)
2938
 
    if not foreground:
2939
 
        pidfilename = "/run/mandos.pid"
2940
 
        if not os.path.isdir("/run/."):
2941
 
            pidfilename = "/var/run/mandos.pid"
2942
 
        pidfile = None
2943
 
        try:
2944
 
            pidfile = codecs.open(pidfilename, "w", encoding="utf-8")
2945
 
        except IOError as e:
2946
 
            logger.error("Could not open file %r", pidfilename,
2947
 
                         exc_info=e)
2948
 
    
2949
 
    for name, group in (("_mandos", "_mandos"),
2950
 
                        ("mandos", "mandos"),
2951
 
                        ("nobody", "nogroup")):
2952
 
        try:
2953
 
            uid = pwd.getpwnam(name).pw_uid
2954
 
            gid = pwd.getpwnam(group).pw_gid
2955
 
            break
2956
 
        except KeyError:
2957
 
            continue
2958
 
    else:
2959
 
        uid = 65534
2960
 
        gid = 65534
2961
 
    try:
2962
 
        os.setgid(gid)
2963
 
        os.setuid(uid)
2964
 
        if debug:
2965
 
            logger.debug("Did setuid/setgid to {}:{}".format(uid,
2966
 
                                                             gid))
2967
 
    except OSError as error:
2968
 
        logger.warning("Failed to setuid/setgid to {}:{}: {}"
2969
 
                       .format(uid, gid, os.strerror(error.errno)))
2970
 
        if error.errno != errno.EPERM:
2971
 
            raise
2972
 
    
2973
 
    if debug:
2974
 
        # Enable all possible GnuTLS debugging
2975
 
        
2976
 
        # "Use a log level over 10 to enable all debugging options."
2977
 
        # - GnuTLS manual
2978
 
        gnutls.global_set_log_level(11)
2979
 
        
2980
 
        @gnutls.log_func
2981
 
        def debug_gnutls(level, string):
2982
 
            logger.debug("GnuTLS: %s", string[:-1])
2983
 
        
2984
 
        gnutls.global_set_log_function(debug_gnutls)
2985
 
        
2986
 
        # Redirect stdin so all checkers get /dev/null
2987
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
2988
 
        os.dup2(null, sys.stdin.fileno())
2989
 
        if null > 2:
2990
 
            os.close(null)
2991
 
    
2992
 
    # Need to fork before connecting to D-Bus
2993
 
    if not foreground:
2994
 
        # Close all input and output, do double fork, etc.
2995
 
        daemon()
2996
 
    
2997
 
    # multiprocessing will use threads, so before we use GLib we need
2998
 
    # to inform GLib that threads will be used.
2999
 
    GLib.threads_init()
 
724
    global service
 
725
    service = AvahiService(name = server_settings["servicename"],
 
726
                           type = "_mandos._tcp", );
3000
727
    
3001
728
    global main_loop
 
729
    global bus
 
730
    global server
3002
731
    # From the Avahi example code
3003
 
    DBusGMainLoop(set_as_default=True)
3004
 
    main_loop = GLib.MainLoop()
 
732
    DBusGMainLoop(set_as_default=True )
 
733
    main_loop = gobject.MainLoop()
3005
734
    bus = dbus.SystemBus()
 
735
    server = dbus.Interface(
 
736
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
737
            avahi.DBUS_INTERFACE_SERVER )
3006
738
    # End of Avahi example code
3007
 
    if use_dbus:
3008
 
        try:
3009
 
            bus_name = dbus.service.BusName("se.recompile.Mandos",
3010
 
                                            bus,
3011
 
                                            do_not_queue=True)
3012
 
            old_bus_name = dbus.service.BusName(
3013
 
                "se.bsnet.fukt.Mandos", bus,
3014
 
                do_not_queue=True)
3015
 
        except dbus.exceptions.DBusException as e:
3016
 
            logger.error("Disabling D-Bus:", exc_info=e)
3017
 
            use_dbus = False
3018
 
            server_settings["use_dbus"] = False
3019
 
            tcp_server.use_dbus = False
3020
 
    if zeroconf:
3021
 
        protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
3022
 
        service = AvahiServiceToSyslog(
3023
 
            name = server_settings["servicename"],
3024
 
            servicetype = "_mandos._tcp",
3025
 
            protocol = protocol,
3026
 
            bus = bus)
3027
 
        if server_settings["interface"]:
3028
 
            service.interface = if_nametoindex(
3029
 
                server_settings["interface"].encode("utf-8"))
3030
 
    
3031
 
    global multiprocessing_manager
3032
 
    multiprocessing_manager = multiprocessing.Manager()
3033
 
    
3034
 
    client_class = Client
3035
 
    if use_dbus:
3036
 
        client_class = functools.partial(ClientDBus, bus = bus)
3037
 
    
3038
 
    client_settings = Client.config_parser(client_config)
3039
 
    old_client_settings = {}
3040
 
    clients_data = {}
3041
 
    
3042
 
    # This is used to redirect stdout and stderr for checker processes
3043
 
    global wnull
3044
 
    wnull = open(os.devnull, "w") # A writable /dev/null
3045
 
    # Only used if server is running in foreground but not in debug
3046
 
    # mode
3047
 
    if debug or not foreground:
3048
 
        wnull.close()
3049
 
    
3050
 
    # Get client data and settings from last running state.
3051
 
    if server_settings["restore"]:
3052
 
        try:
3053
 
            with open(stored_state_path, "rb") as stored_state:
3054
 
                if sys.version_info.major == 2:                
3055
 
                    clients_data, old_client_settings = pickle.load(
3056
 
                        stored_state)
3057
 
                else:
3058
 
                    bytes_clients_data, bytes_old_client_settings = (
3059
 
                        pickle.load(stored_state, encoding = "bytes"))
3060
 
                    ### Fix bytes to strings
3061
 
                    ## clients_data
3062
 
                    # .keys()
3063
 
                    clients_data = { (key.decode("utf-8")
3064
 
                                      if isinstance(key, bytes)
3065
 
                                      else key): value
3066
 
                                     for key, value in
3067
 
                                     bytes_clients_data.items() }
3068
 
                    del bytes_clients_data
3069
 
                    for key in clients_data:
3070
 
                        value = { (k.decode("utf-8")
3071
 
                                   if isinstance(k, bytes) else k): v
3072
 
                                  for k, v in
3073
 
                                  clients_data[key].items() }
3074
 
                        clients_data[key] = value
3075
 
                        # .client_structure
3076
 
                        value["client_structure"] = [
3077
 
                            (s.decode("utf-8")
3078
 
                             if isinstance(s, bytes)
3079
 
                             else s) for s in
3080
 
                            value["client_structure"] ]
3081
 
                        # .name & .host
3082
 
                        for k in ("name", "host"):
3083
 
                            if isinstance(value[k], bytes):
3084
 
                                value[k] = value[k].decode("utf-8")
3085
 
                    ## old_client_settings
3086
 
                    # .keys()
3087
 
                    old_client_settings = {
3088
 
                        (key.decode("utf-8")
3089
 
                         if isinstance(key, bytes)
3090
 
                         else key): value
3091
 
                        for key, value in
3092
 
                        bytes_old_client_settings.items() }
3093
 
                    del bytes_old_client_settings
3094
 
                    # .host
3095
 
                    for value in old_client_settings.values():
3096
 
                        if isinstance(value["host"], bytes):
3097
 
                            value["host"] = (value["host"]
3098
 
                                             .decode("utf-8"))
3099
 
            os.remove(stored_state_path)
3100
 
        except IOError as e:
3101
 
            if e.errno == errno.ENOENT:
3102
 
                logger.warning("Could not load persistent state:"
3103
 
                               " {}".format(os.strerror(e.errno)))
3104
 
            else:
3105
 
                logger.critical("Could not load persistent state:",
3106
 
                                exc_info=e)
3107
 
                raise
3108
 
        except EOFError as e:
3109
 
            logger.warning("Could not load persistent state: "
3110
 
                           "EOFError:",
3111
 
                           exc_info=e)
3112
 
    
3113
 
    with PGPEngine() as pgp:
3114
 
        for client_name, client in clients_data.items():
3115
 
            # Skip removed clients
3116
 
            if client_name not in client_settings:
3117
 
                continue
3118
 
            
3119
 
            # Decide which value to use after restoring saved state.
3120
 
            # We have three different values: Old config file,
3121
 
            # new config file, and saved state.
3122
 
            # New config value takes precedence if it differs from old
3123
 
            # config value, otherwise use saved state.
3124
 
            for name, value in client_settings[client_name].items():
3125
 
                try:
3126
 
                    # For each value in new config, check if it
3127
 
                    # differs from the old config value (Except for
3128
 
                    # the "secret" attribute)
3129
 
                    if (name != "secret"
3130
 
                        and (value !=
3131
 
                             old_client_settings[client_name][name])):
3132
 
                        client[name] = value
3133
 
                except KeyError:
3134
 
                    pass
3135
 
            
3136
 
            # Clients who has passed its expire date can still be
3137
 
            # enabled if its last checker was successful.  A Client
3138
 
            # whose checker succeeded before we stored its state is
3139
 
            # assumed to have successfully run all checkers during
3140
 
            # downtime.
3141
 
            if client["enabled"]:
3142
 
                if datetime.datetime.utcnow() >= client["expires"]:
3143
 
                    if not client["last_checked_ok"]:
3144
 
                        logger.warning(
3145
 
                            "disabling client {} - Client never "
3146
 
                            "performed a successful checker".format(
3147
 
                                client_name))
3148
 
                        client["enabled"] = False
3149
 
                    elif client["last_checker_status"] != 0:
3150
 
                        logger.warning(
3151
 
                            "disabling client {} - Client last"
3152
 
                            " checker failed with error code"
3153
 
                            " {}".format(
3154
 
                                client_name,
3155
 
                                client["last_checker_status"]))
3156
 
                        client["enabled"] = False
3157
 
                    else:
3158
 
                        client["expires"] = (
3159
 
                            datetime.datetime.utcnow()
3160
 
                            + client["timeout"])
3161
 
                        logger.debug("Last checker succeeded,"
3162
 
                                     " keeping {} enabled".format(
3163
 
                                         client_name))
3164
 
            try:
3165
 
                client["secret"] = pgp.decrypt(
3166
 
                    client["encrypted_secret"],
3167
 
                    client_settings[client_name]["secret"])
3168
 
            except PGPError:
3169
 
                # If decryption fails, we use secret from new settings
3170
 
                logger.debug("Failed to decrypt {} old secret".format(
3171
 
                    client_name))
3172
 
                client["secret"] = (client_settings[client_name]
3173
 
                                    ["secret"])
3174
 
    
3175
 
    # Add/remove clients based on new changes made to config
3176
 
    for client_name in (set(old_client_settings)
3177
 
                        - set(client_settings)):
3178
 
        del clients_data[client_name]
3179
 
    for client_name in (set(client_settings)
3180
 
                        - set(old_client_settings)):
3181
 
        clients_data[client_name] = client_settings[client_name]
3182
 
    
3183
 
    # Create all client objects
3184
 
    for client_name, client in clients_data.items():
3185
 
        tcp_server.clients[client_name] = client_class(
3186
 
            name = client_name,
3187
 
            settings = client,
3188
 
            server_settings = server_settings)
3189
 
    
3190
 
    if not tcp_server.clients:
3191
 
        logger.warning("No clients defined")
3192
 
    
3193
 
    if not foreground:
3194
 
        if pidfile is not None:
3195
 
            pid = os.getpid()
3196
 
            try:
3197
 
                with pidfile:
3198
 
                    print(pid, file=pidfile)
3199
 
            except IOError:
3200
 
                logger.error("Could not write to file %r with PID %d",
3201
 
                             pidfilename, pid)
3202
 
        del pidfile
3203
 
        del pidfilename
3204
 
    
3205
 
    for termsig in (signal.SIGHUP, signal.SIGTERM):
3206
 
        GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,
3207
 
                             lambda: main_loop.quit() and False)
3208
 
    
3209
 
    if use_dbus:
3210
 
        
3211
 
        @alternate_dbus_interfaces(
3212
 
            { "se.recompile.Mandos": "se.bsnet.fukt.Mandos" })
3213
 
        class MandosDBusService(DBusObjectWithObjectManager):
3214
 
            """A D-Bus proxy object"""
3215
 
            
3216
 
            def __init__(self):
3217
 
                dbus.service.Object.__init__(self, bus, "/")
3218
 
            
3219
 
            _interface = "se.recompile.Mandos"
3220
 
            
3221
 
            @dbus.service.signal(_interface, signature="o")
3222
 
            def ClientAdded(self, objpath):
3223
 
                "D-Bus signal"
3224
 
                pass
3225
 
            
3226
 
            @dbus.service.signal(_interface, signature="ss")
3227
 
            def ClientNotFound(self, fingerprint, address):
3228
 
                "D-Bus signal"
3229
 
                pass
3230
 
            
3231
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3232
 
                               "true"})
3233
 
            @dbus.service.signal(_interface, signature="os")
3234
 
            def ClientRemoved(self, objpath, name):
3235
 
                "D-Bus signal"
3236
 
                pass
3237
 
            
3238
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3239
 
                               "true"})
3240
 
            @dbus.service.method(_interface, out_signature="ao")
3241
 
            def GetAllClients(self):
3242
 
                "D-Bus method"
3243
 
                return dbus.Array(c.dbus_object_path for c in
3244
 
                                  tcp_server.clients.values())
3245
 
            
3246
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3247
 
                               "true"})
3248
 
            @dbus.service.method(_interface,
3249
 
                                 out_signature="a{oa{sv}}")
3250
 
            def GetAllClientsWithProperties(self):
3251
 
                "D-Bus method"
3252
 
                return dbus.Dictionary(
3253
 
                    { c.dbus_object_path: c.GetAll(
3254
 
                        "se.recompile.Mandos.Client")
3255
 
                      for c in tcp_server.clients.values() },
3256
 
                    signature="oa{sv}")
3257
 
            
3258
 
            @dbus.service.method(_interface, in_signature="o")
3259
 
            def RemoveClient(self, object_path):
3260
 
                "D-Bus method"
3261
 
                for c in tcp_server.clients.values():
3262
 
                    if c.dbus_object_path == object_path:
3263
 
                        del tcp_server.clients[c.name]
3264
 
                        c.remove_from_connection()
3265
 
                        # Don't signal the disabling
3266
 
                        c.disable(quiet=True)
3267
 
                        # Emit D-Bus signal for removal
3268
 
                        self.client_removed_signal(c)
3269
 
                        return
3270
 
                raise KeyError(object_path)
3271
 
            
3272
 
            del _interface
3273
 
            
3274
 
            @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
3275
 
                                 out_signature = "a{oa{sa{sv}}}")
3276
 
            def GetManagedObjects(self):
3277
 
                """D-Bus method"""
3278
 
                return dbus.Dictionary(
3279
 
                    { client.dbus_object_path:
3280
 
                      dbus.Dictionary(
3281
 
                          { interface: client.GetAll(interface)
3282
 
                            for interface in
3283
 
                                 client._get_all_interface_names()})
3284
 
                      for client in tcp_server.clients.values()})
3285
 
            
3286
 
            def client_added_signal(self, client):
3287
 
                """Send the new standard signal and the old signal"""
3288
 
                if use_dbus:
3289
 
                    # New standard signal
3290
 
                    self.InterfacesAdded(
3291
 
                        client.dbus_object_path,
3292
 
                        dbus.Dictionary(
3293
 
                            { interface: client.GetAll(interface)
3294
 
                              for interface in
3295
 
                              client._get_all_interface_names()}))
3296
 
                    # Old signal
3297
 
                    self.ClientAdded(client.dbus_object_path)
3298
 
            
3299
 
            def client_removed_signal(self, client):
3300
 
                """Send the new standard signal and the old signal"""
3301
 
                if use_dbus:
3302
 
                    # New standard signal
3303
 
                    self.InterfacesRemoved(
3304
 
                        client.dbus_object_path,
3305
 
                        client._get_all_interface_names())
3306
 
                    # Old signal
3307
 
                    self.ClientRemoved(client.dbus_object_path,
3308
 
                                       client.name)
3309
 
        
3310
 
        mandos_dbus_service = MandosDBusService()
3311
 
    
3312
 
    # Save modules to variables to exempt the modules from being
3313
 
    # unloaded before the function registered with atexit() is run.
3314
 
    mp = multiprocessing
3315
 
    wn = wnull
 
739
    
 
740
    debug = server_settings["debug"]
 
741
    
 
742
    if debug:
 
743
        console = logging.StreamHandler()
 
744
        # console.setLevel(logging.DEBUG)
 
745
        console.setFormatter(logging.Formatter\
 
746
                             ('%(levelname)s: %(message)s'))
 
747
        logger.addHandler(console)
 
748
        del console
 
749
    
 
750
    clients = Set()
 
751
    def remove_from_clients(client):
 
752
        clients.remove(client)
 
753
        if not clients:
 
754
            logger.debug(u"No clients left, exiting")
 
755
            sys.exit()
 
756
    
 
757
    clients.update(Set(Client(name=section,
 
758
                              stop_hook = remove_from_clients,
 
759
                              **(dict(client_config\
 
760
                                      .items(section))))
 
761
                       for section in client_config.sections()))
 
762
    
 
763
    if not debug:
 
764
        daemon(False, False)
 
765
    
3316
766
    def cleanup():
3317
767
        "Cleanup function; run on exit"
3318
 
        if zeroconf:
3319
 
            service.cleanup()
3320
 
        
3321
 
        mp.active_children()
3322
 
        wn.close()
3323
 
        if not (tcp_server.clients or client_settings):
3324
 
            return
3325
 
        
3326
 
        # Store client before exiting. Secrets are encrypted with key
3327
 
        # based on what config file has. If config file is
3328
 
        # removed/edited, old secret will thus be unrecovable.
3329
 
        clients = {}
3330
 
        with PGPEngine() as pgp:
3331
 
            for client in tcp_server.clients.values():
3332
 
                key = client_settings[client.name]["secret"]
3333
 
                client.encrypted_secret = pgp.encrypt(client.secret,
3334
 
                                                      key)
3335
 
                client_dict = {}
3336
 
                
3337
 
                # A list of attributes that can not be pickled
3338
 
                # + secret.
3339
 
                exclude = { "bus", "changedstate", "secret",
3340
 
                            "checker", "server_settings" }
3341
 
                for name, typ in inspect.getmembers(dbus.service
3342
 
                                                    .Object):
3343
 
                    exclude.add(name)
3344
 
                
3345
 
                client_dict["encrypted_secret"] = (client
3346
 
                                                   .encrypted_secret)
3347
 
                for attr in client.client_structure:
3348
 
                    if attr not in exclude:
3349
 
                        client_dict[attr] = getattr(client, attr)
3350
 
                
3351
 
                clients[client.name] = client_dict
3352
 
                del client_settings[client.name]["secret"]
3353
 
        
3354
 
        try:
3355
 
            with tempfile.NamedTemporaryFile(
3356
 
                    mode='wb',
3357
 
                    suffix=".pickle",
3358
 
                    prefix='clients-',
3359
 
                    dir=os.path.dirname(stored_state_path),
3360
 
                    delete=False) as stored_state:
3361
 
                pickle.dump((clients, client_settings), stored_state,
3362
 
                            protocol = 2)
3363
 
                tempname = stored_state.name
3364
 
            os.rename(tempname, stored_state_path)
3365
 
        except (IOError, OSError) as e:
3366
 
            if not debug:
3367
 
                try:
3368
 
                    os.remove(tempname)
3369
 
                except NameError:
3370
 
                    pass
3371
 
            if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
3372
 
                logger.warning("Could not save persistent state: {}"
3373
 
                               .format(os.strerror(e.errno)))
3374
 
            else:
3375
 
                logger.warning("Could not save persistent state:",
3376
 
                               exc_info=e)
3377
 
                raise
3378
 
        
3379
 
        # Delete all clients, and settings from config
3380
 
        while tcp_server.clients:
3381
 
            name, client = tcp_server.clients.popitem()
3382
 
            if use_dbus:
3383
 
                client.remove_from_connection()
3384
 
            # Don't signal the disabling
3385
 
            client.disable(quiet=True)
3386
 
            # Emit D-Bus signal for removal
3387
 
            if use_dbus:
3388
 
                mandos_dbus_service.client_removed_signal(client)
3389
 
        client_settings.clear()
 
768
        global group
 
769
        # From the Avahi example code
 
770
        if not group is None:
 
771
            group.Free()
 
772
            group = None
 
773
        # End of Avahi example code
 
774
        
 
775
        while clients:
 
776
            client = clients.pop()
 
777
            client.stop_hook = None
 
778
            client.stop()
3390
779
    
3391
780
    atexit.register(cleanup)
3392
781
    
3393
 
    for client in tcp_server.clients.values():
3394
 
        if use_dbus:
3395
 
            # Emit D-Bus signal for adding
3396
 
            mandos_dbus_service.client_added_signal(client)
3397
 
        # Need to initiate checking of clients
3398
 
        if client.enabled:
3399
 
            client.init_checker()
3400
 
    
3401
 
    tcp_server.enable()
3402
 
    tcp_server.server_activate()
3403
 
    
 
782
    if not debug:
 
783
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
784
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
785
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
786
    
 
787
    for client in clients:
 
788
        client.start()
 
789
    
 
790
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
791
                                 server_settings["port"]),
 
792
                                tcp_handler,
 
793
                                settings=server_settings,
 
794
                                clients=clients)
3404
795
    # Find out what port we got
3405
 
    if zeroconf:
3406
 
        service.port = tcp_server.socket.getsockname()[1]
3407
 
    if use_ipv6:
3408
 
        logger.info("Now listening on address %r, port %d,"
3409
 
                    " flowinfo %d, scope_id %d",
3410
 
                    *tcp_server.socket.getsockname())
3411
 
    else:                       # IPv4
3412
 
        logger.info("Now listening on address %r, port %d",
3413
 
                    *tcp_server.socket.getsockname())
 
796
    service.port = tcp_server.socket.getsockname()[1]
 
797
    logger.debug(u"Now listening on port %d", service.port)
3414
798
    
3415
 
    #service.interface = tcp_server.socket.getsockname()[3]
 
799
    if not server_settings["interface"]:
 
800
        service.interface = if_nametoindex\
 
801
                            (server_settings["interface"])
3416
802
    
3417
803
    try:
3418
 
        if zeroconf:
3419
 
            # From the Avahi example code
3420
 
            try:
3421
 
                service.activate()
3422
 
            except dbus.exceptions.DBusException as error:
3423
 
                logger.critical("D-Bus Exception", exc_info=error)
3424
 
                cleanup()
3425
 
                sys.exit(1)
3426
 
            # End of Avahi example code
 
804
        # From the Avahi example code
 
805
        server.connect_to_signal("StateChanged", server_state_changed)
 
806
        try:
 
807
            server_state_changed(server.GetState())
 
808
        except dbus.exceptions.DBusException, error:
 
809
            logger.critical(u"DBusException: %s", error)
 
810
            sys.exit(1)
 
811
        # End of Avahi example code
3427
812
        
3428
 
        GLib.io_add_watch(tcp_server.fileno(), GLib.IO_IN,
3429
 
                          lambda *args, **kwargs:
3430
 
                          (tcp_server.handle_request
3431
 
                           (*args[2:], **kwargs) or True))
 
813
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
814
                             lambda *args, **kwargs:
 
815
                             tcp_server.handle_request\
 
816
                             (*args[2:], **kwargs) or True)
3432
817
        
3433
818
        logger.debug("Starting main loop")
 
819
        main_loop_started = True
3434
820
        main_loop.run()
3435
 
    except AvahiError as error:
3436
 
        logger.critical("Avahi Error", exc_info=error)
3437
 
        cleanup()
 
821
    except AvahiError, error:
 
822
        logger.critical(u"AvahiError: %s" + unicode(error))
3438
823
        sys.exit(1)
3439
824
    except KeyboardInterrupt:
3440
825
        if debug:
3441
 
            print("", file=sys.stderr)
3442
 
        logger.debug("Server received KeyboardInterrupt")
3443
 
    logger.debug("Server exiting")
3444
 
    # Must run before the D-Bus bus name gets deregistered
3445
 
    cleanup()
3446
 
 
 
826
            print
3447
827
 
3448
828
if __name__ == '__main__':
3449
829
    main()