/mandos/trunk

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  • Committer: Teddy Hogeborn
  • Date: 2016-03-19 03:48:56 UTC
  • Revision ID: teddy@recompile.se-20160319034856-d8rox0kdxekgr03g
Server: Make persistent state directory mode u=rwx,go=

The Makefile target "install-server" creates the server persistent
state directory /var/lib/mandos as mode u=rwx,go= (0700).  Make this
also the case for the Debian package (unless overridden by
dpkg-statoverride).

* debian/mandos.postinst (configure): Fix state directory permissions,
  but only if not listed by "dpkg-statoverride".

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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" and "remove" in the "AvahiService" class, the
10
 
# "server_state_changed" and "entry_group_state_changed" functions,
11
 
# and some lines in "main".
 
9
# methods "add", "remove", "server_state_changed",
 
10
# "entry_group_state_changed", "cleanup", and "activate" in the
 
11
# "AvahiService" class, and some lines in "main".
12
12
13
13
# Everything else is
14
 
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
 
14
# Copyright © 2008-2016 Teddy Hogeborn
 
15
# Copyright © 2008-2016 Björn Påhlsson
15
16
16
17
# This program is free software: you can redistribute it and/or modify
17
18
# it under the terms of the GNU General Public License as published by
27
28
# along with this program.  If not, see
28
29
# <http://www.gnu.org/licenses/>.
29
30
30
 
# Contact the authors at <mandos@fukt.bsnet.se>.
 
31
# Contact the authors at <mandos@recompile.se>.
31
32
32
33
 
33
 
from __future__ import division
34
 
 
35
 
import SocketServer
 
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
36
46
import socket
37
 
import select
38
 
from optparse import OptionParser
 
47
import argparse
39
48
import datetime
40
49
import errno
41
 
import gnutls.crypto
42
 
import gnutls.connection
43
 
import gnutls.errors
44
 
import gnutls.library.functions
45
 
import gnutls.library.constants
46
 
import gnutls.library.types
47
 
import ConfigParser
 
50
try:
 
51
    import ConfigParser as configparser
 
52
except ImportError:
 
53
    import configparser
48
54
import sys
49
55
import re
50
56
import os
51
57
import signal
52
 
from sets import Set
53
58
import subprocess
54
59
import atexit
55
60
import stat
56
61
import logging
57
62
import logging.handlers
58
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
59
79
 
60
80
import dbus
61
 
import gobject
62
 
import avahi
 
81
import dbus.service
 
82
from gi.repository import GLib
63
83
from dbus.mainloop.glib import DBusGMainLoop
64
84
import ctypes
65
 
 
66
 
version = "1.0"
67
 
 
68
 
logger = logging.Logger('mandos')
69
 
syslogger = logging.handlers.SysLogHandler\
70
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
71
 
             address = "/dev/log")
72
 
syslogger.setFormatter(logging.Formatter\
73
 
                        ('Mandos: %(levelname)s: %(message)s'))
74
 
logger.addHandler(syslogger)
75
 
 
76
 
console = logging.StreamHandler()
77
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
78
 
                                       ' %(message)s'))
79
 
logger.addHandler(console)
 
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 = "1.7.6"
 
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
                          '--no-use-agent']
 
185
    
 
186
    def __enter__(self):
 
187
        return self
 
188
    
 
189
    def __exit__(self, exc_type, exc_value, traceback):
 
190
        self._cleanup()
 
191
        return False
 
192
    
 
193
    def __del__(self):
 
194
        self._cleanup()
 
195
    
 
196
    def _cleanup(self):
 
197
        if self.tempdir is not None:
 
198
            # Delete contents of tempdir
 
199
            for root, dirs, files in os.walk(self.tempdir,
 
200
                                             topdown = False):
 
201
                for filename in files:
 
202
                    os.remove(os.path.join(root, filename))
 
203
                for dirname in dirs:
 
204
                    os.rmdir(os.path.join(root, dirname))
 
205
            # Remove tempdir
 
206
            os.rmdir(self.tempdir)
 
207
            self.tempdir = None
 
208
    
 
209
    def password_encode(self, password):
 
210
        # Passphrase can not be empty and can not contain newlines or
 
211
        # NUL bytes.  So we prefix it and hex encode it.
 
212
        encoded = b"mandos" + binascii.hexlify(password)
 
213
        if len(encoded) > 2048:
 
214
            # GnuPG can't handle long passwords, so encode differently
 
215
            encoded = (b"mandos" + password.replace(b"\\", b"\\\\")
 
216
                       .replace(b"\n", b"\\n")
 
217
                       .replace(b"\0", b"\\x00"))
 
218
        return encoded
 
219
    
 
220
    def encrypt(self, data, password):
 
221
        passphrase = self.password_encode(password)
 
222
        with tempfile.NamedTemporaryFile(
 
223
                dir=self.tempdir) as passfile:
 
224
            passfile.write(passphrase)
 
225
            passfile.flush()
 
226
            proc = subprocess.Popen([self.gpg, '--symmetric',
 
227
                                     '--passphrase-file',
 
228
                                     passfile.name]
 
229
                                    + self.gnupgargs,
 
230
                                    stdin = subprocess.PIPE,
 
231
                                    stdout = subprocess.PIPE,
 
232
                                    stderr = subprocess.PIPE)
 
233
            ciphertext, err = proc.communicate(input = data)
 
234
        if proc.returncode != 0:
 
235
            raise PGPError(err)
 
236
        return ciphertext
 
237
    
 
238
    def decrypt(self, data, password):
 
239
        passphrase = self.password_encode(password)
 
240
        with tempfile.NamedTemporaryFile(
 
241
                dir = self.tempdir) as passfile:
 
242
            passfile.write(passphrase)
 
243
            passfile.flush()
 
244
            proc = subprocess.Popen([self.gpg, '--decrypt',
 
245
                                     '--passphrase-file',
 
246
                                     passfile.name]
 
247
                                    + self.gnupgargs,
 
248
                                    stdin = subprocess.PIPE,
 
249
                                    stdout = subprocess.PIPE,
 
250
                                    stderr = subprocess.PIPE)
 
251
            decrypted_plaintext, err = proc.communicate(input = data)
 
252
        if proc.returncode != 0:
 
253
            raise PGPError(err)
 
254
        return decrypted_plaintext
 
255
 
 
256
# Pretend that we have an Avahi module
 
257
class Avahi(object):
 
258
    """This isn't so much a class as it is a module-like namespace.
 
259
    It is instantiated once, and simulates having an Avahi module."""
 
260
    IF_UNSPEC = -1              # avahi-common/address.h
 
261
    PROTO_UNSPEC = -1           # avahi-common/address.h
 
262
    PROTO_INET = 0              # avahi-common/address.h
 
263
    PROTO_INET6 = 1             # avahi-common/address.h
 
264
    DBUS_NAME = "org.freedesktop.Avahi"
 
265
    DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"
 
266
    DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"
 
267
    DBUS_PATH_SERVER = "/"
 
268
    def string_array_to_txt_array(self, t):
 
269
        return dbus.Array((dbus.ByteArray(s.encode("utf-8"))
 
270
                           for s in t), signature="ay")
 
271
    ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h
 
272
    ENTRY_GROUP_COLLISION = 3   # avahi-common/defs.h
 
273
    ENTRY_GROUP_FAILURE = 4     # avahi-common/defs.h
 
274
    SERVER_INVALID = 0          # avahi-common/defs.h
 
275
    SERVER_REGISTERING = 1      # avahi-common/defs.h
 
276
    SERVER_RUNNING = 2          # avahi-common/defs.h
 
277
    SERVER_COLLISION = 3        # avahi-common/defs.h
 
278
    SERVER_FAILURE = 4          # avahi-common/defs.h
 
279
avahi = Avahi()
80
280
 
81
281
class AvahiError(Exception):
82
 
    def __init__(self, value):
 
282
    def __init__(self, value, *args, **kwargs):
83
283
        self.value = value
84
 
    def __str__(self):
85
 
        return repr(self.value)
 
284
        return super(AvahiError, self).__init__(value, *args,
 
285
                                                **kwargs)
 
286
 
86
287
 
87
288
class AvahiServiceError(AvahiError):
88
289
    pass
89
290
 
 
291
 
90
292
class AvahiGroupError(AvahiError):
91
293
    pass
92
294
 
93
295
 
94
296
class AvahiService(object):
95
297
    """An Avahi (Zeroconf) service.
 
298
    
96
299
    Attributes:
97
300
    interface: integer; avahi.IF_UNSPEC or an interface index.
98
301
               Used to optionally bind to the specified interface.
99
302
    name: string; Example: 'Mandos'
100
303
    type: string; Example: '_mandos._tcp'.
101
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
 
304
     See <https://www.iana.org/assignments/service-names-port-numbers>
102
305
    port: integer; what port to announce
103
306
    TXT: list of strings; TXT record for the service
104
307
    domain: string; Domain to publish on, default to .local if empty.
106
309
    max_renames: integer; maximum number of renames
107
310
    rename_count: integer; counter so we only rename after collisions
108
311
                  a sensible number of times
 
312
    group: D-Bus Entry Group
 
313
    server: D-Bus Server
 
314
    bus: dbus.SystemBus()
109
315
    """
110
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
111
 
                 type = None, port = None, TXT = None, domain = "",
112
 
                 host = "", max_renames = 32768):
 
316
    
 
317
    def __init__(self,
 
318
                 interface = avahi.IF_UNSPEC,
 
319
                 name = None,
 
320
                 servicetype = None,
 
321
                 port = None,
 
322
                 TXT = None,
 
323
                 domain = "",
 
324
                 host = "",
 
325
                 max_renames = 32768,
 
326
                 protocol = avahi.PROTO_UNSPEC,
 
327
                 bus = None):
113
328
        self.interface = interface
114
329
        self.name = name
115
 
        self.type = type
 
330
        self.type = servicetype
116
331
        self.port = port
117
 
        if TXT is None:
118
 
            self.TXT = []
119
 
        else:
120
 
            self.TXT = TXT
 
332
        self.TXT = TXT if TXT is not None else []
121
333
        self.domain = domain
122
334
        self.host = host
123
335
        self.rename_count = 0
124
336
        self.max_renames = max_renames
125
 
    def rename(self):
 
337
        self.protocol = protocol
 
338
        self.group = None       # our entry group
 
339
        self.server = None
 
340
        self.bus = bus
 
341
        self.entry_group_state_changed_match = None
 
342
    
 
343
    def rename(self, remove=True):
126
344
        """Derived from the Avahi example code"""
127
345
        if self.rename_count >= self.max_renames:
128
 
            logger.critical(u"No suitable Zeroconf service name found"
129
 
                            u" after %i retries, exiting.",
130
 
                            rename_count)
 
346
            logger.critical("No suitable Zeroconf service name found"
 
347
                            " after %i retries, exiting.",
 
348
                            self.rename_count)
131
349
            raise AvahiServiceError("Too many renames")
132
 
        self.name = server.GetAlternativeServiceName(self.name)
133
 
        logger.info(u"Changing Zeroconf service name to %r ...",
134
 
                    str(self.name))
135
 
        syslogger.setFormatter(logging.Formatter\
136
 
                               ('Mandos (%s): %%(levelname)s:'
137
 
                               ' %%(message)s' % self.name))
138
 
        self.remove()
139
 
        self.add()
 
350
        self.name = str(
 
351
            self.server.GetAlternativeServiceName(self.name))
140
352
        self.rename_count += 1
 
353
        logger.info("Changing Zeroconf service name to %r ...",
 
354
                    self.name)
 
355
        if remove:
 
356
            self.remove()
 
357
        try:
 
358
            self.add()
 
359
        except dbus.exceptions.DBusException as error:
 
360
            if (error.get_dbus_name()
 
361
                == "org.freedesktop.Avahi.CollisionError"):
 
362
                logger.info("Local Zeroconf service name collision.")
 
363
                return self.rename(remove=False)
 
364
            else:
 
365
                logger.critical("D-Bus Exception", exc_info=error)
 
366
                self.cleanup()
 
367
                os._exit(1)
 
368
    
141
369
    def remove(self):
142
370
        """Derived from the Avahi example code"""
143
 
        if group is not None:
144
 
            group.Reset()
 
371
        if self.entry_group_state_changed_match is not None:
 
372
            self.entry_group_state_changed_match.remove()
 
373
            self.entry_group_state_changed_match = None
 
374
        if self.group is not None:
 
375
            self.group.Reset()
 
376
    
145
377
    def add(self):
146
378
        """Derived from the Avahi example code"""
147
 
        global group
148
 
        if group is None:
149
 
            group = dbus.Interface\
150
 
                    (bus.get_object(avahi.DBUS_NAME,
151
 
                                    server.EntryGroupNew()),
152
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
153
 
            group.connect_to_signal('StateChanged',
154
 
                                    entry_group_state_changed)
155
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
156
 
                     service.name, service.type)
157
 
        group.AddService(
158
 
                self.interface,         # interface
159
 
                avahi.PROTO_INET6,      # protocol
160
 
                dbus.UInt32(0),         # flags
161
 
                self.name, self.type,
162
 
                self.domain, self.host,
163
 
                dbus.UInt16(self.port),
164
 
                avahi.string_array_to_txt_array(self.TXT))
165
 
        group.Commit()
166
 
 
167
 
# From the Avahi example code:
168
 
group = None                            # our entry group
169
 
# End of Avahi example code
170
 
 
 
379
        self.remove()
 
380
        if self.group is None:
 
381
            self.group = dbus.Interface(
 
382
                self.bus.get_object(avahi.DBUS_NAME,
 
383
                                    self.server.EntryGroupNew()),
 
384
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
385
        self.entry_group_state_changed_match = (
 
386
            self.group.connect_to_signal(
 
387
                'StateChanged', self.entry_group_state_changed))
 
388
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
 
389
                     self.name, self.type)
 
390
        self.group.AddService(
 
391
            self.interface,
 
392
            self.protocol,
 
393
            dbus.UInt32(0),     # flags
 
394
            self.name, self.type,
 
395
            self.domain, self.host,
 
396
            dbus.UInt16(self.port),
 
397
            avahi.string_array_to_txt_array(self.TXT))
 
398
        self.group.Commit()
 
399
    
 
400
    def entry_group_state_changed(self, state, error):
 
401
        """Derived from the Avahi example code"""
 
402
        logger.debug("Avahi entry group state change: %i", state)
 
403
        
 
404
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
405
            logger.debug("Zeroconf service established.")
 
406
        elif state == avahi.ENTRY_GROUP_COLLISION:
 
407
            logger.info("Zeroconf service name collision.")
 
408
            self.rename()
 
409
        elif state == avahi.ENTRY_GROUP_FAILURE:
 
410
            logger.critical("Avahi: Error in group state changed %s",
 
411
                            str(error))
 
412
            raise AvahiGroupError("State changed: {!s}".format(error))
 
413
    
 
414
    def cleanup(self):
 
415
        """Derived from the Avahi example code"""
 
416
        if self.group is not None:
 
417
            try:
 
418
                self.group.Free()
 
419
            except (dbus.exceptions.UnknownMethodException,
 
420
                    dbus.exceptions.DBusException):
 
421
                pass
 
422
            self.group = None
 
423
        self.remove()
 
424
    
 
425
    def server_state_changed(self, state, error=None):
 
426
        """Derived from the Avahi example code"""
 
427
        logger.debug("Avahi server state change: %i", state)
 
428
        bad_states = {
 
429
            avahi.SERVER_INVALID: "Zeroconf server invalid",
 
430
            avahi.SERVER_REGISTERING: None,
 
431
            avahi.SERVER_COLLISION: "Zeroconf server name collision",
 
432
            avahi.SERVER_FAILURE: "Zeroconf server failure",
 
433
        }
 
434
        if state in bad_states:
 
435
            if bad_states[state] is not None:
 
436
                if error is None:
 
437
                    logger.error(bad_states[state])
 
438
                else:
 
439
                    logger.error(bad_states[state] + ": %r", error)
 
440
            self.cleanup()
 
441
        elif state == avahi.SERVER_RUNNING:
 
442
            try:
 
443
                self.add()
 
444
            except dbus.exceptions.DBusException as error:
 
445
                if (error.get_dbus_name()
 
446
                    == "org.freedesktop.Avahi.CollisionError"):
 
447
                    logger.info("Local Zeroconf service name"
 
448
                                " collision.")
 
449
                    return self.rename(remove=False)
 
450
                else:
 
451
                    logger.critical("D-Bus Exception", exc_info=error)
 
452
                    self.cleanup()
 
453
                    os._exit(1)
 
454
        else:
 
455
            if error is None:
 
456
                logger.debug("Unknown state: %r", state)
 
457
            else:
 
458
                logger.debug("Unknown state: %r: %r", state, error)
 
459
    
 
460
    def activate(self):
 
461
        """Derived from the Avahi example code"""
 
462
        if self.server is None:
 
463
            self.server = dbus.Interface(
 
464
                self.bus.get_object(avahi.DBUS_NAME,
 
465
                                    avahi.DBUS_PATH_SERVER,
 
466
                                    follow_name_owner_changes=True),
 
467
                avahi.DBUS_INTERFACE_SERVER)
 
468
        self.server.connect_to_signal("StateChanged",
 
469
                                      self.server_state_changed)
 
470
        self.server_state_changed(self.server.GetState())
 
471
 
 
472
 
 
473
class AvahiServiceToSyslog(AvahiService):
 
474
    def rename(self, *args, **kwargs):
 
475
        """Add the new name to the syslog messages"""
 
476
        ret = AvahiService.rename(self, *args, **kwargs)
 
477
        syslogger.setFormatter(logging.Formatter(
 
478
            'Mandos ({}) [%(process)d]: %(levelname)s: %(message)s'
 
479
            .format(self.name)))
 
480
        return ret
 
481
 
 
482
# Pretend that we have a GnuTLS module
 
483
class GnuTLS(object):
 
484
    """This isn't so much a class as it is a module-like namespace.
 
485
    It is instantiated once, and simulates having a GnuTLS module."""
 
486
    
 
487
    _library = ctypes.cdll.LoadLibrary(
 
488
        ctypes.util.find_library("gnutls"))
 
489
    _need_version = b"3.3.0"
 
490
    def __init__(self):
 
491
        # Need to use class name "GnuTLS" here, since this method is
 
492
        # called before the assignment to the "gnutls" global variable
 
493
        # happens.
 
494
        if GnuTLS.check_version(self._need_version) is None:
 
495
            raise GnuTLS.Error("Needs GnuTLS {} or later"
 
496
                               .format(self._need_version))
 
497
    
 
498
    # Unless otherwise indicated, the constants and types below are
 
499
    # all from the gnutls/gnutls.h C header file.
 
500
    
 
501
    # Constants
 
502
    E_SUCCESS = 0
 
503
    E_INTERRUPTED = -52
 
504
    E_AGAIN = -28
 
505
    CRT_OPENPGP = 2
 
506
    CLIENT = 2
 
507
    SHUT_RDWR = 0
 
508
    CRD_CERTIFICATE = 1
 
509
    E_NO_CERTIFICATE_FOUND = -49
 
510
    OPENPGP_FMT_RAW = 0         # gnutls/openpgp.h
 
511
    
 
512
    # Types
 
513
    class session_int(ctypes.Structure):
 
514
        _fields_ = []
 
515
    session_t = ctypes.POINTER(session_int)
 
516
    class certificate_credentials_st(ctypes.Structure):
 
517
        _fields_ = []
 
518
    certificate_credentials_t = ctypes.POINTER(
 
519
        certificate_credentials_st)
 
520
    certificate_type_t = ctypes.c_int
 
521
    class datum_t(ctypes.Structure):
 
522
        _fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),
 
523
                    ('size', ctypes.c_uint)]
 
524
    class openpgp_crt_int(ctypes.Structure):
 
525
        _fields_ = []
 
526
    openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)
 
527
    openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h
 
528
    log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)
 
529
    credentials_type_t = ctypes.c_int
 
530
    transport_ptr_t = ctypes.c_void_p
 
531
    close_request_t = ctypes.c_int
 
532
    
 
533
    # Exceptions
 
534
    class Error(Exception):
 
535
        # We need to use the class name "GnuTLS" here, since this
 
536
        # exception might be raised from within GnuTLS.__init__,
 
537
        # which is called before the assignment to the "gnutls"
 
538
        # global variable has happened.
 
539
        def __init__(self, message = None, code = None, args=()):
 
540
            # Default usage is by a message string, but if a return
 
541
            # code is passed, convert it to a string with
 
542
            # gnutls.strerror()
 
543
            self.code = code
 
544
            if message is None and code is not None:
 
545
                message = GnuTLS.strerror(code)
 
546
            return super(GnuTLS.Error, self).__init__(
 
547
                message, *args)
 
548
    
 
549
    class CertificateSecurityError(Error):
 
550
        pass
 
551
    
 
552
    # Classes
 
553
    class Credentials(object):
 
554
        def __init__(self):
 
555
            self._c_object = gnutls.certificate_credentials_t()
 
556
            gnutls.certificate_allocate_credentials(
 
557
                ctypes.byref(self._c_object))
 
558
            self.type = gnutls.CRD_CERTIFICATE
 
559
        
 
560
        def __del__(self):
 
561
            gnutls.certificate_free_credentials(self._c_object)
 
562
    
 
563
    class ClientSession(object):
 
564
        def __init__(self, socket, credentials = None):
 
565
            self._c_object = gnutls.session_t()
 
566
            gnutls.init(ctypes.byref(self._c_object), gnutls.CLIENT)
 
567
            gnutls.set_default_priority(self._c_object)
 
568
            gnutls.transport_set_ptr(self._c_object, socket.fileno())
 
569
            gnutls.handshake_set_private_extensions(self._c_object,
 
570
                                                    True)
 
571
            self.socket = socket
 
572
            if credentials is None:
 
573
                credentials = gnutls.Credentials()
 
574
            gnutls.credentials_set(self._c_object, credentials.type,
 
575
                                   ctypes.cast(credentials._c_object,
 
576
                                               ctypes.c_void_p))
 
577
            self.credentials = credentials
 
578
        
 
579
        def __del__(self):
 
580
            gnutls.deinit(self._c_object)
 
581
        
 
582
        def handshake(self):
 
583
            return gnutls.handshake(self._c_object)
 
584
        
 
585
        def send(self, data):
 
586
            data = bytes(data)
 
587
            data_len = len(data)
 
588
            while data_len > 0:
 
589
                data_len -= gnutls.record_send(self._c_object,
 
590
                                               data[-data_len:],
 
591
                                               data_len)
 
592
        
 
593
        def bye(self):
 
594
            return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)
 
595
    
 
596
    # Error handling functions
 
597
    def _error_code(result):
 
598
        """A function to raise exceptions on errors, suitable
 
599
        for the 'restype' attribute on ctypes functions"""
 
600
        if result >= 0:
 
601
            return result
 
602
        if result == gnutls.E_NO_CERTIFICATE_FOUND:
 
603
            raise gnutls.CertificateSecurityError(code = result)
 
604
        raise gnutls.Error(code = result)
 
605
    
 
606
    def _retry_on_error(result, func, arguments):
 
607
        """A function to retry on some errors, suitable
 
608
        for the 'errcheck' attribute on ctypes functions"""
 
609
        while result < 0:
 
610
            if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):
 
611
                return _error_code(result)
 
612
            result = func(*arguments)
 
613
        return result
 
614
    
 
615
    # Unless otherwise indicated, the function declarations below are
 
616
    # all from the gnutls/gnutls.h C header file.
 
617
    
 
618
    # Functions
 
619
    priority_set_direct = _library.gnutls_priority_set_direct
 
620
    priority_set_direct.argtypes = [session_t, ctypes.c_char_p,
 
621
                                    ctypes.POINTER(ctypes.c_char_p)]
 
622
    priority_set_direct.restype = _error_code
 
623
    
 
624
    init = _library.gnutls_init
 
625
    init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]
 
626
    init.restype = _error_code
 
627
    
 
628
    set_default_priority = _library.gnutls_set_default_priority
 
629
    set_default_priority.argtypes = [session_t]
 
630
    set_default_priority.restype = _error_code
 
631
    
 
632
    record_send = _library.gnutls_record_send
 
633
    record_send.argtypes = [session_t, ctypes.c_void_p,
 
634
                            ctypes.c_size_t]
 
635
    record_send.restype = ctypes.c_ssize_t
 
636
    record_send.errcheck = _retry_on_error
 
637
    
 
638
    certificate_allocate_credentials = (
 
639
        _library.gnutls_certificate_allocate_credentials)
 
640
    certificate_allocate_credentials.argtypes = [
 
641
        ctypes.POINTER(certificate_credentials_t)]
 
642
    certificate_allocate_credentials.restype = _error_code
 
643
    
 
644
    certificate_free_credentials = (
 
645
        _library.gnutls_certificate_free_credentials)
 
646
    certificate_free_credentials.argtypes = [certificate_credentials_t]
 
647
    certificate_free_credentials.restype = None
 
648
    
 
649
    handshake_set_private_extensions = (
 
650
        _library.gnutls_handshake_set_private_extensions)
 
651
    handshake_set_private_extensions.argtypes = [session_t,
 
652
                                                 ctypes.c_int]
 
653
    handshake_set_private_extensions.restype = None
 
654
    
 
655
    credentials_set = _library.gnutls_credentials_set
 
656
    credentials_set.argtypes = [session_t, credentials_type_t,
 
657
                                ctypes.c_void_p]
 
658
    credentials_set.restype = _error_code
 
659
    
 
660
    strerror = _library.gnutls_strerror
 
661
    strerror.argtypes = [ctypes.c_int]
 
662
    strerror.restype = ctypes.c_char_p
 
663
    
 
664
    certificate_type_get = _library.gnutls_certificate_type_get
 
665
    certificate_type_get.argtypes = [session_t]
 
666
    certificate_type_get.restype = _error_code
 
667
    
 
668
    certificate_get_peers = _library.gnutls_certificate_get_peers
 
669
    certificate_get_peers.argtypes = [session_t,
 
670
                                      ctypes.POINTER(ctypes.c_uint)]
 
671
    certificate_get_peers.restype = ctypes.POINTER(datum_t)
 
672
    
 
673
    global_set_log_level = _library.gnutls_global_set_log_level
 
674
    global_set_log_level.argtypes = [ctypes.c_int]
 
675
    global_set_log_level.restype = None
 
676
    
 
677
    global_set_log_function = _library.gnutls_global_set_log_function
 
678
    global_set_log_function.argtypes = [log_func]
 
679
    global_set_log_function.restype = None
 
680
    
 
681
    deinit = _library.gnutls_deinit
 
682
    deinit.argtypes = [session_t]
 
683
    deinit.restype = None
 
684
    
 
685
    handshake = _library.gnutls_handshake
 
686
    handshake.argtypes = [session_t]
 
687
    handshake.restype = _error_code
 
688
    handshake.errcheck = _retry_on_error
 
689
    
 
690
    transport_set_ptr = _library.gnutls_transport_set_ptr
 
691
    transport_set_ptr.argtypes = [session_t, transport_ptr_t]
 
692
    transport_set_ptr.restype = None
 
693
    
 
694
    bye = _library.gnutls_bye
 
695
    bye.argtypes = [session_t, close_request_t]
 
696
    bye.restype = _error_code
 
697
    bye.errcheck = _retry_on_error
 
698
    
 
699
    check_version = _library.gnutls_check_version
 
700
    check_version.argtypes = [ctypes.c_char_p]
 
701
    check_version.restype = ctypes.c_char_p
 
702
    
 
703
    # All the function declarations below are from gnutls/openpgp.h
 
704
    
 
705
    openpgp_crt_init = _library.gnutls_openpgp_crt_init
 
706
    openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]
 
707
    openpgp_crt_init.restype = _error_code
 
708
    
 
709
    openpgp_crt_import = _library.gnutls_openpgp_crt_import
 
710
    openpgp_crt_import.argtypes = [openpgp_crt_t,
 
711
                                   ctypes.POINTER(datum_t),
 
712
                                   openpgp_crt_fmt_t]
 
713
    openpgp_crt_import.restype = _error_code
 
714
    
 
715
    openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self
 
716
    openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,
 
717
                                        ctypes.POINTER(ctypes.c_uint)]
 
718
    openpgp_crt_verify_self.restype = _error_code
 
719
    
 
720
    openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit
 
721
    openpgp_crt_deinit.argtypes = [openpgp_crt_t]
 
722
    openpgp_crt_deinit.restype = None
 
723
    
 
724
    openpgp_crt_get_fingerprint = (
 
725
        _library.gnutls_openpgp_crt_get_fingerprint)
 
726
    openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,
 
727
                                            ctypes.c_void_p,
 
728
                                            ctypes.POINTER(
 
729
                                                ctypes.c_size_t)]
 
730
    openpgp_crt_get_fingerprint.restype = _error_code
 
731
    
 
732
    # Remove non-public functions
 
733
    del _error_code, _retry_on_error
 
734
# Create the global "gnutls" object, simulating a module
 
735
gnutls = GnuTLS()
 
736
 
 
737
def call_pipe(connection,       # : multiprocessing.Connection
 
738
              func, *args, **kwargs):
 
739
    """This function is meant to be called by multiprocessing.Process
 
740
    
 
741
    This function runs func(*args, **kwargs), and writes the resulting
 
742
    return value on the provided multiprocessing.Connection.
 
743
    """
 
744
    connection.send(func(*args, **kwargs))
 
745
    connection.close()
171
746
 
172
747
class Client(object):
173
748
    """A representation of a client host served by this server.
 
749
    
174
750
    Attributes:
175
 
    name:      string; from the config file, used in log messages
 
751
    approved:   bool(); 'None' if not yet approved/disapproved
 
752
    approval_delay: datetime.timedelta(); Time to wait for approval
 
753
    approval_duration: datetime.timedelta(); Duration of one approval
 
754
    checker:    subprocess.Popen(); a running checker process used
 
755
                                    to see if the client lives.
 
756
                                    'None' if no process is running.
 
757
    checker_callback_tag: a GLib event source tag, or None
 
758
    checker_command: string; External command which is run to check
 
759
                     if client lives.  %() expansions are done at
 
760
                     runtime with vars(self) as dict, so that for
 
761
                     instance %(name)s can be used in the command.
 
762
    checker_initiator_tag: a GLib event source tag, or None
 
763
    created:    datetime.datetime(); (UTC) object creation
 
764
    client_structure: Object describing what attributes a client has
 
765
                      and is used for storing the client at exit
 
766
    current_checker_command: string; current running checker_command
 
767
    disable_initiator_tag: a GLib event source tag, or None
 
768
    enabled:    bool()
176
769
    fingerprint: string (40 or 32 hexadecimal digits); used to
177
770
                 uniquely identify the client
178
 
    secret:    bytestring; sent verbatim (over TLS) to client
179
 
    host:      string; available for use by the checker command
180
 
    created:   datetime.datetime(); object creation, not client host
181
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
182
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
183
 
                                     until this client is invalid
184
 
    interval:  datetime.timedelta(); How often to start a new checker
185
 
    stop_hook: If set, called by stop() as stop_hook(self)
186
 
    checker:   subprocess.Popen(); a running checker process used
187
 
                                   to see if the client lives.
188
 
                                   'None' if no process is running.
189
 
    checker_initiator_tag: a gobject event source tag, or None
190
 
    stop_initiator_tag:    - '' -
191
 
    checker_callback_tag:  - '' -
192
 
    checker_command: string; External command which is run to check if
193
 
                     client lives.  %() expansions are done at
194
 
                     runtime with vars(self) as dict, so that for
195
 
                     instance %(name)s can be used in the command.
196
 
    Private attibutes:
197
 
    _timeout: Real variable for 'timeout'
198
 
    _interval: Real variable for 'interval'
199
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
200
 
    _interval_milliseconds: - '' -
 
771
    host:       string; available for use by the checker command
 
772
    interval:   datetime.timedelta(); How often to start a new checker
 
773
    last_approval_request: datetime.datetime(); (UTC) or None
 
774
    last_checked_ok: datetime.datetime(); (UTC) or None
 
775
    last_checker_status: integer between 0 and 255 reflecting exit
 
776
                         status of last checker. -1 reflects crashed
 
777
                         checker, -2 means no checker completed yet.
 
778
    last_checker_signal: The signal which killed the last checker, if
 
779
                         last_checker_status is -1
 
780
    last_enabled: datetime.datetime(); (UTC) or None
 
781
    name:       string; from the config file, used in log messages and
 
782
                        D-Bus identifiers
 
783
    secret:     bytestring; sent verbatim (over TLS) to client
 
784
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
785
                                      until this client is disabled
 
786
    extended_timeout:   extra long timeout when secret has been sent
 
787
    runtime_expansions: Allowed attributes for runtime expansion.
 
788
    expires:    datetime.datetime(); time (UTC) when a client will be
 
789
                disabled, or None
 
790
    server_settings: The server_settings dict from main()
201
791
    """
202
 
    def _set_timeout(self, timeout):
203
 
        "Setter function for 'timeout' attribute"
204
 
        self._timeout = timeout
205
 
        self._timeout_milliseconds = ((self.timeout.days
206
 
                                       * 24 * 60 * 60 * 1000)
207
 
                                      + (self.timeout.seconds * 1000)
208
 
                                      + (self.timeout.microseconds
209
 
                                         // 1000))
210
 
    timeout = property(lambda self: self._timeout,
211
 
                       _set_timeout)
212
 
    del _set_timeout
213
 
    def _set_interval(self, interval):
214
 
        "Setter function for 'interval' attribute"
215
 
        self._interval = interval
216
 
        self._interval_milliseconds = ((self.interval.days
217
 
                                        * 24 * 60 * 60 * 1000)
218
 
                                       + (self.interval.seconds
219
 
                                          * 1000)
220
 
                                       + (self.interval.microseconds
221
 
                                          // 1000))
222
 
    interval = property(lambda self: self._interval,
223
 
                        _set_interval)
224
 
    del _set_interval
225
 
    def __init__(self, name = None, stop_hook=None, config={}):
226
 
        """Note: the 'checker' key in 'config' sets the
227
 
        'checker_command' attribute and *not* the 'checker'
228
 
        attribute."""
 
792
    
 
793
    runtime_expansions = ("approval_delay", "approval_duration",
 
794
                          "created", "enabled", "expires",
 
795
                          "fingerprint", "host", "interval",
 
796
                          "last_approval_request", "last_checked_ok",
 
797
                          "last_enabled", "name", "timeout")
 
798
    client_defaults = {
 
799
        "timeout": "PT5M",
 
800
        "extended_timeout": "PT15M",
 
801
        "interval": "PT2M",
 
802
        "checker": "fping -q -- %%(host)s",
 
803
        "host": "",
 
804
        "approval_delay": "PT0S",
 
805
        "approval_duration": "PT1S",
 
806
        "approved_by_default": "True",
 
807
        "enabled": "True",
 
808
    }
 
809
    
 
810
    @staticmethod
 
811
    def config_parser(config):
 
812
        """Construct a new dict of client settings of this form:
 
813
        { client_name: {setting_name: value, ...}, ...}
 
814
        with exceptions for any special settings as defined above.
 
815
        NOTE: Must be a pure function. Must return the same result
 
816
        value given the same arguments.
 
817
        """
 
818
        settings = {}
 
819
        for client_name in config.sections():
 
820
            section = dict(config.items(client_name))
 
821
            client = settings[client_name] = {}
 
822
            
 
823
            client["host"] = section["host"]
 
824
            # Reformat values from string types to Python types
 
825
            client["approved_by_default"] = config.getboolean(
 
826
                client_name, "approved_by_default")
 
827
            client["enabled"] = config.getboolean(client_name,
 
828
                                                  "enabled")
 
829
            
 
830
            # Uppercase and remove spaces from fingerprint for later
 
831
            # comparison purposes with return value from the
 
832
            # fingerprint() function
 
833
            client["fingerprint"] = (section["fingerprint"].upper()
 
834
                                     .replace(" ", ""))
 
835
            if "secret" in section:
 
836
                client["secret"] = codecs.decode(section["secret"]
 
837
                                                 .encode("utf-8"),
 
838
                                                 "base64")
 
839
            elif "secfile" in section:
 
840
                with open(os.path.expanduser(os.path.expandvars
 
841
                                             (section["secfile"])),
 
842
                          "rb") as secfile:
 
843
                    client["secret"] = secfile.read()
 
844
            else:
 
845
                raise TypeError("No secret or secfile for section {}"
 
846
                                .format(section))
 
847
            client["timeout"] = string_to_delta(section["timeout"])
 
848
            client["extended_timeout"] = string_to_delta(
 
849
                section["extended_timeout"])
 
850
            client["interval"] = string_to_delta(section["interval"])
 
851
            client["approval_delay"] = string_to_delta(
 
852
                section["approval_delay"])
 
853
            client["approval_duration"] = string_to_delta(
 
854
                section["approval_duration"])
 
855
            client["checker_command"] = section["checker"]
 
856
            client["last_approval_request"] = None
 
857
            client["last_checked_ok"] = None
 
858
            client["last_checker_status"] = -2
 
859
        
 
860
        return settings
 
861
    
 
862
    def __init__(self, settings, name = None, server_settings=None):
229
863
        self.name = name
230
 
        logger.debug(u"Creating client %r", self.name)
231
 
        # Uppercase and remove spaces from fingerprint for later
232
 
        # comparison purposes with return value from the fingerprint()
233
 
        # function
234
 
        self.fingerprint = config["fingerprint"].upper()\
235
 
                           .replace(u" ", u"")
236
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
237
 
        if "secret" in config:
238
 
            self.secret = config["secret"].decode(u"base64")
239
 
        elif "secfile" in config:
240
 
            sf = open(config["secfile"])
241
 
            self.secret = sf.read()
242
 
            sf.close()
 
864
        if server_settings is None:
 
865
            server_settings = {}
 
866
        self.server_settings = server_settings
 
867
        # adding all client settings
 
868
        for setting, value in settings.items():
 
869
            setattr(self, setting, value)
 
870
        
 
871
        if self.enabled:
 
872
            if not hasattr(self, "last_enabled"):
 
873
                self.last_enabled = datetime.datetime.utcnow()
 
874
            if not hasattr(self, "expires"):
 
875
                self.expires = (datetime.datetime.utcnow()
 
876
                                + self.timeout)
243
877
        else:
244
 
            raise TypeError(u"No secret or secfile for client %s"
245
 
                            % self.name)
246
 
        self.host = config.get("host", "")
247
 
        self.created = datetime.datetime.now()
248
 
        self.last_checked_ok = None
249
 
        self.timeout = string_to_delta(config["timeout"])
250
 
        self.interval = string_to_delta(config["interval"])
251
 
        self.stop_hook = stop_hook
 
878
            self.last_enabled = None
 
879
            self.expires = None
 
880
        
 
881
        logger.debug("Creating client %r", self.name)
 
882
        logger.debug("  Fingerprint: %s", self.fingerprint)
 
883
        self.created = settings.get("created",
 
884
                                    datetime.datetime.utcnow())
 
885
        
 
886
        # attributes specific for this server instance
252
887
        self.checker = None
253
888
        self.checker_initiator_tag = None
254
 
        self.stop_initiator_tag = None
 
889
        self.disable_initiator_tag = None
255
890
        self.checker_callback_tag = None
256
 
        self.check_command = config["checker"]
257
 
    def start(self):
 
891
        self.current_checker_command = None
 
892
        self.approved = None
 
893
        self.approvals_pending = 0
 
894
        self.changedstate = multiprocessing_manager.Condition(
 
895
            multiprocessing_manager.Lock())
 
896
        self.client_structure = [attr
 
897
                                 for attr in self.__dict__.keys()
 
898
                                 if not attr.startswith("_")]
 
899
        self.client_structure.append("client_structure")
 
900
        
 
901
        for name, t in inspect.getmembers(
 
902
                type(self), lambda obj: isinstance(obj, property)):
 
903
            if not name.startswith("_"):
 
904
                self.client_structure.append(name)
 
905
    
 
906
    # Send notice to process children that client state has changed
 
907
    def send_changedstate(self):
 
908
        with self.changedstate:
 
909
            self.changedstate.notify_all()
 
910
    
 
911
    def enable(self):
258
912
        """Start this client's checker and timeout hooks"""
 
913
        if getattr(self, "enabled", False):
 
914
            # Already enabled
 
915
            return
 
916
        self.expires = datetime.datetime.utcnow() + self.timeout
 
917
        self.enabled = True
 
918
        self.last_enabled = datetime.datetime.utcnow()
 
919
        self.init_checker()
 
920
        self.send_changedstate()
 
921
    
 
922
    def disable(self, quiet=True):
 
923
        """Disable this client."""
 
924
        if not getattr(self, "enabled", False):
 
925
            return False
 
926
        if not quiet:
 
927
            logger.info("Disabling client %s", self.name)
 
928
        if getattr(self, "disable_initiator_tag", None) is not None:
 
929
            GLib.source_remove(self.disable_initiator_tag)
 
930
            self.disable_initiator_tag = None
 
931
        self.expires = None
 
932
        if getattr(self, "checker_initiator_tag", None) is not None:
 
933
            GLib.source_remove(self.checker_initiator_tag)
 
934
            self.checker_initiator_tag = None
 
935
        self.stop_checker()
 
936
        self.enabled = False
 
937
        if not quiet:
 
938
            self.send_changedstate()
 
939
        # Do not run this again if called by a GLib.timeout_add
 
940
        return False
 
941
    
 
942
    def __del__(self):
 
943
        self.disable()
 
944
    
 
945
    def init_checker(self):
259
946
        # Schedule a new checker to be started an 'interval' from now,
260
947
        # and every interval from then on.
261
 
        self.checker_initiator_tag = gobject.timeout_add\
262
 
                                     (self._interval_milliseconds,
263
 
                                      self.start_checker)
 
948
        if self.checker_initiator_tag is not None:
 
949
            GLib.source_remove(self.checker_initiator_tag)
 
950
        self.checker_initiator_tag = GLib.timeout_add(
 
951
            int(self.interval.total_seconds() * 1000),
 
952
            self.start_checker)
 
953
        # Schedule a disable() when 'timeout' has passed
 
954
        if self.disable_initiator_tag is not None:
 
955
            GLib.source_remove(self.disable_initiator_tag)
 
956
        self.disable_initiator_tag = GLib.timeout_add(
 
957
            int(self.timeout.total_seconds() * 1000), self.disable)
264
958
        # Also start a new checker *right now*.
265
959
        self.start_checker()
266
 
        # Schedule a stop() when 'timeout' has passed
267
 
        self.stop_initiator_tag = gobject.timeout_add\
268
 
                                  (self._timeout_milliseconds,
269
 
                                   self.stop)
270
 
    def stop(self):
271
 
        """Stop this client.
272
 
        The possibility that a client might be restarted is left open,
273
 
        but not currently used."""
274
 
        # If this client doesn't have a secret, it is already stopped.
275
 
        if hasattr(self, "secret") and self.secret:
276
 
            logger.info(u"Stopping client %s", self.name)
277
 
            self.secret = None
278
 
        else:
279
 
            return False
280
 
        if getattr(self, "stop_initiator_tag", False):
281
 
            gobject.source_remove(self.stop_initiator_tag)
282
 
            self.stop_initiator_tag = None
283
 
        if getattr(self, "checker_initiator_tag", False):
284
 
            gobject.source_remove(self.checker_initiator_tag)
285
 
            self.checker_initiator_tag = None
286
 
        self.stop_checker()
287
 
        if self.stop_hook:
288
 
            self.stop_hook(self)
289
 
        # Do not run this again if called by a gobject.timeout_add
290
 
        return False
291
 
    def __del__(self):
292
 
        self.stop_hook = None
293
 
        self.stop()
294
 
    def checker_callback(self, pid, condition):
 
960
    
 
961
    def checker_callback(self, source, condition, connection,
 
962
                         command):
295
963
        """The checker has completed, so take appropriate actions."""
296
 
        now = datetime.datetime.now()
297
964
        self.checker_callback_tag = None
298
965
        self.checker = None
299
 
        if os.WIFEXITED(condition) \
300
 
               and (os.WEXITSTATUS(condition) == 0):
301
 
            logger.info(u"Checker for %(name)s succeeded",
302
 
                        vars(self))
303
 
            self.last_checked_ok = now
304
 
            gobject.source_remove(self.stop_initiator_tag)
305
 
            self.stop_initiator_tag = gobject.timeout_add\
306
 
                                      (self._timeout_milliseconds,
307
 
                                       self.stop)
308
 
        elif not os.WIFEXITED(condition):
309
 
            logger.warning(u"Checker for %(name)s crashed?",
 
966
        # Read return code from connection (see call_pipe)
 
967
        returncode = connection.recv()
 
968
        connection.close()
 
969
        
 
970
        if returncode >= 0:
 
971
            self.last_checker_status = returncode
 
972
            self.last_checker_signal = None
 
973
            if self.last_checker_status == 0:
 
974
                logger.info("Checker for %(name)s succeeded",
 
975
                            vars(self))
 
976
                self.checked_ok()
 
977
            else:
 
978
                logger.info("Checker for %(name)s failed", vars(self))
 
979
        else:
 
980
            self.last_checker_status = -1
 
981
            self.last_checker_signal = -returncode
 
982
            logger.warning("Checker for %(name)s crashed?",
310
983
                           vars(self))
311
 
        else:
312
 
            logger.info(u"Checker for %(name)s failed",
313
 
                        vars(self))
 
984
        return False
 
985
    
 
986
    def checked_ok(self):
 
987
        """Assert that the client has been seen, alive and well."""
 
988
        self.last_checked_ok = datetime.datetime.utcnow()
 
989
        self.last_checker_status = 0
 
990
        self.last_checker_signal = None
 
991
        self.bump_timeout()
 
992
    
 
993
    def bump_timeout(self, timeout=None):
 
994
        """Bump up the timeout for this client."""
 
995
        if timeout is None:
 
996
            timeout = self.timeout
 
997
        if self.disable_initiator_tag is not None:
 
998
            GLib.source_remove(self.disable_initiator_tag)
 
999
            self.disable_initiator_tag = None
 
1000
        if getattr(self, "enabled", False):
 
1001
            self.disable_initiator_tag = GLib.timeout_add(
 
1002
                int(timeout.total_seconds() * 1000), self.disable)
 
1003
            self.expires = datetime.datetime.utcnow() + timeout
 
1004
    
 
1005
    def need_approval(self):
 
1006
        self.last_approval_request = datetime.datetime.utcnow()
 
1007
    
314
1008
    def start_checker(self):
315
1009
        """Start a new checker subprocess if one is not running.
 
1010
        
316
1011
        If a checker already exists, leave it running and do
317
1012
        nothing."""
318
1013
        # The reason for not killing a running checker is that if we
319
 
        # did that, then if a checker (for some reason) started
320
 
        # running slowly and taking more than 'interval' time, the
321
 
        # client would inevitably timeout, since no checker would get
322
 
        # a chance to run to completion.  If we instead leave running
 
1014
        # did that, and if a checker (for some reason) started running
 
1015
        # slowly and taking more than 'interval' time, then the client
 
1016
        # would inevitably timeout, since no checker would get a
 
1017
        # chance to run to completion.  If we instead leave running
323
1018
        # checkers alone, the checker would have to take more time
324
 
        # than 'timeout' for the client to be declared invalid, which
325
 
        # is as it should be.
 
1019
        # than 'timeout' for the client to be disabled, which is as it
 
1020
        # should be.
 
1021
        
 
1022
        if self.checker is not None and not self.checker.is_alive():
 
1023
            logger.warning("Checker was not alive; joining")
 
1024
            self.checker.join()
 
1025
            self.checker = None
 
1026
        # Start a new checker if needed
326
1027
        if self.checker is None:
327
 
            try:
328
 
                # In case check_command has exactly one % operator
329
 
                command = self.check_command % self.host
330
 
            except TypeError:
331
 
                # Escape attributes for the shell
332
 
                escaped_attrs = dict((key, re.escape(str(val)))
333
 
                                     for key, val in
334
 
                                     vars(self).iteritems())
335
 
                try:
336
 
                    command = self.check_command % escaped_attrs
337
 
                except TypeError, error:
338
 
                    logger.error(u'Could not format string "%s":'
339
 
                                 u' %s', self.check_command, error)
340
 
                    return True # Try again later
341
 
            try:
342
 
                logger.info(u"Starting checker %r for %s",
343
 
                            command, self.name)
344
 
                # We don't need to redirect stdout and stderr, since
345
 
                # in normal mode, that is already done by daemon(),
346
 
                # and in debug mode we don't want to.  (Stdin is
347
 
                # always replaced by /dev/null.)
348
 
                self.checker = subprocess.Popen(command,
349
 
                                                close_fds=True,
350
 
                                                shell=True, cwd="/")
351
 
                self.checker_callback_tag = gobject.child_watch_add\
352
 
                                            (self.checker.pid,
353
 
                                             self.checker_callback)
354
 
            except OSError, error:
355
 
                logger.error(u"Failed to start subprocess: %s",
356
 
                             error)
357
 
        # Re-run this periodically if run by gobject.timeout_add
 
1028
            # Escape attributes for the shell
 
1029
            escaped_attrs = {
 
1030
                attr: re.escape(str(getattr(self, attr)))
 
1031
                for attr in self.runtime_expansions }
 
1032
            try:
 
1033
                command = self.checker_command % escaped_attrs
 
1034
            except TypeError as error:
 
1035
                logger.error('Could not format string "%s"',
 
1036
                             self.checker_command,
 
1037
                             exc_info=error)
 
1038
                return True     # Try again later
 
1039
            self.current_checker_command = command
 
1040
            logger.info("Starting checker %r for %s", command,
 
1041
                        self.name)
 
1042
            # We don't need to redirect stdout and stderr, since
 
1043
            # in normal mode, that is already done by daemon(),
 
1044
            # and in debug mode we don't want to.  (Stdin is
 
1045
            # always replaced by /dev/null.)
 
1046
            # The exception is when not debugging but nevertheless
 
1047
            # running in the foreground; use the previously
 
1048
            # created wnull.
 
1049
            popen_args = { "close_fds": True,
 
1050
                           "shell": True,
 
1051
                           "cwd": "/" }
 
1052
            if (not self.server_settings["debug"]
 
1053
                and self.server_settings["foreground"]):
 
1054
                popen_args.update({"stdout": wnull,
 
1055
                                   "stderr": wnull })
 
1056
            pipe = multiprocessing.Pipe(duplex = False)
 
1057
            self.checker = multiprocessing.Process(
 
1058
                target = call_pipe,
 
1059
                args = (pipe[1], subprocess.call, command),
 
1060
                kwargs = popen_args)
 
1061
            self.checker.start()
 
1062
            self.checker_callback_tag = GLib.io_add_watch(
 
1063
                pipe[0].fileno(), GLib.IO_IN,
 
1064
                self.checker_callback, pipe[0], command)
 
1065
        # Re-run this periodically if run by GLib.timeout_add
358
1066
        return True
 
1067
    
359
1068
    def stop_checker(self):
360
1069
        """Force the checker process, if any, to stop."""
361
1070
        if self.checker_callback_tag:
362
 
            gobject.source_remove(self.checker_callback_tag)
 
1071
            GLib.source_remove(self.checker_callback_tag)
363
1072
            self.checker_callback_tag = None
364
1073
        if getattr(self, "checker", None) is None:
365
1074
            return
366
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
367
 
        try:
368
 
            os.kill(self.checker.pid, signal.SIGTERM)
369
 
            #os.sleep(0.5)
370
 
            #if self.checker.poll() is None:
371
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
372
 
        except OSError, error:
373
 
            if error.errno != errno.ESRCH: # No such process
374
 
                raise
 
1075
        logger.debug("Stopping checker for %(name)s", vars(self))
 
1076
        self.checker.terminate()
375
1077
        self.checker = None
376
 
    def still_valid(self):
377
 
        """Has the timeout not yet passed for this client?"""
378
 
        now = datetime.datetime.now()
379
 
        if self.last_checked_ok is None:
380
 
            return now < (self.created + self.timeout)
381
 
        else:
382
 
            return now < (self.last_checked_ok + self.timeout)
383
 
 
384
 
 
385
 
def peer_certificate(session):
386
 
    "Return the peer's OpenPGP certificate as a bytestring"
387
 
    # If not an OpenPGP certificate...
388
 
    if gnutls.library.functions.gnutls_certificate_type_get\
389
 
            (session._c_object) \
390
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
391
 
        # ...do the normal thing
392
 
        return session.peer_certificate
393
 
    list_size = ctypes.c_uint()
394
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
395
 
        (session._c_object, ctypes.byref(list_size))
396
 
    if list_size.value == 0:
397
 
        return None
398
 
    cert = cert_list[0]
399
 
    return ctypes.string_at(cert.data, cert.size)
400
 
 
401
 
 
402
 
def fingerprint(openpgp):
403
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
404
 
    # New GnuTLS "datum" with the OpenPGP public key
405
 
    datum = gnutls.library.types.gnutls_datum_t\
406
 
        (ctypes.cast(ctypes.c_char_p(openpgp),
407
 
                     ctypes.POINTER(ctypes.c_ubyte)),
408
 
         ctypes.c_uint(len(openpgp)))
409
 
    # New empty GnuTLS certificate
410
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
411
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
412
 
        (ctypes.byref(crt))
413
 
    # Import the OpenPGP public key into the certificate
414
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
415
 
                    (crt, ctypes.byref(datum),
416
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
417
 
    # Verify the self signature in the key
418
 
    crtverify = ctypes.c_uint();
419
 
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
420
 
        (crt, 0, ctypes.byref(crtverify))
421
 
    if crtverify.value != 0:
422
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
423
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
424
 
    # New buffer for the fingerprint
425
 
    buffer = ctypes.create_string_buffer(20)
426
 
    buffer_length = ctypes.c_size_t()
427
 
    # Get the fingerprint from the certificate into the buffer
428
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
429
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
430
 
    # Deinit the certificate
431
 
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
432
 
    # Convert the buffer to a Python bytestring
433
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
434
 
    # Convert the bytestring to hexadecimal notation
435
 
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
436
 
    return hex_fpr
437
 
 
438
 
 
439
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
440
 
    """A TCP request handler class.
441
 
    Instantiated by IPv6_TCPServer for each request to handle it.
 
1078
 
 
1079
 
 
1080
def dbus_service_property(dbus_interface,
 
1081
                          signature="v",
 
1082
                          access="readwrite",
 
1083
                          byte_arrays=False):
 
1084
    """Decorators for marking methods of a DBusObjectWithProperties to
 
1085
    become properties on the D-Bus.
 
1086
    
 
1087
    The decorated method will be called with no arguments by "Get"
 
1088
    and with one argument by "Set".
 
1089
    
 
1090
    The parameters, where they are supported, are the same as
 
1091
    dbus.service.method, except there is only "signature", since the
 
1092
    type from Get() and the type sent to Set() is the same.
 
1093
    """
 
1094
    # Encoding deeply encoded byte arrays is not supported yet by the
 
1095
    # "Set" method, so we fail early here:
 
1096
    if byte_arrays and signature != "ay":
 
1097
        raise ValueError("Byte arrays not supported for non-'ay'"
 
1098
                         " signature {!r}".format(signature))
 
1099
    
 
1100
    def decorator(func):
 
1101
        func._dbus_is_property = True
 
1102
        func._dbus_interface = dbus_interface
 
1103
        func._dbus_signature = signature
 
1104
        func._dbus_access = access
 
1105
        func._dbus_name = func.__name__
 
1106
        if func._dbus_name.endswith("_dbus_property"):
 
1107
            func._dbus_name = func._dbus_name[:-14]
 
1108
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
 
1109
        return func
 
1110
    
 
1111
    return decorator
 
1112
 
 
1113
 
 
1114
def dbus_interface_annotations(dbus_interface):
 
1115
    """Decorator for marking functions returning interface annotations
 
1116
    
 
1117
    Usage:
 
1118
    
 
1119
    @dbus_interface_annotations("org.example.Interface")
 
1120
    def _foo(self):  # Function name does not matter
 
1121
        return {"org.freedesktop.DBus.Deprecated": "true",
 
1122
                "org.freedesktop.DBus.Property.EmitsChangedSignal":
 
1123
                    "false"}
 
1124
    """
 
1125
    
 
1126
    def decorator(func):
 
1127
        func._dbus_is_interface = True
 
1128
        func._dbus_interface = dbus_interface
 
1129
        func._dbus_name = dbus_interface
 
1130
        return func
 
1131
    
 
1132
    return decorator
 
1133
 
 
1134
 
 
1135
def dbus_annotations(annotations):
 
1136
    """Decorator to annotate D-Bus methods, signals or properties
 
1137
    Usage:
 
1138
    
 
1139
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true",
 
1140
                       "org.freedesktop.DBus.Property."
 
1141
                       "EmitsChangedSignal": "false"})
 
1142
    @dbus_service_property("org.example.Interface", signature="b",
 
1143
                           access="r")
 
1144
    def Property_dbus_property(self):
 
1145
        return dbus.Boolean(False)
 
1146
    
 
1147
    See also the DBusObjectWithAnnotations class.
 
1148
    """
 
1149
    
 
1150
    def decorator(func):
 
1151
        func._dbus_annotations = annotations
 
1152
        return func
 
1153
    
 
1154
    return decorator
 
1155
 
 
1156
 
 
1157
class DBusPropertyException(dbus.exceptions.DBusException):
 
1158
    """A base class for D-Bus property-related exceptions
 
1159
    """
 
1160
    pass
 
1161
 
 
1162
 
 
1163
class DBusPropertyAccessException(DBusPropertyException):
 
1164
    """A property's access permissions disallows an operation.
 
1165
    """
 
1166
    pass
 
1167
 
 
1168
 
 
1169
class DBusPropertyNotFound(DBusPropertyException):
 
1170
    """An attempt was made to access a non-existing property.
 
1171
    """
 
1172
    pass
 
1173
 
 
1174
 
 
1175
class DBusObjectWithAnnotations(dbus.service.Object):
 
1176
    """A D-Bus object with annotations.
 
1177
    
 
1178
    Classes inheriting from this can use the dbus_annotations
 
1179
    decorator to add annotations to methods or signals.
 
1180
    """
 
1181
    
 
1182
    @staticmethod
 
1183
    def _is_dbus_thing(thing):
 
1184
        """Returns a function testing if an attribute is a D-Bus thing
 
1185
        
 
1186
        If called like _is_dbus_thing("method") it returns a function
 
1187
        suitable for use as predicate to inspect.getmembers().
 
1188
        """
 
1189
        return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),
 
1190
                                   False)
 
1191
    
 
1192
    def _get_all_dbus_things(self, thing):
 
1193
        """Returns a generator of (name, attribute) pairs
 
1194
        """
 
1195
        return ((getattr(athing.__get__(self), "_dbus_name", name),
 
1196
                 athing.__get__(self))
 
1197
                for cls in self.__class__.__mro__
 
1198
                for name, athing in
 
1199
                inspect.getmembers(cls, self._is_dbus_thing(thing)))
 
1200
    
 
1201
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
1202
                         out_signature = "s",
 
1203
                         path_keyword = 'object_path',
 
1204
                         connection_keyword = 'connection')
 
1205
    def Introspect(self, object_path, connection):
 
1206
        """Overloading of standard D-Bus method.
 
1207
        
 
1208
        Inserts annotation tags on methods and signals.
 
1209
        """
 
1210
        xmlstring = dbus.service.Object.Introspect(self, object_path,
 
1211
                                                   connection)
 
1212
        try:
 
1213
            document = xml.dom.minidom.parseString(xmlstring)
 
1214
            
 
1215
            for if_tag in document.getElementsByTagName("interface"):
 
1216
                # Add annotation tags
 
1217
                for typ in ("method", "signal"):
 
1218
                    for tag in if_tag.getElementsByTagName(typ):
 
1219
                        annots = dict()
 
1220
                        for name, prop in (self.
 
1221
                                           _get_all_dbus_things(typ)):
 
1222
                            if (name == tag.getAttribute("name")
 
1223
                                and prop._dbus_interface
 
1224
                                == if_tag.getAttribute("name")):
 
1225
                                annots.update(getattr(
 
1226
                                    prop, "_dbus_annotations", {}))
 
1227
                        for name, value in annots.items():
 
1228
                            ann_tag = document.createElement(
 
1229
                                "annotation")
 
1230
                            ann_tag.setAttribute("name", name)
 
1231
                            ann_tag.setAttribute("value", value)
 
1232
                            tag.appendChild(ann_tag)
 
1233
                # Add interface annotation tags
 
1234
                for annotation, value in dict(
 
1235
                    itertools.chain.from_iterable(
 
1236
                        annotations().items()
 
1237
                        for name, annotations
 
1238
                        in self._get_all_dbus_things("interface")
 
1239
                        if name == if_tag.getAttribute("name")
 
1240
                        )).items():
 
1241
                    ann_tag = document.createElement("annotation")
 
1242
                    ann_tag.setAttribute("name", annotation)
 
1243
                    ann_tag.setAttribute("value", value)
 
1244
                    if_tag.appendChild(ann_tag)
 
1245
                # Fix argument name for the Introspect method itself
 
1246
                if (if_tag.getAttribute("name")
 
1247
                                == dbus.INTROSPECTABLE_IFACE):
 
1248
                    for cn in if_tag.getElementsByTagName("method"):
 
1249
                        if cn.getAttribute("name") == "Introspect":
 
1250
                            for arg in cn.getElementsByTagName("arg"):
 
1251
                                if (arg.getAttribute("direction")
 
1252
                                    == "out"):
 
1253
                                    arg.setAttribute("name",
 
1254
                                                     "xml_data")
 
1255
            xmlstring = document.toxml("utf-8")
 
1256
            document.unlink()
 
1257
        except (AttributeError, xml.dom.DOMException,
 
1258
                xml.parsers.expat.ExpatError) as error:
 
1259
            logger.error("Failed to override Introspection method",
 
1260
                         exc_info=error)
 
1261
        return xmlstring
 
1262
 
 
1263
 
 
1264
class DBusObjectWithProperties(DBusObjectWithAnnotations):
 
1265
    """A D-Bus object with properties.
 
1266
    
 
1267
    Classes inheriting from this can use the dbus_service_property
 
1268
    decorator to expose methods as D-Bus properties.  It exposes the
 
1269
    standard Get(), Set(), and GetAll() methods on the D-Bus.
 
1270
    """
 
1271
    
 
1272
    def _get_dbus_property(self, interface_name, property_name):
 
1273
        """Returns a bound method if one exists which is a D-Bus
 
1274
        property with the specified name and interface.
 
1275
        """
 
1276
        for cls in self.__class__.__mro__:
 
1277
            for name, value in inspect.getmembers(
 
1278
                    cls, self._is_dbus_thing("property")):
 
1279
                if (value._dbus_name == property_name
 
1280
                    and value._dbus_interface == interface_name):
 
1281
                    return value.__get__(self)
 
1282
        
 
1283
        # No such property
 
1284
        raise DBusPropertyNotFound("{}:{}.{}".format(
 
1285
            self.dbus_object_path, interface_name, property_name))
 
1286
    
 
1287
    @classmethod
 
1288
    def _get_all_interface_names(cls):
 
1289
        """Get a sequence of all interfaces supported by an object"""
 
1290
        return (name for name in set(getattr(getattr(x, attr),
 
1291
                                             "_dbus_interface", None)
 
1292
                                     for x in (inspect.getmro(cls))
 
1293
                                     for attr in dir(x))
 
1294
                if name is not None)
 
1295
    
 
1296
    @dbus.service.method(dbus.PROPERTIES_IFACE,
 
1297
                         in_signature="ss",
 
1298
                         out_signature="v")
 
1299
    def Get(self, interface_name, property_name):
 
1300
        """Standard D-Bus property Get() method, see D-Bus standard.
 
1301
        """
 
1302
        prop = self._get_dbus_property(interface_name, property_name)
 
1303
        if prop._dbus_access == "write":
 
1304
            raise DBusPropertyAccessException(property_name)
 
1305
        value = prop()
 
1306
        if not hasattr(value, "variant_level"):
 
1307
            return value
 
1308
        return type(value)(value, variant_level=value.variant_level+1)
 
1309
    
 
1310
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
 
1311
    def Set(self, interface_name, property_name, value):
 
1312
        """Standard D-Bus property Set() method, see D-Bus standard.
 
1313
        """
 
1314
        prop = self._get_dbus_property(interface_name, property_name)
 
1315
        if prop._dbus_access == "read":
 
1316
            raise DBusPropertyAccessException(property_name)
 
1317
        if prop._dbus_get_args_options["byte_arrays"]:
 
1318
            # The byte_arrays option is not supported yet on
 
1319
            # signatures other than "ay".
 
1320
            if prop._dbus_signature != "ay":
 
1321
                raise ValueError("Byte arrays not supported for non-"
 
1322
                                 "'ay' signature {!r}"
 
1323
                                 .format(prop._dbus_signature))
 
1324
            value = dbus.ByteArray(b''.join(chr(byte)
 
1325
                                            for byte in value))
 
1326
        prop(value)
 
1327
    
 
1328
    @dbus.service.method(dbus.PROPERTIES_IFACE,
 
1329
                         in_signature="s",
 
1330
                         out_signature="a{sv}")
 
1331
    def GetAll(self, interface_name):
 
1332
        """Standard D-Bus property GetAll() method, see D-Bus
 
1333
        standard.
 
1334
        
 
1335
        Note: Will not include properties with access="write".
 
1336
        """
 
1337
        properties = {}
 
1338
        for name, prop in self._get_all_dbus_things("property"):
 
1339
            if (interface_name
 
1340
                and interface_name != prop._dbus_interface):
 
1341
                # Interface non-empty but did not match
 
1342
                continue
 
1343
            # Ignore write-only properties
 
1344
            if prop._dbus_access == "write":
 
1345
                continue
 
1346
            value = prop()
 
1347
            if not hasattr(value, "variant_level"):
 
1348
                properties[name] = value
 
1349
                continue
 
1350
            properties[name] = type(value)(
 
1351
                value, variant_level = value.variant_level + 1)
 
1352
        return dbus.Dictionary(properties, signature="sv")
 
1353
    
 
1354
    @dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")
 
1355
    def PropertiesChanged(self, interface_name, changed_properties,
 
1356
                          invalidated_properties):
 
1357
        """Standard D-Bus PropertiesChanged() signal, see D-Bus
 
1358
        standard.
 
1359
        """
 
1360
        pass
 
1361
    
 
1362
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
1363
                         out_signature="s",
 
1364
                         path_keyword='object_path',
 
1365
                         connection_keyword='connection')
 
1366
    def Introspect(self, object_path, connection):
 
1367
        """Overloading of standard D-Bus method.
 
1368
        
 
1369
        Inserts property tags and interface annotation tags.
 
1370
        """
 
1371
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
 
1372
                                                         object_path,
 
1373
                                                         connection)
 
1374
        try:
 
1375
            document = xml.dom.minidom.parseString(xmlstring)
 
1376
            
 
1377
            def make_tag(document, name, prop):
 
1378
                e = document.createElement("property")
 
1379
                e.setAttribute("name", name)
 
1380
                e.setAttribute("type", prop._dbus_signature)
 
1381
                e.setAttribute("access", prop._dbus_access)
 
1382
                return e
 
1383
            
 
1384
            for if_tag in document.getElementsByTagName("interface"):
 
1385
                # Add property tags
 
1386
                for tag in (make_tag(document, name, prop)
 
1387
                            for name, prop
 
1388
                            in self._get_all_dbus_things("property")
 
1389
                            if prop._dbus_interface
 
1390
                            == if_tag.getAttribute("name")):
 
1391
                    if_tag.appendChild(tag)
 
1392
                # Add annotation tags for properties
 
1393
                for tag in if_tag.getElementsByTagName("property"):
 
1394
                    annots = dict()
 
1395
                    for name, prop in self._get_all_dbus_things(
 
1396
                            "property"):
 
1397
                        if (name == tag.getAttribute("name")
 
1398
                            and prop._dbus_interface
 
1399
                            == if_tag.getAttribute("name")):
 
1400
                            annots.update(getattr(
 
1401
                                prop, "_dbus_annotations", {}))
 
1402
                    for name, value in annots.items():
 
1403
                        ann_tag = document.createElement(
 
1404
                            "annotation")
 
1405
                        ann_tag.setAttribute("name", name)
 
1406
                        ann_tag.setAttribute("value", value)
 
1407
                        tag.appendChild(ann_tag)
 
1408
                # Add the names to the return values for the
 
1409
                # "org.freedesktop.DBus.Properties" methods
 
1410
                if (if_tag.getAttribute("name")
 
1411
                    == "org.freedesktop.DBus.Properties"):
 
1412
                    for cn in if_tag.getElementsByTagName("method"):
 
1413
                        if cn.getAttribute("name") == "Get":
 
1414
                            for arg in cn.getElementsByTagName("arg"):
 
1415
                                if (arg.getAttribute("direction")
 
1416
                                    == "out"):
 
1417
                                    arg.setAttribute("name", "value")
 
1418
                        elif cn.getAttribute("name") == "GetAll":
 
1419
                            for arg in cn.getElementsByTagName("arg"):
 
1420
                                if (arg.getAttribute("direction")
 
1421
                                    == "out"):
 
1422
                                    arg.setAttribute("name", "props")
 
1423
            xmlstring = document.toxml("utf-8")
 
1424
            document.unlink()
 
1425
        except (AttributeError, xml.dom.DOMException,
 
1426
                xml.parsers.expat.ExpatError) as error:
 
1427
            logger.error("Failed to override Introspection method",
 
1428
                         exc_info=error)
 
1429
        return xmlstring
 
1430
 
 
1431
try:
 
1432
    dbus.OBJECT_MANAGER_IFACE
 
1433
except AttributeError:
 
1434
    dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"
 
1435
 
 
1436
class DBusObjectWithObjectManager(DBusObjectWithAnnotations):
 
1437
    """A D-Bus object with an ObjectManager.
 
1438
    
 
1439
    Classes inheriting from this exposes the standard
 
1440
    GetManagedObjects call and the InterfacesAdded and
 
1441
    InterfacesRemoved signals on the standard
 
1442
    "org.freedesktop.DBus.ObjectManager" interface.
 
1443
    
 
1444
    Note: No signals are sent automatically; they must be sent
 
1445
    manually.
 
1446
    """
 
1447
    @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
 
1448
                         out_signature = "a{oa{sa{sv}}}")
 
1449
    def GetManagedObjects(self):
 
1450
        """This function must be overridden"""
 
1451
        raise NotImplementedError()
 
1452
    
 
1453
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,
 
1454
                         signature = "oa{sa{sv}}")
 
1455
    def InterfacesAdded(self, object_path, interfaces_and_properties):
 
1456
        pass
 
1457
    
 
1458
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature = "oas")
 
1459
    def InterfacesRemoved(self, object_path, interfaces):
 
1460
        pass
 
1461
    
 
1462
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
1463
                         out_signature = "s",
 
1464
                         path_keyword = 'object_path',
 
1465
                         connection_keyword = 'connection')
 
1466
    def Introspect(self, object_path, connection):
 
1467
        """Overloading of standard D-Bus method.
 
1468
        
 
1469
        Override return argument name of GetManagedObjects to be
 
1470
        "objpath_interfaces_and_properties"
 
1471
        """
 
1472
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
 
1473
                                                         object_path,
 
1474
                                                         connection)
 
1475
        try:
 
1476
            document = xml.dom.minidom.parseString(xmlstring)
 
1477
            
 
1478
            for if_tag in document.getElementsByTagName("interface"):
 
1479
                # Fix argument name for the GetManagedObjects method
 
1480
                if (if_tag.getAttribute("name")
 
1481
                                == dbus.OBJECT_MANAGER_IFACE):
 
1482
                    for cn in if_tag.getElementsByTagName("method"):
 
1483
                        if (cn.getAttribute("name")
 
1484
                            == "GetManagedObjects"):
 
1485
                            for arg in cn.getElementsByTagName("arg"):
 
1486
                                if (arg.getAttribute("direction")
 
1487
                                    == "out"):
 
1488
                                    arg.setAttribute(
 
1489
                                        "name",
 
1490
                                        "objpath_interfaces"
 
1491
                                        "_and_properties")
 
1492
            xmlstring = document.toxml("utf-8")
 
1493
            document.unlink()
 
1494
        except (AttributeError, xml.dom.DOMException,
 
1495
                xml.parsers.expat.ExpatError) as error:
 
1496
            logger.error("Failed to override Introspection method",
 
1497
                         exc_info = error)
 
1498
        return xmlstring
 
1499
 
 
1500
def datetime_to_dbus(dt, variant_level=0):
 
1501
    """Convert a UTC datetime.datetime() to a D-Bus type."""
 
1502
    if dt is None:
 
1503
        return dbus.String("", variant_level = variant_level)
 
1504
    return dbus.String(dt.isoformat(), variant_level=variant_level)
 
1505
 
 
1506
 
 
1507
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
 
1508
    """A class decorator; applied to a subclass of
 
1509
    dbus.service.Object, it will add alternate D-Bus attributes with
 
1510
    interface names according to the "alt_interface_names" mapping.
 
1511
    Usage:
 
1512
    
 
1513
    @alternate_dbus_interfaces({"org.example.Interface":
 
1514
                                    "net.example.AlternateInterface"})
 
1515
    class SampleDBusObject(dbus.service.Object):
 
1516
        @dbus.service.method("org.example.Interface")
 
1517
        def SampleDBusMethod():
 
1518
            pass
 
1519
    
 
1520
    The above "SampleDBusMethod" on "SampleDBusObject" will be
 
1521
    reachable via two interfaces: "org.example.Interface" and
 
1522
    "net.example.AlternateInterface", the latter of which will have
 
1523
    its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
 
1524
    "true", unless "deprecate" is passed with a False value.
 
1525
    
 
1526
    This works for methods and signals, and also for D-Bus properties
 
1527
    (from DBusObjectWithProperties) and interfaces (from the
 
1528
    dbus_interface_annotations decorator).
 
1529
    """
 
1530
    
 
1531
    def wrapper(cls):
 
1532
        for orig_interface_name, alt_interface_name in (
 
1533
                alt_interface_names.items()):
 
1534
            attr = {}
 
1535
            interface_names = set()
 
1536
            # Go though all attributes of the class
 
1537
            for attrname, attribute in inspect.getmembers(cls):
 
1538
                # Ignore non-D-Bus attributes, and D-Bus attributes
 
1539
                # with the wrong interface name
 
1540
                if (not hasattr(attribute, "_dbus_interface")
 
1541
                    or not attribute._dbus_interface.startswith(
 
1542
                        orig_interface_name)):
 
1543
                    continue
 
1544
                # Create an alternate D-Bus interface name based on
 
1545
                # the current name
 
1546
                alt_interface = attribute._dbus_interface.replace(
 
1547
                    orig_interface_name, alt_interface_name)
 
1548
                interface_names.add(alt_interface)
 
1549
                # Is this a D-Bus signal?
 
1550
                if getattr(attribute, "_dbus_is_signal", False):
 
1551
                    # Extract the original non-method undecorated
 
1552
                    # function by black magic
 
1553
                    if sys.version_info.major == 2:
 
1554
                        nonmethod_func = (dict(
 
1555
                            zip(attribute.func_code.co_freevars,
 
1556
                                attribute.__closure__))
 
1557
                                          ["func"].cell_contents)
 
1558
                    else:
 
1559
                        nonmethod_func = (dict(
 
1560
                            zip(attribute.__code__.co_freevars,
 
1561
                                attribute.__closure__))
 
1562
                                          ["func"].cell_contents)
 
1563
                    # Create a new, but exactly alike, function
 
1564
                    # object, and decorate it to be a new D-Bus signal
 
1565
                    # with the alternate D-Bus interface name
 
1566
                    new_function = copy_function(nonmethod_func)
 
1567
                    new_function = (dbus.service.signal(
 
1568
                        alt_interface,
 
1569
                        attribute._dbus_signature)(new_function))
 
1570
                    # Copy annotations, if any
 
1571
                    try:
 
1572
                        new_function._dbus_annotations = dict(
 
1573
                            attribute._dbus_annotations)
 
1574
                    except AttributeError:
 
1575
                        pass
 
1576
                    # Define a creator of a function to call both the
 
1577
                    # original and alternate functions, so both the
 
1578
                    # original and alternate signals gets sent when
 
1579
                    # the function is called
 
1580
                    def fixscope(func1, func2):
 
1581
                        """This function is a scope container to pass
 
1582
                        func1 and func2 to the "call_both" function
 
1583
                        outside of its arguments"""
 
1584
                        
 
1585
                        @functools.wraps(func2)
 
1586
                        def call_both(*args, **kwargs):
 
1587
                            """This function will emit two D-Bus
 
1588
                            signals by calling func1 and func2"""
 
1589
                            func1(*args, **kwargs)
 
1590
                            func2(*args, **kwargs)
 
1591
                        # Make wrapper function look like a D-Bus signal
 
1592
                        for name, attr in inspect.getmembers(func2):
 
1593
                            if name.startswith("_dbus_"):
 
1594
                                setattr(call_both, name, attr)
 
1595
                        
 
1596
                        return call_both
 
1597
                    # Create the "call_both" function and add it to
 
1598
                    # the class
 
1599
                    attr[attrname] = fixscope(attribute, new_function)
 
1600
                # Is this a D-Bus method?
 
1601
                elif getattr(attribute, "_dbus_is_method", False):
 
1602
                    # Create a new, but exactly alike, function
 
1603
                    # object.  Decorate it to be a new D-Bus method
 
1604
                    # with the alternate D-Bus interface name.  Add it
 
1605
                    # to the class.
 
1606
                    attr[attrname] = (
 
1607
                        dbus.service.method(
 
1608
                            alt_interface,
 
1609
                            attribute._dbus_in_signature,
 
1610
                            attribute._dbus_out_signature)
 
1611
                        (copy_function(attribute)))
 
1612
                    # Copy annotations, if any
 
1613
                    try:
 
1614
                        attr[attrname]._dbus_annotations = dict(
 
1615
                            attribute._dbus_annotations)
 
1616
                    except AttributeError:
 
1617
                        pass
 
1618
                # Is this a D-Bus property?
 
1619
                elif getattr(attribute, "_dbus_is_property", False):
 
1620
                    # Create a new, but exactly alike, function
 
1621
                    # object, and decorate it to be a new D-Bus
 
1622
                    # property with the alternate D-Bus interface
 
1623
                    # name.  Add it to the class.
 
1624
                    attr[attrname] = (dbus_service_property(
 
1625
                        alt_interface, attribute._dbus_signature,
 
1626
                        attribute._dbus_access,
 
1627
                        attribute._dbus_get_args_options
 
1628
                        ["byte_arrays"])
 
1629
                                      (copy_function(attribute)))
 
1630
                    # Copy annotations, if any
 
1631
                    try:
 
1632
                        attr[attrname]._dbus_annotations = dict(
 
1633
                            attribute._dbus_annotations)
 
1634
                    except AttributeError:
 
1635
                        pass
 
1636
                # Is this a D-Bus interface?
 
1637
                elif getattr(attribute, "_dbus_is_interface", False):
 
1638
                    # Create a new, but exactly alike, function
 
1639
                    # object.  Decorate it to be a new D-Bus interface
 
1640
                    # with the alternate D-Bus interface name.  Add it
 
1641
                    # to the class.
 
1642
                    attr[attrname] = (
 
1643
                        dbus_interface_annotations(alt_interface)
 
1644
                        (copy_function(attribute)))
 
1645
            if deprecate:
 
1646
                # Deprecate all alternate interfaces
 
1647
                iname="_AlternateDBusNames_interface_annotation{}"
 
1648
                for interface_name in interface_names:
 
1649
                    
 
1650
                    @dbus_interface_annotations(interface_name)
 
1651
                    def func(self):
 
1652
                        return { "org.freedesktop.DBus.Deprecated":
 
1653
                                 "true" }
 
1654
                    # Find an unused name
 
1655
                    for aname in (iname.format(i)
 
1656
                                  for i in itertools.count()):
 
1657
                        if aname not in attr:
 
1658
                            attr[aname] = func
 
1659
                            break
 
1660
            if interface_names:
 
1661
                # Replace the class with a new subclass of it with
 
1662
                # methods, signals, etc. as created above.
 
1663
                if sys.version_info.major == 2:
 
1664
                    cls = type(b"{}Alternate".format(cls.__name__),
 
1665
                               (cls, ), attr)
 
1666
                else:
 
1667
                    cls = type("{}Alternate".format(cls.__name__),
 
1668
                               (cls, ), attr)
 
1669
        return cls
 
1670
    
 
1671
    return wrapper
 
1672
 
 
1673
 
 
1674
@alternate_dbus_interfaces({"se.recompile.Mandos":
 
1675
                            "se.bsnet.fukt.Mandos"})
 
1676
class ClientDBus(Client, DBusObjectWithProperties):
 
1677
    """A Client class using D-Bus
 
1678
    
 
1679
    Attributes:
 
1680
    dbus_object_path: dbus.ObjectPath
 
1681
    bus: dbus.SystemBus()
 
1682
    """
 
1683
    
 
1684
    runtime_expansions = (Client.runtime_expansions
 
1685
                          + ("dbus_object_path", ))
 
1686
    
 
1687
    _interface = "se.recompile.Mandos.Client"
 
1688
    
 
1689
    # dbus.service.Object doesn't use super(), so we can't either.
 
1690
    
 
1691
    def __init__(self, bus = None, *args, **kwargs):
 
1692
        self.bus = bus
 
1693
        Client.__init__(self, *args, **kwargs)
 
1694
        # Only now, when this client is initialized, can it show up on
 
1695
        # the D-Bus
 
1696
        client_object_name = str(self.name).translate(
 
1697
            {ord("."): ord("_"),
 
1698
             ord("-"): ord("_")})
 
1699
        self.dbus_object_path = dbus.ObjectPath(
 
1700
            "/clients/" + client_object_name)
 
1701
        DBusObjectWithProperties.__init__(self, self.bus,
 
1702
                                          self.dbus_object_path)
 
1703
    
 
1704
    def notifychangeproperty(transform_func, dbus_name,
 
1705
                             type_func=lambda x: x,
 
1706
                             variant_level=1,
 
1707
                             invalidate_only=False,
 
1708
                             _interface=_interface):
 
1709
        """ Modify a variable so that it's a property which announces
 
1710
        its changes to DBus.
 
1711
        
 
1712
        transform_fun: Function that takes a value and a variant_level
 
1713
                       and transforms it to a D-Bus type.
 
1714
        dbus_name: D-Bus name of the variable
 
1715
        type_func: Function that transform the value before sending it
 
1716
                   to the D-Bus.  Default: no transform
 
1717
        variant_level: D-Bus variant level.  Default: 1
 
1718
        """
 
1719
        attrname = "_{}".format(dbus_name)
 
1720
        
 
1721
        def setter(self, value):
 
1722
            if hasattr(self, "dbus_object_path"):
 
1723
                if (not hasattr(self, attrname) or
 
1724
                    type_func(getattr(self, attrname, None))
 
1725
                    != type_func(value)):
 
1726
                    if invalidate_only:
 
1727
                        self.PropertiesChanged(
 
1728
                            _interface, dbus.Dictionary(),
 
1729
                            dbus.Array((dbus_name, )))
 
1730
                    else:
 
1731
                        dbus_value = transform_func(
 
1732
                            type_func(value),
 
1733
                            variant_level = variant_level)
 
1734
                        self.PropertyChanged(dbus.String(dbus_name),
 
1735
                                             dbus_value)
 
1736
                        self.PropertiesChanged(
 
1737
                            _interface,
 
1738
                            dbus.Dictionary({ dbus.String(dbus_name):
 
1739
                                              dbus_value }),
 
1740
                            dbus.Array())
 
1741
            setattr(self, attrname, value)
 
1742
        
 
1743
        return property(lambda self: getattr(self, attrname), setter)
 
1744
    
 
1745
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
 
1746
    approvals_pending = notifychangeproperty(dbus.Boolean,
 
1747
                                             "ApprovalPending",
 
1748
                                             type_func = bool)
 
1749
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
 
1750
    last_enabled = notifychangeproperty(datetime_to_dbus,
 
1751
                                        "LastEnabled")
 
1752
    checker = notifychangeproperty(
 
1753
        dbus.Boolean, "CheckerRunning",
 
1754
        type_func = lambda checker: checker is not None)
 
1755
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
 
1756
                                           "LastCheckedOK")
 
1757
    last_checker_status = notifychangeproperty(dbus.Int16,
 
1758
                                               "LastCheckerStatus")
 
1759
    last_approval_request = notifychangeproperty(
 
1760
        datetime_to_dbus, "LastApprovalRequest")
 
1761
    approved_by_default = notifychangeproperty(dbus.Boolean,
 
1762
                                               "ApprovedByDefault")
 
1763
    approval_delay = notifychangeproperty(
 
1764
        dbus.UInt64, "ApprovalDelay",
 
1765
        type_func = lambda td: td.total_seconds() * 1000)
 
1766
    approval_duration = notifychangeproperty(
 
1767
        dbus.UInt64, "ApprovalDuration",
 
1768
        type_func = lambda td: td.total_seconds() * 1000)
 
1769
    host = notifychangeproperty(dbus.String, "Host")
 
1770
    timeout = notifychangeproperty(
 
1771
        dbus.UInt64, "Timeout",
 
1772
        type_func = lambda td: td.total_seconds() * 1000)
 
1773
    extended_timeout = notifychangeproperty(
 
1774
        dbus.UInt64, "ExtendedTimeout",
 
1775
        type_func = lambda td: td.total_seconds() * 1000)
 
1776
    interval = notifychangeproperty(
 
1777
        dbus.UInt64, "Interval",
 
1778
        type_func = lambda td: td.total_seconds() * 1000)
 
1779
    checker_command = notifychangeproperty(dbus.String, "Checker")
 
1780
    secret = notifychangeproperty(dbus.ByteArray, "Secret",
 
1781
                                  invalidate_only=True)
 
1782
    
 
1783
    del notifychangeproperty
 
1784
    
 
1785
    def __del__(self, *args, **kwargs):
 
1786
        try:
 
1787
            self.remove_from_connection()
 
1788
        except LookupError:
 
1789
            pass
 
1790
        if hasattr(DBusObjectWithProperties, "__del__"):
 
1791
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
 
1792
        Client.__del__(self, *args, **kwargs)
 
1793
    
 
1794
    def checker_callback(self, source, condition,
 
1795
                         connection, command, *args, **kwargs):
 
1796
        ret = Client.checker_callback(self, source, condition,
 
1797
                                      connection, command, *args,
 
1798
                                      **kwargs)
 
1799
        exitstatus = self.last_checker_status
 
1800
        if exitstatus >= 0:
 
1801
            # Emit D-Bus signal
 
1802
            self.CheckerCompleted(dbus.Int16(exitstatus),
 
1803
                                  # This is specific to GNU libC
 
1804
                                  dbus.Int64(exitstatus << 8),
 
1805
                                  dbus.String(command))
 
1806
        else:
 
1807
            # Emit D-Bus signal
 
1808
            self.CheckerCompleted(dbus.Int16(-1),
 
1809
                                  dbus.Int64(
 
1810
                                      # This is specific to GNU libC
 
1811
                                      (exitstatus << 8)
 
1812
                                      | self.last_checker_signal),
 
1813
                                  dbus.String(command))
 
1814
        return ret
 
1815
    
 
1816
    def start_checker(self, *args, **kwargs):
 
1817
        old_checker_pid = getattr(self.checker, "pid", None)
 
1818
        r = Client.start_checker(self, *args, **kwargs)
 
1819
        # Only if new checker process was started
 
1820
        if (self.checker is not None
 
1821
            and old_checker_pid != self.checker.pid):
 
1822
            # Emit D-Bus signal
 
1823
            self.CheckerStarted(self.current_checker_command)
 
1824
        return r
 
1825
    
 
1826
    def _reset_approved(self):
 
1827
        self.approved = None
 
1828
        return False
 
1829
    
 
1830
    def approve(self, value=True):
 
1831
        self.approved = value
 
1832
        GLib.timeout_add(int(self.approval_duration.total_seconds()
 
1833
                             * 1000), self._reset_approved)
 
1834
        self.send_changedstate()
 
1835
    
 
1836
    ## D-Bus methods, signals & properties
 
1837
    
 
1838
    ## Interfaces
 
1839
    
 
1840
    ## Signals
 
1841
    
 
1842
    # CheckerCompleted - signal
 
1843
    @dbus.service.signal(_interface, signature="nxs")
 
1844
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
1845
        "D-Bus signal"
 
1846
        pass
 
1847
    
 
1848
    # CheckerStarted - signal
 
1849
    @dbus.service.signal(_interface, signature="s")
 
1850
    def CheckerStarted(self, command):
 
1851
        "D-Bus signal"
 
1852
        pass
 
1853
    
 
1854
    # PropertyChanged - signal
 
1855
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1856
    @dbus.service.signal(_interface, signature="sv")
 
1857
    def PropertyChanged(self, property, value):
 
1858
        "D-Bus signal"
 
1859
        pass
 
1860
    
 
1861
    # GotSecret - signal
 
1862
    @dbus.service.signal(_interface)
 
1863
    def GotSecret(self):
 
1864
        """D-Bus signal
 
1865
        Is sent after a successful transfer of secret from the Mandos
 
1866
        server to mandos-client
 
1867
        """
 
1868
        pass
 
1869
    
 
1870
    # Rejected - signal
 
1871
    @dbus.service.signal(_interface, signature="s")
 
1872
    def Rejected(self, reason):
 
1873
        "D-Bus signal"
 
1874
        pass
 
1875
    
 
1876
    # NeedApproval - signal
 
1877
    @dbus.service.signal(_interface, signature="tb")
 
1878
    def NeedApproval(self, timeout, default):
 
1879
        "D-Bus signal"
 
1880
        return self.need_approval()
 
1881
    
 
1882
    ## Methods
 
1883
    
 
1884
    # Approve - method
 
1885
    @dbus.service.method(_interface, in_signature="b")
 
1886
    def Approve(self, value):
 
1887
        self.approve(value)
 
1888
    
 
1889
    # CheckedOK - method
 
1890
    @dbus.service.method(_interface)
 
1891
    def CheckedOK(self):
 
1892
        self.checked_ok()
 
1893
    
 
1894
    # Enable - method
 
1895
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1896
    @dbus.service.method(_interface)
 
1897
    def Enable(self):
 
1898
        "D-Bus method"
 
1899
        self.enable()
 
1900
    
 
1901
    # StartChecker - method
 
1902
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1903
    @dbus.service.method(_interface)
 
1904
    def StartChecker(self):
 
1905
        "D-Bus method"
 
1906
        self.start_checker()
 
1907
    
 
1908
    # Disable - method
 
1909
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1910
    @dbus.service.method(_interface)
 
1911
    def Disable(self):
 
1912
        "D-Bus method"
 
1913
        self.disable()
 
1914
    
 
1915
    # StopChecker - method
 
1916
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1917
    @dbus.service.method(_interface)
 
1918
    def StopChecker(self):
 
1919
        self.stop_checker()
 
1920
    
 
1921
    ## Properties
 
1922
    
 
1923
    # ApprovalPending - property
 
1924
    @dbus_service_property(_interface, signature="b", access="read")
 
1925
    def ApprovalPending_dbus_property(self):
 
1926
        return dbus.Boolean(bool(self.approvals_pending))
 
1927
    
 
1928
    # ApprovedByDefault - property
 
1929
    @dbus_service_property(_interface,
 
1930
                           signature="b",
 
1931
                           access="readwrite")
 
1932
    def ApprovedByDefault_dbus_property(self, value=None):
 
1933
        if value is None:       # get
 
1934
            return dbus.Boolean(self.approved_by_default)
 
1935
        self.approved_by_default = bool(value)
 
1936
    
 
1937
    # ApprovalDelay - property
 
1938
    @dbus_service_property(_interface,
 
1939
                           signature="t",
 
1940
                           access="readwrite")
 
1941
    def ApprovalDelay_dbus_property(self, value=None):
 
1942
        if value is None:       # get
 
1943
            return dbus.UInt64(self.approval_delay.total_seconds()
 
1944
                               * 1000)
 
1945
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
 
1946
    
 
1947
    # ApprovalDuration - property
 
1948
    @dbus_service_property(_interface,
 
1949
                           signature="t",
 
1950
                           access="readwrite")
 
1951
    def ApprovalDuration_dbus_property(self, value=None):
 
1952
        if value is None:       # get
 
1953
            return dbus.UInt64(self.approval_duration.total_seconds()
 
1954
                               * 1000)
 
1955
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
 
1956
    
 
1957
    # Name - property
 
1958
    @dbus_annotations(
 
1959
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
 
1960
    @dbus_service_property(_interface, signature="s", access="read")
 
1961
    def Name_dbus_property(self):
 
1962
        return dbus.String(self.name)
 
1963
    
 
1964
    # Fingerprint - property
 
1965
    @dbus_annotations(
 
1966
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
 
1967
    @dbus_service_property(_interface, signature="s", access="read")
 
1968
    def Fingerprint_dbus_property(self):
 
1969
        return dbus.String(self.fingerprint)
 
1970
    
 
1971
    # Host - property
 
1972
    @dbus_service_property(_interface,
 
1973
                           signature="s",
 
1974
                           access="readwrite")
 
1975
    def Host_dbus_property(self, value=None):
 
1976
        if value is None:       # get
 
1977
            return dbus.String(self.host)
 
1978
        self.host = str(value)
 
1979
    
 
1980
    # Created - property
 
1981
    @dbus_annotations(
 
1982
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
 
1983
    @dbus_service_property(_interface, signature="s", access="read")
 
1984
    def Created_dbus_property(self):
 
1985
        return datetime_to_dbus(self.created)
 
1986
    
 
1987
    # LastEnabled - property
 
1988
    @dbus_service_property(_interface, signature="s", access="read")
 
1989
    def LastEnabled_dbus_property(self):
 
1990
        return datetime_to_dbus(self.last_enabled)
 
1991
    
 
1992
    # Enabled - property
 
1993
    @dbus_service_property(_interface,
 
1994
                           signature="b",
 
1995
                           access="readwrite")
 
1996
    def Enabled_dbus_property(self, value=None):
 
1997
        if value is None:       # get
 
1998
            return dbus.Boolean(self.enabled)
 
1999
        if value:
 
2000
            self.enable()
 
2001
        else:
 
2002
            self.disable()
 
2003
    
 
2004
    # LastCheckedOK - property
 
2005
    @dbus_service_property(_interface,
 
2006
                           signature="s",
 
2007
                           access="readwrite")
 
2008
    def LastCheckedOK_dbus_property(self, value=None):
 
2009
        if value is not None:
 
2010
            self.checked_ok()
 
2011
            return
 
2012
        return datetime_to_dbus(self.last_checked_ok)
 
2013
    
 
2014
    # LastCheckerStatus - property
 
2015
    @dbus_service_property(_interface, signature="n", access="read")
 
2016
    def LastCheckerStatus_dbus_property(self):
 
2017
        return dbus.Int16(self.last_checker_status)
 
2018
    
 
2019
    # Expires - property
 
2020
    @dbus_service_property(_interface, signature="s", access="read")
 
2021
    def Expires_dbus_property(self):
 
2022
        return datetime_to_dbus(self.expires)
 
2023
    
 
2024
    # LastApprovalRequest - property
 
2025
    @dbus_service_property(_interface, signature="s", access="read")
 
2026
    def LastApprovalRequest_dbus_property(self):
 
2027
        return datetime_to_dbus(self.last_approval_request)
 
2028
    
 
2029
    # Timeout - property
 
2030
    @dbus_service_property(_interface,
 
2031
                           signature="t",
 
2032
                           access="readwrite")
 
2033
    def Timeout_dbus_property(self, value=None):
 
2034
        if value is None:       # get
 
2035
            return dbus.UInt64(self.timeout.total_seconds() * 1000)
 
2036
        old_timeout = self.timeout
 
2037
        self.timeout = datetime.timedelta(0, 0, 0, value)
 
2038
        # Reschedule disabling
 
2039
        if self.enabled:
 
2040
            now = datetime.datetime.utcnow()
 
2041
            self.expires += self.timeout - old_timeout
 
2042
            if self.expires <= now:
 
2043
                # The timeout has passed
 
2044
                self.disable()
 
2045
            else:
 
2046
                if (getattr(self, "disable_initiator_tag", None)
 
2047
                    is None):
 
2048
                    return
 
2049
                GLib.source_remove(self.disable_initiator_tag)
 
2050
                self.disable_initiator_tag = GLib.timeout_add(
 
2051
                    int((self.expires - now).total_seconds() * 1000),
 
2052
                    self.disable)
 
2053
    
 
2054
    # ExtendedTimeout - property
 
2055
    @dbus_service_property(_interface,
 
2056
                           signature="t",
 
2057
                           access="readwrite")
 
2058
    def ExtendedTimeout_dbus_property(self, value=None):
 
2059
        if value is None:       # get
 
2060
            return dbus.UInt64(self.extended_timeout.total_seconds()
 
2061
                               * 1000)
 
2062
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
 
2063
    
 
2064
    # Interval - property
 
2065
    @dbus_service_property(_interface,
 
2066
                           signature="t",
 
2067
                           access="readwrite")
 
2068
    def Interval_dbus_property(self, value=None):
 
2069
        if value is None:       # get
 
2070
            return dbus.UInt64(self.interval.total_seconds() * 1000)
 
2071
        self.interval = datetime.timedelta(0, 0, 0, value)
 
2072
        if getattr(self, "checker_initiator_tag", None) is None:
 
2073
            return
 
2074
        if self.enabled:
 
2075
            # Reschedule checker run
 
2076
            GLib.source_remove(self.checker_initiator_tag)
 
2077
            self.checker_initiator_tag = GLib.timeout_add(
 
2078
                value, self.start_checker)
 
2079
            self.start_checker() # Start one now, too
 
2080
    
 
2081
    # Checker - property
 
2082
    @dbus_service_property(_interface,
 
2083
                           signature="s",
 
2084
                           access="readwrite")
 
2085
    def Checker_dbus_property(self, value=None):
 
2086
        if value is None:       # get
 
2087
            return dbus.String(self.checker_command)
 
2088
        self.checker_command = str(value)
 
2089
    
 
2090
    # CheckerRunning - property
 
2091
    @dbus_service_property(_interface,
 
2092
                           signature="b",
 
2093
                           access="readwrite")
 
2094
    def CheckerRunning_dbus_property(self, value=None):
 
2095
        if value is None:       # get
 
2096
            return dbus.Boolean(self.checker is not None)
 
2097
        if value:
 
2098
            self.start_checker()
 
2099
        else:
 
2100
            self.stop_checker()
 
2101
    
 
2102
    # ObjectPath - property
 
2103
    @dbus_annotations(
 
2104
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",
 
2105
         "org.freedesktop.DBus.Deprecated": "true"})
 
2106
    @dbus_service_property(_interface, signature="o", access="read")
 
2107
    def ObjectPath_dbus_property(self):
 
2108
        return self.dbus_object_path # is already a dbus.ObjectPath
 
2109
    
 
2110
    # Secret = property
 
2111
    @dbus_annotations(
 
2112
        {"org.freedesktop.DBus.Property.EmitsChangedSignal":
 
2113
         "invalidates"})
 
2114
    @dbus_service_property(_interface,
 
2115
                           signature="ay",
 
2116
                           access="write",
 
2117
                           byte_arrays=True)
 
2118
    def Secret_dbus_property(self, value):
 
2119
        self.secret = bytes(value)
 
2120
    
 
2121
    del _interface
 
2122
 
 
2123
 
 
2124
class ProxyClient(object):
 
2125
    def __init__(self, child_pipe, fpr, address):
 
2126
        self._pipe = child_pipe
 
2127
        self._pipe.send(('init', fpr, address))
 
2128
        if not self._pipe.recv():
 
2129
            raise KeyError(fpr)
 
2130
    
 
2131
    def __getattribute__(self, name):
 
2132
        if name == '_pipe':
 
2133
            return super(ProxyClient, self).__getattribute__(name)
 
2134
        self._pipe.send(('getattr', name))
 
2135
        data = self._pipe.recv()
 
2136
        if data[0] == 'data':
 
2137
            return data[1]
 
2138
        if data[0] == 'function':
 
2139
            
 
2140
            def func(*args, **kwargs):
 
2141
                self._pipe.send(('funcall', name, args, kwargs))
 
2142
                return self._pipe.recv()[1]
 
2143
            
 
2144
            return func
 
2145
    
 
2146
    def __setattr__(self, name, value):
 
2147
        if name == '_pipe':
 
2148
            return super(ProxyClient, self).__setattr__(name, value)
 
2149
        self._pipe.send(('setattr', name, value))
 
2150
 
 
2151
 
 
2152
class ClientHandler(socketserver.BaseRequestHandler, object):
 
2153
    """A class to handle client connections.
 
2154
    
 
2155
    Instantiated once for each connection to handle it.
442
2156
    Note: This will run in its own forked process."""
443
2157
    
444
2158
    def handle(self):
445
 
        logger.info(u"TCP connection from: %s",
446
 
                     unicode(self.client_address))
447
 
        session = gnutls.connection.ClientSession\
448
 
                  (self.request, gnutls.connection.X509Credentials())
449
 
        
450
 
        line = self.request.makefile().readline()
451
 
        logger.debug(u"Protocol version: %r", line)
452
 
        try:
453
 
            if int(line.strip().split()[0]) > 1:
454
 
                raise RuntimeError
455
 
        except (ValueError, IndexError, RuntimeError), error:
456
 
            logger.error(u"Unknown protocol version: %s", error)
457
 
            return
458
 
        
459
 
        # Note: gnutls.connection.X509Credentials is really a generic
460
 
        # GnuTLS certificate credentials object so long as no X.509
461
 
        # keys are added to it.  Therefore, we can use it here despite
462
 
        # using OpenPGP certificates.
463
 
        
464
 
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
465
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
466
 
        #                "+DHE-DSS"))
467
 
        priority = "NORMAL"             # Fallback default, since this
468
 
                                        # MUST be set.
469
 
        if self.server.settings["priority"]:
470
 
            priority = self.server.settings["priority"]
471
 
        gnutls.library.functions.gnutls_priority_set_direct\
472
 
            (session._c_object, priority, None);
473
 
        
474
 
        try:
475
 
            session.handshake()
476
 
        except gnutls.errors.GNUTLSError, error:
477
 
            logger.warning(u"Handshake failed: %s", error)
478
 
            # Do not run session.bye() here: the session is not
479
 
            # established.  Just abandon the request.
480
 
            return
481
 
        try:
482
 
            fpr = fingerprint(peer_certificate(session))
483
 
        except (TypeError, gnutls.errors.GNUTLSError), error:
484
 
            logger.warning(u"Bad certificate: %s", error)
485
 
            session.bye()
486
 
            return
487
 
        logger.debug(u"Fingerprint: %s", fpr)
488
 
        client = None
489
 
        for c in self.server.clients:
490
 
            if c.fingerprint == fpr:
491
 
                client = c
492
 
                break
493
 
        if not client:
494
 
            logger.warning(u"Client not found for fingerprint: %s",
495
 
                           fpr)
496
 
            session.bye()
497
 
            return
498
 
        # Have to check if client.still_valid(), since it is possible
499
 
        # that the client timed out while establishing the GnuTLS
500
 
        # session.
501
 
        if not client.still_valid():
502
 
            logger.warning(u"Client %(name)s is invalid",
503
 
                           vars(client))
504
 
            session.bye()
505
 
            return
506
 
        sent_size = 0
507
 
        while sent_size < len(client.secret):
508
 
            sent = session.send(client.secret[sent_size:])
509
 
            logger.debug(u"Sent: %d, remaining: %d",
510
 
                         sent, len(client.secret)
511
 
                         - (sent_size + sent))
512
 
            sent_size += sent
513
 
        session.bye()
514
 
 
515
 
 
516
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
517
 
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
2159
        with contextlib.closing(self.server.child_pipe) as child_pipe:
 
2160
            logger.info("TCP connection from: %s",
 
2161
                        str(self.client_address))
 
2162
            logger.debug("Pipe FD: %d",
 
2163
                         self.server.child_pipe.fileno())
 
2164
            
 
2165
            session = gnutls.ClientSession(self.request)
 
2166
            
 
2167
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
 
2168
            #                      "+AES-256-CBC", "+SHA1",
 
2169
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
 
2170
            #                      "+DHE-DSS"))
 
2171
            # Use a fallback default, since this MUST be set.
 
2172
            priority = self.server.gnutls_priority
 
2173
            if priority is None:
 
2174
                priority = "NORMAL"
 
2175
            gnutls.priority_set_direct(session._c_object, priority,
 
2176
                                       None)
 
2177
            
 
2178
            # Start communication using the Mandos protocol
 
2179
            # Get protocol number
 
2180
            line = self.request.makefile().readline()
 
2181
            logger.debug("Protocol version: %r", line)
 
2182
            try:
 
2183
                if int(line.strip().split()[0]) > 1:
 
2184
                    raise RuntimeError(line)
 
2185
            except (ValueError, IndexError, RuntimeError) as error:
 
2186
                logger.error("Unknown protocol version: %s", error)
 
2187
                return
 
2188
            
 
2189
            # Start GnuTLS connection
 
2190
            try:
 
2191
                session.handshake()
 
2192
            except gnutls.Error as error:
 
2193
                logger.warning("Handshake failed: %s", error)
 
2194
                # Do not run session.bye() here: the session is not
 
2195
                # established.  Just abandon the request.
 
2196
                return
 
2197
            logger.debug("Handshake succeeded")
 
2198
            
 
2199
            approval_required = False
 
2200
            try:
 
2201
                try:
 
2202
                    fpr = self.fingerprint(
 
2203
                        self.peer_certificate(session))
 
2204
                except (TypeError, gnutls.Error) as error:
 
2205
                    logger.warning("Bad certificate: %s", error)
 
2206
                    return
 
2207
                logger.debug("Fingerprint: %s", fpr)
 
2208
                
 
2209
                try:
 
2210
                    client = ProxyClient(child_pipe, fpr,
 
2211
                                         self.client_address)
 
2212
                except KeyError:
 
2213
                    return
 
2214
                
 
2215
                if client.approval_delay:
 
2216
                    delay = client.approval_delay
 
2217
                    client.approvals_pending += 1
 
2218
                    approval_required = True
 
2219
                
 
2220
                while True:
 
2221
                    if not client.enabled:
 
2222
                        logger.info("Client %s is disabled",
 
2223
                                    client.name)
 
2224
                        if self.server.use_dbus:
 
2225
                            # Emit D-Bus signal
 
2226
                            client.Rejected("Disabled")
 
2227
                        return
 
2228
                    
 
2229
                    if client.approved or not client.approval_delay:
 
2230
                        #We are approved or approval is disabled
 
2231
                        break
 
2232
                    elif client.approved is None:
 
2233
                        logger.info("Client %s needs approval",
 
2234
                                    client.name)
 
2235
                        if self.server.use_dbus:
 
2236
                            # Emit D-Bus signal
 
2237
                            client.NeedApproval(
 
2238
                                client.approval_delay.total_seconds()
 
2239
                                * 1000, client.approved_by_default)
 
2240
                    else:
 
2241
                        logger.warning("Client %s was not approved",
 
2242
                                       client.name)
 
2243
                        if self.server.use_dbus:
 
2244
                            # Emit D-Bus signal
 
2245
                            client.Rejected("Denied")
 
2246
                        return
 
2247
                    
 
2248
                    #wait until timeout or approved
 
2249
                    time = datetime.datetime.now()
 
2250
                    client.changedstate.acquire()
 
2251
                    client.changedstate.wait(delay.total_seconds())
 
2252
                    client.changedstate.release()
 
2253
                    time2 = datetime.datetime.now()
 
2254
                    if (time2 - time) >= delay:
 
2255
                        if not client.approved_by_default:
 
2256
                            logger.warning("Client %s timed out while"
 
2257
                                           " waiting for approval",
 
2258
                                           client.name)
 
2259
                            if self.server.use_dbus:
 
2260
                                # Emit D-Bus signal
 
2261
                                client.Rejected("Approval timed out")
 
2262
                            return
 
2263
                        else:
 
2264
                            break
 
2265
                    else:
 
2266
                        delay -= time2 - time
 
2267
                
 
2268
                try:
 
2269
                    session.send(client.secret)
 
2270
                except gnutls.Error as error:
 
2271
                    logger.warning("gnutls send failed",
 
2272
                                   exc_info = error)
 
2273
                    return
 
2274
                
 
2275
                logger.info("Sending secret to %s", client.name)
 
2276
                # bump the timeout using extended_timeout
 
2277
                client.bump_timeout(client.extended_timeout)
 
2278
                if self.server.use_dbus:
 
2279
                    # Emit D-Bus signal
 
2280
                    client.GotSecret()
 
2281
            
 
2282
            finally:
 
2283
                if approval_required:
 
2284
                    client.approvals_pending -= 1
 
2285
                try:
 
2286
                    session.bye()
 
2287
                except gnutls.Error as error:
 
2288
                    logger.warning("GnuTLS bye failed",
 
2289
                                   exc_info=error)
 
2290
    
 
2291
    @staticmethod
 
2292
    def peer_certificate(session):
 
2293
        "Return the peer's OpenPGP certificate as a bytestring"
 
2294
        # If not an OpenPGP certificate...
 
2295
        if (gnutls.certificate_type_get(session._c_object)
 
2296
            != gnutls.CRT_OPENPGP):
 
2297
            # ...return invalid data
 
2298
            return b""
 
2299
        list_size = ctypes.c_uint(1)
 
2300
        cert_list = (gnutls.certificate_get_peers
 
2301
                     (session._c_object, ctypes.byref(list_size)))
 
2302
        if not bool(cert_list) and list_size.value != 0:
 
2303
            raise gnutls.Error("error getting peer certificate")
 
2304
        if list_size.value == 0:
 
2305
            return None
 
2306
        cert = cert_list[0]
 
2307
        return ctypes.string_at(cert.data, cert.size)
 
2308
    
 
2309
    @staticmethod
 
2310
    def fingerprint(openpgp):
 
2311
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
 
2312
        # New GnuTLS "datum" with the OpenPGP public key
 
2313
        datum = gnutls.datum_t(
 
2314
            ctypes.cast(ctypes.c_char_p(openpgp),
 
2315
                        ctypes.POINTER(ctypes.c_ubyte)),
 
2316
            ctypes.c_uint(len(openpgp)))
 
2317
        # New empty GnuTLS certificate
 
2318
        crt = gnutls.openpgp_crt_t()
 
2319
        gnutls.openpgp_crt_init(ctypes.byref(crt))
 
2320
        # Import the OpenPGP public key into the certificate
 
2321
        gnutls.openpgp_crt_import(crt, ctypes.byref(datum),
 
2322
                                  gnutls.OPENPGP_FMT_RAW)
 
2323
        # Verify the self signature in the key
 
2324
        crtverify = ctypes.c_uint()
 
2325
        gnutls.openpgp_crt_verify_self(crt, 0,
 
2326
                                       ctypes.byref(crtverify))
 
2327
        if crtverify.value != 0:
 
2328
            gnutls.openpgp_crt_deinit(crt)
 
2329
            raise gnutls.CertificateSecurityError("Verify failed")
 
2330
        # New buffer for the fingerprint
 
2331
        buf = ctypes.create_string_buffer(20)
 
2332
        buf_len = ctypes.c_size_t()
 
2333
        # Get the fingerprint from the certificate into the buffer
 
2334
        gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
2335
                                           ctypes.byref(buf_len))
 
2336
        # Deinit the certificate
 
2337
        gnutls.openpgp_crt_deinit(crt)
 
2338
        # Convert the buffer to a Python bytestring
 
2339
        fpr = ctypes.string_at(buf, buf_len.value)
 
2340
        # Convert the bytestring to hexadecimal notation
 
2341
        hex_fpr = binascii.hexlify(fpr).upper()
 
2342
        return hex_fpr
 
2343
 
 
2344
 
 
2345
class MultiprocessingMixIn(object):
 
2346
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
 
2347
    
 
2348
    def sub_process_main(self, request, address):
 
2349
        try:
 
2350
            self.finish_request(request, address)
 
2351
        except Exception:
 
2352
            self.handle_error(request, address)
 
2353
        self.close_request(request)
 
2354
    
 
2355
    def process_request(self, request, address):
 
2356
        """Start a new process to process the request."""
 
2357
        proc = multiprocessing.Process(target = self.sub_process_main,
 
2358
                                       args = (request, address))
 
2359
        proc.start()
 
2360
        return proc
 
2361
 
 
2362
 
 
2363
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
 
2364
    """ adds a pipe to the MixIn """
 
2365
    
 
2366
    def process_request(self, request, client_address):
 
2367
        """Overrides and wraps the original process_request().
 
2368
        
 
2369
        This function creates a new pipe in self.pipe
 
2370
        """
 
2371
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
 
2372
        
 
2373
        proc = MultiprocessingMixIn.process_request(self, request,
 
2374
                                                    client_address)
 
2375
        self.child_pipe.close()
 
2376
        self.add_pipe(parent_pipe, proc)
 
2377
    
 
2378
    def add_pipe(self, parent_pipe, proc):
 
2379
        """Dummy function; override as necessary"""
 
2380
        raise NotImplementedError()
 
2381
 
 
2382
 
 
2383
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
 
2384
                     socketserver.TCPServer, object):
 
2385
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
2386
    
518
2387
    Attributes:
519
 
        settings:       Server settings
520
 
        clients:        Set() of Client objects
521
2388
        enabled:        Boolean; whether this server is activated yet
 
2389
        interface:      None or a network interface name (string)
 
2390
        use_ipv6:       Boolean; to use IPv6 or not
522
2391
    """
523
 
    address_family = socket.AF_INET6
524
 
    def __init__(self, *args, **kwargs):
525
 
        if "settings" in kwargs:
526
 
            self.settings = kwargs["settings"]
527
 
            del kwargs["settings"]
528
 
        if "clients" in kwargs:
529
 
            self.clients = kwargs["clients"]
530
 
            del kwargs["clients"]
531
 
        self.enabled = False
532
 
        return super(type(self), self).__init__(*args, **kwargs)
 
2392
    
 
2393
    def __init__(self, server_address, RequestHandlerClass,
 
2394
                 interface=None,
 
2395
                 use_ipv6=True,
 
2396
                 socketfd=None):
 
2397
        """If socketfd is set, use that file descriptor instead of
 
2398
        creating a new one with socket.socket().
 
2399
        """
 
2400
        self.interface = interface
 
2401
        if use_ipv6:
 
2402
            self.address_family = socket.AF_INET6
 
2403
        if socketfd is not None:
 
2404
            # Save the file descriptor
 
2405
            self.socketfd = socketfd
 
2406
            # Save the original socket.socket() function
 
2407
            self.socket_socket = socket.socket
 
2408
            # To implement --socket, we monkey patch socket.socket.
 
2409
            # 
 
2410
            # (When socketserver.TCPServer is a new-style class, we
 
2411
            # could make self.socket into a property instead of monkey
 
2412
            # patching socket.socket.)
 
2413
            # 
 
2414
            # Create a one-time-only replacement for socket.socket()
 
2415
            @functools.wraps(socket.socket)
 
2416
            def socket_wrapper(*args, **kwargs):
 
2417
                # Restore original function so subsequent calls are
 
2418
                # not affected.
 
2419
                socket.socket = self.socket_socket
 
2420
                del self.socket_socket
 
2421
                # This time only, return a new socket object from the
 
2422
                # saved file descriptor.
 
2423
                return socket.fromfd(self.socketfd, *args, **kwargs)
 
2424
            # Replace socket.socket() function with wrapper
 
2425
            socket.socket = socket_wrapper
 
2426
        # The socketserver.TCPServer.__init__ will call
 
2427
        # socket.socket(), which might be our replacement,
 
2428
        # socket_wrapper(), if socketfd was set.
 
2429
        socketserver.TCPServer.__init__(self, server_address,
 
2430
                                        RequestHandlerClass)
 
2431
    
533
2432
    def server_bind(self):
534
2433
        """This overrides the normal server_bind() function
535
2434
        to bind to an interface if one was specified, and also NOT to
536
2435
        bind to an address or port if they were not specified."""
537
 
        if self.settings["interface"]:
538
 
            # 25 is from /usr/include/asm-i486/socket.h
539
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
540
 
            try:
541
 
                self.socket.setsockopt(socket.SOL_SOCKET,
542
 
                                       SO_BINDTODEVICE,
543
 
                                       self.settings["interface"])
544
 
            except socket.error, error:
545
 
                if error[0] == errno.EPERM:
546
 
                    logger.error(u"No permission to"
547
 
                                 u" bind to interface %s",
548
 
                                 self.settings["interface"])
549
 
                else:
550
 
                    raise error
 
2436
        if self.interface is not None:
 
2437
            if SO_BINDTODEVICE is None:
 
2438
                logger.error("SO_BINDTODEVICE does not exist;"
 
2439
                             " cannot bind to interface %s",
 
2440
                             self.interface)
 
2441
            else:
 
2442
                try:
 
2443
                    self.socket.setsockopt(
 
2444
                        socket.SOL_SOCKET, SO_BINDTODEVICE,
 
2445
                        (self.interface + "\0").encode("utf-8"))
 
2446
                except socket.error as error:
 
2447
                    if error.errno == errno.EPERM:
 
2448
                        logger.error("No permission to bind to"
 
2449
                                     " interface %s", self.interface)
 
2450
                    elif error.errno == errno.ENOPROTOOPT:
 
2451
                        logger.error("SO_BINDTODEVICE not available;"
 
2452
                                     " cannot bind to interface %s",
 
2453
                                     self.interface)
 
2454
                    elif error.errno == errno.ENODEV:
 
2455
                        logger.error("Interface %s does not exist,"
 
2456
                                     " cannot bind", self.interface)
 
2457
                    else:
 
2458
                        raise
551
2459
        # Only bind(2) the socket if we really need to.
552
2460
        if self.server_address[0] or self.server_address[1]:
553
2461
            if not self.server_address[0]:
554
 
                in6addr_any = "::"
555
 
                self.server_address = (in6addr_any,
 
2462
                if self.address_family == socket.AF_INET6:
 
2463
                    any_address = "::" # in6addr_any
 
2464
                else:
 
2465
                    any_address = "0.0.0.0" # INADDR_ANY
 
2466
                self.server_address = (any_address,
556
2467
                                       self.server_address[1])
557
2468
            elif not self.server_address[1]:
558
 
                self.server_address = (self.server_address[0],
559
 
                                       0)
560
 
#                 if self.settings["interface"]:
 
2469
                self.server_address = (self.server_address[0], 0)
 
2470
#                 if self.interface:
561
2471
#                     self.server_address = (self.server_address[0],
562
2472
#                                            0, # port
563
2473
#                                            0, # flowinfo
564
2474
#                                            if_nametoindex
565
 
#                                            (self.settings
566
 
#                                             ["interface"]))
567
 
            return super(type(self), self).server_bind()
 
2475
#                                            (self.interface))
 
2476
            return socketserver.TCPServer.server_bind(self)
 
2477
 
 
2478
 
 
2479
class MandosServer(IPv6_TCPServer):
 
2480
    """Mandos server.
 
2481
    
 
2482
    Attributes:
 
2483
        clients:        set of Client objects
 
2484
        gnutls_priority GnuTLS priority string
 
2485
        use_dbus:       Boolean; to emit D-Bus signals or not
 
2486
    
 
2487
    Assumes a GLib.MainLoop event loop.
 
2488
    """
 
2489
    
 
2490
    def __init__(self, server_address, RequestHandlerClass,
 
2491
                 interface=None,
 
2492
                 use_ipv6=True,
 
2493
                 clients=None,
 
2494
                 gnutls_priority=None,
 
2495
                 use_dbus=True,
 
2496
                 socketfd=None):
 
2497
        self.enabled = False
 
2498
        self.clients = clients
 
2499
        if self.clients is None:
 
2500
            self.clients = {}
 
2501
        self.use_dbus = use_dbus
 
2502
        self.gnutls_priority = gnutls_priority
 
2503
        IPv6_TCPServer.__init__(self, server_address,
 
2504
                                RequestHandlerClass,
 
2505
                                interface = interface,
 
2506
                                use_ipv6 = use_ipv6,
 
2507
                                socketfd = socketfd)
 
2508
    
568
2509
    def server_activate(self):
569
2510
        if self.enabled:
570
 
            return super(type(self), self).server_activate()
 
2511
            return socketserver.TCPServer.server_activate(self)
 
2512
    
571
2513
    def enable(self):
572
2514
        self.enabled = True
 
2515
    
 
2516
    def add_pipe(self, parent_pipe, proc):
 
2517
        # Call "handle_ipc" for both data and EOF events
 
2518
        GLib.io_add_watch(
 
2519
            parent_pipe.fileno(),
 
2520
            GLib.IO_IN | GLib.IO_HUP,
 
2521
            functools.partial(self.handle_ipc,
 
2522
                              parent_pipe = parent_pipe,
 
2523
                              proc = proc))
 
2524
    
 
2525
    def handle_ipc(self, source, condition,
 
2526
                   parent_pipe=None,
 
2527
                   proc = None,
 
2528
                   client_object=None):
 
2529
        # error, or the other end of multiprocessing.Pipe has closed
 
2530
        if condition & (GLib.IO_ERR | GLib.IO_HUP):
 
2531
            # Wait for other process to exit
 
2532
            proc.join()
 
2533
            return False
 
2534
        
 
2535
        # Read a request from the child
 
2536
        request = parent_pipe.recv()
 
2537
        command = request[0]
 
2538
        
 
2539
        if command == 'init':
 
2540
            fpr = request[1]
 
2541
            address = request[2]
 
2542
            
 
2543
            for c in self.clients.values():
 
2544
                if c.fingerprint == fpr:
 
2545
                    client = c
 
2546
                    break
 
2547
            else:
 
2548
                logger.info("Client not found for fingerprint: %s, ad"
 
2549
                            "dress: %s", fpr, address)
 
2550
                if self.use_dbus:
 
2551
                    # Emit D-Bus signal
 
2552
                    mandos_dbus_service.ClientNotFound(fpr,
 
2553
                                                       address[0])
 
2554
                parent_pipe.send(False)
 
2555
                return False
 
2556
            
 
2557
            GLib.io_add_watch(
 
2558
                parent_pipe.fileno(),
 
2559
                GLib.IO_IN | GLib.IO_HUP,
 
2560
                functools.partial(self.handle_ipc,
 
2561
                                  parent_pipe = parent_pipe,
 
2562
                                  proc = proc,
 
2563
                                  client_object = client))
 
2564
            parent_pipe.send(True)
 
2565
            # remove the old hook in favor of the new above hook on
 
2566
            # same fileno
 
2567
            return False
 
2568
        if command == 'funcall':
 
2569
            funcname = request[1]
 
2570
            args = request[2]
 
2571
            kwargs = request[3]
 
2572
            
 
2573
            parent_pipe.send(('data', getattr(client_object,
 
2574
                                              funcname)(*args,
 
2575
                                                        **kwargs)))
 
2576
        
 
2577
        if command == 'getattr':
 
2578
            attrname = request[1]
 
2579
            if isinstance(client_object.__getattribute__(attrname),
 
2580
                          collections.Callable):
 
2581
                parent_pipe.send(('function', ))
 
2582
            else:
 
2583
                parent_pipe.send((
 
2584
                    'data', client_object.__getattribute__(attrname)))
 
2585
        
 
2586
        if command == 'setattr':
 
2587
            attrname = request[1]
 
2588
            value = request[2]
 
2589
            setattr(client_object, attrname, value)
 
2590
        
 
2591
        return True
 
2592
 
 
2593
 
 
2594
def rfc3339_duration_to_delta(duration):
 
2595
    """Parse an RFC 3339 "duration" and return a datetime.timedelta
 
2596
    
 
2597
    >>> rfc3339_duration_to_delta("P7D")
 
2598
    datetime.timedelta(7)
 
2599
    >>> rfc3339_duration_to_delta("PT60S")
 
2600
    datetime.timedelta(0, 60)
 
2601
    >>> rfc3339_duration_to_delta("PT60M")
 
2602
    datetime.timedelta(0, 3600)
 
2603
    >>> rfc3339_duration_to_delta("PT24H")
 
2604
    datetime.timedelta(1)
 
2605
    >>> rfc3339_duration_to_delta("P1W")
 
2606
    datetime.timedelta(7)
 
2607
    >>> rfc3339_duration_to_delta("PT5M30S")
 
2608
    datetime.timedelta(0, 330)
 
2609
    >>> rfc3339_duration_to_delta("P1DT3M20S")
 
2610
    datetime.timedelta(1, 200)
 
2611
    """
 
2612
    
 
2613
    # Parsing an RFC 3339 duration with regular expressions is not
 
2614
    # possible - there would have to be multiple places for the same
 
2615
    # values, like seconds.  The current code, while more esoteric, is
 
2616
    # cleaner without depending on a parsing library.  If Python had a
 
2617
    # built-in library for parsing we would use it, but we'd like to
 
2618
    # avoid excessive use of external libraries.
 
2619
    
 
2620
    # New type for defining tokens, syntax, and semantics all-in-one
 
2621
    Token = collections.namedtuple("Token", (
 
2622
        "regexp",  # To match token; if "value" is not None, must have
 
2623
                   # a "group" containing digits
 
2624
        "value",   # datetime.timedelta or None
 
2625
        "followers"))           # Tokens valid after this token
 
2626
    # RFC 3339 "duration" tokens, syntax, and semantics; taken from
 
2627
    # the "duration" ABNF definition in RFC 3339, Appendix A.
 
2628
    token_end = Token(re.compile(r"$"), None, frozenset())
 
2629
    token_second = Token(re.compile(r"(\d+)S"),
 
2630
                         datetime.timedelta(seconds=1),
 
2631
                         frozenset((token_end, )))
 
2632
    token_minute = Token(re.compile(r"(\d+)M"),
 
2633
                         datetime.timedelta(minutes=1),
 
2634
                         frozenset((token_second, token_end)))
 
2635
    token_hour = Token(re.compile(r"(\d+)H"),
 
2636
                       datetime.timedelta(hours=1),
 
2637
                       frozenset((token_minute, token_end)))
 
2638
    token_time = Token(re.compile(r"T"),
 
2639
                       None,
 
2640
                       frozenset((token_hour, token_minute,
 
2641
                                  token_second)))
 
2642
    token_day = Token(re.compile(r"(\d+)D"),
 
2643
                      datetime.timedelta(days=1),
 
2644
                      frozenset((token_time, token_end)))
 
2645
    token_month = Token(re.compile(r"(\d+)M"),
 
2646
                        datetime.timedelta(weeks=4),
 
2647
                        frozenset((token_day, token_end)))
 
2648
    token_year = Token(re.compile(r"(\d+)Y"),
 
2649
                       datetime.timedelta(weeks=52),
 
2650
                       frozenset((token_month, token_end)))
 
2651
    token_week = Token(re.compile(r"(\d+)W"),
 
2652
                       datetime.timedelta(weeks=1),
 
2653
                       frozenset((token_end, )))
 
2654
    token_duration = Token(re.compile(r"P"), None,
 
2655
                           frozenset((token_year, token_month,
 
2656
                                      token_day, token_time,
 
2657
                                      token_week)))
 
2658
    # Define starting values
 
2659
    value = datetime.timedelta() # Value so far
 
2660
    found_token = None
 
2661
    followers = frozenset((token_duration, )) # Following valid tokens
 
2662
    s = duration                # String left to parse
 
2663
    # Loop until end token is found
 
2664
    while found_token is not token_end:
 
2665
        # Search for any currently valid tokens
 
2666
        for token in followers:
 
2667
            match = token.regexp.match(s)
 
2668
            if match is not None:
 
2669
                # Token found
 
2670
                if token.value is not None:
 
2671
                    # Value found, parse digits
 
2672
                    factor = int(match.group(1), 10)
 
2673
                    # Add to value so far
 
2674
                    value += factor * token.value
 
2675
                # Strip token from string
 
2676
                s = token.regexp.sub("", s, 1)
 
2677
                # Go to found token
 
2678
                found_token = token
 
2679
                # Set valid next tokens
 
2680
                followers = found_token.followers
 
2681
                break
 
2682
        else:
 
2683
            # No currently valid tokens were found
 
2684
            raise ValueError("Invalid RFC 3339 duration: {!r}"
 
2685
                             .format(duration))
 
2686
    # End token found
 
2687
    return value
573
2688
 
574
2689
 
575
2690
def string_to_delta(interval):
576
2691
    """Parse a string and return a datetime.timedelta
577
 
 
 
2692
    
578
2693
    >>> string_to_delta('7d')
579
2694
    datetime.timedelta(7)
580
2695
    >>> string_to_delta('60s')
583
2698
    datetime.timedelta(0, 3600)
584
2699
    >>> string_to_delta('24h')
585
2700
    datetime.timedelta(1)
586
 
    >>> string_to_delta(u'1w')
 
2701
    >>> string_to_delta('1w')
587
2702
    datetime.timedelta(7)
588
2703
    >>> string_to_delta('5m 30s')
589
2704
    datetime.timedelta(0, 330)
590
2705
    """
 
2706
    
 
2707
    try:
 
2708
        return rfc3339_duration_to_delta(interval)
 
2709
    except ValueError:
 
2710
        pass
 
2711
    
591
2712
    timevalue = datetime.timedelta(0)
592
2713
    for s in interval.split():
593
2714
        try:
594
 
            suffix=unicode(s[-1])
595
 
            value=int(s[:-1])
596
 
            if suffix == u"d":
 
2715
            suffix = s[-1]
 
2716
            value = int(s[:-1])
 
2717
            if suffix == "d":
597
2718
                delta = datetime.timedelta(value)
598
 
            elif suffix == u"s":
 
2719
            elif suffix == "s":
599
2720
                delta = datetime.timedelta(0, value)
600
 
            elif suffix == u"m":
 
2721
            elif suffix == "m":
601
2722
                delta = datetime.timedelta(0, 0, 0, 0, value)
602
 
            elif suffix == u"h":
 
2723
            elif suffix == "h":
603
2724
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
604
 
            elif suffix == u"w":
 
2725
            elif suffix == "w":
605
2726
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
606
2727
            else:
607
 
                raise ValueError
608
 
        except (ValueError, IndexError):
609
 
            raise ValueError
 
2728
                raise ValueError("Unknown suffix {!r}".format(suffix))
 
2729
        except IndexError as e:
 
2730
            raise ValueError(*(e.args))
610
2731
        timevalue += delta
611
2732
    return timevalue
612
2733
 
613
2734
 
614
 
def server_state_changed(state):
615
 
    """Derived from the Avahi example code"""
616
 
    if state == avahi.SERVER_COLLISION:
617
 
        logger.error(u"Zeroconf server name collision")
618
 
        service.remove()
619
 
    elif state == avahi.SERVER_RUNNING:
620
 
        service.add()
621
 
 
622
 
 
623
 
def entry_group_state_changed(state, error):
624
 
    """Derived from the Avahi example code"""
625
 
    logger.debug(u"Avahi state change: %i", state)
626
 
    
627
 
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
628
 
        logger.debug(u"Zeroconf service established.")
629
 
    elif state == avahi.ENTRY_GROUP_COLLISION:
630
 
        logger.warning(u"Zeroconf service name collision.")
631
 
        service.rename()
632
 
    elif state == avahi.ENTRY_GROUP_FAILURE:
633
 
        logger.critical(u"Avahi: Error in group state changed %s",
634
 
                        unicode(error))
635
 
        raise AvahiGroupError("State changed: %s", str(error))
636
 
 
637
 
def if_nametoindex(interface):
638
 
    """Call the C function if_nametoindex(), or equivalent"""
639
 
    global if_nametoindex
640
 
    try:
641
 
        if "ctypes.util" not in sys.modules:
642
 
            import ctypes.util
643
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
644
 
            (ctypes.util.find_library("c")).if_nametoindex
645
 
    except (OSError, AttributeError):
646
 
        if "struct" not in sys.modules:
647
 
            import struct
648
 
        if "fcntl" not in sys.modules:
649
 
            import fcntl
650
 
        def if_nametoindex(interface):
651
 
            "Get an interface index the hard way, i.e. using fcntl()"
652
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
653
 
            s = socket.socket()
654
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
655
 
                                struct.pack("16s16x", interface))
656
 
            s.close()
657
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
658
 
            return interface_index
659
 
    return if_nametoindex(interface)
660
 
 
661
 
 
662
2735
def daemon(nochdir = False, noclose = False):
663
2736
    """See daemon(3).  Standard BSD Unix function.
 
2737
    
664
2738
    This should really exist as os.daemon, but it doesn't (yet)."""
665
2739
    if os.fork():
666
2740
        sys.exit()
671
2745
        sys.exit()
672
2746
    if not noclose:
673
2747
        # Close all standard open file descriptors
674
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
2748
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
675
2749
        if not stat.S_ISCHR(os.fstat(null).st_mode):
676
2750
            raise OSError(errno.ENODEV,
677
 
                          "/dev/null not a character device")
 
2751
                          "{} not a character device"
 
2752
                          .format(os.devnull))
678
2753
        os.dup2(null, sys.stdin.fileno())
679
2754
        os.dup2(null, sys.stdout.fileno())
680
2755
        os.dup2(null, sys.stderr.fileno())
683
2758
 
684
2759
 
685
2760
def main():
686
 
    global main_loop_started
687
 
    main_loop_started = False
688
 
    
689
 
    parser = OptionParser(version = "%%prog %s" % version)
690
 
    parser.add_option("-i", "--interface", type="string",
691
 
                      metavar="IF", help="Bind to interface IF")
692
 
    parser.add_option("-a", "--address", type="string",
693
 
                      help="Address to listen for requests on")
694
 
    parser.add_option("-p", "--port", type="int",
695
 
                      help="Port number to receive requests on")
696
 
    parser.add_option("--check", action="store_true", default=False,
697
 
                      help="Run self-test")
698
 
    parser.add_option("--debug", action="store_true",
699
 
                      help="Debug mode; run in foreground and log to"
700
 
                      " terminal")
701
 
    parser.add_option("--priority", type="string", help="GnuTLS"
702
 
                      " priority string (see GnuTLS documentation)")
703
 
    parser.add_option("--servicename", type="string", metavar="NAME",
704
 
                      help="Zeroconf service name")
705
 
    parser.add_option("--configdir", type="string",
706
 
                      default="/etc/mandos", metavar="DIR",
707
 
                      help="Directory to search for configuration"
708
 
                      " files")
709
 
    (options, args) = parser.parse_args()
 
2761
    
 
2762
    ##################################################################
 
2763
    # Parsing of options, both command line and config file
 
2764
    
 
2765
    parser = argparse.ArgumentParser()
 
2766
    parser.add_argument("-v", "--version", action="version",
 
2767
                        version = "%(prog)s {}".format(version),
 
2768
                        help="show version number and exit")
 
2769
    parser.add_argument("-i", "--interface", metavar="IF",
 
2770
                        help="Bind to interface IF")
 
2771
    parser.add_argument("-a", "--address",
 
2772
                        help="Address to listen for requests on")
 
2773
    parser.add_argument("-p", "--port", type=int,
 
2774
                        help="Port number to receive requests on")
 
2775
    parser.add_argument("--check", action="store_true",
 
2776
                        help="Run self-test")
 
2777
    parser.add_argument("--debug", action="store_true",
 
2778
                        help="Debug mode; run in foreground and log"
 
2779
                        " to terminal", default=None)
 
2780
    parser.add_argument("--debuglevel", metavar="LEVEL",
 
2781
                        help="Debug level for stdout output")
 
2782
    parser.add_argument("--priority", help="GnuTLS"
 
2783
                        " priority string (see GnuTLS documentation)")
 
2784
    parser.add_argument("--servicename",
 
2785
                        metavar="NAME", help="Zeroconf service name")
 
2786
    parser.add_argument("--configdir",
 
2787
                        default="/etc/mandos", metavar="DIR",
 
2788
                        help="Directory to search for configuration"
 
2789
                        " files")
 
2790
    parser.add_argument("--no-dbus", action="store_false",
 
2791
                        dest="use_dbus", help="Do not provide D-Bus"
 
2792
                        " system bus interface", default=None)
 
2793
    parser.add_argument("--no-ipv6", action="store_false",
 
2794
                        dest="use_ipv6", help="Do not use IPv6",
 
2795
                        default=None)
 
2796
    parser.add_argument("--no-restore", action="store_false",
 
2797
                        dest="restore", help="Do not restore stored"
 
2798
                        " state", default=None)
 
2799
    parser.add_argument("--socket", type=int,
 
2800
                        help="Specify a file descriptor to a network"
 
2801
                        " socket to use instead of creating one")
 
2802
    parser.add_argument("--statedir", metavar="DIR",
 
2803
                        help="Directory to save/restore state in")
 
2804
    parser.add_argument("--foreground", action="store_true",
 
2805
                        help="Run in foreground", default=None)
 
2806
    parser.add_argument("--no-zeroconf", action="store_false",
 
2807
                        dest="zeroconf", help="Do not use Zeroconf",
 
2808
                        default=None)
 
2809
    
 
2810
    options = parser.parse_args()
710
2811
    
711
2812
    if options.check:
712
2813
        import doctest
713
 
        doctest.testmod()
714
 
        sys.exit()
 
2814
        fail_count, test_count = doctest.testmod()
 
2815
        sys.exit(os.EX_OK if fail_count == 0 else 1)
715
2816
    
716
2817
    # Default values for config file for server-global settings
717
2818
    server_defaults = { "interface": "",
719
2820
                        "port": "",
720
2821
                        "debug": "False",
721
2822
                        "priority":
722
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
2823
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"
 
2824
                        ":+SIGN-DSA-SHA256",
723
2825
                        "servicename": "Mandos",
724
 
                        }
 
2826
                        "use_dbus": "True",
 
2827
                        "use_ipv6": "True",
 
2828
                        "debuglevel": "",
 
2829
                        "restore": "True",
 
2830
                        "socket": "",
 
2831
                        "statedir": "/var/lib/mandos",
 
2832
                        "foreground": "False",
 
2833
                        "zeroconf": "True",
 
2834
                    }
725
2835
    
726
2836
    # Parse config file for server-global settings
727
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
2837
    server_config = configparser.SafeConfigParser(server_defaults)
728
2838
    del server_defaults
729
2839
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
730
2840
    # Convert the SafeConfigParser object to a dict
731
2841
    server_settings = server_config.defaults()
732
 
    # Use getboolean on the boolean config option
733
 
    server_settings["debug"] = server_config.getboolean\
734
 
                               ("DEFAULT", "debug")
 
2842
    # Use the appropriate methods on the non-string config options
 
2843
    for option in ("debug", "use_dbus", "use_ipv6", "foreground"):
 
2844
        server_settings[option] = server_config.getboolean("DEFAULT",
 
2845
                                                           option)
 
2846
    if server_settings["port"]:
 
2847
        server_settings["port"] = server_config.getint("DEFAULT",
 
2848
                                                       "port")
 
2849
    if server_settings["socket"]:
 
2850
        server_settings["socket"] = server_config.getint("DEFAULT",
 
2851
                                                         "socket")
 
2852
        # Later, stdin will, and stdout and stderr might, be dup'ed
 
2853
        # over with an opened os.devnull.  But we don't want this to
 
2854
        # happen with a supplied network socket.
 
2855
        if 0 <= server_settings["socket"] <= 2:
 
2856
            server_settings["socket"] = os.dup(server_settings
 
2857
                                               ["socket"])
735
2858
    del server_config
736
2859
    
737
2860
    # Override the settings from the config file with command line
738
2861
    # options, if set.
739
2862
    for option in ("interface", "address", "port", "debug",
740
 
                   "priority", "servicename", "configdir"):
 
2863
                   "priority", "servicename", "configdir", "use_dbus",
 
2864
                   "use_ipv6", "debuglevel", "restore", "statedir",
 
2865
                   "socket", "foreground", "zeroconf"):
741
2866
        value = getattr(options, option)
742
2867
        if value is not None:
743
2868
            server_settings[option] = value
744
2869
    del options
 
2870
    # Force all strings to be unicode
 
2871
    for option in server_settings.keys():
 
2872
        if isinstance(server_settings[option], bytes):
 
2873
            server_settings[option] = (server_settings[option]
 
2874
                                       .decode("utf-8"))
 
2875
    # Force all boolean options to be boolean
 
2876
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
 
2877
                   "foreground", "zeroconf"):
 
2878
        server_settings[option] = bool(server_settings[option])
 
2879
    # Debug implies foreground
 
2880
    if server_settings["debug"]:
 
2881
        server_settings["foreground"] = True
745
2882
    # Now we have our good server settings in "server_settings"
746
2883
    
 
2884
    ##################################################################
 
2885
    
 
2886
    if (not server_settings["zeroconf"]
 
2887
        and not (server_settings["port"]
 
2888
                 or server_settings["socket"] != "")):
 
2889
        parser.error("Needs port or socket to work without Zeroconf")
 
2890
    
 
2891
    # For convenience
747
2892
    debug = server_settings["debug"]
 
2893
    debuglevel = server_settings["debuglevel"]
 
2894
    use_dbus = server_settings["use_dbus"]
 
2895
    use_ipv6 = server_settings["use_ipv6"]
 
2896
    stored_state_path = os.path.join(server_settings["statedir"],
 
2897
                                     stored_state_file)
 
2898
    foreground = server_settings["foreground"]
 
2899
    zeroconf = server_settings["zeroconf"]
748
2900
    
749
 
    if not debug:
750
 
        syslogger.setLevel(logging.WARNING)
751
 
        console.setLevel(logging.WARNING)
 
2901
    if debug:
 
2902
        initlogger(debug, logging.DEBUG)
 
2903
    else:
 
2904
        if not debuglevel:
 
2905
            initlogger(debug)
 
2906
        else:
 
2907
            level = getattr(logging, debuglevel.upper())
 
2908
            initlogger(debug, level)
752
2909
    
753
2910
    if server_settings["servicename"] != "Mandos":
754
 
        syslogger.setFormatter(logging.Formatter\
755
 
                               ('Mandos (%s): %%(levelname)s:'
756
 
                                ' %%(message)s'
757
 
                                % server_settings["servicename"]))
 
2911
        syslogger.setFormatter(
 
2912
            logging.Formatter('Mandos ({}) [%(process)d]:'
 
2913
                              ' %(levelname)s: %(message)s'.format(
 
2914
                                  server_settings["servicename"])))
758
2915
    
759
2916
    # Parse config file with clients
760
 
    client_defaults = { "timeout": "1h",
761
 
                        "interval": "5m",
762
 
                        "checker": "fping -q -- %(host)s",
763
 
                        "host": "",
764
 
                        }
765
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
 
2917
    client_config = configparser.SafeConfigParser(Client
 
2918
                                                  .client_defaults)
766
2919
    client_config.read(os.path.join(server_settings["configdir"],
767
2920
                                    "clients.conf"))
768
2921
    
769
 
    clients = Set()
770
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
771
 
                                 server_settings["port"]),
772
 
                                tcp_handler,
773
 
                                settings=server_settings,
774
 
                                clients=clients)
775
 
    pidfilename = "/var/run/mandos.pid"
776
 
    try:
777
 
        pidfile = open(pidfilename, "w")
778
 
    except IOError, error:
779
 
        logger.error("Could not open file %r", pidfilename)
780
 
    
781
 
    uid = 65534
782
 
    gid = 65534
783
 
    try:
784
 
        uid = pwd.getpwnam("mandos").pw_uid
785
 
    except KeyError:
786
 
        try:
787
 
            uid = pwd.getpwnam("nobody").pw_uid
788
 
        except KeyError:
789
 
            pass
790
 
    try:
791
 
        gid = pwd.getpwnam("mandos").pw_gid
792
 
    except KeyError:
793
 
        try:
794
 
            gid = pwd.getpwnam("nogroup").pw_gid
795
 
        except KeyError:
796
 
            pass
797
 
    try:
 
2922
    global mandos_dbus_service
 
2923
    mandos_dbus_service = None
 
2924
    
 
2925
    socketfd = None
 
2926
    if server_settings["socket"] != "":
 
2927
        socketfd = server_settings["socket"]
 
2928
    tcp_server = MandosServer(
 
2929
        (server_settings["address"], server_settings["port"]),
 
2930
        ClientHandler,
 
2931
        interface=(server_settings["interface"] or None),
 
2932
        use_ipv6=use_ipv6,
 
2933
        gnutls_priority=server_settings["priority"],
 
2934
        use_dbus=use_dbus,
 
2935
        socketfd=socketfd)
 
2936
    if not foreground:
 
2937
        pidfilename = "/run/mandos.pid"
 
2938
        if not os.path.isdir("/run/."):
 
2939
            pidfilename = "/var/run/mandos.pid"
 
2940
        pidfile = None
 
2941
        try:
 
2942
            pidfile = codecs.open(pidfilename, "w", encoding="utf-8")
 
2943
        except IOError as e:
 
2944
            logger.error("Could not open file %r", pidfilename,
 
2945
                         exc_info=e)
 
2946
    
 
2947
    for name, group in (("_mandos", "_mandos"),
 
2948
                        ("mandos", "mandos"),
 
2949
                        ("nobody", "nogroup")):
 
2950
        try:
 
2951
            uid = pwd.getpwnam(name).pw_uid
 
2952
            gid = pwd.getpwnam(group).pw_gid
 
2953
            break
 
2954
        except KeyError:
 
2955
            continue
 
2956
    else:
 
2957
        uid = 65534
 
2958
        gid = 65534
 
2959
    try:
 
2960
        os.setgid(gid)
798
2961
        os.setuid(uid)
799
 
        os.setgid(gid)
800
 
    except OSError, error:
801
 
        if error[0] != errno.EPERM:
802
 
            raise error
803
 
    
804
 
    global service
805
 
    service = AvahiService(name = server_settings["servicename"],
806
 
                           type = "_mandos._tcp", );
807
 
    if server_settings["interface"]:
808
 
        service.interface = if_nametoindex\
809
 
                            (server_settings["interface"])
 
2962
        if debug:
 
2963
            logger.debug("Did setuid/setgid to {}:{}".format(uid,
 
2964
                                                             gid))
 
2965
    except OSError as error:
 
2966
        logger.warning("Failed to setuid/setgid to {}:{}: {}"
 
2967
                       .format(uid, gid, os.strerror(error.errno)))
 
2968
        if error.errno != errno.EPERM:
 
2969
            raise
 
2970
    
 
2971
    if debug:
 
2972
        # Enable all possible GnuTLS debugging
 
2973
        
 
2974
        # "Use a log level over 10 to enable all debugging options."
 
2975
        # - GnuTLS manual
 
2976
        gnutls.global_set_log_level(11)
 
2977
        
 
2978
        @gnutls.log_func
 
2979
        def debug_gnutls(level, string):
 
2980
            logger.debug("GnuTLS: %s", string[:-1])
 
2981
        
 
2982
        gnutls.global_set_log_function(debug_gnutls)
 
2983
        
 
2984
        # Redirect stdin so all checkers get /dev/null
 
2985
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
 
2986
        os.dup2(null, sys.stdin.fileno())
 
2987
        if null > 2:
 
2988
            os.close(null)
 
2989
    
 
2990
    # Need to fork before connecting to D-Bus
 
2991
    if not foreground:
 
2992
        # Close all input and output, do double fork, etc.
 
2993
        daemon()
 
2994
    
 
2995
    # multiprocessing will use threads, so before we use GLib we need
 
2996
    # to inform GLib that threads will be used.
 
2997
    GLib.threads_init()
810
2998
    
811
2999
    global main_loop
812
 
    global bus
813
 
    global server
814
3000
    # From the Avahi example code
815
 
    DBusGMainLoop(set_as_default=True )
816
 
    main_loop = gobject.MainLoop()
 
3001
    DBusGMainLoop(set_as_default=True)
 
3002
    main_loop = GLib.MainLoop()
817
3003
    bus = dbus.SystemBus()
818
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
819
 
                                           avahi.DBUS_PATH_SERVER),
820
 
                            avahi.DBUS_INTERFACE_SERVER)
821
3004
    # End of Avahi example code
822
 
    
823
 
    def remove_from_clients(client):
824
 
        clients.remove(client)
825
 
        if not clients:
826
 
            logger.critical(u"No clients left, exiting")
827
 
            sys.exit()
828
 
    
829
 
    clients.update(Set(Client(name = section,
830
 
                              stop_hook = remove_from_clients,
831
 
                              config
832
 
                              = dict(client_config.items(section)))
833
 
                       for section in client_config.sections()))
834
 
    if not clients:
835
 
        logger.critical(u"No clients defined")
836
 
        sys.exit(1)
837
 
    
838
 
    if debug:
839
 
        # Redirect stdin so all checkers get /dev/null
840
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
841
 
        os.dup2(null, sys.stdin.fileno())
842
 
        if null > 2:
843
 
            os.close(null)
844
 
    else:
845
 
        # No console logging
846
 
        logger.removeHandler(console)
847
 
        # Close all input and output, do double fork, etc.
848
 
        daemon()
849
 
    
850
 
    try:
851
 
        pid = os.getpid()
852
 
        pidfile.write(str(pid) + "\n")
853
 
        pidfile.close()
 
3005
    if use_dbus:
 
3006
        try:
 
3007
            bus_name = dbus.service.BusName("se.recompile.Mandos",
 
3008
                                            bus,
 
3009
                                            do_not_queue=True)
 
3010
            old_bus_name = dbus.service.BusName(
 
3011
                "se.bsnet.fukt.Mandos", bus,
 
3012
                do_not_queue=True)
 
3013
        except dbus.exceptions.DBusException as e:
 
3014
            logger.error("Disabling D-Bus:", exc_info=e)
 
3015
            use_dbus = False
 
3016
            server_settings["use_dbus"] = False
 
3017
            tcp_server.use_dbus = False
 
3018
    if zeroconf:
 
3019
        protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
3020
        service = AvahiServiceToSyslog(
 
3021
            name = server_settings["servicename"],
 
3022
            servicetype = "_mandos._tcp",
 
3023
            protocol = protocol,
 
3024
            bus = bus)
 
3025
        if server_settings["interface"]:
 
3026
            service.interface = if_nametoindex(
 
3027
                server_settings["interface"].encode("utf-8"))
 
3028
    
 
3029
    global multiprocessing_manager
 
3030
    multiprocessing_manager = multiprocessing.Manager()
 
3031
    
 
3032
    client_class = Client
 
3033
    if use_dbus:
 
3034
        client_class = functools.partial(ClientDBus, bus = bus)
 
3035
    
 
3036
    client_settings = Client.config_parser(client_config)
 
3037
    old_client_settings = {}
 
3038
    clients_data = {}
 
3039
    
 
3040
    # This is used to redirect stdout and stderr for checker processes
 
3041
    global wnull
 
3042
    wnull = open(os.devnull, "w") # A writable /dev/null
 
3043
    # Only used if server is running in foreground but not in debug
 
3044
    # mode
 
3045
    if debug or not foreground:
 
3046
        wnull.close()
 
3047
    
 
3048
    # Get client data and settings from last running state.
 
3049
    if server_settings["restore"]:
 
3050
        try:
 
3051
            with open(stored_state_path, "rb") as stored_state:
 
3052
                if sys.version_info.major == 2:                
 
3053
                    clients_data, old_client_settings = pickle.load(
 
3054
                        stored_state)
 
3055
                else:
 
3056
                    bytes_clients_data, bytes_old_client_settings = (
 
3057
                        pickle.load(stored_state, encoding = "bytes"))
 
3058
                    ### Fix bytes to strings
 
3059
                    ## clients_data
 
3060
                    # .keys()
 
3061
                    clients_data = { (key.decode("utf-8")
 
3062
                                      if isinstance(key, bytes)
 
3063
                                      else key): value
 
3064
                                     for key, value in
 
3065
                                     bytes_clients_data.items() }
 
3066
                    del bytes_clients_data
 
3067
                    for key in clients_data:
 
3068
                        value = { (k.decode("utf-8")
 
3069
                                   if isinstance(k, bytes) else k): v
 
3070
                                  for k, v in
 
3071
                                  clients_data[key].items() }
 
3072
                        clients_data[key] = value
 
3073
                        # .client_structure
 
3074
                        value["client_structure"] = [
 
3075
                            (s.decode("utf-8")
 
3076
                             if isinstance(s, bytes)
 
3077
                             else s) for s in
 
3078
                            value["client_structure"] ]
 
3079
                        # .name & .host
 
3080
                        for k in ("name", "host"):
 
3081
                            if isinstance(value[k], bytes):
 
3082
                                value[k] = value[k].decode("utf-8")
 
3083
                    ## old_client_settings
 
3084
                    # .keys()
 
3085
                    old_client_settings = {
 
3086
                        (key.decode("utf-8")
 
3087
                         if isinstance(key, bytes)
 
3088
                         else key): value
 
3089
                        for key, value in
 
3090
                        bytes_old_client_settings.items() }
 
3091
                    del bytes_old_client_settings
 
3092
                    # .host
 
3093
                    for value in old_client_settings.values():
 
3094
                        if isinstance(value["host"], bytes):
 
3095
                            value["host"] = (value["host"]
 
3096
                                             .decode("utf-8"))
 
3097
            os.remove(stored_state_path)
 
3098
        except IOError as e:
 
3099
            if e.errno == errno.ENOENT:
 
3100
                logger.warning("Could not load persistent state:"
 
3101
                               " {}".format(os.strerror(e.errno)))
 
3102
            else:
 
3103
                logger.critical("Could not load persistent state:",
 
3104
                                exc_info=e)
 
3105
                raise
 
3106
        except EOFError as e:
 
3107
            logger.warning("Could not load persistent state: "
 
3108
                           "EOFError:",
 
3109
                           exc_info=e)
 
3110
    
 
3111
    with PGPEngine() as pgp:
 
3112
        for client_name, client in clients_data.items():
 
3113
            # Skip removed clients
 
3114
            if client_name not in client_settings:
 
3115
                continue
 
3116
            
 
3117
            # Decide which value to use after restoring saved state.
 
3118
            # We have three different values: Old config file,
 
3119
            # new config file, and saved state.
 
3120
            # New config value takes precedence if it differs from old
 
3121
            # config value, otherwise use saved state.
 
3122
            for name, value in client_settings[client_name].items():
 
3123
                try:
 
3124
                    # For each value in new config, check if it
 
3125
                    # differs from the old config value (Except for
 
3126
                    # the "secret" attribute)
 
3127
                    if (name != "secret"
 
3128
                        and (value !=
 
3129
                             old_client_settings[client_name][name])):
 
3130
                        client[name] = value
 
3131
                except KeyError:
 
3132
                    pass
 
3133
            
 
3134
            # Clients who has passed its expire date can still be
 
3135
            # enabled if its last checker was successful.  A Client
 
3136
            # whose checker succeeded before we stored its state is
 
3137
            # assumed to have successfully run all checkers during
 
3138
            # downtime.
 
3139
            if client["enabled"]:
 
3140
                if datetime.datetime.utcnow() >= client["expires"]:
 
3141
                    if not client["last_checked_ok"]:
 
3142
                        logger.warning(
 
3143
                            "disabling client {} - Client never "
 
3144
                            "performed a successful checker".format(
 
3145
                                client_name))
 
3146
                        client["enabled"] = False
 
3147
                    elif client["last_checker_status"] != 0:
 
3148
                        logger.warning(
 
3149
                            "disabling client {} - Client last"
 
3150
                            " checker failed with error code"
 
3151
                            " {}".format(
 
3152
                                client_name,
 
3153
                                client["last_checker_status"]))
 
3154
                        client["enabled"] = False
 
3155
                    else:
 
3156
                        client["expires"] = (
 
3157
                            datetime.datetime.utcnow()
 
3158
                            + client["timeout"])
 
3159
                        logger.debug("Last checker succeeded,"
 
3160
                                     " keeping {} enabled".format(
 
3161
                                         client_name))
 
3162
            try:
 
3163
                client["secret"] = pgp.decrypt(
 
3164
                    client["encrypted_secret"],
 
3165
                    client_settings[client_name]["secret"])
 
3166
            except PGPError:
 
3167
                # If decryption fails, we use secret from new settings
 
3168
                logger.debug("Failed to decrypt {} old secret".format(
 
3169
                    client_name))
 
3170
                client["secret"] = (client_settings[client_name]
 
3171
                                    ["secret"])
 
3172
    
 
3173
    # Add/remove clients based on new changes made to config
 
3174
    for client_name in (set(old_client_settings)
 
3175
                        - set(client_settings)):
 
3176
        del clients_data[client_name]
 
3177
    for client_name in (set(client_settings)
 
3178
                        - set(old_client_settings)):
 
3179
        clients_data[client_name] = client_settings[client_name]
 
3180
    
 
3181
    # Create all client objects
 
3182
    for client_name, client in clients_data.items():
 
3183
        tcp_server.clients[client_name] = client_class(
 
3184
            name = client_name,
 
3185
            settings = client,
 
3186
            server_settings = server_settings)
 
3187
    
 
3188
    if not tcp_server.clients:
 
3189
        logger.warning("No clients defined")
 
3190
    
 
3191
    if not foreground:
 
3192
        if pidfile is not None:
 
3193
            pid = os.getpid()
 
3194
            try:
 
3195
                with pidfile:
 
3196
                    print(pid, file=pidfile)
 
3197
            except IOError:
 
3198
                logger.error("Could not write to file %r with PID %d",
 
3199
                             pidfilename, pid)
854
3200
        del pidfile
855
 
    except IOError, err:
856
 
        logger.error(u"Could not write to file %r with PID %d",
857
 
                     pidfilename, pid)
858
 
    except NameError:
859
 
        # "pidfile" was never created
860
 
        pass
861
 
    del pidfilename
 
3201
        del pidfilename
 
3202
    
 
3203
    for termsig in (signal.SIGHUP, signal.SIGTERM):
 
3204
        GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,
 
3205
                             lambda: main_loop.quit() and False)
 
3206
    
 
3207
    if use_dbus:
 
3208
        
 
3209
        @alternate_dbus_interfaces(
 
3210
            { "se.recompile.Mandos": "se.bsnet.fukt.Mandos" })
 
3211
        class MandosDBusService(DBusObjectWithObjectManager):
 
3212
            """A D-Bus proxy object"""
 
3213
            
 
3214
            def __init__(self):
 
3215
                dbus.service.Object.__init__(self, bus, "/")
 
3216
            
 
3217
            _interface = "se.recompile.Mandos"
 
3218
            
 
3219
            @dbus.service.signal(_interface, signature="o")
 
3220
            def ClientAdded(self, objpath):
 
3221
                "D-Bus signal"
 
3222
                pass
 
3223
            
 
3224
            @dbus.service.signal(_interface, signature="ss")
 
3225
            def ClientNotFound(self, fingerprint, address):
 
3226
                "D-Bus signal"
 
3227
                pass
 
3228
            
 
3229
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
 
3230
                               "true"})
 
3231
            @dbus.service.signal(_interface, signature="os")
 
3232
            def ClientRemoved(self, objpath, name):
 
3233
                "D-Bus signal"
 
3234
                pass
 
3235
            
 
3236
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
 
3237
                               "true"})
 
3238
            @dbus.service.method(_interface, out_signature="ao")
 
3239
            def GetAllClients(self):
 
3240
                "D-Bus method"
 
3241
                return dbus.Array(c.dbus_object_path for c in
 
3242
                                  tcp_server.clients.values())
 
3243
            
 
3244
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
 
3245
                               "true"})
 
3246
            @dbus.service.method(_interface,
 
3247
                                 out_signature="a{oa{sv}}")
 
3248
            def GetAllClientsWithProperties(self):
 
3249
                "D-Bus method"
 
3250
                return dbus.Dictionary(
 
3251
                    { c.dbus_object_path: c.GetAll(
 
3252
                        "se.recompile.Mandos.Client")
 
3253
                      for c in tcp_server.clients.values() },
 
3254
                    signature="oa{sv}")
 
3255
            
 
3256
            @dbus.service.method(_interface, in_signature="o")
 
3257
            def RemoveClient(self, object_path):
 
3258
                "D-Bus method"
 
3259
                for c in tcp_server.clients.values():
 
3260
                    if c.dbus_object_path == object_path:
 
3261
                        del tcp_server.clients[c.name]
 
3262
                        c.remove_from_connection()
 
3263
                        # Don't signal the disabling
 
3264
                        c.disable(quiet=True)
 
3265
                        # Emit D-Bus signal for removal
 
3266
                        self.client_removed_signal(c)
 
3267
                        return
 
3268
                raise KeyError(object_path)
 
3269
            
 
3270
            del _interface
 
3271
            
 
3272
            @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
 
3273
                                 out_signature = "a{oa{sa{sv}}}")
 
3274
            def GetManagedObjects(self):
 
3275
                """D-Bus method"""
 
3276
                return dbus.Dictionary(
 
3277
                    { client.dbus_object_path:
 
3278
                      dbus.Dictionary(
 
3279
                          { interface: client.GetAll(interface)
 
3280
                            for interface in
 
3281
                                 client._get_all_interface_names()})
 
3282
                      for client in tcp_server.clients.values()})
 
3283
            
 
3284
            def client_added_signal(self, client):
 
3285
                """Send the new standard signal and the old signal"""
 
3286
                if use_dbus:
 
3287
                    # New standard signal
 
3288
                    self.InterfacesAdded(
 
3289
                        client.dbus_object_path,
 
3290
                        dbus.Dictionary(
 
3291
                            { interface: client.GetAll(interface)
 
3292
                              for interface in
 
3293
                              client._get_all_interface_names()}))
 
3294
                    # Old signal
 
3295
                    self.ClientAdded(client.dbus_object_path)
 
3296
            
 
3297
            def client_removed_signal(self, client):
 
3298
                """Send the new standard signal and the old signal"""
 
3299
                if use_dbus:
 
3300
                    # New standard signal
 
3301
                    self.InterfacesRemoved(
 
3302
                        client.dbus_object_path,
 
3303
                        client._get_all_interface_names())
 
3304
                    # Old signal
 
3305
                    self.ClientRemoved(client.dbus_object_path,
 
3306
                                       client.name)
 
3307
        
 
3308
        mandos_dbus_service = MandosDBusService()
862
3309
    
863
3310
    def cleanup():
864
3311
        "Cleanup function; run on exit"
865
 
        global group
866
 
        # From the Avahi example code
867
 
        if not group is None:
868
 
            group.Free()
869
 
            group = None
870
 
        # End of Avahi example code
871
 
        
872
 
        while clients:
873
 
            client = clients.pop()
874
 
            client.stop_hook = None
875
 
            client.stop()
 
3312
        if zeroconf:
 
3313
            service.cleanup()
 
3314
        
 
3315
        multiprocessing.active_children()
 
3316
        wnull.close()
 
3317
        if not (tcp_server.clients or client_settings):
 
3318
            return
 
3319
        
 
3320
        # Store client before exiting. Secrets are encrypted with key
 
3321
        # based on what config file has. If config file is
 
3322
        # removed/edited, old secret will thus be unrecovable.
 
3323
        clients = {}
 
3324
        with PGPEngine() as pgp:
 
3325
            for client in tcp_server.clients.values():
 
3326
                key = client_settings[client.name]["secret"]
 
3327
                client.encrypted_secret = pgp.encrypt(client.secret,
 
3328
                                                      key)
 
3329
                client_dict = {}
 
3330
                
 
3331
                # A list of attributes that can not be pickled
 
3332
                # + secret.
 
3333
                exclude = { "bus", "changedstate", "secret",
 
3334
                            "checker", "server_settings" }
 
3335
                for name, typ in inspect.getmembers(dbus.service
 
3336
                                                    .Object):
 
3337
                    exclude.add(name)
 
3338
                
 
3339
                client_dict["encrypted_secret"] = (client
 
3340
                                                   .encrypted_secret)
 
3341
                for attr in client.client_structure:
 
3342
                    if attr not in exclude:
 
3343
                        client_dict[attr] = getattr(client, attr)
 
3344
                
 
3345
                clients[client.name] = client_dict
 
3346
                del client_settings[client.name]["secret"]
 
3347
        
 
3348
        try:
 
3349
            with tempfile.NamedTemporaryFile(
 
3350
                    mode='wb',
 
3351
                    suffix=".pickle",
 
3352
                    prefix='clients-',
 
3353
                    dir=os.path.dirname(stored_state_path),
 
3354
                    delete=False) as stored_state:
 
3355
                pickle.dump((clients, client_settings), stored_state,
 
3356
                            protocol = 2)
 
3357
                tempname = stored_state.name
 
3358
            os.rename(tempname, stored_state_path)
 
3359
        except (IOError, OSError) as e:
 
3360
            if not debug:
 
3361
                try:
 
3362
                    os.remove(tempname)
 
3363
                except NameError:
 
3364
                    pass
 
3365
            if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
 
3366
                logger.warning("Could not save persistent state: {}"
 
3367
                               .format(os.strerror(e.errno)))
 
3368
            else:
 
3369
                logger.warning("Could not save persistent state:",
 
3370
                               exc_info=e)
 
3371
                raise
 
3372
        
 
3373
        # Delete all clients, and settings from config
 
3374
        while tcp_server.clients:
 
3375
            name, client = tcp_server.clients.popitem()
 
3376
            if use_dbus:
 
3377
                client.remove_from_connection()
 
3378
            # Don't signal the disabling
 
3379
            client.disable(quiet=True)
 
3380
            # Emit D-Bus signal for removal
 
3381
            if use_dbus:
 
3382
                mandos_dbus_service.client_removed_signal(client)
 
3383
        client_settings.clear()
876
3384
    
877
3385
    atexit.register(cleanup)
878
3386
    
879
 
    if not debug:
880
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
881
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
882
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
883
 
    
884
 
    for client in clients:
885
 
        client.start()
 
3387
    for client in tcp_server.clients.values():
 
3388
        if use_dbus:
 
3389
            # Emit D-Bus signal for adding
 
3390
            mandos_dbus_service.client_added_signal(client)
 
3391
        # Need to initiate checking of clients
 
3392
        if client.enabled:
 
3393
            client.init_checker()
886
3394
    
887
3395
    tcp_server.enable()
888
3396
    tcp_server.server_activate()
889
3397
    
890
3398
    # Find out what port we got
891
 
    service.port = tcp_server.socket.getsockname()[1]
892
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
893
 
                u" scope_id %d" % tcp_server.socket.getsockname())
 
3399
    if zeroconf:
 
3400
        service.port = tcp_server.socket.getsockname()[1]
 
3401
    if use_ipv6:
 
3402
        logger.info("Now listening on address %r, port %d,"
 
3403
                    " flowinfo %d, scope_id %d",
 
3404
                    *tcp_server.socket.getsockname())
 
3405
    else:                       # IPv4
 
3406
        logger.info("Now listening on address %r, port %d",
 
3407
                    *tcp_server.socket.getsockname())
894
3408
    
895
3409
    #service.interface = tcp_server.socket.getsockname()[3]
896
3410
    
897
3411
    try:
898
 
        # From the Avahi example code
899
 
        server.connect_to_signal("StateChanged", server_state_changed)
900
 
        try:
901
 
            server_state_changed(server.GetState())
902
 
        except dbus.exceptions.DBusException, error:
903
 
            logger.critical(u"DBusException: %s", error)
904
 
            sys.exit(1)
905
 
        # End of Avahi example code
906
 
        
907
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
908
 
                             lambda *args, **kwargs:
909
 
                             tcp_server.handle_request\
910
 
                             (*args[2:], **kwargs) or True)
911
 
        
912
 
        logger.debug(u"Starting main loop")
913
 
        main_loop_started = True
 
3412
        if zeroconf:
 
3413
            # From the Avahi example code
 
3414
            try:
 
3415
                service.activate()
 
3416
            except dbus.exceptions.DBusException as error:
 
3417
                logger.critical("D-Bus Exception", exc_info=error)
 
3418
                cleanup()
 
3419
                sys.exit(1)
 
3420
            # End of Avahi example code
 
3421
        
 
3422
        GLib.io_add_watch(tcp_server.fileno(), GLib.IO_IN,
 
3423
                          lambda *args, **kwargs:
 
3424
                          (tcp_server.handle_request
 
3425
                           (*args[2:], **kwargs) or True))
 
3426
        
 
3427
        logger.debug("Starting main loop")
914
3428
        main_loop.run()
915
 
    except AvahiError, error:
916
 
        logger.critical(u"AvahiError: %s" + unicode(error))
 
3429
    except AvahiError as error:
 
3430
        logger.critical("Avahi Error", exc_info=error)
 
3431
        cleanup()
917
3432
        sys.exit(1)
918
3433
    except KeyboardInterrupt:
919
3434
        if debug:
920
 
            print
 
3435
            print("", file=sys.stderr)
 
3436
        logger.debug("Server received KeyboardInterrupt")
 
3437
    logger.debug("Server exiting")
 
3438
    # Must run before the D-Bus bus name gets deregistered
 
3439
    cleanup()
 
3440
 
921
3441
 
922
3442
if __name__ == '__main__':
923
3443
    main()