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  • Committer: Teddy Hogeborn
  • Date: 2008-07-19 18:43:24 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080719184324-iwhoa5in75xa0u2u
* mandos-clients.conf ([foo]/dn, [foo]/password, [braxen_client]/dn,
                       [braxen_client]/password): Removed.
  ([foo]/fingerprint, [braxen_client]/fingerprint): New.
  ([foo]/checker): New.
  ([foo]/secfile): New.
  ([braxen_client]/secret): New.

* server.py: New "--debug" option to set debug flag.  Removed "cert",
             "key", "ca", "crl", and "cred" variables.  Added default
             value for "checker" config file setting.  Do not pass
             credentials to IPv6_TCPServer constructor.
  (debug): New global debug flag.  Used by most debugging output code.
  (Client.__init__): Keyword argument "dn" replaced by "fingerprint",
                     "password" renamed to "secret", and "passfile"
                     renamed to "secfile".  New keyword argument
                     "checker". All callers changed.
  (Client.dn): Removed.
  (Client.fingerprint): New.
  (Client.password): Renamed to "secret"; all users changed.
  (Client.passfile): Renamed to "secfile"; all users changed.
  (Client.timeout, Client.interval): Changed to be properties; now
                                     automatically updates the
                                     "_timeout_milliseconds" and
                                     "_interval_milliseconds" values.
  (Client.timeout_milliseconds): Renamed to "_timeout_milliseconds".
  (Client.interval_milliseconds): Renamed to "_interval_milliseconds".
  (Client.check_command): New.
  (Client.start_checker): Use the new "check_command" attribute.
  (peer_certificate, fingerprint): New functions.

  (tcp_handler.handle): Use ClientSession with empty credentials
                        object instead of ServerSession.  Set gnutls
                        priority string.  Do not verify peer.  Use
                        fingerprint instead of DN when searching for
                        clients.  Bug fix: Loop sending data so even large
                        secret data strings are sent.
  (IPv6_TCPServer.credentials): Removed.
  (if_nametoindex): Do not import ctypes since that is now imported
                    globally.

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1
#!/usr/bin/python
2
 
# -*- mode: python; coding: utf-8 -*-
3
 
#
4
 
# Mandos server - give out binary blobs to connecting clients.
5
 
#
6
 
# This program is partly derived from an example program for an Avahi
7
 
# service publisher, downloaded from
8
 
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add", "remove", "server_state_changed",
10
 
# "entry_group_state_changed", "cleanup", and "activate" in the
11
 
# "AvahiService" class, and some lines in "main".
12
 
#
13
 
# Everything else is
14
 
# Copyright © 2008-2019 Teddy Hogeborn
15
 
# Copyright © 2008-2019 Björn Påhlsson
16
 
#
17
 
# This file is part of Mandos.
18
 
#
19
 
# Mandos is free software: you can redistribute it and/or modify it
20
 
# under the terms of the GNU General Public License as published by
21
 
# the Free Software Foundation, either version 3 of the License, or
22
 
# (at your option) any later version.
23
 
#
24
 
#     Mandos is distributed in the hope that it will be useful, but
25
 
#     WITHOUT ANY WARRANTY; without even the implied warranty of
26
 
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
27
 
#     GNU General Public License for more details.
28
 
#
29
 
# You should have received a copy of the GNU General Public License
30
 
# along with Mandos.  If not, see <http://www.gnu.org/licenses/>.
31
 
#
32
 
# Contact the authors at <mandos@recompile.se>.
33
 
#
34
 
 
35
 
from __future__ import (division, absolute_import, print_function,
36
 
                        unicode_literals)
37
 
 
38
 
try:
39
 
    from future_builtins import *
40
 
except ImportError:
41
 
    pass
42
 
 
43
 
try:
44
 
    import SocketServer as socketserver
45
 
except ImportError:
46
 
    import socketserver
 
2
 
 
3
from __future__ import division
 
4
 
 
5
import SocketServer
47
6
import socket
48
 
import argparse
 
7
import select
 
8
from optparse import OptionParser
49
9
import datetime
50
10
import errno
51
 
try:
52
 
    import ConfigParser as configparser
53
 
except ImportError:
54
 
    import configparser
 
11
import gnutls.crypto
 
12
import gnutls.connection
 
13
import gnutls.errors
 
14
import gnutls.library.functions
 
15
import gnutls.library.constants
 
16
import gnutls.library.types
 
17
import ConfigParser
55
18
import sys
56
19
import re
57
20
import os
58
21
import signal
 
22
from sets import Set
59
23
import subprocess
60
 
import atexit
61
 
import stat
62
 
import logging
63
 
import logging.handlers
64
 
import pwd
65
 
import contextlib
66
 
import struct
67
 
import fcntl
68
 
import functools
69
 
try:
70
 
    import cPickle as pickle
71
 
except ImportError:
72
 
    import pickle
73
 
import multiprocessing
74
 
import types
75
 
import binascii
76
 
import tempfile
77
 
import itertools
78
 
import collections
79
 
import codecs
80
24
 
81
25
import dbus
82
 
import dbus.service
83
 
from gi.repository import GLib
 
26
import gobject
 
27
import avahi
84
28
from dbus.mainloop.glib import DBusGMainLoop
85
29
import ctypes
86
 
import ctypes.util
87
 
import xml.dom.minidom
88
 
import inspect
89
 
 
90
 
# Try to find the value of SO_BINDTODEVICE:
91
 
try:
92
 
    # This is where SO_BINDTODEVICE is in Python 3.3 (or 3.4?) and
93
 
    # newer, and it is also the most natural place for it:
94
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
95
 
except AttributeError:
96
 
    try:
97
 
        # This is where SO_BINDTODEVICE was up to and including Python
98
 
        # 2.6, and also 3.2:
99
 
        from IN import SO_BINDTODEVICE
100
 
    except ImportError:
101
 
        # In Python 2.7 it seems to have been removed entirely.
102
 
        # Try running the C preprocessor:
103
 
        try:
104
 
            cc = subprocess.Popen(["cc", "--language=c", "-E",
105
 
                                   "/dev/stdin"],
106
 
                                  stdin=subprocess.PIPE,
107
 
                                  stdout=subprocess.PIPE)
108
 
            stdout = cc.communicate(
109
 
                "#include <sys/socket.h>\nSO_BINDTODEVICE\n")[0]
110
 
            SO_BINDTODEVICE = int(stdout.splitlines()[-1])
111
 
        except (OSError, ValueError, IndexError):
112
 
            # No value found
113
 
            SO_BINDTODEVICE = None
114
 
 
115
 
if sys.version_info.major == 2:
116
 
    str = unicode
117
 
 
118
 
version = "1.8.4"
119
 
stored_state_file = "clients.pickle"
120
 
 
121
 
logger = logging.getLogger()
122
 
syslogger = None
123
 
 
124
 
try:
125
 
    if_nametoindex = ctypes.cdll.LoadLibrary(
126
 
        ctypes.util.find_library("c")).if_nametoindex
127
 
except (OSError, AttributeError):
128
 
 
129
 
    def if_nametoindex(interface):
130
 
        "Get an interface index the hard way, i.e. using fcntl()"
131
 
        SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
132
 
        with contextlib.closing(socket.socket()) as s:
133
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
134
 
                                struct.pack(b"16s16x", interface))
135
 
        interface_index = struct.unpack("I", ifreq[16:20])[0]
136
 
        return interface_index
137
 
 
138
 
 
139
 
def copy_function(func):
140
 
    """Make a copy of a function"""
141
 
    if sys.version_info.major == 2:
142
 
        return types.FunctionType(func.func_code,
143
 
                                  func.func_globals,
144
 
                                  func.func_name,
145
 
                                  func.func_defaults,
146
 
                                  func.func_closure)
147
 
    else:
148
 
        return types.FunctionType(func.__code__,
149
 
                                  func.__globals__,
150
 
                                  func.__name__,
151
 
                                  func.__defaults__,
152
 
                                  func.__closure__)
153
 
 
154
 
 
155
 
def initlogger(debug, level=logging.WARNING):
156
 
    """init logger and add loglevel"""
157
 
 
158
 
    global syslogger
159
 
    syslogger = (logging.handlers.SysLogHandler(
160
 
        facility=logging.handlers.SysLogHandler.LOG_DAEMON,
161
 
        address="/dev/log"))
162
 
    syslogger.setFormatter(logging.Formatter
163
 
                           ('Mandos [%(process)d]: %(levelname)s:'
164
 
                            ' %(message)s'))
165
 
    logger.addHandler(syslogger)
166
 
 
167
 
    if debug:
168
 
        console = logging.StreamHandler()
169
 
        console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
170
 
                                               ' [%(process)d]:'
171
 
                                               ' %(levelname)s:'
172
 
                                               ' %(message)s'))
173
 
        logger.addHandler(console)
174
 
    logger.setLevel(level)
175
 
 
176
 
 
177
 
class PGPError(Exception):
178
 
    """Exception if encryption/decryption fails"""
179
 
    pass
180
 
 
181
 
 
182
 
class PGPEngine(object):
183
 
    """A simple class for OpenPGP symmetric encryption & decryption"""
184
 
 
185
 
    def __init__(self):
186
 
        self.tempdir = tempfile.mkdtemp(prefix="mandos-")
187
 
        self.gpg = "gpg"
188
 
        try:
189
 
            output = subprocess.check_output(["gpgconf"])
190
 
            for line in output.splitlines():
191
 
                name, text, path = line.split(b":")
192
 
                if name == "gpg":
193
 
                    self.gpg = path
194
 
                    break
195
 
        except OSError as e:
196
 
            if e.errno != errno.ENOENT:
197
 
                raise
198
 
        self.gnupgargs = ['--batch',
199
 
                          '--homedir', self.tempdir,
200
 
                          '--force-mdc',
201
 
                          '--quiet']
202
 
        # Only GPG version 1 has the --no-use-agent option.
203
 
        if self.gpg == "gpg" or self.gpg.endswith("/gpg"):
204
 
            self.gnupgargs.append("--no-use-agent")
205
 
 
206
 
    def __enter__(self):
207
 
        return self
208
 
 
209
 
    def __exit__(self, exc_type, exc_value, traceback):
210
 
        self._cleanup()
211
 
        return False
212
 
 
213
 
    def __del__(self):
214
 
        self._cleanup()
215
 
 
216
 
    def _cleanup(self):
217
 
        if self.tempdir is not None:
218
 
            # Delete contents of tempdir
219
 
            for root, dirs, files in os.walk(self.tempdir,
220
 
                                             topdown=False):
221
 
                for filename in files:
222
 
                    os.remove(os.path.join(root, filename))
223
 
                for dirname in dirs:
224
 
                    os.rmdir(os.path.join(root, dirname))
225
 
            # Remove tempdir
226
 
            os.rmdir(self.tempdir)
227
 
            self.tempdir = None
228
 
 
229
 
    def password_encode(self, password):
230
 
        # Passphrase can not be empty and can not contain newlines or
231
 
        # NUL bytes.  So we prefix it and hex encode it.
232
 
        encoded = b"mandos" + binascii.hexlify(password)
233
 
        if len(encoded) > 2048:
234
 
            # GnuPG can't handle long passwords, so encode differently
235
 
            encoded = (b"mandos" + password.replace(b"\\", b"\\\\")
236
 
                       .replace(b"\n", b"\\n")
237
 
                       .replace(b"\0", b"\\x00"))
238
 
        return encoded
239
 
 
240
 
    def encrypt(self, data, password):
241
 
        passphrase = self.password_encode(password)
242
 
        with tempfile.NamedTemporaryFile(
243
 
                dir=self.tempdir) as passfile:
244
 
            passfile.write(passphrase)
245
 
            passfile.flush()
246
 
            proc = subprocess.Popen([self.gpg, '--symmetric',
247
 
                                     '--passphrase-file',
248
 
                                     passfile.name]
249
 
                                    + self.gnupgargs,
250
 
                                    stdin=subprocess.PIPE,
251
 
                                    stdout=subprocess.PIPE,
252
 
                                    stderr=subprocess.PIPE)
253
 
            ciphertext, err = proc.communicate(input=data)
254
 
        if proc.returncode != 0:
255
 
            raise PGPError(err)
256
 
        return ciphertext
257
 
 
258
 
    def decrypt(self, data, password):
259
 
        passphrase = self.password_encode(password)
260
 
        with tempfile.NamedTemporaryFile(
261
 
                dir=self.tempdir) as passfile:
262
 
            passfile.write(passphrase)
263
 
            passfile.flush()
264
 
            proc = subprocess.Popen([self.gpg, '--decrypt',
265
 
                                     '--passphrase-file',
266
 
                                     passfile.name]
267
 
                                    + self.gnupgargs,
268
 
                                    stdin=subprocess.PIPE,
269
 
                                    stdout=subprocess.PIPE,
270
 
                                    stderr=subprocess.PIPE)
271
 
            decrypted_plaintext, err = proc.communicate(input=data)
272
 
        if proc.returncode != 0:
273
 
            raise PGPError(err)
274
 
        return decrypted_plaintext
275
 
 
276
 
 
277
 
# Pretend that we have an Avahi module
278
 
class avahi(object):
279
 
    """This isn't so much a class as it is a module-like namespace."""
280
 
    IF_UNSPEC = -1               # avahi-common/address.h
281
 
    PROTO_UNSPEC = -1            # avahi-common/address.h
282
 
    PROTO_INET = 0               # avahi-common/address.h
283
 
    PROTO_INET6 = 1              # avahi-common/address.h
284
 
    DBUS_NAME = "org.freedesktop.Avahi"
285
 
    DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"
286
 
    DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"
287
 
    DBUS_PATH_SERVER = "/"
288
 
 
289
 
    @staticmethod
290
 
    def string_array_to_txt_array(t):
291
 
        return dbus.Array((dbus.ByteArray(s.encode("utf-8"))
292
 
                           for s in t), signature="ay")
293
 
    ENTRY_GROUP_ESTABLISHED = 2  # avahi-common/defs.h
294
 
    ENTRY_GROUP_COLLISION = 3    # avahi-common/defs.h
295
 
    ENTRY_GROUP_FAILURE = 4      # avahi-common/defs.h
296
 
    SERVER_INVALID = 0           # avahi-common/defs.h
297
 
    SERVER_REGISTERING = 1       # avahi-common/defs.h
298
 
    SERVER_RUNNING = 2           # avahi-common/defs.h
299
 
    SERVER_COLLISION = 3         # avahi-common/defs.h
300
 
    SERVER_FAILURE = 4           # avahi-common/defs.h
301
 
 
302
 
 
303
 
class AvahiError(Exception):
304
 
    def __init__(self, value, *args, **kwargs):
305
 
        self.value = value
306
 
        return super(AvahiError, self).__init__(value, *args,
307
 
                                                **kwargs)
308
 
 
309
 
 
310
 
class AvahiServiceError(AvahiError):
311
 
    pass
312
 
 
313
 
 
314
 
class AvahiGroupError(AvahiError):
315
 
    pass
316
 
 
317
 
 
318
 
class AvahiService(object):
319
 
    """An Avahi (Zeroconf) service.
320
 
 
321
 
    Attributes:
322
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
323
 
               Used to optionally bind to the specified interface.
324
 
    name: string; Example: 'Mandos'
325
 
    type: string; Example: '_mandos._tcp'.
326
 
     See <https://www.iana.org/assignments/service-names-port-numbers>
327
 
    port: integer; what port to announce
328
 
    TXT: list of strings; TXT record for the service
329
 
    domain: string; Domain to publish on, default to .local if empty.
330
 
    host: string; Host to publish records for, default is localhost
331
 
    max_renames: integer; maximum number of renames
332
 
    rename_count: integer; counter so we only rename after collisions
333
 
                  a sensible number of times
334
 
    group: D-Bus Entry Group
335
 
    server: D-Bus Server
336
 
    bus: dbus.SystemBus()
337
 
    """
338
 
 
339
 
    def __init__(self,
340
 
                 interface=avahi.IF_UNSPEC,
341
 
                 name=None,
342
 
                 servicetype=None,
343
 
                 port=None,
344
 
                 TXT=None,
345
 
                 domain="",
346
 
                 host="",
347
 
                 max_renames=32768,
348
 
                 protocol=avahi.PROTO_UNSPEC,
349
 
                 bus=None):
350
 
        self.interface = interface
351
 
        self.name = name
352
 
        self.type = servicetype
353
 
        self.port = port
354
 
        self.TXT = TXT if TXT is not None else []
355
 
        self.domain = domain
356
 
        self.host = host
357
 
        self.rename_count = 0
358
 
        self.max_renames = max_renames
359
 
        self.protocol = protocol
360
 
        self.group = None       # our entry group
361
 
        self.server = None
362
 
        self.bus = bus
363
 
        self.entry_group_state_changed_match = None
364
 
 
365
 
    def rename(self, remove=True):
366
 
        """Derived from the Avahi example code"""
367
 
        if self.rename_count >= self.max_renames:
368
 
            logger.critical("No suitable Zeroconf service name found"
369
 
                            " after %i retries, exiting.",
370
 
                            self.rename_count)
371
 
            raise AvahiServiceError("Too many renames")
372
 
        self.name = str(
373
 
            self.server.GetAlternativeServiceName(self.name))
374
 
        self.rename_count += 1
375
 
        logger.info("Changing Zeroconf service name to %r ...",
376
 
                    self.name)
377
 
        if remove:
378
 
            self.remove()
379
 
        try:
380
 
            self.add()
381
 
        except dbus.exceptions.DBusException as error:
382
 
            if (error.get_dbus_name()
383
 
                == "org.freedesktop.Avahi.CollisionError"):
384
 
                logger.info("Local Zeroconf service name collision.")
385
 
                return self.rename(remove=False)
386
 
            else:
387
 
                logger.critical("D-Bus Exception", exc_info=error)
388
 
                self.cleanup()
389
 
                os._exit(1)
390
 
 
391
 
    def remove(self):
392
 
        """Derived from the Avahi example code"""
393
 
        if self.entry_group_state_changed_match is not None:
394
 
            self.entry_group_state_changed_match.remove()
395
 
            self.entry_group_state_changed_match = None
396
 
        if self.group is not None:
397
 
            self.group.Reset()
398
 
 
399
 
    def add(self):
400
 
        """Derived from the Avahi example code"""
401
 
        self.remove()
402
 
        if self.group is None:
403
 
            self.group = dbus.Interface(
404
 
                self.bus.get_object(avahi.DBUS_NAME,
405
 
                                    self.server.EntryGroupNew()),
406
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
407
 
        self.entry_group_state_changed_match = (
408
 
            self.group.connect_to_signal(
409
 
                'StateChanged', self.entry_group_state_changed))
410
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
411
 
                     self.name, self.type)
412
 
        self.group.AddService(
413
 
            self.interface,
414
 
            self.protocol,
415
 
            dbus.UInt32(0),     # flags
416
 
            self.name, self.type,
417
 
            self.domain, self.host,
418
 
            dbus.UInt16(self.port),
419
 
            avahi.string_array_to_txt_array(self.TXT))
420
 
        self.group.Commit()
421
 
 
422
 
    def entry_group_state_changed(self, state, error):
423
 
        """Derived from the Avahi example code"""
424
 
        logger.debug("Avahi entry group state change: %i", state)
425
 
 
426
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
427
 
            logger.debug("Zeroconf service established.")
428
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
429
 
            logger.info("Zeroconf service name collision.")
430
 
            self.rename()
431
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
432
 
            logger.critical("Avahi: Error in group state changed %s",
433
 
                            str(error))
434
 
            raise AvahiGroupError("State changed: {!s}".format(error))
435
 
 
436
 
    def cleanup(self):
437
 
        """Derived from the Avahi example code"""
438
 
        if self.group is not None:
439
 
            try:
440
 
                self.group.Free()
441
 
            except (dbus.exceptions.UnknownMethodException,
442
 
                    dbus.exceptions.DBusException):
443
 
                pass
444
 
            self.group = None
445
 
        self.remove()
446
 
 
447
 
    def server_state_changed(self, state, error=None):
448
 
        """Derived from the Avahi example code"""
449
 
        logger.debug("Avahi server state change: %i", state)
450
 
        bad_states = {
451
 
            avahi.SERVER_INVALID: "Zeroconf server invalid",
452
 
            avahi.SERVER_REGISTERING: None,
453
 
            avahi.SERVER_COLLISION: "Zeroconf server name collision",
454
 
            avahi.SERVER_FAILURE: "Zeroconf server failure",
455
 
        }
456
 
        if state in bad_states:
457
 
            if bad_states[state] is not None:
458
 
                if error is None:
459
 
                    logger.error(bad_states[state])
460
 
                else:
461
 
                    logger.error(bad_states[state] + ": %r", error)
462
 
            self.cleanup()
463
 
        elif state == avahi.SERVER_RUNNING:
464
 
            try:
465
 
                self.add()
466
 
            except dbus.exceptions.DBusException as error:
467
 
                if (error.get_dbus_name()
468
 
                    == "org.freedesktop.Avahi.CollisionError"):
469
 
                    logger.info("Local Zeroconf service name"
470
 
                                " collision.")
471
 
                    return self.rename(remove=False)
472
 
                else:
473
 
                    logger.critical("D-Bus Exception", exc_info=error)
474
 
                    self.cleanup()
475
 
                    os._exit(1)
476
 
        else:
477
 
            if error is None:
478
 
                logger.debug("Unknown state: %r", state)
479
 
            else:
480
 
                logger.debug("Unknown state: %r: %r", state, error)
481
 
 
482
 
    def activate(self):
483
 
        """Derived from the Avahi example code"""
484
 
        if self.server is None:
485
 
            self.server = dbus.Interface(
486
 
                self.bus.get_object(avahi.DBUS_NAME,
487
 
                                    avahi.DBUS_PATH_SERVER,
488
 
                                    follow_name_owner_changes=True),
489
 
                avahi.DBUS_INTERFACE_SERVER)
490
 
        self.server.connect_to_signal("StateChanged",
491
 
                                      self.server_state_changed)
492
 
        self.server_state_changed(self.server.GetState())
493
 
 
494
 
 
495
 
class AvahiServiceToSyslog(AvahiService):
496
 
    def rename(self, *args, **kwargs):
497
 
        """Add the new name to the syslog messages"""
498
 
        ret = super(AvahiServiceToSyslog, self).rename(*args, **kwargs)
499
 
        syslogger.setFormatter(logging.Formatter(
500
 
            'Mandos ({}) [%(process)d]: %(levelname)s: %(message)s'
501
 
            .format(self.name)))
502
 
        return ret
503
 
 
504
 
 
505
 
# Pretend that we have a GnuTLS module
506
 
class gnutls(object):
507
 
    """This isn't so much a class as it is a module-like namespace."""
508
 
 
509
 
    library = ctypes.util.find_library("gnutls")
510
 
    if library is None:
511
 
        library = ctypes.util.find_library("gnutls-deb0")
512
 
    _library = ctypes.cdll.LoadLibrary(library)
513
 
    del library
514
 
 
515
 
    # Unless otherwise indicated, the constants and types below are
516
 
    # all from the gnutls/gnutls.h C header file.
517
 
 
518
 
    # Constants
519
 
    E_SUCCESS = 0
520
 
    E_INTERRUPTED = -52
521
 
    E_AGAIN = -28
522
 
    CRT_OPENPGP = 2
523
 
    CRT_RAWPK = 3
524
 
    CLIENT = 2
525
 
    SHUT_RDWR = 0
526
 
    CRD_CERTIFICATE = 1
527
 
    E_NO_CERTIFICATE_FOUND = -49
528
 
    X509_FMT_DER = 0
529
 
    NO_TICKETS = 1<<10
530
 
    ENABLE_RAWPK = 1<<18
531
 
    CTYPE_PEERS = 3
532
 
    KEYID_USE_SHA256 = 1        # gnutls/x509.h
533
 
    OPENPGP_FMT_RAW = 0         # gnutls/openpgp.h
534
 
 
535
 
    # Types
536
 
    class session_int(ctypes.Structure):
537
 
        _fields_ = []
538
 
    session_t = ctypes.POINTER(session_int)
539
 
 
540
 
    class certificate_credentials_st(ctypes.Structure):
541
 
        _fields_ = []
542
 
    certificate_credentials_t = ctypes.POINTER(
543
 
        certificate_credentials_st)
544
 
    certificate_type_t = ctypes.c_int
545
 
 
546
 
    class datum_t(ctypes.Structure):
547
 
        _fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),
548
 
                    ('size', ctypes.c_uint)]
549
 
 
550
 
    class openpgp_crt_int(ctypes.Structure):
551
 
        _fields_ = []
552
 
    openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)
553
 
    openpgp_crt_fmt_t = ctypes.c_int  # gnutls/openpgp.h
554
 
    log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)
555
 
    credentials_type_t = ctypes.c_int
556
 
    transport_ptr_t = ctypes.c_void_p
557
 
    close_request_t = ctypes.c_int
558
 
 
559
 
    # Exceptions
560
 
    class Error(Exception):
561
 
        def __init__(self, message=None, code=None, args=()):
562
 
            # Default usage is by a message string, but if a return
563
 
            # code is passed, convert it to a string with
564
 
            # gnutls.strerror()
565
 
            self.code = code
566
 
            if message is None and code is not None:
567
 
                message = gnutls.strerror(code)
568
 
            return super(gnutls.Error, self).__init__(
569
 
                message, *args)
570
 
 
571
 
    class CertificateSecurityError(Error):
572
 
        pass
573
 
 
574
 
    # Classes
575
 
    class Credentials(object):
576
 
        def __init__(self):
577
 
            self._c_object = gnutls.certificate_credentials_t()
578
 
            gnutls.certificate_allocate_credentials(
579
 
                ctypes.byref(self._c_object))
580
 
            self.type = gnutls.CRD_CERTIFICATE
581
 
 
582
 
        def __del__(self):
583
 
            gnutls.certificate_free_credentials(self._c_object)
584
 
 
585
 
    class ClientSession(object):
586
 
        def __init__(self, socket, credentials=None):
587
 
            self._c_object = gnutls.session_t()
588
 
            gnutls_flags = gnutls.CLIENT
589
 
            if gnutls.check_version(b"3.5.6"):
590
 
                gnutls_flags |= gnutls.NO_TICKETS
591
 
            if gnutls.has_rawpk:
592
 
                gnutls_flags |= gnutls.ENABLE_RAWPK
593
 
            gnutls.init(ctypes.byref(self._c_object), gnutls_flags)
594
 
            del gnutls_flags
595
 
            gnutls.set_default_priority(self._c_object)
596
 
            gnutls.transport_set_ptr(self._c_object, socket.fileno())
597
 
            gnutls.handshake_set_private_extensions(self._c_object,
598
 
                                                    True)
599
 
            self.socket = socket
600
 
            if credentials is None:
601
 
                credentials = gnutls.Credentials()
602
 
            gnutls.credentials_set(self._c_object, credentials.type,
603
 
                                   ctypes.cast(credentials._c_object,
604
 
                                               ctypes.c_void_p))
605
 
            self.credentials = credentials
606
 
 
607
 
        def __del__(self):
608
 
            gnutls.deinit(self._c_object)
609
 
 
610
 
        def handshake(self):
611
 
            return gnutls.handshake(self._c_object)
612
 
 
613
 
        def send(self, data):
614
 
            data = bytes(data)
615
 
            data_len = len(data)
616
 
            while data_len > 0:
617
 
                data_len -= gnutls.record_send(self._c_object,
618
 
                                               data[-data_len:],
619
 
                                               data_len)
620
 
 
621
 
        def bye(self):
622
 
            return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)
623
 
 
624
 
    # Error handling functions
625
 
    def _error_code(result):
626
 
        """A function to raise exceptions on errors, suitable
627
 
        for the 'restype' attribute on ctypes functions"""
628
 
        if result >= 0:
629
 
            return result
630
 
        if result == gnutls.E_NO_CERTIFICATE_FOUND:
631
 
            raise gnutls.CertificateSecurityError(code=result)
632
 
        raise gnutls.Error(code=result)
633
 
 
634
 
    def _retry_on_error(result, func, arguments):
635
 
        """A function to retry on some errors, suitable
636
 
        for the 'errcheck' attribute on ctypes functions"""
637
 
        while result < 0:
638
 
            if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):
639
 
                return _error_code(result)
640
 
            result = func(*arguments)
641
 
        return result
642
 
 
643
 
    # Unless otherwise indicated, the function declarations below are
644
 
    # all from the gnutls/gnutls.h C header file.
645
 
 
646
 
    # Functions
647
 
    priority_set_direct = _library.gnutls_priority_set_direct
648
 
    priority_set_direct.argtypes = [session_t, ctypes.c_char_p,
649
 
                                    ctypes.POINTER(ctypes.c_char_p)]
650
 
    priority_set_direct.restype = _error_code
651
 
 
652
 
    init = _library.gnutls_init
653
 
    init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]
654
 
    init.restype = _error_code
655
 
 
656
 
    set_default_priority = _library.gnutls_set_default_priority
657
 
    set_default_priority.argtypes = [session_t]
658
 
    set_default_priority.restype = _error_code
659
 
 
660
 
    record_send = _library.gnutls_record_send
661
 
    record_send.argtypes = [session_t, ctypes.c_void_p,
662
 
                            ctypes.c_size_t]
663
 
    record_send.restype = ctypes.c_ssize_t
664
 
    record_send.errcheck = _retry_on_error
665
 
 
666
 
    certificate_allocate_credentials = (
667
 
        _library.gnutls_certificate_allocate_credentials)
668
 
    certificate_allocate_credentials.argtypes = [
669
 
        ctypes.POINTER(certificate_credentials_t)]
670
 
    certificate_allocate_credentials.restype = _error_code
671
 
 
672
 
    certificate_free_credentials = (
673
 
        _library.gnutls_certificate_free_credentials)
674
 
    certificate_free_credentials.argtypes = [
675
 
        certificate_credentials_t]
676
 
    certificate_free_credentials.restype = None
677
 
 
678
 
    handshake_set_private_extensions = (
679
 
        _library.gnutls_handshake_set_private_extensions)
680
 
    handshake_set_private_extensions.argtypes = [session_t,
681
 
                                                 ctypes.c_int]
682
 
    handshake_set_private_extensions.restype = None
683
 
 
684
 
    credentials_set = _library.gnutls_credentials_set
685
 
    credentials_set.argtypes = [session_t, credentials_type_t,
686
 
                                ctypes.c_void_p]
687
 
    credentials_set.restype = _error_code
688
 
 
689
 
    strerror = _library.gnutls_strerror
690
 
    strerror.argtypes = [ctypes.c_int]
691
 
    strerror.restype = ctypes.c_char_p
692
 
 
693
 
    certificate_type_get = _library.gnutls_certificate_type_get
694
 
    certificate_type_get.argtypes = [session_t]
695
 
    certificate_type_get.restype = _error_code
696
 
 
697
 
    certificate_get_peers = _library.gnutls_certificate_get_peers
698
 
    certificate_get_peers.argtypes = [session_t,
699
 
                                      ctypes.POINTER(ctypes.c_uint)]
700
 
    certificate_get_peers.restype = ctypes.POINTER(datum_t)
701
 
 
702
 
    global_set_log_level = _library.gnutls_global_set_log_level
703
 
    global_set_log_level.argtypes = [ctypes.c_int]
704
 
    global_set_log_level.restype = None
705
 
 
706
 
    global_set_log_function = _library.gnutls_global_set_log_function
707
 
    global_set_log_function.argtypes = [log_func]
708
 
    global_set_log_function.restype = None
709
 
 
710
 
    deinit = _library.gnutls_deinit
711
 
    deinit.argtypes = [session_t]
712
 
    deinit.restype = None
713
 
 
714
 
    handshake = _library.gnutls_handshake
715
 
    handshake.argtypes = [session_t]
716
 
    handshake.restype = _error_code
717
 
    handshake.errcheck = _retry_on_error
718
 
 
719
 
    transport_set_ptr = _library.gnutls_transport_set_ptr
720
 
    transport_set_ptr.argtypes = [session_t, transport_ptr_t]
721
 
    transport_set_ptr.restype = None
722
 
 
723
 
    bye = _library.gnutls_bye
724
 
    bye.argtypes = [session_t, close_request_t]
725
 
    bye.restype = _error_code
726
 
    bye.errcheck = _retry_on_error
727
 
 
728
 
    check_version = _library.gnutls_check_version
729
 
    check_version.argtypes = [ctypes.c_char_p]
730
 
    check_version.restype = ctypes.c_char_p
731
 
 
732
 
    _need_version = b"3.3.0"
733
 
    if check_version(_need_version) is None:
734
 
        raise self.Error("Needs GnuTLS {} or later"
735
 
                         .format(_need_version))
736
 
 
737
 
    _tls_rawpk_version = b"3.6.6"
738
 
    has_rawpk = bool(check_version(_tls_rawpk_version))
739
 
 
740
 
    if has_rawpk:
741
 
        # Types
742
 
        class pubkey_st(ctypes.Structure):
743
 
            _fields = []
744
 
        pubkey_t = ctypes.POINTER(pubkey_st)
745
 
 
746
 
        x509_crt_fmt_t = ctypes.c_int
747
 
 
748
 
        # All the function declarations below are from gnutls/abstract.h
749
 
        pubkey_init = _library.gnutls_pubkey_init
750
 
        pubkey_init.argtypes = [ctypes.POINTER(pubkey_t)]
751
 
        pubkey_init.restype = _error_code
752
 
 
753
 
        pubkey_import = _library.gnutls_pubkey_import
754
 
        pubkey_import.argtypes = [pubkey_t, ctypes.POINTER(datum_t),
755
 
                                  x509_crt_fmt_t]
756
 
        pubkey_import.restype = _error_code
757
 
 
758
 
        pubkey_get_key_id = _library.gnutls_pubkey_get_key_id
759
 
        pubkey_get_key_id.argtypes = [pubkey_t, ctypes.c_int,
760
 
                                      ctypes.POINTER(ctypes.c_ubyte),
761
 
                                      ctypes.POINTER(ctypes.c_size_t)]
762
 
        pubkey_get_key_id.restype = _error_code
763
 
 
764
 
        pubkey_deinit = _library.gnutls_pubkey_deinit
765
 
        pubkey_deinit.argtypes = [pubkey_t]
766
 
        pubkey_deinit.restype = None
767
 
    else:
768
 
        # All the function declarations below are from gnutls/openpgp.h
769
 
 
770
 
        openpgp_crt_init = _library.gnutls_openpgp_crt_init
771
 
        openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]
772
 
        openpgp_crt_init.restype = _error_code
773
 
 
774
 
        openpgp_crt_import = _library.gnutls_openpgp_crt_import
775
 
        openpgp_crt_import.argtypes = [openpgp_crt_t,
776
 
                                       ctypes.POINTER(datum_t),
777
 
                                       openpgp_crt_fmt_t]
778
 
        openpgp_crt_import.restype = _error_code
779
 
 
780
 
        openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self
781
 
        openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,
782
 
                                            ctypes.POINTER(ctypes.c_uint)]
783
 
        openpgp_crt_verify_self.restype = _error_code
784
 
 
785
 
        openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit
786
 
        openpgp_crt_deinit.argtypes = [openpgp_crt_t]
787
 
        openpgp_crt_deinit.restype = None
788
 
 
789
 
        openpgp_crt_get_fingerprint = (
790
 
            _library.gnutls_openpgp_crt_get_fingerprint)
791
 
        openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,
792
 
                                                ctypes.c_void_p,
793
 
                                                ctypes.POINTER(
794
 
                                                    ctypes.c_size_t)]
795
 
        openpgp_crt_get_fingerprint.restype = _error_code
796
 
 
797
 
    if check_version(b"3.6.4"):
798
 
        certificate_type_get2 = _library.gnutls_certificate_type_get2
799
 
        certificate_type_get2.argtypes = [session_t, ctypes.c_int]
800
 
        certificate_type_get2.restype = _error_code
801
 
 
802
 
    # Remove non-public functions
803
 
    del _error_code, _retry_on_error
804
 
 
805
 
 
806
 
def call_pipe(connection,       # : multiprocessing.Connection
807
 
              func, *args, **kwargs):
808
 
    """This function is meant to be called by multiprocessing.Process
809
 
 
810
 
    This function runs func(*args, **kwargs), and writes the resulting
811
 
    return value on the provided multiprocessing.Connection.
812
 
    """
813
 
    connection.send(func(*args, **kwargs))
814
 
    connection.close()
 
30
 
 
31
# This variable is used to optionally bind to a specified interface.
 
32
# It is a global variable to fit in with the other variables from the
 
33
# Avahi server example code.
 
34
serviceInterface = avahi.IF_UNSPEC
 
35
# From the Avahi server example code:
 
36
serviceName = "Mandos"
 
37
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
38
servicePort = None                      # Not known at startup
 
39
serviceTXT = []                         # TXT record for the service
 
40
domain = ""                  # Domain to publish on, default to .local
 
41
host = ""          # Host to publish records for, default to localhost
 
42
group = None #our entry group
 
43
rename_count = 12       # Counter so we only rename after collisions a
 
44
                        # sensible number of times
 
45
# End of Avahi example code
815
46
 
816
47
 
817
48
class Client(object):
818
49
    """A representation of a client host served by this server.
819
 
 
820
50
    Attributes:
821
 
    approved:   bool(); 'None' if not yet approved/disapproved
822
 
    approval_delay: datetime.timedelta(); Time to wait for approval
823
 
    approval_duration: datetime.timedelta(); Duration of one approval
824
 
    checker:    subprocess.Popen(); a running checker process used
825
 
                                    to see if the client lives.
826
 
                                    'None' if no process is running.
827
 
    checker_callback_tag: a GLib event source tag, or None
828
 
    checker_command: string; External command which is run to check
829
 
                     if client lives.  %() expansions are done at
 
51
    name:      string; from the config file, used in log messages
 
52
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
53
                 uniquely identify the client
 
54
    secret:    bytestring; sent verbatim (over TLS) to client
 
55
    fqdn:      string (FQDN); available for use by the checker command
 
56
    created:   datetime.datetime()
 
57
    last_seen: datetime.datetime() or None if not yet seen
 
58
    timeout:   datetime.timedelta(); How long from last_seen until
 
59
                                     this client is invalid
 
60
    interval:  datetime.timedelta(); How often to start a new checker
 
61
    stop_hook: If set, called by stop() as stop_hook(self)
 
62
    checker:   subprocess.Popen(); a running checker process used
 
63
                                   to see if the client lives.
 
64
                                   Is None if no process is running.
 
65
    checker_initiator_tag: a gobject event source tag, or None
 
66
    stop_initiator_tag:    - '' -
 
67
    checker_callback_tag:  - '' -
 
68
    checker_command: string; External command which is run to check if
 
69
                     client lives.  %()s expansions are done at
830
70
                     runtime with vars(self) as dict, so that for
831
71
                     instance %(name)s can be used in the command.
832
 
    checker_initiator_tag: a GLib event source tag, or None
833
 
    created:    datetime.datetime(); (UTC) object creation
834
 
    client_structure: Object describing what attributes a client has
835
 
                      and is used for storing the client at exit
836
 
    current_checker_command: string; current running checker_command
837
 
    disable_initiator_tag: a GLib event source tag, or None
838
 
    enabled:    bool()
839
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
840
 
                 uniquely identify an OpenPGP client
841
 
    key_id: string (64 hexadecimal digits); used to uniquely identify
842
 
            a client using raw public keys
843
 
    host:       string; available for use by the checker command
844
 
    interval:   datetime.timedelta(); How often to start a new checker
845
 
    last_approval_request: datetime.datetime(); (UTC) or None
846
 
    last_checked_ok: datetime.datetime(); (UTC) or None
847
 
    last_checker_status: integer between 0 and 255 reflecting exit
848
 
                         status of last checker. -1 reflects crashed
849
 
                         checker, -2 means no checker completed yet.
850
 
    last_checker_signal: The signal which killed the last checker, if
851
 
                         last_checker_status is -1
852
 
    last_enabled: datetime.datetime(); (UTC) or None
853
 
    name:       string; from the config file, used in log messages and
854
 
                        D-Bus identifiers
855
 
    secret:     bytestring; sent verbatim (over TLS) to client
856
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
857
 
                                      until this client is disabled
858
 
    extended_timeout:   extra long timeout when secret has been sent
859
 
    runtime_expansions: Allowed attributes for runtime expansion.
860
 
    expires:    datetime.datetime(); time (UTC) when a client will be
861
 
                disabled, or None
862
 
    server_settings: The server_settings dict from main()
 
72
    Private attibutes:
 
73
    _timeout: Real variable for 'timeout'
 
74
    _interval: Real variable for 'interval'
 
75
    _timeout_milliseconds: Used by gobject.timeout_add()
 
76
    _interval_milliseconds: - '' -
863
77
    """
864
 
 
865
 
    runtime_expansions = ("approval_delay", "approval_duration",
866
 
                          "created", "enabled", "expires", "key_id",
867
 
                          "fingerprint", "host", "interval",
868
 
                          "last_approval_request", "last_checked_ok",
869
 
                          "last_enabled", "name", "timeout")
870
 
    client_defaults = {
871
 
        "timeout": "PT5M",
872
 
        "extended_timeout": "PT15M",
873
 
        "interval": "PT2M",
874
 
        "checker": "fping -q -- %%(host)s",
875
 
        "host": "",
876
 
        "approval_delay": "PT0S",
877
 
        "approval_duration": "PT1S",
878
 
        "approved_by_default": "True",
879
 
        "enabled": "True",
880
 
    }
881
 
 
882
 
    @staticmethod
883
 
    def config_parser(config):
884
 
        """Construct a new dict of client settings of this form:
885
 
        { client_name: {setting_name: value, ...}, ...}
886
 
        with exceptions for any special settings as defined above.
887
 
        NOTE: Must be a pure function. Must return the same result
888
 
        value given the same arguments.
889
 
        """
890
 
        settings = {}
891
 
        for client_name in config.sections():
892
 
            section = dict(config.items(client_name))
893
 
            client = settings[client_name] = {}
894
 
 
895
 
            client["host"] = section["host"]
896
 
            # Reformat values from string types to Python types
897
 
            client["approved_by_default"] = config.getboolean(
898
 
                client_name, "approved_by_default")
899
 
            client["enabled"] = config.getboolean(client_name,
900
 
                                                  "enabled")
901
 
 
902
 
            # Uppercase and remove spaces from key_id and fingerprint
903
 
            # for later comparison purposes with return value from the
904
 
            # key_id() and fingerprint() functions
905
 
            client["key_id"] = (section.get("key_id", "").upper()
906
 
                                .replace(" ", ""))
907
 
            client["fingerprint"] = (section["fingerprint"].upper()
908
 
                                     .replace(" ", ""))
909
 
            if "secret" in section:
910
 
                client["secret"] = codecs.decode(section["secret"]
911
 
                                                 .encode("utf-8"),
912
 
                                                 "base64")
913
 
            elif "secfile" in section:
914
 
                with open(os.path.expanduser(os.path.expandvars
915
 
                                             (section["secfile"])),
916
 
                          "rb") as secfile:
917
 
                    client["secret"] = secfile.read()
918
 
            else:
919
 
                raise TypeError("No secret or secfile for section {}"
920
 
                                .format(section))
921
 
            client["timeout"] = string_to_delta(section["timeout"])
922
 
            client["extended_timeout"] = string_to_delta(
923
 
                section["extended_timeout"])
924
 
            client["interval"] = string_to_delta(section["interval"])
925
 
            client["approval_delay"] = string_to_delta(
926
 
                section["approval_delay"])
927
 
            client["approval_duration"] = string_to_delta(
928
 
                section["approval_duration"])
929
 
            client["checker_command"] = section["checker"]
930
 
            client["last_approval_request"] = None
931
 
            client["last_checked_ok"] = None
932
 
            client["last_checker_status"] = -2
933
 
 
934
 
        return settings
935
 
 
936
 
    def __init__(self, settings, name=None, server_settings=None):
 
78
    def _set_timeout(self, timeout):
 
79
        "Setter function for 'timeout' attribute"
 
80
        self._timeout = timeout
 
81
        self._timeout_milliseconds = ((self.timeout.days
 
82
                                       * 24 * 60 * 60 * 1000)
 
83
                                      + (self.timeout.seconds * 1000)
 
84
                                      + (self.timeout.microseconds
 
85
                                         // 1000))
 
86
    timeout = property(lambda self: self._timeout,
 
87
                       _set_timeout)
 
88
    del _set_timeout
 
89
    def _set_interval(self, interval):
 
90
        "Setter function for 'interval' attribute"
 
91
        self._interval = interval
 
92
        self._interval_milliseconds = ((self.interval.days
 
93
                                        * 24 * 60 * 60 * 1000)
 
94
                                       + (self.interval.seconds
 
95
                                          * 1000)
 
96
                                       + (self.interval.microseconds
 
97
                                          // 1000))
 
98
    interval = property(lambda self: self._interval,
 
99
                        _set_interval)
 
100
    del _set_interval
 
101
    def __init__(self, name=None, options=None, stop_hook=None,
 
102
                 fingerprint=None, secret=None, secfile=None, fqdn=None,
 
103
                 timeout=None, interval=-1, checker=None):
937
104
        self.name = name
938
 
        if server_settings is None:
939
 
            server_settings = {}
940
 
        self.server_settings = server_settings
941
 
        # adding all client settings
942
 
        for setting, value in settings.items():
943
 
            setattr(self, setting, value)
944
 
 
945
 
        if self.enabled:
946
 
            if not hasattr(self, "last_enabled"):
947
 
                self.last_enabled = datetime.datetime.utcnow()
948
 
            if not hasattr(self, "expires"):
949
 
                self.expires = (datetime.datetime.utcnow()
950
 
                                + self.timeout)
951
 
        else:
952
 
            self.last_enabled = None
953
 
            self.expires = None
954
 
 
955
 
        logger.debug("Creating client %r", self.name)
956
 
        logger.debug("  Key ID: %s", self.key_id)
957
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
958
 
        self.created = settings.get("created",
959
 
                                    datetime.datetime.utcnow())
960
 
 
961
 
        # attributes specific for this server instance
 
105
        # Uppercase and remove spaces from fingerprint
 
106
        # for later comparison purposes with return value of
 
107
        # the fingerprint() function
 
108
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
109
        if secret:
 
110
            self.secret = secret.decode(u"base64")
 
111
        elif secfile:
 
112
            sf = open(secfile)
 
113
            self.secret = sf.read()
 
114
            sf.close()
 
115
        else:
 
116
            raise RuntimeError(u"No secret or secfile for client %s"
 
117
                               % self.name)
 
118
        self.fqdn = fqdn                # string
 
119
        self.created = datetime.datetime.now()
 
120
        self.last_seen = None
 
121
        if timeout is None:
 
122
            timeout = options.timeout
 
123
        self.timeout = timeout
 
124
        if interval == -1:
 
125
            interval = options.interval
 
126
        else:
 
127
            interval = string_to_delta(interval)
 
128
        self.interval = interval
 
129
        self.stop_hook = stop_hook
962
130
        self.checker = None
963
131
        self.checker_initiator_tag = None
964
 
        self.disable_initiator_tag = None
 
132
        self.stop_initiator_tag = None
965
133
        self.checker_callback_tag = None
966
 
        self.current_checker_command = None
967
 
        self.approved = None
968
 
        self.approvals_pending = 0
969
 
        self.changedstate = multiprocessing_manager.Condition(
970
 
            multiprocessing_manager.Lock())
971
 
        self.client_structure = [attr
972
 
                                 for attr in self.__dict__.keys()
973
 
                                 if not attr.startswith("_")]
974
 
        self.client_structure.append("client_structure")
975
 
 
976
 
        for name, t in inspect.getmembers(
977
 
                type(self), lambda obj: isinstance(obj, property)):
978
 
            if not name.startswith("_"):
979
 
                self.client_structure.append(name)
980
 
 
981
 
    # Send notice to process children that client state has changed
982
 
    def send_changedstate(self):
983
 
        with self.changedstate:
984
 
            self.changedstate.notify_all()
985
 
 
986
 
    def enable(self):
987
 
        """Start this client's checker and timeout hooks"""
988
 
        if getattr(self, "enabled", False):
989
 
            # Already enabled
990
 
            return
991
 
        self.expires = datetime.datetime.utcnow() + self.timeout
992
 
        self.enabled = True
993
 
        self.last_enabled = datetime.datetime.utcnow()
994
 
        self.init_checker()
995
 
        self.send_changedstate()
996
 
 
997
 
    def disable(self, quiet=True):
998
 
        """Disable this client."""
999
 
        if not getattr(self, "enabled", False):
1000
 
            return False
1001
 
        if not quiet:
1002
 
            logger.info("Disabling client %s", self.name)
1003
 
        if getattr(self, "disable_initiator_tag", None) is not None:
1004
 
            GLib.source_remove(self.disable_initiator_tag)
1005
 
            self.disable_initiator_tag = None
1006
 
        self.expires = None
1007
 
        if getattr(self, "checker_initiator_tag", None) is not None:
1008
 
            GLib.source_remove(self.checker_initiator_tag)
1009
 
            self.checker_initiator_tag = None
1010
 
        self.stop_checker()
1011
 
        self.enabled = False
1012
 
        if not quiet:
1013
 
            self.send_changedstate()
1014
 
        # Do not run this again if called by a GLib.timeout_add
1015
 
        return False
1016
 
 
1017
 
    def __del__(self):
1018
 
        self.disable()
1019
 
 
1020
 
    def init_checker(self):
 
134
        self.check_command = checker
 
135
    def start(self):
 
136
        """Start this clients checker and timeout hooks"""
1021
137
        # Schedule a new checker to be started an 'interval' from now,
1022
138
        # and every interval from then on.
1023
 
        if self.checker_initiator_tag is not None:
1024
 
            GLib.source_remove(self.checker_initiator_tag)
1025
 
        self.checker_initiator_tag = GLib.timeout_add(
1026
 
            int(self.interval.total_seconds() * 1000),
1027
 
            self.start_checker)
1028
 
        # Schedule a disable() when 'timeout' has passed
1029
 
        if self.disable_initiator_tag is not None:
1030
 
            GLib.source_remove(self.disable_initiator_tag)
1031
 
        self.disable_initiator_tag = GLib.timeout_add(
1032
 
            int(self.timeout.total_seconds() * 1000), self.disable)
 
139
        self.checker_initiator_tag = gobject.timeout_add\
 
140
                                     (self._interval_milliseconds,
 
141
                                      self.start_checker)
1033
142
        # Also start a new checker *right now*.
1034
143
        self.start_checker()
1035
 
 
1036
 
    def checker_callback(self, source, condition, connection,
1037
 
                         command):
 
144
        # Schedule a stop() when 'timeout' has passed
 
145
        self.stop_initiator_tag = gobject.timeout_add\
 
146
                                  (self._timeout_milliseconds,
 
147
                                   self.stop)
 
148
    def stop(self):
 
149
        """Stop this client.
 
150
        The possibility that this client might be restarted is left
 
151
        open, but not currently used."""
 
152
        if debug:
 
153
            sys.stderr.write(u"Stopping client %s\n" % self.name)
 
154
        self.secret = None
 
155
        if self.stop_initiator_tag:
 
156
            gobject.source_remove(self.stop_initiator_tag)
 
157
            self.stop_initiator_tag = None
 
158
        if self.checker_initiator_tag:
 
159
            gobject.source_remove(self.checker_initiator_tag)
 
160
            self.checker_initiator_tag = None
 
161
        self.stop_checker()
 
162
        if self.stop_hook:
 
163
            self.stop_hook(self)
 
164
        # Do not run this again if called by a gobject.timeout_add
 
165
        return False
 
166
    def __del__(self):
 
167
        # Some code duplication here and in stop()
 
168
        if hasattr(self, "stop_initiator_tag") \
 
169
               and self.stop_initiator_tag:
 
170
            gobject.source_remove(self.stop_initiator_tag)
 
171
            self.stop_initiator_tag = None
 
172
        if hasattr(self, "checker_initiator_tag") \
 
173
               and self.checker_initiator_tag:
 
174
            gobject.source_remove(self.checker_initiator_tag)
 
175
            self.checker_initiator_tag = None
 
176
        self.stop_checker()
 
177
    def checker_callback(self, pid, condition):
1038
178
        """The checker has completed, so take appropriate actions."""
 
179
        now = datetime.datetime.now()
 
180
        if os.WIFEXITED(condition) \
 
181
               and (os.WEXITSTATUS(condition) == 0):
 
182
            if debug:
 
183
                sys.stderr.write(u"Checker for %(name)s succeeded\n"
 
184
                                 % vars(self))
 
185
            self.last_seen = now
 
186
            gobject.source_remove(self.stop_initiator_tag)
 
187
            self.stop_initiator_tag = gobject.timeout_add\
 
188
                                      (self._timeout_milliseconds,
 
189
                                       self.stop)
 
190
        elif debug:
 
191
            if not os.WIFEXITED(condition):
 
192
                sys.stderr.write(u"Checker for %(name)s crashed?\n"
 
193
                                 % vars(self))
 
194
            else:
 
195
                sys.stderr.write(u"Checker for %(name)s failed\n"
 
196
                                 % vars(self))
 
197
        self.checker = None
1039
198
        self.checker_callback_tag = None
1040
 
        self.checker = None
1041
 
        # Read return code from connection (see call_pipe)
1042
 
        returncode = connection.recv()
1043
 
        connection.close()
1044
 
 
1045
 
        if returncode >= 0:
1046
 
            self.last_checker_status = returncode
1047
 
            self.last_checker_signal = None
1048
 
            if self.last_checker_status == 0:
1049
 
                logger.info("Checker for %(name)s succeeded",
1050
 
                            vars(self))
1051
 
                self.checked_ok()
1052
 
            else:
1053
 
                logger.info("Checker for %(name)s failed", vars(self))
1054
 
        else:
1055
 
            self.last_checker_status = -1
1056
 
            self.last_checker_signal = -returncode
1057
 
            logger.warning("Checker for %(name)s crashed?",
1058
 
                           vars(self))
1059
 
        return False
1060
 
 
1061
 
    def checked_ok(self):
1062
 
        """Assert that the client has been seen, alive and well."""
1063
 
        self.last_checked_ok = datetime.datetime.utcnow()
1064
 
        self.last_checker_status = 0
1065
 
        self.last_checker_signal = None
1066
 
        self.bump_timeout()
1067
 
 
1068
 
    def bump_timeout(self, timeout=None):
1069
 
        """Bump up the timeout for this client."""
1070
 
        if timeout is None:
1071
 
            timeout = self.timeout
1072
 
        if self.disable_initiator_tag is not None:
1073
 
            GLib.source_remove(self.disable_initiator_tag)
1074
 
            self.disable_initiator_tag = None
1075
 
        if getattr(self, "enabled", False):
1076
 
            self.disable_initiator_tag = GLib.timeout_add(
1077
 
                int(timeout.total_seconds() * 1000), self.disable)
1078
 
            self.expires = datetime.datetime.utcnow() + timeout
1079
 
 
1080
 
    def need_approval(self):
1081
 
        self.last_approval_request = datetime.datetime.utcnow()
1082
 
 
1083
199
    def start_checker(self):
1084
200
        """Start a new checker subprocess if one is not running.
1085
 
 
1086
201
        If a checker already exists, leave it running and do
1087
202
        nothing."""
1088
 
        # The reason for not killing a running checker is that if we
1089
 
        # did that, and if a checker (for some reason) started running
1090
 
        # slowly and taking more than 'interval' time, then the client
1091
 
        # would inevitably timeout, since no checker would get a
1092
 
        # chance to run to completion.  If we instead leave running
1093
 
        # checkers alone, the checker would have to take more time
1094
 
        # than 'timeout' for the client to be disabled, which is as it
1095
 
        # should be.
1096
 
 
1097
 
        if self.checker is not None and not self.checker.is_alive():
1098
 
            logger.warning("Checker was not alive; joining")
1099
 
            self.checker.join()
1100
 
            self.checker = None
1101
 
        # Start a new checker if needed
1102
203
        if self.checker is None:
1103
 
            # Escape attributes for the shell
1104
 
            escaped_attrs = {
1105
 
                attr: re.escape(str(getattr(self, attr)))
1106
 
                for attr in self.runtime_expansions}
1107
 
            try:
1108
 
                command = self.checker_command % escaped_attrs
1109
 
            except TypeError as error:
1110
 
                logger.error('Could not format string "%s"',
1111
 
                             self.checker_command,
1112
 
                             exc_info=error)
1113
 
                return True     # Try again later
1114
 
            self.current_checker_command = command
1115
 
            logger.info("Starting checker %r for %s", command,
1116
 
                        self.name)
1117
 
            # We don't need to redirect stdout and stderr, since
1118
 
            # in normal mode, that is already done by daemon(),
1119
 
            # and in debug mode we don't want to.  (Stdin is
1120
 
            # always replaced by /dev/null.)
1121
 
            # The exception is when not debugging but nevertheless
1122
 
            # running in the foreground; use the previously
1123
 
            # created wnull.
1124
 
            popen_args = {"close_fds": True,
1125
 
                          "shell": True,
1126
 
                          "cwd": "/"}
1127
 
            if (not self.server_settings["debug"]
1128
 
                and self.server_settings["foreground"]):
1129
 
                popen_args.update({"stdout": wnull,
1130
 
                                   "stderr": wnull})
1131
 
            pipe = multiprocessing.Pipe(duplex=False)
1132
 
            self.checker = multiprocessing.Process(
1133
 
                target=call_pipe,
1134
 
                args=(pipe[1], subprocess.call, command),
1135
 
                kwargs=popen_args)
1136
 
            self.checker.start()
1137
 
            self.checker_callback_tag = GLib.io_add_watch(
1138
 
                pipe[0].fileno(), GLib.IO_IN,
1139
 
                self.checker_callback, pipe[0], command)
1140
 
        # Re-run this periodically if run by GLib.timeout_add
 
204
            if debug:
 
205
                sys.stderr.write(u"Starting checker for %s\n"
 
206
                                 % self.name)
 
207
            try:
 
208
                command = self.check_command % self.fqdn
 
209
            except TypeError:
 
210
                escaped_attrs = dict((key, re.escape(str(val)))
 
211
                                     for key, val in
 
212
                                     vars(self).iteritems())
 
213
                command = self.check_command % escaped_attrs
 
214
            try:
 
215
                self.checker = subprocess.\
 
216
                               Popen(command,
 
217
                                     stdout=subprocess.PIPE,
 
218
                                     close_fds=True, shell=True,
 
219
                                     cwd="/")
 
220
                self.checker_callback_tag = gobject.\
 
221
                                            child_watch_add(self.checker.pid,
 
222
                                                            self.\
 
223
                                                            checker_callback)
 
224
            except subprocess.OSError, error:
 
225
                sys.stderr.write(u"Failed to start subprocess: %s\n"
 
226
                                 % error)
 
227
        # Re-run this periodically if run by gobject.timeout_add
1141
228
        return True
1142
 
 
1143
229
    def stop_checker(self):
1144
230
        """Force the checker process, if any, to stop."""
1145
 
        if self.checker_callback_tag:
1146
 
            GLib.source_remove(self.checker_callback_tag)
1147
 
            self.checker_callback_tag = None
1148
 
        if getattr(self, "checker", None) is None:
 
231
        if not hasattr(self, "checker") or self.checker is None:
1149
232
            return
1150
 
        logger.debug("Stopping checker for %(name)s", vars(self))
1151
 
        self.checker.terminate()
 
233
        gobject.source_remove(self.checker_callback_tag)
 
234
        self.checker_callback_tag = None
 
235
        os.kill(self.checker.pid, signal.SIGTERM)
 
236
        if self.checker.poll() is None:
 
237
            os.kill(self.checker.pid, signal.SIGKILL)
1152
238
        self.checker = None
1153
 
 
1154
 
 
1155
 
def dbus_service_property(dbus_interface,
1156
 
                          signature="v",
1157
 
                          access="readwrite",
1158
 
                          byte_arrays=False):
1159
 
    """Decorators for marking methods of a DBusObjectWithProperties to
1160
 
    become properties on the D-Bus.
1161
 
 
1162
 
    The decorated method will be called with no arguments by "Get"
1163
 
    and with one argument by "Set".
1164
 
 
1165
 
    The parameters, where they are supported, are the same as
1166
 
    dbus.service.method, except there is only "signature", since the
1167
 
    type from Get() and the type sent to Set() is the same.
1168
 
    """
1169
 
    # Encoding deeply encoded byte arrays is not supported yet by the
1170
 
    # "Set" method, so we fail early here:
1171
 
    if byte_arrays and signature != "ay":
1172
 
        raise ValueError("Byte arrays not supported for non-'ay'"
1173
 
                         " signature {!r}".format(signature))
1174
 
 
1175
 
    def decorator(func):
1176
 
        func._dbus_is_property = True
1177
 
        func._dbus_interface = dbus_interface
1178
 
        func._dbus_signature = signature
1179
 
        func._dbus_access = access
1180
 
        func._dbus_name = func.__name__
1181
 
        if func._dbus_name.endswith("_dbus_property"):
1182
 
            func._dbus_name = func._dbus_name[:-14]
1183
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays}
1184
 
        return func
1185
 
 
1186
 
    return decorator
1187
 
 
1188
 
 
1189
 
def dbus_interface_annotations(dbus_interface):
1190
 
    """Decorator for marking functions returning interface annotations
1191
 
 
1192
 
    Usage:
1193
 
 
1194
 
    @dbus_interface_annotations("org.example.Interface")
1195
 
    def _foo(self):  # Function name does not matter
1196
 
        return {"org.freedesktop.DBus.Deprecated": "true",
1197
 
                "org.freedesktop.DBus.Property.EmitsChangedSignal":
1198
 
                    "false"}
1199
 
    """
1200
 
 
1201
 
    def decorator(func):
1202
 
        func._dbus_is_interface = True
1203
 
        func._dbus_interface = dbus_interface
1204
 
        func._dbus_name = dbus_interface
1205
 
        return func
1206
 
 
1207
 
    return decorator
1208
 
 
1209
 
 
1210
 
def dbus_annotations(annotations):
1211
 
    """Decorator to annotate D-Bus methods, signals or properties
1212
 
    Usage:
1213
 
 
1214
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true",
1215
 
                       "org.freedesktop.DBus.Property."
1216
 
                       "EmitsChangedSignal": "false"})
1217
 
    @dbus_service_property("org.example.Interface", signature="b",
1218
 
                           access="r")
1219
 
    def Property_dbus_property(self):
1220
 
        return dbus.Boolean(False)
1221
 
 
1222
 
    See also the DBusObjectWithAnnotations class.
1223
 
    """
1224
 
 
1225
 
    def decorator(func):
1226
 
        func._dbus_annotations = annotations
1227
 
        return func
1228
 
 
1229
 
    return decorator
1230
 
 
1231
 
 
1232
 
class DBusPropertyException(dbus.exceptions.DBusException):
1233
 
    """A base class for D-Bus property-related exceptions
1234
 
    """
1235
 
    pass
1236
 
 
1237
 
 
1238
 
class DBusPropertyAccessException(DBusPropertyException):
1239
 
    """A property's access permissions disallows an operation.
1240
 
    """
1241
 
    pass
1242
 
 
1243
 
 
1244
 
class DBusPropertyNotFound(DBusPropertyException):
1245
 
    """An attempt was made to access a non-existing property.
1246
 
    """
1247
 
    pass
1248
 
 
1249
 
 
1250
 
class DBusObjectWithAnnotations(dbus.service.Object):
1251
 
    """A D-Bus object with annotations.
1252
 
 
1253
 
    Classes inheriting from this can use the dbus_annotations
1254
 
    decorator to add annotations to methods or signals.
1255
 
    """
1256
 
 
1257
 
    @staticmethod
1258
 
    def _is_dbus_thing(thing):
1259
 
        """Returns a function testing if an attribute is a D-Bus thing
1260
 
 
1261
 
        If called like _is_dbus_thing("method") it returns a function
1262
 
        suitable for use as predicate to inspect.getmembers().
1263
 
        """
1264
 
        return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),
1265
 
                                   False)
1266
 
 
1267
 
    def _get_all_dbus_things(self, thing):
1268
 
        """Returns a generator of (name, attribute) pairs
1269
 
        """
1270
 
        return ((getattr(athing.__get__(self), "_dbus_name", name),
1271
 
                 athing.__get__(self))
1272
 
                for cls in self.__class__.__mro__
1273
 
                for name, athing in
1274
 
                inspect.getmembers(cls, self._is_dbus_thing(thing)))
1275
 
 
1276
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1277
 
                         out_signature="s",
1278
 
                         path_keyword='object_path',
1279
 
                         connection_keyword='connection')
1280
 
    def Introspect(self, object_path, connection):
1281
 
        """Overloading of standard D-Bus method.
1282
 
 
1283
 
        Inserts annotation tags on methods and signals.
1284
 
        """
1285
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
1286
 
                                                   connection)
1287
 
        try:
1288
 
            document = xml.dom.minidom.parseString(xmlstring)
1289
 
 
1290
 
            for if_tag in document.getElementsByTagName("interface"):
1291
 
                # Add annotation tags
1292
 
                for typ in ("method", "signal"):
1293
 
                    for tag in if_tag.getElementsByTagName(typ):
1294
 
                        annots = dict()
1295
 
                        for name, prop in (self.
1296
 
                                           _get_all_dbus_things(typ)):
1297
 
                            if (name == tag.getAttribute("name")
1298
 
                                and prop._dbus_interface
1299
 
                                == if_tag.getAttribute("name")):
1300
 
                                annots.update(getattr(
1301
 
                                    prop, "_dbus_annotations", {}))
1302
 
                        for name, value in annots.items():
1303
 
                            ann_tag = document.createElement(
1304
 
                                "annotation")
1305
 
                            ann_tag.setAttribute("name", name)
1306
 
                            ann_tag.setAttribute("value", value)
1307
 
                            tag.appendChild(ann_tag)
1308
 
                # Add interface annotation tags
1309
 
                for annotation, value in dict(
1310
 
                    itertools.chain.from_iterable(
1311
 
                        annotations().items()
1312
 
                        for name, annotations
1313
 
                        in self._get_all_dbus_things("interface")
1314
 
                        if name == if_tag.getAttribute("name")
1315
 
                        )).items():
1316
 
                    ann_tag = document.createElement("annotation")
1317
 
                    ann_tag.setAttribute("name", annotation)
1318
 
                    ann_tag.setAttribute("value", value)
1319
 
                    if_tag.appendChild(ann_tag)
1320
 
                # Fix argument name for the Introspect method itself
1321
 
                if (if_tag.getAttribute("name")
1322
 
                    == dbus.INTROSPECTABLE_IFACE):
1323
 
                    for cn in if_tag.getElementsByTagName("method"):
1324
 
                        if cn.getAttribute("name") == "Introspect":
1325
 
                            for arg in cn.getElementsByTagName("arg"):
1326
 
                                if (arg.getAttribute("direction")
1327
 
                                    == "out"):
1328
 
                                    arg.setAttribute("name",
1329
 
                                                     "xml_data")
1330
 
            xmlstring = document.toxml("utf-8")
1331
 
            document.unlink()
1332
 
        except (AttributeError, xml.dom.DOMException,
1333
 
                xml.parsers.expat.ExpatError) as error:
1334
 
            logger.error("Failed to override Introspection method",
1335
 
                         exc_info=error)
1336
 
        return xmlstring
1337
 
 
1338
 
 
1339
 
class DBusObjectWithProperties(DBusObjectWithAnnotations):
1340
 
    """A D-Bus object with properties.
1341
 
 
1342
 
    Classes inheriting from this can use the dbus_service_property
1343
 
    decorator to expose methods as D-Bus properties.  It exposes the
1344
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
1345
 
    """
1346
 
 
1347
 
    def _get_dbus_property(self, interface_name, property_name):
1348
 
        """Returns a bound method if one exists which is a D-Bus
1349
 
        property with the specified name and interface.
1350
 
        """
1351
 
        for cls in self.__class__.__mro__:
1352
 
            for name, value in inspect.getmembers(
1353
 
                    cls, self._is_dbus_thing("property")):
1354
 
                if (value._dbus_name == property_name
1355
 
                    and value._dbus_interface == interface_name):
1356
 
                    return value.__get__(self)
1357
 
 
1358
 
        # No such property
1359
 
        raise DBusPropertyNotFound("{}:{}.{}".format(
1360
 
            self.dbus_object_path, interface_name, property_name))
1361
 
 
1362
 
    @classmethod
1363
 
    def _get_all_interface_names(cls):
1364
 
        """Get a sequence of all interfaces supported by an object"""
1365
 
        return (name for name in set(getattr(getattr(x, attr),
1366
 
                                             "_dbus_interface", None)
1367
 
                                     for x in (inspect.getmro(cls))
1368
 
                                     for attr in dir(x))
1369
 
                if name is not None)
1370
 
 
1371
 
    @dbus.service.method(dbus.PROPERTIES_IFACE,
1372
 
                         in_signature="ss",
1373
 
                         out_signature="v")
1374
 
    def Get(self, interface_name, property_name):
1375
 
        """Standard D-Bus property Get() method, see D-Bus standard.
1376
 
        """
1377
 
        prop = self._get_dbus_property(interface_name, property_name)
1378
 
        if prop._dbus_access == "write":
1379
 
            raise DBusPropertyAccessException(property_name)
1380
 
        value = prop()
1381
 
        if not hasattr(value, "variant_level"):
1382
 
            return value
1383
 
        return type(value)(value, variant_level=value.variant_level+1)
1384
 
 
1385
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
1386
 
    def Set(self, interface_name, property_name, value):
1387
 
        """Standard D-Bus property Set() method, see D-Bus standard.
1388
 
        """
1389
 
        prop = self._get_dbus_property(interface_name, property_name)
1390
 
        if prop._dbus_access == "read":
1391
 
            raise DBusPropertyAccessException(property_name)
1392
 
        if prop._dbus_get_args_options["byte_arrays"]:
1393
 
            # The byte_arrays option is not supported yet on
1394
 
            # signatures other than "ay".
1395
 
            if prop._dbus_signature != "ay":
1396
 
                raise ValueError("Byte arrays not supported for non-"
1397
 
                                 "'ay' signature {!r}"
1398
 
                                 .format(prop._dbus_signature))
1399
 
            value = dbus.ByteArray(b''.join(chr(byte)
1400
 
                                            for byte in value))
1401
 
        prop(value)
1402
 
 
1403
 
    @dbus.service.method(dbus.PROPERTIES_IFACE,
1404
 
                         in_signature="s",
1405
 
                         out_signature="a{sv}")
1406
 
    def GetAll(self, interface_name):
1407
 
        """Standard D-Bus property GetAll() method, see D-Bus
1408
 
        standard.
1409
 
 
1410
 
        Note: Will not include properties with access="write".
1411
 
        """
1412
 
        properties = {}
1413
 
        for name, prop in self._get_all_dbus_things("property"):
1414
 
            if (interface_name
1415
 
                and interface_name != prop._dbus_interface):
1416
 
                # Interface non-empty but did not match
1417
 
                continue
1418
 
            # Ignore write-only properties
1419
 
            if prop._dbus_access == "write":
1420
 
                continue
1421
 
            value = prop()
1422
 
            if not hasattr(value, "variant_level"):
1423
 
                properties[name] = value
1424
 
                continue
1425
 
            properties[name] = type(value)(
1426
 
                value, variant_level=value.variant_level + 1)
1427
 
        return dbus.Dictionary(properties, signature="sv")
1428
 
 
1429
 
    @dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")
1430
 
    def PropertiesChanged(self, interface_name, changed_properties,
1431
 
                          invalidated_properties):
1432
 
        """Standard D-Bus PropertiesChanged() signal, see D-Bus
1433
 
        standard.
1434
 
        """
1435
 
        pass
1436
 
 
1437
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1438
 
                         out_signature="s",
1439
 
                         path_keyword='object_path',
1440
 
                         connection_keyword='connection')
1441
 
    def Introspect(self, object_path, connection):
1442
 
        """Overloading of standard D-Bus method.
1443
 
 
1444
 
        Inserts property tags and interface annotation tags.
1445
 
        """
1446
 
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
1447
 
                                                         object_path,
1448
 
                                                         connection)
1449
 
        try:
1450
 
            document = xml.dom.minidom.parseString(xmlstring)
1451
 
 
1452
 
            def make_tag(document, name, prop):
1453
 
                e = document.createElement("property")
1454
 
                e.setAttribute("name", name)
1455
 
                e.setAttribute("type", prop._dbus_signature)
1456
 
                e.setAttribute("access", prop._dbus_access)
1457
 
                return e
1458
 
 
1459
 
            for if_tag in document.getElementsByTagName("interface"):
1460
 
                # Add property tags
1461
 
                for tag in (make_tag(document, name, prop)
1462
 
                            for name, prop
1463
 
                            in self._get_all_dbus_things("property")
1464
 
                            if prop._dbus_interface
1465
 
                            == if_tag.getAttribute("name")):
1466
 
                    if_tag.appendChild(tag)
1467
 
                # Add annotation tags for properties
1468
 
                for tag in if_tag.getElementsByTagName("property"):
1469
 
                    annots = dict()
1470
 
                    for name, prop in self._get_all_dbus_things(
1471
 
                            "property"):
1472
 
                        if (name == tag.getAttribute("name")
1473
 
                            and prop._dbus_interface
1474
 
                            == if_tag.getAttribute("name")):
1475
 
                            annots.update(getattr(
1476
 
                                prop, "_dbus_annotations", {}))
1477
 
                    for name, value in annots.items():
1478
 
                        ann_tag = document.createElement(
1479
 
                            "annotation")
1480
 
                        ann_tag.setAttribute("name", name)
1481
 
                        ann_tag.setAttribute("value", value)
1482
 
                        tag.appendChild(ann_tag)
1483
 
                # Add the names to the return values for the
1484
 
                # "org.freedesktop.DBus.Properties" methods
1485
 
                if (if_tag.getAttribute("name")
1486
 
                    == "org.freedesktop.DBus.Properties"):
1487
 
                    for cn in if_tag.getElementsByTagName("method"):
1488
 
                        if cn.getAttribute("name") == "Get":
1489
 
                            for arg in cn.getElementsByTagName("arg"):
1490
 
                                if (arg.getAttribute("direction")
1491
 
                                    == "out"):
1492
 
                                    arg.setAttribute("name", "value")
1493
 
                        elif cn.getAttribute("name") == "GetAll":
1494
 
                            for arg in cn.getElementsByTagName("arg"):
1495
 
                                if (arg.getAttribute("direction")
1496
 
                                    == "out"):
1497
 
                                    arg.setAttribute("name", "props")
1498
 
            xmlstring = document.toxml("utf-8")
1499
 
            document.unlink()
1500
 
        except (AttributeError, xml.dom.DOMException,
1501
 
                xml.parsers.expat.ExpatError) as error:
1502
 
            logger.error("Failed to override Introspection method",
1503
 
                         exc_info=error)
1504
 
        return xmlstring
1505
 
 
1506
 
 
1507
 
try:
1508
 
    dbus.OBJECT_MANAGER_IFACE
1509
 
except AttributeError:
1510
 
    dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"
1511
 
 
1512
 
 
1513
 
class DBusObjectWithObjectManager(DBusObjectWithAnnotations):
1514
 
    """A D-Bus object with an ObjectManager.
1515
 
 
1516
 
    Classes inheriting from this exposes the standard
1517
 
    GetManagedObjects call and the InterfacesAdded and
1518
 
    InterfacesRemoved signals on the standard
1519
 
    "org.freedesktop.DBus.ObjectManager" interface.
1520
 
 
1521
 
    Note: No signals are sent automatically; they must be sent
1522
 
    manually.
1523
 
    """
1524
 
    @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
1525
 
                         out_signature="a{oa{sa{sv}}}")
1526
 
    def GetManagedObjects(self):
1527
 
        """This function must be overridden"""
1528
 
        raise NotImplementedError()
1529
 
 
1530
 
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,
1531
 
                         signature="oa{sa{sv}}")
1532
 
    def InterfacesAdded(self, object_path, interfaces_and_properties):
1533
 
        pass
1534
 
 
1535
 
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature="oas")
1536
 
    def InterfacesRemoved(self, object_path, interfaces):
1537
 
        pass
1538
 
 
1539
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1540
 
                         out_signature="s",
1541
 
                         path_keyword='object_path',
1542
 
                         connection_keyword='connection')
1543
 
    def Introspect(self, object_path, connection):
1544
 
        """Overloading of standard D-Bus method.
1545
 
 
1546
 
        Override return argument name of GetManagedObjects to be
1547
 
        "objpath_interfaces_and_properties"
1548
 
        """
1549
 
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
1550
 
                                                         object_path,
1551
 
                                                         connection)
1552
 
        try:
1553
 
            document = xml.dom.minidom.parseString(xmlstring)
1554
 
 
1555
 
            for if_tag in document.getElementsByTagName("interface"):
1556
 
                # Fix argument name for the GetManagedObjects method
1557
 
                if (if_tag.getAttribute("name")
1558
 
                    == dbus.OBJECT_MANAGER_IFACE):
1559
 
                    for cn in if_tag.getElementsByTagName("method"):
1560
 
                        if (cn.getAttribute("name")
1561
 
                            == "GetManagedObjects"):
1562
 
                            for arg in cn.getElementsByTagName("arg"):
1563
 
                                if (arg.getAttribute("direction")
1564
 
                                    == "out"):
1565
 
                                    arg.setAttribute(
1566
 
                                        "name",
1567
 
                                        "objpath_interfaces"
1568
 
                                        "_and_properties")
1569
 
            xmlstring = document.toxml("utf-8")
1570
 
            document.unlink()
1571
 
        except (AttributeError, xml.dom.DOMException,
1572
 
                xml.parsers.expat.ExpatError) as error:
1573
 
            logger.error("Failed to override Introspection method",
1574
 
                         exc_info=error)
1575
 
        return xmlstring
1576
 
 
1577
 
 
1578
 
def datetime_to_dbus(dt, variant_level=0):
1579
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
1580
 
    if dt is None:
1581
 
        return dbus.String("", variant_level=variant_level)
1582
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
1583
 
 
1584
 
 
1585
 
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
1586
 
    """A class decorator; applied to a subclass of
1587
 
    dbus.service.Object, it will add alternate D-Bus attributes with
1588
 
    interface names according to the "alt_interface_names" mapping.
1589
 
    Usage:
1590
 
 
1591
 
    @alternate_dbus_interfaces({"org.example.Interface":
1592
 
                                    "net.example.AlternateInterface"})
1593
 
    class SampleDBusObject(dbus.service.Object):
1594
 
        @dbus.service.method("org.example.Interface")
1595
 
        def SampleDBusMethod():
1596
 
            pass
1597
 
 
1598
 
    The above "SampleDBusMethod" on "SampleDBusObject" will be
1599
 
    reachable via two interfaces: "org.example.Interface" and
1600
 
    "net.example.AlternateInterface", the latter of which will have
1601
 
    its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
1602
 
    "true", unless "deprecate" is passed with a False value.
1603
 
 
1604
 
    This works for methods and signals, and also for D-Bus properties
1605
 
    (from DBusObjectWithProperties) and interfaces (from the
1606
 
    dbus_interface_annotations decorator).
1607
 
    """
1608
 
 
1609
 
    def wrapper(cls):
1610
 
        for orig_interface_name, alt_interface_name in (
1611
 
                alt_interface_names.items()):
1612
 
            attr = {}
1613
 
            interface_names = set()
1614
 
            # Go though all attributes of the class
1615
 
            for attrname, attribute in inspect.getmembers(cls):
1616
 
                # Ignore non-D-Bus attributes, and D-Bus attributes
1617
 
                # with the wrong interface name
1618
 
                if (not hasattr(attribute, "_dbus_interface")
1619
 
                    or not attribute._dbus_interface.startswith(
1620
 
                        orig_interface_name)):
1621
 
                    continue
1622
 
                # Create an alternate D-Bus interface name based on
1623
 
                # the current name
1624
 
                alt_interface = attribute._dbus_interface.replace(
1625
 
                    orig_interface_name, alt_interface_name)
1626
 
                interface_names.add(alt_interface)
1627
 
                # Is this a D-Bus signal?
1628
 
                if getattr(attribute, "_dbus_is_signal", False):
1629
 
                    # Extract the original non-method undecorated
1630
 
                    # function by black magic
1631
 
                    if sys.version_info.major == 2:
1632
 
                        nonmethod_func = (dict(
1633
 
                            zip(attribute.func_code.co_freevars,
1634
 
                                attribute.__closure__))
1635
 
                                          ["func"].cell_contents)
1636
 
                    else:
1637
 
                        nonmethod_func = (dict(
1638
 
                            zip(attribute.__code__.co_freevars,
1639
 
                                attribute.__closure__))
1640
 
                                          ["func"].cell_contents)
1641
 
                    # Create a new, but exactly alike, function
1642
 
                    # object, and decorate it to be a new D-Bus signal
1643
 
                    # with the alternate D-Bus interface name
1644
 
                    new_function = copy_function(nonmethod_func)
1645
 
                    new_function = (dbus.service.signal(
1646
 
                        alt_interface,
1647
 
                        attribute._dbus_signature)(new_function))
1648
 
                    # Copy annotations, if any
1649
 
                    try:
1650
 
                        new_function._dbus_annotations = dict(
1651
 
                            attribute._dbus_annotations)
1652
 
                    except AttributeError:
1653
 
                        pass
1654
 
 
1655
 
                    # Define a creator of a function to call both the
1656
 
                    # original and alternate functions, so both the
1657
 
                    # original and alternate signals gets sent when
1658
 
                    # the function is called
1659
 
                    def fixscope(func1, func2):
1660
 
                        """This function is a scope container to pass
1661
 
                        func1 and func2 to the "call_both" function
1662
 
                        outside of its arguments"""
1663
 
 
1664
 
                        @functools.wraps(func2)
1665
 
                        def call_both(*args, **kwargs):
1666
 
                            """This function will emit two D-Bus
1667
 
                            signals by calling func1 and func2"""
1668
 
                            func1(*args, **kwargs)
1669
 
                            func2(*args, **kwargs)
1670
 
                        # Make wrapper function look like a D-Bus
1671
 
                        # signal
1672
 
                        for name, attr in inspect.getmembers(func2):
1673
 
                            if name.startswith("_dbus_"):
1674
 
                                setattr(call_both, name, attr)
1675
 
 
1676
 
                        return call_both
1677
 
                    # Create the "call_both" function and add it to
1678
 
                    # the class
1679
 
                    attr[attrname] = fixscope(attribute, new_function)
1680
 
                # Is this a D-Bus method?
1681
 
                elif getattr(attribute, "_dbus_is_method", False):
1682
 
                    # Create a new, but exactly alike, function
1683
 
                    # object.  Decorate it to be a new D-Bus method
1684
 
                    # with the alternate D-Bus interface name.  Add it
1685
 
                    # to the class.
1686
 
                    attr[attrname] = (
1687
 
                        dbus.service.method(
1688
 
                            alt_interface,
1689
 
                            attribute._dbus_in_signature,
1690
 
                            attribute._dbus_out_signature)
1691
 
                        (copy_function(attribute)))
1692
 
                    # Copy annotations, if any
1693
 
                    try:
1694
 
                        attr[attrname]._dbus_annotations = dict(
1695
 
                            attribute._dbus_annotations)
1696
 
                    except AttributeError:
1697
 
                        pass
1698
 
                # Is this a D-Bus property?
1699
 
                elif getattr(attribute, "_dbus_is_property", False):
1700
 
                    # Create a new, but exactly alike, function
1701
 
                    # object, and decorate it to be a new D-Bus
1702
 
                    # property with the alternate D-Bus interface
1703
 
                    # name.  Add it to the class.
1704
 
                    attr[attrname] = (dbus_service_property(
1705
 
                        alt_interface, attribute._dbus_signature,
1706
 
                        attribute._dbus_access,
1707
 
                        attribute._dbus_get_args_options
1708
 
                        ["byte_arrays"])
1709
 
                                      (copy_function(attribute)))
1710
 
                    # Copy annotations, if any
1711
 
                    try:
1712
 
                        attr[attrname]._dbus_annotations = dict(
1713
 
                            attribute._dbus_annotations)
1714
 
                    except AttributeError:
1715
 
                        pass
1716
 
                # Is this a D-Bus interface?
1717
 
                elif getattr(attribute, "_dbus_is_interface", False):
1718
 
                    # Create a new, but exactly alike, function
1719
 
                    # object.  Decorate it to be a new D-Bus interface
1720
 
                    # with the alternate D-Bus interface name.  Add it
1721
 
                    # to the class.
1722
 
                    attr[attrname] = (
1723
 
                        dbus_interface_annotations(alt_interface)
1724
 
                        (copy_function(attribute)))
1725
 
            if deprecate:
1726
 
                # Deprecate all alternate interfaces
1727
 
                iname = "_AlternateDBusNames_interface_annotation{}"
1728
 
                for interface_name in interface_names:
1729
 
 
1730
 
                    @dbus_interface_annotations(interface_name)
1731
 
                    def func(self):
1732
 
                        return {"org.freedesktop.DBus.Deprecated":
1733
 
                                "true"}
1734
 
                    # Find an unused name
1735
 
                    for aname in (iname.format(i)
1736
 
                                  for i in itertools.count()):
1737
 
                        if aname not in attr:
1738
 
                            attr[aname] = func
1739
 
                            break
1740
 
            if interface_names:
1741
 
                # Replace the class with a new subclass of it with
1742
 
                # methods, signals, etc. as created above.
1743
 
                if sys.version_info.major == 2:
1744
 
                    cls = type(b"{}Alternate".format(cls.__name__),
1745
 
                               (cls, ), attr)
1746
 
                else:
1747
 
                    cls = type("{}Alternate".format(cls.__name__),
1748
 
                               (cls, ), attr)
1749
 
        return cls
1750
 
 
1751
 
    return wrapper
1752
 
 
1753
 
 
1754
 
@alternate_dbus_interfaces({"se.recompile.Mandos":
1755
 
                            "se.bsnet.fukt.Mandos"})
1756
 
class ClientDBus(Client, DBusObjectWithProperties):
1757
 
    """A Client class using D-Bus
1758
 
 
1759
 
    Attributes:
1760
 
    dbus_object_path: dbus.ObjectPath
1761
 
    bus: dbus.SystemBus()
1762
 
    """
1763
 
 
1764
 
    runtime_expansions = (Client.runtime_expansions
1765
 
                          + ("dbus_object_path", ))
1766
 
 
1767
 
    _interface = "se.recompile.Mandos.Client"
1768
 
 
1769
 
    # dbus.service.Object doesn't use super(), so we can't either.
1770
 
 
1771
 
    def __init__(self, bus=None, *args, **kwargs):
1772
 
        self.bus = bus
1773
 
        Client.__init__(self, *args, **kwargs)
1774
 
        # Only now, when this client is initialized, can it show up on
1775
 
        # the D-Bus
1776
 
        client_object_name = str(self.name).translate(
1777
 
            {ord("."): ord("_"),
1778
 
             ord("-"): ord("_")})
1779
 
        self.dbus_object_path = dbus.ObjectPath(
1780
 
            "/clients/" + client_object_name)
1781
 
        DBusObjectWithProperties.__init__(self, self.bus,
1782
 
                                          self.dbus_object_path)
1783
 
 
1784
 
    def notifychangeproperty(transform_func, dbus_name,
1785
 
                             type_func=lambda x: x,
1786
 
                             variant_level=1,
1787
 
                             invalidate_only=False,
1788
 
                             _interface=_interface):
1789
 
        """ Modify a variable so that it's a property which announces
1790
 
        its changes to DBus.
1791
 
 
1792
 
        transform_fun: Function that takes a value and a variant_level
1793
 
                       and transforms it to a D-Bus type.
1794
 
        dbus_name: D-Bus name of the variable
1795
 
        type_func: Function that transform the value before sending it
1796
 
                   to the D-Bus.  Default: no transform
1797
 
        variant_level: D-Bus variant level.  Default: 1
1798
 
        """
1799
 
        attrname = "_{}".format(dbus_name)
1800
 
 
1801
 
        def setter(self, value):
1802
 
            if hasattr(self, "dbus_object_path"):
1803
 
                if (not hasattr(self, attrname) or
1804
 
                    type_func(getattr(self, attrname, None))
1805
 
                    != type_func(value)):
1806
 
                    if invalidate_only:
1807
 
                        self.PropertiesChanged(
1808
 
                            _interface, dbus.Dictionary(),
1809
 
                            dbus.Array((dbus_name, )))
1810
 
                    else:
1811
 
                        dbus_value = transform_func(
1812
 
                            type_func(value),
1813
 
                            variant_level=variant_level)
1814
 
                        self.PropertyChanged(dbus.String(dbus_name),
1815
 
                                             dbus_value)
1816
 
                        self.PropertiesChanged(
1817
 
                            _interface,
1818
 
                            dbus.Dictionary({dbus.String(dbus_name):
1819
 
                                             dbus_value}),
1820
 
                            dbus.Array())
1821
 
            setattr(self, attrname, value)
1822
 
 
1823
 
        return property(lambda self: getattr(self, attrname), setter)
1824
 
 
1825
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
1826
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
1827
 
                                             "ApprovalPending",
1828
 
                                             type_func=bool)
1829
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1830
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
1831
 
                                        "LastEnabled")
1832
 
    checker = notifychangeproperty(
1833
 
        dbus.Boolean, "CheckerRunning",
1834
 
        type_func=lambda checker: checker is not None)
1835
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
1836
 
                                           "LastCheckedOK")
1837
 
    last_checker_status = notifychangeproperty(dbus.Int16,
1838
 
                                               "LastCheckerStatus")
1839
 
    last_approval_request = notifychangeproperty(
1840
 
        datetime_to_dbus, "LastApprovalRequest")
1841
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
1842
 
                                               "ApprovedByDefault")
1843
 
    approval_delay = notifychangeproperty(
1844
 
        dbus.UInt64, "ApprovalDelay",
1845
 
        type_func=lambda td: td.total_seconds() * 1000)
1846
 
    approval_duration = notifychangeproperty(
1847
 
        dbus.UInt64, "ApprovalDuration",
1848
 
        type_func=lambda td: td.total_seconds() * 1000)
1849
 
    host = notifychangeproperty(dbus.String, "Host")
1850
 
    timeout = notifychangeproperty(
1851
 
        dbus.UInt64, "Timeout",
1852
 
        type_func=lambda td: td.total_seconds() * 1000)
1853
 
    extended_timeout = notifychangeproperty(
1854
 
        dbus.UInt64, "ExtendedTimeout",
1855
 
        type_func=lambda td: td.total_seconds() * 1000)
1856
 
    interval = notifychangeproperty(
1857
 
        dbus.UInt64, "Interval",
1858
 
        type_func=lambda td: td.total_seconds() * 1000)
1859
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
1860
 
    secret = notifychangeproperty(dbus.ByteArray, "Secret",
1861
 
                                  invalidate_only=True)
1862
 
 
1863
 
    del notifychangeproperty
1864
 
 
1865
 
    def __del__(self, *args, **kwargs):
1866
 
        try:
1867
 
            self.remove_from_connection()
1868
 
        except LookupError:
1869
 
            pass
1870
 
        if hasattr(DBusObjectWithProperties, "__del__"):
1871
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
1872
 
        Client.__del__(self, *args, **kwargs)
1873
 
 
1874
 
    def checker_callback(self, source, condition,
1875
 
                         connection, command, *args, **kwargs):
1876
 
        ret = Client.checker_callback(self, source, condition,
1877
 
                                      connection, command, *args,
1878
 
                                      **kwargs)
1879
 
        exitstatus = self.last_checker_status
1880
 
        if exitstatus >= 0:
1881
 
            # Emit D-Bus signal
1882
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
1883
 
                                  # This is specific to GNU libC
1884
 
                                  dbus.Int64(exitstatus << 8),
1885
 
                                  dbus.String(command))
1886
 
        else:
1887
 
            # Emit D-Bus signal
1888
 
            self.CheckerCompleted(dbus.Int16(-1),
1889
 
                                  dbus.Int64(
1890
 
                                      # This is specific to GNU libC
1891
 
                                      (exitstatus << 8)
1892
 
                                      | self.last_checker_signal),
1893
 
                                  dbus.String(command))
1894
 
        return ret
1895
 
 
1896
 
    def start_checker(self, *args, **kwargs):
1897
 
        old_checker_pid = getattr(self.checker, "pid", None)
1898
 
        r = Client.start_checker(self, *args, **kwargs)
1899
 
        # Only if new checker process was started
1900
 
        if (self.checker is not None
1901
 
            and old_checker_pid != self.checker.pid):
1902
 
            # Emit D-Bus signal
1903
 
            self.CheckerStarted(self.current_checker_command)
1904
 
        return r
1905
 
 
1906
 
    def _reset_approved(self):
1907
 
        self.approved = None
1908
 
        return False
1909
 
 
1910
 
    def approve(self, value=True):
1911
 
        self.approved = value
1912
 
        GLib.timeout_add(int(self.approval_duration.total_seconds()
1913
 
                             * 1000), self._reset_approved)
1914
 
        self.send_changedstate()
1915
 
 
1916
 
    #  D-Bus methods, signals & properties
1917
 
 
1918
 
    #  Interfaces
1919
 
 
1920
 
    #  Signals
1921
 
 
1922
 
    # CheckerCompleted - signal
1923
 
    @dbus.service.signal(_interface, signature="nxs")
1924
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
1925
 
        "D-Bus signal"
1926
 
        pass
1927
 
 
1928
 
    # CheckerStarted - signal
1929
 
    @dbus.service.signal(_interface, signature="s")
1930
 
    def CheckerStarted(self, command):
1931
 
        "D-Bus signal"
1932
 
        pass
1933
 
 
1934
 
    # PropertyChanged - signal
1935
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1936
 
    @dbus.service.signal(_interface, signature="sv")
1937
 
    def PropertyChanged(self, property, value):
1938
 
        "D-Bus signal"
1939
 
        pass
1940
 
 
1941
 
    # GotSecret - signal
1942
 
    @dbus.service.signal(_interface)
1943
 
    def GotSecret(self):
1944
 
        """D-Bus signal
1945
 
        Is sent after a successful transfer of secret from the Mandos
1946
 
        server to mandos-client
1947
 
        """
1948
 
        pass
1949
 
 
1950
 
    # Rejected - signal
1951
 
    @dbus.service.signal(_interface, signature="s")
1952
 
    def Rejected(self, reason):
1953
 
        "D-Bus signal"
1954
 
        pass
1955
 
 
1956
 
    # NeedApproval - signal
1957
 
    @dbus.service.signal(_interface, signature="tb")
1958
 
    def NeedApproval(self, timeout, default):
1959
 
        "D-Bus signal"
1960
 
        return self.need_approval()
1961
 
 
1962
 
    #  Methods
1963
 
 
1964
 
    # Approve - method
1965
 
    @dbus.service.method(_interface, in_signature="b")
1966
 
    def Approve(self, value):
1967
 
        self.approve(value)
1968
 
 
1969
 
    # CheckedOK - method
1970
 
    @dbus.service.method(_interface)
1971
 
    def CheckedOK(self):
1972
 
        self.checked_ok()
1973
 
 
1974
 
    # Enable - method
1975
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1976
 
    @dbus.service.method(_interface)
1977
 
    def Enable(self):
1978
 
        "D-Bus method"
1979
 
        self.enable()
1980
 
 
1981
 
    # StartChecker - method
1982
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1983
 
    @dbus.service.method(_interface)
1984
 
    def StartChecker(self):
1985
 
        "D-Bus method"
1986
 
        self.start_checker()
1987
 
 
1988
 
    # Disable - method
1989
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1990
 
    @dbus.service.method(_interface)
1991
 
    def Disable(self):
1992
 
        "D-Bus method"
1993
 
        self.disable()
1994
 
 
1995
 
    # StopChecker - method
1996
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1997
 
    @dbus.service.method(_interface)
1998
 
    def StopChecker(self):
1999
 
        self.stop_checker()
2000
 
 
2001
 
    #  Properties
2002
 
 
2003
 
    # ApprovalPending - property
2004
 
    @dbus_service_property(_interface, signature="b", access="read")
2005
 
    def ApprovalPending_dbus_property(self):
2006
 
        return dbus.Boolean(bool(self.approvals_pending))
2007
 
 
2008
 
    # ApprovedByDefault - property
2009
 
    @dbus_service_property(_interface,
2010
 
                           signature="b",
2011
 
                           access="readwrite")
2012
 
    def ApprovedByDefault_dbus_property(self, value=None):
2013
 
        if value is None:       # get
2014
 
            return dbus.Boolean(self.approved_by_default)
2015
 
        self.approved_by_default = bool(value)
2016
 
 
2017
 
    # ApprovalDelay - property
2018
 
    @dbus_service_property(_interface,
2019
 
                           signature="t",
2020
 
                           access="readwrite")
2021
 
    def ApprovalDelay_dbus_property(self, value=None):
2022
 
        if value is None:       # get
2023
 
            return dbus.UInt64(self.approval_delay.total_seconds()
2024
 
                               * 1000)
2025
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
2026
 
 
2027
 
    # ApprovalDuration - property
2028
 
    @dbus_service_property(_interface,
2029
 
                           signature="t",
2030
 
                           access="readwrite")
2031
 
    def ApprovalDuration_dbus_property(self, value=None):
2032
 
        if value is None:       # get
2033
 
            return dbus.UInt64(self.approval_duration.total_seconds()
2034
 
                               * 1000)
2035
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
2036
 
 
2037
 
    # Name - property
2038
 
    @dbus_annotations(
2039
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2040
 
    @dbus_service_property(_interface, signature="s", access="read")
2041
 
    def Name_dbus_property(self):
2042
 
        return dbus.String(self.name)
2043
 
 
2044
 
    # KeyID - property
2045
 
    @dbus_annotations(
2046
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2047
 
    @dbus_service_property(_interface, signature="s", access="read")
2048
 
    def KeyID_dbus_property(self):
2049
 
        return dbus.String(self.key_id)
2050
 
 
2051
 
    # Fingerprint - property
2052
 
    @dbus_annotations(
2053
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2054
 
    @dbus_service_property(_interface, signature="s", access="read")
2055
 
    def Fingerprint_dbus_property(self):
2056
 
        return dbus.String(self.fingerprint)
2057
 
 
2058
 
    # Host - property
2059
 
    @dbus_service_property(_interface,
2060
 
                           signature="s",
2061
 
                           access="readwrite")
2062
 
    def Host_dbus_property(self, value=None):
2063
 
        if value is None:       # get
2064
 
            return dbus.String(self.host)
2065
 
        self.host = str(value)
2066
 
 
2067
 
    # Created - property
2068
 
    @dbus_annotations(
2069
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2070
 
    @dbus_service_property(_interface, signature="s", access="read")
2071
 
    def Created_dbus_property(self):
2072
 
        return datetime_to_dbus(self.created)
2073
 
 
2074
 
    # LastEnabled - property
2075
 
    @dbus_service_property(_interface, signature="s", access="read")
2076
 
    def LastEnabled_dbus_property(self):
2077
 
        return datetime_to_dbus(self.last_enabled)
2078
 
 
2079
 
    # Enabled - property
2080
 
    @dbus_service_property(_interface,
2081
 
                           signature="b",
2082
 
                           access="readwrite")
2083
 
    def Enabled_dbus_property(self, value=None):
2084
 
        if value is None:       # get
2085
 
            return dbus.Boolean(self.enabled)
2086
 
        if value:
2087
 
            self.enable()
2088
 
        else:
2089
 
            self.disable()
2090
 
 
2091
 
    # LastCheckedOK - property
2092
 
    @dbus_service_property(_interface,
2093
 
                           signature="s",
2094
 
                           access="readwrite")
2095
 
    def LastCheckedOK_dbus_property(self, value=None):
2096
 
        if value is not None:
2097
 
            self.checked_ok()
2098
 
            return
2099
 
        return datetime_to_dbus(self.last_checked_ok)
2100
 
 
2101
 
    # LastCheckerStatus - property
2102
 
    @dbus_service_property(_interface, signature="n", access="read")
2103
 
    def LastCheckerStatus_dbus_property(self):
2104
 
        return dbus.Int16(self.last_checker_status)
2105
 
 
2106
 
    # Expires - property
2107
 
    @dbus_service_property(_interface, signature="s", access="read")
2108
 
    def Expires_dbus_property(self):
2109
 
        return datetime_to_dbus(self.expires)
2110
 
 
2111
 
    # LastApprovalRequest - property
2112
 
    @dbus_service_property(_interface, signature="s", access="read")
2113
 
    def LastApprovalRequest_dbus_property(self):
2114
 
        return datetime_to_dbus(self.last_approval_request)
2115
 
 
2116
 
    # Timeout - property
2117
 
    @dbus_service_property(_interface,
2118
 
                           signature="t",
2119
 
                           access="readwrite")
2120
 
    def Timeout_dbus_property(self, value=None):
2121
 
        if value is None:       # get
2122
 
            return dbus.UInt64(self.timeout.total_seconds() * 1000)
2123
 
        old_timeout = self.timeout
2124
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
2125
 
        # Reschedule disabling
2126
 
        if self.enabled:
2127
 
            now = datetime.datetime.utcnow()
2128
 
            self.expires += self.timeout - old_timeout
2129
 
            if self.expires <= now:
2130
 
                # The timeout has passed
2131
 
                self.disable()
2132
 
            else:
2133
 
                if (getattr(self, "disable_initiator_tag", None)
2134
 
                    is None):
2135
 
                    return
2136
 
                GLib.source_remove(self.disable_initiator_tag)
2137
 
                self.disable_initiator_tag = GLib.timeout_add(
2138
 
                    int((self.expires - now).total_seconds() * 1000),
2139
 
                    self.disable)
2140
 
 
2141
 
    # ExtendedTimeout - property
2142
 
    @dbus_service_property(_interface,
2143
 
                           signature="t",
2144
 
                           access="readwrite")
2145
 
    def ExtendedTimeout_dbus_property(self, value=None):
2146
 
        if value is None:       # get
2147
 
            return dbus.UInt64(self.extended_timeout.total_seconds()
2148
 
                               * 1000)
2149
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
2150
 
 
2151
 
    # Interval - property
2152
 
    @dbus_service_property(_interface,
2153
 
                           signature="t",
2154
 
                           access="readwrite")
2155
 
    def Interval_dbus_property(self, value=None):
2156
 
        if value is None:       # get
2157
 
            return dbus.UInt64(self.interval.total_seconds() * 1000)
2158
 
        self.interval = datetime.timedelta(0, 0, 0, value)
2159
 
        if getattr(self, "checker_initiator_tag", None) is None:
2160
 
            return
2161
 
        if self.enabled:
2162
 
            # Reschedule checker run
2163
 
            GLib.source_remove(self.checker_initiator_tag)
2164
 
            self.checker_initiator_tag = GLib.timeout_add(
2165
 
                value, self.start_checker)
2166
 
            self.start_checker()  # Start one now, too
2167
 
 
2168
 
    # Checker - property
2169
 
    @dbus_service_property(_interface,
2170
 
                           signature="s",
2171
 
                           access="readwrite")
2172
 
    def Checker_dbus_property(self, value=None):
2173
 
        if value is None:       # get
2174
 
            return dbus.String(self.checker_command)
2175
 
        self.checker_command = str(value)
2176
 
 
2177
 
    # CheckerRunning - property
2178
 
    @dbus_service_property(_interface,
2179
 
                           signature="b",
2180
 
                           access="readwrite")
2181
 
    def CheckerRunning_dbus_property(self, value=None):
2182
 
        if value is None:       # get
2183
 
            return dbus.Boolean(self.checker is not None)
2184
 
        if value:
2185
 
            self.start_checker()
2186
 
        else:
2187
 
            self.stop_checker()
2188
 
 
2189
 
    # ObjectPath - property
2190
 
    @dbus_annotations(
2191
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",
2192
 
         "org.freedesktop.DBus.Deprecated": "true"})
2193
 
    @dbus_service_property(_interface, signature="o", access="read")
2194
 
    def ObjectPath_dbus_property(self):
2195
 
        return self.dbus_object_path  # is already a dbus.ObjectPath
2196
 
 
2197
 
    # Secret = property
2198
 
    @dbus_annotations(
2199
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal":
2200
 
         "invalidates"})
2201
 
    @dbus_service_property(_interface,
2202
 
                           signature="ay",
2203
 
                           access="write",
2204
 
                           byte_arrays=True)
2205
 
    def Secret_dbus_property(self, value):
2206
 
        self.secret = bytes(value)
2207
 
 
2208
 
    del _interface
2209
 
 
2210
 
 
2211
 
class ProxyClient(object):
2212
 
    def __init__(self, child_pipe, key_id, fpr, address):
2213
 
        self._pipe = child_pipe
2214
 
        self._pipe.send(('init', key_id, fpr, address))
2215
 
        if not self._pipe.recv():
2216
 
            raise KeyError(key_id or fpr)
2217
 
 
2218
 
    def __getattribute__(self, name):
2219
 
        if name == '_pipe':
2220
 
            return super(ProxyClient, self).__getattribute__(name)
2221
 
        self._pipe.send(('getattr', name))
2222
 
        data = self._pipe.recv()
2223
 
        if data[0] == 'data':
2224
 
            return data[1]
2225
 
        if data[0] == 'function':
2226
 
 
2227
 
            def func(*args, **kwargs):
2228
 
                self._pipe.send(('funcall', name, args, kwargs))
2229
 
                return self._pipe.recv()[1]
2230
 
 
2231
 
            return func
2232
 
 
2233
 
    def __setattr__(self, name, value):
2234
 
        if name == '_pipe':
2235
 
            return super(ProxyClient, self).__setattr__(name, value)
2236
 
        self._pipe.send(('setattr', name, value))
2237
 
 
2238
 
 
2239
 
class ClientHandler(socketserver.BaseRequestHandler, object):
2240
 
    """A class to handle client connections.
2241
 
 
2242
 
    Instantiated once for each connection to handle it.
 
239
    def still_valid(self, now=None):
 
240
        """Has the timeout not yet passed for this client?"""
 
241
        if now is None:
 
242
            now = datetime.datetime.now()
 
243
        if self.last_seen is None:
 
244
            return now < (self.created + self.timeout)
 
245
        else:
 
246
            return now < (self.last_seen + self.timeout)
 
247
 
 
248
 
 
249
def peer_certificate(session):
 
250
    # If not an OpenPGP certificate...
 
251
    if gnutls.library.functions.gnutls_certificate_type_get\
 
252
            (session._c_object) \
 
253
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
254
        # ...do the normal thing
 
255
        return session.peer_certificate
 
256
    list_size = ctypes.c_uint()
 
257
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
258
        (session._c_object, ctypes.byref(list_size))
 
259
    if list_size.value == 0:
 
260
        return None
 
261
    cert = cert_list[0]
 
262
    return ctypes.string_at(cert.data, cert.size)
 
263
 
 
264
 
 
265
def fingerprint(openpgp):
 
266
    # New empty GnuTLS certificate
 
267
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
268
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
269
        (ctypes.byref(crt))
 
270
    # New GnuTLS "datum" with the OpenPGP public key
 
271
    datum = gnutls.library.types.gnutls_datum_t\
 
272
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
273
                     ctypes.POINTER(ctypes.c_ubyte)),
 
274
         ctypes.c_uint(len(openpgp)))
 
275
    # Import the OpenPGP public key into the certificate
 
276
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
277
        (crt,
 
278
         ctypes.byref(datum),
 
279
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
280
    # New buffer for the fingerprint
 
281
    buffer = ctypes.create_string_buffer(20)
 
282
    buffer_length = ctypes.c_size_t()
 
283
    # Get the fingerprint from the certificate into the buffer
 
284
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
285
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
286
    # Deinit the certificate
 
287
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
288
    # Convert the buffer to a Python bytestring
 
289
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
290
    # Convert the bytestring to hexadecimal notation
 
291
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
292
    return hex_fpr
 
293
 
 
294
 
 
295
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
296
    """A TCP request handler class.
 
297
    Instantiated by IPv6_TCPServer for each request to handle it.
2243
298
    Note: This will run in its own forked process."""
2244
 
 
 
299
    
2245
300
    def handle(self):
2246
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
2247
 
            logger.info("TCP connection from: %s",
2248
 
                        str(self.client_address))
2249
 
            logger.debug("Pipe FD: %d",
2250
 
                         self.server.child_pipe.fileno())
2251
 
 
2252
 
            session = gnutls.ClientSession(self.request)
2253
 
 
2254
 
            # priority = ':'.join(("NONE", "+VERS-TLS1.1",
2255
 
            #                       "+AES-256-CBC", "+SHA1",
2256
 
            #                       "+COMP-NULL", "+CTYPE-OPENPGP",
2257
 
            #                       "+DHE-DSS"))
2258
 
            # Use a fallback default, since this MUST be set.
2259
 
            priority = self.server.gnutls_priority
2260
 
            if priority is None:
2261
 
                priority = "NORMAL"
2262
 
            gnutls.priority_set_direct(session._c_object,
2263
 
                                       priority.encode("utf-8"),
2264
 
                                       None)
2265
 
 
2266
 
            # Start communication using the Mandos protocol
2267
 
            # Get protocol number
2268
 
            line = self.request.makefile().readline()
2269
 
            logger.debug("Protocol version: %r", line)
2270
 
            try:
2271
 
                if int(line.strip().split()[0]) > 1:
2272
 
                    raise RuntimeError(line)
2273
 
            except (ValueError, IndexError, RuntimeError) as error:
2274
 
                logger.error("Unknown protocol version: %s", error)
2275
 
                return
2276
 
 
2277
 
            # Start GnuTLS connection
2278
 
            try:
2279
 
                session.handshake()
2280
 
            except gnutls.Error as error:
2281
 
                logger.warning("Handshake failed: %s", error)
2282
 
                # Do not run session.bye() here: the session is not
2283
 
                # established.  Just abandon the request.
2284
 
                return
2285
 
            logger.debug("Handshake succeeded")
2286
 
 
2287
 
            approval_required = False
2288
 
            try:
2289
 
                if gnutls.has_rawpk:
2290
 
                    fpr = b""
2291
 
                    try:
2292
 
                        key_id = self.key_id(
2293
 
                            self.peer_certificate(session))
2294
 
                    except (TypeError, gnutls.Error) as error:
2295
 
                        logger.warning("Bad certificate: %s", error)
2296
 
                        return
2297
 
                    logger.debug("Key ID: %s", key_id)
2298
 
 
 
301
        if debug:
 
302
            sys.stderr.write(u"TCP request came\n")
 
303
            sys.stderr.write(u"Request: %s\n" % self.request)
 
304
            sys.stderr.write(u"Client Address: %s\n"
 
305
                             % unicode(self.client_address))
 
306
            sys.stderr.write(u"Server: %s\n" % self.server)
 
307
        session = gnutls.connection.ClientSession(self.request,
 
308
                                                  gnutls.connection.\
 
309
                                                  X509Credentials())
 
310
        
 
311
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
312
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
313
        #                "+DHE-DSS"))
 
314
        priority = "SECURE256"
 
315
        
 
316
        gnutls.library.functions.gnutls_priority_set_direct\
 
317
            (session._c_object, priority, None);
 
318
        
 
319
        try:
 
320
            session.handshake()
 
321
        except gnutls.errors.GNUTLSError, error:
 
322
            if debug:
 
323
                sys.stderr.write(u"Handshake failed: %s\n" % error)
 
324
            # Do not run session.bye() here: the session is not
 
325
            # established.  Just abandon the request.
 
326
            return
 
327
        try:
 
328
            fpr = fingerprint(peer_certificate(session))
 
329
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
330
            if debug:
 
331
                sys.stderr.write(u"Bad certificate: %s\n" % error)
 
332
            session.bye()
 
333
            return
 
334
        if debug:
 
335
            sys.stderr.write(u"Fingerprint: %s\n" % fpr)
 
336
        client = None
 
337
        for c in clients:
 
338
            if c.fingerprint == fpr:
 
339
                client = c
 
340
                break
 
341
        # Have to check if client.still_valid(), since it is possible
 
342
        # that the client timed out while establishing the GnuTLS
 
343
        # session.
 
344
        if (not client) or (not client.still_valid()):
 
345
            if debug:
 
346
                if client:
 
347
                    sys.stderr.write(u"Client %(name)s is invalid\n"
 
348
                                     % vars(client))
2299
349
                else:
2300
 
                    key_id = b""
2301
 
                    try:
2302
 
                        fpr = self.fingerprint(
2303
 
                            self.peer_certificate(session))
2304
 
                    except (TypeError, gnutls.Error) as error:
2305
 
                        logger.warning("Bad certificate: %s", error)
2306
 
                        return
2307
 
                    logger.debug("Fingerprint: %s", fpr)
2308
 
 
2309
 
                try:
2310
 
                    client = ProxyClient(child_pipe, key_id, fpr,
2311
 
                                         self.client_address)
2312
 
                except KeyError:
2313
 
                    return
2314
 
 
2315
 
                if client.approval_delay:
2316
 
                    delay = client.approval_delay
2317
 
                    client.approvals_pending += 1
2318
 
                    approval_required = True
2319
 
 
2320
 
                while True:
2321
 
                    if not client.enabled:
2322
 
                        logger.info("Client %s is disabled",
2323
 
                                    client.name)
2324
 
                        if self.server.use_dbus:
2325
 
                            # Emit D-Bus signal
2326
 
                            client.Rejected("Disabled")
2327
 
                        return
2328
 
 
2329
 
                    if client.approved or not client.approval_delay:
2330
 
                        # We are approved or approval is disabled
2331
 
                        break
2332
 
                    elif client.approved is None:
2333
 
                        logger.info("Client %s needs approval",
2334
 
                                    client.name)
2335
 
                        if self.server.use_dbus:
2336
 
                            # Emit D-Bus signal
2337
 
                            client.NeedApproval(
2338
 
                                client.approval_delay.total_seconds()
2339
 
                                * 1000, client.approved_by_default)
2340
 
                    else:
2341
 
                        logger.warning("Client %s was not approved",
2342
 
                                       client.name)
2343
 
                        if self.server.use_dbus:
2344
 
                            # Emit D-Bus signal
2345
 
                            client.Rejected("Denied")
2346
 
                        return
2347
 
 
2348
 
                    # wait until timeout or approved
2349
 
                    time = datetime.datetime.now()
2350
 
                    client.changedstate.acquire()
2351
 
                    client.changedstate.wait(delay.total_seconds())
2352
 
                    client.changedstate.release()
2353
 
                    time2 = datetime.datetime.now()
2354
 
                    if (time2 - time) >= delay:
2355
 
                        if not client.approved_by_default:
2356
 
                            logger.warning("Client %s timed out while"
2357
 
                                           " waiting for approval",
2358
 
                                           client.name)
2359
 
                            if self.server.use_dbus:
2360
 
                                # Emit D-Bus signal
2361
 
                                client.Rejected("Approval timed out")
2362
 
                            return
2363
 
                        else:
2364
 
                            break
2365
 
                    else:
2366
 
                        delay -= time2 - time
2367
 
 
2368
 
                try:
2369
 
                    session.send(client.secret)
2370
 
                except gnutls.Error as error:
2371
 
                    logger.warning("gnutls send failed",
2372
 
                                   exc_info=error)
2373
 
                    return
2374
 
 
2375
 
                logger.info("Sending secret to %s", client.name)
2376
 
                # bump the timeout using extended_timeout
2377
 
                client.bump_timeout(client.extended_timeout)
2378
 
                if self.server.use_dbus:
2379
 
                    # Emit D-Bus signal
2380
 
                    client.GotSecret()
2381
 
 
2382
 
            finally:
2383
 
                if approval_required:
2384
 
                    client.approvals_pending -= 1
2385
 
                try:
2386
 
                    session.bye()
2387
 
                except gnutls.Error as error:
2388
 
                    logger.warning("GnuTLS bye failed",
2389
 
                                   exc_info=error)
2390
 
 
2391
 
    @staticmethod
2392
 
    def peer_certificate(session):
2393
 
        "Return the peer's certificate as a bytestring"
2394
 
        try:
2395
 
            cert_type = gnutls.certificate_type_get2(session._c_object,
2396
 
                                                     gnutls.CTYPE_PEERS)
2397
 
        except AttributeError:
2398
 
            cert_type = gnutls.certificate_type_get(session._c_object)
2399
 
        if gnutls.has_rawpk:
2400
 
            valid_cert_types = frozenset((gnutls.CRT_RAWPK,))
2401
 
        else:
2402
 
            valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))
2403
 
        # If not a valid certificate type...
2404
 
        if cert_type not in valid_cert_types:
2405
 
            logger.info("Cert type %r not in %r", cert_type,
2406
 
                        valid_cert_types)
2407
 
            # ...return invalid data
2408
 
            return b""
2409
 
        list_size = ctypes.c_uint(1)
2410
 
        cert_list = (gnutls.certificate_get_peers
2411
 
                     (session._c_object, ctypes.byref(list_size)))
2412
 
        if not bool(cert_list) and list_size.value != 0:
2413
 
            raise gnutls.Error("error getting peer certificate")
2414
 
        if list_size.value == 0:
2415
 
            return None
2416
 
        cert = cert_list[0]
2417
 
        return ctypes.string_at(cert.data, cert.size)
2418
 
 
2419
 
    @staticmethod
2420
 
    def key_id(certificate):
2421
 
        "Convert a certificate bytestring to a hexdigit key ID"
2422
 
        # New GnuTLS "datum" with the public key
2423
 
        datum = gnutls.datum_t(
2424
 
            ctypes.cast(ctypes.c_char_p(certificate),
2425
 
                        ctypes.POINTER(ctypes.c_ubyte)),
2426
 
            ctypes.c_uint(len(certificate)))
2427
 
        # XXX all these need to be created in the gnutls "module"
2428
 
        # New empty GnuTLS certificate
2429
 
        pubkey = gnutls.pubkey_t()
2430
 
        gnutls.pubkey_init(ctypes.byref(pubkey))
2431
 
        # Import the raw public key into the certificate
2432
 
        gnutls.pubkey_import(pubkey,
2433
 
                             ctypes.byref(datum),
2434
 
                             gnutls.X509_FMT_DER)
2435
 
        # New buffer for the key ID
2436
 
        buf = ctypes.create_string_buffer(32)
2437
 
        buf_len = ctypes.c_size_t(len(buf))
2438
 
        # Get the key ID from the raw public key into the buffer
2439
 
        gnutls.pubkey_get_key_id(pubkey,
2440
 
                                 gnutls.KEYID_USE_SHA256,
2441
 
                                 ctypes.cast(ctypes.byref(buf),
2442
 
                                             ctypes.POINTER(ctypes.c_ubyte)),
2443
 
                                 ctypes.byref(buf_len))
2444
 
        # Deinit the certificate
2445
 
        gnutls.pubkey_deinit(pubkey)
2446
 
 
2447
 
        # Convert the buffer to a Python bytestring
2448
 
        key_id = ctypes.string_at(buf, buf_len.value)
2449
 
        # Convert the bytestring to hexadecimal notation
2450
 
        hex_key_id = binascii.hexlify(key_id).upper()
2451
 
        return hex_key_id
2452
 
 
2453
 
    @staticmethod
2454
 
    def fingerprint(openpgp):
2455
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
2456
 
        # New GnuTLS "datum" with the OpenPGP public key
2457
 
        datum = gnutls.datum_t(
2458
 
            ctypes.cast(ctypes.c_char_p(openpgp),
2459
 
                        ctypes.POINTER(ctypes.c_ubyte)),
2460
 
            ctypes.c_uint(len(openpgp)))
2461
 
        # New empty GnuTLS certificate
2462
 
        crt = gnutls.openpgp_crt_t()
2463
 
        gnutls.openpgp_crt_init(ctypes.byref(crt))
2464
 
        # Import the OpenPGP public key into the certificate
2465
 
        gnutls.openpgp_crt_import(crt, ctypes.byref(datum),
2466
 
                                  gnutls.OPENPGP_FMT_RAW)
2467
 
        # Verify the self signature in the key
2468
 
        crtverify = ctypes.c_uint()
2469
 
        gnutls.openpgp_crt_verify_self(crt, 0,
2470
 
                                       ctypes.byref(crtverify))
2471
 
        if crtverify.value != 0:
2472
 
            gnutls.openpgp_crt_deinit(crt)
2473
 
            raise gnutls.CertificateSecurityError(code
2474
 
                                                  =crtverify.value)
2475
 
        # New buffer for the fingerprint
2476
 
        buf = ctypes.create_string_buffer(20)
2477
 
        buf_len = ctypes.c_size_t()
2478
 
        # Get the fingerprint from the certificate into the buffer
2479
 
        gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
2480
 
                                           ctypes.byref(buf_len))
2481
 
        # Deinit the certificate
2482
 
        gnutls.openpgp_crt_deinit(crt)
2483
 
        # Convert the buffer to a Python bytestring
2484
 
        fpr = ctypes.string_at(buf, buf_len.value)
2485
 
        # Convert the bytestring to hexadecimal notation
2486
 
        hex_fpr = binascii.hexlify(fpr).upper()
2487
 
        return hex_fpr
2488
 
 
2489
 
 
2490
 
class MultiprocessingMixIn(object):
2491
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
2492
 
 
2493
 
    def sub_process_main(self, request, address):
2494
 
        try:
2495
 
            self.finish_request(request, address)
2496
 
        except Exception:
2497
 
            self.handle_error(request, address)
2498
 
        self.close_request(request)
2499
 
 
2500
 
    def process_request(self, request, address):
2501
 
        """Start a new process to process the request."""
2502
 
        proc = multiprocessing.Process(target=self.sub_process_main,
2503
 
                                       args=(request, address))
2504
 
        proc.start()
2505
 
        return proc
2506
 
 
2507
 
 
2508
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
2509
 
    """ adds a pipe to the MixIn """
2510
 
 
2511
 
    def process_request(self, request, client_address):
2512
 
        """Overrides and wraps the original process_request().
2513
 
 
2514
 
        This function creates a new pipe in self.pipe
2515
 
        """
2516
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
2517
 
 
2518
 
        proc = MultiprocessingMixIn.process_request(self, request,
2519
 
                                                    client_address)
2520
 
        self.child_pipe.close()
2521
 
        self.add_pipe(parent_pipe, proc)
2522
 
 
2523
 
    def add_pipe(self, parent_pipe, proc):
2524
 
        """Dummy function; override as necessary"""
2525
 
        raise NotImplementedError()
2526
 
 
2527
 
 
2528
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
2529
 
                     socketserver.TCPServer, object):
2530
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
2531
 
 
 
350
                    sys.stderr.write(u"Client not found for "
 
351
                                     u"fingerprint: %s\n" % fpr)
 
352
            session.bye()
 
353
            return
 
354
        sent_size = 0
 
355
        while sent_size < len(client.secret):
 
356
            sent = session.send(client.secret[sent_size:])
 
357
            if debug:
 
358
                sys.stderr.write(u"Sent: %d, remaining: %d\n"
 
359
                                 % (sent, len(client.secret)
 
360
                                    - (sent_size + sent)))
 
361
            sent_size += sent
 
362
        session.bye()
 
363
 
 
364
 
 
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
366
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
2532
367
    Attributes:
2533
 
        enabled:        Boolean; whether this server is activated yet
2534
 
        interface:      None or a network interface name (string)
2535
 
        use_ipv6:       Boolean; to use IPv6 or not
 
368
        options:        Command line options
 
369
        clients:        Set() of Client objects
2536
370
    """
2537
 
 
2538
 
    def __init__(self, server_address, RequestHandlerClass,
2539
 
                 interface=None,
2540
 
                 use_ipv6=True,
2541
 
                 socketfd=None):
2542
 
        """If socketfd is set, use that file descriptor instead of
2543
 
        creating a new one with socket.socket().
2544
 
        """
2545
 
        self.interface = interface
2546
 
        if use_ipv6:
2547
 
            self.address_family = socket.AF_INET6
2548
 
        if socketfd is not None:
2549
 
            # Save the file descriptor
2550
 
            self.socketfd = socketfd
2551
 
            # Save the original socket.socket() function
2552
 
            self.socket_socket = socket.socket
2553
 
 
2554
 
            # To implement --socket, we monkey patch socket.socket.
2555
 
            #
2556
 
            # (When socketserver.TCPServer is a new-style class, we
2557
 
            # could make self.socket into a property instead of monkey
2558
 
            # patching socket.socket.)
2559
 
            #
2560
 
            # Create a one-time-only replacement for socket.socket()
2561
 
            @functools.wraps(socket.socket)
2562
 
            def socket_wrapper(*args, **kwargs):
2563
 
                # Restore original function so subsequent calls are
2564
 
                # not affected.
2565
 
                socket.socket = self.socket_socket
2566
 
                del self.socket_socket
2567
 
                # This time only, return a new socket object from the
2568
 
                # saved file descriptor.
2569
 
                return socket.fromfd(self.socketfd, *args, **kwargs)
2570
 
            # Replace socket.socket() function with wrapper
2571
 
            socket.socket = socket_wrapper
2572
 
        # The socketserver.TCPServer.__init__ will call
2573
 
        # socket.socket(), which might be our replacement,
2574
 
        # socket_wrapper(), if socketfd was set.
2575
 
        socketserver.TCPServer.__init__(self, server_address,
2576
 
                                        RequestHandlerClass)
2577
 
 
 
371
    address_family = socket.AF_INET6
 
372
    def __init__(self, *args, **kwargs):
 
373
        if "options" in kwargs:
 
374
            self.options = kwargs["options"]
 
375
            del kwargs["options"]
 
376
        if "clients" in kwargs:
 
377
            self.clients = kwargs["clients"]
 
378
            del kwargs["clients"]
 
379
        return super(type(self), self).__init__(*args, **kwargs)
2578
380
    def server_bind(self):
2579
381
        """This overrides the normal server_bind() function
2580
382
        to bind to an interface if one was specified, and also NOT to
2581
383
        bind to an address or port if they were not specified."""
2582
 
        global SO_BINDTODEVICE
2583
 
        if self.interface is not None:
2584
 
            if SO_BINDTODEVICE is None:
2585
 
                # Fall back to a hard-coded value which seems to be
2586
 
                # common enough.
2587
 
                logger.warning("SO_BINDTODEVICE not found, trying 25")
2588
 
                SO_BINDTODEVICE = 25
 
384
        if self.options.interface:
 
385
            if not hasattr(socket, "SO_BINDTODEVICE"):
 
386
                # From /usr/include/asm-i486/socket.h
 
387
                socket.SO_BINDTODEVICE = 25
2589
388
            try:
2590
 
                self.socket.setsockopt(
2591
 
                    socket.SOL_SOCKET, SO_BINDTODEVICE,
2592
 
                    (self.interface + "\0").encode("utf-8"))
2593
 
            except socket.error as error:
2594
 
                if error.errno == errno.EPERM:
2595
 
                    logger.error("No permission to bind to"
2596
 
                                 " interface %s", self.interface)
2597
 
                elif error.errno == errno.ENOPROTOOPT:
2598
 
                    logger.error("SO_BINDTODEVICE not available;"
2599
 
                                 " cannot bind to interface %s",
2600
 
                                 self.interface)
2601
 
                elif error.errno == errno.ENODEV:
2602
 
                    logger.error("Interface %s does not exist,"
2603
 
                                 " cannot bind", self.interface)
 
389
                self.socket.setsockopt(socket.SOL_SOCKET,
 
390
                                       socket.SO_BINDTODEVICE,
 
391
                                       self.options.interface)
 
392
            except socket.error, error:
 
393
                if error[0] == errno.EPERM:
 
394
                    sys.stderr.write(u"Warning: No permission to" \
 
395
                                     u" bind to interface %s\n"
 
396
                                     % self.options.interface)
2604
397
                else:
2605
 
                    raise
 
398
                    raise error
2606
399
        # Only bind(2) the socket if we really need to.
2607
400
        if self.server_address[0] or self.server_address[1]:
2608
 
            if self.server_address[1]:
2609
 
                self.allow_reuse_address = True
2610
401
            if not self.server_address[0]:
2611
 
                if self.address_family == socket.AF_INET6:
2612
 
                    any_address = "::"  # in6addr_any
2613
 
                else:
2614
 
                    any_address = "0.0.0.0"  # INADDR_ANY
2615
 
                self.server_address = (any_address,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
2616
404
                                       self.server_address[1])
2617
 
            elif not self.server_address[1]:
2618
 
                self.server_address = (self.server_address[0], 0)
2619
 
#                 if self.interface:
2620
 
#                     self.server_address = (self.server_address[0],
2621
 
#                                            0, # port
2622
 
#                                            0, # flowinfo
2623
 
#                                            if_nametoindex
2624
 
#                                            (self.interface))
2625
 
            return socketserver.TCPServer.server_bind(self)
2626
 
 
2627
 
 
2628
 
class MandosServer(IPv6_TCPServer):
2629
 
    """Mandos server.
2630
 
 
2631
 
    Attributes:
2632
 
        clients:        set of Client objects
2633
 
        gnutls_priority GnuTLS priority string
2634
 
        use_dbus:       Boolean; to emit D-Bus signals or not
2635
 
 
2636
 
    Assumes a GLib.MainLoop event loop.
2637
 
    """
2638
 
 
2639
 
    def __init__(self, server_address, RequestHandlerClass,
2640
 
                 interface=None,
2641
 
                 use_ipv6=True,
2642
 
                 clients=None,
2643
 
                 gnutls_priority=None,
2644
 
                 use_dbus=True,
2645
 
                 socketfd=None):
2646
 
        self.enabled = False
2647
 
        self.clients = clients
2648
 
        if self.clients is None:
2649
 
            self.clients = {}
2650
 
        self.use_dbus = use_dbus
2651
 
        self.gnutls_priority = gnutls_priority
2652
 
        IPv6_TCPServer.__init__(self, server_address,
2653
 
                                RequestHandlerClass,
2654
 
                                interface=interface,
2655
 
                                use_ipv6=use_ipv6,
2656
 
                                socketfd=socketfd)
2657
 
 
2658
 
    def server_activate(self):
2659
 
        if self.enabled:
2660
 
            return socketserver.TCPServer.server_activate(self)
2661
 
 
2662
 
    def enable(self):
2663
 
        self.enabled = True
2664
 
 
2665
 
    def add_pipe(self, parent_pipe, proc):
2666
 
        # Call "handle_ipc" for both data and EOF events
2667
 
        GLib.io_add_watch(
2668
 
            parent_pipe.fileno(),
2669
 
            GLib.IO_IN | GLib.IO_HUP,
2670
 
            functools.partial(self.handle_ipc,
2671
 
                              parent_pipe=parent_pipe,
2672
 
                              proc=proc))
2673
 
 
2674
 
    def handle_ipc(self, source, condition,
2675
 
                   parent_pipe=None,
2676
 
                   proc=None,
2677
 
                   client_object=None):
2678
 
        # error, or the other end of multiprocessing.Pipe has closed
2679
 
        if condition & (GLib.IO_ERR | GLib.IO_HUP):
2680
 
            # Wait for other process to exit
2681
 
            proc.join()
2682
 
            return False
2683
 
 
2684
 
        # Read a request from the child
2685
 
        request = parent_pipe.recv()
2686
 
        command = request[0]
2687
 
 
2688
 
        if command == 'init':
2689
 
            key_id = request[1].decode("ascii")
2690
 
            fpr = request[2].decode("ascii")
2691
 
            address = request[3]
2692
 
 
2693
 
            for c in self.clients.values():
2694
 
                if key_id == "E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855":
2695
 
                    continue
2696
 
                if key_id and c.key_id == key_id:
2697
 
                    client = c
2698
 
                    break
2699
 
                if fpr and c.fingerprint == fpr:
2700
 
                    client = c
2701
 
                    break
2702
 
            else:
2703
 
                logger.info("Client not found for key ID: %s, address"
2704
 
                            ": %s", key_id or fpr, address)
2705
 
                if self.use_dbus:
2706
 
                    # Emit D-Bus signal
2707
 
                    mandos_dbus_service.ClientNotFound(key_id or fpr,
2708
 
                                                       address[0])
2709
 
                parent_pipe.send(False)
2710
 
                return False
2711
 
 
2712
 
            GLib.io_add_watch(
2713
 
                parent_pipe.fileno(),
2714
 
                GLib.IO_IN | GLib.IO_HUP,
2715
 
                functools.partial(self.handle_ipc,
2716
 
                                  parent_pipe=parent_pipe,
2717
 
                                  proc=proc,
2718
 
                                  client_object=client))
2719
 
            parent_pipe.send(True)
2720
 
            # remove the old hook in favor of the new above hook on
2721
 
            # same fileno
2722
 
            return False
2723
 
        if command == 'funcall':
2724
 
            funcname = request[1]
2725
 
            args = request[2]
2726
 
            kwargs = request[3]
2727
 
 
2728
 
            parent_pipe.send(('data', getattr(client_object,
2729
 
                                              funcname)(*args,
2730
 
                                                        **kwargs)))
2731
 
 
2732
 
        if command == 'getattr':
2733
 
            attrname = request[1]
2734
 
            if isinstance(client_object.__getattribute__(attrname),
2735
 
                          collections.Callable):
2736
 
                parent_pipe.send(('function', ))
2737
 
            else:
2738
 
                parent_pipe.send((
2739
 
                    'data', client_object.__getattribute__(attrname)))
2740
 
 
2741
 
        if command == 'setattr':
2742
 
            attrname = request[1]
2743
 
            value = request[2]
2744
 
            setattr(client_object, attrname, value)
2745
 
 
2746
 
        return True
2747
 
 
2748
 
 
2749
 
def rfc3339_duration_to_delta(duration):
2750
 
    """Parse an RFC 3339 "duration" and return a datetime.timedelta
2751
 
 
2752
 
    >>> rfc3339_duration_to_delta("P7D")
2753
 
    datetime.timedelta(7)
2754
 
    >>> rfc3339_duration_to_delta("PT60S")
2755
 
    datetime.timedelta(0, 60)
2756
 
    >>> rfc3339_duration_to_delta("PT60M")
2757
 
    datetime.timedelta(0, 3600)
2758
 
    >>> rfc3339_duration_to_delta("PT24H")
2759
 
    datetime.timedelta(1)
2760
 
    >>> rfc3339_duration_to_delta("P1W")
2761
 
    datetime.timedelta(7)
2762
 
    >>> rfc3339_duration_to_delta("PT5M30S")
2763
 
    datetime.timedelta(0, 330)
2764
 
    >>> rfc3339_duration_to_delta("P1DT3M20S")
2765
 
    datetime.timedelta(1, 200)
2766
 
    """
2767
 
 
2768
 
    # Parsing an RFC 3339 duration with regular expressions is not
2769
 
    # possible - there would have to be multiple places for the same
2770
 
    # values, like seconds.  The current code, while more esoteric, is
2771
 
    # cleaner without depending on a parsing library.  If Python had a
2772
 
    # built-in library for parsing we would use it, but we'd like to
2773
 
    # avoid excessive use of external libraries.
2774
 
 
2775
 
    # New type for defining tokens, syntax, and semantics all-in-one
2776
 
    Token = collections.namedtuple("Token", (
2777
 
        "regexp",  # To match token; if "value" is not None, must have
2778
 
                   # a "group" containing digits
2779
 
        "value",   # datetime.timedelta or None
2780
 
        "followers"))           # Tokens valid after this token
2781
 
    # RFC 3339 "duration" tokens, syntax, and semantics; taken from
2782
 
    # the "duration" ABNF definition in RFC 3339, Appendix A.
2783
 
    token_end = Token(re.compile(r"$"), None, frozenset())
2784
 
    token_second = Token(re.compile(r"(\d+)S"),
2785
 
                         datetime.timedelta(seconds=1),
2786
 
                         frozenset((token_end, )))
2787
 
    token_minute = Token(re.compile(r"(\d+)M"),
2788
 
                         datetime.timedelta(minutes=1),
2789
 
                         frozenset((token_second, token_end)))
2790
 
    token_hour = Token(re.compile(r"(\d+)H"),
2791
 
                       datetime.timedelta(hours=1),
2792
 
                       frozenset((token_minute, token_end)))
2793
 
    token_time = Token(re.compile(r"T"),
2794
 
                       None,
2795
 
                       frozenset((token_hour, token_minute,
2796
 
                                  token_second)))
2797
 
    token_day = Token(re.compile(r"(\d+)D"),
2798
 
                      datetime.timedelta(days=1),
2799
 
                      frozenset((token_time, token_end)))
2800
 
    token_month = Token(re.compile(r"(\d+)M"),
2801
 
                        datetime.timedelta(weeks=4),
2802
 
                        frozenset((token_day, token_end)))
2803
 
    token_year = Token(re.compile(r"(\d+)Y"),
2804
 
                       datetime.timedelta(weeks=52),
2805
 
                       frozenset((token_month, token_end)))
2806
 
    token_week = Token(re.compile(r"(\d+)W"),
2807
 
                       datetime.timedelta(weeks=1),
2808
 
                       frozenset((token_end, )))
2809
 
    token_duration = Token(re.compile(r"P"), None,
2810
 
                           frozenset((token_year, token_month,
2811
 
                                      token_day, token_time,
2812
 
                                      token_week)))
2813
 
    # Define starting values:
2814
 
    # Value so far
2815
 
    value = datetime.timedelta()
2816
 
    found_token = None
2817
 
    # Following valid tokens
2818
 
    followers = frozenset((token_duration, ))
2819
 
    # String left to parse
2820
 
    s = duration
2821
 
    # Loop until end token is found
2822
 
    while found_token is not token_end:
2823
 
        # Search for any currently valid tokens
2824
 
        for token in followers:
2825
 
            match = token.regexp.match(s)
2826
 
            if match is not None:
2827
 
                # Token found
2828
 
                if token.value is not None:
2829
 
                    # Value found, parse digits
2830
 
                    factor = int(match.group(1), 10)
2831
 
                    # Add to value so far
2832
 
                    value += factor * token.value
2833
 
                # Strip token from string
2834
 
                s = token.regexp.sub("", s, 1)
2835
 
                # Go to found token
2836
 
                found_token = token
2837
 
                # Set valid next tokens
2838
 
                followers = found_token.followers
2839
 
                break
2840
 
        else:
2841
 
            # No currently valid tokens were found
2842
 
            raise ValueError("Invalid RFC 3339 duration: {!r}"
2843
 
                             .format(duration))
2844
 
    # End token found
2845
 
    return value
 
405
            elif self.server_address[1] is None:
 
406
                self.server_address = (self.server_address[0],
 
407
                                       0)
 
408
            return super(type(self), self).server_bind()
2846
409
 
2847
410
 
2848
411
def string_to_delta(interval):
2856
419
    datetime.timedelta(0, 3600)
2857
420
    >>> string_to_delta('24h')
2858
421
    datetime.timedelta(1)
2859
 
    >>> string_to_delta('1w')
 
422
    >>> string_to_delta(u'1w')
2860
423
    datetime.timedelta(7)
2861
 
    >>> string_to_delta('5m 30s')
2862
 
    datetime.timedelta(0, 330)
2863
424
    """
2864
 
 
2865
 
    try:
2866
 
        return rfc3339_duration_to_delta(interval)
2867
 
    except ValueError:
2868
 
        pass
2869
 
 
2870
 
    timevalue = datetime.timedelta(0)
2871
 
    for s in interval.split():
2872
 
        try:
2873
 
            suffix = s[-1]
2874
 
            value = int(s[:-1])
2875
 
            if suffix == "d":
2876
 
                delta = datetime.timedelta(value)
2877
 
            elif suffix == "s":
2878
 
                delta = datetime.timedelta(0, value)
2879
 
            elif suffix == "m":
2880
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
2881
 
            elif suffix == "h":
2882
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
2883
 
            elif suffix == "w":
2884
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
2885
 
            else:
2886
 
                raise ValueError("Unknown suffix {!r}".format(suffix))
2887
 
        except IndexError as e:
2888
 
            raise ValueError(*(e.args))
2889
 
        timevalue += delta
2890
 
    return timevalue
2891
 
 
2892
 
 
2893
 
def daemon(nochdir=False, noclose=False):
2894
 
    """See daemon(3).  Standard BSD Unix function.
2895
 
 
2896
 
    This should really exist as os.daemon, but it doesn't (yet)."""
2897
 
    if os.fork():
2898
 
        sys.exit()
2899
 
    os.setsid()
2900
 
    if not nochdir:
2901
 
        os.chdir("/")
2902
 
    if os.fork():
2903
 
        sys.exit()
2904
 
    if not noclose:
2905
 
        # Close all standard open file descriptors
2906
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
2907
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
2908
 
            raise OSError(errno.ENODEV,
2909
 
                          "{} not a character device"
2910
 
                          .format(os.devnull))
2911
 
        os.dup2(null, sys.stdin.fileno())
2912
 
        os.dup2(null, sys.stdout.fileno())
2913
 
        os.dup2(null, sys.stderr.fileno())
2914
 
        if null > 2:
2915
 
            os.close(null)
2916
 
 
2917
 
 
2918
 
def main():
2919
 
 
2920
 
    ##################################################################
2921
 
    # Parsing of options, both command line and config file
2922
 
 
2923
 
    parser = argparse.ArgumentParser()
2924
 
    parser.add_argument("-v", "--version", action="version",
2925
 
                        version="%(prog)s {}".format(version),
2926
 
                        help="show version number and exit")
2927
 
    parser.add_argument("-i", "--interface", metavar="IF",
2928
 
                        help="Bind to interface IF")
2929
 
    parser.add_argument("-a", "--address",
2930
 
                        help="Address to listen for requests on")
2931
 
    parser.add_argument("-p", "--port", type=int,
2932
 
                        help="Port number to receive requests on")
2933
 
    parser.add_argument("--check", action="store_true",
2934
 
                        help="Run self-test")
2935
 
    parser.add_argument("--debug", action="store_true",
2936
 
                        help="Debug mode; run in foreground and log"
2937
 
                        " to terminal", default=None)
2938
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
2939
 
                        help="Debug level for stdout output")
2940
 
    parser.add_argument("--priority", help="GnuTLS"
2941
 
                        " priority string (see GnuTLS documentation)")
2942
 
    parser.add_argument("--servicename",
2943
 
                        metavar="NAME", help="Zeroconf service name")
2944
 
    parser.add_argument("--configdir",
2945
 
                        default="/etc/mandos", metavar="DIR",
2946
 
                        help="Directory to search for configuration"
2947
 
                        " files")
2948
 
    parser.add_argument("--no-dbus", action="store_false",
2949
 
                        dest="use_dbus", help="Do not provide D-Bus"
2950
 
                        " system bus interface", default=None)
2951
 
    parser.add_argument("--no-ipv6", action="store_false",
2952
 
                        dest="use_ipv6", help="Do not use IPv6",
2953
 
                        default=None)
2954
 
    parser.add_argument("--no-restore", action="store_false",
2955
 
                        dest="restore", help="Do not restore stored"
2956
 
                        " state", default=None)
2957
 
    parser.add_argument("--socket", type=int,
2958
 
                        help="Specify a file descriptor to a network"
2959
 
                        " socket to use instead of creating one")
2960
 
    parser.add_argument("--statedir", metavar="DIR",
2961
 
                        help="Directory to save/restore state in")
2962
 
    parser.add_argument("--foreground", action="store_true",
2963
 
                        help="Run in foreground", default=None)
2964
 
    parser.add_argument("--no-zeroconf", action="store_false",
2965
 
                        dest="zeroconf", help="Do not use Zeroconf",
2966
 
                        default=None)
2967
 
 
2968
 
    options = parser.parse_args()
2969
 
 
 
425
    try:
 
426
        suffix=unicode(interval[-1])
 
427
        value=int(interval[:-1])
 
428
        if suffix == u"d":
 
429
            delta = datetime.timedelta(value)
 
430
        elif suffix == u"s":
 
431
            delta = datetime.timedelta(0, value)
 
432
        elif suffix == u"m":
 
433
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
434
        elif suffix == u"h":
 
435
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
436
        elif suffix == u"w":
 
437
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
438
        else:
 
439
            raise ValueError
 
440
    except (ValueError, IndexError):
 
441
        raise ValueError
 
442
    return delta
 
443
 
 
444
 
 
445
def add_service():
 
446
    """From the Avahi server example code"""
 
447
    global group, serviceName, serviceType, servicePort, serviceTXT, \
 
448
           domain, host
 
449
    if group is None:
 
450
        group = dbus.Interface(
 
451
                bus.get_object( avahi.DBUS_NAME,
 
452
                                server.EntryGroupNew()),
 
453
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
454
        group.connect_to_signal('StateChanged',
 
455
                                entry_group_state_changed)
 
456
    if debug:
 
457
        sys.stderr.write(u"Adding service '%s' of type '%s' ...\n"
 
458
                         % (serviceName, serviceType))
 
459
    
 
460
    group.AddService(
 
461
            serviceInterface,           # interface
 
462
            avahi.PROTO_INET6,          # protocol
 
463
            dbus.UInt32(0),             # flags
 
464
            serviceName, serviceType,
 
465
            domain, host,
 
466
            dbus.UInt16(servicePort),
 
467
            avahi.string_array_to_txt_array(serviceTXT))
 
468
    group.Commit()
 
469
 
 
470
 
 
471
def remove_service():
 
472
    """From the Avahi server example code"""
 
473
    global group
 
474
    
 
475
    if not group is None:
 
476
        group.Reset()
 
477
 
 
478
 
 
479
def server_state_changed(state):
 
480
    """From the Avahi server example code"""
 
481
    if state == avahi.SERVER_COLLISION:
 
482
        sys.stderr.write(u"WARNING: Server name collision\n")
 
483
        remove_service()
 
484
    elif state == avahi.SERVER_RUNNING:
 
485
        add_service()
 
486
 
 
487
 
 
488
def entry_group_state_changed(state, error):
 
489
    """From the Avahi server example code"""
 
490
    global serviceName, server, rename_count
 
491
    
 
492
    if debug:
 
493
        sys.stderr.write(u"state change: %i\n" % state)
 
494
    
 
495
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
496
        if debug:
 
497
            sys.stderr.write(u"Service established.\n")
 
498
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
499
        
 
500
        rename_count = rename_count - 1
 
501
        if rename_count > 0:
 
502
            name = server.GetAlternativeServiceName(name)
 
503
            sys.stderr.write(u"WARNING: Service name collision, "
 
504
                             u"changing name to '%s' ...\n" % name)
 
505
            remove_service()
 
506
            add_service()
 
507
            
 
508
        else:
 
509
            sys.stderr.write(u"ERROR: No suitable service name found "
 
510
                             u"after %i retries, exiting.\n"
 
511
                             % n_rename)
 
512
            main_loop.quit()
 
513
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
514
        sys.stderr.write(u"Error in group state changed %s\n"
 
515
                         % unicode(error))
 
516
        main_loop.quit()
 
517
        return
 
518
 
 
519
 
 
520
def if_nametoindex(interface):
 
521
    """Call the C function if_nametoindex()"""
 
522
    try:
 
523
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
524
        return libc.if_nametoindex(interface)
 
525
    except (OSError, AttributeError):
 
526
        if "struct" not in sys.modules:
 
527
            import struct
 
528
        if "fcntl" not in sys.modules:
 
529
            import fcntl
 
530
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
531
        s = socket.socket()
 
532
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
533
                            struct.pack("16s16x", interface))
 
534
        s.close()
 
535
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
536
        return interface_index
 
537
 
 
538
 
 
539
if __name__ == '__main__':
 
540
    parser = OptionParser()
 
541
    parser.add_option("-i", "--interface", type="string",
 
542
                      default=None, metavar="IF",
 
543
                      help="Bind to interface IF")
 
544
    parser.add_option("--cert", type="string", default="cert.pem",
 
545
                      metavar="FILE",
 
546
                      help="Public key certificate PEM file to use")
 
547
    parser.add_option("--key", type="string", default="key.pem",
 
548
                      metavar="FILE",
 
549
                      help="Private key PEM file to use")
 
550
    parser.add_option("--ca", type="string", default="ca.pem",
 
551
                      metavar="FILE",
 
552
                      help="Certificate Authority certificate PEM file to use")
 
553
    parser.add_option("--crl", type="string", default="crl.pem",
 
554
                      metavar="FILE",
 
555
                      help="Certificate Revokation List PEM file to use")
 
556
    parser.add_option("-p", "--port", type="int", default=None,
 
557
                      help="Port number to receive requests on")
 
558
    parser.add_option("--timeout", type="string", # Parsed later
 
559
                      default="1h",
 
560
                      help="Amount of downtime allowed for clients")
 
561
    parser.add_option("--interval", type="string", # Parsed later
 
562
                      default="5m",
 
563
                      help="How often to check that a client is up")
 
564
    parser.add_option("--check", action="store_true", default=False,
 
565
                      help="Run self-test")
 
566
    parser.add_option("--debug", action="store_true", default=False,
 
567
                      help="Debug mode")
 
568
    (options, args) = parser.parse_args()
 
569
    
2970
570
    if options.check:
2971
571
        import doctest
2972
 
        fail_count, test_count = doctest.testmod()
2973
 
        sys.exit(os.EX_OK if fail_count == 0 else 1)
2974
 
 
2975
 
    # Default values for config file for server-global settings
2976
 
    if gnutls.has_rawpk:
2977
 
        priority = ("SECURE128:!CTYPE-X.509:+CTYPE-RAWPK:!RSA"
2978
 
                    ":!VERS-ALL:+VERS-TLS1.3:%PROFILE_ULTRA")
2979
 
    else:
2980
 
        priority = ("SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"
2981
 
                    ":+SIGN-DSA-SHA256")
2982
 
    server_defaults = {"interface": "",
2983
 
                       "address": "",
2984
 
                       "port": "",
2985
 
                       "debug": "False",
2986
 
                       "priority": priority,
2987
 
                       "servicename": "Mandos",
2988
 
                       "use_dbus": "True",
2989
 
                       "use_ipv6": "True",
2990
 
                       "debuglevel": "",
2991
 
                       "restore": "True",
2992
 
                       "socket": "",
2993
 
                       "statedir": "/var/lib/mandos",
2994
 
                       "foreground": "False",
2995
 
                       "zeroconf": "True",
2996
 
                       }
2997
 
    del priority
2998
 
 
2999
 
    # Parse config file for server-global settings
3000
 
    server_config = configparser.SafeConfigParser(server_defaults)
3001
 
    del server_defaults
3002
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
3003
 
    # Convert the SafeConfigParser object to a dict
3004
 
    server_settings = server_config.defaults()
3005
 
    # Use the appropriate methods on the non-string config options
3006
 
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
3007
 
                   "foreground", "zeroconf"):
3008
 
        server_settings[option] = server_config.getboolean("DEFAULT",
3009
 
                                                           option)
3010
 
    if server_settings["port"]:
3011
 
        server_settings["port"] = server_config.getint("DEFAULT",
3012
 
                                                       "port")
3013
 
    if server_settings["socket"]:
3014
 
        server_settings["socket"] = server_config.getint("DEFAULT",
3015
 
                                                         "socket")
3016
 
        # Later, stdin will, and stdout and stderr might, be dup'ed
3017
 
        # over with an opened os.devnull.  But we don't want this to
3018
 
        # happen with a supplied network socket.
3019
 
        if 0 <= server_settings["socket"] <= 2:
3020
 
            server_settings["socket"] = os.dup(server_settings
3021
 
                                               ["socket"])
3022
 
    del server_config
3023
 
 
3024
 
    # Override the settings from the config file with command line
3025
 
    # options, if set.
3026
 
    for option in ("interface", "address", "port", "debug",
3027
 
                   "priority", "servicename", "configdir", "use_dbus",
3028
 
                   "use_ipv6", "debuglevel", "restore", "statedir",
3029
 
                   "socket", "foreground", "zeroconf"):
3030
 
        value = getattr(options, option)
3031
 
        if value is not None:
3032
 
            server_settings[option] = value
3033
 
    del options
3034
 
    # Force all strings to be unicode
3035
 
    for option in server_settings.keys():
3036
 
        if isinstance(server_settings[option], bytes):
3037
 
            server_settings[option] = (server_settings[option]
3038
 
                                       .decode("utf-8"))
3039
 
    # Force all boolean options to be boolean
3040
 
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
3041
 
                   "foreground", "zeroconf"):
3042
 
        server_settings[option] = bool(server_settings[option])
3043
 
    # Debug implies foreground
3044
 
    if server_settings["debug"]:
3045
 
        server_settings["foreground"] = True
3046
 
    # Now we have our good server settings in "server_settings"
3047
 
 
3048
 
    ##################################################################
3049
 
 
3050
 
    if (not server_settings["zeroconf"]
3051
 
        and not (server_settings["port"]
3052
 
                 or server_settings["socket"] != "")):
3053
 
        parser.error("Needs port or socket to work without Zeroconf")
3054
 
 
3055
 
    # For convenience
3056
 
    debug = server_settings["debug"]
3057
 
    debuglevel = server_settings["debuglevel"]
3058
 
    use_dbus = server_settings["use_dbus"]
3059
 
    use_ipv6 = server_settings["use_ipv6"]
3060
 
    stored_state_path = os.path.join(server_settings["statedir"],
3061
 
                                     stored_state_file)
3062
 
    foreground = server_settings["foreground"]
3063
 
    zeroconf = server_settings["zeroconf"]
3064
 
 
3065
 
    if debug:
3066
 
        initlogger(debug, logging.DEBUG)
3067
 
    else:
3068
 
        if not debuglevel:
3069
 
            initlogger(debug)
3070
 
        else:
3071
 
            level = getattr(logging, debuglevel.upper())
3072
 
            initlogger(debug, level)
3073
 
 
3074
 
    if server_settings["servicename"] != "Mandos":
3075
 
        syslogger.setFormatter(
3076
 
            logging.Formatter('Mandos ({}) [%(process)d]:'
3077
 
                              ' %(levelname)s: %(message)s'.format(
3078
 
                                  server_settings["servicename"])))
3079
 
 
3080
 
    # Parse config file with clients
3081
 
    client_config = configparser.SafeConfigParser(Client
3082
 
                                                  .client_defaults)
3083
 
    client_config.read(os.path.join(server_settings["configdir"],
3084
 
                                    "clients.conf"))
3085
 
 
3086
 
    global mandos_dbus_service
3087
 
    mandos_dbus_service = None
3088
 
 
3089
 
    socketfd = None
3090
 
    if server_settings["socket"] != "":
3091
 
        socketfd = server_settings["socket"]
3092
 
    tcp_server = MandosServer(
3093
 
        (server_settings["address"], server_settings["port"]),
3094
 
        ClientHandler,
3095
 
        interface=(server_settings["interface"] or None),
3096
 
        use_ipv6=use_ipv6,
3097
 
        gnutls_priority=server_settings["priority"],
3098
 
        use_dbus=use_dbus,
3099
 
        socketfd=socketfd)
3100
 
    if not foreground:
3101
 
        pidfilename = "/run/mandos.pid"
3102
 
        if not os.path.isdir("/run/."):
3103
 
            pidfilename = "/var/run/mandos.pid"
3104
 
        pidfile = None
3105
 
        try:
3106
 
            pidfile = codecs.open(pidfilename, "w", encoding="utf-8")
3107
 
        except IOError as e:
3108
 
            logger.error("Could not open file %r", pidfilename,
3109
 
                         exc_info=e)
3110
 
 
3111
 
    for name, group in (("_mandos", "_mandos"),
3112
 
                        ("mandos", "mandos"),
3113
 
                        ("nobody", "nogroup")):
3114
 
        try:
3115
 
            uid = pwd.getpwnam(name).pw_uid
3116
 
            gid = pwd.getpwnam(group).pw_gid
3117
 
            break
3118
 
        except KeyError:
3119
 
            continue
3120
 
    else:
3121
 
        uid = 65534
3122
 
        gid = 65534
3123
 
    try:
3124
 
        os.setgid(gid)
3125
 
        os.setuid(uid)
3126
 
        if debug:
3127
 
            logger.debug("Did setuid/setgid to {}:{}".format(uid,
3128
 
                                                             gid))
3129
 
    except OSError as error:
3130
 
        logger.warning("Failed to setuid/setgid to {}:{}: {}"
3131
 
                       .format(uid, gid, os.strerror(error.errno)))
3132
 
        if error.errno != errno.EPERM:
3133
 
            raise
3134
 
 
3135
 
    if debug:
3136
 
        # Enable all possible GnuTLS debugging
3137
 
 
3138
 
        # "Use a log level over 10 to enable all debugging options."
3139
 
        # - GnuTLS manual
3140
 
        gnutls.global_set_log_level(11)
3141
 
 
3142
 
        @gnutls.log_func
3143
 
        def debug_gnutls(level, string):
3144
 
            logger.debug("GnuTLS: %s", string[:-1])
3145
 
 
3146
 
        gnutls.global_set_log_function(debug_gnutls)
3147
 
 
3148
 
        # Redirect stdin so all checkers get /dev/null
3149
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
3150
 
        os.dup2(null, sys.stdin.fileno())
3151
 
        if null > 2:
3152
 
            os.close(null)
3153
 
 
3154
 
    # Need to fork before connecting to D-Bus
3155
 
    if not foreground:
3156
 
        # Close all input and output, do double fork, etc.
3157
 
        daemon()
3158
 
 
3159
 
    # multiprocessing will use threads, so before we use GLib we need
3160
 
    # to inform GLib that threads will be used.
3161
 
    GLib.threads_init()
3162
 
 
3163
 
    global main_loop
3164
 
    # From the Avahi example code
3165
 
    DBusGMainLoop(set_as_default=True)
3166
 
    main_loop = GLib.MainLoop()
 
572
        doctest.testmod()
 
573
        sys.exit()
 
574
    
 
575
    # Parse the time arguments
 
576
    try:
 
577
        options.timeout = string_to_delta(options.timeout)
 
578
    except ValueError:
 
579
        parser.error("option --timeout: Unparseable time")
 
580
    try:
 
581
        options.interval = string_to_delta(options.interval)
 
582
    except ValueError:
 
583
        parser.error("option --interval: Unparseable time")
 
584
    
 
585
    # Parse config file
 
586
    defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
 
587
    client_config = ConfigParser.SafeConfigParser(defaults)
 
588
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
 
589
    client_config.read("mandos-clients.conf")
 
590
    
 
591
    # From the Avahi server example code
 
592
    DBusGMainLoop(set_as_default=True )
 
593
    main_loop = gobject.MainLoop()
3167
594
    bus = dbus.SystemBus()
3168
 
    # End of Avahi example code
3169
 
    if use_dbus:
3170
 
        try:
3171
 
            bus_name = dbus.service.BusName("se.recompile.Mandos",
3172
 
                                            bus,
3173
 
                                            do_not_queue=True)
3174
 
            old_bus_name = dbus.service.BusName(
3175
 
                "se.bsnet.fukt.Mandos", bus,
3176
 
                do_not_queue=True)
3177
 
        except dbus.exceptions.DBusException as e:
3178
 
            logger.error("Disabling D-Bus:", exc_info=e)
3179
 
            use_dbus = False
3180
 
            server_settings["use_dbus"] = False
3181
 
            tcp_server.use_dbus = False
3182
 
    if zeroconf:
3183
 
        protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
3184
 
        service = AvahiServiceToSyslog(
3185
 
            name=server_settings["servicename"],
3186
 
            servicetype="_mandos._tcp",
3187
 
            protocol=protocol,
3188
 
            bus=bus)
3189
 
        if server_settings["interface"]:
3190
 
            service.interface = if_nametoindex(
3191
 
                server_settings["interface"].encode("utf-8"))
3192
 
 
3193
 
    global multiprocessing_manager
3194
 
    multiprocessing_manager = multiprocessing.Manager()
3195
 
 
3196
 
    client_class = Client
3197
 
    if use_dbus:
3198
 
        client_class = functools.partial(ClientDBus, bus=bus)
3199
 
 
3200
 
    client_settings = Client.config_parser(client_config)
3201
 
    old_client_settings = {}
3202
 
    clients_data = {}
3203
 
 
3204
 
    # This is used to redirect stdout and stderr for checker processes
3205
 
    global wnull
3206
 
    wnull = open(os.devnull, "w")  # A writable /dev/null
3207
 
    # Only used if server is running in foreground but not in debug
3208
 
    # mode
3209
 
    if debug or not foreground:
3210
 
        wnull.close()
3211
 
 
3212
 
    # Get client data and settings from last running state.
3213
 
    if server_settings["restore"]:
3214
 
        try:
3215
 
            with open(stored_state_path, "rb") as stored_state:
3216
 
                if sys.version_info.major == 2:
3217
 
                    clients_data, old_client_settings = pickle.load(
3218
 
                        stored_state)
3219
 
                else:
3220
 
                    bytes_clients_data, bytes_old_client_settings = (
3221
 
                        pickle.load(stored_state, encoding="bytes"))
3222
 
                    #   Fix bytes to strings
3223
 
                    #  clients_data
3224
 
                    # .keys()
3225
 
                    clients_data = {(key.decode("utf-8")
3226
 
                                     if isinstance(key, bytes)
3227
 
                                     else key): value
3228
 
                                    for key, value in
3229
 
                                    bytes_clients_data.items()}
3230
 
                    del bytes_clients_data
3231
 
                    for key in clients_data:
3232
 
                        value = {(k.decode("utf-8")
3233
 
                                  if isinstance(k, bytes) else k): v
3234
 
                                 for k, v in
3235
 
                                 clients_data[key].items()}
3236
 
                        clients_data[key] = value
3237
 
                        # .client_structure
3238
 
                        value["client_structure"] = [
3239
 
                            (s.decode("utf-8")
3240
 
                             if isinstance(s, bytes)
3241
 
                             else s) for s in
3242
 
                            value["client_structure"]]
3243
 
                        # .name & .host
3244
 
                        for k in ("name", "host"):
3245
 
                            if isinstance(value[k], bytes):
3246
 
                                value[k] = value[k].decode("utf-8")
3247
 
                        if "key_id" not in value:
3248
 
                            value["key_id"] = ""
3249
 
                        elif "fingerprint" not in value:
3250
 
                            value["fingerprint"] = ""
3251
 
                    #  old_client_settings
3252
 
                    # .keys()
3253
 
                    old_client_settings = {
3254
 
                        (key.decode("utf-8")
3255
 
                         if isinstance(key, bytes)
3256
 
                         else key): value
3257
 
                        for key, value in
3258
 
                        bytes_old_client_settings.items()}
3259
 
                    del bytes_old_client_settings
3260
 
                    # .host
3261
 
                    for value in old_client_settings.values():
3262
 
                        if isinstance(value["host"], bytes):
3263
 
                            value["host"] = (value["host"]
3264
 
                                             .decode("utf-8"))
3265
 
            os.remove(stored_state_path)
3266
 
        except IOError as e:
3267
 
            if e.errno == errno.ENOENT:
3268
 
                logger.warning("Could not load persistent state:"
3269
 
                               " {}".format(os.strerror(e.errno)))
3270
 
            else:
3271
 
                logger.critical("Could not load persistent state:",
3272
 
                                exc_info=e)
3273
 
                raise
3274
 
        except EOFError as e:
3275
 
            logger.warning("Could not load persistent state: "
3276
 
                           "EOFError:",
3277
 
                           exc_info=e)
3278
 
 
3279
 
    with PGPEngine() as pgp:
3280
 
        for client_name, client in clients_data.items():
3281
 
            # Skip removed clients
3282
 
            if client_name not in client_settings:
3283
 
                continue
3284
 
 
3285
 
            # Decide which value to use after restoring saved state.
3286
 
            # We have three different values: Old config file,
3287
 
            # new config file, and saved state.
3288
 
            # New config value takes precedence if it differs from old
3289
 
            # config value, otherwise use saved state.
3290
 
            for name, value in client_settings[client_name].items():
3291
 
                try:
3292
 
                    # For each value in new config, check if it
3293
 
                    # differs from the old config value (Except for
3294
 
                    # the "secret" attribute)
3295
 
                    if (name != "secret"
3296
 
                        and (value !=
3297
 
                             old_client_settings[client_name][name])):
3298
 
                        client[name] = value
3299
 
                except KeyError:
3300
 
                    pass
3301
 
 
3302
 
            # Clients who has passed its expire date can still be
3303
 
            # enabled if its last checker was successful.  A Client
3304
 
            # whose checker succeeded before we stored its state is
3305
 
            # assumed to have successfully run all checkers during
3306
 
            # downtime.
3307
 
            if client["enabled"]:
3308
 
                if datetime.datetime.utcnow() >= client["expires"]:
3309
 
                    if not client["last_checked_ok"]:
3310
 
                        logger.warning(
3311
 
                            "disabling client {} - Client never "
3312
 
                            "performed a successful checker".format(
3313
 
                                client_name))
3314
 
                        client["enabled"] = False
3315
 
                    elif client["last_checker_status"] != 0:
3316
 
                        logger.warning(
3317
 
                            "disabling client {} - Client last"
3318
 
                            " checker failed with error code"
3319
 
                            " {}".format(
3320
 
                                client_name,
3321
 
                                client["last_checker_status"]))
3322
 
                        client["enabled"] = False
3323
 
                    else:
3324
 
                        client["expires"] = (
3325
 
                            datetime.datetime.utcnow()
3326
 
                            + client["timeout"])
3327
 
                        logger.debug("Last checker succeeded,"
3328
 
                                     " keeping {} enabled".format(
3329
 
                                         client_name))
3330
 
            try:
3331
 
                client["secret"] = pgp.decrypt(
3332
 
                    client["encrypted_secret"],
3333
 
                    client_settings[client_name]["secret"])
3334
 
            except PGPError:
3335
 
                # If decryption fails, we use secret from new settings
3336
 
                logger.debug("Failed to decrypt {} old secret".format(
3337
 
                    client_name))
3338
 
                client["secret"] = (client_settings[client_name]
3339
 
                                    ["secret"])
3340
 
 
3341
 
    # Add/remove clients based on new changes made to config
3342
 
    for client_name in (set(old_client_settings)
3343
 
                        - set(client_settings)):
3344
 
        del clients_data[client_name]
3345
 
    for client_name in (set(client_settings)
3346
 
                        - set(old_client_settings)):
3347
 
        clients_data[client_name] = client_settings[client_name]
3348
 
 
3349
 
    # Create all client objects
3350
 
    for client_name, client in clients_data.items():
3351
 
        tcp_server.clients[client_name] = client_class(
3352
 
            name=client_name,
3353
 
            settings=client,
3354
 
            server_settings=server_settings)
3355
 
 
3356
 
    if not tcp_server.clients:
3357
 
        logger.warning("No clients defined")
3358
 
 
3359
 
    if not foreground:
3360
 
        if pidfile is not None:
3361
 
            pid = os.getpid()
3362
 
            try:
3363
 
                with pidfile:
3364
 
                    print(pid, file=pidfile)
3365
 
            except IOError:
3366
 
                logger.error("Could not write to file %r with PID %d",
3367
 
                             pidfilename, pid)
3368
 
        del pidfile
3369
 
        del pidfilename
3370
 
 
3371
 
    for termsig in (signal.SIGHUP, signal.SIGTERM):
3372
 
        GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,
3373
 
                             lambda: main_loop.quit() and False)
3374
 
 
3375
 
    if use_dbus:
3376
 
 
3377
 
        @alternate_dbus_interfaces(
3378
 
            {"se.recompile.Mandos": "se.bsnet.fukt.Mandos"})
3379
 
        class MandosDBusService(DBusObjectWithObjectManager):
3380
 
            """A D-Bus proxy object"""
3381
 
 
3382
 
            def __init__(self):
3383
 
                dbus.service.Object.__init__(self, bus, "/")
3384
 
 
3385
 
            _interface = "se.recompile.Mandos"
3386
 
 
3387
 
            @dbus.service.signal(_interface, signature="o")
3388
 
            def ClientAdded(self, objpath):
3389
 
                "D-Bus signal"
3390
 
                pass
3391
 
 
3392
 
            @dbus.service.signal(_interface, signature="ss")
3393
 
            def ClientNotFound(self, key_id, address):
3394
 
                "D-Bus signal"
3395
 
                pass
3396
 
 
3397
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3398
 
                               "true"})
3399
 
            @dbus.service.signal(_interface, signature="os")
3400
 
            def ClientRemoved(self, objpath, name):
3401
 
                "D-Bus signal"
3402
 
                pass
3403
 
 
3404
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3405
 
                               "true"})
3406
 
            @dbus.service.method(_interface, out_signature="ao")
3407
 
            def GetAllClients(self):
3408
 
                "D-Bus method"
3409
 
                return dbus.Array(c.dbus_object_path for c in
3410
 
                                  tcp_server.clients.values())
3411
 
 
3412
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3413
 
                               "true"})
3414
 
            @dbus.service.method(_interface,
3415
 
                                 out_signature="a{oa{sv}}")
3416
 
            def GetAllClientsWithProperties(self):
3417
 
                "D-Bus method"
3418
 
                return dbus.Dictionary(
3419
 
                    {c.dbus_object_path: c.GetAll(
3420
 
                        "se.recompile.Mandos.Client")
3421
 
                     for c in tcp_server.clients.values()},
3422
 
                    signature="oa{sv}")
3423
 
 
3424
 
            @dbus.service.method(_interface, in_signature="o")
3425
 
            def RemoveClient(self, object_path):
3426
 
                "D-Bus method"
3427
 
                for c in tcp_server.clients.values():
3428
 
                    if c.dbus_object_path == object_path:
3429
 
                        del tcp_server.clients[c.name]
3430
 
                        c.remove_from_connection()
3431
 
                        # Don't signal the disabling
3432
 
                        c.disable(quiet=True)
3433
 
                        # Emit D-Bus signal for removal
3434
 
                        self.client_removed_signal(c)
3435
 
                        return
3436
 
                raise KeyError(object_path)
3437
 
 
3438
 
            del _interface
3439
 
 
3440
 
            @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
3441
 
                                 out_signature="a{oa{sa{sv}}}")
3442
 
            def GetManagedObjects(self):
3443
 
                """D-Bus method"""
3444
 
                return dbus.Dictionary(
3445
 
                    {client.dbus_object_path:
3446
 
                     dbus.Dictionary(
3447
 
                         {interface: client.GetAll(interface)
3448
 
                          for interface in
3449
 
                          client._get_all_interface_names()})
3450
 
                     for client in tcp_server.clients.values()})
3451
 
 
3452
 
            def client_added_signal(self, client):
3453
 
                """Send the new standard signal and the old signal"""
3454
 
                if use_dbus:
3455
 
                    # New standard signal
3456
 
                    self.InterfacesAdded(
3457
 
                        client.dbus_object_path,
3458
 
                        dbus.Dictionary(
3459
 
                            {interface: client.GetAll(interface)
3460
 
                             for interface in
3461
 
                             client._get_all_interface_names()}))
3462
 
                    # Old signal
3463
 
                    self.ClientAdded(client.dbus_object_path)
3464
 
 
3465
 
            def client_removed_signal(self, client):
3466
 
                """Send the new standard signal and the old signal"""
3467
 
                if use_dbus:
3468
 
                    # New standard signal
3469
 
                    self.InterfacesRemoved(
3470
 
                        client.dbus_object_path,
3471
 
                        client._get_all_interface_names())
3472
 
                    # Old signal
3473
 
                    self.ClientRemoved(client.dbus_object_path,
3474
 
                                       client.name)
3475
 
 
3476
 
        mandos_dbus_service = MandosDBusService()
3477
 
 
3478
 
    # Save modules to variables to exempt the modules from being
3479
 
    # unloaded before the function registered with atexit() is run.
3480
 
    mp = multiprocessing
3481
 
    wn = wnull
3482
 
 
3483
 
    def cleanup():
3484
 
        "Cleanup function; run on exit"
3485
 
        if zeroconf:
3486
 
            service.cleanup()
3487
 
 
3488
 
        mp.active_children()
3489
 
        wn.close()
3490
 
        if not (tcp_server.clients or client_settings):
3491
 
            return
3492
 
 
3493
 
        # Store client before exiting. Secrets are encrypted with key
3494
 
        # based on what config file has. If config file is
3495
 
        # removed/edited, old secret will thus be unrecovable.
3496
 
        clients = {}
3497
 
        with PGPEngine() as pgp:
3498
 
            for client in tcp_server.clients.values():
3499
 
                key = client_settings[client.name]["secret"]
3500
 
                client.encrypted_secret = pgp.encrypt(client.secret,
3501
 
                                                      key)
3502
 
                client_dict = {}
3503
 
 
3504
 
                # A list of attributes that can not be pickled
3505
 
                # + secret.
3506
 
                exclude = {"bus", "changedstate", "secret",
3507
 
                           "checker", "server_settings"}
3508
 
                for name, typ in inspect.getmembers(dbus.service
3509
 
                                                    .Object):
3510
 
                    exclude.add(name)
3511
 
 
3512
 
                client_dict["encrypted_secret"] = (client
3513
 
                                                   .encrypted_secret)
3514
 
                for attr in client.client_structure:
3515
 
                    if attr not in exclude:
3516
 
                        client_dict[attr] = getattr(client, attr)
3517
 
 
3518
 
                clients[client.name] = client_dict
3519
 
                del client_settings[client.name]["secret"]
3520
 
 
3521
 
        try:
3522
 
            with tempfile.NamedTemporaryFile(
3523
 
                    mode='wb',
3524
 
                    suffix=".pickle",
3525
 
                    prefix='clients-',
3526
 
                    dir=os.path.dirname(stored_state_path),
3527
 
                    delete=False) as stored_state:
3528
 
                pickle.dump((clients, client_settings), stored_state,
3529
 
                            protocol=2)
3530
 
                tempname = stored_state.name
3531
 
            os.rename(tempname, stored_state_path)
3532
 
        except (IOError, OSError) as e:
3533
 
            if not debug:
3534
 
                try:
3535
 
                    os.remove(tempname)
3536
 
                except NameError:
3537
 
                    pass
3538
 
            if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
3539
 
                logger.warning("Could not save persistent state: {}"
3540
 
                               .format(os.strerror(e.errno)))
3541
 
            else:
3542
 
                logger.warning("Could not save persistent state:",
3543
 
                               exc_info=e)
3544
 
                raise
3545
 
 
3546
 
        # Delete all clients, and settings from config
3547
 
        while tcp_server.clients:
3548
 
            name, client = tcp_server.clients.popitem()
3549
 
            if use_dbus:
3550
 
                client.remove_from_connection()
3551
 
            # Don't signal the disabling
3552
 
            client.disable(quiet=True)
3553
 
            # Emit D-Bus signal for removal
3554
 
            if use_dbus:
3555
 
                mandos_dbus_service.client_removed_signal(client)
3556
 
        client_settings.clear()
3557
 
 
3558
 
    atexit.register(cleanup)
3559
 
 
3560
 
    for client in tcp_server.clients.values():
3561
 
        if use_dbus:
3562
 
            # Emit D-Bus signal for adding
3563
 
            mandos_dbus_service.client_added_signal(client)
3564
 
        # Need to initiate checking of clients
3565
 
        if client.enabled:
3566
 
            client.init_checker()
3567
 
 
3568
 
    tcp_server.enable()
3569
 
    tcp_server.server_activate()
3570
 
 
3571
 
    # Find out what port we got
3572
 
    if zeroconf:
3573
 
        service.port = tcp_server.socket.getsockname()[1]
3574
 
    if use_ipv6:
3575
 
        logger.info("Now listening on address %r, port %d,"
3576
 
                    " flowinfo %d, scope_id %d",
3577
 
                    *tcp_server.socket.getsockname())
3578
 
    else:                       # IPv4
3579
 
        logger.info("Now listening on address %r, port %d",
3580
 
                    *tcp_server.socket.getsockname())
3581
 
 
3582
 
    # service.interface = tcp_server.socket.getsockname()[3]
3583
 
 
 
595
    server = dbus.Interface(
 
596
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
597
            avahi.DBUS_INTERFACE_SERVER )
 
598
    # End of Avahi example code
 
599
    
 
600
    debug = options.debug
 
601
    
 
602
    clients = Set()
 
603
    def remove_from_clients(client):
 
604
        clients.remove(client)
 
605
        if not clients:
 
606
            if debug:
 
607
                sys.stderr.write(u"No clients left, exiting\n")
 
608
            main_loop.quit()
 
609
    
 
610
    clients.update(Set(Client(name=section, options=options,
 
611
                              stop_hook = remove_from_clients,
 
612
                              **(dict(client_config\
 
613
                                      .items(section))))
 
614
                       for section in client_config.sections()))
 
615
    for client in clients:
 
616
        client.start()
 
617
    
 
618
    tcp_server = IPv6_TCPServer((None, options.port),
 
619
                                tcp_handler,
 
620
                                options=options,
 
621
                                clients=clients)
 
622
    # Find out what random port we got
 
623
    servicePort = tcp_server.socket.getsockname()[1]
 
624
    if debug:
 
625
        sys.stderr.write(u"Now listening on port %d\n" % servicePort)
 
626
    
 
627
    if options.interface is not None:
 
628
        serviceInterface = if_nametoindex(options.interface)
 
629
    
 
630
    # From the Avahi server example code
 
631
    server.connect_to_signal("StateChanged", server_state_changed)
 
632
    server_state_changed(server.GetState())
 
633
    # End of Avahi example code
 
634
    
 
635
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
636
                         lambda *args, **kwargs:
 
637
                         tcp_server.handle_request(*args[2:],
 
638
                                                   **kwargs) or True)
3584
639
    try:
3585
 
        if zeroconf:
3586
 
            # From the Avahi example code
3587
 
            try:
3588
 
                service.activate()
3589
 
            except dbus.exceptions.DBusException as error:
3590
 
                logger.critical("D-Bus Exception", exc_info=error)
3591
 
                cleanup()
3592
 
                sys.exit(1)
3593
 
            # End of Avahi example code
3594
 
 
3595
 
        GLib.io_add_watch(tcp_server.fileno(), GLib.IO_IN,
3596
 
                          lambda *args, **kwargs:
3597
 
                          (tcp_server.handle_request
3598
 
                           (*args[2:], **kwargs) or True))
3599
 
 
3600
 
        logger.debug("Starting main loop")
3601
640
        main_loop.run()
3602
 
    except AvahiError as error:
3603
 
        logger.critical("Avahi Error", exc_info=error)
3604
 
        cleanup()
3605
 
        sys.exit(1)
3606
641
    except KeyboardInterrupt:
3607
 
        if debug:
3608
 
            print("", file=sys.stderr)
3609
 
        logger.debug("Server received KeyboardInterrupt")
3610
 
    logger.debug("Server exiting")
3611
 
    # Must run before the D-Bus bus name gets deregistered
3612
 
    cleanup()
3613
 
 
3614
 
 
3615
 
if __name__ == '__main__':
3616
 
    main()
 
642
        print
 
643
    
 
644
    # Cleanup here
 
645
 
 
646
    # From the Avahi server example code
 
647
    if not group is None:
 
648
        group.Free()
 
649
    # End of Avahi example code
 
650
    
 
651
    for client in clients:
 
652
        client.stop_hook = None
 
653
        client.stop()