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

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added added

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Lines of Context:
1
 
#!/usr/bin/python3 -bI
2
 
# -*- mode: python; after-save-hook: (lambda () (let ((command (if (fboundp 'file-local-name) (file-local-name (buffer-file-name)) (or (file-remote-p (buffer-file-name) 'localname) (buffer-file-name))))) (if (= (progn (if (get-buffer "*Test*") (kill-buffer "*Test*")) (process-file-shell-command (format "%s --check" (shell-quote-argument command)) nil "*Test*")) 0) (let ((w (get-buffer-window "*Test*"))) (if w (delete-window w))) (progn (with-current-buffer "*Test*" (compilation-mode)) (display-buffer "*Test*" '(display-buffer-in-side-window)))))); 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
 
1
#!/usr/bin/python
 
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
 
import unittest
81
24
 
82
25
import dbus
83
 
import dbus.service
84
 
import gi
85
 
from gi.repository import GLib
 
26
import gobject
 
27
import avahi
86
28
from dbus.mainloop.glib import DBusGMainLoop
87
29
import ctypes
88
 
import ctypes.util
89
 
import xml.dom.minidom
90
 
import inspect
91
 
 
92
 
if sys.version_info.major == 2:
93
 
    __metaclass__ = type
94
 
    str = unicode
95
 
 
96
 
# Show warnings by default
97
 
if not sys.warnoptions:
98
 
    import warnings
99
 
    warnings.simplefilter("default")
100
 
 
101
 
# Try to find the value of SO_BINDTODEVICE:
102
 
try:
103
 
    # This is where SO_BINDTODEVICE is in Python 3.3 (or 3.4?) and
104
 
    # newer, and it is also the most natural place for it:
105
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
106
 
except AttributeError:
107
 
    try:
108
 
        # This is where SO_BINDTODEVICE was up to and including Python
109
 
        # 2.6, and also 3.2:
110
 
        from IN import SO_BINDTODEVICE
111
 
    except ImportError:
112
 
        # In Python 2.7 it seems to have been removed entirely.
113
 
        # Try running the C preprocessor:
114
 
        try:
115
 
            cc = subprocess.Popen(["cc", "--language=c", "-E",
116
 
                                   "/dev/stdin"],
117
 
                                  stdin=subprocess.PIPE,
118
 
                                  stdout=subprocess.PIPE)
119
 
            stdout = cc.communicate(
120
 
                "#include <sys/socket.h>\nSO_BINDTODEVICE\n")[0]
121
 
            SO_BINDTODEVICE = int(stdout.splitlines()[-1])
122
 
        except (OSError, ValueError, IndexError):
123
 
            # No value found
124
 
            SO_BINDTODEVICE = None
125
 
 
126
 
if sys.version_info < (3, 2):
127
 
    configparser.Configparser = configparser.SafeConfigParser
128
 
 
129
 
version = "1.8.9"
130
 
stored_state_file = "clients.pickle"
131
 
 
132
 
logger = logging.getLogger()
133
 
logging.captureWarnings(True)   # Show warnings via the logging system
134
 
syslogger = None
135
 
 
136
 
try:
137
 
    if_nametoindex = ctypes.cdll.LoadLibrary(
138
 
        ctypes.util.find_library("c")).if_nametoindex
139
 
except (OSError, AttributeError):
140
 
 
141
 
    def if_nametoindex(interface):
142
 
        "Get an interface index the hard way, i.e. using fcntl()"
143
 
        SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
144
 
        with contextlib.closing(socket.socket()) as s:
145
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
146
 
                                struct.pack(b"16s16x", interface))
147
 
        interface_index = struct.unpack("I", ifreq[16:20])[0]
148
 
        return interface_index
149
 
 
150
 
 
151
 
def copy_function(func):
152
 
    """Make a copy of a function"""
153
 
    if sys.version_info.major == 2:
154
 
        return types.FunctionType(func.func_code,
155
 
                                  func.func_globals,
156
 
                                  func.func_name,
157
 
                                  func.func_defaults,
158
 
                                  func.func_closure)
159
 
    else:
160
 
        return types.FunctionType(func.__code__,
161
 
                                  func.__globals__,
162
 
                                  func.__name__,
163
 
                                  func.__defaults__,
164
 
                                  func.__closure__)
165
 
 
166
 
 
167
 
def initlogger(debug, level=logging.WARNING):
168
 
    """init logger and add loglevel"""
169
 
 
170
 
    global syslogger
171
 
    syslogger = (logging.handlers.SysLogHandler(
172
 
        facility=logging.handlers.SysLogHandler.LOG_DAEMON,
173
 
        address="/dev/log"))
174
 
    syslogger.setFormatter(logging.Formatter
175
 
                           ('Mandos [%(process)d]: %(levelname)s:'
176
 
                            ' %(message)s'))
177
 
    logger.addHandler(syslogger)
178
 
 
179
 
    if debug:
180
 
        console = logging.StreamHandler()
181
 
        console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
182
 
                                               ' [%(process)d]:'
183
 
                                               ' %(levelname)s:'
184
 
                                               ' %(message)s'))
185
 
        logger.addHandler(console)
186
 
    logger.setLevel(level)
187
 
 
188
 
 
189
 
class PGPError(Exception):
190
 
    """Exception if encryption/decryption fails"""
191
 
    pass
192
 
 
193
 
 
194
 
class PGPEngine:
195
 
    """A simple class for OpenPGP symmetric encryption & decryption"""
196
 
 
197
 
    def __init__(self):
198
 
        self.tempdir = tempfile.mkdtemp(prefix="mandos-")
199
 
        self.gpg = "gpg"
200
 
        try:
201
 
            output = subprocess.check_output(["gpgconf"])
202
 
            for line in output.splitlines():
203
 
                name, text, path = line.split(b":")
204
 
                if name == b"gpg":
205
 
                    self.gpg = path
206
 
                    break
207
 
        except OSError as e:
208
 
            if e.errno != errno.ENOENT:
209
 
                raise
210
 
        self.gnupgargs = ['--batch',
211
 
                          '--homedir', self.tempdir,
212
 
                          '--force-mdc',
213
 
                          '--quiet']
214
 
        # Only GPG version 1 has the --no-use-agent option.
215
 
        if self.gpg == b"gpg" or self.gpg.endswith(b"/gpg"):
216
 
            self.gnupgargs.append("--no-use-agent")
217
 
 
218
 
    def __enter__(self):
219
 
        return self
220
 
 
221
 
    def __exit__(self, exc_type, exc_value, traceback):
222
 
        self._cleanup()
223
 
        return False
224
 
 
225
 
    def __del__(self):
226
 
        self._cleanup()
227
 
 
228
 
    def _cleanup(self):
229
 
        if self.tempdir is not None:
230
 
            # Delete contents of tempdir
231
 
            for root, dirs, files in os.walk(self.tempdir,
232
 
                                             topdown=False):
233
 
                for filename in files:
234
 
                    os.remove(os.path.join(root, filename))
235
 
                for dirname in dirs:
236
 
                    os.rmdir(os.path.join(root, dirname))
237
 
            # Remove tempdir
238
 
            os.rmdir(self.tempdir)
239
 
            self.tempdir = None
240
 
 
241
 
    def password_encode(self, password):
242
 
        # Passphrase can not be empty and can not contain newlines or
243
 
        # NUL bytes.  So we prefix it and hex encode it.
244
 
        encoded = b"mandos" + binascii.hexlify(password)
245
 
        if len(encoded) > 2048:
246
 
            # GnuPG can't handle long passwords, so encode differently
247
 
            encoded = (b"mandos" + password.replace(b"\\", b"\\\\")
248
 
                       .replace(b"\n", b"\\n")
249
 
                       .replace(b"\0", b"\\x00"))
250
 
        return encoded
251
 
 
252
 
    def encrypt(self, data, password):
253
 
        passphrase = self.password_encode(password)
254
 
        with tempfile.NamedTemporaryFile(
255
 
                dir=self.tempdir) as passfile:
256
 
            passfile.write(passphrase)
257
 
            passfile.flush()
258
 
            proc = subprocess.Popen([self.gpg, '--symmetric',
259
 
                                     '--passphrase-file',
260
 
                                     passfile.name]
261
 
                                    + self.gnupgargs,
262
 
                                    stdin=subprocess.PIPE,
263
 
                                    stdout=subprocess.PIPE,
264
 
                                    stderr=subprocess.PIPE)
265
 
            ciphertext, err = proc.communicate(input=data)
266
 
        if proc.returncode != 0:
267
 
            raise PGPError(err)
268
 
        return ciphertext
269
 
 
270
 
    def decrypt(self, data, password):
271
 
        passphrase = self.password_encode(password)
272
 
        with tempfile.NamedTemporaryFile(
273
 
                dir=self.tempdir) as passfile:
274
 
            passfile.write(passphrase)
275
 
            passfile.flush()
276
 
            proc = subprocess.Popen([self.gpg, '--decrypt',
277
 
                                     '--passphrase-file',
278
 
                                     passfile.name]
279
 
                                    + self.gnupgargs,
280
 
                                    stdin=subprocess.PIPE,
281
 
                                    stdout=subprocess.PIPE,
282
 
                                    stderr=subprocess.PIPE)
283
 
            decrypted_plaintext, err = proc.communicate(input=data)
284
 
        if proc.returncode != 0:
285
 
            raise PGPError(err)
286
 
        return decrypted_plaintext
287
 
 
288
 
 
289
 
# Pretend that we have an Avahi module
290
 
class avahi:
291
 
    """This isn't so much a class as it is a module-like namespace."""
292
 
    IF_UNSPEC = -1               # avahi-common/address.h
293
 
    PROTO_UNSPEC = -1            # avahi-common/address.h
294
 
    PROTO_INET = 0               # avahi-common/address.h
295
 
    PROTO_INET6 = 1              # avahi-common/address.h
296
 
    DBUS_NAME = "org.freedesktop.Avahi"
297
 
    DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"
298
 
    DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"
299
 
    DBUS_PATH_SERVER = "/"
300
 
 
301
 
    @staticmethod
302
 
    def string_array_to_txt_array(t):
303
 
        return dbus.Array((dbus.ByteArray(s.encode("utf-8"))
304
 
                           for s in t), signature="ay")
305
 
    ENTRY_GROUP_ESTABLISHED = 2  # avahi-common/defs.h
306
 
    ENTRY_GROUP_COLLISION = 3    # avahi-common/defs.h
307
 
    ENTRY_GROUP_FAILURE = 4      # avahi-common/defs.h
308
 
    SERVER_INVALID = 0           # avahi-common/defs.h
309
 
    SERVER_REGISTERING = 1       # avahi-common/defs.h
310
 
    SERVER_RUNNING = 2           # avahi-common/defs.h
311
 
    SERVER_COLLISION = 3         # avahi-common/defs.h
312
 
    SERVER_FAILURE = 4           # avahi-common/defs.h
313
 
 
314
 
 
315
 
class AvahiError(Exception):
316
 
    def __init__(self, value, *args, **kwargs):
317
 
        self.value = value
318
 
        return super(AvahiError, self).__init__(value, *args,
319
 
                                                **kwargs)
320
 
 
321
 
 
322
 
class AvahiServiceError(AvahiError):
323
 
    pass
324
 
 
325
 
 
326
 
class AvahiGroupError(AvahiError):
327
 
    pass
328
 
 
329
 
 
330
 
class AvahiService:
331
 
    """An Avahi (Zeroconf) service.
332
 
 
333
 
    Attributes:
334
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
335
 
               Used to optionally bind to the specified interface.
336
 
    name: string; Example: 'Mandos'
337
 
    type: string; Example: '_mandos._tcp'.
338
 
     See <https://www.iana.org/assignments/service-names-port-numbers>
339
 
    port: integer; what port to announce
340
 
    TXT: list of strings; TXT record for the service
341
 
    domain: string; Domain to publish on, default to .local if empty.
342
 
    host: string; Host to publish records for, default is localhost
343
 
    max_renames: integer; maximum number of renames
344
 
    rename_count: integer; counter so we only rename after collisions
345
 
                  a sensible number of times
346
 
    group: D-Bus Entry Group
347
 
    server: D-Bus Server
348
 
    bus: dbus.SystemBus()
349
 
    """
350
 
 
351
 
    def __init__(self,
352
 
                 interface=avahi.IF_UNSPEC,
353
 
                 name=None,
354
 
                 servicetype=None,
355
 
                 port=None,
356
 
                 TXT=None,
357
 
                 domain="",
358
 
                 host="",
359
 
                 max_renames=32768,
360
 
                 protocol=avahi.PROTO_UNSPEC,
361
 
                 bus=None):
362
 
        self.interface = interface
363
 
        self.name = name
364
 
        self.type = servicetype
365
 
        self.port = port
366
 
        self.TXT = TXT if TXT is not None else []
367
 
        self.domain = domain
368
 
        self.host = host
369
 
        self.rename_count = 0
370
 
        self.max_renames = max_renames
371
 
        self.protocol = protocol
372
 
        self.group = None       # our entry group
373
 
        self.server = None
374
 
        self.bus = bus
375
 
        self.entry_group_state_changed_match = None
376
 
 
377
 
    def rename(self, remove=True):
378
 
        """Derived from the Avahi example code"""
379
 
        if self.rename_count >= self.max_renames:
380
 
            logger.critical("No suitable Zeroconf service name found"
381
 
                            " after %i retries, exiting.",
382
 
                            self.rename_count)
383
 
            raise AvahiServiceError("Too many renames")
384
 
        self.name = str(
385
 
            self.server.GetAlternativeServiceName(self.name))
386
 
        self.rename_count += 1
387
 
        logger.info("Changing Zeroconf service name to %r ...",
388
 
                    self.name)
389
 
        if remove:
390
 
            self.remove()
391
 
        try:
392
 
            self.add()
393
 
        except dbus.exceptions.DBusException as error:
394
 
            if (error.get_dbus_name()
395
 
                == "org.freedesktop.Avahi.CollisionError"):
396
 
                logger.info("Local Zeroconf service name collision.")
397
 
                return self.rename(remove=False)
398
 
            else:
399
 
                logger.critical("D-Bus Exception", exc_info=error)
400
 
                self.cleanup()
401
 
                os._exit(1)
402
 
 
403
 
    def remove(self):
404
 
        """Derived from the Avahi example code"""
405
 
        if self.entry_group_state_changed_match is not None:
406
 
            self.entry_group_state_changed_match.remove()
407
 
            self.entry_group_state_changed_match = None
408
 
        if self.group is not None:
409
 
            self.group.Reset()
410
 
 
411
 
    def add(self):
412
 
        """Derived from the Avahi example code"""
413
 
        self.remove()
414
 
        if self.group is None:
415
 
            self.group = dbus.Interface(
416
 
                self.bus.get_object(avahi.DBUS_NAME,
417
 
                                    self.server.EntryGroupNew()),
418
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
419
 
        self.entry_group_state_changed_match = (
420
 
            self.group.connect_to_signal(
421
 
                'StateChanged', self.entry_group_state_changed))
422
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
423
 
                     self.name, self.type)
424
 
        self.group.AddService(
425
 
            self.interface,
426
 
            self.protocol,
427
 
            dbus.UInt32(0),     # flags
428
 
            self.name, self.type,
429
 
            self.domain, self.host,
430
 
            dbus.UInt16(self.port),
431
 
            avahi.string_array_to_txt_array(self.TXT))
432
 
        self.group.Commit()
433
 
 
434
 
    def entry_group_state_changed(self, state, error):
435
 
        """Derived from the Avahi example code"""
436
 
        logger.debug("Avahi entry group state change: %i", state)
437
 
 
438
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
439
 
            logger.debug("Zeroconf service established.")
440
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
441
 
            logger.info("Zeroconf service name collision.")
442
 
            self.rename()
443
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
444
 
            logger.critical("Avahi: Error in group state changed %s",
445
 
                            str(error))
446
 
            raise AvahiGroupError("State changed: {!s}".format(error))
447
 
 
448
 
    def cleanup(self):
449
 
        """Derived from the Avahi example code"""
450
 
        if self.group is not None:
451
 
            try:
452
 
                self.group.Free()
453
 
            except (dbus.exceptions.UnknownMethodException,
454
 
                    dbus.exceptions.DBusException):
455
 
                pass
456
 
            self.group = None
457
 
        self.remove()
458
 
 
459
 
    def server_state_changed(self, state, error=None):
460
 
        """Derived from the Avahi example code"""
461
 
        logger.debug("Avahi server state change: %i", state)
462
 
        bad_states = {
463
 
            avahi.SERVER_INVALID: "Zeroconf server invalid",
464
 
            avahi.SERVER_REGISTERING: None,
465
 
            avahi.SERVER_COLLISION: "Zeroconf server name collision",
466
 
            avahi.SERVER_FAILURE: "Zeroconf server failure",
467
 
        }
468
 
        if state in bad_states:
469
 
            if bad_states[state] is not None:
470
 
                if error is None:
471
 
                    logger.error(bad_states[state])
472
 
                else:
473
 
                    logger.error(bad_states[state] + ": %r", error)
474
 
            self.cleanup()
475
 
        elif state == avahi.SERVER_RUNNING:
476
 
            try:
477
 
                self.add()
478
 
            except dbus.exceptions.DBusException as error:
479
 
                if (error.get_dbus_name()
480
 
                    == "org.freedesktop.Avahi.CollisionError"):
481
 
                    logger.info("Local Zeroconf service name"
482
 
                                " collision.")
483
 
                    return self.rename(remove=False)
484
 
                else:
485
 
                    logger.critical("D-Bus Exception", exc_info=error)
486
 
                    self.cleanup()
487
 
                    os._exit(1)
488
 
        else:
489
 
            if error is None:
490
 
                logger.debug("Unknown state: %r", state)
491
 
            else:
492
 
                logger.debug("Unknown state: %r: %r", state, error)
493
 
 
494
 
    def activate(self):
495
 
        """Derived from the Avahi example code"""
496
 
        if self.server is None:
497
 
            self.server = dbus.Interface(
498
 
                self.bus.get_object(avahi.DBUS_NAME,
499
 
                                    avahi.DBUS_PATH_SERVER,
500
 
                                    follow_name_owner_changes=True),
501
 
                avahi.DBUS_INTERFACE_SERVER)
502
 
        self.server.connect_to_signal("StateChanged",
503
 
                                      self.server_state_changed)
504
 
        self.server_state_changed(self.server.GetState())
505
 
 
506
 
 
507
 
class AvahiServiceToSyslog(AvahiService):
508
 
    def rename(self, *args, **kwargs):
509
 
        """Add the new name to the syslog messages"""
510
 
        ret = super(AvahiServiceToSyslog, self).rename(*args, **kwargs)
511
 
        syslogger.setFormatter(logging.Formatter(
512
 
            'Mandos ({}) [%(process)d]: %(levelname)s: %(message)s'
513
 
            .format(self.name)))
514
 
        return ret
515
 
 
516
 
 
517
 
# Pretend that we have a GnuTLS module
518
 
class gnutls:
519
 
    """This isn't so much a class as it is a module-like namespace."""
520
 
 
521
 
    library = ctypes.util.find_library("gnutls")
522
 
    if library is None:
523
 
        library = ctypes.util.find_library("gnutls-deb0")
524
 
    _library = ctypes.cdll.LoadLibrary(library)
525
 
    del library
526
 
 
527
 
    # Unless otherwise indicated, the constants and types below are
528
 
    # all from the gnutls/gnutls.h C header file.
529
 
 
530
 
    # Constants
531
 
    E_SUCCESS = 0
532
 
    E_INTERRUPTED = -52
533
 
    E_AGAIN = -28
534
 
    CRT_OPENPGP = 2
535
 
    CRT_RAWPK = 3
536
 
    CLIENT = 2
537
 
    SHUT_RDWR = 0
538
 
    CRD_CERTIFICATE = 1
539
 
    E_NO_CERTIFICATE_FOUND = -49
540
 
    X509_FMT_DER = 0
541
 
    NO_TICKETS = 1<<10
542
 
    ENABLE_RAWPK = 1<<18
543
 
    CTYPE_PEERS = 3
544
 
    KEYID_USE_SHA256 = 1        # gnutls/x509.h
545
 
    OPENPGP_FMT_RAW = 0         # gnutls/openpgp.h
546
 
 
547
 
    # Types
548
 
    class session_int(ctypes.Structure):
549
 
        _fields_ = []
550
 
    session_t = ctypes.POINTER(session_int)
551
 
 
552
 
    class certificate_credentials_st(ctypes.Structure):
553
 
        _fields_ = []
554
 
    certificate_credentials_t = ctypes.POINTER(
555
 
        certificate_credentials_st)
556
 
    certificate_type_t = ctypes.c_int
557
 
 
558
 
    class datum_t(ctypes.Structure):
559
 
        _fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),
560
 
                    ('size', ctypes.c_uint)]
561
 
 
562
 
    class openpgp_crt_int(ctypes.Structure):
563
 
        _fields_ = []
564
 
    openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)
565
 
    openpgp_crt_fmt_t = ctypes.c_int  # gnutls/openpgp.h
566
 
    log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)
567
 
    credentials_type_t = ctypes.c_int
568
 
    transport_ptr_t = ctypes.c_void_p
569
 
    close_request_t = ctypes.c_int
570
 
 
571
 
    # Exceptions
572
 
    class Error(Exception):
573
 
        def __init__(self, message=None, code=None, args=()):
574
 
            # Default usage is by a message string, but if a return
575
 
            # code is passed, convert it to a string with
576
 
            # gnutls.strerror()
577
 
            self.code = code
578
 
            if message is None and code is not None:
579
 
                message = gnutls.strerror(code)
580
 
            return super(gnutls.Error, self).__init__(
581
 
                message, *args)
582
 
 
583
 
    class CertificateSecurityError(Error):
584
 
        pass
585
 
 
586
 
    # Classes
587
 
    class Credentials:
588
 
        def __init__(self):
589
 
            self._c_object = gnutls.certificate_credentials_t()
590
 
            gnutls.certificate_allocate_credentials(
591
 
                ctypes.byref(self._c_object))
592
 
            self.type = gnutls.CRD_CERTIFICATE
593
 
 
594
 
        def __del__(self):
595
 
            gnutls.certificate_free_credentials(self._c_object)
596
 
 
597
 
    class ClientSession:
598
 
        def __init__(self, socket, credentials=None):
599
 
            self._c_object = gnutls.session_t()
600
 
            gnutls_flags = gnutls.CLIENT
601
 
            if gnutls.check_version(b"3.5.6"):
602
 
                gnutls_flags |= gnutls.NO_TICKETS
603
 
            if gnutls.has_rawpk:
604
 
                gnutls_flags |= gnutls.ENABLE_RAWPK
605
 
            gnutls.init(ctypes.byref(self._c_object), gnutls_flags)
606
 
            del gnutls_flags
607
 
            gnutls.set_default_priority(self._c_object)
608
 
            gnutls.transport_set_ptr(self._c_object, socket.fileno())
609
 
            gnutls.handshake_set_private_extensions(self._c_object,
610
 
                                                    True)
611
 
            self.socket = socket
612
 
            if credentials is None:
613
 
                credentials = gnutls.Credentials()
614
 
            gnutls.credentials_set(self._c_object, credentials.type,
615
 
                                   ctypes.cast(credentials._c_object,
616
 
                                               ctypes.c_void_p))
617
 
            self.credentials = credentials
618
 
 
619
 
        def __del__(self):
620
 
            gnutls.deinit(self._c_object)
621
 
 
622
 
        def handshake(self):
623
 
            return gnutls.handshake(self._c_object)
624
 
 
625
 
        def send(self, data):
626
 
            data = bytes(data)
627
 
            data_len = len(data)
628
 
            while data_len > 0:
629
 
                data_len -= gnutls.record_send(self._c_object,
630
 
                                               data[-data_len:],
631
 
                                               data_len)
632
 
 
633
 
        def bye(self):
634
 
            return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)
635
 
 
636
 
    # Error handling functions
637
 
    def _error_code(result):
638
 
        """A function to raise exceptions on errors, suitable
639
 
        for the 'restype' attribute on ctypes functions"""
640
 
        if result >= 0:
641
 
            return result
642
 
        if result == gnutls.E_NO_CERTIFICATE_FOUND:
643
 
            raise gnutls.CertificateSecurityError(code=result)
644
 
        raise gnutls.Error(code=result)
645
 
 
646
 
    def _retry_on_error(result, func, arguments):
647
 
        """A function to retry on some errors, suitable
648
 
        for the 'errcheck' attribute on ctypes functions"""
649
 
        while result < 0:
650
 
            if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):
651
 
                return _error_code(result)
652
 
            result = func(*arguments)
653
 
        return result
654
 
 
655
 
    # Unless otherwise indicated, the function declarations below are
656
 
    # all from the gnutls/gnutls.h C header file.
657
 
 
658
 
    # Functions
659
 
    priority_set_direct = _library.gnutls_priority_set_direct
660
 
    priority_set_direct.argtypes = [session_t, ctypes.c_char_p,
661
 
                                    ctypes.POINTER(ctypes.c_char_p)]
662
 
    priority_set_direct.restype = _error_code
663
 
 
664
 
    init = _library.gnutls_init
665
 
    init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]
666
 
    init.restype = _error_code
667
 
 
668
 
    set_default_priority = _library.gnutls_set_default_priority
669
 
    set_default_priority.argtypes = [session_t]
670
 
    set_default_priority.restype = _error_code
671
 
 
672
 
    record_send = _library.gnutls_record_send
673
 
    record_send.argtypes = [session_t, ctypes.c_void_p,
674
 
                            ctypes.c_size_t]
675
 
    record_send.restype = ctypes.c_ssize_t
676
 
    record_send.errcheck = _retry_on_error
677
 
 
678
 
    certificate_allocate_credentials = (
679
 
        _library.gnutls_certificate_allocate_credentials)
680
 
    certificate_allocate_credentials.argtypes = [
681
 
        ctypes.POINTER(certificate_credentials_t)]
682
 
    certificate_allocate_credentials.restype = _error_code
683
 
 
684
 
    certificate_free_credentials = (
685
 
        _library.gnutls_certificate_free_credentials)
686
 
    certificate_free_credentials.argtypes = [
687
 
        certificate_credentials_t]
688
 
    certificate_free_credentials.restype = None
689
 
 
690
 
    handshake_set_private_extensions = (
691
 
        _library.gnutls_handshake_set_private_extensions)
692
 
    handshake_set_private_extensions.argtypes = [session_t,
693
 
                                                 ctypes.c_int]
694
 
    handshake_set_private_extensions.restype = None
695
 
 
696
 
    credentials_set = _library.gnutls_credentials_set
697
 
    credentials_set.argtypes = [session_t, credentials_type_t,
698
 
                                ctypes.c_void_p]
699
 
    credentials_set.restype = _error_code
700
 
 
701
 
    strerror = _library.gnutls_strerror
702
 
    strerror.argtypes = [ctypes.c_int]
703
 
    strerror.restype = ctypes.c_char_p
704
 
 
705
 
    certificate_type_get = _library.gnutls_certificate_type_get
706
 
    certificate_type_get.argtypes = [session_t]
707
 
    certificate_type_get.restype = _error_code
708
 
 
709
 
    certificate_get_peers = _library.gnutls_certificate_get_peers
710
 
    certificate_get_peers.argtypes = [session_t,
711
 
                                      ctypes.POINTER(ctypes.c_uint)]
712
 
    certificate_get_peers.restype = ctypes.POINTER(datum_t)
713
 
 
714
 
    global_set_log_level = _library.gnutls_global_set_log_level
715
 
    global_set_log_level.argtypes = [ctypes.c_int]
716
 
    global_set_log_level.restype = None
717
 
 
718
 
    global_set_log_function = _library.gnutls_global_set_log_function
719
 
    global_set_log_function.argtypes = [log_func]
720
 
    global_set_log_function.restype = None
721
 
 
722
 
    deinit = _library.gnutls_deinit
723
 
    deinit.argtypes = [session_t]
724
 
    deinit.restype = None
725
 
 
726
 
    handshake = _library.gnutls_handshake
727
 
    handshake.argtypes = [session_t]
728
 
    handshake.restype = _error_code
729
 
    handshake.errcheck = _retry_on_error
730
 
 
731
 
    transport_set_ptr = _library.gnutls_transport_set_ptr
732
 
    transport_set_ptr.argtypes = [session_t, transport_ptr_t]
733
 
    transport_set_ptr.restype = None
734
 
 
735
 
    bye = _library.gnutls_bye
736
 
    bye.argtypes = [session_t, close_request_t]
737
 
    bye.restype = _error_code
738
 
    bye.errcheck = _retry_on_error
739
 
 
740
 
    check_version = _library.gnutls_check_version
741
 
    check_version.argtypes = [ctypes.c_char_p]
742
 
    check_version.restype = ctypes.c_char_p
743
 
 
744
 
    _need_version = b"3.3.0"
745
 
    if check_version(_need_version) is None:
746
 
        raise self.Error("Needs GnuTLS {} or later"
747
 
                         .format(_need_version))
748
 
 
749
 
    _tls_rawpk_version = b"3.6.6"
750
 
    has_rawpk = bool(check_version(_tls_rawpk_version))
751
 
 
752
 
    if has_rawpk:
753
 
        # Types
754
 
        class pubkey_st(ctypes.Structure):
755
 
            _fields = []
756
 
        pubkey_t = ctypes.POINTER(pubkey_st)
757
 
 
758
 
        x509_crt_fmt_t = ctypes.c_int
759
 
 
760
 
        # All the function declarations below are from gnutls/abstract.h
761
 
        pubkey_init = _library.gnutls_pubkey_init
762
 
        pubkey_init.argtypes = [ctypes.POINTER(pubkey_t)]
763
 
        pubkey_init.restype = _error_code
764
 
 
765
 
        pubkey_import = _library.gnutls_pubkey_import
766
 
        pubkey_import.argtypes = [pubkey_t, ctypes.POINTER(datum_t),
767
 
                                  x509_crt_fmt_t]
768
 
        pubkey_import.restype = _error_code
769
 
 
770
 
        pubkey_get_key_id = _library.gnutls_pubkey_get_key_id
771
 
        pubkey_get_key_id.argtypes = [pubkey_t, ctypes.c_int,
772
 
                                      ctypes.POINTER(ctypes.c_ubyte),
773
 
                                      ctypes.POINTER(ctypes.c_size_t)]
774
 
        pubkey_get_key_id.restype = _error_code
775
 
 
776
 
        pubkey_deinit = _library.gnutls_pubkey_deinit
777
 
        pubkey_deinit.argtypes = [pubkey_t]
778
 
        pubkey_deinit.restype = None
779
 
    else:
780
 
        # All the function declarations below are from gnutls/openpgp.h
781
 
 
782
 
        openpgp_crt_init = _library.gnutls_openpgp_crt_init
783
 
        openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]
784
 
        openpgp_crt_init.restype = _error_code
785
 
 
786
 
        openpgp_crt_import = _library.gnutls_openpgp_crt_import
787
 
        openpgp_crt_import.argtypes = [openpgp_crt_t,
788
 
                                       ctypes.POINTER(datum_t),
789
 
                                       openpgp_crt_fmt_t]
790
 
        openpgp_crt_import.restype = _error_code
791
 
 
792
 
        openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self
793
 
        openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,
794
 
                                            ctypes.POINTER(ctypes.c_uint)]
795
 
        openpgp_crt_verify_self.restype = _error_code
796
 
 
797
 
        openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit
798
 
        openpgp_crt_deinit.argtypes = [openpgp_crt_t]
799
 
        openpgp_crt_deinit.restype = None
800
 
 
801
 
        openpgp_crt_get_fingerprint = (
802
 
            _library.gnutls_openpgp_crt_get_fingerprint)
803
 
        openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,
804
 
                                                ctypes.c_void_p,
805
 
                                                ctypes.POINTER(
806
 
                                                    ctypes.c_size_t)]
807
 
        openpgp_crt_get_fingerprint.restype = _error_code
808
 
 
809
 
    if check_version(b"3.6.4"):
810
 
        certificate_type_get2 = _library.gnutls_certificate_type_get2
811
 
        certificate_type_get2.argtypes = [session_t, ctypes.c_int]
812
 
        certificate_type_get2.restype = _error_code
813
 
 
814
 
    # Remove non-public functions
815
 
    del _error_code, _retry_on_error
816
 
 
817
 
 
818
 
def call_pipe(connection,       # : multiprocessing.Connection
819
 
              func, *args, **kwargs):
820
 
    """This function is meant to be called by multiprocessing.Process
821
 
 
822
 
    This function runs func(*args, **kwargs), and writes the resulting
823
 
    return value on the provided multiprocessing.Connection.
824
 
    """
825
 
    connection.send(func(*args, **kwargs))
826
 
    connection.close()
827
 
 
828
 
 
829
 
class Client:
 
30
 
 
31
import logging
 
32
import logging.handlers
 
33
 
 
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
 
35
 
 
36
logger = logging.Logger('mandos')
 
37
logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))
 
38
 
 
39
# This variable is used to optionally bind to a specified interface.
 
40
# It is a global variable to fit in with the other variables from the
 
41
# Avahi server example code.
 
42
serviceInterface = avahi.IF_UNSPEC
 
43
# From the Avahi server example code:
 
44
serviceName = "Mandos"
 
45
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
46
servicePort = None                      # Not known at startup
 
47
serviceTXT = []                         # TXT record for the service
 
48
domain = ""                  # Domain to publish on, default to .local
 
49
host = ""          # Host to publish records for, default to localhost
 
50
group = None #our entry group
 
51
rename_count = 12       # Counter so we only rename after collisions a
 
52
                        # sensible number of times
 
53
# End of Avahi example code
 
54
 
 
55
 
 
56
class Client(object):
830
57
    """A representation of a client host served by this server.
831
 
 
832
58
    Attributes:
833
 
    approved:   bool(); 'None' if not yet approved/disapproved
834
 
    approval_delay: datetime.timedelta(); Time to wait for approval
835
 
    approval_duration: datetime.timedelta(); Duration of one approval
836
 
    checker: multiprocessing.Process(); a running checker process used
837
 
             to see if the client lives. 'None' if no process is
838
 
             running.
839
 
    checker_callback_tag: a GLib event source tag, or None
840
 
    checker_command: string; External command which is run to check
841
 
                     if client lives.  %() expansions are done at
 
59
    name:      string; from the config file, used in log messages
 
60
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
61
                 uniquely identify the client
 
62
    secret:    bytestring; sent verbatim (over TLS) to client
 
63
    fqdn:      string (FQDN); available for use by the checker command
 
64
    created:   datetime.datetime()
 
65
    last_seen: datetime.datetime() or None if not yet seen
 
66
    timeout:   datetime.timedelta(); How long from last_seen until
 
67
                                     this client is invalid
 
68
    interval:  datetime.timedelta(); How often to start a new checker
 
69
    stop_hook: If set, called by stop() as stop_hook(self)
 
70
    checker:   subprocess.Popen(); a running checker process used
 
71
                                   to see if the client lives.
 
72
                                   Is None if no process is running.
 
73
    checker_initiator_tag: a gobject event source tag, or None
 
74
    stop_initiator_tag:    - '' -
 
75
    checker_callback_tag:  - '' -
 
76
    checker_command: string; External command which is run to check if
 
77
                     client lives.  %()s expansions are done at
842
78
                     runtime with vars(self) as dict, so that for
843
79
                     instance %(name)s can be used in the command.
844
 
    checker_initiator_tag: a GLib event source tag, or None
845
 
    created:    datetime.datetime(); (UTC) object creation
846
 
    client_structure: Object describing what attributes a client has
847
 
                      and is used for storing the client at exit
848
 
    current_checker_command: string; current running checker_command
849
 
    disable_initiator_tag: a GLib event source tag, or None
850
 
    enabled:    bool()
851
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
852
 
                 uniquely identify an OpenPGP client
853
 
    key_id: string (64 hexadecimal digits); used to uniquely identify
854
 
            a client using raw public keys
855
 
    host:       string; available for use by the checker command
856
 
    interval:   datetime.timedelta(); How often to start a new checker
857
 
    last_approval_request: datetime.datetime(); (UTC) or None
858
 
    last_checked_ok: datetime.datetime(); (UTC) or None
859
 
    last_checker_status: integer between 0 and 255 reflecting exit
860
 
                         status of last checker. -1 reflects crashed
861
 
                         checker, -2 means no checker completed yet.
862
 
    last_checker_signal: The signal which killed the last checker, if
863
 
                         last_checker_status is -1
864
 
    last_enabled: datetime.datetime(); (UTC) or None
865
 
    name:       string; from the config file, used in log messages and
866
 
                        D-Bus identifiers
867
 
    secret:     bytestring; sent verbatim (over TLS) to client
868
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
869
 
                                      until this client is disabled
870
 
    extended_timeout:   extra long timeout when secret has been sent
871
 
    runtime_expansions: Allowed attributes for runtime expansion.
872
 
    expires:    datetime.datetime(); time (UTC) when a client will be
873
 
                disabled, or None
874
 
    server_settings: The server_settings dict from main()
 
80
    Private attibutes:
 
81
    _timeout: Real variable for 'timeout'
 
82
    _interval: Real variable for 'interval'
 
83
    _timeout_milliseconds: Used by gobject.timeout_add()
 
84
    _interval_milliseconds: - '' -
875
85
    """
876
 
 
877
 
    runtime_expansions = ("approval_delay", "approval_duration",
878
 
                          "created", "enabled", "expires", "key_id",
879
 
                          "fingerprint", "host", "interval",
880
 
                          "last_approval_request", "last_checked_ok",
881
 
                          "last_enabled", "name", "timeout")
882
 
    client_defaults = {
883
 
        "timeout": "PT5M",
884
 
        "extended_timeout": "PT15M",
885
 
        "interval": "PT2M",
886
 
        "checker": "fping -q -- %%(host)s",
887
 
        "host": "",
888
 
        "approval_delay": "PT0S",
889
 
        "approval_duration": "PT1S",
890
 
        "approved_by_default": "True",
891
 
        "enabled": "True",
892
 
    }
893
 
 
894
 
    @staticmethod
895
 
    def config_parser(config):
896
 
        """Construct a new dict of client settings of this form:
897
 
        { client_name: {setting_name: value, ...}, ...}
898
 
        with exceptions for any special settings as defined above.
899
 
        NOTE: Must be a pure function. Must return the same result
900
 
        value given the same arguments.
901
 
        """
902
 
        settings = {}
903
 
        for client_name in config.sections():
904
 
            section = dict(config.items(client_name))
905
 
            client = settings[client_name] = {}
906
 
 
907
 
            client["host"] = section["host"]
908
 
            # Reformat values from string types to Python types
909
 
            client["approved_by_default"] = config.getboolean(
910
 
                client_name, "approved_by_default")
911
 
            client["enabled"] = config.getboolean(client_name,
912
 
                                                  "enabled")
913
 
 
914
 
            # Uppercase and remove spaces from key_id and fingerprint
915
 
            # for later comparison purposes with return value from the
916
 
            # key_id() and fingerprint() functions
917
 
            client["key_id"] = (section.get("key_id", "").upper()
918
 
                                .replace(" ", ""))
919
 
            client["fingerprint"] = (section["fingerprint"].upper()
920
 
                                     .replace(" ", ""))
921
 
            if "secret" in section:
922
 
                client["secret"] = codecs.decode(section["secret"]
923
 
                                                 .encode("utf-8"),
924
 
                                                 "base64")
925
 
            elif "secfile" in section:
926
 
                with open(os.path.expanduser(os.path.expandvars
927
 
                                             (section["secfile"])),
928
 
                          "rb") as secfile:
929
 
                    client["secret"] = secfile.read()
930
 
            else:
931
 
                raise TypeError("No secret or secfile for section {}"
932
 
                                .format(section))
933
 
            client["timeout"] = string_to_delta(section["timeout"])
934
 
            client["extended_timeout"] = string_to_delta(
935
 
                section["extended_timeout"])
936
 
            client["interval"] = string_to_delta(section["interval"])
937
 
            client["approval_delay"] = string_to_delta(
938
 
                section["approval_delay"])
939
 
            client["approval_duration"] = string_to_delta(
940
 
                section["approval_duration"])
941
 
            client["checker_command"] = section["checker"]
942
 
            client["last_approval_request"] = None
943
 
            client["last_checked_ok"] = None
944
 
            client["last_checker_status"] = -2
945
 
 
946
 
        return settings
947
 
 
948
 
    def __init__(self, settings, name=None, server_settings=None):
 
86
    def _set_timeout(self, timeout):
 
87
        "Setter function for 'timeout' attribute"
 
88
        self._timeout = timeout
 
89
        self._timeout_milliseconds = ((self.timeout.days
 
90
                                       * 24 * 60 * 60 * 1000)
 
91
                                      + (self.timeout.seconds * 1000)
 
92
                                      + (self.timeout.microseconds
 
93
                                         // 1000))
 
94
    timeout = property(lambda self: self._timeout,
 
95
                       _set_timeout)
 
96
    del _set_timeout
 
97
    def _set_interval(self, interval):
 
98
        "Setter function for 'interval' attribute"
 
99
        self._interval = interval
 
100
        self._interval_milliseconds = ((self.interval.days
 
101
                                        * 24 * 60 * 60 * 1000)
 
102
                                       + (self.interval.seconds
 
103
                                          * 1000)
 
104
                                       + (self.interval.microseconds
 
105
                                          // 1000))
 
106
    interval = property(lambda self: self._interval,
 
107
                        _set_interval)
 
108
    del _set_interval
 
109
    def __init__(self, name=None, options=None, stop_hook=None,
 
110
                 fingerprint=None, secret=None, secfile=None, fqdn=None,
 
111
                 timeout=None, interval=-1, checker=None):
949
112
        self.name = name
950
 
        if server_settings is None:
951
 
            server_settings = {}
952
 
        self.server_settings = server_settings
953
 
        # adding all client settings
954
 
        for setting, value in settings.items():
955
 
            setattr(self, setting, value)
956
 
 
957
 
        if self.enabled:
958
 
            if not hasattr(self, "last_enabled"):
959
 
                self.last_enabled = datetime.datetime.utcnow()
960
 
            if not hasattr(self, "expires"):
961
 
                self.expires = (datetime.datetime.utcnow()
962
 
                                + self.timeout)
963
 
        else:
964
 
            self.last_enabled = None
965
 
            self.expires = None
966
 
 
967
 
        logger.debug("Creating client %r", self.name)
968
 
        logger.debug("  Key ID: %s", self.key_id)
969
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
970
 
        self.created = settings.get("created",
971
 
                                    datetime.datetime.utcnow())
972
 
 
973
 
        # attributes specific for this server instance
 
113
        # Uppercase and remove spaces from fingerprint
 
114
        # for later comparison purposes with return value of
 
115
        # the fingerprint() function
 
116
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
117
        if secret:
 
118
            self.secret = secret.decode(u"base64")
 
119
        elif secfile:
 
120
            sf = open(secfile)
 
121
            self.secret = sf.read()
 
122
            sf.close()
 
123
        else:
 
124
            raise RuntimeError(u"No secret or secfile for client %s"
 
125
                               % self.name)
 
126
        self.fqdn = fqdn                # string
 
127
        self.created = datetime.datetime.now()
 
128
        self.last_seen = None
 
129
        if timeout is None:
 
130
            timeout = options.timeout
 
131
        self.timeout = timeout
 
132
        if interval == -1:
 
133
            interval = options.interval
 
134
        else:
 
135
            interval = string_to_delta(interval)
 
136
        self.interval = interval
 
137
        self.stop_hook = stop_hook
974
138
        self.checker = None
975
139
        self.checker_initiator_tag = None
976
 
        self.disable_initiator_tag = None
 
140
        self.stop_initiator_tag = None
977
141
        self.checker_callback_tag = None
978
 
        self.current_checker_command = None
979
 
        self.approved = None
980
 
        self.approvals_pending = 0
981
 
        self.changedstate = multiprocessing_manager.Condition(
982
 
            multiprocessing_manager.Lock())
983
 
        self.client_structure = [attr
984
 
                                 for attr in self.__dict__.keys()
985
 
                                 if not attr.startswith("_")]
986
 
        self.client_structure.append("client_structure")
987
 
 
988
 
        for name, t in inspect.getmembers(
989
 
                type(self), lambda obj: isinstance(obj, property)):
990
 
            if not name.startswith("_"):
991
 
                self.client_structure.append(name)
992
 
 
993
 
    # Send notice to process children that client state has changed
994
 
    def send_changedstate(self):
995
 
        with self.changedstate:
996
 
            self.changedstate.notify_all()
997
 
 
998
 
    def enable(self):
999
 
        """Start this client's checker and timeout hooks"""
1000
 
        if getattr(self, "enabled", False):
1001
 
            # Already enabled
1002
 
            return
1003
 
        self.expires = datetime.datetime.utcnow() + self.timeout
1004
 
        self.enabled = True
1005
 
        self.last_enabled = datetime.datetime.utcnow()
1006
 
        self.init_checker()
1007
 
        self.send_changedstate()
1008
 
 
1009
 
    def disable(self, quiet=True):
1010
 
        """Disable this client."""
1011
 
        if not getattr(self, "enabled", False):
1012
 
            return False
1013
 
        if not quiet:
1014
 
            logger.info("Disabling client %s", self.name)
1015
 
        if getattr(self, "disable_initiator_tag", None) is not None:
1016
 
            GLib.source_remove(self.disable_initiator_tag)
1017
 
            self.disable_initiator_tag = None
1018
 
        self.expires = None
1019
 
        if getattr(self, "checker_initiator_tag", None) is not None:
1020
 
            GLib.source_remove(self.checker_initiator_tag)
1021
 
            self.checker_initiator_tag = None
1022
 
        self.stop_checker()
1023
 
        self.enabled = False
1024
 
        if not quiet:
1025
 
            self.send_changedstate()
1026
 
        # Do not run this again if called by a GLib.timeout_add
1027
 
        return False
1028
 
 
1029
 
    def __del__(self):
1030
 
        self.disable()
1031
 
 
1032
 
    def init_checker(self):
 
142
        self.check_command = checker
 
143
    def start(self):
 
144
        """Start this clients checker and timeout hooks"""
1033
145
        # Schedule a new checker to be started an 'interval' from now,
1034
146
        # and every interval from then on.
1035
 
        if self.checker_initiator_tag is not None:
1036
 
            GLib.source_remove(self.checker_initiator_tag)
1037
 
        self.checker_initiator_tag = GLib.timeout_add(
1038
 
            int(self.interval.total_seconds() * 1000),
1039
 
            self.start_checker)
1040
 
        # Schedule a disable() when 'timeout' has passed
1041
 
        if self.disable_initiator_tag is not None:
1042
 
            GLib.source_remove(self.disable_initiator_tag)
1043
 
        self.disable_initiator_tag = GLib.timeout_add(
1044
 
            int(self.timeout.total_seconds() * 1000), self.disable)
 
147
        self.checker_initiator_tag = gobject.timeout_add\
 
148
                                     (self._interval_milliseconds,
 
149
                                      self.start_checker)
1045
150
        # Also start a new checker *right now*.
1046
151
        self.start_checker()
1047
 
 
1048
 
    def checker_callback(self, source, condition, connection,
1049
 
                         command):
 
152
        # Schedule a stop() when 'timeout' has passed
 
153
        self.stop_initiator_tag = gobject.timeout_add\
 
154
                                  (self._timeout_milliseconds,
 
155
                                   self.stop)
 
156
    def stop(self):
 
157
        """Stop this client.
 
158
        The possibility that this client might be restarted is left
 
159
        open, but not currently used."""
 
160
        logger.debug(u"Stopping client %s", self.name)
 
161
        self.secret = None
 
162
        if self.stop_initiator_tag:
 
163
            gobject.source_remove(self.stop_initiator_tag)
 
164
            self.stop_initiator_tag = None
 
165
        if self.checker_initiator_tag:
 
166
            gobject.source_remove(self.checker_initiator_tag)
 
167
            self.checker_initiator_tag = None
 
168
        self.stop_checker()
 
169
        if self.stop_hook:
 
170
            self.stop_hook(self)
 
171
        # Do not run this again if called by a gobject.timeout_add
 
172
        return False
 
173
    def __del__(self):
 
174
        # Some code duplication here and in stop()
 
175
        if hasattr(self, "stop_initiator_tag") \
 
176
               and self.stop_initiator_tag:
 
177
            gobject.source_remove(self.stop_initiator_tag)
 
178
            self.stop_initiator_tag = None
 
179
        if hasattr(self, "checker_initiator_tag") \
 
180
               and self.checker_initiator_tag:
 
181
            gobject.source_remove(self.checker_initiator_tag)
 
182
            self.checker_initiator_tag = None
 
183
        self.stop_checker()
 
184
    def checker_callback(self, pid, condition):
1050
185
        """The checker has completed, so take appropriate actions."""
1051
 
        # Read return code from connection (see call_pipe)
1052
 
        returncode = connection.recv()
1053
 
        connection.close()
1054
 
        if self.checker is not None:
1055
 
            self.checker.join()
1056
 
        self.checker_callback_tag = None
1057
 
        self.checker = None
1058
 
 
1059
 
        if returncode >= 0:
1060
 
            self.last_checker_status = returncode
1061
 
            self.last_checker_signal = None
1062
 
            if self.last_checker_status == 0:
1063
 
                logger.info("Checker for %(name)s succeeded",
1064
 
                            vars(self))
1065
 
                self.checked_ok()
1066
 
            else:
1067
 
                logger.info("Checker for %(name)s failed", vars(self))
1068
 
        else:
1069
 
            self.last_checker_status = -1
1070
 
            self.last_checker_signal = -returncode
1071
 
            logger.warning("Checker for %(name)s crashed?",
 
186
        now = datetime.datetime.now()
 
187
        if os.WIFEXITED(condition) \
 
188
               and (os.WEXITSTATUS(condition) == 0):
 
189
            logger.debug(u"Checker for %(name)s succeeded",
 
190
                         vars(self))
 
191
            self.last_seen = now
 
192
            gobject.source_remove(self.stop_initiator_tag)
 
193
            self.stop_initiator_tag = gobject.timeout_add\
 
194
                                      (self._timeout_milliseconds,
 
195
                                       self.stop)
 
196
        if not os.WIFEXITED(condition):
 
197
            logger.warning(u"Checker for %(name)s crashed?",
1072
198
                           vars(self))
1073
 
        return False
1074
 
 
1075
 
    def checked_ok(self):
1076
 
        """Assert that the client has been seen, alive and well."""
1077
 
        self.last_checked_ok = datetime.datetime.utcnow()
1078
 
        self.last_checker_status = 0
1079
 
        self.last_checker_signal = None
1080
 
        self.bump_timeout()
1081
 
 
1082
 
    def bump_timeout(self, timeout=None):
1083
 
        """Bump up the timeout for this client."""
1084
 
        if timeout is None:
1085
 
            timeout = self.timeout
1086
 
        if self.disable_initiator_tag is not None:
1087
 
            GLib.source_remove(self.disable_initiator_tag)
1088
 
            self.disable_initiator_tag = None
1089
 
        if getattr(self, "enabled", False):
1090
 
            self.disable_initiator_tag = GLib.timeout_add(
1091
 
                int(timeout.total_seconds() * 1000), self.disable)
1092
 
            self.expires = datetime.datetime.utcnow() + timeout
1093
 
 
1094
 
    def need_approval(self):
1095
 
        self.last_approval_request = datetime.datetime.utcnow()
1096
 
 
 
199
        else:
 
200
            logger.debug(u"Checker for %(name)s failed",
 
201
                         vars(self))
 
202
            self.checker = None
 
203
        self.checker_callback_tag = None
1097
204
    def start_checker(self):
1098
205
        """Start a new checker subprocess if one is not running.
1099
 
 
1100
206
        If a checker already exists, leave it running and do
1101
207
        nothing."""
1102
 
        # The reason for not killing a running checker is that if we
1103
 
        # did that, and if a checker (for some reason) started running
1104
 
        # slowly and taking more than 'interval' time, then the client
1105
 
        # would inevitably timeout, since no checker would get a
1106
 
        # chance to run to completion.  If we instead leave running
1107
 
        # checkers alone, the checker would have to take more time
1108
 
        # than 'timeout' for the client to be disabled, which is as it
1109
 
        # should be.
1110
 
 
1111
 
        if self.checker is not None and not self.checker.is_alive():
1112
 
            logger.warning("Checker was not alive; joining")
1113
 
            self.checker.join()
1114
 
            self.checker = None
1115
 
        # Start a new checker if needed
1116
208
        if self.checker is None:
1117
 
            # Escape attributes for the shell
1118
 
            escaped_attrs = {
1119
 
                attr: re.escape(str(getattr(self, attr)))
1120
 
                for attr in self.runtime_expansions}
1121
 
            try:
1122
 
                command = self.checker_command % escaped_attrs
1123
 
            except TypeError as error:
1124
 
                logger.error('Could not format string "%s"',
1125
 
                             self.checker_command,
1126
 
                             exc_info=error)
1127
 
                return True     # Try again later
1128
 
            self.current_checker_command = command
1129
 
            logger.info("Starting checker %r for %s", command,
1130
 
                        self.name)
1131
 
            # We don't need to redirect stdout and stderr, since
1132
 
            # in normal mode, that is already done by daemon(),
1133
 
            # and in debug mode we don't want to.  (Stdin is
1134
 
            # always replaced by /dev/null.)
1135
 
            # The exception is when not debugging but nevertheless
1136
 
            # running in the foreground; use the previously
1137
 
            # created wnull.
1138
 
            popen_args = {"close_fds": True,
1139
 
                          "shell": True,
1140
 
                          "cwd": "/"}
1141
 
            if (not self.server_settings["debug"]
1142
 
                and self.server_settings["foreground"]):
1143
 
                popen_args.update({"stdout": wnull,
1144
 
                                   "stderr": wnull})
1145
 
            pipe = multiprocessing.Pipe(duplex=False)
1146
 
            self.checker = multiprocessing.Process(
1147
 
                target=call_pipe,
1148
 
                args=(pipe[1], subprocess.call, command),
1149
 
                kwargs=popen_args)
1150
 
            self.checker.start()
1151
 
            self.checker_callback_tag = GLib.io_add_watch(
1152
 
                GLib.IOChannel.unix_new(pipe[0].fileno()),
1153
 
                GLib.PRIORITY_DEFAULT, GLib.IO_IN,
1154
 
                self.checker_callback, pipe[0], command)
1155
 
        # Re-run this periodically if run by GLib.timeout_add
 
209
            logger.debug(u"Starting checker for %s",
 
210
                         self.name)
 
211
            try:
 
212
                command = self.check_command % self.fqdn
 
213
            except TypeError:
 
214
                escaped_attrs = dict((key, re.escape(str(val)))
 
215
                                     for key, val in
 
216
                                     vars(self).iteritems())
 
217
                try:
 
218
                    command = self.check_command % escaped_attrs
 
219
                except TypeError, error:
 
220
                    logger.critical(u'Could not format string "%s": %s',
 
221
                                    self.check_command, error)
 
222
                    return True # Try again later
 
223
            try:
 
224
                self.checker = subprocess.\
 
225
                               Popen(command,
 
226
                                     stdout=subprocess.PIPE,
 
227
                                     close_fds=True, shell=True,
 
228
                                     cwd="/")
 
229
                self.checker_callback_tag = gobject.\
 
230
                                            child_watch_add(self.checker.pid,
 
231
                                                            self.\
 
232
                                                            checker_callback)
 
233
            except subprocess.OSError, error:
 
234
                logger.error(u"Failed to start subprocess: %s",
 
235
                             error)
 
236
        # Re-run this periodically if run by gobject.timeout_add
1156
237
        return True
1157
 
 
1158
238
    def stop_checker(self):
1159
239
        """Force the checker process, if any, to stop."""
1160
 
        if self.checker_callback_tag:
1161
 
            GLib.source_remove(self.checker_callback_tag)
1162
 
            self.checker_callback_tag = None
1163
 
        if getattr(self, "checker", None) is None:
 
240
        if not hasattr(self, "checker") or self.checker is None:
1164
241
            return
1165
 
        logger.debug("Stopping checker for %(name)s", vars(self))
1166
 
        self.checker.terminate()
 
242
        gobject.source_remove(self.checker_callback_tag)
 
243
        self.checker_callback_tag = None
 
244
        os.kill(self.checker.pid, signal.SIGTERM)
 
245
        if self.checker.poll() is None:
 
246
            os.kill(self.checker.pid, signal.SIGKILL)
1167
247
        self.checker = None
1168
 
 
1169
 
 
1170
 
def dbus_service_property(dbus_interface,
1171
 
                          signature="v",
1172
 
                          access="readwrite",
1173
 
                          byte_arrays=False):
1174
 
    """Decorators for marking methods of a DBusObjectWithProperties to
1175
 
    become properties on the D-Bus.
1176
 
 
1177
 
    The decorated method will be called with no arguments by "Get"
1178
 
    and with one argument by "Set".
1179
 
 
1180
 
    The parameters, where they are supported, are the same as
1181
 
    dbus.service.method, except there is only "signature", since the
1182
 
    type from Get() and the type sent to Set() is the same.
1183
 
    """
1184
 
    # Encoding deeply encoded byte arrays is not supported yet by the
1185
 
    # "Set" method, so we fail early here:
1186
 
    if byte_arrays and signature != "ay":
1187
 
        raise ValueError("Byte arrays not supported for non-'ay'"
1188
 
                         " signature {!r}".format(signature))
1189
 
 
1190
 
    def decorator(func):
1191
 
        func._dbus_is_property = True
1192
 
        func._dbus_interface = dbus_interface
1193
 
        func._dbus_signature = signature
1194
 
        func._dbus_access = access
1195
 
        func._dbus_name = func.__name__
1196
 
        if func._dbus_name.endswith("_dbus_property"):
1197
 
            func._dbus_name = func._dbus_name[:-14]
1198
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays}
1199
 
        return func
1200
 
 
1201
 
    return decorator
1202
 
 
1203
 
 
1204
 
def dbus_interface_annotations(dbus_interface):
1205
 
    """Decorator for marking functions returning interface annotations
1206
 
 
1207
 
    Usage:
1208
 
 
1209
 
    @dbus_interface_annotations("org.example.Interface")
1210
 
    def _foo(self):  # Function name does not matter
1211
 
        return {"org.freedesktop.DBus.Deprecated": "true",
1212
 
                "org.freedesktop.DBus.Property.EmitsChangedSignal":
1213
 
                    "false"}
1214
 
    """
1215
 
 
1216
 
    def decorator(func):
1217
 
        func._dbus_is_interface = True
1218
 
        func._dbus_interface = dbus_interface
1219
 
        func._dbus_name = dbus_interface
1220
 
        return func
1221
 
 
1222
 
    return decorator
1223
 
 
1224
 
 
1225
 
def dbus_annotations(annotations):
1226
 
    """Decorator to annotate D-Bus methods, signals or properties
1227
 
    Usage:
1228
 
 
1229
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true",
1230
 
                       "org.freedesktop.DBus.Property."
1231
 
                       "EmitsChangedSignal": "false"})
1232
 
    @dbus_service_property("org.example.Interface", signature="b",
1233
 
                           access="r")
1234
 
    def Property_dbus_property(self):
1235
 
        return dbus.Boolean(False)
1236
 
 
1237
 
    See also the DBusObjectWithAnnotations class.
1238
 
    """
1239
 
 
1240
 
    def decorator(func):
1241
 
        func._dbus_annotations = annotations
1242
 
        return func
1243
 
 
1244
 
    return decorator
1245
 
 
1246
 
 
1247
 
class DBusPropertyException(dbus.exceptions.DBusException):
1248
 
    """A base class for D-Bus property-related exceptions
1249
 
    """
1250
 
    pass
1251
 
 
1252
 
 
1253
 
class DBusPropertyAccessException(DBusPropertyException):
1254
 
    """A property's access permissions disallows an operation.
1255
 
    """
1256
 
    pass
1257
 
 
1258
 
 
1259
 
class DBusPropertyNotFound(DBusPropertyException):
1260
 
    """An attempt was made to access a non-existing property.
1261
 
    """
1262
 
    pass
1263
 
 
1264
 
 
1265
 
class DBusObjectWithAnnotations(dbus.service.Object):
1266
 
    """A D-Bus object with annotations.
1267
 
 
1268
 
    Classes inheriting from this can use the dbus_annotations
1269
 
    decorator to add annotations to methods or signals.
1270
 
    """
1271
 
 
1272
 
    @staticmethod
1273
 
    def _is_dbus_thing(thing):
1274
 
        """Returns a function testing if an attribute is a D-Bus thing
1275
 
 
1276
 
        If called like _is_dbus_thing("method") it returns a function
1277
 
        suitable for use as predicate to inspect.getmembers().
1278
 
        """
1279
 
        return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),
1280
 
                                   False)
1281
 
 
1282
 
    def _get_all_dbus_things(self, thing):
1283
 
        """Returns a generator of (name, attribute) pairs
1284
 
        """
1285
 
        return ((getattr(athing.__get__(self), "_dbus_name", name),
1286
 
                 athing.__get__(self))
1287
 
                for cls in self.__class__.__mro__
1288
 
                for name, athing in
1289
 
                inspect.getmembers(cls, self._is_dbus_thing(thing)))
1290
 
 
1291
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1292
 
                         out_signature="s",
1293
 
                         path_keyword='object_path',
1294
 
                         connection_keyword='connection')
1295
 
    def Introspect(self, object_path, connection):
1296
 
        """Overloading of standard D-Bus method.
1297
 
 
1298
 
        Inserts annotation tags on methods and signals.
1299
 
        """
1300
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
1301
 
                                                   connection)
1302
 
        try:
1303
 
            document = xml.dom.minidom.parseString(xmlstring)
1304
 
 
1305
 
            for if_tag in document.getElementsByTagName("interface"):
1306
 
                # Add annotation tags
1307
 
                for typ in ("method", "signal"):
1308
 
                    for tag in if_tag.getElementsByTagName(typ):
1309
 
                        annots = dict()
1310
 
                        for name, prop in (self.
1311
 
                                           _get_all_dbus_things(typ)):
1312
 
                            if (name == tag.getAttribute("name")
1313
 
                                and prop._dbus_interface
1314
 
                                == if_tag.getAttribute("name")):
1315
 
                                annots.update(getattr(
1316
 
                                    prop, "_dbus_annotations", {}))
1317
 
                        for name, value in annots.items():
1318
 
                            ann_tag = document.createElement(
1319
 
                                "annotation")
1320
 
                            ann_tag.setAttribute("name", name)
1321
 
                            ann_tag.setAttribute("value", value)
1322
 
                            tag.appendChild(ann_tag)
1323
 
                # Add interface annotation tags
1324
 
                for annotation, value in dict(
1325
 
                    itertools.chain.from_iterable(
1326
 
                        annotations().items()
1327
 
                        for name, annotations
1328
 
                        in self._get_all_dbus_things("interface")
1329
 
                        if name == if_tag.getAttribute("name")
1330
 
                        )).items():
1331
 
                    ann_tag = document.createElement("annotation")
1332
 
                    ann_tag.setAttribute("name", annotation)
1333
 
                    ann_tag.setAttribute("value", value)
1334
 
                    if_tag.appendChild(ann_tag)
1335
 
                # Fix argument name for the Introspect method itself
1336
 
                if (if_tag.getAttribute("name")
1337
 
                    == dbus.INTROSPECTABLE_IFACE):
1338
 
                    for cn in if_tag.getElementsByTagName("method"):
1339
 
                        if cn.getAttribute("name") == "Introspect":
1340
 
                            for arg in cn.getElementsByTagName("arg"):
1341
 
                                if (arg.getAttribute("direction")
1342
 
                                    == "out"):
1343
 
                                    arg.setAttribute("name",
1344
 
                                                     "xml_data")
1345
 
            xmlstring = document.toxml("utf-8")
1346
 
            document.unlink()
1347
 
        except (AttributeError, xml.dom.DOMException,
1348
 
                xml.parsers.expat.ExpatError) as error:
1349
 
            logger.error("Failed to override Introspection method",
1350
 
                         exc_info=error)
1351
 
        return xmlstring
1352
 
 
1353
 
 
1354
 
class DBusObjectWithProperties(DBusObjectWithAnnotations):
1355
 
    """A D-Bus object with properties.
1356
 
 
1357
 
    Classes inheriting from this can use the dbus_service_property
1358
 
    decorator to expose methods as D-Bus properties.  It exposes the
1359
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
1360
 
    """
1361
 
 
1362
 
    def _get_dbus_property(self, interface_name, property_name):
1363
 
        """Returns a bound method if one exists which is a D-Bus
1364
 
        property with the specified name and interface.
1365
 
        """
1366
 
        for cls in self.__class__.__mro__:
1367
 
            for name, value in inspect.getmembers(
1368
 
                    cls, self._is_dbus_thing("property")):
1369
 
                if (value._dbus_name == property_name
1370
 
                    and value._dbus_interface == interface_name):
1371
 
                    return value.__get__(self)
1372
 
 
1373
 
        # No such property
1374
 
        raise DBusPropertyNotFound("{}:{}.{}".format(
1375
 
            self.dbus_object_path, interface_name, property_name))
1376
 
 
1377
 
    @classmethod
1378
 
    def _get_all_interface_names(cls):
1379
 
        """Get a sequence of all interfaces supported by an object"""
1380
 
        return (name for name in set(getattr(getattr(x, attr),
1381
 
                                             "_dbus_interface", None)
1382
 
                                     for x in (inspect.getmro(cls))
1383
 
                                     for attr in dir(x))
1384
 
                if name is not None)
1385
 
 
1386
 
    @dbus.service.method(dbus.PROPERTIES_IFACE,
1387
 
                         in_signature="ss",
1388
 
                         out_signature="v")
1389
 
    def Get(self, interface_name, property_name):
1390
 
        """Standard D-Bus property Get() method, see D-Bus standard.
1391
 
        """
1392
 
        prop = self._get_dbus_property(interface_name, property_name)
1393
 
        if prop._dbus_access == "write":
1394
 
            raise DBusPropertyAccessException(property_name)
1395
 
        value = prop()
1396
 
        if not hasattr(value, "variant_level"):
1397
 
            return value
1398
 
        return type(value)(value, variant_level=value.variant_level+1)
1399
 
 
1400
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
1401
 
    def Set(self, interface_name, property_name, value):
1402
 
        """Standard D-Bus property Set() method, see D-Bus standard.
1403
 
        """
1404
 
        prop = self._get_dbus_property(interface_name, property_name)
1405
 
        if prop._dbus_access == "read":
1406
 
            raise DBusPropertyAccessException(property_name)
1407
 
        if prop._dbus_get_args_options["byte_arrays"]:
1408
 
            # The byte_arrays option is not supported yet on
1409
 
            # signatures other than "ay".
1410
 
            if prop._dbus_signature != "ay":
1411
 
                raise ValueError("Byte arrays not supported for non-"
1412
 
                                 "'ay' signature {!r}"
1413
 
                                 .format(prop._dbus_signature))
1414
 
            value = dbus.ByteArray(bytes(value))
1415
 
        prop(value)
1416
 
 
1417
 
    @dbus.service.method(dbus.PROPERTIES_IFACE,
1418
 
                         in_signature="s",
1419
 
                         out_signature="a{sv}")
1420
 
    def GetAll(self, interface_name):
1421
 
        """Standard D-Bus property GetAll() method, see D-Bus
1422
 
        standard.
1423
 
 
1424
 
        Note: Will not include properties with access="write".
1425
 
        """
1426
 
        properties = {}
1427
 
        for name, prop in self._get_all_dbus_things("property"):
1428
 
            if (interface_name
1429
 
                and interface_name != prop._dbus_interface):
1430
 
                # Interface non-empty but did not match
1431
 
                continue
1432
 
            # Ignore write-only properties
1433
 
            if prop._dbus_access == "write":
1434
 
                continue
1435
 
            value = prop()
1436
 
            if not hasattr(value, "variant_level"):
1437
 
                properties[name] = value
1438
 
                continue
1439
 
            properties[name] = type(value)(
1440
 
                value, variant_level=value.variant_level + 1)
1441
 
        return dbus.Dictionary(properties, signature="sv")
1442
 
 
1443
 
    @dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")
1444
 
    def PropertiesChanged(self, interface_name, changed_properties,
1445
 
                          invalidated_properties):
1446
 
        """Standard D-Bus PropertiesChanged() signal, see D-Bus
1447
 
        standard.
1448
 
        """
1449
 
        pass
1450
 
 
1451
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1452
 
                         out_signature="s",
1453
 
                         path_keyword='object_path',
1454
 
                         connection_keyword='connection')
1455
 
    def Introspect(self, object_path, connection):
1456
 
        """Overloading of standard D-Bus method.
1457
 
 
1458
 
        Inserts property tags and interface annotation tags.
1459
 
        """
1460
 
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
1461
 
                                                         object_path,
1462
 
                                                         connection)
1463
 
        try:
1464
 
            document = xml.dom.minidom.parseString(xmlstring)
1465
 
 
1466
 
            def make_tag(document, name, prop):
1467
 
                e = document.createElement("property")
1468
 
                e.setAttribute("name", name)
1469
 
                e.setAttribute("type", prop._dbus_signature)
1470
 
                e.setAttribute("access", prop._dbus_access)
1471
 
                return e
1472
 
 
1473
 
            for if_tag in document.getElementsByTagName("interface"):
1474
 
                # Add property tags
1475
 
                for tag in (make_tag(document, name, prop)
1476
 
                            for name, prop
1477
 
                            in self._get_all_dbus_things("property")
1478
 
                            if prop._dbus_interface
1479
 
                            == if_tag.getAttribute("name")):
1480
 
                    if_tag.appendChild(tag)
1481
 
                # Add annotation tags for properties
1482
 
                for tag in if_tag.getElementsByTagName("property"):
1483
 
                    annots = dict()
1484
 
                    for name, prop in self._get_all_dbus_things(
1485
 
                            "property"):
1486
 
                        if (name == tag.getAttribute("name")
1487
 
                            and prop._dbus_interface
1488
 
                            == if_tag.getAttribute("name")):
1489
 
                            annots.update(getattr(
1490
 
                                prop, "_dbus_annotations", {}))
1491
 
                    for name, value in annots.items():
1492
 
                        ann_tag = document.createElement(
1493
 
                            "annotation")
1494
 
                        ann_tag.setAttribute("name", name)
1495
 
                        ann_tag.setAttribute("value", value)
1496
 
                        tag.appendChild(ann_tag)
1497
 
                # Add the names to the return values for the
1498
 
                # "org.freedesktop.DBus.Properties" methods
1499
 
                if (if_tag.getAttribute("name")
1500
 
                    == "org.freedesktop.DBus.Properties"):
1501
 
                    for cn in if_tag.getElementsByTagName("method"):
1502
 
                        if cn.getAttribute("name") == "Get":
1503
 
                            for arg in cn.getElementsByTagName("arg"):
1504
 
                                if (arg.getAttribute("direction")
1505
 
                                    == "out"):
1506
 
                                    arg.setAttribute("name", "value")
1507
 
                        elif cn.getAttribute("name") == "GetAll":
1508
 
                            for arg in cn.getElementsByTagName("arg"):
1509
 
                                if (arg.getAttribute("direction")
1510
 
                                    == "out"):
1511
 
                                    arg.setAttribute("name", "props")
1512
 
            xmlstring = document.toxml("utf-8")
1513
 
            document.unlink()
1514
 
        except (AttributeError, xml.dom.DOMException,
1515
 
                xml.parsers.expat.ExpatError) as error:
1516
 
            logger.error("Failed to override Introspection method",
1517
 
                         exc_info=error)
1518
 
        return xmlstring
1519
 
 
1520
 
 
1521
 
try:
1522
 
    dbus.OBJECT_MANAGER_IFACE
1523
 
except AttributeError:
1524
 
    dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"
1525
 
 
1526
 
 
1527
 
class DBusObjectWithObjectManager(DBusObjectWithAnnotations):
1528
 
    """A D-Bus object with an ObjectManager.
1529
 
 
1530
 
    Classes inheriting from this exposes the standard
1531
 
    GetManagedObjects call and the InterfacesAdded and
1532
 
    InterfacesRemoved signals on the standard
1533
 
    "org.freedesktop.DBus.ObjectManager" interface.
1534
 
 
1535
 
    Note: No signals are sent automatically; they must be sent
1536
 
    manually.
1537
 
    """
1538
 
    @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
1539
 
                         out_signature="a{oa{sa{sv}}}")
1540
 
    def GetManagedObjects(self):
1541
 
        """This function must be overridden"""
1542
 
        raise NotImplementedError()
1543
 
 
1544
 
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,
1545
 
                         signature="oa{sa{sv}}")
1546
 
    def InterfacesAdded(self, object_path, interfaces_and_properties):
1547
 
        pass
1548
 
 
1549
 
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature="oas")
1550
 
    def InterfacesRemoved(self, object_path, interfaces):
1551
 
        pass
1552
 
 
1553
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1554
 
                         out_signature="s",
1555
 
                         path_keyword='object_path',
1556
 
                         connection_keyword='connection')
1557
 
    def Introspect(self, object_path, connection):
1558
 
        """Overloading of standard D-Bus method.
1559
 
 
1560
 
        Override return argument name of GetManagedObjects to be
1561
 
        "objpath_interfaces_and_properties"
1562
 
        """
1563
 
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
1564
 
                                                         object_path,
1565
 
                                                         connection)
1566
 
        try:
1567
 
            document = xml.dom.minidom.parseString(xmlstring)
1568
 
 
1569
 
            for if_tag in document.getElementsByTagName("interface"):
1570
 
                # Fix argument name for the GetManagedObjects method
1571
 
                if (if_tag.getAttribute("name")
1572
 
                    == dbus.OBJECT_MANAGER_IFACE):
1573
 
                    for cn in if_tag.getElementsByTagName("method"):
1574
 
                        if (cn.getAttribute("name")
1575
 
                            == "GetManagedObjects"):
1576
 
                            for arg in cn.getElementsByTagName("arg"):
1577
 
                                if (arg.getAttribute("direction")
1578
 
                                    == "out"):
1579
 
                                    arg.setAttribute(
1580
 
                                        "name",
1581
 
                                        "objpath_interfaces"
1582
 
                                        "_and_properties")
1583
 
            xmlstring = document.toxml("utf-8")
1584
 
            document.unlink()
1585
 
        except (AttributeError, xml.dom.DOMException,
1586
 
                xml.parsers.expat.ExpatError) as error:
1587
 
            logger.error("Failed to override Introspection method",
1588
 
                         exc_info=error)
1589
 
        return xmlstring
1590
 
 
1591
 
 
1592
 
def datetime_to_dbus(dt, variant_level=0):
1593
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
1594
 
    if dt is None:
1595
 
        return dbus.String("", variant_level=variant_level)
1596
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
1597
 
 
1598
 
 
1599
 
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
1600
 
    """A class decorator; applied to a subclass of
1601
 
    dbus.service.Object, it will add alternate D-Bus attributes with
1602
 
    interface names according to the "alt_interface_names" mapping.
1603
 
    Usage:
1604
 
 
1605
 
    @alternate_dbus_interfaces({"org.example.Interface":
1606
 
                                    "net.example.AlternateInterface"})
1607
 
    class SampleDBusObject(dbus.service.Object):
1608
 
        @dbus.service.method("org.example.Interface")
1609
 
        def SampleDBusMethod():
1610
 
            pass
1611
 
 
1612
 
    The above "SampleDBusMethod" on "SampleDBusObject" will be
1613
 
    reachable via two interfaces: "org.example.Interface" and
1614
 
    "net.example.AlternateInterface", the latter of which will have
1615
 
    its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
1616
 
    "true", unless "deprecate" is passed with a False value.
1617
 
 
1618
 
    This works for methods and signals, and also for D-Bus properties
1619
 
    (from DBusObjectWithProperties) and interfaces (from the
1620
 
    dbus_interface_annotations decorator).
1621
 
    """
1622
 
 
1623
 
    def wrapper(cls):
1624
 
        for orig_interface_name, alt_interface_name in (
1625
 
                alt_interface_names.items()):
1626
 
            attr = {}
1627
 
            interface_names = set()
1628
 
            # Go though all attributes of the class
1629
 
            for attrname, attribute in inspect.getmembers(cls):
1630
 
                # Ignore non-D-Bus attributes, and D-Bus attributes
1631
 
                # with the wrong interface name
1632
 
                if (not hasattr(attribute, "_dbus_interface")
1633
 
                    or not attribute._dbus_interface.startswith(
1634
 
                        orig_interface_name)):
1635
 
                    continue
1636
 
                # Create an alternate D-Bus interface name based on
1637
 
                # the current name
1638
 
                alt_interface = attribute._dbus_interface.replace(
1639
 
                    orig_interface_name, alt_interface_name)
1640
 
                interface_names.add(alt_interface)
1641
 
                # Is this a D-Bus signal?
1642
 
                if getattr(attribute, "_dbus_is_signal", False):
1643
 
                    # Extract the original non-method undecorated
1644
 
                    # function by black magic
1645
 
                    if sys.version_info.major == 2:
1646
 
                        nonmethod_func = (dict(
1647
 
                            zip(attribute.func_code.co_freevars,
1648
 
                                attribute.__closure__))
1649
 
                                          ["func"].cell_contents)
1650
 
                    else:
1651
 
                        nonmethod_func = (dict(
1652
 
                            zip(attribute.__code__.co_freevars,
1653
 
                                attribute.__closure__))
1654
 
                                          ["func"].cell_contents)
1655
 
                    # Create a new, but exactly alike, function
1656
 
                    # object, and decorate it to be a new D-Bus signal
1657
 
                    # with the alternate D-Bus interface name
1658
 
                    new_function = copy_function(nonmethod_func)
1659
 
                    new_function = (dbus.service.signal(
1660
 
                        alt_interface,
1661
 
                        attribute._dbus_signature)(new_function))
1662
 
                    # Copy annotations, if any
1663
 
                    try:
1664
 
                        new_function._dbus_annotations = dict(
1665
 
                            attribute._dbus_annotations)
1666
 
                    except AttributeError:
1667
 
                        pass
1668
 
 
1669
 
                    # Define a creator of a function to call both the
1670
 
                    # original and alternate functions, so both the
1671
 
                    # original and alternate signals gets sent when
1672
 
                    # the function is called
1673
 
                    def fixscope(func1, func2):
1674
 
                        """This function is a scope container to pass
1675
 
                        func1 and func2 to the "call_both" function
1676
 
                        outside of its arguments"""
1677
 
 
1678
 
                        @functools.wraps(func2)
1679
 
                        def call_both(*args, **kwargs):
1680
 
                            """This function will emit two D-Bus
1681
 
                            signals by calling func1 and func2"""
1682
 
                            func1(*args, **kwargs)
1683
 
                            func2(*args, **kwargs)
1684
 
                        # Make wrapper function look like a D-Bus
1685
 
                        # signal
1686
 
                        for name, attr in inspect.getmembers(func2):
1687
 
                            if name.startswith("_dbus_"):
1688
 
                                setattr(call_both, name, attr)
1689
 
 
1690
 
                        return call_both
1691
 
                    # Create the "call_both" function and add it to
1692
 
                    # the class
1693
 
                    attr[attrname] = fixscope(attribute, new_function)
1694
 
                # Is this a D-Bus method?
1695
 
                elif getattr(attribute, "_dbus_is_method", False):
1696
 
                    # Create a new, but exactly alike, function
1697
 
                    # object.  Decorate it to be a new D-Bus method
1698
 
                    # with the alternate D-Bus interface name.  Add it
1699
 
                    # to the class.
1700
 
                    attr[attrname] = (
1701
 
                        dbus.service.method(
1702
 
                            alt_interface,
1703
 
                            attribute._dbus_in_signature,
1704
 
                            attribute._dbus_out_signature)
1705
 
                        (copy_function(attribute)))
1706
 
                    # Copy annotations, if any
1707
 
                    try:
1708
 
                        attr[attrname]._dbus_annotations = dict(
1709
 
                            attribute._dbus_annotations)
1710
 
                    except AttributeError:
1711
 
                        pass
1712
 
                # Is this a D-Bus property?
1713
 
                elif getattr(attribute, "_dbus_is_property", False):
1714
 
                    # Create a new, but exactly alike, function
1715
 
                    # object, and decorate it to be a new D-Bus
1716
 
                    # property with the alternate D-Bus interface
1717
 
                    # name.  Add it to the class.
1718
 
                    attr[attrname] = (dbus_service_property(
1719
 
                        alt_interface, attribute._dbus_signature,
1720
 
                        attribute._dbus_access,
1721
 
                        attribute._dbus_get_args_options
1722
 
                        ["byte_arrays"])
1723
 
                                      (copy_function(attribute)))
1724
 
                    # Copy annotations, if any
1725
 
                    try:
1726
 
                        attr[attrname]._dbus_annotations = dict(
1727
 
                            attribute._dbus_annotations)
1728
 
                    except AttributeError:
1729
 
                        pass
1730
 
                # Is this a D-Bus interface?
1731
 
                elif getattr(attribute, "_dbus_is_interface", False):
1732
 
                    # Create a new, but exactly alike, function
1733
 
                    # object.  Decorate it to be a new D-Bus interface
1734
 
                    # with the alternate D-Bus interface name.  Add it
1735
 
                    # to the class.
1736
 
                    attr[attrname] = (
1737
 
                        dbus_interface_annotations(alt_interface)
1738
 
                        (copy_function(attribute)))
1739
 
            if deprecate:
1740
 
                # Deprecate all alternate interfaces
1741
 
                iname = "_AlternateDBusNames_interface_annotation{}"
1742
 
                for interface_name in interface_names:
1743
 
 
1744
 
                    @dbus_interface_annotations(interface_name)
1745
 
                    def func(self):
1746
 
                        return {"org.freedesktop.DBus.Deprecated":
1747
 
                                "true"}
1748
 
                    # Find an unused name
1749
 
                    for aname in (iname.format(i)
1750
 
                                  for i in itertools.count()):
1751
 
                        if aname not in attr:
1752
 
                            attr[aname] = func
1753
 
                            break
1754
 
            if interface_names:
1755
 
                # Replace the class with a new subclass of it with
1756
 
                # methods, signals, etc. as created above.
1757
 
                if sys.version_info.major == 2:
1758
 
                    cls = type(b"{}Alternate".format(cls.__name__),
1759
 
                               (cls, ), attr)
1760
 
                else:
1761
 
                    cls = type("{}Alternate".format(cls.__name__),
1762
 
                               (cls, ), attr)
1763
 
        return cls
1764
 
 
1765
 
    return wrapper
1766
 
 
1767
 
 
1768
 
@alternate_dbus_interfaces({"se.recompile.Mandos":
1769
 
                            "se.bsnet.fukt.Mandos"})
1770
 
class ClientDBus(Client, DBusObjectWithProperties):
1771
 
    """A Client class using D-Bus
1772
 
 
1773
 
    Attributes:
1774
 
    dbus_object_path: dbus.ObjectPath
1775
 
    bus: dbus.SystemBus()
1776
 
    """
1777
 
 
1778
 
    runtime_expansions = (Client.runtime_expansions
1779
 
                          + ("dbus_object_path", ))
1780
 
 
1781
 
    _interface = "se.recompile.Mandos.Client"
1782
 
 
1783
 
    # dbus.service.Object doesn't use super(), so we can't either.
1784
 
 
1785
 
    def __init__(self, bus=None, *args, **kwargs):
1786
 
        self.bus = bus
1787
 
        Client.__init__(self, *args, **kwargs)
1788
 
        # Only now, when this client is initialized, can it show up on
1789
 
        # the D-Bus
1790
 
        client_object_name = str(self.name).translate(
1791
 
            {ord("."): ord("_"),
1792
 
             ord("-"): ord("_")})
1793
 
        self.dbus_object_path = dbus.ObjectPath(
1794
 
            "/clients/" + client_object_name)
1795
 
        DBusObjectWithProperties.__init__(self, self.bus,
1796
 
                                          self.dbus_object_path)
1797
 
 
1798
 
    def notifychangeproperty(transform_func, dbus_name,
1799
 
                             type_func=lambda x: x,
1800
 
                             variant_level=1,
1801
 
                             invalidate_only=False,
1802
 
                             _interface=_interface):
1803
 
        """ Modify a variable so that it's a property which announces
1804
 
        its changes to DBus.
1805
 
 
1806
 
        transform_fun: Function that takes a value and a variant_level
1807
 
                       and transforms it to a D-Bus type.
1808
 
        dbus_name: D-Bus name of the variable
1809
 
        type_func: Function that transform the value before sending it
1810
 
                   to the D-Bus.  Default: no transform
1811
 
        variant_level: D-Bus variant level.  Default: 1
1812
 
        """
1813
 
        attrname = "_{}".format(dbus_name)
1814
 
 
1815
 
        def setter(self, value):
1816
 
            if hasattr(self, "dbus_object_path"):
1817
 
                if (not hasattr(self, attrname) or
1818
 
                    type_func(getattr(self, attrname, None))
1819
 
                    != type_func(value)):
1820
 
                    if invalidate_only:
1821
 
                        self.PropertiesChanged(
1822
 
                            _interface, dbus.Dictionary(),
1823
 
                            dbus.Array((dbus_name, )))
1824
 
                    else:
1825
 
                        dbus_value = transform_func(
1826
 
                            type_func(value),
1827
 
                            variant_level=variant_level)
1828
 
                        self.PropertyChanged(dbus.String(dbus_name),
1829
 
                                             dbus_value)
1830
 
                        self.PropertiesChanged(
1831
 
                            _interface,
1832
 
                            dbus.Dictionary({dbus.String(dbus_name):
1833
 
                                             dbus_value}),
1834
 
                            dbus.Array())
1835
 
            setattr(self, attrname, value)
1836
 
 
1837
 
        return property(lambda self: getattr(self, attrname), setter)
1838
 
 
1839
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
1840
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
1841
 
                                             "ApprovalPending",
1842
 
                                             type_func=bool)
1843
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1844
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
1845
 
                                        "LastEnabled")
1846
 
    checker = notifychangeproperty(
1847
 
        dbus.Boolean, "CheckerRunning",
1848
 
        type_func=lambda checker: checker is not None)
1849
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
1850
 
                                           "LastCheckedOK")
1851
 
    last_checker_status = notifychangeproperty(dbus.Int16,
1852
 
                                               "LastCheckerStatus")
1853
 
    last_approval_request = notifychangeproperty(
1854
 
        datetime_to_dbus, "LastApprovalRequest")
1855
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
1856
 
                                               "ApprovedByDefault")
1857
 
    approval_delay = notifychangeproperty(
1858
 
        dbus.UInt64, "ApprovalDelay",
1859
 
        type_func=lambda td: td.total_seconds() * 1000)
1860
 
    approval_duration = notifychangeproperty(
1861
 
        dbus.UInt64, "ApprovalDuration",
1862
 
        type_func=lambda td: td.total_seconds() * 1000)
1863
 
    host = notifychangeproperty(dbus.String, "Host")
1864
 
    timeout = notifychangeproperty(
1865
 
        dbus.UInt64, "Timeout",
1866
 
        type_func=lambda td: td.total_seconds() * 1000)
1867
 
    extended_timeout = notifychangeproperty(
1868
 
        dbus.UInt64, "ExtendedTimeout",
1869
 
        type_func=lambda td: td.total_seconds() * 1000)
1870
 
    interval = notifychangeproperty(
1871
 
        dbus.UInt64, "Interval",
1872
 
        type_func=lambda td: td.total_seconds() * 1000)
1873
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
1874
 
    secret = notifychangeproperty(dbus.ByteArray, "Secret",
1875
 
                                  invalidate_only=True)
1876
 
 
1877
 
    del notifychangeproperty
1878
 
 
1879
 
    def __del__(self, *args, **kwargs):
1880
 
        try:
1881
 
            self.remove_from_connection()
1882
 
        except LookupError:
1883
 
            pass
1884
 
        if hasattr(DBusObjectWithProperties, "__del__"):
1885
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
1886
 
        Client.__del__(self, *args, **kwargs)
1887
 
 
1888
 
    def checker_callback(self, source, condition,
1889
 
                         connection, command, *args, **kwargs):
1890
 
        ret = Client.checker_callback(self, source, condition,
1891
 
                                      connection, command, *args,
1892
 
                                      **kwargs)
1893
 
        exitstatus = self.last_checker_status
1894
 
        if exitstatus >= 0:
1895
 
            # Emit D-Bus signal
1896
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
1897
 
                                  # This is specific to GNU libC
1898
 
                                  dbus.Int64(exitstatus << 8),
1899
 
                                  dbus.String(command))
1900
 
        else:
1901
 
            # Emit D-Bus signal
1902
 
            self.CheckerCompleted(dbus.Int16(-1),
1903
 
                                  dbus.Int64(
1904
 
                                      # This is specific to GNU libC
1905
 
                                      (exitstatus << 8)
1906
 
                                      | self.last_checker_signal),
1907
 
                                  dbus.String(command))
1908
 
        return ret
1909
 
 
1910
 
    def start_checker(self, *args, **kwargs):
1911
 
        old_checker_pid = getattr(self.checker, "pid", None)
1912
 
        r = Client.start_checker(self, *args, **kwargs)
1913
 
        # Only if new checker process was started
1914
 
        if (self.checker is not None
1915
 
            and old_checker_pid != self.checker.pid):
1916
 
            # Emit D-Bus signal
1917
 
            self.CheckerStarted(self.current_checker_command)
1918
 
        return r
1919
 
 
1920
 
    def _reset_approved(self):
1921
 
        self.approved = None
1922
 
        return False
1923
 
 
1924
 
    def approve(self, value=True):
1925
 
        self.approved = value
1926
 
        GLib.timeout_add(int(self.approval_duration.total_seconds()
1927
 
                             * 1000), self._reset_approved)
1928
 
        self.send_changedstate()
1929
 
 
1930
 
    #  D-Bus methods, signals & properties
1931
 
 
1932
 
    #  Interfaces
1933
 
 
1934
 
    #  Signals
1935
 
 
1936
 
    # CheckerCompleted - signal
1937
 
    @dbus.service.signal(_interface, signature="nxs")
1938
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
1939
 
        "D-Bus signal"
1940
 
        pass
1941
 
 
1942
 
    # CheckerStarted - signal
1943
 
    @dbus.service.signal(_interface, signature="s")
1944
 
    def CheckerStarted(self, command):
1945
 
        "D-Bus signal"
1946
 
        pass
1947
 
 
1948
 
    # PropertyChanged - signal
1949
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1950
 
    @dbus.service.signal(_interface, signature="sv")
1951
 
    def PropertyChanged(self, property, value):
1952
 
        "D-Bus signal"
1953
 
        pass
1954
 
 
1955
 
    # GotSecret - signal
1956
 
    @dbus.service.signal(_interface)
1957
 
    def GotSecret(self):
1958
 
        """D-Bus signal
1959
 
        Is sent after a successful transfer of secret from the Mandos
1960
 
        server to mandos-client
1961
 
        """
1962
 
        pass
1963
 
 
1964
 
    # Rejected - signal
1965
 
    @dbus.service.signal(_interface, signature="s")
1966
 
    def Rejected(self, reason):
1967
 
        "D-Bus signal"
1968
 
        pass
1969
 
 
1970
 
    # NeedApproval - signal
1971
 
    @dbus.service.signal(_interface, signature="tb")
1972
 
    def NeedApproval(self, timeout, default):
1973
 
        "D-Bus signal"
1974
 
        return self.need_approval()
1975
 
 
1976
 
    #  Methods
1977
 
 
1978
 
    # Approve - method
1979
 
    @dbus.service.method(_interface, in_signature="b")
1980
 
    def Approve(self, value):
1981
 
        self.approve(value)
1982
 
 
1983
 
    # CheckedOK - method
1984
 
    @dbus.service.method(_interface)
1985
 
    def CheckedOK(self):
1986
 
        self.checked_ok()
1987
 
 
1988
 
    # Enable - method
1989
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1990
 
    @dbus.service.method(_interface)
1991
 
    def Enable(self):
1992
 
        "D-Bus method"
1993
 
        self.enable()
1994
 
 
1995
 
    # StartChecker - method
1996
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1997
 
    @dbus.service.method(_interface)
1998
 
    def StartChecker(self):
1999
 
        "D-Bus method"
2000
 
        self.start_checker()
2001
 
 
2002
 
    # Disable - method
2003
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
2004
 
    @dbus.service.method(_interface)
2005
 
    def Disable(self):
2006
 
        "D-Bus method"
2007
 
        self.disable()
2008
 
 
2009
 
    # StopChecker - method
2010
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
2011
 
    @dbus.service.method(_interface)
2012
 
    def StopChecker(self):
2013
 
        self.stop_checker()
2014
 
 
2015
 
    #  Properties
2016
 
 
2017
 
    # ApprovalPending - property
2018
 
    @dbus_service_property(_interface, signature="b", access="read")
2019
 
    def ApprovalPending_dbus_property(self):
2020
 
        return dbus.Boolean(bool(self.approvals_pending))
2021
 
 
2022
 
    # ApprovedByDefault - property
2023
 
    @dbus_service_property(_interface,
2024
 
                           signature="b",
2025
 
                           access="readwrite")
2026
 
    def ApprovedByDefault_dbus_property(self, value=None):
2027
 
        if value is None:       # get
2028
 
            return dbus.Boolean(self.approved_by_default)
2029
 
        self.approved_by_default = bool(value)
2030
 
 
2031
 
    # ApprovalDelay - property
2032
 
    @dbus_service_property(_interface,
2033
 
                           signature="t",
2034
 
                           access="readwrite")
2035
 
    def ApprovalDelay_dbus_property(self, value=None):
2036
 
        if value is None:       # get
2037
 
            return dbus.UInt64(self.approval_delay.total_seconds()
2038
 
                               * 1000)
2039
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
2040
 
 
2041
 
    # ApprovalDuration - property
2042
 
    @dbus_service_property(_interface,
2043
 
                           signature="t",
2044
 
                           access="readwrite")
2045
 
    def ApprovalDuration_dbus_property(self, value=None):
2046
 
        if value is None:       # get
2047
 
            return dbus.UInt64(self.approval_duration.total_seconds()
2048
 
                               * 1000)
2049
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
2050
 
 
2051
 
    # Name - property
2052
 
    @dbus_annotations(
2053
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2054
 
    @dbus_service_property(_interface, signature="s", access="read")
2055
 
    def Name_dbus_property(self):
2056
 
        return dbus.String(self.name)
2057
 
 
2058
 
    # KeyID - property
2059
 
    @dbus_annotations(
2060
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2061
 
    @dbus_service_property(_interface, signature="s", access="read")
2062
 
    def KeyID_dbus_property(self):
2063
 
        return dbus.String(self.key_id)
2064
 
 
2065
 
    # Fingerprint - property
2066
 
    @dbus_annotations(
2067
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2068
 
    @dbus_service_property(_interface, signature="s", access="read")
2069
 
    def Fingerprint_dbus_property(self):
2070
 
        return dbus.String(self.fingerprint)
2071
 
 
2072
 
    # Host - property
2073
 
    @dbus_service_property(_interface,
2074
 
                           signature="s",
2075
 
                           access="readwrite")
2076
 
    def Host_dbus_property(self, value=None):
2077
 
        if value is None:       # get
2078
 
            return dbus.String(self.host)
2079
 
        self.host = str(value)
2080
 
 
2081
 
    # Created - property
2082
 
    @dbus_annotations(
2083
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2084
 
    @dbus_service_property(_interface, signature="s", access="read")
2085
 
    def Created_dbus_property(self):
2086
 
        return datetime_to_dbus(self.created)
2087
 
 
2088
 
    # LastEnabled - property
2089
 
    @dbus_service_property(_interface, signature="s", access="read")
2090
 
    def LastEnabled_dbus_property(self):
2091
 
        return datetime_to_dbus(self.last_enabled)
2092
 
 
2093
 
    # Enabled - property
2094
 
    @dbus_service_property(_interface,
2095
 
                           signature="b",
2096
 
                           access="readwrite")
2097
 
    def Enabled_dbus_property(self, value=None):
2098
 
        if value is None:       # get
2099
 
            return dbus.Boolean(self.enabled)
2100
 
        if value:
2101
 
            self.enable()
2102
 
        else:
2103
 
            self.disable()
2104
 
 
2105
 
    # LastCheckedOK - property
2106
 
    @dbus_service_property(_interface,
2107
 
                           signature="s",
2108
 
                           access="readwrite")
2109
 
    def LastCheckedOK_dbus_property(self, value=None):
2110
 
        if value is not None:
2111
 
            self.checked_ok()
2112
 
            return
2113
 
        return datetime_to_dbus(self.last_checked_ok)
2114
 
 
2115
 
    # LastCheckerStatus - property
2116
 
    @dbus_service_property(_interface, signature="n", access="read")
2117
 
    def LastCheckerStatus_dbus_property(self):
2118
 
        return dbus.Int16(self.last_checker_status)
2119
 
 
2120
 
    # Expires - property
2121
 
    @dbus_service_property(_interface, signature="s", access="read")
2122
 
    def Expires_dbus_property(self):
2123
 
        return datetime_to_dbus(self.expires)
2124
 
 
2125
 
    # LastApprovalRequest - property
2126
 
    @dbus_service_property(_interface, signature="s", access="read")
2127
 
    def LastApprovalRequest_dbus_property(self):
2128
 
        return datetime_to_dbus(self.last_approval_request)
2129
 
 
2130
 
    # Timeout - property
2131
 
    @dbus_service_property(_interface,
2132
 
                           signature="t",
2133
 
                           access="readwrite")
2134
 
    def Timeout_dbus_property(self, value=None):
2135
 
        if value is None:       # get
2136
 
            return dbus.UInt64(self.timeout.total_seconds() * 1000)
2137
 
        old_timeout = self.timeout
2138
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
2139
 
        # Reschedule disabling
2140
 
        if self.enabled:
2141
 
            now = datetime.datetime.utcnow()
2142
 
            self.expires += self.timeout - old_timeout
2143
 
            if self.expires <= now:
2144
 
                # The timeout has passed
2145
 
                self.disable()
2146
 
            else:
2147
 
                if (getattr(self, "disable_initiator_tag", None)
2148
 
                    is None):
2149
 
                    return
2150
 
                GLib.source_remove(self.disable_initiator_tag)
2151
 
                self.disable_initiator_tag = GLib.timeout_add(
2152
 
                    int((self.expires - now).total_seconds() * 1000),
2153
 
                    self.disable)
2154
 
 
2155
 
    # ExtendedTimeout - property
2156
 
    @dbus_service_property(_interface,
2157
 
                           signature="t",
2158
 
                           access="readwrite")
2159
 
    def ExtendedTimeout_dbus_property(self, value=None):
2160
 
        if value is None:       # get
2161
 
            return dbus.UInt64(self.extended_timeout.total_seconds()
2162
 
                               * 1000)
2163
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
2164
 
 
2165
 
    # Interval - property
2166
 
    @dbus_service_property(_interface,
2167
 
                           signature="t",
2168
 
                           access="readwrite")
2169
 
    def Interval_dbus_property(self, value=None):
2170
 
        if value is None:       # get
2171
 
            return dbus.UInt64(self.interval.total_seconds() * 1000)
2172
 
        self.interval = datetime.timedelta(0, 0, 0, value)
2173
 
        if getattr(self, "checker_initiator_tag", None) is None:
2174
 
            return
2175
 
        if self.enabled:
2176
 
            # Reschedule checker run
2177
 
            GLib.source_remove(self.checker_initiator_tag)
2178
 
            self.checker_initiator_tag = GLib.timeout_add(
2179
 
                value, self.start_checker)
2180
 
            self.start_checker()  # Start one now, too
2181
 
 
2182
 
    # Checker - property
2183
 
    @dbus_service_property(_interface,
2184
 
                           signature="s",
2185
 
                           access="readwrite")
2186
 
    def Checker_dbus_property(self, value=None):
2187
 
        if value is None:       # get
2188
 
            return dbus.String(self.checker_command)
2189
 
        self.checker_command = str(value)
2190
 
 
2191
 
    # CheckerRunning - property
2192
 
    @dbus_service_property(_interface,
2193
 
                           signature="b",
2194
 
                           access="readwrite")
2195
 
    def CheckerRunning_dbus_property(self, value=None):
2196
 
        if value is None:       # get
2197
 
            return dbus.Boolean(self.checker is not None)
2198
 
        if value:
2199
 
            self.start_checker()
2200
 
        else:
2201
 
            self.stop_checker()
2202
 
 
2203
 
    # ObjectPath - property
2204
 
    @dbus_annotations(
2205
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",
2206
 
         "org.freedesktop.DBus.Deprecated": "true"})
2207
 
    @dbus_service_property(_interface, signature="o", access="read")
2208
 
    def ObjectPath_dbus_property(self):
2209
 
        return self.dbus_object_path  # is already a dbus.ObjectPath
2210
 
 
2211
 
    # Secret = property
2212
 
    @dbus_annotations(
2213
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal":
2214
 
         "invalidates"})
2215
 
    @dbus_service_property(_interface,
2216
 
                           signature="ay",
2217
 
                           access="write",
2218
 
                           byte_arrays=True)
2219
 
    def Secret_dbus_property(self, value):
2220
 
        self.secret = bytes(value)
2221
 
 
2222
 
    del _interface
2223
 
 
2224
 
 
2225
 
class ProxyClient:
2226
 
    def __init__(self, child_pipe, key_id, fpr, address):
2227
 
        self._pipe = child_pipe
2228
 
        self._pipe.send(('init', key_id, fpr, address))
2229
 
        if not self._pipe.recv():
2230
 
            raise KeyError(key_id or fpr)
2231
 
 
2232
 
    def __getattribute__(self, name):
2233
 
        if name == '_pipe':
2234
 
            return super(ProxyClient, self).__getattribute__(name)
2235
 
        self._pipe.send(('getattr', name))
2236
 
        data = self._pipe.recv()
2237
 
        if data[0] == 'data':
2238
 
            return data[1]
2239
 
        if data[0] == 'function':
2240
 
 
2241
 
            def func(*args, **kwargs):
2242
 
                self._pipe.send(('funcall', name, args, kwargs))
2243
 
                return self._pipe.recv()[1]
2244
 
 
2245
 
            return func
2246
 
 
2247
 
    def __setattr__(self, name, value):
2248
 
        if name == '_pipe':
2249
 
            return super(ProxyClient, self).__setattr__(name, value)
2250
 
        self._pipe.send(('setattr', name, value))
2251
 
 
2252
 
 
2253
 
class ClientHandler(socketserver.BaseRequestHandler, object):
2254
 
    """A class to handle client connections.
2255
 
 
2256
 
    Instantiated once for each connection to handle it.
 
248
    def still_valid(self, now=None):
 
249
        """Has the timeout not yet passed for this client?"""
 
250
        if now is None:
 
251
            now = datetime.datetime.now()
 
252
        if self.last_seen is None:
 
253
            return now < (self.created + self.timeout)
 
254
        else:
 
255
            return now < (self.last_seen + self.timeout)
 
256
 
 
257
 
 
258
def peer_certificate(session):
 
259
    # If not an OpenPGP certificate...
 
260
    if gnutls.library.functions.gnutls_certificate_type_get\
 
261
            (session._c_object) \
 
262
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
263
        # ...do the normal thing
 
264
        return session.peer_certificate
 
265
    list_size = ctypes.c_uint()
 
266
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
267
        (session._c_object, ctypes.byref(list_size))
 
268
    if list_size.value == 0:
 
269
        return None
 
270
    cert = cert_list[0]
 
271
    return ctypes.string_at(cert.data, cert.size)
 
272
 
 
273
 
 
274
def fingerprint(openpgp):
 
275
    # New empty GnuTLS certificate
 
276
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
277
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
278
        (ctypes.byref(crt))
 
279
    # New GnuTLS "datum" with the OpenPGP public key
 
280
    datum = gnutls.library.types.gnutls_datum_t\
 
281
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
282
                     ctypes.POINTER(ctypes.c_ubyte)),
 
283
         ctypes.c_uint(len(openpgp)))
 
284
    # Import the OpenPGP public key into the certificate
 
285
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
286
        (crt,
 
287
         ctypes.byref(datum),
 
288
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
289
    # New buffer for the fingerprint
 
290
    buffer = ctypes.create_string_buffer(20)
 
291
    buffer_length = ctypes.c_size_t()
 
292
    # Get the fingerprint from the certificate into the buffer
 
293
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
294
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
295
    # Deinit the certificate
 
296
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
297
    # Convert the buffer to a Python bytestring
 
298
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
299
    # Convert the bytestring to hexadecimal notation
 
300
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
301
    return hex_fpr
 
302
 
 
303
 
 
304
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
305
    """A TCP request handler class.
 
306
    Instantiated by IPv6_TCPServer for each request to handle it.
2257
307
    Note: This will run in its own forked process."""
2258
 
 
 
308
    
2259
309
    def handle(self):
2260
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
2261
 
            logger.info("TCP connection from: %s",
2262
 
                        str(self.client_address))
2263
 
            logger.debug("Pipe FD: %d",
2264
 
                         self.server.child_pipe.fileno())
2265
 
 
2266
 
            session = gnutls.ClientSession(self.request)
2267
 
 
2268
 
            # priority = ':'.join(("NONE", "+VERS-TLS1.1",
2269
 
            #                       "+AES-256-CBC", "+SHA1",
2270
 
            #                       "+COMP-NULL", "+CTYPE-OPENPGP",
2271
 
            #                       "+DHE-DSS"))
2272
 
            # Use a fallback default, since this MUST be set.
2273
 
            priority = self.server.gnutls_priority
2274
 
            if priority is None:
2275
 
                priority = "NORMAL"
2276
 
            gnutls.priority_set_direct(session._c_object,
2277
 
                                       priority.encode("utf-8"),
2278
 
                                       None)
2279
 
 
2280
 
            # Start communication using the Mandos protocol
2281
 
            # Get protocol number
2282
 
            line = self.request.makefile().readline()
2283
 
            logger.debug("Protocol version: %r", line)
2284
 
            try:
2285
 
                if int(line.strip().split()[0]) > 1:
2286
 
                    raise RuntimeError(line)
2287
 
            except (ValueError, IndexError, RuntimeError) as error:
2288
 
                logger.error("Unknown protocol version: %s", error)
2289
 
                return
2290
 
 
2291
 
            # Start GnuTLS connection
2292
 
            try:
2293
 
                session.handshake()
2294
 
            except gnutls.Error as error:
2295
 
                logger.warning("Handshake failed: %s", error)
2296
 
                # Do not run session.bye() here: the session is not
2297
 
                # established.  Just abandon the request.
2298
 
                return
2299
 
            logger.debug("Handshake succeeded")
2300
 
 
2301
 
            approval_required = False
2302
 
            try:
2303
 
                if gnutls.has_rawpk:
2304
 
                    fpr = b""
2305
 
                    try:
2306
 
                        key_id = self.key_id(
2307
 
                            self.peer_certificate(session))
2308
 
                    except (TypeError, gnutls.Error) as error:
2309
 
                        logger.warning("Bad certificate: %s", error)
2310
 
                        return
2311
 
                    logger.debug("Key ID: %s", key_id)
2312
 
 
2313
 
                else:
2314
 
                    key_id = b""
2315
 
                    try:
2316
 
                        fpr = self.fingerprint(
2317
 
                            self.peer_certificate(session))
2318
 
                    except (TypeError, gnutls.Error) as error:
2319
 
                        logger.warning("Bad certificate: %s", error)
2320
 
                        return
2321
 
                    logger.debug("Fingerprint: %s", fpr)
2322
 
 
2323
 
                try:
2324
 
                    client = ProxyClient(child_pipe, key_id, fpr,
2325
 
                                         self.client_address)
2326
 
                except KeyError:
2327
 
                    return
2328
 
 
2329
 
                if client.approval_delay:
2330
 
                    delay = client.approval_delay
2331
 
                    client.approvals_pending += 1
2332
 
                    approval_required = True
2333
 
 
2334
 
                while True:
2335
 
                    if not client.enabled:
2336
 
                        logger.info("Client %s is disabled",
2337
 
                                    client.name)
2338
 
                        if self.server.use_dbus:
2339
 
                            # Emit D-Bus signal
2340
 
                            client.Rejected("Disabled")
2341
 
                        return
2342
 
 
2343
 
                    if client.approved or not client.approval_delay:
2344
 
                        # We are approved or approval is disabled
2345
 
                        break
2346
 
                    elif client.approved is None:
2347
 
                        logger.info("Client %s needs approval",
2348
 
                                    client.name)
2349
 
                        if self.server.use_dbus:
2350
 
                            # Emit D-Bus signal
2351
 
                            client.NeedApproval(
2352
 
                                client.approval_delay.total_seconds()
2353
 
                                * 1000, client.approved_by_default)
2354
 
                    else:
2355
 
                        logger.warning("Client %s was not approved",
2356
 
                                       client.name)
2357
 
                        if self.server.use_dbus:
2358
 
                            # Emit D-Bus signal
2359
 
                            client.Rejected("Denied")
2360
 
                        return
2361
 
 
2362
 
                    # wait until timeout or approved
2363
 
                    time = datetime.datetime.now()
2364
 
                    client.changedstate.acquire()
2365
 
                    client.changedstate.wait(delay.total_seconds())
2366
 
                    client.changedstate.release()
2367
 
                    time2 = datetime.datetime.now()
2368
 
                    if (time2 - time) >= delay:
2369
 
                        if not client.approved_by_default:
2370
 
                            logger.warning("Client %s timed out while"
2371
 
                                           " waiting for approval",
2372
 
                                           client.name)
2373
 
                            if self.server.use_dbus:
2374
 
                                # Emit D-Bus signal
2375
 
                                client.Rejected("Approval timed out")
2376
 
                            return
2377
 
                        else:
2378
 
                            break
2379
 
                    else:
2380
 
                        delay -= time2 - time
2381
 
 
2382
 
                try:
2383
 
                    session.send(client.secret)
2384
 
                except gnutls.Error as error:
2385
 
                    logger.warning("gnutls send failed",
2386
 
                                   exc_info=error)
2387
 
                    return
2388
 
 
2389
 
                logger.info("Sending secret to %s", client.name)
2390
 
                # bump the timeout using extended_timeout
2391
 
                client.bump_timeout(client.extended_timeout)
2392
 
                if self.server.use_dbus:
2393
 
                    # Emit D-Bus signal
2394
 
                    client.GotSecret()
2395
 
 
2396
 
            finally:
2397
 
                if approval_required:
2398
 
                    client.approvals_pending -= 1
2399
 
                try:
2400
 
                    session.bye()
2401
 
                except gnutls.Error as error:
2402
 
                    logger.warning("GnuTLS bye failed",
2403
 
                                   exc_info=error)
2404
 
 
2405
 
    @staticmethod
2406
 
    def peer_certificate(session):
2407
 
        "Return the peer's certificate as a bytestring"
2408
 
        try:
2409
 
            cert_type = gnutls.certificate_type_get2(session._c_object,
2410
 
                                                     gnutls.CTYPE_PEERS)
2411
 
        except AttributeError:
2412
 
            cert_type = gnutls.certificate_type_get(session._c_object)
2413
 
        if gnutls.has_rawpk:
2414
 
            valid_cert_types = frozenset((gnutls.CRT_RAWPK,))
2415
 
        else:
2416
 
            valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))
2417
 
        # If not a valid certificate type...
2418
 
        if cert_type not in valid_cert_types:
2419
 
            logger.info("Cert type %r not in %r", cert_type,
2420
 
                        valid_cert_types)
2421
 
            # ...return invalid data
2422
 
            return b""
2423
 
        list_size = ctypes.c_uint(1)
2424
 
        cert_list = (gnutls.certificate_get_peers
2425
 
                     (session._c_object, ctypes.byref(list_size)))
2426
 
        if not bool(cert_list) and list_size.value != 0:
2427
 
            raise gnutls.Error("error getting peer certificate")
2428
 
        if list_size.value == 0:
2429
 
            return None
2430
 
        cert = cert_list[0]
2431
 
        return ctypes.string_at(cert.data, cert.size)
2432
 
 
2433
 
    @staticmethod
2434
 
    def key_id(certificate):
2435
 
        "Convert a certificate bytestring to a hexdigit key ID"
2436
 
        # New GnuTLS "datum" with the public key
2437
 
        datum = gnutls.datum_t(
2438
 
            ctypes.cast(ctypes.c_char_p(certificate),
2439
 
                        ctypes.POINTER(ctypes.c_ubyte)),
2440
 
            ctypes.c_uint(len(certificate)))
2441
 
        # XXX all these need to be created in the gnutls "module"
2442
 
        # New empty GnuTLS certificate
2443
 
        pubkey = gnutls.pubkey_t()
2444
 
        gnutls.pubkey_init(ctypes.byref(pubkey))
2445
 
        # Import the raw public key into the certificate
2446
 
        gnutls.pubkey_import(pubkey,
2447
 
                             ctypes.byref(datum),
2448
 
                             gnutls.X509_FMT_DER)
2449
 
        # New buffer for the key ID
2450
 
        buf = ctypes.create_string_buffer(32)
2451
 
        buf_len = ctypes.c_size_t(len(buf))
2452
 
        # Get the key ID from the raw public key into the buffer
2453
 
        gnutls.pubkey_get_key_id(pubkey,
2454
 
                                 gnutls.KEYID_USE_SHA256,
2455
 
                                 ctypes.cast(ctypes.byref(buf),
2456
 
                                             ctypes.POINTER(ctypes.c_ubyte)),
2457
 
                                 ctypes.byref(buf_len))
2458
 
        # Deinit the certificate
2459
 
        gnutls.pubkey_deinit(pubkey)
2460
 
 
2461
 
        # Convert the buffer to a Python bytestring
2462
 
        key_id = ctypes.string_at(buf, buf_len.value)
2463
 
        # Convert the bytestring to hexadecimal notation
2464
 
        hex_key_id = binascii.hexlify(key_id).upper()
2465
 
        return hex_key_id
2466
 
 
2467
 
    @staticmethod
2468
 
    def fingerprint(openpgp):
2469
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
2470
 
        # New GnuTLS "datum" with the OpenPGP public key
2471
 
        datum = gnutls.datum_t(
2472
 
            ctypes.cast(ctypes.c_char_p(openpgp),
2473
 
                        ctypes.POINTER(ctypes.c_ubyte)),
2474
 
            ctypes.c_uint(len(openpgp)))
2475
 
        # New empty GnuTLS certificate
2476
 
        crt = gnutls.openpgp_crt_t()
2477
 
        gnutls.openpgp_crt_init(ctypes.byref(crt))
2478
 
        # Import the OpenPGP public key into the certificate
2479
 
        gnutls.openpgp_crt_import(crt, ctypes.byref(datum),
2480
 
                                  gnutls.OPENPGP_FMT_RAW)
2481
 
        # Verify the self signature in the key
2482
 
        crtverify = ctypes.c_uint()
2483
 
        gnutls.openpgp_crt_verify_self(crt, 0,
2484
 
                                       ctypes.byref(crtverify))
2485
 
        if crtverify.value != 0:
2486
 
            gnutls.openpgp_crt_deinit(crt)
2487
 
            raise gnutls.CertificateSecurityError(code
2488
 
                                                  =crtverify.value)
2489
 
        # New buffer for the fingerprint
2490
 
        buf = ctypes.create_string_buffer(20)
2491
 
        buf_len = ctypes.c_size_t()
2492
 
        # Get the fingerprint from the certificate into the buffer
2493
 
        gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
2494
 
                                           ctypes.byref(buf_len))
2495
 
        # Deinit the certificate
2496
 
        gnutls.openpgp_crt_deinit(crt)
2497
 
        # Convert the buffer to a Python bytestring
2498
 
        fpr = ctypes.string_at(buf, buf_len.value)
2499
 
        # Convert the bytestring to hexadecimal notation
2500
 
        hex_fpr = binascii.hexlify(fpr).upper()
2501
 
        return hex_fpr
2502
 
 
2503
 
 
2504
 
class MultiprocessingMixIn:
2505
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
2506
 
 
2507
 
    def sub_process_main(self, request, address):
2508
 
        try:
2509
 
            self.finish_request(request, address)
2510
 
        except Exception:
2511
 
            self.handle_error(request, address)
2512
 
        self.close_request(request)
2513
 
 
2514
 
    def process_request(self, request, address):
2515
 
        """Start a new process to process the request."""
2516
 
        proc = multiprocessing.Process(target=self.sub_process_main,
2517
 
                                       args=(request, address))
2518
 
        proc.start()
2519
 
        return proc
2520
 
 
2521
 
 
2522
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn):
2523
 
    """ adds a pipe to the MixIn """
2524
 
 
2525
 
    def process_request(self, request, client_address):
2526
 
        """Overrides and wraps the original process_request().
2527
 
 
2528
 
        This function creates a new pipe in self.pipe
2529
 
        """
2530
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
2531
 
 
2532
 
        proc = MultiprocessingMixIn.process_request(self, request,
2533
 
                                                    client_address)
2534
 
        self.child_pipe.close()
2535
 
        self.add_pipe(parent_pipe, proc)
2536
 
 
2537
 
    def add_pipe(self, parent_pipe, proc):
2538
 
        """Dummy function; override as necessary"""
2539
 
        raise NotImplementedError()
2540
 
 
2541
 
 
2542
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
2543
 
                     socketserver.TCPServer):
2544
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
2545
 
 
 
310
        logger.debug(u"TCP connection from: %s",
 
311
                     unicode(self.client_address))
 
312
        session = gnutls.connection.ClientSession(self.request,
 
313
                                                  gnutls.connection.\
 
314
                                                  X509Credentials())
 
315
        
 
316
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
317
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
318
        #                "+DHE-DSS"))
 
319
        priority = "SECURE256"
 
320
        
 
321
        gnutls.library.functions.gnutls_priority_set_direct\
 
322
            (session._c_object, priority, None);
 
323
        
 
324
        try:
 
325
            session.handshake()
 
326
        except gnutls.errors.GNUTLSError, error:
 
327
            logger.debug(u"Handshake failed: %s", error)
 
328
            # Do not run session.bye() here: the session is not
 
329
            # established.  Just abandon the request.
 
330
            return
 
331
        try:
 
332
            fpr = fingerprint(peer_certificate(session))
 
333
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
334
            logger.debug(u"Bad certificate: %s", error)
 
335
            session.bye()
 
336
            return
 
337
        logger.debug(u"Fingerprint: %s", fpr)
 
338
        client = None
 
339
        for c in clients:
 
340
            if c.fingerprint == fpr:
 
341
                client = c
 
342
                break
 
343
        # Have to check if client.still_valid(), since it is possible
 
344
        # that the client timed out while establishing the GnuTLS
 
345
        # session.
 
346
        if (not client) or (not client.still_valid()):
 
347
            if client:
 
348
                logger.debug(u"Client %(name)s is invalid",
 
349
                             vars(client))
 
350
            else:
 
351
                logger.debug(u"Client not found for fingerprint: %s",
 
352
                             fpr)
 
353
            session.bye()
 
354
            return
 
355
        sent_size = 0
 
356
        while sent_size < len(client.secret):
 
357
            sent = session.send(client.secret[sent_size:])
 
358
            logger.debug(u"Sent: %d, remaining: %d",
 
359
                         sent, len(client.secret)
 
360
                         - (sent_size + sent))
 
361
            sent_size += sent
 
362
        session.bye()
 
363
 
 
364
 
 
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
366
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
2546
367
    Attributes:
2547
 
        enabled:        Boolean; whether this server is activated yet
2548
 
        interface:      None or a network interface name (string)
2549
 
        use_ipv6:       Boolean; to use IPv6 or not
 
368
        options:        Command line options
 
369
        clients:        Set() of Client objects
2550
370
    """
2551
 
 
2552
 
    def __init__(self, server_address, RequestHandlerClass,
2553
 
                 interface=None,
2554
 
                 use_ipv6=True,
2555
 
                 socketfd=None):
2556
 
        """If socketfd is set, use that file descriptor instead of
2557
 
        creating a new one with socket.socket().
2558
 
        """
2559
 
        self.interface = interface
2560
 
        if use_ipv6:
2561
 
            self.address_family = socket.AF_INET6
2562
 
        if socketfd is not None:
2563
 
            # Save the file descriptor
2564
 
            self.socketfd = socketfd
2565
 
            # Save the original socket.socket() function
2566
 
            self.socket_socket = socket.socket
2567
 
 
2568
 
            # To implement --socket, we monkey patch socket.socket.
2569
 
            #
2570
 
            # (When socketserver.TCPServer is a new-style class, we
2571
 
            # could make self.socket into a property instead of monkey
2572
 
            # patching socket.socket.)
2573
 
            #
2574
 
            # Create a one-time-only replacement for socket.socket()
2575
 
            @functools.wraps(socket.socket)
2576
 
            def socket_wrapper(*args, **kwargs):
2577
 
                # Restore original function so subsequent calls are
2578
 
                # not affected.
2579
 
                socket.socket = self.socket_socket
2580
 
                del self.socket_socket
2581
 
                # This time only, return a new socket object from the
2582
 
                # saved file descriptor.
2583
 
                return socket.fromfd(self.socketfd, *args, **kwargs)
2584
 
            # Replace socket.socket() function with wrapper
2585
 
            socket.socket = socket_wrapper
2586
 
        # The socketserver.TCPServer.__init__ will call
2587
 
        # socket.socket(), which might be our replacement,
2588
 
        # socket_wrapper(), if socketfd was set.
2589
 
        socketserver.TCPServer.__init__(self, server_address,
2590
 
                                        RequestHandlerClass)
2591
 
 
 
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)
2592
380
    def server_bind(self):
2593
381
        """This overrides the normal server_bind() function
2594
382
        to bind to an interface if one was specified, and also NOT to
2595
383
        bind to an address or port if they were not specified."""
2596
 
        global SO_BINDTODEVICE
2597
 
        if self.interface is not None:
2598
 
            if SO_BINDTODEVICE is None:
2599
 
                # Fall back to a hard-coded value which seems to be
2600
 
                # common enough.
2601
 
                logger.warning("SO_BINDTODEVICE not found, trying 25")
2602
 
                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
2603
388
            try:
2604
 
                self.socket.setsockopt(
2605
 
                    socket.SOL_SOCKET, SO_BINDTODEVICE,
2606
 
                    (self.interface + "\0").encode("utf-8"))
2607
 
            except socket.error as error:
2608
 
                if error.errno == errno.EPERM:
2609
 
                    logger.error("No permission to bind to"
2610
 
                                 " interface %s", self.interface)
2611
 
                elif error.errno == errno.ENOPROTOOPT:
2612
 
                    logger.error("SO_BINDTODEVICE not available;"
2613
 
                                 " cannot bind to interface %s",
2614
 
                                 self.interface)
2615
 
                elif error.errno == errno.ENODEV:
2616
 
                    logger.error("Interface %s does not exist,"
2617
 
                                 " 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
                    logger.warning(u"No permission to"
 
395
                                   u" bind to interface %s",
 
396
                                   self.options.interface)
2618
397
                else:
2619
 
                    raise
 
398
                    raise error
2620
399
        # Only bind(2) the socket if we really need to.
2621
400
        if self.server_address[0] or self.server_address[1]:
2622
 
            if self.server_address[1]:
2623
 
                self.allow_reuse_address = True
2624
401
            if not self.server_address[0]:
2625
 
                if self.address_family == socket.AF_INET6:
2626
 
                    any_address = "::"  # in6addr_any
2627
 
                else:
2628
 
                    any_address = "0.0.0.0"  # INADDR_ANY
2629
 
                self.server_address = (any_address,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
2630
404
                                       self.server_address[1])
2631
 
            elif not self.server_address[1]:
2632
 
                self.server_address = (self.server_address[0], 0)
2633
 
#                 if self.interface:
2634
 
#                     self.server_address = (self.server_address[0],
2635
 
#                                            0, # port
2636
 
#                                            0, # flowinfo
2637
 
#                                            if_nametoindex
2638
 
#                                            (self.interface))
2639
 
            return socketserver.TCPServer.server_bind(self)
2640
 
 
2641
 
 
2642
 
class MandosServer(IPv6_TCPServer):
2643
 
    """Mandos server.
2644
 
 
2645
 
    Attributes:
2646
 
        clients:        set of Client objects
2647
 
        gnutls_priority GnuTLS priority string
2648
 
        use_dbus:       Boolean; to emit D-Bus signals or not
2649
 
 
2650
 
    Assumes a GLib.MainLoop event loop.
2651
 
    """
2652
 
 
2653
 
    def __init__(self, server_address, RequestHandlerClass,
2654
 
                 interface=None,
2655
 
                 use_ipv6=True,
2656
 
                 clients=None,
2657
 
                 gnutls_priority=None,
2658
 
                 use_dbus=True,
2659
 
                 socketfd=None):
2660
 
        self.enabled = False
2661
 
        self.clients = clients
2662
 
        if self.clients is None:
2663
 
            self.clients = {}
2664
 
        self.use_dbus = use_dbus
2665
 
        self.gnutls_priority = gnutls_priority
2666
 
        IPv6_TCPServer.__init__(self, server_address,
2667
 
                                RequestHandlerClass,
2668
 
                                interface=interface,
2669
 
                                use_ipv6=use_ipv6,
2670
 
                                socketfd=socketfd)
2671
 
 
2672
 
    def server_activate(self):
2673
 
        if self.enabled:
2674
 
            return socketserver.TCPServer.server_activate(self)
2675
 
 
2676
 
    def enable(self):
2677
 
        self.enabled = True
2678
 
 
2679
 
    def add_pipe(self, parent_pipe, proc):
2680
 
        # Call "handle_ipc" for both data and EOF events
2681
 
        GLib.io_add_watch(
2682
 
            GLib.IOChannel.unix_new(parent_pipe.fileno()),
2683
 
            GLib.PRIORITY_DEFAULT, GLib.IO_IN | GLib.IO_HUP,
2684
 
            functools.partial(self.handle_ipc,
2685
 
                              parent_pipe=parent_pipe,
2686
 
                              proc=proc))
2687
 
 
2688
 
    def handle_ipc(self, source, condition,
2689
 
                   parent_pipe=None,
2690
 
                   proc=None,
2691
 
                   client_object=None):
2692
 
        # error, or the other end of multiprocessing.Pipe has closed
2693
 
        if condition & (GLib.IO_ERR | GLib.IO_HUP):
2694
 
            # Wait for other process to exit
2695
 
            proc.join()
2696
 
            return False
2697
 
 
2698
 
        # Read a request from the child
2699
 
        request = parent_pipe.recv()
2700
 
        command = request[0]
2701
 
 
2702
 
        if command == 'init':
2703
 
            key_id = request[1].decode("ascii")
2704
 
            fpr = request[2].decode("ascii")
2705
 
            address = request[3]
2706
 
 
2707
 
            for c in self.clients.values():
2708
 
                if key_id == "E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855":
2709
 
                    continue
2710
 
                if key_id and c.key_id == key_id:
2711
 
                    client = c
2712
 
                    break
2713
 
                if fpr and c.fingerprint == fpr:
2714
 
                    client = c
2715
 
                    break
2716
 
            else:
2717
 
                logger.info("Client not found for key ID: %s, address"
2718
 
                            ": %s", key_id or fpr, address)
2719
 
                if self.use_dbus:
2720
 
                    # Emit D-Bus signal
2721
 
                    mandos_dbus_service.ClientNotFound(key_id or fpr,
2722
 
                                                       address[0])
2723
 
                parent_pipe.send(False)
2724
 
                return False
2725
 
 
2726
 
            GLib.io_add_watch(
2727
 
                GLib.IOChannel.unix_new(parent_pipe.fileno()),
2728
 
                GLib.PRIORITY_DEFAULT, GLib.IO_IN | GLib.IO_HUP,
2729
 
                functools.partial(self.handle_ipc,
2730
 
                                  parent_pipe=parent_pipe,
2731
 
                                  proc=proc,
2732
 
                                  client_object=client))
2733
 
            parent_pipe.send(True)
2734
 
            # remove the old hook in favor of the new above hook on
2735
 
            # same fileno
2736
 
            return False
2737
 
        if command == 'funcall':
2738
 
            funcname = request[1]
2739
 
            args = request[2]
2740
 
            kwargs = request[3]
2741
 
 
2742
 
            parent_pipe.send(('data', getattr(client_object,
2743
 
                                              funcname)(*args,
2744
 
                                                        **kwargs)))
2745
 
 
2746
 
        if command == 'getattr':
2747
 
            attrname = request[1]
2748
 
            if isinstance(client_object.__getattribute__(attrname),
2749
 
                          collections.Callable):
2750
 
                parent_pipe.send(('function', ))
2751
 
            else:
2752
 
                parent_pipe.send((
2753
 
                    'data', client_object.__getattribute__(attrname)))
2754
 
 
2755
 
        if command == 'setattr':
2756
 
            attrname = request[1]
2757
 
            value = request[2]
2758
 
            setattr(client_object, attrname, value)
2759
 
 
2760
 
        return True
2761
 
 
2762
 
 
2763
 
def rfc3339_duration_to_delta(duration):
2764
 
    """Parse an RFC 3339 "duration" and return a datetime.timedelta
2765
 
 
2766
 
    >>> rfc3339_duration_to_delta("P7D") == datetime.timedelta(7)
2767
 
    True
2768
 
    >>> rfc3339_duration_to_delta("PT60S") == datetime.timedelta(0, 60)
2769
 
    True
2770
 
    >>> rfc3339_duration_to_delta("PT60M") == datetime.timedelta(0, 3600)
2771
 
    True
2772
 
    >>> rfc3339_duration_to_delta("PT24H") == datetime.timedelta(1)
2773
 
    True
2774
 
    >>> rfc3339_duration_to_delta("P1W") == datetime.timedelta(7)
2775
 
    True
2776
 
    >>> rfc3339_duration_to_delta("PT5M30S") == datetime.timedelta(0, 330)
2777
 
    True
2778
 
    >>> rfc3339_duration_to_delta("P1DT3M20S") == datetime.timedelta(1, 200)
2779
 
    True
2780
 
    """
2781
 
 
2782
 
    # Parsing an RFC 3339 duration with regular expressions is not
2783
 
    # possible - there would have to be multiple places for the same
2784
 
    # values, like seconds.  The current code, while more esoteric, is
2785
 
    # cleaner without depending on a parsing library.  If Python had a
2786
 
    # built-in library for parsing we would use it, but we'd like to
2787
 
    # avoid excessive use of external libraries.
2788
 
 
2789
 
    # New type for defining tokens, syntax, and semantics all-in-one
2790
 
    Token = collections.namedtuple("Token", (
2791
 
        "regexp",  # To match token; if "value" is not None, must have
2792
 
                   # a "group" containing digits
2793
 
        "value",   # datetime.timedelta or None
2794
 
        "followers"))           # Tokens valid after this token
2795
 
    # RFC 3339 "duration" tokens, syntax, and semantics; taken from
2796
 
    # the "duration" ABNF definition in RFC 3339, Appendix A.
2797
 
    token_end = Token(re.compile(r"$"), None, frozenset())
2798
 
    token_second = Token(re.compile(r"(\d+)S"),
2799
 
                         datetime.timedelta(seconds=1),
2800
 
                         frozenset((token_end, )))
2801
 
    token_minute = Token(re.compile(r"(\d+)M"),
2802
 
                         datetime.timedelta(minutes=1),
2803
 
                         frozenset((token_second, token_end)))
2804
 
    token_hour = Token(re.compile(r"(\d+)H"),
2805
 
                       datetime.timedelta(hours=1),
2806
 
                       frozenset((token_minute, token_end)))
2807
 
    token_time = Token(re.compile(r"T"),
2808
 
                       None,
2809
 
                       frozenset((token_hour, token_minute,
2810
 
                                  token_second)))
2811
 
    token_day = Token(re.compile(r"(\d+)D"),
2812
 
                      datetime.timedelta(days=1),
2813
 
                      frozenset((token_time, token_end)))
2814
 
    token_month = Token(re.compile(r"(\d+)M"),
2815
 
                        datetime.timedelta(weeks=4),
2816
 
                        frozenset((token_day, token_end)))
2817
 
    token_year = Token(re.compile(r"(\d+)Y"),
2818
 
                       datetime.timedelta(weeks=52),
2819
 
                       frozenset((token_month, token_end)))
2820
 
    token_week = Token(re.compile(r"(\d+)W"),
2821
 
                       datetime.timedelta(weeks=1),
2822
 
                       frozenset((token_end, )))
2823
 
    token_duration = Token(re.compile(r"P"), None,
2824
 
                           frozenset((token_year, token_month,
2825
 
                                      token_day, token_time,
2826
 
                                      token_week)))
2827
 
    # Define starting values:
2828
 
    # Value so far
2829
 
    value = datetime.timedelta()
2830
 
    found_token = None
2831
 
    # Following valid tokens
2832
 
    followers = frozenset((token_duration, ))
2833
 
    # String left to parse
2834
 
    s = duration
2835
 
    # Loop until end token is found
2836
 
    while found_token is not token_end:
2837
 
        # Search for any currently valid tokens
2838
 
        for token in followers:
2839
 
            match = token.regexp.match(s)
2840
 
            if match is not None:
2841
 
                # Token found
2842
 
                if token.value is not None:
2843
 
                    # Value found, parse digits
2844
 
                    factor = int(match.group(1), 10)
2845
 
                    # Add to value so far
2846
 
                    value += factor * token.value
2847
 
                # Strip token from string
2848
 
                s = token.regexp.sub("", s, 1)
2849
 
                # Go to found token
2850
 
                found_token = token
2851
 
                # Set valid next tokens
2852
 
                followers = found_token.followers
2853
 
                break
2854
 
        else:
2855
 
            # No currently valid tokens were found
2856
 
            raise ValueError("Invalid RFC 3339 duration: {!r}"
2857
 
                             .format(duration))
2858
 
    # End token found
2859
 
    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()
2860
409
 
2861
410
 
2862
411
def string_to_delta(interval):
2863
412
    """Parse a string and return a datetime.timedelta
2864
413
 
2865
 
    >>> string_to_delta('7d') == datetime.timedelta(7)
2866
 
    True
2867
 
    >>> string_to_delta('60s') == datetime.timedelta(0, 60)
2868
 
    True
2869
 
    >>> string_to_delta('60m') == datetime.timedelta(0, 3600)
2870
 
    True
2871
 
    >>> string_to_delta('24h') == datetime.timedelta(1)
2872
 
    True
2873
 
    >>> string_to_delta('1w') == datetime.timedelta(7)
2874
 
    True
2875
 
    >>> string_to_delta('5m 30s') == datetime.timedelta(0, 330)
2876
 
    True
 
414
    >>> string_to_delta('7d')
 
415
    datetime.timedelta(7)
 
416
    >>> string_to_delta('60s')
 
417
    datetime.timedelta(0, 60)
 
418
    >>> string_to_delta('60m')
 
419
    datetime.timedelta(0, 3600)
 
420
    >>> string_to_delta('24h')
 
421
    datetime.timedelta(1)
 
422
    >>> string_to_delta(u'1w')
 
423
    datetime.timedelta(7)
2877
424
    """
2878
 
 
2879
 
    try:
2880
 
        return rfc3339_duration_to_delta(interval)
2881
 
    except ValueError:
2882
 
        pass
2883
 
 
2884
 
    timevalue = datetime.timedelta(0)
2885
 
    for s in interval.split():
2886
 
        try:
2887
 
            suffix = s[-1]
2888
 
            value = int(s[:-1])
2889
 
            if suffix == "d":
2890
 
                delta = datetime.timedelta(value)
2891
 
            elif suffix == "s":
2892
 
                delta = datetime.timedelta(0, value)
2893
 
            elif suffix == "m":
2894
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
2895
 
            elif suffix == "h":
2896
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
2897
 
            elif suffix == "w":
2898
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
2899
 
            else:
2900
 
                raise ValueError("Unknown suffix {!r}".format(suffix))
2901
 
        except IndexError as e:
2902
 
            raise ValueError(*(e.args))
2903
 
        timevalue += delta
2904
 
    return timevalue
2905
 
 
2906
 
 
2907
 
def daemon(nochdir=False, noclose=False):
2908
 
    """See daemon(3).  Standard BSD Unix function.
2909
 
 
2910
 
    This should really exist as os.daemon, but it doesn't (yet)."""
2911
 
    if os.fork():
2912
 
        sys.exit()
2913
 
    os.setsid()
2914
 
    if not nochdir:
2915
 
        os.chdir("/")
2916
 
    if os.fork():
2917
 
        sys.exit()
2918
 
    if not noclose:
2919
 
        # Close all standard open file descriptors
2920
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
2921
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
2922
 
            raise OSError(errno.ENODEV,
2923
 
                          "{} not a character device"
2924
 
                          .format(os.devnull))
2925
 
        os.dup2(null, sys.stdin.fileno())
2926
 
        os.dup2(null, sys.stdout.fileno())
2927
 
        os.dup2(null, sys.stderr.fileno())
2928
 
        if null > 2:
2929
 
            os.close(null)
2930
 
 
2931
 
 
2932
 
def main():
2933
 
 
2934
 
    ##################################################################
2935
 
    # Parsing of options, both command line and config file
2936
 
 
2937
 
    parser = argparse.ArgumentParser()
2938
 
    parser.add_argument("-v", "--version", action="version",
2939
 
                        version="%(prog)s {}".format(version),
2940
 
                        help="show version number and exit")
2941
 
    parser.add_argument("-i", "--interface", metavar="IF",
2942
 
                        help="Bind to interface IF")
2943
 
    parser.add_argument("-a", "--address",
2944
 
                        help="Address to listen for requests on")
2945
 
    parser.add_argument("-p", "--port", type=int,
2946
 
                        help="Port number to receive requests on")
2947
 
    parser.add_argument("--check", action="store_true",
2948
 
                        help="Run self-test")
2949
 
    parser.add_argument("--debug", action="store_true",
2950
 
                        help="Debug mode; run in foreground and log"
2951
 
                        " to terminal", default=None)
2952
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
2953
 
                        help="Debug level for stdout output")
2954
 
    parser.add_argument("--priority", help="GnuTLS"
2955
 
                        " priority string (see GnuTLS documentation)")
2956
 
    parser.add_argument("--servicename",
2957
 
                        metavar="NAME", help="Zeroconf service name")
2958
 
    parser.add_argument("--configdir",
2959
 
                        default="/etc/mandos", metavar="DIR",
2960
 
                        help="Directory to search for configuration"
2961
 
                        " files")
2962
 
    parser.add_argument("--no-dbus", action="store_false",
2963
 
                        dest="use_dbus", help="Do not provide D-Bus"
2964
 
                        " system bus interface", default=None)
2965
 
    parser.add_argument("--no-ipv6", action="store_false",
2966
 
                        dest="use_ipv6", help="Do not use IPv6",
2967
 
                        default=None)
2968
 
    parser.add_argument("--no-restore", action="store_false",
2969
 
                        dest="restore", help="Do not restore stored"
2970
 
                        " state", default=None)
2971
 
    parser.add_argument("--socket", type=int,
2972
 
                        help="Specify a file descriptor to a network"
2973
 
                        " socket to use instead of creating one")
2974
 
    parser.add_argument("--statedir", metavar="DIR",
2975
 
                        help="Directory to save/restore state in")
2976
 
    parser.add_argument("--foreground", action="store_true",
2977
 
                        help="Run in foreground", default=None)
2978
 
    parser.add_argument("--no-zeroconf", action="store_false",
2979
 
                        dest="zeroconf", help="Do not use Zeroconf",
2980
 
                        default=None)
2981
 
 
2982
 
    options = parser.parse_args()
2983
 
 
2984
 
    # Default values for config file for server-global settings
2985
 
    if gnutls.has_rawpk:
2986
 
        priority = ("SECURE128:!CTYPE-X.509:+CTYPE-RAWPK:!RSA"
2987
 
                    ":!VERS-ALL:+VERS-TLS1.3:%PROFILE_ULTRA")
2988
 
    else:
2989
 
        priority = ("SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"
2990
 
                    ":+SIGN-DSA-SHA256")
2991
 
    server_defaults = {"interface": "",
2992
 
                       "address": "",
2993
 
                       "port": "",
2994
 
                       "debug": "False",
2995
 
                       "priority": priority,
2996
 
                       "servicename": "Mandos",
2997
 
                       "use_dbus": "True",
2998
 
                       "use_ipv6": "True",
2999
 
                       "debuglevel": "",
3000
 
                       "restore": "True",
3001
 
                       "socket": "",
3002
 
                       "statedir": "/var/lib/mandos",
3003
 
                       "foreground": "False",
3004
 
                       "zeroconf": "True",
3005
 
                       }
3006
 
    del priority
3007
 
 
3008
 
    # Parse config file for server-global settings
3009
 
    server_config = configparser.ConfigParser(server_defaults)
3010
 
    del server_defaults
3011
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
3012
 
    # Convert the ConfigParser object to a dict
3013
 
    server_settings = server_config.defaults()
3014
 
    # Use the appropriate methods on the non-string config options
3015
 
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
3016
 
                   "foreground", "zeroconf"):
3017
 
        server_settings[option] = server_config.getboolean("DEFAULT",
3018
 
                                                           option)
3019
 
    if server_settings["port"]:
3020
 
        server_settings["port"] = server_config.getint("DEFAULT",
3021
 
                                                       "port")
3022
 
    if server_settings["socket"]:
3023
 
        server_settings["socket"] = server_config.getint("DEFAULT",
3024
 
                                                         "socket")
3025
 
        # Later, stdin will, and stdout and stderr might, be dup'ed
3026
 
        # over with an opened os.devnull.  But we don't want this to
3027
 
        # happen with a supplied network socket.
3028
 
        if 0 <= server_settings["socket"] <= 2:
3029
 
            server_settings["socket"] = os.dup(server_settings
3030
 
                                               ["socket"])
3031
 
    del server_config
3032
 
 
3033
 
    # Override the settings from the config file with command line
3034
 
    # options, if set.
3035
 
    for option in ("interface", "address", "port", "debug",
3036
 
                   "priority", "servicename", "configdir", "use_dbus",
3037
 
                   "use_ipv6", "debuglevel", "restore", "statedir",
3038
 
                   "socket", "foreground", "zeroconf"):
3039
 
        value = getattr(options, option)
3040
 
        if value is not None:
3041
 
            server_settings[option] = value
3042
 
    del options
3043
 
    # Force all strings to be unicode
3044
 
    for option in server_settings.keys():
3045
 
        if isinstance(server_settings[option], bytes):
3046
 
            server_settings[option] = (server_settings[option]
3047
 
                                       .decode("utf-8"))
3048
 
    # Force all boolean options to be boolean
3049
 
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
3050
 
                   "foreground", "zeroconf"):
3051
 
        server_settings[option] = bool(server_settings[option])
3052
 
    # Debug implies foreground
3053
 
    if server_settings["debug"]:
3054
 
        server_settings["foreground"] = True
3055
 
    # Now we have our good server settings in "server_settings"
3056
 
 
3057
 
    ##################################################################
3058
 
 
3059
 
    if (not server_settings["zeroconf"]
3060
 
        and not (server_settings["port"]
3061
 
                 or server_settings["socket"] != "")):
3062
 
        parser.error("Needs port or socket to work without Zeroconf")
3063
 
 
3064
 
    # For convenience
3065
 
    debug = server_settings["debug"]
3066
 
    debuglevel = server_settings["debuglevel"]
3067
 
    use_dbus = server_settings["use_dbus"]
3068
 
    use_ipv6 = server_settings["use_ipv6"]
3069
 
    stored_state_path = os.path.join(server_settings["statedir"],
3070
 
                                     stored_state_file)
3071
 
    foreground = server_settings["foreground"]
3072
 
    zeroconf = server_settings["zeroconf"]
3073
 
 
3074
 
    if debug:
3075
 
        initlogger(debug, logging.DEBUG)
3076
 
    else:
3077
 
        if not debuglevel:
3078
 
            initlogger(debug)
3079
 
        else:
3080
 
            level = getattr(logging, debuglevel.upper())
3081
 
            initlogger(debug, level)
3082
 
 
3083
 
    if server_settings["servicename"] != "Mandos":
3084
 
        syslogger.setFormatter(
3085
 
            logging.Formatter('Mandos ({}) [%(process)d]:'
3086
 
                              ' %(levelname)s: %(message)s'.format(
3087
 
                                  server_settings["servicename"])))
3088
 
 
3089
 
    # Parse config file with clients
3090
 
    client_config = configparser.ConfigParser(Client.client_defaults)
3091
 
    client_config.read(os.path.join(server_settings["configdir"],
3092
 
                                    "clients.conf"))
3093
 
 
3094
 
    global mandos_dbus_service
3095
 
    mandos_dbus_service = None
3096
 
 
3097
 
    socketfd = None
3098
 
    if server_settings["socket"] != "":
3099
 
        socketfd = server_settings["socket"]
3100
 
    tcp_server = MandosServer(
3101
 
        (server_settings["address"], server_settings["port"]),
3102
 
        ClientHandler,
3103
 
        interface=(server_settings["interface"] or None),
3104
 
        use_ipv6=use_ipv6,
3105
 
        gnutls_priority=server_settings["priority"],
3106
 
        use_dbus=use_dbus,
3107
 
        socketfd=socketfd)
3108
 
    if not foreground:
3109
 
        pidfilename = "/run/mandos.pid"
3110
 
        if not os.path.isdir("/run/."):
3111
 
            pidfilename = "/var/run/mandos.pid"
3112
 
        pidfile = None
3113
 
        try:
3114
 
            pidfile = codecs.open(pidfilename, "w", encoding="utf-8")
3115
 
        except IOError as e:
3116
 
            logger.error("Could not open file %r", pidfilename,
3117
 
                         exc_info=e)
3118
 
 
3119
 
    for name, group in (("_mandos", "_mandos"),
3120
 
                        ("mandos", "mandos"),
3121
 
                        ("nobody", "nogroup")):
3122
 
        try:
3123
 
            uid = pwd.getpwnam(name).pw_uid
3124
 
            gid = pwd.getpwnam(group).pw_gid
3125
 
            break
3126
 
        except KeyError:
3127
 
            continue
3128
 
    else:
3129
 
        uid = 65534
3130
 
        gid = 65534
3131
 
    try:
3132
 
        os.setgid(gid)
3133
 
        os.setuid(uid)
3134
 
        if debug:
3135
 
            logger.debug("Did setuid/setgid to {}:{}".format(uid,
3136
 
                                                             gid))
3137
 
    except OSError as error:
3138
 
        logger.warning("Failed to setuid/setgid to {}:{}: {}"
3139
 
                       .format(uid, gid, os.strerror(error.errno)))
3140
 
        if error.errno != errno.EPERM:
3141
 
            raise
3142
 
 
3143
 
    if debug:
3144
 
        # Enable all possible GnuTLS debugging
3145
 
 
3146
 
        # "Use a log level over 10 to enable all debugging options."
3147
 
        # - GnuTLS manual
3148
 
        gnutls.global_set_log_level(11)
3149
 
 
3150
 
        @gnutls.log_func
3151
 
        def debug_gnutls(level, string):
3152
 
            logger.debug("GnuTLS: %s", string[:-1])
3153
 
 
3154
 
        gnutls.global_set_log_function(debug_gnutls)
3155
 
 
3156
 
        # Redirect stdin so all checkers get /dev/null
3157
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
3158
 
        os.dup2(null, sys.stdin.fileno())
3159
 
        if null > 2:
3160
 
            os.close(null)
3161
 
 
3162
 
    # Need to fork before connecting to D-Bus
3163
 
    if not foreground:
3164
 
        # Close all input and output, do double fork, etc.
3165
 
        daemon()
3166
 
 
3167
 
    if gi.version_info < (3, 10, 2):
3168
 
        # multiprocessing will use threads, so before we use GLib we
3169
 
        # need to inform GLib that threads will be used.
3170
 
        GLib.threads_init()
3171
 
 
3172
 
    global main_loop
3173
 
    # From the Avahi example code
3174
 
    DBusGMainLoop(set_as_default=True)
3175
 
    main_loop = GLib.MainLoop()
 
425
    try:
 
426
        suffix=unicode(interval[-1])
 
427
        value=int(interval[:-1])
 
428
        if suffix == u"d":
 
429
            delta = datetime.timedelta(value)
 
430
        elif suffix == u"s":
 
431
            delta = datetime.timedelta(0, value)
 
432
        elif suffix == u"m":
 
433
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
434
        elif suffix == u"h":
 
435
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
436
        elif suffix == u"w":
 
437
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
438
        else:
 
439
            raise ValueError
 
440
    except (ValueError, IndexError):
 
441
        raise ValueError
 
442
    return delta
 
443
 
 
444
 
 
445
def add_service():
 
446
    """From the Avahi server example code"""
 
447
    global group, serviceName, serviceType, servicePort, serviceTXT, \
 
448
           domain, host
 
449
    if group is None:
 
450
        group = dbus.Interface(
 
451
                bus.get_object( avahi.DBUS_NAME,
 
452
                                server.EntryGroupNew()),
 
453
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
454
        group.connect_to_signal('StateChanged',
 
455
                                entry_group_state_changed)
 
456
    logger.debug(u"Adding service '%s' of type '%s' ...",
 
457
                 serviceName, serviceType)
 
458
    
 
459
    group.AddService(
 
460
            serviceInterface,           # interface
 
461
            avahi.PROTO_INET6,          # protocol
 
462
            dbus.UInt32(0),             # flags
 
463
            serviceName, serviceType,
 
464
            domain, host,
 
465
            dbus.UInt16(servicePort),
 
466
            avahi.string_array_to_txt_array(serviceTXT))
 
467
    group.Commit()
 
468
 
 
469
 
 
470
def remove_service():
 
471
    """From the Avahi server example code"""
 
472
    global group
 
473
    
 
474
    if not group is None:
 
475
        group.Reset()
 
476
 
 
477
 
 
478
def server_state_changed(state):
 
479
    """From the Avahi server example code"""
 
480
    if state == avahi.SERVER_COLLISION:
 
481
        logger.warning(u"Server name collision")
 
482
        remove_service()
 
483
    elif state == avahi.SERVER_RUNNING:
 
484
        add_service()
 
485
 
 
486
 
 
487
def entry_group_state_changed(state, error):
 
488
    """From the Avahi server example code"""
 
489
    global serviceName, server, rename_count
 
490
    
 
491
    logger.debug(u"state change: %i", state)
 
492
    
 
493
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
494
        logger.debug(u"Service established.")
 
495
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
496
        
 
497
        rename_count = rename_count - 1
 
498
        if rename_count > 0:
 
499
            name = server.GetAlternativeServiceName(name)
 
500
            logger.warning(u"Service name collision, "
 
501
                           u"changing name to '%s' ...", name)
 
502
            remove_service()
 
503
            add_service()
 
504
            
 
505
        else:
 
506
            logger.error(u"No suitable service name found "
 
507
                         u"after %i retries, exiting.",
 
508
                         n_rename)
 
509
            main_loop.quit()
 
510
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
511
        logger.error(u"Error in group state changed %s",
 
512
                     unicode(error))
 
513
        main_loop.quit()
 
514
        return
 
515
 
 
516
 
 
517
def if_nametoindex(interface):
 
518
    """Call the C function if_nametoindex()"""
 
519
    try:
 
520
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
521
        return libc.if_nametoindex(interface)
 
522
    except (OSError, AttributeError):
 
523
        if "struct" not in sys.modules:
 
524
            import struct
 
525
        if "fcntl" not in sys.modules:
 
526
            import fcntl
 
527
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
528
        s = socket.socket()
 
529
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
530
                            struct.pack("16s16x", interface))
 
531
        s.close()
 
532
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
533
        return interface_index
 
534
 
 
535
 
 
536
if __name__ == '__main__':
 
537
    parser = OptionParser()
 
538
    parser.add_option("-i", "--interface", type="string",
 
539
                      default=None, metavar="IF",
 
540
                      help="Bind to interface IF")
 
541
    parser.add_option("--cert", type="string", default="cert.pem",
 
542
                      metavar="FILE",
 
543
                      help="Public key certificate PEM file to use")
 
544
    parser.add_option("--key", type="string", default="key.pem",
 
545
                      metavar="FILE",
 
546
                      help="Private key PEM file to use")
 
547
    parser.add_option("--ca", type="string", default="ca.pem",
 
548
                      metavar="FILE",
 
549
                      help="Certificate Authority certificate PEM file to use")
 
550
    parser.add_option("--crl", type="string", default="crl.pem",
 
551
                      metavar="FILE",
 
552
                      help="Certificate Revokation List PEM file to use")
 
553
    parser.add_option("-p", "--port", type="int", default=None,
 
554
                      help="Port number to receive requests on")
 
555
    parser.add_option("--timeout", type="string", # Parsed later
 
556
                      default="1h",
 
557
                      help="Amount of downtime allowed for clients")
 
558
    parser.add_option("--interval", type="string", # Parsed later
 
559
                      default="5m",
 
560
                      help="How often to check that a client is up")
 
561
    parser.add_option("--check", action="store_true", default=False,
 
562
                      help="Run self-test")
 
563
    parser.add_option("--debug", action="store_true", default=False,
 
564
                      help="Debug mode")
 
565
    (options, args) = parser.parse_args()
 
566
    
 
567
    if options.check:
 
568
        import doctest
 
569
        doctest.testmod()
 
570
        sys.exit()
 
571
    
 
572
    # Parse the time arguments
 
573
    try:
 
574
        options.timeout = string_to_delta(options.timeout)
 
575
    except ValueError:
 
576
        parser.error("option --timeout: Unparseable time")
 
577
    try:
 
578
        options.interval = string_to_delta(options.interval)
 
579
    except ValueError:
 
580
        parser.error("option --interval: Unparseable time")
 
581
    
 
582
    # Parse config file
 
583
    defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
 
584
    client_config = ConfigParser.SafeConfigParser(defaults)
 
585
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
 
586
    client_config.read("mandos-clients.conf")
 
587
    
 
588
    # From the Avahi server example code
 
589
    DBusGMainLoop(set_as_default=True )
 
590
    main_loop = gobject.MainLoop()
3176
591
    bus = dbus.SystemBus()
3177
 
    # End of Avahi example code
3178
 
    if use_dbus:
3179
 
        try:
3180
 
            bus_name = dbus.service.BusName("se.recompile.Mandos",
3181
 
                                            bus,
3182
 
                                            do_not_queue=True)
3183
 
            old_bus_name = dbus.service.BusName(
3184
 
                "se.bsnet.fukt.Mandos", bus,
3185
 
                do_not_queue=True)
3186
 
        except dbus.exceptions.DBusException as e:
3187
 
            logger.error("Disabling D-Bus:", exc_info=e)
3188
 
            use_dbus = False
3189
 
            server_settings["use_dbus"] = False
3190
 
            tcp_server.use_dbus = False
3191
 
    if zeroconf:
3192
 
        protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
3193
 
        service = AvahiServiceToSyslog(
3194
 
            name=server_settings["servicename"],
3195
 
            servicetype="_mandos._tcp",
3196
 
            protocol=protocol,
3197
 
            bus=bus)
3198
 
        if server_settings["interface"]:
3199
 
            service.interface = if_nametoindex(
3200
 
                server_settings["interface"].encode("utf-8"))
3201
 
 
3202
 
    global multiprocessing_manager
3203
 
    multiprocessing_manager = multiprocessing.Manager()
3204
 
 
3205
 
    client_class = Client
3206
 
    if use_dbus:
3207
 
        client_class = functools.partial(ClientDBus, bus=bus)
3208
 
 
3209
 
    client_settings = Client.config_parser(client_config)
3210
 
    old_client_settings = {}
3211
 
    clients_data = {}
3212
 
 
3213
 
    # This is used to redirect stdout and stderr for checker processes
3214
 
    global wnull
3215
 
    wnull = open(os.devnull, "w")  # A writable /dev/null
3216
 
    # Only used if server is running in foreground but not in debug
3217
 
    # mode
3218
 
    if debug or not foreground:
3219
 
        wnull.close()
3220
 
 
3221
 
    # Get client data and settings from last running state.
3222
 
    if server_settings["restore"]:
3223
 
        try:
3224
 
            with open(stored_state_path, "rb") as stored_state:
3225
 
                if sys.version_info.major == 2:
3226
 
                    clients_data, old_client_settings = pickle.load(
3227
 
                        stored_state)
3228
 
                else:
3229
 
                    bytes_clients_data, bytes_old_client_settings = (
3230
 
                        pickle.load(stored_state, encoding="bytes"))
3231
 
                    #   Fix bytes to strings
3232
 
                    #  clients_data
3233
 
                    # .keys()
3234
 
                    clients_data = {(key.decode("utf-8")
3235
 
                                     if isinstance(key, bytes)
3236
 
                                     else key): value
3237
 
                                    for key, value in
3238
 
                                    bytes_clients_data.items()}
3239
 
                    del bytes_clients_data
3240
 
                    for key in clients_data:
3241
 
                        value = {(k.decode("utf-8")
3242
 
                                  if isinstance(k, bytes) else k): v
3243
 
                                 for k, v in
3244
 
                                 clients_data[key].items()}
3245
 
                        clients_data[key] = value
3246
 
                        # .client_structure
3247
 
                        value["client_structure"] = [
3248
 
                            (s.decode("utf-8")
3249
 
                             if isinstance(s, bytes)
3250
 
                             else s) for s in
3251
 
                            value["client_structure"]]
3252
 
                        # .name, .host, and .checker_command
3253
 
                        for k in ("name", "host", "checker_command"):
3254
 
                            if isinstance(value[k], bytes):
3255
 
                                value[k] = value[k].decode("utf-8")
3256
 
                        if "key_id" not in value:
3257
 
                            value["key_id"] = ""
3258
 
                        elif "fingerprint" not in value:
3259
 
                            value["fingerprint"] = ""
3260
 
                    #  old_client_settings
3261
 
                    # .keys()
3262
 
                    old_client_settings = {
3263
 
                        (key.decode("utf-8")
3264
 
                         if isinstance(key, bytes)
3265
 
                         else key): value
3266
 
                        for key, value in
3267
 
                        bytes_old_client_settings.items()}
3268
 
                    del bytes_old_client_settings
3269
 
                    # .host and .checker_command
3270
 
                    for value in old_client_settings.values():
3271
 
                        for attribute in ("host", "checker_command"):
3272
 
                            if isinstance(value[attribute], bytes):
3273
 
                                value[attribute] = (value[attribute]
3274
 
                                                    .decode("utf-8"))
3275
 
            os.remove(stored_state_path)
3276
 
        except IOError as e:
3277
 
            if e.errno == errno.ENOENT:
3278
 
                logger.warning("Could not load persistent state:"
3279
 
                               " {}".format(os.strerror(e.errno)))
3280
 
            else:
3281
 
                logger.critical("Could not load persistent state:",
3282
 
                                exc_info=e)
3283
 
                raise
3284
 
        except EOFError as e:
3285
 
            logger.warning("Could not load persistent state: "
3286
 
                           "EOFError:",
3287
 
                           exc_info=e)
3288
 
 
3289
 
    with PGPEngine() as pgp:
3290
 
        for client_name, client in clients_data.items():
3291
 
            # Skip removed clients
3292
 
            if client_name not in client_settings:
3293
 
                continue
3294
 
 
3295
 
            # Decide which value to use after restoring saved state.
3296
 
            # We have three different values: Old config file,
3297
 
            # new config file, and saved state.
3298
 
            # New config value takes precedence if it differs from old
3299
 
            # config value, otherwise use saved state.
3300
 
            for name, value in client_settings[client_name].items():
3301
 
                try:
3302
 
                    # For each value in new config, check if it
3303
 
                    # differs from the old config value (Except for
3304
 
                    # the "secret" attribute)
3305
 
                    if (name != "secret"
3306
 
                        and (value !=
3307
 
                             old_client_settings[client_name][name])):
3308
 
                        client[name] = value
3309
 
                except KeyError:
3310
 
                    pass
3311
 
 
3312
 
            # Clients who has passed its expire date can still be
3313
 
            # enabled if its last checker was successful.  A Client
3314
 
            # whose checker succeeded before we stored its state is
3315
 
            # assumed to have successfully run all checkers during
3316
 
            # downtime.
3317
 
            if client["enabled"]:
3318
 
                if datetime.datetime.utcnow() >= client["expires"]:
3319
 
                    if not client["last_checked_ok"]:
3320
 
                        logger.warning(
3321
 
                            "disabling client {} - Client never "
3322
 
                            "performed a successful checker".format(
3323
 
                                client_name))
3324
 
                        client["enabled"] = False
3325
 
                    elif client["last_checker_status"] != 0:
3326
 
                        logger.warning(
3327
 
                            "disabling client {} - Client last"
3328
 
                            " checker failed with error code"
3329
 
                            " {}".format(
3330
 
                                client_name,
3331
 
                                client["last_checker_status"]))
3332
 
                        client["enabled"] = False
3333
 
                    else:
3334
 
                        client["expires"] = (
3335
 
                            datetime.datetime.utcnow()
3336
 
                            + client["timeout"])
3337
 
                        logger.debug("Last checker succeeded,"
3338
 
                                     " keeping {} enabled".format(
3339
 
                                         client_name))
3340
 
            try:
3341
 
                client["secret"] = pgp.decrypt(
3342
 
                    client["encrypted_secret"],
3343
 
                    client_settings[client_name]["secret"])
3344
 
            except PGPError:
3345
 
                # If decryption fails, we use secret from new settings
3346
 
                logger.debug("Failed to decrypt {} old secret".format(
3347
 
                    client_name))
3348
 
                client["secret"] = (client_settings[client_name]
3349
 
                                    ["secret"])
3350
 
 
3351
 
    # Add/remove clients based on new changes made to config
3352
 
    for client_name in (set(old_client_settings)
3353
 
                        - set(client_settings)):
3354
 
        del clients_data[client_name]
3355
 
    for client_name in (set(client_settings)
3356
 
                        - set(old_client_settings)):
3357
 
        clients_data[client_name] = client_settings[client_name]
3358
 
 
3359
 
    # Create all client objects
3360
 
    for client_name, client in clients_data.items():
3361
 
        tcp_server.clients[client_name] = client_class(
3362
 
            name=client_name,
3363
 
            settings=client,
3364
 
            server_settings=server_settings)
3365
 
 
3366
 
    if not tcp_server.clients:
3367
 
        logger.warning("No clients defined")
3368
 
 
3369
 
    if not foreground:
3370
 
        if pidfile is not None:
3371
 
            pid = os.getpid()
3372
 
            try:
3373
 
                with pidfile:
3374
 
                    print(pid, file=pidfile)
3375
 
            except IOError:
3376
 
                logger.error("Could not write to file %r with PID %d",
3377
 
                             pidfilename, pid)
3378
 
        del pidfile
3379
 
        del pidfilename
3380
 
 
3381
 
    for termsig in (signal.SIGHUP, signal.SIGTERM):
3382
 
        GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,
3383
 
                             lambda: main_loop.quit() and False)
3384
 
 
3385
 
    if use_dbus:
3386
 
 
3387
 
        @alternate_dbus_interfaces(
3388
 
            {"se.recompile.Mandos": "se.bsnet.fukt.Mandos"})
3389
 
        class MandosDBusService(DBusObjectWithObjectManager):
3390
 
            """A D-Bus proxy object"""
3391
 
 
3392
 
            def __init__(self):
3393
 
                dbus.service.Object.__init__(self, bus, "/")
3394
 
 
3395
 
            _interface = "se.recompile.Mandos"
3396
 
 
3397
 
            @dbus.service.signal(_interface, signature="o")
3398
 
            def ClientAdded(self, objpath):
3399
 
                "D-Bus signal"
3400
 
                pass
3401
 
 
3402
 
            @dbus.service.signal(_interface, signature="ss")
3403
 
            def ClientNotFound(self, key_id, address):
3404
 
                "D-Bus signal"
3405
 
                pass
3406
 
 
3407
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3408
 
                               "true"})
3409
 
            @dbus.service.signal(_interface, signature="os")
3410
 
            def ClientRemoved(self, objpath, name):
3411
 
                "D-Bus signal"
3412
 
                pass
3413
 
 
3414
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3415
 
                               "true"})
3416
 
            @dbus.service.method(_interface, out_signature="ao")
3417
 
            def GetAllClients(self):
3418
 
                "D-Bus method"
3419
 
                return dbus.Array(c.dbus_object_path for c in
3420
 
                                  tcp_server.clients.values())
3421
 
 
3422
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3423
 
                               "true"})
3424
 
            @dbus.service.method(_interface,
3425
 
                                 out_signature="a{oa{sv}}")
3426
 
            def GetAllClientsWithProperties(self):
3427
 
                "D-Bus method"
3428
 
                return dbus.Dictionary(
3429
 
                    {c.dbus_object_path: c.GetAll(
3430
 
                        "se.recompile.Mandos.Client")
3431
 
                     for c in tcp_server.clients.values()},
3432
 
                    signature="oa{sv}")
3433
 
 
3434
 
            @dbus.service.method(_interface, in_signature="o")
3435
 
            def RemoveClient(self, object_path):
3436
 
                "D-Bus method"
3437
 
                for c in tcp_server.clients.values():
3438
 
                    if c.dbus_object_path == object_path:
3439
 
                        del tcp_server.clients[c.name]
3440
 
                        c.remove_from_connection()
3441
 
                        # Don't signal the disabling
3442
 
                        c.disable(quiet=True)
3443
 
                        # Emit D-Bus signal for removal
3444
 
                        self.client_removed_signal(c)
3445
 
                        return
3446
 
                raise KeyError(object_path)
3447
 
 
3448
 
            del _interface
3449
 
 
3450
 
            @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
3451
 
                                 out_signature="a{oa{sa{sv}}}")
3452
 
            def GetManagedObjects(self):
3453
 
                """D-Bus method"""
3454
 
                return dbus.Dictionary(
3455
 
                    {client.dbus_object_path:
3456
 
                     dbus.Dictionary(
3457
 
                         {interface: client.GetAll(interface)
3458
 
                          for interface in
3459
 
                          client._get_all_interface_names()})
3460
 
                     for client in tcp_server.clients.values()})
3461
 
 
3462
 
            def client_added_signal(self, client):
3463
 
                """Send the new standard signal and the old signal"""
3464
 
                if use_dbus:
3465
 
                    # New standard signal
3466
 
                    self.InterfacesAdded(
3467
 
                        client.dbus_object_path,
3468
 
                        dbus.Dictionary(
3469
 
                            {interface: client.GetAll(interface)
3470
 
                             for interface in
3471
 
                             client._get_all_interface_names()}))
3472
 
                    # Old signal
3473
 
                    self.ClientAdded(client.dbus_object_path)
3474
 
 
3475
 
            def client_removed_signal(self, client):
3476
 
                """Send the new standard signal and the old signal"""
3477
 
                if use_dbus:
3478
 
                    # New standard signal
3479
 
                    self.InterfacesRemoved(
3480
 
                        client.dbus_object_path,
3481
 
                        client._get_all_interface_names())
3482
 
                    # Old signal
3483
 
                    self.ClientRemoved(client.dbus_object_path,
3484
 
                                       client.name)
3485
 
 
3486
 
        mandos_dbus_service = MandosDBusService()
3487
 
 
3488
 
    # Save modules to variables to exempt the modules from being
3489
 
    # unloaded before the function registered with atexit() is run.
3490
 
    mp = multiprocessing
3491
 
    wn = wnull
3492
 
 
3493
 
    def cleanup():
3494
 
        "Cleanup function; run on exit"
3495
 
        if zeroconf:
3496
 
            service.cleanup()
3497
 
 
3498
 
        mp.active_children()
3499
 
        wn.close()
3500
 
        if not (tcp_server.clients or client_settings):
3501
 
            return
3502
 
 
3503
 
        # Store client before exiting. Secrets are encrypted with key
3504
 
        # based on what config file has. If config file is
3505
 
        # removed/edited, old secret will thus be unrecovable.
3506
 
        clients = {}
3507
 
        with PGPEngine() as pgp:
3508
 
            for client in tcp_server.clients.values():
3509
 
                key = client_settings[client.name]["secret"]
3510
 
                client.encrypted_secret = pgp.encrypt(client.secret,
3511
 
                                                      key)
3512
 
                client_dict = {}
3513
 
 
3514
 
                # A list of attributes that can not be pickled
3515
 
                # + secret.
3516
 
                exclude = {"bus", "changedstate", "secret",
3517
 
                           "checker", "server_settings"}
3518
 
                for name, typ in inspect.getmembers(dbus.service
3519
 
                                                    .Object):
3520
 
                    exclude.add(name)
3521
 
 
3522
 
                client_dict["encrypted_secret"] = (client
3523
 
                                                   .encrypted_secret)
3524
 
                for attr in client.client_structure:
3525
 
                    if attr not in exclude:
3526
 
                        client_dict[attr] = getattr(client, attr)
3527
 
 
3528
 
                clients[client.name] = client_dict
3529
 
                del client_settings[client.name]["secret"]
3530
 
 
3531
 
        try:
3532
 
            with tempfile.NamedTemporaryFile(
3533
 
                    mode='wb',
3534
 
                    suffix=".pickle",
3535
 
                    prefix='clients-',
3536
 
                    dir=os.path.dirname(stored_state_path),
3537
 
                    delete=False) as stored_state:
3538
 
                pickle.dump((clients, client_settings), stored_state,
3539
 
                            protocol=2)
3540
 
                tempname = stored_state.name
3541
 
            os.rename(tempname, stored_state_path)
3542
 
        except (IOError, OSError) as e:
3543
 
            if not debug:
3544
 
                try:
3545
 
                    os.remove(tempname)
3546
 
                except NameError:
3547
 
                    pass
3548
 
            if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
3549
 
                logger.warning("Could not save persistent state: {}"
3550
 
                               .format(os.strerror(e.errno)))
3551
 
            else:
3552
 
                logger.warning("Could not save persistent state:",
3553
 
                               exc_info=e)
3554
 
                raise
3555
 
 
3556
 
        # Delete all clients, and settings from config
3557
 
        while tcp_server.clients:
3558
 
            name, client = tcp_server.clients.popitem()
3559
 
            if use_dbus:
3560
 
                client.remove_from_connection()
3561
 
            # Don't signal the disabling
3562
 
            client.disable(quiet=True)
3563
 
            # Emit D-Bus signal for removal
3564
 
            if use_dbus:
3565
 
                mandos_dbus_service.client_removed_signal(client)
3566
 
        client_settings.clear()
3567
 
 
3568
 
    atexit.register(cleanup)
3569
 
 
3570
 
    for client in tcp_server.clients.values():
3571
 
        if use_dbus:
3572
 
            # Emit D-Bus signal for adding
3573
 
            mandos_dbus_service.client_added_signal(client)
3574
 
        # Need to initiate checking of clients
3575
 
        if client.enabled:
3576
 
            client.init_checker()
3577
 
 
3578
 
    tcp_server.enable()
3579
 
    tcp_server.server_activate()
3580
 
 
3581
 
    # Find out what port we got
3582
 
    if zeroconf:
3583
 
        service.port = tcp_server.socket.getsockname()[1]
3584
 
    if use_ipv6:
3585
 
        logger.info("Now listening on address %r, port %d,"
3586
 
                    " flowinfo %d, scope_id %d",
3587
 
                    *tcp_server.socket.getsockname())
3588
 
    else:                       # IPv4
3589
 
        logger.info("Now listening on address %r, port %d",
3590
 
                    *tcp_server.socket.getsockname())
3591
 
 
3592
 
    # service.interface = tcp_server.socket.getsockname()[3]
3593
 
 
 
592
    server = dbus.Interface(
 
593
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
594
            avahi.DBUS_INTERFACE_SERVER )
 
595
    # End of Avahi example code
 
596
    
 
597
    debug = options.debug
 
598
    
 
599
    clients = Set()
 
600
    def remove_from_clients(client):
 
601
        clients.remove(client)
 
602
        if not clients:
 
603
            logger.debug(u"No clients left, exiting")
 
604
            main_loop.quit()
 
605
    
 
606
    clients.update(Set(Client(name=section, options=options,
 
607
                              stop_hook = remove_from_clients,
 
608
                              **(dict(client_config\
 
609
                                      .items(section))))
 
610
                       for section in client_config.sections()))
 
611
    for client in clients:
 
612
        client.start()
 
613
    
 
614
    tcp_server = IPv6_TCPServer((None, options.port),
 
615
                                tcp_handler,
 
616
                                options=options,
 
617
                                clients=clients)
 
618
    # Find out what random port we got
 
619
    servicePort = tcp_server.socket.getsockname()[1]
 
620
    logger.debug(u"Now listening on port %d", servicePort)
 
621
    
 
622
    if options.interface is not None:
 
623
        serviceInterface = if_nametoindex(options.interface)
 
624
    
 
625
    # From the Avahi server example code
 
626
    server.connect_to_signal("StateChanged", server_state_changed)
 
627
    server_state_changed(server.GetState())
 
628
    # End of Avahi example code
 
629
    
 
630
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
631
                         lambda *args, **kwargs:
 
632
                         tcp_server.handle_request(*args[2:],
 
633
                                                   **kwargs) or True)
3594
634
    try:
3595
 
        if zeroconf:
3596
 
            # From the Avahi example code
3597
 
            try:
3598
 
                service.activate()
3599
 
            except dbus.exceptions.DBusException as error:
3600
 
                logger.critical("D-Bus Exception", exc_info=error)
3601
 
                cleanup()
3602
 
                sys.exit(1)
3603
 
            # End of Avahi example code
3604
 
 
3605
 
        GLib.io_add_watch(
3606
 
            GLib.IOChannel.unix_new(tcp_server.fileno()),
3607
 
            GLib.PRIORITY_DEFAULT, GLib.IO_IN,
3608
 
            lambda *args, **kwargs: (tcp_server.handle_request
3609
 
                                     (*args[2:], **kwargs) or True))
3610
 
 
3611
 
        logger.debug("Starting main loop")
3612
635
        main_loop.run()
3613
 
    except AvahiError as error:
3614
 
        logger.critical("Avahi Error", exc_info=error)
3615
 
        cleanup()
3616
 
        sys.exit(1)
3617
636
    except KeyboardInterrupt:
3618
 
        if debug:
3619
 
            print("", file=sys.stderr)
3620
 
        logger.debug("Server received KeyboardInterrupt")
3621
 
    logger.debug("Server exiting")
3622
 
    # Must run before the D-Bus bus name gets deregistered
3623
 
    cleanup()
3624
 
 
3625
 
 
3626
 
def should_only_run_tests():
3627
 
    parser = argparse.ArgumentParser(add_help=False)
3628
 
    parser.add_argument("--check", action='store_true')
3629
 
    args, unknown_args = parser.parse_known_args()
3630
 
    run_tests = args.check
3631
 
    if run_tests:
3632
 
        # Remove --check argument from sys.argv
3633
 
        sys.argv[1:] = unknown_args
3634
 
    return run_tests
3635
 
 
3636
 
# Add all tests from doctest strings
3637
 
def load_tests(loader, tests, none):
3638
 
    import doctest
3639
 
    tests.addTests(doctest.DocTestSuite())
3640
 
    return tests
3641
 
 
3642
 
if __name__ == '__main__':
3643
 
    try:
3644
 
        if should_only_run_tests():
3645
 
            # Call using ./mandos --check [--verbose]
3646
 
            unittest.main()
3647
 
        else:
3648
 
            main()
3649
 
    finally:
3650
 
        logging.shutdown()
 
637
        print
 
638
    
 
639
    # Cleanup here
 
640
 
 
641
    # From the Avahi server example code
 
642
    if not group is None:
 
643
        group.Free()
 
644
    # End of Avahi example code
 
645
    
 
646
    for client in clients:
 
647
        client.stop_hook = None
 
648
        client.stop()