/mandos/trunk

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  • Committer: Teddy Hogeborn
  • Date: 2009-02-09 02:13:58 UTC
  • Revision ID: teddy@fukt.bsnet.se-20090209021358-6nrlc91oi08hn5hb
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1
#!/usr/bin/python
2
2
# -*- mode: python; coding: utf-8 -*-
3
 
#
 
3
4
4
# Mandos server - give out binary blobs to connecting clients.
5
 
#
 
5
6
6
# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add", "remove", "server_state_changed",
10
 
# "entry_group_state_changed", "cleanup", and "activate" in the
11
 
# "AvahiService" class, and some lines in "main".
12
 
#
 
9
# methods "add" and "remove" in the "AvahiService" class, the
 
10
# "server_state_changed" and "entry_group_state_changed" functions,
 
11
# and some lines in "main".
 
12
13
13
# Everything else is
14
 
# Copyright © 2008-2016 Teddy Hogeborn
15
 
# Copyright © 2008-2016 Björn Påhlsson
16
 
#
 
14
# Copyright © 2008,2009 Teddy Hogeborn
 
15
# Copyright © 2008,2009 Björn Påhlsson
 
16
17
17
# This program is free software: you can redistribute it and/or modify
18
18
# it under the terms of the GNU General Public License as published by
19
19
# the Free Software Foundation, either version 3 of the License, or
23
23
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
24
24
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25
25
#     GNU General Public License for more details.
26
 
#
 
26
27
27
# You should have received a copy of the GNU General Public License
28
28
# along with this program.  If not, see
29
29
# <http://www.gnu.org/licenses/>.
30
 
#
31
 
# Contact the authors at <mandos@recompile.se>.
32
 
#
33
 
 
34
 
from __future__ import (division, absolute_import, print_function,
35
 
                        unicode_literals)
36
 
 
37
 
try:
38
 
    from future_builtins import *
39
 
except ImportError:
40
 
    pass
41
 
 
42
 
try:
43
 
    import SocketServer as socketserver
44
 
except ImportError:
45
 
    import socketserver
 
30
 
31
# Contact the authors at <mandos@fukt.bsnet.se>.
 
32
 
33
 
 
34
from __future__ import division, with_statement, absolute_import
 
35
 
 
36
import SocketServer
46
37
import socket
47
 
import argparse
 
38
import optparse
48
39
import datetime
49
40
import errno
50
 
try:
51
 
    import ConfigParser as configparser
52
 
except ImportError:
53
 
    import configparser
 
41
import gnutls.crypto
 
42
import gnutls.connection
 
43
import gnutls.errors
 
44
import gnutls.library.functions
 
45
import gnutls.library.constants
 
46
import gnutls.library.types
 
47
import ConfigParser
54
48
import sys
55
49
import re
56
50
import os
57
51
import signal
 
52
from sets import Set
58
53
import subprocess
59
54
import atexit
60
55
import stat
61
56
import logging
62
57
import logging.handlers
63
58
import pwd
64
 
import contextlib
65
 
import struct
66
 
import fcntl
67
 
import functools
68
 
try:
69
 
    import cPickle as pickle
70
 
except ImportError:
71
 
    import pickle
72
 
import multiprocessing
73
 
import types
74
 
import binascii
75
 
import tempfile
76
 
import itertools
77
 
import collections
78
 
import codecs
 
59
from contextlib import closing
79
60
 
80
61
import dbus
81
62
import dbus.service
82
 
from gi.repository import GLib
 
63
import gobject
 
64
import avahi
83
65
from dbus.mainloop.glib import DBusGMainLoop
84
66
import ctypes
85
67
import ctypes.util
86
 
import xml.dom.minidom
87
 
import inspect
88
 
 
89
 
# Try to find the value of SO_BINDTODEVICE:
90
 
try:
91
 
    # This is where SO_BINDTODEVICE is in Python 3.3 (or 3.4?) and
92
 
    # newer, and it is also the most natural place for it:
93
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
94
 
except AttributeError:
95
 
    try:
96
 
        # This is where SO_BINDTODEVICE was up to and including Python
97
 
        # 2.6, and also 3.2:
98
 
        from IN import SO_BINDTODEVICE
99
 
    except ImportError:
100
 
        # In Python 2.7 it seems to have been removed entirely.
101
 
        # Try running the C preprocessor:
102
 
        try:
103
 
            cc = subprocess.Popen(["cc", "--language=c", "-E",
104
 
                                   "/dev/stdin"],
105
 
                                  stdin=subprocess.PIPE,
106
 
                                  stdout=subprocess.PIPE)
107
 
            stdout = cc.communicate(
108
 
                "#include <sys/socket.h>\nSO_BINDTODEVICE\n")[0]
109
 
            SO_BINDTODEVICE = int(stdout.splitlines()[-1])
110
 
        except (OSError, ValueError, IndexError):
111
 
            # No value found
112
 
            SO_BINDTODEVICE = None
113
 
 
114
 
if sys.version_info.major == 2:
115
 
    str = unicode
116
 
 
117
 
version = "1.7.14"
118
 
stored_state_file = "clients.pickle"
119
 
 
120
 
logger = logging.getLogger()
121
 
syslogger = None
122
 
 
123
 
try:
124
 
    if_nametoindex = ctypes.cdll.LoadLibrary(
125
 
        ctypes.util.find_library("c")).if_nametoindex
126
 
except (OSError, AttributeError):
127
 
 
128
 
    def if_nametoindex(interface):
129
 
        "Get an interface index the hard way, i.e. using fcntl()"
130
 
        SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
131
 
        with contextlib.closing(socket.socket()) as s:
132
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
133
 
                                struct.pack(b"16s16x", interface))
134
 
        interface_index = struct.unpack("I", ifreq[16:20])[0]
135
 
        return interface_index
136
 
 
137
 
 
138
 
def copy_function(func):
139
 
    """Make a copy of a function"""
140
 
    if sys.version_info.major == 2:
141
 
        return types.FunctionType(func.func_code,
142
 
                                  func.func_globals,
143
 
                                  func.func_name,
144
 
                                  func.func_defaults,
145
 
                                  func.func_closure)
146
 
    else:
147
 
        return types.FunctionType(func.__code__,
148
 
                                  func.__globals__,
149
 
                                  func.__name__,
150
 
                                  func.__defaults__,
151
 
                                  func.__closure__)
152
 
 
153
 
 
154
 
def initlogger(debug, level=logging.WARNING):
155
 
    """init logger and add loglevel"""
156
 
 
157
 
    global syslogger
158
 
    syslogger = (logging.handlers.SysLogHandler(
159
 
        facility=logging.handlers.SysLogHandler.LOG_DAEMON,
160
 
        address="/dev/log"))
161
 
    syslogger.setFormatter(logging.Formatter
162
 
                           ('Mandos [%(process)d]: %(levelname)s:'
163
 
                            ' %(message)s'))
164
 
    logger.addHandler(syslogger)
165
 
 
166
 
    if debug:
167
 
        console = logging.StreamHandler()
168
 
        console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
169
 
                                               ' [%(process)d]:'
170
 
                                               ' %(levelname)s:'
171
 
                                               ' %(message)s'))
172
 
        logger.addHandler(console)
173
 
    logger.setLevel(level)
174
 
 
175
 
 
176
 
class PGPError(Exception):
177
 
    """Exception if encryption/decryption fails"""
178
 
    pass
179
 
 
180
 
 
181
 
class PGPEngine(object):
182
 
    """A simple class for OpenPGP symmetric encryption & decryption"""
183
 
 
184
 
    def __init__(self):
185
 
        self.tempdir = tempfile.mkdtemp(prefix="mandos-")
186
 
        self.gpg = "gpg"
187
 
        try:
188
 
            output = subprocess.check_output(["gpgconf"])
189
 
            for line in output.splitlines():
190
 
                name, text, path = line.split(b":")
191
 
                if name == "gpg":
192
 
                    self.gpg = path
193
 
                    break
194
 
        except OSError as e:
195
 
            if e.errno != errno.ENOENT:
196
 
                raise
197
 
        self.gnupgargs = ['--batch',
198
 
                          '--homedir', self.tempdir,
199
 
                          '--force-mdc',
200
 
                          '--quiet']
201
 
        # Only GPG version 1 has the --no-use-agent option.
202
 
        if self.gpg == "gpg" or self.gpg.endswith("/gpg"):
203
 
            self.gnupgargs.append("--no-use-agent")
204
 
 
205
 
    def __enter__(self):
206
 
        return self
207
 
 
208
 
    def __exit__(self, exc_type, exc_value, traceback):
209
 
        self._cleanup()
210
 
        return False
211
 
 
212
 
    def __del__(self):
213
 
        self._cleanup()
214
 
 
215
 
    def _cleanup(self):
216
 
        if self.tempdir is not None:
217
 
            # Delete contents of tempdir
218
 
            for root, dirs, files in os.walk(self.tempdir,
219
 
                                             topdown=False):
220
 
                for filename in files:
221
 
                    os.remove(os.path.join(root, filename))
222
 
                for dirname in dirs:
223
 
                    os.rmdir(os.path.join(root, dirname))
224
 
            # Remove tempdir
225
 
            os.rmdir(self.tempdir)
226
 
            self.tempdir = None
227
 
 
228
 
    def password_encode(self, password):
229
 
        # Passphrase can not be empty and can not contain newlines or
230
 
        # NUL bytes.  So we prefix it and hex encode it.
231
 
        encoded = b"mandos" + binascii.hexlify(password)
232
 
        if len(encoded) > 2048:
233
 
            # GnuPG can't handle long passwords, so encode differently
234
 
            encoded = (b"mandos" + password.replace(b"\\", b"\\\\")
235
 
                       .replace(b"\n", b"\\n")
236
 
                       .replace(b"\0", b"\\x00"))
237
 
        return encoded
238
 
 
239
 
    def encrypt(self, data, password):
240
 
        passphrase = self.password_encode(password)
241
 
        with tempfile.NamedTemporaryFile(
242
 
                dir=self.tempdir) as passfile:
243
 
            passfile.write(passphrase)
244
 
            passfile.flush()
245
 
            proc = subprocess.Popen([self.gpg, '--symmetric',
246
 
                                     '--passphrase-file',
247
 
                                     passfile.name]
248
 
                                    + self.gnupgargs,
249
 
                                    stdin=subprocess.PIPE,
250
 
                                    stdout=subprocess.PIPE,
251
 
                                    stderr=subprocess.PIPE)
252
 
            ciphertext, err = proc.communicate(input=data)
253
 
        if proc.returncode != 0:
254
 
            raise PGPError(err)
255
 
        return ciphertext
256
 
 
257
 
    def decrypt(self, data, password):
258
 
        passphrase = self.password_encode(password)
259
 
        with tempfile.NamedTemporaryFile(
260
 
                dir=self.tempdir) as passfile:
261
 
            passfile.write(passphrase)
262
 
            passfile.flush()
263
 
            proc = subprocess.Popen([self.gpg, '--decrypt',
264
 
                                     '--passphrase-file',
265
 
                                     passfile.name]
266
 
                                    + self.gnupgargs,
267
 
                                    stdin=subprocess.PIPE,
268
 
                                    stdout=subprocess.PIPE,
269
 
                                    stderr=subprocess.PIPE)
270
 
            decrypted_plaintext, err = proc.communicate(input=data)
271
 
        if proc.returncode != 0:
272
 
            raise PGPError(err)
273
 
        return decrypted_plaintext
274
 
 
275
 
 
276
 
# Pretend that we have an Avahi module
277
 
class Avahi(object):
278
 
    """This isn't so much a class as it is a module-like namespace.
279
 
    It is instantiated once, and simulates having an Avahi module."""
280
 
    IF_UNSPEC = -1               # avahi-common/address.h
281
 
    PROTO_UNSPEC = -1            # avahi-common/address.h
282
 
    PROTO_INET = 0               # avahi-common/address.h
283
 
    PROTO_INET6 = 1              # avahi-common/address.h
284
 
    DBUS_NAME = "org.freedesktop.Avahi"
285
 
    DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"
286
 
    DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"
287
 
    DBUS_PATH_SERVER = "/"
288
 
 
289
 
    def string_array_to_txt_array(self, t):
290
 
        return dbus.Array((dbus.ByteArray(s.encode("utf-8"))
291
 
                           for s in t), signature="ay")
292
 
    ENTRY_GROUP_ESTABLISHED = 2  # avahi-common/defs.h
293
 
    ENTRY_GROUP_COLLISION = 3    # avahi-common/defs.h
294
 
    ENTRY_GROUP_FAILURE = 4      # avahi-common/defs.h
295
 
    SERVER_INVALID = 0           # avahi-common/defs.h
296
 
    SERVER_REGISTERING = 1       # avahi-common/defs.h
297
 
    SERVER_RUNNING = 2           # avahi-common/defs.h
298
 
    SERVER_COLLISION = 3         # avahi-common/defs.h
299
 
    SERVER_FAILURE = 4           # avahi-common/defs.h
300
 
avahi = Avahi()
301
 
 
 
68
 
 
69
version = "1.0.5"
 
70
 
 
71
logger = logging.Logger('mandos')
 
72
syslogger = (logging.handlers.SysLogHandler
 
73
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
74
              address = "/dev/log"))
 
75
syslogger.setFormatter(logging.Formatter
 
76
                       ('Mandos [%(process)d]: %(levelname)s:'
 
77
                        ' %(message)s'))
 
78
logger.addHandler(syslogger)
 
79
 
 
80
console = logging.StreamHandler()
 
81
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
 
82
                                       ' %(levelname)s: %(message)s'))
 
83
logger.addHandler(console)
302
84
 
303
85
class AvahiError(Exception):
304
86
    def __init__(self, value, *args, **kwargs):
305
87
        self.value = value
306
 
        return super(AvahiError, self).__init__(value, *args,
307
 
                                                **kwargs)
308
 
 
 
88
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
89
    def __unicode__(self):
 
90
        return unicode(repr(self.value))
309
91
 
310
92
class AvahiServiceError(AvahiError):
311
93
    pass
312
94
 
313
 
 
314
95
class AvahiGroupError(AvahiError):
315
96
    pass
316
97
 
317
98
 
318
99
class AvahiService(object):
319
100
    """An Avahi (Zeroconf) service.
320
 
 
321
101
    Attributes:
322
102
    interface: integer; avahi.IF_UNSPEC or an interface index.
323
103
               Used to optionally bind to the specified interface.
324
104
    name: string; Example: 'Mandos'
325
105
    type: string; Example: '_mandos._tcp'.
326
 
     See <https://www.iana.org/assignments/service-names-port-numbers>
 
106
                  See <http://www.dns-sd.org/ServiceTypes.html>
327
107
    port: integer; what port to announce
328
108
    TXT: list of strings; TXT record for the service
329
109
    domain: string; Domain to publish on, default to .local if empty.
331
111
    max_renames: integer; maximum number of renames
332
112
    rename_count: integer; counter so we only rename after collisions
333
113
                  a sensible number of times
334
 
    group: D-Bus Entry Group
335
 
    server: D-Bus Server
336
 
    bus: dbus.SystemBus()
337
114
    """
338
 
 
339
 
    def __init__(self,
340
 
                 interface=avahi.IF_UNSPEC,
341
 
                 name=None,
342
 
                 servicetype=None,
343
 
                 port=None,
344
 
                 TXT=None,
345
 
                 domain="",
346
 
                 host="",
347
 
                 max_renames=32768,
348
 
                 protocol=avahi.PROTO_UNSPEC,
349
 
                 bus=None):
 
115
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
 
116
                 servicetype = None, port = None, TXT = None,
 
117
                 domain = "", host = "", max_renames = 32768):
350
118
        self.interface = interface
351
119
        self.name = name
352
120
        self.type = servicetype
356
124
        self.host = host
357
125
        self.rename_count = 0
358
126
        self.max_renames = max_renames
359
 
        self.protocol = protocol
360
 
        self.group = None       # our entry group
361
 
        self.server = None
362
 
        self.bus = bus
363
 
        self.entry_group_state_changed_match = None
364
 
 
365
 
    def rename(self, remove=True):
 
127
    def rename(self):
366
128
        """Derived from the Avahi example code"""
367
129
        if self.rename_count >= self.max_renames:
368
 
            logger.critical("No suitable Zeroconf service name found"
369
 
                            " after %i retries, exiting.",
 
130
            logger.critical(u"No suitable Zeroconf service name found"
 
131
                            u" after %i retries, exiting.",
370
132
                            self.rename_count)
371
 
            raise AvahiServiceError("Too many renames")
372
 
        self.name = str(
373
 
            self.server.GetAlternativeServiceName(self.name))
 
133
            raise AvahiServiceError(u"Too many renames")
 
134
        self.name = server.GetAlternativeServiceName(self.name)
 
135
        logger.info(u"Changing Zeroconf service name to %r ...",
 
136
                    str(self.name))
 
137
        syslogger.setFormatter(logging.Formatter
 
138
                               ('Mandos (%s): %%(levelname)s:'
 
139
                                ' %%(message)s' % self.name))
 
140
        self.remove()
 
141
        self.add()
374
142
        self.rename_count += 1
375
 
        logger.info("Changing Zeroconf service name to %r ...",
376
 
                    self.name)
377
 
        if remove:
378
 
            self.remove()
379
 
        try:
380
 
            self.add()
381
 
        except dbus.exceptions.DBusException as error:
382
 
            if (error.get_dbus_name()
383
 
                == "org.freedesktop.Avahi.CollisionError"):
384
 
                logger.info("Local Zeroconf service name collision.")
385
 
                return self.rename(remove=False)
386
 
            else:
387
 
                logger.critical("D-Bus Exception", exc_info=error)
388
 
                self.cleanup()
389
 
                os._exit(1)
390
 
 
391
143
    def remove(self):
392
144
        """Derived from the Avahi example code"""
393
 
        if self.entry_group_state_changed_match is not None:
394
 
            self.entry_group_state_changed_match.remove()
395
 
            self.entry_group_state_changed_match = None
396
 
        if self.group is not None:
397
 
            self.group.Reset()
398
 
 
 
145
        if group is not None:
 
146
            group.Reset()
399
147
    def add(self):
400
148
        """Derived from the Avahi example code"""
401
 
        self.remove()
402
 
        if self.group is None:
403
 
            self.group = dbus.Interface(
404
 
                self.bus.get_object(avahi.DBUS_NAME,
405
 
                                    self.server.EntryGroupNew()),
406
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
407
 
        self.entry_group_state_changed_match = (
408
 
            self.group.connect_to_signal(
409
 
                'StateChanged', self.entry_group_state_changed))
410
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
411
 
                     self.name, self.type)
412
 
        self.group.AddService(
413
 
            self.interface,
414
 
            self.protocol,
415
 
            dbus.UInt32(0),     # flags
416
 
            self.name, self.type,
417
 
            self.domain, self.host,
418
 
            dbus.UInt16(self.port),
419
 
            avahi.string_array_to_txt_array(self.TXT))
420
 
        self.group.Commit()
421
 
 
422
 
    def entry_group_state_changed(self, state, error):
423
 
        """Derived from the Avahi example code"""
424
 
        logger.debug("Avahi entry group state change: %i", state)
425
 
 
426
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
427
 
            logger.debug("Zeroconf service established.")
428
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
429
 
            logger.info("Zeroconf service name collision.")
430
 
            self.rename()
431
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
432
 
            logger.critical("Avahi: Error in group state changed %s",
433
 
                            str(error))
434
 
            raise AvahiGroupError("State changed: {!s}".format(error))
435
 
 
436
 
    def cleanup(self):
437
 
        """Derived from the Avahi example code"""
438
 
        if self.group is not None:
439
 
            try:
440
 
                self.group.Free()
441
 
            except (dbus.exceptions.UnknownMethodException,
442
 
                    dbus.exceptions.DBusException):
443
 
                pass
444
 
            self.group = None
445
 
        self.remove()
446
 
 
447
 
    def server_state_changed(self, state, error=None):
448
 
        """Derived from the Avahi example code"""
449
 
        logger.debug("Avahi server state change: %i", state)
450
 
        bad_states = {
451
 
            avahi.SERVER_INVALID: "Zeroconf server invalid",
452
 
            avahi.SERVER_REGISTERING: None,
453
 
            avahi.SERVER_COLLISION: "Zeroconf server name collision",
454
 
            avahi.SERVER_FAILURE: "Zeroconf server failure",
455
 
        }
456
 
        if state in bad_states:
457
 
            if bad_states[state] is not None:
458
 
                if error is None:
459
 
                    logger.error(bad_states[state])
460
 
                else:
461
 
                    logger.error(bad_states[state] + ": %r", error)
462
 
            self.cleanup()
463
 
        elif state == avahi.SERVER_RUNNING:
464
 
            try:
465
 
                self.add()
466
 
            except dbus.exceptions.DBusException as error:
467
 
                if (error.get_dbus_name()
468
 
                    == "org.freedesktop.Avahi.CollisionError"):
469
 
                    logger.info("Local Zeroconf service name"
470
 
                                " collision.")
471
 
                    return self.rename(remove=False)
472
 
                else:
473
 
                    logger.critical("D-Bus Exception", exc_info=error)
474
 
                    self.cleanup()
475
 
                    os._exit(1)
476
 
        else:
477
 
            if error is None:
478
 
                logger.debug("Unknown state: %r", state)
479
 
            else:
480
 
                logger.debug("Unknown state: %r: %r", state, error)
481
 
 
482
 
    def activate(self):
483
 
        """Derived from the Avahi example code"""
484
 
        if self.server is None:
485
 
            self.server = dbus.Interface(
486
 
                self.bus.get_object(avahi.DBUS_NAME,
487
 
                                    avahi.DBUS_PATH_SERVER,
488
 
                                    follow_name_owner_changes=True),
489
 
                avahi.DBUS_INTERFACE_SERVER)
490
 
        self.server.connect_to_signal("StateChanged",
491
 
                                      self.server_state_changed)
492
 
        self.server_state_changed(self.server.GetState())
493
 
 
494
 
 
495
 
class AvahiServiceToSyslog(AvahiService):
496
 
    def rename(self, *args, **kwargs):
497
 
        """Add the new name to the syslog messages"""
498
 
        ret = AvahiService.rename(self, *args, **kwargs)
499
 
        syslogger.setFormatter(logging.Formatter(
500
 
            'Mandos ({}) [%(process)d]: %(levelname)s: %(message)s'
501
 
            .format(self.name)))
502
 
        return ret
503
 
 
504
 
 
505
 
# Pretend that we have a GnuTLS module
506
 
class GnuTLS(object):
507
 
    """This isn't so much a class as it is a module-like namespace.
508
 
    It is instantiated once, and simulates having a GnuTLS module."""
509
 
 
510
 
    library = ctypes.util.find_library("gnutls")
511
 
    if library is None:
512
 
        library = ctypes.util.find_library("gnutls-deb0")
513
 
    _library = ctypes.cdll.LoadLibrary(library)
514
 
    del library
515
 
    _need_version = b"3.3.0"
516
 
 
517
 
    def __init__(self):
518
 
        # Need to use "self" here, since this method is called before
519
 
        # the assignment to the "gnutls" global variable happens.
520
 
        if self.check_version(self._need_version) is None:
521
 
            raise self.Error("Needs GnuTLS {} or later"
522
 
                             .format(self._need_version))
523
 
 
524
 
    # Unless otherwise indicated, the constants and types below are
525
 
    # all from the gnutls/gnutls.h C header file.
526
 
 
527
 
    # Constants
528
 
    E_SUCCESS = 0
529
 
    E_INTERRUPTED = -52
530
 
    E_AGAIN = -28
531
 
    CRT_OPENPGP = 2
532
 
    CLIENT = 2
533
 
    SHUT_RDWR = 0
534
 
    CRD_CERTIFICATE = 1
535
 
    E_NO_CERTIFICATE_FOUND = -49
536
 
    OPENPGP_FMT_RAW = 0         # gnutls/openpgp.h
537
 
 
538
 
    # Types
539
 
    class session_int(ctypes.Structure):
540
 
        _fields_ = []
541
 
    session_t = ctypes.POINTER(session_int)
542
 
 
543
 
    class certificate_credentials_st(ctypes.Structure):
544
 
        _fields_ = []
545
 
    certificate_credentials_t = ctypes.POINTER(
546
 
        certificate_credentials_st)
547
 
    certificate_type_t = ctypes.c_int
548
 
 
549
 
    class datum_t(ctypes.Structure):
550
 
        _fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),
551
 
                    ('size', ctypes.c_uint)]
552
 
 
553
 
    class openpgp_crt_int(ctypes.Structure):
554
 
        _fields_ = []
555
 
    openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)
556
 
    openpgp_crt_fmt_t = ctypes.c_int  # gnutls/openpgp.h
557
 
    log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)
558
 
    credentials_type_t = ctypes.c_int
559
 
    transport_ptr_t = ctypes.c_void_p
560
 
    close_request_t = ctypes.c_int
561
 
 
562
 
    # Exceptions
563
 
    class Error(Exception):
564
 
        # We need to use the class name "GnuTLS" here, since this
565
 
        # exception might be raised from within GnuTLS.__init__,
566
 
        # which is called before the assignment to the "gnutls"
567
 
        # global variable has happened.
568
 
        def __init__(self, message=None, code=None, args=()):
569
 
            # Default usage is by a message string, but if a return
570
 
            # code is passed, convert it to a string with
571
 
            # gnutls.strerror()
572
 
            self.code = code
573
 
            if message is None and code is not None:
574
 
                message = GnuTLS.strerror(code)
575
 
            return super(GnuTLS.Error, self).__init__(
576
 
                message, *args)
577
 
 
578
 
    class CertificateSecurityError(Error):
579
 
        pass
580
 
 
581
 
    # Classes
582
 
    class Credentials(object):
583
 
        def __init__(self):
584
 
            self._c_object = gnutls.certificate_credentials_t()
585
 
            gnutls.certificate_allocate_credentials(
586
 
                ctypes.byref(self._c_object))
587
 
            self.type = gnutls.CRD_CERTIFICATE
588
 
 
589
 
        def __del__(self):
590
 
            gnutls.certificate_free_credentials(self._c_object)
591
 
 
592
 
    class ClientSession(object):
593
 
        def __init__(self, socket, credentials=None):
594
 
            self._c_object = gnutls.session_t()
595
 
            gnutls.init(ctypes.byref(self._c_object), gnutls.CLIENT)
596
 
            gnutls.set_default_priority(self._c_object)
597
 
            gnutls.transport_set_ptr(self._c_object, socket.fileno())
598
 
            gnutls.handshake_set_private_extensions(self._c_object,
599
 
                                                    True)
600
 
            self.socket = socket
601
 
            if credentials is None:
602
 
                credentials = gnutls.Credentials()
603
 
            gnutls.credentials_set(self._c_object, credentials.type,
604
 
                                   ctypes.cast(credentials._c_object,
605
 
                                               ctypes.c_void_p))
606
 
            self.credentials = credentials
607
 
 
608
 
        def __del__(self):
609
 
            gnutls.deinit(self._c_object)
610
 
 
611
 
        def handshake(self):
612
 
            return gnutls.handshake(self._c_object)
613
 
 
614
 
        def send(self, data):
615
 
            data = bytes(data)
616
 
            data_len = len(data)
617
 
            while data_len > 0:
618
 
                data_len -= gnutls.record_send(self._c_object,
619
 
                                               data[-data_len:],
620
 
                                               data_len)
621
 
 
622
 
        def bye(self):
623
 
            return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)
624
 
 
625
 
    # Error handling functions
626
 
    def _error_code(result):
627
 
        """A function to raise exceptions on errors, suitable
628
 
        for the 'restype' attribute on ctypes functions"""
629
 
        if result >= 0:
630
 
            return result
631
 
        if result == gnutls.E_NO_CERTIFICATE_FOUND:
632
 
            raise gnutls.CertificateSecurityError(code=result)
633
 
        raise gnutls.Error(code=result)
634
 
 
635
 
    def _retry_on_error(result, func, arguments):
636
 
        """A function to retry on some errors, suitable
637
 
        for the 'errcheck' attribute on ctypes functions"""
638
 
        while result < 0:
639
 
            if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):
640
 
                return _error_code(result)
641
 
            result = func(*arguments)
642
 
        return result
643
 
 
644
 
    # Unless otherwise indicated, the function declarations below are
645
 
    # all from the gnutls/gnutls.h C header file.
646
 
 
647
 
    # Functions
648
 
    priority_set_direct = _library.gnutls_priority_set_direct
649
 
    priority_set_direct.argtypes = [session_t, ctypes.c_char_p,
650
 
                                    ctypes.POINTER(ctypes.c_char_p)]
651
 
    priority_set_direct.restype = _error_code
652
 
 
653
 
    init = _library.gnutls_init
654
 
    init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]
655
 
    init.restype = _error_code
656
 
 
657
 
    set_default_priority = _library.gnutls_set_default_priority
658
 
    set_default_priority.argtypes = [session_t]
659
 
    set_default_priority.restype = _error_code
660
 
 
661
 
    record_send = _library.gnutls_record_send
662
 
    record_send.argtypes = [session_t, ctypes.c_void_p,
663
 
                            ctypes.c_size_t]
664
 
    record_send.restype = ctypes.c_ssize_t
665
 
    record_send.errcheck = _retry_on_error
666
 
 
667
 
    certificate_allocate_credentials = (
668
 
        _library.gnutls_certificate_allocate_credentials)
669
 
    certificate_allocate_credentials.argtypes = [
670
 
        ctypes.POINTER(certificate_credentials_t)]
671
 
    certificate_allocate_credentials.restype = _error_code
672
 
 
673
 
    certificate_free_credentials = (
674
 
        _library.gnutls_certificate_free_credentials)
675
 
    certificate_free_credentials.argtypes = [
676
 
        certificate_credentials_t]
677
 
    certificate_free_credentials.restype = None
678
 
 
679
 
    handshake_set_private_extensions = (
680
 
        _library.gnutls_handshake_set_private_extensions)
681
 
    handshake_set_private_extensions.argtypes = [session_t,
682
 
                                                 ctypes.c_int]
683
 
    handshake_set_private_extensions.restype = None
684
 
 
685
 
    credentials_set = _library.gnutls_credentials_set
686
 
    credentials_set.argtypes = [session_t, credentials_type_t,
687
 
                                ctypes.c_void_p]
688
 
    credentials_set.restype = _error_code
689
 
 
690
 
    strerror = _library.gnutls_strerror
691
 
    strerror.argtypes = [ctypes.c_int]
692
 
    strerror.restype = ctypes.c_char_p
693
 
 
694
 
    certificate_type_get = _library.gnutls_certificate_type_get
695
 
    certificate_type_get.argtypes = [session_t]
696
 
    certificate_type_get.restype = _error_code
697
 
 
698
 
    certificate_get_peers = _library.gnutls_certificate_get_peers
699
 
    certificate_get_peers.argtypes = [session_t,
700
 
                                      ctypes.POINTER(ctypes.c_uint)]
701
 
    certificate_get_peers.restype = ctypes.POINTER(datum_t)
702
 
 
703
 
    global_set_log_level = _library.gnutls_global_set_log_level
704
 
    global_set_log_level.argtypes = [ctypes.c_int]
705
 
    global_set_log_level.restype = None
706
 
 
707
 
    global_set_log_function = _library.gnutls_global_set_log_function
708
 
    global_set_log_function.argtypes = [log_func]
709
 
    global_set_log_function.restype = None
710
 
 
711
 
    deinit = _library.gnutls_deinit
712
 
    deinit.argtypes = [session_t]
713
 
    deinit.restype = None
714
 
 
715
 
    handshake = _library.gnutls_handshake
716
 
    handshake.argtypes = [session_t]
717
 
    handshake.restype = _error_code
718
 
    handshake.errcheck = _retry_on_error
719
 
 
720
 
    transport_set_ptr = _library.gnutls_transport_set_ptr
721
 
    transport_set_ptr.argtypes = [session_t, transport_ptr_t]
722
 
    transport_set_ptr.restype = None
723
 
 
724
 
    bye = _library.gnutls_bye
725
 
    bye.argtypes = [session_t, close_request_t]
726
 
    bye.restype = _error_code
727
 
    bye.errcheck = _retry_on_error
728
 
 
729
 
    check_version = _library.gnutls_check_version
730
 
    check_version.argtypes = [ctypes.c_char_p]
731
 
    check_version.restype = ctypes.c_char_p
732
 
 
733
 
    # All the function declarations below are from gnutls/openpgp.h
734
 
 
735
 
    openpgp_crt_init = _library.gnutls_openpgp_crt_init
736
 
    openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]
737
 
    openpgp_crt_init.restype = _error_code
738
 
 
739
 
    openpgp_crt_import = _library.gnutls_openpgp_crt_import
740
 
    openpgp_crt_import.argtypes = [openpgp_crt_t,
741
 
                                   ctypes.POINTER(datum_t),
742
 
                                   openpgp_crt_fmt_t]
743
 
    openpgp_crt_import.restype = _error_code
744
 
 
745
 
    openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self
746
 
    openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,
747
 
                                        ctypes.POINTER(ctypes.c_uint)]
748
 
    openpgp_crt_verify_self.restype = _error_code
749
 
 
750
 
    openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit
751
 
    openpgp_crt_deinit.argtypes = [openpgp_crt_t]
752
 
    openpgp_crt_deinit.restype = None
753
 
 
754
 
    openpgp_crt_get_fingerprint = (
755
 
        _library.gnutls_openpgp_crt_get_fingerprint)
756
 
    openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,
757
 
                                            ctypes.c_void_p,
758
 
                                            ctypes.POINTER(
759
 
                                                ctypes.c_size_t)]
760
 
    openpgp_crt_get_fingerprint.restype = _error_code
761
 
 
762
 
    # Remove non-public functions
763
 
    del _error_code, _retry_on_error
764
 
# Create the global "gnutls" object, simulating a module
765
 
gnutls = GnuTLS()
766
 
 
767
 
 
768
 
def call_pipe(connection,       # : multiprocessing.Connection
769
 
              func, *args, **kwargs):
770
 
    """This function is meant to be called by multiprocessing.Process
771
 
 
772
 
    This function runs func(*args, **kwargs), and writes the resulting
773
 
    return value on the provided multiprocessing.Connection.
774
 
    """
775
 
    connection.send(func(*args, **kwargs))
776
 
    connection.close()
777
 
 
778
 
 
779
 
class Client(object):
 
149
        global group
 
150
        if group is None:
 
151
            group = dbus.Interface(bus.get_object
 
152
                                   (avahi.DBUS_NAME,
 
153
                                    server.EntryGroupNew()),
 
154
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
155
            group.connect_to_signal('StateChanged',
 
156
                                    entry_group_state_changed)
 
157
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
158
                     service.name, service.type)
 
159
        group.AddService(
 
160
                self.interface,         # interface
 
161
                avahi.PROTO_INET6,      # protocol
 
162
                dbus.UInt32(0),         # flags
 
163
                self.name, self.type,
 
164
                self.domain, self.host,
 
165
                dbus.UInt16(self.port),
 
166
                avahi.string_array_to_txt_array(self.TXT))
 
167
        group.Commit()
 
168
 
 
169
# From the Avahi example code:
 
170
group = None                            # our entry group
 
171
# End of Avahi example code
 
172
 
 
173
 
 
174
def _datetime_to_dbus(dt, variant_level=0):
 
175
    """Convert a UTC datetime.datetime() to a D-Bus type."""
 
176
    return dbus.String(dt.isoformat(), variant_level=variant_level)
 
177
 
 
178
 
 
179
class Client(dbus.service.Object):
780
180
    """A representation of a client host served by this server.
781
 
 
782
181
    Attributes:
783
 
    approved:   bool(); 'None' if not yet approved/disapproved
784
 
    approval_delay: datetime.timedelta(); Time to wait for approval
785
 
    approval_duration: datetime.timedelta(); Duration of one approval
 
182
    name:       string; from the config file, used in log messages and
 
183
                        D-Bus identifiers
 
184
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
185
                 uniquely identify the client
 
186
    secret:     bytestring; sent verbatim (over TLS) to client
 
187
    host:       string; available for use by the checker command
 
188
    created:    datetime.datetime(); (UTC) object creation
 
189
    last_enabled: datetime.datetime(); (UTC)
 
190
    enabled:    bool()
 
191
    last_checked_ok: datetime.datetime(); (UTC) or None
 
192
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
193
                                      until this client is invalid
 
194
    interval:   datetime.timedelta(); How often to start a new checker
 
195
    disable_hook:  If set, called by disable() as disable_hook(self)
786
196
    checker:    subprocess.Popen(); a running checker process used
787
197
                                    to see if the client lives.
788
198
                                    'None' if no process is running.
789
 
    checker_callback_tag: a GLib event source tag, or None
790
 
    checker_command: string; External command which is run to check
791
 
                     if client lives.  %() expansions are done at
 
199
    checker_initiator_tag: a gobject event source tag, or None
 
200
    disable_initiator_tag:    - '' -
 
201
    checker_callback_tag:  - '' -
 
202
    checker_command: string; External command which is run to check if
 
203
                     client lives.  %() expansions are done at
792
204
                     runtime with vars(self) as dict, so that for
793
205
                     instance %(name)s can be used in the command.
794
 
    checker_initiator_tag: a GLib event source tag, or None
795
 
    created:    datetime.datetime(); (UTC) object creation
796
 
    client_structure: Object describing what attributes a client has
797
 
                      and is used for storing the client at exit
798
 
    current_checker_command: string; current running checker_command
799
 
    disable_initiator_tag: a GLib event source tag, or None
800
 
    enabled:    bool()
801
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
802
 
                 uniquely identify the client
803
 
    host:       string; available for use by the checker command
804
 
    interval:   datetime.timedelta(); How often to start a new checker
805
 
    last_approval_request: datetime.datetime(); (UTC) or None
806
 
    last_checked_ok: datetime.datetime(); (UTC) or None
807
 
    last_checker_status: integer between 0 and 255 reflecting exit
808
 
                         status of last checker. -1 reflects crashed
809
 
                         checker, -2 means no checker completed yet.
810
 
    last_checker_signal: The signal which killed the last checker, if
811
 
                         last_checker_status is -1
812
 
    last_enabled: datetime.datetime(); (UTC) or None
813
 
    name:       string; from the config file, used in log messages and
814
 
                        D-Bus identifiers
815
 
    secret:     bytestring; sent verbatim (over TLS) to client
816
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
817
 
                                      until this client is disabled
818
 
    extended_timeout:   extra long timeout when secret has been sent
819
 
    runtime_expansions: Allowed attributes for runtime expansion.
820
 
    expires:    datetime.datetime(); time (UTC) when a client will be
821
 
                disabled, or None
822
 
    server_settings: The server_settings dict from main()
 
206
    use_dbus: bool(); Whether to provide D-Bus interface and signals
 
207
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
823
208
    """
824
 
 
825
 
    runtime_expansions = ("approval_delay", "approval_duration",
826
 
                          "created", "enabled", "expires",
827
 
                          "fingerprint", "host", "interval",
828
 
                          "last_approval_request", "last_checked_ok",
829
 
                          "last_enabled", "name", "timeout")
830
 
    client_defaults = {
831
 
        "timeout": "PT5M",
832
 
        "extended_timeout": "PT15M",
833
 
        "interval": "PT2M",
834
 
        "checker": "fping -q -- %%(host)s",
835
 
        "host": "",
836
 
        "approval_delay": "PT0S",
837
 
        "approval_duration": "PT1S",
838
 
        "approved_by_default": "True",
839
 
        "enabled": "True",
840
 
    }
841
 
 
842
 
    @staticmethod
843
 
    def config_parser(config):
844
 
        """Construct a new dict of client settings of this form:
845
 
        { client_name: {setting_name: value, ...}, ...}
846
 
        with exceptions for any special settings as defined above.
847
 
        NOTE: Must be a pure function. Must return the same result
848
 
        value given the same arguments.
849
 
        """
850
 
        settings = {}
851
 
        for client_name in config.sections():
852
 
            section = dict(config.items(client_name))
853
 
            client = settings[client_name] = {}
854
 
 
855
 
            client["host"] = section["host"]
856
 
            # Reformat values from string types to Python types
857
 
            client["approved_by_default"] = config.getboolean(
858
 
                client_name, "approved_by_default")
859
 
            client["enabled"] = config.getboolean(client_name,
860
 
                                                  "enabled")
861
 
 
862
 
            # Uppercase and remove spaces from fingerprint for later
863
 
            # comparison purposes with return value from the
864
 
            # fingerprint() function
865
 
            client["fingerprint"] = (section["fingerprint"].upper()
866
 
                                     .replace(" ", ""))
867
 
            if "secret" in section:
868
 
                client["secret"] = codecs.decode(section["secret"]
869
 
                                                 .encode("utf-8"),
870
 
                                                 "base64")
871
 
            elif "secfile" in section:
872
 
                with open(os.path.expanduser(os.path.expandvars
873
 
                                             (section["secfile"])),
874
 
                          "rb") as secfile:
875
 
                    client["secret"] = secfile.read()
876
 
            else:
877
 
                raise TypeError("No secret or secfile for section {}"
878
 
                                .format(section))
879
 
            client["timeout"] = string_to_delta(section["timeout"])
880
 
            client["extended_timeout"] = string_to_delta(
881
 
                section["extended_timeout"])
882
 
            client["interval"] = string_to_delta(section["interval"])
883
 
            client["approval_delay"] = string_to_delta(
884
 
                section["approval_delay"])
885
 
            client["approval_duration"] = string_to_delta(
886
 
                section["approval_duration"])
887
 
            client["checker_command"] = section["checker"]
888
 
            client["last_approval_request"] = None
889
 
            client["last_checked_ok"] = None
890
 
            client["last_checker_status"] = -2
891
 
 
892
 
        return settings
893
 
 
894
 
    def __init__(self, settings, name=None, server_settings=None):
 
209
    def timeout_milliseconds(self):
 
210
        "Return the 'timeout' attribute in milliseconds"
 
211
        return ((self.timeout.days * 24 * 60 * 60 * 1000)
 
212
                + (self.timeout.seconds * 1000)
 
213
                + (self.timeout.microseconds // 1000))
 
214
    
 
215
    def interval_milliseconds(self):
 
216
        "Return the 'interval' attribute in milliseconds"
 
217
        return ((self.interval.days * 24 * 60 * 60 * 1000)
 
218
                + (self.interval.seconds * 1000)
 
219
                + (self.interval.microseconds // 1000))
 
220
    
 
221
    def __init__(self, name = None, disable_hook=None, config=None,
 
222
                 use_dbus=True):
 
223
        """Note: the 'checker' key in 'config' sets the
 
224
        'checker_command' attribute and *not* the 'checker'
 
225
        attribute."""
895
226
        self.name = name
896
 
        if server_settings is None:
897
 
            server_settings = {}
898
 
        self.server_settings = server_settings
899
 
        # adding all client settings
900
 
        for setting, value in settings.items():
901
 
            setattr(self, setting, value)
902
 
 
903
 
        if self.enabled:
904
 
            if not hasattr(self, "last_enabled"):
905
 
                self.last_enabled = datetime.datetime.utcnow()
906
 
            if not hasattr(self, "expires"):
907
 
                self.expires = (datetime.datetime.utcnow()
908
 
                                + self.timeout)
 
227
        if config is None:
 
228
            config = {}
 
229
        logger.debug(u"Creating client %r", self.name)
 
230
        self.use_dbus = False   # During __init__
 
231
        # Uppercase and remove spaces from fingerprint for later
 
232
        # comparison purposes with return value from the fingerprint()
 
233
        # function
 
234
        self.fingerprint = (config["fingerprint"].upper()
 
235
                            .replace(u" ", u""))
 
236
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
 
237
        if "secret" in config:
 
238
            self.secret = config["secret"].decode(u"base64")
 
239
        elif "secfile" in config:
 
240
            with closing(open(os.path.expanduser
 
241
                              (os.path.expandvars
 
242
                               (config["secfile"])))) as secfile:
 
243
                self.secret = secfile.read()
909
244
        else:
910
 
            self.last_enabled = None
911
 
            self.expires = None
912
 
 
913
 
        logger.debug("Creating client %r", self.name)
914
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
915
 
        self.created = settings.get("created",
916
 
                                    datetime.datetime.utcnow())
917
 
 
918
 
        # attributes specific for this server instance
 
245
            raise TypeError(u"No secret or secfile for client %s"
 
246
                            % self.name)
 
247
        self.host = config.get("host", "")
 
248
        self.created = datetime.datetime.utcnow()
 
249
        self.enabled = False
 
250
        self.last_enabled = None
 
251
        self.last_checked_ok = None
 
252
        self.timeout = string_to_delta(config["timeout"])
 
253
        self.interval = string_to_delta(config["interval"])
 
254
        self.disable_hook = disable_hook
919
255
        self.checker = None
920
256
        self.checker_initiator_tag = None
921
257
        self.disable_initiator_tag = None
922
258
        self.checker_callback_tag = None
923
 
        self.current_checker_command = None
924
 
        self.approved = None
925
 
        self.approvals_pending = 0
926
 
        self.changedstate = multiprocessing_manager.Condition(
927
 
            multiprocessing_manager.Lock())
928
 
        self.client_structure = [attr
929
 
                                 for attr in self.__dict__.keys()
930
 
                                 if not attr.startswith("_")]
931
 
        self.client_structure.append("client_structure")
932
 
 
933
 
        for name, t in inspect.getmembers(
934
 
                type(self), lambda obj: isinstance(obj, property)):
935
 
            if not name.startswith("_"):
936
 
                self.client_structure.append(name)
937
 
 
938
 
    # Send notice to process children that client state has changed
939
 
    def send_changedstate(self):
940
 
        with self.changedstate:
941
 
            self.changedstate.notify_all()
942
 
 
 
259
        self.checker_command = config["checker"]
 
260
        self.last_connect = None
 
261
        # Only now, when this client is initialized, can it show up on
 
262
        # the D-Bus
 
263
        self.use_dbus = use_dbus
 
264
        if self.use_dbus:
 
265
            self.dbus_object_path = (dbus.ObjectPath
 
266
                                     ("/clients/"
 
267
                                      + self.name.replace(".", "_")))
 
268
            dbus.service.Object.__init__(self, bus,
 
269
                                         self.dbus_object_path)
 
270
    
943
271
    def enable(self):
944
272
        """Start this client's checker and timeout hooks"""
945
 
        if getattr(self, "enabled", False):
946
 
            # Already enabled
947
 
            return
948
 
        self.expires = datetime.datetime.utcnow() + self.timeout
949
 
        self.enabled = True
950
273
        self.last_enabled = datetime.datetime.utcnow()
951
 
        self.init_checker()
952
 
        self.send_changedstate()
953
 
 
954
 
    def disable(self, quiet=True):
955
 
        """Disable this client."""
956
 
        if not getattr(self, "enabled", False):
957
 
            return False
958
 
        if not quiet:
959
 
            logger.info("Disabling client %s", self.name)
960
 
        if getattr(self, "disable_initiator_tag", None) is not None:
961
 
            GLib.source_remove(self.disable_initiator_tag)
962
 
            self.disable_initiator_tag = None
963
 
        self.expires = None
964
 
        if getattr(self, "checker_initiator_tag", None) is not None:
965
 
            GLib.source_remove(self.checker_initiator_tag)
966
 
            self.checker_initiator_tag = None
967
 
        self.stop_checker()
968
 
        self.enabled = False
969
 
        if not quiet:
970
 
            self.send_changedstate()
971
 
        # Do not run this again if called by a GLib.timeout_add
972
 
        return False
973
 
 
974
 
    def __del__(self):
975
 
        self.disable()
976
 
 
977
 
    def init_checker(self):
978
274
        # Schedule a new checker to be started an 'interval' from now,
979
275
        # and every interval from then on.
980
 
        if self.checker_initiator_tag is not None:
981
 
            GLib.source_remove(self.checker_initiator_tag)
982
 
        self.checker_initiator_tag = GLib.timeout_add(
983
 
            int(self.interval.total_seconds() * 1000),
984
 
            self.start_checker)
 
276
        self.checker_initiator_tag = (gobject.timeout_add
 
277
                                      (self.interval_milliseconds(),
 
278
                                       self.start_checker))
 
279
        # Also start a new checker *right now*.
 
280
        self.start_checker()
985
281
        # Schedule a disable() when 'timeout' has passed
986
 
        if self.disable_initiator_tag is not None:
987
 
            GLib.source_remove(self.disable_initiator_tag)
988
 
        self.disable_initiator_tag = GLib.timeout_add(
989
 
            int(self.timeout.total_seconds() * 1000), self.disable)
990
 
        # Also start a new checker *right now*.
991
 
        self.start_checker()
992
 
 
993
 
    def checker_callback(self, source, condition, connection,
994
 
                         command):
 
282
        self.disable_initiator_tag = (gobject.timeout_add
 
283
                                   (self.timeout_milliseconds(),
 
284
                                    self.disable))
 
285
        self.enabled = True
 
286
        if self.use_dbus:
 
287
            # Emit D-Bus signals
 
288
            self.PropertyChanged(dbus.String(u"enabled"),
 
289
                                 dbus.Boolean(True, variant_level=1))
 
290
            self.PropertyChanged(dbus.String(u"last_enabled"),
 
291
                                 (_datetime_to_dbus(self.last_enabled,
 
292
                                                    variant_level=1)))
 
293
    
 
294
    def disable(self):
 
295
        """Disable this client."""
 
296
        if not getattr(self, "enabled", False):
 
297
            return False
 
298
        logger.info(u"Disabling client %s", self.name)
 
299
        if getattr(self, "disable_initiator_tag", False):
 
300
            gobject.source_remove(self.disable_initiator_tag)
 
301
            self.disable_initiator_tag = None
 
302
        if getattr(self, "checker_initiator_tag", False):
 
303
            gobject.source_remove(self.checker_initiator_tag)
 
304
            self.checker_initiator_tag = None
 
305
        self.stop_checker()
 
306
        if self.disable_hook:
 
307
            self.disable_hook(self)
 
308
        self.enabled = False
 
309
        if self.use_dbus:
 
310
            # Emit D-Bus signal
 
311
            self.PropertyChanged(dbus.String(u"enabled"),
 
312
                                 dbus.Boolean(False, variant_level=1))
 
313
        # Do not run this again if called by a gobject.timeout_add
 
314
        return False
 
315
    
 
316
    def __del__(self):
 
317
        self.disable_hook = None
 
318
        self.disable()
 
319
    
 
320
    def checker_callback(self, pid, condition, command):
995
321
        """The checker has completed, so take appropriate actions."""
996
322
        self.checker_callback_tag = None
997
323
        self.checker = None
998
 
        # Read return code from connection (see call_pipe)
999
 
        returncode = connection.recv()
1000
 
        connection.close()
1001
 
 
1002
 
        if returncode >= 0:
1003
 
            self.last_checker_status = returncode
1004
 
            self.last_checker_signal = None
1005
 
            if self.last_checker_status == 0:
1006
 
                logger.info("Checker for %(name)s succeeded",
 
324
        if self.use_dbus:
 
325
            # Emit D-Bus signal
 
326
            self.PropertyChanged(dbus.String(u"checker_running"),
 
327
                                 dbus.Boolean(False, variant_level=1))
 
328
        if os.WIFEXITED(condition):
 
329
            exitstatus = os.WEXITSTATUS(condition)
 
330
            if exitstatus == 0:
 
331
                logger.info(u"Checker for %(name)s succeeded",
1007
332
                            vars(self))
1008
333
                self.checked_ok()
1009
334
            else:
1010
 
                logger.info("Checker for %(name)s failed", vars(self))
 
335
                logger.info(u"Checker for %(name)s failed",
 
336
                            vars(self))
 
337
            if self.use_dbus:
 
338
                # Emit D-Bus signal
 
339
                self.CheckerCompleted(dbus.Int16(exitstatus),
 
340
                                      dbus.Int64(condition),
 
341
                                      dbus.String(command))
1011
342
        else:
1012
 
            self.last_checker_status = -1
1013
 
            self.last_checker_signal = -returncode
1014
 
            logger.warning("Checker for %(name)s crashed?",
 
343
            logger.warning(u"Checker for %(name)s crashed?",
1015
344
                           vars(self))
1016
 
        return False
1017
 
 
 
345
            if self.use_dbus:
 
346
                # Emit D-Bus signal
 
347
                self.CheckerCompleted(dbus.Int16(-1),
 
348
                                      dbus.Int64(condition),
 
349
                                      dbus.String(command))
 
350
    
1018
351
    def checked_ok(self):
1019
 
        """Assert that the client has been seen, alive and well."""
 
352
        """Bump up the timeout for this client.
 
353
        This should only be called when the client has been seen,
 
354
        alive and well.
 
355
        """
1020
356
        self.last_checked_ok = datetime.datetime.utcnow()
1021
 
        self.last_checker_status = 0
1022
 
        self.last_checker_signal = None
1023
 
        self.bump_timeout()
1024
 
 
1025
 
    def bump_timeout(self, timeout=None):
1026
 
        """Bump up the timeout for this client."""
1027
 
        if timeout is None:
1028
 
            timeout = self.timeout
1029
 
        if self.disable_initiator_tag is not None:
1030
 
            GLib.source_remove(self.disable_initiator_tag)
1031
 
            self.disable_initiator_tag = None
1032
 
        if getattr(self, "enabled", False):
1033
 
            self.disable_initiator_tag = GLib.timeout_add(
1034
 
                int(timeout.total_seconds() * 1000), self.disable)
1035
 
            self.expires = datetime.datetime.utcnow() + timeout
1036
 
 
1037
 
    def need_approval(self):
1038
 
        self.last_approval_request = datetime.datetime.utcnow()
1039
 
 
 
357
        gobject.source_remove(self.disable_initiator_tag)
 
358
        self.disable_initiator_tag = (gobject.timeout_add
 
359
                                      (self.timeout_milliseconds(),
 
360
                                       self.disable))
 
361
        if self.use_dbus:
 
362
            # Emit D-Bus signal
 
363
            self.PropertyChanged(
 
364
                dbus.String(u"last_checked_ok"),
 
365
                (_datetime_to_dbus(self.last_checked_ok,
 
366
                                   variant_level=1)))
 
367
    
1040
368
    def start_checker(self):
1041
369
        """Start a new checker subprocess if one is not running.
1042
 
 
1043
370
        If a checker already exists, leave it running and do
1044
371
        nothing."""
1045
372
        # The reason for not killing a running checker is that if we
1046
 
        # did that, and if a checker (for some reason) started running
1047
 
        # slowly and taking more than 'interval' time, then the client
1048
 
        # would inevitably timeout, since no checker would get a
1049
 
        # chance to run to completion.  If we instead leave running
 
373
        # did that, then if a checker (for some reason) started
 
374
        # running slowly and taking more than 'interval' time, the
 
375
        # client would inevitably timeout, since no checker would get
 
376
        # a chance to run to completion.  If we instead leave running
1050
377
        # checkers alone, the checker would have to take more time
1051
 
        # than 'timeout' for the client to be disabled, which is as it
1052
 
        # should be.
1053
 
 
1054
 
        if self.checker is not None and not self.checker.is_alive():
1055
 
            logger.warning("Checker was not alive; joining")
1056
 
            self.checker.join()
1057
 
            self.checker = None
1058
 
        # Start a new checker if needed
 
378
        # than 'timeout' for the client to be declared invalid, which
 
379
        # is as it should be.
1059
380
        if self.checker is None:
1060
 
            # Escape attributes for the shell
1061
 
            escaped_attrs = {
1062
 
                attr: re.escape(str(getattr(self, attr)))
1063
 
                for attr in self.runtime_expansions}
1064
 
            try:
1065
 
                command = self.checker_command % escaped_attrs
1066
 
            except TypeError as error:
1067
 
                logger.error('Could not format string "%s"',
1068
 
                             self.checker_command,
1069
 
                             exc_info=error)
1070
 
                return True     # Try again later
1071
 
            self.current_checker_command = command
1072
 
            logger.info("Starting checker %r for %s", command,
1073
 
                        self.name)
1074
 
            # We don't need to redirect stdout and stderr, since
1075
 
            # in normal mode, that is already done by daemon(),
1076
 
            # and in debug mode we don't want to.  (Stdin is
1077
 
            # always replaced by /dev/null.)
1078
 
            # The exception is when not debugging but nevertheless
1079
 
            # running in the foreground; use the previously
1080
 
            # created wnull.
1081
 
            popen_args = {"close_fds": True,
1082
 
                          "shell": True,
1083
 
                          "cwd": "/"}
1084
 
            if (not self.server_settings["debug"]
1085
 
                and self.server_settings["foreground"]):
1086
 
                popen_args.update({"stdout": wnull,
1087
 
                                   "stderr": wnull})
1088
 
            pipe = multiprocessing.Pipe(duplex=False)
1089
 
            self.checker = multiprocessing.Process(
1090
 
                target=call_pipe,
1091
 
                args=(pipe[1], subprocess.call, command),
1092
 
                kwargs=popen_args)
1093
 
            self.checker.start()
1094
 
            self.checker_callback_tag = GLib.io_add_watch(
1095
 
                pipe[0].fileno(), GLib.IO_IN,
1096
 
                self.checker_callback, pipe[0], command)
1097
 
        # Re-run this periodically if run by GLib.timeout_add
 
381
            try:
 
382
                # In case checker_command has exactly one % operator
 
383
                command = self.checker_command % self.host
 
384
            except TypeError:
 
385
                # Escape attributes for the shell
 
386
                escaped_attrs = dict((key, re.escape(str(val)))
 
387
                                     for key, val in
 
388
                                     vars(self).iteritems())
 
389
                try:
 
390
                    command = self.checker_command % escaped_attrs
 
391
                except TypeError, error:
 
392
                    logger.error(u'Could not format string "%s":'
 
393
                                 u' %s', self.checker_command, error)
 
394
                    return True # Try again later
 
395
            try:
 
396
                logger.info(u"Starting checker %r for %s",
 
397
                            command, self.name)
 
398
                # We don't need to redirect stdout and stderr, since
 
399
                # in normal mode, that is already done by daemon(),
 
400
                # and in debug mode we don't want to.  (Stdin is
 
401
                # always replaced by /dev/null.)
 
402
                self.checker = subprocess.Popen(command,
 
403
                                                close_fds=True,
 
404
                                                shell=True, cwd="/")
 
405
                if self.use_dbus:
 
406
                    # Emit D-Bus signal
 
407
                    self.CheckerStarted(command)
 
408
                    self.PropertyChanged(
 
409
                        dbus.String("checker_running"),
 
410
                        dbus.Boolean(True, variant_level=1))
 
411
                self.checker_callback_tag = (gobject.child_watch_add
 
412
                                             (self.checker.pid,
 
413
                                              self.checker_callback,
 
414
                                              data=command))
 
415
            except OSError, error:
 
416
                logger.error(u"Failed to start subprocess: %s",
 
417
                             error)
 
418
        # Re-run this periodically if run by gobject.timeout_add
1098
419
        return True
1099
 
 
 
420
    
1100
421
    def stop_checker(self):
1101
422
        """Force the checker process, if any, to stop."""
1102
423
        if self.checker_callback_tag:
1103
 
            GLib.source_remove(self.checker_callback_tag)
 
424
            gobject.source_remove(self.checker_callback_tag)
1104
425
            self.checker_callback_tag = None
1105
426
        if getattr(self, "checker", None) is None:
1106
427
            return
1107
 
        logger.debug("Stopping checker for %(name)s", vars(self))
1108
 
        self.checker.terminate()
 
428
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
429
        try:
 
430
            os.kill(self.checker.pid, signal.SIGTERM)
 
431
            #os.sleep(0.5)
 
432
            #if self.checker.poll() is None:
 
433
            #    os.kill(self.checker.pid, signal.SIGKILL)
 
434
        except OSError, error:
 
435
            if error.errno != errno.ESRCH: # No such process
 
436
                raise
1109
437
        self.checker = None
1110
 
 
1111
 
 
1112
 
def dbus_service_property(dbus_interface,
1113
 
                          signature="v",
1114
 
                          access="readwrite",
1115
 
                          byte_arrays=False):
1116
 
    """Decorators for marking methods of a DBusObjectWithProperties to
1117
 
    become properties on the D-Bus.
1118
 
 
1119
 
    The decorated method will be called with no arguments by "Get"
1120
 
    and with one argument by "Set".
1121
 
 
1122
 
    The parameters, where they are supported, are the same as
1123
 
    dbus.service.method, except there is only "signature", since the
1124
 
    type from Get() and the type sent to Set() is the same.
1125
 
    """
1126
 
    # Encoding deeply encoded byte arrays is not supported yet by the
1127
 
    # "Set" method, so we fail early here:
1128
 
    if byte_arrays and signature != "ay":
1129
 
        raise ValueError("Byte arrays not supported for non-'ay'"
1130
 
                         " signature {!r}".format(signature))
1131
 
 
1132
 
    def decorator(func):
1133
 
        func._dbus_is_property = True
1134
 
        func._dbus_interface = dbus_interface
1135
 
        func._dbus_signature = signature
1136
 
        func._dbus_access = access
1137
 
        func._dbus_name = func.__name__
1138
 
        if func._dbus_name.endswith("_dbus_property"):
1139
 
            func._dbus_name = func._dbus_name[:-14]
1140
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays}
1141
 
        return func
1142
 
 
1143
 
    return decorator
1144
 
 
1145
 
 
1146
 
def dbus_interface_annotations(dbus_interface):
1147
 
    """Decorator for marking functions returning interface annotations
1148
 
 
1149
 
    Usage:
1150
 
 
1151
 
    @dbus_interface_annotations("org.example.Interface")
1152
 
    def _foo(self):  # Function name does not matter
1153
 
        return {"org.freedesktop.DBus.Deprecated": "true",
1154
 
                "org.freedesktop.DBus.Property.EmitsChangedSignal":
1155
 
                    "false"}
1156
 
    """
1157
 
 
1158
 
    def decorator(func):
1159
 
        func._dbus_is_interface = True
1160
 
        func._dbus_interface = dbus_interface
1161
 
        func._dbus_name = dbus_interface
1162
 
        return func
1163
 
 
1164
 
    return decorator
1165
 
 
1166
 
 
1167
 
def dbus_annotations(annotations):
1168
 
    """Decorator to annotate D-Bus methods, signals or properties
1169
 
    Usage:
1170
 
 
1171
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true",
1172
 
                       "org.freedesktop.DBus.Property."
1173
 
                       "EmitsChangedSignal": "false"})
1174
 
    @dbus_service_property("org.example.Interface", signature="b",
1175
 
                           access="r")
1176
 
    def Property_dbus_property(self):
1177
 
        return dbus.Boolean(False)
1178
 
 
1179
 
    See also the DBusObjectWithAnnotations class.
1180
 
    """
1181
 
 
1182
 
    def decorator(func):
1183
 
        func._dbus_annotations = annotations
1184
 
        return func
1185
 
 
1186
 
    return decorator
1187
 
 
1188
 
 
1189
 
class DBusPropertyException(dbus.exceptions.DBusException):
1190
 
    """A base class for D-Bus property-related exceptions
1191
 
    """
1192
 
    pass
1193
 
 
1194
 
 
1195
 
class DBusPropertyAccessException(DBusPropertyException):
1196
 
    """A property's access permissions disallows an operation.
1197
 
    """
1198
 
    pass
1199
 
 
1200
 
 
1201
 
class DBusPropertyNotFound(DBusPropertyException):
1202
 
    """An attempt was made to access a non-existing property.
1203
 
    """
1204
 
    pass
1205
 
 
1206
 
 
1207
 
class DBusObjectWithAnnotations(dbus.service.Object):
1208
 
    """A D-Bus object with annotations.
1209
 
 
1210
 
    Classes inheriting from this can use the dbus_annotations
1211
 
    decorator to add annotations to methods or signals.
1212
 
    """
1213
 
 
1214
 
    @staticmethod
1215
 
    def _is_dbus_thing(thing):
1216
 
        """Returns a function testing if an attribute is a D-Bus thing
1217
 
 
1218
 
        If called like _is_dbus_thing("method") it returns a function
1219
 
        suitable for use as predicate to inspect.getmembers().
1220
 
        """
1221
 
        return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),
1222
 
                                   False)
1223
 
 
1224
 
    def _get_all_dbus_things(self, thing):
1225
 
        """Returns a generator of (name, attribute) pairs
1226
 
        """
1227
 
        return ((getattr(athing.__get__(self), "_dbus_name", name),
1228
 
                 athing.__get__(self))
1229
 
                for cls in self.__class__.__mro__
1230
 
                for name, athing in
1231
 
                inspect.getmembers(cls, self._is_dbus_thing(thing)))
1232
 
 
1233
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1234
 
                         out_signature="s",
1235
 
                         path_keyword='object_path',
1236
 
                         connection_keyword='connection')
1237
 
    def Introspect(self, object_path, connection):
1238
 
        """Overloading of standard D-Bus method.
1239
 
 
1240
 
        Inserts annotation tags on methods and signals.
1241
 
        """
1242
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
1243
 
                                                   connection)
1244
 
        try:
1245
 
            document = xml.dom.minidom.parseString(xmlstring)
1246
 
 
1247
 
            for if_tag in document.getElementsByTagName("interface"):
1248
 
                # Add annotation tags
1249
 
                for typ in ("method", "signal"):
1250
 
                    for tag in if_tag.getElementsByTagName(typ):
1251
 
                        annots = dict()
1252
 
                        for name, prop in (self.
1253
 
                                           _get_all_dbus_things(typ)):
1254
 
                            if (name == tag.getAttribute("name")
1255
 
                                and prop._dbus_interface
1256
 
                                == if_tag.getAttribute("name")):
1257
 
                                annots.update(getattr(
1258
 
                                    prop, "_dbus_annotations", {}))
1259
 
                        for name, value in annots.items():
1260
 
                            ann_tag = document.createElement(
1261
 
                                "annotation")
1262
 
                            ann_tag.setAttribute("name", name)
1263
 
                            ann_tag.setAttribute("value", value)
1264
 
                            tag.appendChild(ann_tag)
1265
 
                # Add interface annotation tags
1266
 
                for annotation, value in dict(
1267
 
                    itertools.chain.from_iterable(
1268
 
                        annotations().items()
1269
 
                        for name, annotations
1270
 
                        in self._get_all_dbus_things("interface")
1271
 
                        if name == if_tag.getAttribute("name")
1272
 
                        )).items():
1273
 
                    ann_tag = document.createElement("annotation")
1274
 
                    ann_tag.setAttribute("name", annotation)
1275
 
                    ann_tag.setAttribute("value", value)
1276
 
                    if_tag.appendChild(ann_tag)
1277
 
                # Fix argument name for the Introspect method itself
1278
 
                if (if_tag.getAttribute("name")
1279
 
                    == dbus.INTROSPECTABLE_IFACE):
1280
 
                    for cn in if_tag.getElementsByTagName("method"):
1281
 
                        if cn.getAttribute("name") == "Introspect":
1282
 
                            for arg in cn.getElementsByTagName("arg"):
1283
 
                                if (arg.getAttribute("direction")
1284
 
                                    == "out"):
1285
 
                                    arg.setAttribute("name",
1286
 
                                                     "xml_data")
1287
 
            xmlstring = document.toxml("utf-8")
1288
 
            document.unlink()
1289
 
        except (AttributeError, xml.dom.DOMException,
1290
 
                xml.parsers.expat.ExpatError) as error:
1291
 
            logger.error("Failed to override Introspection method",
1292
 
                         exc_info=error)
1293
 
        return xmlstring
1294
 
 
1295
 
 
1296
 
class DBusObjectWithProperties(DBusObjectWithAnnotations):
1297
 
    """A D-Bus object with properties.
1298
 
 
1299
 
    Classes inheriting from this can use the dbus_service_property
1300
 
    decorator to expose methods as D-Bus properties.  It exposes the
1301
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
1302
 
    """
1303
 
 
1304
 
    def _get_dbus_property(self, interface_name, property_name):
1305
 
        """Returns a bound method if one exists which is a D-Bus
1306
 
        property with the specified name and interface.
1307
 
        """
1308
 
        for cls in self.__class__.__mro__:
1309
 
            for name, value in inspect.getmembers(
1310
 
                    cls, self._is_dbus_thing("property")):
1311
 
                if (value._dbus_name == property_name
1312
 
                    and value._dbus_interface == interface_name):
1313
 
                    return value.__get__(self)
1314
 
 
1315
 
        # No such property
1316
 
        raise DBusPropertyNotFound("{}:{}.{}".format(
1317
 
            self.dbus_object_path, interface_name, property_name))
1318
 
 
1319
 
    @classmethod
1320
 
    def _get_all_interface_names(cls):
1321
 
        """Get a sequence of all interfaces supported by an object"""
1322
 
        return (name for name in set(getattr(getattr(x, attr),
1323
 
                                             "_dbus_interface", None)
1324
 
                                     for x in (inspect.getmro(cls))
1325
 
                                     for attr in dir(x))
1326
 
                if name is not None)
1327
 
 
1328
 
    @dbus.service.method(dbus.PROPERTIES_IFACE,
1329
 
                         in_signature="ss",
1330
 
                         out_signature="v")
1331
 
    def Get(self, interface_name, property_name):
1332
 
        """Standard D-Bus property Get() method, see D-Bus standard.
1333
 
        """
1334
 
        prop = self._get_dbus_property(interface_name, property_name)
1335
 
        if prop._dbus_access == "write":
1336
 
            raise DBusPropertyAccessException(property_name)
1337
 
        value = prop()
1338
 
        if not hasattr(value, "variant_level"):
1339
 
            return value
1340
 
        return type(value)(value, variant_level=value.variant_level+1)
1341
 
 
1342
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
1343
 
    def Set(self, interface_name, property_name, value):
1344
 
        """Standard D-Bus property Set() method, see D-Bus standard.
1345
 
        """
1346
 
        prop = self._get_dbus_property(interface_name, property_name)
1347
 
        if prop._dbus_access == "read":
1348
 
            raise DBusPropertyAccessException(property_name)
1349
 
        if prop._dbus_get_args_options["byte_arrays"]:
1350
 
            # The byte_arrays option is not supported yet on
1351
 
            # signatures other than "ay".
1352
 
            if prop._dbus_signature != "ay":
1353
 
                raise ValueError("Byte arrays not supported for non-"
1354
 
                                 "'ay' signature {!r}"
1355
 
                                 .format(prop._dbus_signature))
1356
 
            value = dbus.ByteArray(b''.join(chr(byte)
1357
 
                                            for byte in value))
1358
 
        prop(value)
1359
 
 
1360
 
    @dbus.service.method(dbus.PROPERTIES_IFACE,
1361
 
                         in_signature="s",
1362
 
                         out_signature="a{sv}")
1363
 
    def GetAll(self, interface_name):
1364
 
        """Standard D-Bus property GetAll() method, see D-Bus
1365
 
        standard.
1366
 
 
1367
 
        Note: Will not include properties with access="write".
1368
 
        """
1369
 
        properties = {}
1370
 
        for name, prop in self._get_all_dbus_things("property"):
1371
 
            if (interface_name
1372
 
                and interface_name != prop._dbus_interface):
1373
 
                # Interface non-empty but did not match
1374
 
                continue
1375
 
            # Ignore write-only properties
1376
 
            if prop._dbus_access == "write":
1377
 
                continue
1378
 
            value = prop()
1379
 
            if not hasattr(value, "variant_level"):
1380
 
                properties[name] = value
1381
 
                continue
1382
 
            properties[name] = type(value)(
1383
 
                value, variant_level=value.variant_level + 1)
1384
 
        return dbus.Dictionary(properties, signature="sv")
1385
 
 
1386
 
    @dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")
1387
 
    def PropertiesChanged(self, interface_name, changed_properties,
1388
 
                          invalidated_properties):
1389
 
        """Standard D-Bus PropertiesChanged() signal, see D-Bus
1390
 
        standard.
1391
 
        """
1392
 
        pass
1393
 
 
1394
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1395
 
                         out_signature="s",
1396
 
                         path_keyword='object_path',
1397
 
                         connection_keyword='connection')
1398
 
    def Introspect(self, object_path, connection):
1399
 
        """Overloading of standard D-Bus method.
1400
 
 
1401
 
        Inserts property tags and interface annotation tags.
1402
 
        """
1403
 
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
1404
 
                                                         object_path,
1405
 
                                                         connection)
1406
 
        try:
1407
 
            document = xml.dom.minidom.parseString(xmlstring)
1408
 
 
1409
 
            def make_tag(document, name, prop):
1410
 
                e = document.createElement("property")
1411
 
                e.setAttribute("name", name)
1412
 
                e.setAttribute("type", prop._dbus_signature)
1413
 
                e.setAttribute("access", prop._dbus_access)
1414
 
                return e
1415
 
 
1416
 
            for if_tag in document.getElementsByTagName("interface"):
1417
 
                # Add property tags
1418
 
                for tag in (make_tag(document, name, prop)
1419
 
                            for name, prop
1420
 
                            in self._get_all_dbus_things("property")
1421
 
                            if prop._dbus_interface
1422
 
                            == if_tag.getAttribute("name")):
1423
 
                    if_tag.appendChild(tag)
1424
 
                # Add annotation tags for properties
1425
 
                for tag in if_tag.getElementsByTagName("property"):
1426
 
                    annots = dict()
1427
 
                    for name, prop in self._get_all_dbus_things(
1428
 
                            "property"):
1429
 
                        if (name == tag.getAttribute("name")
1430
 
                            and prop._dbus_interface
1431
 
                            == if_tag.getAttribute("name")):
1432
 
                            annots.update(getattr(
1433
 
                                prop, "_dbus_annotations", {}))
1434
 
                    for name, value in annots.items():
1435
 
                        ann_tag = document.createElement(
1436
 
                            "annotation")
1437
 
                        ann_tag.setAttribute("name", name)
1438
 
                        ann_tag.setAttribute("value", value)
1439
 
                        tag.appendChild(ann_tag)
1440
 
                # Add the names to the return values for the
1441
 
                # "org.freedesktop.DBus.Properties" methods
1442
 
                if (if_tag.getAttribute("name")
1443
 
                    == "org.freedesktop.DBus.Properties"):
1444
 
                    for cn in if_tag.getElementsByTagName("method"):
1445
 
                        if cn.getAttribute("name") == "Get":
1446
 
                            for arg in cn.getElementsByTagName("arg"):
1447
 
                                if (arg.getAttribute("direction")
1448
 
                                    == "out"):
1449
 
                                    arg.setAttribute("name", "value")
1450
 
                        elif cn.getAttribute("name") == "GetAll":
1451
 
                            for arg in cn.getElementsByTagName("arg"):
1452
 
                                if (arg.getAttribute("direction")
1453
 
                                    == "out"):
1454
 
                                    arg.setAttribute("name", "props")
1455
 
            xmlstring = document.toxml("utf-8")
1456
 
            document.unlink()
1457
 
        except (AttributeError, xml.dom.DOMException,
1458
 
                xml.parsers.expat.ExpatError) as error:
1459
 
            logger.error("Failed to override Introspection method",
1460
 
                         exc_info=error)
1461
 
        return xmlstring
1462
 
 
1463
 
 
1464
 
try:
1465
 
    dbus.OBJECT_MANAGER_IFACE
1466
 
except AttributeError:
1467
 
    dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"
1468
 
 
1469
 
 
1470
 
class DBusObjectWithObjectManager(DBusObjectWithAnnotations):
1471
 
    """A D-Bus object with an ObjectManager.
1472
 
 
1473
 
    Classes inheriting from this exposes the standard
1474
 
    GetManagedObjects call and the InterfacesAdded and
1475
 
    InterfacesRemoved signals on the standard
1476
 
    "org.freedesktop.DBus.ObjectManager" interface.
1477
 
 
1478
 
    Note: No signals are sent automatically; they must be sent
1479
 
    manually.
1480
 
    """
1481
 
    @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
1482
 
                         out_signature="a{oa{sa{sv}}}")
1483
 
    def GetManagedObjects(self):
1484
 
        """This function must be overridden"""
1485
 
        raise NotImplementedError()
1486
 
 
1487
 
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,
1488
 
                         signature="oa{sa{sv}}")
1489
 
    def InterfacesAdded(self, object_path, interfaces_and_properties):
1490
 
        pass
1491
 
 
1492
 
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature="oas")
1493
 
    def InterfacesRemoved(self, object_path, interfaces):
1494
 
        pass
1495
 
 
1496
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1497
 
                         out_signature="s",
1498
 
                         path_keyword='object_path',
1499
 
                         connection_keyword='connection')
1500
 
    def Introspect(self, object_path, connection):
1501
 
        """Overloading of standard D-Bus method.
1502
 
 
1503
 
        Override return argument name of GetManagedObjects to be
1504
 
        "objpath_interfaces_and_properties"
1505
 
        """
1506
 
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
1507
 
                                                         object_path,
1508
 
                                                         connection)
1509
 
        try:
1510
 
            document = xml.dom.minidom.parseString(xmlstring)
1511
 
 
1512
 
            for if_tag in document.getElementsByTagName("interface"):
1513
 
                # Fix argument name for the GetManagedObjects method
1514
 
                if (if_tag.getAttribute("name")
1515
 
                    == dbus.OBJECT_MANAGER_IFACE):
1516
 
                    for cn in if_tag.getElementsByTagName("method"):
1517
 
                        if (cn.getAttribute("name")
1518
 
                            == "GetManagedObjects"):
1519
 
                            for arg in cn.getElementsByTagName("arg"):
1520
 
                                if (arg.getAttribute("direction")
1521
 
                                    == "out"):
1522
 
                                    arg.setAttribute(
1523
 
                                        "name",
1524
 
                                        "objpath_interfaces"
1525
 
                                        "_and_properties")
1526
 
            xmlstring = document.toxml("utf-8")
1527
 
            document.unlink()
1528
 
        except (AttributeError, xml.dom.DOMException,
1529
 
                xml.parsers.expat.ExpatError) as error:
1530
 
            logger.error("Failed to override Introspection method",
1531
 
                         exc_info=error)
1532
 
        return xmlstring
1533
 
 
1534
 
 
1535
 
def datetime_to_dbus(dt, variant_level=0):
1536
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
1537
 
    if dt is None:
1538
 
        return dbus.String("", variant_level=variant_level)
1539
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
1540
 
 
1541
 
 
1542
 
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
1543
 
    """A class decorator; applied to a subclass of
1544
 
    dbus.service.Object, it will add alternate D-Bus attributes with
1545
 
    interface names according to the "alt_interface_names" mapping.
1546
 
    Usage:
1547
 
 
1548
 
    @alternate_dbus_interfaces({"org.example.Interface":
1549
 
                                    "net.example.AlternateInterface"})
1550
 
    class SampleDBusObject(dbus.service.Object):
1551
 
        @dbus.service.method("org.example.Interface")
1552
 
        def SampleDBusMethod():
1553
 
            pass
1554
 
 
1555
 
    The above "SampleDBusMethod" on "SampleDBusObject" will be
1556
 
    reachable via two interfaces: "org.example.Interface" and
1557
 
    "net.example.AlternateInterface", the latter of which will have
1558
 
    its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
1559
 
    "true", unless "deprecate" is passed with a False value.
1560
 
 
1561
 
    This works for methods and signals, and also for D-Bus properties
1562
 
    (from DBusObjectWithProperties) and interfaces (from the
1563
 
    dbus_interface_annotations decorator).
1564
 
    """
1565
 
 
1566
 
    def wrapper(cls):
1567
 
        for orig_interface_name, alt_interface_name in (
1568
 
                alt_interface_names.items()):
1569
 
            attr = {}
1570
 
            interface_names = set()
1571
 
            # Go though all attributes of the class
1572
 
            for attrname, attribute in inspect.getmembers(cls):
1573
 
                # Ignore non-D-Bus attributes, and D-Bus attributes
1574
 
                # with the wrong interface name
1575
 
                if (not hasattr(attribute, "_dbus_interface")
1576
 
                    or not attribute._dbus_interface.startswith(
1577
 
                        orig_interface_name)):
1578
 
                    continue
1579
 
                # Create an alternate D-Bus interface name based on
1580
 
                # the current name
1581
 
                alt_interface = attribute._dbus_interface.replace(
1582
 
                    orig_interface_name, alt_interface_name)
1583
 
                interface_names.add(alt_interface)
1584
 
                # Is this a D-Bus signal?
1585
 
                if getattr(attribute, "_dbus_is_signal", False):
1586
 
                    # Extract the original non-method undecorated
1587
 
                    # function by black magic
1588
 
                    if sys.version_info.major == 2:
1589
 
                        nonmethod_func = (dict(
1590
 
                            zip(attribute.func_code.co_freevars,
1591
 
                                attribute.__closure__))
1592
 
                                          ["func"].cell_contents)
1593
 
                    else:
1594
 
                        nonmethod_func = (dict(
1595
 
                            zip(attribute.__code__.co_freevars,
1596
 
                                attribute.__closure__))
1597
 
                                          ["func"].cell_contents)
1598
 
                    # Create a new, but exactly alike, function
1599
 
                    # object, and decorate it to be a new D-Bus signal
1600
 
                    # with the alternate D-Bus interface name
1601
 
                    new_function = copy_function(nonmethod_func)
1602
 
                    new_function = (dbus.service.signal(
1603
 
                        alt_interface,
1604
 
                        attribute._dbus_signature)(new_function))
1605
 
                    # Copy annotations, if any
1606
 
                    try:
1607
 
                        new_function._dbus_annotations = dict(
1608
 
                            attribute._dbus_annotations)
1609
 
                    except AttributeError:
1610
 
                        pass
1611
 
 
1612
 
                    # Define a creator of a function to call both the
1613
 
                    # original and alternate functions, so both the
1614
 
                    # original and alternate signals gets sent when
1615
 
                    # the function is called
1616
 
                    def fixscope(func1, func2):
1617
 
                        """This function is a scope container to pass
1618
 
                        func1 and func2 to the "call_both" function
1619
 
                        outside of its arguments"""
1620
 
 
1621
 
                        @functools.wraps(func2)
1622
 
                        def call_both(*args, **kwargs):
1623
 
                            """This function will emit two D-Bus
1624
 
                            signals by calling func1 and func2"""
1625
 
                            func1(*args, **kwargs)
1626
 
                            func2(*args, **kwargs)
1627
 
                        # Make wrapper function look like a D-Bus
1628
 
                        # signal
1629
 
                        for name, attr in inspect.getmembers(func2):
1630
 
                            if name.startswith("_dbus_"):
1631
 
                                setattr(call_both, name, attr)
1632
 
 
1633
 
                        return call_both
1634
 
                    # Create the "call_both" function and add it to
1635
 
                    # the class
1636
 
                    attr[attrname] = fixscope(attribute, new_function)
1637
 
                # Is this a D-Bus method?
1638
 
                elif getattr(attribute, "_dbus_is_method", False):
1639
 
                    # Create a new, but exactly alike, function
1640
 
                    # object.  Decorate it to be a new D-Bus method
1641
 
                    # with the alternate D-Bus interface name.  Add it
1642
 
                    # to the class.
1643
 
                    attr[attrname] = (
1644
 
                        dbus.service.method(
1645
 
                            alt_interface,
1646
 
                            attribute._dbus_in_signature,
1647
 
                            attribute._dbus_out_signature)
1648
 
                        (copy_function(attribute)))
1649
 
                    # Copy annotations, if any
1650
 
                    try:
1651
 
                        attr[attrname]._dbus_annotations = dict(
1652
 
                            attribute._dbus_annotations)
1653
 
                    except AttributeError:
1654
 
                        pass
1655
 
                # Is this a D-Bus property?
1656
 
                elif getattr(attribute, "_dbus_is_property", False):
1657
 
                    # Create a new, but exactly alike, function
1658
 
                    # object, and decorate it to be a new D-Bus
1659
 
                    # property with the alternate D-Bus interface
1660
 
                    # name.  Add it to the class.
1661
 
                    attr[attrname] = (dbus_service_property(
1662
 
                        alt_interface, attribute._dbus_signature,
1663
 
                        attribute._dbus_access,
1664
 
                        attribute._dbus_get_args_options
1665
 
                        ["byte_arrays"])
1666
 
                                      (copy_function(attribute)))
1667
 
                    # Copy annotations, if any
1668
 
                    try:
1669
 
                        attr[attrname]._dbus_annotations = dict(
1670
 
                            attribute._dbus_annotations)
1671
 
                    except AttributeError:
1672
 
                        pass
1673
 
                # Is this a D-Bus interface?
1674
 
                elif getattr(attribute, "_dbus_is_interface", False):
1675
 
                    # Create a new, but exactly alike, function
1676
 
                    # object.  Decorate it to be a new D-Bus interface
1677
 
                    # with the alternate D-Bus interface name.  Add it
1678
 
                    # to the class.
1679
 
                    attr[attrname] = (
1680
 
                        dbus_interface_annotations(alt_interface)
1681
 
                        (copy_function(attribute)))
1682
 
            if deprecate:
1683
 
                # Deprecate all alternate interfaces
1684
 
                iname = "_AlternateDBusNames_interface_annotation{}"
1685
 
                for interface_name in interface_names:
1686
 
 
1687
 
                    @dbus_interface_annotations(interface_name)
1688
 
                    def func(self):
1689
 
                        return {"org.freedesktop.DBus.Deprecated":
1690
 
                                "true"}
1691
 
                    # Find an unused name
1692
 
                    for aname in (iname.format(i)
1693
 
                                  for i in itertools.count()):
1694
 
                        if aname not in attr:
1695
 
                            attr[aname] = func
1696
 
                            break
1697
 
            if interface_names:
1698
 
                # Replace the class with a new subclass of it with
1699
 
                # methods, signals, etc. as created above.
1700
 
                if sys.version_info.major == 2:
1701
 
                    cls = type(b"{}Alternate".format(cls.__name__),
1702
 
                               (cls, ), attr)
1703
 
                else:
1704
 
                    cls = type("{}Alternate".format(cls.__name__),
1705
 
                               (cls, ), attr)
1706
 
        return cls
1707
 
 
1708
 
    return wrapper
1709
 
 
1710
 
 
1711
 
@alternate_dbus_interfaces({"se.recompile.Mandos":
1712
 
                            "se.bsnet.fukt.Mandos"})
1713
 
class ClientDBus(Client, DBusObjectWithProperties):
1714
 
    """A Client class using D-Bus
1715
 
 
1716
 
    Attributes:
1717
 
    dbus_object_path: dbus.ObjectPath
1718
 
    bus: dbus.SystemBus()
1719
 
    """
1720
 
 
1721
 
    runtime_expansions = (Client.runtime_expansions
1722
 
                          + ("dbus_object_path", ))
1723
 
 
1724
 
    _interface = "se.recompile.Mandos.Client"
1725
 
 
1726
 
    # dbus.service.Object doesn't use super(), so we can't either.
1727
 
 
1728
 
    def __init__(self, bus=None, *args, **kwargs):
1729
 
        self.bus = bus
1730
 
        Client.__init__(self, *args, **kwargs)
1731
 
        # Only now, when this client is initialized, can it show up on
1732
 
        # the D-Bus
1733
 
        client_object_name = str(self.name).translate(
1734
 
            {ord("."): ord("_"),
1735
 
             ord("-"): ord("_")})
1736
 
        self.dbus_object_path = dbus.ObjectPath(
1737
 
            "/clients/" + client_object_name)
1738
 
        DBusObjectWithProperties.__init__(self, self.bus,
1739
 
                                          self.dbus_object_path)
1740
 
 
1741
 
    def notifychangeproperty(transform_func, dbus_name,
1742
 
                             type_func=lambda x: x,
1743
 
                             variant_level=1,
1744
 
                             invalidate_only=False,
1745
 
                             _interface=_interface):
1746
 
        """ Modify a variable so that it's a property which announces
1747
 
        its changes to DBus.
1748
 
 
1749
 
        transform_fun: Function that takes a value and a variant_level
1750
 
                       and transforms it to a D-Bus type.
1751
 
        dbus_name: D-Bus name of the variable
1752
 
        type_func: Function that transform the value before sending it
1753
 
                   to the D-Bus.  Default: no transform
1754
 
        variant_level: D-Bus variant level.  Default: 1
1755
 
        """
1756
 
        attrname = "_{}".format(dbus_name)
1757
 
 
1758
 
        def setter(self, value):
1759
 
            if hasattr(self, "dbus_object_path"):
1760
 
                if (not hasattr(self, attrname) or
1761
 
                    type_func(getattr(self, attrname, None))
1762
 
                    != type_func(value)):
1763
 
                    if invalidate_only:
1764
 
                        self.PropertiesChanged(
1765
 
                            _interface, dbus.Dictionary(),
1766
 
                            dbus.Array((dbus_name, )))
1767
 
                    else:
1768
 
                        dbus_value = transform_func(
1769
 
                            type_func(value),
1770
 
                            variant_level=variant_level)
1771
 
                        self.PropertyChanged(dbus.String(dbus_name),
1772
 
                                             dbus_value)
1773
 
                        self.PropertiesChanged(
1774
 
                            _interface,
1775
 
                            dbus.Dictionary({dbus.String(dbus_name):
1776
 
                                             dbus_value}),
1777
 
                            dbus.Array())
1778
 
            setattr(self, attrname, value)
1779
 
 
1780
 
        return property(lambda self: getattr(self, attrname), setter)
1781
 
 
1782
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
1783
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
1784
 
                                             "ApprovalPending",
1785
 
                                             type_func=bool)
1786
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1787
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
1788
 
                                        "LastEnabled")
1789
 
    checker = notifychangeproperty(
1790
 
        dbus.Boolean, "CheckerRunning",
1791
 
        type_func=lambda checker: checker is not None)
1792
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
1793
 
                                           "LastCheckedOK")
1794
 
    last_checker_status = notifychangeproperty(dbus.Int16,
1795
 
                                               "LastCheckerStatus")
1796
 
    last_approval_request = notifychangeproperty(
1797
 
        datetime_to_dbus, "LastApprovalRequest")
1798
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
1799
 
                                               "ApprovedByDefault")
1800
 
    approval_delay = notifychangeproperty(
1801
 
        dbus.UInt64, "ApprovalDelay",
1802
 
        type_func=lambda td: td.total_seconds() * 1000)
1803
 
    approval_duration = notifychangeproperty(
1804
 
        dbus.UInt64, "ApprovalDuration",
1805
 
        type_func=lambda td: td.total_seconds() * 1000)
1806
 
    host = notifychangeproperty(dbus.String, "Host")
1807
 
    timeout = notifychangeproperty(
1808
 
        dbus.UInt64, "Timeout",
1809
 
        type_func=lambda td: td.total_seconds() * 1000)
1810
 
    extended_timeout = notifychangeproperty(
1811
 
        dbus.UInt64, "ExtendedTimeout",
1812
 
        type_func=lambda td: td.total_seconds() * 1000)
1813
 
    interval = notifychangeproperty(
1814
 
        dbus.UInt64, "Interval",
1815
 
        type_func=lambda td: td.total_seconds() * 1000)
1816
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
1817
 
    secret = notifychangeproperty(dbus.ByteArray, "Secret",
1818
 
                                  invalidate_only=True)
1819
 
 
1820
 
    del notifychangeproperty
1821
 
 
1822
 
    def __del__(self, *args, **kwargs):
1823
 
        try:
1824
 
            self.remove_from_connection()
1825
 
        except LookupError:
1826
 
            pass
1827
 
        if hasattr(DBusObjectWithProperties, "__del__"):
1828
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
1829
 
        Client.__del__(self, *args, **kwargs)
1830
 
 
1831
 
    def checker_callback(self, source, condition,
1832
 
                         connection, command, *args, **kwargs):
1833
 
        ret = Client.checker_callback(self, source, condition,
1834
 
                                      connection, command, *args,
1835
 
                                      **kwargs)
1836
 
        exitstatus = self.last_checker_status
1837
 
        if exitstatus >= 0:
1838
 
            # Emit D-Bus signal
1839
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
1840
 
                                  # This is specific to GNU libC
1841
 
                                  dbus.Int64(exitstatus << 8),
1842
 
                                  dbus.String(command))
 
438
        if self.use_dbus:
 
439
            self.PropertyChanged(dbus.String(u"checker_running"),
 
440
                                 dbus.Boolean(False, variant_level=1))
 
441
    
 
442
    def still_valid(self):
 
443
        """Has the timeout not yet passed for this client?"""
 
444
        if not getattr(self, "enabled", False):
 
445
            return False
 
446
        now = datetime.datetime.utcnow()
 
447
        if self.last_checked_ok is None:
 
448
            return now < (self.created + self.timeout)
1843
449
        else:
1844
 
            # Emit D-Bus signal
1845
 
            self.CheckerCompleted(dbus.Int16(-1),
1846
 
                                  dbus.Int64(
1847
 
                                      # This is specific to GNU libC
1848
 
                                      (exitstatus << 8)
1849
 
                                      | self.last_checker_signal),
1850
 
                                  dbus.String(command))
1851
 
        return ret
1852
 
 
1853
 
    def start_checker(self, *args, **kwargs):
1854
 
        old_checker_pid = getattr(self.checker, "pid", None)
1855
 
        r = Client.start_checker(self, *args, **kwargs)
1856
 
        # Only if new checker process was started
1857
 
        if (self.checker is not None
1858
 
            and old_checker_pid != self.checker.pid):
1859
 
            # Emit D-Bus signal
1860
 
            self.CheckerStarted(self.current_checker_command)
1861
 
        return r
1862
 
 
1863
 
    def _reset_approved(self):
1864
 
        self.approved = None
1865
 
        return False
1866
 
 
1867
 
    def approve(self, value=True):
1868
 
        self.approved = value
1869
 
        GLib.timeout_add(int(self.approval_duration.total_seconds()
1870
 
                             * 1000), self._reset_approved)
1871
 
        self.send_changedstate()
1872
 
 
1873
 
    #  D-Bus methods, signals & properties
1874
 
 
1875
 
    #  Interfaces
1876
 
 
1877
 
    #  Signals
1878
 
 
 
450
            return now < (self.last_checked_ok + self.timeout)
 
451
    
 
452
    ## D-Bus methods & signals
 
453
    _interface = u"se.bsnet.fukt.Mandos.Client"
 
454
    
 
455
    # CheckedOK - method
 
456
    CheckedOK = dbus.service.method(_interface)(checked_ok)
 
457
    CheckedOK.__name__ = "CheckedOK"
 
458
    
1879
459
    # CheckerCompleted - signal
1880
460
    @dbus.service.signal(_interface, signature="nxs")
1881
461
    def CheckerCompleted(self, exitcode, waitstatus, command):
1882
462
        "D-Bus signal"
1883
463
        pass
1884
 
 
 
464
    
1885
465
    # CheckerStarted - signal
1886
466
    @dbus.service.signal(_interface, signature="s")
1887
467
    def CheckerStarted(self, command):
1888
468
        "D-Bus signal"
1889
469
        pass
1890
 
 
 
470
    
 
471
    # GetAllProperties - method
 
472
    @dbus.service.method(_interface, out_signature="a{sv}")
 
473
    def GetAllProperties(self):
 
474
        "D-Bus method"
 
475
        return dbus.Dictionary({
 
476
                dbus.String("name"):
 
477
                    dbus.String(self.name, variant_level=1),
 
478
                dbus.String("fingerprint"):
 
479
                    dbus.String(self.fingerprint, variant_level=1),
 
480
                dbus.String("host"):
 
481
                    dbus.String(self.host, variant_level=1),
 
482
                dbus.String("created"):
 
483
                    _datetime_to_dbus(self.created, variant_level=1),
 
484
                dbus.String("last_enabled"):
 
485
                    (_datetime_to_dbus(self.last_enabled,
 
486
                                       variant_level=1)
 
487
                     if self.last_enabled is not None
 
488
                     else dbus.Boolean(False, variant_level=1)),
 
489
                dbus.String("enabled"):
 
490
                    dbus.Boolean(self.enabled, variant_level=1),
 
491
                dbus.String("last_checked_ok"):
 
492
                    (_datetime_to_dbus(self.last_checked_ok,
 
493
                                       variant_level=1)
 
494
                     if self.last_checked_ok is not None
 
495
                     else dbus.Boolean (False, variant_level=1)),
 
496
                dbus.String("timeout"):
 
497
                    dbus.UInt64(self.timeout_milliseconds(),
 
498
                                variant_level=1),
 
499
                dbus.String("interval"):
 
500
                    dbus.UInt64(self.interval_milliseconds(),
 
501
                                variant_level=1),
 
502
                dbus.String("checker"):
 
503
                    dbus.String(self.checker_command,
 
504
                                variant_level=1),
 
505
                dbus.String("checker_running"):
 
506
                    dbus.Boolean(self.checker is not None,
 
507
                                 variant_level=1),
 
508
                dbus.String("object_path"):
 
509
                    dbus.ObjectPath(self.dbus_object_path,
 
510
                                    variant_level=1)
 
511
                }, signature="sv")
 
512
    
 
513
    # IsStillValid - method
 
514
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
 
515
                    (still_valid))
 
516
    IsStillValid.__name__ = "IsStillValid"
 
517
    
1891
518
    # PropertyChanged - signal
1892
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1893
519
    @dbus.service.signal(_interface, signature="sv")
1894
520
    def PropertyChanged(self, property, value):
1895
521
        "D-Bus signal"
1896
522
        pass
1897
 
 
1898
 
    # GotSecret - signal
1899
 
    @dbus.service.signal(_interface)
1900
 
    def GotSecret(self):
1901
 
        """D-Bus signal
1902
 
        Is sent after a successful transfer of secret from the Mandos
1903
 
        server to mandos-client
1904
 
        """
1905
 
        pass
1906
 
 
1907
 
    # Rejected - signal
1908
 
    @dbus.service.signal(_interface, signature="s")
1909
 
    def Rejected(self, reason):
1910
 
        "D-Bus signal"
1911
 
        pass
1912
 
 
1913
 
    # NeedApproval - signal
1914
 
    @dbus.service.signal(_interface, signature="tb")
1915
 
    def NeedApproval(self, timeout, default):
1916
 
        "D-Bus signal"
1917
 
        return self.need_approval()
1918
 
 
1919
 
    #  Methods
1920
 
 
1921
 
    # Approve - method
1922
 
    @dbus.service.method(_interface, in_signature="b")
1923
 
    def Approve(self, value):
1924
 
        self.approve(value)
1925
 
 
1926
 
    # CheckedOK - method
1927
 
    @dbus.service.method(_interface)
1928
 
    def CheckedOK(self):
1929
 
        self.checked_ok()
1930
 
 
 
523
    
 
524
    # SetChecker - method
 
525
    @dbus.service.method(_interface, in_signature="s")
 
526
    def SetChecker(self, checker):
 
527
        "D-Bus setter method"
 
528
        self.checker_command = checker
 
529
        # Emit D-Bus signal
 
530
        self.PropertyChanged(dbus.String(u"checker"),
 
531
                             dbus.String(self.checker_command,
 
532
                                         variant_level=1))
 
533
    
 
534
    # SetHost - method
 
535
    @dbus.service.method(_interface, in_signature="s")
 
536
    def SetHost(self, host):
 
537
        "D-Bus setter method"
 
538
        self.host = host
 
539
        # Emit D-Bus signal
 
540
        self.PropertyChanged(dbus.String(u"host"),
 
541
                             dbus.String(self.host, variant_level=1))
 
542
    
 
543
    # SetInterval - method
 
544
    @dbus.service.method(_interface, in_signature="t")
 
545
    def SetInterval(self, milliseconds):
 
546
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
 
547
        # Emit D-Bus signal
 
548
        self.PropertyChanged(dbus.String(u"interval"),
 
549
                             (dbus.UInt64(self.interval_milliseconds(),
 
550
                                          variant_level=1)))
 
551
    
 
552
    # SetSecret - method
 
553
    @dbus.service.method(_interface, in_signature="ay",
 
554
                         byte_arrays=True)
 
555
    def SetSecret(self, secret):
 
556
        "D-Bus setter method"
 
557
        self.secret = str(secret)
 
558
    
 
559
    # SetTimeout - method
 
560
    @dbus.service.method(_interface, in_signature="t")
 
561
    def SetTimeout(self, milliseconds):
 
562
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
 
563
        # Emit D-Bus signal
 
564
        self.PropertyChanged(dbus.String(u"timeout"),
 
565
                             (dbus.UInt64(self.timeout_milliseconds(),
 
566
                                          variant_level=1)))
 
567
    
1931
568
    # Enable - method
1932
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1933
 
    @dbus.service.method(_interface)
1934
 
    def Enable(self):
1935
 
        "D-Bus method"
1936
 
        self.enable()
1937
 
 
 
569
    Enable = dbus.service.method(_interface)(enable)
 
570
    Enable.__name__ = "Enable"
 
571
    
1938
572
    # StartChecker - method
1939
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1940
573
    @dbus.service.method(_interface)
1941
574
    def StartChecker(self):
1942
575
        "D-Bus method"
1943
576
        self.start_checker()
1944
 
 
 
577
    
1945
578
    # Disable - method
1946
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1947
579
    @dbus.service.method(_interface)
1948
580
    def Disable(self):
1949
581
        "D-Bus method"
1950
582
        self.disable()
1951
 
 
 
583
    
1952
584
    # StopChecker - method
1953
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1954
 
    @dbus.service.method(_interface)
1955
 
    def StopChecker(self):
1956
 
        self.stop_checker()
1957
 
 
1958
 
    #  Properties
1959
 
 
1960
 
    # ApprovalPending - property
1961
 
    @dbus_service_property(_interface, signature="b", access="read")
1962
 
    def ApprovalPending_dbus_property(self):
1963
 
        return dbus.Boolean(bool(self.approvals_pending))
1964
 
 
1965
 
    # ApprovedByDefault - property
1966
 
    @dbus_service_property(_interface,
1967
 
                           signature="b",
1968
 
                           access="readwrite")
1969
 
    def ApprovedByDefault_dbus_property(self, value=None):
1970
 
        if value is None:       # get
1971
 
            return dbus.Boolean(self.approved_by_default)
1972
 
        self.approved_by_default = bool(value)
1973
 
 
1974
 
    # ApprovalDelay - property
1975
 
    @dbus_service_property(_interface,
1976
 
                           signature="t",
1977
 
                           access="readwrite")
1978
 
    def ApprovalDelay_dbus_property(self, value=None):
1979
 
        if value is None:       # get
1980
 
            return dbus.UInt64(self.approval_delay.total_seconds()
1981
 
                               * 1000)
1982
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
1983
 
 
1984
 
    # ApprovalDuration - property
1985
 
    @dbus_service_property(_interface,
1986
 
                           signature="t",
1987
 
                           access="readwrite")
1988
 
    def ApprovalDuration_dbus_property(self, value=None):
1989
 
        if value is None:       # get
1990
 
            return dbus.UInt64(self.approval_duration.total_seconds()
1991
 
                               * 1000)
1992
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
1993
 
 
1994
 
    # Name - property
1995
 
    @dbus_annotations(
1996
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
1997
 
    @dbus_service_property(_interface, signature="s", access="read")
1998
 
    def Name_dbus_property(self):
1999
 
        return dbus.String(self.name)
2000
 
 
2001
 
    # Fingerprint - property
2002
 
    @dbus_annotations(
2003
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2004
 
    @dbus_service_property(_interface, signature="s", access="read")
2005
 
    def Fingerprint_dbus_property(self):
2006
 
        return dbus.String(self.fingerprint)
2007
 
 
2008
 
    # Host - property
2009
 
    @dbus_service_property(_interface,
2010
 
                           signature="s",
2011
 
                           access="readwrite")
2012
 
    def Host_dbus_property(self, value=None):
2013
 
        if value is None:       # get
2014
 
            return dbus.String(self.host)
2015
 
        self.host = str(value)
2016
 
 
2017
 
    # Created - property
2018
 
    @dbus_annotations(
2019
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2020
 
    @dbus_service_property(_interface, signature="s", access="read")
2021
 
    def Created_dbus_property(self):
2022
 
        return datetime_to_dbus(self.created)
2023
 
 
2024
 
    # LastEnabled - property
2025
 
    @dbus_service_property(_interface, signature="s", access="read")
2026
 
    def LastEnabled_dbus_property(self):
2027
 
        return datetime_to_dbus(self.last_enabled)
2028
 
 
2029
 
    # Enabled - property
2030
 
    @dbus_service_property(_interface,
2031
 
                           signature="b",
2032
 
                           access="readwrite")
2033
 
    def Enabled_dbus_property(self, value=None):
2034
 
        if value is None:       # get
2035
 
            return dbus.Boolean(self.enabled)
2036
 
        if value:
2037
 
            self.enable()
2038
 
        else:
2039
 
            self.disable()
2040
 
 
2041
 
    # LastCheckedOK - property
2042
 
    @dbus_service_property(_interface,
2043
 
                           signature="s",
2044
 
                           access="readwrite")
2045
 
    def LastCheckedOK_dbus_property(self, value=None):
2046
 
        if value is not None:
2047
 
            self.checked_ok()
2048
 
            return
2049
 
        return datetime_to_dbus(self.last_checked_ok)
2050
 
 
2051
 
    # LastCheckerStatus - property
2052
 
    @dbus_service_property(_interface, signature="n", access="read")
2053
 
    def LastCheckerStatus_dbus_property(self):
2054
 
        return dbus.Int16(self.last_checker_status)
2055
 
 
2056
 
    # Expires - property
2057
 
    @dbus_service_property(_interface, signature="s", access="read")
2058
 
    def Expires_dbus_property(self):
2059
 
        return datetime_to_dbus(self.expires)
2060
 
 
2061
 
    # LastApprovalRequest - property
2062
 
    @dbus_service_property(_interface, signature="s", access="read")
2063
 
    def LastApprovalRequest_dbus_property(self):
2064
 
        return datetime_to_dbus(self.last_approval_request)
2065
 
 
2066
 
    # Timeout - property
2067
 
    @dbus_service_property(_interface,
2068
 
                           signature="t",
2069
 
                           access="readwrite")
2070
 
    def Timeout_dbus_property(self, value=None):
2071
 
        if value is None:       # get
2072
 
            return dbus.UInt64(self.timeout.total_seconds() * 1000)
2073
 
        old_timeout = self.timeout
2074
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
2075
 
        # Reschedule disabling
2076
 
        if self.enabled:
2077
 
            now = datetime.datetime.utcnow()
2078
 
            self.expires += self.timeout - old_timeout
2079
 
            if self.expires <= now:
2080
 
                # The timeout has passed
2081
 
                self.disable()
2082
 
            else:
2083
 
                if (getattr(self, "disable_initiator_tag", None)
2084
 
                    is None):
2085
 
                    return
2086
 
                GLib.source_remove(self.disable_initiator_tag)
2087
 
                self.disable_initiator_tag = GLib.timeout_add(
2088
 
                    int((self.expires - now).total_seconds() * 1000),
2089
 
                    self.disable)
2090
 
 
2091
 
    # ExtendedTimeout - property
2092
 
    @dbus_service_property(_interface,
2093
 
                           signature="t",
2094
 
                           access="readwrite")
2095
 
    def ExtendedTimeout_dbus_property(self, value=None):
2096
 
        if value is None:       # get
2097
 
            return dbus.UInt64(self.extended_timeout.total_seconds()
2098
 
                               * 1000)
2099
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
2100
 
 
2101
 
    # Interval - property
2102
 
    @dbus_service_property(_interface,
2103
 
                           signature="t",
2104
 
                           access="readwrite")
2105
 
    def Interval_dbus_property(self, value=None):
2106
 
        if value is None:       # get
2107
 
            return dbus.UInt64(self.interval.total_seconds() * 1000)
2108
 
        self.interval = datetime.timedelta(0, 0, 0, value)
2109
 
        if getattr(self, "checker_initiator_tag", None) is None:
2110
 
            return
2111
 
        if self.enabled:
2112
 
            # Reschedule checker run
2113
 
            GLib.source_remove(self.checker_initiator_tag)
2114
 
            self.checker_initiator_tag = GLib.timeout_add(
2115
 
                value, self.start_checker)
2116
 
            self.start_checker()  # Start one now, too
2117
 
 
2118
 
    # Checker - property
2119
 
    @dbus_service_property(_interface,
2120
 
                           signature="s",
2121
 
                           access="readwrite")
2122
 
    def Checker_dbus_property(self, value=None):
2123
 
        if value is None:       # get
2124
 
            return dbus.String(self.checker_command)
2125
 
        self.checker_command = str(value)
2126
 
 
2127
 
    # CheckerRunning - property
2128
 
    @dbus_service_property(_interface,
2129
 
                           signature="b",
2130
 
                           access="readwrite")
2131
 
    def CheckerRunning_dbus_property(self, value=None):
2132
 
        if value is None:       # get
2133
 
            return dbus.Boolean(self.checker is not None)
2134
 
        if value:
2135
 
            self.start_checker()
2136
 
        else:
2137
 
            self.stop_checker()
2138
 
 
2139
 
    # ObjectPath - property
2140
 
    @dbus_annotations(
2141
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",
2142
 
         "org.freedesktop.DBus.Deprecated": "true"})
2143
 
    @dbus_service_property(_interface, signature="o", access="read")
2144
 
    def ObjectPath_dbus_property(self):
2145
 
        return self.dbus_object_path  # is already a dbus.ObjectPath
2146
 
 
2147
 
    # Secret = property
2148
 
    @dbus_annotations(
2149
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal":
2150
 
         "invalidates"})
2151
 
    @dbus_service_property(_interface,
2152
 
                           signature="ay",
2153
 
                           access="write",
2154
 
                           byte_arrays=True)
2155
 
    def Secret_dbus_property(self, value):
2156
 
        self.secret = bytes(value)
2157
 
 
 
585
    StopChecker = dbus.service.method(_interface)(stop_checker)
 
586
    StopChecker.__name__ = "StopChecker"
 
587
    
2158
588
    del _interface
2159
589
 
2160
590
 
2161
 
class ProxyClient(object):
2162
 
    def __init__(self, child_pipe, fpr, address):
2163
 
        self._pipe = child_pipe
2164
 
        self._pipe.send(('init', fpr, address))
2165
 
        if not self._pipe.recv():
2166
 
            raise KeyError(fpr)
2167
 
 
2168
 
    def __getattribute__(self, name):
2169
 
        if name == '_pipe':
2170
 
            return super(ProxyClient, self).__getattribute__(name)
2171
 
        self._pipe.send(('getattr', name))
2172
 
        data = self._pipe.recv()
2173
 
        if data[0] == 'data':
2174
 
            return data[1]
2175
 
        if data[0] == 'function':
2176
 
 
2177
 
            def func(*args, **kwargs):
2178
 
                self._pipe.send(('funcall', name, args, kwargs))
2179
 
                return self._pipe.recv()[1]
2180
 
 
2181
 
            return func
2182
 
 
2183
 
    def __setattr__(self, name, value):
2184
 
        if name == '_pipe':
2185
 
            return super(ProxyClient, self).__setattr__(name, value)
2186
 
        self._pipe.send(('setattr', name, value))
2187
 
 
2188
 
 
2189
 
class ClientHandler(socketserver.BaseRequestHandler, object):
2190
 
    """A class to handle client connections.
2191
 
 
2192
 
    Instantiated once for each connection to handle it.
 
591
def peer_certificate(session):
 
592
    "Return the peer's OpenPGP certificate as a bytestring"
 
593
    # If not an OpenPGP certificate...
 
594
    if (gnutls.library.functions
 
595
        .gnutls_certificate_type_get(session._c_object)
 
596
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
597
        # ...do the normal thing
 
598
        return session.peer_certificate
 
599
    list_size = ctypes.c_uint(1)
 
600
    cert_list = (gnutls.library.functions
 
601
                 .gnutls_certificate_get_peers
 
602
                 (session._c_object, ctypes.byref(list_size)))
 
603
    if not bool(cert_list) and list_size.value != 0:
 
604
        raise gnutls.errors.GNUTLSError("error getting peer"
 
605
                                        " certificate")
 
606
    if list_size.value == 0:
 
607
        return None
 
608
    cert = cert_list[0]
 
609
    return ctypes.string_at(cert.data, cert.size)
 
610
 
 
611
 
 
612
def fingerprint(openpgp):
 
613
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
614
    # New GnuTLS "datum" with the OpenPGP public key
 
615
    datum = (gnutls.library.types
 
616
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
617
                                         ctypes.POINTER
 
618
                                         (ctypes.c_ubyte)),
 
619
                             ctypes.c_uint(len(openpgp))))
 
620
    # New empty GnuTLS certificate
 
621
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
622
    (gnutls.library.functions
 
623
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
624
    # Import the OpenPGP public key into the certificate
 
625
    (gnutls.library.functions
 
626
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
627
                                gnutls.library.constants
 
628
                                .GNUTLS_OPENPGP_FMT_RAW))
 
629
    # Verify the self signature in the key
 
630
    crtverify = ctypes.c_uint()
 
631
    (gnutls.library.functions
 
632
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
 
633
    if crtverify.value != 0:
 
634
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
635
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
636
    # New buffer for the fingerprint
 
637
    buf = ctypes.create_string_buffer(20)
 
638
    buf_len = ctypes.c_size_t()
 
639
    # Get the fingerprint from the certificate into the buffer
 
640
    (gnutls.library.functions
 
641
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
642
                                         ctypes.byref(buf_len)))
 
643
    # Deinit the certificate
 
644
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
645
    # Convert the buffer to a Python bytestring
 
646
    fpr = ctypes.string_at(buf, buf_len.value)
 
647
    # Convert the bytestring to hexadecimal notation
 
648
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
649
    return hex_fpr
 
650
 
 
651
 
 
652
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
653
    """A TCP request handler class.
 
654
    Instantiated by IPv6_TCPServer for each request to handle it.
2193
655
    Note: This will run in its own forked process."""
2194
 
 
 
656
    
2195
657
    def handle(self):
2196
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
2197
 
            logger.info("TCP connection from: %s",
2198
 
                        str(self.client_address))
2199
 
            logger.debug("Pipe FD: %d",
2200
 
                         self.server.child_pipe.fileno())
2201
 
 
2202
 
            session = gnutls.ClientSession(self.request)
2203
 
 
2204
 
            # priority = ':'.join(("NONE", "+VERS-TLS1.1",
2205
 
            #                       "+AES-256-CBC", "+SHA1",
2206
 
            #                       "+COMP-NULL", "+CTYPE-OPENPGP",
2207
 
            #                       "+DHE-DSS"))
2208
 
            # Use a fallback default, since this MUST be set.
2209
 
            priority = self.server.gnutls_priority
2210
 
            if priority is None:
2211
 
                priority = "NORMAL"
2212
 
            gnutls.priority_set_direct(session._c_object,
2213
 
                                       priority.encode("utf-8"),
2214
 
                                       None)
2215
 
 
2216
 
            # Start communication using the Mandos protocol
2217
 
            # Get protocol number
2218
 
            line = self.request.makefile().readline()
2219
 
            logger.debug("Protocol version: %r", line)
2220
 
            try:
2221
 
                if int(line.strip().split()[0]) > 1:
2222
 
                    raise RuntimeError(line)
2223
 
            except (ValueError, IndexError, RuntimeError) as error:
2224
 
                logger.error("Unknown protocol version: %s", error)
2225
 
                return
2226
 
 
2227
 
            # Start GnuTLS connection
2228
 
            try:
2229
 
                session.handshake()
2230
 
            except gnutls.Error as error:
2231
 
                logger.warning("Handshake failed: %s", error)
2232
 
                # Do not run session.bye() here: the session is not
2233
 
                # established.  Just abandon the request.
2234
 
                return
2235
 
            logger.debug("Handshake succeeded")
2236
 
 
2237
 
            approval_required = False
2238
 
            try:
2239
 
                try:
2240
 
                    fpr = self.fingerprint(
2241
 
                        self.peer_certificate(session))
2242
 
                except (TypeError, gnutls.Error) as error:
2243
 
                    logger.warning("Bad certificate: %s", error)
2244
 
                    return
2245
 
                logger.debug("Fingerprint: %s", fpr)
2246
 
 
2247
 
                try:
2248
 
                    client = ProxyClient(child_pipe, fpr,
2249
 
                                         self.client_address)
2250
 
                except KeyError:
2251
 
                    return
2252
 
 
2253
 
                if client.approval_delay:
2254
 
                    delay = client.approval_delay
2255
 
                    client.approvals_pending += 1
2256
 
                    approval_required = True
2257
 
 
2258
 
                while True:
2259
 
                    if not client.enabled:
2260
 
                        logger.info("Client %s is disabled",
2261
 
                                    client.name)
2262
 
                        if self.server.use_dbus:
2263
 
                            # Emit D-Bus signal
2264
 
                            client.Rejected("Disabled")
2265
 
                        return
2266
 
 
2267
 
                    if client.approved or not client.approval_delay:
2268
 
                        # We are approved or approval is disabled
2269
 
                        break
2270
 
                    elif client.approved is None:
2271
 
                        logger.info("Client %s needs approval",
2272
 
                                    client.name)
2273
 
                        if self.server.use_dbus:
2274
 
                            # Emit D-Bus signal
2275
 
                            client.NeedApproval(
2276
 
                                client.approval_delay.total_seconds()
2277
 
                                * 1000, client.approved_by_default)
2278
 
                    else:
2279
 
                        logger.warning("Client %s was not approved",
2280
 
                                       client.name)
2281
 
                        if self.server.use_dbus:
2282
 
                            # Emit D-Bus signal
2283
 
                            client.Rejected("Denied")
2284
 
                        return
2285
 
 
2286
 
                    # wait until timeout or approved
2287
 
                    time = datetime.datetime.now()
2288
 
                    client.changedstate.acquire()
2289
 
                    client.changedstate.wait(delay.total_seconds())
2290
 
                    client.changedstate.release()
2291
 
                    time2 = datetime.datetime.now()
2292
 
                    if (time2 - time) >= delay:
2293
 
                        if not client.approved_by_default:
2294
 
                            logger.warning("Client %s timed out while"
2295
 
                                           " waiting for approval",
2296
 
                                           client.name)
2297
 
                            if self.server.use_dbus:
2298
 
                                # Emit D-Bus signal
2299
 
                                client.Rejected("Approval timed out")
2300
 
                            return
2301
 
                        else:
2302
 
                            break
2303
 
                    else:
2304
 
                        delay -= time2 - time
2305
 
 
2306
 
                try:
2307
 
                    session.send(client.secret)
2308
 
                except gnutls.Error as error:
2309
 
                    logger.warning("gnutls send failed",
2310
 
                                   exc_info=error)
2311
 
                    return
2312
 
 
2313
 
                logger.info("Sending secret to %s", client.name)
2314
 
                # bump the timeout using extended_timeout
2315
 
                client.bump_timeout(client.extended_timeout)
2316
 
                if self.server.use_dbus:
2317
 
                    # Emit D-Bus signal
2318
 
                    client.GotSecret()
2319
 
 
2320
 
            finally:
2321
 
                if approval_required:
2322
 
                    client.approvals_pending -= 1
2323
 
                try:
2324
 
                    session.bye()
2325
 
                except gnutls.Error as error:
2326
 
                    logger.warning("GnuTLS bye failed",
2327
 
                                   exc_info=error)
2328
 
 
2329
 
    @staticmethod
2330
 
    def peer_certificate(session):
2331
 
        "Return the peer's OpenPGP certificate as a bytestring"
2332
 
        # If not an OpenPGP certificate...
2333
 
        if (gnutls.certificate_type_get(session._c_object)
2334
 
            != gnutls.CRT_OPENPGP):
2335
 
            # ...return invalid data
2336
 
            return b""
2337
 
        list_size = ctypes.c_uint(1)
2338
 
        cert_list = (gnutls.certificate_get_peers
2339
 
                     (session._c_object, ctypes.byref(list_size)))
2340
 
        if not bool(cert_list) and list_size.value != 0:
2341
 
            raise gnutls.Error("error getting peer certificate")
2342
 
        if list_size.value == 0:
2343
 
            return None
2344
 
        cert = cert_list[0]
2345
 
        return ctypes.string_at(cert.data, cert.size)
2346
 
 
2347
 
    @staticmethod
2348
 
    def fingerprint(openpgp):
2349
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
2350
 
        # New GnuTLS "datum" with the OpenPGP public key
2351
 
        datum = gnutls.datum_t(
2352
 
            ctypes.cast(ctypes.c_char_p(openpgp),
2353
 
                        ctypes.POINTER(ctypes.c_ubyte)),
2354
 
            ctypes.c_uint(len(openpgp)))
2355
 
        # New empty GnuTLS certificate
2356
 
        crt = gnutls.openpgp_crt_t()
2357
 
        gnutls.openpgp_crt_init(ctypes.byref(crt))
2358
 
        # Import the OpenPGP public key into the certificate
2359
 
        gnutls.openpgp_crt_import(crt, ctypes.byref(datum),
2360
 
                                  gnutls.OPENPGP_FMT_RAW)
2361
 
        # Verify the self signature in the key
2362
 
        crtverify = ctypes.c_uint()
2363
 
        gnutls.openpgp_crt_verify_self(crt, 0,
2364
 
                                       ctypes.byref(crtverify))
2365
 
        if crtverify.value != 0:
2366
 
            gnutls.openpgp_crt_deinit(crt)
2367
 
            raise gnutls.CertificateSecurityError("Verify failed")
2368
 
        # New buffer for the fingerprint
2369
 
        buf = ctypes.create_string_buffer(20)
2370
 
        buf_len = ctypes.c_size_t()
2371
 
        # Get the fingerprint from the certificate into the buffer
2372
 
        gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
2373
 
                                           ctypes.byref(buf_len))
2374
 
        # Deinit the certificate
2375
 
        gnutls.openpgp_crt_deinit(crt)
2376
 
        # Convert the buffer to a Python bytestring
2377
 
        fpr = ctypes.string_at(buf, buf_len.value)
2378
 
        # Convert the bytestring to hexadecimal notation
2379
 
        hex_fpr = binascii.hexlify(fpr).upper()
2380
 
        return hex_fpr
2381
 
 
2382
 
 
2383
 
class MultiprocessingMixIn(object):
2384
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
2385
 
 
2386
 
    def sub_process_main(self, request, address):
2387
 
        try:
2388
 
            self.finish_request(request, address)
2389
 
        except Exception:
2390
 
            self.handle_error(request, address)
2391
 
        self.close_request(request)
2392
 
 
2393
 
    def process_request(self, request, address):
2394
 
        """Start a new process to process the request."""
2395
 
        proc = multiprocessing.Process(target=self.sub_process_main,
2396
 
                                       args=(request, address))
2397
 
        proc.start()
2398
 
        return proc
2399
 
 
2400
 
 
2401
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
2402
 
    """ adds a pipe to the MixIn """
2403
 
 
2404
 
    def process_request(self, request, client_address):
2405
 
        """Overrides and wraps the original process_request().
2406
 
 
2407
 
        This function creates a new pipe in self.pipe
2408
 
        """
2409
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
2410
 
 
2411
 
        proc = MultiprocessingMixIn.process_request(self, request,
2412
 
                                                    client_address)
2413
 
        self.child_pipe.close()
2414
 
        self.add_pipe(parent_pipe, proc)
2415
 
 
2416
 
    def add_pipe(self, parent_pipe, proc):
2417
 
        """Dummy function; override as necessary"""
2418
 
        raise NotImplementedError()
2419
 
 
2420
 
 
2421
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
2422
 
                     socketserver.TCPServer, object):
2423
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
2424
 
 
 
658
        logger.info(u"TCP connection from: %s",
 
659
                    unicode(self.client_address))
 
660
        session = (gnutls.connection
 
661
                   .ClientSession(self.request,
 
662
                                  gnutls.connection
 
663
                                  .X509Credentials()))
 
664
        
 
665
        line = self.request.makefile().readline()
 
666
        logger.debug(u"Protocol version: %r", line)
 
667
        try:
 
668
            if int(line.strip().split()[0]) > 1:
 
669
                raise RuntimeError
 
670
        except (ValueError, IndexError, RuntimeError), error:
 
671
            logger.error(u"Unknown protocol version: %s", error)
 
672
            return
 
673
        
 
674
        # Note: gnutls.connection.X509Credentials is really a generic
 
675
        # GnuTLS certificate credentials object so long as no X.509
 
676
        # keys are added to it.  Therefore, we can use it here despite
 
677
        # using OpenPGP certificates.
 
678
        
 
679
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
680
        #                     "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
681
        #                     "+DHE-DSS"))
 
682
        # Use a fallback default, since this MUST be set.
 
683
        priority = self.server.settings.get("priority", "NORMAL")
 
684
        (gnutls.library.functions
 
685
         .gnutls_priority_set_direct(session._c_object,
 
686
                                     priority, None))
 
687
        
 
688
        try:
 
689
            session.handshake()
 
690
        except gnutls.errors.GNUTLSError, error:
 
691
            logger.warning(u"Handshake failed: %s", error)
 
692
            # Do not run session.bye() here: the session is not
 
693
            # established.  Just abandon the request.
 
694
            return
 
695
        logger.debug(u"Handshake succeeded")
 
696
        try:
 
697
            fpr = fingerprint(peer_certificate(session))
 
698
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
699
            logger.warning(u"Bad certificate: %s", error)
 
700
            session.bye()
 
701
            return
 
702
        logger.debug(u"Fingerprint: %s", fpr)
 
703
        
 
704
        for c in self.server.clients:
 
705
            if c.fingerprint == fpr:
 
706
                client = c
 
707
                break
 
708
        else:
 
709
            logger.warning(u"Client not found for fingerprint: %s",
 
710
                           fpr)
 
711
            session.bye()
 
712
            return
 
713
        # Have to check if client.still_valid(), since it is possible
 
714
        # that the client timed out while establishing the GnuTLS
 
715
        # session.
 
716
        if not client.still_valid():
 
717
            logger.warning(u"Client %(name)s is invalid",
 
718
                           vars(client))
 
719
            session.bye()
 
720
            return
 
721
        ## This won't work here, since we're in a fork.
 
722
        # client.checked_ok()
 
723
        sent_size = 0
 
724
        while sent_size < len(client.secret):
 
725
            sent = session.send(client.secret[sent_size:])
 
726
            logger.debug(u"Sent: %d, remaining: %d",
 
727
                         sent, len(client.secret)
 
728
                         - (sent_size + sent))
 
729
            sent_size += sent
 
730
        session.bye()
 
731
 
 
732
 
 
733
class IPv6_TCPServer(SocketServer.ForkingMixIn,
 
734
                     SocketServer.TCPServer, object):
 
735
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
2425
736
    Attributes:
 
737
        settings:       Server settings
 
738
        clients:        Set() of Client objects
2426
739
        enabled:        Boolean; whether this server is activated yet
2427
 
        interface:      None or a network interface name (string)
2428
 
        use_ipv6:       Boolean; to use IPv6 or not
2429
740
    """
2430
 
 
2431
 
    def __init__(self, server_address, RequestHandlerClass,
2432
 
                 interface=None,
2433
 
                 use_ipv6=True,
2434
 
                 socketfd=None):
2435
 
        """If socketfd is set, use that file descriptor instead of
2436
 
        creating a new one with socket.socket().
2437
 
        """
2438
 
        self.interface = interface
2439
 
        if use_ipv6:
2440
 
            self.address_family = socket.AF_INET6
2441
 
        if socketfd is not None:
2442
 
            # Save the file descriptor
2443
 
            self.socketfd = socketfd
2444
 
            # Save the original socket.socket() function
2445
 
            self.socket_socket = socket.socket
2446
 
 
2447
 
            # To implement --socket, we monkey patch socket.socket.
2448
 
            #
2449
 
            # (When socketserver.TCPServer is a new-style class, we
2450
 
            # could make self.socket into a property instead of monkey
2451
 
            # patching socket.socket.)
2452
 
            #
2453
 
            # Create a one-time-only replacement for socket.socket()
2454
 
            @functools.wraps(socket.socket)
2455
 
            def socket_wrapper(*args, **kwargs):
2456
 
                # Restore original function so subsequent calls are
2457
 
                # not affected.
2458
 
                socket.socket = self.socket_socket
2459
 
                del self.socket_socket
2460
 
                # This time only, return a new socket object from the
2461
 
                # saved file descriptor.
2462
 
                return socket.fromfd(self.socketfd, *args, **kwargs)
2463
 
            # Replace socket.socket() function with wrapper
2464
 
            socket.socket = socket_wrapper
2465
 
        # The socketserver.TCPServer.__init__ will call
2466
 
        # socket.socket(), which might be our replacement,
2467
 
        # socket_wrapper(), if socketfd was set.
2468
 
        socketserver.TCPServer.__init__(self, server_address,
2469
 
                                        RequestHandlerClass)
2470
 
 
 
741
    address_family = socket.AF_INET6
 
742
    def __init__(self, *args, **kwargs):
 
743
        if "settings" in kwargs:
 
744
            self.settings = kwargs["settings"]
 
745
            del kwargs["settings"]
 
746
        if "clients" in kwargs:
 
747
            self.clients = kwargs["clients"]
 
748
            del kwargs["clients"]
 
749
        self.enabled = False
 
750
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
2471
751
    def server_bind(self):
2472
752
        """This overrides the normal server_bind() function
2473
753
        to bind to an interface if one was specified, and also NOT to
2474
754
        bind to an address or port if they were not specified."""
2475
 
        global SO_BINDTODEVICE
2476
 
        if self.interface is not None:
2477
 
            if SO_BINDTODEVICE is None:
2478
 
                # Fall back to a hard-coded value which seems to be
2479
 
                # common enough.
2480
 
                logger.warning("SO_BINDTODEVICE not found, trying 25")
2481
 
                SO_BINDTODEVICE = 25
 
755
        if self.settings["interface"]:
 
756
            # 25 is from /usr/include/asm-i486/socket.h
 
757
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
2482
758
            try:
2483
 
                self.socket.setsockopt(
2484
 
                    socket.SOL_SOCKET, SO_BINDTODEVICE,
2485
 
                    (self.interface + "\0").encode("utf-8"))
2486
 
            except socket.error as error:
2487
 
                if error.errno == errno.EPERM:
2488
 
                    logger.error("No permission to bind to"
2489
 
                                 " interface %s", self.interface)
2490
 
                elif error.errno == errno.ENOPROTOOPT:
2491
 
                    logger.error("SO_BINDTODEVICE not available;"
2492
 
                                 " cannot bind to interface %s",
2493
 
                                 self.interface)
2494
 
                elif error.errno == errno.ENODEV:
2495
 
                    logger.error("Interface %s does not exist,"
2496
 
                                 " cannot bind", self.interface)
 
759
                self.socket.setsockopt(socket.SOL_SOCKET,
 
760
                                       SO_BINDTODEVICE,
 
761
                                       self.settings["interface"])
 
762
            except socket.error, error:
 
763
                if error[0] == errno.EPERM:
 
764
                    logger.error(u"No permission to"
 
765
                                 u" bind to interface %s",
 
766
                                 self.settings["interface"])
2497
767
                else:
2498
768
                    raise
2499
769
        # Only bind(2) the socket if we really need to.
2500
770
        if self.server_address[0] or self.server_address[1]:
2501
771
            if not self.server_address[0]:
2502
 
                if self.address_family == socket.AF_INET6:
2503
 
                    any_address = "::"  # in6addr_any
2504
 
                else:
2505
 
                    any_address = "0.0.0.0"  # INADDR_ANY
2506
 
                self.server_address = (any_address,
 
772
                in6addr_any = "::"
 
773
                self.server_address = (in6addr_any,
2507
774
                                       self.server_address[1])
2508
775
            elif not self.server_address[1]:
2509
 
                self.server_address = (self.server_address[0], 0)
2510
 
#                 if self.interface:
 
776
                self.server_address = (self.server_address[0],
 
777
                                       0)
 
778
#                 if self.settings["interface"]:
2511
779
#                     self.server_address = (self.server_address[0],
2512
780
#                                            0, # port
2513
781
#                                            0, # flowinfo
2514
782
#                                            if_nametoindex
2515
 
#                                            (self.interface))
2516
 
            return socketserver.TCPServer.server_bind(self)
2517
 
 
2518
 
 
2519
 
class MandosServer(IPv6_TCPServer):
2520
 
    """Mandos server.
2521
 
 
2522
 
    Attributes:
2523
 
        clients:        set of Client objects
2524
 
        gnutls_priority GnuTLS priority string
2525
 
        use_dbus:       Boolean; to emit D-Bus signals or not
2526
 
 
2527
 
    Assumes a GLib.MainLoop event loop.
2528
 
    """
2529
 
 
2530
 
    def __init__(self, server_address, RequestHandlerClass,
2531
 
                 interface=None,
2532
 
                 use_ipv6=True,
2533
 
                 clients=None,
2534
 
                 gnutls_priority=None,
2535
 
                 use_dbus=True,
2536
 
                 socketfd=None):
2537
 
        self.enabled = False
2538
 
        self.clients = clients
2539
 
        if self.clients is None:
2540
 
            self.clients = {}
2541
 
        self.use_dbus = use_dbus
2542
 
        self.gnutls_priority = gnutls_priority
2543
 
        IPv6_TCPServer.__init__(self, server_address,
2544
 
                                RequestHandlerClass,
2545
 
                                interface=interface,
2546
 
                                use_ipv6=use_ipv6,
2547
 
                                socketfd=socketfd)
2548
 
 
 
783
#                                            (self.settings
 
784
#                                             ["interface"]))
 
785
            return super(IPv6_TCPServer, self).server_bind()
2549
786
    def server_activate(self):
2550
787
        if self.enabled:
2551
 
            return socketserver.TCPServer.server_activate(self)
2552
 
 
 
788
            return super(IPv6_TCPServer, self).server_activate()
2553
789
    def enable(self):
2554
790
        self.enabled = True
2555
791
 
2556
 
    def add_pipe(self, parent_pipe, proc):
2557
 
        # Call "handle_ipc" for both data and EOF events
2558
 
        GLib.io_add_watch(
2559
 
            parent_pipe.fileno(),
2560
 
            GLib.IO_IN | GLib.IO_HUP,
2561
 
            functools.partial(self.handle_ipc,
2562
 
                              parent_pipe=parent_pipe,
2563
 
                              proc=proc))
2564
 
 
2565
 
    def handle_ipc(self, source, condition,
2566
 
                   parent_pipe=None,
2567
 
                   proc=None,
2568
 
                   client_object=None):
2569
 
        # error, or the other end of multiprocessing.Pipe has closed
2570
 
        if condition & (GLib.IO_ERR | GLib.IO_HUP):
2571
 
            # Wait for other process to exit
2572
 
            proc.join()
2573
 
            return False
2574
 
 
2575
 
        # Read a request from the child
2576
 
        request = parent_pipe.recv()
2577
 
        command = request[0]
2578
 
 
2579
 
        if command == 'init':
2580
 
            fpr = request[1]
2581
 
            address = request[2]
2582
 
 
2583
 
            for c in self.clients.values():
2584
 
                if c.fingerprint == fpr:
2585
 
                    client = c
2586
 
                    break
2587
 
            else:
2588
 
                logger.info("Client not found for fingerprint: %s, ad"
2589
 
                            "dress: %s", fpr, address)
2590
 
                if self.use_dbus:
2591
 
                    # Emit D-Bus signal
2592
 
                    mandos_dbus_service.ClientNotFound(fpr,
2593
 
                                                       address[0])
2594
 
                parent_pipe.send(False)
2595
 
                return False
2596
 
 
2597
 
            GLib.io_add_watch(
2598
 
                parent_pipe.fileno(),
2599
 
                GLib.IO_IN | GLib.IO_HUP,
2600
 
                functools.partial(self.handle_ipc,
2601
 
                                  parent_pipe=parent_pipe,
2602
 
                                  proc=proc,
2603
 
                                  client_object=client))
2604
 
            parent_pipe.send(True)
2605
 
            # remove the old hook in favor of the new above hook on
2606
 
            # same fileno
2607
 
            return False
2608
 
        if command == 'funcall':
2609
 
            funcname = request[1]
2610
 
            args = request[2]
2611
 
            kwargs = request[3]
2612
 
 
2613
 
            parent_pipe.send(('data', getattr(client_object,
2614
 
                                              funcname)(*args,
2615
 
                                                        **kwargs)))
2616
 
 
2617
 
        if command == 'getattr':
2618
 
            attrname = request[1]
2619
 
            if isinstance(client_object.__getattribute__(attrname),
2620
 
                          collections.Callable):
2621
 
                parent_pipe.send(('function', ))
2622
 
            else:
2623
 
                parent_pipe.send((
2624
 
                    'data', client_object.__getattribute__(attrname)))
2625
 
 
2626
 
        if command == 'setattr':
2627
 
            attrname = request[1]
2628
 
            value = request[2]
2629
 
            setattr(client_object, attrname, value)
2630
 
 
2631
 
        return True
2632
 
 
2633
 
 
2634
 
def rfc3339_duration_to_delta(duration):
2635
 
    """Parse an RFC 3339 "duration" and return a datetime.timedelta
2636
 
 
2637
 
    >>> rfc3339_duration_to_delta("P7D")
2638
 
    datetime.timedelta(7)
2639
 
    >>> rfc3339_duration_to_delta("PT60S")
2640
 
    datetime.timedelta(0, 60)
2641
 
    >>> rfc3339_duration_to_delta("PT60M")
2642
 
    datetime.timedelta(0, 3600)
2643
 
    >>> rfc3339_duration_to_delta("PT24H")
2644
 
    datetime.timedelta(1)
2645
 
    >>> rfc3339_duration_to_delta("P1W")
2646
 
    datetime.timedelta(7)
2647
 
    >>> rfc3339_duration_to_delta("PT5M30S")
2648
 
    datetime.timedelta(0, 330)
2649
 
    >>> rfc3339_duration_to_delta("P1DT3M20S")
2650
 
    datetime.timedelta(1, 200)
2651
 
    """
2652
 
 
2653
 
    # Parsing an RFC 3339 duration with regular expressions is not
2654
 
    # possible - there would have to be multiple places for the same
2655
 
    # values, like seconds.  The current code, while more esoteric, is
2656
 
    # cleaner without depending on a parsing library.  If Python had a
2657
 
    # built-in library for parsing we would use it, but we'd like to
2658
 
    # avoid excessive use of external libraries.
2659
 
 
2660
 
    # New type for defining tokens, syntax, and semantics all-in-one
2661
 
    Token = collections.namedtuple("Token", (
2662
 
        "regexp",  # To match token; if "value" is not None, must have
2663
 
                   # a "group" containing digits
2664
 
        "value",   # datetime.timedelta or None
2665
 
        "followers"))           # Tokens valid after this token
2666
 
    # RFC 3339 "duration" tokens, syntax, and semantics; taken from
2667
 
    # the "duration" ABNF definition in RFC 3339, Appendix A.
2668
 
    token_end = Token(re.compile(r"$"), None, frozenset())
2669
 
    token_second = Token(re.compile(r"(\d+)S"),
2670
 
                         datetime.timedelta(seconds=1),
2671
 
                         frozenset((token_end, )))
2672
 
    token_minute = Token(re.compile(r"(\d+)M"),
2673
 
                         datetime.timedelta(minutes=1),
2674
 
                         frozenset((token_second, token_end)))
2675
 
    token_hour = Token(re.compile(r"(\d+)H"),
2676
 
                       datetime.timedelta(hours=1),
2677
 
                       frozenset((token_minute, token_end)))
2678
 
    token_time = Token(re.compile(r"T"),
2679
 
                       None,
2680
 
                       frozenset((token_hour, token_minute,
2681
 
                                  token_second)))
2682
 
    token_day = Token(re.compile(r"(\d+)D"),
2683
 
                      datetime.timedelta(days=1),
2684
 
                      frozenset((token_time, token_end)))
2685
 
    token_month = Token(re.compile(r"(\d+)M"),
2686
 
                        datetime.timedelta(weeks=4),
2687
 
                        frozenset((token_day, token_end)))
2688
 
    token_year = Token(re.compile(r"(\d+)Y"),
2689
 
                       datetime.timedelta(weeks=52),
2690
 
                       frozenset((token_month, token_end)))
2691
 
    token_week = Token(re.compile(r"(\d+)W"),
2692
 
                       datetime.timedelta(weeks=1),
2693
 
                       frozenset((token_end, )))
2694
 
    token_duration = Token(re.compile(r"P"), None,
2695
 
                           frozenset((token_year, token_month,
2696
 
                                      token_day, token_time,
2697
 
                                      token_week)))
2698
 
    # Define starting values:
2699
 
    # Value so far
2700
 
    value = datetime.timedelta()
2701
 
    found_token = None
2702
 
    # Following valid tokens
2703
 
    followers = frozenset((token_duration, ))
2704
 
    # String left to parse
2705
 
    s = duration
2706
 
    # Loop until end token is found
2707
 
    while found_token is not token_end:
2708
 
        # Search for any currently valid tokens
2709
 
        for token in followers:
2710
 
            match = token.regexp.match(s)
2711
 
            if match is not None:
2712
 
                # Token found
2713
 
                if token.value is not None:
2714
 
                    # Value found, parse digits
2715
 
                    factor = int(match.group(1), 10)
2716
 
                    # Add to value so far
2717
 
                    value += factor * token.value
2718
 
                # Strip token from string
2719
 
                s = token.regexp.sub("", s, 1)
2720
 
                # Go to found token
2721
 
                found_token = token
2722
 
                # Set valid next tokens
2723
 
                followers = found_token.followers
2724
 
                break
2725
 
        else:
2726
 
            # No currently valid tokens were found
2727
 
            raise ValueError("Invalid RFC 3339 duration: {!r}"
2728
 
                             .format(duration))
2729
 
    # End token found
2730
 
    return value
2731
 
 
2732
792
 
2733
793
def string_to_delta(interval):
2734
794
    """Parse a string and return a datetime.timedelta
2735
 
 
 
795
    
2736
796
    >>> string_to_delta('7d')
2737
797
    datetime.timedelta(7)
2738
798
    >>> string_to_delta('60s')
2741
801
    datetime.timedelta(0, 3600)
2742
802
    >>> string_to_delta('24h')
2743
803
    datetime.timedelta(1)
2744
 
    >>> string_to_delta('1w')
 
804
    >>> string_to_delta(u'1w')
2745
805
    datetime.timedelta(7)
2746
806
    >>> string_to_delta('5m 30s')
2747
807
    datetime.timedelta(0, 330)
2748
808
    """
2749
 
 
2750
 
    try:
2751
 
        return rfc3339_duration_to_delta(interval)
2752
 
    except ValueError:
2753
 
        pass
2754
 
 
2755
809
    timevalue = datetime.timedelta(0)
2756
810
    for s in interval.split():
2757
811
        try:
2758
 
            suffix = s[-1]
 
812
            suffix = unicode(s[-1])
2759
813
            value = int(s[:-1])
2760
 
            if suffix == "d":
 
814
            if suffix == u"d":
2761
815
                delta = datetime.timedelta(value)
2762
 
            elif suffix == "s":
 
816
            elif suffix == u"s":
2763
817
                delta = datetime.timedelta(0, value)
2764
 
            elif suffix == "m":
 
818
            elif suffix == u"m":
2765
819
                delta = datetime.timedelta(0, 0, 0, 0, value)
2766
 
            elif suffix == "h":
 
820
            elif suffix == u"h":
2767
821
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
2768
 
            elif suffix == "w":
 
822
            elif suffix == u"w":
2769
823
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
2770
824
            else:
2771
 
                raise ValueError("Unknown suffix {!r}".format(suffix))
2772
 
        except IndexError as e:
2773
 
            raise ValueError(*(e.args))
 
825
                raise ValueError
 
826
        except (ValueError, IndexError):
 
827
            raise ValueError
2774
828
        timevalue += delta
2775
829
    return timevalue
2776
830
 
2777
831
 
2778
 
def daemon(nochdir=False, noclose=False):
 
832
def server_state_changed(state):
 
833
    """Derived from the Avahi example code"""
 
834
    if state == avahi.SERVER_COLLISION:
 
835
        logger.error(u"Zeroconf server name collision")
 
836
        service.remove()
 
837
    elif state == avahi.SERVER_RUNNING:
 
838
        service.add()
 
839
 
 
840
 
 
841
def entry_group_state_changed(state, error):
 
842
    """Derived from the Avahi example code"""
 
843
    logger.debug(u"Avahi state change: %i", state)
 
844
    
 
845
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
846
        logger.debug(u"Zeroconf service established.")
 
847
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
848
        logger.warning(u"Zeroconf service name collision.")
 
849
        service.rename()
 
850
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
851
        logger.critical(u"Avahi: Error in group state changed %s",
 
852
                        unicode(error))
 
853
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
 
854
 
 
855
def if_nametoindex(interface):
 
856
    """Call the C function if_nametoindex(), or equivalent"""
 
857
    global if_nametoindex
 
858
    try:
 
859
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
860
                          (ctypes.util.find_library("c"))
 
861
                          .if_nametoindex)
 
862
    except (OSError, AttributeError):
 
863
        if "struct" not in sys.modules:
 
864
            import struct
 
865
        if "fcntl" not in sys.modules:
 
866
            import fcntl
 
867
        def if_nametoindex(interface):
 
868
            "Get an interface index the hard way, i.e. using fcntl()"
 
869
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
870
            with closing(socket.socket()) as s:
 
871
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
872
                                    struct.pack("16s16x", interface))
 
873
            interface_index = struct.unpack("I", ifreq[16:20])[0]
 
874
            return interface_index
 
875
    return if_nametoindex(interface)
 
876
 
 
877
 
 
878
def daemon(nochdir = False, noclose = False):
2779
879
    """See daemon(3).  Standard BSD Unix function.
2780
 
 
2781
880
    This should really exist as os.daemon, but it doesn't (yet)."""
2782
881
    if os.fork():
2783
882
        sys.exit()
2788
887
        sys.exit()
2789
888
    if not noclose:
2790
889
        # Close all standard open file descriptors
2791
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
 
890
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
2792
891
        if not stat.S_ISCHR(os.fstat(null).st_mode):
2793
892
            raise OSError(errno.ENODEV,
2794
 
                          "{} not a character device"
2795
 
                          .format(os.devnull))
 
893
                          "/dev/null not a character device")
2796
894
        os.dup2(null, sys.stdin.fileno())
2797
895
        os.dup2(null, sys.stdout.fileno())
2798
896
        os.dup2(null, sys.stderr.fileno())
2801
899
 
2802
900
 
2803
901
def main():
2804
 
 
2805
 
    ##################################################################
2806
 
    # Parsing of options, both command line and config file
2807
 
 
2808
 
    parser = argparse.ArgumentParser()
2809
 
    parser.add_argument("-v", "--version", action="version",
2810
 
                        version="%(prog)s {}".format(version),
2811
 
                        help="show version number and exit")
2812
 
    parser.add_argument("-i", "--interface", metavar="IF",
2813
 
                        help="Bind to interface IF")
2814
 
    parser.add_argument("-a", "--address",
2815
 
                        help="Address to listen for requests on")
2816
 
    parser.add_argument("-p", "--port", type=int,
2817
 
                        help="Port number to receive requests on")
2818
 
    parser.add_argument("--check", action="store_true",
2819
 
                        help="Run self-test")
2820
 
    parser.add_argument("--debug", action="store_true",
2821
 
                        help="Debug mode; run in foreground and log"
2822
 
                        " to terminal", default=None)
2823
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
2824
 
                        help="Debug level for stdout output")
2825
 
    parser.add_argument("--priority", help="GnuTLS"
2826
 
                        " priority string (see GnuTLS documentation)")
2827
 
    parser.add_argument("--servicename",
2828
 
                        metavar="NAME", help="Zeroconf service name")
2829
 
    parser.add_argument("--configdir",
2830
 
                        default="/etc/mandos", metavar="DIR",
2831
 
                        help="Directory to search for configuration"
2832
 
                        " files")
2833
 
    parser.add_argument("--no-dbus", action="store_false",
2834
 
                        dest="use_dbus", help="Do not provide D-Bus"
2835
 
                        " system bus interface", default=None)
2836
 
    parser.add_argument("--no-ipv6", action="store_false",
2837
 
                        dest="use_ipv6", help="Do not use IPv6",
2838
 
                        default=None)
2839
 
    parser.add_argument("--no-restore", action="store_false",
2840
 
                        dest="restore", help="Do not restore stored"
2841
 
                        " state", default=None)
2842
 
    parser.add_argument("--socket", type=int,
2843
 
                        help="Specify a file descriptor to a network"
2844
 
                        " socket to use instead of creating one")
2845
 
    parser.add_argument("--statedir", metavar="DIR",
2846
 
                        help="Directory to save/restore state in")
2847
 
    parser.add_argument("--foreground", action="store_true",
2848
 
                        help="Run in foreground", default=None)
2849
 
    parser.add_argument("--no-zeroconf", action="store_false",
2850
 
                        dest="zeroconf", help="Do not use Zeroconf",
2851
 
                        default=None)
2852
 
 
2853
 
    options = parser.parse_args()
2854
 
 
 
902
    parser = optparse.OptionParser(version = "%%prog %s" % version)
 
903
    parser.add_option("-i", "--interface", type="string",
 
904
                      metavar="IF", help="Bind to interface IF")
 
905
    parser.add_option("-a", "--address", type="string",
 
906
                      help="Address to listen for requests on")
 
907
    parser.add_option("-p", "--port", type="int",
 
908
                      help="Port number to receive requests on")
 
909
    parser.add_option("--check", action="store_true",
 
910
                      help="Run self-test")
 
911
    parser.add_option("--debug", action="store_true",
 
912
                      help="Debug mode; run in foreground and log to"
 
913
                      " terminal")
 
914
    parser.add_option("--priority", type="string", help="GnuTLS"
 
915
                      " priority string (see GnuTLS documentation)")
 
916
    parser.add_option("--servicename", type="string", metavar="NAME",
 
917
                      help="Zeroconf service name")
 
918
    parser.add_option("--configdir", type="string",
 
919
                      default="/etc/mandos", metavar="DIR",
 
920
                      help="Directory to search for configuration"
 
921
                      " files")
 
922
    parser.add_option("--no-dbus", action="store_false",
 
923
                      dest="use_dbus",
 
924
                      help="Do not provide D-Bus system bus"
 
925
                      " interface")
 
926
    options = parser.parse_args()[0]
 
927
    
2855
928
    if options.check:
2856
929
        import doctest
2857
 
        fail_count, test_count = doctest.testmod()
2858
 
        sys.exit(os.EX_OK if fail_count == 0 else 1)
2859
 
 
 
930
        doctest.testmod()
 
931
        sys.exit()
 
932
    
2860
933
    # Default values for config file for server-global settings
2861
 
    server_defaults = {"interface": "",
2862
 
                       "address": "",
2863
 
                       "port": "",
2864
 
                       "debug": "False",
2865
 
                       "priority":
2866
 
                       "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"
2867
 
                       ":+SIGN-DSA-SHA256",
2868
 
                       "servicename": "Mandos",
2869
 
                       "use_dbus": "True",
2870
 
                       "use_ipv6": "True",
2871
 
                       "debuglevel": "",
2872
 
                       "restore": "True",
2873
 
                       "socket": "",
2874
 
                       "statedir": "/var/lib/mandos",
2875
 
                       "foreground": "False",
2876
 
                       "zeroconf": "True",
2877
 
                       }
2878
 
 
 
934
    server_defaults = { "interface": "",
 
935
                        "address": "",
 
936
                        "port": "",
 
937
                        "debug": "False",
 
938
                        "priority":
 
939
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
940
                        "servicename": "Mandos",
 
941
                        "use_dbus": "True",
 
942
                        }
 
943
    
2879
944
    # Parse config file for server-global settings
2880
 
    server_config = configparser.SafeConfigParser(server_defaults)
 
945
    server_config = ConfigParser.SafeConfigParser(server_defaults)
2881
946
    del server_defaults
2882
947
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
2883
948
    # Convert the SafeConfigParser object to a dict
2884
949
    server_settings = server_config.defaults()
2885
950
    # Use the appropriate methods on the non-string config options
2886
 
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
2887
 
                   "foreground", "zeroconf"):
2888
 
        server_settings[option] = server_config.getboolean("DEFAULT",
2889
 
                                                           option)
 
951
    server_settings["debug"] = server_config.getboolean("DEFAULT",
 
952
                                                        "debug")
 
953
    server_settings["use_dbus"] = server_config.getboolean("DEFAULT",
 
954
                                                           "use_dbus")
2890
955
    if server_settings["port"]:
2891
956
        server_settings["port"] = server_config.getint("DEFAULT",
2892
957
                                                       "port")
2893
 
    if server_settings["socket"]:
2894
 
        server_settings["socket"] = server_config.getint("DEFAULT",
2895
 
                                                         "socket")
2896
 
        # Later, stdin will, and stdout and stderr might, be dup'ed
2897
 
        # over with an opened os.devnull.  But we don't want this to
2898
 
        # happen with a supplied network socket.
2899
 
        if 0 <= server_settings["socket"] <= 2:
2900
 
            server_settings["socket"] = os.dup(server_settings
2901
 
                                               ["socket"])
2902
958
    del server_config
2903
 
 
 
959
    
2904
960
    # Override the settings from the config file with command line
2905
961
    # options, if set.
2906
962
    for option in ("interface", "address", "port", "debug",
2907
 
                   "priority", "servicename", "configdir", "use_dbus",
2908
 
                   "use_ipv6", "debuglevel", "restore", "statedir",
2909
 
                   "socket", "foreground", "zeroconf"):
 
963
                   "priority", "servicename", "configdir",
 
964
                   "use_dbus"):
2910
965
        value = getattr(options, option)
2911
966
        if value is not None:
2912
967
            server_settings[option] = value
2913
968
    del options
2914
 
    # Force all strings to be unicode
2915
 
    for option in server_settings.keys():
2916
 
        if isinstance(server_settings[option], bytes):
2917
 
            server_settings[option] = (server_settings[option]
2918
 
                                       .decode("utf-8"))
2919
 
    # Force all boolean options to be boolean
2920
 
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
2921
 
                   "foreground", "zeroconf"):
2922
 
        server_settings[option] = bool(server_settings[option])
2923
 
    # Debug implies foreground
2924
 
    if server_settings["debug"]:
2925
 
        server_settings["foreground"] = True
2926
969
    # Now we have our good server settings in "server_settings"
2927
 
 
2928
 
    ##################################################################
2929
 
 
2930
 
    if (not server_settings["zeroconf"]
2931
 
        and not (server_settings["port"]
2932
 
                 or server_settings["socket"] != "")):
2933
 
        parser.error("Needs port or socket to work without Zeroconf")
2934
 
 
 
970
    
2935
971
    # For convenience
2936
972
    debug = server_settings["debug"]
2937
 
    debuglevel = server_settings["debuglevel"]
2938
973
    use_dbus = server_settings["use_dbus"]
2939
 
    use_ipv6 = server_settings["use_ipv6"]
2940
 
    stored_state_path = os.path.join(server_settings["statedir"],
2941
 
                                     stored_state_file)
2942
 
    foreground = server_settings["foreground"]
2943
 
    zeroconf = server_settings["zeroconf"]
2944
 
 
2945
 
    if debug:
2946
 
        initlogger(debug, logging.DEBUG)
2947
 
    else:
2948
 
        if not debuglevel:
2949
 
            initlogger(debug)
2950
 
        else:
2951
 
            level = getattr(logging, debuglevel.upper())
2952
 
            initlogger(debug, level)
2953
 
 
 
974
    
 
975
    if not debug:
 
976
        syslogger.setLevel(logging.WARNING)
 
977
        console.setLevel(logging.WARNING)
 
978
    
2954
979
    if server_settings["servicename"] != "Mandos":
2955
 
        syslogger.setFormatter(
2956
 
            logging.Formatter('Mandos ({}) [%(process)d]:'
2957
 
                              ' %(levelname)s: %(message)s'.format(
2958
 
                                  server_settings["servicename"])))
2959
 
 
 
980
        syslogger.setFormatter(logging.Formatter
 
981
                               ('Mandos (%s): %%(levelname)s:'
 
982
                                ' %%(message)s'
 
983
                                % server_settings["servicename"]))
 
984
    
2960
985
    # Parse config file with clients
2961
 
    client_config = configparser.SafeConfigParser(Client
2962
 
                                                  .client_defaults)
 
986
    client_defaults = { "timeout": "1h",
 
987
                        "interval": "5m",
 
988
                        "checker": "fping -q -- %%(host)s",
 
989
                        "host": "",
 
990
                        }
 
991
    client_config = ConfigParser.SafeConfigParser(client_defaults)
2963
992
    client_config.read(os.path.join(server_settings["configdir"],
2964
993
                                    "clients.conf"))
2965
 
 
2966
 
    global mandos_dbus_service
2967
 
    mandos_dbus_service = None
2968
 
 
2969
 
    socketfd = None
2970
 
    if server_settings["socket"] != "":
2971
 
        socketfd = server_settings["socket"]
2972
 
    tcp_server = MandosServer(
2973
 
        (server_settings["address"], server_settings["port"]),
2974
 
        ClientHandler,
2975
 
        interface=(server_settings["interface"] or None),
2976
 
        use_ipv6=use_ipv6,
2977
 
        gnutls_priority=server_settings["priority"],
2978
 
        use_dbus=use_dbus,
2979
 
        socketfd=socketfd)
2980
 
    if not foreground:
2981
 
        pidfilename = "/run/mandos.pid"
2982
 
        if not os.path.isdir("/run/."):
2983
 
            pidfilename = "/var/run/mandos.pid"
2984
 
        pidfile = None
2985
 
        try:
2986
 
            pidfile = codecs.open(pidfilename, "w", encoding="utf-8")
2987
 
        except IOError as e:
2988
 
            logger.error("Could not open file %r", pidfilename,
2989
 
                         exc_info=e)
2990
 
 
2991
 
    for name, group in (("_mandos", "_mandos"),
2992
 
                        ("mandos", "mandos"),
2993
 
                        ("nobody", "nogroup")):
2994
 
        try:
2995
 
            uid = pwd.getpwnam(name).pw_uid
2996
 
            gid = pwd.getpwnam(group).pw_gid
2997
 
            break
 
994
    
 
995
    clients = Set()
 
996
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
997
                                 server_settings["port"]),
 
998
                                TCP_handler,
 
999
                                settings=server_settings,
 
1000
                                clients=clients)
 
1001
    pidfilename = "/var/run/mandos.pid"
 
1002
    try:
 
1003
        pidfile = open(pidfilename, "w")
 
1004
    except IOError:
 
1005
        logger.error("Could not open file %r", pidfilename)
 
1006
    
 
1007
    try:
 
1008
        uid = pwd.getpwnam("_mandos").pw_uid
 
1009
        gid = pwd.getpwnam("_mandos").pw_gid
 
1010
    except KeyError:
 
1011
        try:
 
1012
            uid = pwd.getpwnam("mandos").pw_uid
 
1013
            gid = pwd.getpwnam("mandos").pw_gid
2998
1014
        except KeyError:
2999
 
            continue
3000
 
    else:
3001
 
        uid = 65534
3002
 
        gid = 65534
 
1015
            try:
 
1016
                uid = pwd.getpwnam("nobody").pw_uid
 
1017
                gid = pwd.getpwnam("nogroup").pw_gid
 
1018
            except KeyError:
 
1019
                uid = 65534
 
1020
                gid = 65534
3003
1021
    try:
3004
1022
        os.setgid(gid)
3005
1023
        os.setuid(uid)
3006
 
        if debug:
3007
 
            logger.debug("Did setuid/setgid to {}:{}".format(uid,
3008
 
                                                             gid))
3009
 
    except OSError as error:
3010
 
        logger.warning("Failed to setuid/setgid to {}:{}: {}"
3011
 
                       .format(uid, gid, os.strerror(error.errno)))
3012
 
        if error.errno != errno.EPERM:
3013
 
            raise
3014
 
 
 
1024
    except OSError, error:
 
1025
        if error[0] != errno.EPERM:
 
1026
            raise error
 
1027
    
 
1028
    # Enable all possible GnuTLS debugging
3015
1029
    if debug:
3016
 
        # Enable all possible GnuTLS debugging
3017
 
 
3018
1030
        # "Use a log level over 10 to enable all debugging options."
3019
1031
        # - GnuTLS manual
3020
 
        gnutls.global_set_log_level(11)
3021
 
 
3022
 
        @gnutls.log_func
 
1032
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1033
        
 
1034
        @gnutls.library.types.gnutls_log_func
3023
1035
        def debug_gnutls(level, string):
3024
1036
            logger.debug("GnuTLS: %s", string[:-1])
3025
 
 
3026
 
        gnutls.global_set_log_function(debug_gnutls)
3027
 
 
3028
 
        # Redirect stdin so all checkers get /dev/null
3029
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
3030
 
        os.dup2(null, sys.stdin.fileno())
3031
 
        if null > 2:
3032
 
            os.close(null)
3033
 
 
3034
 
    # Need to fork before connecting to D-Bus
3035
 
    if not foreground:
3036
 
        # Close all input and output, do double fork, etc.
3037
 
        daemon()
3038
 
 
3039
 
    # multiprocessing will use threads, so before we use GLib we need
3040
 
    # to inform GLib that threads will be used.
3041
 
    GLib.threads_init()
3042
 
 
 
1037
        
 
1038
        (gnutls.library.functions
 
1039
         .gnutls_global_set_log_function(debug_gnutls))
 
1040
    
 
1041
    global service
 
1042
    service = AvahiService(name = server_settings["servicename"],
 
1043
                           servicetype = "_mandos._tcp", )
 
1044
    if server_settings["interface"]:
 
1045
        service.interface = (if_nametoindex
 
1046
                             (server_settings["interface"]))
 
1047
    
3043
1048
    global main_loop
 
1049
    global bus
 
1050
    global server
3044
1051
    # From the Avahi example code
3045
 
    DBusGMainLoop(set_as_default=True)
3046
 
    main_loop = GLib.MainLoop()
 
1052
    DBusGMainLoop(set_as_default=True )
 
1053
    main_loop = gobject.MainLoop()
3047
1054
    bus = dbus.SystemBus()
 
1055
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
 
1056
                                           avahi.DBUS_PATH_SERVER),
 
1057
                            avahi.DBUS_INTERFACE_SERVER)
3048
1058
    # End of Avahi example code
3049
1059
    if use_dbus:
3050
 
        try:
3051
 
            bus_name = dbus.service.BusName("se.recompile.Mandos",
3052
 
                                            bus,
3053
 
                                            do_not_queue=True)
3054
 
            old_bus_name = dbus.service.BusName(
3055
 
                "se.bsnet.fukt.Mandos", bus,
3056
 
                do_not_queue=True)
3057
 
        except dbus.exceptions.DBusException as e:
3058
 
            logger.error("Disabling D-Bus:", exc_info=e)
3059
 
            use_dbus = False
3060
 
            server_settings["use_dbus"] = False
3061
 
            tcp_server.use_dbus = False
3062
 
    if zeroconf:
3063
 
        protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
3064
 
        service = AvahiServiceToSyslog(
3065
 
            name=server_settings["servicename"],
3066
 
            servicetype="_mandos._tcp",
3067
 
            protocol=protocol,
3068
 
            bus=bus)
3069
 
        if server_settings["interface"]:
3070
 
            service.interface = if_nametoindex(
3071
 
                server_settings["interface"].encode("utf-8"))
3072
 
 
3073
 
    global multiprocessing_manager
3074
 
    multiprocessing_manager = multiprocessing.Manager()
3075
 
 
3076
 
    client_class = Client
3077
 
    if use_dbus:
3078
 
        client_class = functools.partial(ClientDBus, bus=bus)
3079
 
 
3080
 
    client_settings = Client.config_parser(client_config)
3081
 
    old_client_settings = {}
3082
 
    clients_data = {}
3083
 
 
3084
 
    # This is used to redirect stdout and stderr for checker processes
3085
 
    global wnull
3086
 
    wnull = open(os.devnull, "w")  # A writable /dev/null
3087
 
    # Only used if server is running in foreground but not in debug
3088
 
    # mode
3089
 
    if debug or not foreground:
3090
 
        wnull.close()
3091
 
 
3092
 
    # Get client data and settings from last running state.
3093
 
    if server_settings["restore"]:
3094
 
        try:
3095
 
            with open(stored_state_path, "rb") as stored_state:
3096
 
                if sys.version_info.major == 2:
3097
 
                    clients_data, old_client_settings = pickle.load(
3098
 
                        stored_state)
3099
 
                else:
3100
 
                    bytes_clients_data, bytes_old_client_settings = (
3101
 
                        pickle.load(stored_state, encoding="bytes"))
3102
 
                    #   Fix bytes to strings
3103
 
                    #  clients_data
3104
 
                    # .keys()
3105
 
                    clients_data = {(key.decode("utf-8")
3106
 
                                     if isinstance(key, bytes)
3107
 
                                     else key): value
3108
 
                                    for key, value in
3109
 
                                    bytes_clients_data.items()}
3110
 
                    del bytes_clients_data
3111
 
                    for key in clients_data:
3112
 
                        value = {(k.decode("utf-8")
3113
 
                                  if isinstance(k, bytes) else k): v
3114
 
                                 for k, v in
3115
 
                                 clients_data[key].items()}
3116
 
                        clients_data[key] = value
3117
 
                        # .client_structure
3118
 
                        value["client_structure"] = [
3119
 
                            (s.decode("utf-8")
3120
 
                             if isinstance(s, bytes)
3121
 
                             else s) for s in
3122
 
                            value["client_structure"]]
3123
 
                        # .name & .host
3124
 
                        for k in ("name", "host"):
3125
 
                            if isinstance(value[k], bytes):
3126
 
                                value[k] = value[k].decode("utf-8")
3127
 
                    #  old_client_settings
3128
 
                    # .keys()
3129
 
                    old_client_settings = {
3130
 
                        (key.decode("utf-8")
3131
 
                         if isinstance(key, bytes)
3132
 
                         else key): value
3133
 
                        for key, value in
3134
 
                        bytes_old_client_settings.items()}
3135
 
                    del bytes_old_client_settings
3136
 
                    # .host
3137
 
                    for value in old_client_settings.values():
3138
 
                        if isinstance(value["host"], bytes):
3139
 
                            value["host"] = (value["host"]
3140
 
                                             .decode("utf-8"))
3141
 
            os.remove(stored_state_path)
3142
 
        except IOError as e:
3143
 
            if e.errno == errno.ENOENT:
3144
 
                logger.warning("Could not load persistent state:"
3145
 
                               " {}".format(os.strerror(e.errno)))
3146
 
            else:
3147
 
                logger.critical("Could not load persistent state:",
3148
 
                                exc_info=e)
3149
 
                raise
3150
 
        except EOFError as e:
3151
 
            logger.warning("Could not load persistent state: "
3152
 
                           "EOFError:",
3153
 
                           exc_info=e)
3154
 
 
3155
 
    with PGPEngine() as pgp:
3156
 
        for client_name, client in clients_data.items():
3157
 
            # Skip removed clients
3158
 
            if client_name not in client_settings:
3159
 
                continue
3160
 
 
3161
 
            # Decide which value to use after restoring saved state.
3162
 
            # We have three different values: Old config file,
3163
 
            # new config file, and saved state.
3164
 
            # New config value takes precedence if it differs from old
3165
 
            # config value, otherwise use saved state.
3166
 
            for name, value in client_settings[client_name].items():
3167
 
                try:
3168
 
                    # For each value in new config, check if it
3169
 
                    # differs from the old config value (Except for
3170
 
                    # the "secret" attribute)
3171
 
                    if (name != "secret"
3172
 
                        and (value !=
3173
 
                             old_client_settings[client_name][name])):
3174
 
                        client[name] = value
3175
 
                except KeyError:
3176
 
                    pass
3177
 
 
3178
 
            # Clients who has passed its expire date can still be
3179
 
            # enabled if its last checker was successful.  A Client
3180
 
            # whose checker succeeded before we stored its state is
3181
 
            # assumed to have successfully run all checkers during
3182
 
            # downtime.
3183
 
            if client["enabled"]:
3184
 
                if datetime.datetime.utcnow() >= client["expires"]:
3185
 
                    if not client["last_checked_ok"]:
3186
 
                        logger.warning(
3187
 
                            "disabling client {} - Client never "
3188
 
                            "performed a successful checker".format(
3189
 
                                client_name))
3190
 
                        client["enabled"] = False
3191
 
                    elif client["last_checker_status"] != 0:
3192
 
                        logger.warning(
3193
 
                            "disabling client {} - Client last"
3194
 
                            " checker failed with error code"
3195
 
                            " {}".format(
3196
 
                                client_name,
3197
 
                                client["last_checker_status"]))
3198
 
                        client["enabled"] = False
3199
 
                    else:
3200
 
                        client["expires"] = (
3201
 
                            datetime.datetime.utcnow()
3202
 
                            + client["timeout"])
3203
 
                        logger.debug("Last checker succeeded,"
3204
 
                                     " keeping {} enabled".format(
3205
 
                                         client_name))
3206
 
            try:
3207
 
                client["secret"] = pgp.decrypt(
3208
 
                    client["encrypted_secret"],
3209
 
                    client_settings[client_name]["secret"])
3210
 
            except PGPError:
3211
 
                # If decryption fails, we use secret from new settings
3212
 
                logger.debug("Failed to decrypt {} old secret".format(
3213
 
                    client_name))
3214
 
                client["secret"] = (client_settings[client_name]
3215
 
                                    ["secret"])
3216
 
 
3217
 
    # Add/remove clients based on new changes made to config
3218
 
    for client_name in (set(old_client_settings)
3219
 
                        - set(client_settings)):
3220
 
        del clients_data[client_name]
3221
 
    for client_name in (set(client_settings)
3222
 
                        - set(old_client_settings)):
3223
 
        clients_data[client_name] = client_settings[client_name]
3224
 
 
3225
 
    # Create all client objects
3226
 
    for client_name, client in clients_data.items():
3227
 
        tcp_server.clients[client_name] = client_class(
3228
 
            name=client_name,
3229
 
            settings=client,
3230
 
            server_settings=server_settings)
3231
 
 
3232
 
    if not tcp_server.clients:
3233
 
        logger.warning("No clients defined")
3234
 
 
3235
 
    if not foreground:
3236
 
        if pidfile is not None:
3237
 
            pid = os.getpid()
3238
 
            try:
3239
 
                with pidfile:
3240
 
                    print(pid, file=pidfile)
3241
 
            except IOError:
3242
 
                logger.error("Could not write to file %r with PID %d",
3243
 
                             pidfilename, pid)
 
1060
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
 
1061
    
 
1062
    clients.update(Set(Client(name = section,
 
1063
                              config
 
1064
                              = dict(client_config.items(section)),
 
1065
                              use_dbus = use_dbus)
 
1066
                       for section in client_config.sections()))
 
1067
    if not clients:
 
1068
        logger.warning(u"No clients defined")
 
1069
    
 
1070
    if debug:
 
1071
        # Redirect stdin so all checkers get /dev/null
 
1072
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1073
        os.dup2(null, sys.stdin.fileno())
 
1074
        if null > 2:
 
1075
            os.close(null)
 
1076
    else:
 
1077
        # No console logging
 
1078
        logger.removeHandler(console)
 
1079
        # Close all input and output, do double fork, etc.
 
1080
        daemon()
 
1081
    
 
1082
    try:
 
1083
        pid = os.getpid()
 
1084
        pidfile.write(str(pid) + "\n")
 
1085
        pidfile.close()
3244
1086
        del pidfile
3245
 
        del pidfilename
3246
 
 
3247
 
    for termsig in (signal.SIGHUP, signal.SIGTERM):
3248
 
        GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,
3249
 
                             lambda: main_loop.quit() and False)
3250
 
 
 
1087
    except IOError:
 
1088
        logger.error(u"Could not write to file %r with PID %d",
 
1089
                     pidfilename, pid)
 
1090
    except NameError:
 
1091
        # "pidfile" was never created
 
1092
        pass
 
1093
    del pidfilename
 
1094
    
 
1095
    def cleanup():
 
1096
        "Cleanup function; run on exit"
 
1097
        global group
 
1098
        # From the Avahi example code
 
1099
        if not group is None:
 
1100
            group.Free()
 
1101
            group = None
 
1102
        # End of Avahi example code
 
1103
        
 
1104
        while clients:
 
1105
            client = clients.pop()
 
1106
            client.disable_hook = None
 
1107
            client.disable()
 
1108
    
 
1109
    atexit.register(cleanup)
 
1110
    
 
1111
    if not debug:
 
1112
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
1113
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
1114
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
1115
    
3251
1116
    if use_dbus:
3252
 
 
3253
 
        @alternate_dbus_interfaces(
3254
 
            {"se.recompile.Mandos": "se.bsnet.fukt.Mandos"})
3255
 
        class MandosDBusService(DBusObjectWithObjectManager):
 
1117
        class MandosServer(dbus.service.Object):
3256
1118
            """A D-Bus proxy object"""
3257
 
 
3258
1119
            def __init__(self):
3259
1120
                dbus.service.Object.__init__(self, bus, "/")
3260
 
 
3261
 
            _interface = "se.recompile.Mandos"
3262
 
 
3263
 
            @dbus.service.signal(_interface, signature="o")
3264
 
            def ClientAdded(self, objpath):
3265
 
                "D-Bus signal"
3266
 
                pass
3267
 
 
3268
 
            @dbus.service.signal(_interface, signature="ss")
3269
 
            def ClientNotFound(self, fingerprint, address):
3270
 
                "D-Bus signal"
3271
 
                pass
3272
 
 
3273
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3274
 
                               "true"})
 
1121
            _interface = u"se.bsnet.fukt.Mandos"
 
1122
            
 
1123
            @dbus.service.signal(_interface, signature="oa{sv}")
 
1124
            def ClientAdded(self, objpath, properties):
 
1125
                "D-Bus signal"
 
1126
                pass
 
1127
            
3275
1128
            @dbus.service.signal(_interface, signature="os")
3276
1129
            def ClientRemoved(self, objpath, name):
3277
1130
                "D-Bus signal"
3278
1131
                pass
3279
 
 
3280
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3281
 
                               "true"})
 
1132
            
3282
1133
            @dbus.service.method(_interface, out_signature="ao")
3283
1134
            def GetAllClients(self):
3284
1135
                "D-Bus method"
3285
 
                return dbus.Array(c.dbus_object_path for c in
3286
 
                                  tcp_server.clients.values())
3287
 
 
3288
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3289
 
                               "true"})
3290
 
            @dbus.service.method(_interface,
3291
 
                                 out_signature="a{oa{sv}}")
 
1136
                return dbus.Array(c.dbus_object_path for c in clients)
 
1137
            
 
1138
            @dbus.service.method(_interface, out_signature="a{oa{sv}}")
3292
1139
            def GetAllClientsWithProperties(self):
3293
1140
                "D-Bus method"
3294
1141
                return dbus.Dictionary(
3295
 
                    {c.dbus_object_path: c.GetAll(
3296
 
                        "se.recompile.Mandos.Client")
3297
 
                     for c in tcp_server.clients.values()},
 
1142
                    ((c.dbus_object_path, c.GetAllProperties())
 
1143
                     for c in clients),
3298
1144
                    signature="oa{sv}")
3299
 
 
 
1145
            
3300
1146
            @dbus.service.method(_interface, in_signature="o")
3301
1147
            def RemoveClient(self, object_path):
3302
1148
                "D-Bus method"
3303
 
                for c in tcp_server.clients.values():
 
1149
                for c in clients:
3304
1150
                    if c.dbus_object_path == object_path:
3305
 
                        del tcp_server.clients[c.name]
3306
 
                        c.remove_from_connection()
3307
 
                        # Don't signal the disabling
3308
 
                        c.disable(quiet=True)
3309
 
                        # Emit D-Bus signal for removal
3310
 
                        self.client_removed_signal(c)
 
1151
                        clients.remove(c)
 
1152
                        # Don't signal anything except ClientRemoved
 
1153
                        c.use_dbus = False
 
1154
                        c.disable()
 
1155
                        # Emit D-Bus signal
 
1156
                        self.ClientRemoved(object_path, c.name)
3311
1157
                        return
3312
 
                raise KeyError(object_path)
3313
 
 
 
1158
                raise KeyError
 
1159
            
3314
1160
            del _interface
3315
 
 
3316
 
            @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
3317
 
                                 out_signature="a{oa{sa{sv}}}")
3318
 
            def GetManagedObjects(self):
3319
 
                """D-Bus method"""
3320
 
                return dbus.Dictionary(
3321
 
                    {client.dbus_object_path:
3322
 
                     dbus.Dictionary(
3323
 
                         {interface: client.GetAll(interface)
3324
 
                          for interface in
3325
 
                          client._get_all_interface_names()})
3326
 
                     for client in tcp_server.clients.values()})
3327
 
 
3328
 
            def client_added_signal(self, client):
3329
 
                """Send the new standard signal and the old signal"""
3330
 
                if use_dbus:
3331
 
                    # New standard signal
3332
 
                    self.InterfacesAdded(
3333
 
                        client.dbus_object_path,
3334
 
                        dbus.Dictionary(
3335
 
                            {interface: client.GetAll(interface)
3336
 
                             for interface in
3337
 
                             client._get_all_interface_names()}))
3338
 
                    # Old signal
3339
 
                    self.ClientAdded(client.dbus_object_path)
3340
 
 
3341
 
            def client_removed_signal(self, client):
3342
 
                """Send the new standard signal and the old signal"""
3343
 
                if use_dbus:
3344
 
                    # New standard signal
3345
 
                    self.InterfacesRemoved(
3346
 
                        client.dbus_object_path,
3347
 
                        client._get_all_interface_names())
3348
 
                    # Old signal
3349
 
                    self.ClientRemoved(client.dbus_object_path,
3350
 
                                       client.name)
3351
 
 
3352
 
        mandos_dbus_service = MandosDBusService()
3353
 
 
3354
 
    # Save modules to variables to exempt the modules from being
3355
 
    # unloaded before the function registered with atexit() is run.
3356
 
    mp = multiprocessing
3357
 
    wn = wnull
3358
 
 
3359
 
    def cleanup():
3360
 
        "Cleanup function; run on exit"
3361
 
        if zeroconf:
3362
 
            service.cleanup()
3363
 
 
3364
 
        mp.active_children()
3365
 
        wn.close()
3366
 
        if not (tcp_server.clients or client_settings):
3367
 
            return
3368
 
 
3369
 
        # Store client before exiting. Secrets are encrypted with key
3370
 
        # based on what config file has. If config file is
3371
 
        # removed/edited, old secret will thus be unrecovable.
3372
 
        clients = {}
3373
 
        with PGPEngine() as pgp:
3374
 
            for client in tcp_server.clients.values():
3375
 
                key = client_settings[client.name]["secret"]
3376
 
                client.encrypted_secret = pgp.encrypt(client.secret,
3377
 
                                                      key)
3378
 
                client_dict = {}
3379
 
 
3380
 
                # A list of attributes that can not be pickled
3381
 
                # + secret.
3382
 
                exclude = {"bus", "changedstate", "secret",
3383
 
                           "checker", "server_settings"}
3384
 
                for name, typ in inspect.getmembers(dbus.service
3385
 
                                                    .Object):
3386
 
                    exclude.add(name)
3387
 
 
3388
 
                client_dict["encrypted_secret"] = (client
3389
 
                                                   .encrypted_secret)
3390
 
                for attr in client.client_structure:
3391
 
                    if attr not in exclude:
3392
 
                        client_dict[attr] = getattr(client, attr)
3393
 
 
3394
 
                clients[client.name] = client_dict
3395
 
                del client_settings[client.name]["secret"]
3396
 
 
3397
 
        try:
3398
 
            with tempfile.NamedTemporaryFile(
3399
 
                    mode='wb',
3400
 
                    suffix=".pickle",
3401
 
                    prefix='clients-',
3402
 
                    dir=os.path.dirname(stored_state_path),
3403
 
                    delete=False) as stored_state:
3404
 
                pickle.dump((clients, client_settings), stored_state,
3405
 
                            protocol=2)
3406
 
                tempname = stored_state.name
3407
 
            os.rename(tempname, stored_state_path)
3408
 
        except (IOError, OSError) as e:
3409
 
            if not debug:
3410
 
                try:
3411
 
                    os.remove(tempname)
3412
 
                except NameError:
3413
 
                    pass
3414
 
            if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
3415
 
                logger.warning("Could not save persistent state: {}"
3416
 
                               .format(os.strerror(e.errno)))
3417
 
            else:
3418
 
                logger.warning("Could not save persistent state:",
3419
 
                               exc_info=e)
3420
 
                raise
3421
 
 
3422
 
        # Delete all clients, and settings from config
3423
 
        while tcp_server.clients:
3424
 
            name, client = tcp_server.clients.popitem()
3425
 
            if use_dbus:
3426
 
                client.remove_from_connection()
3427
 
            # Don't signal the disabling
3428
 
            client.disable(quiet=True)
3429
 
            # Emit D-Bus signal for removal
3430
 
            if use_dbus:
3431
 
                mandos_dbus_service.client_removed_signal(client)
3432
 
        client_settings.clear()
3433
 
 
3434
 
    atexit.register(cleanup)
3435
 
 
3436
 
    for client in tcp_server.clients.values():
 
1161
        
 
1162
        mandos_server = MandosServer()
 
1163
    
 
1164
    for client in clients:
3437
1165
        if use_dbus:
3438
 
            # Emit D-Bus signal for adding
3439
 
            mandos_dbus_service.client_added_signal(client)
3440
 
        # Need to initiate checking of clients
3441
 
        if client.enabled:
3442
 
            client.init_checker()
3443
 
 
 
1166
            # Emit D-Bus signal
 
1167
            mandos_server.ClientAdded(client.dbus_object_path,
 
1168
                                      client.GetAllProperties())
 
1169
        client.enable()
 
1170
    
3444
1171
    tcp_server.enable()
3445
1172
    tcp_server.server_activate()
3446
 
 
 
1173
    
3447
1174
    # Find out what port we got
3448
 
    if zeroconf:
3449
 
        service.port = tcp_server.socket.getsockname()[1]
3450
 
    if use_ipv6:
3451
 
        logger.info("Now listening on address %r, port %d,"
3452
 
                    " flowinfo %d, scope_id %d",
3453
 
                    *tcp_server.socket.getsockname())
3454
 
    else:                       # IPv4
3455
 
        logger.info("Now listening on address %r, port %d",
3456
 
                    *tcp_server.socket.getsockname())
3457
 
 
3458
 
    # service.interface = tcp_server.socket.getsockname()[3]
3459
 
 
 
1175
    service.port = tcp_server.socket.getsockname()[1]
 
1176
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
 
1177
                u" scope_id %d" % tcp_server.socket.getsockname())
 
1178
    
 
1179
    #service.interface = tcp_server.socket.getsockname()[3]
 
1180
    
3460
1181
    try:
3461
 
        if zeroconf:
3462
 
            # From the Avahi example code
3463
 
            try:
3464
 
                service.activate()
3465
 
            except dbus.exceptions.DBusException as error:
3466
 
                logger.critical("D-Bus Exception", exc_info=error)
3467
 
                cleanup()
3468
 
                sys.exit(1)
3469
 
            # End of Avahi example code
3470
 
 
3471
 
        GLib.io_add_watch(tcp_server.fileno(), GLib.IO_IN,
3472
 
                          lambda *args, **kwargs:
3473
 
                          (tcp_server.handle_request
3474
 
                           (*args[2:], **kwargs) or True))
3475
 
 
3476
 
        logger.debug("Starting main loop")
 
1182
        # From the Avahi example code
 
1183
        server.connect_to_signal("StateChanged", server_state_changed)
 
1184
        try:
 
1185
            server_state_changed(server.GetState())
 
1186
        except dbus.exceptions.DBusException, error:
 
1187
            logger.critical(u"DBusException: %s", error)
 
1188
            sys.exit(1)
 
1189
        # End of Avahi example code
 
1190
        
 
1191
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
1192
                             lambda *args, **kwargs:
 
1193
                             (tcp_server.handle_request
 
1194
                              (*args[2:], **kwargs) or True))
 
1195
        
 
1196
        logger.debug(u"Starting main loop")
3477
1197
        main_loop.run()
3478
 
    except AvahiError as error:
3479
 
        logger.critical("Avahi Error", exc_info=error)
3480
 
        cleanup()
 
1198
    except AvahiError, error:
 
1199
        logger.critical(u"AvahiError: %s", error)
3481
1200
        sys.exit(1)
3482
1201
    except KeyboardInterrupt:
3483
1202
        if debug:
3484
 
            print("", file=sys.stderr)
 
1203
            print >> sys.stderr
3485
1204
        logger.debug("Server received KeyboardInterrupt")
3486
1205
    logger.debug("Server exiting")
3487
 
    # Must run before the D-Bus bus name gets deregistered
3488
 
    cleanup()
3489
 
 
3490
1206
 
3491
1207
if __name__ == '__main__':
3492
1208
    main()