/mandos/trunk

To get this branch, use:
bzr branch http://bzr.recompile.se/loggerhead/mandos/trunk

« back to all changes in this revision

Viewing changes to mandos

  • Committer: Teddy Hogeborn
  • Date: 2008-09-21 13:42:34 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080921134234-jo8p4rwtm50yb4xj
* clients.conf ([bar]/secfile): Do not imply armored format.

* debian/control: Build-Depend on pkg-config.

* debian/mandos.prerm (remove): Bug fix; check for
                                "/etc/init.d/mandos", not
                                "/etc/init.d/ssh".

Show diffs side-by-side

added added

removed removed

Lines of Context:
1
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 © 2008-2019 Teddy Hogeborn
15
 
# Copyright © 2008-2019 Björn Påhlsson
16
 
#
17
 
# This file is part of Mandos.
18
 
#
19
 
# Mandos is free software: you can redistribute it and/or modify it
20
 
# under the terms of the GNU General Public License as published by
 
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
 
15
 
16
# This program is free software: you can redistribute it and/or modify
 
17
# it under the terms of the GNU General Public License as published by
21
18
# the Free Software Foundation, either version 3 of the License, or
22
19
# (at your option) any later version.
23
20
#
24
 
#     Mandos is distributed in the hope that it will be useful, but
25
 
#     WITHOUT ANY WARRANTY; without even the implied warranty of
 
21
#     This program is distributed in the hope that it will be useful,
 
22
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
26
23
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
27
24
#     GNU General Public License for more details.
28
 
#
 
25
29
26
# You should have received a copy of the GNU General Public License
30
 
# along with Mandos.  If not, see <http://www.gnu.org/licenses/>.
31
 
#
32
 
# Contact the authors at <mandos@recompile.se>.
33
 
#
34
 
 
35
 
from __future__ import (division, absolute_import, print_function,
36
 
                        unicode_literals)
37
 
 
38
 
try:
39
 
    from future_builtins import *
40
 
except ImportError:
41
 
    pass
42
 
 
43
 
try:
44
 
    import SocketServer as socketserver
45
 
except ImportError:
46
 
    import socketserver
 
27
# along with this program.  If not, see
 
28
# <http://www.gnu.org/licenses/>.
 
29
 
30
# Contact the authors at <mandos@fukt.bsnet.se>.
 
31
 
32
 
 
33
from __future__ import division
 
34
 
 
35
import SocketServer
47
36
import socket
48
 
import argparse
 
37
import select
 
38
from optparse import OptionParser
49
39
import datetime
50
40
import errno
51
 
try:
52
 
    import ConfigParser as configparser
53
 
except ImportError:
54
 
    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
55
48
import sys
56
49
import re
57
50
import os
58
51
import signal
 
52
from sets import Set
59
53
import subprocess
60
54
import atexit
61
55
import stat
62
56
import logging
63
57
import logging.handlers
64
58
import pwd
65
 
import contextlib
66
 
import struct
67
 
import fcntl
68
 
import functools
69
 
try:
70
 
    import cPickle as pickle
71
 
except ImportError:
72
 
    import pickle
73
 
import multiprocessing
74
 
import types
75
 
import binascii
76
 
import tempfile
77
 
import itertools
78
 
import collections
79
 
import codecs
80
59
 
81
60
import dbus
82
 
import dbus.service
83
 
from gi.repository import GLib
 
61
import gobject
 
62
import avahi
84
63
from dbus.mainloop.glib import DBusGMainLoop
85
64
import ctypes
86
 
import ctypes.util
87
 
import xml.dom.minidom
88
 
import inspect
89
 
 
90
 
# Try to find the value of SO_BINDTODEVICE:
91
 
try:
92
 
    # This is where SO_BINDTODEVICE is in Python 3.3 (or 3.4?) and
93
 
    # newer, and it is also the most natural place for it:
94
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
95
 
except AttributeError:
96
 
    try:
97
 
        # This is where SO_BINDTODEVICE was up to and including Python
98
 
        # 2.6, and also 3.2:
99
 
        from IN import SO_BINDTODEVICE
100
 
    except ImportError:
101
 
        # In Python 2.7 it seems to have been removed entirely.
102
 
        # Try running the C preprocessor:
103
 
        try:
104
 
            cc = subprocess.Popen(["cc", "--language=c", "-E",
105
 
                                   "/dev/stdin"],
106
 
                                  stdin=subprocess.PIPE,
107
 
                                  stdout=subprocess.PIPE)
108
 
            stdout = cc.communicate(
109
 
                "#include <sys/socket.h>\nSO_BINDTODEVICE\n")[0]
110
 
            SO_BINDTODEVICE = int(stdout.splitlines()[-1])
111
 
        except (OSError, ValueError, IndexError):
112
 
            # No value found
113
 
            SO_BINDTODEVICE = None
114
 
 
115
 
if sys.version_info.major == 2:
116
 
    str = unicode
117
 
 
118
 
version = "1.8.4"
119
 
stored_state_file = "clients.pickle"
120
 
 
121
 
logger = logging.getLogger()
122
 
syslogger = None
123
 
 
124
 
try:
125
 
    if_nametoindex = ctypes.cdll.LoadLibrary(
126
 
        ctypes.util.find_library("c")).if_nametoindex
127
 
except (OSError, AttributeError):
128
 
 
129
 
    def if_nametoindex(interface):
130
 
        "Get an interface index the hard way, i.e. using fcntl()"
131
 
        SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
132
 
        with contextlib.closing(socket.socket()) as s:
133
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
134
 
                                struct.pack(b"16s16x", interface))
135
 
        interface_index = struct.unpack("I", ifreq[16:20])[0]
136
 
        return interface_index
137
 
 
138
 
 
139
 
def copy_function(func):
140
 
    """Make a copy of a function"""
141
 
    if sys.version_info.major == 2:
142
 
        return types.FunctionType(func.func_code,
143
 
                                  func.func_globals,
144
 
                                  func.func_name,
145
 
                                  func.func_defaults,
146
 
                                  func.func_closure)
147
 
    else:
148
 
        return types.FunctionType(func.__code__,
149
 
                                  func.__globals__,
150
 
                                  func.__name__,
151
 
                                  func.__defaults__,
152
 
                                  func.__closure__)
153
 
 
154
 
 
155
 
def initlogger(debug, level=logging.WARNING):
156
 
    """init logger and add loglevel"""
157
 
 
158
 
    global syslogger
159
 
    syslogger = (logging.handlers.SysLogHandler(
160
 
        facility=logging.handlers.SysLogHandler.LOG_DAEMON,
161
 
        address="/dev/log"))
162
 
    syslogger.setFormatter(logging.Formatter
163
 
                           ('Mandos [%(process)d]: %(levelname)s:'
164
 
                            ' %(message)s'))
165
 
    logger.addHandler(syslogger)
166
 
 
167
 
    if debug:
168
 
        console = logging.StreamHandler()
169
 
        console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
170
 
                                               ' [%(process)d]:'
171
 
                                               ' %(levelname)s:'
172
 
                                               ' %(message)s'))
173
 
        logger.addHandler(console)
174
 
    logger.setLevel(level)
175
 
 
176
 
 
177
 
class PGPError(Exception):
178
 
    """Exception if encryption/decryption fails"""
179
 
    pass
180
 
 
181
 
 
182
 
class PGPEngine(object):
183
 
    """A simple class for OpenPGP symmetric encryption & decryption"""
184
 
 
185
 
    def __init__(self):
186
 
        self.tempdir = tempfile.mkdtemp(prefix="mandos-")
187
 
        self.gpg = "gpg"
188
 
        try:
189
 
            output = subprocess.check_output(["gpgconf"])
190
 
            for line in output.splitlines():
191
 
                name, text, path = line.split(b":")
192
 
                if name == "gpg":
193
 
                    self.gpg = path
194
 
                    break
195
 
        except OSError as e:
196
 
            if e.errno != errno.ENOENT:
197
 
                raise
198
 
        self.gnupgargs = ['--batch',
199
 
                          '--homedir', self.tempdir,
200
 
                          '--force-mdc',
201
 
                          '--quiet']
202
 
        # Only GPG version 1 has the --no-use-agent option.
203
 
        if self.gpg == "gpg" or self.gpg.endswith("/gpg"):
204
 
            self.gnupgargs.append("--no-use-agent")
205
 
 
206
 
    def __enter__(self):
207
 
        return self
208
 
 
209
 
    def __exit__(self, exc_type, exc_value, traceback):
210
 
        self._cleanup()
211
 
        return False
212
 
 
213
 
    def __del__(self):
214
 
        self._cleanup()
215
 
 
216
 
    def _cleanup(self):
217
 
        if self.tempdir is not None:
218
 
            # Delete contents of tempdir
219
 
            for root, dirs, files in os.walk(self.tempdir,
220
 
                                             topdown=False):
221
 
                for filename in files:
222
 
                    os.remove(os.path.join(root, filename))
223
 
                for dirname in dirs:
224
 
                    os.rmdir(os.path.join(root, dirname))
225
 
            # Remove tempdir
226
 
            os.rmdir(self.tempdir)
227
 
            self.tempdir = None
228
 
 
229
 
    def password_encode(self, password):
230
 
        # Passphrase can not be empty and can not contain newlines or
231
 
        # NUL bytes.  So we prefix it and hex encode it.
232
 
        encoded = b"mandos" + binascii.hexlify(password)
233
 
        if len(encoded) > 2048:
234
 
            # GnuPG can't handle long passwords, so encode differently
235
 
            encoded = (b"mandos" + password.replace(b"\\", b"\\\\")
236
 
                       .replace(b"\n", b"\\n")
237
 
                       .replace(b"\0", b"\\x00"))
238
 
        return encoded
239
 
 
240
 
    def encrypt(self, data, password):
241
 
        passphrase = self.password_encode(password)
242
 
        with tempfile.NamedTemporaryFile(
243
 
                dir=self.tempdir) as passfile:
244
 
            passfile.write(passphrase)
245
 
            passfile.flush()
246
 
            proc = subprocess.Popen([self.gpg, '--symmetric',
247
 
                                     '--passphrase-file',
248
 
                                     passfile.name]
249
 
                                    + self.gnupgargs,
250
 
                                    stdin=subprocess.PIPE,
251
 
                                    stdout=subprocess.PIPE,
252
 
                                    stderr=subprocess.PIPE)
253
 
            ciphertext, err = proc.communicate(input=data)
254
 
        if proc.returncode != 0:
255
 
            raise PGPError(err)
256
 
        return ciphertext
257
 
 
258
 
    def decrypt(self, data, password):
259
 
        passphrase = self.password_encode(password)
260
 
        with tempfile.NamedTemporaryFile(
261
 
                dir=self.tempdir) as passfile:
262
 
            passfile.write(passphrase)
263
 
            passfile.flush()
264
 
            proc = subprocess.Popen([self.gpg, '--decrypt',
265
 
                                     '--passphrase-file',
266
 
                                     passfile.name]
267
 
                                    + self.gnupgargs,
268
 
                                    stdin=subprocess.PIPE,
269
 
                                    stdout=subprocess.PIPE,
270
 
                                    stderr=subprocess.PIPE)
271
 
            decrypted_plaintext, err = proc.communicate(input=data)
272
 
        if proc.returncode != 0:
273
 
            raise PGPError(err)
274
 
        return decrypted_plaintext
275
 
 
276
 
 
277
 
# Pretend that we have an Avahi module
278
 
class avahi(object):
279
 
    """This isn't so much a class as it is a module-like namespace."""
280
 
    IF_UNSPEC = -1               # avahi-common/address.h
281
 
    PROTO_UNSPEC = -1            # avahi-common/address.h
282
 
    PROTO_INET = 0               # avahi-common/address.h
283
 
    PROTO_INET6 = 1              # avahi-common/address.h
284
 
    DBUS_NAME = "org.freedesktop.Avahi"
285
 
    DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"
286
 
    DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"
287
 
    DBUS_PATH_SERVER = "/"
288
 
 
289
 
    @staticmethod
290
 
    def string_array_to_txt_array(t):
291
 
        return dbus.Array((dbus.ByteArray(s.encode("utf-8"))
292
 
                           for s in t), signature="ay")
293
 
    ENTRY_GROUP_ESTABLISHED = 2  # avahi-common/defs.h
294
 
    ENTRY_GROUP_COLLISION = 3    # avahi-common/defs.h
295
 
    ENTRY_GROUP_FAILURE = 4      # avahi-common/defs.h
296
 
    SERVER_INVALID = 0           # avahi-common/defs.h
297
 
    SERVER_REGISTERING = 1       # avahi-common/defs.h
298
 
    SERVER_RUNNING = 2           # avahi-common/defs.h
299
 
    SERVER_COLLISION = 3         # avahi-common/defs.h
300
 
    SERVER_FAILURE = 4           # avahi-common/defs.h
301
 
 
 
65
 
 
66
version = "1.0"
 
67
 
 
68
logger = logging.Logger('mandos')
 
69
syslogger = logging.handlers.SysLogHandler\
 
70
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
71
             address = "/dev/log")
 
72
syslogger.setFormatter(logging.Formatter\
 
73
                        ('Mandos: %(levelname)s: %(message)s'))
 
74
logger.addHandler(syslogger)
 
75
 
 
76
console = logging.StreamHandler()
 
77
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
 
78
                                       ' %(message)s'))
 
79
logger.addHandler(console)
302
80
 
303
81
class AvahiError(Exception):
304
 
    def __init__(self, value, *args, **kwargs):
 
82
    def __init__(self, value):
305
83
        self.value = value
306
 
        return super(AvahiError, self).__init__(value, *args,
307
 
                                                **kwargs)
308
 
 
 
84
    def __str__(self):
 
85
        return repr(self.value)
309
86
 
310
87
class AvahiServiceError(AvahiError):
311
88
    pass
312
89
 
313
 
 
314
90
class AvahiGroupError(AvahiError):
315
91
    pass
316
92
 
317
93
 
318
94
class AvahiService(object):
319
95
    """An Avahi (Zeroconf) service.
320
 
 
321
96
    Attributes:
322
97
    interface: integer; avahi.IF_UNSPEC or an interface index.
323
98
               Used to optionally bind to the specified interface.
324
99
    name: string; Example: 'Mandos'
325
100
    type: string; Example: '_mandos._tcp'.
326
 
     See <https://www.iana.org/assignments/service-names-port-numbers>
 
101
                  See <http://www.dns-sd.org/ServiceTypes.html>
327
102
    port: integer; what port to announce
328
103
    TXT: list of strings; TXT record for the service
329
104
    domain: string; Domain to publish on, default to .local if empty.
331
106
    max_renames: integer; maximum number of renames
332
107
    rename_count: integer; counter so we only rename after collisions
333
108
                  a sensible number of times
334
 
    group: D-Bus Entry Group
335
 
    server: D-Bus Server
336
 
    bus: dbus.SystemBus()
337
109
    """
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):
 
110
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
 
111
                 type = None, port = None, TXT = None, domain = "",
 
112
                 host = "", max_renames = 32768):
350
113
        self.interface = interface
351
114
        self.name = name
352
 
        self.type = servicetype
 
115
        self.type = type
353
116
        self.port = port
354
 
        self.TXT = TXT if TXT is not None else []
 
117
        if TXT is None:
 
118
            self.TXT = []
 
119
        else:
 
120
            self.TXT = TXT
355
121
        self.domain = domain
356
122
        self.host = host
357
123
        self.rename_count = 0
358
124
        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):
 
125
    def rename(self):
366
126
        """Derived from the Avahi example code"""
367
127
        if self.rename_count >= self.max_renames:
368
 
            logger.critical("No suitable Zeroconf service name found"
369
 
                            " after %i retries, exiting.",
370
 
                            self.rename_count)
 
128
            logger.critical(u"No suitable Zeroconf service name found"
 
129
                            u" after %i retries, exiting.",
 
130
                            rename_count)
371
131
            raise AvahiServiceError("Too many renames")
372
 
        self.name = str(
373
 
            self.server.GetAlternativeServiceName(self.name))
 
132
        self.name = server.GetAlternativeServiceName(self.name)
 
133
        logger.info(u"Changing Zeroconf service name to %r ...",
 
134
                    str(self.name))
 
135
        syslogger.setFormatter(logging.Formatter\
 
136
                               ('Mandos (%s): %%(levelname)s:'
 
137
                               ' %%(message)s' % self.name))
 
138
        self.remove()
 
139
        self.add()
374
140
        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
141
    def remove(self):
392
142
        """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
 
 
 
143
        if group is not None:
 
144
            group.Reset()
399
145
    def add(self):
400
146
        """Derived from the Avahi example code"""
401
 
        self.remove()
402
 
        if self.group is None:
403
 
            self.group = dbus.Interface(
404
 
                self.bus.get_object(avahi.DBUS_NAME,
405
 
                                    self.server.EntryGroupNew()),
406
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
407
 
        self.entry_group_state_changed_match = (
408
 
            self.group.connect_to_signal(
409
 
                'StateChanged', self.entry_group_state_changed))
410
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
411
 
                     self.name, self.type)
412
 
        self.group.AddService(
413
 
            self.interface,
414
 
            self.protocol,
415
 
            dbus.UInt32(0),     # flags
416
 
            self.name, self.type,
417
 
            self.domain, self.host,
418
 
            dbus.UInt16(self.port),
419
 
            avahi.string_array_to_txt_array(self.TXT))
420
 
        self.group.Commit()
421
 
 
422
 
    def entry_group_state_changed(self, state, error):
423
 
        """Derived from the Avahi example code"""
424
 
        logger.debug("Avahi entry group state change: %i", state)
425
 
 
426
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
427
 
            logger.debug("Zeroconf service established.")
428
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
429
 
            logger.info("Zeroconf service name collision.")
430
 
            self.rename()
431
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
432
 
            logger.critical("Avahi: Error in group state changed %s",
433
 
                            str(error))
434
 
            raise AvahiGroupError("State changed: {!s}".format(error))
435
 
 
436
 
    def cleanup(self):
437
 
        """Derived from the Avahi example code"""
438
 
        if self.group is not None:
439
 
            try:
440
 
                self.group.Free()
441
 
            except (dbus.exceptions.UnknownMethodException,
442
 
                    dbus.exceptions.DBusException):
443
 
                pass
444
 
            self.group = None
445
 
        self.remove()
446
 
 
447
 
    def server_state_changed(self, state, error=None):
448
 
        """Derived from the Avahi example code"""
449
 
        logger.debug("Avahi server state change: %i", state)
450
 
        bad_states = {
451
 
            avahi.SERVER_INVALID: "Zeroconf server invalid",
452
 
            avahi.SERVER_REGISTERING: None,
453
 
            avahi.SERVER_COLLISION: "Zeroconf server name collision",
454
 
            avahi.SERVER_FAILURE: "Zeroconf server failure",
455
 
        }
456
 
        if state in bad_states:
457
 
            if bad_states[state] is not None:
458
 
                if error is None:
459
 
                    logger.error(bad_states[state])
460
 
                else:
461
 
                    logger.error(bad_states[state] + ": %r", error)
462
 
            self.cleanup()
463
 
        elif state == avahi.SERVER_RUNNING:
464
 
            try:
465
 
                self.add()
466
 
            except dbus.exceptions.DBusException as error:
467
 
                if (error.get_dbus_name()
468
 
                    == "org.freedesktop.Avahi.CollisionError"):
469
 
                    logger.info("Local Zeroconf service name"
470
 
                                " collision.")
471
 
                    return self.rename(remove=False)
472
 
                else:
473
 
                    logger.critical("D-Bus Exception", exc_info=error)
474
 
                    self.cleanup()
475
 
                    os._exit(1)
476
 
        else:
477
 
            if error is None:
478
 
                logger.debug("Unknown state: %r", state)
479
 
            else:
480
 
                logger.debug("Unknown state: %r: %r", state, error)
481
 
 
482
 
    def activate(self):
483
 
        """Derived from the Avahi example code"""
484
 
        if self.server is None:
485
 
            self.server = dbus.Interface(
486
 
                self.bus.get_object(avahi.DBUS_NAME,
487
 
                                    avahi.DBUS_PATH_SERVER,
488
 
                                    follow_name_owner_changes=True),
489
 
                avahi.DBUS_INTERFACE_SERVER)
490
 
        self.server.connect_to_signal("StateChanged",
491
 
                                      self.server_state_changed)
492
 
        self.server_state_changed(self.server.GetState())
493
 
 
494
 
 
495
 
class AvahiServiceToSyslog(AvahiService):
496
 
    def rename(self, *args, **kwargs):
497
 
        """Add the new name to the syslog messages"""
498
 
        ret = super(AvahiServiceToSyslog, self).rename(*args, **kwargs)
499
 
        syslogger.setFormatter(logging.Formatter(
500
 
            'Mandos ({}) [%(process)d]: %(levelname)s: %(message)s'
501
 
            .format(self.name)))
502
 
        return ret
503
 
 
504
 
 
505
 
# Pretend that we have a GnuTLS module
506
 
class gnutls(object):
507
 
    """This isn't so much a class as it is a module-like namespace."""
508
 
 
509
 
    library = ctypes.util.find_library("gnutls")
510
 
    if library is None:
511
 
        library = ctypes.util.find_library("gnutls-deb0")
512
 
    _library = ctypes.cdll.LoadLibrary(library)
513
 
    del library
514
 
 
515
 
    # Unless otherwise indicated, the constants and types below are
516
 
    # all from the gnutls/gnutls.h C header file.
517
 
 
518
 
    # Constants
519
 
    E_SUCCESS = 0
520
 
    E_INTERRUPTED = -52
521
 
    E_AGAIN = -28
522
 
    CRT_OPENPGP = 2
523
 
    CRT_RAWPK = 3
524
 
    CLIENT = 2
525
 
    SHUT_RDWR = 0
526
 
    CRD_CERTIFICATE = 1
527
 
    E_NO_CERTIFICATE_FOUND = -49
528
 
    X509_FMT_DER = 0
529
 
    NO_TICKETS = 1<<10
530
 
    ENABLE_RAWPK = 1<<18
531
 
    CTYPE_PEERS = 3
532
 
    KEYID_USE_SHA256 = 1        # gnutls/x509.h
533
 
    OPENPGP_FMT_RAW = 0         # gnutls/openpgp.h
534
 
 
535
 
    # Types
536
 
    class session_int(ctypes.Structure):
537
 
        _fields_ = []
538
 
    session_t = ctypes.POINTER(session_int)
539
 
 
540
 
    class certificate_credentials_st(ctypes.Structure):
541
 
        _fields_ = []
542
 
    certificate_credentials_t = ctypes.POINTER(
543
 
        certificate_credentials_st)
544
 
    certificate_type_t = ctypes.c_int
545
 
 
546
 
    class datum_t(ctypes.Structure):
547
 
        _fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),
548
 
                    ('size', ctypes.c_uint)]
549
 
 
550
 
    class openpgp_crt_int(ctypes.Structure):
551
 
        _fields_ = []
552
 
    openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)
553
 
    openpgp_crt_fmt_t = ctypes.c_int  # gnutls/openpgp.h
554
 
    log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)
555
 
    credentials_type_t = ctypes.c_int
556
 
    transport_ptr_t = ctypes.c_void_p
557
 
    close_request_t = ctypes.c_int
558
 
 
559
 
    # Exceptions
560
 
    class Error(Exception):
561
 
        def __init__(self, message=None, code=None, args=()):
562
 
            # Default usage is by a message string, but if a return
563
 
            # code is passed, convert it to a string with
564
 
            # gnutls.strerror()
565
 
            self.code = code
566
 
            if message is None and code is not None:
567
 
                message = gnutls.strerror(code)
568
 
            return super(gnutls.Error, self).__init__(
569
 
                message, *args)
570
 
 
571
 
    class CertificateSecurityError(Error):
572
 
        pass
573
 
 
574
 
    # Classes
575
 
    class Credentials(object):
576
 
        def __init__(self):
577
 
            self._c_object = gnutls.certificate_credentials_t()
578
 
            gnutls.certificate_allocate_credentials(
579
 
                ctypes.byref(self._c_object))
580
 
            self.type = gnutls.CRD_CERTIFICATE
581
 
 
582
 
        def __del__(self):
583
 
            gnutls.certificate_free_credentials(self._c_object)
584
 
 
585
 
    class ClientSession(object):
586
 
        def __init__(self, socket, credentials=None):
587
 
            self._c_object = gnutls.session_t()
588
 
            gnutls_flags = gnutls.CLIENT
589
 
            if gnutls.check_version(b"3.5.6"):
590
 
                gnutls_flags |= gnutls.NO_TICKETS
591
 
            if gnutls.has_rawpk:
592
 
                gnutls_flags |= gnutls.ENABLE_RAWPK
593
 
            gnutls.init(ctypes.byref(self._c_object), gnutls_flags)
594
 
            del gnutls_flags
595
 
            gnutls.set_default_priority(self._c_object)
596
 
            gnutls.transport_set_ptr(self._c_object, socket.fileno())
597
 
            gnutls.handshake_set_private_extensions(self._c_object,
598
 
                                                    True)
599
 
            self.socket = socket
600
 
            if credentials is None:
601
 
                credentials = gnutls.Credentials()
602
 
            gnutls.credentials_set(self._c_object, credentials.type,
603
 
                                   ctypes.cast(credentials._c_object,
604
 
                                               ctypes.c_void_p))
605
 
            self.credentials = credentials
606
 
 
607
 
        def __del__(self):
608
 
            gnutls.deinit(self._c_object)
609
 
 
610
 
        def handshake(self):
611
 
            return gnutls.handshake(self._c_object)
612
 
 
613
 
        def send(self, data):
614
 
            data = bytes(data)
615
 
            data_len = len(data)
616
 
            while data_len > 0:
617
 
                data_len -= gnutls.record_send(self._c_object,
618
 
                                               data[-data_len:],
619
 
                                               data_len)
620
 
 
621
 
        def bye(self):
622
 
            return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)
623
 
 
624
 
    # Error handling functions
625
 
    def _error_code(result):
626
 
        """A function to raise exceptions on errors, suitable
627
 
        for the 'restype' attribute on ctypes functions"""
628
 
        if result >= 0:
629
 
            return result
630
 
        if result == gnutls.E_NO_CERTIFICATE_FOUND:
631
 
            raise gnutls.CertificateSecurityError(code=result)
632
 
        raise gnutls.Error(code=result)
633
 
 
634
 
    def _retry_on_error(result, func, arguments):
635
 
        """A function to retry on some errors, suitable
636
 
        for the 'errcheck' attribute on ctypes functions"""
637
 
        while result < 0:
638
 
            if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):
639
 
                return _error_code(result)
640
 
            result = func(*arguments)
641
 
        return result
642
 
 
643
 
    # Unless otherwise indicated, the function declarations below are
644
 
    # all from the gnutls/gnutls.h C header file.
645
 
 
646
 
    # Functions
647
 
    priority_set_direct = _library.gnutls_priority_set_direct
648
 
    priority_set_direct.argtypes = [session_t, ctypes.c_char_p,
649
 
                                    ctypes.POINTER(ctypes.c_char_p)]
650
 
    priority_set_direct.restype = _error_code
651
 
 
652
 
    init = _library.gnutls_init
653
 
    init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]
654
 
    init.restype = _error_code
655
 
 
656
 
    set_default_priority = _library.gnutls_set_default_priority
657
 
    set_default_priority.argtypes = [session_t]
658
 
    set_default_priority.restype = _error_code
659
 
 
660
 
    record_send = _library.gnutls_record_send
661
 
    record_send.argtypes = [session_t, ctypes.c_void_p,
662
 
                            ctypes.c_size_t]
663
 
    record_send.restype = ctypes.c_ssize_t
664
 
    record_send.errcheck = _retry_on_error
665
 
 
666
 
    certificate_allocate_credentials = (
667
 
        _library.gnutls_certificate_allocate_credentials)
668
 
    certificate_allocate_credentials.argtypes = [
669
 
        ctypes.POINTER(certificate_credentials_t)]
670
 
    certificate_allocate_credentials.restype = _error_code
671
 
 
672
 
    certificate_free_credentials = (
673
 
        _library.gnutls_certificate_free_credentials)
674
 
    certificate_free_credentials.argtypes = [
675
 
        certificate_credentials_t]
676
 
    certificate_free_credentials.restype = None
677
 
 
678
 
    handshake_set_private_extensions = (
679
 
        _library.gnutls_handshake_set_private_extensions)
680
 
    handshake_set_private_extensions.argtypes = [session_t,
681
 
                                                 ctypes.c_int]
682
 
    handshake_set_private_extensions.restype = None
683
 
 
684
 
    credentials_set = _library.gnutls_credentials_set
685
 
    credentials_set.argtypes = [session_t, credentials_type_t,
686
 
                                ctypes.c_void_p]
687
 
    credentials_set.restype = _error_code
688
 
 
689
 
    strerror = _library.gnutls_strerror
690
 
    strerror.argtypes = [ctypes.c_int]
691
 
    strerror.restype = ctypes.c_char_p
692
 
 
693
 
    certificate_type_get = _library.gnutls_certificate_type_get
694
 
    certificate_type_get.argtypes = [session_t]
695
 
    certificate_type_get.restype = _error_code
696
 
 
697
 
    certificate_get_peers = _library.gnutls_certificate_get_peers
698
 
    certificate_get_peers.argtypes = [session_t,
699
 
                                      ctypes.POINTER(ctypes.c_uint)]
700
 
    certificate_get_peers.restype = ctypes.POINTER(datum_t)
701
 
 
702
 
    global_set_log_level = _library.gnutls_global_set_log_level
703
 
    global_set_log_level.argtypes = [ctypes.c_int]
704
 
    global_set_log_level.restype = None
705
 
 
706
 
    global_set_log_function = _library.gnutls_global_set_log_function
707
 
    global_set_log_function.argtypes = [log_func]
708
 
    global_set_log_function.restype = None
709
 
 
710
 
    deinit = _library.gnutls_deinit
711
 
    deinit.argtypes = [session_t]
712
 
    deinit.restype = None
713
 
 
714
 
    handshake = _library.gnutls_handshake
715
 
    handshake.argtypes = [session_t]
716
 
    handshake.restype = _error_code
717
 
    handshake.errcheck = _retry_on_error
718
 
 
719
 
    transport_set_ptr = _library.gnutls_transport_set_ptr
720
 
    transport_set_ptr.argtypes = [session_t, transport_ptr_t]
721
 
    transport_set_ptr.restype = None
722
 
 
723
 
    bye = _library.gnutls_bye
724
 
    bye.argtypes = [session_t, close_request_t]
725
 
    bye.restype = _error_code
726
 
    bye.errcheck = _retry_on_error
727
 
 
728
 
    check_version = _library.gnutls_check_version
729
 
    check_version.argtypes = [ctypes.c_char_p]
730
 
    check_version.restype = ctypes.c_char_p
731
 
 
732
 
    _need_version = b"3.3.0"
733
 
    if check_version(_need_version) is None:
734
 
        raise self.Error("Needs GnuTLS {} or later"
735
 
                         .format(_need_version))
736
 
 
737
 
    _tls_rawpk_version = b"3.6.6"
738
 
    has_rawpk = bool(check_version(_tls_rawpk_version))
739
 
 
740
 
    if has_rawpk:
741
 
        # Types
742
 
        class pubkey_st(ctypes.Structure):
743
 
            _fields = []
744
 
        pubkey_t = ctypes.POINTER(pubkey_st)
745
 
 
746
 
        x509_crt_fmt_t = ctypes.c_int
747
 
 
748
 
        # All the function declarations below are from gnutls/abstract.h
749
 
        pubkey_init = _library.gnutls_pubkey_init
750
 
        pubkey_init.argtypes = [ctypes.POINTER(pubkey_t)]
751
 
        pubkey_init.restype = _error_code
752
 
 
753
 
        pubkey_import = _library.gnutls_pubkey_import
754
 
        pubkey_import.argtypes = [pubkey_t, ctypes.POINTER(datum_t),
755
 
                                  x509_crt_fmt_t]
756
 
        pubkey_import.restype = _error_code
757
 
 
758
 
        pubkey_get_key_id = _library.gnutls_pubkey_get_key_id
759
 
        pubkey_get_key_id.argtypes = [pubkey_t, ctypes.c_int,
760
 
                                      ctypes.POINTER(ctypes.c_ubyte),
761
 
                                      ctypes.POINTER(ctypes.c_size_t)]
762
 
        pubkey_get_key_id.restype = _error_code
763
 
 
764
 
        pubkey_deinit = _library.gnutls_pubkey_deinit
765
 
        pubkey_deinit.argtypes = [pubkey_t]
766
 
        pubkey_deinit.restype = None
767
 
    else:
768
 
        # All the function declarations below are from gnutls/openpgp.h
769
 
 
770
 
        openpgp_crt_init = _library.gnutls_openpgp_crt_init
771
 
        openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]
772
 
        openpgp_crt_init.restype = _error_code
773
 
 
774
 
        openpgp_crt_import = _library.gnutls_openpgp_crt_import
775
 
        openpgp_crt_import.argtypes = [openpgp_crt_t,
776
 
                                       ctypes.POINTER(datum_t),
777
 
                                       openpgp_crt_fmt_t]
778
 
        openpgp_crt_import.restype = _error_code
779
 
 
780
 
        openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self
781
 
        openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,
782
 
                                            ctypes.POINTER(ctypes.c_uint)]
783
 
        openpgp_crt_verify_self.restype = _error_code
784
 
 
785
 
        openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit
786
 
        openpgp_crt_deinit.argtypes = [openpgp_crt_t]
787
 
        openpgp_crt_deinit.restype = None
788
 
 
789
 
        openpgp_crt_get_fingerprint = (
790
 
            _library.gnutls_openpgp_crt_get_fingerprint)
791
 
        openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,
792
 
                                                ctypes.c_void_p,
793
 
                                                ctypes.POINTER(
794
 
                                                    ctypes.c_size_t)]
795
 
        openpgp_crt_get_fingerprint.restype = _error_code
796
 
 
797
 
    if check_version(b"3.6.4"):
798
 
        certificate_type_get2 = _library.gnutls_certificate_type_get2
799
 
        certificate_type_get2.argtypes = [session_t, ctypes.c_int]
800
 
        certificate_type_get2.restype = _error_code
801
 
 
802
 
    # Remove non-public functions
803
 
    del _error_code, _retry_on_error
804
 
 
805
 
 
806
 
def call_pipe(connection,       # : multiprocessing.Connection
807
 
              func, *args, **kwargs):
808
 
    """This function is meant to be called by multiprocessing.Process
809
 
 
810
 
    This function runs func(*args, **kwargs), and writes the resulting
811
 
    return value on the provided multiprocessing.Connection.
812
 
    """
813
 
    connection.send(func(*args, **kwargs))
814
 
    connection.close()
 
147
        global group
 
148
        if group is None:
 
149
            group = dbus.Interface\
 
150
                    (bus.get_object(avahi.DBUS_NAME,
 
151
                                    server.EntryGroupNew()),
 
152
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
153
            group.connect_to_signal('StateChanged',
 
154
                                    entry_group_state_changed)
 
155
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
156
                     service.name, service.type)
 
157
        group.AddService(
 
158
                self.interface,         # interface
 
159
                avahi.PROTO_INET6,      # protocol
 
160
                dbus.UInt32(0),         # flags
 
161
                self.name, self.type,
 
162
                self.domain, self.host,
 
163
                dbus.UInt16(self.port),
 
164
                avahi.string_array_to_txt_array(self.TXT))
 
165
        group.Commit()
 
166
 
 
167
# From the Avahi example code:
 
168
group = None                            # our entry group
 
169
# End of Avahi example code
815
170
 
816
171
 
817
172
class Client(object):
818
173
    """A representation of a client host served by this server.
819
 
 
820
174
    Attributes:
821
 
    approved:   bool(); 'None' if not yet approved/disapproved
822
 
    approval_delay: datetime.timedelta(); Time to wait for approval
823
 
    approval_duration: datetime.timedelta(); Duration of one approval
824
 
    checker: multiprocessing.Process(); a running checker process used
825
 
             to see if the client lives. 'None' if no process is
826
 
             running.
827
 
    checker_callback_tag: a GLib event source tag, or None
828
 
    checker_command: string; External command which is run to check
829
 
                     if client lives.  %() expansions are done at
 
175
    name:      string; from the config file, used in log messages
 
176
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
177
                 uniquely identify the client
 
178
    secret:    bytestring; sent verbatim (over TLS) to client
 
179
    host:      string; available for use by the checker command
 
180
    created:   datetime.datetime(); object creation, not client host
 
181
    last_checked_ok: datetime.datetime() or None if not yet checked OK
 
182
    timeout:   datetime.timedelta(); How long from last_checked_ok
 
183
                                     until this client is invalid
 
184
    interval:  datetime.timedelta(); How often to start a new checker
 
185
    stop_hook: If set, called by stop() as stop_hook(self)
 
186
    checker:   subprocess.Popen(); a running checker process used
 
187
                                   to see if the client lives.
 
188
                                   'None' if no process is running.
 
189
    checker_initiator_tag: a gobject event source tag, or None
 
190
    stop_initiator_tag:    - '' -
 
191
    checker_callback_tag:  - '' -
 
192
    checker_command: string; External command which is run to check if
 
193
                     client lives.  %() expansions are done at
830
194
                     runtime with vars(self) as dict, so that for
831
195
                     instance %(name)s can be used in the command.
832
 
    checker_initiator_tag: a GLib event source tag, or None
833
 
    created:    datetime.datetime(); (UTC) object creation
834
 
    client_structure: Object describing what attributes a client has
835
 
                      and is used for storing the client at exit
836
 
    current_checker_command: string; current running checker_command
837
 
    disable_initiator_tag: a GLib event source tag, or None
838
 
    enabled:    bool()
839
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
840
 
                 uniquely identify an OpenPGP client
841
 
    key_id: string (64 hexadecimal digits); used to uniquely identify
842
 
            a client using raw public keys
843
 
    host:       string; available for use by the checker command
844
 
    interval:   datetime.timedelta(); How often to start a new checker
845
 
    last_approval_request: datetime.datetime(); (UTC) or None
846
 
    last_checked_ok: datetime.datetime(); (UTC) or None
847
 
    last_checker_status: integer between 0 and 255 reflecting exit
848
 
                         status of last checker. -1 reflects crashed
849
 
                         checker, -2 means no checker completed yet.
850
 
    last_checker_signal: The signal which killed the last checker, if
851
 
                         last_checker_status is -1
852
 
    last_enabled: datetime.datetime(); (UTC) or None
853
 
    name:       string; from the config file, used in log messages and
854
 
                        D-Bus identifiers
855
 
    secret:     bytestring; sent verbatim (over TLS) to client
856
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
857
 
                                      until this client is disabled
858
 
    extended_timeout:   extra long timeout when secret has been sent
859
 
    runtime_expansions: Allowed attributes for runtime expansion.
860
 
    expires:    datetime.datetime(); time (UTC) when a client will be
861
 
                disabled, or None
862
 
    server_settings: The server_settings dict from main()
 
196
    Private attibutes:
 
197
    _timeout: Real variable for 'timeout'
 
198
    _interval: Real variable for 'interval'
 
199
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
200
    _interval_milliseconds: - '' -
863
201
    """
864
 
 
865
 
    runtime_expansions = ("approval_delay", "approval_duration",
866
 
                          "created", "enabled", "expires", "key_id",
867
 
                          "fingerprint", "host", "interval",
868
 
                          "last_approval_request", "last_checked_ok",
869
 
                          "last_enabled", "name", "timeout")
870
 
    client_defaults = {
871
 
        "timeout": "PT5M",
872
 
        "extended_timeout": "PT15M",
873
 
        "interval": "PT2M",
874
 
        "checker": "fping -q -- %%(host)s",
875
 
        "host": "",
876
 
        "approval_delay": "PT0S",
877
 
        "approval_duration": "PT1S",
878
 
        "approved_by_default": "True",
879
 
        "enabled": "True",
880
 
    }
881
 
 
882
 
    @staticmethod
883
 
    def config_parser(config):
884
 
        """Construct a new dict of client settings of this form:
885
 
        { client_name: {setting_name: value, ...}, ...}
886
 
        with exceptions for any special settings as defined above.
887
 
        NOTE: Must be a pure function. Must return the same result
888
 
        value given the same arguments.
889
 
        """
890
 
        settings = {}
891
 
        for client_name in config.sections():
892
 
            section = dict(config.items(client_name))
893
 
            client = settings[client_name] = {}
894
 
 
895
 
            client["host"] = section["host"]
896
 
            # Reformat values from string types to Python types
897
 
            client["approved_by_default"] = config.getboolean(
898
 
                client_name, "approved_by_default")
899
 
            client["enabled"] = config.getboolean(client_name,
900
 
                                                  "enabled")
901
 
 
902
 
            # Uppercase and remove spaces from key_id and fingerprint
903
 
            # for later comparison purposes with return value from the
904
 
            # key_id() and fingerprint() functions
905
 
            client["key_id"] = (section.get("key_id", "").upper()
906
 
                                .replace(" ", ""))
907
 
            client["fingerprint"] = (section["fingerprint"].upper()
908
 
                                     .replace(" ", ""))
909
 
            if "secret" in section:
910
 
                client["secret"] = codecs.decode(section["secret"]
911
 
                                                 .encode("utf-8"),
912
 
                                                 "base64")
913
 
            elif "secfile" in section:
914
 
                with open(os.path.expanduser(os.path.expandvars
915
 
                                             (section["secfile"])),
916
 
                          "rb") as secfile:
917
 
                    client["secret"] = secfile.read()
918
 
            else:
919
 
                raise TypeError("No secret or secfile for section {}"
920
 
                                .format(section))
921
 
            client["timeout"] = string_to_delta(section["timeout"])
922
 
            client["extended_timeout"] = string_to_delta(
923
 
                section["extended_timeout"])
924
 
            client["interval"] = string_to_delta(section["interval"])
925
 
            client["approval_delay"] = string_to_delta(
926
 
                section["approval_delay"])
927
 
            client["approval_duration"] = string_to_delta(
928
 
                section["approval_duration"])
929
 
            client["checker_command"] = section["checker"]
930
 
            client["last_approval_request"] = None
931
 
            client["last_checked_ok"] = None
932
 
            client["last_checker_status"] = -2
933
 
 
934
 
        return settings
935
 
 
936
 
    def __init__(self, settings, name=None, server_settings=None):
 
202
    def _set_timeout(self, timeout):
 
203
        "Setter function for 'timeout' attribute"
 
204
        self._timeout = timeout
 
205
        self._timeout_milliseconds = ((self.timeout.days
 
206
                                       * 24 * 60 * 60 * 1000)
 
207
                                      + (self.timeout.seconds * 1000)
 
208
                                      + (self.timeout.microseconds
 
209
                                         // 1000))
 
210
    timeout = property(lambda self: self._timeout,
 
211
                       _set_timeout)
 
212
    del _set_timeout
 
213
    def _set_interval(self, interval):
 
214
        "Setter function for 'interval' attribute"
 
215
        self._interval = interval
 
216
        self._interval_milliseconds = ((self.interval.days
 
217
                                        * 24 * 60 * 60 * 1000)
 
218
                                       + (self.interval.seconds
 
219
                                          * 1000)
 
220
                                       + (self.interval.microseconds
 
221
                                          // 1000))
 
222
    interval = property(lambda self: self._interval,
 
223
                        _set_interval)
 
224
    del _set_interval
 
225
    def __init__(self, name = None, stop_hook=None, config={}):
 
226
        """Note: the 'checker' key in 'config' sets the
 
227
        'checker_command' attribute and *not* the 'checker'
 
228
        attribute."""
937
229
        self.name = name
938
 
        if server_settings is None:
939
 
            server_settings = {}
940
 
        self.server_settings = server_settings
941
 
        # adding all client settings
942
 
        for setting, value in settings.items():
943
 
            setattr(self, setting, value)
944
 
 
945
 
        if self.enabled:
946
 
            if not hasattr(self, "last_enabled"):
947
 
                self.last_enabled = datetime.datetime.utcnow()
948
 
            if not hasattr(self, "expires"):
949
 
                self.expires = (datetime.datetime.utcnow()
950
 
                                + self.timeout)
 
230
        logger.debug(u"Creating client %r", self.name)
 
231
        # Uppercase and remove spaces from fingerprint for later
 
232
        # comparison purposes with return value from the fingerprint()
 
233
        # function
 
234
        self.fingerprint = config["fingerprint"].upper()\
 
235
                           .replace(u" ", u"")
 
236
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
 
237
        if "secret" in config:
 
238
            self.secret = config["secret"].decode(u"base64")
 
239
        elif "secfile" in config:
 
240
            sf = open(config["secfile"])
 
241
            self.secret = sf.read()
 
242
            sf.close()
951
243
        else:
952
 
            self.last_enabled = None
953
 
            self.expires = None
954
 
 
955
 
        logger.debug("Creating client %r", self.name)
956
 
        logger.debug("  Key ID: %s", self.key_id)
957
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
958
 
        self.created = settings.get("created",
959
 
                                    datetime.datetime.utcnow())
960
 
 
961
 
        # attributes specific for this server instance
 
244
            raise TypeError(u"No secret or secfile for client %s"
 
245
                            % self.name)
 
246
        self.host = config.get("host", "")
 
247
        self.created = datetime.datetime.now()
 
248
        self.last_checked_ok = None
 
249
        self.timeout = string_to_delta(config["timeout"])
 
250
        self.interval = string_to_delta(config["interval"])
 
251
        self.stop_hook = stop_hook
962
252
        self.checker = None
963
253
        self.checker_initiator_tag = None
964
 
        self.disable_initiator_tag = None
 
254
        self.stop_initiator_tag = None
965
255
        self.checker_callback_tag = None
966
 
        self.current_checker_command = None
967
 
        self.approved = None
968
 
        self.approvals_pending = 0
969
 
        self.changedstate = multiprocessing_manager.Condition(
970
 
            multiprocessing_manager.Lock())
971
 
        self.client_structure = [attr
972
 
                                 for attr in self.__dict__.keys()
973
 
                                 if not attr.startswith("_")]
974
 
        self.client_structure.append("client_structure")
975
 
 
976
 
        for name, t in inspect.getmembers(
977
 
                type(self), lambda obj: isinstance(obj, property)):
978
 
            if not name.startswith("_"):
979
 
                self.client_structure.append(name)
980
 
 
981
 
    # Send notice to process children that client state has changed
982
 
    def send_changedstate(self):
983
 
        with self.changedstate:
984
 
            self.changedstate.notify_all()
985
 
 
986
 
    def enable(self):
 
256
        self.check_command = config["checker"]
 
257
    def start(self):
987
258
        """Start this client's checker and timeout hooks"""
988
 
        if getattr(self, "enabled", False):
989
 
            # Already enabled
990
 
            return
991
 
        self.expires = datetime.datetime.utcnow() + self.timeout
992
 
        self.enabled = True
993
 
        self.last_enabled = datetime.datetime.utcnow()
994
 
        self.init_checker()
995
 
        self.send_changedstate()
996
 
 
997
 
    def disable(self, quiet=True):
998
 
        """Disable this client."""
999
 
        if not getattr(self, "enabled", False):
1000
 
            return False
1001
 
        if not quiet:
1002
 
            logger.info("Disabling client %s", self.name)
1003
 
        if getattr(self, "disable_initiator_tag", None) is not None:
1004
 
            GLib.source_remove(self.disable_initiator_tag)
1005
 
            self.disable_initiator_tag = None
1006
 
        self.expires = None
1007
 
        if getattr(self, "checker_initiator_tag", None) is not None:
1008
 
            GLib.source_remove(self.checker_initiator_tag)
1009
 
            self.checker_initiator_tag = None
1010
 
        self.stop_checker()
1011
 
        self.enabled = False
1012
 
        if not quiet:
1013
 
            self.send_changedstate()
1014
 
        # Do not run this again if called by a GLib.timeout_add
1015
 
        return False
1016
 
 
1017
 
    def __del__(self):
1018
 
        self.disable()
1019
 
 
1020
 
    def init_checker(self):
1021
259
        # Schedule a new checker to be started an 'interval' from now,
1022
260
        # and every interval from then on.
1023
 
        if self.checker_initiator_tag is not None:
1024
 
            GLib.source_remove(self.checker_initiator_tag)
1025
 
        self.checker_initiator_tag = GLib.timeout_add(
1026
 
            int(self.interval.total_seconds() * 1000),
1027
 
            self.start_checker)
1028
 
        # Schedule a disable() when 'timeout' has passed
1029
 
        if self.disable_initiator_tag is not None:
1030
 
            GLib.source_remove(self.disable_initiator_tag)
1031
 
        self.disable_initiator_tag = GLib.timeout_add(
1032
 
            int(self.timeout.total_seconds() * 1000), self.disable)
 
261
        self.checker_initiator_tag = gobject.timeout_add\
 
262
                                     (self._interval_milliseconds,
 
263
                                      self.start_checker)
1033
264
        # Also start a new checker *right now*.
1034
265
        self.start_checker()
1035
 
 
1036
 
    def checker_callback(self, source, condition, connection,
1037
 
                         command):
 
266
        # Schedule a stop() when 'timeout' has passed
 
267
        self.stop_initiator_tag = gobject.timeout_add\
 
268
                                  (self._timeout_milliseconds,
 
269
                                   self.stop)
 
270
    def stop(self):
 
271
        """Stop this client.
 
272
        The possibility that a client might be restarted is left open,
 
273
        but not currently used."""
 
274
        # If this client doesn't have a secret, it is already stopped.
 
275
        if hasattr(self, "secret") and self.secret:
 
276
            logger.info(u"Stopping client %s", self.name)
 
277
            self.secret = None
 
278
        else:
 
279
            return False
 
280
        if getattr(self, "stop_initiator_tag", False):
 
281
            gobject.source_remove(self.stop_initiator_tag)
 
282
            self.stop_initiator_tag = None
 
283
        if getattr(self, "checker_initiator_tag", False):
 
284
            gobject.source_remove(self.checker_initiator_tag)
 
285
            self.checker_initiator_tag = None
 
286
        self.stop_checker()
 
287
        if self.stop_hook:
 
288
            self.stop_hook(self)
 
289
        # Do not run this again if called by a gobject.timeout_add
 
290
        return False
 
291
    def __del__(self):
 
292
        self.stop_hook = None
 
293
        self.stop()
 
294
    def checker_callback(self, pid, condition):
1038
295
        """The checker has completed, so take appropriate actions."""
1039
 
        # Read return code from connection (see call_pipe)
1040
 
        returncode = connection.recv()
1041
 
        connection.close()
1042
 
        self.checker.join()
 
296
        now = datetime.datetime.now()
1043
297
        self.checker_callback_tag = None
1044
298
        self.checker = None
1045
 
 
1046
 
        if returncode >= 0:
1047
 
            self.last_checker_status = returncode
1048
 
            self.last_checker_signal = None
1049
 
            if self.last_checker_status == 0:
1050
 
                logger.info("Checker for %(name)s succeeded",
1051
 
                            vars(self))
1052
 
                self.checked_ok()
1053
 
            else:
1054
 
                logger.info("Checker for %(name)s failed", vars(self))
1055
 
        else:
1056
 
            self.last_checker_status = -1
1057
 
            self.last_checker_signal = -returncode
1058
 
            logger.warning("Checker for %(name)s crashed?",
 
299
        if os.WIFEXITED(condition) \
 
300
               and (os.WEXITSTATUS(condition) == 0):
 
301
            logger.info(u"Checker for %(name)s succeeded",
 
302
                        vars(self))
 
303
            self.last_checked_ok = now
 
304
            gobject.source_remove(self.stop_initiator_tag)
 
305
            self.stop_initiator_tag = gobject.timeout_add\
 
306
                                      (self._timeout_milliseconds,
 
307
                                       self.stop)
 
308
        elif not os.WIFEXITED(condition):
 
309
            logger.warning(u"Checker for %(name)s crashed?",
1059
310
                           vars(self))
1060
 
        return False
1061
 
 
1062
 
    def checked_ok(self):
1063
 
        """Assert that the client has been seen, alive and well."""
1064
 
        self.last_checked_ok = datetime.datetime.utcnow()
1065
 
        self.last_checker_status = 0
1066
 
        self.last_checker_signal = None
1067
 
        self.bump_timeout()
1068
 
 
1069
 
    def bump_timeout(self, timeout=None):
1070
 
        """Bump up the timeout for this client."""
1071
 
        if timeout is None:
1072
 
            timeout = self.timeout
1073
 
        if self.disable_initiator_tag is not None:
1074
 
            GLib.source_remove(self.disable_initiator_tag)
1075
 
            self.disable_initiator_tag = None
1076
 
        if getattr(self, "enabled", False):
1077
 
            self.disable_initiator_tag = GLib.timeout_add(
1078
 
                int(timeout.total_seconds() * 1000), self.disable)
1079
 
            self.expires = datetime.datetime.utcnow() + timeout
1080
 
 
1081
 
    def need_approval(self):
1082
 
        self.last_approval_request = datetime.datetime.utcnow()
1083
 
 
 
311
        else:
 
312
            logger.info(u"Checker for %(name)s failed",
 
313
                        vars(self))
1084
314
    def start_checker(self):
1085
315
        """Start a new checker subprocess if one is not running.
1086
 
 
1087
316
        If a checker already exists, leave it running and do
1088
317
        nothing."""
1089
318
        # The reason for not killing a running checker is that if we
1090
 
        # did that, and if a checker (for some reason) started running
1091
 
        # slowly and taking more than 'interval' time, then the client
1092
 
        # would inevitably timeout, since no checker would get a
1093
 
        # chance to run to completion.  If we instead leave running
 
319
        # did that, then if a checker (for some reason) started
 
320
        # running slowly and taking more than 'interval' time, the
 
321
        # client would inevitably timeout, since no checker would get
 
322
        # a chance to run to completion.  If we instead leave running
1094
323
        # checkers alone, the checker would have to take more time
1095
 
        # than 'timeout' for the client to be disabled, which is as it
1096
 
        # should be.
1097
 
 
1098
 
        if self.checker is not None and not self.checker.is_alive():
1099
 
            logger.warning("Checker was not alive; joining")
1100
 
            self.checker.join()
1101
 
            self.checker = None
1102
 
        # Start a new checker if needed
 
324
        # than 'timeout' for the client to be declared invalid, which
 
325
        # is as it should be.
1103
326
        if self.checker is None:
1104
 
            # Escape attributes for the shell
1105
 
            escaped_attrs = {
1106
 
                attr: re.escape(str(getattr(self, attr)))
1107
 
                for attr in self.runtime_expansions}
1108
 
            try:
1109
 
                command = self.checker_command % escaped_attrs
1110
 
            except TypeError as error:
1111
 
                logger.error('Could not format string "%s"',
1112
 
                             self.checker_command,
1113
 
                             exc_info=error)
1114
 
                return True     # Try again later
1115
 
            self.current_checker_command = command
1116
 
            logger.info("Starting checker %r for %s", command,
1117
 
                        self.name)
1118
 
            # We don't need to redirect stdout and stderr, since
1119
 
            # in normal mode, that is already done by daemon(),
1120
 
            # and in debug mode we don't want to.  (Stdin is
1121
 
            # always replaced by /dev/null.)
1122
 
            # The exception is when not debugging but nevertheless
1123
 
            # running in the foreground; use the previously
1124
 
            # created wnull.
1125
 
            popen_args = {"close_fds": True,
1126
 
                          "shell": True,
1127
 
                          "cwd": "/"}
1128
 
            if (not self.server_settings["debug"]
1129
 
                and self.server_settings["foreground"]):
1130
 
                popen_args.update({"stdout": wnull,
1131
 
                                   "stderr": wnull})
1132
 
            pipe = multiprocessing.Pipe(duplex=False)
1133
 
            self.checker = multiprocessing.Process(
1134
 
                target=call_pipe,
1135
 
                args=(pipe[1], subprocess.call, command),
1136
 
                kwargs=popen_args)
1137
 
            self.checker.start()
1138
 
            self.checker_callback_tag = GLib.io_add_watch(
1139
 
                pipe[0].fileno(), GLib.IO_IN,
1140
 
                self.checker_callback, pipe[0], command)
1141
 
        # Re-run this periodically if run by GLib.timeout_add
 
327
            try:
 
328
                # In case check_command has exactly one % operator
 
329
                command = self.check_command % self.host
 
330
            except TypeError:
 
331
                # Escape attributes for the shell
 
332
                escaped_attrs = dict((key, re.escape(str(val)))
 
333
                                     for key, val in
 
334
                                     vars(self).iteritems())
 
335
                try:
 
336
                    command = self.check_command % escaped_attrs
 
337
                except TypeError, error:
 
338
                    logger.error(u'Could not format string "%s":'
 
339
                                 u' %s', self.check_command, error)
 
340
                    return True # Try again later
 
341
            try:
 
342
                logger.info(u"Starting checker %r for %s",
 
343
                            command, self.name)
 
344
                # We don't need to redirect stdout and stderr, since
 
345
                # in normal mode, that is already done by daemon(),
 
346
                # and in debug mode we don't want to.  (Stdin is
 
347
                # always replaced by /dev/null.)
 
348
                self.checker = subprocess.Popen(command,
 
349
                                                close_fds=True,
 
350
                                                shell=True, cwd="/")
 
351
                self.checker_callback_tag = gobject.child_watch_add\
 
352
                                            (self.checker.pid,
 
353
                                             self.checker_callback)
 
354
            except OSError, error:
 
355
                logger.error(u"Failed to start subprocess: %s",
 
356
                             error)
 
357
        # Re-run this periodically if run by gobject.timeout_add
1142
358
        return True
1143
 
 
1144
359
    def stop_checker(self):
1145
360
        """Force the checker process, if any, to stop."""
1146
361
        if self.checker_callback_tag:
1147
 
            GLib.source_remove(self.checker_callback_tag)
 
362
            gobject.source_remove(self.checker_callback_tag)
1148
363
            self.checker_callback_tag = None
1149
364
        if getattr(self, "checker", None) is None:
1150
365
            return
1151
 
        logger.debug("Stopping checker for %(name)s", vars(self))
1152
 
        self.checker.terminate()
 
366
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
367
        try:
 
368
            os.kill(self.checker.pid, signal.SIGTERM)
 
369
            #os.sleep(0.5)
 
370
            #if self.checker.poll() is None:
 
371
            #    os.kill(self.checker.pid, signal.SIGKILL)
 
372
        except OSError, error:
 
373
            if error.errno != errno.ESRCH: # No such process
 
374
                raise
1153
375
        self.checker = None
1154
 
 
1155
 
 
1156
 
def dbus_service_property(dbus_interface,
1157
 
                          signature="v",
1158
 
                          access="readwrite",
1159
 
                          byte_arrays=False):
1160
 
    """Decorators for marking methods of a DBusObjectWithProperties to
1161
 
    become properties on the D-Bus.
1162
 
 
1163
 
    The decorated method will be called with no arguments by "Get"
1164
 
    and with one argument by "Set".
1165
 
 
1166
 
    The parameters, where they are supported, are the same as
1167
 
    dbus.service.method, except there is only "signature", since the
1168
 
    type from Get() and the type sent to Set() is the same.
1169
 
    """
1170
 
    # Encoding deeply encoded byte arrays is not supported yet by the
1171
 
    # "Set" method, so we fail early here:
1172
 
    if byte_arrays and signature != "ay":
1173
 
        raise ValueError("Byte arrays not supported for non-'ay'"
1174
 
                         " signature {!r}".format(signature))
1175
 
 
1176
 
    def decorator(func):
1177
 
        func._dbus_is_property = True
1178
 
        func._dbus_interface = dbus_interface
1179
 
        func._dbus_signature = signature
1180
 
        func._dbus_access = access
1181
 
        func._dbus_name = func.__name__
1182
 
        if func._dbus_name.endswith("_dbus_property"):
1183
 
            func._dbus_name = func._dbus_name[:-14]
1184
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays}
1185
 
        return func
1186
 
 
1187
 
    return decorator
1188
 
 
1189
 
 
1190
 
def dbus_interface_annotations(dbus_interface):
1191
 
    """Decorator for marking functions returning interface annotations
1192
 
 
1193
 
    Usage:
1194
 
 
1195
 
    @dbus_interface_annotations("org.example.Interface")
1196
 
    def _foo(self):  # Function name does not matter
1197
 
        return {"org.freedesktop.DBus.Deprecated": "true",
1198
 
                "org.freedesktop.DBus.Property.EmitsChangedSignal":
1199
 
                    "false"}
1200
 
    """
1201
 
 
1202
 
    def decorator(func):
1203
 
        func._dbus_is_interface = True
1204
 
        func._dbus_interface = dbus_interface
1205
 
        func._dbus_name = dbus_interface
1206
 
        return func
1207
 
 
1208
 
    return decorator
1209
 
 
1210
 
 
1211
 
def dbus_annotations(annotations):
1212
 
    """Decorator to annotate D-Bus methods, signals or properties
1213
 
    Usage:
1214
 
 
1215
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true",
1216
 
                       "org.freedesktop.DBus.Property."
1217
 
                       "EmitsChangedSignal": "false"})
1218
 
    @dbus_service_property("org.example.Interface", signature="b",
1219
 
                           access="r")
1220
 
    def Property_dbus_property(self):
1221
 
        return dbus.Boolean(False)
1222
 
 
1223
 
    See also the DBusObjectWithAnnotations class.
1224
 
    """
1225
 
 
1226
 
    def decorator(func):
1227
 
        func._dbus_annotations = annotations
1228
 
        return func
1229
 
 
1230
 
    return decorator
1231
 
 
1232
 
 
1233
 
class DBusPropertyException(dbus.exceptions.DBusException):
1234
 
    """A base class for D-Bus property-related exceptions
1235
 
    """
1236
 
    pass
1237
 
 
1238
 
 
1239
 
class DBusPropertyAccessException(DBusPropertyException):
1240
 
    """A property's access permissions disallows an operation.
1241
 
    """
1242
 
    pass
1243
 
 
1244
 
 
1245
 
class DBusPropertyNotFound(DBusPropertyException):
1246
 
    """An attempt was made to access a non-existing property.
1247
 
    """
1248
 
    pass
1249
 
 
1250
 
 
1251
 
class DBusObjectWithAnnotations(dbus.service.Object):
1252
 
    """A D-Bus object with annotations.
1253
 
 
1254
 
    Classes inheriting from this can use the dbus_annotations
1255
 
    decorator to add annotations to methods or signals.
1256
 
    """
1257
 
 
1258
 
    @staticmethod
1259
 
    def _is_dbus_thing(thing):
1260
 
        """Returns a function testing if an attribute is a D-Bus thing
1261
 
 
1262
 
        If called like _is_dbus_thing("method") it returns a function
1263
 
        suitable for use as predicate to inspect.getmembers().
1264
 
        """
1265
 
        return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),
1266
 
                                   False)
1267
 
 
1268
 
    def _get_all_dbus_things(self, thing):
1269
 
        """Returns a generator of (name, attribute) pairs
1270
 
        """
1271
 
        return ((getattr(athing.__get__(self), "_dbus_name", name),
1272
 
                 athing.__get__(self))
1273
 
                for cls in self.__class__.__mro__
1274
 
                for name, athing in
1275
 
                inspect.getmembers(cls, self._is_dbus_thing(thing)))
1276
 
 
1277
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1278
 
                         out_signature="s",
1279
 
                         path_keyword='object_path',
1280
 
                         connection_keyword='connection')
1281
 
    def Introspect(self, object_path, connection):
1282
 
        """Overloading of standard D-Bus method.
1283
 
 
1284
 
        Inserts annotation tags on methods and signals.
1285
 
        """
1286
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
1287
 
                                                   connection)
1288
 
        try:
1289
 
            document = xml.dom.minidom.parseString(xmlstring)
1290
 
 
1291
 
            for if_tag in document.getElementsByTagName("interface"):
1292
 
                # Add annotation tags
1293
 
                for typ in ("method", "signal"):
1294
 
                    for tag in if_tag.getElementsByTagName(typ):
1295
 
                        annots = dict()
1296
 
                        for name, prop in (self.
1297
 
                                           _get_all_dbus_things(typ)):
1298
 
                            if (name == tag.getAttribute("name")
1299
 
                                and prop._dbus_interface
1300
 
                                == if_tag.getAttribute("name")):
1301
 
                                annots.update(getattr(
1302
 
                                    prop, "_dbus_annotations", {}))
1303
 
                        for name, value in annots.items():
1304
 
                            ann_tag = document.createElement(
1305
 
                                "annotation")
1306
 
                            ann_tag.setAttribute("name", name)
1307
 
                            ann_tag.setAttribute("value", value)
1308
 
                            tag.appendChild(ann_tag)
1309
 
                # Add interface annotation tags
1310
 
                for annotation, value in dict(
1311
 
                    itertools.chain.from_iterable(
1312
 
                        annotations().items()
1313
 
                        for name, annotations
1314
 
                        in self._get_all_dbus_things("interface")
1315
 
                        if name == if_tag.getAttribute("name")
1316
 
                        )).items():
1317
 
                    ann_tag = document.createElement("annotation")
1318
 
                    ann_tag.setAttribute("name", annotation)
1319
 
                    ann_tag.setAttribute("value", value)
1320
 
                    if_tag.appendChild(ann_tag)
1321
 
                # Fix argument name for the Introspect method itself
1322
 
                if (if_tag.getAttribute("name")
1323
 
                    == dbus.INTROSPECTABLE_IFACE):
1324
 
                    for cn in if_tag.getElementsByTagName("method"):
1325
 
                        if cn.getAttribute("name") == "Introspect":
1326
 
                            for arg in cn.getElementsByTagName("arg"):
1327
 
                                if (arg.getAttribute("direction")
1328
 
                                    == "out"):
1329
 
                                    arg.setAttribute("name",
1330
 
                                                     "xml_data")
1331
 
            xmlstring = document.toxml("utf-8")
1332
 
            document.unlink()
1333
 
        except (AttributeError, xml.dom.DOMException,
1334
 
                xml.parsers.expat.ExpatError) as error:
1335
 
            logger.error("Failed to override Introspection method",
1336
 
                         exc_info=error)
1337
 
        return xmlstring
1338
 
 
1339
 
 
1340
 
class DBusObjectWithProperties(DBusObjectWithAnnotations):
1341
 
    """A D-Bus object with properties.
1342
 
 
1343
 
    Classes inheriting from this can use the dbus_service_property
1344
 
    decorator to expose methods as D-Bus properties.  It exposes the
1345
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
1346
 
    """
1347
 
 
1348
 
    def _get_dbus_property(self, interface_name, property_name):
1349
 
        """Returns a bound method if one exists which is a D-Bus
1350
 
        property with the specified name and interface.
1351
 
        """
1352
 
        for cls in self.__class__.__mro__:
1353
 
            for name, value in inspect.getmembers(
1354
 
                    cls, self._is_dbus_thing("property")):
1355
 
                if (value._dbus_name == property_name
1356
 
                    and value._dbus_interface == interface_name):
1357
 
                    return value.__get__(self)
1358
 
 
1359
 
        # No such property
1360
 
        raise DBusPropertyNotFound("{}:{}.{}".format(
1361
 
            self.dbus_object_path, interface_name, property_name))
1362
 
 
1363
 
    @classmethod
1364
 
    def _get_all_interface_names(cls):
1365
 
        """Get a sequence of all interfaces supported by an object"""
1366
 
        return (name for name in set(getattr(getattr(x, attr),
1367
 
                                             "_dbus_interface", None)
1368
 
                                     for x in (inspect.getmro(cls))
1369
 
                                     for attr in dir(x))
1370
 
                if name is not None)
1371
 
 
1372
 
    @dbus.service.method(dbus.PROPERTIES_IFACE,
1373
 
                         in_signature="ss",
1374
 
                         out_signature="v")
1375
 
    def Get(self, interface_name, property_name):
1376
 
        """Standard D-Bus property Get() method, see D-Bus standard.
1377
 
        """
1378
 
        prop = self._get_dbus_property(interface_name, property_name)
1379
 
        if prop._dbus_access == "write":
1380
 
            raise DBusPropertyAccessException(property_name)
1381
 
        value = prop()
1382
 
        if not hasattr(value, "variant_level"):
1383
 
            return value
1384
 
        return type(value)(value, variant_level=value.variant_level+1)
1385
 
 
1386
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
1387
 
    def Set(self, interface_name, property_name, value):
1388
 
        """Standard D-Bus property Set() method, see D-Bus standard.
1389
 
        """
1390
 
        prop = self._get_dbus_property(interface_name, property_name)
1391
 
        if prop._dbus_access == "read":
1392
 
            raise DBusPropertyAccessException(property_name)
1393
 
        if prop._dbus_get_args_options["byte_arrays"]:
1394
 
            # The byte_arrays option is not supported yet on
1395
 
            # signatures other than "ay".
1396
 
            if prop._dbus_signature != "ay":
1397
 
                raise ValueError("Byte arrays not supported for non-"
1398
 
                                 "'ay' signature {!r}"
1399
 
                                 .format(prop._dbus_signature))
1400
 
            value = dbus.ByteArray(b''.join(chr(byte)
1401
 
                                            for byte in value))
1402
 
        prop(value)
1403
 
 
1404
 
    @dbus.service.method(dbus.PROPERTIES_IFACE,
1405
 
                         in_signature="s",
1406
 
                         out_signature="a{sv}")
1407
 
    def GetAll(self, interface_name):
1408
 
        """Standard D-Bus property GetAll() method, see D-Bus
1409
 
        standard.
1410
 
 
1411
 
        Note: Will not include properties with access="write".
1412
 
        """
1413
 
        properties = {}
1414
 
        for name, prop in self._get_all_dbus_things("property"):
1415
 
            if (interface_name
1416
 
                and interface_name != prop._dbus_interface):
1417
 
                # Interface non-empty but did not match
1418
 
                continue
1419
 
            # Ignore write-only properties
1420
 
            if prop._dbus_access == "write":
1421
 
                continue
1422
 
            value = prop()
1423
 
            if not hasattr(value, "variant_level"):
1424
 
                properties[name] = value
1425
 
                continue
1426
 
            properties[name] = type(value)(
1427
 
                value, variant_level=value.variant_level + 1)
1428
 
        return dbus.Dictionary(properties, signature="sv")
1429
 
 
1430
 
    @dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")
1431
 
    def PropertiesChanged(self, interface_name, changed_properties,
1432
 
                          invalidated_properties):
1433
 
        """Standard D-Bus PropertiesChanged() signal, see D-Bus
1434
 
        standard.
1435
 
        """
1436
 
        pass
1437
 
 
1438
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1439
 
                         out_signature="s",
1440
 
                         path_keyword='object_path',
1441
 
                         connection_keyword='connection')
1442
 
    def Introspect(self, object_path, connection):
1443
 
        """Overloading of standard D-Bus method.
1444
 
 
1445
 
        Inserts property tags and interface annotation tags.
1446
 
        """
1447
 
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
1448
 
                                                         object_path,
1449
 
                                                         connection)
1450
 
        try:
1451
 
            document = xml.dom.minidom.parseString(xmlstring)
1452
 
 
1453
 
            def make_tag(document, name, prop):
1454
 
                e = document.createElement("property")
1455
 
                e.setAttribute("name", name)
1456
 
                e.setAttribute("type", prop._dbus_signature)
1457
 
                e.setAttribute("access", prop._dbus_access)
1458
 
                return e
1459
 
 
1460
 
            for if_tag in document.getElementsByTagName("interface"):
1461
 
                # Add property tags
1462
 
                for tag in (make_tag(document, name, prop)
1463
 
                            for name, prop
1464
 
                            in self._get_all_dbus_things("property")
1465
 
                            if prop._dbus_interface
1466
 
                            == if_tag.getAttribute("name")):
1467
 
                    if_tag.appendChild(tag)
1468
 
                # Add annotation tags for properties
1469
 
                for tag in if_tag.getElementsByTagName("property"):
1470
 
                    annots = dict()
1471
 
                    for name, prop in self._get_all_dbus_things(
1472
 
                            "property"):
1473
 
                        if (name == tag.getAttribute("name")
1474
 
                            and prop._dbus_interface
1475
 
                            == if_tag.getAttribute("name")):
1476
 
                            annots.update(getattr(
1477
 
                                prop, "_dbus_annotations", {}))
1478
 
                    for name, value in annots.items():
1479
 
                        ann_tag = document.createElement(
1480
 
                            "annotation")
1481
 
                        ann_tag.setAttribute("name", name)
1482
 
                        ann_tag.setAttribute("value", value)
1483
 
                        tag.appendChild(ann_tag)
1484
 
                # Add the names to the return values for the
1485
 
                # "org.freedesktop.DBus.Properties" methods
1486
 
                if (if_tag.getAttribute("name")
1487
 
                    == "org.freedesktop.DBus.Properties"):
1488
 
                    for cn in if_tag.getElementsByTagName("method"):
1489
 
                        if cn.getAttribute("name") == "Get":
1490
 
                            for arg in cn.getElementsByTagName("arg"):
1491
 
                                if (arg.getAttribute("direction")
1492
 
                                    == "out"):
1493
 
                                    arg.setAttribute("name", "value")
1494
 
                        elif cn.getAttribute("name") == "GetAll":
1495
 
                            for arg in cn.getElementsByTagName("arg"):
1496
 
                                if (arg.getAttribute("direction")
1497
 
                                    == "out"):
1498
 
                                    arg.setAttribute("name", "props")
1499
 
            xmlstring = document.toxml("utf-8")
1500
 
            document.unlink()
1501
 
        except (AttributeError, xml.dom.DOMException,
1502
 
                xml.parsers.expat.ExpatError) as error:
1503
 
            logger.error("Failed to override Introspection method",
1504
 
                         exc_info=error)
1505
 
        return xmlstring
1506
 
 
1507
 
 
1508
 
try:
1509
 
    dbus.OBJECT_MANAGER_IFACE
1510
 
except AttributeError:
1511
 
    dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"
1512
 
 
1513
 
 
1514
 
class DBusObjectWithObjectManager(DBusObjectWithAnnotations):
1515
 
    """A D-Bus object with an ObjectManager.
1516
 
 
1517
 
    Classes inheriting from this exposes the standard
1518
 
    GetManagedObjects call and the InterfacesAdded and
1519
 
    InterfacesRemoved signals on the standard
1520
 
    "org.freedesktop.DBus.ObjectManager" interface.
1521
 
 
1522
 
    Note: No signals are sent automatically; they must be sent
1523
 
    manually.
1524
 
    """
1525
 
    @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
1526
 
                         out_signature="a{oa{sa{sv}}}")
1527
 
    def GetManagedObjects(self):
1528
 
        """This function must be overridden"""
1529
 
        raise NotImplementedError()
1530
 
 
1531
 
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,
1532
 
                         signature="oa{sa{sv}}")
1533
 
    def InterfacesAdded(self, object_path, interfaces_and_properties):
1534
 
        pass
1535
 
 
1536
 
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature="oas")
1537
 
    def InterfacesRemoved(self, object_path, interfaces):
1538
 
        pass
1539
 
 
1540
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1541
 
                         out_signature="s",
1542
 
                         path_keyword='object_path',
1543
 
                         connection_keyword='connection')
1544
 
    def Introspect(self, object_path, connection):
1545
 
        """Overloading of standard D-Bus method.
1546
 
 
1547
 
        Override return argument name of GetManagedObjects to be
1548
 
        "objpath_interfaces_and_properties"
1549
 
        """
1550
 
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
1551
 
                                                         object_path,
1552
 
                                                         connection)
1553
 
        try:
1554
 
            document = xml.dom.minidom.parseString(xmlstring)
1555
 
 
1556
 
            for if_tag in document.getElementsByTagName("interface"):
1557
 
                # Fix argument name for the GetManagedObjects method
1558
 
                if (if_tag.getAttribute("name")
1559
 
                    == dbus.OBJECT_MANAGER_IFACE):
1560
 
                    for cn in if_tag.getElementsByTagName("method"):
1561
 
                        if (cn.getAttribute("name")
1562
 
                            == "GetManagedObjects"):
1563
 
                            for arg in cn.getElementsByTagName("arg"):
1564
 
                                if (arg.getAttribute("direction")
1565
 
                                    == "out"):
1566
 
                                    arg.setAttribute(
1567
 
                                        "name",
1568
 
                                        "objpath_interfaces"
1569
 
                                        "_and_properties")
1570
 
            xmlstring = document.toxml("utf-8")
1571
 
            document.unlink()
1572
 
        except (AttributeError, xml.dom.DOMException,
1573
 
                xml.parsers.expat.ExpatError) as error:
1574
 
            logger.error("Failed to override Introspection method",
1575
 
                         exc_info=error)
1576
 
        return xmlstring
1577
 
 
1578
 
 
1579
 
def datetime_to_dbus(dt, variant_level=0):
1580
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
1581
 
    if dt is None:
1582
 
        return dbus.String("", variant_level=variant_level)
1583
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
1584
 
 
1585
 
 
1586
 
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
1587
 
    """A class decorator; applied to a subclass of
1588
 
    dbus.service.Object, it will add alternate D-Bus attributes with
1589
 
    interface names according to the "alt_interface_names" mapping.
1590
 
    Usage:
1591
 
 
1592
 
    @alternate_dbus_interfaces({"org.example.Interface":
1593
 
                                    "net.example.AlternateInterface"})
1594
 
    class SampleDBusObject(dbus.service.Object):
1595
 
        @dbus.service.method("org.example.Interface")
1596
 
        def SampleDBusMethod():
1597
 
            pass
1598
 
 
1599
 
    The above "SampleDBusMethod" on "SampleDBusObject" will be
1600
 
    reachable via two interfaces: "org.example.Interface" and
1601
 
    "net.example.AlternateInterface", the latter of which will have
1602
 
    its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
1603
 
    "true", unless "deprecate" is passed with a False value.
1604
 
 
1605
 
    This works for methods and signals, and also for D-Bus properties
1606
 
    (from DBusObjectWithProperties) and interfaces (from the
1607
 
    dbus_interface_annotations decorator).
1608
 
    """
1609
 
 
1610
 
    def wrapper(cls):
1611
 
        for orig_interface_name, alt_interface_name in (
1612
 
                alt_interface_names.items()):
1613
 
            attr = {}
1614
 
            interface_names = set()
1615
 
            # Go though all attributes of the class
1616
 
            for attrname, attribute in inspect.getmembers(cls):
1617
 
                # Ignore non-D-Bus attributes, and D-Bus attributes
1618
 
                # with the wrong interface name
1619
 
                if (not hasattr(attribute, "_dbus_interface")
1620
 
                    or not attribute._dbus_interface.startswith(
1621
 
                        orig_interface_name)):
1622
 
                    continue
1623
 
                # Create an alternate D-Bus interface name based on
1624
 
                # the current name
1625
 
                alt_interface = attribute._dbus_interface.replace(
1626
 
                    orig_interface_name, alt_interface_name)
1627
 
                interface_names.add(alt_interface)
1628
 
                # Is this a D-Bus signal?
1629
 
                if getattr(attribute, "_dbus_is_signal", False):
1630
 
                    # Extract the original non-method undecorated
1631
 
                    # function by black magic
1632
 
                    if sys.version_info.major == 2:
1633
 
                        nonmethod_func = (dict(
1634
 
                            zip(attribute.func_code.co_freevars,
1635
 
                                attribute.__closure__))
1636
 
                                          ["func"].cell_contents)
1637
 
                    else:
1638
 
                        nonmethod_func = (dict(
1639
 
                            zip(attribute.__code__.co_freevars,
1640
 
                                attribute.__closure__))
1641
 
                                          ["func"].cell_contents)
1642
 
                    # Create a new, but exactly alike, function
1643
 
                    # object, and decorate it to be a new D-Bus signal
1644
 
                    # with the alternate D-Bus interface name
1645
 
                    new_function = copy_function(nonmethod_func)
1646
 
                    new_function = (dbus.service.signal(
1647
 
                        alt_interface,
1648
 
                        attribute._dbus_signature)(new_function))
1649
 
                    # Copy annotations, if any
1650
 
                    try:
1651
 
                        new_function._dbus_annotations = dict(
1652
 
                            attribute._dbus_annotations)
1653
 
                    except AttributeError:
1654
 
                        pass
1655
 
 
1656
 
                    # Define a creator of a function to call both the
1657
 
                    # original and alternate functions, so both the
1658
 
                    # original and alternate signals gets sent when
1659
 
                    # the function is called
1660
 
                    def fixscope(func1, func2):
1661
 
                        """This function is a scope container to pass
1662
 
                        func1 and func2 to the "call_both" function
1663
 
                        outside of its arguments"""
1664
 
 
1665
 
                        @functools.wraps(func2)
1666
 
                        def call_both(*args, **kwargs):
1667
 
                            """This function will emit two D-Bus
1668
 
                            signals by calling func1 and func2"""
1669
 
                            func1(*args, **kwargs)
1670
 
                            func2(*args, **kwargs)
1671
 
                        # Make wrapper function look like a D-Bus
1672
 
                        # signal
1673
 
                        for name, attr in inspect.getmembers(func2):
1674
 
                            if name.startswith("_dbus_"):
1675
 
                                setattr(call_both, name, attr)
1676
 
 
1677
 
                        return call_both
1678
 
                    # Create the "call_both" function and add it to
1679
 
                    # the class
1680
 
                    attr[attrname] = fixscope(attribute, new_function)
1681
 
                # Is this a D-Bus method?
1682
 
                elif getattr(attribute, "_dbus_is_method", False):
1683
 
                    # Create a new, but exactly alike, function
1684
 
                    # object.  Decorate it to be a new D-Bus method
1685
 
                    # with the alternate D-Bus interface name.  Add it
1686
 
                    # to the class.
1687
 
                    attr[attrname] = (
1688
 
                        dbus.service.method(
1689
 
                            alt_interface,
1690
 
                            attribute._dbus_in_signature,
1691
 
                            attribute._dbus_out_signature)
1692
 
                        (copy_function(attribute)))
1693
 
                    # Copy annotations, if any
1694
 
                    try:
1695
 
                        attr[attrname]._dbus_annotations = dict(
1696
 
                            attribute._dbus_annotations)
1697
 
                    except AttributeError:
1698
 
                        pass
1699
 
                # Is this a D-Bus property?
1700
 
                elif getattr(attribute, "_dbus_is_property", False):
1701
 
                    # Create a new, but exactly alike, function
1702
 
                    # object, and decorate it to be a new D-Bus
1703
 
                    # property with the alternate D-Bus interface
1704
 
                    # name.  Add it to the class.
1705
 
                    attr[attrname] = (dbus_service_property(
1706
 
                        alt_interface, attribute._dbus_signature,
1707
 
                        attribute._dbus_access,
1708
 
                        attribute._dbus_get_args_options
1709
 
                        ["byte_arrays"])
1710
 
                                      (copy_function(attribute)))
1711
 
                    # Copy annotations, if any
1712
 
                    try:
1713
 
                        attr[attrname]._dbus_annotations = dict(
1714
 
                            attribute._dbus_annotations)
1715
 
                    except AttributeError:
1716
 
                        pass
1717
 
                # Is this a D-Bus interface?
1718
 
                elif getattr(attribute, "_dbus_is_interface", False):
1719
 
                    # Create a new, but exactly alike, function
1720
 
                    # object.  Decorate it to be a new D-Bus interface
1721
 
                    # with the alternate D-Bus interface name.  Add it
1722
 
                    # to the class.
1723
 
                    attr[attrname] = (
1724
 
                        dbus_interface_annotations(alt_interface)
1725
 
                        (copy_function(attribute)))
1726
 
            if deprecate:
1727
 
                # Deprecate all alternate interfaces
1728
 
                iname = "_AlternateDBusNames_interface_annotation{}"
1729
 
                for interface_name in interface_names:
1730
 
 
1731
 
                    @dbus_interface_annotations(interface_name)
1732
 
                    def func(self):
1733
 
                        return {"org.freedesktop.DBus.Deprecated":
1734
 
                                "true"}
1735
 
                    # Find an unused name
1736
 
                    for aname in (iname.format(i)
1737
 
                                  for i in itertools.count()):
1738
 
                        if aname not in attr:
1739
 
                            attr[aname] = func
1740
 
                            break
1741
 
            if interface_names:
1742
 
                # Replace the class with a new subclass of it with
1743
 
                # methods, signals, etc. as created above.
1744
 
                if sys.version_info.major == 2:
1745
 
                    cls = type(b"{}Alternate".format(cls.__name__),
1746
 
                               (cls, ), attr)
1747
 
                else:
1748
 
                    cls = type("{}Alternate".format(cls.__name__),
1749
 
                               (cls, ), attr)
1750
 
        return cls
1751
 
 
1752
 
    return wrapper
1753
 
 
1754
 
 
1755
 
@alternate_dbus_interfaces({"se.recompile.Mandos":
1756
 
                            "se.bsnet.fukt.Mandos"})
1757
 
class ClientDBus(Client, DBusObjectWithProperties):
1758
 
    """A Client class using D-Bus
1759
 
 
1760
 
    Attributes:
1761
 
    dbus_object_path: dbus.ObjectPath
1762
 
    bus: dbus.SystemBus()
1763
 
    """
1764
 
 
1765
 
    runtime_expansions = (Client.runtime_expansions
1766
 
                          + ("dbus_object_path", ))
1767
 
 
1768
 
    _interface = "se.recompile.Mandos.Client"
1769
 
 
1770
 
    # dbus.service.Object doesn't use super(), so we can't either.
1771
 
 
1772
 
    def __init__(self, bus=None, *args, **kwargs):
1773
 
        self.bus = bus
1774
 
        Client.__init__(self, *args, **kwargs)
1775
 
        # Only now, when this client is initialized, can it show up on
1776
 
        # the D-Bus
1777
 
        client_object_name = str(self.name).translate(
1778
 
            {ord("."): ord("_"),
1779
 
             ord("-"): ord("_")})
1780
 
        self.dbus_object_path = dbus.ObjectPath(
1781
 
            "/clients/" + client_object_name)
1782
 
        DBusObjectWithProperties.__init__(self, self.bus,
1783
 
                                          self.dbus_object_path)
1784
 
 
1785
 
    def notifychangeproperty(transform_func, dbus_name,
1786
 
                             type_func=lambda x: x,
1787
 
                             variant_level=1,
1788
 
                             invalidate_only=False,
1789
 
                             _interface=_interface):
1790
 
        """ Modify a variable so that it's a property which announces
1791
 
        its changes to DBus.
1792
 
 
1793
 
        transform_fun: Function that takes a value and a variant_level
1794
 
                       and transforms it to a D-Bus type.
1795
 
        dbus_name: D-Bus name of the variable
1796
 
        type_func: Function that transform the value before sending it
1797
 
                   to the D-Bus.  Default: no transform
1798
 
        variant_level: D-Bus variant level.  Default: 1
1799
 
        """
1800
 
        attrname = "_{}".format(dbus_name)
1801
 
 
1802
 
        def setter(self, value):
1803
 
            if hasattr(self, "dbus_object_path"):
1804
 
                if (not hasattr(self, attrname) or
1805
 
                    type_func(getattr(self, attrname, None))
1806
 
                    != type_func(value)):
1807
 
                    if invalidate_only:
1808
 
                        self.PropertiesChanged(
1809
 
                            _interface, dbus.Dictionary(),
1810
 
                            dbus.Array((dbus_name, )))
1811
 
                    else:
1812
 
                        dbus_value = transform_func(
1813
 
                            type_func(value),
1814
 
                            variant_level=variant_level)
1815
 
                        self.PropertyChanged(dbus.String(dbus_name),
1816
 
                                             dbus_value)
1817
 
                        self.PropertiesChanged(
1818
 
                            _interface,
1819
 
                            dbus.Dictionary({dbus.String(dbus_name):
1820
 
                                             dbus_value}),
1821
 
                            dbus.Array())
1822
 
            setattr(self, attrname, value)
1823
 
 
1824
 
        return property(lambda self: getattr(self, attrname), setter)
1825
 
 
1826
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
1827
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
1828
 
                                             "ApprovalPending",
1829
 
                                             type_func=bool)
1830
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1831
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
1832
 
                                        "LastEnabled")
1833
 
    checker = notifychangeproperty(
1834
 
        dbus.Boolean, "CheckerRunning",
1835
 
        type_func=lambda checker: checker is not None)
1836
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
1837
 
                                           "LastCheckedOK")
1838
 
    last_checker_status = notifychangeproperty(dbus.Int16,
1839
 
                                               "LastCheckerStatus")
1840
 
    last_approval_request = notifychangeproperty(
1841
 
        datetime_to_dbus, "LastApprovalRequest")
1842
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
1843
 
                                               "ApprovedByDefault")
1844
 
    approval_delay = notifychangeproperty(
1845
 
        dbus.UInt64, "ApprovalDelay",
1846
 
        type_func=lambda td: td.total_seconds() * 1000)
1847
 
    approval_duration = notifychangeproperty(
1848
 
        dbus.UInt64, "ApprovalDuration",
1849
 
        type_func=lambda td: td.total_seconds() * 1000)
1850
 
    host = notifychangeproperty(dbus.String, "Host")
1851
 
    timeout = notifychangeproperty(
1852
 
        dbus.UInt64, "Timeout",
1853
 
        type_func=lambda td: td.total_seconds() * 1000)
1854
 
    extended_timeout = notifychangeproperty(
1855
 
        dbus.UInt64, "ExtendedTimeout",
1856
 
        type_func=lambda td: td.total_seconds() * 1000)
1857
 
    interval = notifychangeproperty(
1858
 
        dbus.UInt64, "Interval",
1859
 
        type_func=lambda td: td.total_seconds() * 1000)
1860
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
1861
 
    secret = notifychangeproperty(dbus.ByteArray, "Secret",
1862
 
                                  invalidate_only=True)
1863
 
 
1864
 
    del notifychangeproperty
1865
 
 
1866
 
    def __del__(self, *args, **kwargs):
1867
 
        try:
1868
 
            self.remove_from_connection()
1869
 
        except LookupError:
1870
 
            pass
1871
 
        if hasattr(DBusObjectWithProperties, "__del__"):
1872
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
1873
 
        Client.__del__(self, *args, **kwargs)
1874
 
 
1875
 
    def checker_callback(self, source, condition,
1876
 
                         connection, command, *args, **kwargs):
1877
 
        ret = Client.checker_callback(self, source, condition,
1878
 
                                      connection, command, *args,
1879
 
                                      **kwargs)
1880
 
        exitstatus = self.last_checker_status
1881
 
        if exitstatus >= 0:
1882
 
            # Emit D-Bus signal
1883
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
1884
 
                                  # This is specific to GNU libC
1885
 
                                  dbus.Int64(exitstatus << 8),
1886
 
                                  dbus.String(command))
1887
 
        else:
1888
 
            # Emit D-Bus signal
1889
 
            self.CheckerCompleted(dbus.Int16(-1),
1890
 
                                  dbus.Int64(
1891
 
                                      # This is specific to GNU libC
1892
 
                                      (exitstatus << 8)
1893
 
                                      | self.last_checker_signal),
1894
 
                                  dbus.String(command))
1895
 
        return ret
1896
 
 
1897
 
    def start_checker(self, *args, **kwargs):
1898
 
        old_checker_pid = getattr(self.checker, "pid", None)
1899
 
        r = Client.start_checker(self, *args, **kwargs)
1900
 
        # Only if new checker process was started
1901
 
        if (self.checker is not None
1902
 
            and old_checker_pid != self.checker.pid):
1903
 
            # Emit D-Bus signal
1904
 
            self.CheckerStarted(self.current_checker_command)
1905
 
        return r
1906
 
 
1907
 
    def _reset_approved(self):
1908
 
        self.approved = None
1909
 
        return False
1910
 
 
1911
 
    def approve(self, value=True):
1912
 
        self.approved = value
1913
 
        GLib.timeout_add(int(self.approval_duration.total_seconds()
1914
 
                             * 1000), self._reset_approved)
1915
 
        self.send_changedstate()
1916
 
 
1917
 
    #  D-Bus methods, signals & properties
1918
 
 
1919
 
    #  Interfaces
1920
 
 
1921
 
    #  Signals
1922
 
 
1923
 
    # CheckerCompleted - signal
1924
 
    @dbus.service.signal(_interface, signature="nxs")
1925
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
1926
 
        "D-Bus signal"
1927
 
        pass
1928
 
 
1929
 
    # CheckerStarted - signal
1930
 
    @dbus.service.signal(_interface, signature="s")
1931
 
    def CheckerStarted(self, command):
1932
 
        "D-Bus signal"
1933
 
        pass
1934
 
 
1935
 
    # PropertyChanged - signal
1936
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1937
 
    @dbus.service.signal(_interface, signature="sv")
1938
 
    def PropertyChanged(self, property, value):
1939
 
        "D-Bus signal"
1940
 
        pass
1941
 
 
1942
 
    # GotSecret - signal
1943
 
    @dbus.service.signal(_interface)
1944
 
    def GotSecret(self):
1945
 
        """D-Bus signal
1946
 
        Is sent after a successful transfer of secret from the Mandos
1947
 
        server to mandos-client
1948
 
        """
1949
 
        pass
1950
 
 
1951
 
    # Rejected - signal
1952
 
    @dbus.service.signal(_interface, signature="s")
1953
 
    def Rejected(self, reason):
1954
 
        "D-Bus signal"
1955
 
        pass
1956
 
 
1957
 
    # NeedApproval - signal
1958
 
    @dbus.service.signal(_interface, signature="tb")
1959
 
    def NeedApproval(self, timeout, default):
1960
 
        "D-Bus signal"
1961
 
        return self.need_approval()
1962
 
 
1963
 
    #  Methods
1964
 
 
1965
 
    # Approve - method
1966
 
    @dbus.service.method(_interface, in_signature="b")
1967
 
    def Approve(self, value):
1968
 
        self.approve(value)
1969
 
 
1970
 
    # CheckedOK - method
1971
 
    @dbus.service.method(_interface)
1972
 
    def CheckedOK(self):
1973
 
        self.checked_ok()
1974
 
 
1975
 
    # Enable - method
1976
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1977
 
    @dbus.service.method(_interface)
1978
 
    def Enable(self):
1979
 
        "D-Bus method"
1980
 
        self.enable()
1981
 
 
1982
 
    # StartChecker - method
1983
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1984
 
    @dbus.service.method(_interface)
1985
 
    def StartChecker(self):
1986
 
        "D-Bus method"
1987
 
        self.start_checker()
1988
 
 
1989
 
    # Disable - method
1990
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1991
 
    @dbus.service.method(_interface)
1992
 
    def Disable(self):
1993
 
        "D-Bus method"
1994
 
        self.disable()
1995
 
 
1996
 
    # StopChecker - method
1997
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1998
 
    @dbus.service.method(_interface)
1999
 
    def StopChecker(self):
2000
 
        self.stop_checker()
2001
 
 
2002
 
    #  Properties
2003
 
 
2004
 
    # ApprovalPending - property
2005
 
    @dbus_service_property(_interface, signature="b", access="read")
2006
 
    def ApprovalPending_dbus_property(self):
2007
 
        return dbus.Boolean(bool(self.approvals_pending))
2008
 
 
2009
 
    # ApprovedByDefault - property
2010
 
    @dbus_service_property(_interface,
2011
 
                           signature="b",
2012
 
                           access="readwrite")
2013
 
    def ApprovedByDefault_dbus_property(self, value=None):
2014
 
        if value is None:       # get
2015
 
            return dbus.Boolean(self.approved_by_default)
2016
 
        self.approved_by_default = bool(value)
2017
 
 
2018
 
    # ApprovalDelay - property
2019
 
    @dbus_service_property(_interface,
2020
 
                           signature="t",
2021
 
                           access="readwrite")
2022
 
    def ApprovalDelay_dbus_property(self, value=None):
2023
 
        if value is None:       # get
2024
 
            return dbus.UInt64(self.approval_delay.total_seconds()
2025
 
                               * 1000)
2026
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
2027
 
 
2028
 
    # ApprovalDuration - property
2029
 
    @dbus_service_property(_interface,
2030
 
                           signature="t",
2031
 
                           access="readwrite")
2032
 
    def ApprovalDuration_dbus_property(self, value=None):
2033
 
        if value is None:       # get
2034
 
            return dbus.UInt64(self.approval_duration.total_seconds()
2035
 
                               * 1000)
2036
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
2037
 
 
2038
 
    # Name - property
2039
 
    @dbus_annotations(
2040
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2041
 
    @dbus_service_property(_interface, signature="s", access="read")
2042
 
    def Name_dbus_property(self):
2043
 
        return dbus.String(self.name)
2044
 
 
2045
 
    # KeyID - property
2046
 
    @dbus_annotations(
2047
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2048
 
    @dbus_service_property(_interface, signature="s", access="read")
2049
 
    def KeyID_dbus_property(self):
2050
 
        return dbus.String(self.key_id)
2051
 
 
2052
 
    # Fingerprint - property
2053
 
    @dbus_annotations(
2054
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2055
 
    @dbus_service_property(_interface, signature="s", access="read")
2056
 
    def Fingerprint_dbus_property(self):
2057
 
        return dbus.String(self.fingerprint)
2058
 
 
2059
 
    # Host - property
2060
 
    @dbus_service_property(_interface,
2061
 
                           signature="s",
2062
 
                           access="readwrite")
2063
 
    def Host_dbus_property(self, value=None):
2064
 
        if value is None:       # get
2065
 
            return dbus.String(self.host)
2066
 
        self.host = str(value)
2067
 
 
2068
 
    # Created - property
2069
 
    @dbus_annotations(
2070
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2071
 
    @dbus_service_property(_interface, signature="s", access="read")
2072
 
    def Created_dbus_property(self):
2073
 
        return datetime_to_dbus(self.created)
2074
 
 
2075
 
    # LastEnabled - property
2076
 
    @dbus_service_property(_interface, signature="s", access="read")
2077
 
    def LastEnabled_dbus_property(self):
2078
 
        return datetime_to_dbus(self.last_enabled)
2079
 
 
2080
 
    # Enabled - property
2081
 
    @dbus_service_property(_interface,
2082
 
                           signature="b",
2083
 
                           access="readwrite")
2084
 
    def Enabled_dbus_property(self, value=None):
2085
 
        if value is None:       # get
2086
 
            return dbus.Boolean(self.enabled)
2087
 
        if value:
2088
 
            self.enable()
2089
 
        else:
2090
 
            self.disable()
2091
 
 
2092
 
    # LastCheckedOK - property
2093
 
    @dbus_service_property(_interface,
2094
 
                           signature="s",
2095
 
                           access="readwrite")
2096
 
    def LastCheckedOK_dbus_property(self, value=None):
2097
 
        if value is not None:
2098
 
            self.checked_ok()
2099
 
            return
2100
 
        return datetime_to_dbus(self.last_checked_ok)
2101
 
 
2102
 
    # LastCheckerStatus - property
2103
 
    @dbus_service_property(_interface, signature="n", access="read")
2104
 
    def LastCheckerStatus_dbus_property(self):
2105
 
        return dbus.Int16(self.last_checker_status)
2106
 
 
2107
 
    # Expires - property
2108
 
    @dbus_service_property(_interface, signature="s", access="read")
2109
 
    def Expires_dbus_property(self):
2110
 
        return datetime_to_dbus(self.expires)
2111
 
 
2112
 
    # LastApprovalRequest - property
2113
 
    @dbus_service_property(_interface, signature="s", access="read")
2114
 
    def LastApprovalRequest_dbus_property(self):
2115
 
        return datetime_to_dbus(self.last_approval_request)
2116
 
 
2117
 
    # Timeout - property
2118
 
    @dbus_service_property(_interface,
2119
 
                           signature="t",
2120
 
                           access="readwrite")
2121
 
    def Timeout_dbus_property(self, value=None):
2122
 
        if value is None:       # get
2123
 
            return dbus.UInt64(self.timeout.total_seconds() * 1000)
2124
 
        old_timeout = self.timeout
2125
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
2126
 
        # Reschedule disabling
2127
 
        if self.enabled:
2128
 
            now = datetime.datetime.utcnow()
2129
 
            self.expires += self.timeout - old_timeout
2130
 
            if self.expires <= now:
2131
 
                # The timeout has passed
2132
 
                self.disable()
2133
 
            else:
2134
 
                if (getattr(self, "disable_initiator_tag", None)
2135
 
                    is None):
2136
 
                    return
2137
 
                GLib.source_remove(self.disable_initiator_tag)
2138
 
                self.disable_initiator_tag = GLib.timeout_add(
2139
 
                    int((self.expires - now).total_seconds() * 1000),
2140
 
                    self.disable)
2141
 
 
2142
 
    # ExtendedTimeout - property
2143
 
    @dbus_service_property(_interface,
2144
 
                           signature="t",
2145
 
                           access="readwrite")
2146
 
    def ExtendedTimeout_dbus_property(self, value=None):
2147
 
        if value is None:       # get
2148
 
            return dbus.UInt64(self.extended_timeout.total_seconds()
2149
 
                               * 1000)
2150
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
2151
 
 
2152
 
    # Interval - property
2153
 
    @dbus_service_property(_interface,
2154
 
                           signature="t",
2155
 
                           access="readwrite")
2156
 
    def Interval_dbus_property(self, value=None):
2157
 
        if value is None:       # get
2158
 
            return dbus.UInt64(self.interval.total_seconds() * 1000)
2159
 
        self.interval = datetime.timedelta(0, 0, 0, value)
2160
 
        if getattr(self, "checker_initiator_tag", None) is None:
2161
 
            return
2162
 
        if self.enabled:
2163
 
            # Reschedule checker run
2164
 
            GLib.source_remove(self.checker_initiator_tag)
2165
 
            self.checker_initiator_tag = GLib.timeout_add(
2166
 
                value, self.start_checker)
2167
 
            self.start_checker()  # Start one now, too
2168
 
 
2169
 
    # Checker - property
2170
 
    @dbus_service_property(_interface,
2171
 
                           signature="s",
2172
 
                           access="readwrite")
2173
 
    def Checker_dbus_property(self, value=None):
2174
 
        if value is None:       # get
2175
 
            return dbus.String(self.checker_command)
2176
 
        self.checker_command = str(value)
2177
 
 
2178
 
    # CheckerRunning - property
2179
 
    @dbus_service_property(_interface,
2180
 
                           signature="b",
2181
 
                           access="readwrite")
2182
 
    def CheckerRunning_dbus_property(self, value=None):
2183
 
        if value is None:       # get
2184
 
            return dbus.Boolean(self.checker is not None)
2185
 
        if value:
2186
 
            self.start_checker()
2187
 
        else:
2188
 
            self.stop_checker()
2189
 
 
2190
 
    # ObjectPath - property
2191
 
    @dbus_annotations(
2192
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",
2193
 
         "org.freedesktop.DBus.Deprecated": "true"})
2194
 
    @dbus_service_property(_interface, signature="o", access="read")
2195
 
    def ObjectPath_dbus_property(self):
2196
 
        return self.dbus_object_path  # is already a dbus.ObjectPath
2197
 
 
2198
 
    # Secret = property
2199
 
    @dbus_annotations(
2200
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal":
2201
 
         "invalidates"})
2202
 
    @dbus_service_property(_interface,
2203
 
                           signature="ay",
2204
 
                           access="write",
2205
 
                           byte_arrays=True)
2206
 
    def Secret_dbus_property(self, value):
2207
 
        self.secret = bytes(value)
2208
 
 
2209
 
    del _interface
2210
 
 
2211
 
 
2212
 
class ProxyClient(object):
2213
 
    def __init__(self, child_pipe, key_id, fpr, address):
2214
 
        self._pipe = child_pipe
2215
 
        self._pipe.send(('init', key_id, fpr, address))
2216
 
        if not self._pipe.recv():
2217
 
            raise KeyError(key_id or fpr)
2218
 
 
2219
 
    def __getattribute__(self, name):
2220
 
        if name == '_pipe':
2221
 
            return super(ProxyClient, self).__getattribute__(name)
2222
 
        self._pipe.send(('getattr', name))
2223
 
        data = self._pipe.recv()
2224
 
        if data[0] == 'data':
2225
 
            return data[1]
2226
 
        if data[0] == 'function':
2227
 
 
2228
 
            def func(*args, **kwargs):
2229
 
                self._pipe.send(('funcall', name, args, kwargs))
2230
 
                return self._pipe.recv()[1]
2231
 
 
2232
 
            return func
2233
 
 
2234
 
    def __setattr__(self, name, value):
2235
 
        if name == '_pipe':
2236
 
            return super(ProxyClient, self).__setattr__(name, value)
2237
 
        self._pipe.send(('setattr', name, value))
2238
 
 
2239
 
 
2240
 
class ClientHandler(socketserver.BaseRequestHandler, object):
2241
 
    """A class to handle client connections.
2242
 
 
2243
 
    Instantiated once for each connection to handle it.
 
376
    def still_valid(self):
 
377
        """Has the timeout not yet passed for this client?"""
 
378
        now = datetime.datetime.now()
 
379
        if self.last_checked_ok is None:
 
380
            return now < (self.created + self.timeout)
 
381
        else:
 
382
            return now < (self.last_checked_ok + self.timeout)
 
383
 
 
384
 
 
385
def peer_certificate(session):
 
386
    "Return the peer's OpenPGP certificate as a bytestring"
 
387
    # If not an OpenPGP certificate...
 
388
    if gnutls.library.functions.gnutls_certificate_type_get\
 
389
            (session._c_object) \
 
390
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
391
        # ...do the normal thing
 
392
        return session.peer_certificate
 
393
    list_size = ctypes.c_uint()
 
394
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
395
        (session._c_object, ctypes.byref(list_size))
 
396
    if list_size.value == 0:
 
397
        return None
 
398
    cert = cert_list[0]
 
399
    return ctypes.string_at(cert.data, cert.size)
 
400
 
 
401
 
 
402
def fingerprint(openpgp):
 
403
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
404
    # New GnuTLS "datum" with the OpenPGP public key
 
405
    datum = gnutls.library.types.gnutls_datum_t\
 
406
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
407
                     ctypes.POINTER(ctypes.c_ubyte)),
 
408
         ctypes.c_uint(len(openpgp)))
 
409
    # New empty GnuTLS certificate
 
410
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
411
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
412
        (ctypes.byref(crt))
 
413
    # Import the OpenPGP public key into the certificate
 
414
    gnutls.library.functions.gnutls_openpgp_crt_import\
 
415
                    (crt, ctypes.byref(datum),
 
416
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
417
    # Verify the self signature in the key
 
418
    crtverify = ctypes.c_uint();
 
419
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
 
420
        (crt, 0, ctypes.byref(crtverify))
 
421
    if crtverify.value != 0:
 
422
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
423
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
424
    # New buffer for the fingerprint
 
425
    buffer = ctypes.create_string_buffer(20)
 
426
    buffer_length = ctypes.c_size_t()
 
427
    # Get the fingerprint from the certificate into the buffer
 
428
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
429
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
430
    # Deinit the certificate
 
431
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
432
    # Convert the buffer to a Python bytestring
 
433
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
434
    # Convert the bytestring to hexadecimal notation
 
435
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
436
    return hex_fpr
 
437
 
 
438
 
 
439
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
440
    """A TCP request handler class.
 
441
    Instantiated by IPv6_TCPServer for each request to handle it.
2244
442
    Note: This will run in its own forked process."""
2245
 
 
 
443
    
2246
444
    def handle(self):
2247
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
2248
 
            logger.info("TCP connection from: %s",
2249
 
                        str(self.client_address))
2250
 
            logger.debug("Pipe FD: %d",
2251
 
                         self.server.child_pipe.fileno())
2252
 
 
2253
 
            session = gnutls.ClientSession(self.request)
2254
 
 
2255
 
            # priority = ':'.join(("NONE", "+VERS-TLS1.1",
2256
 
            #                       "+AES-256-CBC", "+SHA1",
2257
 
            #                       "+COMP-NULL", "+CTYPE-OPENPGP",
2258
 
            #                       "+DHE-DSS"))
2259
 
            # Use a fallback default, since this MUST be set.
2260
 
            priority = self.server.gnutls_priority
2261
 
            if priority is None:
2262
 
                priority = "NORMAL"
2263
 
            gnutls.priority_set_direct(session._c_object,
2264
 
                                       priority.encode("utf-8"),
2265
 
                                       None)
2266
 
 
2267
 
            # Start communication using the Mandos protocol
2268
 
            # Get protocol number
2269
 
            line = self.request.makefile().readline()
2270
 
            logger.debug("Protocol version: %r", line)
2271
 
            try:
2272
 
                if int(line.strip().split()[0]) > 1:
2273
 
                    raise RuntimeError(line)
2274
 
            except (ValueError, IndexError, RuntimeError) as error:
2275
 
                logger.error("Unknown protocol version: %s", error)
2276
 
                return
2277
 
 
2278
 
            # Start GnuTLS connection
2279
 
            try:
2280
 
                session.handshake()
2281
 
            except gnutls.Error as error:
2282
 
                logger.warning("Handshake failed: %s", error)
2283
 
                # Do not run session.bye() here: the session is not
2284
 
                # established.  Just abandon the request.
2285
 
                return
2286
 
            logger.debug("Handshake succeeded")
2287
 
 
2288
 
            approval_required = False
2289
 
            try:
2290
 
                if gnutls.has_rawpk:
2291
 
                    fpr = b""
2292
 
                    try:
2293
 
                        key_id = self.key_id(
2294
 
                            self.peer_certificate(session))
2295
 
                    except (TypeError, gnutls.Error) as error:
2296
 
                        logger.warning("Bad certificate: %s", error)
2297
 
                        return
2298
 
                    logger.debug("Key ID: %s", key_id)
2299
 
 
2300
 
                else:
2301
 
                    key_id = b""
2302
 
                    try:
2303
 
                        fpr = self.fingerprint(
2304
 
                            self.peer_certificate(session))
2305
 
                    except (TypeError, gnutls.Error) as error:
2306
 
                        logger.warning("Bad certificate: %s", error)
2307
 
                        return
2308
 
                    logger.debug("Fingerprint: %s", fpr)
2309
 
 
2310
 
                try:
2311
 
                    client = ProxyClient(child_pipe, key_id, fpr,
2312
 
                                         self.client_address)
2313
 
                except KeyError:
2314
 
                    return
2315
 
 
2316
 
                if client.approval_delay:
2317
 
                    delay = client.approval_delay
2318
 
                    client.approvals_pending += 1
2319
 
                    approval_required = True
2320
 
 
2321
 
                while True:
2322
 
                    if not client.enabled:
2323
 
                        logger.info("Client %s is disabled",
2324
 
                                    client.name)
2325
 
                        if self.server.use_dbus:
2326
 
                            # Emit D-Bus signal
2327
 
                            client.Rejected("Disabled")
2328
 
                        return
2329
 
 
2330
 
                    if client.approved or not client.approval_delay:
2331
 
                        # We are approved or approval is disabled
2332
 
                        break
2333
 
                    elif client.approved is None:
2334
 
                        logger.info("Client %s needs approval",
2335
 
                                    client.name)
2336
 
                        if self.server.use_dbus:
2337
 
                            # Emit D-Bus signal
2338
 
                            client.NeedApproval(
2339
 
                                client.approval_delay.total_seconds()
2340
 
                                * 1000, client.approved_by_default)
2341
 
                    else:
2342
 
                        logger.warning("Client %s was not approved",
2343
 
                                       client.name)
2344
 
                        if self.server.use_dbus:
2345
 
                            # Emit D-Bus signal
2346
 
                            client.Rejected("Denied")
2347
 
                        return
2348
 
 
2349
 
                    # wait until timeout or approved
2350
 
                    time = datetime.datetime.now()
2351
 
                    client.changedstate.acquire()
2352
 
                    client.changedstate.wait(delay.total_seconds())
2353
 
                    client.changedstate.release()
2354
 
                    time2 = datetime.datetime.now()
2355
 
                    if (time2 - time) >= delay:
2356
 
                        if not client.approved_by_default:
2357
 
                            logger.warning("Client %s timed out while"
2358
 
                                           " waiting for approval",
2359
 
                                           client.name)
2360
 
                            if self.server.use_dbus:
2361
 
                                # Emit D-Bus signal
2362
 
                                client.Rejected("Approval timed out")
2363
 
                            return
2364
 
                        else:
2365
 
                            break
2366
 
                    else:
2367
 
                        delay -= time2 - time
2368
 
 
2369
 
                try:
2370
 
                    session.send(client.secret)
2371
 
                except gnutls.Error as error:
2372
 
                    logger.warning("gnutls send failed",
2373
 
                                   exc_info=error)
2374
 
                    return
2375
 
 
2376
 
                logger.info("Sending secret to %s", client.name)
2377
 
                # bump the timeout using extended_timeout
2378
 
                client.bump_timeout(client.extended_timeout)
2379
 
                if self.server.use_dbus:
2380
 
                    # Emit D-Bus signal
2381
 
                    client.GotSecret()
2382
 
 
2383
 
            finally:
2384
 
                if approval_required:
2385
 
                    client.approvals_pending -= 1
2386
 
                try:
2387
 
                    session.bye()
2388
 
                except gnutls.Error as error:
2389
 
                    logger.warning("GnuTLS bye failed",
2390
 
                                   exc_info=error)
2391
 
 
2392
 
    @staticmethod
2393
 
    def peer_certificate(session):
2394
 
        "Return the peer's certificate as a bytestring"
2395
 
        try:
2396
 
            cert_type = gnutls.certificate_type_get2(session._c_object,
2397
 
                                                     gnutls.CTYPE_PEERS)
2398
 
        except AttributeError:
2399
 
            cert_type = gnutls.certificate_type_get(session._c_object)
2400
 
        if gnutls.has_rawpk:
2401
 
            valid_cert_types = frozenset((gnutls.CRT_RAWPK,))
2402
 
        else:
2403
 
            valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))
2404
 
        # If not a valid certificate type...
2405
 
        if cert_type not in valid_cert_types:
2406
 
            logger.info("Cert type %r not in %r", cert_type,
2407
 
                        valid_cert_types)
2408
 
            # ...return invalid data
2409
 
            return b""
2410
 
        list_size = ctypes.c_uint(1)
2411
 
        cert_list = (gnutls.certificate_get_peers
2412
 
                     (session._c_object, ctypes.byref(list_size)))
2413
 
        if not bool(cert_list) and list_size.value != 0:
2414
 
            raise gnutls.Error("error getting peer certificate")
2415
 
        if list_size.value == 0:
2416
 
            return None
2417
 
        cert = cert_list[0]
2418
 
        return ctypes.string_at(cert.data, cert.size)
2419
 
 
2420
 
    @staticmethod
2421
 
    def key_id(certificate):
2422
 
        "Convert a certificate bytestring to a hexdigit key ID"
2423
 
        # New GnuTLS "datum" with the public key
2424
 
        datum = gnutls.datum_t(
2425
 
            ctypes.cast(ctypes.c_char_p(certificate),
2426
 
                        ctypes.POINTER(ctypes.c_ubyte)),
2427
 
            ctypes.c_uint(len(certificate)))
2428
 
        # XXX all these need to be created in the gnutls "module"
2429
 
        # New empty GnuTLS certificate
2430
 
        pubkey = gnutls.pubkey_t()
2431
 
        gnutls.pubkey_init(ctypes.byref(pubkey))
2432
 
        # Import the raw public key into the certificate
2433
 
        gnutls.pubkey_import(pubkey,
2434
 
                             ctypes.byref(datum),
2435
 
                             gnutls.X509_FMT_DER)
2436
 
        # New buffer for the key ID
2437
 
        buf = ctypes.create_string_buffer(32)
2438
 
        buf_len = ctypes.c_size_t(len(buf))
2439
 
        # Get the key ID from the raw public key into the buffer
2440
 
        gnutls.pubkey_get_key_id(pubkey,
2441
 
                                 gnutls.KEYID_USE_SHA256,
2442
 
                                 ctypes.cast(ctypes.byref(buf),
2443
 
                                             ctypes.POINTER(ctypes.c_ubyte)),
2444
 
                                 ctypes.byref(buf_len))
2445
 
        # Deinit the certificate
2446
 
        gnutls.pubkey_deinit(pubkey)
2447
 
 
2448
 
        # Convert the buffer to a Python bytestring
2449
 
        key_id = ctypes.string_at(buf, buf_len.value)
2450
 
        # Convert the bytestring to hexadecimal notation
2451
 
        hex_key_id = binascii.hexlify(key_id).upper()
2452
 
        return hex_key_id
2453
 
 
2454
 
    @staticmethod
2455
 
    def fingerprint(openpgp):
2456
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
2457
 
        # New GnuTLS "datum" with the OpenPGP public key
2458
 
        datum = gnutls.datum_t(
2459
 
            ctypes.cast(ctypes.c_char_p(openpgp),
2460
 
                        ctypes.POINTER(ctypes.c_ubyte)),
2461
 
            ctypes.c_uint(len(openpgp)))
2462
 
        # New empty GnuTLS certificate
2463
 
        crt = gnutls.openpgp_crt_t()
2464
 
        gnutls.openpgp_crt_init(ctypes.byref(crt))
2465
 
        # Import the OpenPGP public key into the certificate
2466
 
        gnutls.openpgp_crt_import(crt, ctypes.byref(datum),
2467
 
                                  gnutls.OPENPGP_FMT_RAW)
2468
 
        # Verify the self signature in the key
2469
 
        crtverify = ctypes.c_uint()
2470
 
        gnutls.openpgp_crt_verify_self(crt, 0,
2471
 
                                       ctypes.byref(crtverify))
2472
 
        if crtverify.value != 0:
2473
 
            gnutls.openpgp_crt_deinit(crt)
2474
 
            raise gnutls.CertificateSecurityError(code
2475
 
                                                  =crtverify.value)
2476
 
        # New buffer for the fingerprint
2477
 
        buf = ctypes.create_string_buffer(20)
2478
 
        buf_len = ctypes.c_size_t()
2479
 
        # Get the fingerprint from the certificate into the buffer
2480
 
        gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
2481
 
                                           ctypes.byref(buf_len))
2482
 
        # Deinit the certificate
2483
 
        gnutls.openpgp_crt_deinit(crt)
2484
 
        # Convert the buffer to a Python bytestring
2485
 
        fpr = ctypes.string_at(buf, buf_len.value)
2486
 
        # Convert the bytestring to hexadecimal notation
2487
 
        hex_fpr = binascii.hexlify(fpr).upper()
2488
 
        return hex_fpr
2489
 
 
2490
 
 
2491
 
class MultiprocessingMixIn(object):
2492
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
2493
 
 
2494
 
    def sub_process_main(self, request, address):
2495
 
        try:
2496
 
            self.finish_request(request, address)
2497
 
        except Exception:
2498
 
            self.handle_error(request, address)
2499
 
        self.close_request(request)
2500
 
 
2501
 
    def process_request(self, request, address):
2502
 
        """Start a new process to process the request."""
2503
 
        proc = multiprocessing.Process(target=self.sub_process_main,
2504
 
                                       args=(request, address))
2505
 
        proc.start()
2506
 
        return proc
2507
 
 
2508
 
 
2509
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
2510
 
    """ adds a pipe to the MixIn """
2511
 
 
2512
 
    def process_request(self, request, client_address):
2513
 
        """Overrides and wraps the original process_request().
2514
 
 
2515
 
        This function creates a new pipe in self.pipe
2516
 
        """
2517
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
2518
 
 
2519
 
        proc = MultiprocessingMixIn.process_request(self, request,
2520
 
                                                    client_address)
2521
 
        self.child_pipe.close()
2522
 
        self.add_pipe(parent_pipe, proc)
2523
 
 
2524
 
    def add_pipe(self, parent_pipe, proc):
2525
 
        """Dummy function; override as necessary"""
2526
 
        raise NotImplementedError()
2527
 
 
2528
 
 
2529
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
2530
 
                     socketserver.TCPServer, object):
2531
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
2532
 
 
 
445
        logger.info(u"TCP connection from: %s",
 
446
                     unicode(self.client_address))
 
447
        session = gnutls.connection.ClientSession\
 
448
                  (self.request, gnutls.connection.X509Credentials())
 
449
        
 
450
        line = self.request.makefile().readline()
 
451
        logger.debug(u"Protocol version: %r", line)
 
452
        try:
 
453
            if int(line.strip().split()[0]) > 1:
 
454
                raise RuntimeError
 
455
        except (ValueError, IndexError, RuntimeError), error:
 
456
            logger.error(u"Unknown protocol version: %s", error)
 
457
            return
 
458
        
 
459
        # Note: gnutls.connection.X509Credentials is really a generic
 
460
        # GnuTLS certificate credentials object so long as no X.509
 
461
        # keys are added to it.  Therefore, we can use it here despite
 
462
        # using OpenPGP certificates.
 
463
        
 
464
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
465
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
466
        #                "+DHE-DSS"))
 
467
        priority = "NORMAL"             # Fallback default, since this
 
468
                                        # MUST be set.
 
469
        if self.server.settings["priority"]:
 
470
            priority = self.server.settings["priority"]
 
471
        gnutls.library.functions.gnutls_priority_set_direct\
 
472
            (session._c_object, priority, None);
 
473
        
 
474
        try:
 
475
            session.handshake()
 
476
        except gnutls.errors.GNUTLSError, error:
 
477
            logger.warning(u"Handshake failed: %s", error)
 
478
            # Do not run session.bye() here: the session is not
 
479
            # established.  Just abandon the request.
 
480
            return
 
481
        try:
 
482
            fpr = fingerprint(peer_certificate(session))
 
483
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
484
            logger.warning(u"Bad certificate: %s", error)
 
485
            session.bye()
 
486
            return
 
487
        logger.debug(u"Fingerprint: %s", fpr)
 
488
        client = None
 
489
        for c in self.server.clients:
 
490
            if c.fingerprint == fpr:
 
491
                client = c
 
492
                break
 
493
        if not client:
 
494
            logger.warning(u"Client not found for fingerprint: %s",
 
495
                           fpr)
 
496
            session.bye()
 
497
            return
 
498
        # Have to check if client.still_valid(), since it is possible
 
499
        # that the client timed out while establishing the GnuTLS
 
500
        # session.
 
501
        if not client.still_valid():
 
502
            logger.warning(u"Client %(name)s is invalid",
 
503
                           vars(client))
 
504
            session.bye()
 
505
            return
 
506
        sent_size = 0
 
507
        while sent_size < len(client.secret):
 
508
            sent = session.send(client.secret[sent_size:])
 
509
            logger.debug(u"Sent: %d, remaining: %d",
 
510
                         sent, len(client.secret)
 
511
                         - (sent_size + sent))
 
512
            sent_size += sent
 
513
        session.bye()
 
514
 
 
515
 
 
516
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
517
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
2533
518
    Attributes:
 
519
        settings:       Server settings
 
520
        clients:        Set() of Client objects
2534
521
        enabled:        Boolean; whether this server is activated yet
2535
 
        interface:      None or a network interface name (string)
2536
 
        use_ipv6:       Boolean; to use IPv6 or not
2537
522
    """
2538
 
 
2539
 
    def __init__(self, server_address, RequestHandlerClass,
2540
 
                 interface=None,
2541
 
                 use_ipv6=True,
2542
 
                 socketfd=None):
2543
 
        """If socketfd is set, use that file descriptor instead of
2544
 
        creating a new one with socket.socket().
2545
 
        """
2546
 
        self.interface = interface
2547
 
        if use_ipv6:
2548
 
            self.address_family = socket.AF_INET6
2549
 
        if socketfd is not None:
2550
 
            # Save the file descriptor
2551
 
            self.socketfd = socketfd
2552
 
            # Save the original socket.socket() function
2553
 
            self.socket_socket = socket.socket
2554
 
 
2555
 
            # To implement --socket, we monkey patch socket.socket.
2556
 
            #
2557
 
            # (When socketserver.TCPServer is a new-style class, we
2558
 
            # could make self.socket into a property instead of monkey
2559
 
            # patching socket.socket.)
2560
 
            #
2561
 
            # Create a one-time-only replacement for socket.socket()
2562
 
            @functools.wraps(socket.socket)
2563
 
            def socket_wrapper(*args, **kwargs):
2564
 
                # Restore original function so subsequent calls are
2565
 
                # not affected.
2566
 
                socket.socket = self.socket_socket
2567
 
                del self.socket_socket
2568
 
                # This time only, return a new socket object from the
2569
 
                # saved file descriptor.
2570
 
                return socket.fromfd(self.socketfd, *args, **kwargs)
2571
 
            # Replace socket.socket() function with wrapper
2572
 
            socket.socket = socket_wrapper
2573
 
        # The socketserver.TCPServer.__init__ will call
2574
 
        # socket.socket(), which might be our replacement,
2575
 
        # socket_wrapper(), if socketfd was set.
2576
 
        socketserver.TCPServer.__init__(self, server_address,
2577
 
                                        RequestHandlerClass)
2578
 
 
 
523
    address_family = socket.AF_INET6
 
524
    def __init__(self, *args, **kwargs):
 
525
        if "settings" in kwargs:
 
526
            self.settings = kwargs["settings"]
 
527
            del kwargs["settings"]
 
528
        if "clients" in kwargs:
 
529
            self.clients = kwargs["clients"]
 
530
            del kwargs["clients"]
 
531
        self.enabled = False
 
532
        return super(type(self), self).__init__(*args, **kwargs)
2579
533
    def server_bind(self):
2580
534
        """This overrides the normal server_bind() function
2581
535
        to bind to an interface if one was specified, and also NOT to
2582
536
        bind to an address or port if they were not specified."""
2583
 
        global SO_BINDTODEVICE
2584
 
        if self.interface is not None:
2585
 
            if SO_BINDTODEVICE is None:
2586
 
                # Fall back to a hard-coded value which seems to be
2587
 
                # common enough.
2588
 
                logger.warning("SO_BINDTODEVICE not found, trying 25")
2589
 
                SO_BINDTODEVICE = 25
 
537
        if self.settings["interface"]:
 
538
            # 25 is from /usr/include/asm-i486/socket.h
 
539
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
2590
540
            try:
2591
 
                self.socket.setsockopt(
2592
 
                    socket.SOL_SOCKET, SO_BINDTODEVICE,
2593
 
                    (self.interface + "\0").encode("utf-8"))
2594
 
            except socket.error as error:
2595
 
                if error.errno == errno.EPERM:
2596
 
                    logger.error("No permission to bind to"
2597
 
                                 " interface %s", self.interface)
2598
 
                elif error.errno == errno.ENOPROTOOPT:
2599
 
                    logger.error("SO_BINDTODEVICE not available;"
2600
 
                                 " cannot bind to interface %s",
2601
 
                                 self.interface)
2602
 
                elif error.errno == errno.ENODEV:
2603
 
                    logger.error("Interface %s does not exist,"
2604
 
                                 " cannot bind", self.interface)
 
541
                self.socket.setsockopt(socket.SOL_SOCKET,
 
542
                                       SO_BINDTODEVICE,
 
543
                                       self.settings["interface"])
 
544
            except socket.error, error:
 
545
                if error[0] == errno.EPERM:
 
546
                    logger.error(u"No permission to"
 
547
                                 u" bind to interface %s",
 
548
                                 self.settings["interface"])
2605
549
                else:
2606
 
                    raise
 
550
                    raise error
2607
551
        # Only bind(2) the socket if we really need to.
2608
552
        if self.server_address[0] or self.server_address[1]:
2609
 
            if self.server_address[1]:
2610
 
                self.allow_reuse_address = True
2611
553
            if not self.server_address[0]:
2612
 
                if self.address_family == socket.AF_INET6:
2613
 
                    any_address = "::"  # in6addr_any
2614
 
                else:
2615
 
                    any_address = "0.0.0.0"  # INADDR_ANY
2616
 
                self.server_address = (any_address,
 
554
                in6addr_any = "::"
 
555
                self.server_address = (in6addr_any,
2617
556
                                       self.server_address[1])
2618
557
            elif not self.server_address[1]:
2619
 
                self.server_address = (self.server_address[0], 0)
2620
 
#                 if self.interface:
 
558
                self.server_address = (self.server_address[0],
 
559
                                       0)
 
560
#                 if self.settings["interface"]:
2621
561
#                     self.server_address = (self.server_address[0],
2622
562
#                                            0, # port
2623
563
#                                            0, # flowinfo
2624
564
#                                            if_nametoindex
2625
 
#                                            (self.interface))
2626
 
            return socketserver.TCPServer.server_bind(self)
2627
 
 
2628
 
 
2629
 
class MandosServer(IPv6_TCPServer):
2630
 
    """Mandos server.
2631
 
 
2632
 
    Attributes:
2633
 
        clients:        set of Client objects
2634
 
        gnutls_priority GnuTLS priority string
2635
 
        use_dbus:       Boolean; to emit D-Bus signals or not
2636
 
 
2637
 
    Assumes a GLib.MainLoop event loop.
2638
 
    """
2639
 
 
2640
 
    def __init__(self, server_address, RequestHandlerClass,
2641
 
                 interface=None,
2642
 
                 use_ipv6=True,
2643
 
                 clients=None,
2644
 
                 gnutls_priority=None,
2645
 
                 use_dbus=True,
2646
 
                 socketfd=None):
2647
 
        self.enabled = False
2648
 
        self.clients = clients
2649
 
        if self.clients is None:
2650
 
            self.clients = {}
2651
 
        self.use_dbus = use_dbus
2652
 
        self.gnutls_priority = gnutls_priority
2653
 
        IPv6_TCPServer.__init__(self, server_address,
2654
 
                                RequestHandlerClass,
2655
 
                                interface=interface,
2656
 
                                use_ipv6=use_ipv6,
2657
 
                                socketfd=socketfd)
2658
 
 
 
565
#                                            (self.settings
 
566
#                                             ["interface"]))
 
567
            return super(type(self), self).server_bind()
2659
568
    def server_activate(self):
2660
569
        if self.enabled:
2661
 
            return socketserver.TCPServer.server_activate(self)
2662
 
 
 
570
            return super(type(self), self).server_activate()
2663
571
    def enable(self):
2664
572
        self.enabled = True
2665
573
 
2666
 
    def add_pipe(self, parent_pipe, proc):
2667
 
        # Call "handle_ipc" for both data and EOF events
2668
 
        GLib.io_add_watch(
2669
 
            parent_pipe.fileno(),
2670
 
            GLib.IO_IN | GLib.IO_HUP,
2671
 
            functools.partial(self.handle_ipc,
2672
 
                              parent_pipe=parent_pipe,
2673
 
                              proc=proc))
2674
 
 
2675
 
    def handle_ipc(self, source, condition,
2676
 
                   parent_pipe=None,
2677
 
                   proc=None,
2678
 
                   client_object=None):
2679
 
        # error, or the other end of multiprocessing.Pipe has closed
2680
 
        if condition & (GLib.IO_ERR | GLib.IO_HUP):
2681
 
            # Wait for other process to exit
2682
 
            proc.join()
2683
 
            return False
2684
 
 
2685
 
        # Read a request from the child
2686
 
        request = parent_pipe.recv()
2687
 
        command = request[0]
2688
 
 
2689
 
        if command == 'init':
2690
 
            key_id = request[1].decode("ascii")
2691
 
            fpr = request[2].decode("ascii")
2692
 
            address = request[3]
2693
 
 
2694
 
            for c in self.clients.values():
2695
 
                if key_id == "E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855":
2696
 
                    continue
2697
 
                if key_id and c.key_id == key_id:
2698
 
                    client = c
2699
 
                    break
2700
 
                if fpr and c.fingerprint == fpr:
2701
 
                    client = c
2702
 
                    break
2703
 
            else:
2704
 
                logger.info("Client not found for key ID: %s, address"
2705
 
                            ": %s", key_id or fpr, address)
2706
 
                if self.use_dbus:
2707
 
                    # Emit D-Bus signal
2708
 
                    mandos_dbus_service.ClientNotFound(key_id or fpr,
2709
 
                                                       address[0])
2710
 
                parent_pipe.send(False)
2711
 
                return False
2712
 
 
2713
 
            GLib.io_add_watch(
2714
 
                parent_pipe.fileno(),
2715
 
                GLib.IO_IN | GLib.IO_HUP,
2716
 
                functools.partial(self.handle_ipc,
2717
 
                                  parent_pipe=parent_pipe,
2718
 
                                  proc=proc,
2719
 
                                  client_object=client))
2720
 
            parent_pipe.send(True)
2721
 
            # remove the old hook in favor of the new above hook on
2722
 
            # same fileno
2723
 
            return False
2724
 
        if command == 'funcall':
2725
 
            funcname = request[1]
2726
 
            args = request[2]
2727
 
            kwargs = request[3]
2728
 
 
2729
 
            parent_pipe.send(('data', getattr(client_object,
2730
 
                                              funcname)(*args,
2731
 
                                                        **kwargs)))
2732
 
 
2733
 
        if command == 'getattr':
2734
 
            attrname = request[1]
2735
 
            if isinstance(client_object.__getattribute__(attrname),
2736
 
                          collections.Callable):
2737
 
                parent_pipe.send(('function', ))
2738
 
            else:
2739
 
                parent_pipe.send((
2740
 
                    'data', client_object.__getattribute__(attrname)))
2741
 
 
2742
 
        if command == 'setattr':
2743
 
            attrname = request[1]
2744
 
            value = request[2]
2745
 
            setattr(client_object, attrname, value)
2746
 
 
2747
 
        return True
2748
 
 
2749
 
 
2750
 
def rfc3339_duration_to_delta(duration):
2751
 
    """Parse an RFC 3339 "duration" and return a datetime.timedelta
2752
 
 
2753
 
    >>> rfc3339_duration_to_delta("P7D")
2754
 
    datetime.timedelta(7)
2755
 
    >>> rfc3339_duration_to_delta("PT60S")
2756
 
    datetime.timedelta(0, 60)
2757
 
    >>> rfc3339_duration_to_delta("PT60M")
2758
 
    datetime.timedelta(0, 3600)
2759
 
    >>> rfc3339_duration_to_delta("PT24H")
2760
 
    datetime.timedelta(1)
2761
 
    >>> rfc3339_duration_to_delta("P1W")
2762
 
    datetime.timedelta(7)
2763
 
    >>> rfc3339_duration_to_delta("PT5M30S")
2764
 
    datetime.timedelta(0, 330)
2765
 
    >>> rfc3339_duration_to_delta("P1DT3M20S")
2766
 
    datetime.timedelta(1, 200)
2767
 
    """
2768
 
 
2769
 
    # Parsing an RFC 3339 duration with regular expressions is not
2770
 
    # possible - there would have to be multiple places for the same
2771
 
    # values, like seconds.  The current code, while more esoteric, is
2772
 
    # cleaner without depending on a parsing library.  If Python had a
2773
 
    # built-in library for parsing we would use it, but we'd like to
2774
 
    # avoid excessive use of external libraries.
2775
 
 
2776
 
    # New type for defining tokens, syntax, and semantics all-in-one
2777
 
    Token = collections.namedtuple("Token", (
2778
 
        "regexp",  # To match token; if "value" is not None, must have
2779
 
                   # a "group" containing digits
2780
 
        "value",   # datetime.timedelta or None
2781
 
        "followers"))           # Tokens valid after this token
2782
 
    # RFC 3339 "duration" tokens, syntax, and semantics; taken from
2783
 
    # the "duration" ABNF definition in RFC 3339, Appendix A.
2784
 
    token_end = Token(re.compile(r"$"), None, frozenset())
2785
 
    token_second = Token(re.compile(r"(\d+)S"),
2786
 
                         datetime.timedelta(seconds=1),
2787
 
                         frozenset((token_end, )))
2788
 
    token_minute = Token(re.compile(r"(\d+)M"),
2789
 
                         datetime.timedelta(minutes=1),
2790
 
                         frozenset((token_second, token_end)))
2791
 
    token_hour = Token(re.compile(r"(\d+)H"),
2792
 
                       datetime.timedelta(hours=1),
2793
 
                       frozenset((token_minute, token_end)))
2794
 
    token_time = Token(re.compile(r"T"),
2795
 
                       None,
2796
 
                       frozenset((token_hour, token_minute,
2797
 
                                  token_second)))
2798
 
    token_day = Token(re.compile(r"(\d+)D"),
2799
 
                      datetime.timedelta(days=1),
2800
 
                      frozenset((token_time, token_end)))
2801
 
    token_month = Token(re.compile(r"(\d+)M"),
2802
 
                        datetime.timedelta(weeks=4),
2803
 
                        frozenset((token_day, token_end)))
2804
 
    token_year = Token(re.compile(r"(\d+)Y"),
2805
 
                       datetime.timedelta(weeks=52),
2806
 
                       frozenset((token_month, token_end)))
2807
 
    token_week = Token(re.compile(r"(\d+)W"),
2808
 
                       datetime.timedelta(weeks=1),
2809
 
                       frozenset((token_end, )))
2810
 
    token_duration = Token(re.compile(r"P"), None,
2811
 
                           frozenset((token_year, token_month,
2812
 
                                      token_day, token_time,
2813
 
                                      token_week)))
2814
 
    # Define starting values:
2815
 
    # Value so far
2816
 
    value = datetime.timedelta()
2817
 
    found_token = None
2818
 
    # Following valid tokens
2819
 
    followers = frozenset((token_duration, ))
2820
 
    # String left to parse
2821
 
    s = duration
2822
 
    # Loop until end token is found
2823
 
    while found_token is not token_end:
2824
 
        # Search for any currently valid tokens
2825
 
        for token in followers:
2826
 
            match = token.regexp.match(s)
2827
 
            if match is not None:
2828
 
                # Token found
2829
 
                if token.value is not None:
2830
 
                    # Value found, parse digits
2831
 
                    factor = int(match.group(1), 10)
2832
 
                    # Add to value so far
2833
 
                    value += factor * token.value
2834
 
                # Strip token from string
2835
 
                s = token.regexp.sub("", s, 1)
2836
 
                # Go to found token
2837
 
                found_token = token
2838
 
                # Set valid next tokens
2839
 
                followers = found_token.followers
2840
 
                break
2841
 
        else:
2842
 
            # No currently valid tokens were found
2843
 
            raise ValueError("Invalid RFC 3339 duration: {!r}"
2844
 
                             .format(duration))
2845
 
    # End token found
2846
 
    return value
2847
 
 
2848
574
 
2849
575
def string_to_delta(interval):
2850
576
    """Parse a string and return a datetime.timedelta
2857
583
    datetime.timedelta(0, 3600)
2858
584
    >>> string_to_delta('24h')
2859
585
    datetime.timedelta(1)
2860
 
    >>> string_to_delta('1w')
 
586
    >>> string_to_delta(u'1w')
2861
587
    datetime.timedelta(7)
2862
588
    >>> string_to_delta('5m 30s')
2863
589
    datetime.timedelta(0, 330)
2864
590
    """
2865
 
 
2866
 
    try:
2867
 
        return rfc3339_duration_to_delta(interval)
2868
 
    except ValueError:
2869
 
        pass
2870
 
 
2871
591
    timevalue = datetime.timedelta(0)
2872
592
    for s in interval.split():
2873
593
        try:
2874
 
            suffix = s[-1]
2875
 
            value = int(s[:-1])
2876
 
            if suffix == "d":
 
594
            suffix=unicode(s[-1])
 
595
            value=int(s[:-1])
 
596
            if suffix == u"d":
2877
597
                delta = datetime.timedelta(value)
2878
 
            elif suffix == "s":
 
598
            elif suffix == u"s":
2879
599
                delta = datetime.timedelta(0, value)
2880
 
            elif suffix == "m":
 
600
            elif suffix == u"m":
2881
601
                delta = datetime.timedelta(0, 0, 0, 0, value)
2882
 
            elif suffix == "h":
 
602
            elif suffix == u"h":
2883
603
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
2884
 
            elif suffix == "w":
 
604
            elif suffix == u"w":
2885
605
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
2886
606
            else:
2887
 
                raise ValueError("Unknown suffix {!r}".format(suffix))
2888
 
        except IndexError as e:
2889
 
            raise ValueError(*(e.args))
 
607
                raise ValueError
 
608
        except (ValueError, IndexError):
 
609
            raise ValueError
2890
610
        timevalue += delta
2891
611
    return timevalue
2892
612
 
2893
613
 
2894
 
def daemon(nochdir=False, noclose=False):
 
614
def server_state_changed(state):
 
615
    """Derived from the Avahi example code"""
 
616
    if state == avahi.SERVER_COLLISION:
 
617
        logger.error(u"Zeroconf server name collision")
 
618
        service.remove()
 
619
    elif state == avahi.SERVER_RUNNING:
 
620
        service.add()
 
621
 
 
622
 
 
623
def entry_group_state_changed(state, error):
 
624
    """Derived from the Avahi example code"""
 
625
    logger.debug(u"Avahi state change: %i", state)
 
626
    
 
627
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
628
        logger.debug(u"Zeroconf service established.")
 
629
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
630
        logger.warning(u"Zeroconf service name collision.")
 
631
        service.rename()
 
632
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
633
        logger.critical(u"Avahi: Error in group state changed %s",
 
634
                        unicode(error))
 
635
        raise AvahiGroupError("State changed: %s", str(error))
 
636
 
 
637
def if_nametoindex(interface):
 
638
    """Call the C function if_nametoindex(), or equivalent"""
 
639
    global if_nametoindex
 
640
    try:
 
641
        if "ctypes.util" not in sys.modules:
 
642
            import ctypes.util
 
643
        if_nametoindex = ctypes.cdll.LoadLibrary\
 
644
            (ctypes.util.find_library("c")).if_nametoindex
 
645
    except (OSError, AttributeError):
 
646
        if "struct" not in sys.modules:
 
647
            import struct
 
648
        if "fcntl" not in sys.modules:
 
649
            import fcntl
 
650
        def if_nametoindex(interface):
 
651
            "Get an interface index the hard way, i.e. using fcntl()"
 
652
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
653
            s = socket.socket()
 
654
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
655
                                struct.pack("16s16x", interface))
 
656
            s.close()
 
657
            interface_index = struct.unpack("I", ifreq[16:20])[0]
 
658
            return interface_index
 
659
    return if_nametoindex(interface)
 
660
 
 
661
 
 
662
def daemon(nochdir = False, noclose = False):
2895
663
    """See daemon(3).  Standard BSD Unix function.
2896
 
 
2897
664
    This should really exist as os.daemon, but it doesn't (yet)."""
2898
665
    if os.fork():
2899
666
        sys.exit()
2904
671
        sys.exit()
2905
672
    if not noclose:
2906
673
        # Close all standard open file descriptors
2907
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
 
674
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
2908
675
        if not stat.S_ISCHR(os.fstat(null).st_mode):
2909
676
            raise OSError(errno.ENODEV,
2910
 
                          "{} not a character device"
2911
 
                          .format(os.devnull))
 
677
                          "/dev/null not a character device")
2912
678
        os.dup2(null, sys.stdin.fileno())
2913
679
        os.dup2(null, sys.stdout.fileno())
2914
680
        os.dup2(null, sys.stderr.fileno())
2917
683
 
2918
684
 
2919
685
def main():
2920
 
 
2921
 
    ##################################################################
2922
 
    # Parsing of options, both command line and config file
2923
 
 
2924
 
    parser = argparse.ArgumentParser()
2925
 
    parser.add_argument("-v", "--version", action="version",
2926
 
                        version="%(prog)s {}".format(version),
2927
 
                        help="show version number and exit")
2928
 
    parser.add_argument("-i", "--interface", metavar="IF",
2929
 
                        help="Bind to interface IF")
2930
 
    parser.add_argument("-a", "--address",
2931
 
                        help="Address to listen for requests on")
2932
 
    parser.add_argument("-p", "--port", type=int,
2933
 
                        help="Port number to receive requests on")
2934
 
    parser.add_argument("--check", action="store_true",
2935
 
                        help="Run self-test")
2936
 
    parser.add_argument("--debug", action="store_true",
2937
 
                        help="Debug mode; run in foreground and log"
2938
 
                        " to terminal", default=None)
2939
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
2940
 
                        help="Debug level for stdout output")
2941
 
    parser.add_argument("--priority", help="GnuTLS"
2942
 
                        " priority string (see GnuTLS documentation)")
2943
 
    parser.add_argument("--servicename",
2944
 
                        metavar="NAME", help="Zeroconf service name")
2945
 
    parser.add_argument("--configdir",
2946
 
                        default="/etc/mandos", metavar="DIR",
2947
 
                        help="Directory to search for configuration"
2948
 
                        " files")
2949
 
    parser.add_argument("--no-dbus", action="store_false",
2950
 
                        dest="use_dbus", help="Do not provide D-Bus"
2951
 
                        " system bus interface", default=None)
2952
 
    parser.add_argument("--no-ipv6", action="store_false",
2953
 
                        dest="use_ipv6", help="Do not use IPv6",
2954
 
                        default=None)
2955
 
    parser.add_argument("--no-restore", action="store_false",
2956
 
                        dest="restore", help="Do not restore stored"
2957
 
                        " state", default=None)
2958
 
    parser.add_argument("--socket", type=int,
2959
 
                        help="Specify a file descriptor to a network"
2960
 
                        " socket to use instead of creating one")
2961
 
    parser.add_argument("--statedir", metavar="DIR",
2962
 
                        help="Directory to save/restore state in")
2963
 
    parser.add_argument("--foreground", action="store_true",
2964
 
                        help="Run in foreground", default=None)
2965
 
    parser.add_argument("--no-zeroconf", action="store_false",
2966
 
                        dest="zeroconf", help="Do not use Zeroconf",
2967
 
                        default=None)
2968
 
 
2969
 
    options = parser.parse_args()
2970
 
 
 
686
    global main_loop_started
 
687
    main_loop_started = False
 
688
    
 
689
    parser = OptionParser(version = "%%prog %s" % version)
 
690
    parser.add_option("-i", "--interface", type="string",
 
691
                      metavar="IF", help="Bind to interface IF")
 
692
    parser.add_option("-a", "--address", type="string",
 
693
                      help="Address to listen for requests on")
 
694
    parser.add_option("-p", "--port", type="int",
 
695
                      help="Port number to receive requests on")
 
696
    parser.add_option("--check", action="store_true", default=False,
 
697
                      help="Run self-test")
 
698
    parser.add_option("--debug", action="store_true",
 
699
                      help="Debug mode; run in foreground and log to"
 
700
                      " terminal")
 
701
    parser.add_option("--priority", type="string", help="GnuTLS"
 
702
                      " priority string (see GnuTLS documentation)")
 
703
    parser.add_option("--servicename", type="string", metavar="NAME",
 
704
                      help="Zeroconf service name")
 
705
    parser.add_option("--configdir", type="string",
 
706
                      default="/etc/mandos", metavar="DIR",
 
707
                      help="Directory to search for configuration"
 
708
                      " files")
 
709
    (options, args) = parser.parse_args()
 
710
    
2971
711
    if options.check:
2972
712
        import doctest
2973
 
        fail_count, test_count = doctest.testmod()
2974
 
        sys.exit(os.EX_OK if fail_count == 0 else 1)
2975
 
 
 
713
        doctest.testmod()
 
714
        sys.exit()
 
715
    
2976
716
    # Default values for config file for server-global settings
2977
 
    if gnutls.has_rawpk:
2978
 
        priority = ("SECURE128:!CTYPE-X.509:+CTYPE-RAWPK:!RSA"
2979
 
                    ":!VERS-ALL:+VERS-TLS1.3:%PROFILE_ULTRA")
2980
 
    else:
2981
 
        priority = ("SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"
2982
 
                    ":+SIGN-DSA-SHA256")
2983
 
    server_defaults = {"interface": "",
2984
 
                       "address": "",
2985
 
                       "port": "",
2986
 
                       "debug": "False",
2987
 
                       "priority": priority,
2988
 
                       "servicename": "Mandos",
2989
 
                       "use_dbus": "True",
2990
 
                       "use_ipv6": "True",
2991
 
                       "debuglevel": "",
2992
 
                       "restore": "True",
2993
 
                       "socket": "",
2994
 
                       "statedir": "/var/lib/mandos",
2995
 
                       "foreground": "False",
2996
 
                       "zeroconf": "True",
2997
 
                       }
2998
 
    del priority
2999
 
 
 
717
    server_defaults = { "interface": "",
 
718
                        "address": "",
 
719
                        "port": "",
 
720
                        "debug": "False",
 
721
                        "priority":
 
722
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
723
                        "servicename": "Mandos",
 
724
                        }
 
725
    
3000
726
    # Parse config file for server-global settings
3001
 
    server_config = configparser.SafeConfigParser(server_defaults)
 
727
    server_config = ConfigParser.SafeConfigParser(server_defaults)
3002
728
    del server_defaults
3003
729
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
3004
730
    # Convert the SafeConfigParser object to a dict
3005
731
    server_settings = server_config.defaults()
3006
 
    # Use the appropriate methods on the non-string config options
3007
 
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
3008
 
                   "foreground", "zeroconf"):
3009
 
        server_settings[option] = server_config.getboolean("DEFAULT",
3010
 
                                                           option)
3011
 
    if server_settings["port"]:
3012
 
        server_settings["port"] = server_config.getint("DEFAULT",
3013
 
                                                       "port")
3014
 
    if server_settings["socket"]:
3015
 
        server_settings["socket"] = server_config.getint("DEFAULT",
3016
 
                                                         "socket")
3017
 
        # Later, stdin will, and stdout and stderr might, be dup'ed
3018
 
        # over with an opened os.devnull.  But we don't want this to
3019
 
        # happen with a supplied network socket.
3020
 
        if 0 <= server_settings["socket"] <= 2:
3021
 
            server_settings["socket"] = os.dup(server_settings
3022
 
                                               ["socket"])
 
732
    # Use getboolean on the boolean config option
 
733
    server_settings["debug"] = server_config.getboolean\
 
734
                               ("DEFAULT", "debug")
3023
735
    del server_config
3024
 
 
 
736
    
3025
737
    # Override the settings from the config file with command line
3026
738
    # options, if set.
3027
739
    for option in ("interface", "address", "port", "debug",
3028
 
                   "priority", "servicename", "configdir", "use_dbus",
3029
 
                   "use_ipv6", "debuglevel", "restore", "statedir",
3030
 
                   "socket", "foreground", "zeroconf"):
 
740
                   "priority", "servicename", "configdir"):
3031
741
        value = getattr(options, option)
3032
742
        if value is not None:
3033
743
            server_settings[option] = value
3034
744
    del options
3035
 
    # Force all strings to be unicode
3036
 
    for option in server_settings.keys():
3037
 
        if isinstance(server_settings[option], bytes):
3038
 
            server_settings[option] = (server_settings[option]
3039
 
                                       .decode("utf-8"))
3040
 
    # Force all boolean options to be boolean
3041
 
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
3042
 
                   "foreground", "zeroconf"):
3043
 
        server_settings[option] = bool(server_settings[option])
3044
 
    # Debug implies foreground
3045
 
    if server_settings["debug"]:
3046
 
        server_settings["foreground"] = True
3047
745
    # Now we have our good server settings in "server_settings"
3048
 
 
3049
 
    ##################################################################
3050
 
 
3051
 
    if (not server_settings["zeroconf"]
3052
 
        and not (server_settings["port"]
3053
 
                 or server_settings["socket"] != "")):
3054
 
        parser.error("Needs port or socket to work without Zeroconf")
3055
 
 
3056
 
    # For convenience
 
746
    
3057
747
    debug = server_settings["debug"]
3058
 
    debuglevel = server_settings["debuglevel"]
3059
 
    use_dbus = server_settings["use_dbus"]
3060
 
    use_ipv6 = server_settings["use_ipv6"]
3061
 
    stored_state_path = os.path.join(server_settings["statedir"],
3062
 
                                     stored_state_file)
3063
 
    foreground = server_settings["foreground"]
3064
 
    zeroconf = server_settings["zeroconf"]
3065
 
 
3066
 
    if debug:
3067
 
        initlogger(debug, logging.DEBUG)
3068
 
    else:
3069
 
        if not debuglevel:
3070
 
            initlogger(debug)
3071
 
        else:
3072
 
            level = getattr(logging, debuglevel.upper())
3073
 
            initlogger(debug, level)
3074
 
 
 
748
    
 
749
    if not debug:
 
750
        syslogger.setLevel(logging.WARNING)
 
751
        console.setLevel(logging.WARNING)
 
752
    
3075
753
    if server_settings["servicename"] != "Mandos":
3076
 
        syslogger.setFormatter(
3077
 
            logging.Formatter('Mandos ({}) [%(process)d]:'
3078
 
                              ' %(levelname)s: %(message)s'.format(
3079
 
                                  server_settings["servicename"])))
3080
 
 
 
754
        syslogger.setFormatter(logging.Formatter\
 
755
                               ('Mandos (%s): %%(levelname)s:'
 
756
                                ' %%(message)s'
 
757
                                % server_settings["servicename"]))
 
758
    
3081
759
    # Parse config file with clients
3082
 
    client_config = configparser.SafeConfigParser(Client
3083
 
                                                  .client_defaults)
 
760
    client_defaults = { "timeout": "1h",
 
761
                        "interval": "5m",
 
762
                        "checker": "fping -q -- %(host)s",
 
763
                        "host": "",
 
764
                        }
 
765
    client_config = ConfigParser.SafeConfigParser(client_defaults)
3084
766
    client_config.read(os.path.join(server_settings["configdir"],
3085
767
                                    "clients.conf"))
3086
 
 
3087
 
    global mandos_dbus_service
3088
 
    mandos_dbus_service = None
3089
 
 
3090
 
    socketfd = None
3091
 
    if server_settings["socket"] != "":
3092
 
        socketfd = server_settings["socket"]
3093
 
    tcp_server = MandosServer(
3094
 
        (server_settings["address"], server_settings["port"]),
3095
 
        ClientHandler,
3096
 
        interface=(server_settings["interface"] or None),
3097
 
        use_ipv6=use_ipv6,
3098
 
        gnutls_priority=server_settings["priority"],
3099
 
        use_dbus=use_dbus,
3100
 
        socketfd=socketfd)
3101
 
    if not foreground:
3102
 
        pidfilename = "/run/mandos.pid"
3103
 
        if not os.path.isdir("/run/."):
3104
 
            pidfilename = "/var/run/mandos.pid"
3105
 
        pidfile = None
3106
 
        try:
3107
 
            pidfile = codecs.open(pidfilename, "w", encoding="utf-8")
3108
 
        except IOError as e:
3109
 
            logger.error("Could not open file %r", pidfilename,
3110
 
                         exc_info=e)
3111
 
 
3112
 
    for name, group in (("_mandos", "_mandos"),
3113
 
                        ("mandos", "mandos"),
3114
 
                        ("nobody", "nogroup")):
3115
 
        try:
3116
 
            uid = pwd.getpwnam(name).pw_uid
3117
 
            gid = pwd.getpwnam(group).pw_gid
3118
 
            break
3119
 
        except KeyError:
3120
 
            continue
3121
 
    else:
3122
 
        uid = 65534
3123
 
        gid = 65534
3124
 
    try:
 
768
    
 
769
    clients = Set()
 
770
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
771
                                 server_settings["port"]),
 
772
                                tcp_handler,
 
773
                                settings=server_settings,
 
774
                                clients=clients)
 
775
    pidfilename = "/var/run/mandos.pid"
 
776
    try:
 
777
        pidfile = open(pidfilename, "w")
 
778
    except IOError, error:
 
779
        logger.error("Could not open file %r", pidfilename)
 
780
    
 
781
    uid = 65534
 
782
    gid = 65534
 
783
    try:
 
784
        uid = pwd.getpwnam("mandos").pw_uid
 
785
    except KeyError:
 
786
        try:
 
787
            uid = pwd.getpwnam("nobody").pw_uid
 
788
        except KeyError:
 
789
            pass
 
790
    try:
 
791
        gid = pwd.getpwnam("mandos").pw_gid
 
792
    except KeyError:
 
793
        try:
 
794
            gid = pwd.getpwnam("nogroup").pw_gid
 
795
        except KeyError:
 
796
            pass
 
797
    try:
 
798
        os.setuid(uid)
3125
799
        os.setgid(gid)
3126
 
        os.setuid(uid)
3127
 
        if debug:
3128
 
            logger.debug("Did setuid/setgid to {}:{}".format(uid,
3129
 
                                                             gid))
3130
 
    except OSError as error:
3131
 
        logger.warning("Failed to setuid/setgid to {}:{}: {}"
3132
 
                       .format(uid, gid, os.strerror(error.errno)))
3133
 
        if error.errno != errno.EPERM:
3134
 
            raise
3135
 
 
3136
 
    if debug:
3137
 
        # Enable all possible GnuTLS debugging
3138
 
 
3139
 
        # "Use a log level over 10 to enable all debugging options."
3140
 
        # - GnuTLS manual
3141
 
        gnutls.global_set_log_level(11)
3142
 
 
3143
 
        @gnutls.log_func
3144
 
        def debug_gnutls(level, string):
3145
 
            logger.debug("GnuTLS: %s", string[:-1])
3146
 
 
3147
 
        gnutls.global_set_log_function(debug_gnutls)
3148
 
 
3149
 
        # Redirect stdin so all checkers get /dev/null
3150
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
3151
 
        os.dup2(null, sys.stdin.fileno())
3152
 
        if null > 2:
3153
 
            os.close(null)
3154
 
 
3155
 
    # Need to fork before connecting to D-Bus
3156
 
    if not foreground:
3157
 
        # Close all input and output, do double fork, etc.
3158
 
        daemon()
3159
 
 
3160
 
    # multiprocessing will use threads, so before we use GLib we need
3161
 
    # to inform GLib that threads will be used.
3162
 
    GLib.threads_init()
3163
 
 
 
800
    except OSError, error:
 
801
        if error[0] != errno.EPERM:
 
802
            raise error
 
803
    
 
804
    global service
 
805
    service = AvahiService(name = server_settings["servicename"],
 
806
                           type = "_mandos._tcp", );
 
807
    if server_settings["interface"]:
 
808
        service.interface = if_nametoindex\
 
809
                            (server_settings["interface"])
 
810
    
3164
811
    global main_loop
 
812
    global bus
 
813
    global server
3165
814
    # From the Avahi example code
3166
 
    DBusGMainLoop(set_as_default=True)
3167
 
    main_loop = GLib.MainLoop()
 
815
    DBusGMainLoop(set_as_default=True )
 
816
    main_loop = gobject.MainLoop()
3168
817
    bus = dbus.SystemBus()
 
818
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
 
819
                                           avahi.DBUS_PATH_SERVER),
 
820
                            avahi.DBUS_INTERFACE_SERVER)
3169
821
    # End of Avahi example code
3170
 
    if use_dbus:
3171
 
        try:
3172
 
            bus_name = dbus.service.BusName("se.recompile.Mandos",
3173
 
                                            bus,
3174
 
                                            do_not_queue=True)
3175
 
            old_bus_name = dbus.service.BusName(
3176
 
                "se.bsnet.fukt.Mandos", bus,
3177
 
                do_not_queue=True)
3178
 
        except dbus.exceptions.DBusException as e:
3179
 
            logger.error("Disabling D-Bus:", exc_info=e)
3180
 
            use_dbus = False
3181
 
            server_settings["use_dbus"] = False
3182
 
            tcp_server.use_dbus = False
3183
 
    if zeroconf:
3184
 
        protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
3185
 
        service = AvahiServiceToSyslog(
3186
 
            name=server_settings["servicename"],
3187
 
            servicetype="_mandos._tcp",
3188
 
            protocol=protocol,
3189
 
            bus=bus)
3190
 
        if server_settings["interface"]:
3191
 
            service.interface = if_nametoindex(
3192
 
                server_settings["interface"].encode("utf-8"))
3193
 
 
3194
 
    global multiprocessing_manager
3195
 
    multiprocessing_manager = multiprocessing.Manager()
3196
 
 
3197
 
    client_class = Client
3198
 
    if use_dbus:
3199
 
        client_class = functools.partial(ClientDBus, bus=bus)
3200
 
 
3201
 
    client_settings = Client.config_parser(client_config)
3202
 
    old_client_settings = {}
3203
 
    clients_data = {}
3204
 
 
3205
 
    # This is used to redirect stdout and stderr for checker processes
3206
 
    global wnull
3207
 
    wnull = open(os.devnull, "w")  # A writable /dev/null
3208
 
    # Only used if server is running in foreground but not in debug
3209
 
    # mode
3210
 
    if debug or not foreground:
3211
 
        wnull.close()
3212
 
 
3213
 
    # Get client data and settings from last running state.
3214
 
    if server_settings["restore"]:
3215
 
        try:
3216
 
            with open(stored_state_path, "rb") as stored_state:
3217
 
                if sys.version_info.major == 2:
3218
 
                    clients_data, old_client_settings = pickle.load(
3219
 
                        stored_state)
3220
 
                else:
3221
 
                    bytes_clients_data, bytes_old_client_settings = (
3222
 
                        pickle.load(stored_state, encoding="bytes"))
3223
 
                    #   Fix bytes to strings
3224
 
                    #  clients_data
3225
 
                    # .keys()
3226
 
                    clients_data = {(key.decode("utf-8")
3227
 
                                     if isinstance(key, bytes)
3228
 
                                     else key): value
3229
 
                                    for key, value in
3230
 
                                    bytes_clients_data.items()}
3231
 
                    del bytes_clients_data
3232
 
                    for key in clients_data:
3233
 
                        value = {(k.decode("utf-8")
3234
 
                                  if isinstance(k, bytes) else k): v
3235
 
                                 for k, v in
3236
 
                                 clients_data[key].items()}
3237
 
                        clients_data[key] = value
3238
 
                        # .client_structure
3239
 
                        value["client_structure"] = [
3240
 
                            (s.decode("utf-8")
3241
 
                             if isinstance(s, bytes)
3242
 
                             else s) for s in
3243
 
                            value["client_structure"]]
3244
 
                        # .name & .host
3245
 
                        for k in ("name", "host"):
3246
 
                            if isinstance(value[k], bytes):
3247
 
                                value[k] = value[k].decode("utf-8")
3248
 
                        if "key_id" not in value:
3249
 
                            value["key_id"] = ""
3250
 
                        elif "fingerprint" not in value:
3251
 
                            value["fingerprint"] = ""
3252
 
                    #  old_client_settings
3253
 
                    # .keys()
3254
 
                    old_client_settings = {
3255
 
                        (key.decode("utf-8")
3256
 
                         if isinstance(key, bytes)
3257
 
                         else key): value
3258
 
                        for key, value in
3259
 
                        bytes_old_client_settings.items()}
3260
 
                    del bytes_old_client_settings
3261
 
                    # .host
3262
 
                    for value in old_client_settings.values():
3263
 
                        if isinstance(value["host"], bytes):
3264
 
                            value["host"] = (value["host"]
3265
 
                                             .decode("utf-8"))
3266
 
            os.remove(stored_state_path)
3267
 
        except IOError as e:
3268
 
            if e.errno == errno.ENOENT:
3269
 
                logger.warning("Could not load persistent state:"
3270
 
                               " {}".format(os.strerror(e.errno)))
3271
 
            else:
3272
 
                logger.critical("Could not load persistent state:",
3273
 
                                exc_info=e)
3274
 
                raise
3275
 
        except EOFError as e:
3276
 
            logger.warning("Could not load persistent state: "
3277
 
                           "EOFError:",
3278
 
                           exc_info=e)
3279
 
 
3280
 
    with PGPEngine() as pgp:
3281
 
        for client_name, client in clients_data.items():
3282
 
            # Skip removed clients
3283
 
            if client_name not in client_settings:
3284
 
                continue
3285
 
 
3286
 
            # Decide which value to use after restoring saved state.
3287
 
            # We have three different values: Old config file,
3288
 
            # new config file, and saved state.
3289
 
            # New config value takes precedence if it differs from old
3290
 
            # config value, otherwise use saved state.
3291
 
            for name, value in client_settings[client_name].items():
3292
 
                try:
3293
 
                    # For each value in new config, check if it
3294
 
                    # differs from the old config value (Except for
3295
 
                    # the "secret" attribute)
3296
 
                    if (name != "secret"
3297
 
                        and (value !=
3298
 
                             old_client_settings[client_name][name])):
3299
 
                        client[name] = value
3300
 
                except KeyError:
3301
 
                    pass
3302
 
 
3303
 
            # Clients who has passed its expire date can still be
3304
 
            # enabled if its last checker was successful.  A Client
3305
 
            # whose checker succeeded before we stored its state is
3306
 
            # assumed to have successfully run all checkers during
3307
 
            # downtime.
3308
 
            if client["enabled"]:
3309
 
                if datetime.datetime.utcnow() >= client["expires"]:
3310
 
                    if not client["last_checked_ok"]:
3311
 
                        logger.warning(
3312
 
                            "disabling client {} - Client never "
3313
 
                            "performed a successful checker".format(
3314
 
                                client_name))
3315
 
                        client["enabled"] = False
3316
 
                    elif client["last_checker_status"] != 0:
3317
 
                        logger.warning(
3318
 
                            "disabling client {} - Client last"
3319
 
                            " checker failed with error code"
3320
 
                            " {}".format(
3321
 
                                client_name,
3322
 
                                client["last_checker_status"]))
3323
 
                        client["enabled"] = False
3324
 
                    else:
3325
 
                        client["expires"] = (
3326
 
                            datetime.datetime.utcnow()
3327
 
                            + client["timeout"])
3328
 
                        logger.debug("Last checker succeeded,"
3329
 
                                     " keeping {} enabled".format(
3330
 
                                         client_name))
3331
 
            try:
3332
 
                client["secret"] = pgp.decrypt(
3333
 
                    client["encrypted_secret"],
3334
 
                    client_settings[client_name]["secret"])
3335
 
            except PGPError:
3336
 
                # If decryption fails, we use secret from new settings
3337
 
                logger.debug("Failed to decrypt {} old secret".format(
3338
 
                    client_name))
3339
 
                client["secret"] = (client_settings[client_name]
3340
 
                                    ["secret"])
3341
 
 
3342
 
    # Add/remove clients based on new changes made to config
3343
 
    for client_name in (set(old_client_settings)
3344
 
                        - set(client_settings)):
3345
 
        del clients_data[client_name]
3346
 
    for client_name in (set(client_settings)
3347
 
                        - set(old_client_settings)):
3348
 
        clients_data[client_name] = client_settings[client_name]
3349
 
 
3350
 
    # Create all client objects
3351
 
    for client_name, client in clients_data.items():
3352
 
        tcp_server.clients[client_name] = client_class(
3353
 
            name=client_name,
3354
 
            settings=client,
3355
 
            server_settings=server_settings)
3356
 
 
3357
 
    if not tcp_server.clients:
3358
 
        logger.warning("No clients defined")
3359
 
 
3360
 
    if not foreground:
3361
 
        if pidfile is not None:
3362
 
            pid = os.getpid()
3363
 
            try:
3364
 
                with pidfile:
3365
 
                    print(pid, file=pidfile)
3366
 
            except IOError:
3367
 
                logger.error("Could not write to file %r with PID %d",
3368
 
                             pidfilename, pid)
 
822
    
 
823
    def remove_from_clients(client):
 
824
        clients.remove(client)
 
825
        if not clients:
 
826
            logger.critical(u"No clients left, exiting")
 
827
            sys.exit()
 
828
    
 
829
    clients.update(Set(Client(name = section,
 
830
                              stop_hook = remove_from_clients,
 
831
                              config
 
832
                              = dict(client_config.items(section)))
 
833
                       for section in client_config.sections()))
 
834
    if not clients:
 
835
        logger.critical(u"No clients defined")
 
836
        sys.exit(1)
 
837
    
 
838
    if debug:
 
839
        # Redirect stdin so all checkers get /dev/null
 
840
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
841
        os.dup2(null, sys.stdin.fileno())
 
842
        if null > 2:
 
843
            os.close(null)
 
844
    else:
 
845
        # No console logging
 
846
        logger.removeHandler(console)
 
847
        # Close all input and output, do double fork, etc.
 
848
        daemon()
 
849
    
 
850
    try:
 
851
        pid = os.getpid()
 
852
        pidfile.write(str(pid) + "\n")
 
853
        pidfile.close()
3369
854
        del pidfile
3370
 
        del pidfilename
3371
 
 
3372
 
    for termsig in (signal.SIGHUP, signal.SIGTERM):
3373
 
        GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,
3374
 
                             lambda: main_loop.quit() and False)
3375
 
 
3376
 
    if use_dbus:
3377
 
 
3378
 
        @alternate_dbus_interfaces(
3379
 
            {"se.recompile.Mandos": "se.bsnet.fukt.Mandos"})
3380
 
        class MandosDBusService(DBusObjectWithObjectManager):
3381
 
            """A D-Bus proxy object"""
3382
 
 
3383
 
            def __init__(self):
3384
 
                dbus.service.Object.__init__(self, bus, "/")
3385
 
 
3386
 
            _interface = "se.recompile.Mandos"
3387
 
 
3388
 
            @dbus.service.signal(_interface, signature="o")
3389
 
            def ClientAdded(self, objpath):
3390
 
                "D-Bus signal"
3391
 
                pass
3392
 
 
3393
 
            @dbus.service.signal(_interface, signature="ss")
3394
 
            def ClientNotFound(self, key_id, address):
3395
 
                "D-Bus signal"
3396
 
                pass
3397
 
 
3398
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3399
 
                               "true"})
3400
 
            @dbus.service.signal(_interface, signature="os")
3401
 
            def ClientRemoved(self, objpath, name):
3402
 
                "D-Bus signal"
3403
 
                pass
3404
 
 
3405
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3406
 
                               "true"})
3407
 
            @dbus.service.method(_interface, out_signature="ao")
3408
 
            def GetAllClients(self):
3409
 
                "D-Bus method"
3410
 
                return dbus.Array(c.dbus_object_path for c in
3411
 
                                  tcp_server.clients.values())
3412
 
 
3413
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3414
 
                               "true"})
3415
 
            @dbus.service.method(_interface,
3416
 
                                 out_signature="a{oa{sv}}")
3417
 
            def GetAllClientsWithProperties(self):
3418
 
                "D-Bus method"
3419
 
                return dbus.Dictionary(
3420
 
                    {c.dbus_object_path: c.GetAll(
3421
 
                        "se.recompile.Mandos.Client")
3422
 
                     for c in tcp_server.clients.values()},
3423
 
                    signature="oa{sv}")
3424
 
 
3425
 
            @dbus.service.method(_interface, in_signature="o")
3426
 
            def RemoveClient(self, object_path):
3427
 
                "D-Bus method"
3428
 
                for c in tcp_server.clients.values():
3429
 
                    if c.dbus_object_path == object_path:
3430
 
                        del tcp_server.clients[c.name]
3431
 
                        c.remove_from_connection()
3432
 
                        # Don't signal the disabling
3433
 
                        c.disable(quiet=True)
3434
 
                        # Emit D-Bus signal for removal
3435
 
                        self.client_removed_signal(c)
3436
 
                        return
3437
 
                raise KeyError(object_path)
3438
 
 
3439
 
            del _interface
3440
 
 
3441
 
            @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
3442
 
                                 out_signature="a{oa{sa{sv}}}")
3443
 
            def GetManagedObjects(self):
3444
 
                """D-Bus method"""
3445
 
                return dbus.Dictionary(
3446
 
                    {client.dbus_object_path:
3447
 
                     dbus.Dictionary(
3448
 
                         {interface: client.GetAll(interface)
3449
 
                          for interface in
3450
 
                          client._get_all_interface_names()})
3451
 
                     for client in tcp_server.clients.values()})
3452
 
 
3453
 
            def client_added_signal(self, client):
3454
 
                """Send the new standard signal and the old signal"""
3455
 
                if use_dbus:
3456
 
                    # New standard signal
3457
 
                    self.InterfacesAdded(
3458
 
                        client.dbus_object_path,
3459
 
                        dbus.Dictionary(
3460
 
                            {interface: client.GetAll(interface)
3461
 
                             for interface in
3462
 
                             client._get_all_interface_names()}))
3463
 
                    # Old signal
3464
 
                    self.ClientAdded(client.dbus_object_path)
3465
 
 
3466
 
            def client_removed_signal(self, client):
3467
 
                """Send the new standard signal and the old signal"""
3468
 
                if use_dbus:
3469
 
                    # New standard signal
3470
 
                    self.InterfacesRemoved(
3471
 
                        client.dbus_object_path,
3472
 
                        client._get_all_interface_names())
3473
 
                    # Old signal
3474
 
                    self.ClientRemoved(client.dbus_object_path,
3475
 
                                       client.name)
3476
 
 
3477
 
        mandos_dbus_service = MandosDBusService()
3478
 
 
3479
 
    # Save modules to variables to exempt the modules from being
3480
 
    # unloaded before the function registered with atexit() is run.
3481
 
    mp = multiprocessing
3482
 
    wn = wnull
3483
 
 
 
855
    except IOError, err:
 
856
        logger.error(u"Could not write to file %r with PID %d",
 
857
                     pidfilename, pid)
 
858
    except NameError:
 
859
        # "pidfile" was never created
 
860
        pass
 
861
    del pidfilename
 
862
    
3484
863
    def cleanup():
3485
864
        "Cleanup function; run on exit"
3486
 
        if zeroconf:
3487
 
            service.cleanup()
3488
 
 
3489
 
        mp.active_children()
3490
 
        wn.close()
3491
 
        if not (tcp_server.clients or client_settings):
3492
 
            return
3493
 
 
3494
 
        # Store client before exiting. Secrets are encrypted with key
3495
 
        # based on what config file has. If config file is
3496
 
        # removed/edited, old secret will thus be unrecovable.
3497
 
        clients = {}
3498
 
        with PGPEngine() as pgp:
3499
 
            for client in tcp_server.clients.values():
3500
 
                key = client_settings[client.name]["secret"]
3501
 
                client.encrypted_secret = pgp.encrypt(client.secret,
3502
 
                                                      key)
3503
 
                client_dict = {}
3504
 
 
3505
 
                # A list of attributes that can not be pickled
3506
 
                # + secret.
3507
 
                exclude = {"bus", "changedstate", "secret",
3508
 
                           "checker", "server_settings"}
3509
 
                for name, typ in inspect.getmembers(dbus.service
3510
 
                                                    .Object):
3511
 
                    exclude.add(name)
3512
 
 
3513
 
                client_dict["encrypted_secret"] = (client
3514
 
                                                   .encrypted_secret)
3515
 
                for attr in client.client_structure:
3516
 
                    if attr not in exclude:
3517
 
                        client_dict[attr] = getattr(client, attr)
3518
 
 
3519
 
                clients[client.name] = client_dict
3520
 
                del client_settings[client.name]["secret"]
3521
 
 
3522
 
        try:
3523
 
            with tempfile.NamedTemporaryFile(
3524
 
                    mode='wb',
3525
 
                    suffix=".pickle",
3526
 
                    prefix='clients-',
3527
 
                    dir=os.path.dirname(stored_state_path),
3528
 
                    delete=False) as stored_state:
3529
 
                pickle.dump((clients, client_settings), stored_state,
3530
 
                            protocol=2)
3531
 
                tempname = stored_state.name
3532
 
            os.rename(tempname, stored_state_path)
3533
 
        except (IOError, OSError) as e:
3534
 
            if not debug:
3535
 
                try:
3536
 
                    os.remove(tempname)
3537
 
                except NameError:
3538
 
                    pass
3539
 
            if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
3540
 
                logger.warning("Could not save persistent state: {}"
3541
 
                               .format(os.strerror(e.errno)))
3542
 
            else:
3543
 
                logger.warning("Could not save persistent state:",
3544
 
                               exc_info=e)
3545
 
                raise
3546
 
 
3547
 
        # Delete all clients, and settings from config
3548
 
        while tcp_server.clients:
3549
 
            name, client = tcp_server.clients.popitem()
3550
 
            if use_dbus:
3551
 
                client.remove_from_connection()
3552
 
            # Don't signal the disabling
3553
 
            client.disable(quiet=True)
3554
 
            # Emit D-Bus signal for removal
3555
 
            if use_dbus:
3556
 
                mandos_dbus_service.client_removed_signal(client)
3557
 
        client_settings.clear()
3558
 
 
 
865
        global group
 
866
        # From the Avahi example code
 
867
        if not group is None:
 
868
            group.Free()
 
869
            group = None
 
870
        # End of Avahi example code
 
871
        
 
872
        while clients:
 
873
            client = clients.pop()
 
874
            client.stop_hook = None
 
875
            client.stop()
 
876
    
3559
877
    atexit.register(cleanup)
3560
 
 
3561
 
    for client in tcp_server.clients.values():
3562
 
        if use_dbus:
3563
 
            # Emit D-Bus signal for adding
3564
 
            mandos_dbus_service.client_added_signal(client)
3565
 
        # Need to initiate checking of clients
3566
 
        if client.enabled:
3567
 
            client.init_checker()
3568
 
 
 
878
    
 
879
    if not debug:
 
880
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
881
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
882
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
883
    
 
884
    for client in clients:
 
885
        client.start()
 
886
    
3569
887
    tcp_server.enable()
3570
888
    tcp_server.server_activate()
3571
 
 
 
889
    
3572
890
    # Find out what port we got
3573
 
    if zeroconf:
3574
 
        service.port = tcp_server.socket.getsockname()[1]
3575
 
    if use_ipv6:
3576
 
        logger.info("Now listening on address %r, port %d,"
3577
 
                    " flowinfo %d, scope_id %d",
3578
 
                    *tcp_server.socket.getsockname())
3579
 
    else:                       # IPv4
3580
 
        logger.info("Now listening on address %r, port %d",
3581
 
                    *tcp_server.socket.getsockname())
3582
 
 
3583
 
    # service.interface = tcp_server.socket.getsockname()[3]
3584
 
 
 
891
    service.port = tcp_server.socket.getsockname()[1]
 
892
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
 
893
                u" scope_id %d" % tcp_server.socket.getsockname())
 
894
    
 
895
    #service.interface = tcp_server.socket.getsockname()[3]
 
896
    
3585
897
    try:
3586
 
        if zeroconf:
3587
 
            # From the Avahi example code
3588
 
            try:
3589
 
                service.activate()
3590
 
            except dbus.exceptions.DBusException as error:
3591
 
                logger.critical("D-Bus Exception", exc_info=error)
3592
 
                cleanup()
3593
 
                sys.exit(1)
3594
 
            # End of Avahi example code
3595
 
 
3596
 
        GLib.io_add_watch(tcp_server.fileno(), GLib.IO_IN,
3597
 
                          lambda *args, **kwargs:
3598
 
                          (tcp_server.handle_request
3599
 
                           (*args[2:], **kwargs) or True))
3600
 
 
3601
 
        logger.debug("Starting main loop")
 
898
        # From the Avahi example code
 
899
        server.connect_to_signal("StateChanged", server_state_changed)
 
900
        try:
 
901
            server_state_changed(server.GetState())
 
902
        except dbus.exceptions.DBusException, error:
 
903
            logger.critical(u"DBusException: %s", error)
 
904
            sys.exit(1)
 
905
        # End of Avahi example code
 
906
        
 
907
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
908
                             lambda *args, **kwargs:
 
909
                             tcp_server.handle_request\
 
910
                             (*args[2:], **kwargs) or True)
 
911
        
 
912
        logger.debug(u"Starting main loop")
 
913
        main_loop_started = True
3602
914
        main_loop.run()
3603
 
    except AvahiError as error:
3604
 
        logger.critical("Avahi Error", exc_info=error)
3605
 
        cleanup()
 
915
    except AvahiError, error:
 
916
        logger.critical(u"AvahiError: %s" + unicode(error))
3606
917
        sys.exit(1)
3607
918
    except KeyboardInterrupt:
3608
919
        if debug:
3609
 
            print("", file=sys.stderr)
3610
 
        logger.debug("Server received KeyboardInterrupt")
3611
 
    logger.debug("Server exiting")
3612
 
    # Must run before the D-Bus bus name gets deregistered
3613
 
    cleanup()
3614
 
 
 
920
            print
3615
921
 
3616
922
if __name__ == '__main__':
3617
923
    main()