/mandos/release

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

« back to all changes in this revision

Viewing changes to server.py

  • Committer: Teddy Hogeborn
  • Date: 2008-08-03 16:05:52 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080803160552-mvqy5klry3wn57x1
* plugins.d/mandosclient.c (initgnutls): Moved "err" variable into its
                                         own code block.
  (start_mandos_communication): Moved call to "initgnutls" to
                                beginning.  Renamed label "exit" to
                                "mandos_end".  Bug fix: set return
                                code if failure to realloc buffer.
                                Close TLS session as early as
                                possible.
  (resolve_callback): Also print interface number when debugging.
  (main): Moved "debug_int" and "config" into their own respective
          code blocks.

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
# following functions: "AvahiService.add", "AvahiService.remove",
 
10
# "server_state_changed", "entry_group_state_changed", and some lines
 
11
# 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 <http://www.gnu.org/licenses/>.
 
28
 
29
# Contact the authors at <mandos@fukt.bsnet.se>.
 
30
 
31
 
 
32
from __future__ import division
 
33
 
 
34
import SocketServer
47
35
import socket
48
 
import argparse
 
36
import select
 
37
from optparse import OptionParser
49
38
import datetime
50
39
import errno
51
 
try:
52
 
    import ConfigParser as configparser
53
 
except ImportError:
54
 
    import configparser
 
40
import gnutls.crypto
 
41
import gnutls.connection
 
42
import gnutls.errors
 
43
import gnutls.library.functions
 
44
import gnutls.library.constants
 
45
import gnutls.library.types
 
46
import ConfigParser
55
47
import sys
56
48
import re
57
49
import os
58
50
import signal
 
51
from sets import Set
59
52
import subprocess
60
53
import atexit
61
54
import stat
62
55
import logging
63
56
import logging.handlers
64
 
import pwd
65
 
import contextlib
66
 
import struct
67
 
import fcntl
68
 
import functools
69
 
try:
70
 
    import cPickle as pickle
71
 
except ImportError:
72
 
    import pickle
73
 
import multiprocessing
74
 
import types
75
 
import binascii
76
 
import tempfile
77
 
import itertools
78
 
import collections
79
 
import codecs
80
57
 
81
58
import dbus
82
 
import dbus.service
83
 
import gi
84
 
from gi.repository import GLib
 
59
import gobject
 
60
import avahi
85
61
from dbus.mainloop.glib import DBusGMainLoop
86
62
import ctypes
87
 
import ctypes.util
88
 
import xml.dom.minidom
89
 
import inspect
90
 
 
91
 
# Try to find the value of SO_BINDTODEVICE:
92
 
try:
93
 
    # This is where SO_BINDTODEVICE is in Python 3.3 (or 3.4?) and
94
 
    # newer, and it is also the most natural place for it:
95
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
96
 
except AttributeError:
97
 
    try:
98
 
        # This is where SO_BINDTODEVICE was up to and including Python
99
 
        # 2.6, and also 3.2:
100
 
        from IN import SO_BINDTODEVICE
101
 
    except ImportError:
102
 
        # In Python 2.7 it seems to have been removed entirely.
103
 
        # Try running the C preprocessor:
104
 
        try:
105
 
            cc = subprocess.Popen(["cc", "--language=c", "-E",
106
 
                                   "/dev/stdin"],
107
 
                                  stdin=subprocess.PIPE,
108
 
                                  stdout=subprocess.PIPE)
109
 
            stdout = cc.communicate(
110
 
                "#include <sys/socket.h>\nSO_BINDTODEVICE\n")[0]
111
 
            SO_BINDTODEVICE = int(stdout.splitlines()[-1])
112
 
        except (OSError, ValueError, IndexError):
113
 
            # No value found
114
 
            SO_BINDTODEVICE = None
115
 
 
116
 
if sys.version_info.major == 2:
117
 
    str = unicode
118
 
 
119
 
if sys.version_info < (3, 2):
120
 
    configparser.Configparser = configparser.SafeConfigParser
121
 
 
122
 
version = "1.8.6"
123
 
stored_state_file = "clients.pickle"
124
 
 
125
 
logger = logging.getLogger()
126
 
syslogger = None
127
 
 
128
 
try:
129
 
    if_nametoindex = ctypes.cdll.LoadLibrary(
130
 
        ctypes.util.find_library("c")).if_nametoindex
131
 
except (OSError, AttributeError):
132
 
 
133
 
    def if_nametoindex(interface):
134
 
        "Get an interface index the hard way, i.e. using fcntl()"
135
 
        SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
136
 
        with contextlib.closing(socket.socket()) as s:
137
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
138
 
                                struct.pack(b"16s16x", interface))
139
 
        interface_index = struct.unpack("I", ifreq[16:20])[0]
140
 
        return interface_index
141
 
 
142
 
 
143
 
def copy_function(func):
144
 
    """Make a copy of a function"""
145
 
    if sys.version_info.major == 2:
146
 
        return types.FunctionType(func.func_code,
147
 
                                  func.func_globals,
148
 
                                  func.func_name,
149
 
                                  func.func_defaults,
150
 
                                  func.func_closure)
151
 
    else:
152
 
        return types.FunctionType(func.__code__,
153
 
                                  func.__globals__,
154
 
                                  func.__name__,
155
 
                                  func.__defaults__,
156
 
                                  func.__closure__)
157
 
 
158
 
 
159
 
def initlogger(debug, level=logging.WARNING):
160
 
    """init logger and add loglevel"""
161
 
 
162
 
    global syslogger
163
 
    syslogger = (logging.handlers.SysLogHandler(
164
 
        facility=logging.handlers.SysLogHandler.LOG_DAEMON,
165
 
        address="/dev/log"))
166
 
    syslogger.setFormatter(logging.Formatter
167
 
                           ('Mandos [%(process)d]: %(levelname)s:'
168
 
                            ' %(message)s'))
169
 
    logger.addHandler(syslogger)
170
 
 
171
 
    if debug:
172
 
        console = logging.StreamHandler()
173
 
        console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
174
 
                                               ' [%(process)d]:'
175
 
                                               ' %(levelname)s:'
176
 
                                               ' %(message)s'))
177
 
        logger.addHandler(console)
178
 
    logger.setLevel(level)
179
 
 
180
 
 
181
 
class PGPError(Exception):
182
 
    """Exception if encryption/decryption fails"""
183
 
    pass
184
 
 
185
 
 
186
 
class PGPEngine(object):
187
 
    """A simple class for OpenPGP symmetric encryption & decryption"""
188
 
 
189
 
    def __init__(self):
190
 
        self.tempdir = tempfile.mkdtemp(prefix="mandos-")
191
 
        self.gpg = "gpg"
192
 
        try:
193
 
            output = subprocess.check_output(["gpgconf"])
194
 
            for line in output.splitlines():
195
 
                name, text, path = line.split(b":")
196
 
                if name == "gpg":
197
 
                    self.gpg = path
198
 
                    break
199
 
        except OSError as e:
200
 
            if e.errno != errno.ENOENT:
201
 
                raise
202
 
        self.gnupgargs = ['--batch',
203
 
                          '--homedir', self.tempdir,
204
 
                          '--force-mdc',
205
 
                          '--quiet']
206
 
        # Only GPG version 1 has the --no-use-agent option.
207
 
        if self.gpg == "gpg" or self.gpg.endswith("/gpg"):
208
 
            self.gnupgargs.append("--no-use-agent")
209
 
 
210
 
    def __enter__(self):
211
 
        return self
212
 
 
213
 
    def __exit__(self, exc_type, exc_value, traceback):
214
 
        self._cleanup()
215
 
        return False
216
 
 
217
 
    def __del__(self):
218
 
        self._cleanup()
219
 
 
220
 
    def _cleanup(self):
221
 
        if self.tempdir is not None:
222
 
            # Delete contents of tempdir
223
 
            for root, dirs, files in os.walk(self.tempdir,
224
 
                                             topdown=False):
225
 
                for filename in files:
226
 
                    os.remove(os.path.join(root, filename))
227
 
                for dirname in dirs:
228
 
                    os.rmdir(os.path.join(root, dirname))
229
 
            # Remove tempdir
230
 
            os.rmdir(self.tempdir)
231
 
            self.tempdir = None
232
 
 
233
 
    def password_encode(self, password):
234
 
        # Passphrase can not be empty and can not contain newlines or
235
 
        # NUL bytes.  So we prefix it and hex encode it.
236
 
        encoded = b"mandos" + binascii.hexlify(password)
237
 
        if len(encoded) > 2048:
238
 
            # GnuPG can't handle long passwords, so encode differently
239
 
            encoded = (b"mandos" + password.replace(b"\\", b"\\\\")
240
 
                       .replace(b"\n", b"\\n")
241
 
                       .replace(b"\0", b"\\x00"))
242
 
        return encoded
243
 
 
244
 
    def encrypt(self, data, password):
245
 
        passphrase = self.password_encode(password)
246
 
        with tempfile.NamedTemporaryFile(
247
 
                dir=self.tempdir) as passfile:
248
 
            passfile.write(passphrase)
249
 
            passfile.flush()
250
 
            proc = subprocess.Popen([self.gpg, '--symmetric',
251
 
                                     '--passphrase-file',
252
 
                                     passfile.name]
253
 
                                    + self.gnupgargs,
254
 
                                    stdin=subprocess.PIPE,
255
 
                                    stdout=subprocess.PIPE,
256
 
                                    stderr=subprocess.PIPE)
257
 
            ciphertext, err = proc.communicate(input=data)
258
 
        if proc.returncode != 0:
259
 
            raise PGPError(err)
260
 
        return ciphertext
261
 
 
262
 
    def decrypt(self, data, password):
263
 
        passphrase = self.password_encode(password)
264
 
        with tempfile.NamedTemporaryFile(
265
 
                dir=self.tempdir) as passfile:
266
 
            passfile.write(passphrase)
267
 
            passfile.flush()
268
 
            proc = subprocess.Popen([self.gpg, '--decrypt',
269
 
                                     '--passphrase-file',
270
 
                                     passfile.name]
271
 
                                    + self.gnupgargs,
272
 
                                    stdin=subprocess.PIPE,
273
 
                                    stdout=subprocess.PIPE,
274
 
                                    stderr=subprocess.PIPE)
275
 
            decrypted_plaintext, err = proc.communicate(input=data)
276
 
        if proc.returncode != 0:
277
 
            raise PGPError(err)
278
 
        return decrypted_plaintext
279
 
 
280
 
 
281
 
# Pretend that we have an Avahi module
282
 
class avahi(object):
283
 
    """This isn't so much a class as it is a module-like namespace."""
284
 
    IF_UNSPEC = -1               # avahi-common/address.h
285
 
    PROTO_UNSPEC = -1            # avahi-common/address.h
286
 
    PROTO_INET = 0               # avahi-common/address.h
287
 
    PROTO_INET6 = 1              # avahi-common/address.h
288
 
    DBUS_NAME = "org.freedesktop.Avahi"
289
 
    DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"
290
 
    DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"
291
 
    DBUS_PATH_SERVER = "/"
292
 
 
293
 
    @staticmethod
294
 
    def string_array_to_txt_array(t):
295
 
        return dbus.Array((dbus.ByteArray(s.encode("utf-8"))
296
 
                           for s in t), signature="ay")
297
 
    ENTRY_GROUP_ESTABLISHED = 2  # avahi-common/defs.h
298
 
    ENTRY_GROUP_COLLISION = 3    # avahi-common/defs.h
299
 
    ENTRY_GROUP_FAILURE = 4      # avahi-common/defs.h
300
 
    SERVER_INVALID = 0           # avahi-common/defs.h
301
 
    SERVER_REGISTERING = 1       # avahi-common/defs.h
302
 
    SERVER_RUNNING = 2           # avahi-common/defs.h
303
 
    SERVER_COLLISION = 3         # avahi-common/defs.h
304
 
    SERVER_FAILURE = 4           # avahi-common/defs.h
 
63
 
 
64
# Brief description of the operation of this program:
 
65
 
66
# This server announces itself as a Zeroconf service.  Connecting
 
67
# clients use the TLS protocol, with the unusual quirk that this
 
68
# server program acts as a TLS "client" while a connecting client acts
 
69
# as a TLS "server".  The client (acting as a TLS "server") must
 
70
# supply an OpenPGP certificate, and the fingerprint of this
 
71
# certificate is used by this server to look up (in a list read from a
 
72
# file at start time) which binary blob to give the client.  No other
 
73
# authentication or authorization is done by this server.
 
74
 
 
75
 
 
76
logger = logging.Logger('mandos')
 
77
syslogger = logging.handlers.SysLogHandler\
 
78
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
 
79
syslogger.setFormatter(logging.Formatter\
 
80
                        ('%(levelname)s: %(message)s'))
 
81
logger.addHandler(syslogger)
 
82
del syslogger
305
83
 
306
84
 
307
85
class AvahiError(Exception):
308
 
    def __init__(self, value, *args, **kwargs):
 
86
    def __init__(self, value):
309
87
        self.value = value
310
 
        return super(AvahiError, self).__init__(value, *args,
311
 
                                                **kwargs)
312
 
 
 
88
    def __str__(self):
 
89
        return repr(self.value)
313
90
 
314
91
class AvahiServiceError(AvahiError):
315
92
    pass
316
93
 
317
 
 
318
94
class AvahiGroupError(AvahiError):
319
95
    pass
320
96
 
321
97
 
322
98
class AvahiService(object):
323
 
    """An Avahi (Zeroconf) service.
324
 
 
325
 
    Attributes:
 
99
    """
326
100
    interface: integer; avahi.IF_UNSPEC or an interface index.
327
101
               Used to optionally bind to the specified interface.
328
 
    name: string; Example: 'Mandos'
329
 
    type: string; Example: '_mandos._tcp'.
330
 
     See <https://www.iana.org/assignments/service-names-port-numbers>
331
 
    port: integer; what port to announce
332
 
    TXT: list of strings; TXT record for the service
333
 
    domain: string; Domain to publish on, default to .local if empty.
334
 
    host: string; Host to publish records for, default is localhost
335
 
    max_renames: integer; maximum number of renames
336
 
    rename_count: integer; counter so we only rename after collisions
337
 
                  a sensible number of times
338
 
    group: D-Bus Entry Group
339
 
    server: D-Bus Server
340
 
    bus: dbus.SystemBus()
 
102
    name = string; Example: "Mandos"
 
103
    type = string; Example: "_mandos._tcp".
 
104
                   See <http://www.dns-sd.org/ServiceTypes.html>
 
105
    port = integer; what port to announce
 
106
    TXT = list of strings; TXT record for the service
 
107
    domain = string; Domain to publish on, default to .local if empty.
 
108
    host = string; Host to publish records for, default to localhost
 
109
                   if empty.
 
110
    max_renames = integer; maximum number of renames
 
111
    rename_count = integer; counter so we only rename after collisions
 
112
                   a sensible number of times
341
113
    """
342
 
 
343
 
    def __init__(self,
344
 
                 interface=avahi.IF_UNSPEC,
345
 
                 name=None,
346
 
                 servicetype=None,
347
 
                 port=None,
348
 
                 TXT=None,
349
 
                 domain="",
350
 
                 host="",
351
 
                 max_renames=32768,
352
 
                 protocol=avahi.PROTO_UNSPEC,
353
 
                 bus=None):
 
114
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
 
115
                 type = None, port = None, TXT = None, domain = "",
 
116
                 host = "", max_renames = 12):
 
117
        """An Avahi (Zeroconf) service. """
354
118
        self.interface = interface
355
119
        self.name = name
356
 
        self.type = servicetype
 
120
        self.type = type
357
121
        self.port = port
358
 
        self.TXT = TXT if TXT is not None else []
 
122
        if TXT is None:
 
123
            self.TXT = []
 
124
        else:
 
125
            self.TXT = TXT
359
126
        self.domain = domain
360
127
        self.host = host
361
128
        self.rename_count = 0
362
 
        self.max_renames = max_renames
363
 
        self.protocol = protocol
364
 
        self.group = None       # our entry group
365
 
        self.server = None
366
 
        self.bus = bus
367
 
        self.entry_group_state_changed_match = None
368
 
 
369
 
    def rename(self, remove=True):
 
129
    def rename(self):
370
130
        """Derived from the Avahi example code"""
371
131
        if self.rename_count >= self.max_renames:
372
 
            logger.critical("No suitable Zeroconf service name found"
373
 
                            " after %i retries, exiting.",
374
 
                            self.rename_count)
 
132
            logger.critical(u"No suitable service name found after %i"
 
133
                            u" retries, exiting.", rename_count)
375
134
            raise AvahiServiceError("Too many renames")
376
 
        self.name = str(
377
 
            self.server.GetAlternativeServiceName(self.name))
 
135
        name = server.GetAlternativeServiceName(name)
 
136
        logger.notice(u"Changing name to %r ...", name)
 
137
        self.remove()
 
138
        self.add()
378
139
        self.rename_count += 1
379
 
        logger.info("Changing Zeroconf service name to %r ...",
380
 
                    self.name)
381
 
        if remove:
382
 
            self.remove()
383
 
        try:
384
 
            self.add()
385
 
        except dbus.exceptions.DBusException as error:
386
 
            if (error.get_dbus_name()
387
 
                == "org.freedesktop.Avahi.CollisionError"):
388
 
                logger.info("Local Zeroconf service name collision.")
389
 
                return self.rename(remove=False)
390
 
            else:
391
 
                logger.critical("D-Bus Exception", exc_info=error)
392
 
                self.cleanup()
393
 
                os._exit(1)
394
 
 
395
140
    def remove(self):
396
141
        """Derived from the Avahi example code"""
397
 
        if self.entry_group_state_changed_match is not None:
398
 
            self.entry_group_state_changed_match.remove()
399
 
            self.entry_group_state_changed_match = None
400
 
        if self.group is not None:
401
 
            self.group.Reset()
402
 
 
 
142
        if group is not None:
 
143
            group.Reset()
403
144
    def add(self):
404
145
        """Derived from the Avahi example code"""
405
 
        self.remove()
406
 
        if self.group is None:
407
 
            self.group = dbus.Interface(
408
 
                self.bus.get_object(avahi.DBUS_NAME,
409
 
                                    self.server.EntryGroupNew()),
410
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
411
 
        self.entry_group_state_changed_match = (
412
 
            self.group.connect_to_signal(
413
 
                'StateChanged', self.entry_group_state_changed))
414
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
415
 
                     self.name, self.type)
416
 
        self.group.AddService(
417
 
            self.interface,
418
 
            self.protocol,
419
 
            dbus.UInt32(0),     # flags
420
 
            self.name, self.type,
421
 
            self.domain, self.host,
422
 
            dbus.UInt16(self.port),
423
 
            avahi.string_array_to_txt_array(self.TXT))
424
 
        self.group.Commit()
425
 
 
426
 
    def entry_group_state_changed(self, state, error):
427
 
        """Derived from the Avahi example code"""
428
 
        logger.debug("Avahi entry group state change: %i", state)
429
 
 
430
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
431
 
            logger.debug("Zeroconf service established.")
432
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
433
 
            logger.info("Zeroconf service name collision.")
434
 
            self.rename()
435
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
436
 
            logger.critical("Avahi: Error in group state changed %s",
437
 
                            str(error))
438
 
            raise AvahiGroupError("State changed: {!s}".format(error))
439
 
 
440
 
    def cleanup(self):
441
 
        """Derived from the Avahi example code"""
442
 
        if self.group is not None:
443
 
            try:
444
 
                self.group.Free()
445
 
            except (dbus.exceptions.UnknownMethodException,
446
 
                    dbus.exceptions.DBusException):
447
 
                pass
448
 
            self.group = None
449
 
        self.remove()
450
 
 
451
 
    def server_state_changed(self, state, error=None):
452
 
        """Derived from the Avahi example code"""
453
 
        logger.debug("Avahi server state change: %i", state)
454
 
        bad_states = {
455
 
            avahi.SERVER_INVALID: "Zeroconf server invalid",
456
 
            avahi.SERVER_REGISTERING: None,
457
 
            avahi.SERVER_COLLISION: "Zeroconf server name collision",
458
 
            avahi.SERVER_FAILURE: "Zeroconf server failure",
459
 
        }
460
 
        if state in bad_states:
461
 
            if bad_states[state] is not None:
462
 
                if error is None:
463
 
                    logger.error(bad_states[state])
464
 
                else:
465
 
                    logger.error(bad_states[state] + ": %r", error)
466
 
            self.cleanup()
467
 
        elif state == avahi.SERVER_RUNNING:
468
 
            try:
469
 
                self.add()
470
 
            except dbus.exceptions.DBusException as error:
471
 
                if (error.get_dbus_name()
472
 
                    == "org.freedesktop.Avahi.CollisionError"):
473
 
                    logger.info("Local Zeroconf service name"
474
 
                                " collision.")
475
 
                    return self.rename(remove=False)
476
 
                else:
477
 
                    logger.critical("D-Bus Exception", exc_info=error)
478
 
                    self.cleanup()
479
 
                    os._exit(1)
480
 
        else:
481
 
            if error is None:
482
 
                logger.debug("Unknown state: %r", state)
483
 
            else:
484
 
                logger.debug("Unknown state: %r: %r", state, error)
485
 
 
486
 
    def activate(self):
487
 
        """Derived from the Avahi example code"""
488
 
        if self.server is None:
489
 
            self.server = dbus.Interface(
490
 
                self.bus.get_object(avahi.DBUS_NAME,
491
 
                                    avahi.DBUS_PATH_SERVER,
492
 
                                    follow_name_owner_changes=True),
493
 
                avahi.DBUS_INTERFACE_SERVER)
494
 
        self.server.connect_to_signal("StateChanged",
495
 
                                      self.server_state_changed)
496
 
        self.server_state_changed(self.server.GetState())
497
 
 
498
 
 
499
 
class AvahiServiceToSyslog(AvahiService):
500
 
    def rename(self, *args, **kwargs):
501
 
        """Add the new name to the syslog messages"""
502
 
        ret = super(AvahiServiceToSyslog, self).rename(*args, **kwargs)
503
 
        syslogger.setFormatter(logging.Formatter(
504
 
            'Mandos ({}) [%(process)d]: %(levelname)s: %(message)s'
505
 
            .format(self.name)))
506
 
        return ret
507
 
 
508
 
 
509
 
# Pretend that we have a GnuTLS module
510
 
class gnutls(object):
511
 
    """This isn't so much a class as it is a module-like namespace."""
512
 
 
513
 
    library = ctypes.util.find_library("gnutls")
514
 
    if library is None:
515
 
        library = ctypes.util.find_library("gnutls-deb0")
516
 
    _library = ctypes.cdll.LoadLibrary(library)
517
 
    del library
518
 
 
519
 
    # Unless otherwise indicated, the constants and types below are
520
 
    # all from the gnutls/gnutls.h C header file.
521
 
 
522
 
    # Constants
523
 
    E_SUCCESS = 0
524
 
    E_INTERRUPTED = -52
525
 
    E_AGAIN = -28
526
 
    CRT_OPENPGP = 2
527
 
    CRT_RAWPK = 3
528
 
    CLIENT = 2
529
 
    SHUT_RDWR = 0
530
 
    CRD_CERTIFICATE = 1
531
 
    E_NO_CERTIFICATE_FOUND = -49
532
 
    X509_FMT_DER = 0
533
 
    NO_TICKETS = 1<<10
534
 
    ENABLE_RAWPK = 1<<18
535
 
    CTYPE_PEERS = 3
536
 
    KEYID_USE_SHA256 = 1        # gnutls/x509.h
537
 
    OPENPGP_FMT_RAW = 0         # gnutls/openpgp.h
538
 
 
539
 
    # Types
540
 
    class session_int(ctypes.Structure):
541
 
        _fields_ = []
542
 
    session_t = ctypes.POINTER(session_int)
543
 
 
544
 
    class certificate_credentials_st(ctypes.Structure):
545
 
        _fields_ = []
546
 
    certificate_credentials_t = ctypes.POINTER(
547
 
        certificate_credentials_st)
548
 
    certificate_type_t = ctypes.c_int
549
 
 
550
 
    class datum_t(ctypes.Structure):
551
 
        _fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),
552
 
                    ('size', ctypes.c_uint)]
553
 
 
554
 
    class openpgp_crt_int(ctypes.Structure):
555
 
        _fields_ = []
556
 
    openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)
557
 
    openpgp_crt_fmt_t = ctypes.c_int  # gnutls/openpgp.h
558
 
    log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)
559
 
    credentials_type_t = ctypes.c_int
560
 
    transport_ptr_t = ctypes.c_void_p
561
 
    close_request_t = ctypes.c_int
562
 
 
563
 
    # Exceptions
564
 
    class Error(Exception):
565
 
        def __init__(self, message=None, code=None, args=()):
566
 
            # Default usage is by a message string, but if a return
567
 
            # code is passed, convert it to a string with
568
 
            # gnutls.strerror()
569
 
            self.code = code
570
 
            if message is None and code is not None:
571
 
                message = gnutls.strerror(code)
572
 
            return super(gnutls.Error, self).__init__(
573
 
                message, *args)
574
 
 
575
 
    class CertificateSecurityError(Error):
576
 
        pass
577
 
 
578
 
    # Classes
579
 
    class Credentials(object):
580
 
        def __init__(self):
581
 
            self._c_object = gnutls.certificate_credentials_t()
582
 
            gnutls.certificate_allocate_credentials(
583
 
                ctypes.byref(self._c_object))
584
 
            self.type = gnutls.CRD_CERTIFICATE
585
 
 
586
 
        def __del__(self):
587
 
            gnutls.certificate_free_credentials(self._c_object)
588
 
 
589
 
    class ClientSession(object):
590
 
        def __init__(self, socket, credentials=None):
591
 
            self._c_object = gnutls.session_t()
592
 
            gnutls_flags = gnutls.CLIENT
593
 
            if gnutls.check_version(b"3.5.6"):
594
 
                gnutls_flags |= gnutls.NO_TICKETS
595
 
            if gnutls.has_rawpk:
596
 
                gnutls_flags |= gnutls.ENABLE_RAWPK
597
 
            gnutls.init(ctypes.byref(self._c_object), gnutls_flags)
598
 
            del gnutls_flags
599
 
            gnutls.set_default_priority(self._c_object)
600
 
            gnutls.transport_set_ptr(self._c_object, socket.fileno())
601
 
            gnutls.handshake_set_private_extensions(self._c_object,
602
 
                                                    True)
603
 
            self.socket = socket
604
 
            if credentials is None:
605
 
                credentials = gnutls.Credentials()
606
 
            gnutls.credentials_set(self._c_object, credentials.type,
607
 
                                   ctypes.cast(credentials._c_object,
608
 
                                               ctypes.c_void_p))
609
 
            self.credentials = credentials
610
 
 
611
 
        def __del__(self):
612
 
            gnutls.deinit(self._c_object)
613
 
 
614
 
        def handshake(self):
615
 
            return gnutls.handshake(self._c_object)
616
 
 
617
 
        def send(self, data):
618
 
            data = bytes(data)
619
 
            data_len = len(data)
620
 
            while data_len > 0:
621
 
                data_len -= gnutls.record_send(self._c_object,
622
 
                                               data[-data_len:],
623
 
                                               data_len)
624
 
 
625
 
        def bye(self):
626
 
            return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)
627
 
 
628
 
    # Error handling functions
629
 
    def _error_code(result):
630
 
        """A function to raise exceptions on errors, suitable
631
 
        for the 'restype' attribute on ctypes functions"""
632
 
        if result >= 0:
633
 
            return result
634
 
        if result == gnutls.E_NO_CERTIFICATE_FOUND:
635
 
            raise gnutls.CertificateSecurityError(code=result)
636
 
        raise gnutls.Error(code=result)
637
 
 
638
 
    def _retry_on_error(result, func, arguments):
639
 
        """A function to retry on some errors, suitable
640
 
        for the 'errcheck' attribute on ctypes functions"""
641
 
        while result < 0:
642
 
            if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):
643
 
                return _error_code(result)
644
 
            result = func(*arguments)
645
 
        return result
646
 
 
647
 
    # Unless otherwise indicated, the function declarations below are
648
 
    # all from the gnutls/gnutls.h C header file.
649
 
 
650
 
    # Functions
651
 
    priority_set_direct = _library.gnutls_priority_set_direct
652
 
    priority_set_direct.argtypes = [session_t, ctypes.c_char_p,
653
 
                                    ctypes.POINTER(ctypes.c_char_p)]
654
 
    priority_set_direct.restype = _error_code
655
 
 
656
 
    init = _library.gnutls_init
657
 
    init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]
658
 
    init.restype = _error_code
659
 
 
660
 
    set_default_priority = _library.gnutls_set_default_priority
661
 
    set_default_priority.argtypes = [session_t]
662
 
    set_default_priority.restype = _error_code
663
 
 
664
 
    record_send = _library.gnutls_record_send
665
 
    record_send.argtypes = [session_t, ctypes.c_void_p,
666
 
                            ctypes.c_size_t]
667
 
    record_send.restype = ctypes.c_ssize_t
668
 
    record_send.errcheck = _retry_on_error
669
 
 
670
 
    certificate_allocate_credentials = (
671
 
        _library.gnutls_certificate_allocate_credentials)
672
 
    certificate_allocate_credentials.argtypes = [
673
 
        ctypes.POINTER(certificate_credentials_t)]
674
 
    certificate_allocate_credentials.restype = _error_code
675
 
 
676
 
    certificate_free_credentials = (
677
 
        _library.gnutls_certificate_free_credentials)
678
 
    certificate_free_credentials.argtypes = [
679
 
        certificate_credentials_t]
680
 
    certificate_free_credentials.restype = None
681
 
 
682
 
    handshake_set_private_extensions = (
683
 
        _library.gnutls_handshake_set_private_extensions)
684
 
    handshake_set_private_extensions.argtypes = [session_t,
685
 
                                                 ctypes.c_int]
686
 
    handshake_set_private_extensions.restype = None
687
 
 
688
 
    credentials_set = _library.gnutls_credentials_set
689
 
    credentials_set.argtypes = [session_t, credentials_type_t,
690
 
                                ctypes.c_void_p]
691
 
    credentials_set.restype = _error_code
692
 
 
693
 
    strerror = _library.gnutls_strerror
694
 
    strerror.argtypes = [ctypes.c_int]
695
 
    strerror.restype = ctypes.c_char_p
696
 
 
697
 
    certificate_type_get = _library.gnutls_certificate_type_get
698
 
    certificate_type_get.argtypes = [session_t]
699
 
    certificate_type_get.restype = _error_code
700
 
 
701
 
    certificate_get_peers = _library.gnutls_certificate_get_peers
702
 
    certificate_get_peers.argtypes = [session_t,
703
 
                                      ctypes.POINTER(ctypes.c_uint)]
704
 
    certificate_get_peers.restype = ctypes.POINTER(datum_t)
705
 
 
706
 
    global_set_log_level = _library.gnutls_global_set_log_level
707
 
    global_set_log_level.argtypes = [ctypes.c_int]
708
 
    global_set_log_level.restype = None
709
 
 
710
 
    global_set_log_function = _library.gnutls_global_set_log_function
711
 
    global_set_log_function.argtypes = [log_func]
712
 
    global_set_log_function.restype = None
713
 
 
714
 
    deinit = _library.gnutls_deinit
715
 
    deinit.argtypes = [session_t]
716
 
    deinit.restype = None
717
 
 
718
 
    handshake = _library.gnutls_handshake
719
 
    handshake.argtypes = [session_t]
720
 
    handshake.restype = _error_code
721
 
    handshake.errcheck = _retry_on_error
722
 
 
723
 
    transport_set_ptr = _library.gnutls_transport_set_ptr
724
 
    transport_set_ptr.argtypes = [session_t, transport_ptr_t]
725
 
    transport_set_ptr.restype = None
726
 
 
727
 
    bye = _library.gnutls_bye
728
 
    bye.argtypes = [session_t, close_request_t]
729
 
    bye.restype = _error_code
730
 
    bye.errcheck = _retry_on_error
731
 
 
732
 
    check_version = _library.gnutls_check_version
733
 
    check_version.argtypes = [ctypes.c_char_p]
734
 
    check_version.restype = ctypes.c_char_p
735
 
 
736
 
    _need_version = b"3.3.0"
737
 
    if check_version(_need_version) is None:
738
 
        raise self.Error("Needs GnuTLS {} or later"
739
 
                         .format(_need_version))
740
 
 
741
 
    _tls_rawpk_version = b"3.6.6"
742
 
    has_rawpk = bool(check_version(_tls_rawpk_version))
743
 
 
744
 
    if has_rawpk:
745
 
        # Types
746
 
        class pubkey_st(ctypes.Structure):
747
 
            _fields = []
748
 
        pubkey_t = ctypes.POINTER(pubkey_st)
749
 
 
750
 
        x509_crt_fmt_t = ctypes.c_int
751
 
 
752
 
        # All the function declarations below are from gnutls/abstract.h
753
 
        pubkey_init = _library.gnutls_pubkey_init
754
 
        pubkey_init.argtypes = [ctypes.POINTER(pubkey_t)]
755
 
        pubkey_init.restype = _error_code
756
 
 
757
 
        pubkey_import = _library.gnutls_pubkey_import
758
 
        pubkey_import.argtypes = [pubkey_t, ctypes.POINTER(datum_t),
759
 
                                  x509_crt_fmt_t]
760
 
        pubkey_import.restype = _error_code
761
 
 
762
 
        pubkey_get_key_id = _library.gnutls_pubkey_get_key_id
763
 
        pubkey_get_key_id.argtypes = [pubkey_t, ctypes.c_int,
764
 
                                      ctypes.POINTER(ctypes.c_ubyte),
765
 
                                      ctypes.POINTER(ctypes.c_size_t)]
766
 
        pubkey_get_key_id.restype = _error_code
767
 
 
768
 
        pubkey_deinit = _library.gnutls_pubkey_deinit
769
 
        pubkey_deinit.argtypes = [pubkey_t]
770
 
        pubkey_deinit.restype = None
771
 
    else:
772
 
        # All the function declarations below are from gnutls/openpgp.h
773
 
 
774
 
        openpgp_crt_init = _library.gnutls_openpgp_crt_init
775
 
        openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]
776
 
        openpgp_crt_init.restype = _error_code
777
 
 
778
 
        openpgp_crt_import = _library.gnutls_openpgp_crt_import
779
 
        openpgp_crt_import.argtypes = [openpgp_crt_t,
780
 
                                       ctypes.POINTER(datum_t),
781
 
                                       openpgp_crt_fmt_t]
782
 
        openpgp_crt_import.restype = _error_code
783
 
 
784
 
        openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self
785
 
        openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,
786
 
                                            ctypes.POINTER(ctypes.c_uint)]
787
 
        openpgp_crt_verify_self.restype = _error_code
788
 
 
789
 
        openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit
790
 
        openpgp_crt_deinit.argtypes = [openpgp_crt_t]
791
 
        openpgp_crt_deinit.restype = None
792
 
 
793
 
        openpgp_crt_get_fingerprint = (
794
 
            _library.gnutls_openpgp_crt_get_fingerprint)
795
 
        openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,
796
 
                                                ctypes.c_void_p,
797
 
                                                ctypes.POINTER(
798
 
                                                    ctypes.c_size_t)]
799
 
        openpgp_crt_get_fingerprint.restype = _error_code
800
 
 
801
 
    if check_version(b"3.6.4"):
802
 
        certificate_type_get2 = _library.gnutls_certificate_type_get2
803
 
        certificate_type_get2.argtypes = [session_t, ctypes.c_int]
804
 
        certificate_type_get2.restype = _error_code
805
 
 
806
 
    # Remove non-public functions
807
 
    del _error_code, _retry_on_error
808
 
 
809
 
 
810
 
def call_pipe(connection,       # : multiprocessing.Connection
811
 
              func, *args, **kwargs):
812
 
    """This function is meant to be called by multiprocessing.Process
813
 
 
814
 
    This function runs func(*args, **kwargs), and writes the resulting
815
 
    return value on the provided multiprocessing.Connection.
816
 
    """
817
 
    connection.send(func(*args, **kwargs))
818
 
    connection.close()
 
146
        global group
 
147
        if group is None:
 
148
            group = dbus.Interface\
 
149
                    (bus.get_object(avahi.DBUS_NAME,
 
150
                                    server.EntryGroupNew()),
 
151
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
152
            group.connect_to_signal('StateChanged',
 
153
                                    entry_group_state_changed)
 
154
        logger.debug(u"Adding service '%s' of type '%s' ...",
 
155
                     service.name, service.type)
 
156
        group.AddService(
 
157
                self.interface,         # interface
 
158
                avahi.PROTO_INET6,      # protocol
 
159
                dbus.UInt32(0),         # flags
 
160
                self.name, self.type,
 
161
                self.domain, self.host,
 
162
                dbus.UInt16(self.port),
 
163
                avahi.string_array_to_txt_array(self.TXT))
 
164
        group.Commit()
 
165
 
 
166
# From the Avahi example code:
 
167
group = None                            # our entry group
 
168
# End of Avahi example code
819
169
 
820
170
 
821
171
class Client(object):
822
172
    """A representation of a client host served by this server.
823
 
 
824
173
    Attributes:
825
 
    approved:   bool(); 'None' if not yet approved/disapproved
826
 
    approval_delay: datetime.timedelta(); Time to wait for approval
827
 
    approval_duration: datetime.timedelta(); Duration of one approval
828
 
    checker: multiprocessing.Process(); a running checker process used
829
 
             to see if the client lives. 'None' if no process is
830
 
             running.
831
 
    checker_callback_tag: a GLib event source tag, or None
832
 
    checker_command: string; External command which is run to check
833
 
                     if client lives.  %() expansions are done at
 
174
    name:      string; from the config file, used in log messages
 
175
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
176
                 uniquely identify the client
 
177
    secret:    bytestring; sent verbatim (over TLS) to client
 
178
    fqdn:      string (FQDN); available for use by the checker command
 
179
    created:   datetime.datetime(); object creation, not client host
 
180
    last_checked_ok: datetime.datetime() or None if not yet checked OK
 
181
    timeout:   datetime.timedelta(); How long from last_checked_ok
 
182
                                     until this client is invalid
 
183
    interval:  datetime.timedelta(); How often to start a new checker
 
184
    stop_hook: If set, called by stop() as stop_hook(self)
 
185
    checker:   subprocess.Popen(); a running checker process used
 
186
                                   to see if the client lives.
 
187
                                   'None' if no process is running.
 
188
    checker_initiator_tag: a gobject event source tag, or None
 
189
    stop_initiator_tag:    - '' -
 
190
    checker_callback_tag:  - '' -
 
191
    checker_command: string; External command which is run to check if
 
192
                     client lives.  %() expansions are done at
834
193
                     runtime with vars(self) as dict, so that for
835
194
                     instance %(name)s can be used in the command.
836
 
    checker_initiator_tag: a GLib event source tag, or None
837
 
    created:    datetime.datetime(); (UTC) object creation
838
 
    client_structure: Object describing what attributes a client has
839
 
                      and is used for storing the client at exit
840
 
    current_checker_command: string; current running checker_command
841
 
    disable_initiator_tag: a GLib event source tag, or None
842
 
    enabled:    bool()
843
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
844
 
                 uniquely identify an OpenPGP client
845
 
    key_id: string (64 hexadecimal digits); used to uniquely identify
846
 
            a client using raw public keys
847
 
    host:       string; available for use by the checker command
848
 
    interval:   datetime.timedelta(); How often to start a new checker
849
 
    last_approval_request: datetime.datetime(); (UTC) or None
850
 
    last_checked_ok: datetime.datetime(); (UTC) or None
851
 
    last_checker_status: integer between 0 and 255 reflecting exit
852
 
                         status of last checker. -1 reflects crashed
853
 
                         checker, -2 means no checker completed yet.
854
 
    last_checker_signal: The signal which killed the last checker, if
855
 
                         last_checker_status is -1
856
 
    last_enabled: datetime.datetime(); (UTC) or None
857
 
    name:       string; from the config file, used in log messages and
858
 
                        D-Bus identifiers
859
 
    secret:     bytestring; sent verbatim (over TLS) to client
860
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
861
 
                                      until this client is disabled
862
 
    extended_timeout:   extra long timeout when secret has been sent
863
 
    runtime_expansions: Allowed attributes for runtime expansion.
864
 
    expires:    datetime.datetime(); time (UTC) when a client will be
865
 
                disabled, or None
866
 
    server_settings: The server_settings dict from main()
 
195
    Private attibutes:
 
196
    _timeout: Real variable for 'timeout'
 
197
    _interval: Real variable for 'interval'
 
198
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
199
    _interval_milliseconds: - '' -
867
200
    """
868
 
 
869
 
    runtime_expansions = ("approval_delay", "approval_duration",
870
 
                          "created", "enabled", "expires", "key_id",
871
 
                          "fingerprint", "host", "interval",
872
 
                          "last_approval_request", "last_checked_ok",
873
 
                          "last_enabled", "name", "timeout")
874
 
    client_defaults = {
875
 
        "timeout": "PT5M",
876
 
        "extended_timeout": "PT15M",
877
 
        "interval": "PT2M",
878
 
        "checker": "fping -q -- %%(host)s",
879
 
        "host": "",
880
 
        "approval_delay": "PT0S",
881
 
        "approval_duration": "PT1S",
882
 
        "approved_by_default": "True",
883
 
        "enabled": "True",
884
 
    }
885
 
 
886
 
    @staticmethod
887
 
    def config_parser(config):
888
 
        """Construct a new dict of client settings of this form:
889
 
        { client_name: {setting_name: value, ...}, ...}
890
 
        with exceptions for any special settings as defined above.
891
 
        NOTE: Must be a pure function. Must return the same result
892
 
        value given the same arguments.
893
 
        """
894
 
        settings = {}
895
 
        for client_name in config.sections():
896
 
            section = dict(config.items(client_name))
897
 
            client = settings[client_name] = {}
898
 
 
899
 
            client["host"] = section["host"]
900
 
            # Reformat values from string types to Python types
901
 
            client["approved_by_default"] = config.getboolean(
902
 
                client_name, "approved_by_default")
903
 
            client["enabled"] = config.getboolean(client_name,
904
 
                                                  "enabled")
905
 
 
906
 
            # Uppercase and remove spaces from key_id and fingerprint
907
 
            # for later comparison purposes with return value from the
908
 
            # key_id() and fingerprint() functions
909
 
            client["key_id"] = (section.get("key_id", "").upper()
910
 
                                .replace(" ", ""))
911
 
            client["fingerprint"] = (section["fingerprint"].upper()
912
 
                                     .replace(" ", ""))
913
 
            if "secret" in section:
914
 
                client["secret"] = codecs.decode(section["secret"]
915
 
                                                 .encode("utf-8"),
916
 
                                                 "base64")
917
 
            elif "secfile" in section:
918
 
                with open(os.path.expanduser(os.path.expandvars
919
 
                                             (section["secfile"])),
920
 
                          "rb") as secfile:
921
 
                    client["secret"] = secfile.read()
922
 
            else:
923
 
                raise TypeError("No secret or secfile for section {}"
924
 
                                .format(section))
925
 
            client["timeout"] = string_to_delta(section["timeout"])
926
 
            client["extended_timeout"] = string_to_delta(
927
 
                section["extended_timeout"])
928
 
            client["interval"] = string_to_delta(section["interval"])
929
 
            client["approval_delay"] = string_to_delta(
930
 
                section["approval_delay"])
931
 
            client["approval_duration"] = string_to_delta(
932
 
                section["approval_duration"])
933
 
            client["checker_command"] = section["checker"]
934
 
            client["last_approval_request"] = None
935
 
            client["last_checked_ok"] = None
936
 
            client["last_checker_status"] = -2
937
 
 
938
 
        return settings
939
 
 
940
 
    def __init__(self, settings, name=None, server_settings=None):
 
201
    def _set_timeout(self, timeout):
 
202
        "Setter function for 'timeout' attribute"
 
203
        self._timeout = timeout
 
204
        self._timeout_milliseconds = ((self.timeout.days
 
205
                                       * 24 * 60 * 60 * 1000)
 
206
                                      + (self.timeout.seconds * 1000)
 
207
                                      + (self.timeout.microseconds
 
208
                                         // 1000))
 
209
    timeout = property(lambda self: self._timeout,
 
210
                       _set_timeout)
 
211
    del _set_timeout
 
212
    def _set_interval(self, interval):
 
213
        "Setter function for 'interval' attribute"
 
214
        self._interval = interval
 
215
        self._interval_milliseconds = ((self.interval.days
 
216
                                        * 24 * 60 * 60 * 1000)
 
217
                                       + (self.interval.seconds
 
218
                                          * 1000)
 
219
                                       + (self.interval.microseconds
 
220
                                          // 1000))
 
221
    interval = property(lambda self: self._interval,
 
222
                        _set_interval)
 
223
    del _set_interval
 
224
    def __init__(self, name=None, stop_hook=None, fingerprint=None,
 
225
                 secret=None, secfile=None, fqdn=None, timeout=None,
 
226
                 interval=-1, checker=None):
 
227
        """Note: the 'checker' argument sets the 'checker_command'
 
228
        attribute and not the 'checker' attribute.."""
941
229
        self.name = name
942
 
        if server_settings is None:
943
 
            server_settings = {}
944
 
        self.server_settings = server_settings
945
 
        # adding all client settings
946
 
        for setting, value in settings.items():
947
 
            setattr(self, setting, value)
948
 
 
949
 
        if self.enabled:
950
 
            if not hasattr(self, "last_enabled"):
951
 
                self.last_enabled = datetime.datetime.utcnow()
952
 
            if not hasattr(self, "expires"):
953
 
                self.expires = (datetime.datetime.utcnow()
954
 
                                + self.timeout)
 
230
        logger.debug(u"Creating client %r", self.name)
 
231
        # Uppercase and remove spaces from fingerprint
 
232
        # for later comparison purposes with return value of
 
233
        # the fingerprint() function
 
234
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
235
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
 
236
        if secret:
 
237
            self.secret = secret.decode(u"base64")
 
238
        elif secfile:
 
239
            sf = open(secfile)
 
240
            self.secret = sf.read()
 
241
            sf.close()
955
242
        else:
956
 
            self.last_enabled = None
957
 
            self.expires = None
958
 
 
959
 
        logger.debug("Creating client %r", self.name)
960
 
        logger.debug("  Key ID: %s", self.key_id)
961
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
962
 
        self.created = settings.get("created",
963
 
                                    datetime.datetime.utcnow())
964
 
 
965
 
        # attributes specific for this server instance
 
243
            raise TypeError(u"No secret or secfile for client %s"
 
244
                            % self.name)
 
245
        self.fqdn = fqdn
 
246
        self.created = datetime.datetime.now()
 
247
        self.last_checked_ok = None
 
248
        self.timeout = string_to_delta(timeout)
 
249
        self.interval = string_to_delta(interval)
 
250
        self.stop_hook = stop_hook
966
251
        self.checker = None
967
252
        self.checker_initiator_tag = None
968
 
        self.disable_initiator_tag = None
 
253
        self.stop_initiator_tag = None
969
254
        self.checker_callback_tag = None
970
 
        self.current_checker_command = None
971
 
        self.approved = None
972
 
        self.approvals_pending = 0
973
 
        self.changedstate = multiprocessing_manager.Condition(
974
 
            multiprocessing_manager.Lock())
975
 
        self.client_structure = [attr
976
 
                                 for attr in self.__dict__.keys()
977
 
                                 if not attr.startswith("_")]
978
 
        self.client_structure.append("client_structure")
979
 
 
980
 
        for name, t in inspect.getmembers(
981
 
                type(self), lambda obj: isinstance(obj, property)):
982
 
            if not name.startswith("_"):
983
 
                self.client_structure.append(name)
984
 
 
985
 
    # Send notice to process children that client state has changed
986
 
    def send_changedstate(self):
987
 
        with self.changedstate:
988
 
            self.changedstate.notify_all()
989
 
 
990
 
    def enable(self):
 
255
        self.check_command = checker
 
256
    def start(self):
991
257
        """Start this client's checker and timeout hooks"""
992
 
        if getattr(self, "enabled", False):
993
 
            # Already enabled
994
 
            return
995
 
        self.expires = datetime.datetime.utcnow() + self.timeout
996
 
        self.enabled = True
997
 
        self.last_enabled = datetime.datetime.utcnow()
998
 
        self.init_checker()
999
 
        self.send_changedstate()
1000
 
 
1001
 
    def disable(self, quiet=True):
1002
 
        """Disable this client."""
1003
 
        if not getattr(self, "enabled", False):
1004
 
            return False
1005
 
        if not quiet:
1006
 
            logger.info("Disabling client %s", self.name)
1007
 
        if getattr(self, "disable_initiator_tag", None) is not None:
1008
 
            GLib.source_remove(self.disable_initiator_tag)
1009
 
            self.disable_initiator_tag = None
1010
 
        self.expires = None
1011
 
        if getattr(self, "checker_initiator_tag", None) is not None:
1012
 
            GLib.source_remove(self.checker_initiator_tag)
1013
 
            self.checker_initiator_tag = None
1014
 
        self.stop_checker()
1015
 
        self.enabled = False
1016
 
        if not quiet:
1017
 
            self.send_changedstate()
1018
 
        # Do not run this again if called by a GLib.timeout_add
1019
 
        return False
1020
 
 
1021
 
    def __del__(self):
1022
 
        self.disable()
1023
 
 
1024
 
    def init_checker(self):
1025
258
        # Schedule a new checker to be started an 'interval' from now,
1026
259
        # and every interval from then on.
1027
 
        if self.checker_initiator_tag is not None:
1028
 
            GLib.source_remove(self.checker_initiator_tag)
1029
 
        self.checker_initiator_tag = GLib.timeout_add(
1030
 
            int(self.interval.total_seconds() * 1000),
1031
 
            self.start_checker)
1032
 
        # Schedule a disable() when 'timeout' has passed
1033
 
        if self.disable_initiator_tag is not None:
1034
 
            GLib.source_remove(self.disable_initiator_tag)
1035
 
        self.disable_initiator_tag = GLib.timeout_add(
1036
 
            int(self.timeout.total_seconds() * 1000), self.disable)
 
260
        self.checker_initiator_tag = gobject.timeout_add\
 
261
                                     (self._interval_milliseconds,
 
262
                                      self.start_checker)
1037
263
        # Also start a new checker *right now*.
1038
264
        self.start_checker()
1039
 
 
1040
 
    def checker_callback(self, source, condition, connection,
1041
 
                         command):
 
265
        # Schedule a stop() when 'timeout' has passed
 
266
        self.stop_initiator_tag = gobject.timeout_add\
 
267
                                  (self._timeout_milliseconds,
 
268
                                   self.stop)
 
269
    def stop(self):
 
270
        """Stop this client.
 
271
        The possibility that a client might be restarted is left open,
 
272
        but not currently used."""
 
273
        # If this client doesn't have a secret, it is already stopped.
 
274
        if self.secret:
 
275
            logger.debug(u"Stopping client %s", self.name)
 
276
            self.secret = None
 
277
        else:
 
278
            return False
 
279
        if getattr(self, "stop_initiator_tag", False):
 
280
            gobject.source_remove(self.stop_initiator_tag)
 
281
            self.stop_initiator_tag = None
 
282
        if getattr(self, "checker_initiator_tag", False):
 
283
            gobject.source_remove(self.checker_initiator_tag)
 
284
            self.checker_initiator_tag = None
 
285
        self.stop_checker()
 
286
        if self.stop_hook:
 
287
            self.stop_hook(self)
 
288
        # Do not run this again if called by a gobject.timeout_add
 
289
        return False
 
290
    def __del__(self):
 
291
        self.stop_hook = None
 
292
        self.stop()
 
293
    def checker_callback(self, pid, condition):
1042
294
        """The checker has completed, so take appropriate actions."""
1043
 
        # Read return code from connection (see call_pipe)
1044
 
        returncode = connection.recv()
1045
 
        connection.close()
1046
 
        self.checker.join()
 
295
        now = datetime.datetime.now()
1047
296
        self.checker_callback_tag = None
1048
297
        self.checker = None
1049
 
 
1050
 
        if returncode >= 0:
1051
 
            self.last_checker_status = returncode
1052
 
            self.last_checker_signal = None
1053
 
            if self.last_checker_status == 0:
1054
 
                logger.info("Checker for %(name)s succeeded",
1055
 
                            vars(self))
1056
 
                self.checked_ok()
1057
 
            else:
1058
 
                logger.info("Checker for %(name)s failed", vars(self))
1059
 
        else:
1060
 
            self.last_checker_status = -1
1061
 
            self.last_checker_signal = -returncode
1062
 
            logger.warning("Checker for %(name)s crashed?",
 
298
        if os.WIFEXITED(condition) \
 
299
               and (os.WEXITSTATUS(condition) == 0):
 
300
            logger.debug(u"Checker for %(name)s succeeded",
 
301
                         vars(self))
 
302
            self.last_checked_ok = now
 
303
            gobject.source_remove(self.stop_initiator_tag)
 
304
            self.stop_initiator_tag = gobject.timeout_add\
 
305
                                      (self._timeout_milliseconds,
 
306
                                       self.stop)
 
307
        elif not os.WIFEXITED(condition):
 
308
            logger.warning(u"Checker for %(name)s crashed?",
1063
309
                           vars(self))
1064
 
        return False
1065
 
 
1066
 
    def checked_ok(self):
1067
 
        """Assert that the client has been seen, alive and well."""
1068
 
        self.last_checked_ok = datetime.datetime.utcnow()
1069
 
        self.last_checker_status = 0
1070
 
        self.last_checker_signal = None
1071
 
        self.bump_timeout()
1072
 
 
1073
 
    def bump_timeout(self, timeout=None):
1074
 
        """Bump up the timeout for this client."""
1075
 
        if timeout is None:
1076
 
            timeout = self.timeout
1077
 
        if self.disable_initiator_tag is not None:
1078
 
            GLib.source_remove(self.disable_initiator_tag)
1079
 
            self.disable_initiator_tag = None
1080
 
        if getattr(self, "enabled", False):
1081
 
            self.disable_initiator_tag = GLib.timeout_add(
1082
 
                int(timeout.total_seconds() * 1000), self.disable)
1083
 
            self.expires = datetime.datetime.utcnow() + timeout
1084
 
 
1085
 
    def need_approval(self):
1086
 
        self.last_approval_request = datetime.datetime.utcnow()
1087
 
 
 
310
        else:
 
311
            logger.debug(u"Checker for %(name)s failed",
 
312
                         vars(self))
1088
313
    def start_checker(self):
1089
314
        """Start a new checker subprocess if one is not running.
1090
 
 
1091
315
        If a checker already exists, leave it running and do
1092
316
        nothing."""
1093
317
        # The reason for not killing a running checker is that if we
1094
 
        # did that, and if a checker (for some reason) started running
1095
 
        # slowly and taking more than 'interval' time, then the client
1096
 
        # would inevitably timeout, since no checker would get a
1097
 
        # chance to run to completion.  If we instead leave running
 
318
        # did that, then if a checker (for some reason) started
 
319
        # running slowly and taking more than 'interval' time, the
 
320
        # client would inevitably timeout, since no checker would get
 
321
        # a chance to run to completion.  If we instead leave running
1098
322
        # checkers alone, the checker would have to take more time
1099
 
        # than 'timeout' for the client to be disabled, which is as it
1100
 
        # should be.
1101
 
 
1102
 
        if self.checker is not None and not self.checker.is_alive():
1103
 
            logger.warning("Checker was not alive; joining")
1104
 
            self.checker.join()
1105
 
            self.checker = None
1106
 
        # Start a new checker if needed
 
323
        # than 'timeout' for the client to be declared invalid, which
 
324
        # is as it should be.
1107
325
        if self.checker is None:
1108
 
            # Escape attributes for the shell
1109
 
            escaped_attrs = {
1110
 
                attr: re.escape(str(getattr(self, attr)))
1111
 
                for attr in self.runtime_expansions}
1112
 
            try:
1113
 
                command = self.checker_command % escaped_attrs
1114
 
            except TypeError as error:
1115
 
                logger.error('Could not format string "%s"',
1116
 
                             self.checker_command,
1117
 
                             exc_info=error)
1118
 
                return True     # Try again later
1119
 
            self.current_checker_command = command
1120
 
            logger.info("Starting checker %r for %s", command,
1121
 
                        self.name)
1122
 
            # We don't need to redirect stdout and stderr, since
1123
 
            # in normal mode, that is already done by daemon(),
1124
 
            # and in debug mode we don't want to.  (Stdin is
1125
 
            # always replaced by /dev/null.)
1126
 
            # The exception is when not debugging but nevertheless
1127
 
            # running in the foreground; use the previously
1128
 
            # created wnull.
1129
 
            popen_args = {"close_fds": True,
1130
 
                          "shell": True,
1131
 
                          "cwd": "/"}
1132
 
            if (not self.server_settings["debug"]
1133
 
                and self.server_settings["foreground"]):
1134
 
                popen_args.update({"stdout": wnull,
1135
 
                                   "stderr": wnull})
1136
 
            pipe = multiprocessing.Pipe(duplex=False)
1137
 
            self.checker = multiprocessing.Process(
1138
 
                target=call_pipe,
1139
 
                args=(pipe[1], subprocess.call, command),
1140
 
                kwargs=popen_args)
1141
 
            self.checker.start()
1142
 
            self.checker_callback_tag = GLib.io_add_watch(
1143
 
                pipe[0].fileno(), GLib.IO_IN,
1144
 
                self.checker_callback, pipe[0], command)
1145
 
        # Re-run this periodically if run by GLib.timeout_add
 
326
            try:
 
327
                # In case check_command has exactly one % operator
 
328
                command = self.check_command % self.fqdn
 
329
            except TypeError:
 
330
                # Escape attributes for the shell
 
331
                escaped_attrs = dict((key, re.escape(str(val)))
 
332
                                     for key, val in
 
333
                                     vars(self).iteritems())
 
334
                try:
 
335
                    command = self.check_command % escaped_attrs
 
336
                except TypeError, error:
 
337
                    logger.error(u'Could not format string "%s":'
 
338
                                 u' %s', self.check_command, error)
 
339
                    return True # Try again later
 
340
            try:
 
341
                logger.debug(u"Starting checker %r for %s",
 
342
                             command, self.name)
 
343
                self.checker = subprocess.Popen(command,
 
344
                                                close_fds=True,
 
345
                                                shell=True, cwd="/")
 
346
                self.checker_callback_tag = gobject.child_watch_add\
 
347
                                            (self.checker.pid,
 
348
                                             self.checker_callback)
 
349
            except subprocess.OSError, error:
 
350
                logger.error(u"Failed to start subprocess: %s",
 
351
                             error)
 
352
        # Re-run this periodically if run by gobject.timeout_add
1146
353
        return True
1147
 
 
1148
354
    def stop_checker(self):
1149
355
        """Force the checker process, if any, to stop."""
1150
356
        if self.checker_callback_tag:
1151
 
            GLib.source_remove(self.checker_callback_tag)
 
357
            gobject.source_remove(self.checker_callback_tag)
1152
358
            self.checker_callback_tag = None
1153
359
        if getattr(self, "checker", None) is None:
1154
360
            return
1155
361
        logger.debug("Stopping checker for %(name)s", vars(self))
1156
 
        self.checker.terminate()
 
362
        try:
 
363
            os.kill(self.checker.pid, signal.SIGTERM)
 
364
            #os.sleep(0.5)
 
365
            #if self.checker.poll() is None:
 
366
            #    os.kill(self.checker.pid, signal.SIGKILL)
 
367
        except OSError, error:
 
368
            if error.errno != errno.ESRCH: # No such process
 
369
                raise
1157
370
        self.checker = None
1158
 
 
1159
 
 
1160
 
def dbus_service_property(dbus_interface,
1161
 
                          signature="v",
1162
 
                          access="readwrite",
1163
 
                          byte_arrays=False):
1164
 
    """Decorators for marking methods of a DBusObjectWithProperties to
1165
 
    become properties on the D-Bus.
1166
 
 
1167
 
    The decorated method will be called with no arguments by "Get"
1168
 
    and with one argument by "Set".
1169
 
 
1170
 
    The parameters, where they are supported, are the same as
1171
 
    dbus.service.method, except there is only "signature", since the
1172
 
    type from Get() and the type sent to Set() is the same.
1173
 
    """
1174
 
    # Encoding deeply encoded byte arrays is not supported yet by the
1175
 
    # "Set" method, so we fail early here:
1176
 
    if byte_arrays and signature != "ay":
1177
 
        raise ValueError("Byte arrays not supported for non-'ay'"
1178
 
                         " signature {!r}".format(signature))
1179
 
 
1180
 
    def decorator(func):
1181
 
        func._dbus_is_property = True
1182
 
        func._dbus_interface = dbus_interface
1183
 
        func._dbus_signature = signature
1184
 
        func._dbus_access = access
1185
 
        func._dbus_name = func.__name__
1186
 
        if func._dbus_name.endswith("_dbus_property"):
1187
 
            func._dbus_name = func._dbus_name[:-14]
1188
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays}
1189
 
        return func
1190
 
 
1191
 
    return decorator
1192
 
 
1193
 
 
1194
 
def dbus_interface_annotations(dbus_interface):
1195
 
    """Decorator for marking functions returning interface annotations
1196
 
 
1197
 
    Usage:
1198
 
 
1199
 
    @dbus_interface_annotations("org.example.Interface")
1200
 
    def _foo(self):  # Function name does not matter
1201
 
        return {"org.freedesktop.DBus.Deprecated": "true",
1202
 
                "org.freedesktop.DBus.Property.EmitsChangedSignal":
1203
 
                    "false"}
1204
 
    """
1205
 
 
1206
 
    def decorator(func):
1207
 
        func._dbus_is_interface = True
1208
 
        func._dbus_interface = dbus_interface
1209
 
        func._dbus_name = dbus_interface
1210
 
        return func
1211
 
 
1212
 
    return decorator
1213
 
 
1214
 
 
1215
 
def dbus_annotations(annotations):
1216
 
    """Decorator to annotate D-Bus methods, signals or properties
1217
 
    Usage:
1218
 
 
1219
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true",
1220
 
                       "org.freedesktop.DBus.Property."
1221
 
                       "EmitsChangedSignal": "false"})
1222
 
    @dbus_service_property("org.example.Interface", signature="b",
1223
 
                           access="r")
1224
 
    def Property_dbus_property(self):
1225
 
        return dbus.Boolean(False)
1226
 
 
1227
 
    See also the DBusObjectWithAnnotations class.
1228
 
    """
1229
 
 
1230
 
    def decorator(func):
1231
 
        func._dbus_annotations = annotations
1232
 
        return func
1233
 
 
1234
 
    return decorator
1235
 
 
1236
 
 
1237
 
class DBusPropertyException(dbus.exceptions.DBusException):
1238
 
    """A base class for D-Bus property-related exceptions
1239
 
    """
1240
 
    pass
1241
 
 
1242
 
 
1243
 
class DBusPropertyAccessException(DBusPropertyException):
1244
 
    """A property's access permissions disallows an operation.
1245
 
    """
1246
 
    pass
1247
 
 
1248
 
 
1249
 
class DBusPropertyNotFound(DBusPropertyException):
1250
 
    """An attempt was made to access a non-existing property.
1251
 
    """
1252
 
    pass
1253
 
 
1254
 
 
1255
 
class DBusObjectWithAnnotations(dbus.service.Object):
1256
 
    """A D-Bus object with annotations.
1257
 
 
1258
 
    Classes inheriting from this can use the dbus_annotations
1259
 
    decorator to add annotations to methods or signals.
1260
 
    """
1261
 
 
1262
 
    @staticmethod
1263
 
    def _is_dbus_thing(thing):
1264
 
        """Returns a function testing if an attribute is a D-Bus thing
1265
 
 
1266
 
        If called like _is_dbus_thing("method") it returns a function
1267
 
        suitable for use as predicate to inspect.getmembers().
1268
 
        """
1269
 
        return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),
1270
 
                                   False)
1271
 
 
1272
 
    def _get_all_dbus_things(self, thing):
1273
 
        """Returns a generator of (name, attribute) pairs
1274
 
        """
1275
 
        return ((getattr(athing.__get__(self), "_dbus_name", name),
1276
 
                 athing.__get__(self))
1277
 
                for cls in self.__class__.__mro__
1278
 
                for name, athing in
1279
 
                inspect.getmembers(cls, self._is_dbus_thing(thing)))
1280
 
 
1281
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1282
 
                         out_signature="s",
1283
 
                         path_keyword='object_path',
1284
 
                         connection_keyword='connection')
1285
 
    def Introspect(self, object_path, connection):
1286
 
        """Overloading of standard D-Bus method.
1287
 
 
1288
 
        Inserts annotation tags on methods and signals.
1289
 
        """
1290
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
1291
 
                                                   connection)
1292
 
        try:
1293
 
            document = xml.dom.minidom.parseString(xmlstring)
1294
 
 
1295
 
            for if_tag in document.getElementsByTagName("interface"):
1296
 
                # Add annotation tags
1297
 
                for typ in ("method", "signal"):
1298
 
                    for tag in if_tag.getElementsByTagName(typ):
1299
 
                        annots = dict()
1300
 
                        for name, prop in (self.
1301
 
                                           _get_all_dbus_things(typ)):
1302
 
                            if (name == tag.getAttribute("name")
1303
 
                                and prop._dbus_interface
1304
 
                                == if_tag.getAttribute("name")):
1305
 
                                annots.update(getattr(
1306
 
                                    prop, "_dbus_annotations", {}))
1307
 
                        for name, value in annots.items():
1308
 
                            ann_tag = document.createElement(
1309
 
                                "annotation")
1310
 
                            ann_tag.setAttribute("name", name)
1311
 
                            ann_tag.setAttribute("value", value)
1312
 
                            tag.appendChild(ann_tag)
1313
 
                # Add interface annotation tags
1314
 
                for annotation, value in dict(
1315
 
                    itertools.chain.from_iterable(
1316
 
                        annotations().items()
1317
 
                        for name, annotations
1318
 
                        in self._get_all_dbus_things("interface")
1319
 
                        if name == if_tag.getAttribute("name")
1320
 
                        )).items():
1321
 
                    ann_tag = document.createElement("annotation")
1322
 
                    ann_tag.setAttribute("name", annotation)
1323
 
                    ann_tag.setAttribute("value", value)
1324
 
                    if_tag.appendChild(ann_tag)
1325
 
                # Fix argument name for the Introspect method itself
1326
 
                if (if_tag.getAttribute("name")
1327
 
                    == dbus.INTROSPECTABLE_IFACE):
1328
 
                    for cn in if_tag.getElementsByTagName("method"):
1329
 
                        if cn.getAttribute("name") == "Introspect":
1330
 
                            for arg in cn.getElementsByTagName("arg"):
1331
 
                                if (arg.getAttribute("direction")
1332
 
                                    == "out"):
1333
 
                                    arg.setAttribute("name",
1334
 
                                                     "xml_data")
1335
 
            xmlstring = document.toxml("utf-8")
1336
 
            document.unlink()
1337
 
        except (AttributeError, xml.dom.DOMException,
1338
 
                xml.parsers.expat.ExpatError) as error:
1339
 
            logger.error("Failed to override Introspection method",
1340
 
                         exc_info=error)
1341
 
        return xmlstring
1342
 
 
1343
 
 
1344
 
class DBusObjectWithProperties(DBusObjectWithAnnotations):
1345
 
    """A D-Bus object with properties.
1346
 
 
1347
 
    Classes inheriting from this can use the dbus_service_property
1348
 
    decorator to expose methods as D-Bus properties.  It exposes the
1349
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
1350
 
    """
1351
 
 
1352
 
    def _get_dbus_property(self, interface_name, property_name):
1353
 
        """Returns a bound method if one exists which is a D-Bus
1354
 
        property with the specified name and interface.
1355
 
        """
1356
 
        for cls in self.__class__.__mro__:
1357
 
            for name, value in inspect.getmembers(
1358
 
                    cls, self._is_dbus_thing("property")):
1359
 
                if (value._dbus_name == property_name
1360
 
                    and value._dbus_interface == interface_name):
1361
 
                    return value.__get__(self)
1362
 
 
1363
 
        # No such property
1364
 
        raise DBusPropertyNotFound("{}:{}.{}".format(
1365
 
            self.dbus_object_path, interface_name, property_name))
1366
 
 
1367
 
    @classmethod
1368
 
    def _get_all_interface_names(cls):
1369
 
        """Get a sequence of all interfaces supported by an object"""
1370
 
        return (name for name in set(getattr(getattr(x, attr),
1371
 
                                             "_dbus_interface", None)
1372
 
                                     for x in (inspect.getmro(cls))
1373
 
                                     for attr in dir(x))
1374
 
                if name is not None)
1375
 
 
1376
 
    @dbus.service.method(dbus.PROPERTIES_IFACE,
1377
 
                         in_signature="ss",
1378
 
                         out_signature="v")
1379
 
    def Get(self, interface_name, property_name):
1380
 
        """Standard D-Bus property Get() method, see D-Bus standard.
1381
 
        """
1382
 
        prop = self._get_dbus_property(interface_name, property_name)
1383
 
        if prop._dbus_access == "write":
1384
 
            raise DBusPropertyAccessException(property_name)
1385
 
        value = prop()
1386
 
        if not hasattr(value, "variant_level"):
1387
 
            return value
1388
 
        return type(value)(value, variant_level=value.variant_level+1)
1389
 
 
1390
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
1391
 
    def Set(self, interface_name, property_name, value):
1392
 
        """Standard D-Bus property Set() method, see D-Bus standard.
1393
 
        """
1394
 
        prop = self._get_dbus_property(interface_name, property_name)
1395
 
        if prop._dbus_access == "read":
1396
 
            raise DBusPropertyAccessException(property_name)
1397
 
        if prop._dbus_get_args_options["byte_arrays"]:
1398
 
            # The byte_arrays option is not supported yet on
1399
 
            # signatures other than "ay".
1400
 
            if prop._dbus_signature != "ay":
1401
 
                raise ValueError("Byte arrays not supported for non-"
1402
 
                                 "'ay' signature {!r}"
1403
 
                                 .format(prop._dbus_signature))
1404
 
            value = dbus.ByteArray(b''.join(chr(byte)
1405
 
                                            for byte in value))
1406
 
        prop(value)
1407
 
 
1408
 
    @dbus.service.method(dbus.PROPERTIES_IFACE,
1409
 
                         in_signature="s",
1410
 
                         out_signature="a{sv}")
1411
 
    def GetAll(self, interface_name):
1412
 
        """Standard D-Bus property GetAll() method, see D-Bus
1413
 
        standard.
1414
 
 
1415
 
        Note: Will not include properties with access="write".
1416
 
        """
1417
 
        properties = {}
1418
 
        for name, prop in self._get_all_dbus_things("property"):
1419
 
            if (interface_name
1420
 
                and interface_name != prop._dbus_interface):
1421
 
                # Interface non-empty but did not match
1422
 
                continue
1423
 
            # Ignore write-only properties
1424
 
            if prop._dbus_access == "write":
1425
 
                continue
1426
 
            value = prop()
1427
 
            if not hasattr(value, "variant_level"):
1428
 
                properties[name] = value
1429
 
                continue
1430
 
            properties[name] = type(value)(
1431
 
                value, variant_level=value.variant_level + 1)
1432
 
        return dbus.Dictionary(properties, signature="sv")
1433
 
 
1434
 
    @dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")
1435
 
    def PropertiesChanged(self, interface_name, changed_properties,
1436
 
                          invalidated_properties):
1437
 
        """Standard D-Bus PropertiesChanged() signal, see D-Bus
1438
 
        standard.
1439
 
        """
1440
 
        pass
1441
 
 
1442
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1443
 
                         out_signature="s",
1444
 
                         path_keyword='object_path',
1445
 
                         connection_keyword='connection')
1446
 
    def Introspect(self, object_path, connection):
1447
 
        """Overloading of standard D-Bus method.
1448
 
 
1449
 
        Inserts property tags and interface annotation tags.
1450
 
        """
1451
 
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
1452
 
                                                         object_path,
1453
 
                                                         connection)
1454
 
        try:
1455
 
            document = xml.dom.minidom.parseString(xmlstring)
1456
 
 
1457
 
            def make_tag(document, name, prop):
1458
 
                e = document.createElement("property")
1459
 
                e.setAttribute("name", name)
1460
 
                e.setAttribute("type", prop._dbus_signature)
1461
 
                e.setAttribute("access", prop._dbus_access)
1462
 
                return e
1463
 
 
1464
 
            for if_tag in document.getElementsByTagName("interface"):
1465
 
                # Add property tags
1466
 
                for tag in (make_tag(document, name, prop)
1467
 
                            for name, prop
1468
 
                            in self._get_all_dbus_things("property")
1469
 
                            if prop._dbus_interface
1470
 
                            == if_tag.getAttribute("name")):
1471
 
                    if_tag.appendChild(tag)
1472
 
                # Add annotation tags for properties
1473
 
                for tag in if_tag.getElementsByTagName("property"):
1474
 
                    annots = dict()
1475
 
                    for name, prop in self._get_all_dbus_things(
1476
 
                            "property"):
1477
 
                        if (name == tag.getAttribute("name")
1478
 
                            and prop._dbus_interface
1479
 
                            == if_tag.getAttribute("name")):
1480
 
                            annots.update(getattr(
1481
 
                                prop, "_dbus_annotations", {}))
1482
 
                    for name, value in annots.items():
1483
 
                        ann_tag = document.createElement(
1484
 
                            "annotation")
1485
 
                        ann_tag.setAttribute("name", name)
1486
 
                        ann_tag.setAttribute("value", value)
1487
 
                        tag.appendChild(ann_tag)
1488
 
                # Add the names to the return values for the
1489
 
                # "org.freedesktop.DBus.Properties" methods
1490
 
                if (if_tag.getAttribute("name")
1491
 
                    == "org.freedesktop.DBus.Properties"):
1492
 
                    for cn in if_tag.getElementsByTagName("method"):
1493
 
                        if cn.getAttribute("name") == "Get":
1494
 
                            for arg in cn.getElementsByTagName("arg"):
1495
 
                                if (arg.getAttribute("direction")
1496
 
                                    == "out"):
1497
 
                                    arg.setAttribute("name", "value")
1498
 
                        elif cn.getAttribute("name") == "GetAll":
1499
 
                            for arg in cn.getElementsByTagName("arg"):
1500
 
                                if (arg.getAttribute("direction")
1501
 
                                    == "out"):
1502
 
                                    arg.setAttribute("name", "props")
1503
 
            xmlstring = document.toxml("utf-8")
1504
 
            document.unlink()
1505
 
        except (AttributeError, xml.dom.DOMException,
1506
 
                xml.parsers.expat.ExpatError) as error:
1507
 
            logger.error("Failed to override Introspection method",
1508
 
                         exc_info=error)
1509
 
        return xmlstring
1510
 
 
1511
 
 
1512
 
try:
1513
 
    dbus.OBJECT_MANAGER_IFACE
1514
 
except AttributeError:
1515
 
    dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"
1516
 
 
1517
 
 
1518
 
class DBusObjectWithObjectManager(DBusObjectWithAnnotations):
1519
 
    """A D-Bus object with an ObjectManager.
1520
 
 
1521
 
    Classes inheriting from this exposes the standard
1522
 
    GetManagedObjects call and the InterfacesAdded and
1523
 
    InterfacesRemoved signals on the standard
1524
 
    "org.freedesktop.DBus.ObjectManager" interface.
1525
 
 
1526
 
    Note: No signals are sent automatically; they must be sent
1527
 
    manually.
1528
 
    """
1529
 
    @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
1530
 
                         out_signature="a{oa{sa{sv}}}")
1531
 
    def GetManagedObjects(self):
1532
 
        """This function must be overridden"""
1533
 
        raise NotImplementedError()
1534
 
 
1535
 
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,
1536
 
                         signature="oa{sa{sv}}")
1537
 
    def InterfacesAdded(self, object_path, interfaces_and_properties):
1538
 
        pass
1539
 
 
1540
 
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature="oas")
1541
 
    def InterfacesRemoved(self, object_path, interfaces):
1542
 
        pass
1543
 
 
1544
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1545
 
                         out_signature="s",
1546
 
                         path_keyword='object_path',
1547
 
                         connection_keyword='connection')
1548
 
    def Introspect(self, object_path, connection):
1549
 
        """Overloading of standard D-Bus method.
1550
 
 
1551
 
        Override return argument name of GetManagedObjects to be
1552
 
        "objpath_interfaces_and_properties"
1553
 
        """
1554
 
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
1555
 
                                                         object_path,
1556
 
                                                         connection)
1557
 
        try:
1558
 
            document = xml.dom.minidom.parseString(xmlstring)
1559
 
 
1560
 
            for if_tag in document.getElementsByTagName("interface"):
1561
 
                # Fix argument name for the GetManagedObjects method
1562
 
                if (if_tag.getAttribute("name")
1563
 
                    == dbus.OBJECT_MANAGER_IFACE):
1564
 
                    for cn in if_tag.getElementsByTagName("method"):
1565
 
                        if (cn.getAttribute("name")
1566
 
                            == "GetManagedObjects"):
1567
 
                            for arg in cn.getElementsByTagName("arg"):
1568
 
                                if (arg.getAttribute("direction")
1569
 
                                    == "out"):
1570
 
                                    arg.setAttribute(
1571
 
                                        "name",
1572
 
                                        "objpath_interfaces"
1573
 
                                        "_and_properties")
1574
 
            xmlstring = document.toxml("utf-8")
1575
 
            document.unlink()
1576
 
        except (AttributeError, xml.dom.DOMException,
1577
 
                xml.parsers.expat.ExpatError) as error:
1578
 
            logger.error("Failed to override Introspection method",
1579
 
                         exc_info=error)
1580
 
        return xmlstring
1581
 
 
1582
 
 
1583
 
def datetime_to_dbus(dt, variant_level=0):
1584
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
1585
 
    if dt is None:
1586
 
        return dbus.String("", variant_level=variant_level)
1587
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
1588
 
 
1589
 
 
1590
 
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
1591
 
    """A class decorator; applied to a subclass of
1592
 
    dbus.service.Object, it will add alternate D-Bus attributes with
1593
 
    interface names according to the "alt_interface_names" mapping.
1594
 
    Usage:
1595
 
 
1596
 
    @alternate_dbus_interfaces({"org.example.Interface":
1597
 
                                    "net.example.AlternateInterface"})
1598
 
    class SampleDBusObject(dbus.service.Object):
1599
 
        @dbus.service.method("org.example.Interface")
1600
 
        def SampleDBusMethod():
1601
 
            pass
1602
 
 
1603
 
    The above "SampleDBusMethod" on "SampleDBusObject" will be
1604
 
    reachable via two interfaces: "org.example.Interface" and
1605
 
    "net.example.AlternateInterface", the latter of which will have
1606
 
    its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
1607
 
    "true", unless "deprecate" is passed with a False value.
1608
 
 
1609
 
    This works for methods and signals, and also for D-Bus properties
1610
 
    (from DBusObjectWithProperties) and interfaces (from the
1611
 
    dbus_interface_annotations decorator).
1612
 
    """
1613
 
 
1614
 
    def wrapper(cls):
1615
 
        for orig_interface_name, alt_interface_name in (
1616
 
                alt_interface_names.items()):
1617
 
            attr = {}
1618
 
            interface_names = set()
1619
 
            # Go though all attributes of the class
1620
 
            for attrname, attribute in inspect.getmembers(cls):
1621
 
                # Ignore non-D-Bus attributes, and D-Bus attributes
1622
 
                # with the wrong interface name
1623
 
                if (not hasattr(attribute, "_dbus_interface")
1624
 
                    or not attribute._dbus_interface.startswith(
1625
 
                        orig_interface_name)):
1626
 
                    continue
1627
 
                # Create an alternate D-Bus interface name based on
1628
 
                # the current name
1629
 
                alt_interface = attribute._dbus_interface.replace(
1630
 
                    orig_interface_name, alt_interface_name)
1631
 
                interface_names.add(alt_interface)
1632
 
                # Is this a D-Bus signal?
1633
 
                if getattr(attribute, "_dbus_is_signal", False):
1634
 
                    # Extract the original non-method undecorated
1635
 
                    # function by black magic
1636
 
                    if sys.version_info.major == 2:
1637
 
                        nonmethod_func = (dict(
1638
 
                            zip(attribute.func_code.co_freevars,
1639
 
                                attribute.__closure__))
1640
 
                                          ["func"].cell_contents)
1641
 
                    else:
1642
 
                        nonmethod_func = (dict(
1643
 
                            zip(attribute.__code__.co_freevars,
1644
 
                                attribute.__closure__))
1645
 
                                          ["func"].cell_contents)
1646
 
                    # Create a new, but exactly alike, function
1647
 
                    # object, and decorate it to be a new D-Bus signal
1648
 
                    # with the alternate D-Bus interface name
1649
 
                    new_function = copy_function(nonmethod_func)
1650
 
                    new_function = (dbus.service.signal(
1651
 
                        alt_interface,
1652
 
                        attribute._dbus_signature)(new_function))
1653
 
                    # Copy annotations, if any
1654
 
                    try:
1655
 
                        new_function._dbus_annotations = dict(
1656
 
                            attribute._dbus_annotations)
1657
 
                    except AttributeError:
1658
 
                        pass
1659
 
 
1660
 
                    # Define a creator of a function to call both the
1661
 
                    # original and alternate functions, so both the
1662
 
                    # original and alternate signals gets sent when
1663
 
                    # the function is called
1664
 
                    def fixscope(func1, func2):
1665
 
                        """This function is a scope container to pass
1666
 
                        func1 and func2 to the "call_both" function
1667
 
                        outside of its arguments"""
1668
 
 
1669
 
                        @functools.wraps(func2)
1670
 
                        def call_both(*args, **kwargs):
1671
 
                            """This function will emit two D-Bus
1672
 
                            signals by calling func1 and func2"""
1673
 
                            func1(*args, **kwargs)
1674
 
                            func2(*args, **kwargs)
1675
 
                        # Make wrapper function look like a D-Bus
1676
 
                        # signal
1677
 
                        for name, attr in inspect.getmembers(func2):
1678
 
                            if name.startswith("_dbus_"):
1679
 
                                setattr(call_both, name, attr)
1680
 
 
1681
 
                        return call_both
1682
 
                    # Create the "call_both" function and add it to
1683
 
                    # the class
1684
 
                    attr[attrname] = fixscope(attribute, new_function)
1685
 
                # Is this a D-Bus method?
1686
 
                elif getattr(attribute, "_dbus_is_method", False):
1687
 
                    # Create a new, but exactly alike, function
1688
 
                    # object.  Decorate it to be a new D-Bus method
1689
 
                    # with the alternate D-Bus interface name.  Add it
1690
 
                    # to the class.
1691
 
                    attr[attrname] = (
1692
 
                        dbus.service.method(
1693
 
                            alt_interface,
1694
 
                            attribute._dbus_in_signature,
1695
 
                            attribute._dbus_out_signature)
1696
 
                        (copy_function(attribute)))
1697
 
                    # Copy annotations, if any
1698
 
                    try:
1699
 
                        attr[attrname]._dbus_annotations = dict(
1700
 
                            attribute._dbus_annotations)
1701
 
                    except AttributeError:
1702
 
                        pass
1703
 
                # Is this a D-Bus property?
1704
 
                elif getattr(attribute, "_dbus_is_property", False):
1705
 
                    # Create a new, but exactly alike, function
1706
 
                    # object, and decorate it to be a new D-Bus
1707
 
                    # property with the alternate D-Bus interface
1708
 
                    # name.  Add it to the class.
1709
 
                    attr[attrname] = (dbus_service_property(
1710
 
                        alt_interface, attribute._dbus_signature,
1711
 
                        attribute._dbus_access,
1712
 
                        attribute._dbus_get_args_options
1713
 
                        ["byte_arrays"])
1714
 
                                      (copy_function(attribute)))
1715
 
                    # Copy annotations, if any
1716
 
                    try:
1717
 
                        attr[attrname]._dbus_annotations = dict(
1718
 
                            attribute._dbus_annotations)
1719
 
                    except AttributeError:
1720
 
                        pass
1721
 
                # Is this a D-Bus interface?
1722
 
                elif getattr(attribute, "_dbus_is_interface", False):
1723
 
                    # Create a new, but exactly alike, function
1724
 
                    # object.  Decorate it to be a new D-Bus interface
1725
 
                    # with the alternate D-Bus interface name.  Add it
1726
 
                    # to the class.
1727
 
                    attr[attrname] = (
1728
 
                        dbus_interface_annotations(alt_interface)
1729
 
                        (copy_function(attribute)))
1730
 
            if deprecate:
1731
 
                # Deprecate all alternate interfaces
1732
 
                iname = "_AlternateDBusNames_interface_annotation{}"
1733
 
                for interface_name in interface_names:
1734
 
 
1735
 
                    @dbus_interface_annotations(interface_name)
1736
 
                    def func(self):
1737
 
                        return {"org.freedesktop.DBus.Deprecated":
1738
 
                                "true"}
1739
 
                    # Find an unused name
1740
 
                    for aname in (iname.format(i)
1741
 
                                  for i in itertools.count()):
1742
 
                        if aname not in attr:
1743
 
                            attr[aname] = func
1744
 
                            break
1745
 
            if interface_names:
1746
 
                # Replace the class with a new subclass of it with
1747
 
                # methods, signals, etc. as created above.
1748
 
                if sys.version_info.major == 2:
1749
 
                    cls = type(b"{}Alternate".format(cls.__name__),
1750
 
                               (cls, ), attr)
1751
 
                else:
1752
 
                    cls = type("{}Alternate".format(cls.__name__),
1753
 
                               (cls, ), attr)
1754
 
        return cls
1755
 
 
1756
 
    return wrapper
1757
 
 
1758
 
 
1759
 
@alternate_dbus_interfaces({"se.recompile.Mandos":
1760
 
                            "se.bsnet.fukt.Mandos"})
1761
 
class ClientDBus(Client, DBusObjectWithProperties):
1762
 
    """A Client class using D-Bus
1763
 
 
1764
 
    Attributes:
1765
 
    dbus_object_path: dbus.ObjectPath
1766
 
    bus: dbus.SystemBus()
1767
 
    """
1768
 
 
1769
 
    runtime_expansions = (Client.runtime_expansions
1770
 
                          + ("dbus_object_path", ))
1771
 
 
1772
 
    _interface = "se.recompile.Mandos.Client"
1773
 
 
1774
 
    # dbus.service.Object doesn't use super(), so we can't either.
1775
 
 
1776
 
    def __init__(self, bus=None, *args, **kwargs):
1777
 
        self.bus = bus
1778
 
        Client.__init__(self, *args, **kwargs)
1779
 
        # Only now, when this client is initialized, can it show up on
1780
 
        # the D-Bus
1781
 
        client_object_name = str(self.name).translate(
1782
 
            {ord("."): ord("_"),
1783
 
             ord("-"): ord("_")})
1784
 
        self.dbus_object_path = dbus.ObjectPath(
1785
 
            "/clients/" + client_object_name)
1786
 
        DBusObjectWithProperties.__init__(self, self.bus,
1787
 
                                          self.dbus_object_path)
1788
 
 
1789
 
    def notifychangeproperty(transform_func, dbus_name,
1790
 
                             type_func=lambda x: x,
1791
 
                             variant_level=1,
1792
 
                             invalidate_only=False,
1793
 
                             _interface=_interface):
1794
 
        """ Modify a variable so that it's a property which announces
1795
 
        its changes to DBus.
1796
 
 
1797
 
        transform_fun: Function that takes a value and a variant_level
1798
 
                       and transforms it to a D-Bus type.
1799
 
        dbus_name: D-Bus name of the variable
1800
 
        type_func: Function that transform the value before sending it
1801
 
                   to the D-Bus.  Default: no transform
1802
 
        variant_level: D-Bus variant level.  Default: 1
1803
 
        """
1804
 
        attrname = "_{}".format(dbus_name)
1805
 
 
1806
 
        def setter(self, value):
1807
 
            if hasattr(self, "dbus_object_path"):
1808
 
                if (not hasattr(self, attrname) or
1809
 
                    type_func(getattr(self, attrname, None))
1810
 
                    != type_func(value)):
1811
 
                    if invalidate_only:
1812
 
                        self.PropertiesChanged(
1813
 
                            _interface, dbus.Dictionary(),
1814
 
                            dbus.Array((dbus_name, )))
1815
 
                    else:
1816
 
                        dbus_value = transform_func(
1817
 
                            type_func(value),
1818
 
                            variant_level=variant_level)
1819
 
                        self.PropertyChanged(dbus.String(dbus_name),
1820
 
                                             dbus_value)
1821
 
                        self.PropertiesChanged(
1822
 
                            _interface,
1823
 
                            dbus.Dictionary({dbus.String(dbus_name):
1824
 
                                             dbus_value}),
1825
 
                            dbus.Array())
1826
 
            setattr(self, attrname, value)
1827
 
 
1828
 
        return property(lambda self: getattr(self, attrname), setter)
1829
 
 
1830
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
1831
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
1832
 
                                             "ApprovalPending",
1833
 
                                             type_func=bool)
1834
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1835
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
1836
 
                                        "LastEnabled")
1837
 
    checker = notifychangeproperty(
1838
 
        dbus.Boolean, "CheckerRunning",
1839
 
        type_func=lambda checker: checker is not None)
1840
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
1841
 
                                           "LastCheckedOK")
1842
 
    last_checker_status = notifychangeproperty(dbus.Int16,
1843
 
                                               "LastCheckerStatus")
1844
 
    last_approval_request = notifychangeproperty(
1845
 
        datetime_to_dbus, "LastApprovalRequest")
1846
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
1847
 
                                               "ApprovedByDefault")
1848
 
    approval_delay = notifychangeproperty(
1849
 
        dbus.UInt64, "ApprovalDelay",
1850
 
        type_func=lambda td: td.total_seconds() * 1000)
1851
 
    approval_duration = notifychangeproperty(
1852
 
        dbus.UInt64, "ApprovalDuration",
1853
 
        type_func=lambda td: td.total_seconds() * 1000)
1854
 
    host = notifychangeproperty(dbus.String, "Host")
1855
 
    timeout = notifychangeproperty(
1856
 
        dbus.UInt64, "Timeout",
1857
 
        type_func=lambda td: td.total_seconds() * 1000)
1858
 
    extended_timeout = notifychangeproperty(
1859
 
        dbus.UInt64, "ExtendedTimeout",
1860
 
        type_func=lambda td: td.total_seconds() * 1000)
1861
 
    interval = notifychangeproperty(
1862
 
        dbus.UInt64, "Interval",
1863
 
        type_func=lambda td: td.total_seconds() * 1000)
1864
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
1865
 
    secret = notifychangeproperty(dbus.ByteArray, "Secret",
1866
 
                                  invalidate_only=True)
1867
 
 
1868
 
    del notifychangeproperty
1869
 
 
1870
 
    def __del__(self, *args, **kwargs):
1871
 
        try:
1872
 
            self.remove_from_connection()
1873
 
        except LookupError:
1874
 
            pass
1875
 
        if hasattr(DBusObjectWithProperties, "__del__"):
1876
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
1877
 
        Client.__del__(self, *args, **kwargs)
1878
 
 
1879
 
    def checker_callback(self, source, condition,
1880
 
                         connection, command, *args, **kwargs):
1881
 
        ret = Client.checker_callback(self, source, condition,
1882
 
                                      connection, command, *args,
1883
 
                                      **kwargs)
1884
 
        exitstatus = self.last_checker_status
1885
 
        if exitstatus >= 0:
1886
 
            # Emit D-Bus signal
1887
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
1888
 
                                  # This is specific to GNU libC
1889
 
                                  dbus.Int64(exitstatus << 8),
1890
 
                                  dbus.String(command))
1891
 
        else:
1892
 
            # Emit D-Bus signal
1893
 
            self.CheckerCompleted(dbus.Int16(-1),
1894
 
                                  dbus.Int64(
1895
 
                                      # This is specific to GNU libC
1896
 
                                      (exitstatus << 8)
1897
 
                                      | self.last_checker_signal),
1898
 
                                  dbus.String(command))
1899
 
        return ret
1900
 
 
1901
 
    def start_checker(self, *args, **kwargs):
1902
 
        old_checker_pid = getattr(self.checker, "pid", None)
1903
 
        r = Client.start_checker(self, *args, **kwargs)
1904
 
        # Only if new checker process was started
1905
 
        if (self.checker is not None
1906
 
            and old_checker_pid != self.checker.pid):
1907
 
            # Emit D-Bus signal
1908
 
            self.CheckerStarted(self.current_checker_command)
1909
 
        return r
1910
 
 
1911
 
    def _reset_approved(self):
1912
 
        self.approved = None
1913
 
        return False
1914
 
 
1915
 
    def approve(self, value=True):
1916
 
        self.approved = value
1917
 
        GLib.timeout_add(int(self.approval_duration.total_seconds()
1918
 
                             * 1000), self._reset_approved)
1919
 
        self.send_changedstate()
1920
 
 
1921
 
    #  D-Bus methods, signals & properties
1922
 
 
1923
 
    #  Interfaces
1924
 
 
1925
 
    #  Signals
1926
 
 
1927
 
    # CheckerCompleted - signal
1928
 
    @dbus.service.signal(_interface, signature="nxs")
1929
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
1930
 
        "D-Bus signal"
1931
 
        pass
1932
 
 
1933
 
    # CheckerStarted - signal
1934
 
    @dbus.service.signal(_interface, signature="s")
1935
 
    def CheckerStarted(self, command):
1936
 
        "D-Bus signal"
1937
 
        pass
1938
 
 
1939
 
    # PropertyChanged - signal
1940
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1941
 
    @dbus.service.signal(_interface, signature="sv")
1942
 
    def PropertyChanged(self, property, value):
1943
 
        "D-Bus signal"
1944
 
        pass
1945
 
 
1946
 
    # GotSecret - signal
1947
 
    @dbus.service.signal(_interface)
1948
 
    def GotSecret(self):
1949
 
        """D-Bus signal
1950
 
        Is sent after a successful transfer of secret from the Mandos
1951
 
        server to mandos-client
1952
 
        """
1953
 
        pass
1954
 
 
1955
 
    # Rejected - signal
1956
 
    @dbus.service.signal(_interface, signature="s")
1957
 
    def Rejected(self, reason):
1958
 
        "D-Bus signal"
1959
 
        pass
1960
 
 
1961
 
    # NeedApproval - signal
1962
 
    @dbus.service.signal(_interface, signature="tb")
1963
 
    def NeedApproval(self, timeout, default):
1964
 
        "D-Bus signal"
1965
 
        return self.need_approval()
1966
 
 
1967
 
    #  Methods
1968
 
 
1969
 
    # Approve - method
1970
 
    @dbus.service.method(_interface, in_signature="b")
1971
 
    def Approve(self, value):
1972
 
        self.approve(value)
1973
 
 
1974
 
    # CheckedOK - method
1975
 
    @dbus.service.method(_interface)
1976
 
    def CheckedOK(self):
1977
 
        self.checked_ok()
1978
 
 
1979
 
    # Enable - method
1980
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1981
 
    @dbus.service.method(_interface)
1982
 
    def Enable(self):
1983
 
        "D-Bus method"
1984
 
        self.enable()
1985
 
 
1986
 
    # StartChecker - method
1987
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1988
 
    @dbus.service.method(_interface)
1989
 
    def StartChecker(self):
1990
 
        "D-Bus method"
1991
 
        self.start_checker()
1992
 
 
1993
 
    # Disable - method
1994
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1995
 
    @dbus.service.method(_interface)
1996
 
    def Disable(self):
1997
 
        "D-Bus method"
1998
 
        self.disable()
1999
 
 
2000
 
    # StopChecker - method
2001
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
2002
 
    @dbus.service.method(_interface)
2003
 
    def StopChecker(self):
2004
 
        self.stop_checker()
2005
 
 
2006
 
    #  Properties
2007
 
 
2008
 
    # ApprovalPending - property
2009
 
    @dbus_service_property(_interface, signature="b", access="read")
2010
 
    def ApprovalPending_dbus_property(self):
2011
 
        return dbus.Boolean(bool(self.approvals_pending))
2012
 
 
2013
 
    # ApprovedByDefault - property
2014
 
    @dbus_service_property(_interface,
2015
 
                           signature="b",
2016
 
                           access="readwrite")
2017
 
    def ApprovedByDefault_dbus_property(self, value=None):
2018
 
        if value is None:       # get
2019
 
            return dbus.Boolean(self.approved_by_default)
2020
 
        self.approved_by_default = bool(value)
2021
 
 
2022
 
    # ApprovalDelay - property
2023
 
    @dbus_service_property(_interface,
2024
 
                           signature="t",
2025
 
                           access="readwrite")
2026
 
    def ApprovalDelay_dbus_property(self, value=None):
2027
 
        if value is None:       # get
2028
 
            return dbus.UInt64(self.approval_delay.total_seconds()
2029
 
                               * 1000)
2030
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
2031
 
 
2032
 
    # ApprovalDuration - property
2033
 
    @dbus_service_property(_interface,
2034
 
                           signature="t",
2035
 
                           access="readwrite")
2036
 
    def ApprovalDuration_dbus_property(self, value=None):
2037
 
        if value is None:       # get
2038
 
            return dbus.UInt64(self.approval_duration.total_seconds()
2039
 
                               * 1000)
2040
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
2041
 
 
2042
 
    # Name - property
2043
 
    @dbus_annotations(
2044
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2045
 
    @dbus_service_property(_interface, signature="s", access="read")
2046
 
    def Name_dbus_property(self):
2047
 
        return dbus.String(self.name)
2048
 
 
2049
 
    # KeyID - property
2050
 
    @dbus_annotations(
2051
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2052
 
    @dbus_service_property(_interface, signature="s", access="read")
2053
 
    def KeyID_dbus_property(self):
2054
 
        return dbus.String(self.key_id)
2055
 
 
2056
 
    # Fingerprint - property
2057
 
    @dbus_annotations(
2058
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2059
 
    @dbus_service_property(_interface, signature="s", access="read")
2060
 
    def Fingerprint_dbus_property(self):
2061
 
        return dbus.String(self.fingerprint)
2062
 
 
2063
 
    # Host - property
2064
 
    @dbus_service_property(_interface,
2065
 
                           signature="s",
2066
 
                           access="readwrite")
2067
 
    def Host_dbus_property(self, value=None):
2068
 
        if value is None:       # get
2069
 
            return dbus.String(self.host)
2070
 
        self.host = str(value)
2071
 
 
2072
 
    # Created - property
2073
 
    @dbus_annotations(
2074
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2075
 
    @dbus_service_property(_interface, signature="s", access="read")
2076
 
    def Created_dbus_property(self):
2077
 
        return datetime_to_dbus(self.created)
2078
 
 
2079
 
    # LastEnabled - property
2080
 
    @dbus_service_property(_interface, signature="s", access="read")
2081
 
    def LastEnabled_dbus_property(self):
2082
 
        return datetime_to_dbus(self.last_enabled)
2083
 
 
2084
 
    # Enabled - property
2085
 
    @dbus_service_property(_interface,
2086
 
                           signature="b",
2087
 
                           access="readwrite")
2088
 
    def Enabled_dbus_property(self, value=None):
2089
 
        if value is None:       # get
2090
 
            return dbus.Boolean(self.enabled)
2091
 
        if value:
2092
 
            self.enable()
2093
 
        else:
2094
 
            self.disable()
2095
 
 
2096
 
    # LastCheckedOK - property
2097
 
    @dbus_service_property(_interface,
2098
 
                           signature="s",
2099
 
                           access="readwrite")
2100
 
    def LastCheckedOK_dbus_property(self, value=None):
2101
 
        if value is not None:
2102
 
            self.checked_ok()
2103
 
            return
2104
 
        return datetime_to_dbus(self.last_checked_ok)
2105
 
 
2106
 
    # LastCheckerStatus - property
2107
 
    @dbus_service_property(_interface, signature="n", access="read")
2108
 
    def LastCheckerStatus_dbus_property(self):
2109
 
        return dbus.Int16(self.last_checker_status)
2110
 
 
2111
 
    # Expires - property
2112
 
    @dbus_service_property(_interface, signature="s", access="read")
2113
 
    def Expires_dbus_property(self):
2114
 
        return datetime_to_dbus(self.expires)
2115
 
 
2116
 
    # LastApprovalRequest - property
2117
 
    @dbus_service_property(_interface, signature="s", access="read")
2118
 
    def LastApprovalRequest_dbus_property(self):
2119
 
        return datetime_to_dbus(self.last_approval_request)
2120
 
 
2121
 
    # Timeout - property
2122
 
    @dbus_service_property(_interface,
2123
 
                           signature="t",
2124
 
                           access="readwrite")
2125
 
    def Timeout_dbus_property(self, value=None):
2126
 
        if value is None:       # get
2127
 
            return dbus.UInt64(self.timeout.total_seconds() * 1000)
2128
 
        old_timeout = self.timeout
2129
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
2130
 
        # Reschedule disabling
2131
 
        if self.enabled:
2132
 
            now = datetime.datetime.utcnow()
2133
 
            self.expires += self.timeout - old_timeout
2134
 
            if self.expires <= now:
2135
 
                # The timeout has passed
2136
 
                self.disable()
2137
 
            else:
2138
 
                if (getattr(self, "disable_initiator_tag", None)
2139
 
                    is None):
2140
 
                    return
2141
 
                GLib.source_remove(self.disable_initiator_tag)
2142
 
                self.disable_initiator_tag = GLib.timeout_add(
2143
 
                    int((self.expires - now).total_seconds() * 1000),
2144
 
                    self.disable)
2145
 
 
2146
 
    # ExtendedTimeout - property
2147
 
    @dbus_service_property(_interface,
2148
 
                           signature="t",
2149
 
                           access="readwrite")
2150
 
    def ExtendedTimeout_dbus_property(self, value=None):
2151
 
        if value is None:       # get
2152
 
            return dbus.UInt64(self.extended_timeout.total_seconds()
2153
 
                               * 1000)
2154
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
2155
 
 
2156
 
    # Interval - property
2157
 
    @dbus_service_property(_interface,
2158
 
                           signature="t",
2159
 
                           access="readwrite")
2160
 
    def Interval_dbus_property(self, value=None):
2161
 
        if value is None:       # get
2162
 
            return dbus.UInt64(self.interval.total_seconds() * 1000)
2163
 
        self.interval = datetime.timedelta(0, 0, 0, value)
2164
 
        if getattr(self, "checker_initiator_tag", None) is None:
2165
 
            return
2166
 
        if self.enabled:
2167
 
            # Reschedule checker run
2168
 
            GLib.source_remove(self.checker_initiator_tag)
2169
 
            self.checker_initiator_tag = GLib.timeout_add(
2170
 
                value, self.start_checker)
2171
 
            self.start_checker()  # Start one now, too
2172
 
 
2173
 
    # Checker - property
2174
 
    @dbus_service_property(_interface,
2175
 
                           signature="s",
2176
 
                           access="readwrite")
2177
 
    def Checker_dbus_property(self, value=None):
2178
 
        if value is None:       # get
2179
 
            return dbus.String(self.checker_command)
2180
 
        self.checker_command = str(value)
2181
 
 
2182
 
    # CheckerRunning - property
2183
 
    @dbus_service_property(_interface,
2184
 
                           signature="b",
2185
 
                           access="readwrite")
2186
 
    def CheckerRunning_dbus_property(self, value=None):
2187
 
        if value is None:       # get
2188
 
            return dbus.Boolean(self.checker is not None)
2189
 
        if value:
2190
 
            self.start_checker()
2191
 
        else:
2192
 
            self.stop_checker()
2193
 
 
2194
 
    # ObjectPath - property
2195
 
    @dbus_annotations(
2196
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",
2197
 
         "org.freedesktop.DBus.Deprecated": "true"})
2198
 
    @dbus_service_property(_interface, signature="o", access="read")
2199
 
    def ObjectPath_dbus_property(self):
2200
 
        return self.dbus_object_path  # is already a dbus.ObjectPath
2201
 
 
2202
 
    # Secret = property
2203
 
    @dbus_annotations(
2204
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal":
2205
 
         "invalidates"})
2206
 
    @dbus_service_property(_interface,
2207
 
                           signature="ay",
2208
 
                           access="write",
2209
 
                           byte_arrays=True)
2210
 
    def Secret_dbus_property(self, value):
2211
 
        self.secret = bytes(value)
2212
 
 
2213
 
    del _interface
2214
 
 
2215
 
 
2216
 
class ProxyClient(object):
2217
 
    def __init__(self, child_pipe, key_id, fpr, address):
2218
 
        self._pipe = child_pipe
2219
 
        self._pipe.send(('init', key_id, fpr, address))
2220
 
        if not self._pipe.recv():
2221
 
            raise KeyError(key_id or fpr)
2222
 
 
2223
 
    def __getattribute__(self, name):
2224
 
        if name == '_pipe':
2225
 
            return super(ProxyClient, self).__getattribute__(name)
2226
 
        self._pipe.send(('getattr', name))
2227
 
        data = self._pipe.recv()
2228
 
        if data[0] == 'data':
2229
 
            return data[1]
2230
 
        if data[0] == 'function':
2231
 
 
2232
 
            def func(*args, **kwargs):
2233
 
                self._pipe.send(('funcall', name, args, kwargs))
2234
 
                return self._pipe.recv()[1]
2235
 
 
2236
 
            return func
2237
 
 
2238
 
    def __setattr__(self, name, value):
2239
 
        if name == '_pipe':
2240
 
            return super(ProxyClient, self).__setattr__(name, value)
2241
 
        self._pipe.send(('setattr', name, value))
2242
 
 
2243
 
 
2244
 
class ClientHandler(socketserver.BaseRequestHandler, object):
2245
 
    """A class to handle client connections.
2246
 
 
2247
 
    Instantiated once for each connection to handle it.
 
371
    def still_valid(self):
 
372
        """Has the timeout not yet passed for this client?"""
 
373
        now = datetime.datetime.now()
 
374
        if self.last_checked_ok is None:
 
375
            return now < (self.created + self.timeout)
 
376
        else:
 
377
            return now < (self.last_checked_ok + self.timeout)
 
378
 
 
379
 
 
380
def peer_certificate(session):
 
381
    "Return the peer's OpenPGP certificate as a bytestring"
 
382
    # If not an OpenPGP certificate...
 
383
    if gnutls.library.functions.gnutls_certificate_type_get\
 
384
            (session._c_object) \
 
385
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
386
        # ...do the normal thing
 
387
        return session.peer_certificate
 
388
    list_size = ctypes.c_uint()
 
389
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
390
        (session._c_object, ctypes.byref(list_size))
 
391
    if list_size.value == 0:
 
392
        return None
 
393
    cert = cert_list[0]
 
394
    return ctypes.string_at(cert.data, cert.size)
 
395
 
 
396
 
 
397
def fingerprint(openpgp):
 
398
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
399
    # New empty GnuTLS certificate
 
400
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
401
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
402
        (ctypes.byref(crt))
 
403
    # New GnuTLS "datum" with the OpenPGP public key
 
404
    datum = gnutls.library.types.gnutls_datum_t\
 
405
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
406
                     ctypes.POINTER(ctypes.c_ubyte)),
 
407
         ctypes.c_uint(len(openpgp)))
 
408
    # Import the OpenPGP public key into the certificate
 
409
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
410
        (crt,
 
411
         ctypes.byref(datum),
 
412
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
413
    # New buffer for the fingerprint
 
414
    buffer = ctypes.create_string_buffer(20)
 
415
    buffer_length = ctypes.c_size_t()
 
416
    # Get the fingerprint from the certificate into the buffer
 
417
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
418
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
419
    # Deinit the certificate
 
420
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
421
    # Convert the buffer to a Python bytestring
 
422
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
423
    # Convert the bytestring to hexadecimal notation
 
424
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
425
    return hex_fpr
 
426
 
 
427
 
 
428
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
429
    """A TCP request handler class.
 
430
    Instantiated by IPv6_TCPServer for each request to handle it.
2248
431
    Note: This will run in its own forked process."""
2249
 
 
 
432
    
2250
433
    def handle(self):
2251
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
2252
 
            logger.info("TCP connection from: %s",
2253
 
                        str(self.client_address))
2254
 
            logger.debug("Pipe FD: %d",
2255
 
                         self.server.child_pipe.fileno())
2256
 
 
2257
 
            session = gnutls.ClientSession(self.request)
2258
 
 
2259
 
            # priority = ':'.join(("NONE", "+VERS-TLS1.1",
2260
 
            #                       "+AES-256-CBC", "+SHA1",
2261
 
            #                       "+COMP-NULL", "+CTYPE-OPENPGP",
2262
 
            #                       "+DHE-DSS"))
2263
 
            # Use a fallback default, since this MUST be set.
2264
 
            priority = self.server.gnutls_priority
2265
 
            if priority is None:
2266
 
                priority = "NORMAL"
2267
 
            gnutls.priority_set_direct(session._c_object,
2268
 
                                       priority.encode("utf-8"),
2269
 
                                       None)
2270
 
 
2271
 
            # Start communication using the Mandos protocol
2272
 
            # Get protocol number
2273
 
            line = self.request.makefile().readline()
2274
 
            logger.debug("Protocol version: %r", line)
2275
 
            try:
2276
 
                if int(line.strip().split()[0]) > 1:
2277
 
                    raise RuntimeError(line)
2278
 
            except (ValueError, IndexError, RuntimeError) as error:
2279
 
                logger.error("Unknown protocol version: %s", error)
2280
 
                return
2281
 
 
2282
 
            # Start GnuTLS connection
2283
 
            try:
2284
 
                session.handshake()
2285
 
            except gnutls.Error as error:
2286
 
                logger.warning("Handshake failed: %s", error)
2287
 
                # Do not run session.bye() here: the session is not
2288
 
                # established.  Just abandon the request.
2289
 
                return
2290
 
            logger.debug("Handshake succeeded")
2291
 
 
2292
 
            approval_required = False
2293
 
            try:
2294
 
                if gnutls.has_rawpk:
2295
 
                    fpr = b""
2296
 
                    try:
2297
 
                        key_id = self.key_id(
2298
 
                            self.peer_certificate(session))
2299
 
                    except (TypeError, gnutls.Error) as error:
2300
 
                        logger.warning("Bad certificate: %s", error)
2301
 
                        return
2302
 
                    logger.debug("Key ID: %s", key_id)
2303
 
 
2304
 
                else:
2305
 
                    key_id = b""
2306
 
                    try:
2307
 
                        fpr = self.fingerprint(
2308
 
                            self.peer_certificate(session))
2309
 
                    except (TypeError, gnutls.Error) as error:
2310
 
                        logger.warning("Bad certificate: %s", error)
2311
 
                        return
2312
 
                    logger.debug("Fingerprint: %s", fpr)
2313
 
 
2314
 
                try:
2315
 
                    client = ProxyClient(child_pipe, key_id, fpr,
2316
 
                                         self.client_address)
2317
 
                except KeyError:
2318
 
                    return
2319
 
 
2320
 
                if client.approval_delay:
2321
 
                    delay = client.approval_delay
2322
 
                    client.approvals_pending += 1
2323
 
                    approval_required = True
2324
 
 
2325
 
                while True:
2326
 
                    if not client.enabled:
2327
 
                        logger.info("Client %s is disabled",
2328
 
                                    client.name)
2329
 
                        if self.server.use_dbus:
2330
 
                            # Emit D-Bus signal
2331
 
                            client.Rejected("Disabled")
2332
 
                        return
2333
 
 
2334
 
                    if client.approved or not client.approval_delay:
2335
 
                        # We are approved or approval is disabled
2336
 
                        break
2337
 
                    elif client.approved is None:
2338
 
                        logger.info("Client %s needs approval",
2339
 
                                    client.name)
2340
 
                        if self.server.use_dbus:
2341
 
                            # Emit D-Bus signal
2342
 
                            client.NeedApproval(
2343
 
                                client.approval_delay.total_seconds()
2344
 
                                * 1000, client.approved_by_default)
2345
 
                    else:
2346
 
                        logger.warning("Client %s was not approved",
2347
 
                                       client.name)
2348
 
                        if self.server.use_dbus:
2349
 
                            # Emit D-Bus signal
2350
 
                            client.Rejected("Denied")
2351
 
                        return
2352
 
 
2353
 
                    # wait until timeout or approved
2354
 
                    time = datetime.datetime.now()
2355
 
                    client.changedstate.acquire()
2356
 
                    client.changedstate.wait(delay.total_seconds())
2357
 
                    client.changedstate.release()
2358
 
                    time2 = datetime.datetime.now()
2359
 
                    if (time2 - time) >= delay:
2360
 
                        if not client.approved_by_default:
2361
 
                            logger.warning("Client %s timed out while"
2362
 
                                           " waiting for approval",
2363
 
                                           client.name)
2364
 
                            if self.server.use_dbus:
2365
 
                                # Emit D-Bus signal
2366
 
                                client.Rejected("Approval timed out")
2367
 
                            return
2368
 
                        else:
2369
 
                            break
2370
 
                    else:
2371
 
                        delay -= time2 - time
2372
 
 
2373
 
                try:
2374
 
                    session.send(client.secret)
2375
 
                except gnutls.Error as error:
2376
 
                    logger.warning("gnutls send failed",
2377
 
                                   exc_info=error)
2378
 
                    return
2379
 
 
2380
 
                logger.info("Sending secret to %s", client.name)
2381
 
                # bump the timeout using extended_timeout
2382
 
                client.bump_timeout(client.extended_timeout)
2383
 
                if self.server.use_dbus:
2384
 
                    # Emit D-Bus signal
2385
 
                    client.GotSecret()
2386
 
 
2387
 
            finally:
2388
 
                if approval_required:
2389
 
                    client.approvals_pending -= 1
2390
 
                try:
2391
 
                    session.bye()
2392
 
                except gnutls.Error as error:
2393
 
                    logger.warning("GnuTLS bye failed",
2394
 
                                   exc_info=error)
2395
 
 
2396
 
    @staticmethod
2397
 
    def peer_certificate(session):
2398
 
        "Return the peer's certificate as a bytestring"
2399
 
        try:
2400
 
            cert_type = gnutls.certificate_type_get2(session._c_object,
2401
 
                                                     gnutls.CTYPE_PEERS)
2402
 
        except AttributeError:
2403
 
            cert_type = gnutls.certificate_type_get(session._c_object)
2404
 
        if gnutls.has_rawpk:
2405
 
            valid_cert_types = frozenset((gnutls.CRT_RAWPK,))
2406
 
        else:
2407
 
            valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))
2408
 
        # If not a valid certificate type...
2409
 
        if cert_type not in valid_cert_types:
2410
 
            logger.info("Cert type %r not in %r", cert_type,
2411
 
                        valid_cert_types)
2412
 
            # ...return invalid data
2413
 
            return b""
2414
 
        list_size = ctypes.c_uint(1)
2415
 
        cert_list = (gnutls.certificate_get_peers
2416
 
                     (session._c_object, ctypes.byref(list_size)))
2417
 
        if not bool(cert_list) and list_size.value != 0:
2418
 
            raise gnutls.Error("error getting peer certificate")
2419
 
        if list_size.value == 0:
2420
 
            return None
2421
 
        cert = cert_list[0]
2422
 
        return ctypes.string_at(cert.data, cert.size)
2423
 
 
2424
 
    @staticmethod
2425
 
    def key_id(certificate):
2426
 
        "Convert a certificate bytestring to a hexdigit key ID"
2427
 
        # New GnuTLS "datum" with the public key
2428
 
        datum = gnutls.datum_t(
2429
 
            ctypes.cast(ctypes.c_char_p(certificate),
2430
 
                        ctypes.POINTER(ctypes.c_ubyte)),
2431
 
            ctypes.c_uint(len(certificate)))
2432
 
        # XXX all these need to be created in the gnutls "module"
2433
 
        # New empty GnuTLS certificate
2434
 
        pubkey = gnutls.pubkey_t()
2435
 
        gnutls.pubkey_init(ctypes.byref(pubkey))
2436
 
        # Import the raw public key into the certificate
2437
 
        gnutls.pubkey_import(pubkey,
2438
 
                             ctypes.byref(datum),
2439
 
                             gnutls.X509_FMT_DER)
2440
 
        # New buffer for the key ID
2441
 
        buf = ctypes.create_string_buffer(32)
2442
 
        buf_len = ctypes.c_size_t(len(buf))
2443
 
        # Get the key ID from the raw public key into the buffer
2444
 
        gnutls.pubkey_get_key_id(pubkey,
2445
 
                                 gnutls.KEYID_USE_SHA256,
2446
 
                                 ctypes.cast(ctypes.byref(buf),
2447
 
                                             ctypes.POINTER(ctypes.c_ubyte)),
2448
 
                                 ctypes.byref(buf_len))
2449
 
        # Deinit the certificate
2450
 
        gnutls.pubkey_deinit(pubkey)
2451
 
 
2452
 
        # Convert the buffer to a Python bytestring
2453
 
        key_id = ctypes.string_at(buf, buf_len.value)
2454
 
        # Convert the bytestring to hexadecimal notation
2455
 
        hex_key_id = binascii.hexlify(key_id).upper()
2456
 
        return hex_key_id
2457
 
 
2458
 
    @staticmethod
2459
 
    def fingerprint(openpgp):
2460
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
2461
 
        # New GnuTLS "datum" with the OpenPGP public key
2462
 
        datum = gnutls.datum_t(
2463
 
            ctypes.cast(ctypes.c_char_p(openpgp),
2464
 
                        ctypes.POINTER(ctypes.c_ubyte)),
2465
 
            ctypes.c_uint(len(openpgp)))
2466
 
        # New empty GnuTLS certificate
2467
 
        crt = gnutls.openpgp_crt_t()
2468
 
        gnutls.openpgp_crt_init(ctypes.byref(crt))
2469
 
        # Import the OpenPGP public key into the certificate
2470
 
        gnutls.openpgp_crt_import(crt, ctypes.byref(datum),
2471
 
                                  gnutls.OPENPGP_FMT_RAW)
2472
 
        # Verify the self signature in the key
2473
 
        crtverify = ctypes.c_uint()
2474
 
        gnutls.openpgp_crt_verify_self(crt, 0,
2475
 
                                       ctypes.byref(crtverify))
2476
 
        if crtverify.value != 0:
2477
 
            gnutls.openpgp_crt_deinit(crt)
2478
 
            raise gnutls.CertificateSecurityError(code
2479
 
                                                  =crtverify.value)
2480
 
        # New buffer for the fingerprint
2481
 
        buf = ctypes.create_string_buffer(20)
2482
 
        buf_len = ctypes.c_size_t()
2483
 
        # Get the fingerprint from the certificate into the buffer
2484
 
        gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
2485
 
                                           ctypes.byref(buf_len))
2486
 
        # Deinit the certificate
2487
 
        gnutls.openpgp_crt_deinit(crt)
2488
 
        # Convert the buffer to a Python bytestring
2489
 
        fpr = ctypes.string_at(buf, buf_len.value)
2490
 
        # Convert the bytestring to hexadecimal notation
2491
 
        hex_fpr = binascii.hexlify(fpr).upper()
2492
 
        return hex_fpr
2493
 
 
2494
 
 
2495
 
class MultiprocessingMixIn(object):
2496
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
2497
 
 
2498
 
    def sub_process_main(self, request, address):
2499
 
        try:
2500
 
            self.finish_request(request, address)
2501
 
        except Exception:
2502
 
            self.handle_error(request, address)
2503
 
        self.close_request(request)
2504
 
 
2505
 
    def process_request(self, request, address):
2506
 
        """Start a new process to process the request."""
2507
 
        proc = multiprocessing.Process(target=self.sub_process_main,
2508
 
                                       args=(request, address))
2509
 
        proc.start()
2510
 
        return proc
2511
 
 
2512
 
 
2513
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
2514
 
    """ adds a pipe to the MixIn """
2515
 
 
2516
 
    def process_request(self, request, client_address):
2517
 
        """Overrides and wraps the original process_request().
2518
 
 
2519
 
        This function creates a new pipe in self.pipe
2520
 
        """
2521
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
2522
 
 
2523
 
        proc = MultiprocessingMixIn.process_request(self, request,
2524
 
                                                    client_address)
2525
 
        self.child_pipe.close()
2526
 
        self.add_pipe(parent_pipe, proc)
2527
 
 
2528
 
    def add_pipe(self, parent_pipe, proc):
2529
 
        """Dummy function; override as necessary"""
2530
 
        raise NotImplementedError()
2531
 
 
2532
 
 
2533
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
2534
 
                     socketserver.TCPServer, object):
2535
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
2536
 
 
 
434
        logger.debug(u"TCP connection from: %s",
 
435
                     unicode(self.client_address))
 
436
        session = gnutls.connection.ClientSession\
 
437
                  (self.request, gnutls.connection.X509Credentials())
 
438
        # Note: gnutls.connection.X509Credentials is really a generic
 
439
        # GnuTLS certificate credentials object so long as no X.509
 
440
        # keys are added to it.  Therefore, we can use it here despite
 
441
        # using OpenPGP certificates.
 
442
        
 
443
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
444
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
445
        #                "+DHE-DSS"))
 
446
        priority = "NORMAL"             # Fallback default, since this
 
447
                                        # MUST be set.
 
448
        if self.server.settings["priority"]:
 
449
            priority = self.server.settings["priority"]
 
450
        gnutls.library.functions.gnutls_priority_set_direct\
 
451
            (session._c_object, priority, None);
 
452
        
 
453
        try:
 
454
            session.handshake()
 
455
        except gnutls.errors.GNUTLSError, error:
 
456
            logger.debug(u"Handshake failed: %s", error)
 
457
            # Do not run session.bye() here: the session is not
 
458
            # established.  Just abandon the request.
 
459
            return
 
460
        try:
 
461
            fpr = fingerprint(peer_certificate(session))
 
462
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
463
            logger.debug(u"Bad certificate: %s", error)
 
464
            session.bye()
 
465
            return
 
466
        logger.debug(u"Fingerprint: %s", fpr)
 
467
        client = None
 
468
        for c in self.server.clients:
 
469
            if c.fingerprint == fpr:
 
470
                client = c
 
471
                break
 
472
        if not client:
 
473
            logger.debug(u"Client not found for fingerprint: %s", fpr)
 
474
            session.bye()
 
475
            return
 
476
        # Have to check if client.still_valid(), since it is possible
 
477
        # that the client timed out while establishing the GnuTLS
 
478
        # session.
 
479
        if not client.still_valid():
 
480
            logger.debug(u"Client %(name)s is invalid", vars(client))
 
481
            session.bye()
 
482
            return
 
483
        sent_size = 0
 
484
        while sent_size < len(client.secret):
 
485
            sent = session.send(client.secret[sent_size:])
 
486
            logger.debug(u"Sent: %d, remaining: %d",
 
487
                         sent, len(client.secret)
 
488
                         - (sent_size + sent))
 
489
            sent_size += sent
 
490
        session.bye()
 
491
 
 
492
 
 
493
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
494
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
2537
495
    Attributes:
2538
 
        enabled:        Boolean; whether this server is activated yet
2539
 
        interface:      None or a network interface name (string)
2540
 
        use_ipv6:       Boolean; to use IPv6 or not
 
496
        settings:       Server settings
 
497
        clients:        Set() of Client objects
2541
498
    """
2542
 
 
2543
 
    def __init__(self, server_address, RequestHandlerClass,
2544
 
                 interface=None,
2545
 
                 use_ipv6=True,
2546
 
                 socketfd=None):
2547
 
        """If socketfd is set, use that file descriptor instead of
2548
 
        creating a new one with socket.socket().
2549
 
        """
2550
 
        self.interface = interface
2551
 
        if use_ipv6:
2552
 
            self.address_family = socket.AF_INET6
2553
 
        if socketfd is not None:
2554
 
            # Save the file descriptor
2555
 
            self.socketfd = socketfd
2556
 
            # Save the original socket.socket() function
2557
 
            self.socket_socket = socket.socket
2558
 
 
2559
 
            # To implement --socket, we monkey patch socket.socket.
2560
 
            #
2561
 
            # (When socketserver.TCPServer is a new-style class, we
2562
 
            # could make self.socket into a property instead of monkey
2563
 
            # patching socket.socket.)
2564
 
            #
2565
 
            # Create a one-time-only replacement for socket.socket()
2566
 
            @functools.wraps(socket.socket)
2567
 
            def socket_wrapper(*args, **kwargs):
2568
 
                # Restore original function so subsequent calls are
2569
 
                # not affected.
2570
 
                socket.socket = self.socket_socket
2571
 
                del self.socket_socket
2572
 
                # This time only, return a new socket object from the
2573
 
                # saved file descriptor.
2574
 
                return socket.fromfd(self.socketfd, *args, **kwargs)
2575
 
            # Replace socket.socket() function with wrapper
2576
 
            socket.socket = socket_wrapper
2577
 
        # The socketserver.TCPServer.__init__ will call
2578
 
        # socket.socket(), which might be our replacement,
2579
 
        # socket_wrapper(), if socketfd was set.
2580
 
        socketserver.TCPServer.__init__(self, server_address,
2581
 
                                        RequestHandlerClass)
2582
 
 
 
499
    address_family = socket.AF_INET6
 
500
    def __init__(self, *args, **kwargs):
 
501
        if "settings" in kwargs:
 
502
            self.settings = kwargs["settings"]
 
503
            del kwargs["settings"]
 
504
        if "clients" in kwargs:
 
505
            self.clients = kwargs["clients"]
 
506
            del kwargs["clients"]
 
507
        return super(type(self), self).__init__(*args, **kwargs)
2583
508
    def server_bind(self):
2584
509
        """This overrides the normal server_bind() function
2585
510
        to bind to an interface if one was specified, and also NOT to
2586
511
        bind to an address or port if they were not specified."""
2587
 
        global SO_BINDTODEVICE
2588
 
        if self.interface is not None:
2589
 
            if SO_BINDTODEVICE is None:
2590
 
                # Fall back to a hard-coded value which seems to be
2591
 
                # common enough.
2592
 
                logger.warning("SO_BINDTODEVICE not found, trying 25")
2593
 
                SO_BINDTODEVICE = 25
 
512
        if self.settings["interface"]:
 
513
            # 25 is from /usr/include/asm-i486/socket.h
 
514
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
2594
515
            try:
2595
 
                self.socket.setsockopt(
2596
 
                    socket.SOL_SOCKET, SO_BINDTODEVICE,
2597
 
                    (self.interface + "\0").encode("utf-8"))
2598
 
            except socket.error as error:
2599
 
                if error.errno == errno.EPERM:
2600
 
                    logger.error("No permission to bind to"
2601
 
                                 " interface %s", self.interface)
2602
 
                elif error.errno == errno.ENOPROTOOPT:
2603
 
                    logger.error("SO_BINDTODEVICE not available;"
2604
 
                                 " cannot bind to interface %s",
2605
 
                                 self.interface)
2606
 
                elif error.errno == errno.ENODEV:
2607
 
                    logger.error("Interface %s does not exist,"
2608
 
                                 " cannot bind", self.interface)
 
516
                self.socket.setsockopt(socket.SOL_SOCKET,
 
517
                                       SO_BINDTODEVICE,
 
518
                                       self.settings["interface"])
 
519
            except socket.error, error:
 
520
                if error[0] == errno.EPERM:
 
521
                    logger.warning(u"No permission to"
 
522
                                   u" bind to interface %s",
 
523
                                   self.settings["interface"])
2609
524
                else:
2610
 
                    raise
 
525
                    raise error
2611
526
        # Only bind(2) the socket if we really need to.
2612
527
        if self.server_address[0] or self.server_address[1]:
2613
 
            if self.server_address[1]:
2614
 
                self.allow_reuse_address = True
2615
528
            if not self.server_address[0]:
2616
 
                if self.address_family == socket.AF_INET6:
2617
 
                    any_address = "::"  # in6addr_any
2618
 
                else:
2619
 
                    any_address = "0.0.0.0"  # INADDR_ANY
2620
 
                self.server_address = (any_address,
 
529
                in6addr_any = "::"
 
530
                self.server_address = (in6addr_any,
2621
531
                                       self.server_address[1])
2622
 
            elif not self.server_address[1]:
2623
 
                self.server_address = (self.server_address[0], 0)
2624
 
#                 if self.interface:
2625
 
#                     self.server_address = (self.server_address[0],
2626
 
#                                            0, # port
2627
 
#                                            0, # flowinfo
2628
 
#                                            if_nametoindex
2629
 
#                                            (self.interface))
2630
 
            return socketserver.TCPServer.server_bind(self)
2631
 
 
2632
 
 
2633
 
class MandosServer(IPv6_TCPServer):
2634
 
    """Mandos server.
2635
 
 
2636
 
    Attributes:
2637
 
        clients:        set of Client objects
2638
 
        gnutls_priority GnuTLS priority string
2639
 
        use_dbus:       Boolean; to emit D-Bus signals or not
2640
 
 
2641
 
    Assumes a GLib.MainLoop event loop.
2642
 
    """
2643
 
 
2644
 
    def __init__(self, server_address, RequestHandlerClass,
2645
 
                 interface=None,
2646
 
                 use_ipv6=True,
2647
 
                 clients=None,
2648
 
                 gnutls_priority=None,
2649
 
                 use_dbus=True,
2650
 
                 socketfd=None):
2651
 
        self.enabled = False
2652
 
        self.clients = clients
2653
 
        if self.clients is None:
2654
 
            self.clients = {}
2655
 
        self.use_dbus = use_dbus
2656
 
        self.gnutls_priority = gnutls_priority
2657
 
        IPv6_TCPServer.__init__(self, server_address,
2658
 
                                RequestHandlerClass,
2659
 
                                interface=interface,
2660
 
                                use_ipv6=use_ipv6,
2661
 
                                socketfd=socketfd)
2662
 
 
2663
 
    def server_activate(self):
2664
 
        if self.enabled:
2665
 
            return socketserver.TCPServer.server_activate(self)
2666
 
 
2667
 
    def enable(self):
2668
 
        self.enabled = True
2669
 
 
2670
 
    def add_pipe(self, parent_pipe, proc):
2671
 
        # Call "handle_ipc" for both data and EOF events
2672
 
        GLib.io_add_watch(
2673
 
            parent_pipe.fileno(),
2674
 
            GLib.IO_IN | GLib.IO_HUP,
2675
 
            functools.partial(self.handle_ipc,
2676
 
                              parent_pipe=parent_pipe,
2677
 
                              proc=proc))
2678
 
 
2679
 
    def handle_ipc(self, source, condition,
2680
 
                   parent_pipe=None,
2681
 
                   proc=None,
2682
 
                   client_object=None):
2683
 
        # error, or the other end of multiprocessing.Pipe has closed
2684
 
        if condition & (GLib.IO_ERR | GLib.IO_HUP):
2685
 
            # Wait for other process to exit
2686
 
            proc.join()
2687
 
            return False
2688
 
 
2689
 
        # Read a request from the child
2690
 
        request = parent_pipe.recv()
2691
 
        command = request[0]
2692
 
 
2693
 
        if command == 'init':
2694
 
            key_id = request[1].decode("ascii")
2695
 
            fpr = request[2].decode("ascii")
2696
 
            address = request[3]
2697
 
 
2698
 
            for c in self.clients.values():
2699
 
                if key_id == "E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855":
2700
 
                    continue
2701
 
                if key_id and c.key_id == key_id:
2702
 
                    client = c
2703
 
                    break
2704
 
                if fpr and c.fingerprint == fpr:
2705
 
                    client = c
2706
 
                    break
2707
 
            else:
2708
 
                logger.info("Client not found for key ID: %s, address"
2709
 
                            ": %s", key_id or fpr, address)
2710
 
                if self.use_dbus:
2711
 
                    # Emit D-Bus signal
2712
 
                    mandos_dbus_service.ClientNotFound(key_id or fpr,
2713
 
                                                       address[0])
2714
 
                parent_pipe.send(False)
2715
 
                return False
2716
 
 
2717
 
            GLib.io_add_watch(
2718
 
                parent_pipe.fileno(),
2719
 
                GLib.IO_IN | GLib.IO_HUP,
2720
 
                functools.partial(self.handle_ipc,
2721
 
                                  parent_pipe=parent_pipe,
2722
 
                                  proc=proc,
2723
 
                                  client_object=client))
2724
 
            parent_pipe.send(True)
2725
 
            # remove the old hook in favor of the new above hook on
2726
 
            # same fileno
2727
 
            return False
2728
 
        if command == 'funcall':
2729
 
            funcname = request[1]
2730
 
            args = request[2]
2731
 
            kwargs = request[3]
2732
 
 
2733
 
            parent_pipe.send(('data', getattr(client_object,
2734
 
                                              funcname)(*args,
2735
 
                                                        **kwargs)))
2736
 
 
2737
 
        if command == 'getattr':
2738
 
            attrname = request[1]
2739
 
            if isinstance(client_object.__getattribute__(attrname),
2740
 
                          collections.Callable):
2741
 
                parent_pipe.send(('function', ))
2742
 
            else:
2743
 
                parent_pipe.send((
2744
 
                    'data', client_object.__getattribute__(attrname)))
2745
 
 
2746
 
        if command == 'setattr':
2747
 
            attrname = request[1]
2748
 
            value = request[2]
2749
 
            setattr(client_object, attrname, value)
2750
 
 
2751
 
        return True
2752
 
 
2753
 
 
2754
 
def rfc3339_duration_to_delta(duration):
2755
 
    """Parse an RFC 3339 "duration" and return a datetime.timedelta
2756
 
 
2757
 
    >>> rfc3339_duration_to_delta("P7D")
2758
 
    datetime.timedelta(7)
2759
 
    >>> rfc3339_duration_to_delta("PT60S")
2760
 
    datetime.timedelta(0, 60)
2761
 
    >>> rfc3339_duration_to_delta("PT60M")
2762
 
    datetime.timedelta(0, 3600)
2763
 
    >>> rfc3339_duration_to_delta("PT24H")
2764
 
    datetime.timedelta(1)
2765
 
    >>> rfc3339_duration_to_delta("P1W")
2766
 
    datetime.timedelta(7)
2767
 
    >>> rfc3339_duration_to_delta("PT5M30S")
2768
 
    datetime.timedelta(0, 330)
2769
 
    >>> rfc3339_duration_to_delta("P1DT3M20S")
2770
 
    datetime.timedelta(1, 200)
2771
 
    """
2772
 
 
2773
 
    # Parsing an RFC 3339 duration with regular expressions is not
2774
 
    # possible - there would have to be multiple places for the same
2775
 
    # values, like seconds.  The current code, while more esoteric, is
2776
 
    # cleaner without depending on a parsing library.  If Python had a
2777
 
    # built-in library for parsing we would use it, but we'd like to
2778
 
    # avoid excessive use of external libraries.
2779
 
 
2780
 
    # New type for defining tokens, syntax, and semantics all-in-one
2781
 
    Token = collections.namedtuple("Token", (
2782
 
        "regexp",  # To match token; if "value" is not None, must have
2783
 
                   # a "group" containing digits
2784
 
        "value",   # datetime.timedelta or None
2785
 
        "followers"))           # Tokens valid after this token
2786
 
    # RFC 3339 "duration" tokens, syntax, and semantics; taken from
2787
 
    # the "duration" ABNF definition in RFC 3339, Appendix A.
2788
 
    token_end = Token(re.compile(r"$"), None, frozenset())
2789
 
    token_second = Token(re.compile(r"(\d+)S"),
2790
 
                         datetime.timedelta(seconds=1),
2791
 
                         frozenset((token_end, )))
2792
 
    token_minute = Token(re.compile(r"(\d+)M"),
2793
 
                         datetime.timedelta(minutes=1),
2794
 
                         frozenset((token_second, token_end)))
2795
 
    token_hour = Token(re.compile(r"(\d+)H"),
2796
 
                       datetime.timedelta(hours=1),
2797
 
                       frozenset((token_minute, token_end)))
2798
 
    token_time = Token(re.compile(r"T"),
2799
 
                       None,
2800
 
                       frozenset((token_hour, token_minute,
2801
 
                                  token_second)))
2802
 
    token_day = Token(re.compile(r"(\d+)D"),
2803
 
                      datetime.timedelta(days=1),
2804
 
                      frozenset((token_time, token_end)))
2805
 
    token_month = Token(re.compile(r"(\d+)M"),
2806
 
                        datetime.timedelta(weeks=4),
2807
 
                        frozenset((token_day, token_end)))
2808
 
    token_year = Token(re.compile(r"(\d+)Y"),
2809
 
                       datetime.timedelta(weeks=52),
2810
 
                       frozenset((token_month, token_end)))
2811
 
    token_week = Token(re.compile(r"(\d+)W"),
2812
 
                       datetime.timedelta(weeks=1),
2813
 
                       frozenset((token_end, )))
2814
 
    token_duration = Token(re.compile(r"P"), None,
2815
 
                           frozenset((token_year, token_month,
2816
 
                                      token_day, token_time,
2817
 
                                      token_week)))
2818
 
    # Define starting values:
2819
 
    # Value so far
2820
 
    value = datetime.timedelta()
2821
 
    found_token = None
2822
 
    # Following valid tokens
2823
 
    followers = frozenset((token_duration, ))
2824
 
    # String left to parse
2825
 
    s = duration
2826
 
    # Loop until end token is found
2827
 
    while found_token is not token_end:
2828
 
        # Search for any currently valid tokens
2829
 
        for token in followers:
2830
 
            match = token.regexp.match(s)
2831
 
            if match is not None:
2832
 
                # Token found
2833
 
                if token.value is not None:
2834
 
                    # Value found, parse digits
2835
 
                    factor = int(match.group(1), 10)
2836
 
                    # Add to value so far
2837
 
                    value += factor * token.value
2838
 
                # Strip token from string
2839
 
                s = token.regexp.sub("", s, 1)
2840
 
                # Go to found token
2841
 
                found_token = token
2842
 
                # Set valid next tokens
2843
 
                followers = found_token.followers
2844
 
                break
2845
 
        else:
2846
 
            # No currently valid tokens were found
2847
 
            raise ValueError("Invalid RFC 3339 duration: {!r}"
2848
 
                             .format(duration))
2849
 
    # End token found
2850
 
    return value
 
532
            elif self.server_address[1] is None:
 
533
                self.server_address = (self.server_address[0],
 
534
                                       0)
 
535
            return super(type(self), self).server_bind()
2851
536
 
2852
537
 
2853
538
def string_to_delta(interval):
2861
546
    datetime.timedelta(0, 3600)
2862
547
    >>> string_to_delta('24h')
2863
548
    datetime.timedelta(1)
2864
 
    >>> string_to_delta('1w')
 
549
    >>> string_to_delta(u'1w')
2865
550
    datetime.timedelta(7)
2866
 
    >>> string_to_delta('5m 30s')
2867
 
    datetime.timedelta(0, 330)
2868
551
    """
2869
 
 
2870
 
    try:
2871
 
        return rfc3339_duration_to_delta(interval)
2872
 
    except ValueError:
2873
 
        pass
2874
 
 
2875
 
    timevalue = datetime.timedelta(0)
2876
 
    for s in interval.split():
2877
 
        try:
2878
 
            suffix = s[-1]
2879
 
            value = int(s[:-1])
2880
 
            if suffix == "d":
2881
 
                delta = datetime.timedelta(value)
2882
 
            elif suffix == "s":
2883
 
                delta = datetime.timedelta(0, value)
2884
 
            elif suffix == "m":
2885
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
2886
 
            elif suffix == "h":
2887
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
2888
 
            elif suffix == "w":
2889
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
2890
 
            else:
2891
 
                raise ValueError("Unknown suffix {!r}".format(suffix))
2892
 
        except IndexError as e:
2893
 
            raise ValueError(*(e.args))
2894
 
        timevalue += delta
2895
 
    return timevalue
2896
 
 
2897
 
 
2898
 
def daemon(nochdir=False, noclose=False):
 
552
    try:
 
553
        suffix=unicode(interval[-1])
 
554
        value=int(interval[:-1])
 
555
        if suffix == u"d":
 
556
            delta = datetime.timedelta(value)
 
557
        elif suffix == u"s":
 
558
            delta = datetime.timedelta(0, value)
 
559
        elif suffix == u"m":
 
560
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
561
        elif suffix == u"h":
 
562
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
563
        elif suffix == u"w":
 
564
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
565
        else:
 
566
            raise ValueError
 
567
    except (ValueError, IndexError):
 
568
        raise ValueError
 
569
    return delta
 
570
 
 
571
 
 
572
def server_state_changed(state):
 
573
    """Derived from the Avahi example code"""
 
574
    if state == avahi.SERVER_COLLISION:
 
575
        logger.warning(u"Server name collision")
 
576
        service.remove()
 
577
    elif state == avahi.SERVER_RUNNING:
 
578
        service.add()
 
579
 
 
580
 
 
581
def entry_group_state_changed(state, error):
 
582
    """Derived from the Avahi example code"""
 
583
    logger.debug(u"state change: %i", state)
 
584
    
 
585
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
586
        logger.debug(u"Service established.")
 
587
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
588
        logger.warning(u"Service name collision.")
 
589
        service.rename()
 
590
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
591
        logger.critical(u"Error in group state changed %s",
 
592
                        unicode(error))
 
593
        raise AvahiGroupError("State changed: %s", str(error))
 
594
 
 
595
def if_nametoindex(interface, _func=[None]):
 
596
    """Call the C function if_nametoindex(), or equivalent"""
 
597
    if _func[0] is not None:
 
598
        return _func[0](interface)
 
599
    try:
 
600
        if "ctypes.util" not in sys.modules:
 
601
            import ctypes.util
 
602
        while True:
 
603
            try:
 
604
                libc = ctypes.cdll.LoadLibrary\
 
605
                       (ctypes.util.find_library("c"))
 
606
                _func[0] = libc.if_nametoindex
 
607
                return _func[0](interface)
 
608
            except IOError, e:
 
609
                if e != errno.EINTR:
 
610
                    raise
 
611
    except (OSError, AttributeError):
 
612
        if "struct" not in sys.modules:
 
613
            import struct
 
614
        if "fcntl" not in sys.modules:
 
615
            import fcntl
 
616
        def the_hard_way(interface):
 
617
            "Get an interface index the hard way, i.e. using fcntl()"
 
618
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
619
            s = socket.socket()
 
620
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
621
                                struct.pack("16s16x", interface))
 
622
            s.close()
 
623
            interface_index = struct.unpack("I", ifreq[16:20])[0]
 
624
            return interface_index
 
625
        _func[0] = the_hard_way
 
626
        return _func[0](interface)
 
627
 
 
628
 
 
629
def daemon(nochdir, noclose):
2899
630
    """See daemon(3).  Standard BSD Unix function.
2900
 
 
2901
631
    This should really exist as os.daemon, but it doesn't (yet)."""
2902
632
    if os.fork():
2903
633
        sys.exit()
2904
634
    os.setsid()
2905
635
    if not nochdir:
2906
636
        os.chdir("/")
2907
 
    if os.fork():
2908
 
        sys.exit()
2909
637
    if not noclose:
2910
638
        # Close all standard open file descriptors
2911
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
 
639
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
2912
640
        if not stat.S_ISCHR(os.fstat(null).st_mode):
2913
641
            raise OSError(errno.ENODEV,
2914
 
                          "{} not a character device"
2915
 
                          .format(os.devnull))
 
642
                          "/dev/null not a character device")
2916
643
        os.dup2(null, sys.stdin.fileno())
2917
644
        os.dup2(null, sys.stdout.fileno())
2918
645
        os.dup2(null, sys.stderr.fileno())
2921
648
 
2922
649
 
2923
650
def main():
2924
 
 
2925
 
    ##################################################################
2926
 
    # Parsing of options, both command line and config file
2927
 
 
2928
 
    parser = argparse.ArgumentParser()
2929
 
    parser.add_argument("-v", "--version", action="version",
2930
 
                        version="%(prog)s {}".format(version),
2931
 
                        help="show version number and exit")
2932
 
    parser.add_argument("-i", "--interface", metavar="IF",
2933
 
                        help="Bind to interface IF")
2934
 
    parser.add_argument("-a", "--address",
2935
 
                        help="Address to listen for requests on")
2936
 
    parser.add_argument("-p", "--port", type=int,
2937
 
                        help="Port number to receive requests on")
2938
 
    parser.add_argument("--check", action="store_true",
2939
 
                        help="Run self-test")
2940
 
    parser.add_argument("--debug", action="store_true",
2941
 
                        help="Debug mode; run in foreground and log"
2942
 
                        " to terminal", default=None)
2943
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
2944
 
                        help="Debug level for stdout output")
2945
 
    parser.add_argument("--priority", help="GnuTLS"
2946
 
                        " priority string (see GnuTLS documentation)")
2947
 
    parser.add_argument("--servicename",
2948
 
                        metavar="NAME", help="Zeroconf service name")
2949
 
    parser.add_argument("--configdir",
2950
 
                        default="/etc/mandos", metavar="DIR",
2951
 
                        help="Directory to search for configuration"
2952
 
                        " files")
2953
 
    parser.add_argument("--no-dbus", action="store_false",
2954
 
                        dest="use_dbus", help="Do not provide D-Bus"
2955
 
                        " system bus interface", default=None)
2956
 
    parser.add_argument("--no-ipv6", action="store_false",
2957
 
                        dest="use_ipv6", help="Do not use IPv6",
2958
 
                        default=None)
2959
 
    parser.add_argument("--no-restore", action="store_false",
2960
 
                        dest="restore", help="Do not restore stored"
2961
 
                        " state", default=None)
2962
 
    parser.add_argument("--socket", type=int,
2963
 
                        help="Specify a file descriptor to a network"
2964
 
                        " socket to use instead of creating one")
2965
 
    parser.add_argument("--statedir", metavar="DIR",
2966
 
                        help="Directory to save/restore state in")
2967
 
    parser.add_argument("--foreground", action="store_true",
2968
 
                        help="Run in foreground", default=None)
2969
 
    parser.add_argument("--no-zeroconf", action="store_false",
2970
 
                        dest="zeroconf", help="Do not use Zeroconf",
2971
 
                        default=None)
2972
 
 
2973
 
    options = parser.parse_args()
2974
 
 
 
651
    global main_loop_started
 
652
    main_loop_started = False
 
653
    
 
654
    parser = OptionParser()
 
655
    parser.add_option("-i", "--interface", type="string",
 
656
                      metavar="IF", help="Bind to interface IF")
 
657
    parser.add_option("-a", "--address", type="string",
 
658
                      help="Address to listen for requests on")
 
659
    parser.add_option("-p", "--port", type="int",
 
660
                      help="Port number to receive requests on")
 
661
    parser.add_option("--check", action="store_true", default=False,
 
662
                      help="Run self-test")
 
663
    parser.add_option("--debug", action="store_true", default=False,
 
664
                      help="Debug mode; run in foreground and log to"
 
665
                      " terminal")
 
666
    parser.add_option("--priority", type="string", help="GnuTLS"
 
667
                      " priority string (see GnuTLS documentation)")
 
668
    parser.add_option("--servicename", type="string", metavar="NAME",
 
669
                      help="Zeroconf service name")
 
670
    parser.add_option("--configdir", type="string",
 
671
                      default="/etc/mandos", metavar="DIR",
 
672
                      help="Directory to search for configuration"
 
673
                      " files")
 
674
    (options, args) = parser.parse_args()
 
675
    
2975
676
    if options.check:
2976
677
        import doctest
2977
 
        fail_count, test_count = doctest.testmod()
2978
 
        sys.exit(os.EX_OK if fail_count == 0 else 1)
2979
 
 
 
678
        doctest.testmod()
 
679
        sys.exit()
 
680
    
2980
681
    # Default values for config file for server-global settings
2981
 
    if gnutls.has_rawpk:
2982
 
        priority = ("SECURE128:!CTYPE-X.509:+CTYPE-RAWPK:!RSA"
2983
 
                    ":!VERS-ALL:+VERS-TLS1.3:%PROFILE_ULTRA")
2984
 
    else:
2985
 
        priority = ("SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"
2986
 
                    ":+SIGN-DSA-SHA256")
2987
 
    server_defaults = {"interface": "",
2988
 
                       "address": "",
2989
 
                       "port": "",
2990
 
                       "debug": "False",
2991
 
                       "priority": priority,
2992
 
                       "servicename": "Mandos",
2993
 
                       "use_dbus": "True",
2994
 
                       "use_ipv6": "True",
2995
 
                       "debuglevel": "",
2996
 
                       "restore": "True",
2997
 
                       "socket": "",
2998
 
                       "statedir": "/var/lib/mandos",
2999
 
                       "foreground": "False",
3000
 
                       "zeroconf": "True",
3001
 
                       }
3002
 
    del priority
3003
 
 
 
682
    server_defaults = { "interface": "",
 
683
                        "address": "",
 
684
                        "port": "",
 
685
                        "debug": "False",
 
686
                        "priority":
 
687
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
688
                        "servicename": "Mandos",
 
689
                        }
 
690
    
3004
691
    # Parse config file for server-global settings
3005
 
    server_config = configparser.ConfigParser(server_defaults)
 
692
    server_config = ConfigParser.SafeConfigParser(server_defaults)
3006
693
    del server_defaults
3007
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
3008
 
    # Convert the ConfigParser object to a dict
3009
 
    server_settings = server_config.defaults()
3010
 
    # Use the appropriate methods on the non-string config options
3011
 
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
3012
 
                   "foreground", "zeroconf"):
3013
 
        server_settings[option] = server_config.getboolean("DEFAULT",
3014
 
                                                           option)
3015
 
    if server_settings["port"]:
3016
 
        server_settings["port"] = server_config.getint("DEFAULT",
3017
 
                                                       "port")
3018
 
    if server_settings["socket"]:
3019
 
        server_settings["socket"] = server_config.getint("DEFAULT",
3020
 
                                                         "socket")
3021
 
        # Later, stdin will, and stdout and stderr might, be dup'ed
3022
 
        # over with an opened os.devnull.  But we don't want this to
3023
 
        # happen with a supplied network socket.
3024
 
        if 0 <= server_settings["socket"] <= 2:
3025
 
            server_settings["socket"] = os.dup(server_settings
3026
 
                                               ["socket"])
 
694
    server_config.read(os.path.join(options.configdir, "server.conf"))
 
695
    server_section = "server"
 
696
    # Convert the SafeConfigParser object to a dict
 
697
    server_settings = dict(server_config.items(server_section))
 
698
    # Use getboolean on the boolean config option
 
699
    server_settings["debug"] = server_config.getboolean\
 
700
                               (server_section, "debug")
3027
701
    del server_config
3028
 
 
 
702
    
3029
703
    # Override the settings from the config file with command line
3030
704
    # options, if set.
3031
705
    for option in ("interface", "address", "port", "debug",
3032
 
                   "priority", "servicename", "configdir", "use_dbus",
3033
 
                   "use_ipv6", "debuglevel", "restore", "statedir",
3034
 
                   "socket", "foreground", "zeroconf"):
 
706
                   "priority", "servicename", "configdir"):
3035
707
        value = getattr(options, option)
3036
708
        if value is not None:
3037
709
            server_settings[option] = value
3038
710
    del options
3039
 
    # Force all strings to be unicode
3040
 
    for option in server_settings.keys():
3041
 
        if isinstance(server_settings[option], bytes):
3042
 
            server_settings[option] = (server_settings[option]
3043
 
                                       .decode("utf-8"))
3044
 
    # Force all boolean options to be boolean
3045
 
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
3046
 
                   "foreground", "zeroconf"):
3047
 
        server_settings[option] = bool(server_settings[option])
3048
 
    # Debug implies foreground
3049
 
    if server_settings["debug"]:
3050
 
        server_settings["foreground"] = True
3051
711
    # Now we have our good server settings in "server_settings"
3052
 
 
3053
 
    ##################################################################
3054
 
 
3055
 
    if (not server_settings["zeroconf"]
3056
 
        and not (server_settings["port"]
3057
 
                 or server_settings["socket"] != "")):
3058
 
        parser.error("Needs port or socket to work without Zeroconf")
3059
 
 
3060
 
    # For convenience
3061
 
    debug = server_settings["debug"]
3062
 
    debuglevel = server_settings["debuglevel"]
3063
 
    use_dbus = server_settings["use_dbus"]
3064
 
    use_ipv6 = server_settings["use_ipv6"]
3065
 
    stored_state_path = os.path.join(server_settings["statedir"],
3066
 
                                     stored_state_file)
3067
 
    foreground = server_settings["foreground"]
3068
 
    zeroconf = server_settings["zeroconf"]
3069
 
 
3070
 
    if debug:
3071
 
        initlogger(debug, logging.DEBUG)
3072
 
    else:
3073
 
        if not debuglevel:
3074
 
            initlogger(debug)
3075
 
        else:
3076
 
            level = getattr(logging, debuglevel.upper())
3077
 
            initlogger(debug, level)
3078
 
 
3079
 
    if server_settings["servicename"] != "Mandos":
3080
 
        syslogger.setFormatter(
3081
 
            logging.Formatter('Mandos ({}) [%(process)d]:'
3082
 
                              ' %(levelname)s: %(message)s'.format(
3083
 
                                  server_settings["servicename"])))
3084
 
 
 
712
    
3085
713
    # Parse config file with clients
3086
 
    client_config = configparser.ConfigParser(Client.client_defaults)
 
714
    client_defaults = { "timeout": "1h",
 
715
                        "interval": "5m",
 
716
                        "checker": "fping -q -- %%(fqdn)s",
 
717
                        }
 
718
    client_config = ConfigParser.SafeConfigParser(client_defaults)
3087
719
    client_config.read(os.path.join(server_settings["configdir"],
3088
720
                                    "clients.conf"))
3089
 
 
3090
 
    global mandos_dbus_service
3091
 
    mandos_dbus_service = None
3092
 
 
3093
 
    socketfd = None
3094
 
    if server_settings["socket"] != "":
3095
 
        socketfd = server_settings["socket"]
3096
 
    tcp_server = MandosServer(
3097
 
        (server_settings["address"], server_settings["port"]),
3098
 
        ClientHandler,
3099
 
        interface=(server_settings["interface"] or None),
3100
 
        use_ipv6=use_ipv6,
3101
 
        gnutls_priority=server_settings["priority"],
3102
 
        use_dbus=use_dbus,
3103
 
        socketfd=socketfd)
3104
 
    if not foreground:
3105
 
        pidfilename = "/run/mandos.pid"
3106
 
        if not os.path.isdir("/run/."):
3107
 
            pidfilename = "/var/run/mandos.pid"
3108
 
        pidfile = None
3109
 
        try:
3110
 
            pidfile = codecs.open(pidfilename, "w", encoding="utf-8")
3111
 
        except IOError as e:
3112
 
            logger.error("Could not open file %r", pidfilename,
3113
 
                         exc_info=e)
3114
 
 
3115
 
    for name, group in (("_mandos", "_mandos"),
3116
 
                        ("mandos", "mandos"),
3117
 
                        ("nobody", "nogroup")):
3118
 
        try:
3119
 
            uid = pwd.getpwnam(name).pw_uid
3120
 
            gid = pwd.getpwnam(group).pw_gid
3121
 
            break
3122
 
        except KeyError:
3123
 
            continue
3124
 
    else:
3125
 
        uid = 65534
3126
 
        gid = 65534
3127
 
    try:
3128
 
        os.setgid(gid)
3129
 
        os.setuid(uid)
3130
 
        if debug:
3131
 
            logger.debug("Did setuid/setgid to {}:{}".format(uid,
3132
 
                                                             gid))
3133
 
    except OSError as error:
3134
 
        logger.warning("Failed to setuid/setgid to {}:{}: {}"
3135
 
                       .format(uid, gid, os.strerror(error.errno)))
3136
 
        if error.errno != errno.EPERM:
3137
 
            raise
3138
 
 
3139
 
    if debug:
3140
 
        # Enable all possible GnuTLS debugging
3141
 
 
3142
 
        # "Use a log level over 10 to enable all debugging options."
3143
 
        # - GnuTLS manual
3144
 
        gnutls.global_set_log_level(11)
3145
 
 
3146
 
        @gnutls.log_func
3147
 
        def debug_gnutls(level, string):
3148
 
            logger.debug("GnuTLS: %s", string[:-1])
3149
 
 
3150
 
        gnutls.global_set_log_function(debug_gnutls)
3151
 
 
3152
 
        # Redirect stdin so all checkers get /dev/null
3153
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
3154
 
        os.dup2(null, sys.stdin.fileno())
3155
 
        if null > 2:
3156
 
            os.close(null)
3157
 
 
3158
 
    # Need to fork before connecting to D-Bus
3159
 
    if not foreground:
3160
 
        # Close all input and output, do double fork, etc.
3161
 
        daemon()
3162
 
 
3163
 
    if gi.version_info < (3, 10, 2):
3164
 
        # multiprocessing will use threads, so before we use GLib we
3165
 
        # need to inform GLib that threads will be used.
3166
 
        GLib.threads_init()
3167
 
 
 
721
    
 
722
    global service
 
723
    service = AvahiService(name = server_settings["servicename"],
 
724
                           type = "_mandos._tcp", );
 
725
    if server_settings["interface"]:
 
726
        service.interface = if_nametoindex(server_settings["interface"])
 
727
    
3168
728
    global main_loop
 
729
    global bus
 
730
    global server
3169
731
    # From the Avahi example code
3170
 
    DBusGMainLoop(set_as_default=True)
3171
 
    main_loop = GLib.MainLoop()
 
732
    DBusGMainLoop(set_as_default=True )
 
733
    main_loop = gobject.MainLoop()
3172
734
    bus = dbus.SystemBus()
 
735
    server = dbus.Interface(
 
736
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
737
            avahi.DBUS_INTERFACE_SERVER )
3173
738
    # End of Avahi example code
3174
 
    if use_dbus:
3175
 
        try:
3176
 
            bus_name = dbus.service.BusName("se.recompile.Mandos",
3177
 
                                            bus,
3178
 
                                            do_not_queue=True)
3179
 
            old_bus_name = dbus.service.BusName(
3180
 
                "se.bsnet.fukt.Mandos", bus,
3181
 
                do_not_queue=True)
3182
 
        except dbus.exceptions.DBusException as e:
3183
 
            logger.error("Disabling D-Bus:", exc_info=e)
3184
 
            use_dbus = False
3185
 
            server_settings["use_dbus"] = False
3186
 
            tcp_server.use_dbus = False
3187
 
    if zeroconf:
3188
 
        protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
3189
 
        service = AvahiServiceToSyslog(
3190
 
            name=server_settings["servicename"],
3191
 
            servicetype="_mandos._tcp",
3192
 
            protocol=protocol,
3193
 
            bus=bus)
3194
 
        if server_settings["interface"]:
3195
 
            service.interface = if_nametoindex(
3196
 
                server_settings["interface"].encode("utf-8"))
3197
 
 
3198
 
    global multiprocessing_manager
3199
 
    multiprocessing_manager = multiprocessing.Manager()
3200
 
 
3201
 
    client_class = Client
3202
 
    if use_dbus:
3203
 
        client_class = functools.partial(ClientDBus, bus=bus)
3204
 
 
3205
 
    client_settings = Client.config_parser(client_config)
3206
 
    old_client_settings = {}
3207
 
    clients_data = {}
3208
 
 
3209
 
    # This is used to redirect stdout and stderr for checker processes
3210
 
    global wnull
3211
 
    wnull = open(os.devnull, "w")  # A writable /dev/null
3212
 
    # Only used if server is running in foreground but not in debug
3213
 
    # mode
3214
 
    if debug or not foreground:
3215
 
        wnull.close()
3216
 
 
3217
 
    # Get client data and settings from last running state.
3218
 
    if server_settings["restore"]:
3219
 
        try:
3220
 
            with open(stored_state_path, "rb") as stored_state:
3221
 
                if sys.version_info.major == 2:
3222
 
                    clients_data, old_client_settings = pickle.load(
3223
 
                        stored_state)
3224
 
                else:
3225
 
                    bytes_clients_data, bytes_old_client_settings = (
3226
 
                        pickle.load(stored_state, encoding="bytes"))
3227
 
                    #   Fix bytes to strings
3228
 
                    #  clients_data
3229
 
                    # .keys()
3230
 
                    clients_data = {(key.decode("utf-8")
3231
 
                                     if isinstance(key, bytes)
3232
 
                                     else key): value
3233
 
                                    for key, value in
3234
 
                                    bytes_clients_data.items()}
3235
 
                    del bytes_clients_data
3236
 
                    for key in clients_data:
3237
 
                        value = {(k.decode("utf-8")
3238
 
                                  if isinstance(k, bytes) else k): v
3239
 
                                 for k, v in
3240
 
                                 clients_data[key].items()}
3241
 
                        clients_data[key] = value
3242
 
                        # .client_structure
3243
 
                        value["client_structure"] = [
3244
 
                            (s.decode("utf-8")
3245
 
                             if isinstance(s, bytes)
3246
 
                             else s) for s in
3247
 
                            value["client_structure"]]
3248
 
                        # .name & .host
3249
 
                        for k in ("name", "host"):
3250
 
                            if isinstance(value[k], bytes):
3251
 
                                value[k] = value[k].decode("utf-8")
3252
 
                        if "key_id" not in value:
3253
 
                            value["key_id"] = ""
3254
 
                        elif "fingerprint" not in value:
3255
 
                            value["fingerprint"] = ""
3256
 
                    #  old_client_settings
3257
 
                    # .keys()
3258
 
                    old_client_settings = {
3259
 
                        (key.decode("utf-8")
3260
 
                         if isinstance(key, bytes)
3261
 
                         else key): value
3262
 
                        for key, value in
3263
 
                        bytes_old_client_settings.items()}
3264
 
                    del bytes_old_client_settings
3265
 
                    # .host
3266
 
                    for value in old_client_settings.values():
3267
 
                        if isinstance(value["host"], bytes):
3268
 
                            value["host"] = (value["host"]
3269
 
                                             .decode("utf-8"))
3270
 
            os.remove(stored_state_path)
3271
 
        except IOError as e:
3272
 
            if e.errno == errno.ENOENT:
3273
 
                logger.warning("Could not load persistent state:"
3274
 
                               " {}".format(os.strerror(e.errno)))
3275
 
            else:
3276
 
                logger.critical("Could not load persistent state:",
3277
 
                                exc_info=e)
3278
 
                raise
3279
 
        except EOFError as e:
3280
 
            logger.warning("Could not load persistent state: "
3281
 
                           "EOFError:",
3282
 
                           exc_info=e)
3283
 
 
3284
 
    with PGPEngine() as pgp:
3285
 
        for client_name, client in clients_data.items():
3286
 
            # Skip removed clients
3287
 
            if client_name not in client_settings:
3288
 
                continue
3289
 
 
3290
 
            # Decide which value to use after restoring saved state.
3291
 
            # We have three different values: Old config file,
3292
 
            # new config file, and saved state.
3293
 
            # New config value takes precedence if it differs from old
3294
 
            # config value, otherwise use saved state.
3295
 
            for name, value in client_settings[client_name].items():
3296
 
                try:
3297
 
                    # For each value in new config, check if it
3298
 
                    # differs from the old config value (Except for
3299
 
                    # the "secret" attribute)
3300
 
                    if (name != "secret"
3301
 
                        and (value !=
3302
 
                             old_client_settings[client_name][name])):
3303
 
                        client[name] = value
3304
 
                except KeyError:
3305
 
                    pass
3306
 
 
3307
 
            # Clients who has passed its expire date can still be
3308
 
            # enabled if its last checker was successful.  A Client
3309
 
            # whose checker succeeded before we stored its state is
3310
 
            # assumed to have successfully run all checkers during
3311
 
            # downtime.
3312
 
            if client["enabled"]:
3313
 
                if datetime.datetime.utcnow() >= client["expires"]:
3314
 
                    if not client["last_checked_ok"]:
3315
 
                        logger.warning(
3316
 
                            "disabling client {} - Client never "
3317
 
                            "performed a successful checker".format(
3318
 
                                client_name))
3319
 
                        client["enabled"] = False
3320
 
                    elif client["last_checker_status"] != 0:
3321
 
                        logger.warning(
3322
 
                            "disabling client {} - Client last"
3323
 
                            " checker failed with error code"
3324
 
                            " {}".format(
3325
 
                                client_name,
3326
 
                                client["last_checker_status"]))
3327
 
                        client["enabled"] = False
3328
 
                    else:
3329
 
                        client["expires"] = (
3330
 
                            datetime.datetime.utcnow()
3331
 
                            + client["timeout"])
3332
 
                        logger.debug("Last checker succeeded,"
3333
 
                                     " keeping {} enabled".format(
3334
 
                                         client_name))
3335
 
            try:
3336
 
                client["secret"] = pgp.decrypt(
3337
 
                    client["encrypted_secret"],
3338
 
                    client_settings[client_name]["secret"])
3339
 
            except PGPError:
3340
 
                # If decryption fails, we use secret from new settings
3341
 
                logger.debug("Failed to decrypt {} old secret".format(
3342
 
                    client_name))
3343
 
                client["secret"] = (client_settings[client_name]
3344
 
                                    ["secret"])
3345
 
 
3346
 
    # Add/remove clients based on new changes made to config
3347
 
    for client_name in (set(old_client_settings)
3348
 
                        - set(client_settings)):
3349
 
        del clients_data[client_name]
3350
 
    for client_name in (set(client_settings)
3351
 
                        - set(old_client_settings)):
3352
 
        clients_data[client_name] = client_settings[client_name]
3353
 
 
3354
 
    # Create all client objects
3355
 
    for client_name, client in clients_data.items():
3356
 
        tcp_server.clients[client_name] = client_class(
3357
 
            name=client_name,
3358
 
            settings=client,
3359
 
            server_settings=server_settings)
3360
 
 
3361
 
    if not tcp_server.clients:
3362
 
        logger.warning("No clients defined")
3363
 
 
3364
 
    if not foreground:
3365
 
        if pidfile is not None:
3366
 
            pid = os.getpid()
3367
 
            try:
3368
 
                with pidfile:
3369
 
                    print(pid, file=pidfile)
3370
 
            except IOError:
3371
 
                logger.error("Could not write to file %r with PID %d",
3372
 
                             pidfilename, pid)
3373
 
        del pidfile
3374
 
        del pidfilename
3375
 
 
3376
 
    for termsig in (signal.SIGHUP, signal.SIGTERM):
3377
 
        GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,
3378
 
                             lambda: main_loop.quit() and False)
3379
 
 
3380
 
    if use_dbus:
3381
 
 
3382
 
        @alternate_dbus_interfaces(
3383
 
            {"se.recompile.Mandos": "se.bsnet.fukt.Mandos"})
3384
 
        class MandosDBusService(DBusObjectWithObjectManager):
3385
 
            """A D-Bus proxy object"""
3386
 
 
3387
 
            def __init__(self):
3388
 
                dbus.service.Object.__init__(self, bus, "/")
3389
 
 
3390
 
            _interface = "se.recompile.Mandos"
3391
 
 
3392
 
            @dbus.service.signal(_interface, signature="o")
3393
 
            def ClientAdded(self, objpath):
3394
 
                "D-Bus signal"
3395
 
                pass
3396
 
 
3397
 
            @dbus.service.signal(_interface, signature="ss")
3398
 
            def ClientNotFound(self, key_id, address):
3399
 
                "D-Bus signal"
3400
 
                pass
3401
 
 
3402
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3403
 
                               "true"})
3404
 
            @dbus.service.signal(_interface, signature="os")
3405
 
            def ClientRemoved(self, objpath, name):
3406
 
                "D-Bus signal"
3407
 
                pass
3408
 
 
3409
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3410
 
                               "true"})
3411
 
            @dbus.service.method(_interface, out_signature="ao")
3412
 
            def GetAllClients(self):
3413
 
                "D-Bus method"
3414
 
                return dbus.Array(c.dbus_object_path for c in
3415
 
                                  tcp_server.clients.values())
3416
 
 
3417
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3418
 
                               "true"})
3419
 
            @dbus.service.method(_interface,
3420
 
                                 out_signature="a{oa{sv}}")
3421
 
            def GetAllClientsWithProperties(self):
3422
 
                "D-Bus method"
3423
 
                return dbus.Dictionary(
3424
 
                    {c.dbus_object_path: c.GetAll(
3425
 
                        "se.recompile.Mandos.Client")
3426
 
                     for c in tcp_server.clients.values()},
3427
 
                    signature="oa{sv}")
3428
 
 
3429
 
            @dbus.service.method(_interface, in_signature="o")
3430
 
            def RemoveClient(self, object_path):
3431
 
                "D-Bus method"
3432
 
                for c in tcp_server.clients.values():
3433
 
                    if c.dbus_object_path == object_path:
3434
 
                        del tcp_server.clients[c.name]
3435
 
                        c.remove_from_connection()
3436
 
                        # Don't signal the disabling
3437
 
                        c.disable(quiet=True)
3438
 
                        # Emit D-Bus signal for removal
3439
 
                        self.client_removed_signal(c)
3440
 
                        return
3441
 
                raise KeyError(object_path)
3442
 
 
3443
 
            del _interface
3444
 
 
3445
 
            @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
3446
 
                                 out_signature="a{oa{sa{sv}}}")
3447
 
            def GetManagedObjects(self):
3448
 
                """D-Bus method"""
3449
 
                return dbus.Dictionary(
3450
 
                    {client.dbus_object_path:
3451
 
                     dbus.Dictionary(
3452
 
                         {interface: client.GetAll(interface)
3453
 
                          for interface in
3454
 
                          client._get_all_interface_names()})
3455
 
                     for client in tcp_server.clients.values()})
3456
 
 
3457
 
            def client_added_signal(self, client):
3458
 
                """Send the new standard signal and the old signal"""
3459
 
                if use_dbus:
3460
 
                    # New standard signal
3461
 
                    self.InterfacesAdded(
3462
 
                        client.dbus_object_path,
3463
 
                        dbus.Dictionary(
3464
 
                            {interface: client.GetAll(interface)
3465
 
                             for interface in
3466
 
                             client._get_all_interface_names()}))
3467
 
                    # Old signal
3468
 
                    self.ClientAdded(client.dbus_object_path)
3469
 
 
3470
 
            def client_removed_signal(self, client):
3471
 
                """Send the new standard signal and the old signal"""
3472
 
                if use_dbus:
3473
 
                    # New standard signal
3474
 
                    self.InterfacesRemoved(
3475
 
                        client.dbus_object_path,
3476
 
                        client._get_all_interface_names())
3477
 
                    # Old signal
3478
 
                    self.ClientRemoved(client.dbus_object_path,
3479
 
                                       client.name)
3480
 
 
3481
 
        mandos_dbus_service = MandosDBusService()
3482
 
 
3483
 
    # Save modules to variables to exempt the modules from being
3484
 
    # unloaded before the function registered with atexit() is run.
3485
 
    mp = multiprocessing
3486
 
    wn = wnull
3487
 
 
 
739
    
 
740
    debug = server_settings["debug"]
 
741
    
 
742
    if debug:
 
743
        console = logging.StreamHandler()
 
744
        # console.setLevel(logging.DEBUG)
 
745
        console.setFormatter(logging.Formatter\
 
746
                             ('%(levelname)s: %(message)s'))
 
747
        logger.addHandler(console)
 
748
        del console
 
749
    
 
750
    clients = Set()
 
751
    def remove_from_clients(client):
 
752
        clients.remove(client)
 
753
        if not clients:
 
754
            logger.debug(u"No clients left, exiting")
 
755
            sys.exit()
 
756
    
 
757
    clients.update(Set(Client(name=section,
 
758
                              stop_hook = remove_from_clients,
 
759
                              **(dict(client_config\
 
760
                                      .items(section))))
 
761
                       for section in client_config.sections()))
 
762
    
 
763
    if not debug:
 
764
        daemon(False, False)
 
765
    
3488
766
    def cleanup():
3489
767
        "Cleanup function; run on exit"
3490
 
        if zeroconf:
3491
 
            service.cleanup()
3492
 
 
3493
 
        mp.active_children()
3494
 
        wn.close()
3495
 
        if not (tcp_server.clients or client_settings):
3496
 
            return
3497
 
 
3498
 
        # Store client before exiting. Secrets are encrypted with key
3499
 
        # based on what config file has. If config file is
3500
 
        # removed/edited, old secret will thus be unrecovable.
3501
 
        clients = {}
3502
 
        with PGPEngine() as pgp:
3503
 
            for client in tcp_server.clients.values():
3504
 
                key = client_settings[client.name]["secret"]
3505
 
                client.encrypted_secret = pgp.encrypt(client.secret,
3506
 
                                                      key)
3507
 
                client_dict = {}
3508
 
 
3509
 
                # A list of attributes that can not be pickled
3510
 
                # + secret.
3511
 
                exclude = {"bus", "changedstate", "secret",
3512
 
                           "checker", "server_settings"}
3513
 
                for name, typ in inspect.getmembers(dbus.service
3514
 
                                                    .Object):
3515
 
                    exclude.add(name)
3516
 
 
3517
 
                client_dict["encrypted_secret"] = (client
3518
 
                                                   .encrypted_secret)
3519
 
                for attr in client.client_structure:
3520
 
                    if attr not in exclude:
3521
 
                        client_dict[attr] = getattr(client, attr)
3522
 
 
3523
 
                clients[client.name] = client_dict
3524
 
                del client_settings[client.name]["secret"]
3525
 
 
3526
 
        try:
3527
 
            with tempfile.NamedTemporaryFile(
3528
 
                    mode='wb',
3529
 
                    suffix=".pickle",
3530
 
                    prefix='clients-',
3531
 
                    dir=os.path.dirname(stored_state_path),
3532
 
                    delete=False) as stored_state:
3533
 
                pickle.dump((clients, client_settings), stored_state,
3534
 
                            protocol=2)
3535
 
                tempname = stored_state.name
3536
 
            os.rename(tempname, stored_state_path)
3537
 
        except (IOError, OSError) as e:
3538
 
            if not debug:
3539
 
                try:
3540
 
                    os.remove(tempname)
3541
 
                except NameError:
3542
 
                    pass
3543
 
            if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
3544
 
                logger.warning("Could not save persistent state: {}"
3545
 
                               .format(os.strerror(e.errno)))
3546
 
            else:
3547
 
                logger.warning("Could not save persistent state:",
3548
 
                               exc_info=e)
3549
 
                raise
3550
 
 
3551
 
        # Delete all clients, and settings from config
3552
 
        while tcp_server.clients:
3553
 
            name, client = tcp_server.clients.popitem()
3554
 
            if use_dbus:
3555
 
                client.remove_from_connection()
3556
 
            # Don't signal the disabling
3557
 
            client.disable(quiet=True)
3558
 
            # Emit D-Bus signal for removal
3559
 
            if use_dbus:
3560
 
                mandos_dbus_service.client_removed_signal(client)
3561
 
        client_settings.clear()
3562
 
 
 
768
        global group
 
769
        # From the Avahi example code
 
770
        if not group is None:
 
771
            group.Free()
 
772
            group = None
 
773
        # End of Avahi example code
 
774
        
 
775
        while clients:
 
776
            client = clients.pop()
 
777
            client.stop_hook = None
 
778
            client.stop()
 
779
    
3563
780
    atexit.register(cleanup)
3564
 
 
3565
 
    for client in tcp_server.clients.values():
3566
 
        if use_dbus:
3567
 
            # Emit D-Bus signal for adding
3568
 
            mandos_dbus_service.client_added_signal(client)
3569
 
        # Need to initiate checking of clients
3570
 
        if client.enabled:
3571
 
            client.init_checker()
3572
 
 
3573
 
    tcp_server.enable()
3574
 
    tcp_server.server_activate()
3575
 
 
 
781
    
 
782
    if not debug:
 
783
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
784
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
785
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
786
    
 
787
    for client in clients:
 
788
        client.start()
 
789
    
 
790
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
791
                                 server_settings["port"]),
 
792
                                tcp_handler,
 
793
                                settings=server_settings,
 
794
                                clients=clients)
3576
795
    # Find out what port we got
3577
 
    if zeroconf:
3578
 
        service.port = tcp_server.socket.getsockname()[1]
3579
 
    if use_ipv6:
3580
 
        logger.info("Now listening on address %r, port %d,"
3581
 
                    " flowinfo %d, scope_id %d",
3582
 
                    *tcp_server.socket.getsockname())
3583
 
    else:                       # IPv4
3584
 
        logger.info("Now listening on address %r, port %d",
3585
 
                    *tcp_server.socket.getsockname())
3586
 
 
3587
 
    # service.interface = tcp_server.socket.getsockname()[3]
3588
 
 
 
796
    service.port = tcp_server.socket.getsockname()[1]
 
797
    logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
 
798
                 u" scope_id %d" % tcp_server.socket.getsockname())
 
799
    
 
800
    #service.interface = tcp_server.socket.getsockname()[3]
 
801
    
3589
802
    try:
3590
 
        if zeroconf:
3591
 
            # From the Avahi example code
3592
 
            try:
3593
 
                service.activate()
3594
 
            except dbus.exceptions.DBusException as error:
3595
 
                logger.critical("D-Bus Exception", exc_info=error)
3596
 
                cleanup()
3597
 
                sys.exit(1)
3598
 
            # End of Avahi example code
3599
 
 
3600
 
        GLib.io_add_watch(tcp_server.fileno(), GLib.IO_IN,
3601
 
                          lambda *args, **kwargs:
3602
 
                          (tcp_server.handle_request
3603
 
                           (*args[2:], **kwargs) or True))
3604
 
 
 
803
        # From the Avahi example code
 
804
        server.connect_to_signal("StateChanged", server_state_changed)
 
805
        try:
 
806
            server_state_changed(server.GetState())
 
807
        except dbus.exceptions.DBusException, error:
 
808
            logger.critical(u"DBusException: %s", error)
 
809
            sys.exit(1)
 
810
        # End of Avahi example code
 
811
        
 
812
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
813
                             lambda *args, **kwargs:
 
814
                             tcp_server.handle_request\
 
815
                             (*args[2:], **kwargs) or True)
 
816
        
3605
817
        logger.debug("Starting main loop")
 
818
        main_loop_started = True
3606
819
        main_loop.run()
3607
 
    except AvahiError as error:
3608
 
        logger.critical("Avahi Error", exc_info=error)
3609
 
        cleanup()
 
820
    except AvahiError, error:
 
821
        logger.critical(u"AvahiError: %s" + unicode(error))
3610
822
        sys.exit(1)
3611
823
    except KeyboardInterrupt:
3612
824
        if debug:
3613
 
            print("", file=sys.stderr)
3614
 
        logger.debug("Server received KeyboardInterrupt")
3615
 
    logger.debug("Server exiting")
3616
 
    # Must run before the D-Bus bus name gets deregistered
3617
 
    cleanup()
3618
 
 
 
825
            print
3619
826
 
3620
827
if __name__ == '__main__':
3621
828
    main()