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  • Committer: Björn Påhlsson
  • Date: 2008-08-04 15:50:19 UTC
  • mto: (237.7.1 mandos) (24.1.154 mandos)
  • mto: This revision was merged to the branch mainline in revision 42.
  • Revision ID: belorn@braxen-20080804155019-uze55fh654j1f0ow
mandosclient
        changed to argp

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server.py
1
 
#!/usr/bin/python3 -bI
2
 
# -*- mode: python; after-save-hook: (lambda () (let ((command (if (fboundp 'file-local-name) (file-local-name (buffer-file-name)) (or (file-remote-p (buffer-file-name) 'localname) (buffer-file-name))))) (if (= (progn (if (get-buffer "*Test*") (kill-buffer "*Test*")) (process-file-shell-command (format "%s --check" (shell-quote-argument command)) nil "*Test*")) 0) (let ((w (get-buffer-window "*Test*"))) (if w (delete-window w))) (progn (with-current-buffer "*Test*" (compilation-mode)) (display-buffer "*Test*" '(display-buffer-in-side-window)))))); coding: utf-8 -*-
3
 
#
 
1
#!/usr/bin/python
 
2
# -*- mode: python; coding: utf-8 -*-
 
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 © 2008-2020 Teddy Hogeborn
15
 
# Copyright © 2008-2020 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
 
import unittest
81
 
import random
82
 
import shlex
83
57
 
84
58
import dbus
85
 
import dbus.service
86
 
import gi
87
 
from gi.repository import GLib
 
59
import gobject
 
60
import avahi
88
61
from dbus.mainloop.glib import DBusGMainLoop
89
62
import ctypes
90
 
import ctypes.util
91
 
import xml.dom.minidom
92
 
import inspect
93
 
 
94
 
if sys.version_info.major == 2:
95
 
    __metaclass__ = type
96
 
    str = unicode
97
 
 
98
 
# Add collections.abc.Callable if it does not exist
99
 
try:
100
 
    collections.abc.Callable
101
 
except AttributeError:
102
 
    class abc:
103
 
        Callable = collections.Callable
104
 
    collections.abc = abc
105
 
    del abc
106
 
 
107
 
# Add shlex.quote if it does not exist
108
 
try:
109
 
    shlex.quote
110
 
except AttributeError:
111
 
    shlex.quote = re.escape
112
 
 
113
 
# Show warnings by default
114
 
if not sys.warnoptions:
115
 
    import warnings
116
 
    warnings.simplefilter("default")
117
 
 
118
 
# Try to find the value of SO_BINDTODEVICE:
119
 
try:
120
 
    # This is where SO_BINDTODEVICE is in Python 3.3 (or 3.4?) and
121
 
    # newer, and it is also the most natural place for it:
122
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
123
 
except AttributeError:
124
 
    try:
125
 
        # This is where SO_BINDTODEVICE was up to and including Python
126
 
        # 2.6, and also 3.2:
127
 
        from IN import SO_BINDTODEVICE
128
 
    except ImportError:
129
 
        # In Python 2.7 it seems to have been removed entirely.
130
 
        # Try running the C preprocessor:
131
 
        try:
132
 
            cc = subprocess.Popen(["cc", "--language=c", "-E",
133
 
                                   "/dev/stdin"],
134
 
                                  stdin=subprocess.PIPE,
135
 
                                  stdout=subprocess.PIPE)
136
 
            stdout = cc.communicate(
137
 
                "#include <sys/socket.h>\nSO_BINDTODEVICE\n")[0]
138
 
            SO_BINDTODEVICE = int(stdout.splitlines()[-1])
139
 
        except (OSError, ValueError, IndexError):
140
 
            # No value found
141
 
            SO_BINDTODEVICE = None
142
 
 
143
 
if sys.version_info < (3, 2):
144
 
    configparser.Configparser = configparser.SafeConfigParser
145
 
 
146
 
version = "1.8.12"
147
 
stored_state_file = "clients.pickle"
148
 
 
149
 
logger = logging.getLogger()
150
 
logging.captureWarnings(True)   # Show warnings via the logging system
151
 
syslogger = None
152
 
 
153
 
try:
154
 
    if_nametoindex = ctypes.cdll.LoadLibrary(
155
 
        ctypes.util.find_library("c")).if_nametoindex
156
 
except (OSError, AttributeError):
157
 
 
158
 
    def if_nametoindex(interface):
159
 
        "Get an interface index the hard way, i.e. using fcntl()"
160
 
        SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
161
 
        with contextlib.closing(socket.socket()) as s:
162
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
163
 
                                struct.pack(b"16s16x", interface))
164
 
        interface_index = struct.unpack("I", ifreq[16:20])[0]
165
 
        return interface_index
166
 
 
167
 
 
168
 
def copy_function(func):
169
 
    """Make a copy of a function"""
170
 
    if sys.version_info.major == 2:
171
 
        return types.FunctionType(func.func_code,
172
 
                                  func.func_globals,
173
 
                                  func.func_name,
174
 
                                  func.func_defaults,
175
 
                                  func.func_closure)
176
 
    else:
177
 
        return types.FunctionType(func.__code__,
178
 
                                  func.__globals__,
179
 
                                  func.__name__,
180
 
                                  func.__defaults__,
181
 
                                  func.__closure__)
182
 
 
183
 
 
184
 
def initlogger(debug, level=logging.WARNING):
185
 
    """init logger and add loglevel"""
186
 
 
187
 
    global syslogger
188
 
    syslogger = (logging.handlers.SysLogHandler(
189
 
        facility=logging.handlers.SysLogHandler.LOG_DAEMON,
190
 
        address="/dev/log"))
191
 
    syslogger.setFormatter(logging.Formatter
192
 
                           ('Mandos [%(process)d]: %(levelname)s:'
193
 
                            ' %(message)s'))
194
 
    logger.addHandler(syslogger)
195
 
 
196
 
    if debug:
197
 
        console = logging.StreamHandler()
198
 
        console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
199
 
                                               ' [%(process)d]:'
200
 
                                               ' %(levelname)s:'
201
 
                                               ' %(message)s'))
202
 
        logger.addHandler(console)
203
 
    logger.setLevel(level)
204
 
 
205
 
 
206
 
class PGPError(Exception):
207
 
    """Exception if encryption/decryption fails"""
208
 
    pass
209
 
 
210
 
 
211
 
class PGPEngine:
212
 
    """A simple class for OpenPGP symmetric encryption & decryption"""
213
 
 
214
 
    def __init__(self):
215
 
        self.tempdir = tempfile.mkdtemp(prefix="mandos-")
216
 
        self.gpg = "gpg"
217
 
        try:
218
 
            output = subprocess.check_output(["gpgconf"])
219
 
            for line in output.splitlines():
220
 
                name, text, path = line.split(b":")
221
 
                if name == b"gpg":
222
 
                    self.gpg = path
223
 
                    break
224
 
        except OSError as e:
225
 
            if e.errno != errno.ENOENT:
226
 
                raise
227
 
        self.gnupgargs = ['--batch',
228
 
                          '--homedir', self.tempdir,
229
 
                          '--force-mdc',
230
 
                          '--quiet']
231
 
        # Only GPG version 1 has the --no-use-agent option.
232
 
        if self.gpg == b"gpg" or self.gpg.endswith(b"/gpg"):
233
 
            self.gnupgargs.append("--no-use-agent")
234
 
 
235
 
    def __enter__(self):
236
 
        return self
237
 
 
238
 
    def __exit__(self, exc_type, exc_value, traceback):
239
 
        self._cleanup()
240
 
        return False
241
 
 
242
 
    def __del__(self):
243
 
        self._cleanup()
244
 
 
245
 
    def _cleanup(self):
246
 
        if self.tempdir is not None:
247
 
            # Delete contents of tempdir
248
 
            for root, dirs, files in os.walk(self.tempdir,
249
 
                                             topdown=False):
250
 
                for filename in files:
251
 
                    os.remove(os.path.join(root, filename))
252
 
                for dirname in dirs:
253
 
                    os.rmdir(os.path.join(root, dirname))
254
 
            # Remove tempdir
255
 
            os.rmdir(self.tempdir)
256
 
            self.tempdir = None
257
 
 
258
 
    def password_encode(self, password):
259
 
        # Passphrase can not be empty and can not contain newlines or
260
 
        # NUL bytes.  So we prefix it and hex encode it.
261
 
        encoded = b"mandos" + binascii.hexlify(password)
262
 
        if len(encoded) > 2048:
263
 
            # GnuPG can't handle long passwords, so encode differently
264
 
            encoded = (b"mandos" + password.replace(b"\\", b"\\\\")
265
 
                       .replace(b"\n", b"\\n")
266
 
                       .replace(b"\0", b"\\x00"))
267
 
        return encoded
268
 
 
269
 
    def encrypt(self, data, password):
270
 
        passphrase = self.password_encode(password)
271
 
        with tempfile.NamedTemporaryFile(
272
 
                dir=self.tempdir) as passfile:
273
 
            passfile.write(passphrase)
274
 
            passfile.flush()
275
 
            proc = subprocess.Popen([self.gpg, '--symmetric',
276
 
                                     '--passphrase-file',
277
 
                                     passfile.name]
278
 
                                    + self.gnupgargs,
279
 
                                    stdin=subprocess.PIPE,
280
 
                                    stdout=subprocess.PIPE,
281
 
                                    stderr=subprocess.PIPE)
282
 
            ciphertext, err = proc.communicate(input=data)
283
 
        if proc.returncode != 0:
284
 
            raise PGPError(err)
285
 
        return ciphertext
286
 
 
287
 
    def decrypt(self, data, password):
288
 
        passphrase = self.password_encode(password)
289
 
        with tempfile.NamedTemporaryFile(
290
 
                dir=self.tempdir) as passfile:
291
 
            passfile.write(passphrase)
292
 
            passfile.flush()
293
 
            proc = subprocess.Popen([self.gpg, '--decrypt',
294
 
                                     '--passphrase-file',
295
 
                                     passfile.name]
296
 
                                    + self.gnupgargs,
297
 
                                    stdin=subprocess.PIPE,
298
 
                                    stdout=subprocess.PIPE,
299
 
                                    stderr=subprocess.PIPE)
300
 
            decrypted_plaintext, err = proc.communicate(input=data)
301
 
        if proc.returncode != 0:
302
 
            raise PGPError(err)
303
 
        return decrypted_plaintext
304
 
 
305
 
 
306
 
# Pretend that we have an Avahi module
307
 
class avahi:
308
 
    """This isn't so much a class as it is a module-like namespace."""
309
 
    IF_UNSPEC = -1               # avahi-common/address.h
310
 
    PROTO_UNSPEC = -1            # avahi-common/address.h
311
 
    PROTO_INET = 0               # avahi-common/address.h
312
 
    PROTO_INET6 = 1              # avahi-common/address.h
313
 
    DBUS_NAME = "org.freedesktop.Avahi"
314
 
    DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"
315
 
    DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"
316
 
    DBUS_PATH_SERVER = "/"
317
 
 
318
 
    @staticmethod
319
 
    def string_array_to_txt_array(t):
320
 
        return dbus.Array((dbus.ByteArray(s.encode("utf-8"))
321
 
                           for s in t), signature="ay")
322
 
    ENTRY_GROUP_ESTABLISHED = 2  # avahi-common/defs.h
323
 
    ENTRY_GROUP_COLLISION = 3    # avahi-common/defs.h
324
 
    ENTRY_GROUP_FAILURE = 4      # avahi-common/defs.h
325
 
    SERVER_INVALID = 0           # avahi-common/defs.h
326
 
    SERVER_REGISTERING = 1       # avahi-common/defs.h
327
 
    SERVER_RUNNING = 2           # avahi-common/defs.h
328
 
    SERVER_COLLISION = 3         # avahi-common/defs.h
329
 
    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
330
83
 
331
84
 
332
85
class AvahiError(Exception):
333
 
    def __init__(self, value, *args, **kwargs):
 
86
    def __init__(self, value):
334
87
        self.value = value
335
 
        return super(AvahiError, self).__init__(value, *args,
336
 
                                                **kwargs)
337
 
 
 
88
    def __str__(self):
 
89
        return repr(self.value)
338
90
 
339
91
class AvahiServiceError(AvahiError):
340
92
    pass
341
93
 
342
 
 
343
94
class AvahiGroupError(AvahiError):
344
95
    pass
345
96
 
346
97
 
347
 
class AvahiService:
348
 
    """An Avahi (Zeroconf) service.
349
 
 
350
 
    Attributes:
 
98
class AvahiService(object):
 
99
    """
351
100
    interface: integer; avahi.IF_UNSPEC or an interface index.
352
101
               Used to optionally bind to the specified interface.
353
 
    name: string; Example: 'Mandos'
354
 
    type: string; Example: '_mandos._tcp'.
355
 
     See <https://www.iana.org/assignments/service-names-port-numbers>
356
 
    port: integer; what port to announce
357
 
    TXT: list of strings; TXT record for the service
358
 
    domain: string; Domain to publish on, default to .local if empty.
359
 
    host: string; Host to publish records for, default is localhost
360
 
    max_renames: integer; maximum number of renames
361
 
    rename_count: integer; counter so we only rename after collisions
362
 
                  a sensible number of times
363
 
    group: D-Bus Entry Group
364
 
    server: D-Bus Server
365
 
    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
366
113
    """
367
 
 
368
 
    def __init__(self,
369
 
                 interface=avahi.IF_UNSPEC,
370
 
                 name=None,
371
 
                 servicetype=None,
372
 
                 port=None,
373
 
                 TXT=None,
374
 
                 domain="",
375
 
                 host="",
376
 
                 max_renames=32768,
377
 
                 protocol=avahi.PROTO_UNSPEC,
378
 
                 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. """
379
118
        self.interface = interface
380
119
        self.name = name
381
 
        self.type = servicetype
 
120
        self.type = type
382
121
        self.port = port
383
 
        self.TXT = TXT if TXT is not None else []
 
122
        if TXT is None:
 
123
            self.TXT = []
 
124
        else:
 
125
            self.TXT = TXT
384
126
        self.domain = domain
385
127
        self.host = host
386
128
        self.rename_count = 0
387
 
        self.max_renames = max_renames
388
 
        self.protocol = protocol
389
 
        self.group = None       # our entry group
390
 
        self.server = None
391
 
        self.bus = bus
392
 
        self.entry_group_state_changed_match = None
393
 
 
394
 
    def rename(self, remove=True):
 
129
    def rename(self):
395
130
        """Derived from the Avahi example code"""
396
131
        if self.rename_count >= self.max_renames:
397
 
            logger.critical("No suitable Zeroconf service name found"
398
 
                            " after %i retries, exiting.",
399
 
                            self.rename_count)
 
132
            logger.critical(u"No suitable service name found after %i"
 
133
                            u" retries, exiting.", rename_count)
400
134
            raise AvahiServiceError("Too many renames")
401
 
        self.name = str(
402
 
            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()
403
139
        self.rename_count += 1
404
 
        logger.info("Changing Zeroconf service name to %r ...",
405
 
                    self.name)
406
 
        if remove:
407
 
            self.remove()
408
 
        try:
409
 
            self.add()
410
 
        except dbus.exceptions.DBusException as error:
411
 
            if (error.get_dbus_name()
412
 
                == "org.freedesktop.Avahi.CollisionError"):
413
 
                logger.info("Local Zeroconf service name collision.")
414
 
                return self.rename(remove=False)
415
 
            else:
416
 
                logger.critical("D-Bus Exception", exc_info=error)
417
 
                self.cleanup()
418
 
                os._exit(1)
419
 
 
420
140
    def remove(self):
421
141
        """Derived from the Avahi example code"""
422
 
        if self.entry_group_state_changed_match is not None:
423
 
            self.entry_group_state_changed_match.remove()
424
 
            self.entry_group_state_changed_match = None
425
 
        if self.group is not None:
426
 
            self.group.Reset()
427
 
 
 
142
        if group is not None:
 
143
            group.Reset()
428
144
    def add(self):
429
145
        """Derived from the Avahi example code"""
430
 
        self.remove()
431
 
        if self.group is None:
432
 
            self.group = dbus.Interface(
433
 
                self.bus.get_object(avahi.DBUS_NAME,
434
 
                                    self.server.EntryGroupNew()),
435
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
436
 
        self.entry_group_state_changed_match = (
437
 
            self.group.connect_to_signal(
438
 
                'StateChanged', self.entry_group_state_changed))
439
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
440
 
                     self.name, self.type)
441
 
        self.group.AddService(
442
 
            self.interface,
443
 
            self.protocol,
444
 
            dbus.UInt32(0),     # flags
445
 
            self.name, self.type,
446
 
            self.domain, self.host,
447
 
            dbus.UInt16(self.port),
448
 
            avahi.string_array_to_txt_array(self.TXT))
449
 
        self.group.Commit()
450
 
 
451
 
    def entry_group_state_changed(self, state, error):
452
 
        """Derived from the Avahi example code"""
453
 
        logger.debug("Avahi entry group state change: %i", state)
454
 
 
455
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
456
 
            logger.debug("Zeroconf service established.")
457
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
458
 
            logger.info("Zeroconf service name collision.")
459
 
            self.rename()
460
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
461
 
            logger.critical("Avahi: Error in group state changed %s",
462
 
                            str(error))
463
 
            raise AvahiGroupError("State changed: {!s}".format(error))
464
 
 
465
 
    def cleanup(self):
466
 
        """Derived from the Avahi example code"""
467
 
        if self.group is not None:
468
 
            try:
469
 
                self.group.Free()
470
 
            except (dbus.exceptions.UnknownMethodException,
471
 
                    dbus.exceptions.DBusException):
472
 
                pass
473
 
            self.group = None
474
 
        self.remove()
475
 
 
476
 
    def server_state_changed(self, state, error=None):
477
 
        """Derived from the Avahi example code"""
478
 
        logger.debug("Avahi server state change: %i", state)
479
 
        bad_states = {
480
 
            avahi.SERVER_INVALID: "Zeroconf server invalid",
481
 
            avahi.SERVER_REGISTERING: None,
482
 
            avahi.SERVER_COLLISION: "Zeroconf server name collision",
483
 
            avahi.SERVER_FAILURE: "Zeroconf server failure",
484
 
        }
485
 
        if state in bad_states:
486
 
            if bad_states[state] is not None:
487
 
                if error is None:
488
 
                    logger.error(bad_states[state])
489
 
                else:
490
 
                    logger.error(bad_states[state] + ": %r", error)
491
 
            self.cleanup()
492
 
        elif state == avahi.SERVER_RUNNING:
493
 
            try:
494
 
                self.add()
495
 
            except dbus.exceptions.DBusException as error:
496
 
                if (error.get_dbus_name()
497
 
                    == "org.freedesktop.Avahi.CollisionError"):
498
 
                    logger.info("Local Zeroconf service name"
499
 
                                " collision.")
500
 
                    return self.rename(remove=False)
501
 
                else:
502
 
                    logger.critical("D-Bus Exception", exc_info=error)
503
 
                    self.cleanup()
504
 
                    os._exit(1)
505
 
        else:
506
 
            if error is None:
507
 
                logger.debug("Unknown state: %r", state)
508
 
            else:
509
 
                logger.debug("Unknown state: %r: %r", state, error)
510
 
 
511
 
    def activate(self):
512
 
        """Derived from the Avahi example code"""
513
 
        if self.server is None:
514
 
            self.server = dbus.Interface(
515
 
                self.bus.get_object(avahi.DBUS_NAME,
516
 
                                    avahi.DBUS_PATH_SERVER,
517
 
                                    follow_name_owner_changes=True),
518
 
                avahi.DBUS_INTERFACE_SERVER)
519
 
        self.server.connect_to_signal("StateChanged",
520
 
                                      self.server_state_changed)
521
 
        self.server_state_changed(self.server.GetState())
522
 
 
523
 
 
524
 
class AvahiServiceToSyslog(AvahiService):
525
 
    def rename(self, *args, **kwargs):
526
 
        """Add the new name to the syslog messages"""
527
 
        ret = super(AvahiServiceToSyslog, self).rename(*args,
528
 
                                                       **kwargs)
529
 
        syslogger.setFormatter(logging.Formatter(
530
 
            'Mandos ({}) [%(process)d]: %(levelname)s: %(message)s'
531
 
            .format(self.name)))
532
 
        return ret
533
 
 
534
 
 
535
 
# Pretend that we have a GnuTLS module
536
 
class gnutls:
537
 
    """This isn't so much a class as it is a module-like namespace."""
538
 
 
539
 
    library = ctypes.util.find_library("gnutls")
540
 
    if library is None:
541
 
        library = ctypes.util.find_library("gnutls-deb0")
542
 
    _library = ctypes.cdll.LoadLibrary(library)
543
 
    del library
544
 
 
545
 
    # Unless otherwise indicated, the constants and types below are
546
 
    # all from the gnutls/gnutls.h C header file.
547
 
 
548
 
    # Constants
549
 
    E_SUCCESS = 0
550
 
    E_INTERRUPTED = -52
551
 
    E_AGAIN = -28
552
 
    CRT_OPENPGP = 2
553
 
    CRT_RAWPK = 3
554
 
    CLIENT = 2
555
 
    SHUT_RDWR = 0
556
 
    CRD_CERTIFICATE = 1
557
 
    E_NO_CERTIFICATE_FOUND = -49
558
 
    X509_FMT_DER = 0
559
 
    NO_TICKETS = 1<<10
560
 
    ENABLE_RAWPK = 1<<18
561
 
    CTYPE_PEERS = 3
562
 
    KEYID_USE_SHA256 = 1        # gnutls/x509.h
563
 
    OPENPGP_FMT_RAW = 0         # gnutls/openpgp.h
564
 
 
565
 
    # Types
566
 
    class session_int(ctypes.Structure):
567
 
        _fields_ = []
568
 
    session_t = ctypes.POINTER(session_int)
569
 
 
570
 
    class certificate_credentials_st(ctypes.Structure):
571
 
        _fields_ = []
572
 
    certificate_credentials_t = ctypes.POINTER(
573
 
        certificate_credentials_st)
574
 
    certificate_type_t = ctypes.c_int
575
 
 
576
 
    class datum_t(ctypes.Structure):
577
 
        _fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),
578
 
                    ('size', ctypes.c_uint)]
579
 
 
580
 
    class openpgp_crt_int(ctypes.Structure):
581
 
        _fields_ = []
582
 
    openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)
583
 
    openpgp_crt_fmt_t = ctypes.c_int  # gnutls/openpgp.h
584
 
    log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)
585
 
    credentials_type_t = ctypes.c_int
586
 
    transport_ptr_t = ctypes.c_void_p
587
 
    close_request_t = ctypes.c_int
588
 
 
589
 
    # Exceptions
590
 
    class Error(Exception):
591
 
        def __init__(self, message=None, code=None, args=()):
592
 
            # Default usage is by a message string, but if a return
593
 
            # code is passed, convert it to a string with
594
 
            # gnutls.strerror()
595
 
            self.code = code
596
 
            if message is None and code is not None:
597
 
                message = gnutls.strerror(code)
598
 
            return super(gnutls.Error, self).__init__(
599
 
                message, *args)
600
 
 
601
 
    class CertificateSecurityError(Error):
602
 
        pass
603
 
 
604
 
    # Classes
605
 
    class Credentials:
606
 
        def __init__(self):
607
 
            self._c_object = gnutls.certificate_credentials_t()
608
 
            gnutls.certificate_allocate_credentials(
609
 
                ctypes.byref(self._c_object))
610
 
            self.type = gnutls.CRD_CERTIFICATE
611
 
 
612
 
        def __del__(self):
613
 
            gnutls.certificate_free_credentials(self._c_object)
614
 
 
615
 
    class ClientSession:
616
 
        def __init__(self, socket, credentials=None):
617
 
            self._c_object = gnutls.session_t()
618
 
            gnutls_flags = gnutls.CLIENT
619
 
            if gnutls.check_version(b"3.5.6"):
620
 
                gnutls_flags |= gnutls.NO_TICKETS
621
 
            if gnutls.has_rawpk:
622
 
                gnutls_flags |= gnutls.ENABLE_RAWPK
623
 
            gnutls.init(ctypes.byref(self._c_object), gnutls_flags)
624
 
            del gnutls_flags
625
 
            gnutls.set_default_priority(self._c_object)
626
 
            gnutls.transport_set_ptr(self._c_object, socket.fileno())
627
 
            gnutls.handshake_set_private_extensions(self._c_object,
628
 
                                                    True)
629
 
            self.socket = socket
630
 
            if credentials is None:
631
 
                credentials = gnutls.Credentials()
632
 
            gnutls.credentials_set(self._c_object, credentials.type,
633
 
                                   ctypes.cast(credentials._c_object,
634
 
                                               ctypes.c_void_p))
635
 
            self.credentials = credentials
636
 
 
637
 
        def __del__(self):
638
 
            gnutls.deinit(self._c_object)
639
 
 
640
 
        def handshake(self):
641
 
            return gnutls.handshake(self._c_object)
642
 
 
643
 
        def send(self, data):
644
 
            data = bytes(data)
645
 
            data_len = len(data)
646
 
            while data_len > 0:
647
 
                data_len -= gnutls.record_send(self._c_object,
648
 
                                               data[-data_len:],
649
 
                                               data_len)
650
 
 
651
 
        def bye(self):
652
 
            return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)
653
 
 
654
 
    # Error handling functions
655
 
    def _error_code(result):
656
 
        """A function to raise exceptions on errors, suitable
657
 
        for the 'restype' attribute on ctypes functions"""
658
 
        if result >= 0:
659
 
            return result
660
 
        if result == gnutls.E_NO_CERTIFICATE_FOUND:
661
 
            raise gnutls.CertificateSecurityError(code=result)
662
 
        raise gnutls.Error(code=result)
663
 
 
664
 
    def _retry_on_error(result, func, arguments):
665
 
        """A function to retry on some errors, suitable
666
 
        for the 'errcheck' attribute on ctypes functions"""
667
 
        while result < 0:
668
 
            if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):
669
 
                return _error_code(result)
670
 
            result = func(*arguments)
671
 
        return result
672
 
 
673
 
    # Unless otherwise indicated, the function declarations below are
674
 
    # all from the gnutls/gnutls.h C header file.
675
 
 
676
 
    # Functions
677
 
    priority_set_direct = _library.gnutls_priority_set_direct
678
 
    priority_set_direct.argtypes = [session_t, ctypes.c_char_p,
679
 
                                    ctypes.POINTER(ctypes.c_char_p)]
680
 
    priority_set_direct.restype = _error_code
681
 
 
682
 
    init = _library.gnutls_init
683
 
    init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]
684
 
    init.restype = _error_code
685
 
 
686
 
    set_default_priority = _library.gnutls_set_default_priority
687
 
    set_default_priority.argtypes = [session_t]
688
 
    set_default_priority.restype = _error_code
689
 
 
690
 
    record_send = _library.gnutls_record_send
691
 
    record_send.argtypes = [session_t, ctypes.c_void_p,
692
 
                            ctypes.c_size_t]
693
 
    record_send.restype = ctypes.c_ssize_t
694
 
    record_send.errcheck = _retry_on_error
695
 
 
696
 
    certificate_allocate_credentials = (
697
 
        _library.gnutls_certificate_allocate_credentials)
698
 
    certificate_allocate_credentials.argtypes = [
699
 
        ctypes.POINTER(certificate_credentials_t)]
700
 
    certificate_allocate_credentials.restype = _error_code
701
 
 
702
 
    certificate_free_credentials = (
703
 
        _library.gnutls_certificate_free_credentials)
704
 
    certificate_free_credentials.argtypes = [
705
 
        certificate_credentials_t]
706
 
    certificate_free_credentials.restype = None
707
 
 
708
 
    handshake_set_private_extensions = (
709
 
        _library.gnutls_handshake_set_private_extensions)
710
 
    handshake_set_private_extensions.argtypes = [session_t,
711
 
                                                 ctypes.c_int]
712
 
    handshake_set_private_extensions.restype = None
713
 
 
714
 
    credentials_set = _library.gnutls_credentials_set
715
 
    credentials_set.argtypes = [session_t, credentials_type_t,
716
 
                                ctypes.c_void_p]
717
 
    credentials_set.restype = _error_code
718
 
 
719
 
    strerror = _library.gnutls_strerror
720
 
    strerror.argtypes = [ctypes.c_int]
721
 
    strerror.restype = ctypes.c_char_p
722
 
 
723
 
    certificate_type_get = _library.gnutls_certificate_type_get
724
 
    certificate_type_get.argtypes = [session_t]
725
 
    certificate_type_get.restype = _error_code
726
 
 
727
 
    certificate_get_peers = _library.gnutls_certificate_get_peers
728
 
    certificate_get_peers.argtypes = [session_t,
729
 
                                      ctypes.POINTER(ctypes.c_uint)]
730
 
    certificate_get_peers.restype = ctypes.POINTER(datum_t)
731
 
 
732
 
    global_set_log_level = _library.gnutls_global_set_log_level
733
 
    global_set_log_level.argtypes = [ctypes.c_int]
734
 
    global_set_log_level.restype = None
735
 
 
736
 
    global_set_log_function = _library.gnutls_global_set_log_function
737
 
    global_set_log_function.argtypes = [log_func]
738
 
    global_set_log_function.restype = None
739
 
 
740
 
    deinit = _library.gnutls_deinit
741
 
    deinit.argtypes = [session_t]
742
 
    deinit.restype = None
743
 
 
744
 
    handshake = _library.gnutls_handshake
745
 
    handshake.argtypes = [session_t]
746
 
    handshake.restype = _error_code
747
 
    handshake.errcheck = _retry_on_error
748
 
 
749
 
    transport_set_ptr = _library.gnutls_transport_set_ptr
750
 
    transport_set_ptr.argtypes = [session_t, transport_ptr_t]
751
 
    transport_set_ptr.restype = None
752
 
 
753
 
    bye = _library.gnutls_bye
754
 
    bye.argtypes = [session_t, close_request_t]
755
 
    bye.restype = _error_code
756
 
    bye.errcheck = _retry_on_error
757
 
 
758
 
    check_version = _library.gnutls_check_version
759
 
    check_version.argtypes = [ctypes.c_char_p]
760
 
    check_version.restype = ctypes.c_char_p
761
 
 
762
 
    _need_version = b"3.3.0"
763
 
    if check_version(_need_version) is None:
764
 
        raise self.Error("Needs GnuTLS {} or later"
765
 
                         .format(_need_version))
766
 
 
767
 
    _tls_rawpk_version = b"3.6.6"
768
 
    has_rawpk = bool(check_version(_tls_rawpk_version))
769
 
 
770
 
    if has_rawpk:
771
 
        # Types
772
 
        class pubkey_st(ctypes.Structure):
773
 
            _fields = []
774
 
        pubkey_t = ctypes.POINTER(pubkey_st)
775
 
 
776
 
        x509_crt_fmt_t = ctypes.c_int
777
 
 
778
 
        # All the function declarations below are from
779
 
        # gnutls/abstract.h
780
 
        pubkey_init = _library.gnutls_pubkey_init
781
 
        pubkey_init.argtypes = [ctypes.POINTER(pubkey_t)]
782
 
        pubkey_init.restype = _error_code
783
 
 
784
 
        pubkey_import = _library.gnutls_pubkey_import
785
 
        pubkey_import.argtypes = [pubkey_t, ctypes.POINTER(datum_t),
786
 
                                  x509_crt_fmt_t]
787
 
        pubkey_import.restype = _error_code
788
 
 
789
 
        pubkey_get_key_id = _library.gnutls_pubkey_get_key_id
790
 
        pubkey_get_key_id.argtypes = [pubkey_t, ctypes.c_int,
791
 
                                      ctypes.POINTER(ctypes.c_ubyte),
792
 
                                      ctypes.POINTER(ctypes.c_size_t)]
793
 
        pubkey_get_key_id.restype = _error_code
794
 
 
795
 
        pubkey_deinit = _library.gnutls_pubkey_deinit
796
 
        pubkey_deinit.argtypes = [pubkey_t]
797
 
        pubkey_deinit.restype = None
798
 
    else:
799
 
        # All the function declarations below are from
800
 
        # gnutls/openpgp.h
801
 
 
802
 
        openpgp_crt_init = _library.gnutls_openpgp_crt_init
803
 
        openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]
804
 
        openpgp_crt_init.restype = _error_code
805
 
 
806
 
        openpgp_crt_import = _library.gnutls_openpgp_crt_import
807
 
        openpgp_crt_import.argtypes = [openpgp_crt_t,
808
 
                                       ctypes.POINTER(datum_t),
809
 
                                       openpgp_crt_fmt_t]
810
 
        openpgp_crt_import.restype = _error_code
811
 
 
812
 
        openpgp_crt_verify_self = \
813
 
            _library.gnutls_openpgp_crt_verify_self
814
 
        openpgp_crt_verify_self.argtypes = [
815
 
            openpgp_crt_t,
816
 
            ctypes.c_uint,
817
 
            ctypes.POINTER(ctypes.c_uint),
818
 
        ]
819
 
        openpgp_crt_verify_self.restype = _error_code
820
 
 
821
 
        openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit
822
 
        openpgp_crt_deinit.argtypes = [openpgp_crt_t]
823
 
        openpgp_crt_deinit.restype = None
824
 
 
825
 
        openpgp_crt_get_fingerprint = (
826
 
            _library.gnutls_openpgp_crt_get_fingerprint)
827
 
        openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,
828
 
                                                ctypes.c_void_p,
829
 
                                                ctypes.POINTER(
830
 
                                                    ctypes.c_size_t)]
831
 
        openpgp_crt_get_fingerprint.restype = _error_code
832
 
 
833
 
    if check_version(b"3.6.4"):
834
 
        certificate_type_get2 = _library.gnutls_certificate_type_get2
835
 
        certificate_type_get2.argtypes = [session_t, ctypes.c_int]
836
 
        certificate_type_get2.restype = _error_code
837
 
 
838
 
    # Remove non-public functions
839
 
    del _error_code, _retry_on_error
840
 
 
841
 
 
842
 
def call_pipe(connection,       # : multiprocessing.Connection
843
 
              func, *args, **kwargs):
844
 
    """This function is meant to be called by multiprocessing.Process
845
 
 
846
 
    This function runs func(*args, **kwargs), and writes the resulting
847
 
    return value on the provided multiprocessing.Connection.
848
 
    """
849
 
    connection.send(func(*args, **kwargs))
850
 
    connection.close()
851
 
 
852
 
 
853
 
class Client:
 
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
 
169
 
 
170
 
 
171
class Client(object):
854
172
    """A representation of a client host served by this server.
855
 
 
856
173
    Attributes:
857
 
    approved:   bool(); 'None' if not yet approved/disapproved
858
 
    approval_delay: datetime.timedelta(); Time to wait for approval
859
 
    approval_duration: datetime.timedelta(); Duration of one approval
860
 
    checker: multiprocessing.Process(); a running checker process used
861
 
             to see if the client lives. 'None' if no process is
862
 
             running.
863
 
    checker_callback_tag: a GLib event source tag, or None
864
 
    checker_command: string; External command which is run to check
865
 
                     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
866
193
                     runtime with vars(self) as dict, so that for
867
194
                     instance %(name)s can be used in the command.
868
 
    checker_initiator_tag: a GLib event source tag, or None
869
 
    created:    datetime.datetime(); (UTC) object creation
870
 
    client_structure: Object describing what attributes a client has
871
 
                      and is used for storing the client at exit
872
 
    current_checker_command: string; current running checker_command
873
 
    disable_initiator_tag: a GLib event source tag, or None
874
 
    enabled:    bool()
875
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
876
 
                 uniquely identify an OpenPGP client
877
 
    key_id: string (64 hexadecimal digits); used to uniquely identify
878
 
            a client using raw public keys
879
 
    host:       string; available for use by the checker command
880
 
    interval:   datetime.timedelta(); How often to start a new checker
881
 
    last_approval_request: datetime.datetime(); (UTC) or None
882
 
    last_checked_ok: datetime.datetime(); (UTC) or None
883
 
    last_checker_status: integer between 0 and 255 reflecting exit
884
 
                         status of last checker. -1 reflects crashed
885
 
                         checker, -2 means no checker completed yet.
886
 
    last_checker_signal: The signal which killed the last checker, if
887
 
                         last_checker_status is -1
888
 
    last_enabled: datetime.datetime(); (UTC) or None
889
 
    name:       string; from the config file, used in log messages and
890
 
                        D-Bus identifiers
891
 
    secret:     bytestring; sent verbatim (over TLS) to client
892
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
893
 
                                      until this client is disabled
894
 
    extended_timeout:   extra long timeout when secret has been sent
895
 
    runtime_expansions: Allowed attributes for runtime expansion.
896
 
    expires:    datetime.datetime(); time (UTC) when a client will be
897
 
                disabled, or None
898
 
    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: - '' -
899
200
    """
900
 
 
901
 
    runtime_expansions = ("approval_delay", "approval_duration",
902
 
                          "created", "enabled", "expires", "key_id",
903
 
                          "fingerprint", "host", "interval",
904
 
                          "last_approval_request", "last_checked_ok",
905
 
                          "last_enabled", "name", "timeout")
906
 
    client_defaults = {
907
 
        "timeout": "PT5M",
908
 
        "extended_timeout": "PT15M",
909
 
        "interval": "PT2M",
910
 
        "checker": "fping -q -- %%(host)s",
911
 
        "host": "",
912
 
        "approval_delay": "PT0S",
913
 
        "approval_duration": "PT1S",
914
 
        "approved_by_default": "True",
915
 
        "enabled": "True",
916
 
    }
917
 
 
918
 
    @staticmethod
919
 
    def config_parser(config):
920
 
        """Construct a new dict of client settings of this form:
921
 
        { client_name: {setting_name: value, ...}, ...}
922
 
        with exceptions for any special settings as defined above.
923
 
        NOTE: Must be a pure function. Must return the same result
924
 
        value given the same arguments.
925
 
        """
926
 
        settings = {}
927
 
        for client_name in config.sections():
928
 
            section = dict(config.items(client_name))
929
 
            client = settings[client_name] = {}
930
 
 
931
 
            client["host"] = section["host"]
932
 
            # Reformat values from string types to Python types
933
 
            client["approved_by_default"] = config.getboolean(
934
 
                client_name, "approved_by_default")
935
 
            client["enabled"] = config.getboolean(client_name,
936
 
                                                  "enabled")
937
 
 
938
 
            # Uppercase and remove spaces from key_id and fingerprint
939
 
            # for later comparison purposes with return value from the
940
 
            # key_id() and fingerprint() functions
941
 
            client["key_id"] = (section.get("key_id", "").upper()
942
 
                                .replace(" ", ""))
943
 
            client["fingerprint"] = (section["fingerprint"].upper()
944
 
                                     .replace(" ", ""))
945
 
            if "secret" in section:
946
 
                client["secret"] = codecs.decode(section["secret"]
947
 
                                                 .encode("utf-8"),
948
 
                                                 "base64")
949
 
            elif "secfile" in section:
950
 
                with open(os.path.expanduser(os.path.expandvars
951
 
                                             (section["secfile"])),
952
 
                          "rb") as secfile:
953
 
                    client["secret"] = secfile.read()
954
 
            else:
955
 
                raise TypeError("No secret or secfile for section {}"
956
 
                                .format(section))
957
 
            client["timeout"] = string_to_delta(section["timeout"])
958
 
            client["extended_timeout"] = string_to_delta(
959
 
                section["extended_timeout"])
960
 
            client["interval"] = string_to_delta(section["interval"])
961
 
            client["approval_delay"] = string_to_delta(
962
 
                section["approval_delay"])
963
 
            client["approval_duration"] = string_to_delta(
964
 
                section["approval_duration"])
965
 
            client["checker_command"] = section["checker"]
966
 
            client["last_approval_request"] = None
967
 
            client["last_checked_ok"] = None
968
 
            client["last_checker_status"] = -2
969
 
 
970
 
        return settings
971
 
 
972
 
    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.."""
973
229
        self.name = name
974
 
        if server_settings is None:
975
 
            server_settings = {}
976
 
        self.server_settings = server_settings
977
 
        # adding all client settings
978
 
        for setting, value in settings.items():
979
 
            setattr(self, setting, value)
980
 
 
981
 
        if self.enabled:
982
 
            if not hasattr(self, "last_enabled"):
983
 
                self.last_enabled = datetime.datetime.utcnow()
984
 
            if not hasattr(self, "expires"):
985
 
                self.expires = (datetime.datetime.utcnow()
986
 
                                + 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()
987
242
        else:
988
 
            self.last_enabled = None
989
 
            self.expires = None
990
 
 
991
 
        logger.debug("Creating client %r", self.name)
992
 
        logger.debug("  Key ID: %s", self.key_id)
993
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
994
 
        self.created = settings.get("created",
995
 
                                    datetime.datetime.utcnow())
996
 
 
997
 
        # 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
998
251
        self.checker = None
999
252
        self.checker_initiator_tag = None
1000
 
        self.disable_initiator_tag = None
 
253
        self.stop_initiator_tag = None
1001
254
        self.checker_callback_tag = None
1002
 
        self.current_checker_command = None
1003
 
        self.approved = None
1004
 
        self.approvals_pending = 0
1005
 
        self.changedstate = multiprocessing_manager.Condition(
1006
 
            multiprocessing_manager.Lock())
1007
 
        self.client_structure = [attr
1008
 
                                 for attr in self.__dict__.keys()
1009
 
                                 if not attr.startswith("_")]
1010
 
        self.client_structure.append("client_structure")
1011
 
 
1012
 
        for name, t in inspect.getmembers(
1013
 
                type(self), lambda obj: isinstance(obj, property)):
1014
 
            if not name.startswith("_"):
1015
 
                self.client_structure.append(name)
1016
 
 
1017
 
    # Send notice to process children that client state has changed
1018
 
    def send_changedstate(self):
1019
 
        with self.changedstate:
1020
 
            self.changedstate.notify_all()
1021
 
 
1022
 
    def enable(self):
 
255
        self.check_command = checker
 
256
    def start(self):
1023
257
        """Start this client's checker and timeout hooks"""
1024
 
        if getattr(self, "enabled", False):
1025
 
            # Already enabled
1026
 
            return
1027
 
        self.expires = datetime.datetime.utcnow() + self.timeout
1028
 
        self.enabled = True
1029
 
        self.last_enabled = datetime.datetime.utcnow()
1030
 
        self.init_checker()
1031
 
        self.send_changedstate()
1032
 
 
1033
 
    def disable(self, quiet=True):
1034
 
        """Disable this client."""
1035
 
        if not getattr(self, "enabled", False):
1036
 
            return False
1037
 
        if not quiet:
1038
 
            logger.info("Disabling client %s", self.name)
1039
 
        if getattr(self, "disable_initiator_tag", None) is not None:
1040
 
            GLib.source_remove(self.disable_initiator_tag)
1041
 
            self.disable_initiator_tag = None
1042
 
        self.expires = None
1043
 
        if getattr(self, "checker_initiator_tag", None) is not None:
1044
 
            GLib.source_remove(self.checker_initiator_tag)
1045
 
            self.checker_initiator_tag = None
1046
 
        self.stop_checker()
1047
 
        self.enabled = False
1048
 
        if not quiet:
1049
 
            self.send_changedstate()
1050
 
        # Do not run this again if called by a GLib.timeout_add
1051
 
        return False
1052
 
 
1053
 
    def __del__(self):
1054
 
        self.disable()
1055
 
 
1056
 
    def init_checker(self):
1057
258
        # Schedule a new checker to be started an 'interval' from now,
1058
259
        # and every interval from then on.
1059
 
        if self.checker_initiator_tag is not None:
1060
 
            GLib.source_remove(self.checker_initiator_tag)
1061
 
        self.checker_initiator_tag = GLib.timeout_add(
1062
 
            random.randrange(int(self.interval.total_seconds() * 1000
1063
 
                                 + 1)),
1064
 
            self.start_checker)
1065
 
        # Schedule a disable() when 'timeout' has passed
1066
 
        if self.disable_initiator_tag is not None:
1067
 
            GLib.source_remove(self.disable_initiator_tag)
1068
 
        self.disable_initiator_tag = GLib.timeout_add(
1069
 
            int(self.timeout.total_seconds() * 1000), self.disable)
 
260
        self.checker_initiator_tag = gobject.timeout_add\
 
261
                                     (self._interval_milliseconds,
 
262
                                      self.start_checker)
1070
263
        # Also start a new checker *right now*.
1071
264
        self.start_checker()
1072
 
 
1073
 
    def checker_callback(self, source, condition, connection,
1074
 
                         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):
1075
294
        """The checker has completed, so take appropriate actions."""
1076
 
        # Read return code from connection (see call_pipe)
1077
 
        returncode = connection.recv()
1078
 
        connection.close()
1079
 
        if self.checker is not None:
1080
 
            self.checker.join()
 
295
        now = datetime.datetime.now()
1081
296
        self.checker_callback_tag = None
1082
297
        self.checker = None
1083
 
 
1084
 
        if returncode >= 0:
1085
 
            self.last_checker_status = returncode
1086
 
            self.last_checker_signal = None
1087
 
            if self.last_checker_status == 0:
1088
 
                logger.info("Checker for %(name)s succeeded",
1089
 
                            vars(self))
1090
 
                self.checked_ok()
1091
 
            else:
1092
 
                logger.info("Checker for %(name)s failed", vars(self))
1093
 
        else:
1094
 
            self.last_checker_status = -1
1095
 
            self.last_checker_signal = -returncode
1096
 
            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?",
1097
309
                           vars(self))
1098
 
        return False
1099
 
 
1100
 
    def checked_ok(self):
1101
 
        """Assert that the client has been seen, alive and well."""
1102
 
        self.last_checked_ok = datetime.datetime.utcnow()
1103
 
        self.last_checker_status = 0
1104
 
        self.last_checker_signal = None
1105
 
        self.bump_timeout()
1106
 
 
1107
 
    def bump_timeout(self, timeout=None):
1108
 
        """Bump up the timeout for this client."""
1109
 
        if timeout is None:
1110
 
            timeout = self.timeout
1111
 
        if self.disable_initiator_tag is not None:
1112
 
            GLib.source_remove(self.disable_initiator_tag)
1113
 
            self.disable_initiator_tag = None
1114
 
        if getattr(self, "enabled", False):
1115
 
            self.disable_initiator_tag = GLib.timeout_add(
1116
 
                int(timeout.total_seconds() * 1000), self.disable)
1117
 
            self.expires = datetime.datetime.utcnow() + timeout
1118
 
 
1119
 
    def need_approval(self):
1120
 
        self.last_approval_request = datetime.datetime.utcnow()
1121
 
 
 
310
        else:
 
311
            logger.debug(u"Checker for %(name)s failed",
 
312
                         vars(self))
1122
313
    def start_checker(self):
1123
314
        """Start a new checker subprocess if one is not running.
1124
 
 
1125
315
        If a checker already exists, leave it running and do
1126
316
        nothing."""
1127
317
        # The reason for not killing a running checker is that if we
1128
 
        # did that, and if a checker (for some reason) started running
1129
 
        # slowly and taking more than 'interval' time, then the client
1130
 
        # would inevitably timeout, since no checker would get a
1131
 
        # 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
1132
322
        # checkers alone, the checker would have to take more time
1133
 
        # than 'timeout' for the client to be disabled, which is as it
1134
 
        # should be.
1135
 
 
1136
 
        if self.checker is not None and not self.checker.is_alive():
1137
 
            logger.warning("Checker was not alive; joining")
1138
 
            self.checker.join()
1139
 
            self.checker = None
1140
 
        # Start a new checker if needed
 
323
        # than 'timeout' for the client to be declared invalid, which
 
324
        # is as it should be.
1141
325
        if self.checker is None:
1142
 
            # Escape attributes for the shell
1143
 
            escaped_attrs = {
1144
 
                attr: shlex.quote(str(getattr(self, attr)))
1145
 
                for attr in self.runtime_expansions}
1146
 
            try:
1147
 
                command = self.checker_command % escaped_attrs
1148
 
            except TypeError as error:
1149
 
                logger.error('Could not format string "%s"',
1150
 
                             self.checker_command,
1151
 
                             exc_info=error)
1152
 
                return True     # Try again later
1153
 
            self.current_checker_command = command
1154
 
            logger.info("Starting checker %r for %s", command,
1155
 
                        self.name)
1156
 
            # We don't need to redirect stdout and stderr, since
1157
 
            # in normal mode, that is already done by daemon(),
1158
 
            # and in debug mode we don't want to.  (Stdin is
1159
 
            # always replaced by /dev/null.)
1160
 
            # The exception is when not debugging but nevertheless
1161
 
            # running in the foreground; use the previously
1162
 
            # created wnull.
1163
 
            popen_args = {"close_fds": True,
1164
 
                          "shell": True,
1165
 
                          "cwd": "/"}
1166
 
            if (not self.server_settings["debug"]
1167
 
                and self.server_settings["foreground"]):
1168
 
                popen_args.update({"stdout": wnull,
1169
 
                                   "stderr": wnull})
1170
 
            pipe = multiprocessing.Pipe(duplex=False)
1171
 
            self.checker = multiprocessing.Process(
1172
 
                target=call_pipe,
1173
 
                args=(pipe[1], subprocess.call, command),
1174
 
                kwargs=popen_args)
1175
 
            self.checker.start()
1176
 
            self.checker_callback_tag = GLib.io_add_watch(
1177
 
                GLib.IOChannel.unix_new(pipe[0].fileno()),
1178
 
                GLib.PRIORITY_DEFAULT, GLib.IO_IN,
1179
 
                self.checker_callback, pipe[0], command)
1180
 
        # 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
1181
353
        return True
1182
 
 
1183
354
    def stop_checker(self):
1184
355
        """Force the checker process, if any, to stop."""
1185
356
        if self.checker_callback_tag:
1186
 
            GLib.source_remove(self.checker_callback_tag)
 
357
            gobject.source_remove(self.checker_callback_tag)
1187
358
            self.checker_callback_tag = None
1188
359
        if getattr(self, "checker", None) is None:
1189
360
            return
1190
361
        logger.debug("Stopping checker for %(name)s", vars(self))
1191
 
        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
1192
370
        self.checker = None
1193
 
 
1194
 
 
1195
 
def dbus_service_property(dbus_interface,
1196
 
                          signature="v",
1197
 
                          access="readwrite",
1198
 
                          byte_arrays=False):
1199
 
    """Decorators for marking methods of a DBusObjectWithProperties to
1200
 
    become properties on the D-Bus.
1201
 
 
1202
 
    The decorated method will be called with no arguments by "Get"
1203
 
    and with one argument by "Set".
1204
 
 
1205
 
    The parameters, where they are supported, are the same as
1206
 
    dbus.service.method, except there is only "signature", since the
1207
 
    type from Get() and the type sent to Set() is the same.
1208
 
    """
1209
 
    # Encoding deeply encoded byte arrays is not supported yet by the
1210
 
    # "Set" method, so we fail early here:
1211
 
    if byte_arrays and signature != "ay":
1212
 
        raise ValueError("Byte arrays not supported for non-'ay'"
1213
 
                         " signature {!r}".format(signature))
1214
 
 
1215
 
    def decorator(func):
1216
 
        func._dbus_is_property = True
1217
 
        func._dbus_interface = dbus_interface
1218
 
        func._dbus_signature = signature
1219
 
        func._dbus_access = access
1220
 
        func._dbus_name = func.__name__
1221
 
        if func._dbus_name.endswith("_dbus_property"):
1222
 
            func._dbus_name = func._dbus_name[:-14]
1223
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays}
1224
 
        return func
1225
 
 
1226
 
    return decorator
1227
 
 
1228
 
 
1229
 
def dbus_interface_annotations(dbus_interface):
1230
 
    """Decorator for marking functions returning interface annotations
1231
 
 
1232
 
    Usage:
1233
 
 
1234
 
    @dbus_interface_annotations("org.example.Interface")
1235
 
    def _foo(self):  # Function name does not matter
1236
 
        return {"org.freedesktop.DBus.Deprecated": "true",
1237
 
                "org.freedesktop.DBus.Property.EmitsChangedSignal":
1238
 
                    "false"}
1239
 
    """
1240
 
 
1241
 
    def decorator(func):
1242
 
        func._dbus_is_interface = True
1243
 
        func._dbus_interface = dbus_interface
1244
 
        func._dbus_name = dbus_interface
1245
 
        return func
1246
 
 
1247
 
    return decorator
1248
 
 
1249
 
 
1250
 
def dbus_annotations(annotations):
1251
 
    """Decorator to annotate D-Bus methods, signals or properties
1252
 
    Usage:
1253
 
 
1254
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true",
1255
 
                       "org.freedesktop.DBus.Property."
1256
 
                       "EmitsChangedSignal": "false"})
1257
 
    @dbus_service_property("org.example.Interface", signature="b",
1258
 
                           access="r")
1259
 
    def Property_dbus_property(self):
1260
 
        return dbus.Boolean(False)
1261
 
 
1262
 
    See also the DBusObjectWithAnnotations class.
1263
 
    """
1264
 
 
1265
 
    def decorator(func):
1266
 
        func._dbus_annotations = annotations
1267
 
        return func
1268
 
 
1269
 
    return decorator
1270
 
 
1271
 
 
1272
 
class DBusPropertyException(dbus.exceptions.DBusException):
1273
 
    """A base class for D-Bus property-related exceptions
1274
 
    """
1275
 
    pass
1276
 
 
1277
 
 
1278
 
class DBusPropertyAccessException(DBusPropertyException):
1279
 
    """A property's access permissions disallows an operation.
1280
 
    """
1281
 
    pass
1282
 
 
1283
 
 
1284
 
class DBusPropertyNotFound(DBusPropertyException):
1285
 
    """An attempt was made to access a non-existing property.
1286
 
    """
1287
 
    pass
1288
 
 
1289
 
 
1290
 
class DBusObjectWithAnnotations(dbus.service.Object):
1291
 
    """A D-Bus object with annotations.
1292
 
 
1293
 
    Classes inheriting from this can use the dbus_annotations
1294
 
    decorator to add annotations to methods or signals.
1295
 
    """
1296
 
 
1297
 
    @staticmethod
1298
 
    def _is_dbus_thing(thing):
1299
 
        """Returns a function testing if an attribute is a D-Bus thing
1300
 
 
1301
 
        If called like _is_dbus_thing("method") it returns a function
1302
 
        suitable for use as predicate to inspect.getmembers().
1303
 
        """
1304
 
        return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),
1305
 
                                   False)
1306
 
 
1307
 
    def _get_all_dbus_things(self, thing):
1308
 
        """Returns a generator of (name, attribute) pairs
1309
 
        """
1310
 
        return ((getattr(athing.__get__(self), "_dbus_name", name),
1311
 
                 athing.__get__(self))
1312
 
                for cls in self.__class__.__mro__
1313
 
                for name, athing in
1314
 
                inspect.getmembers(cls, self._is_dbus_thing(thing)))
1315
 
 
1316
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1317
 
                         out_signature="s",
1318
 
                         path_keyword='object_path',
1319
 
                         connection_keyword='connection')
1320
 
    def Introspect(self, object_path, connection):
1321
 
        """Overloading of standard D-Bus method.
1322
 
 
1323
 
        Inserts annotation tags on methods and signals.
1324
 
        """
1325
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
1326
 
                                                   connection)
1327
 
        try:
1328
 
            document = xml.dom.minidom.parseString(xmlstring)
1329
 
 
1330
 
            for if_tag in document.getElementsByTagName("interface"):
1331
 
                # Add annotation tags
1332
 
                for typ in ("method", "signal"):
1333
 
                    for tag in if_tag.getElementsByTagName(typ):
1334
 
                        annots = dict()
1335
 
                        for name, prop in (self.
1336
 
                                           _get_all_dbus_things(typ)):
1337
 
                            if (name == tag.getAttribute("name")
1338
 
                                and prop._dbus_interface
1339
 
                                == if_tag.getAttribute("name")):
1340
 
                                annots.update(getattr(
1341
 
                                    prop, "_dbus_annotations", {}))
1342
 
                        for name, value in annots.items():
1343
 
                            ann_tag = document.createElement(
1344
 
                                "annotation")
1345
 
                            ann_tag.setAttribute("name", name)
1346
 
                            ann_tag.setAttribute("value", value)
1347
 
                            tag.appendChild(ann_tag)
1348
 
                # Add interface annotation tags
1349
 
                for annotation, value in dict(
1350
 
                    itertools.chain.from_iterable(
1351
 
                        annotations().items()
1352
 
                        for name, annotations
1353
 
                        in self._get_all_dbus_things("interface")
1354
 
                        if name == if_tag.getAttribute("name")
1355
 
                        )).items():
1356
 
                    ann_tag = document.createElement("annotation")
1357
 
                    ann_tag.setAttribute("name", annotation)
1358
 
                    ann_tag.setAttribute("value", value)
1359
 
                    if_tag.appendChild(ann_tag)
1360
 
                # Fix argument name for the Introspect method itself
1361
 
                if (if_tag.getAttribute("name")
1362
 
                    == dbus.INTROSPECTABLE_IFACE):
1363
 
                    for cn in if_tag.getElementsByTagName("method"):
1364
 
                        if cn.getAttribute("name") == "Introspect":
1365
 
                            for arg in cn.getElementsByTagName("arg"):
1366
 
                                if (arg.getAttribute("direction")
1367
 
                                    == "out"):
1368
 
                                    arg.setAttribute("name",
1369
 
                                                     "xml_data")
1370
 
            xmlstring = document.toxml("utf-8")
1371
 
            document.unlink()
1372
 
        except (AttributeError, xml.dom.DOMException,
1373
 
                xml.parsers.expat.ExpatError) as error:
1374
 
            logger.error("Failed to override Introspection method",
1375
 
                         exc_info=error)
1376
 
        return xmlstring
1377
 
 
1378
 
 
1379
 
class DBusObjectWithProperties(DBusObjectWithAnnotations):
1380
 
    """A D-Bus object with properties.
1381
 
 
1382
 
    Classes inheriting from this can use the dbus_service_property
1383
 
    decorator to expose methods as D-Bus properties.  It exposes the
1384
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
1385
 
    """
1386
 
 
1387
 
    def _get_dbus_property(self, interface_name, property_name):
1388
 
        """Returns a bound method if one exists which is a D-Bus
1389
 
        property with the specified name and interface.
1390
 
        """
1391
 
        for cls in self.__class__.__mro__:
1392
 
            for name, value in inspect.getmembers(
1393
 
                    cls, self._is_dbus_thing("property")):
1394
 
                if (value._dbus_name == property_name
1395
 
                    and value._dbus_interface == interface_name):
1396
 
                    return value.__get__(self)
1397
 
 
1398
 
        # No such property
1399
 
        raise DBusPropertyNotFound("{}:{}.{}".format(
1400
 
            self.dbus_object_path, interface_name, property_name))
1401
 
 
1402
 
    @classmethod
1403
 
    def _get_all_interface_names(cls):
1404
 
        """Get a sequence of all interfaces supported by an object"""
1405
 
        return (name for name in set(getattr(getattr(x, attr),
1406
 
                                             "_dbus_interface", None)
1407
 
                                     for x in (inspect.getmro(cls))
1408
 
                                     for attr in dir(x))
1409
 
                if name is not None)
1410
 
 
1411
 
    @dbus.service.method(dbus.PROPERTIES_IFACE,
1412
 
                         in_signature="ss",
1413
 
                         out_signature="v")
1414
 
    def Get(self, interface_name, property_name):
1415
 
        """Standard D-Bus property Get() method, see D-Bus standard.
1416
 
        """
1417
 
        prop = self._get_dbus_property(interface_name, property_name)
1418
 
        if prop._dbus_access == "write":
1419
 
            raise DBusPropertyAccessException(property_name)
1420
 
        value = prop()
1421
 
        if not hasattr(value, "variant_level"):
1422
 
            return value
1423
 
        return type(value)(value, variant_level=value.variant_level+1)
1424
 
 
1425
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
1426
 
    def Set(self, interface_name, property_name, value):
1427
 
        """Standard D-Bus property Set() method, see D-Bus standard.
1428
 
        """
1429
 
        prop = self._get_dbus_property(interface_name, property_name)
1430
 
        if prop._dbus_access == "read":
1431
 
            raise DBusPropertyAccessException(property_name)
1432
 
        if prop._dbus_get_args_options["byte_arrays"]:
1433
 
            # The byte_arrays option is not supported yet on
1434
 
            # signatures other than "ay".
1435
 
            if prop._dbus_signature != "ay":
1436
 
                raise ValueError("Byte arrays not supported for non-"
1437
 
                                 "'ay' signature {!r}"
1438
 
                                 .format(prop._dbus_signature))
1439
 
            value = dbus.ByteArray(bytes(value))
1440
 
        prop(value)
1441
 
 
1442
 
    @dbus.service.method(dbus.PROPERTIES_IFACE,
1443
 
                         in_signature="s",
1444
 
                         out_signature="a{sv}")
1445
 
    def GetAll(self, interface_name):
1446
 
        """Standard D-Bus property GetAll() method, see D-Bus
1447
 
        standard.
1448
 
 
1449
 
        Note: Will not include properties with access="write".
1450
 
        """
1451
 
        properties = {}
1452
 
        for name, prop in self._get_all_dbus_things("property"):
1453
 
            if (interface_name
1454
 
                and interface_name != prop._dbus_interface):
1455
 
                # Interface non-empty but did not match
1456
 
                continue
1457
 
            # Ignore write-only properties
1458
 
            if prop._dbus_access == "write":
1459
 
                continue
1460
 
            value = prop()
1461
 
            if not hasattr(value, "variant_level"):
1462
 
                properties[name] = value
1463
 
                continue
1464
 
            properties[name] = type(value)(
1465
 
                value, variant_level=value.variant_level + 1)
1466
 
        return dbus.Dictionary(properties, signature="sv")
1467
 
 
1468
 
    @dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")
1469
 
    def PropertiesChanged(self, interface_name, changed_properties,
1470
 
                          invalidated_properties):
1471
 
        """Standard D-Bus PropertiesChanged() signal, see D-Bus
1472
 
        standard.
1473
 
        """
1474
 
        pass
1475
 
 
1476
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1477
 
                         out_signature="s",
1478
 
                         path_keyword='object_path',
1479
 
                         connection_keyword='connection')
1480
 
    def Introspect(self, object_path, connection):
1481
 
        """Overloading of standard D-Bus method.
1482
 
 
1483
 
        Inserts property tags and interface annotation tags.
1484
 
        """
1485
 
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
1486
 
                                                         object_path,
1487
 
                                                         connection)
1488
 
        try:
1489
 
            document = xml.dom.minidom.parseString(xmlstring)
1490
 
 
1491
 
            def make_tag(document, name, prop):
1492
 
                e = document.createElement("property")
1493
 
                e.setAttribute("name", name)
1494
 
                e.setAttribute("type", prop._dbus_signature)
1495
 
                e.setAttribute("access", prop._dbus_access)
1496
 
                return e
1497
 
 
1498
 
            for if_tag in document.getElementsByTagName("interface"):
1499
 
                # Add property tags
1500
 
                for tag in (make_tag(document, name, prop)
1501
 
                            for name, prop
1502
 
                            in self._get_all_dbus_things("property")
1503
 
                            if prop._dbus_interface
1504
 
                            == if_tag.getAttribute("name")):
1505
 
                    if_tag.appendChild(tag)
1506
 
                # Add annotation tags for properties
1507
 
                for tag in if_tag.getElementsByTagName("property"):
1508
 
                    annots = dict()
1509
 
                    for name, prop in self._get_all_dbus_things(
1510
 
                            "property"):
1511
 
                        if (name == tag.getAttribute("name")
1512
 
                            and prop._dbus_interface
1513
 
                            == if_tag.getAttribute("name")):
1514
 
                            annots.update(getattr(
1515
 
                                prop, "_dbus_annotations", {}))
1516
 
                    for name, value in annots.items():
1517
 
                        ann_tag = document.createElement(
1518
 
                            "annotation")
1519
 
                        ann_tag.setAttribute("name", name)
1520
 
                        ann_tag.setAttribute("value", value)
1521
 
                        tag.appendChild(ann_tag)
1522
 
                # Add the names to the return values for the
1523
 
                # "org.freedesktop.DBus.Properties" methods
1524
 
                if (if_tag.getAttribute("name")
1525
 
                    == "org.freedesktop.DBus.Properties"):
1526
 
                    for cn in if_tag.getElementsByTagName("method"):
1527
 
                        if cn.getAttribute("name") == "Get":
1528
 
                            for arg in cn.getElementsByTagName("arg"):
1529
 
                                if (arg.getAttribute("direction")
1530
 
                                    == "out"):
1531
 
                                    arg.setAttribute("name", "value")
1532
 
                        elif cn.getAttribute("name") == "GetAll":
1533
 
                            for arg in cn.getElementsByTagName("arg"):
1534
 
                                if (arg.getAttribute("direction")
1535
 
                                    == "out"):
1536
 
                                    arg.setAttribute("name", "props")
1537
 
            xmlstring = document.toxml("utf-8")
1538
 
            document.unlink()
1539
 
        except (AttributeError, xml.dom.DOMException,
1540
 
                xml.parsers.expat.ExpatError) as error:
1541
 
            logger.error("Failed to override Introspection method",
1542
 
                         exc_info=error)
1543
 
        return xmlstring
1544
 
 
1545
 
 
1546
 
try:
1547
 
    dbus.OBJECT_MANAGER_IFACE
1548
 
except AttributeError:
1549
 
    dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"
1550
 
 
1551
 
 
1552
 
class DBusObjectWithObjectManager(DBusObjectWithAnnotations):
1553
 
    """A D-Bus object with an ObjectManager.
1554
 
 
1555
 
    Classes inheriting from this exposes the standard
1556
 
    GetManagedObjects call and the InterfacesAdded and
1557
 
    InterfacesRemoved signals on the standard
1558
 
    "org.freedesktop.DBus.ObjectManager" interface.
1559
 
 
1560
 
    Note: No signals are sent automatically; they must be sent
1561
 
    manually.
1562
 
    """
1563
 
    @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
1564
 
                         out_signature="a{oa{sa{sv}}}")
1565
 
    def GetManagedObjects(self):
1566
 
        """This function must be overridden"""
1567
 
        raise NotImplementedError()
1568
 
 
1569
 
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,
1570
 
                         signature="oa{sa{sv}}")
1571
 
    def InterfacesAdded(self, object_path, interfaces_and_properties):
1572
 
        pass
1573
 
 
1574
 
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature="oas")
1575
 
    def InterfacesRemoved(self, object_path, interfaces):
1576
 
        pass
1577
 
 
1578
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1579
 
                         out_signature="s",
1580
 
                         path_keyword='object_path',
1581
 
                         connection_keyword='connection')
1582
 
    def Introspect(self, object_path, connection):
1583
 
        """Overloading of standard D-Bus method.
1584
 
 
1585
 
        Override return argument name of GetManagedObjects to be
1586
 
        "objpath_interfaces_and_properties"
1587
 
        """
1588
 
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
1589
 
                                                         object_path,
1590
 
                                                         connection)
1591
 
        try:
1592
 
            document = xml.dom.minidom.parseString(xmlstring)
1593
 
 
1594
 
            for if_tag in document.getElementsByTagName("interface"):
1595
 
                # Fix argument name for the GetManagedObjects method
1596
 
                if (if_tag.getAttribute("name")
1597
 
                    == dbus.OBJECT_MANAGER_IFACE):
1598
 
                    for cn in if_tag.getElementsByTagName("method"):
1599
 
                        if (cn.getAttribute("name")
1600
 
                            == "GetManagedObjects"):
1601
 
                            for arg in cn.getElementsByTagName("arg"):
1602
 
                                if (arg.getAttribute("direction")
1603
 
                                    == "out"):
1604
 
                                    arg.setAttribute(
1605
 
                                        "name",
1606
 
                                        "objpath_interfaces"
1607
 
                                        "_and_properties")
1608
 
            xmlstring = document.toxml("utf-8")
1609
 
            document.unlink()
1610
 
        except (AttributeError, xml.dom.DOMException,
1611
 
                xml.parsers.expat.ExpatError) as error:
1612
 
            logger.error("Failed to override Introspection method",
1613
 
                         exc_info=error)
1614
 
        return xmlstring
1615
 
 
1616
 
 
1617
 
def datetime_to_dbus(dt, variant_level=0):
1618
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
1619
 
    if dt is None:
1620
 
        return dbus.String("", variant_level=variant_level)
1621
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
1622
 
 
1623
 
 
1624
 
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
1625
 
    """A class decorator; applied to a subclass of
1626
 
    dbus.service.Object, it will add alternate D-Bus attributes with
1627
 
    interface names according to the "alt_interface_names" mapping.
1628
 
    Usage:
1629
 
 
1630
 
    @alternate_dbus_interfaces({"org.example.Interface":
1631
 
                                    "net.example.AlternateInterface"})
1632
 
    class SampleDBusObject(dbus.service.Object):
1633
 
        @dbus.service.method("org.example.Interface")
1634
 
        def SampleDBusMethod():
1635
 
            pass
1636
 
 
1637
 
    The above "SampleDBusMethod" on "SampleDBusObject" will be
1638
 
    reachable via two interfaces: "org.example.Interface" and
1639
 
    "net.example.AlternateInterface", the latter of which will have
1640
 
    its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
1641
 
    "true", unless "deprecate" is passed with a False value.
1642
 
 
1643
 
    This works for methods and signals, and also for D-Bus properties
1644
 
    (from DBusObjectWithProperties) and interfaces (from the
1645
 
    dbus_interface_annotations decorator).
1646
 
    """
1647
 
 
1648
 
    def wrapper(cls):
1649
 
        for orig_interface_name, alt_interface_name in (
1650
 
                alt_interface_names.items()):
1651
 
            attr = {}
1652
 
            interface_names = set()
1653
 
            # Go though all attributes of the class
1654
 
            for attrname, attribute in inspect.getmembers(cls):
1655
 
                # Ignore non-D-Bus attributes, and D-Bus attributes
1656
 
                # with the wrong interface name
1657
 
                if (not hasattr(attribute, "_dbus_interface")
1658
 
                    or not attribute._dbus_interface.startswith(
1659
 
                        orig_interface_name)):
1660
 
                    continue
1661
 
                # Create an alternate D-Bus interface name based on
1662
 
                # the current name
1663
 
                alt_interface = attribute._dbus_interface.replace(
1664
 
                    orig_interface_name, alt_interface_name)
1665
 
                interface_names.add(alt_interface)
1666
 
                # Is this a D-Bus signal?
1667
 
                if getattr(attribute, "_dbus_is_signal", False):
1668
 
                    # Extract the original non-method undecorated
1669
 
                    # function by black magic
1670
 
                    if sys.version_info.major == 2:
1671
 
                        nonmethod_func = (dict(
1672
 
                            zip(attribute.func_code.co_freevars,
1673
 
                                attribute.__closure__))
1674
 
                                          ["func"].cell_contents)
1675
 
                    else:
1676
 
                        nonmethod_func = (dict(
1677
 
                            zip(attribute.__code__.co_freevars,
1678
 
                                attribute.__closure__))
1679
 
                                          ["func"].cell_contents)
1680
 
                    # Create a new, but exactly alike, function
1681
 
                    # object, and decorate it to be a new D-Bus signal
1682
 
                    # with the alternate D-Bus interface name
1683
 
                    new_function = copy_function(nonmethod_func)
1684
 
                    new_function = (dbus.service.signal(
1685
 
                        alt_interface,
1686
 
                        attribute._dbus_signature)(new_function))
1687
 
                    # Copy annotations, if any
1688
 
                    try:
1689
 
                        new_function._dbus_annotations = dict(
1690
 
                            attribute._dbus_annotations)
1691
 
                    except AttributeError:
1692
 
                        pass
1693
 
 
1694
 
                    # Define a creator of a function to call both the
1695
 
                    # original and alternate functions, so both the
1696
 
                    # original and alternate signals gets sent when
1697
 
                    # the function is called
1698
 
                    def fixscope(func1, func2):
1699
 
                        """This function is a scope container to pass
1700
 
                        func1 and func2 to the "call_both" function
1701
 
                        outside of its arguments"""
1702
 
 
1703
 
                        @functools.wraps(func2)
1704
 
                        def call_both(*args, **kwargs):
1705
 
                            """This function will emit two D-Bus
1706
 
                            signals by calling func1 and func2"""
1707
 
                            func1(*args, **kwargs)
1708
 
                            func2(*args, **kwargs)
1709
 
                        # Make wrapper function look like a D-Bus
1710
 
                        # signal
1711
 
                        for name, attr in inspect.getmembers(func2):
1712
 
                            if name.startswith("_dbus_"):
1713
 
                                setattr(call_both, name, attr)
1714
 
 
1715
 
                        return call_both
1716
 
                    # Create the "call_both" function and add it to
1717
 
                    # the class
1718
 
                    attr[attrname] = fixscope(attribute, new_function)
1719
 
                # Is this a D-Bus method?
1720
 
                elif getattr(attribute, "_dbus_is_method", False):
1721
 
                    # Create a new, but exactly alike, function
1722
 
                    # object.  Decorate it to be a new D-Bus method
1723
 
                    # with the alternate D-Bus interface name.  Add it
1724
 
                    # to the class.
1725
 
                    attr[attrname] = (
1726
 
                        dbus.service.method(
1727
 
                            alt_interface,
1728
 
                            attribute._dbus_in_signature,
1729
 
                            attribute._dbus_out_signature)
1730
 
                        (copy_function(attribute)))
1731
 
                    # Copy annotations, if any
1732
 
                    try:
1733
 
                        attr[attrname]._dbus_annotations = dict(
1734
 
                            attribute._dbus_annotations)
1735
 
                    except AttributeError:
1736
 
                        pass
1737
 
                # Is this a D-Bus property?
1738
 
                elif getattr(attribute, "_dbus_is_property", False):
1739
 
                    # Create a new, but exactly alike, function
1740
 
                    # object, and decorate it to be a new D-Bus
1741
 
                    # property with the alternate D-Bus interface
1742
 
                    # name.  Add it to the class.
1743
 
                    attr[attrname] = (dbus_service_property(
1744
 
                        alt_interface, attribute._dbus_signature,
1745
 
                        attribute._dbus_access,
1746
 
                        attribute._dbus_get_args_options
1747
 
                        ["byte_arrays"])
1748
 
                                      (copy_function(attribute)))
1749
 
                    # Copy annotations, if any
1750
 
                    try:
1751
 
                        attr[attrname]._dbus_annotations = dict(
1752
 
                            attribute._dbus_annotations)
1753
 
                    except AttributeError:
1754
 
                        pass
1755
 
                # Is this a D-Bus interface?
1756
 
                elif getattr(attribute, "_dbus_is_interface", False):
1757
 
                    # Create a new, but exactly alike, function
1758
 
                    # object.  Decorate it to be a new D-Bus interface
1759
 
                    # with the alternate D-Bus interface name.  Add it
1760
 
                    # to the class.
1761
 
                    attr[attrname] = (
1762
 
                        dbus_interface_annotations(alt_interface)
1763
 
                        (copy_function(attribute)))
1764
 
            if deprecate:
1765
 
                # Deprecate all alternate interfaces
1766
 
                iname = "_AlternateDBusNames_interface_annotation{}"
1767
 
                for interface_name in interface_names:
1768
 
 
1769
 
                    @dbus_interface_annotations(interface_name)
1770
 
                    def func(self):
1771
 
                        return {"org.freedesktop.DBus.Deprecated":
1772
 
                                "true"}
1773
 
                    # Find an unused name
1774
 
                    for aname in (iname.format(i)
1775
 
                                  for i in itertools.count()):
1776
 
                        if aname not in attr:
1777
 
                            attr[aname] = func
1778
 
                            break
1779
 
            if interface_names:
1780
 
                # Replace the class with a new subclass of it with
1781
 
                # methods, signals, etc. as created above.
1782
 
                if sys.version_info.major == 2:
1783
 
                    cls = type(b"{}Alternate".format(cls.__name__),
1784
 
                               (cls, ), attr)
1785
 
                else:
1786
 
                    cls = type("{}Alternate".format(cls.__name__),
1787
 
                               (cls, ), attr)
1788
 
        return cls
1789
 
 
1790
 
    return wrapper
1791
 
 
1792
 
 
1793
 
@alternate_dbus_interfaces({"se.recompile.Mandos":
1794
 
                            "se.bsnet.fukt.Mandos"})
1795
 
class ClientDBus(Client, DBusObjectWithProperties):
1796
 
    """A Client class using D-Bus
1797
 
 
1798
 
    Attributes:
1799
 
    dbus_object_path: dbus.ObjectPath
1800
 
    bus: dbus.SystemBus()
1801
 
    """
1802
 
 
1803
 
    runtime_expansions = (Client.runtime_expansions
1804
 
                          + ("dbus_object_path", ))
1805
 
 
1806
 
    _interface = "se.recompile.Mandos.Client"
1807
 
 
1808
 
    # dbus.service.Object doesn't use super(), so we can't either.
1809
 
 
1810
 
    def __init__(self, bus=None, *args, **kwargs):
1811
 
        self.bus = bus
1812
 
        Client.__init__(self, *args, **kwargs)
1813
 
        # Only now, when this client is initialized, can it show up on
1814
 
        # the D-Bus
1815
 
        client_object_name = str(self.name).translate(
1816
 
            {ord("."): ord("_"),
1817
 
             ord("-"): ord("_")})
1818
 
        self.dbus_object_path = dbus.ObjectPath(
1819
 
            "/clients/" + client_object_name)
1820
 
        DBusObjectWithProperties.__init__(self, self.bus,
1821
 
                                          self.dbus_object_path)
1822
 
 
1823
 
    def notifychangeproperty(transform_func, dbus_name,
1824
 
                             type_func=lambda x: x,
1825
 
                             variant_level=1,
1826
 
                             invalidate_only=False,
1827
 
                             _interface=_interface):
1828
 
        """ Modify a variable so that it's a property which announces
1829
 
        its changes to DBus.
1830
 
 
1831
 
        transform_fun: Function that takes a value and a variant_level
1832
 
                       and transforms it to a D-Bus type.
1833
 
        dbus_name: D-Bus name of the variable
1834
 
        type_func: Function that transform the value before sending it
1835
 
                   to the D-Bus.  Default: no transform
1836
 
        variant_level: D-Bus variant level.  Default: 1
1837
 
        """
1838
 
        attrname = "_{}".format(dbus_name)
1839
 
 
1840
 
        def setter(self, value):
1841
 
            if hasattr(self, "dbus_object_path"):
1842
 
                if (not hasattr(self, attrname) or
1843
 
                    type_func(getattr(self, attrname, None))
1844
 
                    != type_func(value)):
1845
 
                    if invalidate_only:
1846
 
                        self.PropertiesChanged(
1847
 
                            _interface, dbus.Dictionary(),
1848
 
                            dbus.Array((dbus_name, )))
1849
 
                    else:
1850
 
                        dbus_value = transform_func(
1851
 
                            type_func(value),
1852
 
                            variant_level=variant_level)
1853
 
                        self.PropertyChanged(dbus.String(dbus_name),
1854
 
                                             dbus_value)
1855
 
                        self.PropertiesChanged(
1856
 
                            _interface,
1857
 
                            dbus.Dictionary({dbus.String(dbus_name):
1858
 
                                             dbus_value}),
1859
 
                            dbus.Array())
1860
 
            setattr(self, attrname, value)
1861
 
 
1862
 
        return property(lambda self: getattr(self, attrname), setter)
1863
 
 
1864
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
1865
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
1866
 
                                             "ApprovalPending",
1867
 
                                             type_func=bool)
1868
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1869
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
1870
 
                                        "LastEnabled")
1871
 
    checker = notifychangeproperty(
1872
 
        dbus.Boolean, "CheckerRunning",
1873
 
        type_func=lambda checker: checker is not None)
1874
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
1875
 
                                           "LastCheckedOK")
1876
 
    last_checker_status = notifychangeproperty(dbus.Int16,
1877
 
                                               "LastCheckerStatus")
1878
 
    last_approval_request = notifychangeproperty(
1879
 
        datetime_to_dbus, "LastApprovalRequest")
1880
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
1881
 
                                               "ApprovedByDefault")
1882
 
    approval_delay = notifychangeproperty(
1883
 
        dbus.UInt64, "ApprovalDelay",
1884
 
        type_func=lambda td: td.total_seconds() * 1000)
1885
 
    approval_duration = notifychangeproperty(
1886
 
        dbus.UInt64, "ApprovalDuration",
1887
 
        type_func=lambda td: td.total_seconds() * 1000)
1888
 
    host = notifychangeproperty(dbus.String, "Host")
1889
 
    timeout = notifychangeproperty(
1890
 
        dbus.UInt64, "Timeout",
1891
 
        type_func=lambda td: td.total_seconds() * 1000)
1892
 
    extended_timeout = notifychangeproperty(
1893
 
        dbus.UInt64, "ExtendedTimeout",
1894
 
        type_func=lambda td: td.total_seconds() * 1000)
1895
 
    interval = notifychangeproperty(
1896
 
        dbus.UInt64, "Interval",
1897
 
        type_func=lambda td: td.total_seconds() * 1000)
1898
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
1899
 
    secret = notifychangeproperty(dbus.ByteArray, "Secret",
1900
 
                                  invalidate_only=True)
1901
 
 
1902
 
    del notifychangeproperty
1903
 
 
1904
 
    def __del__(self, *args, **kwargs):
1905
 
        try:
1906
 
            self.remove_from_connection()
1907
 
        except LookupError:
1908
 
            pass
1909
 
        if hasattr(DBusObjectWithProperties, "__del__"):
1910
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
1911
 
        Client.__del__(self, *args, **kwargs)
1912
 
 
1913
 
    def checker_callback(self, source, condition,
1914
 
                         connection, command, *args, **kwargs):
1915
 
        ret = Client.checker_callback(self, source, condition,
1916
 
                                      connection, command, *args,
1917
 
                                      **kwargs)
1918
 
        exitstatus = self.last_checker_status
1919
 
        if exitstatus >= 0:
1920
 
            # Emit D-Bus signal
1921
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
1922
 
                                  # This is specific to GNU libC
1923
 
                                  dbus.Int64(exitstatus << 8),
1924
 
                                  dbus.String(command))
1925
 
        else:
1926
 
            # Emit D-Bus signal
1927
 
            self.CheckerCompleted(dbus.Int16(-1),
1928
 
                                  dbus.Int64(
1929
 
                                      # This is specific to GNU libC
1930
 
                                      (exitstatus << 8)
1931
 
                                      | self.last_checker_signal),
1932
 
                                  dbus.String(command))
1933
 
        return ret
1934
 
 
1935
 
    def start_checker(self, *args, **kwargs):
1936
 
        old_checker_pid = getattr(self.checker, "pid", None)
1937
 
        r = Client.start_checker(self, *args, **kwargs)
1938
 
        # Only if new checker process was started
1939
 
        if (self.checker is not None
1940
 
            and old_checker_pid != self.checker.pid):
1941
 
            # Emit D-Bus signal
1942
 
            self.CheckerStarted(self.current_checker_command)
1943
 
        return r
1944
 
 
1945
 
    def _reset_approved(self):
1946
 
        self.approved = None
1947
 
        return False
1948
 
 
1949
 
    def approve(self, value=True):
1950
 
        self.approved = value
1951
 
        GLib.timeout_add(int(self.approval_duration.total_seconds()
1952
 
                             * 1000), self._reset_approved)
1953
 
        self.send_changedstate()
1954
 
 
1955
 
    #  D-Bus methods, signals & properties
1956
 
 
1957
 
    #  Interfaces
1958
 
 
1959
 
    #  Signals
1960
 
 
1961
 
    # CheckerCompleted - signal
1962
 
    @dbus.service.signal(_interface, signature="nxs")
1963
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
1964
 
        "D-Bus signal"
1965
 
        pass
1966
 
 
1967
 
    # CheckerStarted - signal
1968
 
    @dbus.service.signal(_interface, signature="s")
1969
 
    def CheckerStarted(self, command):
1970
 
        "D-Bus signal"
1971
 
        pass
1972
 
 
1973
 
    # PropertyChanged - signal
1974
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1975
 
    @dbus.service.signal(_interface, signature="sv")
1976
 
    def PropertyChanged(self, property, value):
1977
 
        "D-Bus signal"
1978
 
        pass
1979
 
 
1980
 
    # GotSecret - signal
1981
 
    @dbus.service.signal(_interface)
1982
 
    def GotSecret(self):
1983
 
        """D-Bus signal
1984
 
        Is sent after a successful transfer of secret from the Mandos
1985
 
        server to mandos-client
1986
 
        """
1987
 
        pass
1988
 
 
1989
 
    # Rejected - signal
1990
 
    @dbus.service.signal(_interface, signature="s")
1991
 
    def Rejected(self, reason):
1992
 
        "D-Bus signal"
1993
 
        pass
1994
 
 
1995
 
    # NeedApproval - signal
1996
 
    @dbus.service.signal(_interface, signature="tb")
1997
 
    def NeedApproval(self, timeout, default):
1998
 
        "D-Bus signal"
1999
 
        return self.need_approval()
2000
 
 
2001
 
    #  Methods
2002
 
 
2003
 
    # Approve - method
2004
 
    @dbus.service.method(_interface, in_signature="b")
2005
 
    def Approve(self, value):
2006
 
        self.approve(value)
2007
 
 
2008
 
    # CheckedOK - method
2009
 
    @dbus.service.method(_interface)
2010
 
    def CheckedOK(self):
2011
 
        self.checked_ok()
2012
 
 
2013
 
    # Enable - method
2014
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
2015
 
    @dbus.service.method(_interface)
2016
 
    def Enable(self):
2017
 
        "D-Bus method"
2018
 
        self.enable()
2019
 
 
2020
 
    # StartChecker - method
2021
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
2022
 
    @dbus.service.method(_interface)
2023
 
    def StartChecker(self):
2024
 
        "D-Bus method"
2025
 
        self.start_checker()
2026
 
 
2027
 
    # Disable - method
2028
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
2029
 
    @dbus.service.method(_interface)
2030
 
    def Disable(self):
2031
 
        "D-Bus method"
2032
 
        self.disable()
2033
 
 
2034
 
    # StopChecker - method
2035
 
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
2036
 
    @dbus.service.method(_interface)
2037
 
    def StopChecker(self):
2038
 
        self.stop_checker()
2039
 
 
2040
 
    #  Properties
2041
 
 
2042
 
    # ApprovalPending - property
2043
 
    @dbus_service_property(_interface, signature="b", access="read")
2044
 
    def ApprovalPending_dbus_property(self):
2045
 
        return dbus.Boolean(bool(self.approvals_pending))
2046
 
 
2047
 
    # ApprovedByDefault - property
2048
 
    @dbus_service_property(_interface,
2049
 
                           signature="b",
2050
 
                           access="readwrite")
2051
 
    def ApprovedByDefault_dbus_property(self, value=None):
2052
 
        if value is None:       # get
2053
 
            return dbus.Boolean(self.approved_by_default)
2054
 
        self.approved_by_default = bool(value)
2055
 
 
2056
 
    # ApprovalDelay - property
2057
 
    @dbus_service_property(_interface,
2058
 
                           signature="t",
2059
 
                           access="readwrite")
2060
 
    def ApprovalDelay_dbus_property(self, value=None):
2061
 
        if value is None:       # get
2062
 
            return dbus.UInt64(self.approval_delay.total_seconds()
2063
 
                               * 1000)
2064
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
2065
 
 
2066
 
    # ApprovalDuration - property
2067
 
    @dbus_service_property(_interface,
2068
 
                           signature="t",
2069
 
                           access="readwrite")
2070
 
    def ApprovalDuration_dbus_property(self, value=None):
2071
 
        if value is None:       # get
2072
 
            return dbus.UInt64(self.approval_duration.total_seconds()
2073
 
                               * 1000)
2074
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
2075
 
 
2076
 
    # Name - property
2077
 
    @dbus_annotations(
2078
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2079
 
    @dbus_service_property(_interface, signature="s", access="read")
2080
 
    def Name_dbus_property(self):
2081
 
        return dbus.String(self.name)
2082
 
 
2083
 
    # KeyID - property
2084
 
    @dbus_annotations(
2085
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2086
 
    @dbus_service_property(_interface, signature="s", access="read")
2087
 
    def KeyID_dbus_property(self):
2088
 
        return dbus.String(self.key_id)
2089
 
 
2090
 
    # Fingerprint - property
2091
 
    @dbus_annotations(
2092
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2093
 
    @dbus_service_property(_interface, signature="s", access="read")
2094
 
    def Fingerprint_dbus_property(self):
2095
 
        return dbus.String(self.fingerprint)
2096
 
 
2097
 
    # Host - property
2098
 
    @dbus_service_property(_interface,
2099
 
                           signature="s",
2100
 
                           access="readwrite")
2101
 
    def Host_dbus_property(self, value=None):
2102
 
        if value is None:       # get
2103
 
            return dbus.String(self.host)
2104
 
        self.host = str(value)
2105
 
 
2106
 
    # Created - property
2107
 
    @dbus_annotations(
2108
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2109
 
    @dbus_service_property(_interface, signature="s", access="read")
2110
 
    def Created_dbus_property(self):
2111
 
        return datetime_to_dbus(self.created)
2112
 
 
2113
 
    # LastEnabled - property
2114
 
    @dbus_service_property(_interface, signature="s", access="read")
2115
 
    def LastEnabled_dbus_property(self):
2116
 
        return datetime_to_dbus(self.last_enabled)
2117
 
 
2118
 
    # Enabled - property
2119
 
    @dbus_service_property(_interface,
2120
 
                           signature="b",
2121
 
                           access="readwrite")
2122
 
    def Enabled_dbus_property(self, value=None):
2123
 
        if value is None:       # get
2124
 
            return dbus.Boolean(self.enabled)
2125
 
        if value:
2126
 
            self.enable()
2127
 
        else:
2128
 
            self.disable()
2129
 
 
2130
 
    # LastCheckedOK - property
2131
 
    @dbus_service_property(_interface,
2132
 
                           signature="s",
2133
 
                           access="readwrite")
2134
 
    def LastCheckedOK_dbus_property(self, value=None):
2135
 
        if value is not None:
2136
 
            self.checked_ok()
2137
 
            return
2138
 
        return datetime_to_dbus(self.last_checked_ok)
2139
 
 
2140
 
    # LastCheckerStatus - property
2141
 
    @dbus_service_property(_interface, signature="n", access="read")
2142
 
    def LastCheckerStatus_dbus_property(self):
2143
 
        return dbus.Int16(self.last_checker_status)
2144
 
 
2145
 
    # Expires - property
2146
 
    @dbus_service_property(_interface, signature="s", access="read")
2147
 
    def Expires_dbus_property(self):
2148
 
        return datetime_to_dbus(self.expires)
2149
 
 
2150
 
    # LastApprovalRequest - property
2151
 
    @dbus_service_property(_interface, signature="s", access="read")
2152
 
    def LastApprovalRequest_dbus_property(self):
2153
 
        return datetime_to_dbus(self.last_approval_request)
2154
 
 
2155
 
    # Timeout - property
2156
 
    @dbus_service_property(_interface,
2157
 
                           signature="t",
2158
 
                           access="readwrite")
2159
 
    def Timeout_dbus_property(self, value=None):
2160
 
        if value is None:       # get
2161
 
            return dbus.UInt64(self.timeout.total_seconds() * 1000)
2162
 
        old_timeout = self.timeout
2163
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
2164
 
        # Reschedule disabling
2165
 
        if self.enabled:
2166
 
            now = datetime.datetime.utcnow()
2167
 
            self.expires += self.timeout - old_timeout
2168
 
            if self.expires <= now:
2169
 
                # The timeout has passed
2170
 
                self.disable()
2171
 
            else:
2172
 
                if (getattr(self, "disable_initiator_tag", None)
2173
 
                    is None):
2174
 
                    return
2175
 
                GLib.source_remove(self.disable_initiator_tag)
2176
 
                self.disable_initiator_tag = GLib.timeout_add(
2177
 
                    int((self.expires - now).total_seconds() * 1000),
2178
 
                    self.disable)
2179
 
 
2180
 
    # ExtendedTimeout - property
2181
 
    @dbus_service_property(_interface,
2182
 
                           signature="t",
2183
 
                           access="readwrite")
2184
 
    def ExtendedTimeout_dbus_property(self, value=None):
2185
 
        if value is None:       # get
2186
 
            return dbus.UInt64(self.extended_timeout.total_seconds()
2187
 
                               * 1000)
2188
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
2189
 
 
2190
 
    # Interval - property
2191
 
    @dbus_service_property(_interface,
2192
 
                           signature="t",
2193
 
                           access="readwrite")
2194
 
    def Interval_dbus_property(self, value=None):
2195
 
        if value is None:       # get
2196
 
            return dbus.UInt64(self.interval.total_seconds() * 1000)
2197
 
        self.interval = datetime.timedelta(0, 0, 0, value)
2198
 
        if getattr(self, "checker_initiator_tag", None) is None:
2199
 
            return
2200
 
        if self.enabled:
2201
 
            # Reschedule checker run
2202
 
            GLib.source_remove(self.checker_initiator_tag)
2203
 
            self.checker_initiator_tag = GLib.timeout_add(
2204
 
                value, self.start_checker)
2205
 
            self.start_checker()  # Start one now, too
2206
 
 
2207
 
    # Checker - property
2208
 
    @dbus_service_property(_interface,
2209
 
                           signature="s",
2210
 
                           access="readwrite")
2211
 
    def Checker_dbus_property(self, value=None):
2212
 
        if value is None:       # get
2213
 
            return dbus.String(self.checker_command)
2214
 
        self.checker_command = str(value)
2215
 
 
2216
 
    # CheckerRunning - property
2217
 
    @dbus_service_property(_interface,
2218
 
                           signature="b",
2219
 
                           access="readwrite")
2220
 
    def CheckerRunning_dbus_property(self, value=None):
2221
 
        if value is None:       # get
2222
 
            return dbus.Boolean(self.checker is not None)
2223
 
        if value:
2224
 
            self.start_checker()
2225
 
        else:
2226
 
            self.stop_checker()
2227
 
 
2228
 
    # ObjectPath - property
2229
 
    @dbus_annotations(
2230
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",
2231
 
         "org.freedesktop.DBus.Deprecated": "true"})
2232
 
    @dbus_service_property(_interface, signature="o", access="read")
2233
 
    def ObjectPath_dbus_property(self):
2234
 
        return self.dbus_object_path  # is already a dbus.ObjectPath
2235
 
 
2236
 
    # Secret = property
2237
 
    @dbus_annotations(
2238
 
        {"org.freedesktop.DBus.Property.EmitsChangedSignal":
2239
 
         "invalidates"})
2240
 
    @dbus_service_property(_interface,
2241
 
                           signature="ay",
2242
 
                           access="write",
2243
 
                           byte_arrays=True)
2244
 
    def Secret_dbus_property(self, value):
2245
 
        self.secret = bytes(value)
2246
 
 
2247
 
    del _interface
2248
 
 
2249
 
 
2250
 
class ProxyClient:
2251
 
    def __init__(self, child_pipe, key_id, fpr, address):
2252
 
        self._pipe = child_pipe
2253
 
        self._pipe.send(('init', key_id, fpr, address))
2254
 
        if not self._pipe.recv():
2255
 
            raise KeyError(key_id or fpr)
2256
 
 
2257
 
    def __getattribute__(self, name):
2258
 
        if name == '_pipe':
2259
 
            return super(ProxyClient, self).__getattribute__(name)
2260
 
        self._pipe.send(('getattr', name))
2261
 
        data = self._pipe.recv()
2262
 
        if data[0] == 'data':
2263
 
            return data[1]
2264
 
        if data[0] == 'function':
2265
 
 
2266
 
            def func(*args, **kwargs):
2267
 
                self._pipe.send(('funcall', name, args, kwargs))
2268
 
                return self._pipe.recv()[1]
2269
 
 
2270
 
            return func
2271
 
 
2272
 
    def __setattr__(self, name, value):
2273
 
        if name == '_pipe':
2274
 
            return super(ProxyClient, self).__setattr__(name, value)
2275
 
        self._pipe.send(('setattr', name, value))
2276
 
 
2277
 
 
2278
 
class ClientHandler(socketserver.BaseRequestHandler, object):
2279
 
    """A class to handle client connections.
2280
 
 
2281
 
    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.
2282
431
    Note: This will run in its own forked process."""
2283
 
 
 
432
    
2284
433
    def handle(self):
2285
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
2286
 
            logger.info("TCP connection from: %s",
2287
 
                        str(self.client_address))
2288
 
            logger.debug("Pipe FD: %d",
2289
 
                         self.server.child_pipe.fileno())
2290
 
 
2291
 
            session = gnutls.ClientSession(self.request)
2292
 
 
2293
 
            # priority = ':'.join(("NONE", "+VERS-TLS1.1",
2294
 
            #                       "+AES-256-CBC", "+SHA1",
2295
 
            #                       "+COMP-NULL", "+CTYPE-OPENPGP",
2296
 
            #                       "+DHE-DSS"))
2297
 
            # Use a fallback default, since this MUST be set.
2298
 
            priority = self.server.gnutls_priority
2299
 
            if priority is None:
2300
 
                priority = "NORMAL"
2301
 
            gnutls.priority_set_direct(session._c_object,
2302
 
                                       priority.encode("utf-8"),
2303
 
                                       None)
2304
 
 
2305
 
            # Start communication using the Mandos protocol
2306
 
            # Get protocol number
2307
 
            line = self.request.makefile().readline()
2308
 
            logger.debug("Protocol version: %r", line)
2309
 
            try:
2310
 
                if int(line.strip().split()[0]) > 1:
2311
 
                    raise RuntimeError(line)
2312
 
            except (ValueError, IndexError, RuntimeError) as error:
2313
 
                logger.error("Unknown protocol version: %s", error)
2314
 
                return
2315
 
 
2316
 
            # Start GnuTLS connection
2317
 
            try:
2318
 
                session.handshake()
2319
 
            except gnutls.Error as error:
2320
 
                logger.warning("Handshake failed: %s", error)
2321
 
                # Do not run session.bye() here: the session is not
2322
 
                # established.  Just abandon the request.
2323
 
                return
2324
 
            logger.debug("Handshake succeeded")
2325
 
 
2326
 
            approval_required = False
2327
 
            try:
2328
 
                if gnutls.has_rawpk:
2329
 
                    fpr = b""
2330
 
                    try:
2331
 
                        key_id = self.key_id(
2332
 
                            self.peer_certificate(session))
2333
 
                    except (TypeError, gnutls.Error) as error:
2334
 
                        logger.warning("Bad certificate: %s", error)
2335
 
                        return
2336
 
                    logger.debug("Key ID: %s", key_id)
2337
 
 
2338
 
                else:
2339
 
                    key_id = b""
2340
 
                    try:
2341
 
                        fpr = self.fingerprint(
2342
 
                            self.peer_certificate(session))
2343
 
                    except (TypeError, gnutls.Error) as error:
2344
 
                        logger.warning("Bad certificate: %s", error)
2345
 
                        return
2346
 
                    logger.debug("Fingerprint: %s", fpr)
2347
 
 
2348
 
                try:
2349
 
                    client = ProxyClient(child_pipe, key_id, fpr,
2350
 
                                         self.client_address)
2351
 
                except KeyError:
2352
 
                    return
2353
 
 
2354
 
                if client.approval_delay:
2355
 
                    delay = client.approval_delay
2356
 
                    client.approvals_pending += 1
2357
 
                    approval_required = True
2358
 
 
2359
 
                while True:
2360
 
                    if not client.enabled:
2361
 
                        logger.info("Client %s is disabled",
2362
 
                                    client.name)
2363
 
                        if self.server.use_dbus:
2364
 
                            # Emit D-Bus signal
2365
 
                            client.Rejected("Disabled")
2366
 
                        return
2367
 
 
2368
 
                    if client.approved or not client.approval_delay:
2369
 
                        # We are approved or approval is disabled
2370
 
                        break
2371
 
                    elif client.approved is None:
2372
 
                        logger.info("Client %s needs approval",
2373
 
                                    client.name)
2374
 
                        if self.server.use_dbus:
2375
 
                            # Emit D-Bus signal
2376
 
                            client.NeedApproval(
2377
 
                                client.approval_delay.total_seconds()
2378
 
                                * 1000, client.approved_by_default)
2379
 
                    else:
2380
 
                        logger.warning("Client %s was not approved",
2381
 
                                       client.name)
2382
 
                        if self.server.use_dbus:
2383
 
                            # Emit D-Bus signal
2384
 
                            client.Rejected("Denied")
2385
 
                        return
2386
 
 
2387
 
                    # wait until timeout or approved
2388
 
                    time = datetime.datetime.now()
2389
 
                    client.changedstate.acquire()
2390
 
                    client.changedstate.wait(delay.total_seconds())
2391
 
                    client.changedstate.release()
2392
 
                    time2 = datetime.datetime.now()
2393
 
                    if (time2 - time) >= delay:
2394
 
                        if not client.approved_by_default:
2395
 
                            logger.warning("Client %s timed out while"
2396
 
                                           " waiting for approval",
2397
 
                                           client.name)
2398
 
                            if self.server.use_dbus:
2399
 
                                # Emit D-Bus signal
2400
 
                                client.Rejected("Approval timed out")
2401
 
                            return
2402
 
                        else:
2403
 
                            break
2404
 
                    else:
2405
 
                        delay -= time2 - time
2406
 
 
2407
 
                try:
2408
 
                    session.send(client.secret)
2409
 
                except gnutls.Error as error:
2410
 
                    logger.warning("gnutls send failed",
2411
 
                                   exc_info=error)
2412
 
                    return
2413
 
 
2414
 
                logger.info("Sending secret to %s", client.name)
2415
 
                # bump the timeout using extended_timeout
2416
 
                client.bump_timeout(client.extended_timeout)
2417
 
                if self.server.use_dbus:
2418
 
                    # Emit D-Bus signal
2419
 
                    client.GotSecret()
2420
 
 
2421
 
            finally:
2422
 
                if approval_required:
2423
 
                    client.approvals_pending -= 1
2424
 
                try:
2425
 
                    session.bye()
2426
 
                except gnutls.Error as error:
2427
 
                    logger.warning("GnuTLS bye failed",
2428
 
                                   exc_info=error)
2429
 
 
2430
 
    @staticmethod
2431
 
    def peer_certificate(session):
2432
 
        "Return the peer's certificate as a bytestring"
2433
 
        try:
2434
 
            cert_type = gnutls.certificate_type_get2(session._c_object,
2435
 
                                                     gnutls.CTYPE_PEERS)
2436
 
        except AttributeError:
2437
 
            cert_type = gnutls.certificate_type_get(session._c_object)
2438
 
        if gnutls.has_rawpk:
2439
 
            valid_cert_types = frozenset((gnutls.CRT_RAWPK,))
2440
 
        else:
2441
 
            valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))
2442
 
        # If not a valid certificate type...
2443
 
        if cert_type not in valid_cert_types:
2444
 
            logger.info("Cert type %r not in %r", cert_type,
2445
 
                        valid_cert_types)
2446
 
            # ...return invalid data
2447
 
            return b""
2448
 
        list_size = ctypes.c_uint(1)
2449
 
        cert_list = (gnutls.certificate_get_peers
2450
 
                     (session._c_object, ctypes.byref(list_size)))
2451
 
        if not bool(cert_list) and list_size.value != 0:
2452
 
            raise gnutls.Error("error getting peer certificate")
2453
 
        if list_size.value == 0:
2454
 
            return None
2455
 
        cert = cert_list[0]
2456
 
        return ctypes.string_at(cert.data, cert.size)
2457
 
 
2458
 
    @staticmethod
2459
 
    def key_id(certificate):
2460
 
        "Convert a certificate bytestring to a hexdigit key ID"
2461
 
        # New GnuTLS "datum" with the public key
2462
 
        datum = gnutls.datum_t(
2463
 
            ctypes.cast(ctypes.c_char_p(certificate),
2464
 
                        ctypes.POINTER(ctypes.c_ubyte)),
2465
 
            ctypes.c_uint(len(certificate)))
2466
 
        # XXX all these need to be created in the gnutls "module"
2467
 
        # New empty GnuTLS certificate
2468
 
        pubkey = gnutls.pubkey_t()
2469
 
        gnutls.pubkey_init(ctypes.byref(pubkey))
2470
 
        # Import the raw public key into the certificate
2471
 
        gnutls.pubkey_import(pubkey,
2472
 
                             ctypes.byref(datum),
2473
 
                             gnutls.X509_FMT_DER)
2474
 
        # New buffer for the key ID
2475
 
        buf = ctypes.create_string_buffer(32)
2476
 
        buf_len = ctypes.c_size_t(len(buf))
2477
 
        # Get the key ID from the raw public key into the buffer
2478
 
        gnutls.pubkey_get_key_id(
2479
 
            pubkey,
2480
 
            gnutls.KEYID_USE_SHA256,
2481
 
            ctypes.cast(ctypes.byref(buf),
2482
 
                        ctypes.POINTER(ctypes.c_ubyte)),
2483
 
            ctypes.byref(buf_len))
2484
 
        # Deinit the certificate
2485
 
        gnutls.pubkey_deinit(pubkey)
2486
 
 
2487
 
        # Convert the buffer to a Python bytestring
2488
 
        key_id = ctypes.string_at(buf, buf_len.value)
2489
 
        # Convert the bytestring to hexadecimal notation
2490
 
        hex_key_id = binascii.hexlify(key_id).upper()
2491
 
        return hex_key_id
2492
 
 
2493
 
    @staticmethod
2494
 
    def fingerprint(openpgp):
2495
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
2496
 
        # New GnuTLS "datum" with the OpenPGP public key
2497
 
        datum = gnutls.datum_t(
2498
 
            ctypes.cast(ctypes.c_char_p(openpgp),
2499
 
                        ctypes.POINTER(ctypes.c_ubyte)),
2500
 
            ctypes.c_uint(len(openpgp)))
2501
 
        # New empty GnuTLS certificate
2502
 
        crt = gnutls.openpgp_crt_t()
2503
 
        gnutls.openpgp_crt_init(ctypes.byref(crt))
2504
 
        # Import the OpenPGP public key into the certificate
2505
 
        gnutls.openpgp_crt_import(crt, ctypes.byref(datum),
2506
 
                                  gnutls.OPENPGP_FMT_RAW)
2507
 
        # Verify the self signature in the key
2508
 
        crtverify = ctypes.c_uint()
2509
 
        gnutls.openpgp_crt_verify_self(crt, 0,
2510
 
                                       ctypes.byref(crtverify))
2511
 
        if crtverify.value != 0:
2512
 
            gnutls.openpgp_crt_deinit(crt)
2513
 
            raise gnutls.CertificateSecurityError(code
2514
 
                                                  =crtverify.value)
2515
 
        # New buffer for the fingerprint
2516
 
        buf = ctypes.create_string_buffer(20)
2517
 
        buf_len = ctypes.c_size_t()
2518
 
        # Get the fingerprint from the certificate into the buffer
2519
 
        gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
2520
 
                                           ctypes.byref(buf_len))
2521
 
        # Deinit the certificate
2522
 
        gnutls.openpgp_crt_deinit(crt)
2523
 
        # Convert the buffer to a Python bytestring
2524
 
        fpr = ctypes.string_at(buf, buf_len.value)
2525
 
        # Convert the bytestring to hexadecimal notation
2526
 
        hex_fpr = binascii.hexlify(fpr).upper()
2527
 
        return hex_fpr
2528
 
 
2529
 
 
2530
 
class MultiprocessingMixIn:
2531
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
2532
 
 
2533
 
    def sub_process_main(self, request, address):
2534
 
        try:
2535
 
            self.finish_request(request, address)
2536
 
        except Exception:
2537
 
            self.handle_error(request, address)
2538
 
        self.close_request(request)
2539
 
 
2540
 
    def process_request(self, request, address):
2541
 
        """Start a new process to process the request."""
2542
 
        proc = multiprocessing.Process(target=self.sub_process_main,
2543
 
                                       args=(request, address))
2544
 
        proc.start()
2545
 
        return proc
2546
 
 
2547
 
 
2548
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn):
2549
 
    """ adds a pipe to the MixIn """
2550
 
 
2551
 
    def process_request(self, request, client_address):
2552
 
        """Overrides and wraps the original process_request().
2553
 
 
2554
 
        This function creates a new pipe in self.pipe
2555
 
        """
2556
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
2557
 
 
2558
 
        proc = MultiprocessingMixIn.process_request(self, request,
2559
 
                                                    client_address)
2560
 
        self.child_pipe.close()
2561
 
        self.add_pipe(parent_pipe, proc)
2562
 
 
2563
 
    def add_pipe(self, parent_pipe, proc):
2564
 
        """Dummy function; override as necessary"""
2565
 
        raise NotImplementedError()
2566
 
 
2567
 
 
2568
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
2569
 
                     socketserver.TCPServer):
2570
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
2571
 
 
 
434
        logger.debug(u"TCP connection from: %s",
 
435
                     unicode(self.client_address))
 
436
 
 
437
        line = self.request.makefile().readline()
 
438
        logger.debug(u"Protocol version: %r", line)
 
439
        try:
 
440
            if int(line.strip().split()[0]) > 1:
 
441
                raise RuntimeError
 
442
        except (ValueError, IndexError, RuntimeError), error:
 
443
            logger.error(u"Unknown protocol version: %s", error)
 
444
            return
 
445
        
 
446
        session = gnutls.connection.ClientSession\
 
447
                  (self.request, gnutls.connection.X509Credentials())
 
448
        # Note: gnutls.connection.X509Credentials is really a generic
 
449
        # GnuTLS certificate credentials object so long as no X.509
 
450
        # keys are added to it.  Therefore, we can use it here despite
 
451
        # using OpenPGP certificates.
 
452
        
 
453
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
454
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
455
        #                "+DHE-DSS"))
 
456
        priority = "NORMAL"             # Fallback default, since this
 
457
                                        # MUST be set.
 
458
        if self.server.settings["priority"]:
 
459
            priority = self.server.settings["priority"]
 
460
        gnutls.library.functions.gnutls_priority_set_direct\
 
461
            (session._c_object, priority, None);
 
462
        
 
463
        try:
 
464
            session.handshake()
 
465
        except gnutls.errors.GNUTLSError, error:
 
466
            logger.debug(u"Handshake failed: %s", error)
 
467
            # Do not run session.bye() here: the session is not
 
468
            # established.  Just abandon the request.
 
469
            return
 
470
        try:
 
471
            fpr = fingerprint(peer_certificate(session))
 
472
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
473
            logger.debug(u"Bad certificate: %s", error)
 
474
            session.bye()
 
475
            return
 
476
        logger.debug(u"Fingerprint: %s", fpr)
 
477
        client = None
 
478
        for c in self.server.clients:
 
479
            if c.fingerprint == fpr:
 
480
                client = c
 
481
                break
 
482
        if not client:
 
483
            logger.debug(u"Client not found for fingerprint: %s", fpr)
 
484
            session.bye()
 
485
            return
 
486
        # Have to check if client.still_valid(), since it is possible
 
487
        # that the client timed out while establishing the GnuTLS
 
488
        # session.
 
489
        if not client.still_valid():
 
490
            logger.debug(u"Client %(name)s is invalid", vars(client))
 
491
            session.bye()
 
492
            return
 
493
        sent_size = 0
 
494
        while sent_size < len(client.secret):
 
495
            sent = session.send(client.secret[sent_size:])
 
496
            logger.debug(u"Sent: %d, remaining: %d",
 
497
                         sent, len(client.secret)
 
498
                         - (sent_size + sent))
 
499
            sent_size += sent
 
500
        session.bye()
 
501
 
 
502
 
 
503
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
504
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
2572
505
    Attributes:
2573
 
        enabled:        Boolean; whether this server is activated yet
2574
 
        interface:      None or a network interface name (string)
2575
 
        use_ipv6:       Boolean; to use IPv6 or not
 
506
        settings:       Server settings
 
507
        clients:        Set() of Client objects
2576
508
    """
2577
 
 
2578
 
    def __init__(self, server_address, RequestHandlerClass,
2579
 
                 interface=None,
2580
 
                 use_ipv6=True,
2581
 
                 socketfd=None):
2582
 
        """If socketfd is set, use that file descriptor instead of
2583
 
        creating a new one with socket.socket().
2584
 
        """
2585
 
        self.interface = interface
2586
 
        if use_ipv6:
2587
 
            self.address_family = socket.AF_INET6
2588
 
        if socketfd is not None:
2589
 
            # Save the file descriptor
2590
 
            self.socketfd = socketfd
2591
 
            # Save the original socket.socket() function
2592
 
            self.socket_socket = socket.socket
2593
 
 
2594
 
            # To implement --socket, we monkey patch socket.socket.
2595
 
            #
2596
 
            # (When socketserver.TCPServer is a new-style class, we
2597
 
            # could make self.socket into a property instead of monkey
2598
 
            # patching socket.socket.)
2599
 
            #
2600
 
            # Create a one-time-only replacement for socket.socket()
2601
 
            @functools.wraps(socket.socket)
2602
 
            def socket_wrapper(*args, **kwargs):
2603
 
                # Restore original function so subsequent calls are
2604
 
                # not affected.
2605
 
                socket.socket = self.socket_socket
2606
 
                del self.socket_socket
2607
 
                # This time only, return a new socket object from the
2608
 
                # saved file descriptor.
2609
 
                return socket.fromfd(self.socketfd, *args, **kwargs)
2610
 
            # Replace socket.socket() function with wrapper
2611
 
            socket.socket = socket_wrapper
2612
 
        # The socketserver.TCPServer.__init__ will call
2613
 
        # socket.socket(), which might be our replacement,
2614
 
        # socket_wrapper(), if socketfd was set.
2615
 
        socketserver.TCPServer.__init__(self, server_address,
2616
 
                                        RequestHandlerClass)
2617
 
 
 
509
    address_family = socket.AF_INET6
 
510
    def __init__(self, *args, **kwargs):
 
511
        if "settings" in kwargs:
 
512
            self.settings = kwargs["settings"]
 
513
            del kwargs["settings"]
 
514
        if "clients" in kwargs:
 
515
            self.clients = kwargs["clients"]
 
516
            del kwargs["clients"]
 
517
        return super(type(self), self).__init__(*args, **kwargs)
2618
518
    def server_bind(self):
2619
519
        """This overrides the normal server_bind() function
2620
520
        to bind to an interface if one was specified, and also NOT to
2621
521
        bind to an address or port if they were not specified."""
2622
 
        global SO_BINDTODEVICE
2623
 
        if self.interface is not None:
2624
 
            if SO_BINDTODEVICE is None:
2625
 
                # Fall back to a hard-coded value which seems to be
2626
 
                # common enough.
2627
 
                logger.warning("SO_BINDTODEVICE not found, trying 25")
2628
 
                SO_BINDTODEVICE = 25
 
522
        if self.settings["interface"]:
 
523
            # 25 is from /usr/include/asm-i486/socket.h
 
524
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
2629
525
            try:
2630
 
                self.socket.setsockopt(
2631
 
                    socket.SOL_SOCKET, SO_BINDTODEVICE,
2632
 
                    (self.interface + "\0").encode("utf-8"))
2633
 
            except socket.error as error:
2634
 
                if error.errno == errno.EPERM:
2635
 
                    logger.error("No permission to bind to"
2636
 
                                 " interface %s", self.interface)
2637
 
                elif error.errno == errno.ENOPROTOOPT:
2638
 
                    logger.error("SO_BINDTODEVICE not available;"
2639
 
                                 " cannot bind to interface %s",
2640
 
                                 self.interface)
2641
 
                elif error.errno == errno.ENODEV:
2642
 
                    logger.error("Interface %s does not exist,"
2643
 
                                 " cannot bind", self.interface)
 
526
                self.socket.setsockopt(socket.SOL_SOCKET,
 
527
                                       SO_BINDTODEVICE,
 
528
                                       self.settings["interface"])
 
529
            except socket.error, error:
 
530
                if error[0] == errno.EPERM:
 
531
                    logger.warning(u"No permission to"
 
532
                                   u" bind to interface %s",
 
533
                                   self.settings["interface"])
2644
534
                else:
2645
 
                    raise
 
535
                    raise error
2646
536
        # Only bind(2) the socket if we really need to.
2647
537
        if self.server_address[0] or self.server_address[1]:
2648
 
            if self.server_address[1]:
2649
 
                self.allow_reuse_address = True
2650
538
            if not self.server_address[0]:
2651
 
                if self.address_family == socket.AF_INET6:
2652
 
                    any_address = "::"  # in6addr_any
2653
 
                else:
2654
 
                    any_address = "0.0.0.0"  # INADDR_ANY
2655
 
                self.server_address = (any_address,
 
539
                in6addr_any = "::"
 
540
                self.server_address = (in6addr_any,
2656
541
                                       self.server_address[1])
2657
 
            elif not self.server_address[1]:
2658
 
                self.server_address = (self.server_address[0], 0)
2659
 
#                 if self.interface:
2660
 
#                     self.server_address = (self.server_address[0],
2661
 
#                                            0, # port
2662
 
#                                            0, # flowinfo
2663
 
#                                            if_nametoindex
2664
 
#                                            (self.interface))
2665
 
            return socketserver.TCPServer.server_bind(self)
2666
 
 
2667
 
 
2668
 
class MandosServer(IPv6_TCPServer):
2669
 
    """Mandos server.
2670
 
 
2671
 
    Attributes:
2672
 
        clients:        set of Client objects
2673
 
        gnutls_priority GnuTLS priority string
2674
 
        use_dbus:       Boolean; to emit D-Bus signals or not
2675
 
 
2676
 
    Assumes a GLib.MainLoop event loop.
2677
 
    """
2678
 
 
2679
 
    def __init__(self, server_address, RequestHandlerClass,
2680
 
                 interface=None,
2681
 
                 use_ipv6=True,
2682
 
                 clients=None,
2683
 
                 gnutls_priority=None,
2684
 
                 use_dbus=True,
2685
 
                 socketfd=None):
2686
 
        self.enabled = False
2687
 
        self.clients = clients
2688
 
        if self.clients is None:
2689
 
            self.clients = {}
2690
 
        self.use_dbus = use_dbus
2691
 
        self.gnutls_priority = gnutls_priority
2692
 
        IPv6_TCPServer.__init__(self, server_address,
2693
 
                                RequestHandlerClass,
2694
 
                                interface=interface,
2695
 
                                use_ipv6=use_ipv6,
2696
 
                                socketfd=socketfd)
2697
 
 
2698
 
    def server_activate(self):
2699
 
        if self.enabled:
2700
 
            return socketserver.TCPServer.server_activate(self)
2701
 
 
2702
 
    def enable(self):
2703
 
        self.enabled = True
2704
 
 
2705
 
    def add_pipe(self, parent_pipe, proc):
2706
 
        # Call "handle_ipc" for both data and EOF events
2707
 
        GLib.io_add_watch(
2708
 
            GLib.IOChannel.unix_new(parent_pipe.fileno()),
2709
 
            GLib.PRIORITY_DEFAULT, GLib.IO_IN | GLib.IO_HUP,
2710
 
            functools.partial(self.handle_ipc,
2711
 
                              parent_pipe=parent_pipe,
2712
 
                              proc=proc))
2713
 
 
2714
 
    def handle_ipc(self, source, condition,
2715
 
                   parent_pipe=None,
2716
 
                   proc=None,
2717
 
                   client_object=None):
2718
 
        # error, or the other end of multiprocessing.Pipe has closed
2719
 
        if condition & (GLib.IO_ERR | GLib.IO_HUP):
2720
 
            # Wait for other process to exit
2721
 
            proc.join()
2722
 
            return False
2723
 
 
2724
 
        # Read a request from the child
2725
 
        request = parent_pipe.recv()
2726
 
        command = request[0]
2727
 
 
2728
 
        if command == 'init':
2729
 
            key_id = request[1].decode("ascii")
2730
 
            fpr = request[2].decode("ascii")
2731
 
            address = request[3]
2732
 
 
2733
 
            for c in self.clients.values():
2734
 
                if key_id == ("E3B0C44298FC1C149AFBF4C8996FB924"
2735
 
                              "27AE41E4649B934CA495991B7852B855"):
2736
 
                    continue
2737
 
                if key_id and c.key_id == key_id:
2738
 
                    client = c
2739
 
                    break
2740
 
                if fpr and c.fingerprint == fpr:
2741
 
                    client = c
2742
 
                    break
2743
 
            else:
2744
 
                logger.info("Client not found for key ID: %s, address"
2745
 
                            ": %s", key_id or fpr, address)
2746
 
                if self.use_dbus:
2747
 
                    # Emit D-Bus signal
2748
 
                    mandos_dbus_service.ClientNotFound(key_id or fpr,
2749
 
                                                       address[0])
2750
 
                parent_pipe.send(False)
2751
 
                return False
2752
 
 
2753
 
            GLib.io_add_watch(
2754
 
                GLib.IOChannel.unix_new(parent_pipe.fileno()),
2755
 
                GLib.PRIORITY_DEFAULT, GLib.IO_IN | GLib.IO_HUP,
2756
 
                functools.partial(self.handle_ipc,
2757
 
                                  parent_pipe=parent_pipe,
2758
 
                                  proc=proc,
2759
 
                                  client_object=client))
2760
 
            parent_pipe.send(True)
2761
 
            # remove the old hook in favor of the new above hook on
2762
 
            # same fileno
2763
 
            return False
2764
 
        if command == 'funcall':
2765
 
            funcname = request[1]
2766
 
            args = request[2]
2767
 
            kwargs = request[3]
2768
 
 
2769
 
            parent_pipe.send(('data', getattr(client_object,
2770
 
                                              funcname)(*args,
2771
 
                                                        **kwargs)))
2772
 
 
2773
 
        if command == 'getattr':
2774
 
            attrname = request[1]
2775
 
            if isinstance(client_object.__getattribute__(attrname),
2776
 
                          collections.abc.Callable):
2777
 
                parent_pipe.send(('function', ))
2778
 
            else:
2779
 
                parent_pipe.send((
2780
 
                    'data', client_object.__getattribute__(attrname)))
2781
 
 
2782
 
        if command == 'setattr':
2783
 
            attrname = request[1]
2784
 
            value = request[2]
2785
 
            setattr(client_object, attrname, value)
2786
 
 
2787
 
        return True
2788
 
 
2789
 
 
2790
 
def rfc3339_duration_to_delta(duration):
2791
 
    """Parse an RFC 3339 "duration" and return a datetime.timedelta
2792
 
 
2793
 
    >>> timedelta = datetime.timedelta
2794
 
    >>> rfc3339_duration_to_delta("P7D") == timedelta(7)
2795
 
    True
2796
 
    >>> rfc3339_duration_to_delta("PT60S") == timedelta(0, 60)
2797
 
    True
2798
 
    >>> rfc3339_duration_to_delta("PT60M") == timedelta(0, 3600)
2799
 
    True
2800
 
    >>> rfc3339_duration_to_delta("PT24H") == timedelta(1)
2801
 
    True
2802
 
    >>> rfc3339_duration_to_delta("P1W") == timedelta(7)
2803
 
    True
2804
 
    >>> rfc3339_duration_to_delta("PT5M30S") == timedelta(0, 330)
2805
 
    True
2806
 
    >>> rfc3339_duration_to_delta("P1DT3M20S") == timedelta(1, 200)
2807
 
    True
2808
 
    >>> del timedelta
2809
 
    """
2810
 
 
2811
 
    # Parsing an RFC 3339 duration with regular expressions is not
2812
 
    # possible - there would have to be multiple places for the same
2813
 
    # values, like seconds.  The current code, while more esoteric, is
2814
 
    # cleaner without depending on a parsing library.  If Python had a
2815
 
    # built-in library for parsing we would use it, but we'd like to
2816
 
    # avoid excessive use of external libraries.
2817
 
 
2818
 
    # New type for defining tokens, syntax, and semantics all-in-one
2819
 
    Token = collections.namedtuple("Token", (
2820
 
        "regexp",  # To match token; if "value" is not None, must have
2821
 
                   # a "group" containing digits
2822
 
        "value",   # datetime.timedelta or None
2823
 
        "followers"))           # Tokens valid after this token
2824
 
    # RFC 3339 "duration" tokens, syntax, and semantics; taken from
2825
 
    # the "duration" ABNF definition in RFC 3339, Appendix A.
2826
 
    token_end = Token(re.compile(r"$"), None, frozenset())
2827
 
    token_second = Token(re.compile(r"(\d+)S"),
2828
 
                         datetime.timedelta(seconds=1),
2829
 
                         frozenset((token_end, )))
2830
 
    token_minute = Token(re.compile(r"(\d+)M"),
2831
 
                         datetime.timedelta(minutes=1),
2832
 
                         frozenset((token_second, token_end)))
2833
 
    token_hour = Token(re.compile(r"(\d+)H"),
2834
 
                       datetime.timedelta(hours=1),
2835
 
                       frozenset((token_minute, token_end)))
2836
 
    token_time = Token(re.compile(r"T"),
2837
 
                       None,
2838
 
                       frozenset((token_hour, token_minute,
2839
 
                                  token_second)))
2840
 
    token_day = Token(re.compile(r"(\d+)D"),
2841
 
                      datetime.timedelta(days=1),
2842
 
                      frozenset((token_time, token_end)))
2843
 
    token_month = Token(re.compile(r"(\d+)M"),
2844
 
                        datetime.timedelta(weeks=4),
2845
 
                        frozenset((token_day, token_end)))
2846
 
    token_year = Token(re.compile(r"(\d+)Y"),
2847
 
                       datetime.timedelta(weeks=52),
2848
 
                       frozenset((token_month, token_end)))
2849
 
    token_week = Token(re.compile(r"(\d+)W"),
2850
 
                       datetime.timedelta(weeks=1),
2851
 
                       frozenset((token_end, )))
2852
 
    token_duration = Token(re.compile(r"P"), None,
2853
 
                           frozenset((token_year, token_month,
2854
 
                                      token_day, token_time,
2855
 
                                      token_week)))
2856
 
    # Define starting values:
2857
 
    # Value so far
2858
 
    value = datetime.timedelta()
2859
 
    found_token = None
2860
 
    # Following valid tokens
2861
 
    followers = frozenset((token_duration, ))
2862
 
    # String left to parse
2863
 
    s = duration
2864
 
    # Loop until end token is found
2865
 
    while found_token is not token_end:
2866
 
        # Search for any currently valid tokens
2867
 
        for token in followers:
2868
 
            match = token.regexp.match(s)
2869
 
            if match is not None:
2870
 
                # Token found
2871
 
                if token.value is not None:
2872
 
                    # Value found, parse digits
2873
 
                    factor = int(match.group(1), 10)
2874
 
                    # Add to value so far
2875
 
                    value += factor * token.value
2876
 
                # Strip token from string
2877
 
                s = token.regexp.sub("", s, 1)
2878
 
                # Go to found token
2879
 
                found_token = token
2880
 
                # Set valid next tokens
2881
 
                followers = found_token.followers
2882
 
                break
2883
 
        else:
2884
 
            # No currently valid tokens were found
2885
 
            raise ValueError("Invalid RFC 3339 duration: {!r}"
2886
 
                             .format(duration))
2887
 
    # End token found
2888
 
    return value
 
542
            elif self.server_address[1] is None:
 
543
                self.server_address = (self.server_address[0],
 
544
                                       0)
 
545
            return super(type(self), self).server_bind()
2889
546
 
2890
547
 
2891
548
def string_to_delta(interval):
2892
549
    """Parse a string and return a datetime.timedelta
2893
550
 
2894
 
    >>> string_to_delta('7d') == datetime.timedelta(7)
2895
 
    True
2896
 
    >>> string_to_delta('60s') == datetime.timedelta(0, 60)
2897
 
    True
2898
 
    >>> string_to_delta('60m') == datetime.timedelta(0, 3600)
2899
 
    True
2900
 
    >>> string_to_delta('24h') == datetime.timedelta(1)
2901
 
    True
2902
 
    >>> string_to_delta('1w') == datetime.timedelta(7)
2903
 
    True
2904
 
    >>> string_to_delta('5m 30s') == datetime.timedelta(0, 330)
2905
 
    True
 
551
    >>> string_to_delta('7d')
 
552
    datetime.timedelta(7)
 
553
    >>> string_to_delta('60s')
 
554
    datetime.timedelta(0, 60)
 
555
    >>> string_to_delta('60m')
 
556
    datetime.timedelta(0, 3600)
 
557
    >>> string_to_delta('24h')
 
558
    datetime.timedelta(1)
 
559
    >>> string_to_delta(u'1w')
 
560
    datetime.timedelta(7)
2906
561
    """
2907
 
 
2908
 
    try:
2909
 
        return rfc3339_duration_to_delta(interval)
2910
 
    except ValueError:
2911
 
        pass
2912
 
 
2913
 
    timevalue = datetime.timedelta(0)
2914
 
    for s in interval.split():
2915
 
        try:
2916
 
            suffix = s[-1]
2917
 
            value = int(s[:-1])
2918
 
            if suffix == "d":
2919
 
                delta = datetime.timedelta(value)
2920
 
            elif suffix == "s":
2921
 
                delta = datetime.timedelta(0, value)
2922
 
            elif suffix == "m":
2923
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
2924
 
            elif suffix == "h":
2925
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
2926
 
            elif suffix == "w":
2927
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
2928
 
            else:
2929
 
                raise ValueError("Unknown suffix {!r}".format(suffix))
2930
 
        except IndexError as e:
2931
 
            raise ValueError(*(e.args))
2932
 
        timevalue += delta
2933
 
    return timevalue
2934
 
 
2935
 
 
2936
 
def daemon(nochdir=False, noclose=False):
 
562
    try:
 
563
        suffix=unicode(interval[-1])
 
564
        value=int(interval[:-1])
 
565
        if suffix == u"d":
 
566
            delta = datetime.timedelta(value)
 
567
        elif suffix == u"s":
 
568
            delta = datetime.timedelta(0, value)
 
569
        elif suffix == u"m":
 
570
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
571
        elif suffix == u"h":
 
572
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
573
        elif suffix == u"w":
 
574
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
575
        else:
 
576
            raise ValueError
 
577
    except (ValueError, IndexError):
 
578
        raise ValueError
 
579
    return delta
 
580
 
 
581
 
 
582
def server_state_changed(state):
 
583
    """Derived from the Avahi example code"""
 
584
    if state == avahi.SERVER_COLLISION:
 
585
        logger.warning(u"Server name collision")
 
586
        service.remove()
 
587
    elif state == avahi.SERVER_RUNNING:
 
588
        service.add()
 
589
 
 
590
 
 
591
def entry_group_state_changed(state, error):
 
592
    """Derived from the Avahi example code"""
 
593
    logger.debug(u"state change: %i", state)
 
594
    
 
595
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
596
        logger.debug(u"Service established.")
 
597
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
598
        logger.warning(u"Service name collision.")
 
599
        service.rename()
 
600
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
601
        logger.critical(u"Error in group state changed %s",
 
602
                        unicode(error))
 
603
        raise AvahiGroupError("State changed: %s", str(error))
 
604
 
 
605
def if_nametoindex(interface):
 
606
    """Call the C function if_nametoindex(), or equivalent"""
 
607
    global if_nametoindex
 
608
    try:
 
609
        if "ctypes.util" not in sys.modules:
 
610
            import ctypes.util
 
611
        if_nametoindex = ctypes.cdll.LoadLibrary\
 
612
            (ctypes.util.find_library("c")).if_nametoindex
 
613
    except (OSError, AttributeError):
 
614
        if "struct" not in sys.modules:
 
615
            import struct
 
616
        if "fcntl" not in sys.modules:
 
617
            import fcntl
 
618
        def if_nametoindex(interface):
 
619
            "Get an interface index the hard way, i.e. using fcntl()"
 
620
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
621
            s = socket.socket()
 
622
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
623
                                struct.pack("16s16x", interface))
 
624
            s.close()
 
625
            interface_index = struct.unpack("I", ifreq[16:20])[0]
 
626
            return interface_index
 
627
    return if_nametoindex(interface)
 
628
 
 
629
 
 
630
def daemon(nochdir, noclose):
2937
631
    """See daemon(3).  Standard BSD Unix function.
2938
 
 
2939
632
    This should really exist as os.daemon, but it doesn't (yet)."""
2940
633
    if os.fork():
2941
634
        sys.exit()
2942
635
    os.setsid()
2943
636
    if not nochdir:
2944
637
        os.chdir("/")
2945
 
    if os.fork():
2946
 
        sys.exit()
2947
638
    if not noclose:
2948
639
        # Close all standard open file descriptors
2949
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
 
640
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
2950
641
        if not stat.S_ISCHR(os.fstat(null).st_mode):
2951
642
            raise OSError(errno.ENODEV,
2952
 
                          "{} not a character device"
2953
 
                          .format(os.devnull))
 
643
                          "/dev/null not a character device")
2954
644
        os.dup2(null, sys.stdin.fileno())
2955
645
        os.dup2(null, sys.stdout.fileno())
2956
646
        os.dup2(null, sys.stderr.fileno())
2959
649
 
2960
650
 
2961
651
def main():
2962
 
 
2963
 
    ##################################################################
2964
 
    # Parsing of options, both command line and config file
2965
 
 
2966
 
    parser = argparse.ArgumentParser()
2967
 
    parser.add_argument("-v", "--version", action="version",
2968
 
                        version="%(prog)s {}".format(version),
2969
 
                        help="show version number and exit")
2970
 
    parser.add_argument("-i", "--interface", metavar="IF",
2971
 
                        help="Bind to interface IF")
2972
 
    parser.add_argument("-a", "--address",
2973
 
                        help="Address to listen for requests on")
2974
 
    parser.add_argument("-p", "--port", type=int,
2975
 
                        help="Port number to receive requests on")
2976
 
    parser.add_argument("--check", action="store_true",
2977
 
                        help="Run self-test")
2978
 
    parser.add_argument("--debug", action="store_true",
2979
 
                        help="Debug mode; run in foreground and log"
2980
 
                        " to terminal", default=None)
2981
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
2982
 
                        help="Debug level for stdout output")
2983
 
    parser.add_argument("--priority", help="GnuTLS"
2984
 
                        " priority string (see GnuTLS documentation)")
2985
 
    parser.add_argument("--servicename",
2986
 
                        metavar="NAME", help="Zeroconf service name")
2987
 
    parser.add_argument("--configdir",
2988
 
                        default="/etc/mandos", metavar="DIR",
2989
 
                        help="Directory to search for configuration"
2990
 
                        " files")
2991
 
    parser.add_argument("--no-dbus", action="store_false",
2992
 
                        dest="use_dbus", help="Do not provide D-Bus"
2993
 
                        " system bus interface", default=None)
2994
 
    parser.add_argument("--no-ipv6", action="store_false",
2995
 
                        dest="use_ipv6", help="Do not use IPv6",
2996
 
                        default=None)
2997
 
    parser.add_argument("--no-restore", action="store_false",
2998
 
                        dest="restore", help="Do not restore stored"
2999
 
                        " state", default=None)
3000
 
    parser.add_argument("--socket", type=int,
3001
 
                        help="Specify a file descriptor to a network"
3002
 
                        " socket to use instead of creating one")
3003
 
    parser.add_argument("--statedir", metavar="DIR",
3004
 
                        help="Directory to save/restore state in")
3005
 
    parser.add_argument("--foreground", action="store_true",
3006
 
                        help="Run in foreground", default=None)
3007
 
    parser.add_argument("--no-zeroconf", action="store_false",
3008
 
                        dest="zeroconf", help="Do not use Zeroconf",
3009
 
                        default=None)
3010
 
 
3011
 
    options = parser.parse_args()
3012
 
 
 
652
    global main_loop_started
 
653
    main_loop_started = False
 
654
    
 
655
    parser = OptionParser()
 
656
    parser.add_option("-i", "--interface", type="string",
 
657
                      metavar="IF", help="Bind to interface IF")
 
658
    parser.add_option("-a", "--address", type="string",
 
659
                      help="Address to listen for requests on")
 
660
    parser.add_option("-p", "--port", type="int",
 
661
                      help="Port number to receive requests on")
 
662
    parser.add_option("--check", action="store_true", default=False,
 
663
                      help="Run self-test")
 
664
    parser.add_option("--debug", action="store_true", default=False,
 
665
                      help="Debug mode; run in foreground and log to"
 
666
                      " terminal")
 
667
    parser.add_option("--priority", type="string", help="GnuTLS"
 
668
                      " priority string (see GnuTLS documentation)")
 
669
    parser.add_option("--servicename", type="string", metavar="NAME",
 
670
                      help="Zeroconf service name")
 
671
    parser.add_option("--configdir", type="string",
 
672
                      default="/etc/mandos", metavar="DIR",
 
673
                      help="Directory to search for configuration"
 
674
                      " files")
 
675
    (options, args) = parser.parse_args()
 
676
    
 
677
    if options.check:
 
678
        import doctest
 
679
        doctest.testmod()
 
680
        sys.exit()
 
681
    
3013
682
    # Default values for config file for server-global settings
3014
 
    if gnutls.has_rawpk:
3015
 
        priority = ("SECURE128:!CTYPE-X.509:+CTYPE-RAWPK:!RSA"
3016
 
                    ":!VERS-ALL:+VERS-TLS1.3:%PROFILE_ULTRA")
3017
 
    else:
3018
 
        priority = ("SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"
3019
 
                    ":+SIGN-DSA-SHA256")
3020
 
    server_defaults = {"interface": "",
3021
 
                       "address": "",
3022
 
                       "port": "",
3023
 
                       "debug": "False",
3024
 
                       "priority": priority,
3025
 
                       "servicename": "Mandos",
3026
 
                       "use_dbus": "True",
3027
 
                       "use_ipv6": "True",
3028
 
                       "debuglevel": "",
3029
 
                       "restore": "True",
3030
 
                       "socket": "",
3031
 
                       "statedir": "/var/lib/mandos",
3032
 
                       "foreground": "False",
3033
 
                       "zeroconf": "True",
3034
 
                       }
3035
 
    del priority
3036
 
 
 
683
    server_defaults = { "interface": "",
 
684
                        "address": "",
 
685
                        "port": "",
 
686
                        "debug": "False",
 
687
                        "priority":
 
688
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
689
                        "servicename": "Mandos",
 
690
                        }
 
691
    
3037
692
    # Parse config file for server-global settings
3038
 
    server_config = configparser.ConfigParser(server_defaults)
 
693
    server_config = ConfigParser.SafeConfigParser(server_defaults)
3039
694
    del server_defaults
3040
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
3041
 
    # Convert the ConfigParser object to a dict
3042
 
    server_settings = server_config.defaults()
3043
 
    # Use the appropriate methods on the non-string config options
3044
 
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
3045
 
                   "foreground", "zeroconf"):
3046
 
        server_settings[option] = server_config.getboolean("DEFAULT",
3047
 
                                                           option)
3048
 
    if server_settings["port"]:
3049
 
        server_settings["port"] = server_config.getint("DEFAULT",
3050
 
                                                       "port")
3051
 
    if server_settings["socket"]:
3052
 
        server_settings["socket"] = server_config.getint("DEFAULT",
3053
 
                                                         "socket")
3054
 
        # Later, stdin will, and stdout and stderr might, be dup'ed
3055
 
        # over with an opened os.devnull.  But we don't want this to
3056
 
        # happen with a supplied network socket.
3057
 
        if 0 <= server_settings["socket"] <= 2:
3058
 
            server_settings["socket"] = os.dup(server_settings
3059
 
                                               ["socket"])
 
695
    server_config.read(os.path.join(options.configdir, "server.conf"))
 
696
    server_section = "server"
 
697
    # Convert the SafeConfigParser object to a dict
 
698
    server_settings = dict(server_config.items(server_section))
 
699
    # Use getboolean on the boolean config option
 
700
    server_settings["debug"] = server_config.getboolean\
 
701
                               (server_section, "debug")
3060
702
    del server_config
3061
 
 
 
703
    
3062
704
    # Override the settings from the config file with command line
3063
705
    # options, if set.
3064
706
    for option in ("interface", "address", "port", "debug",
3065
 
                   "priority", "servicename", "configdir", "use_dbus",
3066
 
                   "use_ipv6", "debuglevel", "restore", "statedir",
3067
 
                   "socket", "foreground", "zeroconf"):
 
707
                   "priority", "servicename", "configdir"):
3068
708
        value = getattr(options, option)
3069
709
        if value is not None:
3070
710
            server_settings[option] = value
3071
711
    del options
3072
 
    # Force all strings to be unicode
3073
 
    for option in server_settings.keys():
3074
 
        if isinstance(server_settings[option], bytes):
3075
 
            server_settings[option] = (server_settings[option]
3076
 
                                       .decode("utf-8"))
3077
 
    # Force all boolean options to be boolean
3078
 
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
3079
 
                   "foreground", "zeroconf"):
3080
 
        server_settings[option] = bool(server_settings[option])
3081
 
    # Debug implies foreground
3082
 
    if server_settings["debug"]:
3083
 
        server_settings["foreground"] = True
3084
712
    # Now we have our good server settings in "server_settings"
3085
 
 
3086
 
    ##################################################################
3087
 
 
3088
 
    if (not server_settings["zeroconf"]
3089
 
        and not (server_settings["port"]
3090
 
                 or server_settings["socket"] != "")):
3091
 
        parser.error("Needs port or socket to work without Zeroconf")
3092
 
 
3093
 
    # For convenience
3094
 
    debug = server_settings["debug"]
3095
 
    debuglevel = server_settings["debuglevel"]
3096
 
    use_dbus = server_settings["use_dbus"]
3097
 
    use_ipv6 = server_settings["use_ipv6"]
3098
 
    stored_state_path = os.path.join(server_settings["statedir"],
3099
 
                                     stored_state_file)
3100
 
    foreground = server_settings["foreground"]
3101
 
    zeroconf = server_settings["zeroconf"]
3102
 
 
3103
 
    if debug:
3104
 
        initlogger(debug, logging.DEBUG)
3105
 
    else:
3106
 
        if not debuglevel:
3107
 
            initlogger(debug)
3108
 
        else:
3109
 
            level = getattr(logging, debuglevel.upper())
3110
 
            initlogger(debug, level)
3111
 
 
3112
 
    if server_settings["servicename"] != "Mandos":
3113
 
        syslogger.setFormatter(
3114
 
            logging.Formatter('Mandos ({}) [%(process)d]:'
3115
 
                              ' %(levelname)s: %(message)s'.format(
3116
 
                                  server_settings["servicename"])))
3117
 
 
 
713
    
3118
714
    # Parse config file with clients
3119
 
    client_config = configparser.ConfigParser(Client.client_defaults)
 
715
    client_defaults = { "timeout": "1h",
 
716
                        "interval": "5m",
 
717
                        "checker": "fping -q -- %%(fqdn)s",
 
718
                        }
 
719
    client_config = ConfigParser.SafeConfigParser(client_defaults)
3120
720
    client_config.read(os.path.join(server_settings["configdir"],
3121
721
                                    "clients.conf"))
3122
 
 
3123
 
    global mandos_dbus_service
3124
 
    mandos_dbus_service = None
3125
 
 
3126
 
    socketfd = None
3127
 
    if server_settings["socket"] != "":
3128
 
        socketfd = server_settings["socket"]
3129
 
    tcp_server = MandosServer(
3130
 
        (server_settings["address"], server_settings["port"]),
3131
 
        ClientHandler,
3132
 
        interface=(server_settings["interface"] or None),
3133
 
        use_ipv6=use_ipv6,
3134
 
        gnutls_priority=server_settings["priority"],
3135
 
        use_dbus=use_dbus,
3136
 
        socketfd=socketfd)
3137
 
    if not foreground:
3138
 
        pidfilename = "/run/mandos.pid"
3139
 
        if not os.path.isdir("/run/."):
3140
 
            pidfilename = "/var/run/mandos.pid"
3141
 
        pidfile = None
3142
 
        try:
3143
 
            pidfile = codecs.open(pidfilename, "w", encoding="utf-8")
3144
 
        except IOError as e:
3145
 
            logger.error("Could not open file %r", pidfilename,
3146
 
                         exc_info=e)
3147
 
 
3148
 
    for name, group in (("_mandos", "_mandos"),
3149
 
                        ("mandos", "mandos"),
3150
 
                        ("nobody", "nogroup")):
3151
 
        try:
3152
 
            uid = pwd.getpwnam(name).pw_uid
3153
 
            gid = pwd.getpwnam(group).pw_gid
3154
 
            break
3155
 
        except KeyError:
3156
 
            continue
3157
 
    else:
3158
 
        uid = 65534
3159
 
        gid = 65534
3160
 
    try:
3161
 
        os.setgid(gid)
3162
 
        os.setuid(uid)
3163
 
        if debug:
3164
 
            logger.debug("Did setuid/setgid to {}:{}".format(uid,
3165
 
                                                             gid))
3166
 
    except OSError as error:
3167
 
        logger.warning("Failed to setuid/setgid to {}:{}: {}"
3168
 
                       .format(uid, gid, os.strerror(error.errno)))
3169
 
        if error.errno != errno.EPERM:
3170
 
            raise
3171
 
 
3172
 
    if debug:
3173
 
        # Enable all possible GnuTLS debugging
3174
 
 
3175
 
        # "Use a log level over 10 to enable all debugging options."
3176
 
        # - GnuTLS manual
3177
 
        gnutls.global_set_log_level(11)
3178
 
 
3179
 
        @gnutls.log_func
3180
 
        def debug_gnutls(level, string):
3181
 
            logger.debug("GnuTLS: %s", string[:-1])
3182
 
 
3183
 
        gnutls.global_set_log_function(debug_gnutls)
3184
 
 
3185
 
        # Redirect stdin so all checkers get /dev/null
3186
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
3187
 
        os.dup2(null, sys.stdin.fileno())
3188
 
        if null > 2:
3189
 
            os.close(null)
3190
 
 
3191
 
    # Need to fork before connecting to D-Bus
3192
 
    if not foreground:
3193
 
        # Close all input and output, do double fork, etc.
3194
 
        daemon()
3195
 
 
3196
 
    if gi.version_info < (3, 10, 2):
3197
 
        # multiprocessing will use threads, so before we use GLib we
3198
 
        # need to inform GLib that threads will be used.
3199
 
        GLib.threads_init()
3200
 
 
 
722
    
 
723
    global service
 
724
    service = AvahiService(name = server_settings["servicename"],
 
725
                           type = "_mandos._tcp", );
 
726
    if server_settings["interface"]:
 
727
        service.interface = if_nametoindex(server_settings["interface"])
 
728
    
3201
729
    global main_loop
 
730
    global bus
 
731
    global server
3202
732
    # From the Avahi example code
3203
 
    DBusGMainLoop(set_as_default=True)
3204
 
    main_loop = GLib.MainLoop()
 
733
    DBusGMainLoop(set_as_default=True )
 
734
    main_loop = gobject.MainLoop()
3205
735
    bus = dbus.SystemBus()
 
736
    server = dbus.Interface(
 
737
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
738
            avahi.DBUS_INTERFACE_SERVER )
3206
739
    # End of Avahi example code
3207
 
    if use_dbus:
3208
 
        try:
3209
 
            bus_name = dbus.service.BusName("se.recompile.Mandos",
3210
 
                                            bus,
3211
 
                                            do_not_queue=True)
3212
 
            old_bus_name = dbus.service.BusName(
3213
 
                "se.bsnet.fukt.Mandos", bus,
3214
 
                do_not_queue=True)
3215
 
        except dbus.exceptions.DBusException as e:
3216
 
            logger.error("Disabling D-Bus:", exc_info=e)
3217
 
            use_dbus = False
3218
 
            server_settings["use_dbus"] = False
3219
 
            tcp_server.use_dbus = False
3220
 
    if zeroconf:
3221
 
        protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
3222
 
        service = AvahiServiceToSyslog(
3223
 
            name=server_settings["servicename"],
3224
 
            servicetype="_mandos._tcp",
3225
 
            protocol=protocol,
3226
 
            bus=bus)
3227
 
        if server_settings["interface"]:
3228
 
            service.interface = if_nametoindex(
3229
 
                server_settings["interface"].encode("utf-8"))
3230
 
 
3231
 
    global multiprocessing_manager
3232
 
    multiprocessing_manager = multiprocessing.Manager()
3233
 
 
3234
 
    client_class = Client
3235
 
    if use_dbus:
3236
 
        client_class = functools.partial(ClientDBus, bus=bus)
3237
 
 
3238
 
    client_settings = Client.config_parser(client_config)
3239
 
    old_client_settings = {}
3240
 
    clients_data = {}
3241
 
 
3242
 
    # This is used to redirect stdout and stderr for checker processes
3243
 
    global wnull
3244
 
    wnull = open(os.devnull, "w")  # A writable /dev/null
3245
 
    # Only used if server is running in foreground but not in debug
3246
 
    # mode
3247
 
    if debug or not foreground:
3248
 
        wnull.close()
3249
 
 
3250
 
    # Get client data and settings from last running state.
3251
 
    if server_settings["restore"]:
3252
 
        try:
3253
 
            with open(stored_state_path, "rb") as stored_state:
3254
 
                if sys.version_info.major == 2:
3255
 
                    clients_data, old_client_settings = pickle.load(
3256
 
                        stored_state)
3257
 
                else:
3258
 
                    bytes_clients_data, bytes_old_client_settings = (
3259
 
                        pickle.load(stored_state, encoding="bytes"))
3260
 
                    #   Fix bytes to strings
3261
 
                    #  clients_data
3262
 
                    # .keys()
3263
 
                    clients_data = {(key.decode("utf-8")
3264
 
                                     if isinstance(key, bytes)
3265
 
                                     else key): value
3266
 
                                    for key, value in
3267
 
                                    bytes_clients_data.items()}
3268
 
                    del bytes_clients_data
3269
 
                    for key in clients_data:
3270
 
                        value = {(k.decode("utf-8")
3271
 
                                  if isinstance(k, bytes) else k): v
3272
 
                                 for k, v in
3273
 
                                 clients_data[key].items()}
3274
 
                        clients_data[key] = value
3275
 
                        # .client_structure
3276
 
                        value["client_structure"] = [
3277
 
                            (s.decode("utf-8")
3278
 
                             if isinstance(s, bytes)
3279
 
                             else s) for s in
3280
 
                            value["client_structure"]]
3281
 
                        # .name, .host, and .checker_command
3282
 
                        for k in ("name", "host", "checker_command"):
3283
 
                            if isinstance(value[k], bytes):
3284
 
                                value[k] = value[k].decode("utf-8")
3285
 
                        if "key_id" not in value:
3286
 
                            value["key_id"] = ""
3287
 
                        elif "fingerprint" not in value:
3288
 
                            value["fingerprint"] = ""
3289
 
                    #  old_client_settings
3290
 
                    # .keys()
3291
 
                    old_client_settings = {
3292
 
                        (key.decode("utf-8")
3293
 
                         if isinstance(key, bytes)
3294
 
                         else key): value
3295
 
                        for key, value in
3296
 
                        bytes_old_client_settings.items()}
3297
 
                    del bytes_old_client_settings
3298
 
                    # .host and .checker_command
3299
 
                    for value in old_client_settings.values():
3300
 
                        for attribute in ("host", "checker_command"):
3301
 
                            if isinstance(value[attribute], bytes):
3302
 
                                value[attribute] = (value[attribute]
3303
 
                                                    .decode("utf-8"))
3304
 
            os.remove(stored_state_path)
3305
 
        except IOError as e:
3306
 
            if e.errno == errno.ENOENT:
3307
 
                logger.warning("Could not load persistent state:"
3308
 
                               " {}".format(os.strerror(e.errno)))
3309
 
            else:
3310
 
                logger.critical("Could not load persistent state:",
3311
 
                                exc_info=e)
3312
 
                raise
3313
 
        except EOFError as e:
3314
 
            logger.warning("Could not load persistent state: "
3315
 
                           "EOFError:",
3316
 
                           exc_info=e)
3317
 
 
3318
 
    with PGPEngine() as pgp:
3319
 
        for client_name, client in clients_data.items():
3320
 
            # Skip removed clients
3321
 
            if client_name not in client_settings:
3322
 
                continue
3323
 
 
3324
 
            # Decide which value to use after restoring saved state.
3325
 
            # We have three different values: Old config file,
3326
 
            # new config file, and saved state.
3327
 
            # New config value takes precedence if it differs from old
3328
 
            # config value, otherwise use saved state.
3329
 
            for name, value in client_settings[client_name].items():
3330
 
                try:
3331
 
                    # For each value in new config, check if it
3332
 
                    # differs from the old config value (Except for
3333
 
                    # the "secret" attribute)
3334
 
                    if (name != "secret"
3335
 
                        and (value !=
3336
 
                             old_client_settings[client_name][name])):
3337
 
                        client[name] = value
3338
 
                except KeyError:
3339
 
                    pass
3340
 
 
3341
 
            # Clients who has passed its expire date can still be
3342
 
            # enabled if its last checker was successful.  A Client
3343
 
            # whose checker succeeded before we stored its state is
3344
 
            # assumed to have successfully run all checkers during
3345
 
            # downtime.
3346
 
            if client["enabled"]:
3347
 
                if datetime.datetime.utcnow() >= client["expires"]:
3348
 
                    if not client["last_checked_ok"]:
3349
 
                        logger.warning(
3350
 
                            "disabling client {} - Client never "
3351
 
                            "performed a successful checker".format(
3352
 
                                client_name))
3353
 
                        client["enabled"] = False
3354
 
                    elif client["last_checker_status"] != 0:
3355
 
                        logger.warning(
3356
 
                            "disabling client {} - Client last"
3357
 
                            " checker failed with error code"
3358
 
                            " {}".format(
3359
 
                                client_name,
3360
 
                                client["last_checker_status"]))
3361
 
                        client["enabled"] = False
3362
 
                    else:
3363
 
                        client["expires"] = (
3364
 
                            datetime.datetime.utcnow()
3365
 
                            + client["timeout"])
3366
 
                        logger.debug("Last checker succeeded,"
3367
 
                                     " keeping {} enabled".format(
3368
 
                                         client_name))
3369
 
            try:
3370
 
                client["secret"] = pgp.decrypt(
3371
 
                    client["encrypted_secret"],
3372
 
                    client_settings[client_name]["secret"])
3373
 
            except PGPError:
3374
 
                # If decryption fails, we use secret from new settings
3375
 
                logger.debug("Failed to decrypt {} old secret".format(
3376
 
                    client_name))
3377
 
                client["secret"] = (client_settings[client_name]
3378
 
                                    ["secret"])
3379
 
 
3380
 
    # Add/remove clients based on new changes made to config
3381
 
    for client_name in (set(old_client_settings)
3382
 
                        - set(client_settings)):
3383
 
        del clients_data[client_name]
3384
 
    for client_name in (set(client_settings)
3385
 
                        - set(old_client_settings)):
3386
 
        clients_data[client_name] = client_settings[client_name]
3387
 
 
3388
 
    # Create all client objects
3389
 
    for client_name, client in clients_data.items():
3390
 
        tcp_server.clients[client_name] = client_class(
3391
 
            name=client_name,
3392
 
            settings=client,
3393
 
            server_settings=server_settings)
3394
 
 
3395
 
    if not tcp_server.clients:
3396
 
        logger.warning("No clients defined")
3397
 
 
3398
 
    if not foreground:
3399
 
        if pidfile is not None:
3400
 
            pid = os.getpid()
3401
 
            try:
3402
 
                with pidfile:
3403
 
                    print(pid, file=pidfile)
3404
 
            except IOError:
3405
 
                logger.error("Could not write to file %r with PID %d",
3406
 
                             pidfilename, pid)
3407
 
        del pidfile
3408
 
        del pidfilename
3409
 
 
3410
 
    for termsig in (signal.SIGHUP, signal.SIGTERM):
3411
 
        GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,
3412
 
                             lambda: main_loop.quit() and False)
3413
 
 
3414
 
    if use_dbus:
3415
 
 
3416
 
        @alternate_dbus_interfaces(
3417
 
            {"se.recompile.Mandos": "se.bsnet.fukt.Mandos"})
3418
 
        class MandosDBusService(DBusObjectWithObjectManager):
3419
 
            """A D-Bus proxy object"""
3420
 
 
3421
 
            def __init__(self):
3422
 
                dbus.service.Object.__init__(self, bus, "/")
3423
 
 
3424
 
            _interface = "se.recompile.Mandos"
3425
 
 
3426
 
            @dbus.service.signal(_interface, signature="o")
3427
 
            def ClientAdded(self, objpath):
3428
 
                "D-Bus signal"
3429
 
                pass
3430
 
 
3431
 
            @dbus.service.signal(_interface, signature="ss")
3432
 
            def ClientNotFound(self, key_id, address):
3433
 
                "D-Bus signal"
3434
 
                pass
3435
 
 
3436
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3437
 
                               "true"})
3438
 
            @dbus.service.signal(_interface, signature="os")
3439
 
            def ClientRemoved(self, objpath, name):
3440
 
                "D-Bus signal"
3441
 
                pass
3442
 
 
3443
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3444
 
                               "true"})
3445
 
            @dbus.service.method(_interface, out_signature="ao")
3446
 
            def GetAllClients(self):
3447
 
                "D-Bus method"
3448
 
                return dbus.Array(c.dbus_object_path for c in
3449
 
                                  tcp_server.clients.values())
3450
 
 
3451
 
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
3452
 
                               "true"})
3453
 
            @dbus.service.method(_interface,
3454
 
                                 out_signature="a{oa{sv}}")
3455
 
            def GetAllClientsWithProperties(self):
3456
 
                "D-Bus method"
3457
 
                return dbus.Dictionary(
3458
 
                    {c.dbus_object_path: c.GetAll(
3459
 
                        "se.recompile.Mandos.Client")
3460
 
                     for c in tcp_server.clients.values()},
3461
 
                    signature="oa{sv}")
3462
 
 
3463
 
            @dbus.service.method(_interface, in_signature="o")
3464
 
            def RemoveClient(self, object_path):
3465
 
                "D-Bus method"
3466
 
                for c in tcp_server.clients.values():
3467
 
                    if c.dbus_object_path == object_path:
3468
 
                        del tcp_server.clients[c.name]
3469
 
                        c.remove_from_connection()
3470
 
                        # Don't signal the disabling
3471
 
                        c.disable(quiet=True)
3472
 
                        # Emit D-Bus signal for removal
3473
 
                        self.client_removed_signal(c)
3474
 
                        return
3475
 
                raise KeyError(object_path)
3476
 
 
3477
 
            del _interface
3478
 
 
3479
 
            @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
3480
 
                                 out_signature="a{oa{sa{sv}}}")
3481
 
            def GetManagedObjects(self):
3482
 
                """D-Bus method"""
3483
 
                return dbus.Dictionary(
3484
 
                    {client.dbus_object_path:
3485
 
                     dbus.Dictionary(
3486
 
                         {interface: client.GetAll(interface)
3487
 
                          for interface in
3488
 
                          client._get_all_interface_names()})
3489
 
                     for client in tcp_server.clients.values()})
3490
 
 
3491
 
            def client_added_signal(self, client):
3492
 
                """Send the new standard signal and the old signal"""
3493
 
                if use_dbus:
3494
 
                    # New standard signal
3495
 
                    self.InterfacesAdded(
3496
 
                        client.dbus_object_path,
3497
 
                        dbus.Dictionary(
3498
 
                            {interface: client.GetAll(interface)
3499
 
                             for interface in
3500
 
                             client._get_all_interface_names()}))
3501
 
                    # Old signal
3502
 
                    self.ClientAdded(client.dbus_object_path)
3503
 
 
3504
 
            def client_removed_signal(self, client):
3505
 
                """Send the new standard signal and the old signal"""
3506
 
                if use_dbus:
3507
 
                    # New standard signal
3508
 
                    self.InterfacesRemoved(
3509
 
                        client.dbus_object_path,
3510
 
                        client._get_all_interface_names())
3511
 
                    # Old signal
3512
 
                    self.ClientRemoved(client.dbus_object_path,
3513
 
                                       client.name)
3514
 
 
3515
 
        mandos_dbus_service = MandosDBusService()
3516
 
 
3517
 
    # Save modules to variables to exempt the modules from being
3518
 
    # unloaded before the function registered with atexit() is run.
3519
 
    mp = multiprocessing
3520
 
    wn = wnull
3521
 
 
 
740
    
 
741
    debug = server_settings["debug"]
 
742
    
 
743
    if debug:
 
744
        console = logging.StreamHandler()
 
745
        # console.setLevel(logging.DEBUG)
 
746
        console.setFormatter(logging.Formatter\
 
747
                             ('%(levelname)s: %(message)s'))
 
748
        logger.addHandler(console)
 
749
        del console
 
750
    
 
751
    clients = Set()
 
752
    def remove_from_clients(client):
 
753
        clients.remove(client)
 
754
        if not clients:
 
755
            logger.debug(u"No clients left, exiting")
 
756
            sys.exit()
 
757
    
 
758
    clients.update(Set(Client(name=section,
 
759
                              stop_hook = remove_from_clients,
 
760
                              **(dict(client_config\
 
761
                                      .items(section))))
 
762
                       for section in client_config.sections()))
 
763
    
 
764
    if not debug:
 
765
        daemon(False, False)
 
766
    
3522
767
    def cleanup():
3523
768
        "Cleanup function; run on exit"
3524
 
        if zeroconf:
3525
 
            service.cleanup()
3526
 
 
3527
 
        mp.active_children()
3528
 
        wn.close()
3529
 
        if not (tcp_server.clients or client_settings):
3530
 
            return
3531
 
 
3532
 
        # Store client before exiting. Secrets are encrypted with key
3533
 
        # based on what config file has. If config file is
3534
 
        # removed/edited, old secret will thus be unrecovable.
3535
 
        clients = {}
3536
 
        with PGPEngine() as pgp:
3537
 
            for client in tcp_server.clients.values():
3538
 
                key = client_settings[client.name]["secret"]
3539
 
                client.encrypted_secret = pgp.encrypt(client.secret,
3540
 
                                                      key)
3541
 
                client_dict = {}
3542
 
 
3543
 
                # A list of attributes that can not be pickled
3544
 
                # + secret.
3545
 
                exclude = {"bus", "changedstate", "secret",
3546
 
                           "checker", "server_settings"}
3547
 
                for name, typ in inspect.getmembers(dbus.service
3548
 
                                                    .Object):
3549
 
                    exclude.add(name)
3550
 
 
3551
 
                client_dict["encrypted_secret"] = (client
3552
 
                                                   .encrypted_secret)
3553
 
                for attr in client.client_structure:
3554
 
                    if attr not in exclude:
3555
 
                        client_dict[attr] = getattr(client, attr)
3556
 
 
3557
 
                clients[client.name] = client_dict
3558
 
                del client_settings[client.name]["secret"]
3559
 
 
3560
 
        try:
3561
 
            with tempfile.NamedTemporaryFile(
3562
 
                    mode='wb',
3563
 
                    suffix=".pickle",
3564
 
                    prefix='clients-',
3565
 
                    dir=os.path.dirname(stored_state_path),
3566
 
                    delete=False) as stored_state:
3567
 
                pickle.dump((clients, client_settings), stored_state,
3568
 
                            protocol=2)
3569
 
                tempname = stored_state.name
3570
 
            os.rename(tempname, stored_state_path)
3571
 
        except (IOError, OSError) as e:
3572
 
            if not debug:
3573
 
                try:
3574
 
                    os.remove(tempname)
3575
 
                except NameError:
3576
 
                    pass
3577
 
            if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
3578
 
                logger.warning("Could not save persistent state: {}"
3579
 
                               .format(os.strerror(e.errno)))
3580
 
            else:
3581
 
                logger.warning("Could not save persistent state:",
3582
 
                               exc_info=e)
3583
 
                raise
3584
 
 
3585
 
        # Delete all clients, and settings from config
3586
 
        while tcp_server.clients:
3587
 
            name, client = tcp_server.clients.popitem()
3588
 
            if use_dbus:
3589
 
                client.remove_from_connection()
3590
 
            # Don't signal the disabling
3591
 
            client.disable(quiet=True)
3592
 
            # Emit D-Bus signal for removal
3593
 
            if use_dbus:
3594
 
                mandos_dbus_service.client_removed_signal(client)
3595
 
        client_settings.clear()
3596
 
 
 
769
        global group
 
770
        # From the Avahi example code
 
771
        if not group is None:
 
772
            group.Free()
 
773
            group = None
 
774
        # End of Avahi example code
 
775
        
 
776
        while clients:
 
777
            client = clients.pop()
 
778
            client.stop_hook = None
 
779
            client.stop()
 
780
    
3597
781
    atexit.register(cleanup)
3598
 
 
3599
 
    for client in tcp_server.clients.values():
3600
 
        if use_dbus:
3601
 
            # Emit D-Bus signal for adding
3602
 
            mandos_dbus_service.client_added_signal(client)
3603
 
        # Need to initiate checking of clients
3604
 
        if client.enabled:
3605
 
            client.init_checker()
3606
 
 
3607
 
    tcp_server.enable()
3608
 
    tcp_server.server_activate()
3609
 
 
 
782
    
 
783
    if not debug:
 
784
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
785
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
786
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
787
    
 
788
    for client in clients:
 
789
        client.start()
 
790
    
 
791
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
792
                                 server_settings["port"]),
 
793
                                tcp_handler,
 
794
                                settings=server_settings,
 
795
                                clients=clients)
3610
796
    # Find out what port we got
3611
 
    if zeroconf:
3612
 
        service.port = tcp_server.socket.getsockname()[1]
3613
 
    if use_ipv6:
3614
 
        logger.info("Now listening on address %r, port %d,"
3615
 
                    " flowinfo %d, scope_id %d",
3616
 
                    *tcp_server.socket.getsockname())
3617
 
    else:                       # IPv4
3618
 
        logger.info("Now listening on address %r, port %d",
3619
 
                    *tcp_server.socket.getsockname())
3620
 
 
3621
 
    # service.interface = tcp_server.socket.getsockname()[3]
3622
 
 
 
797
    service.port = tcp_server.socket.getsockname()[1]
 
798
    logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
 
799
                 u" scope_id %d" % tcp_server.socket.getsockname())
 
800
    
 
801
    #service.interface = tcp_server.socket.getsockname()[3]
 
802
    
3623
803
    try:
3624
 
        if zeroconf:
3625
 
            # From the Avahi example code
3626
 
            try:
3627
 
                service.activate()
3628
 
            except dbus.exceptions.DBusException as error:
3629
 
                logger.critical("D-Bus Exception", exc_info=error)
3630
 
                cleanup()
3631
 
                sys.exit(1)
3632
 
            # End of Avahi example code
3633
 
 
3634
 
        GLib.io_add_watch(
3635
 
            GLib.IOChannel.unix_new(tcp_server.fileno()),
3636
 
            GLib.PRIORITY_DEFAULT, GLib.IO_IN,
3637
 
            lambda *args, **kwargs: (tcp_server.handle_request
3638
 
                                     (*args[2:], **kwargs) or True))
3639
 
 
 
804
        # From the Avahi example code
 
805
        server.connect_to_signal("StateChanged", server_state_changed)
 
806
        try:
 
807
            server_state_changed(server.GetState())
 
808
        except dbus.exceptions.DBusException, error:
 
809
            logger.critical(u"DBusException: %s", error)
 
810
            sys.exit(1)
 
811
        # End of Avahi example code
 
812
        
 
813
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
814
                             lambda *args, **kwargs:
 
815
                             tcp_server.handle_request\
 
816
                             (*args[2:], **kwargs) or True)
 
817
        
3640
818
        logger.debug("Starting main loop")
 
819
        main_loop_started = True
3641
820
        main_loop.run()
3642
 
    except AvahiError as error:
3643
 
        logger.critical("Avahi Error", exc_info=error)
3644
 
        cleanup()
 
821
    except AvahiError, error:
 
822
        logger.critical(u"AvahiError: %s" + unicode(error))
3645
823
        sys.exit(1)
3646
824
    except KeyboardInterrupt:
3647
825
        if debug:
3648
 
            print("", file=sys.stderr)
3649
 
        logger.debug("Server received KeyboardInterrupt")
3650
 
    logger.debug("Server exiting")
3651
 
    # Must run before the D-Bus bus name gets deregistered
3652
 
    cleanup()
3653
 
 
3654
 
 
3655
 
def should_only_run_tests():
3656
 
    parser = argparse.ArgumentParser(add_help=False)
3657
 
    parser.add_argument("--check", action='store_true')
3658
 
    args, unknown_args = parser.parse_known_args()
3659
 
    run_tests = args.check
3660
 
    if run_tests:
3661
 
        # Remove --check argument from sys.argv
3662
 
        sys.argv[1:] = unknown_args
3663
 
    return run_tests
3664
 
 
3665
 
# Add all tests from doctest strings
3666
 
def load_tests(loader, tests, none):
3667
 
    import doctest
3668
 
    tests.addTests(doctest.DocTestSuite())
3669
 
    return tests
 
826
            print
3670
827
 
3671
828
if __name__ == '__main__':
3672
 
    try:
3673
 
        if should_only_run_tests():
3674
 
            # Call using ./mandos --check [--verbose]
3675
 
            unittest.main()
3676
 
        else:
3677
 
            main()
3678
 
    finally:
3679
 
        logging.shutdown()
 
829
    main()