/mandos/release

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  • Committer: Teddy Hogeborn
  • Date: 2018-08-19 14:06:55 UTC
  • mto: (237.7.594 trunk)
  • mto: This revision was merged to the branch mainline in revision 368.
  • Revision ID: teddy@recompile.se-20180819140655-ghsl0d4jsx8xwg44
Move UMASK setting to more proper place

* Makefile (install-client-nokey): Also install new conf files
  "initramfs-tools-conf".
* debian/mandos-client.dirs: Add "usr/share/initramfs-tools/conf.d".
* initramfs-tools-conf: New file which sets UMASK.
* initramfs-tools-hook: Change comment to correctly state new location
  of UMASK setting.
* initramfs-tools-hook-conf: Remove UMASK setting.

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Lines of Context:
mandos
1
1
#!/usr/bin/python
2
2
# -*- mode: python; coding: utf-8 -*-
3
 
# 
 
3
#
4
4
# Mandos server - give out binary blobs to connecting clients.
5
 
# 
 
5
#
6
6
# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add" and "remove" in the "AvahiService" class, the
10
 
# "server_state_changed" and "entry_group_state_changed" functions,
11
 
# and some lines in "main".
12
 
# 
 
9
# methods "add", "remove", "server_state_changed",
 
10
# "entry_group_state_changed", "cleanup", and "activate" in the
 
11
# "AvahiService" class, and some lines in "main".
 
12
#
13
13
# Everything else is
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
 
14
# Copyright © 2008-2018 Teddy Hogeborn
 
15
# Copyright © 2008-2018 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
18
21
# the Free Software Foundation, either version 3 of the License, or
19
22
# (at your option) any later version.
20
23
#
21
 
#     This program is distributed in the hope that it will be useful,
22
 
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
 
24
#     Mandos is distributed in the hope that it will be useful, but
 
25
#     WITHOUT ANY WARRANTY; without even the implied warranty of
23
26
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24
27
#     GNU General Public License for more details.
25
 
# 
 
28
#
26
29
# You should have received a copy of the GNU General Public License
27
 
# along with this program.  If not, see
28
 
# <http://www.gnu.org/licenses/>.
29
 
# 
30
 
# Contact the authors at <mandos@fukt.bsnet.se>.
31
 
# 
32
 
 
33
 
from __future__ import division
34
 
 
35
 
import SocketServer
 
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
36
47
import socket
37
 
import select
38
 
from optparse import OptionParser
 
48
import argparse
39
49
import datetime
40
50
import errno
41
 
import gnutls.crypto
42
 
import gnutls.connection
43
 
import gnutls.errors
44
 
import gnutls.library.functions
45
 
import gnutls.library.constants
46
 
import gnutls.library.types
47
 
import ConfigParser
 
51
try:
 
52
    import ConfigParser as configparser
 
53
except ImportError:
 
54
    import configparser
48
55
import sys
49
56
import re
50
57
import os
51
58
import signal
52
 
from sets import Set
53
59
import subprocess
54
60
import atexit
55
61
import stat
56
62
import logging
57
63
import logging.handlers
 
64
import pwd
 
65
import contextlib
 
66
import struct
 
67
import fcntl
 
68
import functools
 
69
try:
 
70
    import cPickle as pickle
 
71
except ImportError:
 
72
    import pickle
 
73
import multiprocessing
 
74
import types
 
75
import binascii
 
76
import tempfile
 
77
import itertools
 
78
import collections
 
79
import codecs
58
80
 
59
81
import dbus
60
 
import gobject
61
 
import avahi
 
82
import dbus.service
 
83
from gi.repository import GLib
62
84
from dbus.mainloop.glib import DBusGMainLoop
63
85
import ctypes
64
 
 
65
 
version = "1.0"
66
 
 
67
 
logger = logging.Logger('mandos')
68
 
syslogger = logging.handlers.SysLogHandler\
69
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
70
 
             address = "/dev/log")
71
 
syslogger.setFormatter(logging.Formatter\
72
 
                        ('Mandos: %(levelname)s: %(message)s'))
73
 
logger.addHandler(syslogger)
74
 
 
75
 
console = logging.StreamHandler()
76
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
77
 
                                       ' %(message)s'))
78
 
logger.addHandler(console)
 
86
import ctypes.util
 
87
import xml.dom.minidom
 
88
import inspect
 
89
 
 
90
# Try to find the value of SO_BINDTODEVICE:
 
91
try:
 
92
    # This is where SO_BINDTODEVICE is in Python 3.3 (or 3.4?) and
 
93
    # newer, and it is also the most natural place for it:
 
94
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
 
95
except AttributeError:
 
96
    try:
 
97
        # This is where SO_BINDTODEVICE was up to and including Python
 
98
        # 2.6, and also 3.2:
 
99
        from IN import SO_BINDTODEVICE
 
100
    except ImportError:
 
101
        # In Python 2.7 it seems to have been removed entirely.
 
102
        # Try running the C preprocessor:
 
103
        try:
 
104
            cc = subprocess.Popen(["cc", "--language=c", "-E",
 
105
                                   "/dev/stdin"],
 
106
                                  stdin=subprocess.PIPE,
 
107
                                  stdout=subprocess.PIPE)
 
108
            stdout = cc.communicate(
 
109
                "#include <sys/socket.h>\nSO_BINDTODEVICE\n")[0]
 
110
            SO_BINDTODEVICE = int(stdout.splitlines()[-1])
 
111
        except (OSError, ValueError, IndexError):
 
112
            # No value found
 
113
            SO_BINDTODEVICE = None
 
114
 
 
115
if sys.version_info.major == 2:
 
116
    str = unicode
 
117
 
 
118
version = "1.7.19"
 
119
stored_state_file = "clients.pickle"
 
120
 
 
121
logger = logging.getLogger()
 
122
syslogger = None
 
123
 
 
124
try:
 
125
    if_nametoindex = ctypes.cdll.LoadLibrary(
 
126
        ctypes.util.find_library("c")).if_nametoindex
 
127
except (OSError, AttributeError):
 
128
 
 
129
    def if_nametoindex(interface):
 
130
        "Get an interface index the hard way, i.e. using fcntl()"
 
131
        SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
132
        with contextlib.closing(socket.socket()) as s:
 
133
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
134
                                struct.pack(b"16s16x", interface))
 
135
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
136
        return interface_index
 
137
 
 
138
 
 
139
def copy_function(func):
 
140
    """Make a copy of a function"""
 
141
    if sys.version_info.major == 2:
 
142
        return types.FunctionType(func.func_code,
 
143
                                  func.func_globals,
 
144
                                  func.func_name,
 
145
                                  func.func_defaults,
 
146
                                  func.func_closure)
 
147
    else:
 
148
        return types.FunctionType(func.__code__,
 
149
                                  func.__globals__,
 
150
                                  func.__name__,
 
151
                                  func.__defaults__,
 
152
                                  func.__closure__)
 
153
 
 
154
 
 
155
def initlogger(debug, level=logging.WARNING):
 
156
    """init logger and add loglevel"""
 
157
 
 
158
    global syslogger
 
159
    syslogger = (logging.handlers.SysLogHandler(
 
160
        facility=logging.handlers.SysLogHandler.LOG_DAEMON,
 
161
        address="/dev/log"))
 
162
    syslogger.setFormatter(logging.Formatter
 
163
                           ('Mandos [%(process)d]: %(levelname)s:'
 
164
                            ' %(message)s'))
 
165
    logger.addHandler(syslogger)
 
166
 
 
167
    if debug:
 
168
        console = logging.StreamHandler()
 
169
        console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
 
170
                                               ' [%(process)d]:'
 
171
                                               ' %(levelname)s:'
 
172
                                               ' %(message)s'))
 
173
        logger.addHandler(console)
 
174
    logger.setLevel(level)
 
175
 
 
176
 
 
177
class PGPError(Exception):
 
178
    """Exception if encryption/decryption fails"""
 
179
    pass
 
180
 
 
181
 
 
182
class PGPEngine(object):
 
183
    """A simple class for OpenPGP symmetric encryption & decryption"""
 
184
 
 
185
    def __init__(self):
 
186
        self.tempdir = tempfile.mkdtemp(prefix="mandos-")
 
187
        self.gpg = "gpg"
 
188
        try:
 
189
            output = subprocess.check_output(["gpgconf"])
 
190
            for line in output.splitlines():
 
191
                name, text, path = line.split(b":")
 
192
                if name == "gpg":
 
193
                    self.gpg = path
 
194
                    break
 
195
        except OSError as e:
 
196
            if e.errno != errno.ENOENT:
 
197
                raise
 
198
        self.gnupgargs = ['--batch',
 
199
                          '--homedir', self.tempdir,
 
200
                          '--force-mdc',
 
201
                          '--quiet']
 
202
        # Only GPG version 1 has the --no-use-agent option.
 
203
        if self.gpg == "gpg" or self.gpg.endswith("/gpg"):
 
204
            self.gnupgargs.append("--no-use-agent")
 
205
 
 
206
    def __enter__(self):
 
207
        return self
 
208
 
 
209
    def __exit__(self, exc_type, exc_value, traceback):
 
210
        self._cleanup()
 
211
        return False
 
212
 
 
213
    def __del__(self):
 
214
        self._cleanup()
 
215
 
 
216
    def _cleanup(self):
 
217
        if self.tempdir is not None:
 
218
            # Delete contents of tempdir
 
219
            for root, dirs, files in os.walk(self.tempdir,
 
220
                                             topdown=False):
 
221
                for filename in files:
 
222
                    os.remove(os.path.join(root, filename))
 
223
                for dirname in dirs:
 
224
                    os.rmdir(os.path.join(root, dirname))
 
225
            # Remove tempdir
 
226
            os.rmdir(self.tempdir)
 
227
            self.tempdir = None
 
228
 
 
229
    def password_encode(self, password):
 
230
        # Passphrase can not be empty and can not contain newlines or
 
231
        # NUL bytes.  So we prefix it and hex encode it.
 
232
        encoded = b"mandos" + binascii.hexlify(password)
 
233
        if len(encoded) > 2048:
 
234
            # GnuPG can't handle long passwords, so encode differently
 
235
            encoded = (b"mandos" + password.replace(b"\\", b"\\\\")
 
236
                       .replace(b"\n", b"\\n")
 
237
                       .replace(b"\0", b"\\x00"))
 
238
        return encoded
 
239
 
 
240
    def encrypt(self, data, password):
 
241
        passphrase = self.password_encode(password)
 
242
        with tempfile.NamedTemporaryFile(
 
243
                dir=self.tempdir) as passfile:
 
244
            passfile.write(passphrase)
 
245
            passfile.flush()
 
246
            proc = subprocess.Popen([self.gpg, '--symmetric',
 
247
                                     '--passphrase-file',
 
248
                                     passfile.name]
 
249
                                    + self.gnupgargs,
 
250
                                    stdin=subprocess.PIPE,
 
251
                                    stdout=subprocess.PIPE,
 
252
                                    stderr=subprocess.PIPE)
 
253
            ciphertext, err = proc.communicate(input=data)
 
254
        if proc.returncode != 0:
 
255
            raise PGPError(err)
 
256
        return ciphertext
 
257
 
 
258
    def decrypt(self, data, password):
 
259
        passphrase = self.password_encode(password)
 
260
        with tempfile.NamedTemporaryFile(
 
261
                dir=self.tempdir) as passfile:
 
262
            passfile.write(passphrase)
 
263
            passfile.flush()
 
264
            proc = subprocess.Popen([self.gpg, '--decrypt',
 
265
                                     '--passphrase-file',
 
266
                                     passfile.name]
 
267
                                    + self.gnupgargs,
 
268
                                    stdin=subprocess.PIPE,
 
269
                                    stdout=subprocess.PIPE,
 
270
                                    stderr=subprocess.PIPE)
 
271
            decrypted_plaintext, err = proc.communicate(input=data)
 
272
        if proc.returncode != 0:
 
273
            raise PGPError(err)
 
274
        return decrypted_plaintext
 
275
 
 
276
 
 
277
# Pretend that we have an Avahi module
 
278
class Avahi(object):
 
279
    """This isn't so much a class as it is a module-like namespace.
 
280
    It is instantiated once, and simulates having an Avahi module."""
 
281
    IF_UNSPEC = -1               # avahi-common/address.h
 
282
    PROTO_UNSPEC = -1            # avahi-common/address.h
 
283
    PROTO_INET = 0               # avahi-common/address.h
 
284
    PROTO_INET6 = 1              # avahi-common/address.h
 
285
    DBUS_NAME = "org.freedesktop.Avahi"
 
286
    DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"
 
287
    DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"
 
288
    DBUS_PATH_SERVER = "/"
 
289
 
 
290
    def string_array_to_txt_array(self, t):
 
291
        return dbus.Array((dbus.ByteArray(s.encode("utf-8"))
 
292
                           for s in t), signature="ay")
 
293
    ENTRY_GROUP_ESTABLISHED = 2  # avahi-common/defs.h
 
294
    ENTRY_GROUP_COLLISION = 3    # avahi-common/defs.h
 
295
    ENTRY_GROUP_FAILURE = 4      # avahi-common/defs.h
 
296
    SERVER_INVALID = 0           # avahi-common/defs.h
 
297
    SERVER_REGISTERING = 1       # avahi-common/defs.h
 
298
    SERVER_RUNNING = 2           # avahi-common/defs.h
 
299
    SERVER_COLLISION = 3         # avahi-common/defs.h
 
300
    SERVER_FAILURE = 4           # avahi-common/defs.h
 
301
avahi = Avahi()
 
302
 
79
303
 
80
304
class AvahiError(Exception):
81
 
    def __init__(self, value):
 
305
    def __init__(self, value, *args, **kwargs):
82
306
        self.value = value
83
 
    def __str__(self):
84
 
        return repr(self.value)
 
307
        return super(AvahiError, self).__init__(value, *args,
 
308
                                                **kwargs)
 
309
 
85
310
 
86
311
class AvahiServiceError(AvahiError):
87
312
    pass
88
313
 
 
314
 
89
315
class AvahiGroupError(AvahiError):
90
316
    pass
91
317
 
92
318
 
93
319
class AvahiService(object):
94
320
    """An Avahi (Zeroconf) service.
 
321
 
95
322
    Attributes:
96
323
    interface: integer; avahi.IF_UNSPEC or an interface index.
97
324
               Used to optionally bind to the specified interface.
98
325
    name: string; Example: 'Mandos'
99
326
    type: string; Example: '_mandos._tcp'.
100
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
 
327
     See <https://www.iana.org/assignments/service-names-port-numbers>
101
328
    port: integer; what port to announce
102
329
    TXT: list of strings; TXT record for the service
103
330
    domain: string; Domain to publish on, default to .local if empty.
105
332
    max_renames: integer; maximum number of renames
106
333
    rename_count: integer; counter so we only rename after collisions
107
334
                  a sensible number of times
 
335
    group: D-Bus Entry Group
 
336
    server: D-Bus Server
 
337
    bus: dbus.SystemBus()
108
338
    """
109
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
110
 
                 type = None, port = None, TXT = None, domain = "",
111
 
                 host = "", max_renames = 32768):
 
339
 
 
340
    def __init__(self,
 
341
                 interface=avahi.IF_UNSPEC,
 
342
                 name=None,
 
343
                 servicetype=None,
 
344
                 port=None,
 
345
                 TXT=None,
 
346
                 domain="",
 
347
                 host="",
 
348
                 max_renames=32768,
 
349
                 protocol=avahi.PROTO_UNSPEC,
 
350
                 bus=None):
112
351
        self.interface = interface
113
352
        self.name = name
114
 
        self.type = type
 
353
        self.type = servicetype
115
354
        self.port = port
116
 
        if TXT is None:
117
 
            self.TXT = []
118
 
        else:
119
 
            self.TXT = TXT
 
355
        self.TXT = TXT if TXT is not None else []
120
356
        self.domain = domain
121
357
        self.host = host
122
358
        self.rename_count = 0
123
359
        self.max_renames = max_renames
124
 
    def rename(self):
 
360
        self.protocol = protocol
 
361
        self.group = None       # our entry group
 
362
        self.server = None
 
363
        self.bus = bus
 
364
        self.entry_group_state_changed_match = None
 
365
 
 
366
    def rename(self, remove=True):
125
367
        """Derived from the Avahi example code"""
126
368
        if self.rename_count >= self.max_renames:
127
 
            logger.critical(u"No suitable Zeroconf service name found"
128
 
                            u" after %i retries, exiting.",
129
 
                            rename_count)
 
369
            logger.critical("No suitable Zeroconf service name found"
 
370
                            " after %i retries, exiting.",
 
371
                            self.rename_count)
130
372
            raise AvahiServiceError("Too many renames")
131
 
        self.name = server.GetAlternativeServiceName(self.name)
132
 
        logger.info(u"Changing Zeroconf service name to %r ...",
133
 
                    str(self.name))
134
 
        syslogger.setFormatter(logging.Formatter\
135
 
                               ('Mandos (%s): %%(levelname)s:'
136
 
                               ' %%(message)s' % self.name))
137
 
        self.remove()
138
 
        self.add()
 
373
        self.name = str(
 
374
            self.server.GetAlternativeServiceName(self.name))
139
375
        self.rename_count += 1
 
376
        logger.info("Changing Zeroconf service name to %r ...",
 
377
                    self.name)
 
378
        if remove:
 
379
            self.remove()
 
380
        try:
 
381
            self.add()
 
382
        except dbus.exceptions.DBusException as error:
 
383
            if (error.get_dbus_name()
 
384
                == "org.freedesktop.Avahi.CollisionError"):
 
385
                logger.info("Local Zeroconf service name collision.")
 
386
                return self.rename(remove=False)
 
387
            else:
 
388
                logger.critical("D-Bus Exception", exc_info=error)
 
389
                self.cleanup()
 
390
                os._exit(1)
 
391
 
140
392
    def remove(self):
141
393
        """Derived from the Avahi example code"""
142
 
        if group is not None:
143
 
            group.Reset()
 
394
        if self.entry_group_state_changed_match is not None:
 
395
            self.entry_group_state_changed_match.remove()
 
396
            self.entry_group_state_changed_match = None
 
397
        if self.group is not None:
 
398
            self.group.Reset()
 
399
 
144
400
    def add(self):
145
401
        """Derived from the Avahi example code"""
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 Zeroconf 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
 
402
        self.remove()
 
403
        if self.group is None:
 
404
            self.group = dbus.Interface(
 
405
                self.bus.get_object(avahi.DBUS_NAME,
 
406
                                    self.server.EntryGroupNew()),
 
407
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
408
        self.entry_group_state_changed_match = (
 
409
            self.group.connect_to_signal(
 
410
                'StateChanged', self.entry_group_state_changed))
 
411
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
 
412
                     self.name, self.type)
 
413
        self.group.AddService(
 
414
            self.interface,
 
415
            self.protocol,
 
416
            dbus.UInt32(0),     # flags
 
417
            self.name, self.type,
 
418
            self.domain, self.host,
 
419
            dbus.UInt16(self.port),
 
420
            avahi.string_array_to_txt_array(self.TXT))
 
421
        self.group.Commit()
 
422
 
 
423
    def entry_group_state_changed(self, state, error):
 
424
        """Derived from the Avahi example code"""
 
425
        logger.debug("Avahi entry group state change: %i", state)
 
426
 
 
427
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
428
            logger.debug("Zeroconf service established.")
 
429
        elif state == avahi.ENTRY_GROUP_COLLISION:
 
430
            logger.info("Zeroconf service name collision.")
 
431
            self.rename()
 
432
        elif state == avahi.ENTRY_GROUP_FAILURE:
 
433
            logger.critical("Avahi: Error in group state changed %s",
 
434
                            str(error))
 
435
            raise AvahiGroupError("State changed: {!s}".format(error))
 
436
 
 
437
    def cleanup(self):
 
438
        """Derived from the Avahi example code"""
 
439
        if self.group is not None:
 
440
            try:
 
441
                self.group.Free()
 
442
            except (dbus.exceptions.UnknownMethodException,
 
443
                    dbus.exceptions.DBusException):
 
444
                pass
 
445
            self.group = None
 
446
        self.remove()
 
447
 
 
448
    def server_state_changed(self, state, error=None):
 
449
        """Derived from the Avahi example code"""
 
450
        logger.debug("Avahi server state change: %i", state)
 
451
        bad_states = {
 
452
            avahi.SERVER_INVALID: "Zeroconf server invalid",
 
453
            avahi.SERVER_REGISTERING: None,
 
454
            avahi.SERVER_COLLISION: "Zeroconf server name collision",
 
455
            avahi.SERVER_FAILURE: "Zeroconf server failure",
 
456
        }
 
457
        if state in bad_states:
 
458
            if bad_states[state] is not None:
 
459
                if error is None:
 
460
                    logger.error(bad_states[state])
 
461
                else:
 
462
                    logger.error(bad_states[state] + ": %r", error)
 
463
            self.cleanup()
 
464
        elif state == avahi.SERVER_RUNNING:
 
465
            try:
 
466
                self.add()
 
467
            except dbus.exceptions.DBusException as error:
 
468
                if (error.get_dbus_name()
 
469
                    == "org.freedesktop.Avahi.CollisionError"):
 
470
                    logger.info("Local Zeroconf service name"
 
471
                                " collision.")
 
472
                    return self.rename(remove=False)
 
473
                else:
 
474
                    logger.critical("D-Bus Exception", exc_info=error)
 
475
                    self.cleanup()
 
476
                    os._exit(1)
 
477
        else:
 
478
            if error is None:
 
479
                logger.debug("Unknown state: %r", state)
 
480
            else:
 
481
                logger.debug("Unknown state: %r: %r", state, error)
 
482
 
 
483
    def activate(self):
 
484
        """Derived from the Avahi example code"""
 
485
        if self.server is None:
 
486
            self.server = dbus.Interface(
 
487
                self.bus.get_object(avahi.DBUS_NAME,
 
488
                                    avahi.DBUS_PATH_SERVER,
 
489
                                    follow_name_owner_changes=True),
 
490
                avahi.DBUS_INTERFACE_SERVER)
 
491
        self.server.connect_to_signal("StateChanged",
 
492
                                      self.server_state_changed)
 
493
        self.server_state_changed(self.server.GetState())
 
494
 
 
495
 
 
496
class AvahiServiceToSyslog(AvahiService):
 
497
    def rename(self, *args, **kwargs):
 
498
        """Add the new name to the syslog messages"""
 
499
        ret = super(AvahiServiceToSyslog, self).rename(*args, **kwargs)
 
500
        syslogger.setFormatter(logging.Formatter(
 
501
            'Mandos ({}) [%(process)d]: %(levelname)s: %(message)s'
 
502
            .format(self.name)))
 
503
        return ret
 
504
 
 
505
 
 
506
# Pretend that we have a GnuTLS module
 
507
class GnuTLS(object):
 
508
    """This isn't so much a class as it is a module-like namespace.
 
509
    It is instantiated once, and simulates having a GnuTLS module."""
 
510
 
 
511
    library = ctypes.util.find_library("gnutls")
 
512
    if library is None:
 
513
        library = ctypes.util.find_library("gnutls-deb0")
 
514
    _library = ctypes.cdll.LoadLibrary(library)
 
515
    del library
 
516
    _need_version = b"3.3.0"
 
517
 
 
518
    def __init__(self):
 
519
        # Need to use "self" here, since this method is called before
 
520
        # the assignment to the "gnutls" global variable happens.
 
521
        if self.check_version(self._need_version) is None:
 
522
            raise self.Error("Needs GnuTLS {} or later"
 
523
                             .format(self._need_version))
 
524
 
 
525
    # Unless otherwise indicated, the constants and types below are
 
526
    # all from the gnutls/gnutls.h C header file.
 
527
 
 
528
    # Constants
 
529
    E_SUCCESS = 0
 
530
    E_INTERRUPTED = -52
 
531
    E_AGAIN = -28
 
532
    CRT_OPENPGP = 2
 
533
    CLIENT = 2
 
534
    SHUT_RDWR = 0
 
535
    CRD_CERTIFICATE = 1
 
536
    E_NO_CERTIFICATE_FOUND = -49
 
537
    OPENPGP_FMT_RAW = 0         # gnutls/openpgp.h
 
538
 
 
539
    # Types
 
540
    class session_int(ctypes.Structure):
 
541
        _fields_ = []
 
542
    session_t = ctypes.POINTER(session_int)
 
543
 
 
544
    class certificate_credentials_st(ctypes.Structure):
 
545
        _fields_ = []
 
546
    certificate_credentials_t = ctypes.POINTER(
 
547
        certificate_credentials_st)
 
548
    certificate_type_t = ctypes.c_int
 
549
 
 
550
    class datum_t(ctypes.Structure):
 
551
        _fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),
 
552
                    ('size', ctypes.c_uint)]
 
553
 
 
554
    class openpgp_crt_int(ctypes.Structure):
 
555
        _fields_ = []
 
556
    openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)
 
557
    openpgp_crt_fmt_t = ctypes.c_int  # gnutls/openpgp.h
 
558
    log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)
 
559
    credentials_type_t = ctypes.c_int
 
560
    transport_ptr_t = ctypes.c_void_p
 
561
    close_request_t = ctypes.c_int
 
562
 
 
563
    # Exceptions
 
564
    class Error(Exception):
 
565
        # We need to use the class name "GnuTLS" here, since this
 
566
        # exception might be raised from within GnuTLS.__init__,
 
567
        # which is called before the assignment to the "gnutls"
 
568
        # global variable has happened.
 
569
        def __init__(self, message=None, code=None, args=()):
 
570
            # Default usage is by a message string, but if a return
 
571
            # code is passed, convert it to a string with
 
572
            # gnutls.strerror()
 
573
            self.code = code
 
574
            if message is None and code is not None:
 
575
                message = GnuTLS.strerror(code)
 
576
            return super(GnuTLS.Error, self).__init__(
 
577
                message, *args)
 
578
 
 
579
    class CertificateSecurityError(Error):
 
580
        pass
 
581
 
 
582
    # Classes
 
583
    class Credentials(object):
 
584
        def __init__(self):
 
585
            self._c_object = gnutls.certificate_credentials_t()
 
586
            gnutls.certificate_allocate_credentials(
 
587
                ctypes.byref(self._c_object))
 
588
            self.type = gnutls.CRD_CERTIFICATE
 
589
 
 
590
        def __del__(self):
 
591
            gnutls.certificate_free_credentials(self._c_object)
 
592
 
 
593
    class ClientSession(object):
 
594
        def __init__(self, socket, credentials=None):
 
595
            self._c_object = gnutls.session_t()
 
596
            gnutls.init(ctypes.byref(self._c_object), gnutls.CLIENT)
 
597
            gnutls.set_default_priority(self._c_object)
 
598
            gnutls.transport_set_ptr(self._c_object, socket.fileno())
 
599
            gnutls.handshake_set_private_extensions(self._c_object,
 
600
                                                    True)
 
601
            self.socket = socket
 
602
            if credentials is None:
 
603
                credentials = gnutls.Credentials()
 
604
            gnutls.credentials_set(self._c_object, credentials.type,
 
605
                                   ctypes.cast(credentials._c_object,
 
606
                                               ctypes.c_void_p))
 
607
            self.credentials = credentials
 
608
 
 
609
        def __del__(self):
 
610
            gnutls.deinit(self._c_object)
 
611
 
 
612
        def handshake(self):
 
613
            return gnutls.handshake(self._c_object)
 
614
 
 
615
        def send(self, data):
 
616
            data = bytes(data)
 
617
            data_len = len(data)
 
618
            while data_len > 0:
 
619
                data_len -= gnutls.record_send(self._c_object,
 
620
                                               data[-data_len:],
 
621
                                               data_len)
 
622
 
 
623
        def bye(self):
 
624
            return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)
 
625
 
 
626
    # Error handling functions
 
627
    def _error_code(result):
 
628
        """A function to raise exceptions on errors, suitable
 
629
        for the 'restype' attribute on ctypes functions"""
 
630
        if result >= 0:
 
631
            return result
 
632
        if result == gnutls.E_NO_CERTIFICATE_FOUND:
 
633
            raise gnutls.CertificateSecurityError(code=result)
 
634
        raise gnutls.Error(code=result)
 
635
 
 
636
    def _retry_on_error(result, func, arguments):
 
637
        """A function to retry on some errors, suitable
 
638
        for the 'errcheck' attribute on ctypes functions"""
 
639
        while result < 0:
 
640
            if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):
 
641
                return _error_code(result)
 
642
            result = func(*arguments)
 
643
        return result
 
644
 
 
645
    # Unless otherwise indicated, the function declarations below are
 
646
    # all from the gnutls/gnutls.h C header file.
 
647
 
 
648
    # Functions
 
649
    priority_set_direct = _library.gnutls_priority_set_direct
 
650
    priority_set_direct.argtypes = [session_t, ctypes.c_char_p,
 
651
                                    ctypes.POINTER(ctypes.c_char_p)]
 
652
    priority_set_direct.restype = _error_code
 
653
 
 
654
    init = _library.gnutls_init
 
655
    init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]
 
656
    init.restype = _error_code
 
657
 
 
658
    set_default_priority = _library.gnutls_set_default_priority
 
659
    set_default_priority.argtypes = [session_t]
 
660
    set_default_priority.restype = _error_code
 
661
 
 
662
    record_send = _library.gnutls_record_send
 
663
    record_send.argtypes = [session_t, ctypes.c_void_p,
 
664
                            ctypes.c_size_t]
 
665
    record_send.restype = ctypes.c_ssize_t
 
666
    record_send.errcheck = _retry_on_error
 
667
 
 
668
    certificate_allocate_credentials = (
 
669
        _library.gnutls_certificate_allocate_credentials)
 
670
    certificate_allocate_credentials.argtypes = [
 
671
        ctypes.POINTER(certificate_credentials_t)]
 
672
    certificate_allocate_credentials.restype = _error_code
 
673
 
 
674
    certificate_free_credentials = (
 
675
        _library.gnutls_certificate_free_credentials)
 
676
    certificate_free_credentials.argtypes = [
 
677
        certificate_credentials_t]
 
678
    certificate_free_credentials.restype = None
 
679
 
 
680
    handshake_set_private_extensions = (
 
681
        _library.gnutls_handshake_set_private_extensions)
 
682
    handshake_set_private_extensions.argtypes = [session_t,
 
683
                                                 ctypes.c_int]
 
684
    handshake_set_private_extensions.restype = None
 
685
 
 
686
    credentials_set = _library.gnutls_credentials_set
 
687
    credentials_set.argtypes = [session_t, credentials_type_t,
 
688
                                ctypes.c_void_p]
 
689
    credentials_set.restype = _error_code
 
690
 
 
691
    strerror = _library.gnutls_strerror
 
692
    strerror.argtypes = [ctypes.c_int]
 
693
    strerror.restype = ctypes.c_char_p
 
694
 
 
695
    certificate_type_get = _library.gnutls_certificate_type_get
 
696
    certificate_type_get.argtypes = [session_t]
 
697
    certificate_type_get.restype = _error_code
 
698
 
 
699
    certificate_get_peers = _library.gnutls_certificate_get_peers
 
700
    certificate_get_peers.argtypes = [session_t,
 
701
                                      ctypes.POINTER(ctypes.c_uint)]
 
702
    certificate_get_peers.restype = ctypes.POINTER(datum_t)
 
703
 
 
704
    global_set_log_level = _library.gnutls_global_set_log_level
 
705
    global_set_log_level.argtypes = [ctypes.c_int]
 
706
    global_set_log_level.restype = None
 
707
 
 
708
    global_set_log_function = _library.gnutls_global_set_log_function
 
709
    global_set_log_function.argtypes = [log_func]
 
710
    global_set_log_function.restype = None
 
711
 
 
712
    deinit = _library.gnutls_deinit
 
713
    deinit.argtypes = [session_t]
 
714
    deinit.restype = None
 
715
 
 
716
    handshake = _library.gnutls_handshake
 
717
    handshake.argtypes = [session_t]
 
718
    handshake.restype = _error_code
 
719
    handshake.errcheck = _retry_on_error
 
720
 
 
721
    transport_set_ptr = _library.gnutls_transport_set_ptr
 
722
    transport_set_ptr.argtypes = [session_t, transport_ptr_t]
 
723
    transport_set_ptr.restype = None
 
724
 
 
725
    bye = _library.gnutls_bye
 
726
    bye.argtypes = [session_t, close_request_t]
 
727
    bye.restype = _error_code
 
728
    bye.errcheck = _retry_on_error
 
729
 
 
730
    check_version = _library.gnutls_check_version
 
731
    check_version.argtypes = [ctypes.c_char_p]
 
732
    check_version.restype = ctypes.c_char_p
 
733
 
 
734
    # All the function declarations below are from gnutls/openpgp.h
 
735
 
 
736
    openpgp_crt_init = _library.gnutls_openpgp_crt_init
 
737
    openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]
 
738
    openpgp_crt_init.restype = _error_code
 
739
 
 
740
    openpgp_crt_import = _library.gnutls_openpgp_crt_import
 
741
    openpgp_crt_import.argtypes = [openpgp_crt_t,
 
742
                                   ctypes.POINTER(datum_t),
 
743
                                   openpgp_crt_fmt_t]
 
744
    openpgp_crt_import.restype = _error_code
 
745
 
 
746
    openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self
 
747
    openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,
 
748
                                        ctypes.POINTER(ctypes.c_uint)]
 
749
    openpgp_crt_verify_self.restype = _error_code
 
750
 
 
751
    openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit
 
752
    openpgp_crt_deinit.argtypes = [openpgp_crt_t]
 
753
    openpgp_crt_deinit.restype = None
 
754
 
 
755
    openpgp_crt_get_fingerprint = (
 
756
        _library.gnutls_openpgp_crt_get_fingerprint)
 
757
    openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,
 
758
                                            ctypes.c_void_p,
 
759
                                            ctypes.POINTER(
 
760
                                                ctypes.c_size_t)]
 
761
    openpgp_crt_get_fingerprint.restype = _error_code
 
762
 
 
763
    # Remove non-public functions
 
764
    del _error_code, _retry_on_error
 
765
# Create the global "gnutls" object, simulating a module
 
766
gnutls = GnuTLS()
 
767
 
 
768
 
 
769
def call_pipe(connection,       # : multiprocessing.Connection
 
770
              func, *args, **kwargs):
 
771
    """This function is meant to be called by multiprocessing.Process
 
772
 
 
773
    This function runs func(*args, **kwargs), and writes the resulting
 
774
    return value on the provided multiprocessing.Connection.
 
775
    """
 
776
    connection.send(func(*args, **kwargs))
 
777
    connection.close()
169
778
 
170
779
 
171
780
class Client(object):
172
781
    """A representation of a client host served by this server.
 
782
 
173
783
    Attributes:
174
 
    name:      string; from the config file, used in log messages
 
784
    approved:   bool(); 'None' if not yet approved/disapproved
 
785
    approval_delay: datetime.timedelta(); Time to wait for approval
 
786
    approval_duration: datetime.timedelta(); Duration of one approval
 
787
    checker:    subprocess.Popen(); a running checker process used
 
788
                                    to see if the client lives.
 
789
                                    'None' if no process is running.
 
790
    checker_callback_tag: a GLib event source tag, or None
 
791
    checker_command: string; External command which is run to check
 
792
                     if client lives.  %() expansions are done at
 
793
                     runtime with vars(self) as dict, so that for
 
794
                     instance %(name)s can be used in the command.
 
795
    checker_initiator_tag: a GLib event source tag, or None
 
796
    created:    datetime.datetime(); (UTC) object creation
 
797
    client_structure: Object describing what attributes a client has
 
798
                      and is used for storing the client at exit
 
799
    current_checker_command: string; current running checker_command
 
800
    disable_initiator_tag: a GLib event source tag, or None
 
801
    enabled:    bool()
175
802
    fingerprint: string (40 or 32 hexadecimal digits); used to
176
803
                 uniquely identify the client
177
 
    secret:    bytestring; sent verbatim (over TLS) to client
178
 
    host:      string; 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
193
 
                     runtime with vars(self) as dict, so that for
194
 
                     instance %(name)s can be used in the command.
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: - '' -
 
804
    host:       string; available for use by the checker command
 
805
    interval:   datetime.timedelta(); How often to start a new checker
 
806
    last_approval_request: datetime.datetime(); (UTC) or None
 
807
    last_checked_ok: datetime.datetime(); (UTC) or None
 
808
    last_checker_status: integer between 0 and 255 reflecting exit
 
809
                         status of last checker. -1 reflects crashed
 
810
                         checker, -2 means no checker completed yet.
 
811
    last_checker_signal: The signal which killed the last checker, if
 
812
                         last_checker_status is -1
 
813
    last_enabled: datetime.datetime(); (UTC) or None
 
814
    name:       string; from the config file, used in log messages and
 
815
                        D-Bus identifiers
 
816
    secret:     bytestring; sent verbatim (over TLS) to client
 
817
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
818
                                      until this client is disabled
 
819
    extended_timeout:   extra long timeout when secret has been sent
 
820
    runtime_expansions: Allowed attributes for runtime expansion.
 
821
    expires:    datetime.datetime(); time (UTC) when a client will be
 
822
                disabled, or None
 
823
    server_settings: The server_settings dict from main()
200
824
    """
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, config={}):
225
 
        """Note: the 'checker' key in 'config' sets the
226
 
        'checker_command' attribute and *not* the 'checker'
227
 
        attribute."""
 
825
 
 
826
    runtime_expansions = ("approval_delay", "approval_duration",
 
827
                          "created", "enabled", "expires",
 
828
                          "fingerprint", "host", "interval",
 
829
                          "last_approval_request", "last_checked_ok",
 
830
                          "last_enabled", "name", "timeout")
 
831
    client_defaults = {
 
832
        "timeout": "PT5M",
 
833
        "extended_timeout": "PT15M",
 
834
        "interval": "PT2M",
 
835
        "checker": "fping -q -- %%(host)s",
 
836
        "host": "",
 
837
        "approval_delay": "PT0S",
 
838
        "approval_duration": "PT1S",
 
839
        "approved_by_default": "True",
 
840
        "enabled": "True",
 
841
    }
 
842
 
 
843
    @staticmethod
 
844
    def config_parser(config):
 
845
        """Construct a new dict of client settings of this form:
 
846
        { client_name: {setting_name: value, ...}, ...}
 
847
        with exceptions for any special settings as defined above.
 
848
        NOTE: Must be a pure function. Must return the same result
 
849
        value given the same arguments.
 
850
        """
 
851
        settings = {}
 
852
        for client_name in config.sections():
 
853
            section = dict(config.items(client_name))
 
854
            client = settings[client_name] = {}
 
855
 
 
856
            client["host"] = section["host"]
 
857
            # Reformat values from string types to Python types
 
858
            client["approved_by_default"] = config.getboolean(
 
859
                client_name, "approved_by_default")
 
860
            client["enabled"] = config.getboolean(client_name,
 
861
                                                  "enabled")
 
862
 
 
863
            # Uppercase and remove spaces from fingerprint for later
 
864
            # comparison purposes with return value from the
 
865
            # fingerprint() function
 
866
            client["fingerprint"] = (section["fingerprint"].upper()
 
867
                                     .replace(" ", ""))
 
868
            if "secret" in section:
 
869
                client["secret"] = codecs.decode(section["secret"]
 
870
                                                 .encode("utf-8"),
 
871
                                                 "base64")
 
872
            elif "secfile" in section:
 
873
                with open(os.path.expanduser(os.path.expandvars
 
874
                                             (section["secfile"])),
 
875
                          "rb") as secfile:
 
876
                    client["secret"] = secfile.read()
 
877
            else:
 
878
                raise TypeError("No secret or secfile for section {}"
 
879
                                .format(section))
 
880
            client["timeout"] = string_to_delta(section["timeout"])
 
881
            client["extended_timeout"] = string_to_delta(
 
882
                section["extended_timeout"])
 
883
            client["interval"] = string_to_delta(section["interval"])
 
884
            client["approval_delay"] = string_to_delta(
 
885
                section["approval_delay"])
 
886
            client["approval_duration"] = string_to_delta(
 
887
                section["approval_duration"])
 
888
            client["checker_command"] = section["checker"]
 
889
            client["last_approval_request"] = None
 
890
            client["last_checked_ok"] = None
 
891
            client["last_checker_status"] = -2
 
892
 
 
893
        return settings
 
894
 
 
895
    def __init__(self, settings, name=None, server_settings=None):
228
896
        self.name = name
229
 
        logger.debug(u"Creating client %r", self.name)
230
 
        # Uppercase and remove spaces from fingerprint for later
231
 
        # comparison purposes with return value from the fingerprint()
232
 
        # function
233
 
        self.fingerprint = config["fingerprint"].upper()\
234
 
                           .replace(u" ", u"")
235
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
236
 
        if "secret" in config:
237
 
            self.secret = config["secret"].decode(u"base64")
238
 
        elif "secfile" in config:
239
 
            sf = open(config["secfile"])
240
 
            self.secret = sf.read()
241
 
            sf.close()
 
897
        if server_settings is None:
 
898
            server_settings = {}
 
899
        self.server_settings = server_settings
 
900
        # adding all client settings
 
901
        for setting, value in settings.items():
 
902
            setattr(self, setting, value)
 
903
 
 
904
        if self.enabled:
 
905
            if not hasattr(self, "last_enabled"):
 
906
                self.last_enabled = datetime.datetime.utcnow()
 
907
            if not hasattr(self, "expires"):
 
908
                self.expires = (datetime.datetime.utcnow()
 
909
                                + self.timeout)
242
910
        else:
243
 
            raise TypeError(u"No secret or secfile for client %s"
244
 
                            % self.name)
245
 
        self.host = config.get("host", "")
246
 
        self.created = datetime.datetime.now()
247
 
        self.last_checked_ok = None
248
 
        self.timeout = string_to_delta(config["timeout"])
249
 
        self.interval = string_to_delta(config["interval"])
250
 
        self.stop_hook = stop_hook
 
911
            self.last_enabled = None
 
912
            self.expires = None
 
913
 
 
914
        logger.debug("Creating client %r", self.name)
 
915
        logger.debug("  Fingerprint: %s", self.fingerprint)
 
916
        self.created = settings.get("created",
 
917
                                    datetime.datetime.utcnow())
 
918
 
 
919
        # attributes specific for this server instance
251
920
        self.checker = None
252
921
        self.checker_initiator_tag = None
253
 
        self.stop_initiator_tag = None
 
922
        self.disable_initiator_tag = None
254
923
        self.checker_callback_tag = None
255
 
        self.check_command = config["checker"]
256
 
    def start(self):
 
924
        self.current_checker_command = None
 
925
        self.approved = None
 
926
        self.approvals_pending = 0
 
927
        self.changedstate = multiprocessing_manager.Condition(
 
928
            multiprocessing_manager.Lock())
 
929
        self.client_structure = [attr
 
930
                                 for attr in self.__dict__.keys()
 
931
                                 if not attr.startswith("_")]
 
932
        self.client_structure.append("client_structure")
 
933
 
 
934
        for name, t in inspect.getmembers(
 
935
                type(self), lambda obj: isinstance(obj, property)):
 
936
            if not name.startswith("_"):
 
937
                self.client_structure.append(name)
 
938
 
 
939
    # Send notice to process children that client state has changed
 
940
    def send_changedstate(self):
 
941
        with self.changedstate:
 
942
            self.changedstate.notify_all()
 
943
 
 
944
    def enable(self):
257
945
        """Start this client's checker and timeout hooks"""
 
946
        if getattr(self, "enabled", False):
 
947
            # Already enabled
 
948
            return
 
949
        self.expires = datetime.datetime.utcnow() + self.timeout
 
950
        self.enabled = True
 
951
        self.last_enabled = datetime.datetime.utcnow()
 
952
        self.init_checker()
 
953
        self.send_changedstate()
 
954
 
 
955
    def disable(self, quiet=True):
 
956
        """Disable this client."""
 
957
        if not getattr(self, "enabled", False):
 
958
            return False
 
959
        if not quiet:
 
960
            logger.info("Disabling client %s", self.name)
 
961
        if getattr(self, "disable_initiator_tag", None) is not None:
 
962
            GLib.source_remove(self.disable_initiator_tag)
 
963
            self.disable_initiator_tag = None
 
964
        self.expires = None
 
965
        if getattr(self, "checker_initiator_tag", None) is not None:
 
966
            GLib.source_remove(self.checker_initiator_tag)
 
967
            self.checker_initiator_tag = None
 
968
        self.stop_checker()
 
969
        self.enabled = False
 
970
        if not quiet:
 
971
            self.send_changedstate()
 
972
        # Do not run this again if called by a GLib.timeout_add
 
973
        return False
 
974
 
 
975
    def __del__(self):
 
976
        self.disable()
 
977
 
 
978
    def init_checker(self):
258
979
        # Schedule a new checker to be started an 'interval' from now,
259
980
        # and every interval from then on.
260
 
        self.checker_initiator_tag = gobject.timeout_add\
261
 
                                     (self._interval_milliseconds,
262
 
                                      self.start_checker)
 
981
        if self.checker_initiator_tag is not None:
 
982
            GLib.source_remove(self.checker_initiator_tag)
 
983
        self.checker_initiator_tag = GLib.timeout_add(
 
984
            int(self.interval.total_seconds() * 1000),
 
985
            self.start_checker)
 
986
        # Schedule a disable() when 'timeout' has passed
 
987
        if self.disable_initiator_tag is not None:
 
988
            GLib.source_remove(self.disable_initiator_tag)
 
989
        self.disable_initiator_tag = GLib.timeout_add(
 
990
            int(self.timeout.total_seconds() * 1000), self.disable)
263
991
        # Also start a new checker *right now*.
264
992
        self.start_checker()
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 hasattr(self, "secret") and self.secret:
275
 
            logger.info(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):
 
993
 
 
994
    def checker_callback(self, source, condition, connection,
 
995
                         command):
294
996
        """The checker has completed, so take appropriate actions."""
295
 
        now = datetime.datetime.now()
296
997
        self.checker_callback_tag = None
297
998
        self.checker = None
298
 
        if os.WIFEXITED(condition) \
299
 
               and (os.WEXITSTATUS(condition) == 0):
300
 
            logger.info(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?",
 
999
        # Read return code from connection (see call_pipe)
 
1000
        returncode = connection.recv()
 
1001
        connection.close()
 
1002
 
 
1003
        if returncode >= 0:
 
1004
            self.last_checker_status = returncode
 
1005
            self.last_checker_signal = None
 
1006
            if self.last_checker_status == 0:
 
1007
                logger.info("Checker for %(name)s succeeded",
 
1008
                            vars(self))
 
1009
                self.checked_ok()
 
1010
            else:
 
1011
                logger.info("Checker for %(name)s failed", vars(self))
 
1012
        else:
 
1013
            self.last_checker_status = -1
 
1014
            self.last_checker_signal = -returncode
 
1015
            logger.warning("Checker for %(name)s crashed?",
309
1016
                           vars(self))
310
 
        else:
311
 
            logger.info(u"Checker for %(name)s failed",
312
 
                        vars(self))
 
1017
        return False
 
1018
 
 
1019
    def checked_ok(self):
 
1020
        """Assert that the client has been seen, alive and well."""
 
1021
        self.last_checked_ok = datetime.datetime.utcnow()
 
1022
        self.last_checker_status = 0
 
1023
        self.last_checker_signal = None
 
1024
        self.bump_timeout()
 
1025
 
 
1026
    def bump_timeout(self, timeout=None):
 
1027
        """Bump up the timeout for this client."""
 
1028
        if timeout is None:
 
1029
            timeout = self.timeout
 
1030
        if self.disable_initiator_tag is not None:
 
1031
            GLib.source_remove(self.disable_initiator_tag)
 
1032
            self.disable_initiator_tag = None
 
1033
        if getattr(self, "enabled", False):
 
1034
            self.disable_initiator_tag = GLib.timeout_add(
 
1035
                int(timeout.total_seconds() * 1000), self.disable)
 
1036
            self.expires = datetime.datetime.utcnow() + timeout
 
1037
 
 
1038
    def need_approval(self):
 
1039
        self.last_approval_request = datetime.datetime.utcnow()
 
1040
 
313
1041
    def start_checker(self):
314
1042
        """Start a new checker subprocess if one is not running.
 
1043
 
315
1044
        If a checker already exists, leave it running and do
316
1045
        nothing."""
317
1046
        # The reason for not killing a running checker is that if we
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
 
1047
        # did that, and if a checker (for some reason) started running
 
1048
        # slowly and taking more than 'interval' time, then the client
 
1049
        # would inevitably timeout, since no checker would get a
 
1050
        # chance to run to completion.  If we instead leave running
322
1051
        # checkers alone, the checker would have to take more time
323
 
        # than 'timeout' for the client to be declared invalid, which
324
 
        # is as it should be.
 
1052
        # than 'timeout' for the client to be disabled, which is as it
 
1053
        # should be.
 
1054
 
 
1055
        if self.checker is not None and not self.checker.is_alive():
 
1056
            logger.warning("Checker was not alive; joining")
 
1057
            self.checker.join()
 
1058
            self.checker = None
 
1059
        # Start a new checker if needed
325
1060
        if self.checker is None:
326
 
            try:
327
 
                # In case check_command has exactly one % operator
328
 
                command = self.check_command % self.host
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.info(u"Starting checker %r for %s",
342
 
                            command, self.name)
343
 
                # We don't need to redirect stdout and stderr, since
344
 
                # in normal mode, that is already done by daemon(),
345
 
                # and in debug mode we don't want to.  (Stdin is
346
 
                # always replaced by /dev/null.)
347
 
                self.checker = subprocess.Popen(command,
348
 
                                                close_fds=True,
349
 
                                                shell=True, cwd="/")
350
 
                self.checker_callback_tag = gobject.child_watch_add\
351
 
                                            (self.checker.pid,
352
 
                                             self.checker_callback)
353
 
            except OSError, error:
354
 
                logger.error(u"Failed to start subprocess: %s",
355
 
                             error)
356
 
        # Re-run this periodically if run by gobject.timeout_add
 
1061
            # Escape attributes for the shell
 
1062
            escaped_attrs = {
 
1063
                attr: re.escape(str(getattr(self, attr)))
 
1064
                for attr in self.runtime_expansions}
 
1065
            try:
 
1066
                command = self.checker_command % escaped_attrs
 
1067
            except TypeError as error:
 
1068
                logger.error('Could not format string "%s"',
 
1069
                             self.checker_command,
 
1070
                             exc_info=error)
 
1071
                return True     # Try again later
 
1072
            self.current_checker_command = command
 
1073
            logger.info("Starting checker %r for %s", command,
 
1074
                        self.name)
 
1075
            # We don't need to redirect stdout and stderr, since
 
1076
            # in normal mode, that is already done by daemon(),
 
1077
            # and in debug mode we don't want to.  (Stdin is
 
1078
            # always replaced by /dev/null.)
 
1079
            # The exception is when not debugging but nevertheless
 
1080
            # running in the foreground; use the previously
 
1081
            # created wnull.
 
1082
            popen_args = {"close_fds": True,
 
1083
                          "shell": True,
 
1084
                          "cwd": "/"}
 
1085
            if (not self.server_settings["debug"]
 
1086
                and self.server_settings["foreground"]):
 
1087
                popen_args.update({"stdout": wnull,
 
1088
                                   "stderr": wnull})
 
1089
            pipe = multiprocessing.Pipe(duplex=False)
 
1090
            self.checker = multiprocessing.Process(
 
1091
                target=call_pipe,
 
1092
                args=(pipe[1], subprocess.call, command),
 
1093
                kwargs=popen_args)
 
1094
            self.checker.start()
 
1095
            self.checker_callback_tag = GLib.io_add_watch(
 
1096
                pipe[0].fileno(), GLib.IO_IN,
 
1097
                self.checker_callback, pipe[0], command)
 
1098
        # Re-run this periodically if run by GLib.timeout_add
357
1099
        return True
 
1100
 
358
1101
    def stop_checker(self):
359
1102
        """Force the checker process, if any, to stop."""
360
1103
        if self.checker_callback_tag:
361
 
            gobject.source_remove(self.checker_callback_tag)
 
1104
            GLib.source_remove(self.checker_callback_tag)
362
1105
            self.checker_callback_tag = None
363
1106
        if getattr(self, "checker", None) is None:
364
1107
            return
365
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
366
 
        try:
367
 
            os.kill(self.checker.pid, signal.SIGTERM)
368
 
            #os.sleep(0.5)
369
 
            #if self.checker.poll() is None:
370
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
371
 
        except OSError, error:
372
 
            if error.errno != errno.ESRCH: # No such process
373
 
                raise
 
1108
        logger.debug("Stopping checker for %(name)s", vars(self))
 
1109
        self.checker.terminate()
374
1110
        self.checker = None
375
 
    def still_valid(self):
376
 
        """Has the timeout not yet passed for this client?"""
377
 
        now = datetime.datetime.now()
378
 
        if self.last_checked_ok is None:
379
 
            return now < (self.created + self.timeout)
380
 
        else:
381
 
            return now < (self.last_checked_ok + self.timeout)
382
 
 
383
 
 
384
 
def peer_certificate(session):
385
 
    "Return the peer's OpenPGP certificate as a bytestring"
386
 
    # If not an OpenPGP certificate...
387
 
    if gnutls.library.functions.gnutls_certificate_type_get\
388
 
            (session._c_object) \
389
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
390
 
        # ...do the normal thing
391
 
        return session.peer_certificate
392
 
    list_size = ctypes.c_uint()
393
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
394
 
        (session._c_object, ctypes.byref(list_size))
395
 
    if list_size.value == 0:
396
 
        return None
397
 
    cert = cert_list[0]
398
 
    return ctypes.string_at(cert.data, cert.size)
399
 
 
400
 
 
401
 
def fingerprint(openpgp):
402
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
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
 
    # New empty GnuTLS certificate
409
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
410
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
411
 
        (ctypes.byref(crt))
412
 
    # Import the OpenPGP public key into the certificate
413
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
414
 
                    (crt, ctypes.byref(datum),
415
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
416
 
    # Verify the self signature in the key
417
 
    crtverify = ctypes.c_uint();
418
 
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
419
 
        (crt, 0, ctypes.byref(crtverify))
420
 
    if crtverify.value != 0:
421
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
422
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
423
 
    # New buffer for the fingerprint
424
 
    buffer = ctypes.create_string_buffer(20)
425
 
    buffer_length = ctypes.c_size_t()
426
 
    # Get the fingerprint from the certificate into the buffer
427
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
428
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
429
 
    # Deinit the certificate
430
 
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
431
 
    # Convert the buffer to a Python bytestring
432
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
433
 
    # Convert the bytestring to hexadecimal notation
434
 
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
435
 
    return hex_fpr
436
 
 
437
 
 
438
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
439
 
    """A TCP request handler class.
440
 
    Instantiated by IPv6_TCPServer for each request to handle it.
 
1111
 
 
1112
 
 
1113
def dbus_service_property(dbus_interface,
 
1114
                          signature="v",
 
1115
                          access="readwrite",
 
1116
                          byte_arrays=False):
 
1117
    """Decorators for marking methods of a DBusObjectWithProperties to
 
1118
    become properties on the D-Bus.
 
1119
 
 
1120
    The decorated method will be called with no arguments by "Get"
 
1121
    and with one argument by "Set".
 
1122
 
 
1123
    The parameters, where they are supported, are the same as
 
1124
    dbus.service.method, except there is only "signature", since the
 
1125
    type from Get() and the type sent to Set() is the same.
 
1126
    """
 
1127
    # Encoding deeply encoded byte arrays is not supported yet by the
 
1128
    # "Set" method, so we fail early here:
 
1129
    if byte_arrays and signature != "ay":
 
1130
        raise ValueError("Byte arrays not supported for non-'ay'"
 
1131
                         " signature {!r}".format(signature))
 
1132
 
 
1133
    def decorator(func):
 
1134
        func._dbus_is_property = True
 
1135
        func._dbus_interface = dbus_interface
 
1136
        func._dbus_signature = signature
 
1137
        func._dbus_access = access
 
1138
        func._dbus_name = func.__name__
 
1139
        if func._dbus_name.endswith("_dbus_property"):
 
1140
            func._dbus_name = func._dbus_name[:-14]
 
1141
        func._dbus_get_args_options = {'byte_arrays': byte_arrays}
 
1142
        return func
 
1143
 
 
1144
    return decorator
 
1145
 
 
1146
 
 
1147
def dbus_interface_annotations(dbus_interface):
 
1148
    """Decorator for marking functions returning interface annotations
 
1149
 
 
1150
    Usage:
 
1151
 
 
1152
    @dbus_interface_annotations("org.example.Interface")
 
1153
    def _foo(self):  # Function name does not matter
 
1154
        return {"org.freedesktop.DBus.Deprecated": "true",
 
1155
                "org.freedesktop.DBus.Property.EmitsChangedSignal":
 
1156
                    "false"}
 
1157
    """
 
1158
 
 
1159
    def decorator(func):
 
1160
        func._dbus_is_interface = True
 
1161
        func._dbus_interface = dbus_interface
 
1162
        func._dbus_name = dbus_interface
 
1163
        return func
 
1164
 
 
1165
    return decorator
 
1166
 
 
1167
 
 
1168
def dbus_annotations(annotations):
 
1169
    """Decorator to annotate D-Bus methods, signals or properties
 
1170
    Usage:
 
1171
 
 
1172
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true",
 
1173
                       "org.freedesktop.DBus.Property."
 
1174
                       "EmitsChangedSignal": "false"})
 
1175
    @dbus_service_property("org.example.Interface", signature="b",
 
1176
                           access="r")
 
1177
    def Property_dbus_property(self):
 
1178
        return dbus.Boolean(False)
 
1179
 
 
1180
    See also the DBusObjectWithAnnotations class.
 
1181
    """
 
1182
 
 
1183
    def decorator(func):
 
1184
        func._dbus_annotations = annotations
 
1185
        return func
 
1186
 
 
1187
    return decorator
 
1188
 
 
1189
 
 
1190
class DBusPropertyException(dbus.exceptions.DBusException):
 
1191
    """A base class for D-Bus property-related exceptions
 
1192
    """
 
1193
    pass
 
1194
 
 
1195
 
 
1196
class DBusPropertyAccessException(DBusPropertyException):
 
1197
    """A property's access permissions disallows an operation.
 
1198
    """
 
1199
    pass
 
1200
 
 
1201
 
 
1202
class DBusPropertyNotFound(DBusPropertyException):
 
1203
    """An attempt was made to access a non-existing property.
 
1204
    """
 
1205
    pass
 
1206
 
 
1207
 
 
1208
class DBusObjectWithAnnotations(dbus.service.Object):
 
1209
    """A D-Bus object with annotations.
 
1210
 
 
1211
    Classes inheriting from this can use the dbus_annotations
 
1212
    decorator to add annotations to methods or signals.
 
1213
    """
 
1214
 
 
1215
    @staticmethod
 
1216
    def _is_dbus_thing(thing):
 
1217
        """Returns a function testing if an attribute is a D-Bus thing
 
1218
 
 
1219
        If called like _is_dbus_thing("method") it returns a function
 
1220
        suitable for use as predicate to inspect.getmembers().
 
1221
        """
 
1222
        return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),
 
1223
                                   False)
 
1224
 
 
1225
    def _get_all_dbus_things(self, thing):
 
1226
        """Returns a generator of (name, attribute) pairs
 
1227
        """
 
1228
        return ((getattr(athing.__get__(self), "_dbus_name", name),
 
1229
                 athing.__get__(self))
 
1230
                for cls in self.__class__.__mro__
 
1231
                for name, athing in
 
1232
                inspect.getmembers(cls, self._is_dbus_thing(thing)))
 
1233
 
 
1234
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
1235
                         out_signature="s",
 
1236
                         path_keyword='object_path',
 
1237
                         connection_keyword='connection')
 
1238
    def Introspect(self, object_path, connection):
 
1239
        """Overloading of standard D-Bus method.
 
1240
 
 
1241
        Inserts annotation tags on methods and signals.
 
1242
        """
 
1243
        xmlstring = dbus.service.Object.Introspect(self, object_path,
 
1244
                                                   connection)
 
1245
        try:
 
1246
            document = xml.dom.minidom.parseString(xmlstring)
 
1247
 
 
1248
            for if_tag in document.getElementsByTagName("interface"):
 
1249
                # Add annotation tags
 
1250
                for typ in ("method", "signal"):
 
1251
                    for tag in if_tag.getElementsByTagName(typ):
 
1252
                        annots = dict()
 
1253
                        for name, prop in (self.
 
1254
                                           _get_all_dbus_things(typ)):
 
1255
                            if (name == tag.getAttribute("name")
 
1256
                                and prop._dbus_interface
 
1257
                                == if_tag.getAttribute("name")):
 
1258
                                annots.update(getattr(
 
1259
                                    prop, "_dbus_annotations", {}))
 
1260
                        for name, value in annots.items():
 
1261
                            ann_tag = document.createElement(
 
1262
                                "annotation")
 
1263
                            ann_tag.setAttribute("name", name)
 
1264
                            ann_tag.setAttribute("value", value)
 
1265
                            tag.appendChild(ann_tag)
 
1266
                # Add interface annotation tags
 
1267
                for annotation, value in dict(
 
1268
                    itertools.chain.from_iterable(
 
1269
                        annotations().items()
 
1270
                        for name, annotations
 
1271
                        in self._get_all_dbus_things("interface")
 
1272
                        if name == if_tag.getAttribute("name")
 
1273
                        )).items():
 
1274
                    ann_tag = document.createElement("annotation")
 
1275
                    ann_tag.setAttribute("name", annotation)
 
1276
                    ann_tag.setAttribute("value", value)
 
1277
                    if_tag.appendChild(ann_tag)
 
1278
                # Fix argument name for the Introspect method itself
 
1279
                if (if_tag.getAttribute("name")
 
1280
                    == dbus.INTROSPECTABLE_IFACE):
 
1281
                    for cn in if_tag.getElementsByTagName("method"):
 
1282
                        if cn.getAttribute("name") == "Introspect":
 
1283
                            for arg in cn.getElementsByTagName("arg"):
 
1284
                                if (arg.getAttribute("direction")
 
1285
                                    == "out"):
 
1286
                                    arg.setAttribute("name",
 
1287
                                                     "xml_data")
 
1288
            xmlstring = document.toxml("utf-8")
 
1289
            document.unlink()
 
1290
        except (AttributeError, xml.dom.DOMException,
 
1291
                xml.parsers.expat.ExpatError) as error:
 
1292
            logger.error("Failed to override Introspection method",
 
1293
                         exc_info=error)
 
1294
        return xmlstring
 
1295
 
 
1296
 
 
1297
class DBusObjectWithProperties(DBusObjectWithAnnotations):
 
1298
    """A D-Bus object with properties.
 
1299
 
 
1300
    Classes inheriting from this can use the dbus_service_property
 
1301
    decorator to expose methods as D-Bus properties.  It exposes the
 
1302
    standard Get(), Set(), and GetAll() methods on the D-Bus.
 
1303
    """
 
1304
 
 
1305
    def _get_dbus_property(self, interface_name, property_name):
 
1306
        """Returns a bound method if one exists which is a D-Bus
 
1307
        property with the specified name and interface.
 
1308
        """
 
1309
        for cls in self.__class__.__mro__:
 
1310
            for name, value in inspect.getmembers(
 
1311
                    cls, self._is_dbus_thing("property")):
 
1312
                if (value._dbus_name == property_name
 
1313
                    and value._dbus_interface == interface_name):
 
1314
                    return value.__get__(self)
 
1315
 
 
1316
        # No such property
 
1317
        raise DBusPropertyNotFound("{}:{}.{}".format(
 
1318
            self.dbus_object_path, interface_name, property_name))
 
1319
 
 
1320
    @classmethod
 
1321
    def _get_all_interface_names(cls):
 
1322
        """Get a sequence of all interfaces supported by an object"""
 
1323
        return (name for name in set(getattr(getattr(x, attr),
 
1324
                                             "_dbus_interface", None)
 
1325
                                     for x in (inspect.getmro(cls))
 
1326
                                     for attr in dir(x))
 
1327
                if name is not None)
 
1328
 
 
1329
    @dbus.service.method(dbus.PROPERTIES_IFACE,
 
1330
                         in_signature="ss",
 
1331
                         out_signature="v")
 
1332
    def Get(self, interface_name, property_name):
 
1333
        """Standard D-Bus property Get() method, see D-Bus standard.
 
1334
        """
 
1335
        prop = self._get_dbus_property(interface_name, property_name)
 
1336
        if prop._dbus_access == "write":
 
1337
            raise DBusPropertyAccessException(property_name)
 
1338
        value = prop()
 
1339
        if not hasattr(value, "variant_level"):
 
1340
            return value
 
1341
        return type(value)(value, variant_level=value.variant_level+1)
 
1342
 
 
1343
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
 
1344
    def Set(self, interface_name, property_name, value):
 
1345
        """Standard D-Bus property Set() method, see D-Bus standard.
 
1346
        """
 
1347
        prop = self._get_dbus_property(interface_name, property_name)
 
1348
        if prop._dbus_access == "read":
 
1349
            raise DBusPropertyAccessException(property_name)
 
1350
        if prop._dbus_get_args_options["byte_arrays"]:
 
1351
            # The byte_arrays option is not supported yet on
 
1352
            # signatures other than "ay".
 
1353
            if prop._dbus_signature != "ay":
 
1354
                raise ValueError("Byte arrays not supported for non-"
 
1355
                                 "'ay' signature {!r}"
 
1356
                                 .format(prop._dbus_signature))
 
1357
            value = dbus.ByteArray(b''.join(chr(byte)
 
1358
                                            for byte in value))
 
1359
        prop(value)
 
1360
 
 
1361
    @dbus.service.method(dbus.PROPERTIES_IFACE,
 
1362
                         in_signature="s",
 
1363
                         out_signature="a{sv}")
 
1364
    def GetAll(self, interface_name):
 
1365
        """Standard D-Bus property GetAll() method, see D-Bus
 
1366
        standard.
 
1367
 
 
1368
        Note: Will not include properties with access="write".
 
1369
        """
 
1370
        properties = {}
 
1371
        for name, prop in self._get_all_dbus_things("property"):
 
1372
            if (interface_name
 
1373
                and interface_name != prop._dbus_interface):
 
1374
                # Interface non-empty but did not match
 
1375
                continue
 
1376
            # Ignore write-only properties
 
1377
            if prop._dbus_access == "write":
 
1378
                continue
 
1379
            value = prop()
 
1380
            if not hasattr(value, "variant_level"):
 
1381
                properties[name] = value
 
1382
                continue
 
1383
            properties[name] = type(value)(
 
1384
                value, variant_level=value.variant_level + 1)
 
1385
        return dbus.Dictionary(properties, signature="sv")
 
1386
 
 
1387
    @dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")
 
1388
    def PropertiesChanged(self, interface_name, changed_properties,
 
1389
                          invalidated_properties):
 
1390
        """Standard D-Bus PropertiesChanged() signal, see D-Bus
 
1391
        standard.
 
1392
        """
 
1393
        pass
 
1394
 
 
1395
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
1396
                         out_signature="s",
 
1397
                         path_keyword='object_path',
 
1398
                         connection_keyword='connection')
 
1399
    def Introspect(self, object_path, connection):
 
1400
        """Overloading of standard D-Bus method.
 
1401
 
 
1402
        Inserts property tags and interface annotation tags.
 
1403
        """
 
1404
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
 
1405
                                                         object_path,
 
1406
                                                         connection)
 
1407
        try:
 
1408
            document = xml.dom.minidom.parseString(xmlstring)
 
1409
 
 
1410
            def make_tag(document, name, prop):
 
1411
                e = document.createElement("property")
 
1412
                e.setAttribute("name", name)
 
1413
                e.setAttribute("type", prop._dbus_signature)
 
1414
                e.setAttribute("access", prop._dbus_access)
 
1415
                return e
 
1416
 
 
1417
            for if_tag in document.getElementsByTagName("interface"):
 
1418
                # Add property tags
 
1419
                for tag in (make_tag(document, name, prop)
 
1420
                            for name, prop
 
1421
                            in self._get_all_dbus_things("property")
 
1422
                            if prop._dbus_interface
 
1423
                            == if_tag.getAttribute("name")):
 
1424
                    if_tag.appendChild(tag)
 
1425
                # Add annotation tags for properties
 
1426
                for tag in if_tag.getElementsByTagName("property"):
 
1427
                    annots = dict()
 
1428
                    for name, prop in self._get_all_dbus_things(
 
1429
                            "property"):
 
1430
                        if (name == tag.getAttribute("name")
 
1431
                            and prop._dbus_interface
 
1432
                            == if_tag.getAttribute("name")):
 
1433
                            annots.update(getattr(
 
1434
                                prop, "_dbus_annotations", {}))
 
1435
                    for name, value in annots.items():
 
1436
                        ann_tag = document.createElement(
 
1437
                            "annotation")
 
1438
                        ann_tag.setAttribute("name", name)
 
1439
                        ann_tag.setAttribute("value", value)
 
1440
                        tag.appendChild(ann_tag)
 
1441
                # Add the names to the return values for the
 
1442
                # "org.freedesktop.DBus.Properties" methods
 
1443
                if (if_tag.getAttribute("name")
 
1444
                    == "org.freedesktop.DBus.Properties"):
 
1445
                    for cn in if_tag.getElementsByTagName("method"):
 
1446
                        if cn.getAttribute("name") == "Get":
 
1447
                            for arg in cn.getElementsByTagName("arg"):
 
1448
                                if (arg.getAttribute("direction")
 
1449
                                    == "out"):
 
1450
                                    arg.setAttribute("name", "value")
 
1451
                        elif cn.getAttribute("name") == "GetAll":
 
1452
                            for arg in cn.getElementsByTagName("arg"):
 
1453
                                if (arg.getAttribute("direction")
 
1454
                                    == "out"):
 
1455
                                    arg.setAttribute("name", "props")
 
1456
            xmlstring = document.toxml("utf-8")
 
1457
            document.unlink()
 
1458
        except (AttributeError, xml.dom.DOMException,
 
1459
                xml.parsers.expat.ExpatError) as error:
 
1460
            logger.error("Failed to override Introspection method",
 
1461
                         exc_info=error)
 
1462
        return xmlstring
 
1463
 
 
1464
 
 
1465
try:
 
1466
    dbus.OBJECT_MANAGER_IFACE
 
1467
except AttributeError:
 
1468
    dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"
 
1469
 
 
1470
 
 
1471
class DBusObjectWithObjectManager(DBusObjectWithAnnotations):
 
1472
    """A D-Bus object with an ObjectManager.
 
1473
 
 
1474
    Classes inheriting from this exposes the standard
 
1475
    GetManagedObjects call and the InterfacesAdded and
 
1476
    InterfacesRemoved signals on the standard
 
1477
    "org.freedesktop.DBus.ObjectManager" interface.
 
1478
 
 
1479
    Note: No signals are sent automatically; they must be sent
 
1480
    manually.
 
1481
    """
 
1482
    @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
 
1483
                         out_signature="a{oa{sa{sv}}}")
 
1484
    def GetManagedObjects(self):
 
1485
        """This function must be overridden"""
 
1486
        raise NotImplementedError()
 
1487
 
 
1488
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,
 
1489
                         signature="oa{sa{sv}}")
 
1490
    def InterfacesAdded(self, object_path, interfaces_and_properties):
 
1491
        pass
 
1492
 
 
1493
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature="oas")
 
1494
    def InterfacesRemoved(self, object_path, interfaces):
 
1495
        pass
 
1496
 
 
1497
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
1498
                         out_signature="s",
 
1499
                         path_keyword='object_path',
 
1500
                         connection_keyword='connection')
 
1501
    def Introspect(self, object_path, connection):
 
1502
        """Overloading of standard D-Bus method.
 
1503
 
 
1504
        Override return argument name of GetManagedObjects to be
 
1505
        "objpath_interfaces_and_properties"
 
1506
        """
 
1507
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
 
1508
                                                         object_path,
 
1509
                                                         connection)
 
1510
        try:
 
1511
            document = xml.dom.minidom.parseString(xmlstring)
 
1512
 
 
1513
            for if_tag in document.getElementsByTagName("interface"):
 
1514
                # Fix argument name for the GetManagedObjects method
 
1515
                if (if_tag.getAttribute("name")
 
1516
                    == dbus.OBJECT_MANAGER_IFACE):
 
1517
                    for cn in if_tag.getElementsByTagName("method"):
 
1518
                        if (cn.getAttribute("name")
 
1519
                            == "GetManagedObjects"):
 
1520
                            for arg in cn.getElementsByTagName("arg"):
 
1521
                                if (arg.getAttribute("direction")
 
1522
                                    == "out"):
 
1523
                                    arg.setAttribute(
 
1524
                                        "name",
 
1525
                                        "objpath_interfaces"
 
1526
                                        "_and_properties")
 
1527
            xmlstring = document.toxml("utf-8")
 
1528
            document.unlink()
 
1529
        except (AttributeError, xml.dom.DOMException,
 
1530
                xml.parsers.expat.ExpatError) as error:
 
1531
            logger.error("Failed to override Introspection method",
 
1532
                         exc_info=error)
 
1533
        return xmlstring
 
1534
 
 
1535
 
 
1536
def datetime_to_dbus(dt, variant_level=0):
 
1537
    """Convert a UTC datetime.datetime() to a D-Bus type."""
 
1538
    if dt is None:
 
1539
        return dbus.String("", variant_level=variant_level)
 
1540
    return dbus.String(dt.isoformat(), variant_level=variant_level)
 
1541
 
 
1542
 
 
1543
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
 
1544
    """A class decorator; applied to a subclass of
 
1545
    dbus.service.Object, it will add alternate D-Bus attributes with
 
1546
    interface names according to the "alt_interface_names" mapping.
 
1547
    Usage:
 
1548
 
 
1549
    @alternate_dbus_interfaces({"org.example.Interface":
 
1550
                                    "net.example.AlternateInterface"})
 
1551
    class SampleDBusObject(dbus.service.Object):
 
1552
        @dbus.service.method("org.example.Interface")
 
1553
        def SampleDBusMethod():
 
1554
            pass
 
1555
 
 
1556
    The above "SampleDBusMethod" on "SampleDBusObject" will be
 
1557
    reachable via two interfaces: "org.example.Interface" and
 
1558
    "net.example.AlternateInterface", the latter of which will have
 
1559
    its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
 
1560
    "true", unless "deprecate" is passed with a False value.
 
1561
 
 
1562
    This works for methods and signals, and also for D-Bus properties
 
1563
    (from DBusObjectWithProperties) and interfaces (from the
 
1564
    dbus_interface_annotations decorator).
 
1565
    """
 
1566
 
 
1567
    def wrapper(cls):
 
1568
        for orig_interface_name, alt_interface_name in (
 
1569
                alt_interface_names.items()):
 
1570
            attr = {}
 
1571
            interface_names = set()
 
1572
            # Go though all attributes of the class
 
1573
            for attrname, attribute in inspect.getmembers(cls):
 
1574
                # Ignore non-D-Bus attributes, and D-Bus attributes
 
1575
                # with the wrong interface name
 
1576
                if (not hasattr(attribute, "_dbus_interface")
 
1577
                    or not attribute._dbus_interface.startswith(
 
1578
                        orig_interface_name)):
 
1579
                    continue
 
1580
                # Create an alternate D-Bus interface name based on
 
1581
                # the current name
 
1582
                alt_interface = attribute._dbus_interface.replace(
 
1583
                    orig_interface_name, alt_interface_name)
 
1584
                interface_names.add(alt_interface)
 
1585
                # Is this a D-Bus signal?
 
1586
                if getattr(attribute, "_dbus_is_signal", False):
 
1587
                    # Extract the original non-method undecorated
 
1588
                    # function by black magic
 
1589
                    if sys.version_info.major == 2:
 
1590
                        nonmethod_func = (dict(
 
1591
                            zip(attribute.func_code.co_freevars,
 
1592
                                attribute.__closure__))
 
1593
                                          ["func"].cell_contents)
 
1594
                    else:
 
1595
                        nonmethod_func = (dict(
 
1596
                            zip(attribute.__code__.co_freevars,
 
1597
                                attribute.__closure__))
 
1598
                                          ["func"].cell_contents)
 
1599
                    # Create a new, but exactly alike, function
 
1600
                    # object, and decorate it to be a new D-Bus signal
 
1601
                    # with the alternate D-Bus interface name
 
1602
                    new_function = copy_function(nonmethod_func)
 
1603
                    new_function = (dbus.service.signal(
 
1604
                        alt_interface,
 
1605
                        attribute._dbus_signature)(new_function))
 
1606
                    # Copy annotations, if any
 
1607
                    try:
 
1608
                        new_function._dbus_annotations = dict(
 
1609
                            attribute._dbus_annotations)
 
1610
                    except AttributeError:
 
1611
                        pass
 
1612
 
 
1613
                    # Define a creator of a function to call both the
 
1614
                    # original and alternate functions, so both the
 
1615
                    # original and alternate signals gets sent when
 
1616
                    # the function is called
 
1617
                    def fixscope(func1, func2):
 
1618
                        """This function is a scope container to pass
 
1619
                        func1 and func2 to the "call_both" function
 
1620
                        outside of its arguments"""
 
1621
 
 
1622
                        @functools.wraps(func2)
 
1623
                        def call_both(*args, **kwargs):
 
1624
                            """This function will emit two D-Bus
 
1625
                            signals by calling func1 and func2"""
 
1626
                            func1(*args, **kwargs)
 
1627
                            func2(*args, **kwargs)
 
1628
                        # Make wrapper function look like a D-Bus
 
1629
                        # signal
 
1630
                        for name, attr in inspect.getmembers(func2):
 
1631
                            if name.startswith("_dbus_"):
 
1632
                                setattr(call_both, name, attr)
 
1633
 
 
1634
                        return call_both
 
1635
                    # Create the "call_both" function and add it to
 
1636
                    # the class
 
1637
                    attr[attrname] = fixscope(attribute, new_function)
 
1638
                # Is this a D-Bus method?
 
1639
                elif getattr(attribute, "_dbus_is_method", False):
 
1640
                    # Create a new, but exactly alike, function
 
1641
                    # object.  Decorate it to be a new D-Bus method
 
1642
                    # with the alternate D-Bus interface name.  Add it
 
1643
                    # to the class.
 
1644
                    attr[attrname] = (
 
1645
                        dbus.service.method(
 
1646
                            alt_interface,
 
1647
                            attribute._dbus_in_signature,
 
1648
                            attribute._dbus_out_signature)
 
1649
                        (copy_function(attribute)))
 
1650
                    # Copy annotations, if any
 
1651
                    try:
 
1652
                        attr[attrname]._dbus_annotations = dict(
 
1653
                            attribute._dbus_annotations)
 
1654
                    except AttributeError:
 
1655
                        pass
 
1656
                # Is this a D-Bus property?
 
1657
                elif getattr(attribute, "_dbus_is_property", False):
 
1658
                    # Create a new, but exactly alike, function
 
1659
                    # object, and decorate it to be a new D-Bus
 
1660
                    # property with the alternate D-Bus interface
 
1661
                    # name.  Add it to the class.
 
1662
                    attr[attrname] = (dbus_service_property(
 
1663
                        alt_interface, attribute._dbus_signature,
 
1664
                        attribute._dbus_access,
 
1665
                        attribute._dbus_get_args_options
 
1666
                        ["byte_arrays"])
 
1667
                                      (copy_function(attribute)))
 
1668
                    # Copy annotations, if any
 
1669
                    try:
 
1670
                        attr[attrname]._dbus_annotations = dict(
 
1671
                            attribute._dbus_annotations)
 
1672
                    except AttributeError:
 
1673
                        pass
 
1674
                # Is this a D-Bus interface?
 
1675
                elif getattr(attribute, "_dbus_is_interface", False):
 
1676
                    # Create a new, but exactly alike, function
 
1677
                    # object.  Decorate it to be a new D-Bus interface
 
1678
                    # with the alternate D-Bus interface name.  Add it
 
1679
                    # to the class.
 
1680
                    attr[attrname] = (
 
1681
                        dbus_interface_annotations(alt_interface)
 
1682
                        (copy_function(attribute)))
 
1683
            if deprecate:
 
1684
                # Deprecate all alternate interfaces
 
1685
                iname = "_AlternateDBusNames_interface_annotation{}"
 
1686
                for interface_name in interface_names:
 
1687
 
 
1688
                    @dbus_interface_annotations(interface_name)
 
1689
                    def func(self):
 
1690
                        return {"org.freedesktop.DBus.Deprecated":
 
1691
                                "true"}
 
1692
                    # Find an unused name
 
1693
                    for aname in (iname.format(i)
 
1694
                                  for i in itertools.count()):
 
1695
                        if aname not in attr:
 
1696
                            attr[aname] = func
 
1697
                            break
 
1698
            if interface_names:
 
1699
                # Replace the class with a new subclass of it with
 
1700
                # methods, signals, etc. as created above.
 
1701
                if sys.version_info.major == 2:
 
1702
                    cls = type(b"{}Alternate".format(cls.__name__),
 
1703
                               (cls, ), attr)
 
1704
                else:
 
1705
                    cls = type("{}Alternate".format(cls.__name__),
 
1706
                               (cls, ), attr)
 
1707
        return cls
 
1708
 
 
1709
    return wrapper
 
1710
 
 
1711
 
 
1712
@alternate_dbus_interfaces({"se.recompile.Mandos":
 
1713
                            "se.bsnet.fukt.Mandos"})
 
1714
class ClientDBus(Client, DBusObjectWithProperties):
 
1715
    """A Client class using D-Bus
 
1716
 
 
1717
    Attributes:
 
1718
    dbus_object_path: dbus.ObjectPath
 
1719
    bus: dbus.SystemBus()
 
1720
    """
 
1721
 
 
1722
    runtime_expansions = (Client.runtime_expansions
 
1723
                          + ("dbus_object_path", ))
 
1724
 
 
1725
    _interface = "se.recompile.Mandos.Client"
 
1726
 
 
1727
    # dbus.service.Object doesn't use super(), so we can't either.
 
1728
 
 
1729
    def __init__(self, bus=None, *args, **kwargs):
 
1730
        self.bus = bus
 
1731
        Client.__init__(self, *args, **kwargs)
 
1732
        # Only now, when this client is initialized, can it show up on
 
1733
        # the D-Bus
 
1734
        client_object_name = str(self.name).translate(
 
1735
            {ord("."): ord("_"),
 
1736
             ord("-"): ord("_")})
 
1737
        self.dbus_object_path = dbus.ObjectPath(
 
1738
            "/clients/" + client_object_name)
 
1739
        DBusObjectWithProperties.__init__(self, self.bus,
 
1740
                                          self.dbus_object_path)
 
1741
 
 
1742
    def notifychangeproperty(transform_func, dbus_name,
 
1743
                             type_func=lambda x: x,
 
1744
                             variant_level=1,
 
1745
                             invalidate_only=False,
 
1746
                             _interface=_interface):
 
1747
        """ Modify a variable so that it's a property which announces
 
1748
        its changes to DBus.
 
1749
 
 
1750
        transform_fun: Function that takes a value and a variant_level
 
1751
                       and transforms it to a D-Bus type.
 
1752
        dbus_name: D-Bus name of the variable
 
1753
        type_func: Function that transform the value before sending it
 
1754
                   to the D-Bus.  Default: no transform
 
1755
        variant_level: D-Bus variant level.  Default: 1
 
1756
        """
 
1757
        attrname = "_{}".format(dbus_name)
 
1758
 
 
1759
        def setter(self, value):
 
1760
            if hasattr(self, "dbus_object_path"):
 
1761
                if (not hasattr(self, attrname) or
 
1762
                    type_func(getattr(self, attrname, None))
 
1763
                    != type_func(value)):
 
1764
                    if invalidate_only:
 
1765
                        self.PropertiesChanged(
 
1766
                            _interface, dbus.Dictionary(),
 
1767
                            dbus.Array((dbus_name, )))
 
1768
                    else:
 
1769
                        dbus_value = transform_func(
 
1770
                            type_func(value),
 
1771
                            variant_level=variant_level)
 
1772
                        self.PropertyChanged(dbus.String(dbus_name),
 
1773
                                             dbus_value)
 
1774
                        self.PropertiesChanged(
 
1775
                            _interface,
 
1776
                            dbus.Dictionary({dbus.String(dbus_name):
 
1777
                                             dbus_value}),
 
1778
                            dbus.Array())
 
1779
            setattr(self, attrname, value)
 
1780
 
 
1781
        return property(lambda self: getattr(self, attrname), setter)
 
1782
 
 
1783
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
 
1784
    approvals_pending = notifychangeproperty(dbus.Boolean,
 
1785
                                             "ApprovalPending",
 
1786
                                             type_func=bool)
 
1787
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
 
1788
    last_enabled = notifychangeproperty(datetime_to_dbus,
 
1789
                                        "LastEnabled")
 
1790
    checker = notifychangeproperty(
 
1791
        dbus.Boolean, "CheckerRunning",
 
1792
        type_func=lambda checker: checker is not None)
 
1793
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
 
1794
                                           "LastCheckedOK")
 
1795
    last_checker_status = notifychangeproperty(dbus.Int16,
 
1796
                                               "LastCheckerStatus")
 
1797
    last_approval_request = notifychangeproperty(
 
1798
        datetime_to_dbus, "LastApprovalRequest")
 
1799
    approved_by_default = notifychangeproperty(dbus.Boolean,
 
1800
                                               "ApprovedByDefault")
 
1801
    approval_delay = notifychangeproperty(
 
1802
        dbus.UInt64, "ApprovalDelay",
 
1803
        type_func=lambda td: td.total_seconds() * 1000)
 
1804
    approval_duration = notifychangeproperty(
 
1805
        dbus.UInt64, "ApprovalDuration",
 
1806
        type_func=lambda td: td.total_seconds() * 1000)
 
1807
    host = notifychangeproperty(dbus.String, "Host")
 
1808
    timeout = notifychangeproperty(
 
1809
        dbus.UInt64, "Timeout",
 
1810
        type_func=lambda td: td.total_seconds() * 1000)
 
1811
    extended_timeout = notifychangeproperty(
 
1812
        dbus.UInt64, "ExtendedTimeout",
 
1813
        type_func=lambda td: td.total_seconds() * 1000)
 
1814
    interval = notifychangeproperty(
 
1815
        dbus.UInt64, "Interval",
 
1816
        type_func=lambda td: td.total_seconds() * 1000)
 
1817
    checker_command = notifychangeproperty(dbus.String, "Checker")
 
1818
    secret = notifychangeproperty(dbus.ByteArray, "Secret",
 
1819
                                  invalidate_only=True)
 
1820
 
 
1821
    del notifychangeproperty
 
1822
 
 
1823
    def __del__(self, *args, **kwargs):
 
1824
        try:
 
1825
            self.remove_from_connection()
 
1826
        except LookupError:
 
1827
            pass
 
1828
        if hasattr(DBusObjectWithProperties, "__del__"):
 
1829
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
 
1830
        Client.__del__(self, *args, **kwargs)
 
1831
 
 
1832
    def checker_callback(self, source, condition,
 
1833
                         connection, command, *args, **kwargs):
 
1834
        ret = Client.checker_callback(self, source, condition,
 
1835
                                      connection, command, *args,
 
1836
                                      **kwargs)
 
1837
        exitstatus = self.last_checker_status
 
1838
        if exitstatus >= 0:
 
1839
            # Emit D-Bus signal
 
1840
            self.CheckerCompleted(dbus.Int16(exitstatus),
 
1841
                                  # This is specific to GNU libC
 
1842
                                  dbus.Int64(exitstatus << 8),
 
1843
                                  dbus.String(command))
 
1844
        else:
 
1845
            # Emit D-Bus signal
 
1846
            self.CheckerCompleted(dbus.Int16(-1),
 
1847
                                  dbus.Int64(
 
1848
                                      # This is specific to GNU libC
 
1849
                                      (exitstatus << 8)
 
1850
                                      | self.last_checker_signal),
 
1851
                                  dbus.String(command))
 
1852
        return ret
 
1853
 
 
1854
    def start_checker(self, *args, **kwargs):
 
1855
        old_checker_pid = getattr(self.checker, "pid", None)
 
1856
        r = Client.start_checker(self, *args, **kwargs)
 
1857
        # Only if new checker process was started
 
1858
        if (self.checker is not None
 
1859
            and old_checker_pid != self.checker.pid):
 
1860
            # Emit D-Bus signal
 
1861
            self.CheckerStarted(self.current_checker_command)
 
1862
        return r
 
1863
 
 
1864
    def _reset_approved(self):
 
1865
        self.approved = None
 
1866
        return False
 
1867
 
 
1868
    def approve(self, value=True):
 
1869
        self.approved = value
 
1870
        GLib.timeout_add(int(self.approval_duration.total_seconds()
 
1871
                             * 1000), self._reset_approved)
 
1872
        self.send_changedstate()
 
1873
 
 
1874
    #  D-Bus methods, signals & properties
 
1875
 
 
1876
    #  Interfaces
 
1877
 
 
1878
    #  Signals
 
1879
 
 
1880
    # CheckerCompleted - signal
 
1881
    @dbus.service.signal(_interface, signature="nxs")
 
1882
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
1883
        "D-Bus signal"
 
1884
        pass
 
1885
 
 
1886
    # CheckerStarted - signal
 
1887
    @dbus.service.signal(_interface, signature="s")
 
1888
    def CheckerStarted(self, command):
 
1889
        "D-Bus signal"
 
1890
        pass
 
1891
 
 
1892
    # PropertyChanged - signal
 
1893
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1894
    @dbus.service.signal(_interface, signature="sv")
 
1895
    def PropertyChanged(self, property, value):
 
1896
        "D-Bus signal"
 
1897
        pass
 
1898
 
 
1899
    # GotSecret - signal
 
1900
    @dbus.service.signal(_interface)
 
1901
    def GotSecret(self):
 
1902
        """D-Bus signal
 
1903
        Is sent after a successful transfer of secret from the Mandos
 
1904
        server to mandos-client
 
1905
        """
 
1906
        pass
 
1907
 
 
1908
    # Rejected - signal
 
1909
    @dbus.service.signal(_interface, signature="s")
 
1910
    def Rejected(self, reason):
 
1911
        "D-Bus signal"
 
1912
        pass
 
1913
 
 
1914
    # NeedApproval - signal
 
1915
    @dbus.service.signal(_interface, signature="tb")
 
1916
    def NeedApproval(self, timeout, default):
 
1917
        "D-Bus signal"
 
1918
        return self.need_approval()
 
1919
 
 
1920
    #  Methods
 
1921
 
 
1922
    # Approve - method
 
1923
    @dbus.service.method(_interface, in_signature="b")
 
1924
    def Approve(self, value):
 
1925
        self.approve(value)
 
1926
 
 
1927
    # CheckedOK - method
 
1928
    @dbus.service.method(_interface)
 
1929
    def CheckedOK(self):
 
1930
        self.checked_ok()
 
1931
 
 
1932
    # Enable - method
 
1933
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1934
    @dbus.service.method(_interface)
 
1935
    def Enable(self):
 
1936
        "D-Bus method"
 
1937
        self.enable()
 
1938
 
 
1939
    # StartChecker - method
 
1940
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1941
    @dbus.service.method(_interface)
 
1942
    def StartChecker(self):
 
1943
        "D-Bus method"
 
1944
        self.start_checker()
 
1945
 
 
1946
    # Disable - method
 
1947
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1948
    @dbus.service.method(_interface)
 
1949
    def Disable(self):
 
1950
        "D-Bus method"
 
1951
        self.disable()
 
1952
 
 
1953
    # StopChecker - method
 
1954
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1955
    @dbus.service.method(_interface)
 
1956
    def StopChecker(self):
 
1957
        self.stop_checker()
 
1958
 
 
1959
    #  Properties
 
1960
 
 
1961
    # ApprovalPending - property
 
1962
    @dbus_service_property(_interface, signature="b", access="read")
 
1963
    def ApprovalPending_dbus_property(self):
 
1964
        return dbus.Boolean(bool(self.approvals_pending))
 
1965
 
 
1966
    # ApprovedByDefault - property
 
1967
    @dbus_service_property(_interface,
 
1968
                           signature="b",
 
1969
                           access="readwrite")
 
1970
    def ApprovedByDefault_dbus_property(self, value=None):
 
1971
        if value is None:       # get
 
1972
            return dbus.Boolean(self.approved_by_default)
 
1973
        self.approved_by_default = bool(value)
 
1974
 
 
1975
    # ApprovalDelay - property
 
1976
    @dbus_service_property(_interface,
 
1977
                           signature="t",
 
1978
                           access="readwrite")
 
1979
    def ApprovalDelay_dbus_property(self, value=None):
 
1980
        if value is None:       # get
 
1981
            return dbus.UInt64(self.approval_delay.total_seconds()
 
1982
                               * 1000)
 
1983
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
 
1984
 
 
1985
    # ApprovalDuration - property
 
1986
    @dbus_service_property(_interface,
 
1987
                           signature="t",
 
1988
                           access="readwrite")
 
1989
    def ApprovalDuration_dbus_property(self, value=None):
 
1990
        if value is None:       # get
 
1991
            return dbus.UInt64(self.approval_duration.total_seconds()
 
1992
                               * 1000)
 
1993
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
 
1994
 
 
1995
    # Name - property
 
1996
    @dbus_annotations(
 
1997
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
 
1998
    @dbus_service_property(_interface, signature="s", access="read")
 
1999
    def Name_dbus_property(self):
 
2000
        return dbus.String(self.name)
 
2001
 
 
2002
    # Fingerprint - property
 
2003
    @dbus_annotations(
 
2004
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
 
2005
    @dbus_service_property(_interface, signature="s", access="read")
 
2006
    def Fingerprint_dbus_property(self):
 
2007
        return dbus.String(self.fingerprint)
 
2008
 
 
2009
    # Host - property
 
2010
    @dbus_service_property(_interface,
 
2011
                           signature="s",
 
2012
                           access="readwrite")
 
2013
    def Host_dbus_property(self, value=None):
 
2014
        if value is None:       # get
 
2015
            return dbus.String(self.host)
 
2016
        self.host = str(value)
 
2017
 
 
2018
    # Created - property
 
2019
    @dbus_annotations(
 
2020
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
 
2021
    @dbus_service_property(_interface, signature="s", access="read")
 
2022
    def Created_dbus_property(self):
 
2023
        return datetime_to_dbus(self.created)
 
2024
 
 
2025
    # LastEnabled - property
 
2026
    @dbus_service_property(_interface, signature="s", access="read")
 
2027
    def LastEnabled_dbus_property(self):
 
2028
        return datetime_to_dbus(self.last_enabled)
 
2029
 
 
2030
    # Enabled - property
 
2031
    @dbus_service_property(_interface,
 
2032
                           signature="b",
 
2033
                           access="readwrite")
 
2034
    def Enabled_dbus_property(self, value=None):
 
2035
        if value is None:       # get
 
2036
            return dbus.Boolean(self.enabled)
 
2037
        if value:
 
2038
            self.enable()
 
2039
        else:
 
2040
            self.disable()
 
2041
 
 
2042
    # LastCheckedOK - property
 
2043
    @dbus_service_property(_interface,
 
2044
                           signature="s",
 
2045
                           access="readwrite")
 
2046
    def LastCheckedOK_dbus_property(self, value=None):
 
2047
        if value is not None:
 
2048
            self.checked_ok()
 
2049
            return
 
2050
        return datetime_to_dbus(self.last_checked_ok)
 
2051
 
 
2052
    # LastCheckerStatus - property
 
2053
    @dbus_service_property(_interface, signature="n", access="read")
 
2054
    def LastCheckerStatus_dbus_property(self):
 
2055
        return dbus.Int16(self.last_checker_status)
 
2056
 
 
2057
    # Expires - property
 
2058
    @dbus_service_property(_interface, signature="s", access="read")
 
2059
    def Expires_dbus_property(self):
 
2060
        return datetime_to_dbus(self.expires)
 
2061
 
 
2062
    # LastApprovalRequest - property
 
2063
    @dbus_service_property(_interface, signature="s", access="read")
 
2064
    def LastApprovalRequest_dbus_property(self):
 
2065
        return datetime_to_dbus(self.last_approval_request)
 
2066
 
 
2067
    # Timeout - property
 
2068
    @dbus_service_property(_interface,
 
2069
                           signature="t",
 
2070
                           access="readwrite")
 
2071
    def Timeout_dbus_property(self, value=None):
 
2072
        if value is None:       # get
 
2073
            return dbus.UInt64(self.timeout.total_seconds() * 1000)
 
2074
        old_timeout = self.timeout
 
2075
        self.timeout = datetime.timedelta(0, 0, 0, value)
 
2076
        # Reschedule disabling
 
2077
        if self.enabled:
 
2078
            now = datetime.datetime.utcnow()
 
2079
            self.expires += self.timeout - old_timeout
 
2080
            if self.expires <= now:
 
2081
                # The timeout has passed
 
2082
                self.disable()
 
2083
            else:
 
2084
                if (getattr(self, "disable_initiator_tag", None)
 
2085
                    is None):
 
2086
                    return
 
2087
                GLib.source_remove(self.disable_initiator_tag)
 
2088
                self.disable_initiator_tag = GLib.timeout_add(
 
2089
                    int((self.expires - now).total_seconds() * 1000),
 
2090
                    self.disable)
 
2091
 
 
2092
    # ExtendedTimeout - property
 
2093
    @dbus_service_property(_interface,
 
2094
                           signature="t",
 
2095
                           access="readwrite")
 
2096
    def ExtendedTimeout_dbus_property(self, value=None):
 
2097
        if value is None:       # get
 
2098
            return dbus.UInt64(self.extended_timeout.total_seconds()
 
2099
                               * 1000)
 
2100
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
 
2101
 
 
2102
    # Interval - property
 
2103
    @dbus_service_property(_interface,
 
2104
                           signature="t",
 
2105
                           access="readwrite")
 
2106
    def Interval_dbus_property(self, value=None):
 
2107
        if value is None:       # get
 
2108
            return dbus.UInt64(self.interval.total_seconds() * 1000)
 
2109
        self.interval = datetime.timedelta(0, 0, 0, value)
 
2110
        if getattr(self, "checker_initiator_tag", None) is None:
 
2111
            return
 
2112
        if self.enabled:
 
2113
            # Reschedule checker run
 
2114
            GLib.source_remove(self.checker_initiator_tag)
 
2115
            self.checker_initiator_tag = GLib.timeout_add(
 
2116
                value, self.start_checker)
 
2117
            self.start_checker()  # Start one now, too
 
2118
 
 
2119
    # Checker - property
 
2120
    @dbus_service_property(_interface,
 
2121
                           signature="s",
 
2122
                           access="readwrite")
 
2123
    def Checker_dbus_property(self, value=None):
 
2124
        if value is None:       # get
 
2125
            return dbus.String(self.checker_command)
 
2126
        self.checker_command = str(value)
 
2127
 
 
2128
    # CheckerRunning - property
 
2129
    @dbus_service_property(_interface,
 
2130
                           signature="b",
 
2131
                           access="readwrite")
 
2132
    def CheckerRunning_dbus_property(self, value=None):
 
2133
        if value is None:       # get
 
2134
            return dbus.Boolean(self.checker is not None)
 
2135
        if value:
 
2136
            self.start_checker()
 
2137
        else:
 
2138
            self.stop_checker()
 
2139
 
 
2140
    # ObjectPath - property
 
2141
    @dbus_annotations(
 
2142
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",
 
2143
         "org.freedesktop.DBus.Deprecated": "true"})
 
2144
    @dbus_service_property(_interface, signature="o", access="read")
 
2145
    def ObjectPath_dbus_property(self):
 
2146
        return self.dbus_object_path  # is already a dbus.ObjectPath
 
2147
 
 
2148
    # Secret = property
 
2149
    @dbus_annotations(
 
2150
        {"org.freedesktop.DBus.Property.EmitsChangedSignal":
 
2151
         "invalidates"})
 
2152
    @dbus_service_property(_interface,
 
2153
                           signature="ay",
 
2154
                           access="write",
 
2155
                           byte_arrays=True)
 
2156
    def Secret_dbus_property(self, value):
 
2157
        self.secret = bytes(value)
 
2158
 
 
2159
    del _interface
 
2160
 
 
2161
 
 
2162
class ProxyClient(object):
 
2163
    def __init__(self, child_pipe, fpr, address):
 
2164
        self._pipe = child_pipe
 
2165
        self._pipe.send(('init', fpr, address))
 
2166
        if not self._pipe.recv():
 
2167
            raise KeyError(fpr)
 
2168
 
 
2169
    def __getattribute__(self, name):
 
2170
        if name == '_pipe':
 
2171
            return super(ProxyClient, self).__getattribute__(name)
 
2172
        self._pipe.send(('getattr', name))
 
2173
        data = self._pipe.recv()
 
2174
        if data[0] == 'data':
 
2175
            return data[1]
 
2176
        if data[0] == 'function':
 
2177
 
 
2178
            def func(*args, **kwargs):
 
2179
                self._pipe.send(('funcall', name, args, kwargs))
 
2180
                return self._pipe.recv()[1]
 
2181
 
 
2182
            return func
 
2183
 
 
2184
    def __setattr__(self, name, value):
 
2185
        if name == '_pipe':
 
2186
            return super(ProxyClient, self).__setattr__(name, value)
 
2187
        self._pipe.send(('setattr', name, value))
 
2188
 
 
2189
 
 
2190
class ClientHandler(socketserver.BaseRequestHandler, object):
 
2191
    """A class to handle client connections.
 
2192
 
 
2193
    Instantiated once for each connection to handle it.
441
2194
    Note: This will run in its own forked process."""
442
 
    
 
2195
 
443
2196
    def handle(self):
444
 
        logger.info(u"TCP connection from: %s",
445
 
                     unicode(self.client_address))
446
 
        session = gnutls.connection.ClientSession\
447
 
                  (self.request, gnutls.connection.X509Credentials())
448
 
        
449
 
        line = self.request.makefile().readline()
450
 
        logger.debug(u"Protocol version: %r", line)
451
 
        try:
452
 
            if int(line.strip().split()[0]) > 1:
453
 
                raise RuntimeError
454
 
        except (ValueError, IndexError, RuntimeError), error:
455
 
            logger.error(u"Unknown protocol version: %s", error)
456
 
            return
457
 
        
458
 
        # Note: gnutls.connection.X509Credentials is really a generic
459
 
        # GnuTLS certificate credentials object so long as no X.509
460
 
        # keys are added to it.  Therefore, we can use it here despite
461
 
        # using OpenPGP certificates.
462
 
        
463
 
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
464
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
465
 
        #                "+DHE-DSS"))
466
 
        priority = "NORMAL"             # Fallback default, since this
467
 
                                        # MUST be set.
468
 
        if self.server.settings["priority"]:
469
 
            priority = self.server.settings["priority"]
470
 
        gnutls.library.functions.gnutls_priority_set_direct\
471
 
            (session._c_object, priority, None);
472
 
        
473
 
        try:
474
 
            session.handshake()
475
 
        except gnutls.errors.GNUTLSError, error:
476
 
            logger.warning(u"Handshake failed: %s", error)
477
 
            # Do not run session.bye() here: the session is not
478
 
            # established.  Just abandon the request.
479
 
            return
480
 
        try:
481
 
            fpr = fingerprint(peer_certificate(session))
482
 
        except (TypeError, gnutls.errors.GNUTLSError), error:
483
 
            logger.warning(u"Bad certificate: %s", error)
484
 
            session.bye()
485
 
            return
486
 
        logger.debug(u"Fingerprint: %s", fpr)
487
 
        client = None
488
 
        for c in self.server.clients:
489
 
            if c.fingerprint == fpr:
490
 
                client = c
491
 
                break
492
 
        if not client:
493
 
            logger.warning(u"Client not found for fingerprint: %s",
494
 
                           fpr)
495
 
            session.bye()
496
 
            return
497
 
        # Have to check if client.still_valid(), since it is possible
498
 
        # that the client timed out while establishing the GnuTLS
499
 
        # session.
500
 
        if not client.still_valid():
501
 
            logger.warning(u"Client %(name)s is invalid",
502
 
                           vars(client))
503
 
            session.bye()
504
 
            return
505
 
        sent_size = 0
506
 
        while sent_size < len(client.secret):
507
 
            sent = session.send(client.secret[sent_size:])
508
 
            logger.debug(u"Sent: %d, remaining: %d",
509
 
                         sent, len(client.secret)
510
 
                         - (sent_size + sent))
511
 
            sent_size += sent
512
 
        session.bye()
513
 
 
514
 
 
515
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
516
 
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
2197
        with contextlib.closing(self.server.child_pipe) as child_pipe:
 
2198
            logger.info("TCP connection from: %s",
 
2199
                        str(self.client_address))
 
2200
            logger.debug("Pipe FD: %d",
 
2201
                         self.server.child_pipe.fileno())
 
2202
 
 
2203
            session = gnutls.ClientSession(self.request)
 
2204
 
 
2205
            # priority = ':'.join(("NONE", "+VERS-TLS1.1",
 
2206
            #                       "+AES-256-CBC", "+SHA1",
 
2207
            #                       "+COMP-NULL", "+CTYPE-OPENPGP",
 
2208
            #                       "+DHE-DSS"))
 
2209
            # Use a fallback default, since this MUST be set.
 
2210
            priority = self.server.gnutls_priority
 
2211
            if priority is None:
 
2212
                priority = "NORMAL"
 
2213
            gnutls.priority_set_direct(session._c_object,
 
2214
                                       priority.encode("utf-8"),
 
2215
                                       None)
 
2216
 
 
2217
            # Start communication using the Mandos protocol
 
2218
            # Get protocol number
 
2219
            line = self.request.makefile().readline()
 
2220
            logger.debug("Protocol version: %r", line)
 
2221
            try:
 
2222
                if int(line.strip().split()[0]) > 1:
 
2223
                    raise RuntimeError(line)
 
2224
            except (ValueError, IndexError, RuntimeError) as error:
 
2225
                logger.error("Unknown protocol version: %s", error)
 
2226
                return
 
2227
 
 
2228
            # Start GnuTLS connection
 
2229
            try:
 
2230
                session.handshake()
 
2231
            except gnutls.Error as error:
 
2232
                logger.warning("Handshake failed: %s", error)
 
2233
                # Do not run session.bye() here: the session is not
 
2234
                # established.  Just abandon the request.
 
2235
                return
 
2236
            logger.debug("Handshake succeeded")
 
2237
 
 
2238
            approval_required = False
 
2239
            try:
 
2240
                try:
 
2241
                    fpr = self.fingerprint(
 
2242
                        self.peer_certificate(session))
 
2243
                except (TypeError, gnutls.Error) as error:
 
2244
                    logger.warning("Bad certificate: %s", error)
 
2245
                    return
 
2246
                logger.debug("Fingerprint: %s", fpr)
 
2247
 
 
2248
                try:
 
2249
                    client = ProxyClient(child_pipe, fpr,
 
2250
                                         self.client_address)
 
2251
                except KeyError:
 
2252
                    return
 
2253
 
 
2254
                if client.approval_delay:
 
2255
                    delay = client.approval_delay
 
2256
                    client.approvals_pending += 1
 
2257
                    approval_required = True
 
2258
 
 
2259
                while True:
 
2260
                    if not client.enabled:
 
2261
                        logger.info("Client %s is disabled",
 
2262
                                    client.name)
 
2263
                        if self.server.use_dbus:
 
2264
                            # Emit D-Bus signal
 
2265
                            client.Rejected("Disabled")
 
2266
                        return
 
2267
 
 
2268
                    if client.approved or not client.approval_delay:
 
2269
                        # We are approved or approval is disabled
 
2270
                        break
 
2271
                    elif client.approved is None:
 
2272
                        logger.info("Client %s needs approval",
 
2273
                                    client.name)
 
2274
                        if self.server.use_dbus:
 
2275
                            # Emit D-Bus signal
 
2276
                            client.NeedApproval(
 
2277
                                client.approval_delay.total_seconds()
 
2278
                                * 1000, client.approved_by_default)
 
2279
                    else:
 
2280
                        logger.warning("Client %s was not approved",
 
2281
                                       client.name)
 
2282
                        if self.server.use_dbus:
 
2283
                            # Emit D-Bus signal
 
2284
                            client.Rejected("Denied")
 
2285
                        return
 
2286
 
 
2287
                    # wait until timeout or approved
 
2288
                    time = datetime.datetime.now()
 
2289
                    client.changedstate.acquire()
 
2290
                    client.changedstate.wait(delay.total_seconds())
 
2291
                    client.changedstate.release()
 
2292
                    time2 = datetime.datetime.now()
 
2293
                    if (time2 - time) >= delay:
 
2294
                        if not client.approved_by_default:
 
2295
                            logger.warning("Client %s timed out while"
 
2296
                                           " waiting for approval",
 
2297
                                           client.name)
 
2298
                            if self.server.use_dbus:
 
2299
                                # Emit D-Bus signal
 
2300
                                client.Rejected("Approval timed out")
 
2301
                            return
 
2302
                        else:
 
2303
                            break
 
2304
                    else:
 
2305
                        delay -= time2 - time
 
2306
 
 
2307
                try:
 
2308
                    session.send(client.secret)
 
2309
                except gnutls.Error as error:
 
2310
                    logger.warning("gnutls send failed",
 
2311
                                   exc_info=error)
 
2312
                    return
 
2313
 
 
2314
                logger.info("Sending secret to %s", client.name)
 
2315
                # bump the timeout using extended_timeout
 
2316
                client.bump_timeout(client.extended_timeout)
 
2317
                if self.server.use_dbus:
 
2318
                    # Emit D-Bus signal
 
2319
                    client.GotSecret()
 
2320
 
 
2321
            finally:
 
2322
                if approval_required:
 
2323
                    client.approvals_pending -= 1
 
2324
                try:
 
2325
                    session.bye()
 
2326
                except gnutls.Error as error:
 
2327
                    logger.warning("GnuTLS bye failed",
 
2328
                                   exc_info=error)
 
2329
 
 
2330
    @staticmethod
 
2331
    def peer_certificate(session):
 
2332
        "Return the peer's OpenPGP certificate as a bytestring"
 
2333
        # If not an OpenPGP certificate...
 
2334
        if (gnutls.certificate_type_get(session._c_object)
 
2335
            != gnutls.CRT_OPENPGP):
 
2336
            # ...return invalid data
 
2337
            return b""
 
2338
        list_size = ctypes.c_uint(1)
 
2339
        cert_list = (gnutls.certificate_get_peers
 
2340
                     (session._c_object, ctypes.byref(list_size)))
 
2341
        if not bool(cert_list) and list_size.value != 0:
 
2342
            raise gnutls.Error("error getting peer certificate")
 
2343
        if list_size.value == 0:
 
2344
            return None
 
2345
        cert = cert_list[0]
 
2346
        return ctypes.string_at(cert.data, cert.size)
 
2347
 
 
2348
    @staticmethod
 
2349
    def fingerprint(openpgp):
 
2350
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
 
2351
        # New GnuTLS "datum" with the OpenPGP public key
 
2352
        datum = gnutls.datum_t(
 
2353
            ctypes.cast(ctypes.c_char_p(openpgp),
 
2354
                        ctypes.POINTER(ctypes.c_ubyte)),
 
2355
            ctypes.c_uint(len(openpgp)))
 
2356
        # New empty GnuTLS certificate
 
2357
        crt = gnutls.openpgp_crt_t()
 
2358
        gnutls.openpgp_crt_init(ctypes.byref(crt))
 
2359
        # Import the OpenPGP public key into the certificate
 
2360
        gnutls.openpgp_crt_import(crt, ctypes.byref(datum),
 
2361
                                  gnutls.OPENPGP_FMT_RAW)
 
2362
        # Verify the self signature in the key
 
2363
        crtverify = ctypes.c_uint()
 
2364
        gnutls.openpgp_crt_verify_self(crt, 0,
 
2365
                                       ctypes.byref(crtverify))
 
2366
        if crtverify.value != 0:
 
2367
            gnutls.openpgp_crt_deinit(crt)
 
2368
            raise gnutls.CertificateSecurityError(code
 
2369
                                                  =crtverify.value)
 
2370
        # New buffer for the fingerprint
 
2371
        buf = ctypes.create_string_buffer(20)
 
2372
        buf_len = ctypes.c_size_t()
 
2373
        # Get the fingerprint from the certificate into the buffer
 
2374
        gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
2375
                                           ctypes.byref(buf_len))
 
2376
        # Deinit the certificate
 
2377
        gnutls.openpgp_crt_deinit(crt)
 
2378
        # Convert the buffer to a Python bytestring
 
2379
        fpr = ctypes.string_at(buf, buf_len.value)
 
2380
        # Convert the bytestring to hexadecimal notation
 
2381
        hex_fpr = binascii.hexlify(fpr).upper()
 
2382
        return hex_fpr
 
2383
 
 
2384
 
 
2385
class MultiprocessingMixIn(object):
 
2386
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
 
2387
 
 
2388
    def sub_process_main(self, request, address):
 
2389
        try:
 
2390
            self.finish_request(request, address)
 
2391
        except Exception:
 
2392
            self.handle_error(request, address)
 
2393
        self.close_request(request)
 
2394
 
 
2395
    def process_request(self, request, address):
 
2396
        """Start a new process to process the request."""
 
2397
        proc = multiprocessing.Process(target=self.sub_process_main,
 
2398
                                       args=(request, address))
 
2399
        proc.start()
 
2400
        return proc
 
2401
 
 
2402
 
 
2403
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
 
2404
    """ adds a pipe to the MixIn """
 
2405
 
 
2406
    def process_request(self, request, client_address):
 
2407
        """Overrides and wraps the original process_request().
 
2408
 
 
2409
        This function creates a new pipe in self.pipe
 
2410
        """
 
2411
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
 
2412
 
 
2413
        proc = MultiprocessingMixIn.process_request(self, request,
 
2414
                                                    client_address)
 
2415
        self.child_pipe.close()
 
2416
        self.add_pipe(parent_pipe, proc)
 
2417
 
 
2418
    def add_pipe(self, parent_pipe, proc):
 
2419
        """Dummy function; override as necessary"""
 
2420
        raise NotImplementedError()
 
2421
 
 
2422
 
 
2423
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
 
2424
                     socketserver.TCPServer, object):
 
2425
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
2426
 
517
2427
    Attributes:
518
 
        settings:       Server settings
519
 
        clients:        Set() of Client objects
 
2428
        enabled:        Boolean; whether this server is activated yet
 
2429
        interface:      None or a network interface name (string)
 
2430
        use_ipv6:       Boolean; to use IPv6 or not
520
2431
    """
521
 
    address_family = socket.AF_INET6
522
 
    def __init__(self, *args, **kwargs):
523
 
        if "settings" in kwargs:
524
 
            self.settings = kwargs["settings"]
525
 
            del kwargs["settings"]
526
 
        if "clients" in kwargs:
527
 
            self.clients = kwargs["clients"]
528
 
            del kwargs["clients"]
529
 
        return super(type(self), self).__init__(*args, **kwargs)
 
2432
 
 
2433
    def __init__(self, server_address, RequestHandlerClass,
 
2434
                 interface=None,
 
2435
                 use_ipv6=True,
 
2436
                 socketfd=None):
 
2437
        """If socketfd is set, use that file descriptor instead of
 
2438
        creating a new one with socket.socket().
 
2439
        """
 
2440
        self.interface = interface
 
2441
        if use_ipv6:
 
2442
            self.address_family = socket.AF_INET6
 
2443
        if socketfd is not None:
 
2444
            # Save the file descriptor
 
2445
            self.socketfd = socketfd
 
2446
            # Save the original socket.socket() function
 
2447
            self.socket_socket = socket.socket
 
2448
 
 
2449
            # To implement --socket, we monkey patch socket.socket.
 
2450
            #
 
2451
            # (When socketserver.TCPServer is a new-style class, we
 
2452
            # could make self.socket into a property instead of monkey
 
2453
            # patching socket.socket.)
 
2454
            #
 
2455
            # Create a one-time-only replacement for socket.socket()
 
2456
            @functools.wraps(socket.socket)
 
2457
            def socket_wrapper(*args, **kwargs):
 
2458
                # Restore original function so subsequent calls are
 
2459
                # not affected.
 
2460
                socket.socket = self.socket_socket
 
2461
                del self.socket_socket
 
2462
                # This time only, return a new socket object from the
 
2463
                # saved file descriptor.
 
2464
                return socket.fromfd(self.socketfd, *args, **kwargs)
 
2465
            # Replace socket.socket() function with wrapper
 
2466
            socket.socket = socket_wrapper
 
2467
        # The socketserver.TCPServer.__init__ will call
 
2468
        # socket.socket(), which might be our replacement,
 
2469
        # socket_wrapper(), if socketfd was set.
 
2470
        socketserver.TCPServer.__init__(self, server_address,
 
2471
                                        RequestHandlerClass)
 
2472
 
530
2473
    def server_bind(self):
531
2474
        """This overrides the normal server_bind() function
532
2475
        to bind to an interface if one was specified, and also NOT to
533
2476
        bind to an address or port if they were not specified."""
534
 
        if self.settings["interface"]:
535
 
            # 25 is from /usr/include/asm-i486/socket.h
536
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
2477
        global SO_BINDTODEVICE
 
2478
        if self.interface is not None:
 
2479
            if SO_BINDTODEVICE is None:
 
2480
                # Fall back to a hard-coded value which seems to be
 
2481
                # common enough.
 
2482
                logger.warning("SO_BINDTODEVICE not found, trying 25")
 
2483
                SO_BINDTODEVICE = 25
537
2484
            try:
538
 
                self.socket.setsockopt(socket.SOL_SOCKET,
539
 
                                       SO_BINDTODEVICE,
540
 
                                       self.settings["interface"])
541
 
            except socket.error, error:
542
 
                if error[0] == errno.EPERM:
543
 
                    logger.error(u"No permission to"
544
 
                                 u" bind to interface %s",
545
 
                                 self.settings["interface"])
 
2485
                self.socket.setsockopt(
 
2486
                    socket.SOL_SOCKET, SO_BINDTODEVICE,
 
2487
                    (self.interface + "\0").encode("utf-8"))
 
2488
            except socket.error as error:
 
2489
                if error.errno == errno.EPERM:
 
2490
                    logger.error("No permission to bind to"
 
2491
                                 " interface %s", self.interface)
 
2492
                elif error.errno == errno.ENOPROTOOPT:
 
2493
                    logger.error("SO_BINDTODEVICE not available;"
 
2494
                                 " cannot bind to interface %s",
 
2495
                                 self.interface)
 
2496
                elif error.errno == errno.ENODEV:
 
2497
                    logger.error("Interface %s does not exist,"
 
2498
                                 " cannot bind", self.interface)
546
2499
                else:
547
 
                    raise error
 
2500
                    raise
548
2501
        # Only bind(2) the socket if we really need to.
549
2502
        if self.server_address[0] or self.server_address[1]:
550
2503
            if not self.server_address[0]:
551
 
                in6addr_any = "::"
552
 
                self.server_address = (in6addr_any,
 
2504
                if self.address_family == socket.AF_INET6:
 
2505
                    any_address = "::"  # in6addr_any
 
2506
                else:
 
2507
                    any_address = "0.0.0.0"  # INADDR_ANY
 
2508
                self.server_address = (any_address,
553
2509
                                       self.server_address[1])
554
2510
            elif not self.server_address[1]:
555
 
                self.server_address = (self.server_address[0],
556
 
                                       0)
557
 
#                 if self.settings["interface"]:
 
2511
                self.server_address = (self.server_address[0], 0)
 
2512
#                 if self.interface:
558
2513
#                     self.server_address = (self.server_address[0],
559
2514
#                                            0, # port
560
2515
#                                            0, # flowinfo
561
2516
#                                            if_nametoindex
562
 
#                                            (self.settings
563
 
#                                             ["interface"]))
564
 
            return super(type(self), self).server_bind()
 
2517
#                                            (self.interface))
 
2518
            return socketserver.TCPServer.server_bind(self)
 
2519
 
 
2520
 
 
2521
class MandosServer(IPv6_TCPServer):
 
2522
    """Mandos server.
 
2523
 
 
2524
    Attributes:
 
2525
        clients:        set of Client objects
 
2526
        gnutls_priority GnuTLS priority string
 
2527
        use_dbus:       Boolean; to emit D-Bus signals or not
 
2528
 
 
2529
    Assumes a GLib.MainLoop event loop.
 
2530
    """
 
2531
 
 
2532
    def __init__(self, server_address, RequestHandlerClass,
 
2533
                 interface=None,
 
2534
                 use_ipv6=True,
 
2535
                 clients=None,
 
2536
                 gnutls_priority=None,
 
2537
                 use_dbus=True,
 
2538
                 socketfd=None):
 
2539
        self.enabled = False
 
2540
        self.clients = clients
 
2541
        if self.clients is None:
 
2542
            self.clients = {}
 
2543
        self.use_dbus = use_dbus
 
2544
        self.gnutls_priority = gnutls_priority
 
2545
        IPv6_TCPServer.__init__(self, server_address,
 
2546
                                RequestHandlerClass,
 
2547
                                interface=interface,
 
2548
                                use_ipv6=use_ipv6,
 
2549
                                socketfd=socketfd)
 
2550
 
 
2551
    def server_activate(self):
 
2552
        if self.enabled:
 
2553
            return socketserver.TCPServer.server_activate(self)
 
2554
 
 
2555
    def enable(self):
 
2556
        self.enabled = True
 
2557
 
 
2558
    def add_pipe(self, parent_pipe, proc):
 
2559
        # Call "handle_ipc" for both data and EOF events
 
2560
        GLib.io_add_watch(
 
2561
            parent_pipe.fileno(),
 
2562
            GLib.IO_IN | GLib.IO_HUP,
 
2563
            functools.partial(self.handle_ipc,
 
2564
                              parent_pipe=parent_pipe,
 
2565
                              proc=proc))
 
2566
 
 
2567
    def handle_ipc(self, source, condition,
 
2568
                   parent_pipe=None,
 
2569
                   proc=None,
 
2570
                   client_object=None):
 
2571
        # error, or the other end of multiprocessing.Pipe has closed
 
2572
        if condition & (GLib.IO_ERR | GLib.IO_HUP):
 
2573
            # Wait for other process to exit
 
2574
            proc.join()
 
2575
            return False
 
2576
 
 
2577
        # Read a request from the child
 
2578
        request = parent_pipe.recv()
 
2579
        command = request[0]
 
2580
 
 
2581
        if command == 'init':
 
2582
            fpr = request[1].decode("ascii")
 
2583
            address = request[2]
 
2584
 
 
2585
            for c in self.clients.values():
 
2586
                if c.fingerprint == fpr:
 
2587
                    client = c
 
2588
                    break
 
2589
            else:
 
2590
                logger.info("Client not found for fingerprint: %s, ad"
 
2591
                            "dress: %s", fpr, address)
 
2592
                if self.use_dbus:
 
2593
                    # Emit D-Bus signal
 
2594
                    mandos_dbus_service.ClientNotFound(fpr,
 
2595
                                                       address[0])
 
2596
                parent_pipe.send(False)
 
2597
                return False
 
2598
 
 
2599
            GLib.io_add_watch(
 
2600
                parent_pipe.fileno(),
 
2601
                GLib.IO_IN | GLib.IO_HUP,
 
2602
                functools.partial(self.handle_ipc,
 
2603
                                  parent_pipe=parent_pipe,
 
2604
                                  proc=proc,
 
2605
                                  client_object=client))
 
2606
            parent_pipe.send(True)
 
2607
            # remove the old hook in favor of the new above hook on
 
2608
            # same fileno
 
2609
            return False
 
2610
        if command == 'funcall':
 
2611
            funcname = request[1]
 
2612
            args = request[2]
 
2613
            kwargs = request[3]
 
2614
 
 
2615
            parent_pipe.send(('data', getattr(client_object,
 
2616
                                              funcname)(*args,
 
2617
                                                        **kwargs)))
 
2618
 
 
2619
        if command == 'getattr':
 
2620
            attrname = request[1]
 
2621
            if isinstance(client_object.__getattribute__(attrname),
 
2622
                          collections.Callable):
 
2623
                parent_pipe.send(('function', ))
 
2624
            else:
 
2625
                parent_pipe.send((
 
2626
                    'data', client_object.__getattribute__(attrname)))
 
2627
 
 
2628
        if command == 'setattr':
 
2629
            attrname = request[1]
 
2630
            value = request[2]
 
2631
            setattr(client_object, attrname, value)
 
2632
 
 
2633
        return True
 
2634
 
 
2635
 
 
2636
def rfc3339_duration_to_delta(duration):
 
2637
    """Parse an RFC 3339 "duration" and return a datetime.timedelta
 
2638
 
 
2639
    >>> rfc3339_duration_to_delta("P7D")
 
2640
    datetime.timedelta(7)
 
2641
    >>> rfc3339_duration_to_delta("PT60S")
 
2642
    datetime.timedelta(0, 60)
 
2643
    >>> rfc3339_duration_to_delta("PT60M")
 
2644
    datetime.timedelta(0, 3600)
 
2645
    >>> rfc3339_duration_to_delta("PT24H")
 
2646
    datetime.timedelta(1)
 
2647
    >>> rfc3339_duration_to_delta("P1W")
 
2648
    datetime.timedelta(7)
 
2649
    >>> rfc3339_duration_to_delta("PT5M30S")
 
2650
    datetime.timedelta(0, 330)
 
2651
    >>> rfc3339_duration_to_delta("P1DT3M20S")
 
2652
    datetime.timedelta(1, 200)
 
2653
    """
 
2654
 
 
2655
    # Parsing an RFC 3339 duration with regular expressions is not
 
2656
    # possible - there would have to be multiple places for the same
 
2657
    # values, like seconds.  The current code, while more esoteric, is
 
2658
    # cleaner without depending on a parsing library.  If Python had a
 
2659
    # built-in library for parsing we would use it, but we'd like to
 
2660
    # avoid excessive use of external libraries.
 
2661
 
 
2662
    # New type for defining tokens, syntax, and semantics all-in-one
 
2663
    Token = collections.namedtuple("Token", (
 
2664
        "regexp",  # To match token; if "value" is not None, must have
 
2665
                   # a "group" containing digits
 
2666
        "value",   # datetime.timedelta or None
 
2667
        "followers"))           # Tokens valid after this token
 
2668
    # RFC 3339 "duration" tokens, syntax, and semantics; taken from
 
2669
    # the "duration" ABNF definition in RFC 3339, Appendix A.
 
2670
    token_end = Token(re.compile(r"$"), None, frozenset())
 
2671
    token_second = Token(re.compile(r"(\d+)S"),
 
2672
                         datetime.timedelta(seconds=1),
 
2673
                         frozenset((token_end, )))
 
2674
    token_minute = Token(re.compile(r"(\d+)M"),
 
2675
                         datetime.timedelta(minutes=1),
 
2676
                         frozenset((token_second, token_end)))
 
2677
    token_hour = Token(re.compile(r"(\d+)H"),
 
2678
                       datetime.timedelta(hours=1),
 
2679
                       frozenset((token_minute, token_end)))
 
2680
    token_time = Token(re.compile(r"T"),
 
2681
                       None,
 
2682
                       frozenset((token_hour, token_minute,
 
2683
                                  token_second)))
 
2684
    token_day = Token(re.compile(r"(\d+)D"),
 
2685
                      datetime.timedelta(days=1),
 
2686
                      frozenset((token_time, token_end)))
 
2687
    token_month = Token(re.compile(r"(\d+)M"),
 
2688
                        datetime.timedelta(weeks=4),
 
2689
                        frozenset((token_day, token_end)))
 
2690
    token_year = Token(re.compile(r"(\d+)Y"),
 
2691
                       datetime.timedelta(weeks=52),
 
2692
                       frozenset((token_month, token_end)))
 
2693
    token_week = Token(re.compile(r"(\d+)W"),
 
2694
                       datetime.timedelta(weeks=1),
 
2695
                       frozenset((token_end, )))
 
2696
    token_duration = Token(re.compile(r"P"), None,
 
2697
                           frozenset((token_year, token_month,
 
2698
                                      token_day, token_time,
 
2699
                                      token_week)))
 
2700
    # Define starting values:
 
2701
    # Value so far
 
2702
    value = datetime.timedelta()
 
2703
    found_token = None
 
2704
    # Following valid tokens
 
2705
    followers = frozenset((token_duration, ))
 
2706
    # String left to parse
 
2707
    s = duration
 
2708
    # Loop until end token is found
 
2709
    while found_token is not token_end:
 
2710
        # Search for any currently valid tokens
 
2711
        for token in followers:
 
2712
            match = token.regexp.match(s)
 
2713
            if match is not None:
 
2714
                # Token found
 
2715
                if token.value is not None:
 
2716
                    # Value found, parse digits
 
2717
                    factor = int(match.group(1), 10)
 
2718
                    # Add to value so far
 
2719
                    value += factor * token.value
 
2720
                # Strip token from string
 
2721
                s = token.regexp.sub("", s, 1)
 
2722
                # Go to found token
 
2723
                found_token = token
 
2724
                # Set valid next tokens
 
2725
                followers = found_token.followers
 
2726
                break
 
2727
        else:
 
2728
            # No currently valid tokens were found
 
2729
            raise ValueError("Invalid RFC 3339 duration: {!r}"
 
2730
                             .format(duration))
 
2731
    # End token found
 
2732
    return value
565
2733
 
566
2734
 
567
2735
def string_to_delta(interval):
575
2743
    datetime.timedelta(0, 3600)
576
2744
    >>> string_to_delta('24h')
577
2745
    datetime.timedelta(1)
578
 
    >>> string_to_delta(u'1w')
 
2746
    >>> string_to_delta('1w')
579
2747
    datetime.timedelta(7)
580
2748
    >>> string_to_delta('5m 30s')
581
2749
    datetime.timedelta(0, 330)
582
2750
    """
 
2751
 
 
2752
    try:
 
2753
        return rfc3339_duration_to_delta(interval)
 
2754
    except ValueError:
 
2755
        pass
 
2756
 
583
2757
    timevalue = datetime.timedelta(0)
584
2758
    for s in interval.split():
585
2759
        try:
586
 
            suffix=unicode(s[-1])
587
 
            value=int(s[:-1])
588
 
            if suffix == u"d":
 
2760
            suffix = s[-1]
 
2761
            value = int(s[:-1])
 
2762
            if suffix == "d":
589
2763
                delta = datetime.timedelta(value)
590
 
            elif suffix == u"s":
 
2764
            elif suffix == "s":
591
2765
                delta = datetime.timedelta(0, value)
592
 
            elif suffix == u"m":
 
2766
            elif suffix == "m":
593
2767
                delta = datetime.timedelta(0, 0, 0, 0, value)
594
 
            elif suffix == u"h":
 
2768
            elif suffix == "h":
595
2769
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
596
 
            elif suffix == u"w":
 
2770
            elif suffix == "w":
597
2771
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
598
2772
            else:
599
 
                raise ValueError
600
 
        except (ValueError, IndexError):
601
 
            raise ValueError
 
2773
                raise ValueError("Unknown suffix {!r}".format(suffix))
 
2774
        except IndexError as e:
 
2775
            raise ValueError(*(e.args))
602
2776
        timevalue += delta
603
2777
    return timevalue
604
2778
 
605
2779
 
606
 
def server_state_changed(state):
607
 
    """Derived from the Avahi example code"""
608
 
    if state == avahi.SERVER_COLLISION:
609
 
        logger.error(u"Zeroconf server name collision")
610
 
        service.remove()
611
 
    elif state == avahi.SERVER_RUNNING:
612
 
        service.add()
613
 
 
614
 
 
615
 
def entry_group_state_changed(state, error):
616
 
    """Derived from the Avahi example code"""
617
 
    logger.debug(u"Avahi state change: %i", state)
618
 
    
619
 
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
620
 
        logger.debug(u"Zeroconf service established.")
621
 
    elif state == avahi.ENTRY_GROUP_COLLISION:
622
 
        logger.warning(u"Zeroconf service name collision.")
623
 
        service.rename()
624
 
    elif state == avahi.ENTRY_GROUP_FAILURE:
625
 
        logger.critical(u"Avahi: Error in group state changed %s",
626
 
                        unicode(error))
627
 
        raise AvahiGroupError("State changed: %s", str(error))
628
 
 
629
 
def if_nametoindex(interface):
630
 
    """Call the C function if_nametoindex(), or equivalent"""
631
 
    global if_nametoindex
632
 
    try:
633
 
        if "ctypes.util" not in sys.modules:
634
 
            import ctypes.util
635
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
636
 
            (ctypes.util.find_library("c")).if_nametoindex
637
 
    except (OSError, AttributeError):
638
 
        if "struct" not in sys.modules:
639
 
            import struct
640
 
        if "fcntl" not in sys.modules:
641
 
            import fcntl
642
 
        def if_nametoindex(interface):
643
 
            "Get an interface index the hard way, i.e. using fcntl()"
644
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
645
 
            s = socket.socket()
646
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
647
 
                                struct.pack("16s16x", interface))
648
 
            s.close()
649
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
650
 
            return interface_index
651
 
    return if_nametoindex(interface)
652
 
 
653
 
 
654
 
def daemon(nochdir = False, noclose = False):
 
2780
def daemon(nochdir=False, noclose=False):
655
2781
    """See daemon(3).  Standard BSD Unix function.
 
2782
 
656
2783
    This should really exist as os.daemon, but it doesn't (yet)."""
657
2784
    if os.fork():
658
2785
        sys.exit()
663
2790
        sys.exit()
664
2791
    if not noclose:
665
2792
        # Close all standard open file descriptors
666
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
2793
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
667
2794
        if not stat.S_ISCHR(os.fstat(null).st_mode):
668
2795
            raise OSError(errno.ENODEV,
669
 
                          "/dev/null not a character device")
 
2796
                          "{} not a character device"
 
2797
                          .format(os.devnull))
670
2798
        os.dup2(null, sys.stdin.fileno())
671
2799
        os.dup2(null, sys.stdout.fileno())
672
2800
        os.dup2(null, sys.stderr.fileno())
675
2803
 
676
2804
 
677
2805
def main():
678
 
    global main_loop_started
679
 
    main_loop_started = False
680
 
    
681
 
    parser = OptionParser(version = "%%prog %s" % version)
682
 
    parser.add_option("-i", "--interface", type="string",
683
 
                      metavar="IF", help="Bind to interface IF")
684
 
    parser.add_option("-a", "--address", type="string",
685
 
                      help="Address to listen for requests on")
686
 
    parser.add_option("-p", "--port", type="int",
687
 
                      help="Port number to receive requests on")
688
 
    parser.add_option("--check", action="store_true", default=False,
689
 
                      help="Run self-test")
690
 
    parser.add_option("--debug", action="store_true",
691
 
                      help="Debug mode; run in foreground and log to"
692
 
                      " terminal")
693
 
    parser.add_option("--priority", type="string", help="GnuTLS"
694
 
                      " priority string (see GnuTLS documentation)")
695
 
    parser.add_option("--servicename", type="string", metavar="NAME",
696
 
                      help="Zeroconf service name")
697
 
    parser.add_option("--configdir", type="string",
698
 
                      default="/etc/mandos", metavar="DIR",
699
 
                      help="Directory to search for configuration"
700
 
                      " files")
701
 
    (options, args) = parser.parse_args()
702
 
    
 
2806
 
 
2807
    ##################################################################
 
2808
    # Parsing of options, both command line and config file
 
2809
 
 
2810
    parser = argparse.ArgumentParser()
 
2811
    parser.add_argument("-v", "--version", action="version",
 
2812
                        version="%(prog)s {}".format(version),
 
2813
                        help="show version number and exit")
 
2814
    parser.add_argument("-i", "--interface", metavar="IF",
 
2815
                        help="Bind to interface IF")
 
2816
    parser.add_argument("-a", "--address",
 
2817
                        help="Address to listen for requests on")
 
2818
    parser.add_argument("-p", "--port", type=int,
 
2819
                        help="Port number to receive requests on")
 
2820
    parser.add_argument("--check", action="store_true",
 
2821
                        help="Run self-test")
 
2822
    parser.add_argument("--debug", action="store_true",
 
2823
                        help="Debug mode; run in foreground and log"
 
2824
                        " to terminal", default=None)
 
2825
    parser.add_argument("--debuglevel", metavar="LEVEL",
 
2826
                        help="Debug level for stdout output")
 
2827
    parser.add_argument("--priority", help="GnuTLS"
 
2828
                        " priority string (see GnuTLS documentation)")
 
2829
    parser.add_argument("--servicename",
 
2830
                        metavar="NAME", help="Zeroconf service name")
 
2831
    parser.add_argument("--configdir",
 
2832
                        default="/etc/mandos", metavar="DIR",
 
2833
                        help="Directory to search for configuration"
 
2834
                        " files")
 
2835
    parser.add_argument("--no-dbus", action="store_false",
 
2836
                        dest="use_dbus", help="Do not provide D-Bus"
 
2837
                        " system bus interface", default=None)
 
2838
    parser.add_argument("--no-ipv6", action="store_false",
 
2839
                        dest="use_ipv6", help="Do not use IPv6",
 
2840
                        default=None)
 
2841
    parser.add_argument("--no-restore", action="store_false",
 
2842
                        dest="restore", help="Do not restore stored"
 
2843
                        " state", default=None)
 
2844
    parser.add_argument("--socket", type=int,
 
2845
                        help="Specify a file descriptor to a network"
 
2846
                        " socket to use instead of creating one")
 
2847
    parser.add_argument("--statedir", metavar="DIR",
 
2848
                        help="Directory to save/restore state in")
 
2849
    parser.add_argument("--foreground", action="store_true",
 
2850
                        help="Run in foreground", default=None)
 
2851
    parser.add_argument("--no-zeroconf", action="store_false",
 
2852
                        dest="zeroconf", help="Do not use Zeroconf",
 
2853
                        default=None)
 
2854
 
 
2855
    options = parser.parse_args()
 
2856
 
703
2857
    if options.check:
704
2858
        import doctest
705
 
        doctest.testmod()
706
 
        sys.exit()
707
 
    
 
2859
        fail_count, test_count = doctest.testmod()
 
2860
        sys.exit(os.EX_OK if fail_count == 0 else 1)
 
2861
 
708
2862
    # Default values for config file for server-global settings
709
 
    server_defaults = { "interface": "",
710
 
                        "address": "",
711
 
                        "port": "",
712
 
                        "debug": "False",
713
 
                        "priority":
714
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
715
 
                        "servicename": "Mandos",
716
 
                        }
717
 
    
 
2863
    server_defaults = {"interface": "",
 
2864
                       "address": "",
 
2865
                       "port": "",
 
2866
                       "debug": "False",
 
2867
                       "priority":
 
2868
                       "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"
 
2869
                       ":+SIGN-DSA-SHA256",
 
2870
                       "servicename": "Mandos",
 
2871
                       "use_dbus": "True",
 
2872
                       "use_ipv6": "True",
 
2873
                       "debuglevel": "",
 
2874
                       "restore": "True",
 
2875
                       "socket": "",
 
2876
                       "statedir": "/var/lib/mandos",
 
2877
                       "foreground": "False",
 
2878
                       "zeroconf": "True",
 
2879
                       }
 
2880
 
718
2881
    # Parse config file for server-global settings
719
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
2882
    server_config = configparser.SafeConfigParser(server_defaults)
720
2883
    del server_defaults
721
2884
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
722
2885
    # Convert the SafeConfigParser object to a dict
723
2886
    server_settings = server_config.defaults()
724
 
    # Use getboolean on the boolean config option
725
 
    server_settings["debug"] = server_config.getboolean\
726
 
                               ("DEFAULT", "debug")
 
2887
    # Use the appropriate methods on the non-string config options
 
2888
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
 
2889
                   "foreground", "zeroconf"):
 
2890
        server_settings[option] = server_config.getboolean("DEFAULT",
 
2891
                                                           option)
 
2892
    if server_settings["port"]:
 
2893
        server_settings["port"] = server_config.getint("DEFAULT",
 
2894
                                                       "port")
 
2895
    if server_settings["socket"]:
 
2896
        server_settings["socket"] = server_config.getint("DEFAULT",
 
2897
                                                         "socket")
 
2898
        # Later, stdin will, and stdout and stderr might, be dup'ed
 
2899
        # over with an opened os.devnull.  But we don't want this to
 
2900
        # happen with a supplied network socket.
 
2901
        if 0 <= server_settings["socket"] <= 2:
 
2902
            server_settings["socket"] = os.dup(server_settings
 
2903
                                               ["socket"])
727
2904
    del server_config
728
 
    
 
2905
 
729
2906
    # Override the settings from the config file with command line
730
2907
    # options, if set.
731
2908
    for option in ("interface", "address", "port", "debug",
732
 
                   "priority", "servicename", "configdir"):
 
2909
                   "priority", "servicename", "configdir", "use_dbus",
 
2910
                   "use_ipv6", "debuglevel", "restore", "statedir",
 
2911
                   "socket", "foreground", "zeroconf"):
733
2912
        value = getattr(options, option)
734
2913
        if value is not None:
735
2914
            server_settings[option] = value
736
2915
    del options
 
2916
    # Force all strings to be unicode
 
2917
    for option in server_settings.keys():
 
2918
        if isinstance(server_settings[option], bytes):
 
2919
            server_settings[option] = (server_settings[option]
 
2920
                                       .decode("utf-8"))
 
2921
    # Force all boolean options to be boolean
 
2922
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
 
2923
                   "foreground", "zeroconf"):
 
2924
        server_settings[option] = bool(server_settings[option])
 
2925
    # Debug implies foreground
 
2926
    if server_settings["debug"]:
 
2927
        server_settings["foreground"] = True
737
2928
    # Now we have our good server settings in "server_settings"
738
 
    
 
2929
 
 
2930
    ##################################################################
 
2931
 
 
2932
    if (not server_settings["zeroconf"]
 
2933
        and not (server_settings["port"]
 
2934
                 or server_settings["socket"] != "")):
 
2935
        parser.error("Needs port or socket to work without Zeroconf")
 
2936
 
 
2937
    # For convenience
739
2938
    debug = server_settings["debug"]
740
 
    
741
 
    if not debug:
742
 
        syslogger.setLevel(logging.WARNING)
743
 
        console.setLevel(logging.WARNING)
744
 
    
 
2939
    debuglevel = server_settings["debuglevel"]
 
2940
    use_dbus = server_settings["use_dbus"]
 
2941
    use_ipv6 = server_settings["use_ipv6"]
 
2942
    stored_state_path = os.path.join(server_settings["statedir"],
 
2943
                                     stored_state_file)
 
2944
    foreground = server_settings["foreground"]
 
2945
    zeroconf = server_settings["zeroconf"]
 
2946
 
 
2947
    if debug:
 
2948
        initlogger(debug, logging.DEBUG)
 
2949
    else:
 
2950
        if not debuglevel:
 
2951
            initlogger(debug)
 
2952
        else:
 
2953
            level = getattr(logging, debuglevel.upper())
 
2954
            initlogger(debug, level)
 
2955
 
745
2956
    if server_settings["servicename"] != "Mandos":
746
 
        syslogger.setFormatter(logging.Formatter\
747
 
                               ('Mandos (%s): %%(levelname)s:'
748
 
                                ' %%(message)s'
749
 
                                % server_settings["servicename"]))
750
 
    
 
2957
        syslogger.setFormatter(
 
2958
            logging.Formatter('Mandos ({}) [%(process)d]:'
 
2959
                              ' %(levelname)s: %(message)s'.format(
 
2960
                                  server_settings["servicename"])))
 
2961
 
751
2962
    # Parse config file with clients
752
 
    client_defaults = { "timeout": "1h",
753
 
                        "interval": "5m",
754
 
                        "checker": "fping -q -- %(host)s",
755
 
                        "host": "",
756
 
                        }
757
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
 
2963
    client_config = configparser.SafeConfigParser(Client
 
2964
                                                  .client_defaults)
758
2965
    client_config.read(os.path.join(server_settings["configdir"],
759
2966
                                    "clients.conf"))
760
 
    
761
 
    global service
762
 
    service = AvahiService(name = server_settings["servicename"],
763
 
                           type = "_mandos._tcp", );
764
 
    if server_settings["interface"]:
765
 
        service.interface = if_nametoindex\
766
 
                            (server_settings["interface"])
767
 
    
 
2967
 
 
2968
    global mandos_dbus_service
 
2969
    mandos_dbus_service = None
 
2970
 
 
2971
    socketfd = None
 
2972
    if server_settings["socket"] != "":
 
2973
        socketfd = server_settings["socket"]
 
2974
    tcp_server = MandosServer(
 
2975
        (server_settings["address"], server_settings["port"]),
 
2976
        ClientHandler,
 
2977
        interface=(server_settings["interface"] or None),
 
2978
        use_ipv6=use_ipv6,
 
2979
        gnutls_priority=server_settings["priority"],
 
2980
        use_dbus=use_dbus,
 
2981
        socketfd=socketfd)
 
2982
    if not foreground:
 
2983
        pidfilename = "/run/mandos.pid"
 
2984
        if not os.path.isdir("/run/."):
 
2985
            pidfilename = "/var/run/mandos.pid"
 
2986
        pidfile = None
 
2987
        try:
 
2988
            pidfile = codecs.open(pidfilename, "w", encoding="utf-8")
 
2989
        except IOError as e:
 
2990
            logger.error("Could not open file %r", pidfilename,
 
2991
                         exc_info=e)
 
2992
 
 
2993
    for name, group in (("_mandos", "_mandos"),
 
2994
                        ("mandos", "mandos"),
 
2995
                        ("nobody", "nogroup")):
 
2996
        try:
 
2997
            uid = pwd.getpwnam(name).pw_uid
 
2998
            gid = pwd.getpwnam(group).pw_gid
 
2999
            break
 
3000
        except KeyError:
 
3001
            continue
 
3002
    else:
 
3003
        uid = 65534
 
3004
        gid = 65534
 
3005
    try:
 
3006
        os.setgid(gid)
 
3007
        os.setuid(uid)
 
3008
        if debug:
 
3009
            logger.debug("Did setuid/setgid to {}:{}".format(uid,
 
3010
                                                             gid))
 
3011
    except OSError as error:
 
3012
        logger.warning("Failed to setuid/setgid to {}:{}: {}"
 
3013
                       .format(uid, gid, os.strerror(error.errno)))
 
3014
        if error.errno != errno.EPERM:
 
3015
            raise
 
3016
 
 
3017
    if debug:
 
3018
        # Enable all possible GnuTLS debugging
 
3019
 
 
3020
        # "Use a log level over 10 to enable all debugging options."
 
3021
        # - GnuTLS manual
 
3022
        gnutls.global_set_log_level(11)
 
3023
 
 
3024
        @gnutls.log_func
 
3025
        def debug_gnutls(level, string):
 
3026
            logger.debug("GnuTLS: %s", string[:-1])
 
3027
 
 
3028
        gnutls.global_set_log_function(debug_gnutls)
 
3029
 
 
3030
        # Redirect stdin so all checkers get /dev/null
 
3031
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
 
3032
        os.dup2(null, sys.stdin.fileno())
 
3033
        if null > 2:
 
3034
            os.close(null)
 
3035
 
 
3036
    # Need to fork before connecting to D-Bus
 
3037
    if not foreground:
 
3038
        # Close all input and output, do double fork, etc.
 
3039
        daemon()
 
3040
 
 
3041
    # multiprocessing will use threads, so before we use GLib we need
 
3042
    # to inform GLib that threads will be used.
 
3043
    GLib.threads_init()
 
3044
 
768
3045
    global main_loop
769
 
    global bus
770
 
    global server
771
3046
    # From the Avahi example code
772
 
    DBusGMainLoop(set_as_default=True )
773
 
    main_loop = gobject.MainLoop()
 
3047
    DBusGMainLoop(set_as_default=True)
 
3048
    main_loop = GLib.MainLoop()
774
3049
    bus = dbus.SystemBus()
775
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
776
 
                                           avahi.DBUS_PATH_SERVER),
777
 
                            avahi.DBUS_INTERFACE_SERVER)
778
3050
    # End of Avahi example code
779
 
    
780
 
    clients = Set()
781
 
    def remove_from_clients(client):
782
 
        clients.remove(client)
783
 
        if not clients:
784
 
            logger.critical(u"No clients left, exiting")
785
 
            sys.exit()
786
 
    
787
 
    clients.update(Set(Client(name = section,
788
 
                              stop_hook = remove_from_clients,
789
 
                              config
790
 
                              = dict(client_config.items(section)))
791
 
                       for section in client_config.sections()))
792
 
    if not clients:
793
 
        logger.critical(u"No clients defined")
794
 
        sys.exit(1)
795
 
    
796
 
    if debug:
797
 
        # Redirect stdin so all checkers get /dev/null
798
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
799
 
        os.dup2(null, sys.stdin.fileno())
800
 
        if null > 2:
801
 
            os.close(null)
802
 
    else:
803
 
        # No console logging
804
 
        logger.removeHandler(console)
805
 
        # Close all input and output, do double fork, etc.
806
 
        daemon()
807
 
    
808
 
    pidfilename = "/var/run/mandos/mandos.pid"
809
 
    pid = os.getpid()
810
 
    try:
811
 
        pidfile = open(pidfilename, "w")
812
 
        pidfile.write(str(pid) + "\n")
813
 
        pidfile.close()
 
3051
    if use_dbus:
 
3052
        try:
 
3053
            bus_name = dbus.service.BusName("se.recompile.Mandos",
 
3054
                                            bus,
 
3055
                                            do_not_queue=True)
 
3056
            old_bus_name = dbus.service.BusName(
 
3057
                "se.bsnet.fukt.Mandos", bus,
 
3058
                do_not_queue=True)
 
3059
        except dbus.exceptions.DBusException as e:
 
3060
            logger.error("Disabling D-Bus:", exc_info=e)
 
3061
            use_dbus = False
 
3062
            server_settings["use_dbus"] = False
 
3063
            tcp_server.use_dbus = False
 
3064
    if zeroconf:
 
3065
        protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
3066
        service = AvahiServiceToSyslog(
 
3067
            name=server_settings["servicename"],
 
3068
            servicetype="_mandos._tcp",
 
3069
            protocol=protocol,
 
3070
            bus=bus)
 
3071
        if server_settings["interface"]:
 
3072
            service.interface = if_nametoindex(
 
3073
                server_settings["interface"].encode("utf-8"))
 
3074
 
 
3075
    global multiprocessing_manager
 
3076
    multiprocessing_manager = multiprocessing.Manager()
 
3077
 
 
3078
    client_class = Client
 
3079
    if use_dbus:
 
3080
        client_class = functools.partial(ClientDBus, bus=bus)
 
3081
 
 
3082
    client_settings = Client.config_parser(client_config)
 
3083
    old_client_settings = {}
 
3084
    clients_data = {}
 
3085
 
 
3086
    # This is used to redirect stdout and stderr for checker processes
 
3087
    global wnull
 
3088
    wnull = open(os.devnull, "w")  # A writable /dev/null
 
3089
    # Only used if server is running in foreground but not in debug
 
3090
    # mode
 
3091
    if debug or not foreground:
 
3092
        wnull.close()
 
3093
 
 
3094
    # Get client data and settings from last running state.
 
3095
    if server_settings["restore"]:
 
3096
        try:
 
3097
            with open(stored_state_path, "rb") as stored_state:
 
3098
                if sys.version_info.major == 2:
 
3099
                    clients_data, old_client_settings = pickle.load(
 
3100
                        stored_state)
 
3101
                else:
 
3102
                    bytes_clients_data, bytes_old_client_settings = (
 
3103
                        pickle.load(stored_state, encoding="bytes"))
 
3104
                    #   Fix bytes to strings
 
3105
                    #  clients_data
 
3106
                    # .keys()
 
3107
                    clients_data = {(key.decode("utf-8")
 
3108
                                     if isinstance(key, bytes)
 
3109
                                     else key): value
 
3110
                                    for key, value in
 
3111
                                    bytes_clients_data.items()}
 
3112
                    del bytes_clients_data
 
3113
                    for key in clients_data:
 
3114
                        value = {(k.decode("utf-8")
 
3115
                                  if isinstance(k, bytes) else k): v
 
3116
                                 for k, v in
 
3117
                                 clients_data[key].items()}
 
3118
                        clients_data[key] = value
 
3119
                        # .client_structure
 
3120
                        value["client_structure"] = [
 
3121
                            (s.decode("utf-8")
 
3122
                             if isinstance(s, bytes)
 
3123
                             else s) for s in
 
3124
                            value["client_structure"]]
 
3125
                        # .name & .host
 
3126
                        for k in ("name", "host"):
 
3127
                            if isinstance(value[k], bytes):
 
3128
                                value[k] = value[k].decode("utf-8")
 
3129
                    #  old_client_settings
 
3130
                    # .keys()
 
3131
                    old_client_settings = {
 
3132
                        (key.decode("utf-8")
 
3133
                         if isinstance(key, bytes)
 
3134
                         else key): value
 
3135
                        for key, value in
 
3136
                        bytes_old_client_settings.items()}
 
3137
                    del bytes_old_client_settings
 
3138
                    # .host
 
3139
                    for value in old_client_settings.values():
 
3140
                        if isinstance(value["host"], bytes):
 
3141
                            value["host"] = (value["host"]
 
3142
                                             .decode("utf-8"))
 
3143
            os.remove(stored_state_path)
 
3144
        except IOError as e:
 
3145
            if e.errno == errno.ENOENT:
 
3146
                logger.warning("Could not load persistent state:"
 
3147
                               " {}".format(os.strerror(e.errno)))
 
3148
            else:
 
3149
                logger.critical("Could not load persistent state:",
 
3150
                                exc_info=e)
 
3151
                raise
 
3152
        except EOFError as e:
 
3153
            logger.warning("Could not load persistent state: "
 
3154
                           "EOFError:",
 
3155
                           exc_info=e)
 
3156
 
 
3157
    with PGPEngine() as pgp:
 
3158
        for client_name, client in clients_data.items():
 
3159
            # Skip removed clients
 
3160
            if client_name not in client_settings:
 
3161
                continue
 
3162
 
 
3163
            # Decide which value to use after restoring saved state.
 
3164
            # We have three different values: Old config file,
 
3165
            # new config file, and saved state.
 
3166
            # New config value takes precedence if it differs from old
 
3167
            # config value, otherwise use saved state.
 
3168
            for name, value in client_settings[client_name].items():
 
3169
                try:
 
3170
                    # For each value in new config, check if it
 
3171
                    # differs from the old config value (Except for
 
3172
                    # the "secret" attribute)
 
3173
                    if (name != "secret"
 
3174
                        and (value !=
 
3175
                             old_client_settings[client_name][name])):
 
3176
                        client[name] = value
 
3177
                except KeyError:
 
3178
                    pass
 
3179
 
 
3180
            # Clients who has passed its expire date can still be
 
3181
            # enabled if its last checker was successful.  A Client
 
3182
            # whose checker succeeded before we stored its state is
 
3183
            # assumed to have successfully run all checkers during
 
3184
            # downtime.
 
3185
            if client["enabled"]:
 
3186
                if datetime.datetime.utcnow() >= client["expires"]:
 
3187
                    if not client["last_checked_ok"]:
 
3188
                        logger.warning(
 
3189
                            "disabling client {} - Client never "
 
3190
                            "performed a successful checker".format(
 
3191
                                client_name))
 
3192
                        client["enabled"] = False
 
3193
                    elif client["last_checker_status"] != 0:
 
3194
                        logger.warning(
 
3195
                            "disabling client {} - Client last"
 
3196
                            " checker failed with error code"
 
3197
                            " {}".format(
 
3198
                                client_name,
 
3199
                                client["last_checker_status"]))
 
3200
                        client["enabled"] = False
 
3201
                    else:
 
3202
                        client["expires"] = (
 
3203
                            datetime.datetime.utcnow()
 
3204
                            + client["timeout"])
 
3205
                        logger.debug("Last checker succeeded,"
 
3206
                                     " keeping {} enabled".format(
 
3207
                                         client_name))
 
3208
            try:
 
3209
                client["secret"] = pgp.decrypt(
 
3210
                    client["encrypted_secret"],
 
3211
                    client_settings[client_name]["secret"])
 
3212
            except PGPError:
 
3213
                # If decryption fails, we use secret from new settings
 
3214
                logger.debug("Failed to decrypt {} old secret".format(
 
3215
                    client_name))
 
3216
                client["secret"] = (client_settings[client_name]
 
3217
                                    ["secret"])
 
3218
 
 
3219
    # Add/remove clients based on new changes made to config
 
3220
    for client_name in (set(old_client_settings)
 
3221
                        - set(client_settings)):
 
3222
        del clients_data[client_name]
 
3223
    for client_name in (set(client_settings)
 
3224
                        - set(old_client_settings)):
 
3225
        clients_data[client_name] = client_settings[client_name]
 
3226
 
 
3227
    # Create all client objects
 
3228
    for client_name, client in clients_data.items():
 
3229
        tcp_server.clients[client_name] = client_class(
 
3230
            name=client_name,
 
3231
            settings=client,
 
3232
            server_settings=server_settings)
 
3233
 
 
3234
    if not tcp_server.clients:
 
3235
        logger.warning("No clients defined")
 
3236
 
 
3237
    if not foreground:
 
3238
        if pidfile is not None:
 
3239
            pid = os.getpid()
 
3240
            try:
 
3241
                with pidfile:
 
3242
                    print(pid, file=pidfile)
 
3243
            except IOError:
 
3244
                logger.error("Could not write to file %r with PID %d",
 
3245
                             pidfilename, pid)
814
3246
        del pidfile
815
 
    except IOError, err:
816
 
        logger.error(u"Could not write %s file with PID %d",
817
 
                     pidfilename, os.getpid())
818
 
    
 
3247
        del pidfilename
 
3248
 
 
3249
    for termsig in (signal.SIGHUP, signal.SIGTERM):
 
3250
        GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,
 
3251
                             lambda: main_loop.quit() and False)
 
3252
 
 
3253
    if use_dbus:
 
3254
 
 
3255
        @alternate_dbus_interfaces(
 
3256
            {"se.recompile.Mandos": "se.bsnet.fukt.Mandos"})
 
3257
        class MandosDBusService(DBusObjectWithObjectManager):
 
3258
            """A D-Bus proxy object"""
 
3259
 
 
3260
            def __init__(self):
 
3261
                dbus.service.Object.__init__(self, bus, "/")
 
3262
 
 
3263
            _interface = "se.recompile.Mandos"
 
3264
 
 
3265
            @dbus.service.signal(_interface, signature="o")
 
3266
            def ClientAdded(self, objpath):
 
3267
                "D-Bus signal"
 
3268
                pass
 
3269
 
 
3270
            @dbus.service.signal(_interface, signature="ss")
 
3271
            def ClientNotFound(self, fingerprint, address):
 
3272
                "D-Bus signal"
 
3273
                pass
 
3274
 
 
3275
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
 
3276
                               "true"})
 
3277
            @dbus.service.signal(_interface, signature="os")
 
3278
            def ClientRemoved(self, objpath, name):
 
3279
                "D-Bus signal"
 
3280
                pass
 
3281
 
 
3282
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
 
3283
                               "true"})
 
3284
            @dbus.service.method(_interface, out_signature="ao")
 
3285
            def GetAllClients(self):
 
3286
                "D-Bus method"
 
3287
                return dbus.Array(c.dbus_object_path for c in
 
3288
                                  tcp_server.clients.values())
 
3289
 
 
3290
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
 
3291
                               "true"})
 
3292
            @dbus.service.method(_interface,
 
3293
                                 out_signature="a{oa{sv}}")
 
3294
            def GetAllClientsWithProperties(self):
 
3295
                "D-Bus method"
 
3296
                return dbus.Dictionary(
 
3297
                    {c.dbus_object_path: c.GetAll(
 
3298
                        "se.recompile.Mandos.Client")
 
3299
                     for c in tcp_server.clients.values()},
 
3300
                    signature="oa{sv}")
 
3301
 
 
3302
            @dbus.service.method(_interface, in_signature="o")
 
3303
            def RemoveClient(self, object_path):
 
3304
                "D-Bus method"
 
3305
                for c in tcp_server.clients.values():
 
3306
                    if c.dbus_object_path == object_path:
 
3307
                        del tcp_server.clients[c.name]
 
3308
                        c.remove_from_connection()
 
3309
                        # Don't signal the disabling
 
3310
                        c.disable(quiet=True)
 
3311
                        # Emit D-Bus signal for removal
 
3312
                        self.client_removed_signal(c)
 
3313
                        return
 
3314
                raise KeyError(object_path)
 
3315
 
 
3316
            del _interface
 
3317
 
 
3318
            @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
 
3319
                                 out_signature="a{oa{sa{sv}}}")
 
3320
            def GetManagedObjects(self):
 
3321
                """D-Bus method"""
 
3322
                return dbus.Dictionary(
 
3323
                    {client.dbus_object_path:
 
3324
                     dbus.Dictionary(
 
3325
                         {interface: client.GetAll(interface)
 
3326
                          for interface in
 
3327
                          client._get_all_interface_names()})
 
3328
                     for client in tcp_server.clients.values()})
 
3329
 
 
3330
            def client_added_signal(self, client):
 
3331
                """Send the new standard signal and the old signal"""
 
3332
                if use_dbus:
 
3333
                    # New standard signal
 
3334
                    self.InterfacesAdded(
 
3335
                        client.dbus_object_path,
 
3336
                        dbus.Dictionary(
 
3337
                            {interface: client.GetAll(interface)
 
3338
                             for interface in
 
3339
                             client._get_all_interface_names()}))
 
3340
                    # Old signal
 
3341
                    self.ClientAdded(client.dbus_object_path)
 
3342
 
 
3343
            def client_removed_signal(self, client):
 
3344
                """Send the new standard signal and the old signal"""
 
3345
                if use_dbus:
 
3346
                    # New standard signal
 
3347
                    self.InterfacesRemoved(
 
3348
                        client.dbus_object_path,
 
3349
                        client._get_all_interface_names())
 
3350
                    # Old signal
 
3351
                    self.ClientRemoved(client.dbus_object_path,
 
3352
                                       client.name)
 
3353
 
 
3354
        mandos_dbus_service = MandosDBusService()
 
3355
 
 
3356
    # Save modules to variables to exempt the modules from being
 
3357
    # unloaded before the function registered with atexit() is run.
 
3358
    mp = multiprocessing
 
3359
    wn = wnull
 
3360
 
819
3361
    def cleanup():
820
3362
        "Cleanup function; run on exit"
821
 
        global group
822
 
        # From the Avahi example code
823
 
        if not group is None:
824
 
            group.Free()
825
 
            group = None
826
 
        # End of Avahi example code
827
 
        
828
 
        while clients:
829
 
            client = clients.pop()
830
 
            client.stop_hook = None
831
 
            client.stop()
832
 
    
 
3363
        if zeroconf:
 
3364
            service.cleanup()
 
3365
 
 
3366
        mp.active_children()
 
3367
        wn.close()
 
3368
        if not (tcp_server.clients or client_settings):
 
3369
            return
 
3370
 
 
3371
        # Store client before exiting. Secrets are encrypted with key
 
3372
        # based on what config file has. If config file is
 
3373
        # removed/edited, old secret will thus be unrecovable.
 
3374
        clients = {}
 
3375
        with PGPEngine() as pgp:
 
3376
            for client in tcp_server.clients.values():
 
3377
                key = client_settings[client.name]["secret"]
 
3378
                client.encrypted_secret = pgp.encrypt(client.secret,
 
3379
                                                      key)
 
3380
                client_dict = {}
 
3381
 
 
3382
                # A list of attributes that can not be pickled
 
3383
                # + secret.
 
3384
                exclude = {"bus", "changedstate", "secret",
 
3385
                           "checker", "server_settings"}
 
3386
                for name, typ in inspect.getmembers(dbus.service
 
3387
                                                    .Object):
 
3388
                    exclude.add(name)
 
3389
 
 
3390
                client_dict["encrypted_secret"] = (client
 
3391
                                                   .encrypted_secret)
 
3392
                for attr in client.client_structure:
 
3393
                    if attr not in exclude:
 
3394
                        client_dict[attr] = getattr(client, attr)
 
3395
 
 
3396
                clients[client.name] = client_dict
 
3397
                del client_settings[client.name]["secret"]
 
3398
 
 
3399
        try:
 
3400
            with tempfile.NamedTemporaryFile(
 
3401
                    mode='wb',
 
3402
                    suffix=".pickle",
 
3403
                    prefix='clients-',
 
3404
                    dir=os.path.dirname(stored_state_path),
 
3405
                    delete=False) as stored_state:
 
3406
                pickle.dump((clients, client_settings), stored_state,
 
3407
                            protocol=2)
 
3408
                tempname = stored_state.name
 
3409
            os.rename(tempname, stored_state_path)
 
3410
        except (IOError, OSError) as e:
 
3411
            if not debug:
 
3412
                try:
 
3413
                    os.remove(tempname)
 
3414
                except NameError:
 
3415
                    pass
 
3416
            if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
 
3417
                logger.warning("Could not save persistent state: {}"
 
3418
                               .format(os.strerror(e.errno)))
 
3419
            else:
 
3420
                logger.warning("Could not save persistent state:",
 
3421
                               exc_info=e)
 
3422
                raise
 
3423
 
 
3424
        # Delete all clients, and settings from config
 
3425
        while tcp_server.clients:
 
3426
            name, client = tcp_server.clients.popitem()
 
3427
            if use_dbus:
 
3428
                client.remove_from_connection()
 
3429
            # Don't signal the disabling
 
3430
            client.disable(quiet=True)
 
3431
            # Emit D-Bus signal for removal
 
3432
            if use_dbus:
 
3433
                mandos_dbus_service.client_removed_signal(client)
 
3434
        client_settings.clear()
 
3435
 
833
3436
    atexit.register(cleanup)
834
 
    
835
 
    if not debug:
836
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
837
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
838
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
839
 
    
840
 
    for client in clients:
841
 
        client.start()
842
 
    
843
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
844
 
                                 server_settings["port"]),
845
 
                                tcp_handler,
846
 
                                settings=server_settings,
847
 
                                clients=clients)
 
3437
 
 
3438
    for client in tcp_server.clients.values():
 
3439
        if use_dbus:
 
3440
            # Emit D-Bus signal for adding
 
3441
            mandos_dbus_service.client_added_signal(client)
 
3442
        # Need to initiate checking of clients
 
3443
        if client.enabled:
 
3444
            client.init_checker()
 
3445
 
 
3446
    tcp_server.enable()
 
3447
    tcp_server.server_activate()
 
3448
 
848
3449
    # Find out what port we got
849
 
    service.port = tcp_server.socket.getsockname()[1]
850
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
851
 
                u" scope_id %d" % tcp_server.socket.getsockname())
852
 
    
853
 
    #service.interface = tcp_server.socket.getsockname()[3]
854
 
    
 
3450
    if zeroconf:
 
3451
        service.port = tcp_server.socket.getsockname()[1]
 
3452
    if use_ipv6:
 
3453
        logger.info("Now listening on address %r, port %d,"
 
3454
                    " flowinfo %d, scope_id %d",
 
3455
                    *tcp_server.socket.getsockname())
 
3456
    else:                       # IPv4
 
3457
        logger.info("Now listening on address %r, port %d",
 
3458
                    *tcp_server.socket.getsockname())
 
3459
 
 
3460
    # service.interface = tcp_server.socket.getsockname()[3]
 
3461
 
855
3462
    try:
856
 
        # From the Avahi example code
857
 
        server.connect_to_signal("StateChanged", server_state_changed)
858
 
        try:
859
 
            server_state_changed(server.GetState())
860
 
        except dbus.exceptions.DBusException, error:
861
 
            logger.critical(u"DBusException: %s", error)
862
 
            sys.exit(1)
863
 
        # End of Avahi example code
864
 
        
865
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
866
 
                             lambda *args, **kwargs:
867
 
                             tcp_server.handle_request\
868
 
                             (*args[2:], **kwargs) or True)
869
 
        
870
 
        logger.debug(u"Starting main loop")
871
 
        main_loop_started = True
 
3463
        if zeroconf:
 
3464
            # From the Avahi example code
 
3465
            try:
 
3466
                service.activate()
 
3467
            except dbus.exceptions.DBusException as error:
 
3468
                logger.critical("D-Bus Exception", exc_info=error)
 
3469
                cleanup()
 
3470
                sys.exit(1)
 
3471
            # End of Avahi example code
 
3472
 
 
3473
        GLib.io_add_watch(tcp_server.fileno(), GLib.IO_IN,
 
3474
                          lambda *args, **kwargs:
 
3475
                          (tcp_server.handle_request
 
3476
                           (*args[2:], **kwargs) or True))
 
3477
 
 
3478
        logger.debug("Starting main loop")
872
3479
        main_loop.run()
873
 
    except AvahiError, error:
874
 
        logger.critical(u"AvahiError: %s" + unicode(error))
 
3480
    except AvahiError as error:
 
3481
        logger.critical("Avahi Error", exc_info=error)
 
3482
        cleanup()
875
3483
        sys.exit(1)
876
3484
    except KeyboardInterrupt:
877
3485
        if debug:
878
 
            print
 
3486
            print("", file=sys.stderr)
 
3487
        logger.debug("Server received KeyboardInterrupt")
 
3488
    logger.debug("Server exiting")
 
3489
    # Must run before the D-Bus bus name gets deregistered
 
3490
    cleanup()
 
3491
 
879
3492
 
880
3493
if __name__ == '__main__':
881
3494
    main()