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  • Committer: Teddy Hogeborn
  • Date: 2019-02-09 23:23:26 UTC
  • Revision ID: teddy@recompile.se-20190209232326-z1z2kzpgfixz7iaj
Add support for using raw public keys in TLS (RFC 7250)

Since GnuTLS removed support for OpenPGP keys in TLS (RFC 6091), and
no other library supports it, we have to change the protocol to use
something else.  We choose to use "raw public keys" (RFC 7250).  Since
we still use OpenPGP keys to decrypt the secret password, this means
that each client will have two keys: One OpenPGP key and one TLS
public/private key, and the key ID of the latter key is used to
identify clients instead of the fingerprint of the OpenPGP key.

Note that this code is still compatible with GnuTLS before version
3.6.0 (when OpenPGP key support was removed).  This commit merely adds
support for using raw pulic keys instead with GnuTLS 3.6.6. or later.

* DBUS-API (Signals/ClientNotFound): Change name of first parameter
                                     from "Fingerprint" to "KeyID".
  (Mandos Client Interface/Properties/KeyID): New.
* INSTALL: Document conflict with GnuTLS 3.6.0 (which removed OpenPGP
           key support) up until 3.6.6, when support for raw public
           keys was added.  Also document new dependency of client on
           "gnutls-bin" package (for certtool).
* Makefile (run-client): Depend on TLS key files, and also pass them
                         as arguments to client.
  (keydir/tls-privkey.pem, keydir/tls-pubkey.pem): New.
  (confdir/clients.conf): Add dependency on TLS public key.
  (purge-client): Add removal of TLS key files.
* clients.conf ([foo]/key_id, [bar]/key_id): New.
* debian/control (Source: mandos/Build-Depends): Also allow
                                                 libgnutls30 (>= 3.6.6)
  (Package: mandos/Depends): - '' -
  (Package: mandos/Description): Alter description to match new
                                 design.
  (Package: mandos-client/Description): - '' -
  (Package: mandos-client/Depends): Move "gnutls-bin | openssl" to
                                    here from "Recommends".
* debian/mandos-client.README.Debian: Add --tls-privkey and
                                      --tls-pubkey options to test
                                      command.
* debian/mandos-client.postinst (create_key): Renamed to "create_keys"
                                             (all callers changed),
                                             and also create TLS key.
* debian/mandos-client.postrm (purge): Also remove TLS key files.
* intro.xml (DESCRIPTION): Describe new dual-key design.
* mandos (GnuTLS): Define different functions depending on whether
                   support for raw public keys is detected.
  (Client.key_id): New attribute.
  (ClientDBus.KeyID_dbus_property): New method.
  (ProxyClient.__init__): Take new "key_id" parameter.
  (ClientHandler.handle): Use key IDs when using raw public keys and
                          use fingerprints when using OpenPGP keys.
  (ClientHandler.peer_certificate): Also handle raw public keys.
  (ClientHandler.key_id): New.
  (MandosServer.handle_ipc): Pass key ID over the pipe IPC.  Also
                             check for key ID matches when looking up
                             clients.
  (main): Default GnuTLS priority string depends on whether we are
          using raw public keys or not.  When unpickling clients, set
          key_id if not set in the pickle.
  (main/MandosDBusService.ClientNotFound): Change name of first
                                           parameter from
                                           "Fingerprint" to "KeyID".
* mandos-clients.conf.xml (OPTIONS): Document new "key_id" option.
  (OPTIONS/secret): Mention new key ID matchning.
  (EXPANSION/RUNTIME EXPANSION): Add new "key_id" option.
  (EXAMPLE): - '' -
* mandos-ctl (tablewords, main/keywords): Add new "KeyID" property.
* mandos-keygen: Create TLS key files.  New "--tls-keytype" (-T)
                 option.  Alter help text to be more clear about key
                 types.  When in password mode, also output "key_id"
                 option.
* mandos-keygen.xml (SYNOPSIS): Add new "--tls-keytype" (-T) option.
  (DESCRIPTION): Alter to match new dual-key design.
  (OVERVIEW): - '' -
  (FILES): Add TLS key files.
* mandos-options.xml (priority): Document new default priority string
                                 when using raw public keys.
* mandos.xml (NETWORK PROTOCOL): Describe new protocol using key ID.
  (BUGS): Remove issue about checking expire times of OpenPGP keys,
          since TLS public keys do not have expiration times.
  (SECURITY/CLIENT): Alter description to match new design.
  (SEE ALSO/GnuTLS): - '' -
  (SEE ALSO): Add reference to RFC 7250, and alter description of when
              RFC 6091 is used.
* overview.xml: Alter text to match new design.
* plugin-runner.xml (EXAMPLE): Add --tls-pubkey and --tls-privkey
                               options to mandos-client options.
* plugins.d/mandos-client.c: Use raw public keys when compiling with
                             supporting GnuTLS versions. Add new
                             "--tls-pubkey" and "--tls-privkey"
                             options (which do nothing if GnuTLS
                             library does not support raw public
                             keys).  Alter text throughout to reflect
                             new design.  Only generate new DH
                             parameters (based on size of OpenPGP key)
                             when using OpenPGP in TLS.  Default
                             GnuTLS priority string depends on whether
                             we are using raw public keys or not.
* plugins.d/mandos-client.xml (SYNOPSIS): Add new "--tls-privkey" (-t)
                                          and "--tls-pubkey" (-T)
                                          options.
  (DESCRIPTION): Describe new dual-key design.
  (OPTIONS): Document new "--tls-privkey" (-t) and "--tls-pubkey" (-T)
             options.
  (OPTIONS/--dh-bits): No longer necessarily depends on OpenPGP key
                       size.
  (FILES): Add default locations for TLS public and private key files.
  (EXAMPLE): Use new --tls-pubkey and --tls-privkey options.
  (SECURITY): Alter wording slightly to reflect new dual-key design.
  (SEE ALSO/GnuTLS): Alter description to match new design.
  (SEE ALSO): Add reference to RFC 7250, and alter description of when
              RFC 6091 is used.

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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
58
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
59
80
 
60
81
import dbus
61
 
import gobject
62
 
import avahi
 
82
import dbus.service
 
83
from gi.repository import GLib
63
84
from dbus.mainloop.glib import DBusGMainLoop
64
85
import ctypes
65
 
 
66
 
version = "1.0"
67
 
 
68
 
logger = logging.Logger('mandos')
69
 
syslogger = logging.handlers.SysLogHandler\
70
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
71
 
             address = "/dev/log")
72
 
syslogger.setFormatter(logging.Formatter\
73
 
                        ('Mandos: %(levelname)s: %(message)s'))
74
 
logger.addHandler(syslogger)
75
 
 
76
 
console = logging.StreamHandler()
77
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
78
 
                                       ' %(message)s'))
79
 
logger.addHandler(console)
 
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 = "1.7.20"
 
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
 
80
303
 
81
304
class AvahiError(Exception):
82
 
    def __init__(self, value):
 
305
    def __init__(self, value, *args, **kwargs):
83
306
        self.value = value
84
 
    def __str__(self):
85
 
        return repr(self.value)
 
307
        return super(AvahiError, self).__init__(value, *args,
 
308
                                                **kwargs)
 
309
 
86
310
 
87
311
class AvahiServiceError(AvahiError):
88
312
    pass
89
313
 
 
314
 
90
315
class AvahiGroupError(AvahiError):
91
316
    pass
92
317
 
93
318
 
94
319
class AvahiService(object):
95
320
    """An Avahi (Zeroconf) service.
 
321
 
96
322
    Attributes:
97
323
    interface: integer; avahi.IF_UNSPEC or an interface index.
98
324
               Used to optionally bind to the specified interface.
99
325
    name: string; Example: 'Mandos'
100
326
    type: string; Example: '_mandos._tcp'.
101
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
 
327
     See <https://www.iana.org/assignments/service-names-port-numbers>
102
328
    port: integer; what port to announce
103
329
    TXT: list of strings; TXT record for the service
104
330
    domain: string; Domain to publish on, default to .local if empty.
106
332
    max_renames: integer; maximum number of renames
107
333
    rename_count: integer; counter so we only rename after collisions
108
334
                  a sensible number of times
 
335
    group: D-Bus Entry Group
 
336
    server: D-Bus Server
 
337
    bus: dbus.SystemBus()
109
338
    """
110
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
111
 
                 type = None, port = None, TXT = None, domain = "",
112
 
                 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):
113
351
        self.interface = interface
114
352
        self.name = name
115
 
        self.type = type
 
353
        self.type = servicetype
116
354
        self.port = port
117
 
        if TXT is None:
118
 
            self.TXT = []
119
 
        else:
120
 
            self.TXT = TXT
 
355
        self.TXT = TXT if TXT is not None else []
121
356
        self.domain = domain
122
357
        self.host = host
123
358
        self.rename_count = 0
124
359
        self.max_renames = max_renames
125
 
    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):
126
367
        """Derived from the Avahi example code"""
127
368
        if self.rename_count >= self.max_renames:
128
 
            logger.critical(u"No suitable Zeroconf service name found"
129
 
                            u" after %i retries, exiting.",
130
 
                            rename_count)
 
369
            logger.critical("No suitable Zeroconf service name found"
 
370
                            " after %i retries, exiting.",
 
371
                            self.rename_count)
131
372
            raise AvahiServiceError("Too many renames")
132
 
        self.name = server.GetAlternativeServiceName(self.name)
133
 
        logger.info(u"Changing Zeroconf service name to %r ...",
134
 
                    str(self.name))
135
 
        syslogger.setFormatter(logging.Formatter\
136
 
                               ('Mandos (%s): %%(levelname)s:'
137
 
                               ' %%(message)s' % self.name))
138
 
        self.remove()
139
 
        self.add()
 
373
        self.name = str(
 
374
            self.server.GetAlternativeServiceName(self.name))
140
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
 
141
392
    def remove(self):
142
393
        """Derived from the Avahi example code"""
143
 
        if group is not None:
144
 
            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
 
145
400
    def add(self):
146
401
        """Derived from the Avahi example code"""
147
 
        global group
148
 
        if group is None:
149
 
            group = dbus.Interface\
150
 
                    (bus.get_object(avahi.DBUS_NAME,
151
 
                                    server.EntryGroupNew()),
152
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
153
 
            group.connect_to_signal('StateChanged',
154
 
                                    entry_group_state_changed)
155
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
156
 
                     service.name, service.type)
157
 
        group.AddService(
158
 
                self.interface,         # interface
159
 
                avahi.PROTO_INET6,      # protocol
160
 
                dbus.UInt32(0),         # flags
161
 
                self.name, self.type,
162
 
                self.domain, self.host,
163
 
                dbus.UInt16(self.port),
164
 
                avahi.string_array_to_txt_array(self.TXT))
165
 
        group.Commit()
166
 
 
167
 
# From the Avahi example code:
168
 
group = None                            # our entry group
169
 
# End of Avahi example code
 
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
    _tls_rawpk_version = b"3.6.6"
 
518
 
 
519
    def __init__(self):
 
520
        # Need to use "self" here, since this method is called before
 
521
        # the assignment to the "gnutls" global variable happens.
 
522
        if self.check_version(self._need_version) is None:
 
523
            raise self.Error("Needs GnuTLS {} or later"
 
524
                             .format(self._need_version))
 
525
 
 
526
    # Unless otherwise indicated, the constants and types below are
 
527
    # all from the gnutls/gnutls.h C header file.
 
528
 
 
529
    # Constants
 
530
    E_SUCCESS = 0
 
531
    E_INTERRUPTED = -52
 
532
    E_AGAIN = -28
 
533
    CRT_OPENPGP = 2
 
534
    CRT_RAWPK = 3
 
535
    CLIENT = 2
 
536
    SHUT_RDWR = 0
 
537
    CRD_CERTIFICATE = 1
 
538
    E_NO_CERTIFICATE_FOUND = -49
 
539
    X509_FMT_DER = 0
 
540
    NO_TICKETS = 1<<10
 
541
    ENABLE_RAWPK = 1<<18
 
542
    CTYPE_PEERS = 3
 
543
    KEYID_USE_SHA256 = 1        # gnutls/x509.h
 
544
    OPENPGP_FMT_RAW = 0         # gnutls/openpgp.h
 
545
 
 
546
    # Types
 
547
    class session_int(ctypes.Structure):
 
548
        _fields_ = []
 
549
    session_t = ctypes.POINTER(session_int)
 
550
 
 
551
    class certificate_credentials_st(ctypes.Structure):
 
552
        _fields_ = []
 
553
    certificate_credentials_t = ctypes.POINTER(
 
554
        certificate_credentials_st)
 
555
    certificate_type_t = ctypes.c_int
 
556
 
 
557
    class datum_t(ctypes.Structure):
 
558
        _fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),
 
559
                    ('size', ctypes.c_uint)]
 
560
 
 
561
    class openpgp_crt_int(ctypes.Structure):
 
562
        _fields_ = []
 
563
    openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)
 
564
    openpgp_crt_fmt_t = ctypes.c_int  # gnutls/openpgp.h
 
565
    log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)
 
566
    credentials_type_t = ctypes.c_int
 
567
    transport_ptr_t = ctypes.c_void_p
 
568
    close_request_t = ctypes.c_int
 
569
 
 
570
    # Exceptions
 
571
    class Error(Exception):
 
572
        # We need to use the class name "GnuTLS" here, since this
 
573
        # exception might be raised from within GnuTLS.__init__,
 
574
        # which is called before the assignment to the "gnutls"
 
575
        # global variable has happened.
 
576
        def __init__(self, message=None, code=None, args=()):
 
577
            # Default usage is by a message string, but if a return
 
578
            # code is passed, convert it to a string with
 
579
            # gnutls.strerror()
 
580
            self.code = code
 
581
            if message is None and code is not None:
 
582
                message = GnuTLS.strerror(code)
 
583
            return super(GnuTLS.Error, self).__init__(
 
584
                message, *args)
 
585
 
 
586
    class CertificateSecurityError(Error):
 
587
        pass
 
588
 
 
589
    # Classes
 
590
    class Credentials(object):
 
591
        def __init__(self):
 
592
            self._c_object = gnutls.certificate_credentials_t()
 
593
            gnutls.certificate_allocate_credentials(
 
594
                ctypes.byref(self._c_object))
 
595
            self.type = gnutls.CRD_CERTIFICATE
 
596
 
 
597
        def __del__(self):
 
598
            gnutls.certificate_free_credentials(self._c_object)
 
599
 
 
600
    class ClientSession(object):
 
601
        def __init__(self, socket, credentials=None):
 
602
            self._c_object = gnutls.session_t()
 
603
            gnutls_flags = gnutls.CLIENT
 
604
            if gnutls.check_version("3.5.6"):
 
605
                gnutls_flags |= gnutls.NO_TICKETS
 
606
            if gnutls.has_rawpk:
 
607
                gnutls_flags |= gnutls.ENABLE_RAWPK
 
608
            gnutls.init(ctypes.byref(self._c_object), gnutls_flags)
 
609
            del gnutls_flags
 
610
            gnutls.set_default_priority(self._c_object)
 
611
            gnutls.transport_set_ptr(self._c_object, socket.fileno())
 
612
            gnutls.handshake_set_private_extensions(self._c_object,
 
613
                                                    True)
 
614
            self.socket = socket
 
615
            if credentials is None:
 
616
                credentials = gnutls.Credentials()
 
617
            gnutls.credentials_set(self._c_object, credentials.type,
 
618
                                   ctypes.cast(credentials._c_object,
 
619
                                               ctypes.c_void_p))
 
620
            self.credentials = credentials
 
621
 
 
622
        def __del__(self):
 
623
            gnutls.deinit(self._c_object)
 
624
 
 
625
        def handshake(self):
 
626
            return gnutls.handshake(self._c_object)
 
627
 
 
628
        def send(self, data):
 
629
            data = bytes(data)
 
630
            data_len = len(data)
 
631
            while data_len > 0:
 
632
                data_len -= gnutls.record_send(self._c_object,
 
633
                                               data[-data_len:],
 
634
                                               data_len)
 
635
 
 
636
        def bye(self):
 
637
            return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)
 
638
 
 
639
    # Error handling functions
 
640
    def _error_code(result):
 
641
        """A function to raise exceptions on errors, suitable
 
642
        for the 'restype' attribute on ctypes functions"""
 
643
        if result >= 0:
 
644
            return result
 
645
        if result == gnutls.E_NO_CERTIFICATE_FOUND:
 
646
            raise gnutls.CertificateSecurityError(code=result)
 
647
        raise gnutls.Error(code=result)
 
648
 
 
649
    def _retry_on_error(result, func, arguments):
 
650
        """A function to retry on some errors, suitable
 
651
        for the 'errcheck' attribute on ctypes functions"""
 
652
        while result < 0:
 
653
            if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):
 
654
                return _error_code(result)
 
655
            result = func(*arguments)
 
656
        return result
 
657
 
 
658
    # Unless otherwise indicated, the function declarations below are
 
659
    # all from the gnutls/gnutls.h C header file.
 
660
 
 
661
    # Functions
 
662
    priority_set_direct = _library.gnutls_priority_set_direct
 
663
    priority_set_direct.argtypes = [session_t, ctypes.c_char_p,
 
664
                                    ctypes.POINTER(ctypes.c_char_p)]
 
665
    priority_set_direct.restype = _error_code
 
666
 
 
667
    init = _library.gnutls_init
 
668
    init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]
 
669
    init.restype = _error_code
 
670
 
 
671
    set_default_priority = _library.gnutls_set_default_priority
 
672
    set_default_priority.argtypes = [session_t]
 
673
    set_default_priority.restype = _error_code
 
674
 
 
675
    record_send = _library.gnutls_record_send
 
676
    record_send.argtypes = [session_t, ctypes.c_void_p,
 
677
                            ctypes.c_size_t]
 
678
    record_send.restype = ctypes.c_ssize_t
 
679
    record_send.errcheck = _retry_on_error
 
680
 
 
681
    certificate_allocate_credentials = (
 
682
        _library.gnutls_certificate_allocate_credentials)
 
683
    certificate_allocate_credentials.argtypes = [
 
684
        ctypes.POINTER(certificate_credentials_t)]
 
685
    certificate_allocate_credentials.restype = _error_code
 
686
 
 
687
    certificate_free_credentials = (
 
688
        _library.gnutls_certificate_free_credentials)
 
689
    certificate_free_credentials.argtypes = [
 
690
        certificate_credentials_t]
 
691
    certificate_free_credentials.restype = None
 
692
 
 
693
    handshake_set_private_extensions = (
 
694
        _library.gnutls_handshake_set_private_extensions)
 
695
    handshake_set_private_extensions.argtypes = [session_t,
 
696
                                                 ctypes.c_int]
 
697
    handshake_set_private_extensions.restype = None
 
698
 
 
699
    credentials_set = _library.gnutls_credentials_set
 
700
    credentials_set.argtypes = [session_t, credentials_type_t,
 
701
                                ctypes.c_void_p]
 
702
    credentials_set.restype = _error_code
 
703
 
 
704
    strerror = _library.gnutls_strerror
 
705
    strerror.argtypes = [ctypes.c_int]
 
706
    strerror.restype = ctypes.c_char_p
 
707
 
 
708
    certificate_type_get = _library.gnutls_certificate_type_get
 
709
    certificate_type_get.argtypes = [session_t]
 
710
    certificate_type_get.restype = _error_code
 
711
 
 
712
    certificate_get_peers = _library.gnutls_certificate_get_peers
 
713
    certificate_get_peers.argtypes = [session_t,
 
714
                                      ctypes.POINTER(ctypes.c_uint)]
 
715
    certificate_get_peers.restype = ctypes.POINTER(datum_t)
 
716
 
 
717
    global_set_log_level = _library.gnutls_global_set_log_level
 
718
    global_set_log_level.argtypes = [ctypes.c_int]
 
719
    global_set_log_level.restype = None
 
720
 
 
721
    global_set_log_function = _library.gnutls_global_set_log_function
 
722
    global_set_log_function.argtypes = [log_func]
 
723
    global_set_log_function.restype = None
 
724
 
 
725
    deinit = _library.gnutls_deinit
 
726
    deinit.argtypes = [session_t]
 
727
    deinit.restype = None
 
728
 
 
729
    handshake = _library.gnutls_handshake
 
730
    handshake.argtypes = [session_t]
 
731
    handshake.restype = _error_code
 
732
    handshake.errcheck = _retry_on_error
 
733
 
 
734
    transport_set_ptr = _library.gnutls_transport_set_ptr
 
735
    transport_set_ptr.argtypes = [session_t, transport_ptr_t]
 
736
    transport_set_ptr.restype = None
 
737
 
 
738
    bye = _library.gnutls_bye
 
739
    bye.argtypes = [session_t, close_request_t]
 
740
    bye.restype = _error_code
 
741
    bye.errcheck = _retry_on_error
 
742
 
 
743
    check_version = _library.gnutls_check_version
 
744
    check_version.argtypes = [ctypes.c_char_p]
 
745
    check_version.restype = ctypes.c_char_p
 
746
 
 
747
    has_rawpk = bool(check_version(_tls_rawpk_version))
 
748
 
 
749
    if has_rawpk:
 
750
        # Types
 
751
        class pubkey_st(ctypes.Structure):
 
752
            _fields = []
 
753
        pubkey_t = ctypes.POINTER(pubkey_st)
 
754
 
 
755
        x509_crt_fmt_t = ctypes.c_int
 
756
 
 
757
        # All the function declarations below are from gnutls/abstract.h
 
758
        pubkey_init = _library.gnutls_pubkey_init
 
759
        pubkey_init.argtypes = [ctypes.POINTER(pubkey_t)]
 
760
        pubkey_init.restype = _error_code
 
761
 
 
762
        pubkey_import = _library.gnutls_pubkey_import
 
763
        pubkey_import.argtypes = [pubkey_t, ctypes.POINTER(datum_t),
 
764
                                  x509_crt_fmt_t]
 
765
        pubkey_import.restype = _error_code
 
766
 
 
767
        pubkey_get_key_id = _library.gnutls_pubkey_get_key_id
 
768
        pubkey_get_key_id.argtypes = [pubkey_t, ctypes.c_int,
 
769
                                      ctypes.POINTER(ctypes.c_ubyte),
 
770
                                      ctypes.POINTER(ctypes.c_size_t)]
 
771
        pubkey_get_key_id.restype = _error_code
 
772
 
 
773
        pubkey_deinit = _library.gnutls_pubkey_deinit
 
774
        pubkey_deinit.argtypes = [pubkey_t]
 
775
        pubkey_deinit.restype = None
 
776
    else:
 
777
        # All the function declarations below are from gnutls/openpgp.h
 
778
 
 
779
        openpgp_crt_init = _library.gnutls_openpgp_crt_init
 
780
        openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]
 
781
        openpgp_crt_init.restype = _error_code
 
782
 
 
783
        openpgp_crt_import = _library.gnutls_openpgp_crt_import
 
784
        openpgp_crt_import.argtypes = [openpgp_crt_t,
 
785
                                       ctypes.POINTER(datum_t),
 
786
                                       openpgp_crt_fmt_t]
 
787
        openpgp_crt_import.restype = _error_code
 
788
 
 
789
        openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self
 
790
        openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,
 
791
                                            ctypes.POINTER(ctypes.c_uint)]
 
792
        openpgp_crt_verify_self.restype = _error_code
 
793
 
 
794
        openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit
 
795
        openpgp_crt_deinit.argtypes = [openpgp_crt_t]
 
796
        openpgp_crt_deinit.restype = None
 
797
 
 
798
        openpgp_crt_get_fingerprint = (
 
799
            _library.gnutls_openpgp_crt_get_fingerprint)
 
800
        openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,
 
801
                                                ctypes.c_void_p,
 
802
                                                ctypes.POINTER(
 
803
                                                    ctypes.c_size_t)]
 
804
        openpgp_crt_get_fingerprint.restype = _error_code
 
805
 
 
806
    if check_version("3.6.4"):
 
807
        certificate_type_get2 = _library.gnutls_certificate_type_get2
 
808
        certificate_type_get2.argtypes = [session_t, ctypes.c_int]
 
809
        certificate_type_get2.restype = _error_code
 
810
 
 
811
    # Remove non-public functions
 
812
    del _error_code, _retry_on_error
 
813
# Create the global "gnutls" object, simulating a module
 
814
gnutls = GnuTLS()
 
815
 
 
816
 
 
817
def call_pipe(connection,       # : multiprocessing.Connection
 
818
              func, *args, **kwargs):
 
819
    """This function is meant to be called by multiprocessing.Process
 
820
 
 
821
    This function runs func(*args, **kwargs), and writes the resulting
 
822
    return value on the provided multiprocessing.Connection.
 
823
    """
 
824
    connection.send(func(*args, **kwargs))
 
825
    connection.close()
170
826
 
171
827
 
172
828
class Client(object):
173
829
    """A representation of a client host served by this server.
 
830
 
174
831
    Attributes:
175
 
    name:      string; from the config file, used in log messages
176
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
177
 
                 uniquely identify the client
178
 
    secret:    bytestring; sent verbatim (over TLS) to client
179
 
    host:      string; available for use by the checker command
180
 
    created:   datetime.datetime(); object creation, not client host
181
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
182
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
183
 
                                     until this client is invalid
184
 
    interval:  datetime.timedelta(); How often to start a new checker
185
 
    stop_hook: If set, called by stop() as stop_hook(self)
186
 
    checker:   subprocess.Popen(); a running checker process used
187
 
                                   to see if the client lives.
188
 
                                   'None' if no process is running.
189
 
    checker_initiator_tag: a gobject event source tag, or None
190
 
    stop_initiator_tag:    - '' -
191
 
    checker_callback_tag:  - '' -
192
 
    checker_command: string; External command which is run to check if
193
 
                     client lives.  %() expansions are done at
 
832
    approved:   bool(); 'None' if not yet approved/disapproved
 
833
    approval_delay: datetime.timedelta(); Time to wait for approval
 
834
    approval_duration: datetime.timedelta(); Duration of one approval
 
835
    checker:    subprocess.Popen(); a running checker process used
 
836
                                    to see if the client lives.
 
837
                                    'None' if no process is running.
 
838
    checker_callback_tag: a GLib event source tag, or None
 
839
    checker_command: string; External command which is run to check
 
840
                     if client lives.  %() expansions are done at
194
841
                     runtime with vars(self) as dict, so that for
195
842
                     instance %(name)s can be used in the command.
196
 
    Private attibutes:
197
 
    _timeout: Real variable for 'timeout'
198
 
    _interval: Real variable for 'interval'
199
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
200
 
    _interval_milliseconds: - '' -
 
843
    checker_initiator_tag: a GLib event source tag, or None
 
844
    created:    datetime.datetime(); (UTC) object creation
 
845
    client_structure: Object describing what attributes a client has
 
846
                      and is used for storing the client at exit
 
847
    current_checker_command: string; current running checker_command
 
848
    disable_initiator_tag: a GLib event source tag, or None
 
849
    enabled:    bool()
 
850
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
851
                 uniquely identify an OpenPGP client
 
852
    key_id: string (64 hexadecimal digits); used to uniquely identify
 
853
            a client using raw public keys
 
854
    host:       string; available for use by the checker command
 
855
    interval:   datetime.timedelta(); How often to start a new checker
 
856
    last_approval_request: datetime.datetime(); (UTC) or None
 
857
    last_checked_ok: datetime.datetime(); (UTC) or None
 
858
    last_checker_status: integer between 0 and 255 reflecting exit
 
859
                         status of last checker. -1 reflects crashed
 
860
                         checker, -2 means no checker completed yet.
 
861
    last_checker_signal: The signal which killed the last checker, if
 
862
                         last_checker_status is -1
 
863
    last_enabled: datetime.datetime(); (UTC) or None
 
864
    name:       string; from the config file, used in log messages and
 
865
                        D-Bus identifiers
 
866
    secret:     bytestring; sent verbatim (over TLS) to client
 
867
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
868
                                      until this client is disabled
 
869
    extended_timeout:   extra long timeout when secret has been sent
 
870
    runtime_expansions: Allowed attributes for runtime expansion.
 
871
    expires:    datetime.datetime(); time (UTC) when a client will be
 
872
                disabled, or None
 
873
    server_settings: The server_settings dict from main()
201
874
    """
202
 
    def _set_timeout(self, timeout):
203
 
        "Setter function for 'timeout' attribute"
204
 
        self._timeout = timeout
205
 
        self._timeout_milliseconds = ((self.timeout.days
206
 
                                       * 24 * 60 * 60 * 1000)
207
 
                                      + (self.timeout.seconds * 1000)
208
 
                                      + (self.timeout.microseconds
209
 
                                         // 1000))
210
 
    timeout = property(lambda self: self._timeout,
211
 
                       _set_timeout)
212
 
    del _set_timeout
213
 
    def _set_interval(self, interval):
214
 
        "Setter function for 'interval' attribute"
215
 
        self._interval = interval
216
 
        self._interval_milliseconds = ((self.interval.days
217
 
                                        * 24 * 60 * 60 * 1000)
218
 
                                       + (self.interval.seconds
219
 
                                          * 1000)
220
 
                                       + (self.interval.microseconds
221
 
                                          // 1000))
222
 
    interval = property(lambda self: self._interval,
223
 
                        _set_interval)
224
 
    del _set_interval
225
 
    def __init__(self, name = None, stop_hook=None, config={}):
226
 
        """Note: the 'checker' key in 'config' sets the
227
 
        'checker_command' attribute and *not* the 'checker'
228
 
        attribute."""
 
875
 
 
876
    runtime_expansions = ("approval_delay", "approval_duration",
 
877
                          "created", "enabled", "expires", "key_id",
 
878
                          "fingerprint", "host", "interval",
 
879
                          "last_approval_request", "last_checked_ok",
 
880
                          "last_enabled", "name", "timeout")
 
881
    client_defaults = {
 
882
        "timeout": "PT5M",
 
883
        "extended_timeout": "PT15M",
 
884
        "interval": "PT2M",
 
885
        "checker": "fping -q -- %%(host)s",
 
886
        "host": "",
 
887
        "approval_delay": "PT0S",
 
888
        "approval_duration": "PT1S",
 
889
        "approved_by_default": "True",
 
890
        "enabled": "True",
 
891
    }
 
892
 
 
893
    @staticmethod
 
894
    def config_parser(config):
 
895
        """Construct a new dict of client settings of this form:
 
896
        { client_name: {setting_name: value, ...}, ...}
 
897
        with exceptions for any special settings as defined above.
 
898
        NOTE: Must be a pure function. Must return the same result
 
899
        value given the same arguments.
 
900
        """
 
901
        settings = {}
 
902
        for client_name in config.sections():
 
903
            section = dict(config.items(client_name))
 
904
            client = settings[client_name] = {}
 
905
 
 
906
            client["host"] = section["host"]
 
907
            # Reformat values from string types to Python types
 
908
            client["approved_by_default"] = config.getboolean(
 
909
                client_name, "approved_by_default")
 
910
            client["enabled"] = config.getboolean(client_name,
 
911
                                                  "enabled")
 
912
 
 
913
            # Uppercase and remove spaces from key_id and fingerprint
 
914
            # for later comparison purposes with return value from the
 
915
            # key_id() and fingerprint() functions
 
916
            client["key_id"] = (section.get("key_id", "").upper()
 
917
                                .replace(" ", ""))
 
918
            client["fingerprint"] = (section["fingerprint"].upper()
 
919
                                     .replace(" ", ""))
 
920
            if "secret" in section:
 
921
                client["secret"] = codecs.decode(section["secret"]
 
922
                                                 .encode("utf-8"),
 
923
                                                 "base64")
 
924
            elif "secfile" in section:
 
925
                with open(os.path.expanduser(os.path.expandvars
 
926
                                             (section["secfile"])),
 
927
                          "rb") as secfile:
 
928
                    client["secret"] = secfile.read()
 
929
            else:
 
930
                raise TypeError("No secret or secfile for section {}"
 
931
                                .format(section))
 
932
            client["timeout"] = string_to_delta(section["timeout"])
 
933
            client["extended_timeout"] = string_to_delta(
 
934
                section["extended_timeout"])
 
935
            client["interval"] = string_to_delta(section["interval"])
 
936
            client["approval_delay"] = string_to_delta(
 
937
                section["approval_delay"])
 
938
            client["approval_duration"] = string_to_delta(
 
939
                section["approval_duration"])
 
940
            client["checker_command"] = section["checker"]
 
941
            client["last_approval_request"] = None
 
942
            client["last_checked_ok"] = None
 
943
            client["last_checker_status"] = -2
 
944
 
 
945
        return settings
 
946
 
 
947
    def __init__(self, settings, name=None, server_settings=None):
229
948
        self.name = name
230
 
        logger.debug(u"Creating client %r", self.name)
231
 
        # Uppercase and remove spaces from fingerprint for later
232
 
        # comparison purposes with return value from the fingerprint()
233
 
        # function
234
 
        self.fingerprint = config["fingerprint"].upper()\
235
 
                           .replace(u" ", u"")
236
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
237
 
        if "secret" in config:
238
 
            self.secret = config["secret"].decode(u"base64")
239
 
        elif "secfile" in config:
240
 
            sf = open(config["secfile"])
241
 
            self.secret = sf.read()
242
 
            sf.close()
 
949
        if server_settings is None:
 
950
            server_settings = {}
 
951
        self.server_settings = server_settings
 
952
        # adding all client settings
 
953
        for setting, value in settings.items():
 
954
            setattr(self, setting, value)
 
955
 
 
956
        if self.enabled:
 
957
            if not hasattr(self, "last_enabled"):
 
958
                self.last_enabled = datetime.datetime.utcnow()
 
959
            if not hasattr(self, "expires"):
 
960
                self.expires = (datetime.datetime.utcnow()
 
961
                                + self.timeout)
243
962
        else:
244
 
            raise TypeError(u"No secret or secfile for client %s"
245
 
                            % self.name)
246
 
        self.host = config.get("host", "")
247
 
        self.created = datetime.datetime.now()
248
 
        self.last_checked_ok = None
249
 
        self.timeout = string_to_delta(config["timeout"])
250
 
        self.interval = string_to_delta(config["interval"])
251
 
        self.stop_hook = stop_hook
 
963
            self.last_enabled = None
 
964
            self.expires = None
 
965
 
 
966
        logger.debug("Creating client %r", self.name)
 
967
        logger.debug("  Key ID: %s", self.key_id)
 
968
        logger.debug("  Fingerprint: %s", self.fingerprint)
 
969
        self.created = settings.get("created",
 
970
                                    datetime.datetime.utcnow())
 
971
 
 
972
        # attributes specific for this server instance
252
973
        self.checker = None
253
974
        self.checker_initiator_tag = None
254
 
        self.stop_initiator_tag = None
 
975
        self.disable_initiator_tag = None
255
976
        self.checker_callback_tag = None
256
 
        self.check_command = config["checker"]
257
 
    def start(self):
 
977
        self.current_checker_command = None
 
978
        self.approved = None
 
979
        self.approvals_pending = 0
 
980
        self.changedstate = multiprocessing_manager.Condition(
 
981
            multiprocessing_manager.Lock())
 
982
        self.client_structure = [attr
 
983
                                 for attr in self.__dict__.keys()
 
984
                                 if not attr.startswith("_")]
 
985
        self.client_structure.append("client_structure")
 
986
 
 
987
        for name, t in inspect.getmembers(
 
988
                type(self), lambda obj: isinstance(obj, property)):
 
989
            if not name.startswith("_"):
 
990
                self.client_structure.append(name)
 
991
 
 
992
    # Send notice to process children that client state has changed
 
993
    def send_changedstate(self):
 
994
        with self.changedstate:
 
995
            self.changedstate.notify_all()
 
996
 
 
997
    def enable(self):
258
998
        """Start this client's checker and timeout hooks"""
 
999
        if getattr(self, "enabled", False):
 
1000
            # Already enabled
 
1001
            return
 
1002
        self.expires = datetime.datetime.utcnow() + self.timeout
 
1003
        self.enabled = True
 
1004
        self.last_enabled = datetime.datetime.utcnow()
 
1005
        self.init_checker()
 
1006
        self.send_changedstate()
 
1007
 
 
1008
    def disable(self, quiet=True):
 
1009
        """Disable this client."""
 
1010
        if not getattr(self, "enabled", False):
 
1011
            return False
 
1012
        if not quiet:
 
1013
            logger.info("Disabling client %s", self.name)
 
1014
        if getattr(self, "disable_initiator_tag", None) is not None:
 
1015
            GLib.source_remove(self.disable_initiator_tag)
 
1016
            self.disable_initiator_tag = None
 
1017
        self.expires = None
 
1018
        if getattr(self, "checker_initiator_tag", None) is not None:
 
1019
            GLib.source_remove(self.checker_initiator_tag)
 
1020
            self.checker_initiator_tag = None
 
1021
        self.stop_checker()
 
1022
        self.enabled = False
 
1023
        if not quiet:
 
1024
            self.send_changedstate()
 
1025
        # Do not run this again if called by a GLib.timeout_add
 
1026
        return False
 
1027
 
 
1028
    def __del__(self):
 
1029
        self.disable()
 
1030
 
 
1031
    def init_checker(self):
259
1032
        # Schedule a new checker to be started an 'interval' from now,
260
1033
        # and every interval from then on.
261
 
        self.checker_initiator_tag = gobject.timeout_add\
262
 
                                     (self._interval_milliseconds,
263
 
                                      self.start_checker)
 
1034
        if self.checker_initiator_tag is not None:
 
1035
            GLib.source_remove(self.checker_initiator_tag)
 
1036
        self.checker_initiator_tag = GLib.timeout_add(
 
1037
            int(self.interval.total_seconds() * 1000),
 
1038
            self.start_checker)
 
1039
        # Schedule a disable() when 'timeout' has passed
 
1040
        if self.disable_initiator_tag is not None:
 
1041
            GLib.source_remove(self.disable_initiator_tag)
 
1042
        self.disable_initiator_tag = GLib.timeout_add(
 
1043
            int(self.timeout.total_seconds() * 1000), self.disable)
264
1044
        # Also start a new checker *right now*.
265
1045
        self.start_checker()
266
 
        # Schedule a stop() when 'timeout' has passed
267
 
        self.stop_initiator_tag = gobject.timeout_add\
268
 
                                  (self._timeout_milliseconds,
269
 
                                   self.stop)
270
 
    def stop(self):
271
 
        """Stop this client.
272
 
        The possibility that a client might be restarted is left open,
273
 
        but not currently used."""
274
 
        # If this client doesn't have a secret, it is already stopped.
275
 
        if hasattr(self, "secret") and self.secret:
276
 
            logger.info(u"Stopping client %s", self.name)
277
 
            self.secret = None
278
 
        else:
279
 
            return False
280
 
        if getattr(self, "stop_initiator_tag", False):
281
 
            gobject.source_remove(self.stop_initiator_tag)
282
 
            self.stop_initiator_tag = None
283
 
        if getattr(self, "checker_initiator_tag", False):
284
 
            gobject.source_remove(self.checker_initiator_tag)
285
 
            self.checker_initiator_tag = None
286
 
        self.stop_checker()
287
 
        if self.stop_hook:
288
 
            self.stop_hook(self)
289
 
        # Do not run this again if called by a gobject.timeout_add
290
 
        return False
291
 
    def __del__(self):
292
 
        self.stop_hook = None
293
 
        self.stop()
294
 
    def checker_callback(self, pid, condition):
 
1046
 
 
1047
    def checker_callback(self, source, condition, connection,
 
1048
                         command):
295
1049
        """The checker has completed, so take appropriate actions."""
296
 
        now = datetime.datetime.now()
297
1050
        self.checker_callback_tag = None
298
1051
        self.checker = None
299
 
        if os.WIFEXITED(condition) \
300
 
               and (os.WEXITSTATUS(condition) == 0):
301
 
            logger.info(u"Checker for %(name)s succeeded",
302
 
                        vars(self))
303
 
            self.last_checked_ok = now
304
 
            gobject.source_remove(self.stop_initiator_tag)
305
 
            self.stop_initiator_tag = gobject.timeout_add\
306
 
                                      (self._timeout_milliseconds,
307
 
                                       self.stop)
308
 
        elif not os.WIFEXITED(condition):
309
 
            logger.warning(u"Checker for %(name)s crashed?",
 
1052
        # Read return code from connection (see call_pipe)
 
1053
        returncode = connection.recv()
 
1054
        connection.close()
 
1055
 
 
1056
        if returncode >= 0:
 
1057
            self.last_checker_status = returncode
 
1058
            self.last_checker_signal = None
 
1059
            if self.last_checker_status == 0:
 
1060
                logger.info("Checker for %(name)s succeeded",
 
1061
                            vars(self))
 
1062
                self.checked_ok()
 
1063
            else:
 
1064
                logger.info("Checker for %(name)s failed", vars(self))
 
1065
        else:
 
1066
            self.last_checker_status = -1
 
1067
            self.last_checker_signal = -returncode
 
1068
            logger.warning("Checker for %(name)s crashed?",
310
1069
                           vars(self))
311
 
        else:
312
 
            logger.info(u"Checker for %(name)s failed",
313
 
                        vars(self))
 
1070
        return False
 
1071
 
 
1072
    def checked_ok(self):
 
1073
        """Assert that the client has been seen, alive and well."""
 
1074
        self.last_checked_ok = datetime.datetime.utcnow()
 
1075
        self.last_checker_status = 0
 
1076
        self.last_checker_signal = None
 
1077
        self.bump_timeout()
 
1078
 
 
1079
    def bump_timeout(self, timeout=None):
 
1080
        """Bump up the timeout for this client."""
 
1081
        if timeout is None:
 
1082
            timeout = self.timeout
 
1083
        if self.disable_initiator_tag is not None:
 
1084
            GLib.source_remove(self.disable_initiator_tag)
 
1085
            self.disable_initiator_tag = None
 
1086
        if getattr(self, "enabled", False):
 
1087
            self.disable_initiator_tag = GLib.timeout_add(
 
1088
                int(timeout.total_seconds() * 1000), self.disable)
 
1089
            self.expires = datetime.datetime.utcnow() + timeout
 
1090
 
 
1091
    def need_approval(self):
 
1092
        self.last_approval_request = datetime.datetime.utcnow()
 
1093
 
314
1094
    def start_checker(self):
315
1095
        """Start a new checker subprocess if one is not running.
 
1096
 
316
1097
        If a checker already exists, leave it running and do
317
1098
        nothing."""
318
1099
        # The reason for not killing a running checker is that if we
319
 
        # did that, then if a checker (for some reason) started
320
 
        # running slowly and taking more than 'interval' time, the
321
 
        # client would inevitably timeout, since no checker would get
322
 
        # a chance to run to completion.  If we instead leave running
 
1100
        # did that, and if a checker (for some reason) started running
 
1101
        # slowly and taking more than 'interval' time, then the client
 
1102
        # would inevitably timeout, since no checker would get a
 
1103
        # chance to run to completion.  If we instead leave running
323
1104
        # checkers alone, the checker would have to take more time
324
 
        # than 'timeout' for the client to be declared invalid, which
325
 
        # is as it should be.
 
1105
        # than 'timeout' for the client to be disabled, which is as it
 
1106
        # should be.
 
1107
 
 
1108
        if self.checker is not None and not self.checker.is_alive():
 
1109
            logger.warning("Checker was not alive; joining")
 
1110
            self.checker.join()
 
1111
            self.checker = None
 
1112
        # Start a new checker if needed
326
1113
        if self.checker is None:
327
 
            try:
328
 
                # In case check_command has exactly one % operator
329
 
                command = self.check_command % self.host
330
 
            except TypeError:
331
 
                # Escape attributes for the shell
332
 
                escaped_attrs = dict((key, re.escape(str(val)))
333
 
                                     for key, val in
334
 
                                     vars(self).iteritems())
335
 
                try:
336
 
                    command = self.check_command % escaped_attrs
337
 
                except TypeError, error:
338
 
                    logger.error(u'Could not format string "%s":'
339
 
                                 u' %s', self.check_command, error)
340
 
                    return True # Try again later
341
 
            try:
342
 
                logger.info(u"Starting checker %r for %s",
343
 
                            command, self.name)
344
 
                # We don't need to redirect stdout and stderr, since
345
 
                # in normal mode, that is already done by daemon(),
346
 
                # and in debug mode we don't want to.  (Stdin is
347
 
                # always replaced by /dev/null.)
348
 
                self.checker = subprocess.Popen(command,
349
 
                                                close_fds=True,
350
 
                                                shell=True, cwd="/")
351
 
                self.checker_callback_tag = gobject.child_watch_add\
352
 
                                            (self.checker.pid,
353
 
                                             self.checker_callback)
354
 
            except OSError, error:
355
 
                logger.error(u"Failed to start subprocess: %s",
356
 
                             error)
357
 
        # Re-run this periodically if run by gobject.timeout_add
 
1114
            # Escape attributes for the shell
 
1115
            escaped_attrs = {
 
1116
                attr: re.escape(str(getattr(self, attr)))
 
1117
                for attr in self.runtime_expansions}
 
1118
            try:
 
1119
                command = self.checker_command % escaped_attrs
 
1120
            except TypeError as error:
 
1121
                logger.error('Could not format string "%s"',
 
1122
                             self.checker_command,
 
1123
                             exc_info=error)
 
1124
                return True     # Try again later
 
1125
            self.current_checker_command = command
 
1126
            logger.info("Starting checker %r for %s", command,
 
1127
                        self.name)
 
1128
            # We don't need to redirect stdout and stderr, since
 
1129
            # in normal mode, that is already done by daemon(),
 
1130
            # and in debug mode we don't want to.  (Stdin is
 
1131
            # always replaced by /dev/null.)
 
1132
            # The exception is when not debugging but nevertheless
 
1133
            # running in the foreground; use the previously
 
1134
            # created wnull.
 
1135
            popen_args = {"close_fds": True,
 
1136
                          "shell": True,
 
1137
                          "cwd": "/"}
 
1138
            if (not self.server_settings["debug"]
 
1139
                and self.server_settings["foreground"]):
 
1140
                popen_args.update({"stdout": wnull,
 
1141
                                   "stderr": wnull})
 
1142
            pipe = multiprocessing.Pipe(duplex=False)
 
1143
            self.checker = multiprocessing.Process(
 
1144
                target=call_pipe,
 
1145
                args=(pipe[1], subprocess.call, command),
 
1146
                kwargs=popen_args)
 
1147
            self.checker.start()
 
1148
            self.checker_callback_tag = GLib.io_add_watch(
 
1149
                pipe[0].fileno(), GLib.IO_IN,
 
1150
                self.checker_callback, pipe[0], command)
 
1151
        # Re-run this periodically if run by GLib.timeout_add
358
1152
        return True
 
1153
 
359
1154
    def stop_checker(self):
360
1155
        """Force the checker process, if any, to stop."""
361
1156
        if self.checker_callback_tag:
362
 
            gobject.source_remove(self.checker_callback_tag)
 
1157
            GLib.source_remove(self.checker_callback_tag)
363
1158
            self.checker_callback_tag = None
364
1159
        if getattr(self, "checker", None) is None:
365
1160
            return
366
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
367
 
        try:
368
 
            os.kill(self.checker.pid, signal.SIGTERM)
369
 
            #os.sleep(0.5)
370
 
            #if self.checker.poll() is None:
371
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
372
 
        except OSError, error:
373
 
            if error.errno != errno.ESRCH: # No such process
374
 
                raise
 
1161
        logger.debug("Stopping checker for %(name)s", vars(self))
 
1162
        self.checker.terminate()
375
1163
        self.checker = None
376
 
    def still_valid(self):
377
 
        """Has the timeout not yet passed for this client?"""
378
 
        now = datetime.datetime.now()
379
 
        if self.last_checked_ok is None:
380
 
            return now < (self.created + self.timeout)
381
 
        else:
382
 
            return now < (self.last_checked_ok + self.timeout)
383
 
 
384
 
 
385
 
def peer_certificate(session):
386
 
    "Return the peer's OpenPGP certificate as a bytestring"
387
 
    # If not an OpenPGP certificate...
388
 
    if gnutls.library.functions.gnutls_certificate_type_get\
389
 
            (session._c_object) \
390
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
391
 
        # ...do the normal thing
392
 
        return session.peer_certificate
393
 
    list_size = ctypes.c_uint()
394
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
395
 
        (session._c_object, ctypes.byref(list_size))
396
 
    if list_size.value == 0:
397
 
        return None
398
 
    cert = cert_list[0]
399
 
    return ctypes.string_at(cert.data, cert.size)
400
 
 
401
 
 
402
 
def fingerprint(openpgp):
403
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
404
 
    # New GnuTLS "datum" with the OpenPGP public key
405
 
    datum = gnutls.library.types.gnutls_datum_t\
406
 
        (ctypes.cast(ctypes.c_char_p(openpgp),
407
 
                     ctypes.POINTER(ctypes.c_ubyte)),
408
 
         ctypes.c_uint(len(openpgp)))
409
 
    # New empty GnuTLS certificate
410
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
411
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
412
 
        (ctypes.byref(crt))
413
 
    # Import the OpenPGP public key into the certificate
414
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
415
 
                    (crt, ctypes.byref(datum),
416
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
417
 
    # Verify the self signature in the key
418
 
    crtverify = ctypes.c_uint();
419
 
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
420
 
        (crt, 0, ctypes.byref(crtverify))
421
 
    if crtverify.value != 0:
422
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
423
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
424
 
    # New buffer for the fingerprint
425
 
    buffer = ctypes.create_string_buffer(20)
426
 
    buffer_length = ctypes.c_size_t()
427
 
    # Get the fingerprint from the certificate into the buffer
428
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
429
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
430
 
    # Deinit the certificate
431
 
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
432
 
    # Convert the buffer to a Python bytestring
433
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
434
 
    # Convert the bytestring to hexadecimal notation
435
 
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
436
 
    return hex_fpr
437
 
 
438
 
 
439
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
440
 
    """A TCP request handler class.
441
 
    Instantiated by IPv6_TCPServer for each request to handle it.
 
1164
 
 
1165
 
 
1166
def dbus_service_property(dbus_interface,
 
1167
                          signature="v",
 
1168
                          access="readwrite",
 
1169
                          byte_arrays=False):
 
1170
    """Decorators for marking methods of a DBusObjectWithProperties to
 
1171
    become properties on the D-Bus.
 
1172
 
 
1173
    The decorated method will be called with no arguments by "Get"
 
1174
    and with one argument by "Set".
 
1175
 
 
1176
    The parameters, where they are supported, are the same as
 
1177
    dbus.service.method, except there is only "signature", since the
 
1178
    type from Get() and the type sent to Set() is the same.
 
1179
    """
 
1180
    # Encoding deeply encoded byte arrays is not supported yet by the
 
1181
    # "Set" method, so we fail early here:
 
1182
    if byte_arrays and signature != "ay":
 
1183
        raise ValueError("Byte arrays not supported for non-'ay'"
 
1184
                         " signature {!r}".format(signature))
 
1185
 
 
1186
    def decorator(func):
 
1187
        func._dbus_is_property = True
 
1188
        func._dbus_interface = dbus_interface
 
1189
        func._dbus_signature = signature
 
1190
        func._dbus_access = access
 
1191
        func._dbus_name = func.__name__
 
1192
        if func._dbus_name.endswith("_dbus_property"):
 
1193
            func._dbus_name = func._dbus_name[:-14]
 
1194
        func._dbus_get_args_options = {'byte_arrays': byte_arrays}
 
1195
        return func
 
1196
 
 
1197
    return decorator
 
1198
 
 
1199
 
 
1200
def dbus_interface_annotations(dbus_interface):
 
1201
    """Decorator for marking functions returning interface annotations
 
1202
 
 
1203
    Usage:
 
1204
 
 
1205
    @dbus_interface_annotations("org.example.Interface")
 
1206
    def _foo(self):  # Function name does not matter
 
1207
        return {"org.freedesktop.DBus.Deprecated": "true",
 
1208
                "org.freedesktop.DBus.Property.EmitsChangedSignal":
 
1209
                    "false"}
 
1210
    """
 
1211
 
 
1212
    def decorator(func):
 
1213
        func._dbus_is_interface = True
 
1214
        func._dbus_interface = dbus_interface
 
1215
        func._dbus_name = dbus_interface
 
1216
        return func
 
1217
 
 
1218
    return decorator
 
1219
 
 
1220
 
 
1221
def dbus_annotations(annotations):
 
1222
    """Decorator to annotate D-Bus methods, signals or properties
 
1223
    Usage:
 
1224
 
 
1225
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true",
 
1226
                       "org.freedesktop.DBus.Property."
 
1227
                       "EmitsChangedSignal": "false"})
 
1228
    @dbus_service_property("org.example.Interface", signature="b",
 
1229
                           access="r")
 
1230
    def Property_dbus_property(self):
 
1231
        return dbus.Boolean(False)
 
1232
 
 
1233
    See also the DBusObjectWithAnnotations class.
 
1234
    """
 
1235
 
 
1236
    def decorator(func):
 
1237
        func._dbus_annotations = annotations
 
1238
        return func
 
1239
 
 
1240
    return decorator
 
1241
 
 
1242
 
 
1243
class DBusPropertyException(dbus.exceptions.DBusException):
 
1244
    """A base class for D-Bus property-related exceptions
 
1245
    """
 
1246
    pass
 
1247
 
 
1248
 
 
1249
class DBusPropertyAccessException(DBusPropertyException):
 
1250
    """A property's access permissions disallows an operation.
 
1251
    """
 
1252
    pass
 
1253
 
 
1254
 
 
1255
class DBusPropertyNotFound(DBusPropertyException):
 
1256
    """An attempt was made to access a non-existing property.
 
1257
    """
 
1258
    pass
 
1259
 
 
1260
 
 
1261
class DBusObjectWithAnnotations(dbus.service.Object):
 
1262
    """A D-Bus object with annotations.
 
1263
 
 
1264
    Classes inheriting from this can use the dbus_annotations
 
1265
    decorator to add annotations to methods or signals.
 
1266
    """
 
1267
 
 
1268
    @staticmethod
 
1269
    def _is_dbus_thing(thing):
 
1270
        """Returns a function testing if an attribute is a D-Bus thing
 
1271
 
 
1272
        If called like _is_dbus_thing("method") it returns a function
 
1273
        suitable for use as predicate to inspect.getmembers().
 
1274
        """
 
1275
        return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),
 
1276
                                   False)
 
1277
 
 
1278
    def _get_all_dbus_things(self, thing):
 
1279
        """Returns a generator of (name, attribute) pairs
 
1280
        """
 
1281
        return ((getattr(athing.__get__(self), "_dbus_name", name),
 
1282
                 athing.__get__(self))
 
1283
                for cls in self.__class__.__mro__
 
1284
                for name, athing in
 
1285
                inspect.getmembers(cls, self._is_dbus_thing(thing)))
 
1286
 
 
1287
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
1288
                         out_signature="s",
 
1289
                         path_keyword='object_path',
 
1290
                         connection_keyword='connection')
 
1291
    def Introspect(self, object_path, connection):
 
1292
        """Overloading of standard D-Bus method.
 
1293
 
 
1294
        Inserts annotation tags on methods and signals.
 
1295
        """
 
1296
        xmlstring = dbus.service.Object.Introspect(self, object_path,
 
1297
                                                   connection)
 
1298
        try:
 
1299
            document = xml.dom.minidom.parseString(xmlstring)
 
1300
 
 
1301
            for if_tag in document.getElementsByTagName("interface"):
 
1302
                # Add annotation tags
 
1303
                for typ in ("method", "signal"):
 
1304
                    for tag in if_tag.getElementsByTagName(typ):
 
1305
                        annots = dict()
 
1306
                        for name, prop in (self.
 
1307
                                           _get_all_dbus_things(typ)):
 
1308
                            if (name == tag.getAttribute("name")
 
1309
                                and prop._dbus_interface
 
1310
                                == if_tag.getAttribute("name")):
 
1311
                                annots.update(getattr(
 
1312
                                    prop, "_dbus_annotations", {}))
 
1313
                        for name, value in annots.items():
 
1314
                            ann_tag = document.createElement(
 
1315
                                "annotation")
 
1316
                            ann_tag.setAttribute("name", name)
 
1317
                            ann_tag.setAttribute("value", value)
 
1318
                            tag.appendChild(ann_tag)
 
1319
                # Add interface annotation tags
 
1320
                for annotation, value in dict(
 
1321
                    itertools.chain.from_iterable(
 
1322
                        annotations().items()
 
1323
                        for name, annotations
 
1324
                        in self._get_all_dbus_things("interface")
 
1325
                        if name == if_tag.getAttribute("name")
 
1326
                        )).items():
 
1327
                    ann_tag = document.createElement("annotation")
 
1328
                    ann_tag.setAttribute("name", annotation)
 
1329
                    ann_tag.setAttribute("value", value)
 
1330
                    if_tag.appendChild(ann_tag)
 
1331
                # Fix argument name for the Introspect method itself
 
1332
                if (if_tag.getAttribute("name")
 
1333
                    == dbus.INTROSPECTABLE_IFACE):
 
1334
                    for cn in if_tag.getElementsByTagName("method"):
 
1335
                        if cn.getAttribute("name") == "Introspect":
 
1336
                            for arg in cn.getElementsByTagName("arg"):
 
1337
                                if (arg.getAttribute("direction")
 
1338
                                    == "out"):
 
1339
                                    arg.setAttribute("name",
 
1340
                                                     "xml_data")
 
1341
            xmlstring = document.toxml("utf-8")
 
1342
            document.unlink()
 
1343
        except (AttributeError, xml.dom.DOMException,
 
1344
                xml.parsers.expat.ExpatError) as error:
 
1345
            logger.error("Failed to override Introspection method",
 
1346
                         exc_info=error)
 
1347
        return xmlstring
 
1348
 
 
1349
 
 
1350
class DBusObjectWithProperties(DBusObjectWithAnnotations):
 
1351
    """A D-Bus object with properties.
 
1352
 
 
1353
    Classes inheriting from this can use the dbus_service_property
 
1354
    decorator to expose methods as D-Bus properties.  It exposes the
 
1355
    standard Get(), Set(), and GetAll() methods on the D-Bus.
 
1356
    """
 
1357
 
 
1358
    def _get_dbus_property(self, interface_name, property_name):
 
1359
        """Returns a bound method if one exists which is a D-Bus
 
1360
        property with the specified name and interface.
 
1361
        """
 
1362
        for cls in self.__class__.__mro__:
 
1363
            for name, value in inspect.getmembers(
 
1364
                    cls, self._is_dbus_thing("property")):
 
1365
                if (value._dbus_name == property_name
 
1366
                    and value._dbus_interface == interface_name):
 
1367
                    return value.__get__(self)
 
1368
 
 
1369
        # No such property
 
1370
        raise DBusPropertyNotFound("{}:{}.{}".format(
 
1371
            self.dbus_object_path, interface_name, property_name))
 
1372
 
 
1373
    @classmethod
 
1374
    def _get_all_interface_names(cls):
 
1375
        """Get a sequence of all interfaces supported by an object"""
 
1376
        return (name for name in set(getattr(getattr(x, attr),
 
1377
                                             "_dbus_interface", None)
 
1378
                                     for x in (inspect.getmro(cls))
 
1379
                                     for attr in dir(x))
 
1380
                if name is not None)
 
1381
 
 
1382
    @dbus.service.method(dbus.PROPERTIES_IFACE,
 
1383
                         in_signature="ss",
 
1384
                         out_signature="v")
 
1385
    def Get(self, interface_name, property_name):
 
1386
        """Standard D-Bus property Get() method, see D-Bus standard.
 
1387
        """
 
1388
        prop = self._get_dbus_property(interface_name, property_name)
 
1389
        if prop._dbus_access == "write":
 
1390
            raise DBusPropertyAccessException(property_name)
 
1391
        value = prop()
 
1392
        if not hasattr(value, "variant_level"):
 
1393
            return value
 
1394
        return type(value)(value, variant_level=value.variant_level+1)
 
1395
 
 
1396
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
 
1397
    def Set(self, interface_name, property_name, value):
 
1398
        """Standard D-Bus property Set() method, see D-Bus standard.
 
1399
        """
 
1400
        prop = self._get_dbus_property(interface_name, property_name)
 
1401
        if prop._dbus_access == "read":
 
1402
            raise DBusPropertyAccessException(property_name)
 
1403
        if prop._dbus_get_args_options["byte_arrays"]:
 
1404
            # The byte_arrays option is not supported yet on
 
1405
            # signatures other than "ay".
 
1406
            if prop._dbus_signature != "ay":
 
1407
                raise ValueError("Byte arrays not supported for non-"
 
1408
                                 "'ay' signature {!r}"
 
1409
                                 .format(prop._dbus_signature))
 
1410
            value = dbus.ByteArray(b''.join(chr(byte)
 
1411
                                            for byte in value))
 
1412
        prop(value)
 
1413
 
 
1414
    @dbus.service.method(dbus.PROPERTIES_IFACE,
 
1415
                         in_signature="s",
 
1416
                         out_signature="a{sv}")
 
1417
    def GetAll(self, interface_name):
 
1418
        """Standard D-Bus property GetAll() method, see D-Bus
 
1419
        standard.
 
1420
 
 
1421
        Note: Will not include properties with access="write".
 
1422
        """
 
1423
        properties = {}
 
1424
        for name, prop in self._get_all_dbus_things("property"):
 
1425
            if (interface_name
 
1426
                and interface_name != prop._dbus_interface):
 
1427
                # Interface non-empty but did not match
 
1428
                continue
 
1429
            # Ignore write-only properties
 
1430
            if prop._dbus_access == "write":
 
1431
                continue
 
1432
            value = prop()
 
1433
            if not hasattr(value, "variant_level"):
 
1434
                properties[name] = value
 
1435
                continue
 
1436
            properties[name] = type(value)(
 
1437
                value, variant_level=value.variant_level + 1)
 
1438
        return dbus.Dictionary(properties, signature="sv")
 
1439
 
 
1440
    @dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")
 
1441
    def PropertiesChanged(self, interface_name, changed_properties,
 
1442
                          invalidated_properties):
 
1443
        """Standard D-Bus PropertiesChanged() signal, see D-Bus
 
1444
        standard.
 
1445
        """
 
1446
        pass
 
1447
 
 
1448
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
1449
                         out_signature="s",
 
1450
                         path_keyword='object_path',
 
1451
                         connection_keyword='connection')
 
1452
    def Introspect(self, object_path, connection):
 
1453
        """Overloading of standard D-Bus method.
 
1454
 
 
1455
        Inserts property tags and interface annotation tags.
 
1456
        """
 
1457
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
 
1458
                                                         object_path,
 
1459
                                                         connection)
 
1460
        try:
 
1461
            document = xml.dom.minidom.parseString(xmlstring)
 
1462
 
 
1463
            def make_tag(document, name, prop):
 
1464
                e = document.createElement("property")
 
1465
                e.setAttribute("name", name)
 
1466
                e.setAttribute("type", prop._dbus_signature)
 
1467
                e.setAttribute("access", prop._dbus_access)
 
1468
                return e
 
1469
 
 
1470
            for if_tag in document.getElementsByTagName("interface"):
 
1471
                # Add property tags
 
1472
                for tag in (make_tag(document, name, prop)
 
1473
                            for name, prop
 
1474
                            in self._get_all_dbus_things("property")
 
1475
                            if prop._dbus_interface
 
1476
                            == if_tag.getAttribute("name")):
 
1477
                    if_tag.appendChild(tag)
 
1478
                # Add annotation tags for properties
 
1479
                for tag in if_tag.getElementsByTagName("property"):
 
1480
                    annots = dict()
 
1481
                    for name, prop in self._get_all_dbus_things(
 
1482
                            "property"):
 
1483
                        if (name == tag.getAttribute("name")
 
1484
                            and prop._dbus_interface
 
1485
                            == if_tag.getAttribute("name")):
 
1486
                            annots.update(getattr(
 
1487
                                prop, "_dbus_annotations", {}))
 
1488
                    for name, value in annots.items():
 
1489
                        ann_tag = document.createElement(
 
1490
                            "annotation")
 
1491
                        ann_tag.setAttribute("name", name)
 
1492
                        ann_tag.setAttribute("value", value)
 
1493
                        tag.appendChild(ann_tag)
 
1494
                # Add the names to the return values for the
 
1495
                # "org.freedesktop.DBus.Properties" methods
 
1496
                if (if_tag.getAttribute("name")
 
1497
                    == "org.freedesktop.DBus.Properties"):
 
1498
                    for cn in if_tag.getElementsByTagName("method"):
 
1499
                        if cn.getAttribute("name") == "Get":
 
1500
                            for arg in cn.getElementsByTagName("arg"):
 
1501
                                if (arg.getAttribute("direction")
 
1502
                                    == "out"):
 
1503
                                    arg.setAttribute("name", "value")
 
1504
                        elif cn.getAttribute("name") == "GetAll":
 
1505
                            for arg in cn.getElementsByTagName("arg"):
 
1506
                                if (arg.getAttribute("direction")
 
1507
                                    == "out"):
 
1508
                                    arg.setAttribute("name", "props")
 
1509
            xmlstring = document.toxml("utf-8")
 
1510
            document.unlink()
 
1511
        except (AttributeError, xml.dom.DOMException,
 
1512
                xml.parsers.expat.ExpatError) as error:
 
1513
            logger.error("Failed to override Introspection method",
 
1514
                         exc_info=error)
 
1515
        return xmlstring
 
1516
 
 
1517
 
 
1518
try:
 
1519
    dbus.OBJECT_MANAGER_IFACE
 
1520
except AttributeError:
 
1521
    dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"
 
1522
 
 
1523
 
 
1524
class DBusObjectWithObjectManager(DBusObjectWithAnnotations):
 
1525
    """A D-Bus object with an ObjectManager.
 
1526
 
 
1527
    Classes inheriting from this exposes the standard
 
1528
    GetManagedObjects call and the InterfacesAdded and
 
1529
    InterfacesRemoved signals on the standard
 
1530
    "org.freedesktop.DBus.ObjectManager" interface.
 
1531
 
 
1532
    Note: No signals are sent automatically; they must be sent
 
1533
    manually.
 
1534
    """
 
1535
    @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
 
1536
                         out_signature="a{oa{sa{sv}}}")
 
1537
    def GetManagedObjects(self):
 
1538
        """This function must be overridden"""
 
1539
        raise NotImplementedError()
 
1540
 
 
1541
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,
 
1542
                         signature="oa{sa{sv}}")
 
1543
    def InterfacesAdded(self, object_path, interfaces_and_properties):
 
1544
        pass
 
1545
 
 
1546
    @dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature="oas")
 
1547
    def InterfacesRemoved(self, object_path, interfaces):
 
1548
        pass
 
1549
 
 
1550
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
1551
                         out_signature="s",
 
1552
                         path_keyword='object_path',
 
1553
                         connection_keyword='connection')
 
1554
    def Introspect(self, object_path, connection):
 
1555
        """Overloading of standard D-Bus method.
 
1556
 
 
1557
        Override return argument name of GetManagedObjects to be
 
1558
        "objpath_interfaces_and_properties"
 
1559
        """
 
1560
        xmlstring = DBusObjectWithAnnotations.Introspect(self,
 
1561
                                                         object_path,
 
1562
                                                         connection)
 
1563
        try:
 
1564
            document = xml.dom.minidom.parseString(xmlstring)
 
1565
 
 
1566
            for if_tag in document.getElementsByTagName("interface"):
 
1567
                # Fix argument name for the GetManagedObjects method
 
1568
                if (if_tag.getAttribute("name")
 
1569
                    == dbus.OBJECT_MANAGER_IFACE):
 
1570
                    for cn in if_tag.getElementsByTagName("method"):
 
1571
                        if (cn.getAttribute("name")
 
1572
                            == "GetManagedObjects"):
 
1573
                            for arg in cn.getElementsByTagName("arg"):
 
1574
                                if (arg.getAttribute("direction")
 
1575
                                    == "out"):
 
1576
                                    arg.setAttribute(
 
1577
                                        "name",
 
1578
                                        "objpath_interfaces"
 
1579
                                        "_and_properties")
 
1580
            xmlstring = document.toxml("utf-8")
 
1581
            document.unlink()
 
1582
        except (AttributeError, xml.dom.DOMException,
 
1583
                xml.parsers.expat.ExpatError) as error:
 
1584
            logger.error("Failed to override Introspection method",
 
1585
                         exc_info=error)
 
1586
        return xmlstring
 
1587
 
 
1588
 
 
1589
def datetime_to_dbus(dt, variant_level=0):
 
1590
    """Convert a UTC datetime.datetime() to a D-Bus type."""
 
1591
    if dt is None:
 
1592
        return dbus.String("", variant_level=variant_level)
 
1593
    return dbus.String(dt.isoformat(), variant_level=variant_level)
 
1594
 
 
1595
 
 
1596
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
 
1597
    """A class decorator; applied to a subclass of
 
1598
    dbus.service.Object, it will add alternate D-Bus attributes with
 
1599
    interface names according to the "alt_interface_names" mapping.
 
1600
    Usage:
 
1601
 
 
1602
    @alternate_dbus_interfaces({"org.example.Interface":
 
1603
                                    "net.example.AlternateInterface"})
 
1604
    class SampleDBusObject(dbus.service.Object):
 
1605
        @dbus.service.method("org.example.Interface")
 
1606
        def SampleDBusMethod():
 
1607
            pass
 
1608
 
 
1609
    The above "SampleDBusMethod" on "SampleDBusObject" will be
 
1610
    reachable via two interfaces: "org.example.Interface" and
 
1611
    "net.example.AlternateInterface", the latter of which will have
 
1612
    its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
 
1613
    "true", unless "deprecate" is passed with a False value.
 
1614
 
 
1615
    This works for methods and signals, and also for D-Bus properties
 
1616
    (from DBusObjectWithProperties) and interfaces (from the
 
1617
    dbus_interface_annotations decorator).
 
1618
    """
 
1619
 
 
1620
    def wrapper(cls):
 
1621
        for orig_interface_name, alt_interface_name in (
 
1622
                alt_interface_names.items()):
 
1623
            attr = {}
 
1624
            interface_names = set()
 
1625
            # Go though all attributes of the class
 
1626
            for attrname, attribute in inspect.getmembers(cls):
 
1627
                # Ignore non-D-Bus attributes, and D-Bus attributes
 
1628
                # with the wrong interface name
 
1629
                if (not hasattr(attribute, "_dbus_interface")
 
1630
                    or not attribute._dbus_interface.startswith(
 
1631
                        orig_interface_name)):
 
1632
                    continue
 
1633
                # Create an alternate D-Bus interface name based on
 
1634
                # the current name
 
1635
                alt_interface = attribute._dbus_interface.replace(
 
1636
                    orig_interface_name, alt_interface_name)
 
1637
                interface_names.add(alt_interface)
 
1638
                # Is this a D-Bus signal?
 
1639
                if getattr(attribute, "_dbus_is_signal", False):
 
1640
                    # Extract the original non-method undecorated
 
1641
                    # function by black magic
 
1642
                    if sys.version_info.major == 2:
 
1643
                        nonmethod_func = (dict(
 
1644
                            zip(attribute.func_code.co_freevars,
 
1645
                                attribute.__closure__))
 
1646
                                          ["func"].cell_contents)
 
1647
                    else:
 
1648
                        nonmethod_func = (dict(
 
1649
                            zip(attribute.__code__.co_freevars,
 
1650
                                attribute.__closure__))
 
1651
                                          ["func"].cell_contents)
 
1652
                    # Create a new, but exactly alike, function
 
1653
                    # object, and decorate it to be a new D-Bus signal
 
1654
                    # with the alternate D-Bus interface name
 
1655
                    new_function = copy_function(nonmethod_func)
 
1656
                    new_function = (dbus.service.signal(
 
1657
                        alt_interface,
 
1658
                        attribute._dbus_signature)(new_function))
 
1659
                    # Copy annotations, if any
 
1660
                    try:
 
1661
                        new_function._dbus_annotations = dict(
 
1662
                            attribute._dbus_annotations)
 
1663
                    except AttributeError:
 
1664
                        pass
 
1665
 
 
1666
                    # Define a creator of a function to call both the
 
1667
                    # original and alternate functions, so both the
 
1668
                    # original and alternate signals gets sent when
 
1669
                    # the function is called
 
1670
                    def fixscope(func1, func2):
 
1671
                        """This function is a scope container to pass
 
1672
                        func1 and func2 to the "call_both" function
 
1673
                        outside of its arguments"""
 
1674
 
 
1675
                        @functools.wraps(func2)
 
1676
                        def call_both(*args, **kwargs):
 
1677
                            """This function will emit two D-Bus
 
1678
                            signals by calling func1 and func2"""
 
1679
                            func1(*args, **kwargs)
 
1680
                            func2(*args, **kwargs)
 
1681
                        # Make wrapper function look like a D-Bus
 
1682
                        # signal
 
1683
                        for name, attr in inspect.getmembers(func2):
 
1684
                            if name.startswith("_dbus_"):
 
1685
                                setattr(call_both, name, attr)
 
1686
 
 
1687
                        return call_both
 
1688
                    # Create the "call_both" function and add it to
 
1689
                    # the class
 
1690
                    attr[attrname] = fixscope(attribute, new_function)
 
1691
                # Is this a D-Bus method?
 
1692
                elif getattr(attribute, "_dbus_is_method", False):
 
1693
                    # Create a new, but exactly alike, function
 
1694
                    # object.  Decorate it to be a new D-Bus method
 
1695
                    # with the alternate D-Bus interface name.  Add it
 
1696
                    # to the class.
 
1697
                    attr[attrname] = (
 
1698
                        dbus.service.method(
 
1699
                            alt_interface,
 
1700
                            attribute._dbus_in_signature,
 
1701
                            attribute._dbus_out_signature)
 
1702
                        (copy_function(attribute)))
 
1703
                    # Copy annotations, if any
 
1704
                    try:
 
1705
                        attr[attrname]._dbus_annotations = dict(
 
1706
                            attribute._dbus_annotations)
 
1707
                    except AttributeError:
 
1708
                        pass
 
1709
                # Is this a D-Bus property?
 
1710
                elif getattr(attribute, "_dbus_is_property", False):
 
1711
                    # Create a new, but exactly alike, function
 
1712
                    # object, and decorate it to be a new D-Bus
 
1713
                    # property with the alternate D-Bus interface
 
1714
                    # name.  Add it to the class.
 
1715
                    attr[attrname] = (dbus_service_property(
 
1716
                        alt_interface, attribute._dbus_signature,
 
1717
                        attribute._dbus_access,
 
1718
                        attribute._dbus_get_args_options
 
1719
                        ["byte_arrays"])
 
1720
                                      (copy_function(attribute)))
 
1721
                    # Copy annotations, if any
 
1722
                    try:
 
1723
                        attr[attrname]._dbus_annotations = dict(
 
1724
                            attribute._dbus_annotations)
 
1725
                    except AttributeError:
 
1726
                        pass
 
1727
                # Is this a D-Bus interface?
 
1728
                elif getattr(attribute, "_dbus_is_interface", False):
 
1729
                    # Create a new, but exactly alike, function
 
1730
                    # object.  Decorate it to be a new D-Bus interface
 
1731
                    # with the alternate D-Bus interface name.  Add it
 
1732
                    # to the class.
 
1733
                    attr[attrname] = (
 
1734
                        dbus_interface_annotations(alt_interface)
 
1735
                        (copy_function(attribute)))
 
1736
            if deprecate:
 
1737
                # Deprecate all alternate interfaces
 
1738
                iname = "_AlternateDBusNames_interface_annotation{}"
 
1739
                for interface_name in interface_names:
 
1740
 
 
1741
                    @dbus_interface_annotations(interface_name)
 
1742
                    def func(self):
 
1743
                        return {"org.freedesktop.DBus.Deprecated":
 
1744
                                "true"}
 
1745
                    # Find an unused name
 
1746
                    for aname in (iname.format(i)
 
1747
                                  for i in itertools.count()):
 
1748
                        if aname not in attr:
 
1749
                            attr[aname] = func
 
1750
                            break
 
1751
            if interface_names:
 
1752
                # Replace the class with a new subclass of it with
 
1753
                # methods, signals, etc. as created above.
 
1754
                if sys.version_info.major == 2:
 
1755
                    cls = type(b"{}Alternate".format(cls.__name__),
 
1756
                               (cls, ), attr)
 
1757
                else:
 
1758
                    cls = type("{}Alternate".format(cls.__name__),
 
1759
                               (cls, ), attr)
 
1760
        return cls
 
1761
 
 
1762
    return wrapper
 
1763
 
 
1764
 
 
1765
@alternate_dbus_interfaces({"se.recompile.Mandos":
 
1766
                            "se.bsnet.fukt.Mandos"})
 
1767
class ClientDBus(Client, DBusObjectWithProperties):
 
1768
    """A Client class using D-Bus
 
1769
 
 
1770
    Attributes:
 
1771
    dbus_object_path: dbus.ObjectPath
 
1772
    bus: dbus.SystemBus()
 
1773
    """
 
1774
 
 
1775
    runtime_expansions = (Client.runtime_expansions
 
1776
                          + ("dbus_object_path", ))
 
1777
 
 
1778
    _interface = "se.recompile.Mandos.Client"
 
1779
 
 
1780
    # dbus.service.Object doesn't use super(), so we can't either.
 
1781
 
 
1782
    def __init__(self, bus=None, *args, **kwargs):
 
1783
        self.bus = bus
 
1784
        Client.__init__(self, *args, **kwargs)
 
1785
        # Only now, when this client is initialized, can it show up on
 
1786
        # the D-Bus
 
1787
        client_object_name = str(self.name).translate(
 
1788
            {ord("."): ord("_"),
 
1789
             ord("-"): ord("_")})
 
1790
        self.dbus_object_path = dbus.ObjectPath(
 
1791
            "/clients/" + client_object_name)
 
1792
        DBusObjectWithProperties.__init__(self, self.bus,
 
1793
                                          self.dbus_object_path)
 
1794
 
 
1795
    def notifychangeproperty(transform_func, dbus_name,
 
1796
                             type_func=lambda x: x,
 
1797
                             variant_level=1,
 
1798
                             invalidate_only=False,
 
1799
                             _interface=_interface):
 
1800
        """ Modify a variable so that it's a property which announces
 
1801
        its changes to DBus.
 
1802
 
 
1803
        transform_fun: Function that takes a value and a variant_level
 
1804
                       and transforms it to a D-Bus type.
 
1805
        dbus_name: D-Bus name of the variable
 
1806
        type_func: Function that transform the value before sending it
 
1807
                   to the D-Bus.  Default: no transform
 
1808
        variant_level: D-Bus variant level.  Default: 1
 
1809
        """
 
1810
        attrname = "_{}".format(dbus_name)
 
1811
 
 
1812
        def setter(self, value):
 
1813
            if hasattr(self, "dbus_object_path"):
 
1814
                if (not hasattr(self, attrname) or
 
1815
                    type_func(getattr(self, attrname, None))
 
1816
                    != type_func(value)):
 
1817
                    if invalidate_only:
 
1818
                        self.PropertiesChanged(
 
1819
                            _interface, dbus.Dictionary(),
 
1820
                            dbus.Array((dbus_name, )))
 
1821
                    else:
 
1822
                        dbus_value = transform_func(
 
1823
                            type_func(value),
 
1824
                            variant_level=variant_level)
 
1825
                        self.PropertyChanged(dbus.String(dbus_name),
 
1826
                                             dbus_value)
 
1827
                        self.PropertiesChanged(
 
1828
                            _interface,
 
1829
                            dbus.Dictionary({dbus.String(dbus_name):
 
1830
                                             dbus_value}),
 
1831
                            dbus.Array())
 
1832
            setattr(self, attrname, value)
 
1833
 
 
1834
        return property(lambda self: getattr(self, attrname), setter)
 
1835
 
 
1836
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
 
1837
    approvals_pending = notifychangeproperty(dbus.Boolean,
 
1838
                                             "ApprovalPending",
 
1839
                                             type_func=bool)
 
1840
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
 
1841
    last_enabled = notifychangeproperty(datetime_to_dbus,
 
1842
                                        "LastEnabled")
 
1843
    checker = notifychangeproperty(
 
1844
        dbus.Boolean, "CheckerRunning",
 
1845
        type_func=lambda checker: checker is not None)
 
1846
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
 
1847
                                           "LastCheckedOK")
 
1848
    last_checker_status = notifychangeproperty(dbus.Int16,
 
1849
                                               "LastCheckerStatus")
 
1850
    last_approval_request = notifychangeproperty(
 
1851
        datetime_to_dbus, "LastApprovalRequest")
 
1852
    approved_by_default = notifychangeproperty(dbus.Boolean,
 
1853
                                               "ApprovedByDefault")
 
1854
    approval_delay = notifychangeproperty(
 
1855
        dbus.UInt64, "ApprovalDelay",
 
1856
        type_func=lambda td: td.total_seconds() * 1000)
 
1857
    approval_duration = notifychangeproperty(
 
1858
        dbus.UInt64, "ApprovalDuration",
 
1859
        type_func=lambda td: td.total_seconds() * 1000)
 
1860
    host = notifychangeproperty(dbus.String, "Host")
 
1861
    timeout = notifychangeproperty(
 
1862
        dbus.UInt64, "Timeout",
 
1863
        type_func=lambda td: td.total_seconds() * 1000)
 
1864
    extended_timeout = notifychangeproperty(
 
1865
        dbus.UInt64, "ExtendedTimeout",
 
1866
        type_func=lambda td: td.total_seconds() * 1000)
 
1867
    interval = notifychangeproperty(
 
1868
        dbus.UInt64, "Interval",
 
1869
        type_func=lambda td: td.total_seconds() * 1000)
 
1870
    checker_command = notifychangeproperty(dbus.String, "Checker")
 
1871
    secret = notifychangeproperty(dbus.ByteArray, "Secret",
 
1872
                                  invalidate_only=True)
 
1873
 
 
1874
    del notifychangeproperty
 
1875
 
 
1876
    def __del__(self, *args, **kwargs):
 
1877
        try:
 
1878
            self.remove_from_connection()
 
1879
        except LookupError:
 
1880
            pass
 
1881
        if hasattr(DBusObjectWithProperties, "__del__"):
 
1882
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
 
1883
        Client.__del__(self, *args, **kwargs)
 
1884
 
 
1885
    def checker_callback(self, source, condition,
 
1886
                         connection, command, *args, **kwargs):
 
1887
        ret = Client.checker_callback(self, source, condition,
 
1888
                                      connection, command, *args,
 
1889
                                      **kwargs)
 
1890
        exitstatus = self.last_checker_status
 
1891
        if exitstatus >= 0:
 
1892
            # Emit D-Bus signal
 
1893
            self.CheckerCompleted(dbus.Int16(exitstatus),
 
1894
                                  # This is specific to GNU libC
 
1895
                                  dbus.Int64(exitstatus << 8),
 
1896
                                  dbus.String(command))
 
1897
        else:
 
1898
            # Emit D-Bus signal
 
1899
            self.CheckerCompleted(dbus.Int16(-1),
 
1900
                                  dbus.Int64(
 
1901
                                      # This is specific to GNU libC
 
1902
                                      (exitstatus << 8)
 
1903
                                      | self.last_checker_signal),
 
1904
                                  dbus.String(command))
 
1905
        return ret
 
1906
 
 
1907
    def start_checker(self, *args, **kwargs):
 
1908
        old_checker_pid = getattr(self.checker, "pid", None)
 
1909
        r = Client.start_checker(self, *args, **kwargs)
 
1910
        # Only if new checker process was started
 
1911
        if (self.checker is not None
 
1912
            and old_checker_pid != self.checker.pid):
 
1913
            # Emit D-Bus signal
 
1914
            self.CheckerStarted(self.current_checker_command)
 
1915
        return r
 
1916
 
 
1917
    def _reset_approved(self):
 
1918
        self.approved = None
 
1919
        return False
 
1920
 
 
1921
    def approve(self, value=True):
 
1922
        self.approved = value
 
1923
        GLib.timeout_add(int(self.approval_duration.total_seconds()
 
1924
                             * 1000), self._reset_approved)
 
1925
        self.send_changedstate()
 
1926
 
 
1927
    #  D-Bus methods, signals & properties
 
1928
 
 
1929
    #  Interfaces
 
1930
 
 
1931
    #  Signals
 
1932
 
 
1933
    # CheckerCompleted - signal
 
1934
    @dbus.service.signal(_interface, signature="nxs")
 
1935
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
1936
        "D-Bus signal"
 
1937
        pass
 
1938
 
 
1939
    # CheckerStarted - signal
 
1940
    @dbus.service.signal(_interface, signature="s")
 
1941
    def CheckerStarted(self, command):
 
1942
        "D-Bus signal"
 
1943
        pass
 
1944
 
 
1945
    # PropertyChanged - signal
 
1946
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1947
    @dbus.service.signal(_interface, signature="sv")
 
1948
    def PropertyChanged(self, property, value):
 
1949
        "D-Bus signal"
 
1950
        pass
 
1951
 
 
1952
    # GotSecret - signal
 
1953
    @dbus.service.signal(_interface)
 
1954
    def GotSecret(self):
 
1955
        """D-Bus signal
 
1956
        Is sent after a successful transfer of secret from the Mandos
 
1957
        server to mandos-client
 
1958
        """
 
1959
        pass
 
1960
 
 
1961
    # Rejected - signal
 
1962
    @dbus.service.signal(_interface, signature="s")
 
1963
    def Rejected(self, reason):
 
1964
        "D-Bus signal"
 
1965
        pass
 
1966
 
 
1967
    # NeedApproval - signal
 
1968
    @dbus.service.signal(_interface, signature="tb")
 
1969
    def NeedApproval(self, timeout, default):
 
1970
        "D-Bus signal"
 
1971
        return self.need_approval()
 
1972
 
 
1973
    #  Methods
 
1974
 
 
1975
    # Approve - method
 
1976
    @dbus.service.method(_interface, in_signature="b")
 
1977
    def Approve(self, value):
 
1978
        self.approve(value)
 
1979
 
 
1980
    # CheckedOK - method
 
1981
    @dbus.service.method(_interface)
 
1982
    def CheckedOK(self):
 
1983
        self.checked_ok()
 
1984
 
 
1985
    # Enable - method
 
1986
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1987
    @dbus.service.method(_interface)
 
1988
    def Enable(self):
 
1989
        "D-Bus method"
 
1990
        self.enable()
 
1991
 
 
1992
    # StartChecker - method
 
1993
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
1994
    @dbus.service.method(_interface)
 
1995
    def StartChecker(self):
 
1996
        "D-Bus method"
 
1997
        self.start_checker()
 
1998
 
 
1999
    # Disable - method
 
2000
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
2001
    @dbus.service.method(_interface)
 
2002
    def Disable(self):
 
2003
        "D-Bus method"
 
2004
        self.disable()
 
2005
 
 
2006
    # StopChecker - method
 
2007
    @dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
 
2008
    @dbus.service.method(_interface)
 
2009
    def StopChecker(self):
 
2010
        self.stop_checker()
 
2011
 
 
2012
    #  Properties
 
2013
 
 
2014
    # ApprovalPending - property
 
2015
    @dbus_service_property(_interface, signature="b", access="read")
 
2016
    def ApprovalPending_dbus_property(self):
 
2017
        return dbus.Boolean(bool(self.approvals_pending))
 
2018
 
 
2019
    # ApprovedByDefault - property
 
2020
    @dbus_service_property(_interface,
 
2021
                           signature="b",
 
2022
                           access="readwrite")
 
2023
    def ApprovedByDefault_dbus_property(self, value=None):
 
2024
        if value is None:       # get
 
2025
            return dbus.Boolean(self.approved_by_default)
 
2026
        self.approved_by_default = bool(value)
 
2027
 
 
2028
    # ApprovalDelay - property
 
2029
    @dbus_service_property(_interface,
 
2030
                           signature="t",
 
2031
                           access="readwrite")
 
2032
    def ApprovalDelay_dbus_property(self, value=None):
 
2033
        if value is None:       # get
 
2034
            return dbus.UInt64(self.approval_delay.total_seconds()
 
2035
                               * 1000)
 
2036
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
 
2037
 
 
2038
    # ApprovalDuration - property
 
2039
    @dbus_service_property(_interface,
 
2040
                           signature="t",
 
2041
                           access="readwrite")
 
2042
    def ApprovalDuration_dbus_property(self, value=None):
 
2043
        if value is None:       # get
 
2044
            return dbus.UInt64(self.approval_duration.total_seconds()
 
2045
                               * 1000)
 
2046
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
 
2047
 
 
2048
    # Name - property
 
2049
    @dbus_annotations(
 
2050
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
 
2051
    @dbus_service_property(_interface, signature="s", access="read")
 
2052
    def Name_dbus_property(self):
 
2053
        return dbus.String(self.name)
 
2054
 
 
2055
    # KeyID - property
 
2056
    @dbus_annotations(
 
2057
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
 
2058
    @dbus_service_property(_interface, signature="s", access="read")
 
2059
    def KeyID_dbus_property(self):
 
2060
        return dbus.String(self.key_id)
 
2061
 
 
2062
    # Fingerprint - property
 
2063
    @dbus_annotations(
 
2064
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
 
2065
    @dbus_service_property(_interface, signature="s", access="read")
 
2066
    def Fingerprint_dbus_property(self):
 
2067
        return dbus.String(self.fingerprint)
 
2068
 
 
2069
    # Host - property
 
2070
    @dbus_service_property(_interface,
 
2071
                           signature="s",
 
2072
                           access="readwrite")
 
2073
    def Host_dbus_property(self, value=None):
 
2074
        if value is None:       # get
 
2075
            return dbus.String(self.host)
 
2076
        self.host = str(value)
 
2077
 
 
2078
    # Created - property
 
2079
    @dbus_annotations(
 
2080
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
 
2081
    @dbus_service_property(_interface, signature="s", access="read")
 
2082
    def Created_dbus_property(self):
 
2083
        return datetime_to_dbus(self.created)
 
2084
 
 
2085
    # LastEnabled - property
 
2086
    @dbus_service_property(_interface, signature="s", access="read")
 
2087
    def LastEnabled_dbus_property(self):
 
2088
        return datetime_to_dbus(self.last_enabled)
 
2089
 
 
2090
    # Enabled - property
 
2091
    @dbus_service_property(_interface,
 
2092
                           signature="b",
 
2093
                           access="readwrite")
 
2094
    def Enabled_dbus_property(self, value=None):
 
2095
        if value is None:       # get
 
2096
            return dbus.Boolean(self.enabled)
 
2097
        if value:
 
2098
            self.enable()
 
2099
        else:
 
2100
            self.disable()
 
2101
 
 
2102
    # LastCheckedOK - property
 
2103
    @dbus_service_property(_interface,
 
2104
                           signature="s",
 
2105
                           access="readwrite")
 
2106
    def LastCheckedOK_dbus_property(self, value=None):
 
2107
        if value is not None:
 
2108
            self.checked_ok()
 
2109
            return
 
2110
        return datetime_to_dbus(self.last_checked_ok)
 
2111
 
 
2112
    # LastCheckerStatus - property
 
2113
    @dbus_service_property(_interface, signature="n", access="read")
 
2114
    def LastCheckerStatus_dbus_property(self):
 
2115
        return dbus.Int16(self.last_checker_status)
 
2116
 
 
2117
    # Expires - property
 
2118
    @dbus_service_property(_interface, signature="s", access="read")
 
2119
    def Expires_dbus_property(self):
 
2120
        return datetime_to_dbus(self.expires)
 
2121
 
 
2122
    # LastApprovalRequest - property
 
2123
    @dbus_service_property(_interface, signature="s", access="read")
 
2124
    def LastApprovalRequest_dbus_property(self):
 
2125
        return datetime_to_dbus(self.last_approval_request)
 
2126
 
 
2127
    # Timeout - property
 
2128
    @dbus_service_property(_interface,
 
2129
                           signature="t",
 
2130
                           access="readwrite")
 
2131
    def Timeout_dbus_property(self, value=None):
 
2132
        if value is None:       # get
 
2133
            return dbus.UInt64(self.timeout.total_seconds() * 1000)
 
2134
        old_timeout = self.timeout
 
2135
        self.timeout = datetime.timedelta(0, 0, 0, value)
 
2136
        # Reschedule disabling
 
2137
        if self.enabled:
 
2138
            now = datetime.datetime.utcnow()
 
2139
            self.expires += self.timeout - old_timeout
 
2140
            if self.expires <= now:
 
2141
                # The timeout has passed
 
2142
                self.disable()
 
2143
            else:
 
2144
                if (getattr(self, "disable_initiator_tag", None)
 
2145
                    is None):
 
2146
                    return
 
2147
                GLib.source_remove(self.disable_initiator_tag)
 
2148
                self.disable_initiator_tag = GLib.timeout_add(
 
2149
                    int((self.expires - now).total_seconds() * 1000),
 
2150
                    self.disable)
 
2151
 
 
2152
    # ExtendedTimeout - property
 
2153
    @dbus_service_property(_interface,
 
2154
                           signature="t",
 
2155
                           access="readwrite")
 
2156
    def ExtendedTimeout_dbus_property(self, value=None):
 
2157
        if value is None:       # get
 
2158
            return dbus.UInt64(self.extended_timeout.total_seconds()
 
2159
                               * 1000)
 
2160
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
 
2161
 
 
2162
    # Interval - property
 
2163
    @dbus_service_property(_interface,
 
2164
                           signature="t",
 
2165
                           access="readwrite")
 
2166
    def Interval_dbus_property(self, value=None):
 
2167
        if value is None:       # get
 
2168
            return dbus.UInt64(self.interval.total_seconds() * 1000)
 
2169
        self.interval = datetime.timedelta(0, 0, 0, value)
 
2170
        if getattr(self, "checker_initiator_tag", None) is None:
 
2171
            return
 
2172
        if self.enabled:
 
2173
            # Reschedule checker run
 
2174
            GLib.source_remove(self.checker_initiator_tag)
 
2175
            self.checker_initiator_tag = GLib.timeout_add(
 
2176
                value, self.start_checker)
 
2177
            self.start_checker()  # Start one now, too
 
2178
 
 
2179
    # Checker - property
 
2180
    @dbus_service_property(_interface,
 
2181
                           signature="s",
 
2182
                           access="readwrite")
 
2183
    def Checker_dbus_property(self, value=None):
 
2184
        if value is None:       # get
 
2185
            return dbus.String(self.checker_command)
 
2186
        self.checker_command = str(value)
 
2187
 
 
2188
    # CheckerRunning - property
 
2189
    @dbus_service_property(_interface,
 
2190
                           signature="b",
 
2191
                           access="readwrite")
 
2192
    def CheckerRunning_dbus_property(self, value=None):
 
2193
        if value is None:       # get
 
2194
            return dbus.Boolean(self.checker is not None)
 
2195
        if value:
 
2196
            self.start_checker()
 
2197
        else:
 
2198
            self.stop_checker()
 
2199
 
 
2200
    # ObjectPath - property
 
2201
    @dbus_annotations(
 
2202
        {"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",
 
2203
         "org.freedesktop.DBus.Deprecated": "true"})
 
2204
    @dbus_service_property(_interface, signature="o", access="read")
 
2205
    def ObjectPath_dbus_property(self):
 
2206
        return self.dbus_object_path  # is already a dbus.ObjectPath
 
2207
 
 
2208
    # Secret = property
 
2209
    @dbus_annotations(
 
2210
        {"org.freedesktop.DBus.Property.EmitsChangedSignal":
 
2211
         "invalidates"})
 
2212
    @dbus_service_property(_interface,
 
2213
                           signature="ay",
 
2214
                           access="write",
 
2215
                           byte_arrays=True)
 
2216
    def Secret_dbus_property(self, value):
 
2217
        self.secret = bytes(value)
 
2218
 
 
2219
    del _interface
 
2220
 
 
2221
 
 
2222
class ProxyClient(object):
 
2223
    def __init__(self, child_pipe, key_id, fpr, address):
 
2224
        self._pipe = child_pipe
 
2225
        self._pipe.send(('init', key_id, fpr, address))
 
2226
        if not self._pipe.recv():
 
2227
            raise KeyError(key_id or fpr)
 
2228
 
 
2229
    def __getattribute__(self, name):
 
2230
        if name == '_pipe':
 
2231
            return super(ProxyClient, self).__getattribute__(name)
 
2232
        self._pipe.send(('getattr', name))
 
2233
        data = self._pipe.recv()
 
2234
        if data[0] == 'data':
 
2235
            return data[1]
 
2236
        if data[0] == 'function':
 
2237
 
 
2238
            def func(*args, **kwargs):
 
2239
                self._pipe.send(('funcall', name, args, kwargs))
 
2240
                return self._pipe.recv()[1]
 
2241
 
 
2242
            return func
 
2243
 
 
2244
    def __setattr__(self, name, value):
 
2245
        if name == '_pipe':
 
2246
            return super(ProxyClient, self).__setattr__(name, value)
 
2247
        self._pipe.send(('setattr', name, value))
 
2248
 
 
2249
 
 
2250
class ClientHandler(socketserver.BaseRequestHandler, object):
 
2251
    """A class to handle client connections.
 
2252
 
 
2253
    Instantiated once for each connection to handle it.
442
2254
    Note: This will run in its own forked process."""
443
 
    
 
2255
 
444
2256
    def handle(self):
445
 
        logger.info(u"TCP connection from: %s",
446
 
                     unicode(self.client_address))
447
 
        session = gnutls.connection.ClientSession\
448
 
                  (self.request, gnutls.connection.X509Credentials())
449
 
        
450
 
        line = self.request.makefile().readline()
451
 
        logger.debug(u"Protocol version: %r", line)
452
 
        try:
453
 
            if int(line.strip().split()[0]) > 1:
454
 
                raise RuntimeError
455
 
        except (ValueError, IndexError, RuntimeError), error:
456
 
            logger.error(u"Unknown protocol version: %s", error)
457
 
            return
458
 
        
459
 
        # Note: gnutls.connection.X509Credentials is really a generic
460
 
        # GnuTLS certificate credentials object so long as no X.509
461
 
        # keys are added to it.  Therefore, we can use it here despite
462
 
        # using OpenPGP certificates.
463
 
        
464
 
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
465
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
466
 
        #                "+DHE-DSS"))
467
 
        priority = "NORMAL"             # Fallback default, since this
468
 
                                        # MUST be set.
469
 
        if self.server.settings["priority"]:
470
 
            priority = self.server.settings["priority"]
471
 
        gnutls.library.functions.gnutls_priority_set_direct\
472
 
            (session._c_object, priority, None);
473
 
        
474
 
        try:
475
 
            session.handshake()
476
 
        except gnutls.errors.GNUTLSError, error:
477
 
            logger.warning(u"Handshake failed: %s", error)
478
 
            # Do not run session.bye() here: the session is not
479
 
            # established.  Just abandon the request.
480
 
            return
481
 
        try:
482
 
            fpr = fingerprint(peer_certificate(session))
483
 
        except (TypeError, gnutls.errors.GNUTLSError), error:
484
 
            logger.warning(u"Bad certificate: %s", error)
485
 
            session.bye()
486
 
            return
487
 
        logger.debug(u"Fingerprint: %s", fpr)
488
 
        client = None
489
 
        for c in self.server.clients:
490
 
            if c.fingerprint == fpr:
491
 
                client = c
492
 
                break
493
 
        if not client:
494
 
            logger.warning(u"Client not found for fingerprint: %s",
495
 
                           fpr)
496
 
            session.bye()
497
 
            return
498
 
        # Have to check if client.still_valid(), since it is possible
499
 
        # that the client timed out while establishing the GnuTLS
500
 
        # session.
501
 
        if not client.still_valid():
502
 
            logger.warning(u"Client %(name)s is invalid",
503
 
                           vars(client))
504
 
            session.bye()
505
 
            return
506
 
        sent_size = 0
507
 
        while sent_size < len(client.secret):
508
 
            sent = session.send(client.secret[sent_size:])
509
 
            logger.debug(u"Sent: %d, remaining: %d",
510
 
                         sent, len(client.secret)
511
 
                         - (sent_size + sent))
512
 
            sent_size += sent
513
 
        session.bye()
514
 
 
515
 
 
516
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
517
 
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
2257
        with contextlib.closing(self.server.child_pipe) as child_pipe:
 
2258
            logger.info("TCP connection from: %s",
 
2259
                        str(self.client_address))
 
2260
            logger.debug("Pipe FD: %d",
 
2261
                         self.server.child_pipe.fileno())
 
2262
 
 
2263
            session = gnutls.ClientSession(self.request)
 
2264
 
 
2265
            # priority = ':'.join(("NONE", "+VERS-TLS1.1",
 
2266
            #                       "+AES-256-CBC", "+SHA1",
 
2267
            #                       "+COMP-NULL", "+CTYPE-OPENPGP",
 
2268
            #                       "+DHE-DSS"))
 
2269
            # Use a fallback default, since this MUST be set.
 
2270
            priority = self.server.gnutls_priority
 
2271
            if priority is None:
 
2272
                priority = "NORMAL"
 
2273
            gnutls.priority_set_direct(session._c_object,
 
2274
                                       priority.encode("utf-8"),
 
2275
                                       None)
 
2276
 
 
2277
            # Start communication using the Mandos protocol
 
2278
            # Get protocol number
 
2279
            line = self.request.makefile().readline()
 
2280
            logger.debug("Protocol version: %r", line)
 
2281
            try:
 
2282
                if int(line.strip().split()[0]) > 1:
 
2283
                    raise RuntimeError(line)
 
2284
            except (ValueError, IndexError, RuntimeError) as error:
 
2285
                logger.error("Unknown protocol version: %s", error)
 
2286
                return
 
2287
 
 
2288
            # Start GnuTLS connection
 
2289
            try:
 
2290
                session.handshake()
 
2291
            except gnutls.Error as error:
 
2292
                logger.warning("Handshake failed: %s", error)
 
2293
                # Do not run session.bye() here: the session is not
 
2294
                # established.  Just abandon the request.
 
2295
                return
 
2296
            logger.debug("Handshake succeeded")
 
2297
 
 
2298
            approval_required = False
 
2299
            try:
 
2300
                if gnutls.has_rawpk:
 
2301
                    fpr = ""
 
2302
                    try:
 
2303
                        key_id = self.key_id(
 
2304
                            self.peer_certificate(session))
 
2305
                    except (TypeError, gnutls.Error) as error:
 
2306
                        logger.warning("Bad certificate: %s", error)
 
2307
                        return
 
2308
                    logger.debug("Key ID: %s", key_id)
 
2309
 
 
2310
                else:
 
2311
                    key_id = ""
 
2312
                    try:
 
2313
                        fpr = self.fingerprint(
 
2314
                            self.peer_certificate(session))
 
2315
                    except (TypeError, gnutls.Error) as error:
 
2316
                        logger.warning("Bad certificate: %s", error)
 
2317
                        return
 
2318
                    logger.debug("Fingerprint: %s", fpr)
 
2319
 
 
2320
                try:
 
2321
                    client = ProxyClient(child_pipe, key_id, fpr,
 
2322
                                         self.client_address)
 
2323
                except KeyError:
 
2324
                    return
 
2325
 
 
2326
                if client.approval_delay:
 
2327
                    delay = client.approval_delay
 
2328
                    client.approvals_pending += 1
 
2329
                    approval_required = True
 
2330
 
 
2331
                while True:
 
2332
                    if not client.enabled:
 
2333
                        logger.info("Client %s is disabled",
 
2334
                                    client.name)
 
2335
                        if self.server.use_dbus:
 
2336
                            # Emit D-Bus signal
 
2337
                            client.Rejected("Disabled")
 
2338
                        return
 
2339
 
 
2340
                    if client.approved or not client.approval_delay:
 
2341
                        # We are approved or approval is disabled
 
2342
                        break
 
2343
                    elif client.approved is None:
 
2344
                        logger.info("Client %s needs approval",
 
2345
                                    client.name)
 
2346
                        if self.server.use_dbus:
 
2347
                            # Emit D-Bus signal
 
2348
                            client.NeedApproval(
 
2349
                                client.approval_delay.total_seconds()
 
2350
                                * 1000, client.approved_by_default)
 
2351
                    else:
 
2352
                        logger.warning("Client %s was not approved",
 
2353
                                       client.name)
 
2354
                        if self.server.use_dbus:
 
2355
                            # Emit D-Bus signal
 
2356
                            client.Rejected("Denied")
 
2357
                        return
 
2358
 
 
2359
                    # wait until timeout or approved
 
2360
                    time = datetime.datetime.now()
 
2361
                    client.changedstate.acquire()
 
2362
                    client.changedstate.wait(delay.total_seconds())
 
2363
                    client.changedstate.release()
 
2364
                    time2 = datetime.datetime.now()
 
2365
                    if (time2 - time) >= delay:
 
2366
                        if not client.approved_by_default:
 
2367
                            logger.warning("Client %s timed out while"
 
2368
                                           " waiting for approval",
 
2369
                                           client.name)
 
2370
                            if self.server.use_dbus:
 
2371
                                # Emit D-Bus signal
 
2372
                                client.Rejected("Approval timed out")
 
2373
                            return
 
2374
                        else:
 
2375
                            break
 
2376
                    else:
 
2377
                        delay -= time2 - time
 
2378
 
 
2379
                try:
 
2380
                    session.send(client.secret)
 
2381
                except gnutls.Error as error:
 
2382
                    logger.warning("gnutls send failed",
 
2383
                                   exc_info=error)
 
2384
                    return
 
2385
 
 
2386
                logger.info("Sending secret to %s", client.name)
 
2387
                # bump the timeout using extended_timeout
 
2388
                client.bump_timeout(client.extended_timeout)
 
2389
                if self.server.use_dbus:
 
2390
                    # Emit D-Bus signal
 
2391
                    client.GotSecret()
 
2392
 
 
2393
            finally:
 
2394
                if approval_required:
 
2395
                    client.approvals_pending -= 1
 
2396
                try:
 
2397
                    session.bye()
 
2398
                except gnutls.Error as error:
 
2399
                    logger.warning("GnuTLS bye failed",
 
2400
                                   exc_info=error)
 
2401
 
 
2402
    @staticmethod
 
2403
    def peer_certificate(session):
 
2404
        "Return the peer's certificate as a bytestring"
 
2405
        try:
 
2406
            cert_type = gnutls.certificate_type_get2(session._c_object,
 
2407
                                                     gnutls.CTYPE_PEERS)
 
2408
        except AttributeError:
 
2409
            cert_type = gnutls.certificate_type_get(session._c_object)
 
2410
        if gnutls.has_rawpk:
 
2411
            valid_cert_types = frozenset((gnutls.CRT_RAWPK,))
 
2412
        else:
 
2413
            valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))
 
2414
        # If not a valid certificate type...
 
2415
        if cert_type not in valid_cert_types:
 
2416
            logger.info("Cert type %r not in %r", cert_type,
 
2417
                        valid_cert_types)
 
2418
            # ...return invalid data
 
2419
            return b""
 
2420
        list_size = ctypes.c_uint(1)
 
2421
        cert_list = (gnutls.certificate_get_peers
 
2422
                     (session._c_object, ctypes.byref(list_size)))
 
2423
        if not bool(cert_list) and list_size.value != 0:
 
2424
            raise gnutls.Error("error getting peer certificate")
 
2425
        if list_size.value == 0:
 
2426
            return None
 
2427
        cert = cert_list[0]
 
2428
        return ctypes.string_at(cert.data, cert.size)
 
2429
 
 
2430
    @staticmethod
 
2431
    def key_id(certificate):
 
2432
        "Convert a certificate bytestring to a hexdigit key ID"
 
2433
        # New GnuTLS "datum" with the public key
 
2434
        datum = gnutls.datum_t(
 
2435
            ctypes.cast(ctypes.c_char_p(certificate),
 
2436
                        ctypes.POINTER(ctypes.c_ubyte)),
 
2437
            ctypes.c_uint(len(certificate)))
 
2438
        # XXX all these need to be created in the gnutls "module"
 
2439
        # New empty GnuTLS certificate
 
2440
        pubkey = gnutls.pubkey_t()
 
2441
        gnutls.pubkey_init(ctypes.byref(pubkey))
 
2442
        # Import the raw public key into the certificate
 
2443
        gnutls.pubkey_import(pubkey,
 
2444
                             ctypes.byref(datum),
 
2445
                             gnutls.X509_FMT_DER)
 
2446
        # New buffer for the key ID
 
2447
        buf = ctypes.create_string_buffer(32)
 
2448
        buf_len = ctypes.c_size_t(len(buf))
 
2449
        # Get the key ID from the raw public key into the buffer
 
2450
        gnutls.pubkey_get_key_id(pubkey,
 
2451
                                 gnutls.KEYID_USE_SHA256,
 
2452
                                 ctypes.cast(ctypes.byref(buf),
 
2453
                                             ctypes.POINTER(ctypes.c_ubyte)),
 
2454
                                 ctypes.byref(buf_len))
 
2455
        # Deinit the certificate
 
2456
        gnutls.pubkey_deinit(pubkey)
 
2457
 
 
2458
        # Convert the buffer to a Python bytestring
 
2459
        key_id = ctypes.string_at(buf, buf_len.value)
 
2460
        # Convert the bytestring to hexadecimal notation
 
2461
        hex_key_id = binascii.hexlify(key_id).upper()
 
2462
        return hex_key_id
 
2463
 
 
2464
    @staticmethod
 
2465
    def fingerprint(openpgp):
 
2466
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
 
2467
        # New GnuTLS "datum" with the OpenPGP public key
 
2468
        datum = gnutls.datum_t(
 
2469
            ctypes.cast(ctypes.c_char_p(openpgp),
 
2470
                        ctypes.POINTER(ctypes.c_ubyte)),
 
2471
            ctypes.c_uint(len(openpgp)))
 
2472
        # New empty GnuTLS certificate
 
2473
        crt = gnutls.openpgp_crt_t()
 
2474
        gnutls.openpgp_crt_init(ctypes.byref(crt))
 
2475
        # Import the OpenPGP public key into the certificate
 
2476
        gnutls.openpgp_crt_import(crt, ctypes.byref(datum),
 
2477
                                  gnutls.OPENPGP_FMT_RAW)
 
2478
        # Verify the self signature in the key
 
2479
        crtverify = ctypes.c_uint()
 
2480
        gnutls.openpgp_crt_verify_self(crt, 0,
 
2481
                                       ctypes.byref(crtverify))
 
2482
        if crtverify.value != 0:
 
2483
            gnutls.openpgp_crt_deinit(crt)
 
2484
            raise gnutls.CertificateSecurityError(code
 
2485
                                                  =crtverify.value)
 
2486
        # New buffer for the fingerprint
 
2487
        buf = ctypes.create_string_buffer(20)
 
2488
        buf_len = ctypes.c_size_t()
 
2489
        # Get the fingerprint from the certificate into the buffer
 
2490
        gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
2491
                                           ctypes.byref(buf_len))
 
2492
        # Deinit the certificate
 
2493
        gnutls.openpgp_crt_deinit(crt)
 
2494
        # Convert the buffer to a Python bytestring
 
2495
        fpr = ctypes.string_at(buf, buf_len.value)
 
2496
        # Convert the bytestring to hexadecimal notation
 
2497
        hex_fpr = binascii.hexlify(fpr).upper()
 
2498
        return hex_fpr
 
2499
 
 
2500
 
 
2501
class MultiprocessingMixIn(object):
 
2502
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
 
2503
 
 
2504
    def sub_process_main(self, request, address):
 
2505
        try:
 
2506
            self.finish_request(request, address)
 
2507
        except Exception:
 
2508
            self.handle_error(request, address)
 
2509
        self.close_request(request)
 
2510
 
 
2511
    def process_request(self, request, address):
 
2512
        """Start a new process to process the request."""
 
2513
        proc = multiprocessing.Process(target=self.sub_process_main,
 
2514
                                       args=(request, address))
 
2515
        proc.start()
 
2516
        return proc
 
2517
 
 
2518
 
 
2519
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
 
2520
    """ adds a pipe to the MixIn """
 
2521
 
 
2522
    def process_request(self, request, client_address):
 
2523
        """Overrides and wraps the original process_request().
 
2524
 
 
2525
        This function creates a new pipe in self.pipe
 
2526
        """
 
2527
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
 
2528
 
 
2529
        proc = MultiprocessingMixIn.process_request(self, request,
 
2530
                                                    client_address)
 
2531
        self.child_pipe.close()
 
2532
        self.add_pipe(parent_pipe, proc)
 
2533
 
 
2534
    def add_pipe(self, parent_pipe, proc):
 
2535
        """Dummy function; override as necessary"""
 
2536
        raise NotImplementedError()
 
2537
 
 
2538
 
 
2539
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
 
2540
                     socketserver.TCPServer, object):
 
2541
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
2542
 
518
2543
    Attributes:
519
 
        settings:       Server settings
520
 
        clients:        Set() of Client objects
521
2544
        enabled:        Boolean; whether this server is activated yet
 
2545
        interface:      None or a network interface name (string)
 
2546
        use_ipv6:       Boolean; to use IPv6 or not
522
2547
    """
523
 
    address_family = socket.AF_INET6
524
 
    def __init__(self, *args, **kwargs):
525
 
        if "settings" in kwargs:
526
 
            self.settings = kwargs["settings"]
527
 
            del kwargs["settings"]
528
 
        if "clients" in kwargs:
529
 
            self.clients = kwargs["clients"]
530
 
            del kwargs["clients"]
531
 
        self.enabled = False
532
 
        return super(type(self), self).__init__(*args, **kwargs)
 
2548
 
 
2549
    def __init__(self, server_address, RequestHandlerClass,
 
2550
                 interface=None,
 
2551
                 use_ipv6=True,
 
2552
                 socketfd=None):
 
2553
        """If socketfd is set, use that file descriptor instead of
 
2554
        creating a new one with socket.socket().
 
2555
        """
 
2556
        self.interface = interface
 
2557
        if use_ipv6:
 
2558
            self.address_family = socket.AF_INET6
 
2559
        if socketfd is not None:
 
2560
            # Save the file descriptor
 
2561
            self.socketfd = socketfd
 
2562
            # Save the original socket.socket() function
 
2563
            self.socket_socket = socket.socket
 
2564
 
 
2565
            # To implement --socket, we monkey patch socket.socket.
 
2566
            #
 
2567
            # (When socketserver.TCPServer is a new-style class, we
 
2568
            # could make self.socket into a property instead of monkey
 
2569
            # patching socket.socket.)
 
2570
            #
 
2571
            # Create a one-time-only replacement for socket.socket()
 
2572
            @functools.wraps(socket.socket)
 
2573
            def socket_wrapper(*args, **kwargs):
 
2574
                # Restore original function so subsequent calls are
 
2575
                # not affected.
 
2576
                socket.socket = self.socket_socket
 
2577
                del self.socket_socket
 
2578
                # This time only, return a new socket object from the
 
2579
                # saved file descriptor.
 
2580
                return socket.fromfd(self.socketfd, *args, **kwargs)
 
2581
            # Replace socket.socket() function with wrapper
 
2582
            socket.socket = socket_wrapper
 
2583
        # The socketserver.TCPServer.__init__ will call
 
2584
        # socket.socket(), which might be our replacement,
 
2585
        # socket_wrapper(), if socketfd was set.
 
2586
        socketserver.TCPServer.__init__(self, server_address,
 
2587
                                        RequestHandlerClass)
 
2588
 
533
2589
    def server_bind(self):
534
2590
        """This overrides the normal server_bind() function
535
2591
        to bind to an interface if one was specified, and also NOT to
536
2592
        bind to an address or port if they were not specified."""
537
 
        if self.settings["interface"]:
538
 
            # 25 is from /usr/include/asm-i486/socket.h
539
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
2593
        global SO_BINDTODEVICE
 
2594
        if self.interface is not None:
 
2595
            if SO_BINDTODEVICE is None:
 
2596
                # Fall back to a hard-coded value which seems to be
 
2597
                # common enough.
 
2598
                logger.warning("SO_BINDTODEVICE not found, trying 25")
 
2599
                SO_BINDTODEVICE = 25
540
2600
            try:
541
 
                self.socket.setsockopt(socket.SOL_SOCKET,
542
 
                                       SO_BINDTODEVICE,
543
 
                                       self.settings["interface"])
544
 
            except socket.error, error:
545
 
                if error[0] == errno.EPERM:
546
 
                    logger.error(u"No permission to"
547
 
                                 u" bind to interface %s",
548
 
                                 self.settings["interface"])
 
2601
                self.socket.setsockopt(
 
2602
                    socket.SOL_SOCKET, SO_BINDTODEVICE,
 
2603
                    (self.interface + "\0").encode("utf-8"))
 
2604
            except socket.error as error:
 
2605
                if error.errno == errno.EPERM:
 
2606
                    logger.error("No permission to bind to"
 
2607
                                 " interface %s", self.interface)
 
2608
                elif error.errno == errno.ENOPROTOOPT:
 
2609
                    logger.error("SO_BINDTODEVICE not available;"
 
2610
                                 " cannot bind to interface %s",
 
2611
                                 self.interface)
 
2612
                elif error.errno == errno.ENODEV:
 
2613
                    logger.error("Interface %s does not exist,"
 
2614
                                 " cannot bind", self.interface)
549
2615
                else:
550
 
                    raise error
 
2616
                    raise
551
2617
        # Only bind(2) the socket if we really need to.
552
2618
        if self.server_address[0] or self.server_address[1]:
553
2619
            if not self.server_address[0]:
554
 
                in6addr_any = "::"
555
 
                self.server_address = (in6addr_any,
 
2620
                if self.address_family == socket.AF_INET6:
 
2621
                    any_address = "::"  # in6addr_any
 
2622
                else:
 
2623
                    any_address = "0.0.0.0"  # INADDR_ANY
 
2624
                self.server_address = (any_address,
556
2625
                                       self.server_address[1])
557
2626
            elif not self.server_address[1]:
558
 
                self.server_address = (self.server_address[0],
559
 
                                       0)
560
 
#                 if self.settings["interface"]:
 
2627
                self.server_address = (self.server_address[0], 0)
 
2628
#                 if self.interface:
561
2629
#                     self.server_address = (self.server_address[0],
562
2630
#                                            0, # port
563
2631
#                                            0, # flowinfo
564
2632
#                                            if_nametoindex
565
 
#                                            (self.settings
566
 
#                                             ["interface"]))
567
 
            return super(type(self), self).server_bind()
 
2633
#                                            (self.interface))
 
2634
            return socketserver.TCPServer.server_bind(self)
 
2635
 
 
2636
 
 
2637
class MandosServer(IPv6_TCPServer):
 
2638
    """Mandos server.
 
2639
 
 
2640
    Attributes:
 
2641
        clients:        set of Client objects
 
2642
        gnutls_priority GnuTLS priority string
 
2643
        use_dbus:       Boolean; to emit D-Bus signals or not
 
2644
 
 
2645
    Assumes a GLib.MainLoop event loop.
 
2646
    """
 
2647
 
 
2648
    def __init__(self, server_address, RequestHandlerClass,
 
2649
                 interface=None,
 
2650
                 use_ipv6=True,
 
2651
                 clients=None,
 
2652
                 gnutls_priority=None,
 
2653
                 use_dbus=True,
 
2654
                 socketfd=None):
 
2655
        self.enabled = False
 
2656
        self.clients = clients
 
2657
        if self.clients is None:
 
2658
            self.clients = {}
 
2659
        self.use_dbus = use_dbus
 
2660
        self.gnutls_priority = gnutls_priority
 
2661
        IPv6_TCPServer.__init__(self, server_address,
 
2662
                                RequestHandlerClass,
 
2663
                                interface=interface,
 
2664
                                use_ipv6=use_ipv6,
 
2665
                                socketfd=socketfd)
 
2666
 
568
2667
    def server_activate(self):
569
2668
        if self.enabled:
570
 
            return super(type(self), self).server_activate()
 
2669
            return socketserver.TCPServer.server_activate(self)
 
2670
 
571
2671
    def enable(self):
572
2672
        self.enabled = True
573
2673
 
 
2674
    def add_pipe(self, parent_pipe, proc):
 
2675
        # Call "handle_ipc" for both data and EOF events
 
2676
        GLib.io_add_watch(
 
2677
            parent_pipe.fileno(),
 
2678
            GLib.IO_IN | GLib.IO_HUP,
 
2679
            functools.partial(self.handle_ipc,
 
2680
                              parent_pipe=parent_pipe,
 
2681
                              proc=proc))
 
2682
 
 
2683
    def handle_ipc(self, source, condition,
 
2684
                   parent_pipe=None,
 
2685
                   proc=None,
 
2686
                   client_object=None):
 
2687
        # error, or the other end of multiprocessing.Pipe has closed
 
2688
        if condition & (GLib.IO_ERR | GLib.IO_HUP):
 
2689
            # Wait for other process to exit
 
2690
            proc.join()
 
2691
            return False
 
2692
 
 
2693
        # Read a request from the child
 
2694
        request = parent_pipe.recv()
 
2695
        command = request[0]
 
2696
 
 
2697
        if command == 'init':
 
2698
            key_id = request[1].decode("ascii")
 
2699
            fpr = request[2].decode("ascii")
 
2700
            address = request[3]
 
2701
 
 
2702
            for c in self.clients.values():
 
2703
                if key_id and c.key_id == key_id:
 
2704
                    client = c
 
2705
                    break
 
2706
                if fpr and c.fingerprint == fpr:
 
2707
                    client = c
 
2708
                    break
 
2709
            else:
 
2710
                logger.info("Client not found for key ID: %s, address"
 
2711
                            ": %s", key_id or fpr, address)
 
2712
                if self.use_dbus:
 
2713
                    # Emit D-Bus signal
 
2714
                    mandos_dbus_service.ClientNotFound(key_id or fpr,
 
2715
                                                       address[0])
 
2716
                parent_pipe.send(False)
 
2717
                return False
 
2718
 
 
2719
            GLib.io_add_watch(
 
2720
                parent_pipe.fileno(),
 
2721
                GLib.IO_IN | GLib.IO_HUP,
 
2722
                functools.partial(self.handle_ipc,
 
2723
                                  parent_pipe=parent_pipe,
 
2724
                                  proc=proc,
 
2725
                                  client_object=client))
 
2726
            parent_pipe.send(True)
 
2727
            # remove the old hook in favor of the new above hook on
 
2728
            # same fileno
 
2729
            return False
 
2730
        if command == 'funcall':
 
2731
            funcname = request[1]
 
2732
            args = request[2]
 
2733
            kwargs = request[3]
 
2734
 
 
2735
            parent_pipe.send(('data', getattr(client_object,
 
2736
                                              funcname)(*args,
 
2737
                                                        **kwargs)))
 
2738
 
 
2739
        if command == 'getattr':
 
2740
            attrname = request[1]
 
2741
            if isinstance(client_object.__getattribute__(attrname),
 
2742
                          collections.Callable):
 
2743
                parent_pipe.send(('function', ))
 
2744
            else:
 
2745
                parent_pipe.send((
 
2746
                    'data', client_object.__getattribute__(attrname)))
 
2747
 
 
2748
        if command == 'setattr':
 
2749
            attrname = request[1]
 
2750
            value = request[2]
 
2751
            setattr(client_object, attrname, value)
 
2752
 
 
2753
        return True
 
2754
 
 
2755
 
 
2756
def rfc3339_duration_to_delta(duration):
 
2757
    """Parse an RFC 3339 "duration" and return a datetime.timedelta
 
2758
 
 
2759
    >>> rfc3339_duration_to_delta("P7D")
 
2760
    datetime.timedelta(7)
 
2761
    >>> rfc3339_duration_to_delta("PT60S")
 
2762
    datetime.timedelta(0, 60)
 
2763
    >>> rfc3339_duration_to_delta("PT60M")
 
2764
    datetime.timedelta(0, 3600)
 
2765
    >>> rfc3339_duration_to_delta("PT24H")
 
2766
    datetime.timedelta(1)
 
2767
    >>> rfc3339_duration_to_delta("P1W")
 
2768
    datetime.timedelta(7)
 
2769
    >>> rfc3339_duration_to_delta("PT5M30S")
 
2770
    datetime.timedelta(0, 330)
 
2771
    >>> rfc3339_duration_to_delta("P1DT3M20S")
 
2772
    datetime.timedelta(1, 200)
 
2773
    """
 
2774
 
 
2775
    # Parsing an RFC 3339 duration with regular expressions is not
 
2776
    # possible - there would have to be multiple places for the same
 
2777
    # values, like seconds.  The current code, while more esoteric, is
 
2778
    # cleaner without depending on a parsing library.  If Python had a
 
2779
    # built-in library for parsing we would use it, but we'd like to
 
2780
    # avoid excessive use of external libraries.
 
2781
 
 
2782
    # New type for defining tokens, syntax, and semantics all-in-one
 
2783
    Token = collections.namedtuple("Token", (
 
2784
        "regexp",  # To match token; if "value" is not None, must have
 
2785
                   # a "group" containing digits
 
2786
        "value",   # datetime.timedelta or None
 
2787
        "followers"))           # Tokens valid after this token
 
2788
    # RFC 3339 "duration" tokens, syntax, and semantics; taken from
 
2789
    # the "duration" ABNF definition in RFC 3339, Appendix A.
 
2790
    token_end = Token(re.compile(r"$"), None, frozenset())
 
2791
    token_second = Token(re.compile(r"(\d+)S"),
 
2792
                         datetime.timedelta(seconds=1),
 
2793
                         frozenset((token_end, )))
 
2794
    token_minute = Token(re.compile(r"(\d+)M"),
 
2795
                         datetime.timedelta(minutes=1),
 
2796
                         frozenset((token_second, token_end)))
 
2797
    token_hour = Token(re.compile(r"(\d+)H"),
 
2798
                       datetime.timedelta(hours=1),
 
2799
                       frozenset((token_minute, token_end)))
 
2800
    token_time = Token(re.compile(r"T"),
 
2801
                       None,
 
2802
                       frozenset((token_hour, token_minute,
 
2803
                                  token_second)))
 
2804
    token_day = Token(re.compile(r"(\d+)D"),
 
2805
                      datetime.timedelta(days=1),
 
2806
                      frozenset((token_time, token_end)))
 
2807
    token_month = Token(re.compile(r"(\d+)M"),
 
2808
                        datetime.timedelta(weeks=4),
 
2809
                        frozenset((token_day, token_end)))
 
2810
    token_year = Token(re.compile(r"(\d+)Y"),
 
2811
                       datetime.timedelta(weeks=52),
 
2812
                       frozenset((token_month, token_end)))
 
2813
    token_week = Token(re.compile(r"(\d+)W"),
 
2814
                       datetime.timedelta(weeks=1),
 
2815
                       frozenset((token_end, )))
 
2816
    token_duration = Token(re.compile(r"P"), None,
 
2817
                           frozenset((token_year, token_month,
 
2818
                                      token_day, token_time,
 
2819
                                      token_week)))
 
2820
    # Define starting values:
 
2821
    # Value so far
 
2822
    value = datetime.timedelta()
 
2823
    found_token = None
 
2824
    # Following valid tokens
 
2825
    followers = frozenset((token_duration, ))
 
2826
    # String left to parse
 
2827
    s = duration
 
2828
    # Loop until end token is found
 
2829
    while found_token is not token_end:
 
2830
        # Search for any currently valid tokens
 
2831
        for token in followers:
 
2832
            match = token.regexp.match(s)
 
2833
            if match is not None:
 
2834
                # Token found
 
2835
                if token.value is not None:
 
2836
                    # Value found, parse digits
 
2837
                    factor = int(match.group(1), 10)
 
2838
                    # Add to value so far
 
2839
                    value += factor * token.value
 
2840
                # Strip token from string
 
2841
                s = token.regexp.sub("", s, 1)
 
2842
                # Go to found token
 
2843
                found_token = token
 
2844
                # Set valid next tokens
 
2845
                followers = found_token.followers
 
2846
                break
 
2847
        else:
 
2848
            # No currently valid tokens were found
 
2849
            raise ValueError("Invalid RFC 3339 duration: {!r}"
 
2850
                             .format(duration))
 
2851
    # End token found
 
2852
    return value
 
2853
 
574
2854
 
575
2855
def string_to_delta(interval):
576
2856
    """Parse a string and return a datetime.timedelta
583
2863
    datetime.timedelta(0, 3600)
584
2864
    >>> string_to_delta('24h')
585
2865
    datetime.timedelta(1)
586
 
    >>> string_to_delta(u'1w')
 
2866
    >>> string_to_delta('1w')
587
2867
    datetime.timedelta(7)
588
2868
    >>> string_to_delta('5m 30s')
589
2869
    datetime.timedelta(0, 330)
590
2870
    """
 
2871
 
 
2872
    try:
 
2873
        return rfc3339_duration_to_delta(interval)
 
2874
    except ValueError:
 
2875
        pass
 
2876
 
591
2877
    timevalue = datetime.timedelta(0)
592
2878
    for s in interval.split():
593
2879
        try:
594
 
            suffix=unicode(s[-1])
595
 
            value=int(s[:-1])
596
 
            if suffix == u"d":
 
2880
            suffix = s[-1]
 
2881
            value = int(s[:-1])
 
2882
            if suffix == "d":
597
2883
                delta = datetime.timedelta(value)
598
 
            elif suffix == u"s":
 
2884
            elif suffix == "s":
599
2885
                delta = datetime.timedelta(0, value)
600
 
            elif suffix == u"m":
 
2886
            elif suffix == "m":
601
2887
                delta = datetime.timedelta(0, 0, 0, 0, value)
602
 
            elif suffix == u"h":
 
2888
            elif suffix == "h":
603
2889
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
604
 
            elif suffix == u"w":
 
2890
            elif suffix == "w":
605
2891
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
606
2892
            else:
607
 
                raise ValueError
608
 
        except (ValueError, IndexError):
609
 
            raise ValueError
 
2893
                raise ValueError("Unknown suffix {!r}".format(suffix))
 
2894
        except IndexError as e:
 
2895
            raise ValueError(*(e.args))
610
2896
        timevalue += delta
611
2897
    return timevalue
612
2898
 
613
2899
 
614
 
def server_state_changed(state):
615
 
    """Derived from the Avahi example code"""
616
 
    if state == avahi.SERVER_COLLISION:
617
 
        logger.error(u"Zeroconf server name collision")
618
 
        service.remove()
619
 
    elif state == avahi.SERVER_RUNNING:
620
 
        service.add()
621
 
 
622
 
 
623
 
def entry_group_state_changed(state, error):
624
 
    """Derived from the Avahi example code"""
625
 
    logger.debug(u"Avahi state change: %i", state)
626
 
    
627
 
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
628
 
        logger.debug(u"Zeroconf service established.")
629
 
    elif state == avahi.ENTRY_GROUP_COLLISION:
630
 
        logger.warning(u"Zeroconf service name collision.")
631
 
        service.rename()
632
 
    elif state == avahi.ENTRY_GROUP_FAILURE:
633
 
        logger.critical(u"Avahi: Error in group state changed %s",
634
 
                        unicode(error))
635
 
        raise AvahiGroupError("State changed: %s", str(error))
636
 
 
637
 
def if_nametoindex(interface):
638
 
    """Call the C function if_nametoindex(), or equivalent"""
639
 
    global if_nametoindex
640
 
    try:
641
 
        if "ctypes.util" not in sys.modules:
642
 
            import ctypes.util
643
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
644
 
            (ctypes.util.find_library("c")).if_nametoindex
645
 
    except (OSError, AttributeError):
646
 
        if "struct" not in sys.modules:
647
 
            import struct
648
 
        if "fcntl" not in sys.modules:
649
 
            import fcntl
650
 
        def if_nametoindex(interface):
651
 
            "Get an interface index the hard way, i.e. using fcntl()"
652
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
653
 
            s = socket.socket()
654
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
655
 
                                struct.pack("16s16x", interface))
656
 
            s.close()
657
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
658
 
            return interface_index
659
 
    return if_nametoindex(interface)
660
 
 
661
 
 
662
 
def daemon(nochdir = False, noclose = False):
 
2900
def daemon(nochdir=False, noclose=False):
663
2901
    """See daemon(3).  Standard BSD Unix function.
 
2902
 
664
2903
    This should really exist as os.daemon, but it doesn't (yet)."""
665
2904
    if os.fork():
666
2905
        sys.exit()
671
2910
        sys.exit()
672
2911
    if not noclose:
673
2912
        # Close all standard open file descriptors
674
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
2913
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
675
2914
        if not stat.S_ISCHR(os.fstat(null).st_mode):
676
2915
            raise OSError(errno.ENODEV,
677
 
                          "/dev/null not a character device")
 
2916
                          "{} not a character device"
 
2917
                          .format(os.devnull))
678
2918
        os.dup2(null, sys.stdin.fileno())
679
2919
        os.dup2(null, sys.stdout.fileno())
680
2920
        os.dup2(null, sys.stderr.fileno())
683
2923
 
684
2924
 
685
2925
def main():
686
 
    global main_loop_started
687
 
    main_loop_started = False
688
 
    
689
 
    parser = OptionParser(version = "%%prog %s" % version)
690
 
    parser.add_option("-i", "--interface", type="string",
691
 
                      metavar="IF", help="Bind to interface IF")
692
 
    parser.add_option("-a", "--address", type="string",
693
 
                      help="Address to listen for requests on")
694
 
    parser.add_option("-p", "--port", type="int",
695
 
                      help="Port number to receive requests on")
696
 
    parser.add_option("--check", action="store_true", default=False,
697
 
                      help="Run self-test")
698
 
    parser.add_option("--debug", action="store_true",
699
 
                      help="Debug mode; run in foreground and log to"
700
 
                      " terminal")
701
 
    parser.add_option("--priority", type="string", help="GnuTLS"
702
 
                      " priority string (see GnuTLS documentation)")
703
 
    parser.add_option("--servicename", type="string", metavar="NAME",
704
 
                      help="Zeroconf service name")
705
 
    parser.add_option("--configdir", type="string",
706
 
                      default="/etc/mandos", metavar="DIR",
707
 
                      help="Directory to search for configuration"
708
 
                      " files")
709
 
    (options, args) = parser.parse_args()
710
 
    
 
2926
 
 
2927
    ##################################################################
 
2928
    # Parsing of options, both command line and config file
 
2929
 
 
2930
    parser = argparse.ArgumentParser()
 
2931
    parser.add_argument("-v", "--version", action="version",
 
2932
                        version="%(prog)s {}".format(version),
 
2933
                        help="show version number and exit")
 
2934
    parser.add_argument("-i", "--interface", metavar="IF",
 
2935
                        help="Bind to interface IF")
 
2936
    parser.add_argument("-a", "--address",
 
2937
                        help="Address to listen for requests on")
 
2938
    parser.add_argument("-p", "--port", type=int,
 
2939
                        help="Port number to receive requests on")
 
2940
    parser.add_argument("--check", action="store_true",
 
2941
                        help="Run self-test")
 
2942
    parser.add_argument("--debug", action="store_true",
 
2943
                        help="Debug mode; run in foreground and log"
 
2944
                        " to terminal", default=None)
 
2945
    parser.add_argument("--debuglevel", metavar="LEVEL",
 
2946
                        help="Debug level for stdout output")
 
2947
    parser.add_argument("--priority", help="GnuTLS"
 
2948
                        " priority string (see GnuTLS documentation)")
 
2949
    parser.add_argument("--servicename",
 
2950
                        metavar="NAME", help="Zeroconf service name")
 
2951
    parser.add_argument("--configdir",
 
2952
                        default="/etc/mandos", metavar="DIR",
 
2953
                        help="Directory to search for configuration"
 
2954
                        " files")
 
2955
    parser.add_argument("--no-dbus", action="store_false",
 
2956
                        dest="use_dbus", help="Do not provide D-Bus"
 
2957
                        " system bus interface", default=None)
 
2958
    parser.add_argument("--no-ipv6", action="store_false",
 
2959
                        dest="use_ipv6", help="Do not use IPv6",
 
2960
                        default=None)
 
2961
    parser.add_argument("--no-restore", action="store_false",
 
2962
                        dest="restore", help="Do not restore stored"
 
2963
                        " state", default=None)
 
2964
    parser.add_argument("--socket", type=int,
 
2965
                        help="Specify a file descriptor to a network"
 
2966
                        " socket to use instead of creating one")
 
2967
    parser.add_argument("--statedir", metavar="DIR",
 
2968
                        help="Directory to save/restore state in")
 
2969
    parser.add_argument("--foreground", action="store_true",
 
2970
                        help="Run in foreground", default=None)
 
2971
    parser.add_argument("--no-zeroconf", action="store_false",
 
2972
                        dest="zeroconf", help="Do not use Zeroconf",
 
2973
                        default=None)
 
2974
 
 
2975
    options = parser.parse_args()
 
2976
 
711
2977
    if options.check:
712
2978
        import doctest
713
 
        doctest.testmod()
714
 
        sys.exit()
715
 
    
 
2979
        fail_count, test_count = doctest.testmod()
 
2980
        sys.exit(os.EX_OK if fail_count == 0 else 1)
 
2981
 
716
2982
    # Default values for config file for server-global settings
717
 
    server_defaults = { "interface": "",
718
 
                        "address": "",
719
 
                        "port": "",
720
 
                        "debug": "False",
721
 
                        "priority":
722
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
723
 
                        "servicename": "Mandos",
724
 
                        }
725
 
    
 
2983
    if gnutls.has_rawpk:
 
2984
        priority = ("SECURE128:!CTYPE-X.509:+CTYPE-RAWPK:!RSA"
 
2985
                    ":!VERS-ALL:+VERS-TLS1.3:%PROFILE_ULTRA")
 
2986
    else:
 
2987
        priority = ("SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"
 
2988
                    ":+SIGN-DSA-SHA256")
 
2989
    server_defaults = {"interface": "",
 
2990
                       "address": "",
 
2991
                       "port": "",
 
2992
                       "debug": "False",
 
2993
                       "priority": priority,
 
2994
                       "servicename": "Mandos",
 
2995
                       "use_dbus": "True",
 
2996
                       "use_ipv6": "True",
 
2997
                       "debuglevel": "",
 
2998
                       "restore": "True",
 
2999
                       "socket": "",
 
3000
                       "statedir": "/var/lib/mandos",
 
3001
                       "foreground": "False",
 
3002
                       "zeroconf": "True",
 
3003
                       }
 
3004
    del priority
 
3005
 
726
3006
    # Parse config file for server-global settings
727
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
3007
    server_config = configparser.SafeConfigParser(server_defaults)
728
3008
    del server_defaults
729
3009
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
730
3010
    # Convert the SafeConfigParser object to a dict
731
3011
    server_settings = server_config.defaults()
732
 
    # Use getboolean on the boolean config option
733
 
    server_settings["debug"] = server_config.getboolean\
734
 
                               ("DEFAULT", "debug")
 
3012
    # Use the appropriate methods on the non-string config options
 
3013
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
 
3014
                   "foreground", "zeroconf"):
 
3015
        server_settings[option] = server_config.getboolean("DEFAULT",
 
3016
                                                           option)
 
3017
    if server_settings["port"]:
 
3018
        server_settings["port"] = server_config.getint("DEFAULT",
 
3019
                                                       "port")
 
3020
    if server_settings["socket"]:
 
3021
        server_settings["socket"] = server_config.getint("DEFAULT",
 
3022
                                                         "socket")
 
3023
        # Later, stdin will, and stdout and stderr might, be dup'ed
 
3024
        # over with an opened os.devnull.  But we don't want this to
 
3025
        # happen with a supplied network socket.
 
3026
        if 0 <= server_settings["socket"] <= 2:
 
3027
            server_settings["socket"] = os.dup(server_settings
 
3028
                                               ["socket"])
735
3029
    del server_config
736
 
    
 
3030
 
737
3031
    # Override the settings from the config file with command line
738
3032
    # options, if set.
739
3033
    for option in ("interface", "address", "port", "debug",
740
 
                   "priority", "servicename", "configdir"):
 
3034
                   "priority", "servicename", "configdir", "use_dbus",
 
3035
                   "use_ipv6", "debuglevel", "restore", "statedir",
 
3036
                   "socket", "foreground", "zeroconf"):
741
3037
        value = getattr(options, option)
742
3038
        if value is not None:
743
3039
            server_settings[option] = value
744
3040
    del options
 
3041
    # Force all strings to be unicode
 
3042
    for option in server_settings.keys():
 
3043
        if isinstance(server_settings[option], bytes):
 
3044
            server_settings[option] = (server_settings[option]
 
3045
                                       .decode("utf-8"))
 
3046
    # Force all boolean options to be boolean
 
3047
    for option in ("debug", "use_dbus", "use_ipv6", "restore",
 
3048
                   "foreground", "zeroconf"):
 
3049
        server_settings[option] = bool(server_settings[option])
 
3050
    # Debug implies foreground
 
3051
    if server_settings["debug"]:
 
3052
        server_settings["foreground"] = True
745
3053
    # Now we have our good server settings in "server_settings"
746
 
    
 
3054
 
 
3055
    ##################################################################
 
3056
 
 
3057
    if (not server_settings["zeroconf"]
 
3058
        and not (server_settings["port"]
 
3059
                 or server_settings["socket"] != "")):
 
3060
        parser.error("Needs port or socket to work without Zeroconf")
 
3061
 
 
3062
    # For convenience
747
3063
    debug = server_settings["debug"]
748
 
    
749
 
    if not debug:
750
 
        syslogger.setLevel(logging.WARNING)
751
 
        console.setLevel(logging.WARNING)
752
 
    
 
3064
    debuglevel = server_settings["debuglevel"]
 
3065
    use_dbus = server_settings["use_dbus"]
 
3066
    use_ipv6 = server_settings["use_ipv6"]
 
3067
    stored_state_path = os.path.join(server_settings["statedir"],
 
3068
                                     stored_state_file)
 
3069
    foreground = server_settings["foreground"]
 
3070
    zeroconf = server_settings["zeroconf"]
 
3071
 
 
3072
    if debug:
 
3073
        initlogger(debug, logging.DEBUG)
 
3074
    else:
 
3075
        if not debuglevel:
 
3076
            initlogger(debug)
 
3077
        else:
 
3078
            level = getattr(logging, debuglevel.upper())
 
3079
            initlogger(debug, level)
 
3080
 
753
3081
    if server_settings["servicename"] != "Mandos":
754
 
        syslogger.setFormatter(logging.Formatter\
755
 
                               ('Mandos (%s): %%(levelname)s:'
756
 
                                ' %%(message)s'
757
 
                                % server_settings["servicename"]))
758
 
    
 
3082
        syslogger.setFormatter(
 
3083
            logging.Formatter('Mandos ({}) [%(process)d]:'
 
3084
                              ' %(levelname)s: %(message)s'.format(
 
3085
                                  server_settings["servicename"])))
 
3086
 
759
3087
    # Parse config file with clients
760
 
    client_defaults = { "timeout": "1h",
761
 
                        "interval": "5m",
762
 
                        "checker": "fping -q -- %(host)s",
763
 
                        "host": "",
764
 
                        }
765
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
 
3088
    client_config = configparser.SafeConfigParser(Client
 
3089
                                                  .client_defaults)
766
3090
    client_config.read(os.path.join(server_settings["configdir"],
767
3091
                                    "clients.conf"))
768
 
    
769
 
    clients = Set()
770
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
771
 
                                 server_settings["port"]),
772
 
                                tcp_handler,
773
 
                                settings=server_settings,
774
 
                                clients=clients)
775
 
    pidfilename = "/var/run/mandos.pid"
776
 
    try:
777
 
        pidfile = open(pidfilename, "w")
778
 
    except IOError, error:
779
 
        logger.error("Could not open file %r", pidfilename)
780
 
    
781
 
    uid = 65534
782
 
    gid = 65534
783
 
    try:
784
 
        uid = pwd.getpwnam("mandos").pw_uid
785
 
    except KeyError:
786
 
        try:
787
 
            uid = pwd.getpwnam("nobody").pw_uid
788
 
        except KeyError:
789
 
            pass
790
 
    try:
791
 
        gid = pwd.getpwnam("mandos").pw_gid
792
 
    except KeyError:
793
 
        try:
794
 
            gid = pwd.getpwnam("nogroup").pw_gid
795
 
        except KeyError:
796
 
            pass
797
 
    try:
 
3092
 
 
3093
    global mandos_dbus_service
 
3094
    mandos_dbus_service = None
 
3095
 
 
3096
    socketfd = None
 
3097
    if server_settings["socket"] != "":
 
3098
        socketfd = server_settings["socket"]
 
3099
    tcp_server = MandosServer(
 
3100
        (server_settings["address"], server_settings["port"]),
 
3101
        ClientHandler,
 
3102
        interface=(server_settings["interface"] or None),
 
3103
        use_ipv6=use_ipv6,
 
3104
        gnutls_priority=server_settings["priority"],
 
3105
        use_dbus=use_dbus,
 
3106
        socketfd=socketfd)
 
3107
    if not foreground:
 
3108
        pidfilename = "/run/mandos.pid"
 
3109
        if not os.path.isdir("/run/."):
 
3110
            pidfilename = "/var/run/mandos.pid"
 
3111
        pidfile = None
 
3112
        try:
 
3113
            pidfile = codecs.open(pidfilename, "w", encoding="utf-8")
 
3114
        except IOError as e:
 
3115
            logger.error("Could not open file %r", pidfilename,
 
3116
                         exc_info=e)
 
3117
 
 
3118
    for name, group in (("_mandos", "_mandos"),
 
3119
                        ("mandos", "mandos"),
 
3120
                        ("nobody", "nogroup")):
 
3121
        try:
 
3122
            uid = pwd.getpwnam(name).pw_uid
 
3123
            gid = pwd.getpwnam(group).pw_gid
 
3124
            break
 
3125
        except KeyError:
 
3126
            continue
 
3127
    else:
 
3128
        uid = 65534
 
3129
        gid = 65534
 
3130
    try:
 
3131
        os.setgid(gid)
798
3132
        os.setuid(uid)
799
 
        os.setgid(gid)
800
 
    except OSError, error:
801
 
        if error[0] != errno.EPERM:
802
 
            raise error
803
 
    
804
 
    global service
805
 
    service = AvahiService(name = server_settings["servicename"],
806
 
                           type = "_mandos._tcp", );
807
 
    if server_settings["interface"]:
808
 
        service.interface = if_nametoindex\
809
 
                            (server_settings["interface"])
810
 
    
 
3133
        if debug:
 
3134
            logger.debug("Did setuid/setgid to {}:{}".format(uid,
 
3135
                                                             gid))
 
3136
    except OSError as error:
 
3137
        logger.warning("Failed to setuid/setgid to {}:{}: {}"
 
3138
                       .format(uid, gid, os.strerror(error.errno)))
 
3139
        if error.errno != errno.EPERM:
 
3140
            raise
 
3141
 
 
3142
    if debug:
 
3143
        # Enable all possible GnuTLS debugging
 
3144
 
 
3145
        # "Use a log level over 10 to enable all debugging options."
 
3146
        # - GnuTLS manual
 
3147
        gnutls.global_set_log_level(11)
 
3148
 
 
3149
        @gnutls.log_func
 
3150
        def debug_gnutls(level, string):
 
3151
            logger.debug("GnuTLS: %s", string[:-1])
 
3152
 
 
3153
        gnutls.global_set_log_function(debug_gnutls)
 
3154
 
 
3155
        # Redirect stdin so all checkers get /dev/null
 
3156
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
 
3157
        os.dup2(null, sys.stdin.fileno())
 
3158
        if null > 2:
 
3159
            os.close(null)
 
3160
 
 
3161
    # Need to fork before connecting to D-Bus
 
3162
    if not foreground:
 
3163
        # Close all input and output, do double fork, etc.
 
3164
        daemon()
 
3165
 
 
3166
    # multiprocessing will use threads, so before we use GLib we need
 
3167
    # to inform GLib that threads will be used.
 
3168
    GLib.threads_init()
 
3169
 
811
3170
    global main_loop
812
 
    global bus
813
 
    global server
814
3171
    # From the Avahi example code
815
 
    DBusGMainLoop(set_as_default=True )
816
 
    main_loop = gobject.MainLoop()
 
3172
    DBusGMainLoop(set_as_default=True)
 
3173
    main_loop = GLib.MainLoop()
817
3174
    bus = dbus.SystemBus()
818
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
819
 
                                           avahi.DBUS_PATH_SERVER),
820
 
                            avahi.DBUS_INTERFACE_SERVER)
821
3175
    # End of Avahi example code
822
 
    
823
 
    def remove_from_clients(client):
824
 
        clients.remove(client)
825
 
        if not clients:
826
 
            logger.critical(u"No clients left, exiting")
827
 
            sys.exit()
828
 
    
829
 
    clients.update(Set(Client(name = section,
830
 
                              stop_hook = remove_from_clients,
831
 
                              config
832
 
                              = dict(client_config.items(section)))
833
 
                       for section in client_config.sections()))
834
 
    if not clients:
835
 
        logger.critical(u"No clients defined")
836
 
        sys.exit(1)
837
 
    
838
 
    if debug:
839
 
        # Redirect stdin so all checkers get /dev/null
840
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
841
 
        os.dup2(null, sys.stdin.fileno())
842
 
        if null > 2:
843
 
            os.close(null)
844
 
    else:
845
 
        # No console logging
846
 
        logger.removeHandler(console)
847
 
        # Close all input and output, do double fork, etc.
848
 
        daemon()
849
 
    
850
 
    try:
851
 
        pid = os.getpid()
852
 
        pidfile.write(str(pid) + "\n")
853
 
        pidfile.close()
 
3176
    if use_dbus:
 
3177
        try:
 
3178
            bus_name = dbus.service.BusName("se.recompile.Mandos",
 
3179
                                            bus,
 
3180
                                            do_not_queue=True)
 
3181
            old_bus_name = dbus.service.BusName(
 
3182
                "se.bsnet.fukt.Mandos", bus,
 
3183
                do_not_queue=True)
 
3184
        except dbus.exceptions.DBusException as e:
 
3185
            logger.error("Disabling D-Bus:", exc_info=e)
 
3186
            use_dbus = False
 
3187
            server_settings["use_dbus"] = False
 
3188
            tcp_server.use_dbus = False
 
3189
    if zeroconf:
 
3190
        protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
3191
        service = AvahiServiceToSyslog(
 
3192
            name=server_settings["servicename"],
 
3193
            servicetype="_mandos._tcp",
 
3194
            protocol=protocol,
 
3195
            bus=bus)
 
3196
        if server_settings["interface"]:
 
3197
            service.interface = if_nametoindex(
 
3198
                server_settings["interface"].encode("utf-8"))
 
3199
 
 
3200
    global multiprocessing_manager
 
3201
    multiprocessing_manager = multiprocessing.Manager()
 
3202
 
 
3203
    client_class = Client
 
3204
    if use_dbus:
 
3205
        client_class = functools.partial(ClientDBus, bus=bus)
 
3206
 
 
3207
    client_settings = Client.config_parser(client_config)
 
3208
    old_client_settings = {}
 
3209
    clients_data = {}
 
3210
 
 
3211
    # This is used to redirect stdout and stderr for checker processes
 
3212
    global wnull
 
3213
    wnull = open(os.devnull, "w")  # A writable /dev/null
 
3214
    # Only used if server is running in foreground but not in debug
 
3215
    # mode
 
3216
    if debug or not foreground:
 
3217
        wnull.close()
 
3218
 
 
3219
    # Get client data and settings from last running state.
 
3220
    if server_settings["restore"]:
 
3221
        try:
 
3222
            with open(stored_state_path, "rb") as stored_state:
 
3223
                if sys.version_info.major == 2:
 
3224
                    clients_data, old_client_settings = pickle.load(
 
3225
                        stored_state)
 
3226
                else:
 
3227
                    bytes_clients_data, bytes_old_client_settings = (
 
3228
                        pickle.load(stored_state, encoding="bytes"))
 
3229
                    #   Fix bytes to strings
 
3230
                    #  clients_data
 
3231
                    # .keys()
 
3232
                    clients_data = {(key.decode("utf-8")
 
3233
                                     if isinstance(key, bytes)
 
3234
                                     else key): value
 
3235
                                    for key, value in
 
3236
                                    bytes_clients_data.items()}
 
3237
                    del bytes_clients_data
 
3238
                    for key in clients_data:
 
3239
                        value = {(k.decode("utf-8")
 
3240
                                  if isinstance(k, bytes) else k): v
 
3241
                                 for k, v in
 
3242
                                 clients_data[key].items()}
 
3243
                        clients_data[key] = value
 
3244
                        # .client_structure
 
3245
                        value["client_structure"] = [
 
3246
                            (s.decode("utf-8")
 
3247
                             if isinstance(s, bytes)
 
3248
                             else s) for s in
 
3249
                            value["client_structure"]]
 
3250
                        # .name & .host
 
3251
                        for k in ("name", "host"):
 
3252
                            if isinstance(value[k], bytes):
 
3253
                                value[k] = value[k].decode("utf-8")
 
3254
                        if not value.has_key("key_id"):
 
3255
                            value["key_id"] = ""
 
3256
                        elif not value.has_key("fingerprint"):
 
3257
                            value["fingerprint"] = ""
 
3258
                    #  old_client_settings
 
3259
                    # .keys()
 
3260
                    old_client_settings = {
 
3261
                        (key.decode("utf-8")
 
3262
                         if isinstance(key, bytes)
 
3263
                         else key): value
 
3264
                        for key, value in
 
3265
                        bytes_old_client_settings.items()}
 
3266
                    del bytes_old_client_settings
 
3267
                    # .host
 
3268
                    for value in old_client_settings.values():
 
3269
                        if isinstance(value["host"], bytes):
 
3270
                            value["host"] = (value["host"]
 
3271
                                             .decode("utf-8"))
 
3272
            os.remove(stored_state_path)
 
3273
        except IOError as e:
 
3274
            if e.errno == errno.ENOENT:
 
3275
                logger.warning("Could not load persistent state:"
 
3276
                               " {}".format(os.strerror(e.errno)))
 
3277
            else:
 
3278
                logger.critical("Could not load persistent state:",
 
3279
                                exc_info=e)
 
3280
                raise
 
3281
        except EOFError as e:
 
3282
            logger.warning("Could not load persistent state: "
 
3283
                           "EOFError:",
 
3284
                           exc_info=e)
 
3285
 
 
3286
    with PGPEngine() as pgp:
 
3287
        for client_name, client in clients_data.items():
 
3288
            # Skip removed clients
 
3289
            if client_name not in client_settings:
 
3290
                continue
 
3291
 
 
3292
            # Decide which value to use after restoring saved state.
 
3293
            # We have three different values: Old config file,
 
3294
            # new config file, and saved state.
 
3295
            # New config value takes precedence if it differs from old
 
3296
            # config value, otherwise use saved state.
 
3297
            for name, value in client_settings[client_name].items():
 
3298
                try:
 
3299
                    # For each value in new config, check if it
 
3300
                    # differs from the old config value (Except for
 
3301
                    # the "secret" attribute)
 
3302
                    if (name != "secret"
 
3303
                        and (value !=
 
3304
                             old_client_settings[client_name][name])):
 
3305
                        client[name] = value
 
3306
                except KeyError:
 
3307
                    pass
 
3308
 
 
3309
            # Clients who has passed its expire date can still be
 
3310
            # enabled if its last checker was successful.  A Client
 
3311
            # whose checker succeeded before we stored its state is
 
3312
            # assumed to have successfully run all checkers during
 
3313
            # downtime.
 
3314
            if client["enabled"]:
 
3315
                if datetime.datetime.utcnow() >= client["expires"]:
 
3316
                    if not client["last_checked_ok"]:
 
3317
                        logger.warning(
 
3318
                            "disabling client {} - Client never "
 
3319
                            "performed a successful checker".format(
 
3320
                                client_name))
 
3321
                        client["enabled"] = False
 
3322
                    elif client["last_checker_status"] != 0:
 
3323
                        logger.warning(
 
3324
                            "disabling client {} - Client last"
 
3325
                            " checker failed with error code"
 
3326
                            " {}".format(
 
3327
                                client_name,
 
3328
                                client["last_checker_status"]))
 
3329
                        client["enabled"] = False
 
3330
                    else:
 
3331
                        client["expires"] = (
 
3332
                            datetime.datetime.utcnow()
 
3333
                            + client["timeout"])
 
3334
                        logger.debug("Last checker succeeded,"
 
3335
                                     " keeping {} enabled".format(
 
3336
                                         client_name))
 
3337
            try:
 
3338
                client["secret"] = pgp.decrypt(
 
3339
                    client["encrypted_secret"],
 
3340
                    client_settings[client_name]["secret"])
 
3341
            except PGPError:
 
3342
                # If decryption fails, we use secret from new settings
 
3343
                logger.debug("Failed to decrypt {} old secret".format(
 
3344
                    client_name))
 
3345
                client["secret"] = (client_settings[client_name]
 
3346
                                    ["secret"])
 
3347
 
 
3348
    # Add/remove clients based on new changes made to config
 
3349
    for client_name in (set(old_client_settings)
 
3350
                        - set(client_settings)):
 
3351
        del clients_data[client_name]
 
3352
    for client_name in (set(client_settings)
 
3353
                        - set(old_client_settings)):
 
3354
        clients_data[client_name] = client_settings[client_name]
 
3355
 
 
3356
    # Create all client objects
 
3357
    for client_name, client in clients_data.items():
 
3358
        tcp_server.clients[client_name] = client_class(
 
3359
            name=client_name,
 
3360
            settings=client,
 
3361
            server_settings=server_settings)
 
3362
 
 
3363
    if not tcp_server.clients:
 
3364
        logger.warning("No clients defined")
 
3365
 
 
3366
    if not foreground:
 
3367
        if pidfile is not None:
 
3368
            pid = os.getpid()
 
3369
            try:
 
3370
                with pidfile:
 
3371
                    print(pid, file=pidfile)
 
3372
            except IOError:
 
3373
                logger.error("Could not write to file %r with PID %d",
 
3374
                             pidfilename, pid)
854
3375
        del pidfile
855
 
    except IOError, err:
856
 
        logger.error(u"Could not write to file %r with PID %d",
857
 
                     pidfilename, pid)
858
 
    except NameError:
859
 
        # "pidfile" was never created
860
 
        pass
861
 
    del pidfilename
862
 
    
 
3376
        del pidfilename
 
3377
 
 
3378
    for termsig in (signal.SIGHUP, signal.SIGTERM):
 
3379
        GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,
 
3380
                             lambda: main_loop.quit() and False)
 
3381
 
 
3382
    if use_dbus:
 
3383
 
 
3384
        @alternate_dbus_interfaces(
 
3385
            {"se.recompile.Mandos": "se.bsnet.fukt.Mandos"})
 
3386
        class MandosDBusService(DBusObjectWithObjectManager):
 
3387
            """A D-Bus proxy object"""
 
3388
 
 
3389
            def __init__(self):
 
3390
                dbus.service.Object.__init__(self, bus, "/")
 
3391
 
 
3392
            _interface = "se.recompile.Mandos"
 
3393
 
 
3394
            @dbus.service.signal(_interface, signature="o")
 
3395
            def ClientAdded(self, objpath):
 
3396
                "D-Bus signal"
 
3397
                pass
 
3398
 
 
3399
            @dbus.service.signal(_interface, signature="ss")
 
3400
            def ClientNotFound(self, key_id, address):
 
3401
                "D-Bus signal"
 
3402
                pass
 
3403
 
 
3404
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
 
3405
                               "true"})
 
3406
            @dbus.service.signal(_interface, signature="os")
 
3407
            def ClientRemoved(self, objpath, name):
 
3408
                "D-Bus signal"
 
3409
                pass
 
3410
 
 
3411
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
 
3412
                               "true"})
 
3413
            @dbus.service.method(_interface, out_signature="ao")
 
3414
            def GetAllClients(self):
 
3415
                "D-Bus method"
 
3416
                return dbus.Array(c.dbus_object_path for c in
 
3417
                                  tcp_server.clients.values())
 
3418
 
 
3419
            @dbus_annotations({"org.freedesktop.DBus.Deprecated":
 
3420
                               "true"})
 
3421
            @dbus.service.method(_interface,
 
3422
                                 out_signature="a{oa{sv}}")
 
3423
            def GetAllClientsWithProperties(self):
 
3424
                "D-Bus method"
 
3425
                return dbus.Dictionary(
 
3426
                    {c.dbus_object_path: c.GetAll(
 
3427
                        "se.recompile.Mandos.Client")
 
3428
                     for c in tcp_server.clients.values()},
 
3429
                    signature="oa{sv}")
 
3430
 
 
3431
            @dbus.service.method(_interface, in_signature="o")
 
3432
            def RemoveClient(self, object_path):
 
3433
                "D-Bus method"
 
3434
                for c in tcp_server.clients.values():
 
3435
                    if c.dbus_object_path == object_path:
 
3436
                        del tcp_server.clients[c.name]
 
3437
                        c.remove_from_connection()
 
3438
                        # Don't signal the disabling
 
3439
                        c.disable(quiet=True)
 
3440
                        # Emit D-Bus signal for removal
 
3441
                        self.client_removed_signal(c)
 
3442
                        return
 
3443
                raise KeyError(object_path)
 
3444
 
 
3445
            del _interface
 
3446
 
 
3447
            @dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
 
3448
                                 out_signature="a{oa{sa{sv}}}")
 
3449
            def GetManagedObjects(self):
 
3450
                """D-Bus method"""
 
3451
                return dbus.Dictionary(
 
3452
                    {client.dbus_object_path:
 
3453
                     dbus.Dictionary(
 
3454
                         {interface: client.GetAll(interface)
 
3455
                          for interface in
 
3456
                          client._get_all_interface_names()})
 
3457
                     for client in tcp_server.clients.values()})
 
3458
 
 
3459
            def client_added_signal(self, client):
 
3460
                """Send the new standard signal and the old signal"""
 
3461
                if use_dbus:
 
3462
                    # New standard signal
 
3463
                    self.InterfacesAdded(
 
3464
                        client.dbus_object_path,
 
3465
                        dbus.Dictionary(
 
3466
                            {interface: client.GetAll(interface)
 
3467
                             for interface in
 
3468
                             client._get_all_interface_names()}))
 
3469
                    # Old signal
 
3470
                    self.ClientAdded(client.dbus_object_path)
 
3471
 
 
3472
            def client_removed_signal(self, client):
 
3473
                """Send the new standard signal and the old signal"""
 
3474
                if use_dbus:
 
3475
                    # New standard signal
 
3476
                    self.InterfacesRemoved(
 
3477
                        client.dbus_object_path,
 
3478
                        client._get_all_interface_names())
 
3479
                    # Old signal
 
3480
                    self.ClientRemoved(client.dbus_object_path,
 
3481
                                       client.name)
 
3482
 
 
3483
        mandos_dbus_service = MandosDBusService()
 
3484
 
 
3485
    # Save modules to variables to exempt the modules from being
 
3486
    # unloaded before the function registered with atexit() is run.
 
3487
    mp = multiprocessing
 
3488
    wn = wnull
 
3489
 
863
3490
    def cleanup():
864
3491
        "Cleanup function; run on exit"
865
 
        global group
866
 
        # From the Avahi example code
867
 
        if not group is None:
868
 
            group.Free()
869
 
            group = None
870
 
        # End of Avahi example code
871
 
        
872
 
        while clients:
873
 
            client = clients.pop()
874
 
            client.stop_hook = None
875
 
            client.stop()
876
 
    
 
3492
        if zeroconf:
 
3493
            service.cleanup()
 
3494
 
 
3495
        mp.active_children()
 
3496
        wn.close()
 
3497
        if not (tcp_server.clients or client_settings):
 
3498
            return
 
3499
 
 
3500
        # Store client before exiting. Secrets are encrypted with key
 
3501
        # based on what config file has. If config file is
 
3502
        # removed/edited, old secret will thus be unrecovable.
 
3503
        clients = {}
 
3504
        with PGPEngine() as pgp:
 
3505
            for client in tcp_server.clients.values():
 
3506
                key = client_settings[client.name]["secret"]
 
3507
                client.encrypted_secret = pgp.encrypt(client.secret,
 
3508
                                                      key)
 
3509
                client_dict = {}
 
3510
 
 
3511
                # A list of attributes that can not be pickled
 
3512
                # + secret.
 
3513
                exclude = {"bus", "changedstate", "secret",
 
3514
                           "checker", "server_settings"}
 
3515
                for name, typ in inspect.getmembers(dbus.service
 
3516
                                                    .Object):
 
3517
                    exclude.add(name)
 
3518
 
 
3519
                client_dict["encrypted_secret"] = (client
 
3520
                                                   .encrypted_secret)
 
3521
                for attr in client.client_structure:
 
3522
                    if attr not in exclude:
 
3523
                        client_dict[attr] = getattr(client, attr)
 
3524
 
 
3525
                clients[client.name] = client_dict
 
3526
                del client_settings[client.name]["secret"]
 
3527
 
 
3528
        try:
 
3529
            with tempfile.NamedTemporaryFile(
 
3530
                    mode='wb',
 
3531
                    suffix=".pickle",
 
3532
                    prefix='clients-',
 
3533
                    dir=os.path.dirname(stored_state_path),
 
3534
                    delete=False) as stored_state:
 
3535
                pickle.dump((clients, client_settings), stored_state,
 
3536
                            protocol=2)
 
3537
                tempname = stored_state.name
 
3538
            os.rename(tempname, stored_state_path)
 
3539
        except (IOError, OSError) as e:
 
3540
            if not debug:
 
3541
                try:
 
3542
                    os.remove(tempname)
 
3543
                except NameError:
 
3544
                    pass
 
3545
            if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
 
3546
                logger.warning("Could not save persistent state: {}"
 
3547
                               .format(os.strerror(e.errno)))
 
3548
            else:
 
3549
                logger.warning("Could not save persistent state:",
 
3550
                               exc_info=e)
 
3551
                raise
 
3552
 
 
3553
        # Delete all clients, and settings from config
 
3554
        while tcp_server.clients:
 
3555
            name, client = tcp_server.clients.popitem()
 
3556
            if use_dbus:
 
3557
                client.remove_from_connection()
 
3558
            # Don't signal the disabling
 
3559
            client.disable(quiet=True)
 
3560
            # Emit D-Bus signal for removal
 
3561
            if use_dbus:
 
3562
                mandos_dbus_service.client_removed_signal(client)
 
3563
        client_settings.clear()
 
3564
 
877
3565
    atexit.register(cleanup)
878
 
    
879
 
    if not debug:
880
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
881
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
882
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
883
 
    
884
 
    for client in clients:
885
 
        client.start()
886
 
    
 
3566
 
 
3567
    for client in tcp_server.clients.values():
 
3568
        if use_dbus:
 
3569
            # Emit D-Bus signal for adding
 
3570
            mandos_dbus_service.client_added_signal(client)
 
3571
        # Need to initiate checking of clients
 
3572
        if client.enabled:
 
3573
            client.init_checker()
 
3574
 
887
3575
    tcp_server.enable()
888
3576
    tcp_server.server_activate()
889
 
    
 
3577
 
890
3578
    # Find out what port we got
891
 
    service.port = tcp_server.socket.getsockname()[1]
892
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
893
 
                u" scope_id %d" % tcp_server.socket.getsockname())
894
 
    
895
 
    #service.interface = tcp_server.socket.getsockname()[3]
896
 
    
 
3579
    if zeroconf:
 
3580
        service.port = tcp_server.socket.getsockname()[1]
 
3581
    if use_ipv6:
 
3582
        logger.info("Now listening on address %r, port %d,"
 
3583
                    " flowinfo %d, scope_id %d",
 
3584
                    *tcp_server.socket.getsockname())
 
3585
    else:                       # IPv4
 
3586
        logger.info("Now listening on address %r, port %d",
 
3587
                    *tcp_server.socket.getsockname())
 
3588
 
 
3589
    # service.interface = tcp_server.socket.getsockname()[3]
 
3590
 
897
3591
    try:
898
 
        # From the Avahi example code
899
 
        server.connect_to_signal("StateChanged", server_state_changed)
900
 
        try:
901
 
            server_state_changed(server.GetState())
902
 
        except dbus.exceptions.DBusException, error:
903
 
            logger.critical(u"DBusException: %s", error)
904
 
            sys.exit(1)
905
 
        # End of Avahi example code
906
 
        
907
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
908
 
                             lambda *args, **kwargs:
909
 
                             tcp_server.handle_request\
910
 
                             (*args[2:], **kwargs) or True)
911
 
        
912
 
        logger.debug(u"Starting main loop")
913
 
        main_loop_started = True
 
3592
        if zeroconf:
 
3593
            # From the Avahi example code
 
3594
            try:
 
3595
                service.activate()
 
3596
            except dbus.exceptions.DBusException as error:
 
3597
                logger.critical("D-Bus Exception", exc_info=error)
 
3598
                cleanup()
 
3599
                sys.exit(1)
 
3600
            # End of Avahi example code
 
3601
 
 
3602
        GLib.io_add_watch(tcp_server.fileno(), GLib.IO_IN,
 
3603
                          lambda *args, **kwargs:
 
3604
                          (tcp_server.handle_request
 
3605
                           (*args[2:], **kwargs) or True))
 
3606
 
 
3607
        logger.debug("Starting main loop")
914
3608
        main_loop.run()
915
 
    except AvahiError, error:
916
 
        logger.critical(u"AvahiError: %s" + unicode(error))
 
3609
    except AvahiError as error:
 
3610
        logger.critical("Avahi Error", exc_info=error)
 
3611
        cleanup()
917
3612
        sys.exit(1)
918
3613
    except KeyboardInterrupt:
919
3614
        if debug:
920
 
            print
 
3615
            print("", file=sys.stderr)
 
3616
        logger.debug("Server received KeyboardInterrupt")
 
3617
    logger.debug("Server exiting")
 
3618
    # Must run before the D-Bus bus name gets deregistered
 
3619
    cleanup()
 
3620
 
921
3621
 
922
3622
if __name__ == '__main__':
923
3623
    main()