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  • Committer: Teddy Hogeborn
  • Date: 2008-07-20 06:33:48 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080720063348-jscgy5p0itrgvlo8
* mandos-clients.conf ([foo]): Uncommented.
  ([foo]/secret): New.
  ([foo]/secfile): Commented out.
  ([foo]/checker): Changed to "fping -q -- %%(fqdn)s".
  ([foo]/timeout): New.

* server.py: New modeline for Python and Emacs.  Set a logging format.
  (Client.__init__): Bug fix: Choose either the value from the options
                     object or pass the argument through string_to_delta
                     for both "timeout" and "interval".
  (Client.checker_callback): Bug fix: Do not log spurious "Checker for
                             <foo> failed" messages.
  (Client.start_checker): Moved "Starting checker" log message down to
                          just before actually starting the subprocess.
                          Do not redirect the subprocesses' stdout to a
                          pipe.
  (peer_certificate, fingerprint): Added docstrings.
  (entry_group_state_changed): Call "killme()" instead of
                               "main_loop.quit()".
  (daemon, killme): New functions.
  (exitstatus, main_loop_started): New global variables.
  (__main__): Removed the "--cert", "--key", "--ca", and "--crl"
              options.  Removed the sleep command from the default
              checker.  Add a console logger in debug mode.  Call
              "killme()" instead of "main_loop.quit()" when there are no
              more clients.  Call "daemon()" if not in debug mode.
              Register "cleanup()" to run at exit.  Ignore some
              signals.  Catch DBusException to detect another running
              server and exit cleanly.  Exit with "exitstatus".
  (cleanup): New function.

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#!/usr/bin/python
2
2
# -*- mode: python; coding: utf-8 -*-
3
 
4
 
# Mandos server - give out binary blobs to connecting clients.
5
 
6
 
# This program is partly derived from an example program for an Avahi
7
 
# service publisher, downloaded from
8
 
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add", "remove", "server_state_changed",
10
 
# "entry_group_state_changed", "cleanup", and "activate" in the
11
 
# "AvahiService" class, and some lines in "main".
12
 
13
 
# Everything else is
14
 
# Copyright © 2008-2011 Teddy Hogeborn
15
 
# Copyright © 2008-2011 Björn Påhlsson
16
 
17
 
# This program is free software: you can redistribute it and/or modify
18
 
# it under the terms of the GNU General Public License as published by
19
 
# the Free Software Foundation, either version 3 of the License, or
20
 
# (at your option) any later version.
21
 
#
22
 
#     This program is distributed in the hope that it will be useful,
23
 
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
24
 
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25
 
#     GNU General Public License for more details.
26
 
27
 
# You should have received a copy of the GNU General Public License
28
 
# along with this program.  If not, see
29
 
# <http://www.gnu.org/licenses/>.
30
 
31
 
# Contact the authors at <mandos@recompile.se>.
32
 
33
 
 
34
 
from __future__ import (division, absolute_import, print_function,
35
 
                        unicode_literals)
36
 
 
37
 
import SocketServer as socketserver
 
3
 
 
4
from __future__ import division
 
5
 
 
6
import SocketServer
38
7
import socket
39
 
import argparse
 
8
import select
 
9
from optparse import OptionParser
40
10
import datetime
41
11
import errno
42
12
import gnutls.crypto
45
15
import gnutls.library.functions
46
16
import gnutls.library.constants
47
17
import gnutls.library.types
48
 
import ConfigParser as configparser
 
18
import ConfigParser
49
19
import sys
50
20
import re
51
21
import os
52
22
import signal
 
23
from sets import Set
53
24
import subprocess
54
25
import atexit
55
26
import stat
56
 
import logging
57
 
import logging.handlers
58
 
import pwd
59
 
import contextlib
60
 
import struct
61
 
import fcntl
62
 
import functools
63
 
import cPickle as pickle
64
 
import multiprocessing
65
 
import types
66
 
import binascii
67
 
import tempfile
68
27
 
69
28
import dbus
70
 
import dbus.service
71
29
import gobject
72
30
import avahi
73
31
from dbus.mainloop.glib import DBusGMainLoop
74
32
import ctypes
75
 
import ctypes.util
76
 
import xml.dom.minidom
77
 
import inspect
78
 
import GnuPGInterface
79
 
 
80
 
try:
81
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
82
 
except AttributeError:
83
 
    try:
84
 
        from IN import SO_BINDTODEVICE
85
 
    except ImportError:
86
 
        SO_BINDTODEVICE = None
87
 
 
88
 
 
89
 
version = "1.4.1"
90
 
stored_state_file = "clients.pickle"
91
 
 
92
 
logger = logging.getLogger()
93
 
syslogger = (logging.handlers.SysLogHandler
94
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
95
 
              address = str("/dev/log")))
96
 
 
97
 
try:
98
 
    if_nametoindex = (ctypes.cdll.LoadLibrary
99
 
                      (ctypes.util.find_library("c"))
100
 
                      .if_nametoindex)
101
 
except (OSError, AttributeError):
102
 
    def if_nametoindex(interface):
103
 
        "Get an interface index the hard way, i.e. using fcntl()"
104
 
        SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
105
 
        with contextlib.closing(socket.socket()) as s:
106
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
107
 
                                struct.pack(str("16s16x"),
108
 
                                            interface))
109
 
        interface_index = struct.unpack(str("I"),
110
 
                                        ifreq[16:20])[0]
111
 
        return interface_index
112
 
 
113
 
 
114
 
def initlogger(level=logging.WARNING):
115
 
    """init logger and add loglevel"""
116
 
    
117
 
    syslogger.setFormatter(logging.Formatter
118
 
                           ('Mandos [%(process)d]: %(levelname)s:'
119
 
                            ' %(message)s'))
120
 
    logger.addHandler(syslogger)
121
 
    
122
 
    console = logging.StreamHandler()
123
 
    console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
124
 
                                           ' [%(process)d]:'
125
 
                                           ' %(levelname)s:'
126
 
                                           ' %(message)s'))
127
 
    logger.addHandler(console)
128
 
    logger.setLevel(level)
129
 
 
130
 
 
131
 
class PGPError(Exception):
132
 
    """Exception if encryption/decryption fails"""
133
 
    pass
134
 
 
135
 
 
136
 
class PGPEngine(object):
137
 
    """A simple class for OpenPGP symmetric encryption & decryption"""
138
 
    def __init__(self):
139
 
        self.gnupg = GnuPGInterface.GnuPG()
140
 
        self.tempdir = tempfile.mkdtemp(prefix="mandos-")
141
 
        self.gnupg = GnuPGInterface.GnuPG()
142
 
        self.gnupg.options.meta_interactive = False
143
 
        self.gnupg.options.homedir = self.tempdir
144
 
        self.gnupg.options.extra_args.extend(['--force-mdc',
145
 
                                              '--quiet'])
146
 
    
147
 
    def __enter__(self):
148
 
        return self
149
 
    
150
 
    def __exit__ (self, exc_type, exc_value, traceback):
151
 
        self._cleanup()
152
 
        return False
153
 
    
154
 
    def __del__(self):
155
 
        self._cleanup()
156
 
    
157
 
    def _cleanup(self):
158
 
        if self.tempdir is not None:
159
 
            # Delete contents of tempdir
160
 
            for root, dirs, files in os.walk(self.tempdir,
161
 
                                             topdown = False):
162
 
                for filename in files:
163
 
                    os.remove(os.path.join(root, filename))
164
 
                for dirname in dirs:
165
 
                    os.rmdir(os.path.join(root, dirname))
166
 
            # Remove tempdir
167
 
            os.rmdir(self.tempdir)
168
 
            self.tempdir = None
169
 
    
170
 
    def password_encode(self, password):
171
 
        # Passphrase can not be empty and can not contain newlines or
172
 
        # NUL bytes.  So we prefix it and hex encode it.
173
 
        return b"mandos" + binascii.hexlify(password)
174
 
    
175
 
    def encrypt(self, data, password):
176
 
        self.gnupg.passphrase = self.password_encode(password)
177
 
        with open(os.devnull) as devnull:
178
 
            try:
179
 
                proc = self.gnupg.run(['--symmetric'],
180
 
                                      create_fhs=['stdin', 'stdout'],
181
 
                                      attach_fhs={'stderr': devnull})
182
 
                with contextlib.closing(proc.handles['stdin']) as f:
183
 
                    f.write(data)
184
 
                with contextlib.closing(proc.handles['stdout']) as f:
185
 
                    ciphertext = f.read()
186
 
                proc.wait()
187
 
            except IOError as e:
188
 
                raise PGPError(e)
189
 
        self.gnupg.passphrase = None
190
 
        return ciphertext
191
 
    
192
 
    def decrypt(self, data, password):
193
 
        self.gnupg.passphrase = self.password_encode(password)
194
 
        with open(os.devnull) as devnull:
195
 
            try:
196
 
                proc = self.gnupg.run(['--decrypt'],
197
 
                                      create_fhs=['stdin', 'stdout'],
198
 
                                      attach_fhs={'stderr': devnull})
199
 
                with contextlib.closing(proc.handles['stdin'] ) as f:
200
 
                    f.write(data)
201
 
                with contextlib.closing(proc.handles['stdout']) as f:
202
 
                    decrypted_plaintext = f.read()
203
 
                proc.wait()
204
 
            except IOError as e:
205
 
                raise PGPError(e)
206
 
        self.gnupg.passphrase = None
207
 
        return decrypted_plaintext
208
 
 
209
 
 
210
 
 
211
 
class AvahiError(Exception):
212
 
    def __init__(self, value, *args, **kwargs):
213
 
        self.value = value
214
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
215
 
    def __unicode__(self):
216
 
        return unicode(repr(self.value))
217
 
 
218
 
class AvahiServiceError(AvahiError):
219
 
    pass
220
 
 
221
 
class AvahiGroupError(AvahiError):
222
 
    pass
223
 
 
224
 
 
225
 
class AvahiService(object):
226
 
    """An Avahi (Zeroconf) service.
227
 
    
228
 
    Attributes:
229
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
230
 
               Used to optionally bind to the specified interface.
231
 
    name: string; Example: 'Mandos'
232
 
    type: string; Example: '_mandos._tcp'.
233
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
234
 
    port: integer; what port to announce
235
 
    TXT: list of strings; TXT record for the service
236
 
    domain: string; Domain to publish on, default to .local if empty.
237
 
    host: string; Host to publish records for, default is localhost
238
 
    max_renames: integer; maximum number of renames
239
 
    rename_count: integer; counter so we only rename after collisions
240
 
                  a sensible number of times
241
 
    group: D-Bus Entry Group
242
 
    server: D-Bus Server
243
 
    bus: dbus.SystemBus()
244
 
    """
245
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
246
 
                 servicetype = None, port = None, TXT = None,
247
 
                 domain = "", host = "", max_renames = 32768,
248
 
                 protocol = avahi.PROTO_UNSPEC, bus = None):
249
 
        self.interface = interface
250
 
        self.name = name
251
 
        self.type = servicetype
252
 
        self.port = port
253
 
        self.TXT = TXT if TXT is not None else []
254
 
        self.domain = domain
255
 
        self.host = host
256
 
        self.rename_count = 0
257
 
        self.max_renames = max_renames
258
 
        self.protocol = protocol
259
 
        self.group = None       # our entry group
260
 
        self.server = None
261
 
        self.bus = bus
262
 
        self.entry_group_state_changed_match = None
263
 
    def rename(self):
264
 
        """Derived from the Avahi example code"""
265
 
        if self.rename_count >= self.max_renames:
266
 
            logger.critical("No suitable Zeroconf service name found"
267
 
                            " after %i retries, exiting.",
268
 
                            self.rename_count)
269
 
            raise AvahiServiceError("Too many renames")
270
 
        self.name = unicode(self.server
271
 
                            .GetAlternativeServiceName(self.name))
272
 
        logger.info("Changing Zeroconf service name to %r ...",
273
 
                    self.name)
274
 
        self.remove()
275
 
        try:
276
 
            self.add()
277
 
        except dbus.exceptions.DBusException as error:
278
 
            logger.critical("DBusException: %s", error)
279
 
            self.cleanup()
280
 
            os._exit(1)
281
 
        self.rename_count += 1
282
 
    def remove(self):
283
 
        """Derived from the Avahi example code"""
284
 
        if self.entry_group_state_changed_match is not None:
285
 
            self.entry_group_state_changed_match.remove()
286
 
            self.entry_group_state_changed_match = None
287
 
        if self.group is not None:
288
 
            self.group.Reset()
289
 
    def add(self):
290
 
        """Derived from the Avahi example code"""
291
 
        self.remove()
292
 
        if self.group is None:
293
 
            self.group = dbus.Interface(
294
 
                self.bus.get_object(avahi.DBUS_NAME,
295
 
                                    self.server.EntryGroupNew()),
296
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
297
 
        self.entry_group_state_changed_match = (
298
 
            self.group.connect_to_signal(
299
 
                'StateChanged', self.entry_group_state_changed))
300
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
301
 
                     self.name, self.type)
302
 
        self.group.AddService(
303
 
            self.interface,
304
 
            self.protocol,
305
 
            dbus.UInt32(0),     # flags
306
 
            self.name, self.type,
307
 
            self.domain, self.host,
308
 
            dbus.UInt16(self.port),
309
 
            avahi.string_array_to_txt_array(self.TXT))
310
 
        self.group.Commit()
311
 
    def entry_group_state_changed(self, state, error):
312
 
        """Derived from the Avahi example code"""
313
 
        logger.debug("Avahi entry group state change: %i", state)
314
 
        
315
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
316
 
            logger.debug("Zeroconf service established.")
317
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
318
 
            logger.info("Zeroconf service name collision.")
319
 
            self.rename()
320
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
321
 
            logger.critical("Avahi: Error in group state changed %s",
322
 
                            unicode(error))
323
 
            raise AvahiGroupError("State changed: %s"
324
 
                                  % unicode(error))
325
 
    def cleanup(self):
326
 
        """Derived from the Avahi example code"""
327
 
        if self.group is not None:
328
 
            try:
329
 
                self.group.Free()
330
 
            except (dbus.exceptions.UnknownMethodException,
331
 
                    dbus.exceptions.DBusException):
332
 
                pass
333
 
            self.group = None
334
 
        self.remove()
335
 
    def server_state_changed(self, state, error=None):
336
 
        """Derived from the Avahi example code"""
337
 
        logger.debug("Avahi server state change: %i", state)
338
 
        bad_states = { avahi.SERVER_INVALID:
339
 
                           "Zeroconf server invalid",
340
 
                       avahi.SERVER_REGISTERING: None,
341
 
                       avahi.SERVER_COLLISION:
342
 
                           "Zeroconf server name collision",
343
 
                       avahi.SERVER_FAILURE:
344
 
                           "Zeroconf server failure" }
345
 
        if state in bad_states:
346
 
            if bad_states[state] is not None:
347
 
                if error is None:
348
 
                    logger.error(bad_states[state])
349
 
                else:
350
 
                    logger.error(bad_states[state] + ": %r", error)
351
 
            self.cleanup()
352
 
        elif state == avahi.SERVER_RUNNING:
353
 
            self.add()
354
 
        else:
355
 
            if error is None:
356
 
                logger.debug("Unknown state: %r", state)
357
 
            else:
358
 
                logger.debug("Unknown state: %r: %r", state, error)
359
 
    def activate(self):
360
 
        """Derived from the Avahi example code"""
361
 
        if self.server is None:
362
 
            self.server = dbus.Interface(
363
 
                self.bus.get_object(avahi.DBUS_NAME,
364
 
                                    avahi.DBUS_PATH_SERVER,
365
 
                                    follow_name_owner_changes=True),
366
 
                avahi.DBUS_INTERFACE_SERVER)
367
 
        self.server.connect_to_signal("StateChanged",
368
 
                                 self.server_state_changed)
369
 
        self.server_state_changed(self.server.GetState())
370
 
 
371
 
class AvahiServiceToSyslog(AvahiService):
372
 
    def rename(self):
373
 
        """Add the new name to the syslog messages"""
374
 
        ret = AvahiService.rename(self)
375
 
        syslogger.setFormatter(logging.Formatter
376
 
                               ('Mandos (%s) [%%(process)d]:'
377
 
                                ' %%(levelname)s: %%(message)s'
378
 
                                % self.name))
379
 
        return ret
380
 
 
381
 
def timedelta_to_milliseconds(td):
382
 
    "Convert a datetime.timedelta() to milliseconds"
383
 
    return ((td.days * 24 * 60 * 60 * 1000)
384
 
            + (td.seconds * 1000)
385
 
            + (td.microseconds // 1000))
386
 
        
 
33
 
 
34
import logging
 
35
import logging.handlers
 
36
 
 
37
logger = logging.Logger('mandos')
 
38
syslogger = logging.handlers.SysLogHandler\
 
39
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
 
40
syslogger.setFormatter(logging.Formatter\
 
41
                        ('%(levelname)s: %(message)s'))
 
42
logger.addHandler(syslogger)
 
43
del syslogger
 
44
 
 
45
# This variable is used to optionally bind to a specified interface.
 
46
# It is a global variable to fit in with the other variables from the
 
47
# Avahi server example code.
 
48
serviceInterface = avahi.IF_UNSPEC
 
49
# From the Avahi server example code:
 
50
serviceName = "Mandos"
 
51
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
52
servicePort = None                      # Not known at startup
 
53
serviceTXT = []                         # TXT record for the service
 
54
domain = ""                  # Domain to publish on, default to .local
 
55
host = ""          # Host to publish records for, default to localhost
 
56
group = None #our entry group
 
57
rename_count = 12       # Counter so we only rename after collisions a
 
58
                        # sensible number of times
 
59
# End of Avahi example code
 
60
 
 
61
 
387
62
class Client(object):
388
63
    """A representation of a client host served by this server.
389
 
    
390
64
    Attributes:
391
 
    approved:   bool(); 'None' if not yet approved/disapproved
392
 
    approval_delay: datetime.timedelta(); Time to wait for approval
393
 
    approval_duration: datetime.timedelta(); Duration of one approval
394
 
    checker:    subprocess.Popen(); a running checker process used
395
 
                                    to see if the client lives.
396
 
                                    'None' if no process is running.
397
 
    checker_callback_tag: a gobject event source tag, or None
398
 
    checker_command: string; External command which is run to check
399
 
                     if client lives.  %() expansions are done at
 
65
    name:      string; from the config file, used in log messages
 
66
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
67
                 uniquely identify the client
 
68
    secret:    bytestring; sent verbatim (over TLS) to client
 
69
    fqdn:      string (FQDN); available for use by the checker command
 
70
    created:   datetime.datetime()
 
71
    last_seen: datetime.datetime() or None if not yet seen
 
72
    timeout:   datetime.timedelta(); How long from last_seen until
 
73
                                     this client is invalid
 
74
    interval:  datetime.timedelta(); How often to start a new checker
 
75
    stop_hook: If set, called by stop() as stop_hook(self)
 
76
    checker:   subprocess.Popen(); a running checker process used
 
77
                                   to see if the client lives.
 
78
                                   Is None if no process is running.
 
79
    checker_initiator_tag: a gobject event source tag, or None
 
80
    stop_initiator_tag:    - '' -
 
81
    checker_callback_tag:  - '' -
 
82
    checker_command: string; External command which is run to check if
 
83
                     client lives.  %()s expansions are done at
400
84
                     runtime with vars(self) as dict, so that for
401
85
                     instance %(name)s can be used in the command.
402
 
    checker_initiator_tag: a gobject event source tag, or None
403
 
    created:    datetime.datetime(); (UTC) object creation
404
 
    client_structure: Object describing what attributes a client has
405
 
                      and is used for storing the client at exit
406
 
    current_checker_command: string; current running checker_command
407
 
    disable_initiator_tag: a gobject event source tag, or None
408
 
    enabled:    bool()
409
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
410
 
                 uniquely identify the client
411
 
    host:       string; available for use by the checker command
412
 
    interval:   datetime.timedelta(); How often to start a new checker
413
 
    last_approval_request: datetime.datetime(); (UTC) or None
414
 
    last_checked_ok: datetime.datetime(); (UTC) or None
415
 
 
416
 
    last_checker_status: integer between 0 and 255 reflecting exit
417
 
                         status of last checker. -1 reflects crashed
418
 
                         checker, or None.
419
 
    last_enabled: datetime.datetime(); (UTC) or None
420
 
    name:       string; from the config file, used in log messages and
421
 
                        D-Bus identifiers
422
 
    secret:     bytestring; sent verbatim (over TLS) to client
423
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
424
 
                                      until this client is disabled
425
 
    extended_timeout:   extra long timeout when password has been sent
426
 
    runtime_expansions: Allowed attributes for runtime expansion.
427
 
    expires:    datetime.datetime(); time (UTC) when a client will be
428
 
                disabled, or None
 
86
    Private attibutes:
 
87
    _timeout: Real variable for 'timeout'
 
88
    _interval: Real variable for 'interval'
 
89
    _timeout_milliseconds: Used by gobject.timeout_add()
 
90
    _interval_milliseconds: - '' -
429
91
    """
430
 
    
431
 
    runtime_expansions = ("approval_delay", "approval_duration",
432
 
                          "created", "enabled", "fingerprint",
433
 
                          "host", "interval", "last_checked_ok",
434
 
                          "last_enabled", "name", "timeout")
435
 
    
436
 
    def timeout_milliseconds(self):
437
 
        "Return the 'timeout' attribute in milliseconds"
438
 
        return timedelta_to_milliseconds(self.timeout)
439
 
    
440
 
    def extended_timeout_milliseconds(self):
441
 
        "Return the 'extended_timeout' attribute in milliseconds"
442
 
        return timedelta_to_milliseconds(self.extended_timeout)
443
 
    
444
 
    def interval_milliseconds(self):
445
 
        "Return the 'interval' attribute in milliseconds"
446
 
        return timedelta_to_milliseconds(self.interval)
447
 
    
448
 
    def approval_delay_milliseconds(self):
449
 
        return timedelta_to_milliseconds(self.approval_delay)
450
 
    
451
 
    def __init__(self, name = None, config=None):
452
 
        """Note: the 'checker' key in 'config' sets the
453
 
        'checker_command' attribute and *not* the 'checker'
454
 
        attribute."""
 
92
    def _set_timeout(self, timeout):
 
93
        "Setter function for 'timeout' attribute"
 
94
        self._timeout = timeout
 
95
        self._timeout_milliseconds = ((self.timeout.days
 
96
                                       * 24 * 60 * 60 * 1000)
 
97
                                      + (self.timeout.seconds * 1000)
 
98
                                      + (self.timeout.microseconds
 
99
                                         // 1000))
 
100
    timeout = property(lambda self: self._timeout,
 
101
                       _set_timeout)
 
102
    del _set_timeout
 
103
    def _set_interval(self, interval):
 
104
        "Setter function for 'interval' attribute"
 
105
        self._interval = interval
 
106
        self._interval_milliseconds = ((self.interval.days
 
107
                                        * 24 * 60 * 60 * 1000)
 
108
                                       + (self.interval.seconds
 
109
                                          * 1000)
 
110
                                       + (self.interval.microseconds
 
111
                                          // 1000))
 
112
    interval = property(lambda self: self._interval,
 
113
                        _set_interval)
 
114
    del _set_interval
 
115
    def __init__(self, name=None, options=None, stop_hook=None,
 
116
                 fingerprint=None, secret=None, secfile=None,
 
117
                 fqdn=None, timeout=None, interval=-1, checker=None):
455
118
        self.name = name
456
 
        if config is None:
457
 
            config = {}
458
 
        logger.debug("Creating client %r", self.name)
459
 
        # Uppercase and remove spaces from fingerprint for later
460
 
        # comparison purposes with return value from the fingerprint()
461
 
        # function
462
 
        self.fingerprint = (config["fingerprint"].upper()
463
 
                            .replace(" ", ""))
464
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
465
 
        if "secret" in config:
466
 
            self.secret = config["secret"].decode("base64")
467
 
        elif "secfile" in config:
468
 
            with open(os.path.expanduser(os.path.expandvars
469
 
                                         (config["secfile"])),
470
 
                      "rb") as secfile:
471
 
                self.secret = secfile.read()
472
 
        else:
473
 
            raise TypeError("No secret or secfile for client %s"
474
 
                            % self.name)
475
 
        self.host = config.get("host", "")
476
 
        self.created = datetime.datetime.utcnow()
477
 
        self.enabled = config.get("enabled", True)
478
 
        self.last_approval_request = None
479
 
        if self.enabled:
480
 
            self.last_enabled = datetime.datetime.utcnow()
481
 
        else:
482
 
            self.last_enabled = None
483
 
        self.last_checked_ok = None
484
 
        self.last_checker_status = None
485
 
        self.timeout = string_to_delta(config["timeout"])
486
 
        self.extended_timeout = string_to_delta(config
487
 
                                                ["extended_timeout"])
488
 
        self.interval = string_to_delta(config["interval"])
 
119
        # Uppercase and remove spaces from fingerprint
 
120
        # for later comparison purposes with return value of
 
121
        # the fingerprint() function
 
122
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
123
        if secret:
 
124
            self.secret = secret.decode(u"base64")
 
125
        elif secfile:
 
126
            sf = open(secfile)
 
127
            self.secret = sf.read()
 
128
            sf.close()
 
129
        else:
 
130
            raise RuntimeError(u"No secret or secfile for client %s"
 
131
                               % self.name)
 
132
        self.fqdn = fqdn                # string
 
133
        self.created = datetime.datetime.now()
 
134
        self.last_seen = None
 
135
        if timeout is None:
 
136
            self.timeout = options.timeout
 
137
        else:
 
138
            self.timeout = string_to_delta(timeout)
 
139
        if interval == -1:
 
140
            self.interval = options.interval
 
141
        else:
 
142
            self.interval = string_to_delta(interval)
 
143
        self.stop_hook = stop_hook
489
144
        self.checker = None
490
145
        self.checker_initiator_tag = None
491
 
        self.disable_initiator_tag = None
492
 
        if self.enabled:
493
 
            self.expires = datetime.datetime.utcnow() + self.timeout
494
 
        else:
495
 
            self.expires = None
 
146
        self.stop_initiator_tag = None
496
147
        self.checker_callback_tag = None
497
 
        self.checker_command = config["checker"]
498
 
        self.current_checker_command = None
499
 
        self.approved = None
500
 
        self.approved_by_default = config.get("approved_by_default",
501
 
                                              True)
502
 
        self.approvals_pending = 0
503
 
        self.approval_delay = string_to_delta(
504
 
            config["approval_delay"])
505
 
        self.approval_duration = string_to_delta(
506
 
            config["approval_duration"])
507
 
        self.changedstate = (multiprocessing_manager
508
 
                             .Condition(multiprocessing_manager
509
 
                                        .Lock()))
510
 
        self.client_structure = [attr for attr in
511
 
                                 self.__dict__.iterkeys()
512
 
                                 if not attr.startswith("_")]
513
 
        self.client_structure.append("client_structure")
514
 
        
515
 
        for name, t in inspect.getmembers(type(self),
516
 
                                          lambda obj:
517
 
                                              isinstance(obj,
518
 
                                                         property)):
519
 
            if not name.startswith("_"):
520
 
                self.client_structure.append(name)
521
 
    
522
 
    # Send notice to process children that client state has changed
523
 
    def send_changedstate(self):
524
 
        with self.changedstate:
525
 
            self.changedstate.notify_all()
526
 
    
527
 
    def enable(self):
528
 
        """Start this client's checker and timeout hooks"""
529
 
        if getattr(self, "enabled", False):
530
 
            # Already enabled
531
 
            return
532
 
        self.send_changedstate()
533
 
        self.expires = datetime.datetime.utcnow() + self.timeout
534
 
        self.enabled = True
535
 
        self.last_enabled = datetime.datetime.utcnow()
536
 
        self.init_checker()
537
 
    
538
 
    def disable(self, quiet=True):
539
 
        """Disable this client."""
540
 
        if not getattr(self, "enabled", False):
541
 
            return False
542
 
        if not quiet:
543
 
            self.send_changedstate()
544
 
        if not quiet:
545
 
            logger.info("Disabling client %s", self.name)
546
 
        if getattr(self, "disable_initiator_tag", False):
547
 
            gobject.source_remove(self.disable_initiator_tag)
548
 
            self.disable_initiator_tag = None
549
 
        self.expires = None
550
 
        if getattr(self, "checker_initiator_tag", False):
551
 
            gobject.source_remove(self.checker_initiator_tag)
552
 
            self.checker_initiator_tag = None
553
 
        self.stop_checker()
554
 
        self.enabled = False
555
 
        # Do not run this again if called by a gobject.timeout_add
556
 
        return False
557
 
    
558
 
    def __del__(self):
559
 
        self.disable()
560
 
    
561
 
    def init_checker(self):
 
148
        self.check_command = checker
 
149
    def start(self):
 
150
        """Start this clients checker and timeout hooks"""
562
151
        # Schedule a new checker to be started an 'interval' from now,
563
152
        # and every interval from then on.
564
 
        self.checker_initiator_tag = (gobject.timeout_add
565
 
                                      (self.interval_milliseconds(),
566
 
                                       self.start_checker))
567
 
        # Schedule a disable() when 'timeout' has passed
568
 
        self.disable_initiator_tag = (gobject.timeout_add
569
 
                                   (self.timeout_milliseconds(),
570
 
                                    self.disable))
 
153
        self.checker_initiator_tag = gobject.timeout_add\
 
154
                                     (self._interval_milliseconds,
 
155
                                      self.start_checker)
571
156
        # Also start a new checker *right now*.
572
157
        self.start_checker()
573
 
    
574
 
    def checker_callback(self, pid, condition, command):
 
158
        # Schedule a stop() when 'timeout' has passed
 
159
        self.stop_initiator_tag = gobject.timeout_add\
 
160
                                  (self._timeout_milliseconds,
 
161
                                   self.stop)
 
162
    def stop(self):
 
163
        """Stop this client.
 
164
        The possibility that this client might be restarted is left
 
165
        open, but not currently used."""
 
166
        logger.debug(u"Stopping client %s", self.name)
 
167
        self.secret = None
 
168
        if self.stop_initiator_tag:
 
169
            gobject.source_remove(self.stop_initiator_tag)
 
170
            self.stop_initiator_tag = None
 
171
        if self.checker_initiator_tag:
 
172
            gobject.source_remove(self.checker_initiator_tag)
 
173
            self.checker_initiator_tag = None
 
174
        self.stop_checker()
 
175
        if self.stop_hook:
 
176
            self.stop_hook(self)
 
177
        # Do not run this again if called by a gobject.timeout_add
 
178
        return False
 
179
    def __del__(self):
 
180
        # Some code duplication here and in stop()
 
181
        if hasattr(self, "stop_initiator_tag") \
 
182
               and self.stop_initiator_tag:
 
183
            gobject.source_remove(self.stop_initiator_tag)
 
184
            self.stop_initiator_tag = None
 
185
        if hasattr(self, "checker_initiator_tag") \
 
186
               and self.checker_initiator_tag:
 
187
            gobject.source_remove(self.checker_initiator_tag)
 
188
            self.checker_initiator_tag = None
 
189
        self.stop_checker()
 
190
    def checker_callback(self, pid, condition):
575
191
        """The checker has completed, so take appropriate actions."""
576
 
        self.checker_callback_tag = None
577
 
        self.checker = None
578
 
        if os.WIFEXITED(condition):
579
 
            self.last_checker_status = os.WEXITSTATUS(condition)
580
 
            if self.last_checker_status == 0:
581
 
                logger.info("Checker for %(name)s succeeded",
582
 
                            vars(self))
583
 
                self.checked_ok()
584
 
            else:
585
 
                logger.info("Checker for %(name)s failed",
586
 
                            vars(self))
587
 
        else:
588
 
            self.last_checker_status = -1
589
 
            logger.warning("Checker for %(name)s crashed?",
 
192
        now = datetime.datetime.now()
 
193
        if os.WIFEXITED(condition) \
 
194
               and (os.WEXITSTATUS(condition) == 0):
 
195
            logger.debug(u"Checker for %(name)s succeeded",
 
196
                         vars(self))
 
197
            self.last_seen = now
 
198
            gobject.source_remove(self.stop_initiator_tag)
 
199
            self.stop_initiator_tag = gobject.timeout_add\
 
200
                                      (self._timeout_milliseconds,
 
201
                                       self.stop)
 
202
        elif not os.WIFEXITED(condition):
 
203
            logger.warning(u"Checker for %(name)s crashed?",
590
204
                           vars(self))
591
 
    
592
 
    def checked_ok(self, timeout=None):
593
 
        """Bump up the timeout for this client.
594
 
        
595
 
        This should only be called when the client has been seen,
596
 
        alive and well.
597
 
        """
598
 
        if timeout is None:
599
 
            timeout = self.timeout
600
 
        self.last_checked_ok = datetime.datetime.utcnow()
601
 
        if self.disable_initiator_tag is not None:
602
 
            gobject.source_remove(self.disable_initiator_tag)
603
 
        if getattr(self, "enabled", False):
604
 
            self.disable_initiator_tag = (gobject.timeout_add
605
 
                                          (timedelta_to_milliseconds
606
 
                                           (timeout), self.disable))
607
 
            self.expires = datetime.datetime.utcnow() + timeout
608
 
    
609
 
    def need_approval(self):
610
 
        self.last_approval_request = datetime.datetime.utcnow()
611
 
    
 
205
        else:
 
206
            logger.debug(u"Checker for %(name)s failed",
 
207
                         vars(self))
 
208
            self.checker = None
 
209
        self.checker_callback_tag = None
612
210
    def start_checker(self):
613
211
        """Start a new checker subprocess if one is not running.
614
 
        
615
212
        If a checker already exists, leave it running and do
616
213
        nothing."""
617
 
        # The reason for not killing a running checker is that if we
618
 
        # did that, then if a checker (for some reason) started
619
 
        # running slowly and taking more than 'interval' time, the
620
 
        # client would inevitably timeout, since no checker would get
621
 
        # a chance to run to completion.  If we instead leave running
622
 
        # checkers alone, the checker would have to take more time
623
 
        # than 'timeout' for the client to be disabled, which is as it
624
 
        # should be.
625
 
        
626
 
        # If a checker exists, make sure it is not a zombie
627
 
        try:
628
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
629
 
        except (AttributeError, OSError) as error:
630
 
            if (isinstance(error, OSError)
631
 
                and error.errno != errno.ECHILD):
632
 
                raise error
633
 
        else:
634
 
            if pid:
635
 
                logger.warning("Checker was a zombie")
636
 
                gobject.source_remove(self.checker_callback_tag)
637
 
                self.checker_callback(pid, status,
638
 
                                      self.current_checker_command)
639
 
        # Start a new checker if needed
640
214
        if self.checker is None:
641
215
            try:
642
 
                # In case checker_command has exactly one % operator
643
 
                command = self.checker_command % self.host
 
216
                command = self.check_command % self.fqdn
644
217
            except TypeError:
645
 
                # Escape attributes for the shell
646
 
                escaped_attrs = dict(
647
 
                    (attr,
648
 
                     re.escape(unicode(str(getattr(self, attr, "")),
649
 
                                       errors=
650
 
                                       'replace')))
651
 
                    for attr in
652
 
                    self.runtime_expansions)
653
 
                
 
218
                escaped_attrs = dict((key, re.escape(str(val)))
 
219
                                     for key, val in
 
220
                                     vars(self).iteritems())
654
221
                try:
655
 
                    command = self.checker_command % escaped_attrs
656
 
                except TypeError as error:
657
 
                    logger.error('Could not format string "%s":'
658
 
                                 ' %s', self.checker_command, error)
 
222
                    command = self.check_command % escaped_attrs
 
223
                except TypeError, error:
 
224
                    logger.critical(u'Could not format string "%s":'
 
225
                                    u' %s', self.check_command, error)
659
226
                    return True # Try again later
660
 
            self.current_checker_command = command
661
227
            try:
662
 
                logger.info("Starting checker %r for %s",
663
 
                            command, self.name)
664
 
                # We don't need to redirect stdout and stderr, since
665
 
                # in normal mode, that is already done by daemon(),
666
 
                # and in debug mode we don't want to.  (Stdin is
667
 
                # always replaced by /dev/null.)
668
 
                self.checker = subprocess.Popen(command,
669
 
                                                close_fds=True,
670
 
                                                shell=True, cwd="/")
671
 
                self.checker_callback_tag = (gobject.child_watch_add
672
 
                                             (self.checker.pid,
673
 
                                              self.checker_callback,
674
 
                                              data=command))
675
 
                # The checker may have completed before the gobject
676
 
                # watch was added.  Check for this.
677
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
678
 
                if pid:
679
 
                    gobject.source_remove(self.checker_callback_tag)
680
 
                    self.checker_callback(pid, status, command)
681
 
            except OSError as error:
682
 
                logger.error("Failed to start subprocess: %s",
 
228
                logger.debug(u"Starting checker %r for %s",
 
229
                             command, self.name)
 
230
                self.checker = subprocess.\
 
231
                               Popen(command,
 
232
                                     close_fds=True, shell=True,
 
233
                                     cwd="/")
 
234
                self.checker_callback_tag = gobject.child_watch_add\
 
235
                                            (self.checker.pid,
 
236
                                             self.checker_callback)
 
237
            except subprocess.OSError, error:
 
238
                logger.error(u"Failed to start subprocess: %s",
683
239
                             error)
684
240
        # Re-run this periodically if run by gobject.timeout_add
685
241
        return True
686
 
    
687
242
    def stop_checker(self):
688
243
        """Force the checker process, if any, to stop."""
689
 
        if self.checker_callback_tag:
690
 
            gobject.source_remove(self.checker_callback_tag)
691
 
            self.checker_callback_tag = None
692
 
        if getattr(self, "checker", None) is None:
 
244
        if not hasattr(self, "checker") or self.checker is None:
693
245
            return
694
 
        logger.debug("Stopping checker for %(name)s", vars(self))
695
 
        try:
696
 
            os.kill(self.checker.pid, signal.SIGTERM)
697
 
            #time.sleep(0.5)
698
 
            #if self.checker.poll() is None:
699
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
700
 
        except OSError as error:
701
 
            if error.errno != errno.ESRCH: # No such process
702
 
                raise
703
 
        self.checker = None
704
 
 
705
 
 
706
 
def dbus_service_property(dbus_interface, signature="v",
707
 
                          access="readwrite", byte_arrays=False):
708
 
    """Decorators for marking methods of a DBusObjectWithProperties to
709
 
    become properties on the D-Bus.
710
 
    
711
 
    The decorated method will be called with no arguments by "Get"
712
 
    and with one argument by "Set".
713
 
    
714
 
    The parameters, where they are supported, are the same as
715
 
    dbus.service.method, except there is only "signature", since the
716
 
    type from Get() and the type sent to Set() is the same.
717
 
    """
718
 
    # Encoding deeply encoded byte arrays is not supported yet by the
719
 
    # "Set" method, so we fail early here:
720
 
    if byte_arrays and signature != "ay":
721
 
        raise ValueError("Byte arrays not supported for non-'ay'"
722
 
                         " signature %r" % signature)
723
 
    def decorator(func):
724
 
        func._dbus_is_property = True
725
 
        func._dbus_interface = dbus_interface
726
 
        func._dbus_signature = signature
727
 
        func._dbus_access = access
728
 
        func._dbus_name = func.__name__
729
 
        if func._dbus_name.endswith("_dbus_property"):
730
 
            func._dbus_name = func._dbus_name[:-14]
731
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
732
 
        return func
733
 
    return decorator
734
 
 
735
 
 
736
 
class DBusPropertyException(dbus.exceptions.DBusException):
737
 
    """A base class for D-Bus property-related exceptions
738
 
    """
739
 
    def __unicode__(self):
740
 
        return unicode(str(self))
741
 
 
742
 
 
743
 
class DBusPropertyAccessException(DBusPropertyException):
744
 
    """A property's access permissions disallows an operation.
745
 
    """
746
 
    pass
747
 
 
748
 
 
749
 
class DBusPropertyNotFound(DBusPropertyException):
750
 
    """An attempt was made to access a non-existing property.
751
 
    """
752
 
    pass
753
 
 
754
 
 
755
 
class DBusObjectWithProperties(dbus.service.Object):
756
 
    """A D-Bus object with properties.
757
 
    
758
 
    Classes inheriting from this can use the dbus_service_property
759
 
    decorator to expose methods as D-Bus properties.  It exposes the
760
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
761
 
    """
762
 
    
763
 
    @staticmethod
764
 
    def _is_dbus_property(obj):
765
 
        return getattr(obj, "_dbus_is_property", False)
766
 
    
767
 
    def _get_all_dbus_properties(self):
768
 
        """Returns a generator of (name, attribute) pairs
769
 
        """
770
 
        return ((prop.__get__(self)._dbus_name, prop.__get__(self))
771
 
                for cls in self.__class__.__mro__
772
 
                for name, prop in
773
 
                inspect.getmembers(cls, self._is_dbus_property))
774
 
    
775
 
    def _get_dbus_property(self, interface_name, property_name):
776
 
        """Returns a bound method if one exists which is a D-Bus
777
 
        property with the specified name and interface.
778
 
        """
779
 
        for cls in  self.__class__.__mro__:
780
 
            for name, value in (inspect.getmembers
781
 
                                (cls, self._is_dbus_property)):
782
 
                if (value._dbus_name == property_name
783
 
                    and value._dbus_interface == interface_name):
784
 
                    return value.__get__(self)
785
 
        
786
 
        # No such property
787
 
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
788
 
                                   + interface_name + "."
789
 
                                   + property_name)
790
 
    
791
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
792
 
                         out_signature="v")
793
 
    def Get(self, interface_name, property_name):
794
 
        """Standard D-Bus property Get() method, see D-Bus standard.
795
 
        """
796
 
        prop = self._get_dbus_property(interface_name, property_name)
797
 
        if prop._dbus_access == "write":
798
 
            raise DBusPropertyAccessException(property_name)
799
 
        value = prop()
800
 
        if not hasattr(value, "variant_level"):
801
 
            return value
802
 
        return type(value)(value, variant_level=value.variant_level+1)
803
 
    
804
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
805
 
    def Set(self, interface_name, property_name, value):
806
 
        """Standard D-Bus property Set() method, see D-Bus standard.
807
 
        """
808
 
        prop = self._get_dbus_property(interface_name, property_name)
809
 
        if prop._dbus_access == "read":
810
 
            raise DBusPropertyAccessException(property_name)
811
 
        if prop._dbus_get_args_options["byte_arrays"]:
812
 
            # The byte_arrays option is not supported yet on
813
 
            # signatures other than "ay".
814
 
            if prop._dbus_signature != "ay":
815
 
                raise ValueError
816
 
            value = dbus.ByteArray(''.join(unichr(byte)
817
 
                                           for byte in value))
818
 
        prop(value)
819
 
    
820
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
821
 
                         out_signature="a{sv}")
822
 
    def GetAll(self, interface_name):
823
 
        """Standard D-Bus property GetAll() method, see D-Bus
824
 
        standard.
825
 
        
826
 
        Note: Will not include properties with access="write".
827
 
        """
828
 
        properties = {}
829
 
        for name, prop in self._get_all_dbus_properties():
830
 
            if (interface_name
831
 
                and interface_name != prop._dbus_interface):
832
 
                # Interface non-empty but did not match
833
 
                continue
834
 
            # Ignore write-only properties
835
 
            if prop._dbus_access == "write":
836
 
                continue
837
 
            value = prop()
838
 
            if not hasattr(value, "variant_level"):
839
 
                properties[name] = value
840
 
                continue
841
 
            properties[name] = type(value)(value, variant_level=
842
 
                                           value.variant_level+1)
843
 
        return dbus.Dictionary(properties, signature="sv")
844
 
    
845
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
846
 
                         out_signature="s",
847
 
                         path_keyword='object_path',
848
 
                         connection_keyword='connection')
849
 
    def Introspect(self, object_path, connection):
850
 
        """Standard D-Bus method, overloaded to insert property tags.
851
 
        """
852
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
853
 
                                                   connection)
854
 
        try:
855
 
            document = xml.dom.minidom.parseString(xmlstring)
856
 
            def make_tag(document, name, prop):
857
 
                e = document.createElement("property")
858
 
                e.setAttribute("name", name)
859
 
                e.setAttribute("type", prop._dbus_signature)
860
 
                e.setAttribute("access", prop._dbus_access)
861
 
                return e
862
 
            for if_tag in document.getElementsByTagName("interface"):
863
 
                for tag in (make_tag(document, name, prop)
864
 
                            for name, prop
865
 
                            in self._get_all_dbus_properties()
866
 
                            if prop._dbus_interface
867
 
                            == if_tag.getAttribute("name")):
868
 
                    if_tag.appendChild(tag)
869
 
                # Add the names to the return values for the
870
 
                # "org.freedesktop.DBus.Properties" methods
871
 
                if (if_tag.getAttribute("name")
872
 
                    == "org.freedesktop.DBus.Properties"):
873
 
                    for cn in if_tag.getElementsByTagName("method"):
874
 
                        if cn.getAttribute("name") == "Get":
875
 
                            for arg in cn.getElementsByTagName("arg"):
876
 
                                if (arg.getAttribute("direction")
877
 
                                    == "out"):
878
 
                                    arg.setAttribute("name", "value")
879
 
                        elif cn.getAttribute("name") == "GetAll":
880
 
                            for arg in cn.getElementsByTagName("arg"):
881
 
                                if (arg.getAttribute("direction")
882
 
                                    == "out"):
883
 
                                    arg.setAttribute("name", "props")
884
 
            xmlstring = document.toxml("utf-8")
885
 
            document.unlink()
886
 
        except (AttributeError, xml.dom.DOMException,
887
 
                xml.parsers.expat.ExpatError) as error:
888
 
            logger.error("Failed to override Introspection method",
889
 
                         error)
890
 
        return xmlstring
891
 
 
892
 
 
893
 
def datetime_to_dbus (dt, variant_level=0):
894
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
895
 
    if dt is None:
896
 
        return dbus.String("", variant_level = variant_level)
897
 
    return dbus.String(dt.isoformat(),
898
 
                       variant_level=variant_level)
899
 
 
900
 
 
901
 
class AlternateDBusNamesMetaclass(DBusObjectWithProperties
902
 
                                  .__metaclass__):
903
 
    """Applied to an empty subclass of a D-Bus object, this metaclass
904
 
    will add additional D-Bus attributes matching a certain pattern.
905
 
    """
906
 
    def __new__(mcs, name, bases, attr):
907
 
        # Go through all the base classes which could have D-Bus
908
 
        # methods, signals, or properties in them
909
 
        for base in (b for b in bases
910
 
                     if issubclass(b, dbus.service.Object)):
911
 
            # Go though all attributes of the base class
912
 
            for attrname, attribute in inspect.getmembers(base):
913
 
                # Ignore non-D-Bus attributes, and D-Bus attributes
914
 
                # with the wrong interface name
915
 
                if (not hasattr(attribute, "_dbus_interface")
916
 
                    or not attribute._dbus_interface
917
 
                    .startswith("se.recompile.Mandos")):
918
 
                    continue
919
 
                # Create an alternate D-Bus interface name based on
920
 
                # the current name
921
 
                alt_interface = (attribute._dbus_interface
922
 
                                 .replace("se.recompile.Mandos",
923
 
                                          "se.bsnet.fukt.Mandos"))
924
 
                # Is this a D-Bus signal?
925
 
                if getattr(attribute, "_dbus_is_signal", False):
926
 
                    # Extract the original non-method function by
927
 
                    # black magic
928
 
                    nonmethod_func = (dict(
929
 
                            zip(attribute.func_code.co_freevars,
930
 
                                attribute.__closure__))["func"]
931
 
                                      .cell_contents)
932
 
                    # Create a new, but exactly alike, function
933
 
                    # object, and decorate it to be a new D-Bus signal
934
 
                    # with the alternate D-Bus interface name
935
 
                    new_function = (dbus.service.signal
936
 
                                    (alt_interface,
937
 
                                     attribute._dbus_signature)
938
 
                                    (types.FunctionType(
939
 
                                nonmethod_func.func_code,
940
 
                                nonmethod_func.func_globals,
941
 
                                nonmethod_func.func_name,
942
 
                                nonmethod_func.func_defaults,
943
 
                                nonmethod_func.func_closure)))
944
 
                    # Define a creator of a function to call both the
945
 
                    # old and new functions, so both the old and new
946
 
                    # signals gets sent when the function is called
947
 
                    def fixscope(func1, func2):
948
 
                        """This function is a scope container to pass
949
 
                        func1 and func2 to the "call_both" function
950
 
                        outside of its arguments"""
951
 
                        def call_both(*args, **kwargs):
952
 
                            """This function will emit two D-Bus
953
 
                            signals by calling func1 and func2"""
954
 
                            func1(*args, **kwargs)
955
 
                            func2(*args, **kwargs)
956
 
                        return call_both
957
 
                    # Create the "call_both" function and add it to
958
 
                    # the class
959
 
                    attr[attrname] = fixscope(attribute,
960
 
                                              new_function)
961
 
                # Is this a D-Bus method?
962
 
                elif getattr(attribute, "_dbus_is_method", False):
963
 
                    # Create a new, but exactly alike, function
964
 
                    # object.  Decorate it to be a new D-Bus method
965
 
                    # with the alternate D-Bus interface name.  Add it
966
 
                    # to the class.
967
 
                    attr[attrname] = (dbus.service.method
968
 
                                      (alt_interface,
969
 
                                       attribute._dbus_in_signature,
970
 
                                       attribute._dbus_out_signature)
971
 
                                      (types.FunctionType
972
 
                                       (attribute.func_code,
973
 
                                        attribute.func_globals,
974
 
                                        attribute.func_name,
975
 
                                        attribute.func_defaults,
976
 
                                        attribute.func_closure)))
977
 
                # Is this a D-Bus property?
978
 
                elif getattr(attribute, "_dbus_is_property", False):
979
 
                    # Create a new, but exactly alike, function
980
 
                    # object, and decorate it to be a new D-Bus
981
 
                    # property with the alternate D-Bus interface
982
 
                    # name.  Add it to the class.
983
 
                    attr[attrname] = (dbus_service_property
984
 
                                      (alt_interface,
985
 
                                       attribute._dbus_signature,
986
 
                                       attribute._dbus_access,
987
 
                                       attribute
988
 
                                       ._dbus_get_args_options
989
 
                                       ["byte_arrays"])
990
 
                                      (types.FunctionType
991
 
                                       (attribute.func_code,
992
 
                                        attribute.func_globals,
993
 
                                        attribute.func_name,
994
 
                                        attribute.func_defaults,
995
 
                                        attribute.func_closure)))
996
 
        return type.__new__(mcs, name, bases, attr)
997
 
 
998
 
 
999
 
class ClientDBus(Client, DBusObjectWithProperties):
1000
 
    """A Client class using D-Bus
1001
 
    
1002
 
    Attributes:
1003
 
    dbus_object_path: dbus.ObjectPath
1004
 
    bus: dbus.SystemBus()
1005
 
    """
1006
 
    
1007
 
    runtime_expansions = (Client.runtime_expansions
1008
 
                          + ("dbus_object_path",))
1009
 
    
1010
 
    # dbus.service.Object doesn't use super(), so we can't either.
1011
 
    
1012
 
    def __init__(self, bus = None, *args, **kwargs):
1013
 
        self.bus = bus
1014
 
        Client.__init__(self, *args, **kwargs)
1015
 
        
1016
 
        self._approvals_pending = 0
1017
 
        # Only now, when this client is initialized, can it show up on
1018
 
        # the D-Bus
1019
 
        client_object_name = unicode(self.name).translate(
1020
 
            {ord("."): ord("_"),
1021
 
             ord("-"): ord("_")})
1022
 
        self.dbus_object_path = (dbus.ObjectPath
1023
 
                                 ("/clients/" + client_object_name))
1024
 
        DBusObjectWithProperties.__init__(self, self.bus,
1025
 
                                          self.dbus_object_path)
1026
 
        
1027
 
    def notifychangeproperty(transform_func,
1028
 
                             dbus_name, type_func=lambda x: x,
1029
 
                             variant_level=1):
1030
 
        """ Modify a variable so that it's a property which announces
1031
 
        its changes to DBus.
1032
 
        
1033
 
        transform_fun: Function that takes a value and a variant_level
1034
 
                       and transforms it to a D-Bus type.
1035
 
        dbus_name: D-Bus name of the variable
1036
 
        type_func: Function that transform the value before sending it
1037
 
                   to the D-Bus.  Default: no transform
1038
 
        variant_level: D-Bus variant level.  Default: 1
1039
 
        """
1040
 
        attrname = "_{0}".format(dbus_name)
1041
 
        def setter(self, value):
1042
 
            if hasattr(self, "dbus_object_path"):
1043
 
                if (not hasattr(self, attrname) or
1044
 
                    type_func(getattr(self, attrname, None))
1045
 
                    != type_func(value)):
1046
 
                    dbus_value = transform_func(type_func(value),
1047
 
                                                variant_level
1048
 
                                                =variant_level)
1049
 
                    self.PropertyChanged(dbus.String(dbus_name),
1050
 
                                         dbus_value)
1051
 
            setattr(self, attrname, value)
1052
 
        
1053
 
        return property(lambda self: getattr(self, attrname), setter)
1054
 
    
1055
 
    
1056
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
1057
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
1058
 
                                             "ApprovalPending",
1059
 
                                             type_func = bool)
1060
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1061
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
1062
 
                                        "LastEnabled")
1063
 
    checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
1064
 
                                   type_func = lambda checker:
1065
 
                                       checker is not None)
1066
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
1067
 
                                           "LastCheckedOK")
1068
 
    last_approval_request = notifychangeproperty(
1069
 
        datetime_to_dbus, "LastApprovalRequest")
1070
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
1071
 
                                               "ApprovedByDefault")
1072
 
    approval_delay = notifychangeproperty(dbus.UInt16,
1073
 
                                          "ApprovalDelay",
1074
 
                                          type_func =
1075
 
                                          timedelta_to_milliseconds)
1076
 
    approval_duration = notifychangeproperty(
1077
 
        dbus.UInt16, "ApprovalDuration",
1078
 
        type_func = timedelta_to_milliseconds)
1079
 
    host = notifychangeproperty(dbus.String, "Host")
1080
 
    timeout = notifychangeproperty(dbus.UInt16, "Timeout",
1081
 
                                   type_func =
1082
 
                                   timedelta_to_milliseconds)
1083
 
    extended_timeout = notifychangeproperty(
1084
 
        dbus.UInt16, "ExtendedTimeout",
1085
 
        type_func = timedelta_to_milliseconds)
1086
 
    interval = notifychangeproperty(dbus.UInt16,
1087
 
                                    "Interval",
1088
 
                                    type_func =
1089
 
                                    timedelta_to_milliseconds)
1090
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
1091
 
    
1092
 
    del notifychangeproperty
1093
 
    
1094
 
    def __del__(self, *args, **kwargs):
1095
 
        try:
1096
 
            self.remove_from_connection()
1097
 
        except LookupError:
1098
 
            pass
1099
 
        if hasattr(DBusObjectWithProperties, "__del__"):
1100
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
1101
 
        Client.__del__(self, *args, **kwargs)
1102
 
    
1103
 
    def checker_callback(self, pid, condition, command,
1104
 
                         *args, **kwargs):
 
246
        gobject.source_remove(self.checker_callback_tag)
1105
247
        self.checker_callback_tag = None
 
248
        os.kill(self.checker.pid, signal.SIGTERM)
 
249
        if self.checker.poll() is None:
 
250
            os.kill(self.checker.pid, signal.SIGKILL)
1106
251
        self.checker = None
1107
 
        if os.WIFEXITED(condition):
1108
 
            exitstatus = os.WEXITSTATUS(condition)
1109
 
            # Emit D-Bus signal
1110
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
1111
 
                                  dbus.Int64(condition),
1112
 
                                  dbus.String(command))
1113
 
        else:
1114
 
            # Emit D-Bus signal
1115
 
            self.CheckerCompleted(dbus.Int16(-1),
1116
 
                                  dbus.Int64(condition),
1117
 
                                  dbus.String(command))
1118
 
        
1119
 
        return Client.checker_callback(self, pid, condition, command,
1120
 
                                       *args, **kwargs)
1121
 
    
1122
 
    def start_checker(self, *args, **kwargs):
1123
 
        old_checker = self.checker
1124
 
        if self.checker is not None:
1125
 
            old_checker_pid = self.checker.pid
1126
 
        else:
1127
 
            old_checker_pid = None
1128
 
        r = Client.start_checker(self, *args, **kwargs)
1129
 
        # Only if new checker process was started
1130
 
        if (self.checker is not None
1131
 
            and old_checker_pid != self.checker.pid):
1132
 
            # Emit D-Bus signal
1133
 
            self.CheckerStarted(self.current_checker_command)
1134
 
        return r
1135
 
    
1136
 
    def _reset_approved(self):
1137
 
        self.approved = None
1138
 
        return False
1139
 
    
1140
 
    def approve(self, value=True):
1141
 
        self.send_changedstate()
1142
 
        self.approved = value
1143
 
        gobject.timeout_add(timedelta_to_milliseconds
1144
 
                            (self.approval_duration),
1145
 
                            self._reset_approved)
1146
 
    
1147
 
    
1148
 
    ## D-Bus methods, signals & properties
1149
 
    _interface = "se.recompile.Mandos.Client"
1150
 
    
1151
 
    ## Signals
1152
 
    
1153
 
    # CheckerCompleted - signal
1154
 
    @dbus.service.signal(_interface, signature="nxs")
1155
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
1156
 
        "D-Bus signal"
1157
 
        pass
1158
 
    
1159
 
    # CheckerStarted - signal
1160
 
    @dbus.service.signal(_interface, signature="s")
1161
 
    def CheckerStarted(self, command):
1162
 
        "D-Bus signal"
1163
 
        pass
1164
 
    
1165
 
    # PropertyChanged - signal
1166
 
    @dbus.service.signal(_interface, signature="sv")
1167
 
    def PropertyChanged(self, property, value):
1168
 
        "D-Bus signal"
1169
 
        pass
1170
 
    
1171
 
    # GotSecret - signal
1172
 
    @dbus.service.signal(_interface)
1173
 
    def GotSecret(self):
1174
 
        """D-Bus signal
1175
 
        Is sent after a successful transfer of secret from the Mandos
1176
 
        server to mandos-client
1177
 
        """
1178
 
        pass
1179
 
    
1180
 
    # Rejected - signal
1181
 
    @dbus.service.signal(_interface, signature="s")
1182
 
    def Rejected(self, reason):
1183
 
        "D-Bus signal"
1184
 
        pass
1185
 
    
1186
 
    # NeedApproval - signal
1187
 
    @dbus.service.signal(_interface, signature="tb")
1188
 
    def NeedApproval(self, timeout, default):
1189
 
        "D-Bus signal"
1190
 
        return self.need_approval()
1191
 
    
1192
 
    # NeRwequest - signal
1193
 
    @dbus.service.signal(_interface, signature="s")
1194
 
    def NewRequest(self, ip):
1195
 
        """D-Bus signal
1196
 
        Is sent after a client request a password.
1197
 
        """
1198
 
        pass
1199
 
    
1200
 
    ## Methods
1201
 
    
1202
 
    # Approve - method
1203
 
    @dbus.service.method(_interface, in_signature="b")
1204
 
    def Approve(self, value):
1205
 
        self.approve(value)
1206
 
    
1207
 
    # CheckedOK - method
1208
 
    @dbus.service.method(_interface)
1209
 
    def CheckedOK(self):
1210
 
        self.checked_ok()
1211
 
    
1212
 
    # Enable - method
1213
 
    @dbus.service.method(_interface)
1214
 
    def Enable(self):
1215
 
        "D-Bus method"
1216
 
        self.enable()
1217
 
    
1218
 
    # StartChecker - method
1219
 
    @dbus.service.method(_interface)
1220
 
    def StartChecker(self):
1221
 
        "D-Bus method"
1222
 
        self.start_checker()
1223
 
    
1224
 
    # Disable - method
1225
 
    @dbus.service.method(_interface)
1226
 
    def Disable(self):
1227
 
        "D-Bus method"
1228
 
        self.disable()
1229
 
    
1230
 
    # StopChecker - method
1231
 
    @dbus.service.method(_interface)
1232
 
    def StopChecker(self):
1233
 
        self.stop_checker()
1234
 
    
1235
 
    ## Properties
1236
 
    
1237
 
    # ApprovalPending - property
1238
 
    @dbus_service_property(_interface, signature="b", access="read")
1239
 
    def ApprovalPending_dbus_property(self):
1240
 
        return dbus.Boolean(bool(self.approvals_pending))
1241
 
    
1242
 
    # ApprovedByDefault - property
1243
 
    @dbus_service_property(_interface, signature="b",
1244
 
                           access="readwrite")
1245
 
    def ApprovedByDefault_dbus_property(self, value=None):
1246
 
        if value is None:       # get
1247
 
            return dbus.Boolean(self.approved_by_default)
1248
 
        self.approved_by_default = bool(value)
1249
 
    
1250
 
    # ApprovalDelay - property
1251
 
    @dbus_service_property(_interface, signature="t",
1252
 
                           access="readwrite")
1253
 
    def ApprovalDelay_dbus_property(self, value=None):
1254
 
        if value is None:       # get
1255
 
            return dbus.UInt64(self.approval_delay_milliseconds())
1256
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
1257
 
    
1258
 
    # ApprovalDuration - property
1259
 
    @dbus_service_property(_interface, signature="t",
1260
 
                           access="readwrite")
1261
 
    def ApprovalDuration_dbus_property(self, value=None):
1262
 
        if value is None:       # get
1263
 
            return dbus.UInt64(timedelta_to_milliseconds(
1264
 
                    self.approval_duration))
1265
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
1266
 
    
1267
 
    # Name - property
1268
 
    @dbus_service_property(_interface, signature="s", access="read")
1269
 
    def Name_dbus_property(self):
1270
 
        return dbus.String(self.name)
1271
 
    
1272
 
    # Fingerprint - property
1273
 
    @dbus_service_property(_interface, signature="s", access="read")
1274
 
    def Fingerprint_dbus_property(self):
1275
 
        return dbus.String(self.fingerprint)
1276
 
    
1277
 
    # Host - property
1278
 
    @dbus_service_property(_interface, signature="s",
1279
 
                           access="readwrite")
1280
 
    def Host_dbus_property(self, value=None):
1281
 
        if value is None:       # get
1282
 
            return dbus.String(self.host)
1283
 
        self.host = unicode(value)
1284
 
    
1285
 
    # Created - property
1286
 
    @dbus_service_property(_interface, signature="s", access="read")
1287
 
    def Created_dbus_property(self):
1288
 
        return datetime_to_dbus(self.created)
1289
 
    
1290
 
    # LastEnabled - property
1291
 
    @dbus_service_property(_interface, signature="s", access="read")
1292
 
    def LastEnabled_dbus_property(self):
1293
 
        return datetime_to_dbus(self.last_enabled)
1294
 
    
1295
 
    # Enabled - property
1296
 
    @dbus_service_property(_interface, signature="b",
1297
 
                           access="readwrite")
1298
 
    def Enabled_dbus_property(self, value=None):
1299
 
        if value is None:       # get
1300
 
            return dbus.Boolean(self.enabled)
1301
 
        if value:
1302
 
            self.enable()
1303
 
        else:
1304
 
            self.disable()
1305
 
    
1306
 
    # LastCheckedOK - property
1307
 
    @dbus_service_property(_interface, signature="s",
1308
 
                           access="readwrite")
1309
 
    def LastCheckedOK_dbus_property(self, value=None):
1310
 
        if value is not None:
1311
 
            self.checked_ok()
1312
 
            return
1313
 
        return datetime_to_dbus(self.last_checked_ok)
1314
 
    
1315
 
    # Expires - property
1316
 
    @dbus_service_property(_interface, signature="s", access="read")
1317
 
    def Expires_dbus_property(self):
1318
 
        return datetime_to_dbus(self.expires)
1319
 
    
1320
 
    # LastApprovalRequest - property
1321
 
    @dbus_service_property(_interface, signature="s", access="read")
1322
 
    def LastApprovalRequest_dbus_property(self):
1323
 
        return datetime_to_dbus(self.last_approval_request)
1324
 
    
1325
 
    # Timeout - property
1326
 
    @dbus_service_property(_interface, signature="t",
1327
 
                           access="readwrite")
1328
 
    def Timeout_dbus_property(self, value=None):
1329
 
        if value is None:       # get
1330
 
            return dbus.UInt64(self.timeout_milliseconds())
1331
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1332
 
        if getattr(self, "disable_initiator_tag", None) is None:
1333
 
            return
1334
 
        # Reschedule timeout
1335
 
        gobject.source_remove(self.disable_initiator_tag)
1336
 
        self.disable_initiator_tag = None
1337
 
        self.expires = None
1338
 
        time_to_die = timedelta_to_milliseconds((self
1339
 
                                                 .last_checked_ok
1340
 
                                                 + self.timeout)
1341
 
                                                - datetime.datetime
1342
 
                                                .utcnow())
1343
 
        if time_to_die <= 0:
1344
 
            # The timeout has passed
1345
 
            self.disable()
1346
 
        else:
1347
 
            self.expires = (datetime.datetime.utcnow()
1348
 
                            + datetime.timedelta(milliseconds =
1349
 
                                                 time_to_die))
1350
 
            self.disable_initiator_tag = (gobject.timeout_add
1351
 
                                          (time_to_die, self.disable))
1352
 
    
1353
 
    # ExtendedTimeout - property
1354
 
    @dbus_service_property(_interface, signature="t",
1355
 
                           access="readwrite")
1356
 
    def ExtendedTimeout_dbus_property(self, value=None):
1357
 
        if value is None:       # get
1358
 
            return dbus.UInt64(self.extended_timeout_milliseconds())
1359
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1360
 
    
1361
 
    # Interval - property
1362
 
    @dbus_service_property(_interface, signature="t",
1363
 
                           access="readwrite")
1364
 
    def Interval_dbus_property(self, value=None):
1365
 
        if value is None:       # get
1366
 
            return dbus.UInt64(self.interval_milliseconds())
1367
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1368
 
        if getattr(self, "checker_initiator_tag", None) is None:
1369
 
            return
1370
 
        if self.enabled:
1371
 
            # Reschedule checker run
1372
 
            gobject.source_remove(self.checker_initiator_tag)
1373
 
            self.checker_initiator_tag = (gobject.timeout_add
1374
 
                                          (value, self.start_checker))
1375
 
            self.start_checker()    # Start one now, too
1376
 
    
1377
 
    # Checker - property
1378
 
    @dbus_service_property(_interface, signature="s",
1379
 
                           access="readwrite")
1380
 
    def Checker_dbus_property(self, value=None):
1381
 
        if value is None:       # get
1382
 
            return dbus.String(self.checker_command)
1383
 
        self.checker_command = unicode(value)
1384
 
    
1385
 
    # CheckerRunning - property
1386
 
    @dbus_service_property(_interface, signature="b",
1387
 
                           access="readwrite")
1388
 
    def CheckerRunning_dbus_property(self, value=None):
1389
 
        if value is None:       # get
1390
 
            return dbus.Boolean(self.checker is not None)
1391
 
        if value:
1392
 
            self.start_checker()
1393
 
        else:
1394
 
            self.stop_checker()
1395
 
    
1396
 
    # ObjectPath - property
1397
 
    @dbus_service_property(_interface, signature="o", access="read")
1398
 
    def ObjectPath_dbus_property(self):
1399
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1400
 
    
1401
 
    # Secret = property
1402
 
    @dbus_service_property(_interface, signature="ay",
1403
 
                           access="write", byte_arrays=True)
1404
 
    def Secret_dbus_property(self, value):
1405
 
        self.secret = str(value)
1406
 
    
1407
 
    del _interface
1408
 
 
1409
 
 
1410
 
class ProxyClient(object):
1411
 
    def __init__(self, child_pipe, fpr, address):
1412
 
        self._pipe = child_pipe
1413
 
        self._pipe.send(('init', fpr, address))
1414
 
        if not self._pipe.recv():
1415
 
            raise KeyError()
1416
 
    
1417
 
    def __getattribute__(self, name):
1418
 
        if name == '_pipe':
1419
 
            return super(ProxyClient, self).__getattribute__(name)
1420
 
        self._pipe.send(('getattr', name))
1421
 
        data = self._pipe.recv()
1422
 
        if data[0] == 'data':
1423
 
            return data[1]
1424
 
        if data[0] == 'function':
1425
 
            def func(*args, **kwargs):
1426
 
                self._pipe.send(('funcall', name, args, kwargs))
1427
 
                return self._pipe.recv()[1]
1428
 
            return func
1429
 
    
1430
 
    def __setattr__(self, name, value):
1431
 
        if name == '_pipe':
1432
 
            return super(ProxyClient, self).__setattr__(name, value)
1433
 
        self._pipe.send(('setattr', name, value))
1434
 
 
1435
 
 
1436
 
class ClientDBusTransitional(ClientDBus):
1437
 
    __metaclass__ = AlternateDBusNamesMetaclass
1438
 
 
1439
 
 
1440
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1441
 
    """A class to handle client connections.
1442
 
    
1443
 
    Instantiated once for each connection to handle it.
 
252
    def still_valid(self, now=None):
 
253
        """Has the timeout not yet passed for this client?"""
 
254
        if now is None:
 
255
            now = datetime.datetime.now()
 
256
        if self.last_seen is None:
 
257
            return now < (self.created + self.timeout)
 
258
        else:
 
259
            return now < (self.last_seen + self.timeout)
 
260
 
 
261
 
 
262
def peer_certificate(session):
 
263
    "Return an OpenPGP data packet string for the peer's certificate"
 
264
    # If not an OpenPGP certificate...
 
265
    if gnutls.library.functions.gnutls_certificate_type_get\
 
266
            (session._c_object) \
 
267
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
268
        # ...do the normal thing
 
269
        return session.peer_certificate
 
270
    list_size = ctypes.c_uint()
 
271
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
272
        (session._c_object, ctypes.byref(list_size))
 
273
    if list_size.value == 0:
 
274
        return None
 
275
    cert = cert_list[0]
 
276
    return ctypes.string_at(cert.data, cert.size)
 
277
 
 
278
 
 
279
def fingerprint(openpgp):
 
280
    "Convert an OpenPGP data string to a hexdigit fingerprint string"
 
281
    # New empty GnuTLS certificate
 
282
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
283
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
284
        (ctypes.byref(crt))
 
285
    # New GnuTLS "datum" with the OpenPGP public key
 
286
    datum = gnutls.library.types.gnutls_datum_t\
 
287
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
288
                     ctypes.POINTER(ctypes.c_ubyte)),
 
289
         ctypes.c_uint(len(openpgp)))
 
290
    # Import the OpenPGP public key into the certificate
 
291
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
292
        (crt,
 
293
         ctypes.byref(datum),
 
294
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
295
    # New buffer for the fingerprint
 
296
    buffer = ctypes.create_string_buffer(20)
 
297
    buffer_length = ctypes.c_size_t()
 
298
    # Get the fingerprint from the certificate into the buffer
 
299
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
300
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
301
    # Deinit the certificate
 
302
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
303
    # Convert the buffer to a Python bytestring
 
304
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
305
    # Convert the bytestring to hexadecimal notation
 
306
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
307
    return hex_fpr
 
308
 
 
309
 
 
310
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
311
    """A TCP request handler class.
 
312
    Instantiated by IPv6_TCPServer for each request to handle it.
1444
313
    Note: This will run in its own forked process."""
1445
314
    
1446
315
    def handle(self):
1447
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1448
 
            logger.info("TCP connection from: %s",
1449
 
                        unicode(self.client_address))
1450
 
            logger.debug("Pipe FD: %d",
1451
 
                         self.server.child_pipe.fileno())
1452
 
            
1453
 
            session = (gnutls.connection
1454
 
                       .ClientSession(self.request,
1455
 
                                      gnutls.connection
1456
 
                                      .X509Credentials()))
1457
 
            
1458
 
            # Note: gnutls.connection.X509Credentials is really a
1459
 
            # generic GnuTLS certificate credentials object so long as
1460
 
            # no X.509 keys are added to it.  Therefore, we can use it
1461
 
            # here despite using OpenPGP certificates.
1462
 
            
1463
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
1464
 
            #                      "+AES-256-CBC", "+SHA1",
1465
 
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
1466
 
            #                      "+DHE-DSS"))
1467
 
            # Use a fallback default, since this MUST be set.
1468
 
            priority = self.server.gnutls_priority
1469
 
            if priority is None:
1470
 
                priority = "NORMAL"
1471
 
            (gnutls.library.functions
1472
 
             .gnutls_priority_set_direct(session._c_object,
1473
 
                                         priority, None))
1474
 
            
1475
 
            # Start communication using the Mandos protocol
1476
 
            # Get protocol number
1477
 
            line = self.request.makefile().readline()
1478
 
            logger.debug("Protocol version: %r", line)
1479
 
            try:
1480
 
                if int(line.strip().split()[0]) > 1:
1481
 
                    raise RuntimeError
1482
 
            except (ValueError, IndexError, RuntimeError) as error:
1483
 
                logger.error("Unknown protocol version: %s", error)
1484
 
                return
1485
 
            
1486
 
            # Start GnuTLS connection
1487
 
            try:
1488
 
                session.handshake()
1489
 
            except gnutls.errors.GNUTLSError as error:
1490
 
                logger.warning("Handshake failed: %s", error)
1491
 
                # Do not run session.bye() here: the session is not
1492
 
                # established.  Just abandon the request.
1493
 
                return
1494
 
            logger.debug("Handshake succeeded")
1495
 
            
1496
 
            approval_required = False
1497
 
            try:
1498
 
                try:
1499
 
                    fpr = self.fingerprint(self.peer_certificate
1500
 
                                           (session))
1501
 
                except (TypeError,
1502
 
                        gnutls.errors.GNUTLSError) as error:
1503
 
                    logger.warning("Bad certificate: %s", error)
1504
 
                    return
1505
 
                logger.debug("Fingerprint: %s", fpr)
1506
 
                
1507
 
                try:
1508
 
                    client = ProxyClient(child_pipe, fpr,
1509
 
                                         self.client_address)
1510
 
                except KeyError:
1511
 
                    return
1512
 
                
1513
 
                if self.server.use_dbus:
1514
 
                    # Emit D-Bus signal
1515
 
                    client.NewRequest(str(self.client_address))
1516
 
                
1517
 
                if client.approval_delay:
1518
 
                    delay = client.approval_delay
1519
 
                    client.approvals_pending += 1
1520
 
                    approval_required = True
1521
 
                
1522
 
                while True:
1523
 
                    if not client.enabled:
1524
 
                        logger.info("Client %s is disabled",
1525
 
                                       client.name)
1526
 
                        if self.server.use_dbus:
1527
 
                            # Emit D-Bus signal
1528
 
                            client.Rejected("Disabled")
1529
 
                        return
1530
 
                    
1531
 
                    if client.approved or not client.approval_delay:
1532
 
                        #We are approved or approval is disabled
1533
 
                        break
1534
 
                    elif client.approved is None:
1535
 
                        logger.info("Client %s needs approval",
1536
 
                                    client.name)
1537
 
                        if self.server.use_dbus:
1538
 
                            # Emit D-Bus signal
1539
 
                            client.NeedApproval(
1540
 
                                client.approval_delay_milliseconds(),
1541
 
                                client.approved_by_default)
1542
 
                    else:
1543
 
                        logger.warning("Client %s was not approved",
1544
 
                                       client.name)
1545
 
                        if self.server.use_dbus:
1546
 
                            # Emit D-Bus signal
1547
 
                            client.Rejected("Denied")
1548
 
                        return
1549
 
                    
1550
 
                    #wait until timeout or approved
1551
 
                    time = datetime.datetime.now()
1552
 
                    client.changedstate.acquire()
1553
 
                    (client.changedstate.wait
1554
 
                     (float(client.timedelta_to_milliseconds(delay)
1555
 
                            / 1000)))
1556
 
                    client.changedstate.release()
1557
 
                    time2 = datetime.datetime.now()
1558
 
                    if (time2 - time) >= delay:
1559
 
                        if not client.approved_by_default:
1560
 
                            logger.warning("Client %s timed out while"
1561
 
                                           " waiting for approval",
1562
 
                                           client.name)
1563
 
                            if self.server.use_dbus:
1564
 
                                # Emit D-Bus signal
1565
 
                                client.Rejected("Approval timed out")
1566
 
                            return
1567
 
                        else:
1568
 
                            break
1569
 
                    else:
1570
 
                        delay -= time2 - time
1571
 
                
1572
 
                sent_size = 0
1573
 
                while sent_size < len(client.secret):
1574
 
                    try:
1575
 
                        sent = session.send(client.secret[sent_size:])
1576
 
                    except gnutls.errors.GNUTLSError as error:
1577
 
                        logger.warning("gnutls send failed")
1578
 
                        return
1579
 
                    logger.debug("Sent: %d, remaining: %d",
1580
 
                                 sent, len(client.secret)
1581
 
                                 - (sent_size + sent))
1582
 
                    sent_size += sent
1583
 
                
1584
 
                logger.info("Sending secret to %s", client.name)
1585
 
                # bump the timeout using extended_timeout
1586
 
                client.checked_ok(client.extended_timeout)
1587
 
                if self.server.use_dbus:
1588
 
                    # Emit D-Bus signal
1589
 
                    client.GotSecret()
1590
 
            
1591
 
            finally:
1592
 
                if approval_required:
1593
 
                    client.approvals_pending -= 1
1594
 
                try:
1595
 
                    session.bye()
1596
 
                except gnutls.errors.GNUTLSError as error:
1597
 
                    logger.warning("GnuTLS bye failed")
1598
 
    
1599
 
    @staticmethod
1600
 
    def peer_certificate(session):
1601
 
        "Return the peer's OpenPGP certificate as a bytestring"
1602
 
        # If not an OpenPGP certificate...
1603
 
        if (gnutls.library.functions
1604
 
            .gnutls_certificate_type_get(session._c_object)
1605
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1606
 
            # ...do the normal thing
1607
 
            return session.peer_certificate
1608
 
        list_size = ctypes.c_uint(1)
1609
 
        cert_list = (gnutls.library.functions
1610
 
                     .gnutls_certificate_get_peers
1611
 
                     (session._c_object, ctypes.byref(list_size)))
1612
 
        if not bool(cert_list) and list_size.value != 0:
1613
 
            raise gnutls.errors.GNUTLSError("error getting peer"
1614
 
                                            " certificate")
1615
 
        if list_size.value == 0:
1616
 
            return None
1617
 
        cert = cert_list[0]
1618
 
        return ctypes.string_at(cert.data, cert.size)
1619
 
    
1620
 
    @staticmethod
1621
 
    def fingerprint(openpgp):
1622
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1623
 
        # New GnuTLS "datum" with the OpenPGP public key
1624
 
        datum = (gnutls.library.types
1625
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1626
 
                                             ctypes.POINTER
1627
 
                                             (ctypes.c_ubyte)),
1628
 
                                 ctypes.c_uint(len(openpgp))))
1629
 
        # New empty GnuTLS certificate
1630
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1631
 
        (gnutls.library.functions
1632
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1633
 
        # Import the OpenPGP public key into the certificate
1634
 
        (gnutls.library.functions
1635
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1636
 
                                    gnutls.library.constants
1637
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1638
 
        # Verify the self signature in the key
1639
 
        crtverify = ctypes.c_uint()
1640
 
        (gnutls.library.functions
1641
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1642
 
                                         ctypes.byref(crtverify)))
1643
 
        if crtverify.value != 0:
1644
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1645
 
            raise (gnutls.errors.CertificateSecurityError
1646
 
                   ("Verify failed"))
1647
 
        # New buffer for the fingerprint
1648
 
        buf = ctypes.create_string_buffer(20)
1649
 
        buf_len = ctypes.c_size_t()
1650
 
        # Get the fingerprint from the certificate into the buffer
1651
 
        (gnutls.library.functions
1652
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1653
 
                                             ctypes.byref(buf_len)))
1654
 
        # Deinit the certificate
1655
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1656
 
        # Convert the buffer to a Python bytestring
1657
 
        fpr = ctypes.string_at(buf, buf_len.value)
1658
 
        # Convert the bytestring to hexadecimal notation
1659
 
        hex_fpr = binascii.hexlify(fpr).upper()
1660
 
        return hex_fpr
1661
 
 
1662
 
 
1663
 
class MultiprocessingMixIn(object):
1664
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1665
 
    def sub_process_main(self, request, address):
1666
 
        try:
1667
 
            self.finish_request(request, address)
1668
 
        except:
1669
 
            self.handle_error(request, address)
1670
 
        self.close_request(request)
1671
 
    
1672
 
    def process_request(self, request, address):
1673
 
        """Start a new process to process the request."""
1674
 
        proc = multiprocessing.Process(target = self.sub_process_main,
1675
 
                                       args = (request,
1676
 
                                               address))
1677
 
        proc.start()
1678
 
        return proc
1679
 
 
1680
 
 
1681
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1682
 
    """ adds a pipe to the MixIn """
1683
 
    def process_request(self, request, client_address):
1684
 
        """Overrides and wraps the original process_request().
1685
 
        
1686
 
        This function creates a new pipe in self.pipe
1687
 
        """
1688
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1689
 
        
1690
 
        proc = MultiprocessingMixIn.process_request(self, request,
1691
 
                                                    client_address)
1692
 
        self.child_pipe.close()
1693
 
        self.add_pipe(parent_pipe, proc)
1694
 
    
1695
 
    def add_pipe(self, parent_pipe, proc):
1696
 
        """Dummy function; override as necessary"""
1697
 
        raise NotImplementedError
1698
 
 
1699
 
 
1700
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1701
 
                     socketserver.TCPServer, object):
1702
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1703
 
    
 
316
        logger.debug(u"TCP connection from: %s",
 
317
                     unicode(self.client_address))
 
318
        session = gnutls.connection.ClientSession(self.request,
 
319
                                                  gnutls.connection.\
 
320
                                                  X509Credentials())
 
321
        
 
322
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
323
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
324
        #                "+DHE-DSS"))
 
325
        priority = "SECURE256"
 
326
        
 
327
        gnutls.library.functions.gnutls_priority_set_direct\
 
328
            (session._c_object, priority, None);
 
329
        
 
330
        try:
 
331
            session.handshake()
 
332
        except gnutls.errors.GNUTLSError, error:
 
333
            logger.debug(u"Handshake failed: %s", error)
 
334
            # Do not run session.bye() here: the session is not
 
335
            # established.  Just abandon the request.
 
336
            return
 
337
        try:
 
338
            fpr = fingerprint(peer_certificate(session))
 
339
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
340
            logger.debug(u"Bad certificate: %s", error)
 
341
            session.bye()
 
342
            return
 
343
        logger.debug(u"Fingerprint: %s", fpr)
 
344
        client = None
 
345
        for c in clients:
 
346
            if c.fingerprint == fpr:
 
347
                client = c
 
348
                break
 
349
        # Have to check if client.still_valid(), since it is possible
 
350
        # that the client timed out while establishing the GnuTLS
 
351
        # session.
 
352
        if (not client) or (not client.still_valid()):
 
353
            if client:
 
354
                logger.debug(u"Client %(name)s is invalid",
 
355
                             vars(client))
 
356
            else:
 
357
                logger.debug(u"Client not found for fingerprint: %s",
 
358
                             fpr)
 
359
            session.bye()
 
360
            return
 
361
        sent_size = 0
 
362
        while sent_size < len(client.secret):
 
363
            sent = session.send(client.secret[sent_size:])
 
364
            logger.debug(u"Sent: %d, remaining: %d",
 
365
                         sent, len(client.secret)
 
366
                         - (sent_size + sent))
 
367
            sent_size += sent
 
368
        session.bye()
 
369
 
 
370
 
 
371
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
372
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
1704
373
    Attributes:
1705
 
        enabled:        Boolean; whether this server is activated yet
1706
 
        interface:      None or a network interface name (string)
1707
 
        use_ipv6:       Boolean; to use IPv6 or not
 
374
        options:        Command line options
 
375
        clients:        Set() of Client objects
1708
376
    """
1709
 
    def __init__(self, server_address, RequestHandlerClass,
1710
 
                 interface=None, use_ipv6=True):
1711
 
        self.interface = interface
1712
 
        if use_ipv6:
1713
 
            self.address_family = socket.AF_INET6
1714
 
        socketserver.TCPServer.__init__(self, server_address,
1715
 
                                        RequestHandlerClass)
 
377
    address_family = socket.AF_INET6
 
378
    def __init__(self, *args, **kwargs):
 
379
        if "options" in kwargs:
 
380
            self.options = kwargs["options"]
 
381
            del kwargs["options"]
 
382
        if "clients" in kwargs:
 
383
            self.clients = kwargs["clients"]
 
384
            del kwargs["clients"]
 
385
        return super(type(self), self).__init__(*args, **kwargs)
1716
386
    def server_bind(self):
1717
387
        """This overrides the normal server_bind() function
1718
388
        to bind to an interface if one was specified, and also NOT to
1719
389
        bind to an address or port if they were not specified."""
1720
 
        if self.interface is not None:
1721
 
            if SO_BINDTODEVICE is None:
1722
 
                logger.error("SO_BINDTODEVICE does not exist;"
1723
 
                             " cannot bind to interface %s",
1724
 
                             self.interface)
1725
 
            else:
1726
 
                try:
1727
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1728
 
                                           SO_BINDTODEVICE,
1729
 
                                           str(self.interface
1730
 
                                               + '\0'))
1731
 
                except socket.error as error:
1732
 
                    if error[0] == errno.EPERM:
1733
 
                        logger.error("No permission to"
1734
 
                                     " bind to interface %s",
1735
 
                                     self.interface)
1736
 
                    elif error[0] == errno.ENOPROTOOPT:
1737
 
                        logger.error("SO_BINDTODEVICE not available;"
1738
 
                                     " cannot bind to interface %s",
1739
 
                                     self.interface)
1740
 
                    else:
1741
 
                        raise
 
390
        if self.options.interface:
 
391
            if not hasattr(socket, "SO_BINDTODEVICE"):
 
392
                # From /usr/include/asm-i486/socket.h
 
393
                socket.SO_BINDTODEVICE = 25
 
394
            try:
 
395
                self.socket.setsockopt(socket.SOL_SOCKET,
 
396
                                       socket.SO_BINDTODEVICE,
 
397
                                       self.options.interface)
 
398
            except socket.error, error:
 
399
                if error[0] == errno.EPERM:
 
400
                    logger.warning(u"No permission to"
 
401
                                   u" bind to interface %s",
 
402
                                   self.options.interface)
 
403
                else:
 
404
                    raise error
1742
405
        # Only bind(2) the socket if we really need to.
1743
406
        if self.server_address[0] or self.server_address[1]:
1744
407
            if not self.server_address[0]:
1745
 
                if self.address_family == socket.AF_INET6:
1746
 
                    any_address = "::" # in6addr_any
1747
 
                else:
1748
 
                    any_address = socket.INADDR_ANY
1749
 
                self.server_address = (any_address,
 
408
                in6addr_any = "::"
 
409
                self.server_address = (in6addr_any,
1750
410
                                       self.server_address[1])
1751
 
            elif not self.server_address[1]:
 
411
            elif self.server_address[1] is None:
1752
412
                self.server_address = (self.server_address[0],
1753
413
                                       0)
1754
 
#                 if self.interface:
1755
 
#                     self.server_address = (self.server_address[0],
1756
 
#                                            0, # port
1757
 
#                                            0, # flowinfo
1758
 
#                                            if_nametoindex
1759
 
#                                            (self.interface))
1760
 
            return socketserver.TCPServer.server_bind(self)
1761
 
 
1762
 
 
1763
 
class MandosServer(IPv6_TCPServer):
1764
 
    """Mandos server.
1765
 
    
1766
 
    Attributes:
1767
 
        clients:        set of Client objects
1768
 
        gnutls_priority GnuTLS priority string
1769
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1770
 
    
1771
 
    Assumes a gobject.MainLoop event loop.
1772
 
    """
1773
 
    def __init__(self, server_address, RequestHandlerClass,
1774
 
                 interface=None, use_ipv6=True, clients=None,
1775
 
                 gnutls_priority=None, use_dbus=True):
1776
 
        self.enabled = False
1777
 
        self.clients = clients
1778
 
        if self.clients is None:
1779
 
            self.clients = {}
1780
 
        self.use_dbus = use_dbus
1781
 
        self.gnutls_priority = gnutls_priority
1782
 
        IPv6_TCPServer.__init__(self, server_address,
1783
 
                                RequestHandlerClass,
1784
 
                                interface = interface,
1785
 
                                use_ipv6 = use_ipv6)
1786
 
    def server_activate(self):
1787
 
        if self.enabled:
1788
 
            return socketserver.TCPServer.server_activate(self)
1789
 
    
1790
 
    def enable(self):
1791
 
        self.enabled = True
1792
 
    
1793
 
    def add_pipe(self, parent_pipe, proc):
1794
 
        # Call "handle_ipc" for both data and EOF events
1795
 
        gobject.io_add_watch(parent_pipe.fileno(),
1796
 
                             gobject.IO_IN | gobject.IO_HUP,
1797
 
                             functools.partial(self.handle_ipc,
1798
 
                                               parent_pipe =
1799
 
                                               parent_pipe,
1800
 
                                               proc = proc))
1801
 
    
1802
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1803
 
                   proc = None, client_object=None):
1804
 
        condition_names = {
1805
 
            gobject.IO_IN: "IN",   # There is data to read.
1806
 
            gobject.IO_OUT: "OUT", # Data can be written (without
1807
 
                                    # blocking).
1808
 
            gobject.IO_PRI: "PRI", # There is urgent data to read.
1809
 
            gobject.IO_ERR: "ERR", # Error condition.
1810
 
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
1811
 
                                    # broken, usually for pipes and
1812
 
                                    # sockets).
1813
 
            }
1814
 
        conditions_string = ' | '.join(name
1815
 
                                       for cond, name in
1816
 
                                       condition_names.iteritems()
1817
 
                                       if cond & condition)
1818
 
        # error, or the other end of multiprocessing.Pipe has closed
1819
 
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1820
 
            # Wait for other process to exit
1821
 
            proc.join()
1822
 
            return False
1823
 
        
1824
 
        # Read a request from the child
1825
 
        request = parent_pipe.recv()
1826
 
        command = request[0]
1827
 
        
1828
 
        if command == 'init':
1829
 
            fpr = request[1]
1830
 
            address = request[2]
1831
 
            
1832
 
            for c in self.clients.itervalues():
1833
 
                if c.fingerprint == fpr:
1834
 
                    client = c
1835
 
                    break
1836
 
            else:
1837
 
                logger.info("Client not found for fingerprint: %s, ad"
1838
 
                            "dress: %s", fpr, address)
1839
 
                if self.use_dbus:
1840
 
                    # Emit D-Bus signal
1841
 
                    mandos_dbus_service.ClientNotFound(fpr,
1842
 
                                                       address[0])
1843
 
                parent_pipe.send(False)
1844
 
                return False
1845
 
            
1846
 
            gobject.io_add_watch(parent_pipe.fileno(),
1847
 
                                 gobject.IO_IN | gobject.IO_HUP,
1848
 
                                 functools.partial(self.handle_ipc,
1849
 
                                                   parent_pipe =
1850
 
                                                   parent_pipe,
1851
 
                                                   proc = proc,
1852
 
                                                   client_object =
1853
 
                                                   client))
1854
 
            parent_pipe.send(True)
1855
 
            # remove the old hook in favor of the new above hook on
1856
 
            # same fileno
1857
 
            return False
1858
 
        if command == 'funcall':
1859
 
            funcname = request[1]
1860
 
            args = request[2]
1861
 
            kwargs = request[3]
1862
 
            
1863
 
            parent_pipe.send(('data', getattr(client_object,
1864
 
                                              funcname)(*args,
1865
 
                                                         **kwargs)))
1866
 
        
1867
 
        if command == 'getattr':
1868
 
            attrname = request[1]
1869
 
            if callable(client_object.__getattribute__(attrname)):
1870
 
                parent_pipe.send(('function',))
1871
 
            else:
1872
 
                parent_pipe.send(('data', client_object
1873
 
                                  .__getattribute__(attrname)))
1874
 
        
1875
 
        if command == 'setattr':
1876
 
            attrname = request[1]
1877
 
            value = request[2]
1878
 
            setattr(client_object, attrname, value)
1879
 
        
1880
 
        return True
 
414
            return super(type(self), self).server_bind()
1881
415
 
1882
416
 
1883
417
def string_to_delta(interval):
1884
418
    """Parse a string and return a datetime.timedelta
1885
 
    
 
419
 
1886
420
    >>> string_to_delta('7d')
1887
421
    datetime.timedelta(7)
1888
422
    >>> string_to_delta('60s')
1891
425
    datetime.timedelta(0, 3600)
1892
426
    >>> string_to_delta('24h')
1893
427
    datetime.timedelta(1)
1894
 
    >>> string_to_delta('1w')
 
428
    >>> string_to_delta(u'1w')
1895
429
    datetime.timedelta(7)
1896
 
    >>> string_to_delta('5m 30s')
1897
 
    datetime.timedelta(0, 330)
1898
430
    """
1899
 
    timevalue = datetime.timedelta(0)
1900
 
    for s in interval.split():
1901
 
        try:
1902
 
            suffix = unicode(s[-1])
1903
 
            value = int(s[:-1])
1904
 
            if suffix == "d":
1905
 
                delta = datetime.timedelta(value)
1906
 
            elif suffix == "s":
1907
 
                delta = datetime.timedelta(0, value)
1908
 
            elif suffix == "m":
1909
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1910
 
            elif suffix == "h":
1911
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1912
 
            elif suffix == "w":
1913
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1914
 
            else:
1915
 
                raise ValueError("Unknown suffix %r" % suffix)
1916
 
        except (ValueError, IndexError) as e:
1917
 
            raise ValueError(*(e.args))
1918
 
        timevalue += delta
1919
 
    return timevalue
1920
 
 
1921
 
 
1922
 
def daemon(nochdir = False, noclose = False):
 
431
    try:
 
432
        suffix=unicode(interval[-1])
 
433
        value=int(interval[:-1])
 
434
        if suffix == u"d":
 
435
            delta = datetime.timedelta(value)
 
436
        elif suffix == u"s":
 
437
            delta = datetime.timedelta(0, value)
 
438
        elif suffix == u"m":
 
439
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
440
        elif suffix == u"h":
 
441
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
442
        elif suffix == u"w":
 
443
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
444
        else:
 
445
            raise ValueError
 
446
    except (ValueError, IndexError):
 
447
        raise ValueError
 
448
    return delta
 
449
 
 
450
 
 
451
def add_service():
 
452
    """From the Avahi server example code"""
 
453
    global group, serviceName, serviceType, servicePort, serviceTXT, \
 
454
           domain, host
 
455
    if group is None:
 
456
        group = dbus.Interface(
 
457
                bus.get_object( avahi.DBUS_NAME,
 
458
                                server.EntryGroupNew()),
 
459
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
460
        group.connect_to_signal('StateChanged',
 
461
                                entry_group_state_changed)
 
462
    logger.debug(u"Adding service '%s' of type '%s' ...",
 
463
                 serviceName, serviceType)
 
464
    
 
465
    group.AddService(
 
466
            serviceInterface,           # interface
 
467
            avahi.PROTO_INET6,          # protocol
 
468
            dbus.UInt32(0),             # flags
 
469
            serviceName, serviceType,
 
470
            domain, host,
 
471
            dbus.UInt16(servicePort),
 
472
            avahi.string_array_to_txt_array(serviceTXT))
 
473
    group.Commit()
 
474
 
 
475
 
 
476
def remove_service():
 
477
    """From the Avahi server example code"""
 
478
    global group
 
479
    
 
480
    if not group is None:
 
481
        group.Reset()
 
482
 
 
483
 
 
484
def server_state_changed(state):
 
485
    """From the Avahi server example code"""
 
486
    if state == avahi.SERVER_COLLISION:
 
487
        logger.warning(u"Server name collision")
 
488
        remove_service()
 
489
    elif state == avahi.SERVER_RUNNING:
 
490
        add_service()
 
491
 
 
492
 
 
493
def entry_group_state_changed(state, error):
 
494
    """From the Avahi server example code"""
 
495
    global serviceName, server, rename_count
 
496
    
 
497
    logger.debug(u"state change: %i", state)
 
498
    
 
499
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
500
        logger.debug(u"Service established.")
 
501
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
502
        
 
503
        rename_count = rename_count - 1
 
504
        if rename_count > 0:
 
505
            name = server.GetAlternativeServiceName(name)
 
506
            logger.warning(u"Service name collision, "
 
507
                           u"changing name to '%s' ...", name)
 
508
            remove_service()
 
509
            add_service()
 
510
            
 
511
        else:
 
512
            logger.error(u"No suitable service name found after %i"
 
513
                         u" retries, exiting.", n_rename)
 
514
            killme(1)
 
515
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
516
        logger.error(u"Error in group state changed %s",
 
517
                     unicode(error))
 
518
        killme(1)
 
519
 
 
520
 
 
521
def if_nametoindex(interface):
 
522
    """Call the C function if_nametoindex()"""
 
523
    try:
 
524
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
525
        return libc.if_nametoindex(interface)
 
526
    except (OSError, AttributeError):
 
527
        if "struct" not in sys.modules:
 
528
            import struct
 
529
        if "fcntl" not in sys.modules:
 
530
            import fcntl
 
531
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
532
        s = socket.socket()
 
533
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
534
                            struct.pack("16s16x", interface))
 
535
        s.close()
 
536
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
537
        return interface_index
 
538
 
 
539
 
 
540
def daemon(nochdir, noclose):
1923
541
    """See daemon(3).  Standard BSD Unix function.
1924
 
    
1925
542
    This should really exist as os.daemon, but it doesn't (yet)."""
1926
543
    if os.fork():
1927
544
        sys.exit()
1928
545
    os.setsid()
1929
546
    if not nochdir:
1930
547
        os.chdir("/")
1931
 
    if os.fork():
1932
 
        sys.exit()
1933
548
    if not noclose:
1934
549
        # Close all standard open file descriptors
1935
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
550
        null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
1936
551
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1937
552
            raise OSError(errno.ENODEV,
1938
 
                          "%s not a character device"
1939
 
                          % os.path.devnull)
 
553
                          "/dev/null not a character device")
1940
554
        os.dup2(null, sys.stdin.fileno())
1941
555
        os.dup2(null, sys.stdout.fileno())
1942
556
        os.dup2(null, sys.stderr.fileno())
1944
558
            os.close(null)
1945
559
 
1946
560
 
1947
 
def main():
1948
 
    
1949
 
    ##################################################################
1950
 
    # Parsing of options, both command line and config file
1951
 
    
1952
 
    parser = argparse.ArgumentParser()
1953
 
    parser.add_argument("-v", "--version", action="version",
1954
 
                        version = "%%(prog)s %s" % version,
1955
 
                        help="show version number and exit")
1956
 
    parser.add_argument("-i", "--interface", metavar="IF",
1957
 
                        help="Bind to interface IF")
1958
 
    parser.add_argument("-a", "--address",
1959
 
                        help="Address to listen for requests on")
1960
 
    parser.add_argument("-p", "--port", type=int,
1961
 
                        help="Port number to receive requests on")
1962
 
    parser.add_argument("--check", action="store_true",
1963
 
                        help="Run self-test")
1964
 
    parser.add_argument("--debug", action="store_true",
1965
 
                        help="Debug mode; run in foreground and log"
1966
 
                        " to terminal")
1967
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
1968
 
                        help="Debug level for stdout output")
1969
 
    parser.add_argument("--priority", help="GnuTLS"
1970
 
                        " priority string (see GnuTLS documentation)")
1971
 
    parser.add_argument("--servicename",
1972
 
                        metavar="NAME", help="Zeroconf service name")
1973
 
    parser.add_argument("--configdir",
1974
 
                        default="/etc/mandos", metavar="DIR",
1975
 
                        help="Directory to search for configuration"
1976
 
                        " files")
1977
 
    parser.add_argument("--no-dbus", action="store_false",
1978
 
                        dest="use_dbus", help="Do not provide D-Bus"
1979
 
                        " system bus interface")
1980
 
    parser.add_argument("--no-ipv6", action="store_false",
1981
 
                        dest="use_ipv6", help="Do not use IPv6")
1982
 
    parser.add_argument("--no-restore", action="store_false",
1983
 
                        dest="restore", help="Do not restore stored"
1984
 
                        " state")
1985
 
    parser.add_argument("--statedir", metavar="DIR",
1986
 
                        help="Directory to save/restore state in")
1987
 
    
1988
 
    options = parser.parse_args()
 
561
def killme(status = 0):
 
562
    logger.debug("Stopping server with exit status %d", status)
 
563
    exitstatus = status
 
564
    if main_loop_started:
 
565
        main_loop.quit()
 
566
    else:
 
567
        sys.exit(status)
 
568
 
 
569
 
 
570
if __name__ == '__main__':
 
571
    exitstatus = 0
 
572
    main_loop_started = False
 
573
    parser = OptionParser()
 
574
    parser.add_option("-i", "--interface", type="string",
 
575
                      default=None, metavar="IF",
 
576
                      help="Bind to interface IF")
 
577
    parser.add_option("-p", "--port", type="int", default=None,
 
578
                      help="Port number to receive requests on")
 
579
    parser.add_option("--timeout", type="string", # Parsed later
 
580
                      default="1h",
 
581
                      help="Amount of downtime allowed for clients")
 
582
    parser.add_option("--interval", type="string", # Parsed later
 
583
                      default="5m",
 
584
                      help="How often to check that a client is up")
 
585
    parser.add_option("--check", action="store_true", default=False,
 
586
                      help="Run self-test")
 
587
    parser.add_option("--debug", action="store_true", default=False,
 
588
                      help="Debug mode")
 
589
    (options, args) = parser.parse_args()
1989
590
    
1990
591
    if options.check:
1991
592
        import doctest
1992
593
        doctest.testmod()
1993
594
        sys.exit()
1994
595
    
1995
 
    # Default values for config file for server-global settings
1996
 
    server_defaults = { "interface": "",
1997
 
                        "address": "",
1998
 
                        "port": "",
1999
 
                        "debug": "False",
2000
 
                        "priority":
2001
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
2002
 
                        "servicename": "Mandos",
2003
 
                        "use_dbus": "True",
2004
 
                        "use_ipv6": "True",
2005
 
                        "debuglevel": "",
2006
 
                        "restore": "True",
2007
 
                        "statedir": "/var/lib/mandos"
2008
 
                        }
2009
 
    
2010
 
    # Parse config file for server-global settings
2011
 
    server_config = configparser.SafeConfigParser(server_defaults)
2012
 
    del server_defaults
2013
 
    server_config.read(os.path.join(options.configdir,
2014
 
                                    "mandos.conf"))
2015
 
    # Convert the SafeConfigParser object to a dict
2016
 
    server_settings = server_config.defaults()
2017
 
    # Use the appropriate methods on the non-string config options
2018
 
    for option in ("debug", "use_dbus", "use_ipv6"):
2019
 
        server_settings[option] = server_config.getboolean("DEFAULT",
2020
 
                                                           option)
2021
 
    if server_settings["port"]:
2022
 
        server_settings["port"] = server_config.getint("DEFAULT",
2023
 
                                                       "port")
2024
 
    del server_config
2025
 
    
2026
 
    # Override the settings from the config file with command line
2027
 
    # options, if set.
2028
 
    for option in ("interface", "address", "port", "debug",
2029
 
                   "priority", "servicename", "configdir",
2030
 
                   "use_dbus", "use_ipv6", "debuglevel", "restore",
2031
 
                   "statedir"):
2032
 
        value = getattr(options, option)
2033
 
        if value is not None:
2034
 
            server_settings[option] = value
2035
 
    del options
2036
 
    # Force all strings to be unicode
2037
 
    for option in server_settings.keys():
2038
 
        if type(server_settings[option]) is str:
2039
 
            server_settings[option] = unicode(server_settings[option])
2040
 
    # Now we have our good server settings in "server_settings"
2041
 
    
2042
 
    ##################################################################
2043
 
    
2044
 
    # For convenience
2045
 
    debug = server_settings["debug"]
2046
 
    debuglevel = server_settings["debuglevel"]
2047
 
    use_dbus = server_settings["use_dbus"]
2048
 
    use_ipv6 = server_settings["use_ipv6"]
2049
 
    stored_state_path = os.path.join(server_settings["statedir"],
2050
 
                                     stored_state_file)
2051
 
    
2052
 
    if debug:
2053
 
        initlogger(logging.DEBUG)
2054
 
    else:
2055
 
        if not debuglevel:
2056
 
            initlogger()
2057
 
        else:
2058
 
            level = getattr(logging, debuglevel.upper())
2059
 
            initlogger(level)
2060
 
    
2061
 
    if server_settings["servicename"] != "Mandos":
2062
 
        syslogger.setFormatter(logging.Formatter
2063
 
                               ('Mandos (%s) [%%(process)d]:'
2064
 
                                ' %%(levelname)s: %%(message)s'
2065
 
                                % server_settings["servicename"]))
2066
 
    
2067
 
    # Parse config file with clients
2068
 
    client_defaults = { "timeout": "5m",
2069
 
                        "extended_timeout": "15m",
2070
 
                        "interval": "2m",
2071
 
                        "checker": "fping -q -- %%(host)s",
2072
 
                        "host": "",
2073
 
                        "approval_delay": "0s",
2074
 
                        "approval_duration": "1s",
2075
 
                        }
2076
 
    client_config = configparser.SafeConfigParser(client_defaults)
2077
 
    client_config.read(os.path.join(server_settings["configdir"],
2078
 
                                    "clients.conf"))
2079
 
    
2080
 
    global mandos_dbus_service
2081
 
    mandos_dbus_service = None
2082
 
    
2083
 
    tcp_server = MandosServer((server_settings["address"],
2084
 
                               server_settings["port"]),
2085
 
                              ClientHandler,
2086
 
                              interface=(server_settings["interface"]
2087
 
                                         or None),
2088
 
                              use_ipv6=use_ipv6,
2089
 
                              gnutls_priority=
2090
 
                              server_settings["priority"],
2091
 
                              use_dbus=use_dbus)
2092
 
    if not debug:
2093
 
        pidfilename = "/var/run/mandos.pid"
2094
 
        try:
2095
 
            pidfile = open(pidfilename, "w")
2096
 
        except IOError:
2097
 
            logger.error("Could not open file %r", pidfilename)
2098
 
    
2099
 
    try:
2100
 
        uid = pwd.getpwnam("_mandos").pw_uid
2101
 
        gid = pwd.getpwnam("_mandos").pw_gid
2102
 
    except KeyError:
2103
 
        try:
2104
 
            uid = pwd.getpwnam("mandos").pw_uid
2105
 
            gid = pwd.getpwnam("mandos").pw_gid
2106
 
        except KeyError:
2107
 
            try:
2108
 
                uid = pwd.getpwnam("nobody").pw_uid
2109
 
                gid = pwd.getpwnam("nobody").pw_gid
2110
 
            except KeyError:
2111
 
                uid = 65534
2112
 
                gid = 65534
2113
 
    try:
2114
 
        os.setgid(gid)
2115
 
        os.setuid(uid)
2116
 
    except OSError as error:
2117
 
        if error[0] != errno.EPERM:
2118
 
            raise error
2119
 
    
2120
 
    if debug:
2121
 
        # Enable all possible GnuTLS debugging
2122
 
        
2123
 
        # "Use a log level over 10 to enable all debugging options."
2124
 
        # - GnuTLS manual
2125
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
2126
 
        
2127
 
        @gnutls.library.types.gnutls_log_func
2128
 
        def debug_gnutls(level, string):
2129
 
            logger.debug("GnuTLS: %s", string[:-1])
2130
 
        
2131
 
        (gnutls.library.functions
2132
 
         .gnutls_global_set_log_function(debug_gnutls))
2133
 
        
2134
 
        # Redirect stdin so all checkers get /dev/null
2135
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
2136
 
        os.dup2(null, sys.stdin.fileno())
2137
 
        if null > 2:
2138
 
            os.close(null)
2139
 
    else:
2140
 
        # No console logging
2141
 
        logger.removeHandler(console)
2142
 
    
2143
 
    # Need to fork before connecting to D-Bus
2144
 
    if not debug:
2145
 
        # Close all input and output, do double fork, etc.
2146
 
        daemon()
2147
 
    
2148
 
    global main_loop
2149
 
    # From the Avahi example code
 
596
    # Parse the time arguments
 
597
    try:
 
598
        options.timeout = string_to_delta(options.timeout)
 
599
    except ValueError:
 
600
        parser.error("option --timeout: Unparseable time")
 
601
    try:
 
602
        options.interval = string_to_delta(options.interval)
 
603
    except ValueError:
 
604
        parser.error("option --interval: Unparseable time")
 
605
    
 
606
    # Parse config file
 
607
    defaults = { "checker": "fping -q -- %%(fqdn)s" }
 
608
    client_config = ConfigParser.SafeConfigParser(defaults)
 
609
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
 
610
    client_config.read("mandos-clients.conf")
 
611
    
 
612
    # From the Avahi server example code
2150
613
    DBusGMainLoop(set_as_default=True )
2151
614
    main_loop = gobject.MainLoop()
2152
615
    bus = dbus.SystemBus()
 
616
    server = dbus.Interface(
 
617
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
618
            avahi.DBUS_INTERFACE_SERVER )
2153
619
    # End of Avahi example code
2154
 
    if use_dbus:
2155
 
        try:
2156
 
            bus_name = dbus.service.BusName("se.recompile.Mandos",
2157
 
                                            bus, do_not_queue=True)
2158
 
            old_bus_name = (dbus.service.BusName
2159
 
                            ("se.bsnet.fukt.Mandos", bus,
2160
 
                             do_not_queue=True))
2161
 
        except dbus.exceptions.NameExistsException as e:
2162
 
            logger.error(unicode(e) + ", disabling D-Bus")
2163
 
            use_dbus = False
2164
 
            server_settings["use_dbus"] = False
2165
 
            tcp_server.use_dbus = False
2166
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
2167
 
    service = AvahiServiceToSyslog(name =
2168
 
                                   server_settings["servicename"],
2169
 
                                   servicetype = "_mandos._tcp",
2170
 
                                   protocol = protocol, bus = bus)
2171
 
    if server_settings["interface"]:
2172
 
        service.interface = (if_nametoindex
2173
 
                             (str(server_settings["interface"])))
2174
 
    
2175
 
    global multiprocessing_manager
2176
 
    multiprocessing_manager = multiprocessing.Manager()
2177
 
    
2178
 
    client_class = Client
2179
 
    if use_dbus:
2180
 
        client_class = functools.partial(ClientDBusTransitional,
2181
 
                                         bus = bus)
2182
 
    
2183
 
    special_settings = {
2184
 
        # Some settings need to be accessd by special methods;
2185
 
        # booleans need .getboolean(), etc.  Here is a list of them:
2186
 
        "approved_by_default":
2187
 
            lambda section:
2188
 
            client_config.getboolean(section, "approved_by_default"),
2189
 
        "enabled":
2190
 
            lambda section:
2191
 
            client_config.getboolean(section, "enabled"),
2192
 
        }
2193
 
    # Construct a new dict of client settings of this form:
2194
 
    # { client_name: {setting_name: value, ...}, ...}
2195
 
    # with exceptions for any special settings as defined above
2196
 
    client_settings = dict((clientname,
2197
 
                           dict((setting,
2198
 
                                 (value
2199
 
                                  if setting not in special_settings
2200
 
                                  else special_settings[setting]
2201
 
                                  (clientname)))
2202
 
                                for setting, value in
2203
 
                                client_config.items(clientname)))
2204
 
                          for clientname in client_config.sections())
2205
 
    
2206
 
    old_client_settings = {}
2207
 
    clients_data = []
2208
 
    
2209
 
    # Get client data and settings from last running state.
2210
 
    if server_settings["restore"]:
2211
 
        try:
2212
 
            with open(stored_state_path, "rb") as stored_state:
2213
 
                clients_data, old_client_settings = (pickle.load
2214
 
                                                     (stored_state))
2215
 
            os.remove(stored_state_path)
2216
 
        except IOError as e:
2217
 
            logger.warning("Could not load persistent state: {0}"
2218
 
                           .format(e))
2219
 
            if e.errno != errno.ENOENT:
2220
 
                raise
2221
 
    
2222
 
    with PGPEngine() as pgp:
2223
 
        for client in clients_data:
2224
 
            client_name = client["name"]
2225
 
            
2226
 
            # Decide which value to use after restoring saved state.
2227
 
            # We have three different values: Old config file,
2228
 
            # new config file, and saved state.
2229
 
            # New config value takes precedence if it differs from old
2230
 
            # config value, otherwise use saved state.
2231
 
            for name, value in client_settings[client_name].items():
2232
 
                try:
2233
 
                    # For each value in new config, check if it
2234
 
                    # differs from the old config value (Except for
2235
 
                    # the "secret" attribute)
2236
 
                    if (name != "secret" and
2237
 
                        value != old_client_settings[client_name]
2238
 
                        [name]):
2239
 
                        setattr(client, name, value)
2240
 
                except KeyError:
2241
 
                    pass
2242
 
            
2243
 
            # Clients who has passed its expire date can still be
2244
 
            # enabled if its last checker was sucessful.  Clients
2245
 
            # whose checker failed before we stored its state is
2246
 
            # assumed to have failed all checkers during downtime.
2247
 
            if client["enabled"]:
2248
 
                if client["expires"] <= (datetime.datetime
2249
 
                                         .utcnow()):
2250
 
                    # Client has expired
2251
 
                    if client["last_checker_status"] != 0:
2252
 
                        client["enabled"] = False
2253
 
                    else:
2254
 
                        client["expires"] = (datetime.datetime
2255
 
                                             .utcnow()
2256
 
                                             + client["timeout"])
2257
 
            
2258
 
            client["changedstate"] = (multiprocessing_manager
2259
 
                                      .Condition
2260
 
                                      (multiprocessing_manager
2261
 
                                       .Lock()))
2262
 
            if use_dbus:
2263
 
                new_client = (ClientDBusTransitional.__new__
2264
 
                              (ClientDBusTransitional))
2265
 
                tcp_server.clients[client_name] = new_client
2266
 
                new_client.bus = bus
2267
 
                for name, value in client.iteritems():
2268
 
                    setattr(new_client, name, value)
2269
 
                client_object_name = unicode(client_name).translate(
2270
 
                    {ord("."): ord("_"),
2271
 
                     ord("-"): ord("_")})
2272
 
                new_client.dbus_object_path = (dbus.ObjectPath
2273
 
                                               ("/clients/"
2274
 
                                                + client_object_name))
2275
 
                DBusObjectWithProperties.__init__(new_client,
2276
 
                                                  new_client.bus,
2277
 
                                                  new_client
2278
 
                                                  .dbus_object_path)
2279
 
            else:
2280
 
                tcp_server.clients[client_name] = (Client.__new__
2281
 
                                                   (Client))
2282
 
                for name, value in client.iteritems():
2283
 
                    setattr(tcp_server.clients[client_name],
2284
 
                            name, value)
2285
 
            
2286
 
            try:
2287
 
                tcp_server.clients[client_name].secret = (
2288
 
                    pgp.decrypt(tcp_server.clients[client_name]
2289
 
                                .encrypted_secret,
2290
 
                                client_settings[client_name]
2291
 
                                ["secret"]))
2292
 
            except PGPError:
2293
 
                # If decryption fails, we use secret from new settings
2294
 
                logger.debug("Failed to decrypt {0} old secret"
2295
 
                             .format(client_name))
2296
 
                tcp_server.clients[client_name].secret = (
2297
 
                    client_settings[client_name]["secret"])
2298
 
    
2299
 
    # Create/remove clients based on new changes made to config
2300
 
    for clientname in set(old_client_settings) - set(client_settings):
2301
 
        del tcp_server.clients[clientname]
2302
 
    for clientname in set(client_settings) - set(old_client_settings):
2303
 
        tcp_server.clients[clientname] = (client_class(name
2304
 
                                                       = clientname,
2305
 
                                                       config =
2306
 
                                                       client_settings
2307
 
                                                       [clientname]))
2308
 
    
2309
 
    if not tcp_server.clients:
2310
 
        logger.warning("No clients defined")
2311
 
        
 
620
    
 
621
    debug = options.debug
 
622
    
 
623
    if debug:
 
624
        console = logging.StreamHandler()
 
625
        # console.setLevel(logging.DEBUG)
 
626
        console.setFormatter(logging.Formatter\
 
627
                             ('%(levelname)s: %(message)s'))
 
628
        logger.addHandler(console)
 
629
        del console
 
630
    
 
631
    clients = Set()
 
632
    def remove_from_clients(client):
 
633
        clients.remove(client)
 
634
        if not clients:
 
635
            logger.debug(u"No clients left, exiting")
 
636
            killme()
 
637
    
 
638
    clients.update(Set(Client(name=section, options=options,
 
639
                              stop_hook = remove_from_clients,
 
640
                              **(dict(client_config\
 
641
                                      .items(section))))
 
642
                       for section in client_config.sections()))
 
643
    
2312
644
    if not debug:
2313
 
        try:
2314
 
            with pidfile:
2315
 
                pid = os.getpid()
2316
 
                pidfile.write(str(pid) + "\n".encode("utf-8"))
2317
 
            del pidfile
2318
 
        except IOError:
2319
 
            logger.error("Could not write to file %r with PID %d",
2320
 
                         pidfilename, pid)
2321
 
        except NameError:
2322
 
            # "pidfile" was never created
2323
 
            pass
2324
 
        del pidfilename
2325
 
        
2326
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
2327
 
    
2328
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
2329
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
2330
 
    
2331
 
    if use_dbus:
2332
 
        class MandosDBusService(dbus.service.Object):
2333
 
            """A D-Bus proxy object"""
2334
 
            def __init__(self):
2335
 
                dbus.service.Object.__init__(self, bus, "/")
2336
 
            _interface = "se.recompile.Mandos"
2337
 
            
2338
 
            @dbus.service.signal(_interface, signature="o")
2339
 
            def ClientAdded(self, objpath):
2340
 
                "D-Bus signal"
2341
 
                pass
2342
 
            
2343
 
            @dbus.service.signal(_interface, signature="ss")
2344
 
            def ClientNotFound(self, fingerprint, address):
2345
 
                "D-Bus signal"
2346
 
                pass
2347
 
            
2348
 
            @dbus.service.signal(_interface, signature="os")
2349
 
            def ClientRemoved(self, objpath, name):
2350
 
                "D-Bus signal"
2351
 
                pass
2352
 
            
2353
 
            @dbus.service.method(_interface, out_signature="ao")
2354
 
            def GetAllClients(self):
2355
 
                "D-Bus method"
2356
 
                return dbus.Array(c.dbus_object_path
2357
 
                                  for c in
2358
 
                                  tcp_server.clients.itervalues())
2359
 
            
2360
 
            @dbus.service.method(_interface,
2361
 
                                 out_signature="a{oa{sv}}")
2362
 
            def GetAllClientsWithProperties(self):
2363
 
                "D-Bus method"
2364
 
                return dbus.Dictionary(
2365
 
                    ((c.dbus_object_path, c.GetAll(""))
2366
 
                     for c in tcp_server.clients.itervalues()),
2367
 
                    signature="oa{sv}")
2368
 
            
2369
 
            @dbus.service.method(_interface, in_signature="o")
2370
 
            def RemoveClient(self, object_path):
2371
 
                "D-Bus method"
2372
 
                for c in tcp_server.clients.itervalues():
2373
 
                    if c.dbus_object_path == object_path:
2374
 
                        del tcp_server.clients[c.name]
2375
 
                        c.remove_from_connection()
2376
 
                        # Don't signal anything except ClientRemoved
2377
 
                        c.disable(quiet=True)
2378
 
                        # Emit D-Bus signal
2379
 
                        self.ClientRemoved(object_path, c.name)
2380
 
                        return
2381
 
                raise KeyError(object_path)
2382
 
            
2383
 
            del _interface
2384
 
        
2385
 
        class MandosDBusServiceTransitional(MandosDBusService):
2386
 
            __metaclass__ = AlternateDBusNamesMetaclass
2387
 
        mandos_dbus_service = MandosDBusServiceTransitional()
 
645
        daemon(False, False)
2388
646
    
2389
647
    def cleanup():
2390
648
        "Cleanup function; run on exit"
2391
 
        service.cleanup()
2392
 
        
2393
 
        multiprocessing.active_children()
2394
 
        if not (tcp_server.clients or client_settings):
2395
 
            return
2396
 
        
2397
 
        # Store client before exiting. Secrets are encrypted with key
2398
 
        # based on what config file has. If config file is
2399
 
        # removed/edited, old secret will thus be unrecovable.
2400
 
        clients = []
2401
 
        with PGPEngine() as pgp:
2402
 
            for client in tcp_server.clients.itervalues():
2403
 
                key = client_settings[client.name]["secret"]
2404
 
                client.encrypted_secret = pgp.encrypt(client.secret,
2405
 
                                                      key)
2406
 
                client_dict = {}
2407
 
                
2408
 
                # A list of attributes that will not be stored when
2409
 
                # shutting down.
2410
 
                exclude = set(("bus", "changedstate", "secret"))
2411
 
                for name, typ in (inspect.getmembers
2412
 
                                  (dbus.service.Object)):
2413
 
                    exclude.add(name)
2414
 
                
2415
 
                client_dict["encrypted_secret"] = (client
2416
 
                                                   .encrypted_secret)
2417
 
                for attr in client.client_structure:
2418
 
                    if attr not in exclude:
2419
 
                        client_dict[attr] = getattr(client, attr)
2420
 
                
2421
 
                clients.append(client_dict)
2422
 
                del client_settings[client.name]["secret"]
2423
 
        
2424
 
        try:
2425
 
            with os.fdopen(os.open(stored_state_path,
2426
 
                                   os.O_CREAT|os.O_WRONLY|os.O_TRUNC,
2427
 
                                   0600), "wb") as stored_state:
2428
 
                pickle.dump((clients, client_settings), stored_state)
2429
 
        except (IOError, OSError) as e:
2430
 
            logger.warning("Could not save persistent state: {0}"
2431
 
                           .format(e))
2432
 
            if e.errno not in (errno.ENOENT, errno.EACCES):
2433
 
                raise
2434
 
        
2435
 
        # Delete all clients, and settings from config
2436
 
        while tcp_server.clients:
2437
 
            name, client = tcp_server.clients.popitem()
2438
 
            if use_dbus:
2439
 
                client.remove_from_connection()
2440
 
            # Don't signal anything except ClientRemoved
2441
 
            client.disable(quiet=True)
2442
 
            if use_dbus:
2443
 
                # Emit D-Bus signal
2444
 
                mandos_dbus_service.ClientRemoved(client
2445
 
                                                  .dbus_object_path,
2446
 
                                                  client.name)
2447
 
        client_settings.clear()
 
649
        global group
 
650
        # From the Avahi server example code
 
651
        if not group is None:
 
652
            group.Free()
 
653
            group = None
 
654
        # End of Avahi example code
 
655
        
 
656
        for client in clients:
 
657
            client.stop_hook = None
 
658
            client.stop()
2448
659
    
2449
660
    atexit.register(cleanup)
2450
661
    
2451
 
    for client in tcp_server.clients.itervalues():
2452
 
        if use_dbus:
2453
 
            # Emit D-Bus signal
2454
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
2455
 
        # Need to initiate checking of clients
2456
 
        if client.enabled:
2457
 
            client.init_checker()
2458
 
    
2459
 
    tcp_server.enable()
2460
 
    tcp_server.server_activate()
2461
 
    
2462
 
    # Find out what port we got
2463
 
    service.port = tcp_server.socket.getsockname()[1]
2464
 
    if use_ipv6:
2465
 
        logger.info("Now listening on address %r, port %d,"
2466
 
                    " flowinfo %d, scope_id %d"
2467
 
                    % tcp_server.socket.getsockname())
2468
 
    else:                       # IPv4
2469
 
        logger.info("Now listening on address %r, port %d"
2470
 
                    % tcp_server.socket.getsockname())
2471
 
    
2472
 
    #service.interface = tcp_server.socket.getsockname()[3]
2473
 
    
2474
 
    try:
2475
 
        # From the Avahi example code
2476
 
        try:
2477
 
            service.activate()
2478
 
        except dbus.exceptions.DBusException as error:
2479
 
            logger.critical("DBusException: %s", error)
2480
 
            cleanup()
2481
 
            sys.exit(1)
2482
 
        # End of Avahi example code
2483
 
        
2484
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2485
 
                             lambda *args, **kwargs:
2486
 
                             (tcp_server.handle_request
2487
 
                              (*args[2:], **kwargs) or True))
2488
 
        
2489
 
        logger.debug("Starting main loop")
 
662
    if not debug:
 
663
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
664
    signal.signal(signal.SIGHUP, lambda signum, frame: killme())
 
665
    signal.signal(signal.SIGTERM, lambda signum, frame: killme())
 
666
    
 
667
    for client in clients:
 
668
        client.start()
 
669
    
 
670
    tcp_server = IPv6_TCPServer((None, options.port),
 
671
                                tcp_handler,
 
672
                                options=options,
 
673
                                clients=clients)
 
674
    # Find out what random port we got
 
675
    servicePort = tcp_server.socket.getsockname()[1]
 
676
    logger.debug(u"Now listening on port %d", servicePort)
 
677
    
 
678
    if options.interface is not None:
 
679
        serviceInterface = if_nametoindex(options.interface)
 
680
    
 
681
    # From the Avahi server example code
 
682
    server.connect_to_signal("StateChanged", server_state_changed)
 
683
    try:
 
684
        server_state_changed(server.GetState())
 
685
    except dbus.exceptions.DBusException, error:
 
686
        logger.critical(u"DBusException: %s", error)
 
687
        killme(1)
 
688
    # End of Avahi example code
 
689
    
 
690
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
691
                         lambda *args, **kwargs:
 
692
                         tcp_server.handle_request(*args[2:],
 
693
                                                   **kwargs) or True)
 
694
    try:
 
695
        main_loop_started = True
2490
696
        main_loop.run()
2491
 
    except AvahiError as error:
2492
 
        logger.critical("AvahiError: %s", error)
2493
 
        cleanup()
2494
 
        sys.exit(1)
2495
697
    except KeyboardInterrupt:
2496
698
        if debug:
2497
 
            print("", file=sys.stderr)
2498
 
        logger.debug("Server received KeyboardInterrupt")
2499
 
    logger.debug("Server exiting")
2500
 
    # Must run before the D-Bus bus name gets deregistered
2501
 
    cleanup()
2502
 
 
2503
 
 
2504
 
if __name__ == '__main__':
2505
 
    main()
 
699
            print
 
700
    
 
701
    sys.exit(exitstatus)