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  • Committer: Björn Påhlsson
  • Date: 2008-07-20 02:52:20 UTC
  • Revision ID: belorn@braxen-20080720025220-r5u0388uy9iu23h6
Added following support:
Pluginbased client handler
rewritten Mandos client
       Avahi instead of udp server discovery
       openpgp encrypted key support
Passprompt stand alone application for direct console input
Added logging for Mandos server

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#!/usr/bin/python
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
 
2
 
 
3
from __future__ import division
 
4
 
 
5
import SocketServer
38
6
import socket
39
 
import argparse
 
7
import select
 
8
from optparse import OptionParser
40
9
import datetime
41
10
import errno
42
11
import gnutls.crypto
45
14
import gnutls.library.functions
46
15
import gnutls.library.constants
47
16
import gnutls.library.types
48
 
import ConfigParser as configparser
 
17
import ConfigParser
49
18
import sys
50
19
import re
51
20
import os
52
21
import signal
 
22
from sets import Set
53
23
import subprocess
54
 
import atexit
55
 
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
24
 
67
25
import dbus
68
 
import dbus.service
69
26
import gobject
70
27
import avahi
71
28
from dbus.mainloop.glib import DBusGMainLoop
72
29
import ctypes
73
 
import ctypes.util
74
 
import xml.dom.minidom
75
 
import inspect
76
 
 
77
 
try:
78
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
79
 
except AttributeError:
80
 
    try:
81
 
        from IN import SO_BINDTODEVICE
82
 
    except ImportError:
83
 
        SO_BINDTODEVICE = None
84
 
 
85
 
 
86
 
version = "1.4.0"
87
 
 
88
 
#logger = logging.getLogger('mandos')
 
30
 
 
31
import logging
 
32
import logging.handlers
 
33
 
 
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
 
35
 
89
36
logger = logging.Logger('mandos')
90
 
syslogger = (logging.handlers.SysLogHandler
91
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
92
 
              address = str("/dev/log")))
93
 
syslogger.setFormatter(logging.Formatter
94
 
                       ('Mandos [%(process)d]: %(levelname)s:'
95
 
                        ' %(message)s'))
96
 
logger.addHandler(syslogger)
97
 
 
98
 
console = logging.StreamHandler()
99
 
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
100
 
                                       ' %(levelname)s:'
101
 
                                       ' %(message)s'))
102
 
logger.addHandler(console)
103
 
 
104
 
class AvahiError(Exception):
105
 
    def __init__(self, value, *args, **kwargs):
106
 
        self.value = value
107
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
108
 
    def __unicode__(self):
109
 
        return unicode(repr(self.value))
110
 
 
111
 
class AvahiServiceError(AvahiError):
112
 
    pass
113
 
 
114
 
class AvahiGroupError(AvahiError):
115
 
    pass
116
 
 
117
 
 
118
 
class AvahiService(object):
119
 
    """An Avahi (Zeroconf) service.
120
 
    
121
 
    Attributes:
122
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
123
 
               Used to optionally bind to the specified interface.
124
 
    name: string; Example: 'Mandos'
125
 
    type: string; Example: '_mandos._tcp'.
126
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
127
 
    port: integer; what port to announce
128
 
    TXT: list of strings; TXT record for the service
129
 
    domain: string; Domain to publish on, default to .local if empty.
130
 
    host: string; Host to publish records for, default is localhost
131
 
    max_renames: integer; maximum number of renames
132
 
    rename_count: integer; counter so we only rename after collisions
133
 
                  a sensible number of times
134
 
    group: D-Bus Entry Group
135
 
    server: D-Bus Server
136
 
    bus: dbus.SystemBus()
137
 
    """
138
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
139
 
                 servicetype = None, port = None, TXT = None,
140
 
                 domain = "", host = "", max_renames = 32768,
141
 
                 protocol = avahi.PROTO_UNSPEC, bus = None):
142
 
        self.interface = interface
143
 
        self.name = name
144
 
        self.type = servicetype
145
 
        self.port = port
146
 
        self.TXT = TXT if TXT is not None else []
147
 
        self.domain = domain
148
 
        self.host = host
149
 
        self.rename_count = 0
150
 
        self.max_renames = max_renames
151
 
        self.protocol = protocol
152
 
        self.group = None       # our entry group
153
 
        self.server = None
154
 
        self.bus = bus
155
 
        self.entry_group_state_changed_match = None
156
 
    def rename(self):
157
 
        """Derived from the Avahi example code"""
158
 
        if self.rename_count >= self.max_renames:
159
 
            logger.critical("No suitable Zeroconf service name found"
160
 
                            " after %i retries, exiting.",
161
 
                            self.rename_count)
162
 
            raise AvahiServiceError("Too many renames")
163
 
        self.name = unicode(self.server
164
 
                            .GetAlternativeServiceName(self.name))
165
 
        logger.info("Changing Zeroconf service name to %r ...",
166
 
                    self.name)
167
 
        syslogger.setFormatter(logging.Formatter
168
 
                               ('Mandos (%s) [%%(process)d]:'
169
 
                                ' %%(levelname)s: %%(message)s'
170
 
                                % self.name))
171
 
        self.remove()
172
 
        try:
173
 
            self.add()
174
 
        except dbus.exceptions.DBusException as error:
175
 
            logger.critical("DBusException: %s", error)
176
 
            self.cleanup()
177
 
            os._exit(1)
178
 
        self.rename_count += 1
179
 
    def remove(self):
180
 
        """Derived from the Avahi example code"""
181
 
        if self.entry_group_state_changed_match is not None:
182
 
            self.entry_group_state_changed_match.remove()
183
 
            self.entry_group_state_changed_match = None
184
 
        if self.group is not None:
185
 
            self.group.Reset()
186
 
    def add(self):
187
 
        """Derived from the Avahi example code"""
188
 
        self.remove()
189
 
        if self.group is None:
190
 
            self.group = dbus.Interface(
191
 
                self.bus.get_object(avahi.DBUS_NAME,
192
 
                                    self.server.EntryGroupNew()),
193
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
194
 
        self.entry_group_state_changed_match = (
195
 
            self.group.connect_to_signal(
196
 
                'StateChanged', self .entry_group_state_changed))
197
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
198
 
                     self.name, self.type)
199
 
        self.group.AddService(
200
 
            self.interface,
201
 
            self.protocol,
202
 
            dbus.UInt32(0),     # flags
203
 
            self.name, self.type,
204
 
            self.domain, self.host,
205
 
            dbus.UInt16(self.port),
206
 
            avahi.string_array_to_txt_array(self.TXT))
207
 
        self.group.Commit()
208
 
    def entry_group_state_changed(self, state, error):
209
 
        """Derived from the Avahi example code"""
210
 
        logger.debug("Avahi entry group state change: %i", state)
211
 
        
212
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
213
 
            logger.debug("Zeroconf service established.")
214
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
215
 
            logger.info("Zeroconf service name collision.")
216
 
            self.rename()
217
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
218
 
            logger.critical("Avahi: Error in group state changed %s",
219
 
                            unicode(error))
220
 
            raise AvahiGroupError("State changed: %s"
221
 
                                  % unicode(error))
222
 
    def cleanup(self):
223
 
        """Derived from the Avahi example code"""
224
 
        if self.group is not None:
225
 
            try:
226
 
                self.group.Free()
227
 
            except (dbus.exceptions.UnknownMethodException,
228
 
                    dbus.exceptions.DBusException) as e:
229
 
                pass
230
 
            self.group = None
231
 
        self.remove()
232
 
    def server_state_changed(self, state, error=None):
233
 
        """Derived from the Avahi example code"""
234
 
        logger.debug("Avahi server state change: %i", state)
235
 
        bad_states = { avahi.SERVER_INVALID:
236
 
                           "Zeroconf server invalid",
237
 
                       avahi.SERVER_REGISTERING: None,
238
 
                       avahi.SERVER_COLLISION:
239
 
                           "Zeroconf server name collision",
240
 
                       avahi.SERVER_FAILURE:
241
 
                           "Zeroconf server failure" }
242
 
        if state in bad_states:
243
 
            if bad_states[state] is not None:
244
 
                if error is None:
245
 
                    logger.error(bad_states[state])
246
 
                else:
247
 
                    logger.error(bad_states[state] + ": %r", error)
248
 
            self.cleanup()
249
 
        elif state == avahi.SERVER_RUNNING:
250
 
            self.add()
251
 
        else:
252
 
            if error is None:
253
 
                logger.debug("Unknown state: %r", state)
254
 
            else:
255
 
                logger.debug("Unknown state: %r: %r", state, error)
256
 
    def activate(self):
257
 
        """Derived from the Avahi example code"""
258
 
        if self.server is None:
259
 
            self.server = dbus.Interface(
260
 
                self.bus.get_object(avahi.DBUS_NAME,
261
 
                                    avahi.DBUS_PATH_SERVER,
262
 
                                    follow_name_owner_changes=True),
263
 
                avahi.DBUS_INTERFACE_SERVER)
264
 
        self.server.connect_to_signal("StateChanged",
265
 
                                 self.server_state_changed)
266
 
        self.server_state_changed(self.server.GetState())
267
 
 
268
 
 
269
 
def _timedelta_to_milliseconds(td):
270
 
    "Convert a datetime.timedelta() to milliseconds"
271
 
    return ((td.days * 24 * 60 * 60 * 1000)
272
 
            + (td.seconds * 1000)
273
 
            + (td.microseconds // 1000))
274
 
        
 
37
logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))
 
38
 
 
39
# This variable is used to optionally bind to a specified interface.
 
40
# It is a global variable to fit in with the other variables from the
 
41
# Avahi server example code.
 
42
serviceInterface = avahi.IF_UNSPEC
 
43
# From the Avahi server example code:
 
44
serviceName = "Mandos"
 
45
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
46
servicePort = None                      # Not known at startup
 
47
serviceTXT = []                         # TXT record for the service
 
48
domain = ""                  # Domain to publish on, default to .local
 
49
host = ""          # Host to publish records for, default to localhost
 
50
group = None #our entry group
 
51
rename_count = 12       # Counter so we only rename after collisions a
 
52
                        # sensible number of times
 
53
# End of Avahi example code
 
54
 
 
55
 
275
56
class Client(object):
276
57
    """A representation of a client host served by this server.
277
 
    
278
58
    Attributes:
279
 
    _approved:   bool(); 'None' if not yet approved/disapproved
280
 
    approval_delay: datetime.timedelta(); Time to wait for approval
281
 
    approval_duration: datetime.timedelta(); Duration of one approval
282
 
    checker:    subprocess.Popen(); a running checker process used
283
 
                                    to see if the client lives.
284
 
                                    'None' if no process is running.
285
 
    checker_callback_tag: a gobject event source tag, or None
286
 
    checker_command: string; External command which is run to check
287
 
                     if client lives.  %() expansions are done at
 
59
    name:      string; from the config file, used in log messages
 
60
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
61
                 uniquely identify the client
 
62
    secret:    bytestring; sent verbatim (over TLS) to client
 
63
    fqdn:      string (FQDN); available for use by the checker command
 
64
    created:   datetime.datetime()
 
65
    last_seen: datetime.datetime() or None if not yet seen
 
66
    timeout:   datetime.timedelta(); How long from last_seen until
 
67
                                     this client is invalid
 
68
    interval:  datetime.timedelta(); How often to start a new checker
 
69
    stop_hook: If set, called by stop() as stop_hook(self)
 
70
    checker:   subprocess.Popen(); a running checker process used
 
71
                                   to see if the client lives.
 
72
                                   Is None if no process is running.
 
73
    checker_initiator_tag: a gobject event source tag, or None
 
74
    stop_initiator_tag:    - '' -
 
75
    checker_callback_tag:  - '' -
 
76
    checker_command: string; External command which is run to check if
 
77
                     client lives.  %()s expansions are done at
288
78
                     runtime with vars(self) as dict, so that for
289
79
                     instance %(name)s can be used in the command.
290
 
    checker_initiator_tag: a gobject event source tag, or None
291
 
    created:    datetime.datetime(); (UTC) object creation
292
 
    current_checker_command: string; current running checker_command
293
 
    disable_hook:  If set, called by disable() as disable_hook(self)
294
 
    disable_initiator_tag: a gobject event source tag, or None
295
 
    enabled:    bool()
296
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
297
 
                 uniquely identify the client
298
 
    host:       string; available for use by the checker command
299
 
    interval:   datetime.timedelta(); How often to start a new checker
300
 
    last_approval_request: datetime.datetime(); (UTC) or None
301
 
    last_checked_ok: datetime.datetime(); (UTC) or None
302
 
    last_enabled: datetime.datetime(); (UTC)
303
 
    name:       string; from the config file, used in log messages and
304
 
                        D-Bus identifiers
305
 
    secret:     bytestring; sent verbatim (over TLS) to client
306
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
307
 
                                      until this client is disabled
308
 
    extended_timeout:   extra long timeout when password has been sent
309
 
    runtime_expansions: Allowed attributes for runtime expansion.
310
 
    expires:    datetime.datetime(); time (UTC) when a client will be
311
 
                disabled, or None
 
80
    Private attibutes:
 
81
    _timeout: Real variable for 'timeout'
 
82
    _interval: Real variable for 'interval'
 
83
    _timeout_milliseconds: Used by gobject.timeout_add()
 
84
    _interval_milliseconds: - '' -
312
85
    """
313
 
    
314
 
    runtime_expansions = ("approval_delay", "approval_duration",
315
 
                          "created", "enabled", "fingerprint",
316
 
                          "host", "interval", "last_checked_ok",
317
 
                          "last_enabled", "name", "timeout")
318
 
    
319
 
    def timeout_milliseconds(self):
320
 
        "Return the 'timeout' attribute in milliseconds"
321
 
        return _timedelta_to_milliseconds(self.timeout)
322
 
    
323
 
    def extended_timeout_milliseconds(self):
324
 
        "Return the 'extended_timeout' attribute in milliseconds"
325
 
        return _timedelta_to_milliseconds(self.extended_timeout)
326
 
    
327
 
    def interval_milliseconds(self):
328
 
        "Return the 'interval' attribute in milliseconds"
329
 
        return _timedelta_to_milliseconds(self.interval)
330
 
    
331
 
    def approval_delay_milliseconds(self):
332
 
        return _timedelta_to_milliseconds(self.approval_delay)
333
 
    
334
 
    def __init__(self, name = None, disable_hook=None, config=None):
335
 
        """Note: the 'checker' key in 'config' sets the
336
 
        'checker_command' attribute and *not* the 'checker'
337
 
        attribute."""
 
86
    def _set_timeout(self, timeout):
 
87
        "Setter function for 'timeout' attribute"
 
88
        self._timeout = timeout
 
89
        self._timeout_milliseconds = ((self.timeout.days
 
90
                                       * 24 * 60 * 60 * 1000)
 
91
                                      + (self.timeout.seconds * 1000)
 
92
                                      + (self.timeout.microseconds
 
93
                                         // 1000))
 
94
    timeout = property(lambda self: self._timeout,
 
95
                       _set_timeout)
 
96
    del _set_timeout
 
97
    def _set_interval(self, interval):
 
98
        "Setter function for 'interval' attribute"
 
99
        self._interval = interval
 
100
        self._interval_milliseconds = ((self.interval.days
 
101
                                        * 24 * 60 * 60 * 1000)
 
102
                                       + (self.interval.seconds
 
103
                                          * 1000)
 
104
                                       + (self.interval.microseconds
 
105
                                          // 1000))
 
106
    interval = property(lambda self: self._interval,
 
107
                        _set_interval)
 
108
    del _set_interval
 
109
    def __init__(self, name=None, options=None, stop_hook=None,
 
110
                 fingerprint=None, secret=None, secfile=None, fqdn=None,
 
111
                 timeout=None, interval=-1, checker=None):
338
112
        self.name = name
339
 
        if config is None:
340
 
            config = {}
341
 
        logger.debug("Creating client %r", self.name)
342
 
        # Uppercase and remove spaces from fingerprint for later
343
 
        # comparison purposes with return value from the fingerprint()
344
 
        # function
345
 
        self.fingerprint = (config["fingerprint"].upper()
346
 
                            .replace(" ", ""))
347
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
348
 
        if "secret" in config:
349
 
            self.secret = config["secret"].decode("base64")
350
 
        elif "secfile" in config:
351
 
            with open(os.path.expanduser(os.path.expandvars
352
 
                                         (config["secfile"])),
353
 
                      "rb") as secfile:
354
 
                self.secret = secfile.read()
355
 
        else:
356
 
            raise TypeError("No secret or secfile for client %s"
357
 
                            % self.name)
358
 
        self.host = config.get("host", "")
359
 
        self.created = datetime.datetime.utcnow()
360
 
        self.enabled = False
361
 
        self.last_approval_request = None
362
 
        self.last_enabled = None
363
 
        self.last_checked_ok = None
364
 
        self.timeout = string_to_delta(config["timeout"])
365
 
        self.extended_timeout = string_to_delta(config
366
 
                                                ["extended_timeout"])
367
 
        self.interval = string_to_delta(config["interval"])
368
 
        self.disable_hook = disable_hook
 
113
        # Uppercase and remove spaces from fingerprint
 
114
        # for later comparison purposes with return value of
 
115
        # the fingerprint() function
 
116
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
117
        if secret:
 
118
            self.secret = secret.decode(u"base64")
 
119
        elif secfile:
 
120
            sf = open(secfile)
 
121
            self.secret = sf.read()
 
122
            sf.close()
 
123
        else:
 
124
            raise RuntimeError(u"No secret or secfile for client %s"
 
125
                               % self.name)
 
126
        self.fqdn = fqdn                # string
 
127
        self.created = datetime.datetime.now()
 
128
        self.last_seen = None
 
129
        if timeout is None:
 
130
            timeout = options.timeout
 
131
        self.timeout = timeout
 
132
        if interval == -1:
 
133
            interval = options.interval
 
134
        else:
 
135
            interval = string_to_delta(interval)
 
136
        self.interval = interval
 
137
        self.stop_hook = stop_hook
369
138
        self.checker = None
370
139
        self.checker_initiator_tag = None
371
 
        self.disable_initiator_tag = None
372
 
        self.expires = None
 
140
        self.stop_initiator_tag = None
373
141
        self.checker_callback_tag = None
374
 
        self.checker_command = config["checker"]
375
 
        self.current_checker_command = None
376
 
        self.last_connect = None
377
 
        self._approved = None
378
 
        self.approved_by_default = config.get("approved_by_default",
379
 
                                              True)
380
 
        self.approvals_pending = 0
381
 
        self.approval_delay = string_to_delta(
382
 
            config["approval_delay"])
383
 
        self.approval_duration = string_to_delta(
384
 
            config["approval_duration"])
385
 
        self.changedstate = (multiprocessing_manager
386
 
                             .Condition(multiprocessing_manager
387
 
                                        .Lock()))
388
 
    
389
 
    def send_changedstate(self):
390
 
        self.changedstate.acquire()
391
 
        self.changedstate.notify_all()
392
 
        self.changedstate.release()
393
 
    
394
 
    def enable(self):
395
 
        """Start this client's checker and timeout hooks"""
396
 
        if getattr(self, "enabled", False):
397
 
            # Already enabled
398
 
            return
399
 
        self.send_changedstate()
 
142
        self.check_command = checker
 
143
    def start(self):
 
144
        """Start this clients checker and timeout hooks"""
400
145
        # Schedule a new checker to be started an 'interval' from now,
401
146
        # and every interval from then on.
402
 
        self.checker_initiator_tag = (gobject.timeout_add
403
 
                                      (self.interval_milliseconds(),
404
 
                                       self.start_checker))
405
 
        # Schedule a disable() when 'timeout' has passed
406
 
        self.expires = datetime.datetime.utcnow() + self.timeout
407
 
        self.disable_initiator_tag = (gobject.timeout_add
408
 
                                   (self.timeout_milliseconds(),
409
 
                                    self.disable))
410
 
        self.enabled = True
411
 
        self.last_enabled = datetime.datetime.utcnow()
 
147
        self.checker_initiator_tag = gobject.timeout_add\
 
148
                                     (self._interval_milliseconds,
 
149
                                      self.start_checker)
412
150
        # Also start a new checker *right now*.
413
151
        self.start_checker()
414
 
    
415
 
    def disable(self, quiet=True):
416
 
        """Disable this client."""
417
 
        if not getattr(self, "enabled", False):
418
 
            return False
419
 
        if not quiet:
420
 
            self.send_changedstate()
421
 
        if not quiet:
422
 
            logger.info("Disabling client %s", self.name)
423
 
        if getattr(self, "disable_initiator_tag", False):
424
 
            gobject.source_remove(self.disable_initiator_tag)
425
 
            self.disable_initiator_tag = None
426
 
        self.expires = None
427
 
        if getattr(self, "checker_initiator_tag", False):
 
152
        # Schedule a stop() when 'timeout' has passed
 
153
        self.stop_initiator_tag = gobject.timeout_add\
 
154
                                  (self._timeout_milliseconds,
 
155
                                   self.stop)
 
156
    def stop(self):
 
157
        """Stop this client.
 
158
        The possibility that this client might be restarted is left
 
159
        open, but not currently used."""
 
160
        logger.debug(u"Stopping client %s", self.name)
 
161
        self.secret = None
 
162
        if self.stop_initiator_tag:
 
163
            gobject.source_remove(self.stop_initiator_tag)
 
164
            self.stop_initiator_tag = None
 
165
        if self.checker_initiator_tag:
428
166
            gobject.source_remove(self.checker_initiator_tag)
429
167
            self.checker_initiator_tag = None
430
168
        self.stop_checker()
431
 
        if self.disable_hook:
432
 
            self.disable_hook(self)
433
 
        self.enabled = False
 
169
        if self.stop_hook:
 
170
            self.stop_hook(self)
434
171
        # Do not run this again if called by a gobject.timeout_add
435
172
        return False
436
 
    
437
173
    def __del__(self):
438
 
        self.disable_hook = None
439
 
        self.disable()
440
 
    
441
 
    def checker_callback(self, pid, condition, command):
 
174
        # Some code duplication here and in stop()
 
175
        if hasattr(self, "stop_initiator_tag") \
 
176
               and self.stop_initiator_tag:
 
177
            gobject.source_remove(self.stop_initiator_tag)
 
178
            self.stop_initiator_tag = None
 
179
        if hasattr(self, "checker_initiator_tag") \
 
180
               and self.checker_initiator_tag:
 
181
            gobject.source_remove(self.checker_initiator_tag)
 
182
            self.checker_initiator_tag = None
 
183
        self.stop_checker()
 
184
    def checker_callback(self, pid, condition):
442
185
        """The checker has completed, so take appropriate actions."""
443
 
        self.checker_callback_tag = None
444
 
        self.checker = None
445
 
        if os.WIFEXITED(condition):
446
 
            exitstatus = os.WEXITSTATUS(condition)
447
 
            if exitstatus == 0:
448
 
                logger.info("Checker for %(name)s succeeded",
449
 
                            vars(self))
450
 
                self.checked_ok()
451
 
            else:
452
 
                logger.info("Checker for %(name)s failed",
453
 
                            vars(self))
454
 
        else:
455
 
            logger.warning("Checker for %(name)s crashed?",
 
186
        now = datetime.datetime.now()
 
187
        if os.WIFEXITED(condition) \
 
188
               and (os.WEXITSTATUS(condition) == 0):
 
189
            logger.debug(u"Checker for %(name)s succeeded",
 
190
                         vars(self))
 
191
            self.last_seen = now
 
192
            gobject.source_remove(self.stop_initiator_tag)
 
193
            self.stop_initiator_tag = gobject.timeout_add\
 
194
                                      (self._timeout_milliseconds,
 
195
                                       self.stop)
 
196
        if not os.WIFEXITED(condition):
 
197
            logger.warning(u"Checker for %(name)s crashed?",
456
198
                           vars(self))
457
 
    
458
 
    def checked_ok(self, timeout=None):
459
 
        """Bump up the timeout for this client.
460
 
        
461
 
        This should only be called when the client has been seen,
462
 
        alive and well.
463
 
        """
464
 
        if timeout is None:
465
 
            timeout = self.timeout
466
 
        self.last_checked_ok = datetime.datetime.utcnow()
467
 
        gobject.source_remove(self.disable_initiator_tag)
468
 
        self.disable_initiator_tag = (gobject.timeout_add
469
 
                                      (_timedelta_to_milliseconds
470
 
                                       (timeout), self.disable))
471
 
        self.expires = datetime.datetime.utcnow() + timeout
472
 
    
473
 
    def need_approval(self):
474
 
        self.last_approval_request = datetime.datetime.utcnow()
475
 
    
 
199
        else:
 
200
            logger.debug(u"Checker for %(name)s failed",
 
201
                         vars(self))
 
202
            self.checker = None
 
203
        self.checker_callback_tag = None
476
204
    def start_checker(self):
477
205
        """Start a new checker subprocess if one is not running.
478
 
        
479
206
        If a checker already exists, leave it running and do
480
207
        nothing."""
481
 
        # The reason for not killing a running checker is that if we
482
 
        # did that, then if a checker (for some reason) started
483
 
        # running slowly and taking more than 'interval' time, the
484
 
        # client would inevitably timeout, since no checker would get
485
 
        # a chance to run to completion.  If we instead leave running
486
 
        # checkers alone, the checker would have to take more time
487
 
        # than 'timeout' for the client to be disabled, which is as it
488
 
        # should be.
489
 
        
490
 
        # If a checker exists, make sure it is not a zombie
491
 
        try:
492
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
493
 
        except (AttributeError, OSError) as error:
494
 
            if (isinstance(error, OSError)
495
 
                and error.errno != errno.ECHILD):
496
 
                raise error
497
 
        else:
498
 
            if pid:
499
 
                logger.warning("Checker was a zombie")
500
 
                gobject.source_remove(self.checker_callback_tag)
501
 
                self.checker_callback(pid, status,
502
 
                                      self.current_checker_command)
503
 
        # Start a new checker if needed
504
208
        if self.checker is None:
 
209
            logger.debug(u"Starting checker for %s",
 
210
                         self.name)
505
211
            try:
506
 
                # In case checker_command has exactly one % operator
507
 
                command = self.checker_command % self.host
 
212
                command = self.check_command % self.fqdn
508
213
            except TypeError:
509
 
                # Escape attributes for the shell
510
 
                escaped_attrs = dict(
511
 
                    (attr,
512
 
                     re.escape(unicode(str(getattr(self, attr, "")),
513
 
                                       errors=
514
 
                                       'replace')))
515
 
                    for attr in
516
 
                    self.runtime_expansions)
517
 
                
 
214
                escaped_attrs = dict((key, re.escape(str(val)))
 
215
                                     for key, val in
 
216
                                     vars(self).iteritems())
518
217
                try:
519
 
                    command = self.checker_command % escaped_attrs
520
 
                except TypeError as error:
521
 
                    logger.error('Could not format string "%s":'
522
 
                                 ' %s', self.checker_command, error)
 
218
                    command = self.check_command % escaped_attrs
 
219
                except TypeError, error:
 
220
                    logger.critical(u'Could not format string "%s": %s',
 
221
                                    self.check_command, error)
523
222
                    return True # Try again later
524
 
            self.current_checker_command = command
525
223
            try:
526
 
                logger.info("Starting checker %r for %s",
527
 
                            command, self.name)
528
 
                # We don't need to redirect stdout and stderr, since
529
 
                # in normal mode, that is already done by daemon(),
530
 
                # and in debug mode we don't want to.  (Stdin is
531
 
                # always replaced by /dev/null.)
532
 
                self.checker = subprocess.Popen(command,
533
 
                                                close_fds=True,
534
 
                                                shell=True, cwd="/")
535
 
                self.checker_callback_tag = (gobject.child_watch_add
536
 
                                             (self.checker.pid,
537
 
                                              self.checker_callback,
538
 
                                              data=command))
539
 
                # The checker may have completed before the gobject
540
 
                # watch was added.  Check for this.
541
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
542
 
                if pid:
543
 
                    gobject.source_remove(self.checker_callback_tag)
544
 
                    self.checker_callback(pid, status, command)
545
 
            except OSError as error:
546
 
                logger.error("Failed to start subprocess: %s",
 
224
                self.checker = subprocess.\
 
225
                               Popen(command,
 
226
                                     stdout=subprocess.PIPE,
 
227
                                     close_fds=True, shell=True,
 
228
                                     cwd="/")
 
229
                self.checker_callback_tag = gobject.\
 
230
                                            child_watch_add(self.checker.pid,
 
231
                                                            self.\
 
232
                                                            checker_callback)
 
233
            except subprocess.OSError, error:
 
234
                logger.error(u"Failed to start subprocess: %s",
547
235
                             error)
548
236
        # Re-run this periodically if run by gobject.timeout_add
549
237
        return True
550
 
    
551
238
    def stop_checker(self):
552
239
        """Force the checker process, if any, to stop."""
553
 
        if self.checker_callback_tag:
554
 
            gobject.source_remove(self.checker_callback_tag)
555
 
            self.checker_callback_tag = None
556
 
        if getattr(self, "checker", None) is None:
 
240
        if not hasattr(self, "checker") or self.checker is None:
557
241
            return
558
 
        logger.debug("Stopping checker for %(name)s", vars(self))
559
 
        try:
560
 
            os.kill(self.checker.pid, signal.SIGTERM)
561
 
            #time.sleep(0.5)
562
 
            #if self.checker.poll() is None:
563
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
564
 
        except OSError as error:
565
 
            if error.errno != errno.ESRCH: # No such process
566
 
                raise
567
 
        self.checker = None
568
 
 
569
 
 
570
 
def dbus_service_property(dbus_interface, signature="v",
571
 
                          access="readwrite", byte_arrays=False):
572
 
    """Decorators for marking methods of a DBusObjectWithProperties to
573
 
    become properties on the D-Bus.
574
 
    
575
 
    The decorated method will be called with no arguments by "Get"
576
 
    and with one argument by "Set".
577
 
    
578
 
    The parameters, where they are supported, are the same as
579
 
    dbus.service.method, except there is only "signature", since the
580
 
    type from Get() and the type sent to Set() is the same.
581
 
    """
582
 
    # Encoding deeply encoded byte arrays is not supported yet by the
583
 
    # "Set" method, so we fail early here:
584
 
    if byte_arrays and signature != "ay":
585
 
        raise ValueError("Byte arrays not supported for non-'ay'"
586
 
                         " signature %r" % signature)
587
 
    def decorator(func):
588
 
        func._dbus_is_property = True
589
 
        func._dbus_interface = dbus_interface
590
 
        func._dbus_signature = signature
591
 
        func._dbus_access = access
592
 
        func._dbus_name = func.__name__
593
 
        if func._dbus_name.endswith("_dbus_property"):
594
 
            func._dbus_name = func._dbus_name[:-14]
595
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
596
 
        return func
597
 
    return decorator
598
 
 
599
 
 
600
 
class DBusPropertyException(dbus.exceptions.DBusException):
601
 
    """A base class for D-Bus property-related exceptions
602
 
    """
603
 
    def __unicode__(self):
604
 
        return unicode(str(self))
605
 
 
606
 
 
607
 
class DBusPropertyAccessException(DBusPropertyException):
608
 
    """A property's access permissions disallows an operation.
609
 
    """
610
 
    pass
611
 
 
612
 
 
613
 
class DBusPropertyNotFound(DBusPropertyException):
614
 
    """An attempt was made to access a non-existing property.
615
 
    """
616
 
    pass
617
 
 
618
 
 
619
 
class DBusObjectWithProperties(dbus.service.Object):
620
 
    """A D-Bus object with properties.
621
 
    
622
 
    Classes inheriting from this can use the dbus_service_property
623
 
    decorator to expose methods as D-Bus properties.  It exposes the
624
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
625
 
    """
626
 
    
627
 
    @staticmethod
628
 
    def _is_dbus_property(obj):
629
 
        return getattr(obj, "_dbus_is_property", False)
630
 
    
631
 
    def _get_all_dbus_properties(self):
632
 
        """Returns a generator of (name, attribute) pairs
633
 
        """
634
 
        return ((prop.__get__(self)._dbus_name, prop.__get__(self))
635
 
                for cls in self.__class__.__mro__
636
 
                for name, prop in
637
 
                inspect.getmembers(cls, self._is_dbus_property))
638
 
    
639
 
    def _get_dbus_property(self, interface_name, property_name):
640
 
        """Returns a bound method if one exists which is a D-Bus
641
 
        property with the specified name and interface.
642
 
        """
643
 
        for cls in  self.__class__.__mro__:
644
 
            for name, value in (inspect.getmembers
645
 
                                (cls, self._is_dbus_property)):
646
 
                if (value._dbus_name == property_name
647
 
                    and value._dbus_interface == interface_name):
648
 
                    return value.__get__(self)
649
 
        
650
 
        # No such property
651
 
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
652
 
                                   + interface_name + "."
653
 
                                   + property_name)
654
 
    
655
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
656
 
                         out_signature="v")
657
 
    def Get(self, interface_name, property_name):
658
 
        """Standard D-Bus property Get() method, see D-Bus standard.
659
 
        """
660
 
        prop = self._get_dbus_property(interface_name, property_name)
661
 
        if prop._dbus_access == "write":
662
 
            raise DBusPropertyAccessException(property_name)
663
 
        value = prop()
664
 
        if not hasattr(value, "variant_level"):
665
 
            return value
666
 
        return type(value)(value, variant_level=value.variant_level+1)
667
 
    
668
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
669
 
    def Set(self, interface_name, property_name, value):
670
 
        """Standard D-Bus property Set() method, see D-Bus standard.
671
 
        """
672
 
        prop = self._get_dbus_property(interface_name, property_name)
673
 
        if prop._dbus_access == "read":
674
 
            raise DBusPropertyAccessException(property_name)
675
 
        if prop._dbus_get_args_options["byte_arrays"]:
676
 
            # The byte_arrays option is not supported yet on
677
 
            # signatures other than "ay".
678
 
            if prop._dbus_signature != "ay":
679
 
                raise ValueError
680
 
            value = dbus.ByteArray(''.join(unichr(byte)
681
 
                                           for byte in value))
682
 
        prop(value)
683
 
    
684
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
685
 
                         out_signature="a{sv}")
686
 
    def GetAll(self, interface_name):
687
 
        """Standard D-Bus property GetAll() method, see D-Bus
688
 
        standard.
689
 
        
690
 
        Note: Will not include properties with access="write".
691
 
        """
692
 
        all = {}
693
 
        for name, prop in self._get_all_dbus_properties():
694
 
            if (interface_name
695
 
                and interface_name != prop._dbus_interface):
696
 
                # Interface non-empty but did not match
697
 
                continue
698
 
            # Ignore write-only properties
699
 
            if prop._dbus_access == "write":
700
 
                continue
701
 
            value = prop()
702
 
            if not hasattr(value, "variant_level"):
703
 
                all[name] = value
704
 
                continue
705
 
            all[name] = type(value)(value, variant_level=
706
 
                                    value.variant_level+1)
707
 
        return dbus.Dictionary(all, signature="sv")
708
 
    
709
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
710
 
                         out_signature="s",
711
 
                         path_keyword='object_path',
712
 
                         connection_keyword='connection')
713
 
    def Introspect(self, object_path, connection):
714
 
        """Standard D-Bus method, overloaded to insert property tags.
715
 
        """
716
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
717
 
                                                   connection)
718
 
        try:
719
 
            document = xml.dom.minidom.parseString(xmlstring)
720
 
            def make_tag(document, name, prop):
721
 
                e = document.createElement("property")
722
 
                e.setAttribute("name", name)
723
 
                e.setAttribute("type", prop._dbus_signature)
724
 
                e.setAttribute("access", prop._dbus_access)
725
 
                return e
726
 
            for if_tag in document.getElementsByTagName("interface"):
727
 
                for tag in (make_tag(document, name, prop)
728
 
                            for name, prop
729
 
                            in self._get_all_dbus_properties()
730
 
                            if prop._dbus_interface
731
 
                            == if_tag.getAttribute("name")):
732
 
                    if_tag.appendChild(tag)
733
 
                # Add the names to the return values for the
734
 
                # "org.freedesktop.DBus.Properties" methods
735
 
                if (if_tag.getAttribute("name")
736
 
                    == "org.freedesktop.DBus.Properties"):
737
 
                    for cn in if_tag.getElementsByTagName("method"):
738
 
                        if cn.getAttribute("name") == "Get":
739
 
                            for arg in cn.getElementsByTagName("arg"):
740
 
                                if (arg.getAttribute("direction")
741
 
                                    == "out"):
742
 
                                    arg.setAttribute("name", "value")
743
 
                        elif cn.getAttribute("name") == "GetAll":
744
 
                            for arg in cn.getElementsByTagName("arg"):
745
 
                                if (arg.getAttribute("direction")
746
 
                                    == "out"):
747
 
                                    arg.setAttribute("name", "props")
748
 
            xmlstring = document.toxml("utf-8")
749
 
            document.unlink()
750
 
        except (AttributeError, xml.dom.DOMException,
751
 
                xml.parsers.expat.ExpatError) as error:
752
 
            logger.error("Failed to override Introspection method",
753
 
                         error)
754
 
        return xmlstring
755
 
 
756
 
 
757
 
def datetime_to_dbus (dt, variant_level=0):
758
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
759
 
    if dt is None:
760
 
        return dbus.String("", variant_level = variant_level)
761
 
    return dbus.String(dt.isoformat(),
762
 
                       variant_level=variant_level)
763
 
 
764
 
class AlternateDBusNamesMetaclass(DBusObjectWithProperties
765
 
                                  .__metaclass__):
766
 
    """Applied to an empty subclass of a D-Bus object, this metaclass
767
 
    will add additional D-Bus attributes matching a certain pattern.
768
 
    """
769
 
    def __new__(mcs, name, bases, attr):
770
 
        # Go through all the base classes which could have D-Bus
771
 
        # methods, signals, or properties in them
772
 
        for base in (b for b in bases
773
 
                     if issubclass(b, dbus.service.Object)):
774
 
            # Go though all attributes of the base class
775
 
            for attrname, attribute in inspect.getmembers(base):
776
 
                # Ignore non-D-Bus attributes, and D-Bus attributes
777
 
                # with the wrong interface name
778
 
                if (not hasattr(attribute, "_dbus_interface")
779
 
                    or not attribute._dbus_interface
780
 
                    .startswith("se.recompile.Mandos")):
781
 
                    continue
782
 
                # Create an alternate D-Bus interface name based on
783
 
                # the current name
784
 
                alt_interface = (attribute._dbus_interface
785
 
                                 .replace("se.recompile.Mandos",
786
 
                                          "se.bsnet.fukt.Mandos"))
787
 
                # Is this a D-Bus signal?
788
 
                if getattr(attribute, "_dbus_is_signal", False):
789
 
                    # Extract the original non-method function by
790
 
                    # black magic
791
 
                    nonmethod_func = (dict(
792
 
                            zip(attribute.func_code.co_freevars,
793
 
                                attribute.__closure__))["func"]
794
 
                                      .cell_contents)
795
 
                    # Create a new, but exactly alike, function
796
 
                    # object, and decorate it to be a new D-Bus signal
797
 
                    # with the alternate D-Bus interface name
798
 
                    new_function = (dbus.service.signal
799
 
                                    (alt_interface,
800
 
                                     attribute._dbus_signature)
801
 
                                    (types.FunctionType(
802
 
                                nonmethod_func.func_code,
803
 
                                nonmethod_func.func_globals,
804
 
                                nonmethod_func.func_name,
805
 
                                nonmethod_func.func_defaults,
806
 
                                nonmethod_func.func_closure)))
807
 
                    # Define a creator of a function to call both the
808
 
                    # old and new functions, so both the old and new
809
 
                    # signals gets sent when the function is called
810
 
                    def fixscope(func1, func2):
811
 
                        """This function is a scope container to pass
812
 
                        func1 and func2 to the "call_both" function
813
 
                        outside of its arguments"""
814
 
                        def call_both(*args, **kwargs):
815
 
                            """This function will emit two D-Bus
816
 
                            signals by calling func1 and func2"""
817
 
                            func1(*args, **kwargs)
818
 
                            func2(*args, **kwargs)
819
 
                        return call_both
820
 
                    # Create the "call_both" function and add it to
821
 
                    # the class
822
 
                    attr[attrname] = fixscope(attribute,
823
 
                                              new_function)
824
 
                # Is this a D-Bus method?
825
 
                elif getattr(attribute, "_dbus_is_method", False):
826
 
                    # Create a new, but exactly alike, function
827
 
                    # object.  Decorate it to be a new D-Bus method
828
 
                    # with the alternate D-Bus interface name.  Add it
829
 
                    # to the class.
830
 
                    attr[attrname] = (dbus.service.method
831
 
                                      (alt_interface,
832
 
                                       attribute._dbus_in_signature,
833
 
                                       attribute._dbus_out_signature)
834
 
                                      (types.FunctionType
835
 
                                       (attribute.func_code,
836
 
                                        attribute.func_globals,
837
 
                                        attribute.func_name,
838
 
                                        attribute.func_defaults,
839
 
                                        attribute.func_closure)))
840
 
                # Is this a D-Bus property?
841
 
                elif getattr(attribute, "_dbus_is_property", False):
842
 
                    # Create a new, but exactly alike, function
843
 
                    # object, and decorate it to be a new D-Bus
844
 
                    # property with the alternate D-Bus interface
845
 
                    # name.  Add it to the class.
846
 
                    attr[attrname] = (dbus_service_property
847
 
                                      (alt_interface,
848
 
                                       attribute._dbus_signature,
849
 
                                       attribute._dbus_access,
850
 
                                       attribute
851
 
                                       ._dbus_get_args_options
852
 
                                       ["byte_arrays"])
853
 
                                      (types.FunctionType
854
 
                                       (attribute.func_code,
855
 
                                        attribute.func_globals,
856
 
                                        attribute.func_name,
857
 
                                        attribute.func_defaults,
858
 
                                        attribute.func_closure)))
859
 
        return type.__new__(mcs, name, bases, attr)
860
 
 
861
 
class ClientDBus(Client, DBusObjectWithProperties):
862
 
    """A Client class using D-Bus
863
 
    
864
 
    Attributes:
865
 
    dbus_object_path: dbus.ObjectPath
866
 
    bus: dbus.SystemBus()
867
 
    """
868
 
    
869
 
    runtime_expansions = (Client.runtime_expansions
870
 
                          + ("dbus_object_path",))
871
 
    
872
 
    # dbus.service.Object doesn't use super(), so we can't either.
873
 
    
874
 
    def __init__(self, bus = None, *args, **kwargs):
875
 
        self._approvals_pending = 0
876
 
        self.bus = bus
877
 
        Client.__init__(self, *args, **kwargs)
878
 
        # Only now, when this client is initialized, can it show up on
879
 
        # the D-Bus
880
 
        client_object_name = unicode(self.name).translate(
881
 
            {ord("."): ord("_"),
882
 
             ord("-"): ord("_")})
883
 
        self.dbus_object_path = (dbus.ObjectPath
884
 
                                 ("/clients/" + client_object_name))
885
 
        DBusObjectWithProperties.__init__(self, self.bus,
886
 
                                          self.dbus_object_path)
887
 
        
888
 
    def notifychangeproperty(transform_func,
889
 
                             dbus_name, type_func=lambda x: x,
890
 
                             variant_level=1):
891
 
        """ Modify a variable so that it's a property which announces
892
 
        its changes to DBus.
893
 
 
894
 
        transform_fun: Function that takes a value and a variant_level
895
 
                       and transforms it to a D-Bus type.
896
 
        dbus_name: D-Bus name of the variable
897
 
        type_func: Function that transform the value before sending it
898
 
                   to the D-Bus.  Default: no transform
899
 
        variant_level: D-Bus variant level.  Default: 1
900
 
        """
901
 
        attrname = "_{0}".format(dbus_name)
902
 
        def setter(self, value):
903
 
            if hasattr(self, "dbus_object_path"):
904
 
                if (not hasattr(self, attrname) or
905
 
                    type_func(getattr(self, attrname, None))
906
 
                    != type_func(value)):
907
 
                    dbus_value = transform_func(type_func(value),
908
 
                                                variant_level
909
 
                                                =variant_level)
910
 
                    self.PropertyChanged(dbus.String(dbus_name),
911
 
                                         dbus_value)
912
 
            setattr(self, attrname, value)
913
 
        
914
 
        return property(lambda self: getattr(self, attrname), setter)
915
 
    
916
 
    
917
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
918
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
919
 
                                             "ApprovalPending",
920
 
                                             type_func = bool)
921
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
922
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
923
 
                                        "LastEnabled")
924
 
    checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
925
 
                                   type_func = lambda checker:
926
 
                                       checker is not None)
927
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
928
 
                                           "LastCheckedOK")
929
 
    last_approval_request = notifychangeproperty(
930
 
        datetime_to_dbus, "LastApprovalRequest")
931
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
932
 
                                               "ApprovedByDefault")
933
 
    approval_delay = notifychangeproperty(dbus.UInt16,
934
 
                                          "ApprovalDelay",
935
 
                                          type_func =
936
 
                                          _timedelta_to_milliseconds)
937
 
    approval_duration = notifychangeproperty(
938
 
        dbus.UInt16, "ApprovalDuration",
939
 
        type_func = _timedelta_to_milliseconds)
940
 
    host = notifychangeproperty(dbus.String, "Host")
941
 
    timeout = notifychangeproperty(dbus.UInt16, "Timeout",
942
 
                                   type_func =
943
 
                                   _timedelta_to_milliseconds)
944
 
    extended_timeout = notifychangeproperty(
945
 
        dbus.UInt16, "ExtendedTimeout",
946
 
        type_func = _timedelta_to_milliseconds)
947
 
    interval = notifychangeproperty(dbus.UInt16,
948
 
                                    "Interval",
949
 
                                    type_func =
950
 
                                    _timedelta_to_milliseconds)
951
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
952
 
    
953
 
    del notifychangeproperty
954
 
    
955
 
    def __del__(self, *args, **kwargs):
956
 
        try:
957
 
            self.remove_from_connection()
958
 
        except LookupError:
959
 
            pass
960
 
        if hasattr(DBusObjectWithProperties, "__del__"):
961
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
962
 
        Client.__del__(self, *args, **kwargs)
963
 
    
964
 
    def checker_callback(self, pid, condition, command,
965
 
                         *args, **kwargs):
 
242
        gobject.source_remove(self.checker_callback_tag)
966
243
        self.checker_callback_tag = None
 
244
        os.kill(self.checker.pid, signal.SIGTERM)
 
245
        if self.checker.poll() is None:
 
246
            os.kill(self.checker.pid, signal.SIGKILL)
967
247
        self.checker = None
968
 
        if os.WIFEXITED(condition):
969
 
            exitstatus = os.WEXITSTATUS(condition)
970
 
            # Emit D-Bus signal
971
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
972
 
                                  dbus.Int64(condition),
973
 
                                  dbus.String(command))
974
 
        else:
975
 
            # Emit D-Bus signal
976
 
            self.CheckerCompleted(dbus.Int16(-1),
977
 
                                  dbus.Int64(condition),
978
 
                                  dbus.String(command))
979
 
        
980
 
        return Client.checker_callback(self, pid, condition, command,
981
 
                                       *args, **kwargs)
982
 
    
983
 
    def start_checker(self, *args, **kwargs):
984
 
        old_checker = self.checker
985
 
        if self.checker is not None:
986
 
            old_checker_pid = self.checker.pid
987
 
        else:
988
 
            old_checker_pid = None
989
 
        r = Client.start_checker(self, *args, **kwargs)
990
 
        # Only if new checker process was started
991
 
        if (self.checker is not None
992
 
            and old_checker_pid != self.checker.pid):
993
 
            # Emit D-Bus signal
994
 
            self.CheckerStarted(self.current_checker_command)
995
 
        return r
996
 
    
997
 
    def _reset_approved(self):
998
 
        self._approved = None
999
 
        return False
1000
 
    
1001
 
    def approve(self, value=True):
1002
 
        self.send_changedstate()
1003
 
        self._approved = value
1004
 
        gobject.timeout_add(_timedelta_to_milliseconds
1005
 
                            (self.approval_duration),
1006
 
                            self._reset_approved)
1007
 
    
1008
 
    
1009
 
    ## D-Bus methods, signals & properties
1010
 
    _interface = "se.recompile.Mandos.Client"
1011
 
    
1012
 
    ## Signals
1013
 
    
1014
 
    # CheckerCompleted - signal
1015
 
    @dbus.service.signal(_interface, signature="nxs")
1016
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
1017
 
        "D-Bus signal"
1018
 
        pass
1019
 
    
1020
 
    # CheckerStarted - signal
1021
 
    @dbus.service.signal(_interface, signature="s")
1022
 
    def CheckerStarted(self, command):
1023
 
        "D-Bus signal"
1024
 
        pass
1025
 
    
1026
 
    # PropertyChanged - signal
1027
 
    @dbus.service.signal(_interface, signature="sv")
1028
 
    def PropertyChanged(self, property, value):
1029
 
        "D-Bus signal"
1030
 
        pass
1031
 
    
1032
 
    # GotSecret - signal
1033
 
    @dbus.service.signal(_interface)
1034
 
    def GotSecret(self):
1035
 
        """D-Bus signal
1036
 
        Is sent after a successful transfer of secret from the Mandos
1037
 
        server to mandos-client
1038
 
        """
1039
 
        pass
1040
 
    
1041
 
    # Rejected - signal
1042
 
    @dbus.service.signal(_interface, signature="s")
1043
 
    def Rejected(self, reason):
1044
 
        "D-Bus signal"
1045
 
        pass
1046
 
    
1047
 
    # NeedApproval - signal
1048
 
    @dbus.service.signal(_interface, signature="tb")
1049
 
    def NeedApproval(self, timeout, default):
1050
 
        "D-Bus signal"
1051
 
        return self.need_approval()
1052
 
    
1053
 
    ## Methods
1054
 
    
1055
 
    # Approve - method
1056
 
    @dbus.service.method(_interface, in_signature="b")
1057
 
    def Approve(self, value):
1058
 
        self.approve(value)
1059
 
    
1060
 
    # CheckedOK - method
1061
 
    @dbus.service.method(_interface)
1062
 
    def CheckedOK(self):
1063
 
        self.checked_ok()
1064
 
    
1065
 
    # Enable - method
1066
 
    @dbus.service.method(_interface)
1067
 
    def Enable(self):
1068
 
        "D-Bus method"
1069
 
        self.enable()
1070
 
    
1071
 
    # StartChecker - method
1072
 
    @dbus.service.method(_interface)
1073
 
    def StartChecker(self):
1074
 
        "D-Bus method"
1075
 
        self.start_checker()
1076
 
    
1077
 
    # Disable - method
1078
 
    @dbus.service.method(_interface)
1079
 
    def Disable(self):
1080
 
        "D-Bus method"
1081
 
        self.disable()
1082
 
    
1083
 
    # StopChecker - method
1084
 
    @dbus.service.method(_interface)
1085
 
    def StopChecker(self):
1086
 
        self.stop_checker()
1087
 
    
1088
 
    ## Properties
1089
 
    
1090
 
    # ApprovalPending - property
1091
 
    @dbus_service_property(_interface, signature="b", access="read")
1092
 
    def ApprovalPending_dbus_property(self):
1093
 
        return dbus.Boolean(bool(self.approvals_pending))
1094
 
    
1095
 
    # ApprovedByDefault - property
1096
 
    @dbus_service_property(_interface, signature="b",
1097
 
                           access="readwrite")
1098
 
    def ApprovedByDefault_dbus_property(self, value=None):
1099
 
        if value is None:       # get
1100
 
            return dbus.Boolean(self.approved_by_default)
1101
 
        self.approved_by_default = bool(value)
1102
 
    
1103
 
    # ApprovalDelay - property
1104
 
    @dbus_service_property(_interface, signature="t",
1105
 
                           access="readwrite")
1106
 
    def ApprovalDelay_dbus_property(self, value=None):
1107
 
        if value is None:       # get
1108
 
            return dbus.UInt64(self.approval_delay_milliseconds())
1109
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
1110
 
    
1111
 
    # ApprovalDuration - property
1112
 
    @dbus_service_property(_interface, signature="t",
1113
 
                           access="readwrite")
1114
 
    def ApprovalDuration_dbus_property(self, value=None):
1115
 
        if value is None:       # get
1116
 
            return dbus.UInt64(_timedelta_to_milliseconds(
1117
 
                    self.approval_duration))
1118
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
1119
 
    
1120
 
    # Name - property
1121
 
    @dbus_service_property(_interface, signature="s", access="read")
1122
 
    def Name_dbus_property(self):
1123
 
        return dbus.String(self.name)
1124
 
    
1125
 
    # Fingerprint - property
1126
 
    @dbus_service_property(_interface, signature="s", access="read")
1127
 
    def Fingerprint_dbus_property(self):
1128
 
        return dbus.String(self.fingerprint)
1129
 
    
1130
 
    # Host - property
1131
 
    @dbus_service_property(_interface, signature="s",
1132
 
                           access="readwrite")
1133
 
    def Host_dbus_property(self, value=None):
1134
 
        if value is None:       # get
1135
 
            return dbus.String(self.host)
1136
 
        self.host = value
1137
 
    
1138
 
    # Created - property
1139
 
    @dbus_service_property(_interface, signature="s", access="read")
1140
 
    def Created_dbus_property(self):
1141
 
        return dbus.String(datetime_to_dbus(self.created))
1142
 
    
1143
 
    # LastEnabled - property
1144
 
    @dbus_service_property(_interface, signature="s", access="read")
1145
 
    def LastEnabled_dbus_property(self):
1146
 
        return datetime_to_dbus(self.last_enabled)
1147
 
    
1148
 
    # Enabled - property
1149
 
    @dbus_service_property(_interface, signature="b",
1150
 
                           access="readwrite")
1151
 
    def Enabled_dbus_property(self, value=None):
1152
 
        if value is None:       # get
1153
 
            return dbus.Boolean(self.enabled)
1154
 
        if value:
1155
 
            self.enable()
1156
 
        else:
1157
 
            self.disable()
1158
 
    
1159
 
    # LastCheckedOK - property
1160
 
    @dbus_service_property(_interface, signature="s",
1161
 
                           access="readwrite")
1162
 
    def LastCheckedOK_dbus_property(self, value=None):
1163
 
        if value is not None:
1164
 
            self.checked_ok()
1165
 
            return
1166
 
        return datetime_to_dbus(self.last_checked_ok)
1167
 
    
1168
 
    # Expires - property
1169
 
    @dbus_service_property(_interface, signature="s", access="read")
1170
 
    def Expires_dbus_property(self):
1171
 
        return datetime_to_dbus(self.expires)
1172
 
    
1173
 
    # LastApprovalRequest - property
1174
 
    @dbus_service_property(_interface, signature="s", access="read")
1175
 
    def LastApprovalRequest_dbus_property(self):
1176
 
        return datetime_to_dbus(self.last_approval_request)
1177
 
    
1178
 
    # Timeout - property
1179
 
    @dbus_service_property(_interface, signature="t",
1180
 
                           access="readwrite")
1181
 
    def Timeout_dbus_property(self, value=None):
1182
 
        if value is None:       # get
1183
 
            return dbus.UInt64(self.timeout_milliseconds())
1184
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1185
 
        if getattr(self, "disable_initiator_tag", None) is None:
1186
 
            return
1187
 
        # Reschedule timeout
1188
 
        gobject.source_remove(self.disable_initiator_tag)
1189
 
        self.disable_initiator_tag = None
1190
 
        self.expires = None
1191
 
        time_to_die = _timedelta_to_milliseconds((self
1192
 
                                                  .last_checked_ok
1193
 
                                                  + self.timeout)
1194
 
                                                 - datetime.datetime
1195
 
                                                 .utcnow())
1196
 
        if time_to_die <= 0:
1197
 
            # The timeout has passed
1198
 
            self.disable()
1199
 
        else:
1200
 
            self.expires = (datetime.datetime.utcnow()
1201
 
                            + datetime.timedelta(milliseconds =
1202
 
                                                 time_to_die))
1203
 
            self.disable_initiator_tag = (gobject.timeout_add
1204
 
                                          (time_to_die, self.disable))
1205
 
    
1206
 
    # ExtendedTimeout - property
1207
 
    @dbus_service_property(_interface, signature="t",
1208
 
                           access="readwrite")
1209
 
    def ExtendedTimeout_dbus_property(self, value=None):
1210
 
        if value is None:       # get
1211
 
            return dbus.UInt64(self.extended_timeout_milliseconds())
1212
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1213
 
    
1214
 
    # Interval - property
1215
 
    @dbus_service_property(_interface, signature="t",
1216
 
                           access="readwrite")
1217
 
    def Interval_dbus_property(self, value=None):
1218
 
        if value is None:       # get
1219
 
            return dbus.UInt64(self.interval_milliseconds())
1220
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1221
 
        if getattr(self, "checker_initiator_tag", None) is None:
1222
 
            return
1223
 
        # Reschedule checker run
1224
 
        gobject.source_remove(self.checker_initiator_tag)
1225
 
        self.checker_initiator_tag = (gobject.timeout_add
1226
 
                                      (value, self.start_checker))
1227
 
        self.start_checker()    # Start one now, too
1228
 
    
1229
 
    # Checker - property
1230
 
    @dbus_service_property(_interface, signature="s",
1231
 
                           access="readwrite")
1232
 
    def Checker_dbus_property(self, value=None):
1233
 
        if value is None:       # get
1234
 
            return dbus.String(self.checker_command)
1235
 
        self.checker_command = value
1236
 
    
1237
 
    # CheckerRunning - property
1238
 
    @dbus_service_property(_interface, signature="b",
1239
 
                           access="readwrite")
1240
 
    def CheckerRunning_dbus_property(self, value=None):
1241
 
        if value is None:       # get
1242
 
            return dbus.Boolean(self.checker is not None)
1243
 
        if value:
1244
 
            self.start_checker()
1245
 
        else:
1246
 
            self.stop_checker()
1247
 
    
1248
 
    # ObjectPath - property
1249
 
    @dbus_service_property(_interface, signature="o", access="read")
1250
 
    def ObjectPath_dbus_property(self):
1251
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1252
 
    
1253
 
    # Secret = property
1254
 
    @dbus_service_property(_interface, signature="ay",
1255
 
                           access="write", byte_arrays=True)
1256
 
    def Secret_dbus_property(self, value):
1257
 
        self.secret = str(value)
1258
 
    
1259
 
    del _interface
1260
 
 
1261
 
 
1262
 
class ProxyClient(object):
1263
 
    def __init__(self, child_pipe, fpr, address):
1264
 
        self._pipe = child_pipe
1265
 
        self._pipe.send(('init', fpr, address))
1266
 
        if not self._pipe.recv():
1267
 
            raise KeyError()
1268
 
    
1269
 
    def __getattribute__(self, name):
1270
 
        if(name == '_pipe'):
1271
 
            return super(ProxyClient, self).__getattribute__(name)
1272
 
        self._pipe.send(('getattr', name))
1273
 
        data = self._pipe.recv()
1274
 
        if data[0] == 'data':
1275
 
            return data[1]
1276
 
        if data[0] == 'function':
1277
 
            def func(*args, **kwargs):
1278
 
                self._pipe.send(('funcall', name, args, kwargs))
1279
 
                return self._pipe.recv()[1]
1280
 
            return func
1281
 
    
1282
 
    def __setattr__(self, name, value):
1283
 
        if(name == '_pipe'):
1284
 
            return super(ProxyClient, self).__setattr__(name, value)
1285
 
        self._pipe.send(('setattr', name, value))
1286
 
 
1287
 
class ClientDBusTransitional(ClientDBus):
1288
 
    __metaclass__ = AlternateDBusNamesMetaclass
1289
 
 
1290
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1291
 
    """A class to handle client connections.
1292
 
    
1293
 
    Instantiated once for each connection to handle it.
 
248
    def still_valid(self, now=None):
 
249
        """Has the timeout not yet passed for this client?"""
 
250
        if now is None:
 
251
            now = datetime.datetime.now()
 
252
        if self.last_seen is None:
 
253
            return now < (self.created + self.timeout)
 
254
        else:
 
255
            return now < (self.last_seen + self.timeout)
 
256
 
 
257
 
 
258
def peer_certificate(session):
 
259
    # If not an OpenPGP certificate...
 
260
    if gnutls.library.functions.gnutls_certificate_type_get\
 
261
            (session._c_object) \
 
262
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
263
        # ...do the normal thing
 
264
        return session.peer_certificate
 
265
    list_size = ctypes.c_uint()
 
266
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
267
        (session._c_object, ctypes.byref(list_size))
 
268
    if list_size.value == 0:
 
269
        return None
 
270
    cert = cert_list[0]
 
271
    return ctypes.string_at(cert.data, cert.size)
 
272
 
 
273
 
 
274
def fingerprint(openpgp):
 
275
    # New empty GnuTLS certificate
 
276
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
277
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
278
        (ctypes.byref(crt))
 
279
    # New GnuTLS "datum" with the OpenPGP public key
 
280
    datum = gnutls.library.types.gnutls_datum_t\
 
281
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
282
                     ctypes.POINTER(ctypes.c_ubyte)),
 
283
         ctypes.c_uint(len(openpgp)))
 
284
    # Import the OpenPGP public key into the certificate
 
285
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
286
        (crt,
 
287
         ctypes.byref(datum),
 
288
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
289
    # New buffer for the fingerprint
 
290
    buffer = ctypes.create_string_buffer(20)
 
291
    buffer_length = ctypes.c_size_t()
 
292
    # Get the fingerprint from the certificate into the buffer
 
293
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
294
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
295
    # Deinit the certificate
 
296
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
297
    # Convert the buffer to a Python bytestring
 
298
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
299
    # Convert the bytestring to hexadecimal notation
 
300
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
301
    return hex_fpr
 
302
 
 
303
 
 
304
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
305
    """A TCP request handler class.
 
306
    Instantiated by IPv6_TCPServer for each request to handle it.
1294
307
    Note: This will run in its own forked process."""
1295
308
    
1296
309
    def handle(self):
1297
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1298
 
            logger.info("TCP connection from: %s",
1299
 
                        unicode(self.client_address))
1300
 
            logger.debug("Pipe FD: %d",
1301
 
                         self.server.child_pipe.fileno())
1302
 
            
1303
 
            session = (gnutls.connection
1304
 
                       .ClientSession(self.request,
1305
 
                                      gnutls.connection
1306
 
                                      .X509Credentials()))
1307
 
            
1308
 
            # Note: gnutls.connection.X509Credentials is really a
1309
 
            # generic GnuTLS certificate credentials object so long as
1310
 
            # no X.509 keys are added to it.  Therefore, we can use it
1311
 
            # here despite using OpenPGP certificates.
1312
 
            
1313
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
1314
 
            #                      "+AES-256-CBC", "+SHA1",
1315
 
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
1316
 
            #                      "+DHE-DSS"))
1317
 
            # Use a fallback default, since this MUST be set.
1318
 
            priority = self.server.gnutls_priority
1319
 
            if priority is None:
1320
 
                priority = "NORMAL"
1321
 
            (gnutls.library.functions
1322
 
             .gnutls_priority_set_direct(session._c_object,
1323
 
                                         priority, None))
1324
 
            
1325
 
            # Start communication using the Mandos protocol
1326
 
            # Get protocol number
1327
 
            line = self.request.makefile().readline()
1328
 
            logger.debug("Protocol version: %r", line)
1329
 
            try:
1330
 
                if int(line.strip().split()[0]) > 1:
1331
 
                    raise RuntimeError
1332
 
            except (ValueError, IndexError, RuntimeError) as error:
1333
 
                logger.error("Unknown protocol version: %s", error)
1334
 
                return
1335
 
            
1336
 
            # Start GnuTLS connection
1337
 
            try:
1338
 
                session.handshake()
1339
 
            except gnutls.errors.GNUTLSError as error:
1340
 
                logger.warning("Handshake failed: %s", error)
1341
 
                # Do not run session.bye() here: the session is not
1342
 
                # established.  Just abandon the request.
1343
 
                return
1344
 
            logger.debug("Handshake succeeded")
1345
 
            
1346
 
            approval_required = False
1347
 
            try:
1348
 
                try:
1349
 
                    fpr = self.fingerprint(self.peer_certificate
1350
 
                                           (session))
1351
 
                except (TypeError,
1352
 
                        gnutls.errors.GNUTLSError) as error:
1353
 
                    logger.warning("Bad certificate: %s", error)
1354
 
                    return
1355
 
                logger.debug("Fingerprint: %s", fpr)
1356
 
                
1357
 
                try:
1358
 
                    client = ProxyClient(child_pipe, fpr,
1359
 
                                         self.client_address)
1360
 
                except KeyError:
1361
 
                    return
1362
 
                
1363
 
                if client.approval_delay:
1364
 
                    delay = client.approval_delay
1365
 
                    client.approvals_pending += 1
1366
 
                    approval_required = True
1367
 
                
1368
 
                while True:
1369
 
                    if not client.enabled:
1370
 
                        logger.info("Client %s is disabled",
1371
 
                                       client.name)
1372
 
                        if self.server.use_dbus:
1373
 
                            # Emit D-Bus signal
1374
 
                            client.Rejected("Disabled")
1375
 
                        return
1376
 
                    
1377
 
                    if client._approved or not client.approval_delay:
1378
 
                        #We are approved or approval is disabled
1379
 
                        break
1380
 
                    elif client._approved is None:
1381
 
                        logger.info("Client %s needs approval",
1382
 
                                    client.name)
1383
 
                        if self.server.use_dbus:
1384
 
                            # Emit D-Bus signal
1385
 
                            client.NeedApproval(
1386
 
                                client.approval_delay_milliseconds(),
1387
 
                                client.approved_by_default)
1388
 
                    else:
1389
 
                        logger.warning("Client %s was not approved",
1390
 
                                       client.name)
1391
 
                        if self.server.use_dbus:
1392
 
                            # Emit D-Bus signal
1393
 
                            client.Rejected("Denied")
1394
 
                        return
1395
 
                    
1396
 
                    #wait until timeout or approved
1397
 
                    time = datetime.datetime.now()
1398
 
                    client.changedstate.acquire()
1399
 
                    (client.changedstate.wait
1400
 
                     (float(client._timedelta_to_milliseconds(delay)
1401
 
                            / 1000)))
1402
 
                    client.changedstate.release()
1403
 
                    time2 = datetime.datetime.now()
1404
 
                    if (time2 - time) >= delay:
1405
 
                        if not client.approved_by_default:
1406
 
                            logger.warning("Client %s timed out while"
1407
 
                                           " waiting for approval",
1408
 
                                           client.name)
1409
 
                            if self.server.use_dbus:
1410
 
                                # Emit D-Bus signal
1411
 
                                client.Rejected("Approval timed out")
1412
 
                            return
1413
 
                        else:
1414
 
                            break
1415
 
                    else:
1416
 
                        delay -= time2 - time
1417
 
                
1418
 
                sent_size = 0
1419
 
                while sent_size < len(client.secret):
1420
 
                    try:
1421
 
                        sent = session.send(client.secret[sent_size:])
1422
 
                    except gnutls.errors.GNUTLSError as error:
1423
 
                        logger.warning("gnutls send failed")
1424
 
                        return
1425
 
                    logger.debug("Sent: %d, remaining: %d",
1426
 
                                 sent, len(client.secret)
1427
 
                                 - (sent_size + sent))
1428
 
                    sent_size += sent
1429
 
                
1430
 
                logger.info("Sending secret to %s", client.name)
1431
 
                # bump the timeout using extended_timeout
1432
 
                client.checked_ok(client.extended_timeout)
1433
 
                if self.server.use_dbus:
1434
 
                    # Emit D-Bus signal
1435
 
                    client.GotSecret()
1436
 
            
1437
 
            finally:
1438
 
                if approval_required:
1439
 
                    client.approvals_pending -= 1
1440
 
                try:
1441
 
                    session.bye()
1442
 
                except gnutls.errors.GNUTLSError as error:
1443
 
                    logger.warning("GnuTLS bye failed")
1444
 
    
1445
 
    @staticmethod
1446
 
    def peer_certificate(session):
1447
 
        "Return the peer's OpenPGP certificate as a bytestring"
1448
 
        # If not an OpenPGP certificate...
1449
 
        if (gnutls.library.functions
1450
 
            .gnutls_certificate_type_get(session._c_object)
1451
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1452
 
            # ...do the normal thing
1453
 
            return session.peer_certificate
1454
 
        list_size = ctypes.c_uint(1)
1455
 
        cert_list = (gnutls.library.functions
1456
 
                     .gnutls_certificate_get_peers
1457
 
                     (session._c_object, ctypes.byref(list_size)))
1458
 
        if not bool(cert_list) and list_size.value != 0:
1459
 
            raise gnutls.errors.GNUTLSError("error getting peer"
1460
 
                                            " certificate")
1461
 
        if list_size.value == 0:
1462
 
            return None
1463
 
        cert = cert_list[0]
1464
 
        return ctypes.string_at(cert.data, cert.size)
1465
 
    
1466
 
    @staticmethod
1467
 
    def fingerprint(openpgp):
1468
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1469
 
        # New GnuTLS "datum" with the OpenPGP public key
1470
 
        datum = (gnutls.library.types
1471
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1472
 
                                             ctypes.POINTER
1473
 
                                             (ctypes.c_ubyte)),
1474
 
                                 ctypes.c_uint(len(openpgp))))
1475
 
        # New empty GnuTLS certificate
1476
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1477
 
        (gnutls.library.functions
1478
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1479
 
        # Import the OpenPGP public key into the certificate
1480
 
        (gnutls.library.functions
1481
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1482
 
                                    gnutls.library.constants
1483
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1484
 
        # Verify the self signature in the key
1485
 
        crtverify = ctypes.c_uint()
1486
 
        (gnutls.library.functions
1487
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1488
 
                                         ctypes.byref(crtverify)))
1489
 
        if crtverify.value != 0:
1490
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1491
 
            raise (gnutls.errors.CertificateSecurityError
1492
 
                   ("Verify failed"))
1493
 
        # New buffer for the fingerprint
1494
 
        buf = ctypes.create_string_buffer(20)
1495
 
        buf_len = ctypes.c_size_t()
1496
 
        # Get the fingerprint from the certificate into the buffer
1497
 
        (gnutls.library.functions
1498
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1499
 
                                             ctypes.byref(buf_len)))
1500
 
        # Deinit the certificate
1501
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1502
 
        # Convert the buffer to a Python bytestring
1503
 
        fpr = ctypes.string_at(buf, buf_len.value)
1504
 
        # Convert the bytestring to hexadecimal notation
1505
 
        hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
1506
 
        return hex_fpr
1507
 
 
1508
 
 
1509
 
class MultiprocessingMixIn(object):
1510
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1511
 
    def sub_process_main(self, request, address):
1512
 
        try:
1513
 
            self.finish_request(request, address)
1514
 
        except:
1515
 
            self.handle_error(request, address)
1516
 
        self.close_request(request)
1517
 
    
1518
 
    def process_request(self, request, address):
1519
 
        """Start a new process to process the request."""
1520
 
        proc = multiprocessing.Process(target = self.sub_process_main,
1521
 
                                       args = (request,
1522
 
                                               address))
1523
 
        proc.start()
1524
 
        return proc
1525
 
 
1526
 
 
1527
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1528
 
    """ adds a pipe to the MixIn """
1529
 
    def process_request(self, request, client_address):
1530
 
        """Overrides and wraps the original process_request().
1531
 
        
1532
 
        This function creates a new pipe in self.pipe
1533
 
        """
1534
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1535
 
        
1536
 
        proc = MultiprocessingMixIn.process_request(self, request,
1537
 
                                                    client_address)
1538
 
        self.child_pipe.close()
1539
 
        self.add_pipe(parent_pipe, proc)
1540
 
    
1541
 
    def add_pipe(self, parent_pipe, proc):
1542
 
        """Dummy function; override as necessary"""
1543
 
        raise NotImplementedError
1544
 
 
1545
 
 
1546
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1547
 
                     socketserver.TCPServer, object):
1548
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1549
 
    
 
310
        logger.debug(u"TCP connection from: %s",
 
311
                     unicode(self.client_address))
 
312
        session = gnutls.connection.ClientSession(self.request,
 
313
                                                  gnutls.connection.\
 
314
                                                  X509Credentials())
 
315
        
 
316
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
317
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
318
        #                "+DHE-DSS"))
 
319
        priority = "SECURE256"
 
320
        
 
321
        gnutls.library.functions.gnutls_priority_set_direct\
 
322
            (session._c_object, priority, None);
 
323
        
 
324
        try:
 
325
            session.handshake()
 
326
        except gnutls.errors.GNUTLSError, error:
 
327
            logger.debug(u"Handshake failed: %s", error)
 
328
            # Do not run session.bye() here: the session is not
 
329
            # established.  Just abandon the request.
 
330
            return
 
331
        try:
 
332
            fpr = fingerprint(peer_certificate(session))
 
333
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
334
            logger.debug(u"Bad certificate: %s", error)
 
335
            session.bye()
 
336
            return
 
337
        logger.debug(u"Fingerprint: %s", fpr)
 
338
        client = None
 
339
        for c in clients:
 
340
            if c.fingerprint == fpr:
 
341
                client = c
 
342
                break
 
343
        # Have to check if client.still_valid(), since it is possible
 
344
        # that the client timed out while establishing the GnuTLS
 
345
        # session.
 
346
        if (not client) or (not client.still_valid()):
 
347
            if client:
 
348
                logger.debug(u"Client %(name)s is invalid",
 
349
                             vars(client))
 
350
            else:
 
351
                logger.debug(u"Client not found for fingerprint: %s",
 
352
                             fpr)
 
353
            session.bye()
 
354
            return
 
355
        sent_size = 0
 
356
        while sent_size < len(client.secret):
 
357
            sent = session.send(client.secret[sent_size:])
 
358
            logger.debug(u"Sent: %d, remaining: %d",
 
359
                         sent, len(client.secret)
 
360
                         - (sent_size + sent))
 
361
            sent_size += sent
 
362
        session.bye()
 
363
 
 
364
 
 
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
366
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
1550
367
    Attributes:
1551
 
        enabled:        Boolean; whether this server is activated yet
1552
 
        interface:      None or a network interface name (string)
1553
 
        use_ipv6:       Boolean; to use IPv6 or not
 
368
        options:        Command line options
 
369
        clients:        Set() of Client objects
1554
370
    """
1555
 
    def __init__(self, server_address, RequestHandlerClass,
1556
 
                 interface=None, use_ipv6=True):
1557
 
        self.interface = interface
1558
 
        if use_ipv6:
1559
 
            self.address_family = socket.AF_INET6
1560
 
        socketserver.TCPServer.__init__(self, server_address,
1561
 
                                        RequestHandlerClass)
 
371
    address_family = socket.AF_INET6
 
372
    def __init__(self, *args, **kwargs):
 
373
        if "options" in kwargs:
 
374
            self.options = kwargs["options"]
 
375
            del kwargs["options"]
 
376
        if "clients" in kwargs:
 
377
            self.clients = kwargs["clients"]
 
378
            del kwargs["clients"]
 
379
        return super(type(self), self).__init__(*args, **kwargs)
1562
380
    def server_bind(self):
1563
381
        """This overrides the normal server_bind() function
1564
382
        to bind to an interface if one was specified, and also NOT to
1565
383
        bind to an address or port if they were not specified."""
1566
 
        if self.interface is not None:
1567
 
            if SO_BINDTODEVICE is None:
1568
 
                logger.error("SO_BINDTODEVICE does not exist;"
1569
 
                             " cannot bind to interface %s",
1570
 
                             self.interface)
1571
 
            else:
1572
 
                try:
1573
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1574
 
                                           SO_BINDTODEVICE,
1575
 
                                           str(self.interface
1576
 
                                               + '\0'))
1577
 
                except socket.error as error:
1578
 
                    if error[0] == errno.EPERM:
1579
 
                        logger.error("No permission to"
1580
 
                                     " bind to interface %s",
1581
 
                                     self.interface)
1582
 
                    elif error[0] == errno.ENOPROTOOPT:
1583
 
                        logger.error("SO_BINDTODEVICE not available;"
1584
 
                                     " cannot bind to interface %s",
1585
 
                                     self.interface)
1586
 
                    else:
1587
 
                        raise
 
384
        if self.options.interface:
 
385
            if not hasattr(socket, "SO_BINDTODEVICE"):
 
386
                # From /usr/include/asm-i486/socket.h
 
387
                socket.SO_BINDTODEVICE = 25
 
388
            try:
 
389
                self.socket.setsockopt(socket.SOL_SOCKET,
 
390
                                       socket.SO_BINDTODEVICE,
 
391
                                       self.options.interface)
 
392
            except socket.error, error:
 
393
                if error[0] == errno.EPERM:
 
394
                    logger.warning(u"No permission to"
 
395
                                   u" bind to interface %s",
 
396
                                   self.options.interface)
 
397
                else:
 
398
                    raise error
1588
399
        # Only bind(2) the socket if we really need to.
1589
400
        if self.server_address[0] or self.server_address[1]:
1590
401
            if not self.server_address[0]:
1591
 
                if self.address_family == socket.AF_INET6:
1592
 
                    any_address = "::" # in6addr_any
1593
 
                else:
1594
 
                    any_address = socket.INADDR_ANY
1595
 
                self.server_address = (any_address,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
1596
404
                                       self.server_address[1])
1597
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
1598
406
                self.server_address = (self.server_address[0],
1599
407
                                       0)
1600
 
#                 if self.interface:
1601
 
#                     self.server_address = (self.server_address[0],
1602
 
#                                            0, # port
1603
 
#                                            0, # flowinfo
1604
 
#                                            if_nametoindex
1605
 
#                                            (self.interface))
1606
 
            return socketserver.TCPServer.server_bind(self)
1607
 
 
1608
 
 
1609
 
class MandosServer(IPv6_TCPServer):
1610
 
    """Mandos server.
1611
 
    
1612
 
    Attributes:
1613
 
        clients:        set of Client objects
1614
 
        gnutls_priority GnuTLS priority string
1615
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1616
 
    
1617
 
    Assumes a gobject.MainLoop event loop.
1618
 
    """
1619
 
    def __init__(self, server_address, RequestHandlerClass,
1620
 
                 interface=None, use_ipv6=True, clients=None,
1621
 
                 gnutls_priority=None, use_dbus=True):
1622
 
        self.enabled = False
1623
 
        self.clients = clients
1624
 
        if self.clients is None:
1625
 
            self.clients = set()
1626
 
        self.use_dbus = use_dbus
1627
 
        self.gnutls_priority = gnutls_priority
1628
 
        IPv6_TCPServer.__init__(self, server_address,
1629
 
                                RequestHandlerClass,
1630
 
                                interface = interface,
1631
 
                                use_ipv6 = use_ipv6)
1632
 
    def server_activate(self):
1633
 
        if self.enabled:
1634
 
            return socketserver.TCPServer.server_activate(self)
1635
 
    
1636
 
    def enable(self):
1637
 
        self.enabled = True
1638
 
    
1639
 
    def add_pipe(self, parent_pipe, proc):
1640
 
        # Call "handle_ipc" for both data and EOF events
1641
 
        gobject.io_add_watch(parent_pipe.fileno(),
1642
 
                             gobject.IO_IN | gobject.IO_HUP,
1643
 
                             functools.partial(self.handle_ipc,
1644
 
                                               parent_pipe =
1645
 
                                               parent_pipe,
1646
 
                                               proc = proc))
1647
 
    
1648
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1649
 
                   proc = None, client_object=None):
1650
 
        condition_names = {
1651
 
            gobject.IO_IN: "IN",   # There is data to read.
1652
 
            gobject.IO_OUT: "OUT", # Data can be written (without
1653
 
                                    # blocking).
1654
 
            gobject.IO_PRI: "PRI", # There is urgent data to read.
1655
 
            gobject.IO_ERR: "ERR", # Error condition.
1656
 
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
1657
 
                                    # broken, usually for pipes and
1658
 
                                    # sockets).
1659
 
            }
1660
 
        conditions_string = ' | '.join(name
1661
 
                                       for cond, name in
1662
 
                                       condition_names.iteritems()
1663
 
                                       if cond & condition)
1664
 
        # error, or the other end of multiprocessing.Pipe has closed
1665
 
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1666
 
            # Wait for other process to exit
1667
 
            proc.join()
1668
 
            return False
1669
 
        
1670
 
        # Read a request from the child
1671
 
        request = parent_pipe.recv()
1672
 
        command = request[0]
1673
 
        
1674
 
        if command == 'init':
1675
 
            fpr = request[1]
1676
 
            address = request[2]
1677
 
            
1678
 
            for c in self.clients:
1679
 
                if c.fingerprint == fpr:
1680
 
                    client = c
1681
 
                    break
1682
 
            else:
1683
 
                logger.info("Client not found for fingerprint: %s, ad"
1684
 
                            "dress: %s", fpr, address)
1685
 
                if self.use_dbus:
1686
 
                    # Emit D-Bus signal
1687
 
                    mandos_dbus_service.ClientNotFound(fpr,
1688
 
                                                       address[0])
1689
 
                parent_pipe.send(False)
1690
 
                return False
1691
 
            
1692
 
            gobject.io_add_watch(parent_pipe.fileno(),
1693
 
                                 gobject.IO_IN | gobject.IO_HUP,
1694
 
                                 functools.partial(self.handle_ipc,
1695
 
                                                   parent_pipe =
1696
 
                                                   parent_pipe,
1697
 
                                                   proc = proc,
1698
 
                                                   client_object =
1699
 
                                                   client))
1700
 
            parent_pipe.send(True)
1701
 
            # remove the old hook in favor of the new above hook on
1702
 
            # same fileno
1703
 
            return False
1704
 
        if command == 'funcall':
1705
 
            funcname = request[1]
1706
 
            args = request[2]
1707
 
            kwargs = request[3]
1708
 
            
1709
 
            parent_pipe.send(('data', getattr(client_object,
1710
 
                                              funcname)(*args,
1711
 
                                                         **kwargs)))
1712
 
        
1713
 
        if command == 'getattr':
1714
 
            attrname = request[1]
1715
 
            if callable(client_object.__getattribute__(attrname)):
1716
 
                parent_pipe.send(('function',))
1717
 
            else:
1718
 
                parent_pipe.send(('data', client_object
1719
 
                                  .__getattribute__(attrname)))
1720
 
        
1721
 
        if command == 'setattr':
1722
 
            attrname = request[1]
1723
 
            value = request[2]
1724
 
            setattr(client_object, attrname, value)
1725
 
        
1726
 
        return True
 
408
            return super(type(self), self).server_bind()
1727
409
 
1728
410
 
1729
411
def string_to_delta(interval):
1730
412
    """Parse a string and return a datetime.timedelta
1731
 
    
 
413
 
1732
414
    >>> string_to_delta('7d')
1733
415
    datetime.timedelta(7)
1734
416
    >>> string_to_delta('60s')
1737
419
    datetime.timedelta(0, 3600)
1738
420
    >>> string_to_delta('24h')
1739
421
    datetime.timedelta(1)
1740
 
    >>> string_to_delta('1w')
 
422
    >>> string_to_delta(u'1w')
1741
423
    datetime.timedelta(7)
1742
 
    >>> string_to_delta('5m 30s')
1743
 
    datetime.timedelta(0, 330)
1744
424
    """
1745
 
    timevalue = datetime.timedelta(0)
1746
 
    for s in interval.split():
1747
 
        try:
1748
 
            suffix = unicode(s[-1])
1749
 
            value = int(s[:-1])
1750
 
            if suffix == "d":
1751
 
                delta = datetime.timedelta(value)
1752
 
            elif suffix == "s":
1753
 
                delta = datetime.timedelta(0, value)
1754
 
            elif suffix == "m":
1755
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1756
 
            elif suffix == "h":
1757
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1758
 
            elif suffix == "w":
1759
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1760
 
            else:
1761
 
                raise ValueError("Unknown suffix %r" % suffix)
1762
 
        except (ValueError, IndexError) as e:
1763
 
            raise ValueError(*(e.args))
1764
 
        timevalue += delta
1765
 
    return timevalue
 
425
    try:
 
426
        suffix=unicode(interval[-1])
 
427
        value=int(interval[:-1])
 
428
        if suffix == u"d":
 
429
            delta = datetime.timedelta(value)
 
430
        elif suffix == u"s":
 
431
            delta = datetime.timedelta(0, value)
 
432
        elif suffix == u"m":
 
433
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
434
        elif suffix == u"h":
 
435
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
436
        elif suffix == u"w":
 
437
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
438
        else:
 
439
            raise ValueError
 
440
    except (ValueError, IndexError):
 
441
        raise ValueError
 
442
    return delta
 
443
 
 
444
 
 
445
def add_service():
 
446
    """From the Avahi server example code"""
 
447
    global group, serviceName, serviceType, servicePort, serviceTXT, \
 
448
           domain, host
 
449
    if group is None:
 
450
        group = dbus.Interface(
 
451
                bus.get_object( avahi.DBUS_NAME,
 
452
                                server.EntryGroupNew()),
 
453
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
454
        group.connect_to_signal('StateChanged',
 
455
                                entry_group_state_changed)
 
456
    logger.debug(u"Adding service '%s' of type '%s' ...",
 
457
                 serviceName, serviceType)
 
458
    
 
459
    group.AddService(
 
460
            serviceInterface,           # interface
 
461
            avahi.PROTO_INET6,          # protocol
 
462
            dbus.UInt32(0),             # flags
 
463
            serviceName, serviceType,
 
464
            domain, host,
 
465
            dbus.UInt16(servicePort),
 
466
            avahi.string_array_to_txt_array(serviceTXT))
 
467
    group.Commit()
 
468
 
 
469
 
 
470
def remove_service():
 
471
    """From the Avahi server example code"""
 
472
    global group
 
473
    
 
474
    if not group is None:
 
475
        group.Reset()
 
476
 
 
477
 
 
478
def server_state_changed(state):
 
479
    """From the Avahi server example code"""
 
480
    if state == avahi.SERVER_COLLISION:
 
481
        logger.warning(u"Server name collision")
 
482
        remove_service()
 
483
    elif state == avahi.SERVER_RUNNING:
 
484
        add_service()
 
485
 
 
486
 
 
487
def entry_group_state_changed(state, error):
 
488
    """From the Avahi server example code"""
 
489
    global serviceName, server, rename_count
 
490
    
 
491
    logger.debug(u"state change: %i", state)
 
492
    
 
493
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
494
        logger.debug(u"Service established.")
 
495
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
496
        
 
497
        rename_count = rename_count - 1
 
498
        if rename_count > 0:
 
499
            name = server.GetAlternativeServiceName(name)
 
500
            logger.warning(u"Service name collision, "
 
501
                           u"changing name to '%s' ...", name)
 
502
            remove_service()
 
503
            add_service()
 
504
            
 
505
        else:
 
506
            logger.error(u"No suitable service name found "
 
507
                         u"after %i retries, exiting.",
 
508
                         n_rename)
 
509
            main_loop.quit()
 
510
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
511
        logger.error(u"Error in group state changed %s",
 
512
                     unicode(error))
 
513
        main_loop.quit()
 
514
        return
1766
515
 
1767
516
 
1768
517
def if_nametoindex(interface):
1769
 
    """Call the C function if_nametoindex(), or equivalent
1770
 
    
1771
 
    Note: This function cannot accept a unicode string."""
1772
 
    global if_nametoindex
 
518
    """Call the C function if_nametoindex()"""
1773
519
    try:
1774
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1775
 
                          (ctypes.util.find_library("c"))
1776
 
                          .if_nametoindex)
 
520
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
521
        return libc.if_nametoindex(interface)
1777
522
    except (OSError, AttributeError):
1778
 
        logger.warning("Doing if_nametoindex the hard way")
1779
 
        def if_nametoindex(interface):
1780
 
            "Get an interface index the hard way, i.e. using fcntl()"
1781
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
1782
 
            with contextlib.closing(socket.socket()) as s:
1783
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1784
 
                                    struct.pack(str("16s16x"),
1785
 
                                                interface))
1786
 
            interface_index = struct.unpack(str("I"),
1787
 
                                            ifreq[16:20])[0]
1788
 
            return interface_index
1789
 
    return if_nametoindex(interface)
1790
 
 
1791
 
 
1792
 
def daemon(nochdir = False, noclose = False):
1793
 
    """See daemon(3).  Standard BSD Unix function.
1794
 
    
1795
 
    This should really exist as os.daemon, but it doesn't (yet)."""
1796
 
    if os.fork():
1797
 
        sys.exit()
1798
 
    os.setsid()
1799
 
    if not nochdir:
1800
 
        os.chdir("/")
1801
 
    if os.fork():
1802
 
        sys.exit()
1803
 
    if not noclose:
1804
 
        # Close all standard open file descriptors
1805
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1806
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1807
 
            raise OSError(errno.ENODEV,
1808
 
                          "%s not a character device"
1809
 
                          % os.path.devnull)
1810
 
        os.dup2(null, sys.stdin.fileno())
1811
 
        os.dup2(null, sys.stdout.fileno())
1812
 
        os.dup2(null, sys.stderr.fileno())
1813
 
        if null > 2:
1814
 
            os.close(null)
1815
 
 
1816
 
 
1817
 
def main():
1818
 
    
1819
 
    ##################################################################
1820
 
    # Parsing of options, both command line and config file
1821
 
    
1822
 
    parser = argparse.ArgumentParser()
1823
 
    parser.add_argument("-v", "--version", action="version",
1824
 
                        version = "%%(prog)s %s" % version,
1825
 
                        help="show version number and exit")
1826
 
    parser.add_argument("-i", "--interface", metavar="IF",
1827
 
                        help="Bind to interface IF")
1828
 
    parser.add_argument("-a", "--address",
1829
 
                        help="Address to listen for requests on")
1830
 
    parser.add_argument("-p", "--port", type=int,
1831
 
                        help="Port number to receive requests on")
1832
 
    parser.add_argument("--check", action="store_true",
1833
 
                        help="Run self-test")
1834
 
    parser.add_argument("--debug", action="store_true",
1835
 
                        help="Debug mode; run in foreground and log"
1836
 
                        " to terminal")
1837
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
1838
 
                        help="Debug level for stdout output")
1839
 
    parser.add_argument("--priority", help="GnuTLS"
1840
 
                        " priority string (see GnuTLS documentation)")
1841
 
    parser.add_argument("--servicename",
1842
 
                        metavar="NAME", help="Zeroconf service name")
1843
 
    parser.add_argument("--configdir",
1844
 
                        default="/etc/mandos", metavar="DIR",
1845
 
                        help="Directory to search for configuration"
1846
 
                        " files")
1847
 
    parser.add_argument("--no-dbus", action="store_false",
1848
 
                        dest="use_dbus", help="Do not provide D-Bus"
1849
 
                        " system bus interface")
1850
 
    parser.add_argument("--no-ipv6", action="store_false",
1851
 
                        dest="use_ipv6", help="Do not use IPv6")
1852
 
    options = parser.parse_args()
 
523
        if "struct" not in sys.modules:
 
524
            import struct
 
525
        if "fcntl" not in sys.modules:
 
526
            import fcntl
 
527
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
528
        s = socket.socket()
 
529
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
530
                            struct.pack("16s16x", interface))
 
531
        s.close()
 
532
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
533
        return interface_index
 
534
 
 
535
 
 
536
if __name__ == '__main__':
 
537
    parser = OptionParser()
 
538
    parser.add_option("-i", "--interface", type="string",
 
539
                      default=None, metavar="IF",
 
540
                      help="Bind to interface IF")
 
541
    parser.add_option("--cert", type="string", default="cert.pem",
 
542
                      metavar="FILE",
 
543
                      help="Public key certificate PEM file to use")
 
544
    parser.add_option("--key", type="string", default="key.pem",
 
545
                      metavar="FILE",
 
546
                      help="Private key PEM file to use")
 
547
    parser.add_option("--ca", type="string", default="ca.pem",
 
548
                      metavar="FILE",
 
549
                      help="Certificate Authority certificate PEM file to use")
 
550
    parser.add_option("--crl", type="string", default="crl.pem",
 
551
                      metavar="FILE",
 
552
                      help="Certificate Revokation List PEM file to use")
 
553
    parser.add_option("-p", "--port", type="int", default=None,
 
554
                      help="Port number to receive requests on")
 
555
    parser.add_option("--timeout", type="string", # Parsed later
 
556
                      default="1h",
 
557
                      help="Amount of downtime allowed for clients")
 
558
    parser.add_option("--interval", type="string", # Parsed later
 
559
                      default="5m",
 
560
                      help="How often to check that a client is up")
 
561
    parser.add_option("--check", action="store_true", default=False,
 
562
                      help="Run self-test")
 
563
    parser.add_option("--debug", action="store_true", default=False,
 
564
                      help="Debug mode")
 
565
    (options, args) = parser.parse_args()
1853
566
    
1854
567
    if options.check:
1855
568
        import doctest
1856
569
        doctest.testmod()
1857
570
        sys.exit()
1858
571
    
1859
 
    # Default values for config file for server-global settings
1860
 
    server_defaults = { "interface": "",
1861
 
                        "address": "",
1862
 
                        "port": "",
1863
 
                        "debug": "False",
1864
 
                        "priority":
1865
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1866
 
                        "servicename": "Mandos",
1867
 
                        "use_dbus": "True",
1868
 
                        "use_ipv6": "True",
1869
 
                        "debuglevel": "",
1870
 
                        }
1871
 
    
1872
 
    # Parse config file for server-global settings
1873
 
    server_config = configparser.SafeConfigParser(server_defaults)
1874
 
    del server_defaults
1875
 
    server_config.read(os.path.join(options.configdir,
1876
 
                                    "mandos.conf"))
1877
 
    # Convert the SafeConfigParser object to a dict
1878
 
    server_settings = server_config.defaults()
1879
 
    # Use the appropriate methods on the non-string config options
1880
 
    for option in ("debug", "use_dbus", "use_ipv6"):
1881
 
        server_settings[option] = server_config.getboolean("DEFAULT",
1882
 
                                                           option)
1883
 
    if server_settings["port"]:
1884
 
        server_settings["port"] = server_config.getint("DEFAULT",
1885
 
                                                       "port")
1886
 
    del server_config
1887
 
    
1888
 
    # Override the settings from the config file with command line
1889
 
    # options, if set.
1890
 
    for option in ("interface", "address", "port", "debug",
1891
 
                   "priority", "servicename", "configdir",
1892
 
                   "use_dbus", "use_ipv6", "debuglevel"):
1893
 
        value = getattr(options, option)
1894
 
        if value is not None:
1895
 
            server_settings[option] = value
1896
 
    del options
1897
 
    # Force all strings to be unicode
1898
 
    for option in server_settings.keys():
1899
 
        if type(server_settings[option]) is str:
1900
 
            server_settings[option] = unicode(server_settings[option])
1901
 
    # Now we have our good server settings in "server_settings"
1902
 
    
1903
 
    ##################################################################
1904
 
    
1905
 
    # For convenience
1906
 
    debug = server_settings["debug"]
1907
 
    debuglevel = server_settings["debuglevel"]
1908
 
    use_dbus = server_settings["use_dbus"]
1909
 
    use_ipv6 = server_settings["use_ipv6"]
1910
 
    
1911
 
    if server_settings["servicename"] != "Mandos":
1912
 
        syslogger.setFormatter(logging.Formatter
1913
 
                               ('Mandos (%s) [%%(process)d]:'
1914
 
                                ' %%(levelname)s: %%(message)s'
1915
 
                                % server_settings["servicename"]))
1916
 
    
1917
 
    # Parse config file with clients
1918
 
    client_defaults = { "timeout": "5m",
1919
 
                        "extended_timeout": "15m",
1920
 
                        "interval": "2m",
1921
 
                        "checker": "fping -q -- %%(host)s",
1922
 
                        "host": "",
1923
 
                        "approval_delay": "0s",
1924
 
                        "approval_duration": "1s",
1925
 
                        }
1926
 
    client_config = configparser.SafeConfigParser(client_defaults)
1927
 
    client_config.read(os.path.join(server_settings["configdir"],
1928
 
                                    "clients.conf"))
1929
 
    
1930
 
    global mandos_dbus_service
1931
 
    mandos_dbus_service = None
1932
 
    
1933
 
    tcp_server = MandosServer((server_settings["address"],
1934
 
                               server_settings["port"]),
1935
 
                              ClientHandler,
1936
 
                              interface=(server_settings["interface"]
1937
 
                                         or None),
1938
 
                              use_ipv6=use_ipv6,
1939
 
                              gnutls_priority=
1940
 
                              server_settings["priority"],
1941
 
                              use_dbus=use_dbus)
1942
 
    if not debug:
1943
 
        pidfilename = "/var/run/mandos.pid"
1944
 
        try:
1945
 
            pidfile = open(pidfilename, "w")
1946
 
        except IOError:
1947
 
            logger.error("Could not open file %r", pidfilename)
1948
 
    
1949
 
    try:
1950
 
        uid = pwd.getpwnam("_mandos").pw_uid
1951
 
        gid = pwd.getpwnam("_mandos").pw_gid
1952
 
    except KeyError:
1953
 
        try:
1954
 
            uid = pwd.getpwnam("mandos").pw_uid
1955
 
            gid = pwd.getpwnam("mandos").pw_gid
1956
 
        except KeyError:
1957
 
            try:
1958
 
                uid = pwd.getpwnam("nobody").pw_uid
1959
 
                gid = pwd.getpwnam("nobody").pw_gid
1960
 
            except KeyError:
1961
 
                uid = 65534
1962
 
                gid = 65534
1963
 
    try:
1964
 
        os.setgid(gid)
1965
 
        os.setuid(uid)
1966
 
    except OSError as error:
1967
 
        if error[0] != errno.EPERM:
1968
 
            raise error
1969
 
    
1970
 
    if not debug and not debuglevel:
1971
 
        syslogger.setLevel(logging.WARNING)
1972
 
        console.setLevel(logging.WARNING)
1973
 
    if debuglevel:
1974
 
        level = getattr(logging, debuglevel.upper())
1975
 
        syslogger.setLevel(level)
1976
 
        console.setLevel(level)
1977
 
    
1978
 
    if debug:
1979
 
        # Enable all possible GnuTLS debugging
1980
 
        
1981
 
        # "Use a log level over 10 to enable all debugging options."
1982
 
        # - GnuTLS manual
1983
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1984
 
        
1985
 
        @gnutls.library.types.gnutls_log_func
1986
 
        def debug_gnutls(level, string):
1987
 
            logger.debug("GnuTLS: %s", string[:-1])
1988
 
        
1989
 
        (gnutls.library.functions
1990
 
         .gnutls_global_set_log_function(debug_gnutls))
1991
 
        
1992
 
        # Redirect stdin so all checkers get /dev/null
1993
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1994
 
        os.dup2(null, sys.stdin.fileno())
1995
 
        if null > 2:
1996
 
            os.close(null)
1997
 
    else:
1998
 
        # No console logging
1999
 
        logger.removeHandler(console)
2000
 
    
2001
 
    # Need to fork before connecting to D-Bus
2002
 
    if not debug:
2003
 
        # Close all input and output, do double fork, etc.
2004
 
        daemon()
2005
 
    
2006
 
    global main_loop
2007
 
    # From the Avahi example code
 
572
    # Parse the time arguments
 
573
    try:
 
574
        options.timeout = string_to_delta(options.timeout)
 
575
    except ValueError:
 
576
        parser.error("option --timeout: Unparseable time")
 
577
    try:
 
578
        options.interval = string_to_delta(options.interval)
 
579
    except ValueError:
 
580
        parser.error("option --interval: Unparseable time")
 
581
    
 
582
    # Parse config file
 
583
    defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
 
584
    client_config = ConfigParser.SafeConfigParser(defaults)
 
585
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
 
586
    client_config.read("mandos-clients.conf")
 
587
    
 
588
    # From the Avahi server example code
2008
589
    DBusGMainLoop(set_as_default=True )
2009
590
    main_loop = gobject.MainLoop()
2010
591
    bus = dbus.SystemBus()
2011
 
    # End of Avahi example code
2012
 
    if use_dbus:
2013
 
        try:
2014
 
            bus_name = dbus.service.BusName("se.recompile.Mandos",
2015
 
                                            bus, do_not_queue=True)
2016
 
            old_bus_name = (dbus.service.BusName
2017
 
                            ("se.bsnet.fukt.Mandos", bus,
2018
 
                             do_not_queue=True))
2019
 
        except dbus.exceptions.NameExistsException as e:
2020
 
            logger.error(unicode(e) + ", disabling D-Bus")
2021
 
            use_dbus = False
2022
 
            server_settings["use_dbus"] = False
2023
 
            tcp_server.use_dbus = False
2024
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
2025
 
    service = AvahiService(name = server_settings["servicename"],
2026
 
                           servicetype = "_mandos._tcp",
2027
 
                           protocol = protocol, bus = bus)
2028
 
    if server_settings["interface"]:
2029
 
        service.interface = (if_nametoindex
2030
 
                             (str(server_settings["interface"])))
2031
 
    
2032
 
    global multiprocessing_manager
2033
 
    multiprocessing_manager = multiprocessing.Manager()
2034
 
    
2035
 
    client_class = Client
2036
 
    if use_dbus:
2037
 
        client_class = functools.partial(ClientDBusTransitional,
2038
 
                                         bus = bus)
2039
 
    def client_config_items(config, section):
2040
 
        special_settings = {
2041
 
            "approved_by_default":
2042
 
                lambda: config.getboolean(section,
2043
 
                                          "approved_by_default"),
2044
 
            }
2045
 
        for name, value in config.items(section):
2046
 
            try:
2047
 
                yield (name, special_settings[name]())
2048
 
            except KeyError:
2049
 
                yield (name, value)
2050
 
    
2051
 
    tcp_server.clients.update(set(
2052
 
            client_class(name = section,
2053
 
                         config= dict(client_config_items(
2054
 
                        client_config, section)))
2055
 
            for section in client_config.sections()))
2056
 
    if not tcp_server.clients:
2057
 
        logger.warning("No clients defined")
2058
 
        
2059
 
    if not debug:
2060
 
        try:
2061
 
            with pidfile:
2062
 
                pid = os.getpid()
2063
 
                pidfile.write(str(pid) + "\n".encode("utf-8"))
2064
 
            del pidfile
2065
 
        except IOError:
2066
 
            logger.error("Could not write to file %r with PID %d",
2067
 
                         pidfilename, pid)
2068
 
        except NameError:
2069
 
            # "pidfile" was never created
2070
 
            pass
2071
 
        del pidfilename
2072
 
        
2073
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
2074
 
    
2075
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
2076
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
2077
 
    
2078
 
    if use_dbus:
2079
 
        class MandosDBusService(dbus.service.Object):
2080
 
            """A D-Bus proxy object"""
2081
 
            def __init__(self):
2082
 
                dbus.service.Object.__init__(self, bus, "/")
2083
 
            _interface = "se.recompile.Mandos"
2084
 
            
2085
 
            @dbus.service.signal(_interface, signature="o")
2086
 
            def ClientAdded(self, objpath):
2087
 
                "D-Bus signal"
2088
 
                pass
2089
 
            
2090
 
            @dbus.service.signal(_interface, signature="ss")
2091
 
            def ClientNotFound(self, fingerprint, address):
2092
 
                "D-Bus signal"
2093
 
                pass
2094
 
            
2095
 
            @dbus.service.signal(_interface, signature="os")
2096
 
            def ClientRemoved(self, objpath, name):
2097
 
                "D-Bus signal"
2098
 
                pass
2099
 
            
2100
 
            @dbus.service.method(_interface, out_signature="ao")
2101
 
            def GetAllClients(self):
2102
 
                "D-Bus method"
2103
 
                return dbus.Array(c.dbus_object_path
2104
 
                                  for c in tcp_server.clients)
2105
 
            
2106
 
            @dbus.service.method(_interface,
2107
 
                                 out_signature="a{oa{sv}}")
2108
 
            def GetAllClientsWithProperties(self):
2109
 
                "D-Bus method"
2110
 
                return dbus.Dictionary(
2111
 
                    ((c.dbus_object_path, c.GetAll(""))
2112
 
                     for c in tcp_server.clients),
2113
 
                    signature="oa{sv}")
2114
 
            
2115
 
            @dbus.service.method(_interface, in_signature="o")
2116
 
            def RemoveClient(self, object_path):
2117
 
                "D-Bus method"
2118
 
                for c in tcp_server.clients:
2119
 
                    if c.dbus_object_path == object_path:
2120
 
                        tcp_server.clients.remove(c)
2121
 
                        c.remove_from_connection()
2122
 
                        # Don't signal anything except ClientRemoved
2123
 
                        c.disable(quiet=True)
2124
 
                        # Emit D-Bus signal
2125
 
                        self.ClientRemoved(object_path, c.name)
2126
 
                        return
2127
 
                raise KeyError(object_path)
2128
 
            
2129
 
            del _interface
2130
 
        
2131
 
        class MandosDBusServiceTransitional(MandosDBusService):
2132
 
            __metaclass__ = AlternateDBusNamesMetaclass
2133
 
        mandos_dbus_service = MandosDBusServiceTransitional()
2134
 
    
2135
 
    def cleanup():
2136
 
        "Cleanup function; run on exit"
2137
 
        service.cleanup()
2138
 
        
2139
 
        multiprocessing.active_children()
2140
 
        while tcp_server.clients:
2141
 
            client = tcp_server.clients.pop()
2142
 
            if use_dbus:
2143
 
                client.remove_from_connection()
2144
 
            client.disable_hook = None
2145
 
            # Don't signal anything except ClientRemoved
2146
 
            client.disable(quiet=True)
2147
 
            if use_dbus:
2148
 
                # Emit D-Bus signal
2149
 
                mandos_dbus_service.ClientRemoved(client
2150
 
                                                  .dbus_object_path,
2151
 
                                                  client.name)
2152
 
    
2153
 
    atexit.register(cleanup)
2154
 
    
2155
 
    for client in tcp_server.clients:
2156
 
        if use_dbus:
2157
 
            # Emit D-Bus signal
2158
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
2159
 
        client.enable()
2160
 
    
2161
 
    tcp_server.enable()
2162
 
    tcp_server.server_activate()
2163
 
    
2164
 
    # Find out what port we got
2165
 
    service.port = tcp_server.socket.getsockname()[1]
2166
 
    if use_ipv6:
2167
 
        logger.info("Now listening on address %r, port %d,"
2168
 
                    " flowinfo %d, scope_id %d"
2169
 
                    % tcp_server.socket.getsockname())
2170
 
    else:                       # IPv4
2171
 
        logger.info("Now listening on address %r, port %d"
2172
 
                    % tcp_server.socket.getsockname())
2173
 
    
2174
 
    #service.interface = tcp_server.socket.getsockname()[3]
2175
 
    
 
592
    server = dbus.Interface(
 
593
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
594
            avahi.DBUS_INTERFACE_SERVER )
 
595
    # End of Avahi example code
 
596
    
 
597
    debug = options.debug
 
598
    
 
599
    clients = Set()
 
600
    def remove_from_clients(client):
 
601
        clients.remove(client)
 
602
        if not clients:
 
603
            logger.debug(u"No clients left, exiting")
 
604
            main_loop.quit()
 
605
    
 
606
    clients.update(Set(Client(name=section, options=options,
 
607
                              stop_hook = remove_from_clients,
 
608
                              **(dict(client_config\
 
609
                                      .items(section))))
 
610
                       for section in client_config.sections()))
 
611
    for client in clients:
 
612
        client.start()
 
613
    
 
614
    tcp_server = IPv6_TCPServer((None, options.port),
 
615
                                tcp_handler,
 
616
                                options=options,
 
617
                                clients=clients)
 
618
    # Find out what random port we got
 
619
    servicePort = tcp_server.socket.getsockname()[1]
 
620
    logger.debug(u"Now listening on port %d", servicePort)
 
621
    
 
622
    if options.interface is not None:
 
623
        serviceInterface = if_nametoindex(options.interface)
 
624
    
 
625
    # From the Avahi server example code
 
626
    server.connect_to_signal("StateChanged", server_state_changed)
 
627
    server_state_changed(server.GetState())
 
628
    # End of Avahi example code
 
629
    
 
630
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
631
                         lambda *args, **kwargs:
 
632
                         tcp_server.handle_request(*args[2:],
 
633
                                                   **kwargs) or True)
2176
634
    try:
2177
 
        # From the Avahi example code
2178
 
        try:
2179
 
            service.activate()
2180
 
        except dbus.exceptions.DBusException as error:
2181
 
            logger.critical("DBusException: %s", error)
2182
 
            cleanup()
2183
 
            sys.exit(1)
2184
 
        # End of Avahi example code
2185
 
        
2186
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2187
 
                             lambda *args, **kwargs:
2188
 
                             (tcp_server.handle_request
2189
 
                              (*args[2:], **kwargs) or True))
2190
 
        
2191
 
        logger.debug("Starting main loop")
2192
635
        main_loop.run()
2193
 
    except AvahiError as error:
2194
 
        logger.critical("AvahiError: %s", error)
2195
 
        cleanup()
2196
 
        sys.exit(1)
2197
636
    except KeyboardInterrupt:
2198
 
        if debug:
2199
 
            print("", file=sys.stderr)
2200
 
        logger.debug("Server received KeyboardInterrupt")
2201
 
    logger.debug("Server exiting")
2202
 
    # Must run before the D-Bus bus name gets deregistered
2203
 
    cleanup()
2204
 
 
2205
 
 
2206
 
if __name__ == '__main__':
2207
 
    main()
 
637
        print
 
638
    
 
639
    # Cleanup here
 
640
 
 
641
    # From the Avahi server example code
 
642
    if not group is None:
 
643
        group.Free()
 
644
    # End of Avahi example code
 
645
    
 
646
    for client in clients:
 
647
        client.stop_hook = None
 
648
        client.stop()