/mandos/release

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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@fukt.bsnet.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
24
 
66
25
import dbus
67
 
import dbus.service
68
26
import gobject
69
27
import avahi
70
28
from dbus.mainloop.glib import DBusGMainLoop
71
29
import ctypes
72
 
import ctypes.util
73
 
import xml.dom.minidom
74
 
import inspect
75
 
 
76
 
try:
77
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
78
 
except AttributeError:
79
 
    try:
80
 
        from IN import SO_BINDTODEVICE
81
 
    except ImportError:
82
 
        SO_BINDTODEVICE = None
83
 
 
84
 
 
85
 
version = "1.3.1"
86
 
 
87
 
#logger = logging.getLogger('mandos')
 
30
 
 
31
import logging
 
32
import logging.handlers
 
33
 
 
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
 
35
 
88
36
logger = logging.Logger('mandos')
89
 
syslogger = (logging.handlers.SysLogHandler
90
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
91
 
              address = str("/dev/log")))
92
 
syslogger.setFormatter(logging.Formatter
93
 
                       ('Mandos [%(process)d]: %(levelname)s:'
94
 
                        ' %(message)s'))
95
 
logger.addHandler(syslogger)
96
 
 
97
 
console = logging.StreamHandler()
98
 
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
99
 
                                       ' %(levelname)s:'
100
 
                                       ' %(message)s'))
101
 
logger.addHandler(console)
102
 
 
103
 
class AvahiError(Exception):
104
 
    def __init__(self, value, *args, **kwargs):
105
 
        self.value = value
106
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
107
 
    def __unicode__(self):
108
 
        return unicode(repr(self.value))
109
 
 
110
 
class AvahiServiceError(AvahiError):
111
 
    pass
112
 
 
113
 
class AvahiGroupError(AvahiError):
114
 
    pass
115
 
 
116
 
 
117
 
class AvahiService(object):
118
 
    """An Avahi (Zeroconf) service.
119
 
    
120
 
    Attributes:
121
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
122
 
               Used to optionally bind to the specified interface.
123
 
    name: string; Example: 'Mandos'
124
 
    type: string; Example: '_mandos._tcp'.
125
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
126
 
    port: integer; what port to announce
127
 
    TXT: list of strings; TXT record for the service
128
 
    domain: string; Domain to publish on, default to .local if empty.
129
 
    host: string; Host to publish records for, default is localhost
130
 
    max_renames: integer; maximum number of renames
131
 
    rename_count: integer; counter so we only rename after collisions
132
 
                  a sensible number of times
133
 
    group: D-Bus Entry Group
134
 
    server: D-Bus Server
135
 
    bus: dbus.SystemBus()
136
 
    """
137
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
138
 
                 servicetype = None, port = None, TXT = None,
139
 
                 domain = "", host = "", max_renames = 32768,
140
 
                 protocol = avahi.PROTO_UNSPEC, bus = None):
141
 
        self.interface = interface
142
 
        self.name = name
143
 
        self.type = servicetype
144
 
        self.port = port
145
 
        self.TXT = TXT if TXT is not None else []
146
 
        self.domain = domain
147
 
        self.host = host
148
 
        self.rename_count = 0
149
 
        self.max_renames = max_renames
150
 
        self.protocol = protocol
151
 
        self.group = None       # our entry group
152
 
        self.server = None
153
 
        self.bus = bus
154
 
        self.entry_group_state_changed_match = None
155
 
    def rename(self):
156
 
        """Derived from the Avahi example code"""
157
 
        if self.rename_count >= self.max_renames:
158
 
            logger.critical("No suitable Zeroconf service name found"
159
 
                            " after %i retries, exiting.",
160
 
                            self.rename_count)
161
 
            raise AvahiServiceError("Too many renames")
162
 
        self.name = unicode(self.server.GetAlternativeServiceName(self.name))
163
 
        logger.info("Changing Zeroconf service name to %r ...",
164
 
                    self.name)
165
 
        syslogger.setFormatter(logging.Formatter
166
 
                               ('Mandos (%s) [%%(process)d]:'
167
 
                                ' %%(levelname)s: %%(message)s'
168
 
                                % self.name))
169
 
        self.remove()
170
 
        try:
171
 
            self.add()
172
 
        except dbus.exceptions.DBusException as error:
173
 
            logger.critical("DBusException: %s", error)
174
 
            self.cleanup()
175
 
            os._exit(1)
176
 
        self.rename_count += 1
177
 
    def remove(self):
178
 
        """Derived from the Avahi example code"""
179
 
        if self.entry_group_state_changed_match is not None:
180
 
            self.entry_group_state_changed_match.remove()
181
 
            self.entry_group_state_changed_match = None
182
 
        if self.group is not None:
183
 
            self.group.Reset()
184
 
    def add(self):
185
 
        """Derived from the Avahi example code"""
186
 
        self.remove()
187
 
        if self.group is None:
188
 
            self.group = dbus.Interface(
189
 
                self.bus.get_object(avahi.DBUS_NAME,
190
 
                                    self.server.EntryGroupNew()),
191
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
192
 
        self.entry_group_state_changed_match = (
193
 
            self.group.connect_to_signal(
194
 
                'StateChanged', self .entry_group_state_changed))
195
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
196
 
                     self.name, self.type)
197
 
        self.group.AddService(
198
 
            self.interface,
199
 
            self.protocol,
200
 
            dbus.UInt32(0),     # flags
201
 
            self.name, self.type,
202
 
            self.domain, self.host,
203
 
            dbus.UInt16(self.port),
204
 
            avahi.string_array_to_txt_array(self.TXT))
205
 
        self.group.Commit()
206
 
    def entry_group_state_changed(self, state, error):
207
 
        """Derived from the Avahi example code"""
208
 
        logger.debug("Avahi entry group state change: %i", state)
209
 
        
210
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
211
 
            logger.debug("Zeroconf service established.")
212
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
213
 
            logger.info("Zeroconf service name collision.")
214
 
            self.rename()
215
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
216
 
            logger.critical("Avahi: Error in group state changed %s",
217
 
                            unicode(error))
218
 
            raise AvahiGroupError("State changed: %s"
219
 
                                  % unicode(error))
220
 
    def cleanup(self):
221
 
        """Derived from the Avahi example code"""
222
 
        if self.group is not None:
223
 
            try:
224
 
                self.group.Free()
225
 
            except (dbus.exceptions.UnknownMethodException,
226
 
                    dbus.exceptions.DBusException) as e:
227
 
                pass
228
 
            self.group = None
229
 
        self.remove()
230
 
    def server_state_changed(self, state, error=None):
231
 
        """Derived from the Avahi example code"""
232
 
        logger.debug("Avahi server state change: %i", state)
233
 
        bad_states = { avahi.SERVER_INVALID:
234
 
                           "Zeroconf server invalid",
235
 
                       avahi.SERVER_REGISTERING: None,
236
 
                       avahi.SERVER_COLLISION:
237
 
                           "Zeroconf server name collision",
238
 
                       avahi.SERVER_FAILURE:
239
 
                           "Zeroconf server failure" }
240
 
        if state in bad_states:
241
 
            if bad_states[state] is not None:
242
 
                if error is None:
243
 
                    logger.error(bad_states[state])
244
 
                else:
245
 
                    logger.error(bad_states[state] + ": %r", error)
246
 
            self.cleanup()
247
 
        elif state == avahi.SERVER_RUNNING:
248
 
            self.add()
249
 
        else:
250
 
            if error is None:
251
 
                logger.debug("Unknown state: %r", state)
252
 
            else:
253
 
                logger.debug("Unknown state: %r: %r", state, error)
254
 
    def activate(self):
255
 
        """Derived from the Avahi example code"""
256
 
        if self.server is None:
257
 
            self.server = dbus.Interface(
258
 
                self.bus.get_object(avahi.DBUS_NAME,
259
 
                                    avahi.DBUS_PATH_SERVER,
260
 
                                    follow_name_owner_changes=True),
261
 
                avahi.DBUS_INTERFACE_SERVER)
262
 
        self.server.connect_to_signal("StateChanged",
263
 
                                 self.server_state_changed)
264
 
        self.server_state_changed(self.server.GetState())
 
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
265
54
 
266
55
 
267
56
class Client(object):
268
57
    """A representation of a client host served by this server.
269
 
    
270
58
    Attributes:
271
 
    _approved:   bool(); 'None' if not yet approved/disapproved
272
 
    approval_delay: datetime.timedelta(); Time to wait for approval
273
 
    approval_duration: datetime.timedelta(); Duration of one approval
274
 
    checker:    subprocess.Popen(); a running checker process used
275
 
                                    to see if the client lives.
276
 
                                    'None' if no process is running.
277
 
    checker_callback_tag: a gobject event source tag, or None
278
 
    checker_command: string; External command which is run to check
279
 
                     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
280
78
                     runtime with vars(self) as dict, so that for
281
79
                     instance %(name)s can be used in the command.
282
 
    checker_initiator_tag: a gobject event source tag, or None
283
 
    created:    datetime.datetime(); (UTC) object creation
284
 
    current_checker_command: string; current running checker_command
285
 
    disable_hook:  If set, called by disable() as disable_hook(self)
286
 
    disable_initiator_tag: a gobject event source tag, or None
287
 
    enabled:    bool()
288
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
289
 
                 uniquely identify the client
290
 
    host:       string; available for use by the checker command
291
 
    interval:   datetime.timedelta(); How often to start a new checker
292
 
    last_approval_request: datetime.datetime(); (UTC) or None
293
 
    last_checked_ok: datetime.datetime(); (UTC) or None
294
 
    last_enabled: datetime.datetime(); (UTC)
295
 
    name:       string; from the config file, used in log messages and
296
 
                        D-Bus identifiers
297
 
    secret:     bytestring; sent verbatim (over TLS) to client
298
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
299
 
                                      until this client is disabled
300
 
    extended_timeout:   extra long timeout when password has been sent
301
 
    runtime_expansions: Allowed attributes for runtime expansion.
302
 
    expires:    datetime.datetime(); time (UTC) when a client will be
303
 
                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: - '' -
304
85
    """
305
 
    
306
 
    runtime_expansions = ("approval_delay", "approval_duration",
307
 
                          "created", "enabled", "fingerprint",
308
 
                          "host", "interval", "last_checked_ok",
309
 
                          "last_enabled", "name", "timeout")
310
 
    
311
 
    @staticmethod
312
 
    def _timedelta_to_milliseconds(td):
313
 
        "Convert a datetime.timedelta() to milliseconds"
314
 
        return ((td.days * 24 * 60 * 60 * 1000)
315
 
                + (td.seconds * 1000)
316
 
                + (td.microseconds // 1000))
317
 
    
318
 
    def timeout_milliseconds(self):
319
 
        "Return the 'timeout' attribute in milliseconds"
320
 
        return self._timedelta_to_milliseconds(self.timeout)
321
 
 
322
 
    def extended_timeout_milliseconds(self):
323
 
        "Return the 'extended_timeout' attribute in milliseconds"
324
 
        return self._timedelta_to_milliseconds(self.extended_timeout)    
325
 
    
326
 
    def interval_milliseconds(self):
327
 
        "Return the 'interval' attribute in milliseconds"
328
 
        return self._timedelta_to_milliseconds(self.interval)
329
 
 
330
 
    def approval_delay_milliseconds(self):
331
 
        return self._timedelta_to_milliseconds(self.approval_delay)
332
 
    
333
 
    def __init__(self, name = None, disable_hook=None, config=None):
334
 
        """Note: the 'checker' key in 'config' sets the
335
 
        'checker_command' attribute and *not* the 'checker'
336
 
        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):
337
112
        self.name = name
338
 
        if config is None:
339
 
            config = {}
340
 
        logger.debug("Creating client %r", self.name)
341
 
        # Uppercase and remove spaces from fingerprint for later
342
 
        # comparison purposes with return value from the fingerprint()
343
 
        # function
344
 
        self.fingerprint = (config["fingerprint"].upper()
345
 
                            .replace(" ", ""))
346
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
347
 
        if "secret" in config:
348
 
            self.secret = config["secret"].decode("base64")
349
 
        elif "secfile" in config:
350
 
            with open(os.path.expanduser(os.path.expandvars
351
 
                                         (config["secfile"])),
352
 
                      "rb") as secfile:
353
 
                self.secret = secfile.read()
354
 
        else:
355
 
            raise TypeError("No secret or secfile for client %s"
356
 
                            % self.name)
357
 
        self.host = config.get("host", "")
358
 
        self.created = datetime.datetime.utcnow()
359
 
        self.enabled = False
360
 
        self.last_approval_request = None
361
 
        self.last_enabled = None
362
 
        self.last_checked_ok = None
363
 
        self.timeout = string_to_delta(config["timeout"])
364
 
        self.extended_timeout = string_to_delta(config["extended_timeout"])
365
 
        self.interval = string_to_delta(config["interval"])
366
 
        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
367
138
        self.checker = None
368
139
        self.checker_initiator_tag = None
369
 
        self.disable_initiator_tag = None
370
 
        self.expires = None
 
140
        self.stop_initiator_tag = None
371
141
        self.checker_callback_tag = None
372
 
        self.checker_command = config["checker"]
373
 
        self.current_checker_command = None
374
 
        self.last_connect = None
375
 
        self._approved = None
376
 
        self.approved_by_default = config.get("approved_by_default",
377
 
                                              True)
378
 
        self.approvals_pending = 0
379
 
        self.approval_delay = string_to_delta(
380
 
            config["approval_delay"])
381
 
        self.approval_duration = string_to_delta(
382
 
            config["approval_duration"])
383
 
        self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
384
 
    
385
 
    def send_changedstate(self):
386
 
        self.changedstate.acquire()
387
 
        self.changedstate.notify_all()
388
 
        self.changedstate.release()
389
 
        
390
 
    def enable(self):
391
 
        """Start this client's checker and timeout hooks"""
392
 
        if getattr(self, "enabled", False):
393
 
            # Already enabled
394
 
            return
395
 
        self.send_changedstate()
396
 
        self.last_enabled = datetime.datetime.utcnow()
 
142
        self.check_command = checker
 
143
    def start(self):
 
144
        """Start this clients checker and timeout hooks"""
397
145
        # Schedule a new checker to be started an 'interval' from now,
398
146
        # and every interval from then on.
399
 
        self.checker_initiator_tag = (gobject.timeout_add
400
 
                                      (self.interval_milliseconds(),
401
 
                                       self.start_checker))
402
 
        # Schedule a disable() when 'timeout' has passed
403
 
        self.expires = datetime.datetime.utcnow() + self.timeout
404
 
        self.disable_initiator_tag = (gobject.timeout_add
405
 
                                   (self.timeout_milliseconds(),
406
 
                                    self.disable))
407
 
        self.enabled = True
 
147
        self.checker_initiator_tag = gobject.timeout_add\
 
148
                                     (self._interval_milliseconds,
 
149
                                      self.start_checker)
408
150
        # Also start a new checker *right now*.
409
151
        self.start_checker()
410
 
    
411
 
    def disable(self, quiet=True):
412
 
        """Disable this client."""
413
 
        if not getattr(self, "enabled", False):
414
 
            return False
415
 
        if not quiet:
416
 
            self.send_changedstate()
417
 
        if not quiet:
418
 
            logger.info("Disabling client %s", self.name)
419
 
        if getattr(self, "disable_initiator_tag", False):
420
 
            gobject.source_remove(self.disable_initiator_tag)
421
 
            self.disable_initiator_tag = None
422
 
        self.expires = None
423
 
        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:
424
166
            gobject.source_remove(self.checker_initiator_tag)
425
167
            self.checker_initiator_tag = None
426
168
        self.stop_checker()
427
 
        if self.disable_hook:
428
 
            self.disable_hook(self)
429
 
        self.enabled = False
 
169
        if self.stop_hook:
 
170
            self.stop_hook(self)
430
171
        # Do not run this again if called by a gobject.timeout_add
431
172
        return False
432
 
    
433
173
    def __del__(self):
434
 
        self.disable_hook = None
435
 
        self.disable()
436
 
    
437
 
    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):
438
185
        """The checker has completed, so take appropriate actions."""
439
 
        self.checker_callback_tag = None
440
 
        self.checker = None
441
 
        if os.WIFEXITED(condition):
442
 
            exitstatus = os.WEXITSTATUS(condition)
443
 
            if exitstatus == 0:
444
 
                logger.info("Checker for %(name)s succeeded",
445
 
                            vars(self))
446
 
                self.checked_ok()
447
 
            else:
448
 
                logger.info("Checker for %(name)s failed",
449
 
                            vars(self))
450
 
        else:
451
 
            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?",
452
198
                           vars(self))
453
 
    
454
 
    def checked_ok(self, timeout=None):
455
 
        """Bump up the timeout for this client.
456
 
        
457
 
        This should only be called when the client has been seen,
458
 
        alive and well.
459
 
        """
460
 
        if timeout is None:
461
 
            timeout = self.timeout
462
 
        self.last_checked_ok = datetime.datetime.utcnow()
463
 
        gobject.source_remove(self.disable_initiator_tag)
464
 
        self.expires = datetime.datetime.utcnow() + timeout
465
 
        self.disable_initiator_tag = (gobject.timeout_add
466
 
                                      (self._timedelta_to_milliseconds(timeout),
467
 
                                       self.disable))
468
 
    
469
 
    def need_approval(self):
470
 
        self.last_approval_request = datetime.datetime.utcnow()
471
 
    
 
199
        else:
 
200
            logger.debug(u"Checker for %(name)s failed",
 
201
                         vars(self))
 
202
            self.checker = None
 
203
        self.checker_callback_tag = None
472
204
    def start_checker(self):
473
205
        """Start a new checker subprocess if one is not running.
474
 
        
475
206
        If a checker already exists, leave it running and do
476
207
        nothing."""
477
 
        # The reason for not killing a running checker is that if we
478
 
        # did that, then if a checker (for some reason) started
479
 
        # running slowly and taking more than 'interval' time, the
480
 
        # client would inevitably timeout, since no checker would get
481
 
        # a chance to run to completion.  If we instead leave running
482
 
        # checkers alone, the checker would have to take more time
483
 
        # than 'timeout' for the client to be disabled, which is as it
484
 
        # should be.
485
 
        
486
 
        # If a checker exists, make sure it is not a zombie
487
 
        try:
488
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
489
 
        except (AttributeError, OSError) as error:
490
 
            if (isinstance(error, OSError)
491
 
                and error.errno != errno.ECHILD):
492
 
                raise error
493
 
        else:
494
 
            if pid:
495
 
                logger.warning("Checker was a zombie")
496
 
                gobject.source_remove(self.checker_callback_tag)
497
 
                self.checker_callback(pid, status,
498
 
                                      self.current_checker_command)
499
 
        # Start a new checker if needed
500
208
        if self.checker is None:
 
209
            logger.debug(u"Starting checker for %s",
 
210
                         self.name)
501
211
            try:
502
 
                # In case checker_command has exactly one % operator
503
 
                command = self.checker_command % self.host
 
212
                command = self.check_command % self.fqdn
504
213
            except TypeError:
505
 
                # Escape attributes for the shell
506
 
                escaped_attrs = dict(
507
 
                    (attr,
508
 
                     re.escape(unicode(str(getattr(self, attr, "")),
509
 
                                       errors=
510
 
                                       'replace')))
511
 
                    for attr in
512
 
                    self.runtime_expansions)
513
 
 
 
214
                escaped_attrs = dict((key, re.escape(str(val)))
 
215
                                     for key, val in
 
216
                                     vars(self).iteritems())
514
217
                try:
515
 
                    command = self.checker_command % escaped_attrs
516
 
                except TypeError as error:
517
 
                    logger.error('Could not format string "%s":'
518
 
                                 ' %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)
519
222
                    return True # Try again later
520
 
            self.current_checker_command = command
521
223
            try:
522
 
                logger.info("Starting checker %r for %s",
523
 
                            command, self.name)
524
 
                # We don't need to redirect stdout and stderr, since
525
 
                # in normal mode, that is already done by daemon(),
526
 
                # and in debug mode we don't want to.  (Stdin is
527
 
                # always replaced by /dev/null.)
528
 
                self.checker = subprocess.Popen(command,
529
 
                                                close_fds=True,
530
 
                                                shell=True, cwd="/")
531
 
                self.checker_callback_tag = (gobject.child_watch_add
532
 
                                             (self.checker.pid,
533
 
                                              self.checker_callback,
534
 
                                              data=command))
535
 
                # The checker may have completed before the gobject
536
 
                # watch was added.  Check for this.
537
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
538
 
                if pid:
539
 
                    gobject.source_remove(self.checker_callback_tag)
540
 
                    self.checker_callback(pid, status, command)
541
 
            except OSError as error:
542
 
                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",
543
235
                             error)
544
236
        # Re-run this periodically if run by gobject.timeout_add
545
237
        return True
546
 
    
547
238
    def stop_checker(self):
548
239
        """Force the checker process, if any, to stop."""
549
 
        if self.checker_callback_tag:
550
 
            gobject.source_remove(self.checker_callback_tag)
551
 
            self.checker_callback_tag = None
552
 
        if getattr(self, "checker", None) is None:
 
240
        if not hasattr(self, "checker") or self.checker is None:
553
241
            return
554
 
        logger.debug("Stopping checker for %(name)s", vars(self))
555
 
        try:
556
 
            os.kill(self.checker.pid, signal.SIGTERM)
557
 
            #time.sleep(0.5)
558
 
            #if self.checker.poll() is None:
559
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
560
 
        except OSError as error:
561
 
            if error.errno != errno.ESRCH: # No such process
562
 
                raise
563
 
        self.checker = None
564
 
 
565
 
def dbus_service_property(dbus_interface, signature="v",
566
 
                          access="readwrite", byte_arrays=False):
567
 
    """Decorators for marking methods of a DBusObjectWithProperties to
568
 
    become properties on the D-Bus.
569
 
    
570
 
    The decorated method will be called with no arguments by "Get"
571
 
    and with one argument by "Set".
572
 
    
573
 
    The parameters, where they are supported, are the same as
574
 
    dbus.service.method, except there is only "signature", since the
575
 
    type from Get() and the type sent to Set() is the same.
576
 
    """
577
 
    # Encoding deeply encoded byte arrays is not supported yet by the
578
 
    # "Set" method, so we fail early here:
579
 
    if byte_arrays and signature != "ay":
580
 
        raise ValueError("Byte arrays not supported for non-'ay'"
581
 
                         " signature %r" % signature)
582
 
    def decorator(func):
583
 
        func._dbus_is_property = True
584
 
        func._dbus_interface = dbus_interface
585
 
        func._dbus_signature = signature
586
 
        func._dbus_access = access
587
 
        func._dbus_name = func.__name__
588
 
        if func._dbus_name.endswith("_dbus_property"):
589
 
            func._dbus_name = func._dbus_name[:-14]
590
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
591
 
        return func
592
 
    return decorator
593
 
 
594
 
 
595
 
class DBusPropertyException(dbus.exceptions.DBusException):
596
 
    """A base class for D-Bus property-related exceptions
597
 
    """
598
 
    def __unicode__(self):
599
 
        return unicode(str(self))
600
 
 
601
 
 
602
 
class DBusPropertyAccessException(DBusPropertyException):
603
 
    """A property's access permissions disallows an operation.
604
 
    """
605
 
    pass
606
 
 
607
 
 
608
 
class DBusPropertyNotFound(DBusPropertyException):
609
 
    """An attempt was made to access a non-existing property.
610
 
    """
611
 
    pass
612
 
 
613
 
 
614
 
class DBusObjectWithProperties(dbus.service.Object):
615
 
    """A D-Bus object with properties.
616
 
 
617
 
    Classes inheriting from this can use the dbus_service_property
618
 
    decorator to expose methods as D-Bus properties.  It exposes the
619
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
620
 
    """
621
 
    
622
 
    @staticmethod
623
 
    def _is_dbus_property(obj):
624
 
        return getattr(obj, "_dbus_is_property", False)
625
 
    
626
 
    def _get_all_dbus_properties(self):
627
 
        """Returns a generator of (name, attribute) pairs
628
 
        """
629
 
        return ((prop._dbus_name, prop)
630
 
                for name, prop in
631
 
                inspect.getmembers(self, self._is_dbus_property))
632
 
    
633
 
    def _get_dbus_property(self, interface_name, property_name):
634
 
        """Returns a bound method if one exists which is a D-Bus
635
 
        property with the specified name and interface.
636
 
        """
637
 
        for name in (property_name,
638
 
                     property_name + "_dbus_property"):
639
 
            prop = getattr(self, name, None)
640
 
            if (prop is None
641
 
                or not self._is_dbus_property(prop)
642
 
                or prop._dbus_name != property_name
643
 
                or (interface_name and prop._dbus_interface
644
 
                    and interface_name != prop._dbus_interface)):
645
 
                continue
646
 
            return prop
647
 
        # No such property
648
 
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
649
 
                                   + interface_name + "."
650
 
                                   + property_name)
651
 
    
652
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
653
 
                         out_signature="v")
654
 
    def Get(self, interface_name, property_name):
655
 
        """Standard D-Bus property Get() method, see D-Bus standard.
656
 
        """
657
 
        prop = self._get_dbus_property(interface_name, property_name)
658
 
        if prop._dbus_access == "write":
659
 
            raise DBusPropertyAccessException(property_name)
660
 
        value = prop()
661
 
        if not hasattr(value, "variant_level"):
662
 
            return value
663
 
        return type(value)(value, variant_level=value.variant_level+1)
664
 
    
665
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
666
 
    def Set(self, interface_name, property_name, value):
667
 
        """Standard D-Bus property Set() method, see D-Bus standard.
668
 
        """
669
 
        prop = self._get_dbus_property(interface_name, property_name)
670
 
        if prop._dbus_access == "read":
671
 
            raise DBusPropertyAccessException(property_name)
672
 
        if prop._dbus_get_args_options["byte_arrays"]:
673
 
            # The byte_arrays option is not supported yet on
674
 
            # signatures other than "ay".
675
 
            if prop._dbus_signature != "ay":
676
 
                raise ValueError
677
 
            value = dbus.ByteArray(''.join(unichr(byte)
678
 
                                           for byte in value))
679
 
        prop(value)
680
 
    
681
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
682
 
                         out_signature="a{sv}")
683
 
    def GetAll(self, interface_name):
684
 
        """Standard D-Bus property GetAll() method, see D-Bus
685
 
        standard.
686
 
 
687
 
        Note: Will not include properties with access="write".
688
 
        """
689
 
        all = {}
690
 
        for name, prop in self._get_all_dbus_properties():
691
 
            if (interface_name
692
 
                and interface_name != prop._dbus_interface):
693
 
                # Interface non-empty but did not match
694
 
                continue
695
 
            # Ignore write-only properties
696
 
            if prop._dbus_access == "write":
697
 
                continue
698
 
            value = prop()
699
 
            if not hasattr(value, "variant_level"):
700
 
                all[name] = value
701
 
                continue
702
 
            all[name] = type(value)(value, variant_level=
703
 
                                    value.variant_level+1)
704
 
        return dbus.Dictionary(all, signature="sv")
705
 
    
706
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
707
 
                         out_signature="s",
708
 
                         path_keyword='object_path',
709
 
                         connection_keyword='connection')
710
 
    def Introspect(self, object_path, connection):
711
 
        """Standard D-Bus method, overloaded to insert property tags.
712
 
        """
713
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
714
 
                                                   connection)
715
 
        try:
716
 
            document = xml.dom.minidom.parseString(xmlstring)
717
 
            def make_tag(document, name, prop):
718
 
                e = document.createElement("property")
719
 
                e.setAttribute("name", name)
720
 
                e.setAttribute("type", prop._dbus_signature)
721
 
                e.setAttribute("access", prop._dbus_access)
722
 
                return e
723
 
            for if_tag in document.getElementsByTagName("interface"):
724
 
                for tag in (make_tag(document, name, prop)
725
 
                            for name, prop
726
 
                            in self._get_all_dbus_properties()
727
 
                            if prop._dbus_interface
728
 
                            == if_tag.getAttribute("name")):
729
 
                    if_tag.appendChild(tag)
730
 
                # Add the names to the return values for the
731
 
                # "org.freedesktop.DBus.Properties" methods
732
 
                if (if_tag.getAttribute("name")
733
 
                    == "org.freedesktop.DBus.Properties"):
734
 
                    for cn in if_tag.getElementsByTagName("method"):
735
 
                        if cn.getAttribute("name") == "Get":
736
 
                            for arg in cn.getElementsByTagName("arg"):
737
 
                                if (arg.getAttribute("direction")
738
 
                                    == "out"):
739
 
                                    arg.setAttribute("name", "value")
740
 
                        elif cn.getAttribute("name") == "GetAll":
741
 
                            for arg in cn.getElementsByTagName("arg"):
742
 
                                if (arg.getAttribute("direction")
743
 
                                    == "out"):
744
 
                                    arg.setAttribute("name", "props")
745
 
            xmlstring = document.toxml("utf-8")
746
 
            document.unlink()
747
 
        except (AttributeError, xml.dom.DOMException,
748
 
                xml.parsers.expat.ExpatError) as error:
749
 
            logger.error("Failed to override Introspection method",
750
 
                         error)
751
 
        return xmlstring
752
 
 
753
 
 
754
 
class ClientDBus(Client, DBusObjectWithProperties):
755
 
    """A Client class using D-Bus
756
 
    
757
 
    Attributes:
758
 
    dbus_object_path: dbus.ObjectPath
759
 
    bus: dbus.SystemBus()
760
 
    """
761
 
    
762
 
    runtime_expansions = (Client.runtime_expansions
763
 
                          + ("dbus_object_path",))
764
 
    
765
 
    # dbus.service.Object doesn't use super(), so we can't either.
766
 
    
767
 
    def __init__(self, bus = None, *args, **kwargs):
768
 
        self._approvals_pending = 0
769
 
        self.bus = bus
770
 
        Client.__init__(self, *args, **kwargs)
771
 
        # Only now, when this client is initialized, can it show up on
772
 
        # the D-Bus
773
 
        client_object_name = unicode(self.name).translate(
774
 
            {ord("."): ord("_"),
775
 
             ord("-"): ord("_")})
776
 
        self.dbus_object_path = (dbus.ObjectPath
777
 
                                 ("/clients/" + client_object_name))
778
 
        DBusObjectWithProperties.__init__(self, self.bus,
779
 
                                          self.dbus_object_path)
780
 
    def _set_expires(self, value):
781
 
        old_value = getattr(self, "_expires", None)
782
 
        self._expires = value
783
 
        if hasattr(self, "dbus_object_path") and old_value != value:
784
 
            dbus_time = (self._datetime_to_dbus(self._expires,
785
 
                                                variant_level=1))
786
 
            self.PropertyChanged(dbus.String("Expires"),
787
 
                                 dbus_time)
788
 
    expires = property(lambda self: self._expires, _set_expires)
789
 
    del _set_expires
790
 
        
791
 
    def _get_approvals_pending(self):
792
 
        return self._approvals_pending
793
 
    def _set_approvals_pending(self, value):
794
 
        old_value = self._approvals_pending
795
 
        self._approvals_pending = value
796
 
        bval = bool(value)
797
 
        if (hasattr(self, "dbus_object_path")
798
 
            and bval is not bool(old_value)):
799
 
            dbus_bool = dbus.Boolean(bval, variant_level=1)
800
 
            self.PropertyChanged(dbus.String("ApprovalPending"),
801
 
                                 dbus_bool)
802
 
 
803
 
    approvals_pending = property(_get_approvals_pending,
804
 
                                 _set_approvals_pending)
805
 
    del _get_approvals_pending, _set_approvals_pending
806
 
    
807
 
    @staticmethod
808
 
    def _datetime_to_dbus(dt, variant_level=0):
809
 
        """Convert a UTC datetime.datetime() to a D-Bus type."""
810
 
        if dt is None:
811
 
            return dbus.String("", variant_level = variant_level)
812
 
        return dbus.String(dt.isoformat(),
813
 
                           variant_level=variant_level)
814
 
    
815
 
    def enable(self):
816
 
        oldstate = getattr(self, "enabled", False)
817
 
        r = Client.enable(self)
818
 
        if oldstate != self.enabled:
819
 
            # Emit D-Bus signals
820
 
            self.PropertyChanged(dbus.String("Enabled"),
821
 
                                 dbus.Boolean(True, variant_level=1))
822
 
            self.PropertyChanged(
823
 
                dbus.String("LastEnabled"),
824
 
                self._datetime_to_dbus(self.last_enabled,
825
 
                                       variant_level=1))
826
 
        return r
827
 
    
828
 
    def disable(self, quiet = False):
829
 
        oldstate = getattr(self, "enabled", False)
830
 
        r = Client.disable(self, quiet=quiet)
831
 
        if not quiet and oldstate != self.enabled:
832
 
            # Emit D-Bus signal
833
 
            self.PropertyChanged(dbus.String("Enabled"),
834
 
                                 dbus.Boolean(False, variant_level=1))
835
 
        return r
836
 
    
837
 
    def __del__(self, *args, **kwargs):
838
 
        try:
839
 
            self.remove_from_connection()
840
 
        except LookupError:
841
 
            pass
842
 
        if hasattr(DBusObjectWithProperties, "__del__"):
843
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
844
 
        Client.__del__(self, *args, **kwargs)
845
 
    
846
 
    def checker_callback(self, pid, condition, command,
847
 
                         *args, **kwargs):
 
242
        gobject.source_remove(self.checker_callback_tag)
848
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)
849
247
        self.checker = None
850
 
        # Emit D-Bus signal
851
 
        self.PropertyChanged(dbus.String("CheckerRunning"),
852
 
                             dbus.Boolean(False, variant_level=1))
853
 
        if os.WIFEXITED(condition):
854
 
            exitstatus = os.WEXITSTATUS(condition)
855
 
            # Emit D-Bus signal
856
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
857
 
                                  dbus.Int64(condition),
858
 
                                  dbus.String(command))
859
 
        else:
860
 
            # Emit D-Bus signal
861
 
            self.CheckerCompleted(dbus.Int16(-1),
862
 
                                  dbus.Int64(condition),
863
 
                                  dbus.String(command))
864
 
        
865
 
        return Client.checker_callback(self, pid, condition, command,
866
 
                                       *args, **kwargs)
867
 
    
868
 
    def checked_ok(self, *args, **kwargs):
869
 
        Client.checked_ok(self, *args, **kwargs)
870
 
        # Emit D-Bus signal
871
 
        self.PropertyChanged(
872
 
            dbus.String("LastCheckedOK"),
873
 
            (self._datetime_to_dbus(self.last_checked_ok,
874
 
                                    variant_level=1)))
875
 
    
876
 
    def need_approval(self, *args, **kwargs):
877
 
        r = Client.need_approval(self, *args, **kwargs)
878
 
        # Emit D-Bus signal
879
 
        self.PropertyChanged(
880
 
            dbus.String("LastApprovalRequest"),
881
 
            (self._datetime_to_dbus(self.last_approval_request,
882
 
                                    variant_level=1)))
883
 
        return r
884
 
    
885
 
    def start_checker(self, *args, **kwargs):
886
 
        old_checker = self.checker
887
 
        if self.checker is not None:
888
 
            old_checker_pid = self.checker.pid
889
 
        else:
890
 
            old_checker_pid = None
891
 
        r = Client.start_checker(self, *args, **kwargs)
892
 
        # Only if new checker process was started
893
 
        if (self.checker is not None
894
 
            and old_checker_pid != self.checker.pid):
895
 
            # Emit D-Bus signal
896
 
            self.CheckerStarted(self.current_checker_command)
897
 
            self.PropertyChanged(
898
 
                dbus.String("CheckerRunning"),
899
 
                dbus.Boolean(True, variant_level=1))
900
 
        return r
901
 
    
902
 
    def stop_checker(self, *args, **kwargs):
903
 
        old_checker = getattr(self, "checker", None)
904
 
        r = Client.stop_checker(self, *args, **kwargs)
905
 
        if (old_checker is not None
906
 
            and getattr(self, "checker", None) is None):
907
 
            self.PropertyChanged(dbus.String("CheckerRunning"),
908
 
                                 dbus.Boolean(False, variant_level=1))
909
 
        return r
910
 
 
911
 
    def _reset_approved(self):
912
 
        self._approved = None
913
 
        return False
914
 
    
915
 
    def approve(self, value=True):
916
 
        self.send_changedstate()
917
 
        self._approved = value
918
 
        gobject.timeout_add(self._timedelta_to_milliseconds
919
 
                            (self.approval_duration),
920
 
                            self._reset_approved)
921
 
    
922
 
    
923
 
    ## D-Bus methods, signals & properties
924
 
    _interface = "se.bsnet.fukt.Mandos.Client"
925
 
    
926
 
    ## Signals
927
 
    
928
 
    # CheckerCompleted - signal
929
 
    @dbus.service.signal(_interface, signature="nxs")
930
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
931
 
        "D-Bus signal"
932
 
        pass
933
 
    
934
 
    # CheckerStarted - signal
935
 
    @dbus.service.signal(_interface, signature="s")
936
 
    def CheckerStarted(self, command):
937
 
        "D-Bus signal"
938
 
        pass
939
 
    
940
 
    # PropertyChanged - signal
941
 
    @dbus.service.signal(_interface, signature="sv")
942
 
    def PropertyChanged(self, property, value):
943
 
        "D-Bus signal"
944
 
        pass
945
 
    
946
 
    # GotSecret - signal
947
 
    @dbus.service.signal(_interface)
948
 
    def GotSecret(self):
949
 
        """D-Bus signal
950
 
        Is sent after a successful transfer of secret from the Mandos
951
 
        server to mandos-client
952
 
        """
953
 
        pass
954
 
    
955
 
    # Rejected - signal
956
 
    @dbus.service.signal(_interface, signature="s")
957
 
    def Rejected(self, reason):
958
 
        "D-Bus signal"
959
 
        pass
960
 
    
961
 
    # NeedApproval - signal
962
 
    @dbus.service.signal(_interface, signature="tb")
963
 
    def NeedApproval(self, timeout, default):
964
 
        "D-Bus signal"
965
 
        return self.need_approval()
966
 
    
967
 
    ## Methods
968
 
    
969
 
    # Approve - method
970
 
    @dbus.service.method(_interface, in_signature="b")
971
 
    def Approve(self, value):
972
 
        self.approve(value)
973
 
    
974
 
    # CheckedOK - method
975
 
    @dbus.service.method(_interface)
976
 
    def CheckedOK(self):
977
 
        self.checked_ok()
978
 
    
979
 
    # Enable - method
980
 
    @dbus.service.method(_interface)
981
 
    def Enable(self):
982
 
        "D-Bus method"
983
 
        self.enable()
984
 
    
985
 
    # StartChecker - method
986
 
    @dbus.service.method(_interface)
987
 
    def StartChecker(self):
988
 
        "D-Bus method"
989
 
        self.start_checker()
990
 
    
991
 
    # Disable - method
992
 
    @dbus.service.method(_interface)
993
 
    def Disable(self):
994
 
        "D-Bus method"
995
 
        self.disable()
996
 
    
997
 
    # StopChecker - method
998
 
    @dbus.service.method(_interface)
999
 
    def StopChecker(self):
1000
 
        self.stop_checker()
1001
 
    
1002
 
    ## Properties
1003
 
    
1004
 
    # ApprovalPending - property
1005
 
    @dbus_service_property(_interface, signature="b", access="read")
1006
 
    def ApprovalPending_dbus_property(self):
1007
 
        return dbus.Boolean(bool(self.approvals_pending))
1008
 
    
1009
 
    # ApprovedByDefault - property
1010
 
    @dbus_service_property(_interface, signature="b",
1011
 
                           access="readwrite")
1012
 
    def ApprovedByDefault_dbus_property(self, value=None):
1013
 
        if value is None:       # get
1014
 
            return dbus.Boolean(self.approved_by_default)
1015
 
        old_value = self.approved_by_default
1016
 
        self.approved_by_default = bool(value)
1017
 
        # Emit D-Bus signal
1018
 
        if old_value != self.approved_by_default:
1019
 
            self.PropertyChanged(dbus.String("ApprovedByDefault"),
1020
 
                                 dbus.Boolean(value, variant_level=1))
1021
 
    
1022
 
    # ApprovalDelay - property
1023
 
    @dbus_service_property(_interface, signature="t",
1024
 
                           access="readwrite")
1025
 
    def ApprovalDelay_dbus_property(self, value=None):
1026
 
        if value is None:       # get
1027
 
            return dbus.UInt64(self.approval_delay_milliseconds())
1028
 
        old_value = self.approval_delay
1029
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
1030
 
        # Emit D-Bus signal
1031
 
        if old_value != self.approval_delay:
1032
 
            self.PropertyChanged(dbus.String("ApprovalDelay"),
1033
 
                                 dbus.UInt64(value, variant_level=1))
1034
 
    
1035
 
    # ApprovalDuration - property
1036
 
    @dbus_service_property(_interface, signature="t",
1037
 
                           access="readwrite")
1038
 
    def ApprovalDuration_dbus_property(self, value=None):
1039
 
        if value is None:       # get
1040
 
            return dbus.UInt64(self._timedelta_to_milliseconds(
1041
 
                    self.approval_duration))
1042
 
        old_value = self.approval_duration
1043
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
1044
 
        # Emit D-Bus signal
1045
 
        if old_value != self.approval_duration:
1046
 
            self.PropertyChanged(dbus.String("ApprovalDuration"),
1047
 
                                 dbus.UInt64(value, variant_level=1))
1048
 
    
1049
 
    # Name - property
1050
 
    @dbus_service_property(_interface, signature="s", access="read")
1051
 
    def Name_dbus_property(self):
1052
 
        return dbus.String(self.name)
1053
 
    
1054
 
    # Fingerprint - property
1055
 
    @dbus_service_property(_interface, signature="s", access="read")
1056
 
    def Fingerprint_dbus_property(self):
1057
 
        return dbus.String(self.fingerprint)
1058
 
    
1059
 
    # Host - property
1060
 
    @dbus_service_property(_interface, signature="s",
1061
 
                           access="readwrite")
1062
 
    def Host_dbus_property(self, value=None):
1063
 
        if value is None:       # get
1064
 
            return dbus.String(self.host)
1065
 
        old_value = self.host
1066
 
        self.host = value
1067
 
        # Emit D-Bus signal
1068
 
        if old_value != self.host:
1069
 
            self.PropertyChanged(dbus.String("Host"),
1070
 
                                 dbus.String(value, variant_level=1))
1071
 
    
1072
 
    # Created - property
1073
 
    @dbus_service_property(_interface, signature="s", access="read")
1074
 
    def Created_dbus_property(self):
1075
 
        return dbus.String(self._datetime_to_dbus(self.created))
1076
 
    
1077
 
    # LastEnabled - property
1078
 
    @dbus_service_property(_interface, signature="s", access="read")
1079
 
    def LastEnabled_dbus_property(self):
1080
 
        return self._datetime_to_dbus(self.last_enabled)
1081
 
    
1082
 
    # Enabled - property
1083
 
    @dbus_service_property(_interface, signature="b",
1084
 
                           access="readwrite")
1085
 
    def Enabled_dbus_property(self, value=None):
1086
 
        if value is None:       # get
1087
 
            return dbus.Boolean(self.enabled)
1088
 
        if value:
1089
 
            self.enable()
1090
 
        else:
1091
 
            self.disable()
1092
 
    
1093
 
    # LastCheckedOK - property
1094
 
    @dbus_service_property(_interface, signature="s",
1095
 
                           access="readwrite")
1096
 
    def LastCheckedOK_dbus_property(self, value=None):
1097
 
        if value is not None:
1098
 
            self.checked_ok()
1099
 
            return
1100
 
        return self._datetime_to_dbus(self.last_checked_ok)
1101
 
    
1102
 
    # Expires - property
1103
 
    @dbus_service_property(_interface, signature="s", access="read")
1104
 
    def Expires_dbus_property(self):
1105
 
        return self._datetime_to_dbus(self.expires)
1106
 
    
1107
 
    # LastApprovalRequest - property
1108
 
    @dbus_service_property(_interface, signature="s", access="read")
1109
 
    def LastApprovalRequest_dbus_property(self):
1110
 
        return self._datetime_to_dbus(self.last_approval_request)
1111
 
    
1112
 
    # Timeout - property
1113
 
    @dbus_service_property(_interface, signature="t",
1114
 
                           access="readwrite")
1115
 
    def Timeout_dbus_property(self, value=None):
1116
 
        if value is None:       # get
1117
 
            return dbus.UInt64(self.timeout_milliseconds())
1118
 
        old_value = self.timeout
1119
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1120
 
        # Emit D-Bus signal
1121
 
        if old_value != self.timeout:
1122
 
            self.PropertyChanged(dbus.String("Timeout"),
1123
 
                                 dbus.UInt64(value, variant_level=1))
1124
 
        if getattr(self, "disable_initiator_tag", None) is None:
1125
 
            return
1126
 
        # Reschedule timeout
1127
 
        gobject.source_remove(self.disable_initiator_tag)
1128
 
        self.disable_initiator_tag = None
1129
 
        self.expires = None
1130
 
        time_to_die = (self.
1131
 
                       _timedelta_to_milliseconds((self
1132
 
                                                   .last_checked_ok
1133
 
                                                   + self.timeout)
1134
 
                                                  - datetime.datetime
1135
 
                                                  .utcnow()))
1136
 
        if time_to_die <= 0:
1137
 
            # The timeout has passed
1138
 
            self.disable()
1139
 
        else:
1140
 
            self.expires = (datetime.datetime.utcnow()
1141
 
                            + datetime.timedelta(milliseconds = time_to_die))
1142
 
            self.disable_initiator_tag = (gobject.timeout_add
1143
 
                                          (time_to_die, self.disable))
1144
 
 
1145
 
    # ExtendedTimeout - property
1146
 
    @dbus_service_property(_interface, signature="t",
1147
 
                           access="readwrite")
1148
 
    def ExtendedTimeout_dbus_property(self, value=None):
1149
 
        if value is None:       # get
1150
 
            return dbus.UInt64(self.extended_timeout_milliseconds())
1151
 
        old_value = self.extended_timeout
1152
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1153
 
        # Emit D-Bus signal
1154
 
        if old_value != self.extended_timeout:
1155
 
            self.PropertyChanged(dbus.String("ExtendedTimeout"),
1156
 
                                 dbus.UInt64(value, variant_level=1))
1157
 
 
1158
 
    # Interval - property
1159
 
    @dbus_service_property(_interface, signature="t",
1160
 
                           access="readwrite")
1161
 
    def Interval_dbus_property(self, value=None):
1162
 
        if value is None:       # get
1163
 
            return dbus.UInt64(self.interval_milliseconds())
1164
 
        old_value = self.interval
1165
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1166
 
        # Emit D-Bus signal
1167
 
        if old_value != self.interval:
1168
 
            self.PropertyChanged(dbus.String("Interval"),
1169
 
                                 dbus.UInt64(value, variant_level=1))
1170
 
        if getattr(self, "checker_initiator_tag", None) is None:
1171
 
            return
1172
 
        # Reschedule checker run
1173
 
        gobject.source_remove(self.checker_initiator_tag)
1174
 
        self.checker_initiator_tag = (gobject.timeout_add
1175
 
                                      (value, self.start_checker))
1176
 
        self.start_checker()    # Start one now, too
1177
 
 
1178
 
    # Checker - property
1179
 
    @dbus_service_property(_interface, signature="s",
1180
 
                           access="readwrite")
1181
 
    def Checker_dbus_property(self, value=None):
1182
 
        if value is None:       # get
1183
 
            return dbus.String(self.checker_command)
1184
 
        old_value = self.checker_command
1185
 
        self.checker_command = value
1186
 
        # Emit D-Bus signal
1187
 
        if old_value != self.checker_command:
1188
 
            self.PropertyChanged(dbus.String("Checker"),
1189
 
                                 dbus.String(self.checker_command,
1190
 
                                             variant_level=1))
1191
 
    
1192
 
    # CheckerRunning - property
1193
 
    @dbus_service_property(_interface, signature="b",
1194
 
                           access="readwrite")
1195
 
    def CheckerRunning_dbus_property(self, value=None):
1196
 
        if value is None:       # get
1197
 
            return dbus.Boolean(self.checker is not None)
1198
 
        if value:
1199
 
            self.start_checker()
1200
 
        else:
1201
 
            self.stop_checker()
1202
 
    
1203
 
    # ObjectPath - property
1204
 
    @dbus_service_property(_interface, signature="o", access="read")
1205
 
    def ObjectPath_dbus_property(self):
1206
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1207
 
    
1208
 
    # Secret = property
1209
 
    @dbus_service_property(_interface, signature="ay",
1210
 
                           access="write", byte_arrays=True)
1211
 
    def Secret_dbus_property(self, value):
1212
 
        self.secret = str(value)
1213
 
    
1214
 
    del _interface
1215
 
 
1216
 
 
1217
 
class ProxyClient(object):
1218
 
    def __init__(self, child_pipe, fpr, address):
1219
 
        self._pipe = child_pipe
1220
 
        self._pipe.send(('init', fpr, address))
1221
 
        if not self._pipe.recv():
1222
 
            raise KeyError()
1223
 
 
1224
 
    def __getattribute__(self, name):
1225
 
        if(name == '_pipe'):
1226
 
            return super(ProxyClient, self).__getattribute__(name)
1227
 
        self._pipe.send(('getattr', name))
1228
 
        data = self._pipe.recv()
1229
 
        if data[0] == 'data':
1230
 
            return data[1]
1231
 
        if data[0] == 'function':
1232
 
            def func(*args, **kwargs):
1233
 
                self._pipe.send(('funcall', name, args, kwargs))
1234
 
                return self._pipe.recv()[1]
1235
 
            return func
1236
 
 
1237
 
    def __setattr__(self, name, value):
1238
 
        if(name == '_pipe'):
1239
 
            return super(ProxyClient, self).__setattr__(name, value)
1240
 
        self._pipe.send(('setattr', name, value))
1241
 
 
1242
 
 
1243
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1244
 
    """A class to handle client connections.
1245
 
    
1246
 
    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.
1247
307
    Note: This will run in its own forked process."""
1248
308
    
1249
309
    def handle(self):
1250
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1251
 
            logger.info("TCP connection from: %s",
1252
 
                        unicode(self.client_address))
1253
 
            logger.debug("Pipe FD: %d",
1254
 
                         self.server.child_pipe.fileno())
1255
 
 
1256
 
            session = (gnutls.connection
1257
 
                       .ClientSession(self.request,
1258
 
                                      gnutls.connection
1259
 
                                      .X509Credentials()))
1260
 
 
1261
 
            # Note: gnutls.connection.X509Credentials is really a
1262
 
            # generic GnuTLS certificate credentials object so long as
1263
 
            # no X.509 keys are added to it.  Therefore, we can use it
1264
 
            # here despite using OpenPGP certificates.
1265
 
 
1266
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
1267
 
            #                      "+AES-256-CBC", "+SHA1",
1268
 
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
1269
 
            #                      "+DHE-DSS"))
1270
 
            # Use a fallback default, since this MUST be set.
1271
 
            priority = self.server.gnutls_priority
1272
 
            if priority is None:
1273
 
                priority = "NORMAL"
1274
 
            (gnutls.library.functions
1275
 
             .gnutls_priority_set_direct(session._c_object,
1276
 
                                         priority, None))
1277
 
 
1278
 
            # Start communication using the Mandos protocol
1279
 
            # Get protocol number
1280
 
            line = self.request.makefile().readline()
1281
 
            logger.debug("Protocol version: %r", line)
1282
 
            try:
1283
 
                if int(line.strip().split()[0]) > 1:
1284
 
                    raise RuntimeError
1285
 
            except (ValueError, IndexError, RuntimeError) as error:
1286
 
                logger.error("Unknown protocol version: %s", error)
1287
 
                return
1288
 
 
1289
 
            # Start GnuTLS connection
1290
 
            try:
1291
 
                session.handshake()
1292
 
            except gnutls.errors.GNUTLSError as error:
1293
 
                logger.warning("Handshake failed: %s", error)
1294
 
                # Do not run session.bye() here: the session is not
1295
 
                # established.  Just abandon the request.
1296
 
                return
1297
 
            logger.debug("Handshake succeeded")
1298
 
 
1299
 
            approval_required = False
1300
 
            try:
1301
 
                try:
1302
 
                    fpr = self.fingerprint(self.peer_certificate
1303
 
                                           (session))
1304
 
                except (TypeError,
1305
 
                        gnutls.errors.GNUTLSError) as error:
1306
 
                    logger.warning("Bad certificate: %s", error)
1307
 
                    return
1308
 
                logger.debug("Fingerprint: %s", fpr)
1309
 
 
1310
 
                try:
1311
 
                    client = ProxyClient(child_pipe, fpr,
1312
 
                                         self.client_address)
1313
 
                except KeyError:
1314
 
                    return
1315
 
                
1316
 
                if client.approval_delay:
1317
 
                    delay = client.approval_delay
1318
 
                    client.approvals_pending += 1
1319
 
                    approval_required = True
1320
 
                
1321
 
                while True:
1322
 
                    if not client.enabled:
1323
 
                        logger.info("Client %s is disabled",
1324
 
                                       client.name)
1325
 
                        if self.server.use_dbus:
1326
 
                            # Emit D-Bus signal
1327
 
                            client.Rejected("Disabled")                    
1328
 
                        return
1329
 
                    
1330
 
                    if client._approved or not client.approval_delay:
1331
 
                        #We are approved or approval is disabled
1332
 
                        break
1333
 
                    elif client._approved is None:
1334
 
                        logger.info("Client %s needs approval",
1335
 
                                    client.name)
1336
 
                        if self.server.use_dbus:
1337
 
                            # Emit D-Bus signal
1338
 
                            client.NeedApproval(
1339
 
                                client.approval_delay_milliseconds(),
1340
 
                                client.approved_by_default)
1341
 
                    else:
1342
 
                        logger.warning("Client %s was not approved",
1343
 
                                       client.name)
1344
 
                        if self.server.use_dbus:
1345
 
                            # Emit D-Bus signal
1346
 
                            client.Rejected("Denied")
1347
 
                        return
1348
 
                    
1349
 
                    #wait until timeout or approved
1350
 
                    #x = float(client._timedelta_to_milliseconds(delay))
1351
 
                    time = datetime.datetime.now()
1352
 
                    client.changedstate.acquire()
1353
 
                    client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1354
 
                    client.changedstate.release()
1355
 
                    time2 = datetime.datetime.now()
1356
 
                    if (time2 - time) >= delay:
1357
 
                        if not client.approved_by_default:
1358
 
                            logger.warning("Client %s timed out while"
1359
 
                                           " waiting for approval",
1360
 
                                           client.name)
1361
 
                            if self.server.use_dbus:
1362
 
                                # Emit D-Bus signal
1363
 
                                client.Rejected("Approval timed out")
1364
 
                            return
1365
 
                        else:
1366
 
                            break
1367
 
                    else:
1368
 
                        delay -= time2 - time
1369
 
                
1370
 
                sent_size = 0
1371
 
                while sent_size < len(client.secret):
1372
 
                    try:
1373
 
                        sent = session.send(client.secret[sent_size:])
1374
 
                    except gnutls.errors.GNUTLSError as error:
1375
 
                        logger.warning("gnutls send failed")
1376
 
                        return
1377
 
                    logger.debug("Sent: %d, remaining: %d",
1378
 
                                 sent, len(client.secret)
1379
 
                                 - (sent_size + sent))
1380
 
                    sent_size += sent
1381
 
 
1382
 
                logger.info("Sending secret to %s", client.name)
1383
 
                # bump the timeout as if seen
1384
 
                client.checked_ok(client.extended_timeout)
1385
 
                if self.server.use_dbus:
1386
 
                    # Emit D-Bus signal
1387
 
                    client.GotSecret()
1388
 
            
1389
 
            finally:
1390
 
                if approval_required:
1391
 
                    client.approvals_pending -= 1
1392
 
                try:
1393
 
                    session.bye()
1394
 
                except gnutls.errors.GNUTLSError as error:
1395
 
                    logger.warning("GnuTLS bye failed")
1396
 
    
1397
 
    @staticmethod
1398
 
    def peer_certificate(session):
1399
 
        "Return the peer's OpenPGP certificate as a bytestring"
1400
 
        # If not an OpenPGP certificate...
1401
 
        if (gnutls.library.functions
1402
 
            .gnutls_certificate_type_get(session._c_object)
1403
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1404
 
            # ...do the normal thing
1405
 
            return session.peer_certificate
1406
 
        list_size = ctypes.c_uint(1)
1407
 
        cert_list = (gnutls.library.functions
1408
 
                     .gnutls_certificate_get_peers
1409
 
                     (session._c_object, ctypes.byref(list_size)))
1410
 
        if not bool(cert_list) and list_size.value != 0:
1411
 
            raise gnutls.errors.GNUTLSError("error getting peer"
1412
 
                                            " certificate")
1413
 
        if list_size.value == 0:
1414
 
            return None
1415
 
        cert = cert_list[0]
1416
 
        return ctypes.string_at(cert.data, cert.size)
1417
 
    
1418
 
    @staticmethod
1419
 
    def fingerprint(openpgp):
1420
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1421
 
        # New GnuTLS "datum" with the OpenPGP public key
1422
 
        datum = (gnutls.library.types
1423
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1424
 
                                             ctypes.POINTER
1425
 
                                             (ctypes.c_ubyte)),
1426
 
                                 ctypes.c_uint(len(openpgp))))
1427
 
        # New empty GnuTLS certificate
1428
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1429
 
        (gnutls.library.functions
1430
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1431
 
        # Import the OpenPGP public key into the certificate
1432
 
        (gnutls.library.functions
1433
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1434
 
                                    gnutls.library.constants
1435
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1436
 
        # Verify the self signature in the key
1437
 
        crtverify = ctypes.c_uint()
1438
 
        (gnutls.library.functions
1439
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1440
 
                                         ctypes.byref(crtverify)))
1441
 
        if crtverify.value != 0:
1442
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1443
 
            raise (gnutls.errors.CertificateSecurityError
1444
 
                   ("Verify failed"))
1445
 
        # New buffer for the fingerprint
1446
 
        buf = ctypes.create_string_buffer(20)
1447
 
        buf_len = ctypes.c_size_t()
1448
 
        # Get the fingerprint from the certificate into the buffer
1449
 
        (gnutls.library.functions
1450
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1451
 
                                             ctypes.byref(buf_len)))
1452
 
        # Deinit the certificate
1453
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1454
 
        # Convert the buffer to a Python bytestring
1455
 
        fpr = ctypes.string_at(buf, buf_len.value)
1456
 
        # Convert the bytestring to hexadecimal notation
1457
 
        hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
1458
 
        return hex_fpr
1459
 
 
1460
 
 
1461
 
class MultiprocessingMixIn(object):
1462
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1463
 
    def sub_process_main(self, request, address):
1464
 
        try:
1465
 
            self.finish_request(request, address)
1466
 
        except:
1467
 
            self.handle_error(request, address)
1468
 
        self.close_request(request)
1469
 
            
1470
 
    def process_request(self, request, address):
1471
 
        """Start a new process to process the request."""
1472
 
        multiprocessing.Process(target = self.sub_process_main,
1473
 
                                args = (request, address)).start()
1474
 
 
1475
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1476
 
    """ adds a pipe to the MixIn """
1477
 
    def process_request(self, request, client_address):
1478
 
        """Overrides and wraps the original process_request().
1479
 
        
1480
 
        This function creates a new pipe in self.pipe
1481
 
        """
1482
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1483
 
 
1484
 
        super(MultiprocessingMixInWithPipe,
1485
 
              self).process_request(request, client_address)
1486
 
        self.child_pipe.close()
1487
 
        self.add_pipe(parent_pipe)
1488
 
 
1489
 
    def add_pipe(self, parent_pipe):
1490
 
        """Dummy function; override as necessary"""
1491
 
        raise NotImplementedError
1492
 
 
1493
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1494
 
                     socketserver.TCPServer, object):
1495
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1496
 
    
 
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.
1497
367
    Attributes:
1498
 
        enabled:        Boolean; whether this server is activated yet
1499
 
        interface:      None or a network interface name (string)
1500
 
        use_ipv6:       Boolean; to use IPv6 or not
 
368
        options:        Command line options
 
369
        clients:        Set() of Client objects
1501
370
    """
1502
 
    def __init__(self, server_address, RequestHandlerClass,
1503
 
                 interface=None, use_ipv6=True):
1504
 
        self.interface = interface
1505
 
        if use_ipv6:
1506
 
            self.address_family = socket.AF_INET6
1507
 
        socketserver.TCPServer.__init__(self, server_address,
1508
 
                                        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)
1509
380
    def server_bind(self):
1510
381
        """This overrides the normal server_bind() function
1511
382
        to bind to an interface if one was specified, and also NOT to
1512
383
        bind to an address or port if they were not specified."""
1513
 
        if self.interface is not None:
1514
 
            if SO_BINDTODEVICE is None:
1515
 
                logger.error("SO_BINDTODEVICE does not exist;"
1516
 
                             " cannot bind to interface %s",
1517
 
                             self.interface)
1518
 
            else:
1519
 
                try:
1520
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1521
 
                                           SO_BINDTODEVICE,
1522
 
                                           str(self.interface
1523
 
                                               + '\0'))
1524
 
                except socket.error as error:
1525
 
                    if error[0] == errno.EPERM:
1526
 
                        logger.error("No permission to"
1527
 
                                     " bind to interface %s",
1528
 
                                     self.interface)
1529
 
                    elif error[0] == errno.ENOPROTOOPT:
1530
 
                        logger.error("SO_BINDTODEVICE not available;"
1531
 
                                     " cannot bind to interface %s",
1532
 
                                     self.interface)
1533
 
                    else:
1534
 
                        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
1535
399
        # Only bind(2) the socket if we really need to.
1536
400
        if self.server_address[0] or self.server_address[1]:
1537
401
            if not self.server_address[0]:
1538
 
                if self.address_family == socket.AF_INET6:
1539
 
                    any_address = "::" # in6addr_any
1540
 
                else:
1541
 
                    any_address = socket.INADDR_ANY
1542
 
                self.server_address = (any_address,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
1543
404
                                       self.server_address[1])
1544
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
1545
406
                self.server_address = (self.server_address[0],
1546
407
                                       0)
1547
 
#                 if self.interface:
1548
 
#                     self.server_address = (self.server_address[0],
1549
 
#                                            0, # port
1550
 
#                                            0, # flowinfo
1551
 
#                                            if_nametoindex
1552
 
#                                            (self.interface))
1553
 
            return socketserver.TCPServer.server_bind(self)
1554
 
 
1555
 
 
1556
 
class MandosServer(IPv6_TCPServer):
1557
 
    """Mandos server.
1558
 
    
1559
 
    Attributes:
1560
 
        clients:        set of Client objects
1561
 
        gnutls_priority GnuTLS priority string
1562
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1563
 
    
1564
 
    Assumes a gobject.MainLoop event loop.
1565
 
    """
1566
 
    def __init__(self, server_address, RequestHandlerClass,
1567
 
                 interface=None, use_ipv6=True, clients=None,
1568
 
                 gnutls_priority=None, use_dbus=True):
1569
 
        self.enabled = False
1570
 
        self.clients = clients
1571
 
        if self.clients is None:
1572
 
            self.clients = set()
1573
 
        self.use_dbus = use_dbus
1574
 
        self.gnutls_priority = gnutls_priority
1575
 
        IPv6_TCPServer.__init__(self, server_address,
1576
 
                                RequestHandlerClass,
1577
 
                                interface = interface,
1578
 
                                use_ipv6 = use_ipv6)
1579
 
    def server_activate(self):
1580
 
        if self.enabled:
1581
 
            return socketserver.TCPServer.server_activate(self)
1582
 
    def enable(self):
1583
 
        self.enabled = True
1584
 
    def add_pipe(self, parent_pipe):
1585
 
        # Call "handle_ipc" for both data and EOF events
1586
 
        gobject.io_add_watch(parent_pipe.fileno(),
1587
 
                             gobject.IO_IN | gobject.IO_HUP,
1588
 
                             functools.partial(self.handle_ipc,
1589
 
                                               parent_pipe = parent_pipe))
1590
 
        
1591
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1592
 
                   client_object=None):
1593
 
        condition_names = {
1594
 
            gobject.IO_IN: "IN",   # There is data to read.
1595
 
            gobject.IO_OUT: "OUT", # Data can be written (without
1596
 
                                    # blocking).
1597
 
            gobject.IO_PRI: "PRI", # There is urgent data to read.
1598
 
            gobject.IO_ERR: "ERR", # Error condition.
1599
 
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
1600
 
                                    # broken, usually for pipes and
1601
 
                                    # sockets).
1602
 
            }
1603
 
        conditions_string = ' | '.join(name
1604
 
                                       for cond, name in
1605
 
                                       condition_names.iteritems()
1606
 
                                       if cond & condition)
1607
 
        # error or the other end of multiprocessing.Pipe has closed
1608
 
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1609
 
            return False
1610
 
        
1611
 
        # Read a request from the child
1612
 
        request = parent_pipe.recv()
1613
 
        command = request[0]
1614
 
        
1615
 
        if command == 'init':
1616
 
            fpr = request[1]
1617
 
            address = request[2]
1618
 
            
1619
 
            for c in self.clients:
1620
 
                if c.fingerprint == fpr:
1621
 
                    client = c
1622
 
                    break
1623
 
            else:
1624
 
                logger.info("Client not found for fingerprint: %s, ad"
1625
 
                            "dress: %s", fpr, address)
1626
 
                if self.use_dbus:
1627
 
                    # Emit D-Bus signal
1628
 
                    mandos_dbus_service.ClientNotFound(fpr, address[0])
1629
 
                parent_pipe.send(False)
1630
 
                return False
1631
 
            
1632
 
            gobject.io_add_watch(parent_pipe.fileno(),
1633
 
                                 gobject.IO_IN | gobject.IO_HUP,
1634
 
                                 functools.partial(self.handle_ipc,
1635
 
                                                   parent_pipe = parent_pipe,
1636
 
                                                   client_object = client))
1637
 
            parent_pipe.send(True)
1638
 
            # remove the old hook in favor of the new above hook on same fileno
1639
 
            return False
1640
 
        if command == 'funcall':
1641
 
            funcname = request[1]
1642
 
            args = request[2]
1643
 
            kwargs = request[3]
1644
 
            
1645
 
            parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1646
 
 
1647
 
        if command == 'getattr':
1648
 
            attrname = request[1]
1649
 
            if callable(client_object.__getattribute__(attrname)):
1650
 
                parent_pipe.send(('function',))
1651
 
            else:
1652
 
                parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1653
 
        
1654
 
        if command == 'setattr':
1655
 
            attrname = request[1]
1656
 
            value = request[2]
1657
 
            setattr(client_object, attrname, value)
1658
 
 
1659
 
        return True
 
408
            return super(type(self), self).server_bind()
1660
409
 
1661
410
 
1662
411
def string_to_delta(interval):
1663
412
    """Parse a string and return a datetime.timedelta
1664
 
    
 
413
 
1665
414
    >>> string_to_delta('7d')
1666
415
    datetime.timedelta(7)
1667
416
    >>> string_to_delta('60s')
1670
419
    datetime.timedelta(0, 3600)
1671
420
    >>> string_to_delta('24h')
1672
421
    datetime.timedelta(1)
1673
 
    >>> string_to_delta('1w')
 
422
    >>> string_to_delta(u'1w')
1674
423
    datetime.timedelta(7)
1675
 
    >>> string_to_delta('5m 30s')
1676
 
    datetime.timedelta(0, 330)
1677
424
    """
1678
 
    timevalue = datetime.timedelta(0)
1679
 
    for s in interval.split():
1680
 
        try:
1681
 
            suffix = unicode(s[-1])
1682
 
            value = int(s[:-1])
1683
 
            if suffix == "d":
1684
 
                delta = datetime.timedelta(value)
1685
 
            elif suffix == "s":
1686
 
                delta = datetime.timedelta(0, value)
1687
 
            elif suffix == "m":
1688
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1689
 
            elif suffix == "h":
1690
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1691
 
            elif suffix == "w":
1692
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1693
 
            else:
1694
 
                raise ValueError("Unknown suffix %r" % suffix)
1695
 
        except (ValueError, IndexError) as e:
1696
 
            raise ValueError(*(e.args))
1697
 
        timevalue += delta
1698
 
    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
1699
515
 
1700
516
 
1701
517
def if_nametoindex(interface):
1702
 
    """Call the C function if_nametoindex(), or equivalent
1703
 
    
1704
 
    Note: This function cannot accept a unicode string."""
1705
 
    global if_nametoindex
 
518
    """Call the C function if_nametoindex()"""
1706
519
    try:
1707
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1708
 
                          (ctypes.util.find_library("c"))
1709
 
                          .if_nametoindex)
 
520
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
521
        return libc.if_nametoindex(interface)
1710
522
    except (OSError, AttributeError):
1711
 
        logger.warning("Doing if_nametoindex the hard way")
1712
 
        def if_nametoindex(interface):
1713
 
            "Get an interface index the hard way, i.e. using fcntl()"
1714
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
1715
 
            with contextlib.closing(socket.socket()) as s:
1716
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1717
 
                                    struct.pack(str("16s16x"),
1718
 
                                                interface))
1719
 
            interface_index = struct.unpack(str("I"),
1720
 
                                            ifreq[16:20])[0]
1721
 
            return interface_index
1722
 
    return if_nametoindex(interface)
1723
 
 
1724
 
 
1725
 
def daemon(nochdir = False, noclose = False):
1726
 
    """See daemon(3).  Standard BSD Unix function.
1727
 
    
1728
 
    This should really exist as os.daemon, but it doesn't (yet)."""
1729
 
    if os.fork():
1730
 
        sys.exit()
1731
 
    os.setsid()
1732
 
    if not nochdir:
1733
 
        os.chdir("/")
1734
 
    if os.fork():
1735
 
        sys.exit()
1736
 
    if not noclose:
1737
 
        # Close all standard open file descriptors
1738
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1739
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1740
 
            raise OSError(errno.ENODEV,
1741
 
                          "%s not a character device"
1742
 
                          % os.path.devnull)
1743
 
        os.dup2(null, sys.stdin.fileno())
1744
 
        os.dup2(null, sys.stdout.fileno())
1745
 
        os.dup2(null, sys.stderr.fileno())
1746
 
        if null > 2:
1747
 
            os.close(null)
1748
 
 
1749
 
 
1750
 
def main():
1751
 
    
1752
 
    ##################################################################
1753
 
    # Parsing of options, both command line and config file
1754
 
    
1755
 
    parser = argparse.ArgumentParser()
1756
 
    parser.add_argument("-v", "--version", action="version",
1757
 
                        version = "%%(prog)s %s" % version,
1758
 
                        help="show version number and exit")
1759
 
    parser.add_argument("-i", "--interface", metavar="IF",
1760
 
                        help="Bind to interface IF")
1761
 
    parser.add_argument("-a", "--address",
1762
 
                        help="Address to listen for requests on")
1763
 
    parser.add_argument("-p", "--port", type=int,
1764
 
                        help="Port number to receive requests on")
1765
 
    parser.add_argument("--check", action="store_true",
1766
 
                        help="Run self-test")
1767
 
    parser.add_argument("--debug", action="store_true",
1768
 
                        help="Debug mode; run in foreground and log"
1769
 
                        " to terminal")
1770
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
1771
 
                        help="Debug level for stdout output")
1772
 
    parser.add_argument("--priority", help="GnuTLS"
1773
 
                        " priority string (see GnuTLS documentation)")
1774
 
    parser.add_argument("--servicename",
1775
 
                        metavar="NAME", help="Zeroconf service name")
1776
 
    parser.add_argument("--configdir",
1777
 
                        default="/etc/mandos", metavar="DIR",
1778
 
                        help="Directory to search for configuration"
1779
 
                        " files")
1780
 
    parser.add_argument("--no-dbus", action="store_false",
1781
 
                        dest="use_dbus", help="Do not provide D-Bus"
1782
 
                        " system bus interface")
1783
 
    parser.add_argument("--no-ipv6", action="store_false",
1784
 
                        dest="use_ipv6", help="Do not use IPv6")
1785
 
    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()
1786
566
    
1787
567
    if options.check:
1788
568
        import doctest
1789
569
        doctest.testmod()
1790
570
        sys.exit()
1791
571
    
1792
 
    # Default values for config file for server-global settings
1793
 
    server_defaults = { "interface": "",
1794
 
                        "address": "",
1795
 
                        "port": "",
1796
 
                        "debug": "False",
1797
 
                        "priority":
1798
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1799
 
                        "servicename": "Mandos",
1800
 
                        "use_dbus": "True",
1801
 
                        "use_ipv6": "True",
1802
 
                        "debuglevel": "",
1803
 
                        }
1804
 
    
1805
 
    # Parse config file for server-global settings
1806
 
    server_config = configparser.SafeConfigParser(server_defaults)
1807
 
    del server_defaults
1808
 
    server_config.read(os.path.join(options.configdir,
1809
 
                                    "mandos.conf"))
1810
 
    # Convert the SafeConfigParser object to a dict
1811
 
    server_settings = server_config.defaults()
1812
 
    # Use the appropriate methods on the non-string config options
1813
 
    for option in ("debug", "use_dbus", "use_ipv6"):
1814
 
        server_settings[option] = server_config.getboolean("DEFAULT",
1815
 
                                                           option)
1816
 
    if server_settings["port"]:
1817
 
        server_settings["port"] = server_config.getint("DEFAULT",
1818
 
                                                       "port")
1819
 
    del server_config
1820
 
    
1821
 
    # Override the settings from the config file with command line
1822
 
    # options, if set.
1823
 
    for option in ("interface", "address", "port", "debug",
1824
 
                   "priority", "servicename", "configdir",
1825
 
                   "use_dbus", "use_ipv6", "debuglevel"):
1826
 
        value = getattr(options, option)
1827
 
        if value is not None:
1828
 
            server_settings[option] = value
1829
 
    del options
1830
 
    # Force all strings to be unicode
1831
 
    for option in server_settings.keys():
1832
 
        if type(server_settings[option]) is str:
1833
 
            server_settings[option] = unicode(server_settings[option])
1834
 
    # Now we have our good server settings in "server_settings"
1835
 
    
1836
 
    ##################################################################
1837
 
    
1838
 
    # For convenience
1839
 
    debug = server_settings["debug"]
1840
 
    debuglevel = server_settings["debuglevel"]
1841
 
    use_dbus = server_settings["use_dbus"]
1842
 
    use_ipv6 = server_settings["use_ipv6"]
1843
 
 
1844
 
    if server_settings["servicename"] != "Mandos":
1845
 
        syslogger.setFormatter(logging.Formatter
1846
 
                               ('Mandos (%s) [%%(process)d]:'
1847
 
                                ' %%(levelname)s: %%(message)s'
1848
 
                                % server_settings["servicename"]))
1849
 
    
1850
 
    # Parse config file with clients
1851
 
    client_defaults = { "timeout": "5m",
1852
 
                        "extended_timeout": "15m",
1853
 
                        "interval": "2m",
1854
 
                        "checker": "fping -q -- %%(host)s",
1855
 
                        "host": "",
1856
 
                        "approval_delay": "0s",
1857
 
                        "approval_duration": "1s",
1858
 
                        }
1859
 
    client_config = configparser.SafeConfigParser(client_defaults)
1860
 
    client_config.read(os.path.join(server_settings["configdir"],
1861
 
                                    "clients.conf"))
1862
 
    
1863
 
    global mandos_dbus_service
1864
 
    mandos_dbus_service = None
1865
 
    
1866
 
    tcp_server = MandosServer((server_settings["address"],
1867
 
                               server_settings["port"]),
1868
 
                              ClientHandler,
1869
 
                              interface=(server_settings["interface"]
1870
 
                                         or None),
1871
 
                              use_ipv6=use_ipv6,
1872
 
                              gnutls_priority=
1873
 
                              server_settings["priority"],
1874
 
                              use_dbus=use_dbus)
1875
 
    if not debug:
1876
 
        pidfilename = "/var/run/mandos.pid"
1877
 
        try:
1878
 
            pidfile = open(pidfilename, "w")
1879
 
        except IOError:
1880
 
            logger.error("Could not open file %r", pidfilename)
1881
 
    
1882
 
    try:
1883
 
        uid = pwd.getpwnam("_mandos").pw_uid
1884
 
        gid = pwd.getpwnam("_mandos").pw_gid
1885
 
    except KeyError:
1886
 
        try:
1887
 
            uid = pwd.getpwnam("mandos").pw_uid
1888
 
            gid = pwd.getpwnam("mandos").pw_gid
1889
 
        except KeyError:
1890
 
            try:
1891
 
                uid = pwd.getpwnam("nobody").pw_uid
1892
 
                gid = pwd.getpwnam("nobody").pw_gid
1893
 
            except KeyError:
1894
 
                uid = 65534
1895
 
                gid = 65534
1896
 
    try:
1897
 
        os.setgid(gid)
1898
 
        os.setuid(uid)
1899
 
    except OSError as error:
1900
 
        if error[0] != errno.EPERM:
1901
 
            raise error
1902
 
    
1903
 
    if not debug and not debuglevel:
1904
 
        syslogger.setLevel(logging.WARNING)
1905
 
        console.setLevel(logging.WARNING)
1906
 
    if debuglevel:
1907
 
        level = getattr(logging, debuglevel.upper())
1908
 
        syslogger.setLevel(level)
1909
 
        console.setLevel(level)
1910
 
 
1911
 
    if debug:
1912
 
        # Enable all possible GnuTLS debugging
1913
 
        
1914
 
        # "Use a log level over 10 to enable all debugging options."
1915
 
        # - GnuTLS manual
1916
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1917
 
        
1918
 
        @gnutls.library.types.gnutls_log_func
1919
 
        def debug_gnutls(level, string):
1920
 
            logger.debug("GnuTLS: %s", string[:-1])
1921
 
        
1922
 
        (gnutls.library.functions
1923
 
         .gnutls_global_set_log_function(debug_gnutls))
1924
 
        
1925
 
        # Redirect stdin so all checkers get /dev/null
1926
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1927
 
        os.dup2(null, sys.stdin.fileno())
1928
 
        if null > 2:
1929
 
            os.close(null)
1930
 
    else:
1931
 
        # No console logging
1932
 
        logger.removeHandler(console)
1933
 
    
1934
 
    # Need to fork before connecting to D-Bus
1935
 
    if not debug:
1936
 
        # Close all input and output, do double fork, etc.
1937
 
        daemon()
1938
 
    
1939
 
    global main_loop
1940
 
    # 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
1941
589
    DBusGMainLoop(set_as_default=True )
1942
590
    main_loop = gobject.MainLoop()
1943
591
    bus = dbus.SystemBus()
1944
 
    # End of Avahi example code
1945
 
    if use_dbus:
1946
 
        try:
1947
 
            bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",
1948
 
                                            bus, do_not_queue=True)
1949
 
        except dbus.exceptions.NameExistsException as e:
1950
 
            logger.error(unicode(e) + ", disabling D-Bus")
1951
 
            use_dbus = False
1952
 
            server_settings["use_dbus"] = False
1953
 
            tcp_server.use_dbus = False
1954
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1955
 
    service = AvahiService(name = server_settings["servicename"],
1956
 
                           servicetype = "_mandos._tcp",
1957
 
                           protocol = protocol, bus = bus)
1958
 
    if server_settings["interface"]:
1959
 
        service.interface = (if_nametoindex
1960
 
                             (str(server_settings["interface"])))
1961
 
    
1962
 
    global multiprocessing_manager
1963
 
    multiprocessing_manager = multiprocessing.Manager()
1964
 
    
1965
 
    client_class = Client
1966
 
    if use_dbus:
1967
 
        client_class = functools.partial(ClientDBus, bus = bus)
1968
 
    def client_config_items(config, section):
1969
 
        special_settings = {
1970
 
            "approved_by_default":
1971
 
                lambda: config.getboolean(section,
1972
 
                                          "approved_by_default"),
1973
 
            }
1974
 
        for name, value in config.items(section):
1975
 
            try:
1976
 
                yield (name, special_settings[name]())
1977
 
            except KeyError:
1978
 
                yield (name, value)
1979
 
    
1980
 
    tcp_server.clients.update(set(
1981
 
            client_class(name = section,
1982
 
                         config= dict(client_config_items(
1983
 
                        client_config, section)))
1984
 
            for section in client_config.sections()))
1985
 
    if not tcp_server.clients:
1986
 
        logger.warning("No clients defined")
1987
 
        
1988
 
    if not debug:
1989
 
        try:
1990
 
            with pidfile:
1991
 
                pid = os.getpid()
1992
 
                pidfile.write(str(pid) + "\n".encode("utf-8"))
1993
 
            del pidfile
1994
 
        except IOError:
1995
 
            logger.error("Could not write to file %r with PID %d",
1996
 
                         pidfilename, pid)
1997
 
        except NameError:
1998
 
            # "pidfile" was never created
1999
 
            pass
2000
 
        del pidfilename
2001
 
        
2002
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
2003
 
 
2004
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
2005
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
2006
 
    
2007
 
    if use_dbus:
2008
 
        class MandosDBusService(dbus.service.Object):
2009
 
            """A D-Bus proxy object"""
2010
 
            def __init__(self):
2011
 
                dbus.service.Object.__init__(self, bus, "/")
2012
 
            _interface = "se.bsnet.fukt.Mandos"
2013
 
            
2014
 
            @dbus.service.signal(_interface, signature="o")
2015
 
            def ClientAdded(self, objpath):
2016
 
                "D-Bus signal"
2017
 
                pass
2018
 
            
2019
 
            @dbus.service.signal(_interface, signature="ss")
2020
 
            def ClientNotFound(self, fingerprint, address):
2021
 
                "D-Bus signal"
2022
 
                pass
2023
 
            
2024
 
            @dbus.service.signal(_interface, signature="os")
2025
 
            def ClientRemoved(self, objpath, name):
2026
 
                "D-Bus signal"
2027
 
                pass
2028
 
            
2029
 
            @dbus.service.method(_interface, out_signature="ao")
2030
 
            def GetAllClients(self):
2031
 
                "D-Bus method"
2032
 
                return dbus.Array(c.dbus_object_path
2033
 
                                  for c in tcp_server.clients)
2034
 
            
2035
 
            @dbus.service.method(_interface,
2036
 
                                 out_signature="a{oa{sv}}")
2037
 
            def GetAllClientsWithProperties(self):
2038
 
                "D-Bus method"
2039
 
                return dbus.Dictionary(
2040
 
                    ((c.dbus_object_path, c.GetAll(""))
2041
 
                     for c in tcp_server.clients),
2042
 
                    signature="oa{sv}")
2043
 
            
2044
 
            @dbus.service.method(_interface, in_signature="o")
2045
 
            def RemoveClient(self, object_path):
2046
 
                "D-Bus method"
2047
 
                for c in tcp_server.clients:
2048
 
                    if c.dbus_object_path == object_path:
2049
 
                        tcp_server.clients.remove(c)
2050
 
                        c.remove_from_connection()
2051
 
                        # Don't signal anything except ClientRemoved
2052
 
                        c.disable(quiet=True)
2053
 
                        # Emit D-Bus signal
2054
 
                        self.ClientRemoved(object_path, c.name)
2055
 
                        return
2056
 
                raise KeyError(object_path)
2057
 
            
2058
 
            del _interface
2059
 
        
2060
 
        mandos_dbus_service = MandosDBusService()
2061
 
    
2062
 
    def cleanup():
2063
 
        "Cleanup function; run on exit"
2064
 
        service.cleanup()
2065
 
        
2066
 
        while tcp_server.clients:
2067
 
            client = tcp_server.clients.pop()
2068
 
            if use_dbus:
2069
 
                client.remove_from_connection()
2070
 
            client.disable_hook = None
2071
 
            # Don't signal anything except ClientRemoved
2072
 
            client.disable(quiet=True)
2073
 
            if use_dbus:
2074
 
                # Emit D-Bus signal
2075
 
                mandos_dbus_service.ClientRemoved(client.dbus_object_path,
2076
 
                                                  client.name)
2077
 
    
2078
 
    atexit.register(cleanup)
2079
 
    
2080
 
    for client in tcp_server.clients:
2081
 
        if use_dbus:
2082
 
            # Emit D-Bus signal
2083
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
2084
 
        client.enable()
2085
 
    
2086
 
    tcp_server.enable()
2087
 
    tcp_server.server_activate()
2088
 
    
2089
 
    # Find out what port we got
2090
 
    service.port = tcp_server.socket.getsockname()[1]
2091
 
    if use_ipv6:
2092
 
        logger.info("Now listening on address %r, port %d,"
2093
 
                    " flowinfo %d, scope_id %d"
2094
 
                    % tcp_server.socket.getsockname())
2095
 
    else:                       # IPv4
2096
 
        logger.info("Now listening on address %r, port %d"
2097
 
                    % tcp_server.socket.getsockname())
2098
 
    
2099
 
    #service.interface = tcp_server.socket.getsockname()[3]
2100
 
    
 
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)
2101
634
    try:
2102
 
        # From the Avahi example code
2103
 
        try:
2104
 
            service.activate()
2105
 
        except dbus.exceptions.DBusException as error:
2106
 
            logger.critical("DBusException: %s", error)
2107
 
            cleanup()
2108
 
            sys.exit(1)
2109
 
        # End of Avahi example code
2110
 
        
2111
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2112
 
                             lambda *args, **kwargs:
2113
 
                             (tcp_server.handle_request
2114
 
                              (*args[2:], **kwargs) or True))
2115
 
        
2116
 
        logger.debug("Starting main loop")
2117
635
        main_loop.run()
2118
 
    except AvahiError as error:
2119
 
        logger.critical("AvahiError: %s", error)
2120
 
        cleanup()
2121
 
        sys.exit(1)
2122
636
    except KeyboardInterrupt:
2123
 
        if debug:
2124
 
            print("", file=sys.stderr)
2125
 
        logger.debug("Server received KeyboardInterrupt")
2126
 
    logger.debug("Server exiting")
2127
 
    # Must run before the D-Bus bus name gets deregistered
2128
 
    cleanup()
 
637
        print
 
638
    
 
639
    # Cleanup here
2129
640
 
2130
 
if __name__ == '__main__':
2131
 
    main()
 
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()