/mandos/release

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  • Committer: Teddy Hogeborn
  • Date: 2008-08-04 16:05:01 UTC
  • mfrom: (24.1.15 mandos)
  • Revision ID: teddy@fukt.bsnet.se-20080804160501-woej7nf8amgrbc2e
* plugins.d/mandosclient.c (start_mandos_communication): Change "to"
                                    to be a union.  All users changed.

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Lines of Context:
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# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add", "remove", "server_state_changed",
10
 
# "entry_group_state_changed", "cleanup", and "activate" in the
11
 
# "AvahiService" class, and some lines in "main".
 
9
# following functions: "AvahiService.add", "AvahiService.remove",
 
10
# "server_state_changed", "entry_group_state_changed", and some lines
 
11
# in "main".
12
12
13
13
# Everything else is
14
 
# Copyright © 2008-2011 Teddy Hogeborn
15
 
# Copyright © 2008-2011 Björn Påhlsson
 
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
16
15
17
16
# This program is free software: you can redistribute it and/or modify
18
17
# it under the terms of the GNU General Public License as published by
25
24
#     GNU General Public License for more details.
26
25
27
26
# 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/>.
 
27
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
30
28
31
29
# Contact the authors at <mandos@fukt.bsnet.se>.
32
30
33
31
 
34
 
from __future__ import (division, absolute_import, print_function,
35
 
                        unicode_literals)
 
32
from __future__ import division
36
33
 
37
 
import SocketServer as socketserver
 
34
import SocketServer
38
35
import socket
39
 
import argparse
 
36
import select
 
37
from optparse import OptionParser
40
38
import datetime
41
39
import errno
42
40
import gnutls.crypto
45
43
import gnutls.library.functions
46
44
import gnutls.library.constants
47
45
import gnutls.library.types
48
 
import ConfigParser as configparser
 
46
import ConfigParser
49
47
import sys
50
48
import re
51
49
import os
52
50
import signal
 
51
from sets import Set
53
52
import subprocess
54
53
import atexit
55
54
import stat
56
55
import logging
57
56
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
57
 
66
58
import dbus
67
 
import dbus.service
68
59
import gobject
69
60
import avahi
70
61
from dbus.mainloop.glib import DBusGMainLoop
71
62
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 = "1.3.0"
86
 
 
87
 
#logger = logging.getLogger('mandos')
 
63
 
 
64
# Brief description of the operation of this program:
 
65
 
66
# This server announces itself as a Zeroconf service.  Connecting
 
67
# clients use the TLS protocol, with the unusual quirk that this
 
68
# server program acts as a TLS "client" while a connecting client acts
 
69
# as a TLS "server".  The client (acting as a TLS "server") must
 
70
# supply an OpenPGP certificate, and the fingerprint of this
 
71
# certificate is used by this server to look up (in a list read from a
 
72
# file at start time) which binary blob to give the client.  No other
 
73
# authentication or authorization is done by this server.
 
74
 
 
75
 
88
76
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'))
 
77
syslogger = logging.handlers.SysLogHandler\
 
78
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
 
79
syslogger.setFormatter(logging.Formatter\
 
80
                        ('%(levelname)s: %(message)s'))
95
81
logger.addHandler(syslogger)
 
82
del syslogger
96
83
 
97
 
console = logging.StreamHandler()
98
 
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
99
 
                                       ' %(levelname)s:'
100
 
                                       ' %(message)s'))
101
 
logger.addHandler(console)
102
84
 
103
85
class AvahiError(Exception):
104
 
    def __init__(self, value, *args, **kwargs):
 
86
    def __init__(self, value):
105
87
        self.value = value
106
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
107
 
    def __unicode__(self):
108
 
        return unicode(repr(self.value))
 
88
    def __str__(self):
 
89
        return repr(self.value)
109
90
 
110
91
class AvahiServiceError(AvahiError):
111
92
    pass
115
96
 
116
97
 
117
98
class AvahiService(object):
118
 
    """An Avahi (Zeroconf) service.
119
 
    
120
 
    Attributes:
 
99
    """
121
100
    interface: integer; avahi.IF_UNSPEC or an interface index.
122
101
               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()
 
102
    name = string; Example: "Mandos"
 
103
    type = string; Example: "_mandos._tcp".
 
104
                   See <http://www.dns-sd.org/ServiceTypes.html>
 
105
    port = integer; what port to announce
 
106
    TXT = list of strings; TXT record for the service
 
107
    domain = string; Domain to publish on, default to .local if empty.
 
108
    host = string; Host to publish records for, default to localhost
 
109
                   if empty.
 
110
    max_renames = integer; maximum number of renames
 
111
    rename_count = integer; counter so we only rename after collisions
 
112
                   a sensible number of times
136
113
    """
137
114
    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):
 
115
                 type = None, port = None, TXT = None, domain = "",
 
116
                 host = "", max_renames = 12):
 
117
        """An Avahi (Zeroconf) service. """
141
118
        self.interface = interface
142
119
        self.name = name
143
 
        self.type = servicetype
 
120
        self.type = type
144
121
        self.port = port
145
 
        self.TXT = TXT if TXT is not None else []
 
122
        if TXT is None:
 
123
            self.TXT = []
 
124
        else:
 
125
            self.TXT = TXT
146
126
        self.domain = domain
147
127
        self.host = host
148
128
        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
129
    def rename(self):
156
130
        """Derived from the Avahi example code"""
157
131
        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)
 
132
            logger.critical(u"No suitable service name found after %i"
 
133
                            u" retries, exiting.", rename_count)
161
134
            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))
 
135
        name = server.GetAlternativeServiceName(name)
 
136
        logger.notice(u"Changing name to %r ...", name)
169
137
        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)
 
138
        self.add()
176
139
        self.rename_count += 1
177
140
    def remove(self):
178
141
        """Derived from the Avahi example code"""
179
 
        if self.group is not None:
180
 
            try:
181
 
                self.group.Free()
182
 
            except (dbus.exceptions.UnknownMethodException,
183
 
                    dbus.exceptions.DBusException) as e:
184
 
                pass
185
 
            self.group = None
186
 
        if self.entry_group_state_changed_match is not None:
187
 
            self.entry_group_state_changed_match.remove()
188
 
            self.entry_group_state_changed_match = None
 
142
        if group is not None:
 
143
            group.Reset()
189
144
    def add(self):
190
145
        """Derived from the Avahi example code"""
191
 
        self.remove()
192
 
        self.group = dbus.Interface(
193
 
            self.bus.get_object(avahi.DBUS_NAME,
194
 
                                self.server.EntryGroupNew(),
195
 
                                follow_name_owner_changes=True),
196
 
            avahi.DBUS_INTERFACE_ENTRY_GROUP)
197
 
        self.entry_group_state_changed_match = (
198
 
            self.group.connect_to_signal(
199
 
                'StateChanged', self .entry_group_state_changed))
200
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
201
 
                     self.name, self.type)
202
 
        self.group.AddService(
203
 
            self.interface,
204
 
            self.protocol,
205
 
            dbus.UInt32(0),     # flags
206
 
            self.name, self.type,
207
 
            self.domain, self.host,
208
 
            dbus.UInt16(self.port),
209
 
            avahi.string_array_to_txt_array(self.TXT))
210
 
        self.group.Commit()
211
 
    def entry_group_state_changed(self, state, error):
212
 
        """Derived from the Avahi example code"""
213
 
        logger.debug("Avahi entry group state change: %i", state)
214
 
        
215
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
216
 
            logger.debug("Zeroconf service established.")
217
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
218
 
            logger.info("Zeroconf service name collision.")
219
 
            self.rename()
220
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
221
 
            logger.critical("Avahi: Error in group state changed %s",
222
 
                            unicode(error))
223
 
            raise AvahiGroupError("State changed: %s"
224
 
                                  % unicode(error))
225
 
    def cleanup(self):
226
 
        """Derived from the Avahi example code"""
227
 
        self.remove()
228
 
    def server_state_changed(self, state, error=None):
229
 
        """Derived from the Avahi example code"""
230
 
        logger.debug("Avahi server state change: %i", state)
231
 
        bad_states = { avahi.SERVER_INVALID:
232
 
                           "Zeroconf server invalid",
233
 
                       avahi.SERVER_REGISTERING: None,
234
 
                       avahi.SERVER_COLLISION:
235
 
                           "Zeroconf server name collision",
236
 
                       avahi.SERVER_FAILURE:
237
 
                           "Zeroconf server failure" }
238
 
        if state in bad_states:
239
 
            if bad_states[state]:
240
 
                logger.error(bad_states[state])
241
 
            self.remove()
242
 
        elif state == avahi.SERVER_RUNNING:
243
 
            self.add()
244
 
        else:
245
 
            logger.debug("Unknown state: %r", state)
246
 
    def activate(self):
247
 
        """Derived from the Avahi example code"""
248
 
        if self.server is None:
249
 
            self.server = dbus.Interface(
250
 
                self.bus.get_object(avahi.DBUS_NAME,
251
 
                                    avahi.DBUS_PATH_SERVER,
252
 
                                    follow_name_owner_changes=True),
253
 
                avahi.DBUS_INTERFACE_SERVER)
254
 
        self.server.connect_to_signal("StateChanged",
255
 
                                 self.server_state_changed)
256
 
        self.server_state_changed(self.server.GetState())
 
146
        global group
 
147
        if group is None:
 
148
            group = dbus.Interface\
 
149
                    (bus.get_object(avahi.DBUS_NAME,
 
150
                                    server.EntryGroupNew()),
 
151
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
152
            group.connect_to_signal('StateChanged',
 
153
                                    entry_group_state_changed)
 
154
        logger.debug(u"Adding service '%s' of type '%s' ...",
 
155
                     service.name, service.type)
 
156
        group.AddService(
 
157
                self.interface,         # interface
 
158
                avahi.PROTO_INET6,      # protocol
 
159
                dbus.UInt32(0),         # flags
 
160
                self.name, self.type,
 
161
                self.domain, self.host,
 
162
                dbus.UInt16(self.port),
 
163
                avahi.string_array_to_txt_array(self.TXT))
 
164
        group.Commit()
 
165
 
 
166
# From the Avahi example code:
 
167
group = None                            # our entry group
 
168
# End of Avahi example code
257
169
 
258
170
 
259
171
class Client(object):
260
172
    """A representation of a client host served by this server.
261
 
    
262
173
    Attributes:
263
 
    _approved:   bool(); 'None' if not yet approved/disapproved
264
 
    approval_delay: datetime.timedelta(); Time to wait for approval
265
 
    approval_duration: datetime.timedelta(); Duration of one approval
266
 
    checker:    subprocess.Popen(); a running checker process used
267
 
                                    to see if the client lives.
268
 
                                    'None' if no process is running.
269
 
    checker_callback_tag: a gobject event source tag, or None
270
 
    checker_command: string; External command which is run to check
271
 
                     if client lives.  %() expansions are done at
 
174
    name:      string; from the config file, used in log messages
 
175
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
176
                 uniquely identify the client
 
177
    secret:    bytestring; sent verbatim (over TLS) to client
 
178
    fqdn:      string (FQDN); available for use by the checker command
 
179
    created:   datetime.datetime(); object creation, not client host
 
180
    last_checked_ok: datetime.datetime() or None if not yet checked OK
 
181
    timeout:   datetime.timedelta(); How long from last_checked_ok
 
182
                                     until this client is invalid
 
183
    interval:  datetime.timedelta(); How often to start a new checker
 
184
    stop_hook: If set, called by stop() as stop_hook(self)
 
185
    checker:   subprocess.Popen(); a running checker process used
 
186
                                   to see if the client lives.
 
187
                                   'None' if no process is running.
 
188
    checker_initiator_tag: a gobject event source tag, or None
 
189
    stop_initiator_tag:    - '' -
 
190
    checker_callback_tag:  - '' -
 
191
    checker_command: string; External command which is run to check if
 
192
                     client lives.  %() expansions are done at
272
193
                     runtime with vars(self) as dict, so that for
273
194
                     instance %(name)s can be used in the command.
274
 
    checker_initiator_tag: a gobject event source tag, or None
275
 
    created:    datetime.datetime(); (UTC) object creation
276
 
    current_checker_command: string; current running checker_command
277
 
    disable_hook:  If set, called by disable() as disable_hook(self)
278
 
    disable_initiator_tag: a gobject event source tag, or None
279
 
    enabled:    bool()
280
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
281
 
                 uniquely identify the client
282
 
    host:       string; available for use by the checker command
283
 
    interval:   datetime.timedelta(); How often to start a new checker
284
 
    last_approval_request: datetime.datetime(); (UTC) or None
285
 
    last_checked_ok: datetime.datetime(); (UTC) or None
286
 
    last_enabled: datetime.datetime(); (UTC)
287
 
    name:       string; from the config file, used in log messages and
288
 
                        D-Bus identifiers
289
 
    secret:     bytestring; sent verbatim (over TLS) to client
290
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
291
 
                                      until this client is disabled
292
 
    runtime_expansions: Allowed attributes for runtime expansion.
 
195
    Private attibutes:
 
196
    _timeout: Real variable for 'timeout'
 
197
    _interval: Real variable for 'interval'
 
198
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
199
    _interval_milliseconds: - '' -
293
200
    """
294
 
    
295
 
    runtime_expansions = ("approval_delay", "approval_duration",
296
 
                          "created", "enabled", "fingerprint",
297
 
                          "host", "interval", "last_checked_ok",
298
 
                          "last_enabled", "name", "timeout")
299
 
    
300
 
    @staticmethod
301
 
    def _timedelta_to_milliseconds(td):
302
 
        "Convert a datetime.timedelta() to milliseconds"
303
 
        return ((td.days * 24 * 60 * 60 * 1000)
304
 
                + (td.seconds * 1000)
305
 
                + (td.microseconds // 1000))
306
 
    
307
 
    def timeout_milliseconds(self):
308
 
        "Return the 'timeout' attribute in milliseconds"
309
 
        return self._timedelta_to_milliseconds(self.timeout)
310
 
    
311
 
    def interval_milliseconds(self):
312
 
        "Return the 'interval' attribute in milliseconds"
313
 
        return self._timedelta_to_milliseconds(self.interval)
314
 
 
315
 
    def approval_delay_milliseconds(self):
316
 
        return self._timedelta_to_milliseconds(self.approval_delay)
317
 
    
318
 
    def __init__(self, name = None, disable_hook=None, config=None):
319
 
        """Note: the 'checker' key in 'config' sets the
320
 
        'checker_command' attribute and *not* the 'checker'
321
 
        attribute."""
 
201
    def _set_timeout(self, timeout):
 
202
        "Setter function for 'timeout' attribute"
 
203
        self._timeout = timeout
 
204
        self._timeout_milliseconds = ((self.timeout.days
 
205
                                       * 24 * 60 * 60 * 1000)
 
206
                                      + (self.timeout.seconds * 1000)
 
207
                                      + (self.timeout.microseconds
 
208
                                         // 1000))
 
209
    timeout = property(lambda self: self._timeout,
 
210
                       _set_timeout)
 
211
    del _set_timeout
 
212
    def _set_interval(self, interval):
 
213
        "Setter function for 'interval' attribute"
 
214
        self._interval = interval
 
215
        self._interval_milliseconds = ((self.interval.days
 
216
                                        * 24 * 60 * 60 * 1000)
 
217
                                       + (self.interval.seconds
 
218
                                          * 1000)
 
219
                                       + (self.interval.microseconds
 
220
                                          // 1000))
 
221
    interval = property(lambda self: self._interval,
 
222
                        _set_interval)
 
223
    del _set_interval
 
224
    def __init__(self, name=None, stop_hook=None, fingerprint=None,
 
225
                 secret=None, secfile=None, fqdn=None, timeout=None,
 
226
                 interval=-1, checker=None):
 
227
        """Note: the 'checker' argument sets the 'checker_command'
 
228
        attribute and not the 'checker' attribute.."""
322
229
        self.name = name
323
 
        if config is None:
324
 
            config = {}
325
 
        logger.debug("Creating client %r", self.name)
326
 
        # Uppercase and remove spaces from fingerprint for later
327
 
        # comparison purposes with return value from the fingerprint()
328
 
        # function
329
 
        self.fingerprint = (config["fingerprint"].upper()
330
 
                            .replace(" ", ""))
331
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
332
 
        if "secret" in config:
333
 
            self.secret = config["secret"].decode("base64")
334
 
        elif "secfile" in config:
335
 
            with open(os.path.expanduser(os.path.expandvars
336
 
                                         (config["secfile"])),
337
 
                      "rb") as secfile:
338
 
                self.secret = secfile.read()
 
230
        logger.debug(u"Creating client %r", self.name)
 
231
        # Uppercase and remove spaces from fingerprint
 
232
        # for later comparison purposes with return value of
 
233
        # the fingerprint() function
 
234
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
235
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
 
236
        if secret:
 
237
            self.secret = secret.decode(u"base64")
 
238
        elif secfile:
 
239
            sf = open(secfile)
 
240
            self.secret = sf.read()
 
241
            sf.close()
339
242
        else:
340
 
            raise TypeError("No secret or secfile for client %s"
 
243
            raise TypeError(u"No secret or secfile for client %s"
341
244
                            % self.name)
342
 
        self.host = config.get("host", "")
343
 
        self.created = datetime.datetime.utcnow()
344
 
        self.enabled = False
345
 
        self.last_approval_request = None
346
 
        self.last_enabled = None
 
245
        self.fqdn = fqdn
 
246
        self.created = datetime.datetime.now()
347
247
        self.last_checked_ok = None
348
 
        self.timeout = string_to_delta(config["timeout"])
349
 
        self.interval = string_to_delta(config["interval"])
350
 
        self.disable_hook = disable_hook
 
248
        self.timeout = string_to_delta(timeout)
 
249
        self.interval = string_to_delta(interval)
 
250
        self.stop_hook = stop_hook
351
251
        self.checker = None
352
252
        self.checker_initiator_tag = None
353
 
        self.disable_initiator_tag = None
 
253
        self.stop_initiator_tag = None
354
254
        self.checker_callback_tag = None
355
 
        self.checker_command = config["checker"]
356
 
        self.current_checker_command = None
357
 
        self.last_connect = None
358
 
        self._approved = None
359
 
        self.approved_by_default = config.get("approved_by_default",
360
 
                                              True)
361
 
        self.approvals_pending = 0
362
 
        self.approval_delay = string_to_delta(
363
 
            config["approval_delay"])
364
 
        self.approval_duration = string_to_delta(
365
 
            config["approval_duration"])
366
 
        self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
367
 
    
368
 
    def send_changedstate(self):
369
 
        self.changedstate.acquire()
370
 
        self.changedstate.notify_all()
371
 
        self.changedstate.release()
372
 
        
373
 
    def enable(self):
 
255
        self.check_command = checker
 
256
    def start(self):
374
257
        """Start this client's checker and timeout hooks"""
375
 
        if getattr(self, "enabled", False):
376
 
            # Already enabled
377
 
            return
378
 
        self.send_changedstate()
379
 
        self.last_enabled = datetime.datetime.utcnow()
380
258
        # Schedule a new checker to be started an 'interval' from now,
381
259
        # and every interval from then on.
382
 
        self.checker_initiator_tag = (gobject.timeout_add
383
 
                                      (self.interval_milliseconds(),
384
 
                                       self.start_checker))
385
 
        # Schedule a disable() when 'timeout' has passed
386
 
        self.disable_initiator_tag = (gobject.timeout_add
387
 
                                   (self.timeout_milliseconds(),
388
 
                                    self.disable))
389
 
        self.enabled = True
 
260
        self.checker_initiator_tag = gobject.timeout_add\
 
261
                                     (self._interval_milliseconds,
 
262
                                      self.start_checker)
390
263
        # Also start a new checker *right now*.
391
264
        self.start_checker()
392
 
    
393
 
    def disable(self, quiet=True):
394
 
        """Disable this client."""
395
 
        if not getattr(self, "enabled", False):
 
265
        # Schedule a stop() when 'timeout' has passed
 
266
        self.stop_initiator_tag = gobject.timeout_add\
 
267
                                  (self._timeout_milliseconds,
 
268
                                   self.stop)
 
269
    def stop(self):
 
270
        """Stop this client.
 
271
        The possibility that a client might be restarted is left open,
 
272
        but not currently used."""
 
273
        # If this client doesn't have a secret, it is already stopped.
 
274
        if self.secret:
 
275
            logger.debug(u"Stopping client %s", self.name)
 
276
            self.secret = None
 
277
        else:
396
278
            return False
397
 
        if not quiet:
398
 
            self.send_changedstate()
399
 
        if not quiet:
400
 
            logger.info("Disabling client %s", self.name)
401
 
        if getattr(self, "disable_initiator_tag", False):
402
 
            gobject.source_remove(self.disable_initiator_tag)
403
 
            self.disable_initiator_tag = None
 
279
        if getattr(self, "stop_initiator_tag", False):
 
280
            gobject.source_remove(self.stop_initiator_tag)
 
281
            self.stop_initiator_tag = None
404
282
        if getattr(self, "checker_initiator_tag", False):
405
283
            gobject.source_remove(self.checker_initiator_tag)
406
284
            self.checker_initiator_tag = None
407
285
        self.stop_checker()
408
 
        if self.disable_hook:
409
 
            self.disable_hook(self)
410
 
        self.enabled = False
 
286
        if self.stop_hook:
 
287
            self.stop_hook(self)
411
288
        # Do not run this again if called by a gobject.timeout_add
412
289
        return False
413
 
    
414
290
    def __del__(self):
415
 
        self.disable_hook = None
416
 
        self.disable()
417
 
    
418
 
    def checker_callback(self, pid, condition, command):
 
291
        self.stop_hook = None
 
292
        self.stop()
 
293
    def checker_callback(self, pid, condition):
419
294
        """The checker has completed, so take appropriate actions."""
 
295
        now = datetime.datetime.now()
420
296
        self.checker_callback_tag = None
421
297
        self.checker = None
422
 
        if os.WIFEXITED(condition):
423
 
            exitstatus = os.WEXITSTATUS(condition)
424
 
            if exitstatus == 0:
425
 
                logger.info("Checker for %(name)s succeeded",
426
 
                            vars(self))
427
 
                self.checked_ok()
428
 
            else:
429
 
                logger.info("Checker for %(name)s failed",
430
 
                            vars(self))
431
 
        else:
432
 
            logger.warning("Checker for %(name)s crashed?",
 
298
        if os.WIFEXITED(condition) \
 
299
               and (os.WEXITSTATUS(condition) == 0):
 
300
            logger.debug(u"Checker for %(name)s succeeded",
 
301
                         vars(self))
 
302
            self.last_checked_ok = now
 
303
            gobject.source_remove(self.stop_initiator_tag)
 
304
            self.stop_initiator_tag = gobject.timeout_add\
 
305
                                      (self._timeout_milliseconds,
 
306
                                       self.stop)
 
307
        elif not os.WIFEXITED(condition):
 
308
            logger.warning(u"Checker for %(name)s crashed?",
433
309
                           vars(self))
434
 
    
435
 
    def checked_ok(self):
436
 
        """Bump up the timeout for this client.
437
 
        
438
 
        This should only be called when the client has been seen,
439
 
        alive and well.
440
 
        """
441
 
        self.last_checked_ok = datetime.datetime.utcnow()
442
 
        gobject.source_remove(self.disable_initiator_tag)
443
 
        self.disable_initiator_tag = (gobject.timeout_add
444
 
                                      (self.timeout_milliseconds(),
445
 
                                       self.disable))
446
 
    
447
 
    def need_approval(self):
448
 
        self.last_approval_request = datetime.datetime.utcnow()
449
 
    
 
310
        else:
 
311
            logger.debug(u"Checker for %(name)s failed",
 
312
                         vars(self))
450
313
    def start_checker(self):
451
314
        """Start a new checker subprocess if one is not running.
452
 
        
453
315
        If a checker already exists, leave it running and do
454
316
        nothing."""
455
317
        # The reason for not killing a running checker is that if we
458
320
        # client would inevitably timeout, since no checker would get
459
321
        # a chance to run to completion.  If we instead leave running
460
322
        # checkers alone, the checker would have to take more time
461
 
        # than 'timeout' for the client to be disabled, which is as it
462
 
        # should be.
463
 
        
464
 
        # If a checker exists, make sure it is not a zombie
465
 
        try:
466
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
467
 
        except (AttributeError, OSError) as error:
468
 
            if (isinstance(error, OSError)
469
 
                and error.errno != errno.ECHILD):
470
 
                raise error
471
 
        else:
472
 
            if pid:
473
 
                logger.warning("Checker was a zombie")
474
 
                gobject.source_remove(self.checker_callback_tag)
475
 
                self.checker_callback(pid, status,
476
 
                                      self.current_checker_command)
477
 
        # Start a new checker if needed
 
323
        # than 'timeout' for the client to be declared invalid, which
 
324
        # is as it should be.
478
325
        if self.checker is None:
479
326
            try:
480
 
                # In case checker_command has exactly one % operator
481
 
                command = self.checker_command % self.host
 
327
                # In case check_command has exactly one % operator
 
328
                command = self.check_command % self.fqdn
482
329
            except TypeError:
483
330
                # Escape attributes for the shell
484
 
                escaped_attrs = dict(
485
 
                    (attr,
486
 
                     re.escape(unicode(str(getattr(self, attr, "")),
487
 
                                       errors=
488
 
                                       'replace')))
489
 
                    for attr in
490
 
                    self.runtime_expansions)
491
 
 
 
331
                escaped_attrs = dict((key, re.escape(str(val)))
 
332
                                     for key, val in
 
333
                                     vars(self).iteritems())
492
334
                try:
493
 
                    command = self.checker_command % escaped_attrs
494
 
                except TypeError as error:
495
 
                    logger.error('Could not format string "%s":'
496
 
                                 ' %s', self.checker_command, error)
 
335
                    command = self.check_command % escaped_attrs
 
336
                except TypeError, error:
 
337
                    logger.error(u'Could not format string "%s":'
 
338
                                 u' %s', self.check_command, error)
497
339
                    return True # Try again later
498
 
            self.current_checker_command = command
499
340
            try:
500
 
                logger.info("Starting checker %r for %s",
501
 
                            command, self.name)
502
 
                # We don't need to redirect stdout and stderr, since
503
 
                # in normal mode, that is already done by daemon(),
504
 
                # and in debug mode we don't want to.  (Stdin is
505
 
                # always replaced by /dev/null.)
 
341
                logger.debug(u"Starting checker %r for %s",
 
342
                             command, self.name)
506
343
                self.checker = subprocess.Popen(command,
507
344
                                                close_fds=True,
508
345
                                                shell=True, cwd="/")
509
 
                self.checker_callback_tag = (gobject.child_watch_add
510
 
                                             (self.checker.pid,
511
 
                                              self.checker_callback,
512
 
                                              data=command))
513
 
                # The checker may have completed before the gobject
514
 
                # watch was added.  Check for this.
515
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
516
 
                if pid:
517
 
                    gobject.source_remove(self.checker_callback_tag)
518
 
                    self.checker_callback(pid, status, command)
519
 
            except OSError as error:
520
 
                logger.error("Failed to start subprocess: %s",
 
346
                self.checker_callback_tag = gobject.child_watch_add\
 
347
                                            (self.checker.pid,
 
348
                                             self.checker_callback)
 
349
            except subprocess.OSError, error:
 
350
                logger.error(u"Failed to start subprocess: %s",
521
351
                             error)
522
352
        # Re-run this periodically if run by gobject.timeout_add
523
353
        return True
524
 
    
525
354
    def stop_checker(self):
526
355
        """Force the checker process, if any, to stop."""
527
356
        if self.checker_callback_tag:
532
361
        logger.debug("Stopping checker for %(name)s", vars(self))
533
362
        try:
534
363
            os.kill(self.checker.pid, signal.SIGTERM)
535
 
            #time.sleep(0.5)
 
364
            #os.sleep(0.5)
536
365
            #if self.checker.poll() is None:
537
366
            #    os.kill(self.checker.pid, signal.SIGKILL)
538
 
        except OSError as error:
 
367
        except OSError, error:
539
368
            if error.errno != errno.ESRCH: # No such process
540
369
                raise
541
370
        self.checker = None
542
 
 
543
 
def dbus_service_property(dbus_interface, signature="v",
544
 
                          access="readwrite", byte_arrays=False):
545
 
    """Decorators for marking methods of a DBusObjectWithProperties to
546
 
    become properties on the D-Bus.
547
 
    
548
 
    The decorated method will be called with no arguments by "Get"
549
 
    and with one argument by "Set".
550
 
    
551
 
    The parameters, where they are supported, are the same as
552
 
    dbus.service.method, except there is only "signature", since the
553
 
    type from Get() and the type sent to Set() is the same.
554
 
    """
555
 
    # Encoding deeply encoded byte arrays is not supported yet by the
556
 
    # "Set" method, so we fail early here:
557
 
    if byte_arrays and signature != "ay":
558
 
        raise ValueError("Byte arrays not supported for non-'ay'"
559
 
                         " signature %r" % signature)
560
 
    def decorator(func):
561
 
        func._dbus_is_property = True
562
 
        func._dbus_interface = dbus_interface
563
 
        func._dbus_signature = signature
564
 
        func._dbus_access = access
565
 
        func._dbus_name = func.__name__
566
 
        if func._dbus_name.endswith("_dbus_property"):
567
 
            func._dbus_name = func._dbus_name[:-14]
568
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
569
 
        return func
570
 
    return decorator
571
 
 
572
 
 
573
 
class DBusPropertyException(dbus.exceptions.DBusException):
574
 
    """A base class for D-Bus property-related exceptions
575
 
    """
576
 
    def __unicode__(self):
577
 
        return unicode(str(self))
578
 
 
579
 
 
580
 
class DBusPropertyAccessException(DBusPropertyException):
581
 
    """A property's access permissions disallows an operation.
582
 
    """
583
 
    pass
584
 
 
585
 
 
586
 
class DBusPropertyNotFound(DBusPropertyException):
587
 
    """An attempt was made to access a non-existing property.
588
 
    """
589
 
    pass
590
 
 
591
 
 
592
 
class DBusObjectWithProperties(dbus.service.Object):
593
 
    """A D-Bus object with properties.
594
 
 
595
 
    Classes inheriting from this can use the dbus_service_property
596
 
    decorator to expose methods as D-Bus properties.  It exposes the
597
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
598
 
    """
599
 
    
600
 
    @staticmethod
601
 
    def _is_dbus_property(obj):
602
 
        return getattr(obj, "_dbus_is_property", False)
603
 
    
604
 
    def _get_all_dbus_properties(self):
605
 
        """Returns a generator of (name, attribute) pairs
606
 
        """
607
 
        return ((prop._dbus_name, prop)
608
 
                for name, prop in
609
 
                inspect.getmembers(self, self._is_dbus_property))
610
 
    
611
 
    def _get_dbus_property(self, interface_name, property_name):
612
 
        """Returns a bound method if one exists which is a D-Bus
613
 
        property with the specified name and interface.
614
 
        """
615
 
        for name in (property_name,
616
 
                     property_name + "_dbus_property"):
617
 
            prop = getattr(self, name, None)
618
 
            if (prop is None
619
 
                or not self._is_dbus_property(prop)
620
 
                or prop._dbus_name != property_name
621
 
                or (interface_name and prop._dbus_interface
622
 
                    and interface_name != prop._dbus_interface)):
623
 
                continue
624
 
            return prop
625
 
        # No such property
626
 
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
627
 
                                   + interface_name + "."
628
 
                                   + property_name)
629
 
    
630
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
631
 
                         out_signature="v")
632
 
    def Get(self, interface_name, property_name):
633
 
        """Standard D-Bus property Get() method, see D-Bus standard.
634
 
        """
635
 
        prop = self._get_dbus_property(interface_name, property_name)
636
 
        if prop._dbus_access == "write":
637
 
            raise DBusPropertyAccessException(property_name)
638
 
        value = prop()
639
 
        if not hasattr(value, "variant_level"):
640
 
            return value
641
 
        return type(value)(value, variant_level=value.variant_level+1)
642
 
    
643
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
644
 
    def Set(self, interface_name, property_name, value):
645
 
        """Standard D-Bus property Set() method, see D-Bus standard.
646
 
        """
647
 
        prop = self._get_dbus_property(interface_name, property_name)
648
 
        if prop._dbus_access == "read":
649
 
            raise DBusPropertyAccessException(property_name)
650
 
        if prop._dbus_get_args_options["byte_arrays"]:
651
 
            # The byte_arrays option is not supported yet on
652
 
            # signatures other than "ay".
653
 
            if prop._dbus_signature != "ay":
654
 
                raise ValueError
655
 
            value = dbus.ByteArray(''.join(unichr(byte)
656
 
                                           for byte in value))
657
 
        prop(value)
658
 
    
659
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
660
 
                         out_signature="a{sv}")
661
 
    def GetAll(self, interface_name):
662
 
        """Standard D-Bus property GetAll() method, see D-Bus
663
 
        standard.
664
 
 
665
 
        Note: Will not include properties with access="write".
666
 
        """
667
 
        all = {}
668
 
        for name, prop in self._get_all_dbus_properties():
669
 
            if (interface_name
670
 
                and interface_name != prop._dbus_interface):
671
 
                # Interface non-empty but did not match
672
 
                continue
673
 
            # Ignore write-only properties
674
 
            if prop._dbus_access == "write":
675
 
                continue
676
 
            value = prop()
677
 
            if not hasattr(value, "variant_level"):
678
 
                all[name] = value
679
 
                continue
680
 
            all[name] = type(value)(value, variant_level=
681
 
                                    value.variant_level+1)
682
 
        return dbus.Dictionary(all, signature="sv")
683
 
    
684
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
685
 
                         out_signature="s",
686
 
                         path_keyword='object_path',
687
 
                         connection_keyword='connection')
688
 
    def Introspect(self, object_path, connection):
689
 
        """Standard D-Bus method, overloaded to insert property tags.
690
 
        """
691
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
692
 
                                                   connection)
693
 
        try:
694
 
            document = xml.dom.minidom.parseString(xmlstring)
695
 
            def make_tag(document, name, prop):
696
 
                e = document.createElement("property")
697
 
                e.setAttribute("name", name)
698
 
                e.setAttribute("type", prop._dbus_signature)
699
 
                e.setAttribute("access", prop._dbus_access)
700
 
                return e
701
 
            for if_tag in document.getElementsByTagName("interface"):
702
 
                for tag in (make_tag(document, name, prop)
703
 
                            for name, prop
704
 
                            in self._get_all_dbus_properties()
705
 
                            if prop._dbus_interface
706
 
                            == if_tag.getAttribute("name")):
707
 
                    if_tag.appendChild(tag)
708
 
                # Add the names to the return values for the
709
 
                # "org.freedesktop.DBus.Properties" methods
710
 
                if (if_tag.getAttribute("name")
711
 
                    == "org.freedesktop.DBus.Properties"):
712
 
                    for cn in if_tag.getElementsByTagName("method"):
713
 
                        if cn.getAttribute("name") == "Get":
714
 
                            for arg in cn.getElementsByTagName("arg"):
715
 
                                if (arg.getAttribute("direction")
716
 
                                    == "out"):
717
 
                                    arg.setAttribute("name", "value")
718
 
                        elif cn.getAttribute("name") == "GetAll":
719
 
                            for arg in cn.getElementsByTagName("arg"):
720
 
                                if (arg.getAttribute("direction")
721
 
                                    == "out"):
722
 
                                    arg.setAttribute("name", "props")
723
 
            xmlstring = document.toxml("utf-8")
724
 
            document.unlink()
725
 
        except (AttributeError, xml.dom.DOMException,
726
 
                xml.parsers.expat.ExpatError) as error:
727
 
            logger.error("Failed to override Introspection method",
728
 
                         error)
729
 
        return xmlstring
730
 
 
731
 
 
732
 
class ClientDBus(Client, DBusObjectWithProperties):
733
 
    """A Client class using D-Bus
734
 
    
735
 
    Attributes:
736
 
    dbus_object_path: dbus.ObjectPath
737
 
    bus: dbus.SystemBus()
738
 
    """
739
 
    
740
 
    runtime_expansions = (Client.runtime_expansions
741
 
                          + ("dbus_object_path",))
742
 
    
743
 
    # dbus.service.Object doesn't use super(), so we can't either.
744
 
    
745
 
    def __init__(self, bus = None, *args, **kwargs):
746
 
        self._approvals_pending = 0
747
 
        self.bus = bus
748
 
        Client.__init__(self, *args, **kwargs)
749
 
        # Only now, when this client is initialized, can it show up on
750
 
        # the D-Bus
751
 
        client_object_name = unicode(self.name).translate(
752
 
            {ord("."): ord("_"),
753
 
             ord("-"): ord("_")})
754
 
        self.dbus_object_path = (dbus.ObjectPath
755
 
                                 ("/clients/" + client_object_name))
756
 
        DBusObjectWithProperties.__init__(self, self.bus,
757
 
                                          self.dbus_object_path)
758
 
        
759
 
    def _get_approvals_pending(self):
760
 
        return self._approvals_pending
761
 
    def _set_approvals_pending(self, value):
762
 
        old_value = self._approvals_pending
763
 
        self._approvals_pending = value
764
 
        bval = bool(value)
765
 
        if (hasattr(self, "dbus_object_path")
766
 
            and bval is not bool(old_value)):
767
 
            dbus_bool = dbus.Boolean(bval, variant_level=1)
768
 
            self.PropertyChanged(dbus.String("ApprovalPending"),
769
 
                                 dbus_bool)
770
 
 
771
 
    approvals_pending = property(_get_approvals_pending,
772
 
                                 _set_approvals_pending)
773
 
    del _get_approvals_pending, _set_approvals_pending
774
 
    
775
 
    @staticmethod
776
 
    def _datetime_to_dbus(dt, variant_level=0):
777
 
        """Convert a UTC datetime.datetime() to a D-Bus type."""
778
 
        return dbus.String(dt.isoformat(),
779
 
                           variant_level=variant_level)
780
 
    
781
 
    def enable(self):
782
 
        oldstate = getattr(self, "enabled", False)
783
 
        r = Client.enable(self)
784
 
        if oldstate != self.enabled:
785
 
            # Emit D-Bus signals
786
 
            self.PropertyChanged(dbus.String("Enabled"),
787
 
                                 dbus.Boolean(True, variant_level=1))
788
 
            self.PropertyChanged(
789
 
                dbus.String("LastEnabled"),
790
 
                self._datetime_to_dbus(self.last_enabled,
791
 
                                       variant_level=1))
792
 
        return r
793
 
    
794
 
    def disable(self, quiet = False):
795
 
        oldstate = getattr(self, "enabled", False)
796
 
        r = Client.disable(self, quiet=quiet)
797
 
        if not quiet and oldstate != self.enabled:
798
 
            # Emit D-Bus signal
799
 
            self.PropertyChanged(dbus.String("Enabled"),
800
 
                                 dbus.Boolean(False, variant_level=1))
801
 
        return r
802
 
    
803
 
    def __del__(self, *args, **kwargs):
804
 
        try:
805
 
            self.remove_from_connection()
806
 
        except LookupError:
807
 
            pass
808
 
        if hasattr(DBusObjectWithProperties, "__del__"):
809
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
810
 
        Client.__del__(self, *args, **kwargs)
811
 
    
812
 
    def checker_callback(self, pid, condition, command,
813
 
                         *args, **kwargs):
814
 
        self.checker_callback_tag = None
815
 
        self.checker = None
816
 
        # Emit D-Bus signal
817
 
        self.PropertyChanged(dbus.String("CheckerRunning"),
818
 
                             dbus.Boolean(False, variant_level=1))
819
 
        if os.WIFEXITED(condition):
820
 
            exitstatus = os.WEXITSTATUS(condition)
821
 
            # Emit D-Bus signal
822
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
823
 
                                  dbus.Int64(condition),
824
 
                                  dbus.String(command))
825
 
        else:
826
 
            # Emit D-Bus signal
827
 
            self.CheckerCompleted(dbus.Int16(-1),
828
 
                                  dbus.Int64(condition),
829
 
                                  dbus.String(command))
830
 
        
831
 
        return Client.checker_callback(self, pid, condition, command,
832
 
                                       *args, **kwargs)
833
 
    
834
 
    def checked_ok(self, *args, **kwargs):
835
 
        Client.checked_ok(self, *args, **kwargs)
836
 
        # Emit D-Bus signal
837
 
        self.PropertyChanged(
838
 
            dbus.String("LastCheckedOK"),
839
 
            (self._datetime_to_dbus(self.last_checked_ok,
840
 
                                    variant_level=1)))
841
 
    
842
 
    def need_approval(self, *args, **kwargs):
843
 
        r = Client.need_approval(self, *args, **kwargs)
844
 
        # Emit D-Bus signal
845
 
        self.PropertyChanged(
846
 
            dbus.String("LastApprovalRequest"),
847
 
            (self._datetime_to_dbus(self.last_approval_request,
848
 
                                    variant_level=1)))
849
 
        return r
850
 
    
851
 
    def start_checker(self, *args, **kwargs):
852
 
        old_checker = self.checker
853
 
        if self.checker is not None:
854
 
            old_checker_pid = self.checker.pid
855
 
        else:
856
 
            old_checker_pid = None
857
 
        r = Client.start_checker(self, *args, **kwargs)
858
 
        # Only if new checker process was started
859
 
        if (self.checker is not None
860
 
            and old_checker_pid != self.checker.pid):
861
 
            # Emit D-Bus signal
862
 
            self.CheckerStarted(self.current_checker_command)
863
 
            self.PropertyChanged(
864
 
                dbus.String("CheckerRunning"),
865
 
                dbus.Boolean(True, variant_level=1))
866
 
        return r
867
 
    
868
 
    def stop_checker(self, *args, **kwargs):
869
 
        old_checker = getattr(self, "checker", None)
870
 
        r = Client.stop_checker(self, *args, **kwargs)
871
 
        if (old_checker is not None
872
 
            and getattr(self, "checker", None) is None):
873
 
            self.PropertyChanged(dbus.String("CheckerRunning"),
874
 
                                 dbus.Boolean(False, variant_level=1))
875
 
        return r
876
 
 
877
 
    def _reset_approved(self):
878
 
        self._approved = None
879
 
        return False
880
 
    
881
 
    def approve(self, value=True):
882
 
        self.send_changedstate()
883
 
        self._approved = value
884
 
        gobject.timeout_add(self._timedelta_to_milliseconds
885
 
                            (self.approval_duration),
886
 
                            self._reset_approved)
887
 
    
888
 
    
889
 
    ## D-Bus methods, signals & properties
890
 
    _interface = "se.bsnet.fukt.Mandos.Client"
891
 
    
892
 
    ## Signals
893
 
    
894
 
    # CheckerCompleted - signal
895
 
    @dbus.service.signal(_interface, signature="nxs")
896
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
897
 
        "D-Bus signal"
898
 
        pass
899
 
    
900
 
    # CheckerStarted - signal
901
 
    @dbus.service.signal(_interface, signature="s")
902
 
    def CheckerStarted(self, command):
903
 
        "D-Bus signal"
904
 
        pass
905
 
    
906
 
    # PropertyChanged - signal
907
 
    @dbus.service.signal(_interface, signature="sv")
908
 
    def PropertyChanged(self, property, value):
909
 
        "D-Bus signal"
910
 
        pass
911
 
    
912
 
    # GotSecret - signal
913
 
    @dbus.service.signal(_interface)
914
 
    def GotSecret(self):
915
 
        """D-Bus signal
916
 
        Is sent after a successful transfer of secret from the Mandos
917
 
        server to mandos-client
918
 
        """
919
 
        pass
920
 
    
921
 
    # Rejected - signal
922
 
    @dbus.service.signal(_interface, signature="s")
923
 
    def Rejected(self, reason):
924
 
        "D-Bus signal"
925
 
        pass
926
 
    
927
 
    # NeedApproval - signal
928
 
    @dbus.service.signal(_interface, signature="tb")
929
 
    def NeedApproval(self, timeout, default):
930
 
        "D-Bus signal"
931
 
        return self.need_approval()
932
 
    
933
 
    ## Methods
934
 
    
935
 
    # Approve - method
936
 
    @dbus.service.method(_interface, in_signature="b")
937
 
    def Approve(self, value):
938
 
        self.approve(value)
939
 
    
940
 
    # CheckedOK - method
941
 
    @dbus.service.method(_interface)
942
 
    def CheckedOK(self):
943
 
        self.checked_ok()
944
 
    
945
 
    # Enable - method
946
 
    @dbus.service.method(_interface)
947
 
    def Enable(self):
948
 
        "D-Bus method"
949
 
        self.enable()
950
 
    
951
 
    # StartChecker - method
952
 
    @dbus.service.method(_interface)
953
 
    def StartChecker(self):
954
 
        "D-Bus method"
955
 
        self.start_checker()
956
 
    
957
 
    # Disable - method
958
 
    @dbus.service.method(_interface)
959
 
    def Disable(self):
960
 
        "D-Bus method"
961
 
        self.disable()
962
 
    
963
 
    # StopChecker - method
964
 
    @dbus.service.method(_interface)
965
 
    def StopChecker(self):
966
 
        self.stop_checker()
967
 
    
968
 
    ## Properties
969
 
    
970
 
    # ApprovalPending - property
971
 
    @dbus_service_property(_interface, signature="b", access="read")
972
 
    def ApprovalPending_dbus_property(self):
973
 
        return dbus.Boolean(bool(self.approvals_pending))
974
 
    
975
 
    # ApprovedByDefault - property
976
 
    @dbus_service_property(_interface, signature="b",
977
 
                           access="readwrite")
978
 
    def ApprovedByDefault_dbus_property(self, value=None):
979
 
        if value is None:       # get
980
 
            return dbus.Boolean(self.approved_by_default)
981
 
        self.approved_by_default = bool(value)
982
 
        # Emit D-Bus signal
983
 
        self.PropertyChanged(dbus.String("ApprovedByDefault"),
984
 
                             dbus.Boolean(value, variant_level=1))
985
 
    
986
 
    # ApprovalDelay - property
987
 
    @dbus_service_property(_interface, signature="t",
988
 
                           access="readwrite")
989
 
    def ApprovalDelay_dbus_property(self, value=None):
990
 
        if value is None:       # get
991
 
            return dbus.UInt64(self.approval_delay_milliseconds())
992
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
993
 
        # Emit D-Bus signal
994
 
        self.PropertyChanged(dbus.String("ApprovalDelay"),
995
 
                             dbus.UInt64(value, variant_level=1))
996
 
    
997
 
    # ApprovalDuration - property
998
 
    @dbus_service_property(_interface, signature="t",
999
 
                           access="readwrite")
1000
 
    def ApprovalDuration_dbus_property(self, value=None):
1001
 
        if value is None:       # get
1002
 
            return dbus.UInt64(self._timedelta_to_milliseconds(
1003
 
                    self.approval_duration))
1004
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
1005
 
        # Emit D-Bus signal
1006
 
        self.PropertyChanged(dbus.String("ApprovalDuration"),
1007
 
                             dbus.UInt64(value, variant_level=1))
1008
 
    
1009
 
    # Name - property
1010
 
    @dbus_service_property(_interface, signature="s", access="read")
1011
 
    def Name_dbus_property(self):
1012
 
        return dbus.String(self.name)
1013
 
    
1014
 
    # Fingerprint - property
1015
 
    @dbus_service_property(_interface, signature="s", access="read")
1016
 
    def Fingerprint_dbus_property(self):
1017
 
        return dbus.String(self.fingerprint)
1018
 
    
1019
 
    # Host - property
1020
 
    @dbus_service_property(_interface, signature="s",
1021
 
                           access="readwrite")
1022
 
    def Host_dbus_property(self, value=None):
1023
 
        if value is None:       # get
1024
 
            return dbus.String(self.host)
1025
 
        self.host = value
1026
 
        # Emit D-Bus signal
1027
 
        self.PropertyChanged(dbus.String("Host"),
1028
 
                             dbus.String(value, variant_level=1))
1029
 
    
1030
 
    # Created - property
1031
 
    @dbus_service_property(_interface, signature="s", access="read")
1032
 
    def Created_dbus_property(self):
1033
 
        return dbus.String(self._datetime_to_dbus(self.created))
1034
 
    
1035
 
    # LastEnabled - property
1036
 
    @dbus_service_property(_interface, signature="s", access="read")
1037
 
    def LastEnabled_dbus_property(self):
1038
 
        if self.last_enabled is None:
1039
 
            return dbus.String("")
1040
 
        return dbus.String(self._datetime_to_dbus(self.last_enabled))
1041
 
    
1042
 
    # Enabled - property
1043
 
    @dbus_service_property(_interface, signature="b",
1044
 
                           access="readwrite")
1045
 
    def Enabled_dbus_property(self, value=None):
1046
 
        if value is None:       # get
1047
 
            return dbus.Boolean(self.enabled)
1048
 
        if value:
1049
 
            self.enable()
1050
 
        else:
1051
 
            self.disable()
1052
 
    
1053
 
    # LastCheckedOK - property
1054
 
    @dbus_service_property(_interface, signature="s",
1055
 
                           access="readwrite")
1056
 
    def LastCheckedOK_dbus_property(self, value=None):
1057
 
        if value is not None:
1058
 
            self.checked_ok()
1059
 
            return
 
371
    def still_valid(self):
 
372
        """Has the timeout not yet passed for this client?"""
 
373
        now = datetime.datetime.now()
1060
374
        if self.last_checked_ok is None:
1061
 
            return dbus.String("")
1062
 
        return dbus.String(self._datetime_to_dbus(self
1063
 
                                                  .last_checked_ok))
1064
 
    
1065
 
    # LastApprovalRequest - property
1066
 
    @dbus_service_property(_interface, signature="s", access="read")
1067
 
    def LastApprovalRequest_dbus_property(self):
1068
 
        if self.last_approval_request is None:
1069
 
            return dbus.String("")
1070
 
        return dbus.String(self.
1071
 
                           _datetime_to_dbus(self
1072
 
                                             .last_approval_request))
1073
 
    
1074
 
    # Timeout - property
1075
 
    @dbus_service_property(_interface, signature="t",
1076
 
                           access="readwrite")
1077
 
    def Timeout_dbus_property(self, value=None):
1078
 
        if value is None:       # get
1079
 
            return dbus.UInt64(self.timeout_milliseconds())
1080
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1081
 
        # Emit D-Bus signal
1082
 
        self.PropertyChanged(dbus.String("Timeout"),
1083
 
                             dbus.UInt64(value, variant_level=1))
1084
 
        if getattr(self, "disable_initiator_tag", None) is None:
1085
 
            return
1086
 
        # Reschedule timeout
1087
 
        gobject.source_remove(self.disable_initiator_tag)
1088
 
        self.disable_initiator_tag = None
1089
 
        time_to_die = (self.
1090
 
                       _timedelta_to_milliseconds((self
1091
 
                                                   .last_checked_ok
1092
 
                                                   + self.timeout)
1093
 
                                                  - datetime.datetime
1094
 
                                                  .utcnow()))
1095
 
        if time_to_die <= 0:
1096
 
            # The timeout has passed
1097
 
            self.disable()
1098
 
        else:
1099
 
            self.disable_initiator_tag = (gobject.timeout_add
1100
 
                                          (time_to_die, self.disable))
1101
 
    
1102
 
    # Interval - property
1103
 
    @dbus_service_property(_interface, signature="t",
1104
 
                           access="readwrite")
1105
 
    def Interval_dbus_property(self, value=None):
1106
 
        if value is None:       # get
1107
 
            return dbus.UInt64(self.interval_milliseconds())
1108
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1109
 
        # Emit D-Bus signal
1110
 
        self.PropertyChanged(dbus.String("Interval"),
1111
 
                             dbus.UInt64(value, variant_level=1))
1112
 
        if getattr(self, "checker_initiator_tag", None) is None:
1113
 
            return
1114
 
        # Reschedule checker run
1115
 
        gobject.source_remove(self.checker_initiator_tag)
1116
 
        self.checker_initiator_tag = (gobject.timeout_add
1117
 
                                      (value, self.start_checker))
1118
 
        self.start_checker()    # Start one now, too
1119
 
 
1120
 
    # Checker - property
1121
 
    @dbus_service_property(_interface, signature="s",
1122
 
                           access="readwrite")
1123
 
    def Checker_dbus_property(self, value=None):
1124
 
        if value is None:       # get
1125
 
            return dbus.String(self.checker_command)
1126
 
        self.checker_command = value
1127
 
        # Emit D-Bus signal
1128
 
        self.PropertyChanged(dbus.String("Checker"),
1129
 
                             dbus.String(self.checker_command,
1130
 
                                         variant_level=1))
1131
 
    
1132
 
    # CheckerRunning - property
1133
 
    @dbus_service_property(_interface, signature="b",
1134
 
                           access="readwrite")
1135
 
    def CheckerRunning_dbus_property(self, value=None):
1136
 
        if value is None:       # get
1137
 
            return dbus.Boolean(self.checker is not None)
1138
 
        if value:
1139
 
            self.start_checker()
1140
 
        else:
1141
 
            self.stop_checker()
1142
 
    
1143
 
    # ObjectPath - property
1144
 
    @dbus_service_property(_interface, signature="o", access="read")
1145
 
    def ObjectPath_dbus_property(self):
1146
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1147
 
    
1148
 
    # Secret = property
1149
 
    @dbus_service_property(_interface, signature="ay",
1150
 
                           access="write", byte_arrays=True)
1151
 
    def Secret_dbus_property(self, value):
1152
 
        self.secret = str(value)
1153
 
    
1154
 
    del _interface
1155
 
 
1156
 
 
1157
 
class ProxyClient(object):
1158
 
    def __init__(self, child_pipe, fpr, address):
1159
 
        self._pipe = child_pipe
1160
 
        self._pipe.send(('init', fpr, address))
1161
 
        if not self._pipe.recv():
1162
 
            raise KeyError()
1163
 
 
1164
 
    def __getattribute__(self, name):
1165
 
        if(name == '_pipe'):
1166
 
            return super(ProxyClient, self).__getattribute__(name)
1167
 
        self._pipe.send(('getattr', name))
1168
 
        data = self._pipe.recv()
1169
 
        if data[0] == 'data':
1170
 
            return data[1]
1171
 
        if data[0] == 'function':
1172
 
            def func(*args, **kwargs):
1173
 
                self._pipe.send(('funcall', name, args, kwargs))
1174
 
                return self._pipe.recv()[1]
1175
 
            return func
1176
 
 
1177
 
    def __setattr__(self, name, value):
1178
 
        if(name == '_pipe'):
1179
 
            return super(ProxyClient, self).__setattr__(name, value)
1180
 
        self._pipe.send(('setattr', name, value))
1181
 
 
1182
 
 
1183
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1184
 
    """A class to handle client connections.
1185
 
    
1186
 
    Instantiated once for each connection to handle it.
 
375
            return now < (self.created + self.timeout)
 
376
        else:
 
377
            return now < (self.last_checked_ok + self.timeout)
 
378
 
 
379
 
 
380
def peer_certificate(session):
 
381
    "Return the peer's OpenPGP certificate as a bytestring"
 
382
    # If not an OpenPGP certificate...
 
383
    if gnutls.library.functions.gnutls_certificate_type_get\
 
384
            (session._c_object) \
 
385
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
386
        # ...do the normal thing
 
387
        return session.peer_certificate
 
388
    list_size = ctypes.c_uint()
 
389
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
390
        (session._c_object, ctypes.byref(list_size))
 
391
    if list_size.value == 0:
 
392
        return None
 
393
    cert = cert_list[0]
 
394
    return ctypes.string_at(cert.data, cert.size)
 
395
 
 
396
 
 
397
def fingerprint(openpgp):
 
398
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
399
    # New empty GnuTLS certificate
 
400
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
401
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
402
        (ctypes.byref(crt))
 
403
    # New GnuTLS "datum" with the OpenPGP public key
 
404
    datum = gnutls.library.types.gnutls_datum_t\
 
405
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
406
                     ctypes.POINTER(ctypes.c_ubyte)),
 
407
         ctypes.c_uint(len(openpgp)))
 
408
    # Import the OpenPGP public key into the certificate
 
409
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
410
        (crt,
 
411
         ctypes.byref(datum),
 
412
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
413
    # New buffer for the fingerprint
 
414
    buffer = ctypes.create_string_buffer(20)
 
415
    buffer_length = ctypes.c_size_t()
 
416
    # Get the fingerprint from the certificate into the buffer
 
417
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
418
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
419
    # Deinit the certificate
 
420
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
421
    # Convert the buffer to a Python bytestring
 
422
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
423
    # Convert the bytestring to hexadecimal notation
 
424
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
425
    return hex_fpr
 
426
 
 
427
 
 
428
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
429
    """A TCP request handler class.
 
430
    Instantiated by IPv6_TCPServer for each request to handle it.
1187
431
    Note: This will run in its own forked process."""
1188
432
    
1189
433
    def handle(self):
1190
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1191
 
            logger.info("TCP connection from: %s",
1192
 
                        unicode(self.client_address))
1193
 
            logger.debug("Pipe FD: %d",
1194
 
                         self.server.child_pipe.fileno())
1195
 
 
1196
 
            session = (gnutls.connection
1197
 
                       .ClientSession(self.request,
1198
 
                                      gnutls.connection
1199
 
                                      .X509Credentials()))
1200
 
 
1201
 
            # Note: gnutls.connection.X509Credentials is really a
1202
 
            # generic GnuTLS certificate credentials object so long as
1203
 
            # no X.509 keys are added to it.  Therefore, we can use it
1204
 
            # here despite using OpenPGP certificates.
1205
 
 
1206
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
1207
 
            #                      "+AES-256-CBC", "+SHA1",
1208
 
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
1209
 
            #                      "+DHE-DSS"))
1210
 
            # Use a fallback default, since this MUST be set.
1211
 
            priority = self.server.gnutls_priority
1212
 
            if priority is None:
1213
 
                priority = "NORMAL"
1214
 
            (gnutls.library.functions
1215
 
             .gnutls_priority_set_direct(session._c_object,
1216
 
                                         priority, None))
1217
 
 
1218
 
            # Start communication using the Mandos protocol
1219
 
            # Get protocol number
1220
 
            line = self.request.makefile().readline()
1221
 
            logger.debug("Protocol version: %r", line)
1222
 
            try:
1223
 
                if int(line.strip().split()[0]) > 1:
1224
 
                    raise RuntimeError
1225
 
            except (ValueError, IndexError, RuntimeError) as error:
1226
 
                logger.error("Unknown protocol version: %s", error)
1227
 
                return
1228
 
 
1229
 
            # Start GnuTLS connection
1230
 
            try:
1231
 
                session.handshake()
1232
 
            except gnutls.errors.GNUTLSError as error:
1233
 
                logger.warning("Handshake failed: %s", error)
1234
 
                # Do not run session.bye() here: the session is not
1235
 
                # established.  Just abandon the request.
1236
 
                return
1237
 
            logger.debug("Handshake succeeded")
1238
 
 
1239
 
            approval_required = False
1240
 
            try:
1241
 
                try:
1242
 
                    fpr = self.fingerprint(self.peer_certificate
1243
 
                                           (session))
1244
 
                except (TypeError,
1245
 
                        gnutls.errors.GNUTLSError) as error:
1246
 
                    logger.warning("Bad certificate: %s", error)
1247
 
                    return
1248
 
                logger.debug("Fingerprint: %s", fpr)
1249
 
 
1250
 
                try:
1251
 
                    client = ProxyClient(child_pipe, fpr,
1252
 
                                         self.client_address)
1253
 
                except KeyError:
1254
 
                    return
1255
 
                
1256
 
                if client.approval_delay:
1257
 
                    delay = client.approval_delay
1258
 
                    client.approvals_pending += 1
1259
 
                    approval_required = True
1260
 
                
1261
 
                while True:
1262
 
                    if not client.enabled:
1263
 
                        logger.warning("Client %s is disabled",
1264
 
                                       client.name)
1265
 
                        if self.server.use_dbus:
1266
 
                            # Emit D-Bus signal
1267
 
                            client.Rejected("Disabled")                    
1268
 
                        return
1269
 
                    
1270
 
                    if client._approved or not client.approval_delay:
1271
 
                        #We are approved or approval is disabled
1272
 
                        break
1273
 
                    elif client._approved is None:
1274
 
                        logger.info("Client %s needs approval",
1275
 
                                    client.name)
1276
 
                        if self.server.use_dbus:
1277
 
                            # Emit D-Bus signal
1278
 
                            client.NeedApproval(
1279
 
                                client.approval_delay_milliseconds(),
1280
 
                                client.approved_by_default)
1281
 
                    else:
1282
 
                        logger.warning("Client %s was not approved",
1283
 
                                       client.name)
1284
 
                        if self.server.use_dbus:
1285
 
                            # Emit D-Bus signal
1286
 
                            client.Rejected("Denied")
1287
 
                        return
1288
 
                    
1289
 
                    #wait until timeout or approved
1290
 
                    #x = float(client._timedelta_to_milliseconds(delay))
1291
 
                    time = datetime.datetime.now()
1292
 
                    client.changedstate.acquire()
1293
 
                    client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1294
 
                    client.changedstate.release()
1295
 
                    time2 = datetime.datetime.now()
1296
 
                    if (time2 - time) >= delay:
1297
 
                        if not client.approved_by_default:
1298
 
                            logger.warning("Client %s timed out while"
1299
 
                                           " waiting for approval",
1300
 
                                           client.name)
1301
 
                            if self.server.use_dbus:
1302
 
                                # Emit D-Bus signal
1303
 
                                client.Rejected("Approval timed out")
1304
 
                            return
1305
 
                        else:
1306
 
                            break
1307
 
                    else:
1308
 
                        delay -= time2 - time
1309
 
                
1310
 
                sent_size = 0
1311
 
                while sent_size < len(client.secret):
1312
 
                    try:
1313
 
                        sent = session.send(client.secret[sent_size:])
1314
 
                    except gnutls.errors.GNUTLSError as error:
1315
 
                        logger.warning("gnutls send failed")
1316
 
                        return
1317
 
                    logger.debug("Sent: %d, remaining: %d",
1318
 
                                 sent, len(client.secret)
1319
 
                                 - (sent_size + sent))
1320
 
                    sent_size += sent
1321
 
 
1322
 
                logger.info("Sending secret to %s", client.name)
1323
 
                # bump the timeout as if seen
1324
 
                client.checked_ok()
1325
 
                if self.server.use_dbus:
1326
 
                    # Emit D-Bus signal
1327
 
                    client.GotSecret()
1328
 
            
1329
 
            finally:
1330
 
                if approval_required:
1331
 
                    client.approvals_pending -= 1
1332
 
                try:
1333
 
                    session.bye()
1334
 
                except gnutls.errors.GNUTLSError as error:
1335
 
                    logger.warning("GnuTLS bye failed")
1336
 
    
1337
 
    @staticmethod
1338
 
    def peer_certificate(session):
1339
 
        "Return the peer's OpenPGP certificate as a bytestring"
1340
 
        # If not an OpenPGP certificate...
1341
 
        if (gnutls.library.functions
1342
 
            .gnutls_certificate_type_get(session._c_object)
1343
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1344
 
            # ...do the normal thing
1345
 
            return session.peer_certificate
1346
 
        list_size = ctypes.c_uint(1)
1347
 
        cert_list = (gnutls.library.functions
1348
 
                     .gnutls_certificate_get_peers
1349
 
                     (session._c_object, ctypes.byref(list_size)))
1350
 
        if not bool(cert_list) and list_size.value != 0:
1351
 
            raise gnutls.errors.GNUTLSError("error getting peer"
1352
 
                                            " certificate")
1353
 
        if list_size.value == 0:
1354
 
            return None
1355
 
        cert = cert_list[0]
1356
 
        return ctypes.string_at(cert.data, cert.size)
1357
 
    
1358
 
    @staticmethod
1359
 
    def fingerprint(openpgp):
1360
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1361
 
        # New GnuTLS "datum" with the OpenPGP public key
1362
 
        datum = (gnutls.library.types
1363
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1364
 
                                             ctypes.POINTER
1365
 
                                             (ctypes.c_ubyte)),
1366
 
                                 ctypes.c_uint(len(openpgp))))
1367
 
        # New empty GnuTLS certificate
1368
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1369
 
        (gnutls.library.functions
1370
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1371
 
        # Import the OpenPGP public key into the certificate
1372
 
        (gnutls.library.functions
1373
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1374
 
                                    gnutls.library.constants
1375
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1376
 
        # Verify the self signature in the key
1377
 
        crtverify = ctypes.c_uint()
1378
 
        (gnutls.library.functions
1379
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1380
 
                                         ctypes.byref(crtverify)))
1381
 
        if crtverify.value != 0:
1382
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1383
 
            raise (gnutls.errors.CertificateSecurityError
1384
 
                   ("Verify failed"))
1385
 
        # New buffer for the fingerprint
1386
 
        buf = ctypes.create_string_buffer(20)
1387
 
        buf_len = ctypes.c_size_t()
1388
 
        # Get the fingerprint from the certificate into the buffer
1389
 
        (gnutls.library.functions
1390
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1391
 
                                             ctypes.byref(buf_len)))
1392
 
        # Deinit the certificate
1393
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1394
 
        # Convert the buffer to a Python bytestring
1395
 
        fpr = ctypes.string_at(buf, buf_len.value)
1396
 
        # Convert the bytestring to hexadecimal notation
1397
 
        hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
1398
 
        return hex_fpr
1399
 
 
1400
 
 
1401
 
class MultiprocessingMixIn(object):
1402
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1403
 
    def sub_process_main(self, request, address):
1404
 
        try:
1405
 
            self.finish_request(request, address)
1406
 
        except:
1407
 
            self.handle_error(request, address)
1408
 
        self.close_request(request)
1409
 
            
1410
 
    def process_request(self, request, address):
1411
 
        """Start a new process to process the request."""
1412
 
        multiprocessing.Process(target = self.sub_process_main,
1413
 
                                args = (request, address)).start()
1414
 
 
1415
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1416
 
    """ adds a pipe to the MixIn """
1417
 
    def process_request(self, request, client_address):
1418
 
        """Overrides and wraps the original process_request().
1419
 
        
1420
 
        This function creates a new pipe in self.pipe
1421
 
        """
1422
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1423
 
 
1424
 
        super(MultiprocessingMixInWithPipe,
1425
 
              self).process_request(request, client_address)
1426
 
        self.child_pipe.close()
1427
 
        self.add_pipe(parent_pipe)
1428
 
 
1429
 
    def add_pipe(self, parent_pipe):
1430
 
        """Dummy function; override as necessary"""
1431
 
        raise NotImplementedError
1432
 
 
1433
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1434
 
                     socketserver.TCPServer, object):
1435
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1436
 
    
 
434
        logger.debug(u"TCP connection from: %s",
 
435
                     unicode(self.client_address))
 
436
        session = gnutls.connection.ClientSession\
 
437
                  (self.request, gnutls.connection.X509Credentials())
 
438
        
 
439
        line = self.request.makefile().readline()
 
440
        logger.debug(u"Protocol version: %r", line)
 
441
        try:
 
442
            if int(line.strip().split()[0]) > 1:
 
443
                raise RuntimeError
 
444
        except (ValueError, IndexError, RuntimeError), error:
 
445
            logger.error(u"Unknown protocol version: %s", error)
 
446
            return
 
447
        
 
448
        # Note: gnutls.connection.X509Credentials is really a generic
 
449
        # GnuTLS certificate credentials object so long as no X.509
 
450
        # keys are added to it.  Therefore, we can use it here despite
 
451
        # using OpenPGP certificates.
 
452
        
 
453
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
454
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
455
        #                "+DHE-DSS"))
 
456
        priority = "NORMAL"             # Fallback default, since this
 
457
                                        # MUST be set.
 
458
        if self.server.settings["priority"]:
 
459
            priority = self.server.settings["priority"]
 
460
        gnutls.library.functions.gnutls_priority_set_direct\
 
461
            (session._c_object, priority, None);
 
462
        
 
463
        try:
 
464
            session.handshake()
 
465
        except gnutls.errors.GNUTLSError, error:
 
466
            logger.debug(u"Handshake failed: %s", error)
 
467
            # Do not run session.bye() here: the session is not
 
468
            # established.  Just abandon the request.
 
469
            return
 
470
        try:
 
471
            fpr = fingerprint(peer_certificate(session))
 
472
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
473
            logger.debug(u"Bad certificate: %s", error)
 
474
            session.bye()
 
475
            return
 
476
        logger.debug(u"Fingerprint: %s", fpr)
 
477
        client = None
 
478
        for c in self.server.clients:
 
479
            if c.fingerprint == fpr:
 
480
                client = c
 
481
                break
 
482
        if not client:
 
483
            logger.debug(u"Client not found for fingerprint: %s", fpr)
 
484
            session.bye()
 
485
            return
 
486
        # Have to check if client.still_valid(), since it is possible
 
487
        # that the client timed out while establishing the GnuTLS
 
488
        # session.
 
489
        if not client.still_valid():
 
490
            logger.debug(u"Client %(name)s is invalid", vars(client))
 
491
            session.bye()
 
492
            return
 
493
        sent_size = 0
 
494
        while sent_size < len(client.secret):
 
495
            sent = session.send(client.secret[sent_size:])
 
496
            logger.debug(u"Sent: %d, remaining: %d",
 
497
                         sent, len(client.secret)
 
498
                         - (sent_size + sent))
 
499
            sent_size += sent
 
500
        session.bye()
 
501
 
 
502
 
 
503
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
504
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
1437
505
    Attributes:
1438
 
        enabled:        Boolean; whether this server is activated yet
1439
 
        interface:      None or a network interface name (string)
1440
 
        use_ipv6:       Boolean; to use IPv6 or not
 
506
        settings:       Server settings
 
507
        clients:        Set() of Client objects
1441
508
    """
1442
 
    def __init__(self, server_address, RequestHandlerClass,
1443
 
                 interface=None, use_ipv6=True):
1444
 
        self.interface = interface
1445
 
        if use_ipv6:
1446
 
            self.address_family = socket.AF_INET6
1447
 
        socketserver.TCPServer.__init__(self, server_address,
1448
 
                                        RequestHandlerClass)
 
509
    address_family = socket.AF_INET6
 
510
    def __init__(self, *args, **kwargs):
 
511
        if "settings" in kwargs:
 
512
            self.settings = kwargs["settings"]
 
513
            del kwargs["settings"]
 
514
        if "clients" in kwargs:
 
515
            self.clients = kwargs["clients"]
 
516
            del kwargs["clients"]
 
517
        return super(type(self), self).__init__(*args, **kwargs)
1449
518
    def server_bind(self):
1450
519
        """This overrides the normal server_bind() function
1451
520
        to bind to an interface if one was specified, and also NOT to
1452
521
        bind to an address or port if they were not specified."""
1453
 
        if self.interface is not None:
1454
 
            if SO_BINDTODEVICE is None:
1455
 
                logger.error("SO_BINDTODEVICE does not exist;"
1456
 
                             " cannot bind to interface %s",
1457
 
                             self.interface)
1458
 
            else:
1459
 
                try:
1460
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1461
 
                                           SO_BINDTODEVICE,
1462
 
                                           str(self.interface
1463
 
                                               + '\0'))
1464
 
                except socket.error as error:
1465
 
                    if error[0] == errno.EPERM:
1466
 
                        logger.error("No permission to"
1467
 
                                     " bind to interface %s",
1468
 
                                     self.interface)
1469
 
                    elif error[0] == errno.ENOPROTOOPT:
1470
 
                        logger.error("SO_BINDTODEVICE not available;"
1471
 
                                     " cannot bind to interface %s",
1472
 
                                     self.interface)
1473
 
                    else:
1474
 
                        raise
 
522
        if self.settings["interface"]:
 
523
            # 25 is from /usr/include/asm-i486/socket.h
 
524
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
525
            try:
 
526
                self.socket.setsockopt(socket.SOL_SOCKET,
 
527
                                       SO_BINDTODEVICE,
 
528
                                       self.settings["interface"])
 
529
            except socket.error, error:
 
530
                if error[0] == errno.EPERM:
 
531
                    logger.warning(u"No permission to"
 
532
                                   u" bind to interface %s",
 
533
                                   self.settings["interface"])
 
534
                else:
 
535
                    raise error
1475
536
        # Only bind(2) the socket if we really need to.
1476
537
        if self.server_address[0] or self.server_address[1]:
1477
538
            if not self.server_address[0]:
1478
 
                if self.address_family == socket.AF_INET6:
1479
 
                    any_address = "::" # in6addr_any
1480
 
                else:
1481
 
                    any_address = socket.INADDR_ANY
1482
 
                self.server_address = (any_address,
 
539
                in6addr_any = "::"
 
540
                self.server_address = (in6addr_any,
1483
541
                                       self.server_address[1])
1484
 
            elif not self.server_address[1]:
 
542
            elif self.server_address[1] is None:
1485
543
                self.server_address = (self.server_address[0],
1486
544
                                       0)
1487
 
#                 if self.interface:
1488
 
#                     self.server_address = (self.server_address[0],
1489
 
#                                            0, # port
1490
 
#                                            0, # flowinfo
1491
 
#                                            if_nametoindex
1492
 
#                                            (self.interface))
1493
 
            return socketserver.TCPServer.server_bind(self)
1494
 
 
1495
 
 
1496
 
class MandosServer(IPv6_TCPServer):
1497
 
    """Mandos server.
1498
 
    
1499
 
    Attributes:
1500
 
        clients:        set of Client objects
1501
 
        gnutls_priority GnuTLS priority string
1502
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1503
 
    
1504
 
    Assumes a gobject.MainLoop event loop.
1505
 
    """
1506
 
    def __init__(self, server_address, RequestHandlerClass,
1507
 
                 interface=None, use_ipv6=True, clients=None,
1508
 
                 gnutls_priority=None, use_dbus=True):
1509
 
        self.enabled = False
1510
 
        self.clients = clients
1511
 
        if self.clients is None:
1512
 
            self.clients = set()
1513
 
        self.use_dbus = use_dbus
1514
 
        self.gnutls_priority = gnutls_priority
1515
 
        IPv6_TCPServer.__init__(self, server_address,
1516
 
                                RequestHandlerClass,
1517
 
                                interface = interface,
1518
 
                                use_ipv6 = use_ipv6)
1519
 
    def server_activate(self):
1520
 
        if self.enabled:
1521
 
            return socketserver.TCPServer.server_activate(self)
1522
 
    def enable(self):
1523
 
        self.enabled = True
1524
 
    def add_pipe(self, parent_pipe):
1525
 
        # Call "handle_ipc" for both data and EOF events
1526
 
        gobject.io_add_watch(parent_pipe.fileno(),
1527
 
                             gobject.IO_IN | gobject.IO_HUP,
1528
 
                             functools.partial(self.handle_ipc,
1529
 
                                               parent_pipe = parent_pipe))
1530
 
        
1531
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1532
 
                   client_object=None):
1533
 
        condition_names = {
1534
 
            gobject.IO_IN: "IN",   # There is data to read.
1535
 
            gobject.IO_OUT: "OUT", # Data can be written (without
1536
 
                                    # blocking).
1537
 
            gobject.IO_PRI: "PRI", # There is urgent data to read.
1538
 
            gobject.IO_ERR: "ERR", # Error condition.
1539
 
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
1540
 
                                    # broken, usually for pipes and
1541
 
                                    # sockets).
1542
 
            }
1543
 
        conditions_string = ' | '.join(name
1544
 
                                       for cond, name in
1545
 
                                       condition_names.iteritems()
1546
 
                                       if cond & condition)
1547
 
        # error or the other end of multiprocessing.Pipe has closed
1548
 
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1549
 
            return False
1550
 
        
1551
 
        # Read a request from the child
1552
 
        request = parent_pipe.recv()
1553
 
        command = request[0]
1554
 
        
1555
 
        if command == 'init':
1556
 
            fpr = request[1]
1557
 
            address = request[2]
1558
 
            
1559
 
            for c in self.clients:
1560
 
                if c.fingerprint == fpr:
1561
 
                    client = c
1562
 
                    break
1563
 
            else:
1564
 
                logger.warning("Client not found for fingerprint: %s, ad"
1565
 
                               "dress: %s", fpr, address)
1566
 
                if self.use_dbus:
1567
 
                    # Emit D-Bus signal
1568
 
                    mandos_dbus_service.ClientNotFound(fpr, address[0])
1569
 
                parent_pipe.send(False)
1570
 
                return False
1571
 
            
1572
 
            gobject.io_add_watch(parent_pipe.fileno(),
1573
 
                                 gobject.IO_IN | gobject.IO_HUP,
1574
 
                                 functools.partial(self.handle_ipc,
1575
 
                                                   parent_pipe = parent_pipe,
1576
 
                                                   client_object = client))
1577
 
            parent_pipe.send(True)
1578
 
            # remove the old hook in favor of the new above hook on same fileno
1579
 
            return False
1580
 
        if command == 'funcall':
1581
 
            funcname = request[1]
1582
 
            args = request[2]
1583
 
            kwargs = request[3]
1584
 
            
1585
 
            parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1586
 
 
1587
 
        if command == 'getattr':
1588
 
            attrname = request[1]
1589
 
            if callable(client_object.__getattribute__(attrname)):
1590
 
                parent_pipe.send(('function',))
1591
 
            else:
1592
 
                parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1593
 
        
1594
 
        if command == 'setattr':
1595
 
            attrname = request[1]
1596
 
            value = request[2]
1597
 
            setattr(client_object, attrname, value)
1598
 
 
1599
 
        return True
 
545
            return super(type(self), self).server_bind()
1600
546
 
1601
547
 
1602
548
def string_to_delta(interval):
1603
549
    """Parse a string and return a datetime.timedelta
1604
 
    
 
550
 
1605
551
    >>> string_to_delta('7d')
1606
552
    datetime.timedelta(7)
1607
553
    >>> string_to_delta('60s')
1610
556
    datetime.timedelta(0, 3600)
1611
557
    >>> string_to_delta('24h')
1612
558
    datetime.timedelta(1)
1613
 
    >>> string_to_delta('1w')
 
559
    >>> string_to_delta(u'1w')
1614
560
    datetime.timedelta(7)
1615
 
    >>> string_to_delta('5m 30s')
1616
 
    datetime.timedelta(0, 330)
1617
561
    """
1618
 
    timevalue = datetime.timedelta(0)
1619
 
    for s in interval.split():
1620
 
        try:
1621
 
            suffix = unicode(s[-1])
1622
 
            value = int(s[:-1])
1623
 
            if suffix == "d":
1624
 
                delta = datetime.timedelta(value)
1625
 
            elif suffix == "s":
1626
 
                delta = datetime.timedelta(0, value)
1627
 
            elif suffix == "m":
1628
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1629
 
            elif suffix == "h":
1630
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1631
 
            elif suffix == "w":
1632
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1633
 
            else:
1634
 
                raise ValueError("Unknown suffix %r" % suffix)
1635
 
        except (ValueError, IndexError) as e:
1636
 
            raise ValueError(*(e.args))
1637
 
        timevalue += delta
1638
 
    return timevalue
1639
 
 
 
562
    try:
 
563
        suffix=unicode(interval[-1])
 
564
        value=int(interval[:-1])
 
565
        if suffix == u"d":
 
566
            delta = datetime.timedelta(value)
 
567
        elif suffix == u"s":
 
568
            delta = datetime.timedelta(0, value)
 
569
        elif suffix == u"m":
 
570
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
571
        elif suffix == u"h":
 
572
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
573
        elif suffix == u"w":
 
574
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
575
        else:
 
576
            raise ValueError
 
577
    except (ValueError, IndexError):
 
578
        raise ValueError
 
579
    return delta
 
580
 
 
581
 
 
582
def server_state_changed(state):
 
583
    """Derived from the Avahi example code"""
 
584
    if state == avahi.SERVER_COLLISION:
 
585
        logger.warning(u"Server name collision")
 
586
        service.remove()
 
587
    elif state == avahi.SERVER_RUNNING:
 
588
        service.add()
 
589
 
 
590
 
 
591
def entry_group_state_changed(state, error):
 
592
    """Derived from the Avahi example code"""
 
593
    logger.debug(u"state change: %i", state)
 
594
    
 
595
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
596
        logger.debug(u"Service established.")
 
597
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
598
        logger.warning(u"Service name collision.")
 
599
        service.rename()
 
600
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
601
        logger.critical(u"Error in group state changed %s",
 
602
                        unicode(error))
 
603
        raise AvahiGroupError("State changed: %s", str(error))
1640
604
 
1641
605
def if_nametoindex(interface):
1642
 
    """Call the C function if_nametoindex(), or equivalent
1643
 
    
1644
 
    Note: This function cannot accept a unicode string."""
 
606
    """Call the C function if_nametoindex(), or equivalent"""
1645
607
    global if_nametoindex
1646
608
    try:
1647
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1648
 
                          (ctypes.util.find_library("c"))
1649
 
                          .if_nametoindex)
 
609
        if "ctypes.util" not in sys.modules:
 
610
            import ctypes.util
 
611
        if_nametoindex = ctypes.cdll.LoadLibrary\
 
612
            (ctypes.util.find_library("c")).if_nametoindex
1650
613
    except (OSError, AttributeError):
1651
 
        logger.warning("Doing if_nametoindex the hard way")
 
614
        if "struct" not in sys.modules:
 
615
            import struct
 
616
        if "fcntl" not in sys.modules:
 
617
            import fcntl
1652
618
        def if_nametoindex(interface):
1653
619
            "Get an interface index the hard way, i.e. using fcntl()"
1654
620
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
1655
 
            with contextlib.closing(socket.socket()) as s:
1656
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1657
 
                                    struct.pack(str("16s16x"),
1658
 
                                                interface))
1659
 
            interface_index = struct.unpack(str("I"),
1660
 
                                            ifreq[16:20])[0]
 
621
            s = socket.socket()
 
622
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
623
                                struct.pack("16s16x", interface))
 
624
            s.close()
 
625
            interface_index = struct.unpack("I", ifreq[16:20])[0]
1661
626
            return interface_index
1662
627
    return if_nametoindex(interface)
1663
628
 
1664
629
 
1665
 
def daemon(nochdir = False, noclose = False):
 
630
def daemon(nochdir, noclose):
1666
631
    """See daemon(3).  Standard BSD Unix function.
1667
 
    
1668
632
    This should really exist as os.daemon, but it doesn't (yet)."""
1669
633
    if os.fork():
1670
634
        sys.exit()
1671
635
    os.setsid()
1672
636
    if not nochdir:
1673
637
        os.chdir("/")
1674
 
    if os.fork():
1675
 
        sys.exit()
1676
638
    if not noclose:
1677
639
        # Close all standard open file descriptors
1678
640
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1679
641
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1680
642
            raise OSError(errno.ENODEV,
1681
 
                          "%s not a character device"
1682
 
                          % os.path.devnull)
 
643
                          "/dev/null not a character device")
1683
644
        os.dup2(null, sys.stdin.fileno())
1684
645
        os.dup2(null, sys.stdout.fileno())
1685
646
        os.dup2(null, sys.stderr.fileno())
1688
649
 
1689
650
 
1690
651
def main():
1691
 
    
1692
 
    ##################################################################
1693
 
    # Parsing of options, both command line and config file
1694
 
    
1695
 
    parser = argparse.ArgumentParser()
1696
 
    parser.add_argument("-v", "--version", action="version",
1697
 
                        version = "%%(prog)s %s" % version,
1698
 
                        help="show version number and exit")
1699
 
    parser.add_argument("-i", "--interface", metavar="IF",
1700
 
                        help="Bind to interface IF")
1701
 
    parser.add_argument("-a", "--address",
1702
 
                        help="Address to listen for requests on")
1703
 
    parser.add_argument("-p", "--port", type=int,
1704
 
                        help="Port number to receive requests on")
1705
 
    parser.add_argument("--check", action="store_true",
1706
 
                        help="Run self-test")
1707
 
    parser.add_argument("--debug", action="store_true",
1708
 
                        help="Debug mode; run in foreground and log"
1709
 
                        " to terminal")
1710
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
1711
 
                        help="Debug level for stdout output")
1712
 
    parser.add_argument("--priority", help="GnuTLS"
1713
 
                        " priority string (see GnuTLS documentation)")
1714
 
    parser.add_argument("--servicename",
1715
 
                        metavar="NAME", help="Zeroconf service name")
1716
 
    parser.add_argument("--configdir",
1717
 
                        default="/etc/mandos", metavar="DIR",
1718
 
                        help="Directory to search for configuration"
1719
 
                        " files")
1720
 
    parser.add_argument("--no-dbus", action="store_false",
1721
 
                        dest="use_dbus", help="Do not provide D-Bus"
1722
 
                        " system bus interface")
1723
 
    parser.add_argument("--no-ipv6", action="store_false",
1724
 
                        dest="use_ipv6", help="Do not use IPv6")
1725
 
    options = parser.parse_args()
 
652
    global main_loop_started
 
653
    main_loop_started = False
 
654
    
 
655
    parser = OptionParser()
 
656
    parser.add_option("-i", "--interface", type="string",
 
657
                      metavar="IF", help="Bind to interface IF")
 
658
    parser.add_option("-a", "--address", type="string",
 
659
                      help="Address to listen for requests on")
 
660
    parser.add_option("-p", "--port", type="int",
 
661
                      help="Port number to receive requests on")
 
662
    parser.add_option("--check", action="store_true", default=False,
 
663
                      help="Run self-test")
 
664
    parser.add_option("--debug", action="store_true", default=False,
 
665
                      help="Debug mode; run in foreground and log to"
 
666
                      " terminal")
 
667
    parser.add_option("--priority", type="string", help="GnuTLS"
 
668
                      " priority string (see GnuTLS documentation)")
 
669
    parser.add_option("--servicename", type="string", metavar="NAME",
 
670
                      help="Zeroconf service name")
 
671
    parser.add_option("--configdir", type="string",
 
672
                      default="/etc/mandos", metavar="DIR",
 
673
                      help="Directory to search for configuration"
 
674
                      " files")
 
675
    (options, args) = parser.parse_args()
1726
676
    
1727
677
    if options.check:
1728
678
        import doctest
1737
687
                        "priority":
1738
688
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1739
689
                        "servicename": "Mandos",
1740
 
                        "use_dbus": "True",
1741
 
                        "use_ipv6": "True",
1742
 
                        "debuglevel": "",
1743
690
                        }
1744
691
    
1745
692
    # Parse config file for server-global settings
1746
 
    server_config = configparser.SafeConfigParser(server_defaults)
 
693
    server_config = ConfigParser.SafeConfigParser(server_defaults)
1747
694
    del server_defaults
1748
 
    server_config.read(os.path.join(options.configdir,
1749
 
                                    "mandos.conf"))
 
695
    server_config.read(os.path.join(options.configdir, "server.conf"))
 
696
    server_section = "server"
1750
697
    # Convert the SafeConfigParser object to a dict
1751
 
    server_settings = server_config.defaults()
1752
 
    # Use the appropriate methods on the non-string config options
1753
 
    for option in ("debug", "use_dbus", "use_ipv6"):
1754
 
        server_settings[option] = server_config.getboolean("DEFAULT",
1755
 
                                                           option)
1756
 
    if server_settings["port"]:
1757
 
        server_settings["port"] = server_config.getint("DEFAULT",
1758
 
                                                       "port")
 
698
    server_settings = dict(server_config.items(server_section))
 
699
    # Use getboolean on the boolean config option
 
700
    server_settings["debug"] = server_config.getboolean\
 
701
                               (server_section, "debug")
1759
702
    del server_config
1760
703
    
1761
704
    # Override the settings from the config file with command line
1762
705
    # options, if set.
1763
706
    for option in ("interface", "address", "port", "debug",
1764
 
                   "priority", "servicename", "configdir",
1765
 
                   "use_dbus", "use_ipv6", "debuglevel"):
 
707
                   "priority", "servicename", "configdir"):
1766
708
        value = getattr(options, option)
1767
709
        if value is not None:
1768
710
            server_settings[option] = value
1769
711
    del options
1770
 
    # Force all strings to be unicode
1771
 
    for option in server_settings.keys():
1772
 
        if type(server_settings[option]) is str:
1773
 
            server_settings[option] = unicode(server_settings[option])
1774
712
    # Now we have our good server settings in "server_settings"
1775
713
    
1776
 
    ##################################################################
1777
 
    
1778
 
    # For convenience
1779
 
    debug = server_settings["debug"]
1780
 
    debuglevel = server_settings["debuglevel"]
1781
 
    use_dbus = server_settings["use_dbus"]
1782
 
    use_ipv6 = server_settings["use_ipv6"]
1783
 
 
1784
 
    if server_settings["servicename"] != "Mandos":
1785
 
        syslogger.setFormatter(logging.Formatter
1786
 
                               ('Mandos (%s) [%%(process)d]:'
1787
 
                                ' %%(levelname)s: %%(message)s'
1788
 
                                % server_settings["servicename"]))
1789
 
    
1790
714
    # Parse config file with clients
1791
715
    client_defaults = { "timeout": "1h",
1792
716
                        "interval": "5m",
1793
 
                        "checker": "fping -q -- %%(host)s",
1794
 
                        "host": "",
1795
 
                        "approval_delay": "0s",
1796
 
                        "approval_duration": "1s",
 
717
                        "checker": "fping -q -- %%(fqdn)s",
1797
718
                        }
1798
 
    client_config = configparser.SafeConfigParser(client_defaults)
 
719
    client_config = ConfigParser.SafeConfigParser(client_defaults)
1799
720
    client_config.read(os.path.join(server_settings["configdir"],
1800
721
                                    "clients.conf"))
1801
722
    
1802
 
    global mandos_dbus_service
1803
 
    mandos_dbus_service = None
1804
 
    
1805
 
    tcp_server = MandosServer((server_settings["address"],
1806
 
                               server_settings["port"]),
1807
 
                              ClientHandler,
1808
 
                              interface=(server_settings["interface"]
1809
 
                                         or None),
1810
 
                              use_ipv6=use_ipv6,
1811
 
                              gnutls_priority=
1812
 
                              server_settings["priority"],
1813
 
                              use_dbus=use_dbus)
1814
 
    if not debug:
1815
 
        pidfilename = "/var/run/mandos.pid"
1816
 
        try:
1817
 
            pidfile = open(pidfilename, "w")
1818
 
        except IOError:
1819
 
            logger.error("Could not open file %r", pidfilename)
1820
 
    
1821
 
    try:
1822
 
        uid = pwd.getpwnam("_mandos").pw_uid
1823
 
        gid = pwd.getpwnam("_mandos").pw_gid
1824
 
    except KeyError:
1825
 
        try:
1826
 
            uid = pwd.getpwnam("mandos").pw_uid
1827
 
            gid = pwd.getpwnam("mandos").pw_gid
1828
 
        except KeyError:
1829
 
            try:
1830
 
                uid = pwd.getpwnam("nobody").pw_uid
1831
 
                gid = pwd.getpwnam("nobody").pw_gid
1832
 
            except KeyError:
1833
 
                uid = 65534
1834
 
                gid = 65534
1835
 
    try:
1836
 
        os.setgid(gid)
1837
 
        os.setuid(uid)
1838
 
    except OSError as error:
1839
 
        if error[0] != errno.EPERM:
1840
 
            raise error
1841
 
    
1842
 
    if not debug and not debuglevel:
1843
 
        syslogger.setLevel(logging.WARNING)
1844
 
        console.setLevel(logging.WARNING)
1845
 
    if debuglevel:
1846
 
        level = getattr(logging, debuglevel.upper())
1847
 
        syslogger.setLevel(level)
1848
 
        console.setLevel(level)
1849
 
 
1850
 
    if debug:
1851
 
        # Enable all possible GnuTLS debugging
1852
 
        
1853
 
        # "Use a log level over 10 to enable all debugging options."
1854
 
        # - GnuTLS manual
1855
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1856
 
        
1857
 
        @gnutls.library.types.gnutls_log_func
1858
 
        def debug_gnutls(level, string):
1859
 
            logger.debug("GnuTLS: %s", string[:-1])
1860
 
        
1861
 
        (gnutls.library.functions
1862
 
         .gnutls_global_set_log_function(debug_gnutls))
1863
 
        
1864
 
        # Redirect stdin so all checkers get /dev/null
1865
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1866
 
        os.dup2(null, sys.stdin.fileno())
1867
 
        if null > 2:
1868
 
            os.close(null)
1869
 
    else:
1870
 
        # No console logging
1871
 
        logger.removeHandler(console)
1872
 
    
1873
 
    # Need to fork before connecting to D-Bus
1874
 
    if not debug:
1875
 
        # Close all input and output, do double fork, etc.
1876
 
        daemon()
 
723
    global service
 
724
    service = AvahiService(name = server_settings["servicename"],
 
725
                           type = "_mandos._tcp", );
 
726
    if server_settings["interface"]:
 
727
        service.interface = if_nametoindex(server_settings["interface"])
1877
728
    
1878
729
    global main_loop
 
730
    global bus
 
731
    global server
1879
732
    # From the Avahi example code
1880
733
    DBusGMainLoop(set_as_default=True )
1881
734
    main_loop = gobject.MainLoop()
1882
735
    bus = dbus.SystemBus()
 
736
    server = dbus.Interface(
 
737
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
738
            avahi.DBUS_INTERFACE_SERVER )
1883
739
    # End of Avahi example code
1884
 
    if use_dbus:
1885
 
        try:
1886
 
            bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",
1887
 
                                            bus, do_not_queue=True)
1888
 
        except dbus.exceptions.NameExistsException as e:
1889
 
            logger.error(unicode(e) + ", disabling D-Bus")
1890
 
            use_dbus = False
1891
 
            server_settings["use_dbus"] = False
1892
 
            tcp_server.use_dbus = False
1893
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1894
 
    service = AvahiService(name = server_settings["servicename"],
1895
 
                           servicetype = "_mandos._tcp",
1896
 
                           protocol = protocol, bus = bus)
1897
 
    if server_settings["interface"]:
1898
 
        service.interface = (if_nametoindex
1899
 
                             (str(server_settings["interface"])))
1900
 
    
1901
 
    global multiprocessing_manager
1902
 
    multiprocessing_manager = multiprocessing.Manager()
1903
 
    
1904
 
    client_class = Client
1905
 
    if use_dbus:
1906
 
        client_class = functools.partial(ClientDBus, bus = bus)
1907
 
    def client_config_items(config, section):
1908
 
        special_settings = {
1909
 
            "approved_by_default":
1910
 
                lambda: config.getboolean(section,
1911
 
                                          "approved_by_default"),
1912
 
            }
1913
 
        for name, value in config.items(section):
1914
 
            try:
1915
 
                yield (name, special_settings[name]())
1916
 
            except KeyError:
1917
 
                yield (name, value)
1918
 
    
1919
 
    tcp_server.clients.update(set(
1920
 
            client_class(name = section,
1921
 
                         config= dict(client_config_items(
1922
 
                        client_config, section)))
1923
 
            for section in client_config.sections()))
1924
 
    if not tcp_server.clients:
1925
 
        logger.warning("No clients defined")
1926
 
        
1927
 
    if not debug:
1928
 
        try:
1929
 
            with pidfile:
1930
 
                pid = os.getpid()
1931
 
                pidfile.write(str(pid) + "\n".encode("utf-8"))
1932
 
            del pidfile
1933
 
        except IOError:
1934
 
            logger.error("Could not write to file %r with PID %d",
1935
 
                         pidfilename, pid)
1936
 
        except NameError:
1937
 
            # "pidfile" was never created
1938
 
            pass
1939
 
        del pidfilename
1940
 
        
 
740
    
 
741
    debug = server_settings["debug"]
 
742
    
 
743
    if debug:
 
744
        console = logging.StreamHandler()
 
745
        # console.setLevel(logging.DEBUG)
 
746
        console.setFormatter(logging.Formatter\
 
747
                             ('%(levelname)s: %(message)s'))
 
748
        logger.addHandler(console)
 
749
        del console
 
750
    
 
751
    clients = Set()
 
752
    def remove_from_clients(client):
 
753
        clients.remove(client)
 
754
        if not clients:
 
755
            logger.debug(u"No clients left, exiting")
 
756
            sys.exit()
 
757
    
 
758
    clients.update(Set(Client(name=section,
 
759
                              stop_hook = remove_from_clients,
 
760
                              **(dict(client_config\
 
761
                                      .items(section))))
 
762
                       for section in client_config.sections()))
 
763
    
 
764
    if not debug:
 
765
        daemon(False, False)
 
766
    
 
767
    def cleanup():
 
768
        "Cleanup function; run on exit"
 
769
        global group
 
770
        # From the Avahi example code
 
771
        if not group is None:
 
772
            group.Free()
 
773
            group = None
 
774
        # End of Avahi example code
 
775
        
 
776
        while clients:
 
777
            client = clients.pop()
 
778
            client.stop_hook = None
 
779
            client.stop()
 
780
    
 
781
    atexit.register(cleanup)
 
782
    
 
783
    if not debug:
1941
784
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1942
 
 
1943
785
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1944
786
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1945
787
    
1946
 
    if use_dbus:
1947
 
        class MandosDBusService(dbus.service.Object):
1948
 
            """A D-Bus proxy object"""
1949
 
            def __init__(self):
1950
 
                dbus.service.Object.__init__(self, bus, "/")
1951
 
            _interface = "se.bsnet.fukt.Mandos"
1952
 
            
1953
 
            @dbus.service.signal(_interface, signature="o")
1954
 
            def ClientAdded(self, objpath):
1955
 
                "D-Bus signal"
1956
 
                pass
1957
 
            
1958
 
            @dbus.service.signal(_interface, signature="ss")
1959
 
            def ClientNotFound(self, fingerprint, address):
1960
 
                "D-Bus signal"
1961
 
                pass
1962
 
            
1963
 
            @dbus.service.signal(_interface, signature="os")
1964
 
            def ClientRemoved(self, objpath, name):
1965
 
                "D-Bus signal"
1966
 
                pass
1967
 
            
1968
 
            @dbus.service.method(_interface, out_signature="ao")
1969
 
            def GetAllClients(self):
1970
 
                "D-Bus method"
1971
 
                return dbus.Array(c.dbus_object_path
1972
 
                                  for c in tcp_server.clients)
1973
 
            
1974
 
            @dbus.service.method(_interface,
1975
 
                                 out_signature="a{oa{sv}}")
1976
 
            def GetAllClientsWithProperties(self):
1977
 
                "D-Bus method"
1978
 
                return dbus.Dictionary(
1979
 
                    ((c.dbus_object_path, c.GetAll(""))
1980
 
                     for c in tcp_server.clients),
1981
 
                    signature="oa{sv}")
1982
 
            
1983
 
            @dbus.service.method(_interface, in_signature="o")
1984
 
            def RemoveClient(self, object_path):
1985
 
                "D-Bus method"
1986
 
                for c in tcp_server.clients:
1987
 
                    if c.dbus_object_path == object_path:
1988
 
                        tcp_server.clients.remove(c)
1989
 
                        c.remove_from_connection()
1990
 
                        # Don't signal anything except ClientRemoved
1991
 
                        c.disable(quiet=True)
1992
 
                        # Emit D-Bus signal
1993
 
                        self.ClientRemoved(object_path, c.name)
1994
 
                        return
1995
 
                raise KeyError(object_path)
1996
 
            
1997
 
            del _interface
1998
 
        
1999
 
        mandos_dbus_service = MandosDBusService()
2000
 
    
2001
 
    def cleanup():
2002
 
        "Cleanup function; run on exit"
2003
 
        service.cleanup()
2004
 
        
2005
 
        while tcp_server.clients:
2006
 
            client = tcp_server.clients.pop()
2007
 
            if use_dbus:
2008
 
                client.remove_from_connection()
2009
 
            client.disable_hook = None
2010
 
            # Don't signal anything except ClientRemoved
2011
 
            client.disable(quiet=True)
2012
 
            if use_dbus:
2013
 
                # Emit D-Bus signal
2014
 
                mandos_dbus_service.ClientRemoved(client.dbus_object_path,
2015
 
                                                  client.name)
2016
 
    
2017
 
    atexit.register(cleanup)
2018
 
    
2019
 
    for client in tcp_server.clients:
2020
 
        if use_dbus:
2021
 
            # Emit D-Bus signal
2022
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
2023
 
        client.enable()
2024
 
    
2025
 
    tcp_server.enable()
2026
 
    tcp_server.server_activate()
2027
 
    
 
788
    for client in clients:
 
789
        client.start()
 
790
    
 
791
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
792
                                 server_settings["port"]),
 
793
                                tcp_handler,
 
794
                                settings=server_settings,
 
795
                                clients=clients)
2028
796
    # Find out what port we got
2029
797
    service.port = tcp_server.socket.getsockname()[1]
2030
 
    if use_ipv6:
2031
 
        logger.info("Now listening on address %r, port %d,"
2032
 
                    " flowinfo %d, scope_id %d"
2033
 
                    % tcp_server.socket.getsockname())
2034
 
    else:                       # IPv4
2035
 
        logger.info("Now listening on address %r, port %d"
2036
 
                    % tcp_server.socket.getsockname())
 
798
    logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
 
799
                 u" scope_id %d" % tcp_server.socket.getsockname())
2037
800
    
2038
801
    #service.interface = tcp_server.socket.getsockname()[3]
2039
802
    
2040
803
    try:
2041
804
        # From the Avahi example code
 
805
        server.connect_to_signal("StateChanged", server_state_changed)
2042
806
        try:
2043
 
            service.activate()
2044
 
        except dbus.exceptions.DBusException as error:
2045
 
            logger.critical("DBusException: %s", error)
2046
 
            cleanup()
 
807
            server_state_changed(server.GetState())
 
808
        except dbus.exceptions.DBusException, error:
 
809
            logger.critical(u"DBusException: %s", error)
2047
810
            sys.exit(1)
2048
811
        # End of Avahi example code
2049
812
        
2050
813
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2051
814
                             lambda *args, **kwargs:
2052
 
                             (tcp_server.handle_request
2053
 
                              (*args[2:], **kwargs) or True))
 
815
                             tcp_server.handle_request\
 
816
                             (*args[2:], **kwargs) or True)
2054
817
        
2055
818
        logger.debug("Starting main loop")
 
819
        main_loop_started = True
2056
820
        main_loop.run()
2057
 
    except AvahiError as error:
2058
 
        logger.critical("AvahiError: %s", error)
2059
 
        cleanup()
 
821
    except AvahiError, error:
 
822
        logger.critical(u"AvahiError: %s" + unicode(error))
2060
823
        sys.exit(1)
2061
824
    except KeyboardInterrupt:
2062
825
        if debug:
2063
 
            print("", file=sys.stderr)
2064
 
        logger.debug("Server received KeyboardInterrupt")
2065
 
    logger.debug("Server exiting")
2066
 
    # Must run before the D-Bus bus name gets deregistered
2067
 
    cleanup()
 
826
            print
2068
827
 
2069
828
if __name__ == '__main__':
2070
829
    main()