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Lines of Context:
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# This program is partly derived from an example program for an Avahi
7
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# 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
# methods "add" and "remove" in the "AvahiService" class, the
 
10
# "server_state_changed" and "entry_group_state_changed" functions,
 
11
# and some lines in "main".
12
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
 
import types
66
57
 
67
58
import dbus
68
 
import dbus.service
69
59
import gobject
70
60
import avahi
71
61
from dbus.mainloop.glib import DBusGMainLoop
72
62
import ctypes
73
 
import ctypes.util
74
 
import xml.dom.minidom
75
 
import inspect
76
 
 
77
 
try:
78
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
79
 
except AttributeError:
80
 
    try:
81
 
        from IN import SO_BINDTODEVICE
82
 
    except ImportError:
83
 
        SO_BINDTODEVICE = None
84
 
 
85
 
 
86
 
version = "1.3.1"
87
 
 
88
 
#logger = logging.getLogger('mandos')
 
63
 
 
64
version = "1.0"
 
65
 
89
66
logger = logging.Logger('mandos')
90
 
syslogger = (logging.handlers.SysLogHandler
91
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
92
 
              address = str("/dev/log")))
93
 
syslogger.setFormatter(logging.Formatter
94
 
                       ('Mandos [%(process)d]: %(levelname)s:'
95
 
                        ' %(message)s'))
 
67
syslogger = logging.handlers.SysLogHandler\
 
68
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
69
             address = "/dev/log")
 
70
syslogger.setFormatter(logging.Formatter\
 
71
                        ('Mandos: %(levelname)s: %(message)s'))
96
72
logger.addHandler(syslogger)
97
73
 
98
74
console = logging.StreamHandler()
99
 
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
100
 
                                       ' %(levelname)s:'
 
75
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
101
76
                                       ' %(message)s'))
102
77
logger.addHandler(console)
103
78
 
104
79
class AvahiError(Exception):
105
 
    def __init__(self, value, *args, **kwargs):
 
80
    def __init__(self, value):
106
81
        self.value = value
107
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
108
 
    def __unicode__(self):
109
 
        return unicode(repr(self.value))
 
82
    def __str__(self):
 
83
        return repr(self.value)
110
84
 
111
85
class AvahiServiceError(AvahiError):
112
86
    pass
117
91
 
118
92
class AvahiService(object):
119
93
    """An Avahi (Zeroconf) service.
120
 
    
121
94
    Attributes:
122
95
    interface: integer; avahi.IF_UNSPEC or an interface index.
123
96
               Used to optionally bind to the specified interface.
131
104
    max_renames: integer; maximum number of renames
132
105
    rename_count: integer; counter so we only rename after collisions
133
106
                  a sensible number of times
134
 
    group: D-Bus Entry Group
135
 
    server: D-Bus Server
136
 
    bus: dbus.SystemBus()
137
107
    """
138
108
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
139
 
                 servicetype = None, port = None, TXT = None,
140
 
                 domain = "", host = "", max_renames = 32768,
141
 
                 protocol = avahi.PROTO_UNSPEC, bus = None):
 
109
                 type = None, port = None, TXT = None, domain = "",
 
110
                 host = "", max_renames = 32768):
142
111
        self.interface = interface
143
112
        self.name = name
144
 
        self.type = servicetype
 
113
        self.type = type
145
114
        self.port = port
146
 
        self.TXT = TXT if TXT is not None else []
 
115
        if TXT is None:
 
116
            self.TXT = []
 
117
        else:
 
118
            self.TXT = TXT
147
119
        self.domain = domain
148
120
        self.host = host
149
121
        self.rename_count = 0
150
 
        self.max_renames = max_renames
151
 
        self.protocol = protocol
152
 
        self.group = None       # our entry group
153
 
        self.server = None
154
 
        self.bus = bus
155
 
        self.entry_group_state_changed_match = None
156
122
    def rename(self):
157
123
        """Derived from the Avahi example code"""
158
124
        if self.rename_count >= self.max_renames:
159
 
            logger.critical("No suitable Zeroconf service name found"
160
 
                            " after %i retries, exiting.",
161
 
                            self.rename_count)
 
125
            logger.critical(u"No suitable service name found after %i"
 
126
                            u" retries, exiting.", rename_count)
162
127
            raise AvahiServiceError("Too many renames")
163
 
        self.name = unicode(self.server.GetAlternativeServiceName(self.name))
164
 
        logger.info("Changing Zeroconf service name to %r ...",
165
 
                    self.name)
166
 
        syslogger.setFormatter(logging.Formatter
167
 
                               ('Mandos (%s) [%%(process)d]:'
168
 
                                ' %%(levelname)s: %%(message)s'
169
 
                                % self.name))
 
128
        name = server.GetAlternativeServiceName(name)
 
129
        logger.error(u"Changing name to %r ...", name)
 
130
        syslogger.setFormatter(logging.Formatter\
 
131
                               ('Mandos (%s): %%(levelname)s:'
 
132
                               ' %%(message)s' % name))
170
133
        self.remove()
171
 
        try:
172
 
            self.add()
173
 
        except dbus.exceptions.DBusException as error:
174
 
            logger.critical("DBusException: %s", error)
175
 
            self.cleanup()
176
 
            os._exit(1)
 
134
        self.add()
177
135
        self.rename_count += 1
178
136
    def remove(self):
179
137
        """Derived from the Avahi example code"""
180
 
        if self.entry_group_state_changed_match is not None:
181
 
            self.entry_group_state_changed_match.remove()
182
 
            self.entry_group_state_changed_match = None
183
 
        if self.group is not None:
184
 
            self.group.Reset()
 
138
        if group is not None:
 
139
            group.Reset()
185
140
    def add(self):
186
141
        """Derived from the Avahi example code"""
187
 
        self.remove()
188
 
        if self.group is None:
189
 
            self.group = dbus.Interface(
190
 
                self.bus.get_object(avahi.DBUS_NAME,
191
 
                                    self.server.EntryGroupNew()),
192
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
193
 
        self.entry_group_state_changed_match = (
194
 
            self.group.connect_to_signal(
195
 
                'StateChanged', self .entry_group_state_changed))
196
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
197
 
                     self.name, self.type)
198
 
        self.group.AddService(
199
 
            self.interface,
200
 
            self.protocol,
201
 
            dbus.UInt32(0),     # flags
202
 
            self.name, self.type,
203
 
            self.domain, self.host,
204
 
            dbus.UInt16(self.port),
205
 
            avahi.string_array_to_txt_array(self.TXT))
206
 
        self.group.Commit()
207
 
    def entry_group_state_changed(self, state, error):
208
 
        """Derived from the Avahi example code"""
209
 
        logger.debug("Avahi entry group state change: %i", state)
210
 
        
211
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
212
 
            logger.debug("Zeroconf service established.")
213
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
214
 
            logger.info("Zeroconf service name collision.")
215
 
            self.rename()
216
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
217
 
            logger.critical("Avahi: Error in group state changed %s",
218
 
                            unicode(error))
219
 
            raise AvahiGroupError("State changed: %s"
220
 
                                  % unicode(error))
221
 
    def cleanup(self):
222
 
        """Derived from the Avahi example code"""
223
 
        if self.group is not None:
224
 
            try:
225
 
                self.group.Free()
226
 
            except (dbus.exceptions.UnknownMethodException,
227
 
                    dbus.exceptions.DBusException) as e:
228
 
                pass
229
 
            self.group = None
230
 
        self.remove()
231
 
    def server_state_changed(self, state, error=None):
232
 
        """Derived from the Avahi example code"""
233
 
        logger.debug("Avahi server state change: %i", state)
234
 
        bad_states = { avahi.SERVER_INVALID:
235
 
                           "Zeroconf server invalid",
236
 
                       avahi.SERVER_REGISTERING: None,
237
 
                       avahi.SERVER_COLLISION:
238
 
                           "Zeroconf server name collision",
239
 
                       avahi.SERVER_FAILURE:
240
 
                           "Zeroconf server failure" }
241
 
        if state in bad_states:
242
 
            if bad_states[state] is not None:
243
 
                if error is None:
244
 
                    logger.error(bad_states[state])
245
 
                else:
246
 
                    logger.error(bad_states[state] + ": %r", error)
247
 
            self.cleanup()
248
 
        elif state == avahi.SERVER_RUNNING:
249
 
            self.add()
250
 
        else:
251
 
            if error is None:
252
 
                logger.debug("Unknown state: %r", state)
253
 
            else:
254
 
                logger.debug("Unknown state: %r: %r", state, error)
255
 
    def activate(self):
256
 
        """Derived from the Avahi example code"""
257
 
        if self.server is None:
258
 
            self.server = dbus.Interface(
259
 
                self.bus.get_object(avahi.DBUS_NAME,
260
 
                                    avahi.DBUS_PATH_SERVER,
261
 
                                    follow_name_owner_changes=True),
262
 
                avahi.DBUS_INTERFACE_SERVER)
263
 
        self.server.connect_to_signal("StateChanged",
264
 
                                 self.server_state_changed)
265
 
        self.server_state_changed(self.server.GetState())
266
 
 
267
 
 
268
 
def _timedelta_to_milliseconds(td):
269
 
    "Convert a datetime.timedelta() to milliseconds"
270
 
    return ((td.days * 24 * 60 * 60 * 1000)
271
 
            + (td.seconds * 1000)
272
 
            + (td.microseconds // 1000))
273
 
        
 
142
        global group
 
143
        if group is None:
 
144
            group = dbus.Interface\
 
145
                    (bus.get_object(avahi.DBUS_NAME,
 
146
                                    server.EntryGroupNew()),
 
147
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
148
            group.connect_to_signal('StateChanged',
 
149
                                    entry_group_state_changed)
 
150
        logger.debug(u"Adding service '%s' of type '%s' ...",
 
151
                     service.name, service.type)
 
152
        group.AddService(
 
153
                self.interface,         # interface
 
154
                avahi.PROTO_INET6,      # protocol
 
155
                dbus.UInt32(0),         # flags
 
156
                self.name, self.type,
 
157
                self.domain, self.host,
 
158
                dbus.UInt16(self.port),
 
159
                avahi.string_array_to_txt_array(self.TXT))
 
160
        group.Commit()
 
161
 
 
162
# From the Avahi example code:
 
163
group = None                            # our entry group
 
164
# End of Avahi example code
 
165
 
 
166
 
274
167
class Client(object):
275
168
    """A representation of a client host served by this server.
276
 
    
277
169
    Attributes:
278
 
    _approved:   bool(); 'None' if not yet approved/disapproved
279
 
    approval_delay: datetime.timedelta(); Time to wait for approval
280
 
    approval_duration: datetime.timedelta(); Duration of one approval
281
 
    checker:    subprocess.Popen(); a running checker process used
282
 
                                    to see if the client lives.
283
 
                                    'None' if no process is running.
284
 
    checker_callback_tag: a gobject event source tag, or None
285
 
    checker_command: string; External command which is run to check
286
 
                     if client lives.  %() expansions are done at
 
170
    name:      string; from the config file, used in log messages
 
171
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
172
                 uniquely identify the client
 
173
    secret:    bytestring; sent verbatim (over TLS) to client
 
174
    host:      string; available for use by the checker command
 
175
    created:   datetime.datetime(); object creation, not client host
 
176
    last_checked_ok: datetime.datetime() or None if not yet checked OK
 
177
    timeout:   datetime.timedelta(); How long from last_checked_ok
 
178
                                     until this client is invalid
 
179
    interval:  datetime.timedelta(); How often to start a new checker
 
180
    stop_hook: If set, called by stop() as stop_hook(self)
 
181
    checker:   subprocess.Popen(); a running checker process used
 
182
                                   to see if the client lives.
 
183
                                   'None' if no process is running.
 
184
    checker_initiator_tag: a gobject event source tag, or None
 
185
    stop_initiator_tag:    - '' -
 
186
    checker_callback_tag:  - '' -
 
187
    checker_command: string; External command which is run to check if
 
188
                     client lives.  %() expansions are done at
287
189
                     runtime with vars(self) as dict, so that for
288
190
                     instance %(name)s can be used in the command.
289
 
    checker_initiator_tag: a gobject event source tag, or None
290
 
    created:    datetime.datetime(); (UTC) object creation
291
 
    current_checker_command: string; current running checker_command
292
 
    disable_hook:  If set, called by disable() as disable_hook(self)
293
 
    disable_initiator_tag: a gobject event source tag, or None
294
 
    enabled:    bool()
295
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
296
 
                 uniquely identify the client
297
 
    host:       string; available for use by the checker command
298
 
    interval:   datetime.timedelta(); How often to start a new checker
299
 
    last_approval_request: datetime.datetime(); (UTC) or None
300
 
    last_checked_ok: datetime.datetime(); (UTC) or None
301
 
    last_enabled: datetime.datetime(); (UTC)
302
 
    name:       string; from the config file, used in log messages and
303
 
                        D-Bus identifiers
304
 
    secret:     bytestring; sent verbatim (over TLS) to client
305
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
306
 
                                      until this client is disabled
307
 
    extended_timeout:   extra long timeout when password has been sent
308
 
    runtime_expansions: Allowed attributes for runtime expansion.
309
 
    expires:    datetime.datetime(); time (UTC) when a client will be
310
 
                disabled, or None
 
191
    Private attibutes:
 
192
    _timeout: Real variable for 'timeout'
 
193
    _interval: Real variable for 'interval'
 
194
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
195
    _interval_milliseconds: - '' -
311
196
    """
312
 
    
313
 
    runtime_expansions = ("approval_delay", "approval_duration",
314
 
                          "created", "enabled", "fingerprint",
315
 
                          "host", "interval", "last_checked_ok",
316
 
                          "last_enabled", "name", "timeout")
317
 
    
318
 
    def timeout_milliseconds(self):
319
 
        "Return the 'timeout' attribute in milliseconds"
320
 
        return _timedelta_to_milliseconds(self.timeout)
321
 
    
322
 
    def extended_timeout_milliseconds(self):
323
 
        "Return the 'extended_timeout' attribute in milliseconds"
324
 
        return _timedelta_to_milliseconds(self.extended_timeout)    
325
 
    
326
 
    def interval_milliseconds(self):
327
 
        "Return the 'interval' attribute in milliseconds"
328
 
        return _timedelta_to_milliseconds(self.interval)
329
 
    
330
 
    def approval_delay_milliseconds(self):
331
 
        return _timedelta_to_milliseconds(self.approval_delay)
332
 
    
333
 
    def __init__(self, name = None, disable_hook=None, config=None):
 
197
    def _set_timeout(self, timeout):
 
198
        "Setter function for 'timeout' attribute"
 
199
        self._timeout = timeout
 
200
        self._timeout_milliseconds = ((self.timeout.days
 
201
                                       * 24 * 60 * 60 * 1000)
 
202
                                      + (self.timeout.seconds * 1000)
 
203
                                      + (self.timeout.microseconds
 
204
                                         // 1000))
 
205
    timeout = property(lambda self: self._timeout,
 
206
                       _set_timeout)
 
207
    del _set_timeout
 
208
    def _set_interval(self, interval):
 
209
        "Setter function for 'interval' attribute"
 
210
        self._interval = interval
 
211
        self._interval_milliseconds = ((self.interval.days
 
212
                                        * 24 * 60 * 60 * 1000)
 
213
                                       + (self.interval.seconds
 
214
                                          * 1000)
 
215
                                       + (self.interval.microseconds
 
216
                                          // 1000))
 
217
    interval = property(lambda self: self._interval,
 
218
                        _set_interval)
 
219
    del _set_interval
 
220
    def __init__(self, name = None, stop_hook=None, config={}):
334
221
        """Note: the 'checker' key in 'config' sets the
335
222
        'checker_command' attribute and *not* the 'checker'
336
223
        attribute."""
337
224
        self.name = name
338
 
        if config is None:
339
 
            config = {}
340
 
        logger.debug("Creating client %r", self.name)
 
225
        logger.debug(u"Creating client %r", self.name)
341
226
        # Uppercase and remove spaces from fingerprint for later
342
227
        # comparison purposes with return value from the fingerprint()
343
228
        # function
344
 
        self.fingerprint = (config["fingerprint"].upper()
345
 
                            .replace(" ", ""))
346
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
 
229
        self.fingerprint = config["fingerprint"].upper()\
 
230
                           .replace(u" ", u"")
 
231
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
347
232
        if "secret" in config:
348
 
            self.secret = config["secret"].decode("base64")
 
233
            self.secret = config["secret"].decode(u"base64")
349
234
        elif "secfile" in config:
350
 
            with open(os.path.expanduser(os.path.expandvars
351
 
                                         (config["secfile"])),
352
 
                      "rb") as secfile:
353
 
                self.secret = secfile.read()
 
235
            sf = open(config["secfile"])
 
236
            self.secret = sf.read()
 
237
            sf.close()
354
238
        else:
355
 
            raise TypeError("No secret or secfile for client %s"
 
239
            raise TypeError(u"No secret or secfile for client %s"
356
240
                            % self.name)
357
241
        self.host = config.get("host", "")
358
 
        self.created = datetime.datetime.utcnow()
359
 
        self.enabled = False
360
 
        self.last_approval_request = None
361
 
        self.last_enabled = None
 
242
        self.created = datetime.datetime.now()
362
243
        self.last_checked_ok = None
363
244
        self.timeout = string_to_delta(config["timeout"])
364
 
        self.extended_timeout = string_to_delta(config["extended_timeout"])
365
245
        self.interval = string_to_delta(config["interval"])
366
 
        self.disable_hook = disable_hook
 
246
        self.stop_hook = stop_hook
367
247
        self.checker = None
368
248
        self.checker_initiator_tag = None
369
 
        self.disable_initiator_tag = None
370
 
        self.expires = None
 
249
        self.stop_initiator_tag = None
371
250
        self.checker_callback_tag = None
372
 
        self.checker_command = config["checker"]
373
 
        self.current_checker_command = None
374
 
        self.last_connect = None
375
 
        self._approved = None
376
 
        self.approved_by_default = config.get("approved_by_default",
377
 
                                              True)
378
 
        self.approvals_pending = 0
379
 
        self.approval_delay = string_to_delta(
380
 
            config["approval_delay"])
381
 
        self.approval_duration = string_to_delta(
382
 
            config["approval_duration"])
383
 
        self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
384
 
    
385
 
    def send_changedstate(self):
386
 
        self.changedstate.acquire()
387
 
        self.changedstate.notify_all()
388
 
        self.changedstate.release()
389
 
        
390
 
    def enable(self):
 
251
        self.check_command = config["checker"]
 
252
    def start(self):
391
253
        """Start this client's checker and timeout hooks"""
392
 
        if getattr(self, "enabled", False):
393
 
            # Already enabled
394
 
            return
395
 
        self.send_changedstate()
396
254
        # Schedule a new checker to be started an 'interval' from now,
397
255
        # and every interval from then on.
398
 
        self.checker_initiator_tag = (gobject.timeout_add
399
 
                                      (self.interval_milliseconds(),
400
 
                                       self.start_checker))
401
 
        # Schedule a disable() when 'timeout' has passed
402
 
        self.expires = datetime.datetime.utcnow() + self.timeout
403
 
        self.disable_initiator_tag = (gobject.timeout_add
404
 
                                   (self.timeout_milliseconds(),
405
 
                                    self.disable))
406
 
        self.enabled = True
407
 
        self.last_enabled = datetime.datetime.utcnow()
 
256
        self.checker_initiator_tag = gobject.timeout_add\
 
257
                                     (self._interval_milliseconds,
 
258
                                      self.start_checker)
408
259
        # Also start a new checker *right now*.
409
260
        self.start_checker()
410
 
    
411
 
    def disable(self, quiet=True):
412
 
        """Disable this client."""
413
 
        if not getattr(self, "enabled", False):
 
261
        # Schedule a stop() when 'timeout' has passed
 
262
        self.stop_initiator_tag = gobject.timeout_add\
 
263
                                  (self._timeout_milliseconds,
 
264
                                   self.stop)
 
265
    def stop(self):
 
266
        """Stop this client.
 
267
        The possibility that a client might be restarted is left open,
 
268
        but not currently used."""
 
269
        # If this client doesn't have a secret, it is already stopped.
 
270
        if hasattr(self, "secret") and self.secret:
 
271
            logger.info(u"Stopping client %s", self.name)
 
272
            self.secret = None
 
273
        else:
414
274
            return False
415
 
        if not quiet:
416
 
            self.send_changedstate()
417
 
        if not quiet:
418
 
            logger.info("Disabling client %s", self.name)
419
 
        if getattr(self, "disable_initiator_tag", False):
420
 
            gobject.source_remove(self.disable_initiator_tag)
421
 
            self.disable_initiator_tag = None
422
 
        self.expires = None
 
275
        if getattr(self, "stop_initiator_tag", False):
 
276
            gobject.source_remove(self.stop_initiator_tag)
 
277
            self.stop_initiator_tag = None
423
278
        if getattr(self, "checker_initiator_tag", False):
424
279
            gobject.source_remove(self.checker_initiator_tag)
425
280
            self.checker_initiator_tag = None
426
281
        self.stop_checker()
427
 
        if self.disable_hook:
428
 
            self.disable_hook(self)
429
 
        self.enabled = False
 
282
        if self.stop_hook:
 
283
            self.stop_hook(self)
430
284
        # Do not run this again if called by a gobject.timeout_add
431
285
        return False
432
 
    
433
286
    def __del__(self):
434
 
        self.disable_hook = None
435
 
        self.disable()
436
 
    
437
 
    def checker_callback(self, pid, condition, command):
 
287
        self.stop_hook = None
 
288
        self.stop()
 
289
    def checker_callback(self, pid, condition):
438
290
        """The checker has completed, so take appropriate actions."""
 
291
        now = datetime.datetime.now()
439
292
        self.checker_callback_tag = None
440
293
        self.checker = None
441
 
        if os.WIFEXITED(condition):
442
 
            exitstatus = os.WEXITSTATUS(condition)
443
 
            if exitstatus == 0:
444
 
                logger.info("Checker for %(name)s succeeded",
445
 
                            vars(self))
446
 
                self.checked_ok()
447
 
            else:
448
 
                logger.info("Checker for %(name)s failed",
449
 
                            vars(self))
450
 
        else:
451
 
            logger.warning("Checker for %(name)s crashed?",
 
294
        if os.WIFEXITED(condition) \
 
295
               and (os.WEXITSTATUS(condition) == 0):
 
296
            logger.info(u"Checker for %(name)s succeeded",
 
297
                        vars(self))
 
298
            self.last_checked_ok = now
 
299
            gobject.source_remove(self.stop_initiator_tag)
 
300
            self.stop_initiator_tag = gobject.timeout_add\
 
301
                                      (self._timeout_milliseconds,
 
302
                                       self.stop)
 
303
        elif not os.WIFEXITED(condition):
 
304
            logger.warning(u"Checker for %(name)s crashed?",
452
305
                           vars(self))
453
 
    
454
 
    def checked_ok(self, timeout=None):
455
 
        """Bump up the timeout for this client.
456
 
        
457
 
        This should only be called when the client has been seen,
458
 
        alive and well.
459
 
        """
460
 
        if timeout is None:
461
 
            timeout = self.timeout
462
 
        self.last_checked_ok = datetime.datetime.utcnow()
463
 
        gobject.source_remove(self.disable_initiator_tag)
464
 
        self.expires = datetime.datetime.utcnow() + timeout
465
 
        self.disable_initiator_tag = (gobject.timeout_add
466
 
                                      (_timedelta_to_milliseconds(timeout),
467
 
                                       self.disable))
468
 
    
469
 
    def need_approval(self):
470
 
        self.last_approval_request = datetime.datetime.utcnow()
471
 
    
 
306
        else:
 
307
            logger.info(u"Checker for %(name)s failed",
 
308
                        vars(self))
472
309
    def start_checker(self):
473
310
        """Start a new checker subprocess if one is not running.
474
 
        
475
311
        If a checker already exists, leave it running and do
476
312
        nothing."""
477
313
        # The reason for not killing a running checker is that if we
480
316
        # client would inevitably timeout, since no checker would get
481
317
        # a chance to run to completion.  If we instead leave running
482
318
        # checkers alone, the checker would have to take more time
483
 
        # than 'timeout' for the client to be disabled, which is as it
484
 
        # should be.
485
 
        
486
 
        # If a checker exists, make sure it is not a zombie
487
 
        try:
488
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
489
 
        except (AttributeError, OSError) as error:
490
 
            if (isinstance(error, OSError)
491
 
                and error.errno != errno.ECHILD):
492
 
                raise error
493
 
        else:
494
 
            if pid:
495
 
                logger.warning("Checker was a zombie")
496
 
                gobject.source_remove(self.checker_callback_tag)
497
 
                self.checker_callback(pid, status,
498
 
                                      self.current_checker_command)
499
 
        # Start a new checker if needed
 
319
        # than 'timeout' for the client to be declared invalid, which
 
320
        # is as it should be.
500
321
        if self.checker is None:
501
322
            try:
502
 
                # In case checker_command has exactly one % operator
503
 
                command = self.checker_command % self.host
 
323
                # In case check_command has exactly one % operator
 
324
                command = self.check_command % self.host
504
325
            except TypeError:
505
326
                # Escape attributes for the shell
506
 
                escaped_attrs = dict(
507
 
                    (attr,
508
 
                     re.escape(unicode(str(getattr(self, attr, "")),
509
 
                                       errors=
510
 
                                       'replace')))
511
 
                    for attr in
512
 
                    self.runtime_expansions)
513
 
                
 
327
                escaped_attrs = dict((key, re.escape(str(val)))
 
328
                                     for key, val in
 
329
                                     vars(self).iteritems())
514
330
                try:
515
 
                    command = self.checker_command % escaped_attrs
516
 
                except TypeError as error:
517
 
                    logger.error('Could not format string "%s":'
518
 
                                 ' %s', self.checker_command, error)
 
331
                    command = self.check_command % escaped_attrs
 
332
                except TypeError, error:
 
333
                    logger.error(u'Could not format string "%s":'
 
334
                                 u' %s', self.check_command, error)
519
335
                    return True # Try again later
520
 
            self.current_checker_command = command
521
336
            try:
522
 
                logger.info("Starting checker %r for %s",
 
337
                logger.info(u"Starting checker %r for %s",
523
338
                            command, self.name)
524
 
                # We don't need to redirect stdout and stderr, since
525
 
                # in normal mode, that is already done by daemon(),
526
 
                # and in debug mode we don't want to.  (Stdin is
527
 
                # always replaced by /dev/null.)
528
339
                self.checker = subprocess.Popen(command,
529
340
                                                close_fds=True,
530
341
                                                shell=True, cwd="/")
531
 
                self.checker_callback_tag = (gobject.child_watch_add
532
 
                                             (self.checker.pid,
533
 
                                              self.checker_callback,
534
 
                                              data=command))
535
 
                # The checker may have completed before the gobject
536
 
                # watch was added.  Check for this.
537
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
538
 
                if pid:
539
 
                    gobject.source_remove(self.checker_callback_tag)
540
 
                    self.checker_callback(pid, status, command)
541
 
            except OSError as error:
542
 
                logger.error("Failed to start subprocess: %s",
 
342
                self.checker_callback_tag = gobject.child_watch_add\
 
343
                                            (self.checker.pid,
 
344
                                             self.checker_callback)
 
345
            except subprocess.OSError, error:
 
346
                logger.error(u"Failed to start subprocess: %s",
543
347
                             error)
544
348
        # Re-run this periodically if run by gobject.timeout_add
545
349
        return True
546
 
    
547
350
    def stop_checker(self):
548
351
        """Force the checker process, if any, to stop."""
549
352
        if self.checker_callback_tag:
551
354
            self.checker_callback_tag = None
552
355
        if getattr(self, "checker", None) is None:
553
356
            return
554
 
        logger.debug("Stopping checker for %(name)s", vars(self))
 
357
        logger.debug(u"Stopping checker for %(name)s", vars(self))
555
358
        try:
556
359
            os.kill(self.checker.pid, signal.SIGTERM)
557
 
            #time.sleep(0.5)
 
360
            #os.sleep(0.5)
558
361
            #if self.checker.poll() is None:
559
362
            #    os.kill(self.checker.pid, signal.SIGKILL)
560
 
        except OSError as error:
 
363
        except OSError, error:
561
364
            if error.errno != errno.ESRCH: # No such process
562
365
                raise
563
366
        self.checker = None
564
 
 
565
 
 
566
 
def dbus_service_property(dbus_interface, signature="v",
567
 
                          access="readwrite", byte_arrays=False):
568
 
    """Decorators for marking methods of a DBusObjectWithProperties to
569
 
    become properties on the D-Bus.
570
 
    
571
 
    The decorated method will be called with no arguments by "Get"
572
 
    and with one argument by "Set".
573
 
    
574
 
    The parameters, where they are supported, are the same as
575
 
    dbus.service.method, except there is only "signature", since the
576
 
    type from Get() and the type sent to Set() is the same.
577
 
    """
578
 
    # Encoding deeply encoded byte arrays is not supported yet by the
579
 
    # "Set" method, so we fail early here:
580
 
    if byte_arrays and signature != "ay":
581
 
        raise ValueError("Byte arrays not supported for non-'ay'"
582
 
                         " signature %r" % signature)
583
 
    def decorator(func):
584
 
        func._dbus_is_property = True
585
 
        func._dbus_interface = dbus_interface
586
 
        func._dbus_signature = signature
587
 
        func._dbus_access = access
588
 
        func._dbus_name = func.__name__
589
 
        if func._dbus_name.endswith("_dbus_property"):
590
 
            func._dbus_name = func._dbus_name[:-14]
591
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
592
 
        return func
593
 
    return decorator
594
 
 
595
 
 
596
 
class DBusPropertyException(dbus.exceptions.DBusException):
597
 
    """A base class for D-Bus property-related exceptions
598
 
    """
599
 
    def __unicode__(self):
600
 
        return unicode(str(self))
601
 
 
602
 
 
603
 
class DBusPropertyAccessException(DBusPropertyException):
604
 
    """A property's access permissions disallows an operation.
605
 
    """
606
 
    pass
607
 
 
608
 
 
609
 
class DBusPropertyNotFound(DBusPropertyException):
610
 
    """An attempt was made to access a non-existing property.
611
 
    """
612
 
    pass
613
 
 
614
 
 
615
 
class DBusObjectWithProperties(dbus.service.Object):
616
 
    """A D-Bus object with properties.
617
 
    
618
 
    Classes inheriting from this can use the dbus_service_property
619
 
    decorator to expose methods as D-Bus properties.  It exposes the
620
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
621
 
    """
622
 
    
623
 
    @staticmethod
624
 
    def _is_dbus_property(obj):
625
 
        return getattr(obj, "_dbus_is_property", False)
626
 
    
627
 
    def _get_all_dbus_properties(self):
628
 
        """Returns a generator of (name, attribute) pairs
629
 
        """
630
 
        return ((prop.__get__(self)._dbus_name, prop.__get__(self))
631
 
                for cls in self.__class__.__mro__
632
 
                for name, prop in inspect.getmembers(cls, self._is_dbus_property))
633
 
    
634
 
    def _get_dbus_property(self, interface_name, property_name):
635
 
        """Returns a bound method if one exists which is a D-Bus
636
 
        property with the specified name and interface.
637
 
        """
638
 
        for cls in  self.__class__.__mro__:
639
 
            for name, value in inspect.getmembers(cls, self._is_dbus_property):
640
 
                if value._dbus_name == property_name and value._dbus_interface == interface_name:
641
 
                    return value.__get__(self)
642
 
        
643
 
        # No such property
644
 
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
645
 
                                   + interface_name + "."
646
 
                                   + property_name)
647
 
 
648
 
    
649
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
650
 
                         out_signature="v")
651
 
    def Get(self, interface_name, property_name):
652
 
        """Standard D-Bus property Get() method, see D-Bus standard.
653
 
        """
654
 
        prop = self._get_dbus_property(interface_name, property_name)
655
 
        if prop._dbus_access == "write":
656
 
            raise DBusPropertyAccessException(property_name)
657
 
        value = prop()
658
 
        if not hasattr(value, "variant_level"):
659
 
            return value
660
 
        return type(value)(value, variant_level=value.variant_level+1)
661
 
    
662
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
663
 
    def Set(self, interface_name, property_name, value):
664
 
        """Standard D-Bus property Set() method, see D-Bus standard.
665
 
        """
666
 
        prop = self._get_dbus_property(interface_name, property_name)
667
 
        if prop._dbus_access == "read":
668
 
            raise DBusPropertyAccessException(property_name)
669
 
        if prop._dbus_get_args_options["byte_arrays"]:
670
 
            # The byte_arrays option is not supported yet on
671
 
            # signatures other than "ay".
672
 
            if prop._dbus_signature != "ay":
673
 
                raise ValueError
674
 
            value = dbus.ByteArray(''.join(unichr(byte)
675
 
                                           for byte in value))
676
 
        prop(value)
677
 
    
678
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
679
 
                         out_signature="a{sv}")
680
 
    def GetAll(self, interface_name):
681
 
        """Standard D-Bus property GetAll() method, see D-Bus
682
 
        standard.
683
 
        
684
 
        Note: Will not include properties with access="write".
685
 
        """
686
 
        all = {}
687
 
        for name, prop in self._get_all_dbus_properties():
688
 
            if (interface_name
689
 
                and interface_name != prop._dbus_interface):
690
 
                # Interface non-empty but did not match
691
 
                continue
692
 
            # Ignore write-only properties
693
 
            if prop._dbus_access == "write":
694
 
                continue
695
 
            value = prop()
696
 
            if not hasattr(value, "variant_level"):
697
 
                all[name] = value
698
 
                continue
699
 
            all[name] = type(value)(value, variant_level=
700
 
                                    value.variant_level+1)
701
 
        return dbus.Dictionary(all, signature="sv")
702
 
    
703
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
704
 
                         out_signature="s",
705
 
                         path_keyword='object_path',
706
 
                         connection_keyword='connection')
707
 
    def Introspect(self, object_path, connection):
708
 
        """Standard D-Bus method, overloaded to insert property tags.
709
 
        """
710
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
711
 
                                                   connection)
712
 
        try:
713
 
            document = xml.dom.minidom.parseString(xmlstring)
714
 
            def make_tag(document, name, prop):
715
 
                e = document.createElement("property")
716
 
                e.setAttribute("name", name)
717
 
                e.setAttribute("type", prop._dbus_signature)
718
 
                e.setAttribute("access", prop._dbus_access)
719
 
                return e
720
 
            for if_tag in document.getElementsByTagName("interface"):
721
 
                for tag in (make_tag(document, name, prop)
722
 
                            for name, prop
723
 
                            in self._get_all_dbus_properties()
724
 
                            if prop._dbus_interface
725
 
                            == if_tag.getAttribute("name")):
726
 
                    if_tag.appendChild(tag)
727
 
                # Add the names to the return values for the
728
 
                # "org.freedesktop.DBus.Properties" methods
729
 
                if (if_tag.getAttribute("name")
730
 
                    == "org.freedesktop.DBus.Properties"):
731
 
                    for cn in if_tag.getElementsByTagName("method"):
732
 
                        if cn.getAttribute("name") == "Get":
733
 
                            for arg in cn.getElementsByTagName("arg"):
734
 
                                if (arg.getAttribute("direction")
735
 
                                    == "out"):
736
 
                                    arg.setAttribute("name", "value")
737
 
                        elif cn.getAttribute("name") == "GetAll":
738
 
                            for arg in cn.getElementsByTagName("arg"):
739
 
                                if (arg.getAttribute("direction")
740
 
                                    == "out"):
741
 
                                    arg.setAttribute("name", "props")
742
 
            xmlstring = document.toxml("utf-8")
743
 
            document.unlink()
744
 
        except (AttributeError, xml.dom.DOMException,
745
 
                xml.parsers.expat.ExpatError) as error:
746
 
            logger.error("Failed to override Introspection method",
747
 
                         error)
748
 
        return xmlstring
749
 
 
750
 
 
751
 
def datetime_to_dbus (dt, variant_level=0):
752
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
753
 
    if dt is None:
754
 
        return dbus.String("", variant_level = variant_level)
755
 
    return dbus.String(dt.isoformat(),
756
 
                       variant_level=variant_level)
757
 
 
758
 
class transitional_dbus_metaclass(DBusObjectWithProperties.__metaclass__):
759
 
    def __new__(mcs, name, bases, attr):
760
 
        for attrname, old_dbusobj in inspect.getmembers(bases[0]):
761
 
            new_interface = getattr(old_dbusobj, "_dbus_interface", "").replace("se.bsnet.fukt.", "se.recompile.")
762
 
            if (getattr(old_dbusobj, "_dbus_is_signal", False)
763
 
                and old_dbusobj._dbus_interface.startswith("se.bsnet.fukt.Mandos")):
764
 
                unwrappedfunc = dict(zip(old_dbusobj.func_code.co_freevars,
765
 
                                    old_dbusobj.__closure__))["func"].cell_contents
766
 
                newfunc = types.FunctionType(unwrappedfunc.func_code,
767
 
                                             unwrappedfunc.func_globals,
768
 
                                             unwrappedfunc.func_name,
769
 
                                             unwrappedfunc.func_defaults,
770
 
                                             unwrappedfunc.func_closure)
771
 
                new_dbusfunc = dbus.service.signal(
772
 
                    new_interface, old_dbusobj._dbus_signature)(newfunc)            
773
 
                attr["_transitional_" + attrname] = new_dbusfunc
774
 
 
775
 
                def fixscope(func1, func2):
776
 
                    def newcall(*args, **kwargs):
777
 
                        func1(*args, **kwargs)
778
 
                        func2(*args, **kwargs)
779
 
                    return newcall
780
 
 
781
 
                attr[attrname] = fixscope(old_dbusobj, new_dbusfunc)
782
 
            
783
 
            elif (getattr(old_dbusobj, "_dbus_is_method", False)
784
 
                and old_dbusobj._dbus_interface.startswith("se.bsnet.fukt.Mandos")):
785
 
                new_dbusfunc = (dbus.service.method
786
 
                                (new_interface,
787
 
                                 old_dbusobj._dbus_in_signature,
788
 
                                 old_dbusobj._dbus_out_signature)
789
 
                                (types.FunctionType
790
 
                                 (old_dbusobj.func_code,
791
 
                                  old_dbusobj.func_globals,
792
 
                                  old_dbusobj.func_name,
793
 
                                  old_dbusobj.func_defaults,
794
 
                                  old_dbusobj.func_closure)))
795
 
 
796
 
                attr[attrname] = new_dbusfunc
797
 
            elif (getattr(old_dbusobj, "_dbus_is_property", False)
798
 
                  and old_dbusobj._dbus_interface.startswith("se.bsnet.fukt.Mandos")):
799
 
                new_dbusfunc = (dbus_service_property
800
 
                                (new_interface,
801
 
                                 old_dbusobj._dbus_signature,
802
 
                                 old_dbusobj._dbus_access,
803
 
                                 old_dbusobj._dbus_get_args_options["byte_arrays"])
804
 
                                (types.FunctionType
805
 
                                 (old_dbusobj.func_code,
806
 
                                  old_dbusobj.func_globals,
807
 
                                  old_dbusobj.func_name,
808
 
                                  old_dbusobj.func_defaults,
809
 
                                  old_dbusobj.func_closure)))
810
 
 
811
 
                attr[attrname] = new_dbusfunc
812
 
        return type.__new__(mcs, name, bases, attr)
813
 
 
814
 
class ClientDBus(Client, DBusObjectWithProperties):
815
 
    """A Client class using D-Bus
816
 
    
817
 
    Attributes:
818
 
    dbus_object_path: dbus.ObjectPath
819
 
    bus: dbus.SystemBus()
820
 
    """
821
 
    
822
 
    runtime_expansions = (Client.runtime_expansions
823
 
                          + ("dbus_object_path",))
824
 
    
825
 
    # dbus.service.Object doesn't use super(), so we can't either.
826
 
    
827
 
    def __init__(self, bus = None, *args, **kwargs):
828
 
        self._approvals_pending = 0
829
 
        self.bus = bus
830
 
        Client.__init__(self, *args, **kwargs)
831
 
        # Only now, when this client is initialized, can it show up on
832
 
        # the D-Bus
833
 
        client_object_name = unicode(self.name).translate(
834
 
            {ord("."): ord("_"),
835
 
             ord("-"): ord("_")})
836
 
        self.dbus_object_path = (dbus.ObjectPath
837
 
                                 ("/clients/" + client_object_name))
838
 
        DBusObjectWithProperties.__init__(self, self.bus,
839
 
                                          self.dbus_object_path)
840
 
        
841
 
    def notifychangeproperty(transform_func,
842
 
                             dbus_name, type_func=lambda x: x,
843
 
                             variant_level=1):
844
 
        """ Modify a variable so that its a property that announce its
845
 
        changes to DBus.
846
 
        transform_fun: Function that takes a value and transform it to
847
 
                       DBus type.
848
 
        dbus_name: DBus name of the variable
849
 
        type_func: Function that transform the value before sending it
850
 
                   to DBus
851
 
        variant_level: DBus variant level. default: 1
852
 
        """
853
 
        real_value = [None,]
854
 
        def setter(self, value):
855
 
            old_value = real_value[0]
856
 
            real_value[0] = value
857
 
            if hasattr(self, "dbus_object_path"):
858
 
                if type_func(old_value) != type_func(real_value[0]):
859
 
                    dbus_value = transform_func(type_func(real_value[0]),
860
 
                                                variant_level)
861
 
                    self.PropertyChanged(dbus.String(dbus_name),
862
 
                                         dbus_value)
863
 
        
864
 
        return property(lambda self: real_value[0], setter)
865
 
    
866
 
    
867
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
868
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
869
 
                                             "ApprovalPending",
870
 
                                             type_func = bool)
871
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
872
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
873
 
                                        "LastEnabled")
874
 
    checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
875
 
                                   type_func = lambda checker: checker is not None)
876
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
877
 
                                           "LastCheckedOK")
878
 
    last_approval_request = notifychangeproperty(datetime_to_dbus,
879
 
                                                 "LastApprovalRequest")
880
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
881
 
                                               "ApprovedByDefault")
882
 
    approval_delay = notifychangeproperty(dbus.UInt16, "ApprovalDelay",
883
 
                                          type_func = _timedelta_to_milliseconds)
884
 
    approval_duration = notifychangeproperty(dbus.UInt16, "ApprovalDuration",
885
 
                                             type_func = _timedelta_to_milliseconds)
886
 
    host = notifychangeproperty(dbus.String, "Host")
887
 
    timeout = notifychangeproperty(dbus.UInt16, "Timeout",
888
 
                                   type_func = _timedelta_to_milliseconds)
889
 
    extended_timeout = notifychangeproperty(dbus.UInt16, "ExtendedTimeout",
890
 
                                            type_func = _timedelta_to_milliseconds)
891
 
    interval = notifychangeproperty(dbus.UInt16, "Interval",
892
 
                                    type_func = _timedelta_to_milliseconds)
893
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
894
 
    
895
 
    del notifychangeproperty
896
 
    
897
 
    def __del__(self, *args, **kwargs):
898
 
        try:
899
 
            self.remove_from_connection()
900
 
        except LookupError:
901
 
            pass
902
 
        if hasattr(DBusObjectWithProperties, "__del__"):
903
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
904
 
        Client.__del__(self, *args, **kwargs)
905
 
    
906
 
    def checker_callback(self, pid, condition, command,
907
 
                         *args, **kwargs):
908
 
        self.checker_callback_tag = None
909
 
        self.checker = None
910
 
        if os.WIFEXITED(condition):
911
 
            exitstatus = os.WEXITSTATUS(condition)
912
 
            # Emit D-Bus signal
913
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
914
 
                                  dbus.Int64(condition),
915
 
                                  dbus.String(command))
916
 
        else:
917
 
            # Emit D-Bus signal
918
 
            self.CheckerCompleted(dbus.Int16(-1),
919
 
                                  dbus.Int64(condition),
920
 
                                  dbus.String(command))
921
 
        
922
 
        return Client.checker_callback(self, pid, condition, command,
923
 
                                       *args, **kwargs)
924
 
    
925
 
    def start_checker(self, *args, **kwargs):
926
 
        old_checker = self.checker
927
 
        if self.checker is not None:
928
 
            old_checker_pid = self.checker.pid
929
 
        else:
930
 
            old_checker_pid = None
931
 
        r = Client.start_checker(self, *args, **kwargs)
932
 
        # Only if new checker process was started
933
 
        if (self.checker is not None
934
 
            and old_checker_pid != self.checker.pid):
935
 
            # Emit D-Bus signal
936
 
            self.CheckerStarted(self.current_checker_command)
937
 
        return r
938
 
    
939
 
    def _reset_approved(self):
940
 
        self._approved = None
941
 
        return False
942
 
    
943
 
    def approve(self, value=True):
944
 
        self.send_changedstate()
945
 
        self._approved = value
946
 
        gobject.timeout_add(_timedelta_to_milliseconds
947
 
                            (self.approval_duration),
948
 
                            self._reset_approved)
949
 
    
950
 
    
951
 
    ## D-Bus methods, signals & properties
952
 
    _interface = "se.bsnet.fukt.Mandos.Client"
953
 
 
954
 
    ## Signals
955
 
    
956
 
    # CheckerCompleted - signal
957
 
    @dbus.service.signal(_interface, signature="nxs")
958
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
959
 
        "D-Bus signal"
960
 
        pass
961
 
    
962
 
    # CheckerStarted - signal
963
 
    @dbus.service.signal(_interface, signature="s")
964
 
    def CheckerStarted(self, command):
965
 
        "D-Bus signal"
966
 
        pass
967
 
    
968
 
    # PropertyChanged - signal
969
 
    @dbus.service.signal(_interface, signature="sv")
970
 
    def PropertyChanged(self, property, value):
971
 
        "D-Bus signal"
972
 
        pass
973
 
    
974
 
    # GotSecret - signal
975
 
    @dbus.service.signal(_interface)
976
 
    def GotSecret(self):
977
 
        """D-Bus signal
978
 
        Is sent after a successful transfer of secret from the Mandos
979
 
        server to mandos-client
980
 
        """
981
 
        pass
982
 
    
983
 
    # Rejected - signal
984
 
    @dbus.service.signal(_interface, signature="s")
985
 
    def Rejected(self, reason):
986
 
        "D-Bus signal"
987
 
        pass
988
 
    
989
 
    # NeedApproval - signal
990
 
    @dbus.service.signal(_interface, signature="tb")
991
 
    def NeedApproval(self, timeout, default):
992
 
        "D-Bus signal"
993
 
        return self.need_approval()
994
 
    
995
 
    ## Methods
996
 
    
997
 
    # Approve - method
998
 
    @dbus.service.method(_interface, in_signature="b")
999
 
    def Approve(self, value):
1000
 
        self.approve(value)
1001
 
    
1002
 
    # CheckedOK - method
1003
 
    @dbus.service.method(_interface)
1004
 
    def CheckedOK(self):
1005
 
        self.checked_ok()
1006
 
    
1007
 
    # Enable - method
1008
 
    @dbus.service.method(_interface)
1009
 
    def Enable(self):
1010
 
        "D-Bus method"
1011
 
        self.enable()
1012
 
    
1013
 
    # StartChecker - method
1014
 
    @dbus.service.method(_interface)
1015
 
    def StartChecker(self):
1016
 
        "D-Bus method"
1017
 
        self.start_checker()
1018
 
    
1019
 
    # Disable - method
1020
 
    @dbus.service.method(_interface)
1021
 
    def Disable(self):
1022
 
        "D-Bus method"
1023
 
        self.disable()
1024
 
    
1025
 
    # StopChecker - method
1026
 
    @dbus.service.method(_interface)
1027
 
    def StopChecker(self):
1028
 
        self.stop_checker()
1029
 
    
1030
 
    ## Properties
1031
 
    
1032
 
    # ApprovalPending - property
1033
 
    @dbus_service_property(_interface, signature="b", access="read")
1034
 
    def ApprovalPending_dbus_property(self):
1035
 
        return dbus.Boolean(bool(self.approvals_pending))
1036
 
    
1037
 
    # ApprovedByDefault - property
1038
 
    @dbus_service_property(_interface, signature="b",
1039
 
                           access="readwrite")
1040
 
    def ApprovedByDefault_dbus_property(self, value=None):
1041
 
        if value is None:       # get
1042
 
            return dbus.Boolean(self.approved_by_default)
1043
 
        self.approved_by_default = bool(value)
1044
 
    
1045
 
    # ApprovalDelay - property
1046
 
    @dbus_service_property(_interface, signature="t",
1047
 
                           access="readwrite")
1048
 
    def ApprovalDelay_dbus_property(self, value=None):
1049
 
        if value is None:       # get
1050
 
            return dbus.UInt64(self.approval_delay_milliseconds())
1051
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
1052
 
    
1053
 
    # ApprovalDuration - property
1054
 
    @dbus_service_property(_interface, signature="t",
1055
 
                           access="readwrite")
1056
 
    def ApprovalDuration_dbus_property(self, value=None):
1057
 
        if value is None:       # get
1058
 
            return dbus.UInt64(_timedelta_to_milliseconds(
1059
 
                    self.approval_duration))
1060
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
1061
 
    
1062
 
    # Name - property
1063
 
    @dbus_service_property(_interface, signature="s", access="read")
1064
 
    def Name_dbus_property(self):
1065
 
        return dbus.String(self.name)
1066
 
    
1067
 
    # Fingerprint - property
1068
 
    @dbus_service_property(_interface, signature="s", access="read")
1069
 
    def Fingerprint_dbus_property(self):
1070
 
        return dbus.String(self.fingerprint)
1071
 
    
1072
 
    # Host - property
1073
 
    @dbus_service_property(_interface, signature="s",
1074
 
                           access="readwrite")
1075
 
    def Host_dbus_property(self, value=None):
1076
 
        if value is None:       # get
1077
 
            return dbus.String(self.host)
1078
 
        self.host = value
1079
 
    
1080
 
    # Created - property
1081
 
    @dbus_service_property(_interface, signature="s", access="read")
1082
 
    def Created_dbus_property(self):
1083
 
        return dbus.String(datetime_to_dbus(self.created))
1084
 
    
1085
 
    # LastEnabled - property
1086
 
    @dbus_service_property(_interface, signature="s", access="read")
1087
 
    def LastEnabled_dbus_property(self):
1088
 
        return datetime_to_dbus(self.last_enabled)
1089
 
    
1090
 
    # Enabled - property
1091
 
    @dbus_service_property(_interface, signature="b",
1092
 
                           access="readwrite")
1093
 
    def Enabled_dbus_property(self, value=None):
1094
 
        if value is None:       # get
1095
 
            return dbus.Boolean(self.enabled)
1096
 
        if value:
1097
 
            self.enable()
1098
 
        else:
1099
 
            self.disable()
1100
 
    
1101
 
    # LastCheckedOK - property
1102
 
    @dbus_service_property(_interface, signature="s",
1103
 
                           access="readwrite")
1104
 
    def LastCheckedOK_dbus_property(self, value=None):
1105
 
        if value is not None:
1106
 
            self.checked_ok()
1107
 
            return
1108
 
        return datetime_to_dbus(self.last_checked_ok)
1109
 
    
1110
 
    # Expires - property
1111
 
    @dbus_service_property(_interface, signature="s", access="read")
1112
 
    def Expires_dbus_property(self):
1113
 
        return datetime_to_dbus(self.expires)
1114
 
    
1115
 
    # LastApprovalRequest - property
1116
 
    @dbus_service_property(_interface, signature="s", access="read")
1117
 
    def LastApprovalRequest_dbus_property(self):
1118
 
        return datetime_to_dbus(self.last_approval_request)
1119
 
    
1120
 
    # Timeout - property
1121
 
    @dbus_service_property(_interface, signature="t",
1122
 
                           access="readwrite")
1123
 
    def Timeout_dbus_property(self, value=None):
1124
 
        if value is None:       # get
1125
 
            return dbus.UInt64(self.timeout_milliseconds())
1126
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1127
 
        if getattr(self, "disable_initiator_tag", None) is None:
1128
 
            return
1129
 
        # Reschedule timeout
1130
 
        gobject.source_remove(self.disable_initiator_tag)
1131
 
        self.disable_initiator_tag = None
1132
 
        self.expires = None
1133
 
        time_to_die = (self.
1134
 
                       _timedelta_to_milliseconds((self
1135
 
                                                   .last_checked_ok
1136
 
                                                   + self.timeout)
1137
 
                                                  - datetime.datetime
1138
 
                                                  .utcnow()))
1139
 
        if time_to_die <= 0:
1140
 
            # The timeout has passed
1141
 
            self.disable()
1142
 
        else:
1143
 
            self.expires = (datetime.datetime.utcnow()
1144
 
                            + datetime.timedelta(milliseconds = time_to_die))
1145
 
            self.disable_initiator_tag = (gobject.timeout_add
1146
 
                                          (time_to_die, self.disable))
1147
 
    
1148
 
    # ExtendedTimeout - property
1149
 
    @dbus_service_property(_interface, signature="t",
1150
 
                           access="readwrite")
1151
 
    def ExtendedTimeout_dbus_property(self, value=None):
1152
 
        if value is None:       # get
1153
 
            return dbus.UInt64(self.extended_timeout_milliseconds())
1154
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1155
 
    
1156
 
    # Interval - property
1157
 
    @dbus_service_property(_interface, signature="t",
1158
 
                           access="readwrite")
1159
 
    def Interval_dbus_property(self, value=None):
1160
 
        if value is None:       # get
1161
 
            return dbus.UInt64(self.interval_milliseconds())
1162
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1163
 
        if getattr(self, "checker_initiator_tag", None) is None:
1164
 
            return
1165
 
        # Reschedule checker run
1166
 
        gobject.source_remove(self.checker_initiator_tag)
1167
 
        self.checker_initiator_tag = (gobject.timeout_add
1168
 
                                      (value, self.start_checker))
1169
 
        self.start_checker()    # Start one now, too
1170
 
    
1171
 
    # Checker - property
1172
 
    @dbus_service_property(_interface, signature="s",
1173
 
                           access="readwrite")
1174
 
    def Checker_dbus_property(self, value=None):
1175
 
        if value is None:       # get
1176
 
            return dbus.String(self.checker_command)
1177
 
        self.checker_command = value
1178
 
    
1179
 
    # CheckerRunning - property
1180
 
    @dbus_service_property(_interface, signature="b",
1181
 
                           access="readwrite")
1182
 
    def CheckerRunning_dbus_property(self, value=None):
1183
 
        if value is None:       # get
1184
 
            return dbus.Boolean(self.checker is not None)
1185
 
        if value:
1186
 
            self.start_checker()
1187
 
        else:
1188
 
            self.stop_checker()
1189
 
    
1190
 
    # ObjectPath - property
1191
 
    @dbus_service_property(_interface, signature="o", access="read")
1192
 
    def ObjectPath_dbus_property(self):
1193
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1194
 
    
1195
 
    # Secret = property
1196
 
    @dbus_service_property(_interface, signature="ay",
1197
 
                           access="write", byte_arrays=True)
1198
 
    def Secret_dbus_property(self, value):
1199
 
        self.secret = str(value)
1200
 
    
1201
 
    del _interface
1202
 
 
1203
 
 
1204
 
class ProxyClient(object):
1205
 
    def __init__(self, child_pipe, fpr, address):
1206
 
        self._pipe = child_pipe
1207
 
        self._pipe.send(('init', fpr, address))
1208
 
        if not self._pipe.recv():
1209
 
            raise KeyError()
1210
 
    
1211
 
    def __getattribute__(self, name):
1212
 
        if(name == '_pipe'):
1213
 
            return super(ProxyClient, self).__getattribute__(name)
1214
 
        self._pipe.send(('getattr', name))
1215
 
        data = self._pipe.recv()
1216
 
        if data[0] == 'data':
1217
 
            return data[1]
1218
 
        if data[0] == 'function':
1219
 
            def func(*args, **kwargs):
1220
 
                self._pipe.send(('funcall', name, args, kwargs))
1221
 
                return self._pipe.recv()[1]
1222
 
            return func
1223
 
    
1224
 
    def __setattr__(self, name, value):
1225
 
        if(name == '_pipe'):
1226
 
            return super(ProxyClient, self).__setattr__(name, value)
1227
 
        self._pipe.send(('setattr', name, value))
1228
 
 
1229
 
class ClientDBusTransitional(ClientDBus):
1230
 
    __metaclass__ = transitional_dbus_metaclass
1231
 
 
1232
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1233
 
    """A class to handle client connections.
1234
 
    
1235
 
    Instantiated once for each connection to handle it.
 
367
    def still_valid(self):
 
368
        """Has the timeout not yet passed for this client?"""
 
369
        now = datetime.datetime.now()
 
370
        if self.last_checked_ok is None:
 
371
            return now < (self.created + self.timeout)
 
372
        else:
 
373
            return now < (self.last_checked_ok + self.timeout)
 
374
 
 
375
 
 
376
def peer_certificate(session):
 
377
    "Return the peer's OpenPGP certificate as a bytestring"
 
378
    # If not an OpenPGP certificate...
 
379
    if gnutls.library.functions.gnutls_certificate_type_get\
 
380
            (session._c_object) \
 
381
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
382
        # ...do the normal thing
 
383
        return session.peer_certificate
 
384
    list_size = ctypes.c_uint()
 
385
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
386
        (session._c_object, ctypes.byref(list_size))
 
387
    if list_size.value == 0:
 
388
        return None
 
389
    cert = cert_list[0]
 
390
    return ctypes.string_at(cert.data, cert.size)
 
391
 
 
392
 
 
393
def fingerprint(openpgp):
 
394
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
395
    # New GnuTLS "datum" with the OpenPGP public key
 
396
    datum = gnutls.library.types.gnutls_datum_t\
 
397
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
398
                     ctypes.POINTER(ctypes.c_ubyte)),
 
399
         ctypes.c_uint(len(openpgp)))
 
400
    # New empty GnuTLS certificate
 
401
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
402
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
403
        (ctypes.byref(crt))
 
404
    # Import the OpenPGP public key into the certificate
 
405
    gnutls.library.functions.gnutls_openpgp_crt_import\
 
406
                    (crt, ctypes.byref(datum),
 
407
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
408
    # New buffer for the fingerprint
 
409
    buffer = ctypes.create_string_buffer(20)
 
410
    buffer_length = ctypes.c_size_t()
 
411
    # Get the fingerprint from the certificate into the buffer
 
412
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
413
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
414
    # Deinit the certificate
 
415
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
416
    # Convert the buffer to a Python bytestring
 
417
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
418
    # Convert the bytestring to hexadecimal notation
 
419
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
420
    return hex_fpr
 
421
 
 
422
 
 
423
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
424
    """A TCP request handler class.
 
425
    Instantiated by IPv6_TCPServer for each request to handle it.
1236
426
    Note: This will run in its own forked process."""
1237
427
    
1238
428
    def handle(self):
1239
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1240
 
            logger.info("TCP connection from: %s",
1241
 
                        unicode(self.client_address))
1242
 
            logger.debug("Pipe FD: %d",
1243
 
                         self.server.child_pipe.fileno())
1244
 
            
1245
 
            session = (gnutls.connection
1246
 
                       .ClientSession(self.request,
1247
 
                                      gnutls.connection
1248
 
                                      .X509Credentials()))
1249
 
            
1250
 
            # Note: gnutls.connection.X509Credentials is really a
1251
 
            # generic GnuTLS certificate credentials object so long as
1252
 
            # no X.509 keys are added to it.  Therefore, we can use it
1253
 
            # here despite using OpenPGP certificates.
1254
 
            
1255
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
1256
 
            #                      "+AES-256-CBC", "+SHA1",
1257
 
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
1258
 
            #                      "+DHE-DSS"))
1259
 
            # Use a fallback default, since this MUST be set.
1260
 
            priority = self.server.gnutls_priority
1261
 
            if priority is None:
1262
 
                priority = "NORMAL"
1263
 
            (gnutls.library.functions
1264
 
             .gnutls_priority_set_direct(session._c_object,
1265
 
                                         priority, None))
1266
 
            
1267
 
            # Start communication using the Mandos protocol
1268
 
            # Get protocol number
1269
 
            line = self.request.makefile().readline()
1270
 
            logger.debug("Protocol version: %r", line)
1271
 
            try:
1272
 
                if int(line.strip().split()[0]) > 1:
1273
 
                    raise RuntimeError
1274
 
            except (ValueError, IndexError, RuntimeError) as error:
1275
 
                logger.error("Unknown protocol version: %s", error)
1276
 
                return
1277
 
            
1278
 
            # Start GnuTLS connection
1279
 
            try:
1280
 
                session.handshake()
1281
 
            except gnutls.errors.GNUTLSError as error:
1282
 
                logger.warning("Handshake failed: %s", error)
1283
 
                # Do not run session.bye() here: the session is not
1284
 
                # established.  Just abandon the request.
1285
 
                return
1286
 
            logger.debug("Handshake succeeded")
1287
 
            
1288
 
            approval_required = False
1289
 
            try:
1290
 
                try:
1291
 
                    fpr = self.fingerprint(self.peer_certificate
1292
 
                                           (session))
1293
 
                except (TypeError,
1294
 
                        gnutls.errors.GNUTLSError) as error:
1295
 
                    logger.warning("Bad certificate: %s", error)
1296
 
                    return
1297
 
                logger.debug("Fingerprint: %s", fpr)
1298
 
                
1299
 
                try:
1300
 
                    client = ProxyClient(child_pipe, fpr,
1301
 
                                         self.client_address)
1302
 
                except KeyError:
1303
 
                    return
1304
 
                
1305
 
                if client.approval_delay:
1306
 
                    delay = client.approval_delay
1307
 
                    client.approvals_pending += 1
1308
 
                    approval_required = True
1309
 
                
1310
 
                while True:
1311
 
                    if not client.enabled:
1312
 
                        logger.info("Client %s is disabled",
1313
 
                                       client.name)
1314
 
                        if self.server.use_dbus:
1315
 
                            # Emit D-Bus signal
1316
 
                            client.Rejected("Disabled")                    
1317
 
                        return
1318
 
                    
1319
 
                    if client._approved or not client.approval_delay:
1320
 
                        #We are approved or approval is disabled
1321
 
                        break
1322
 
                    elif client._approved is None:
1323
 
                        logger.info("Client %s needs approval",
1324
 
                                    client.name)
1325
 
                        if self.server.use_dbus:
1326
 
                            # Emit D-Bus signal
1327
 
                            client.NeedApproval(
1328
 
                                client.approval_delay_milliseconds(),
1329
 
                                client.approved_by_default)
1330
 
                    else:
1331
 
                        logger.warning("Client %s was not approved",
1332
 
                                       client.name)
1333
 
                        if self.server.use_dbus:
1334
 
                            # Emit D-Bus signal
1335
 
                            client.Rejected("Denied")
1336
 
                        return
1337
 
                    
1338
 
                    #wait until timeout or approved
1339
 
                    #x = float(client._timedelta_to_milliseconds(delay))
1340
 
                    time = datetime.datetime.now()
1341
 
                    client.changedstate.acquire()
1342
 
                    client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1343
 
                    client.changedstate.release()
1344
 
                    time2 = datetime.datetime.now()
1345
 
                    if (time2 - time) >= delay:
1346
 
                        if not client.approved_by_default:
1347
 
                            logger.warning("Client %s timed out while"
1348
 
                                           " waiting for approval",
1349
 
                                           client.name)
1350
 
                            if self.server.use_dbus:
1351
 
                                # Emit D-Bus signal
1352
 
                                client.Rejected("Approval timed out")
1353
 
                            return
1354
 
                        else:
1355
 
                            break
1356
 
                    else:
1357
 
                        delay -= time2 - time
1358
 
                
1359
 
                sent_size = 0
1360
 
                while sent_size < len(client.secret):
1361
 
                    try:
1362
 
                        sent = session.send(client.secret[sent_size:])
1363
 
                    except gnutls.errors.GNUTLSError as error:
1364
 
                        logger.warning("gnutls send failed")
1365
 
                        return
1366
 
                    logger.debug("Sent: %d, remaining: %d",
1367
 
                                 sent, len(client.secret)
1368
 
                                 - (sent_size + sent))
1369
 
                    sent_size += sent
1370
 
                
1371
 
                logger.info("Sending secret to %s", client.name)
1372
 
                # bump the timeout as if seen
1373
 
                client.checked_ok(client.extended_timeout)
1374
 
                if self.server.use_dbus:
1375
 
                    # Emit D-Bus signal
1376
 
                    client.GotSecret()
1377
 
            
1378
 
            finally:
1379
 
                if approval_required:
1380
 
                    client.approvals_pending -= 1
1381
 
                try:
1382
 
                    session.bye()
1383
 
                except gnutls.errors.GNUTLSError as error:
1384
 
                    logger.warning("GnuTLS bye failed")
1385
 
    
1386
 
    @staticmethod
1387
 
    def peer_certificate(session):
1388
 
        "Return the peer's OpenPGP certificate as a bytestring"
1389
 
        # If not an OpenPGP certificate...
1390
 
        if (gnutls.library.functions
1391
 
            .gnutls_certificate_type_get(session._c_object)
1392
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1393
 
            # ...do the normal thing
1394
 
            return session.peer_certificate
1395
 
        list_size = ctypes.c_uint(1)
1396
 
        cert_list = (gnutls.library.functions
1397
 
                     .gnutls_certificate_get_peers
1398
 
                     (session._c_object, ctypes.byref(list_size)))
1399
 
        if not bool(cert_list) and list_size.value != 0:
1400
 
            raise gnutls.errors.GNUTLSError("error getting peer"
1401
 
                                            " certificate")
1402
 
        if list_size.value == 0:
1403
 
            return None
1404
 
        cert = cert_list[0]
1405
 
        return ctypes.string_at(cert.data, cert.size)
1406
 
    
1407
 
    @staticmethod
1408
 
    def fingerprint(openpgp):
1409
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1410
 
        # New GnuTLS "datum" with the OpenPGP public key
1411
 
        datum = (gnutls.library.types
1412
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1413
 
                                             ctypes.POINTER
1414
 
                                             (ctypes.c_ubyte)),
1415
 
                                 ctypes.c_uint(len(openpgp))))
1416
 
        # New empty GnuTLS certificate
1417
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1418
 
        (gnutls.library.functions
1419
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1420
 
        # Import the OpenPGP public key into the certificate
1421
 
        (gnutls.library.functions
1422
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1423
 
                                    gnutls.library.constants
1424
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1425
 
        # Verify the self signature in the key
1426
 
        crtverify = ctypes.c_uint()
1427
 
        (gnutls.library.functions
1428
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1429
 
                                         ctypes.byref(crtverify)))
1430
 
        if crtverify.value != 0:
1431
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1432
 
            raise (gnutls.errors.CertificateSecurityError
1433
 
                   ("Verify failed"))
1434
 
        # New buffer for the fingerprint
1435
 
        buf = ctypes.create_string_buffer(20)
1436
 
        buf_len = ctypes.c_size_t()
1437
 
        # Get the fingerprint from the certificate into the buffer
1438
 
        (gnutls.library.functions
1439
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1440
 
                                             ctypes.byref(buf_len)))
1441
 
        # Deinit the certificate
1442
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1443
 
        # Convert the buffer to a Python bytestring
1444
 
        fpr = ctypes.string_at(buf, buf_len.value)
1445
 
        # Convert the bytestring to hexadecimal notation
1446
 
        hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
1447
 
        return hex_fpr
1448
 
 
1449
 
 
1450
 
class MultiprocessingMixIn(object):
1451
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1452
 
    def sub_process_main(self, request, address):
1453
 
        try:
1454
 
            self.finish_request(request, address)
1455
 
        except:
1456
 
            self.handle_error(request, address)
1457
 
        self.close_request(request)
1458
 
            
1459
 
    def process_request(self, request, address):
1460
 
        """Start a new process to process the request."""
1461
 
        multiprocessing.Process(target = self.sub_process_main,
1462
 
                                args = (request, address)).start()
1463
 
 
1464
 
 
1465
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1466
 
    """ adds a pipe to the MixIn """
1467
 
    def process_request(self, request, client_address):
1468
 
        """Overrides and wraps the original process_request().
1469
 
        
1470
 
        This function creates a new pipe in self.pipe
1471
 
        """
1472
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1473
 
        
1474
 
        super(MultiprocessingMixInWithPipe,
1475
 
              self).process_request(request, client_address)
1476
 
        self.child_pipe.close()
1477
 
        self.add_pipe(parent_pipe)
1478
 
    
1479
 
    def add_pipe(self, parent_pipe):
1480
 
        """Dummy function; override as necessary"""
1481
 
        raise NotImplementedError
1482
 
 
1483
 
 
1484
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1485
 
                     socketserver.TCPServer, object):
1486
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1487
 
    
 
429
        logger.info(u"TCP connection from: %s",
 
430
                     unicode(self.client_address))
 
431
        session = gnutls.connection.ClientSession\
 
432
                  (self.request, gnutls.connection.X509Credentials())
 
433
        
 
434
        line = self.request.makefile().readline()
 
435
        logger.debug(u"Protocol version: %r", line)
 
436
        try:
 
437
            if int(line.strip().split()[0]) > 1:
 
438
                raise RuntimeError
 
439
        except (ValueError, IndexError, RuntimeError), error:
 
440
            logger.error(u"Unknown protocol version: %s", error)
 
441
            return
 
442
        
 
443
        # Note: gnutls.connection.X509Credentials is really a generic
 
444
        # GnuTLS certificate credentials object so long as no X.509
 
445
        # keys are added to it.  Therefore, we can use it here despite
 
446
        # using OpenPGP certificates.
 
447
        
 
448
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
449
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
450
        #                "+DHE-DSS"))
 
451
        priority = "NORMAL"             # Fallback default, since this
 
452
                                        # MUST be set.
 
453
        if self.server.settings["priority"]:
 
454
            priority = self.server.settings["priority"]
 
455
        gnutls.library.functions.gnutls_priority_set_direct\
 
456
            (session._c_object, priority, None);
 
457
        
 
458
        try:
 
459
            session.handshake()
 
460
        except gnutls.errors.GNUTLSError, error:
 
461
            logger.warning(u"Handshake failed: %s", error)
 
462
            # Do not run session.bye() here: the session is not
 
463
            # established.  Just abandon the request.
 
464
            return
 
465
        try:
 
466
            fpr = fingerprint(peer_certificate(session))
 
467
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
468
            logger.warning(u"Bad certificate: %s", error)
 
469
            session.bye()
 
470
            return
 
471
        logger.debug(u"Fingerprint: %s", fpr)
 
472
        client = None
 
473
        for c in self.server.clients:
 
474
            if c.fingerprint == fpr:
 
475
                client = c
 
476
                break
 
477
        if not client:
 
478
            logger.warning(u"Client not found for fingerprint: %s",
 
479
                           fpr)
 
480
            session.bye()
 
481
            return
 
482
        # Have to check if client.still_valid(), since it is possible
 
483
        # that the client timed out while establishing the GnuTLS
 
484
        # session.
 
485
        if not client.still_valid():
 
486
            logger.warning(u"Client %(name)s is invalid",
 
487
                           vars(client))
 
488
            session.bye()
 
489
            return
 
490
        sent_size = 0
 
491
        while sent_size < len(client.secret):
 
492
            sent = session.send(client.secret[sent_size:])
 
493
            logger.debug(u"Sent: %d, remaining: %d",
 
494
                         sent, len(client.secret)
 
495
                         - (sent_size + sent))
 
496
            sent_size += sent
 
497
        session.bye()
 
498
 
 
499
 
 
500
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
501
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
1488
502
    Attributes:
1489
 
        enabled:        Boolean; whether this server is activated yet
1490
 
        interface:      None or a network interface name (string)
1491
 
        use_ipv6:       Boolean; to use IPv6 or not
 
503
        settings:       Server settings
 
504
        clients:        Set() of Client objects
1492
505
    """
1493
 
    def __init__(self, server_address, RequestHandlerClass,
1494
 
                 interface=None, use_ipv6=True):
1495
 
        self.interface = interface
1496
 
        if use_ipv6:
1497
 
            self.address_family = socket.AF_INET6
1498
 
        socketserver.TCPServer.__init__(self, server_address,
1499
 
                                        RequestHandlerClass)
 
506
    address_family = socket.AF_INET6
 
507
    def __init__(self, *args, **kwargs):
 
508
        if "settings" in kwargs:
 
509
            self.settings = kwargs["settings"]
 
510
            del kwargs["settings"]
 
511
        if "clients" in kwargs:
 
512
            self.clients = kwargs["clients"]
 
513
            del kwargs["clients"]
 
514
        return super(type(self), self).__init__(*args, **kwargs)
1500
515
    def server_bind(self):
1501
516
        """This overrides the normal server_bind() function
1502
517
        to bind to an interface if one was specified, and also NOT to
1503
518
        bind to an address or port if they were not specified."""
1504
 
        if self.interface is not None:
1505
 
            if SO_BINDTODEVICE is None:
1506
 
                logger.error("SO_BINDTODEVICE does not exist;"
1507
 
                             " cannot bind to interface %s",
1508
 
                             self.interface)
1509
 
            else:
1510
 
                try:
1511
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1512
 
                                           SO_BINDTODEVICE,
1513
 
                                           str(self.interface
1514
 
                                               + '\0'))
1515
 
                except socket.error as error:
1516
 
                    if error[0] == errno.EPERM:
1517
 
                        logger.error("No permission to"
1518
 
                                     " bind to interface %s",
1519
 
                                     self.interface)
1520
 
                    elif error[0] == errno.ENOPROTOOPT:
1521
 
                        logger.error("SO_BINDTODEVICE not available;"
1522
 
                                     " cannot bind to interface %s",
1523
 
                                     self.interface)
1524
 
                    else:
1525
 
                        raise
 
519
        if self.settings["interface"]:
 
520
            # 25 is from /usr/include/asm-i486/socket.h
 
521
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
522
            try:
 
523
                self.socket.setsockopt(socket.SOL_SOCKET,
 
524
                                       SO_BINDTODEVICE,
 
525
                                       self.settings["interface"])
 
526
            except socket.error, error:
 
527
                if error[0] == errno.EPERM:
 
528
                    logger.error(u"No permission to"
 
529
                                 u" bind to interface %s",
 
530
                                 self.settings["interface"])
 
531
                else:
 
532
                    raise error
1526
533
        # Only bind(2) the socket if we really need to.
1527
534
        if self.server_address[0] or self.server_address[1]:
1528
535
            if not self.server_address[0]:
1529
 
                if self.address_family == socket.AF_INET6:
1530
 
                    any_address = "::" # in6addr_any
1531
 
                else:
1532
 
                    any_address = socket.INADDR_ANY
1533
 
                self.server_address = (any_address,
 
536
                in6addr_any = "::"
 
537
                self.server_address = (in6addr_any,
1534
538
                                       self.server_address[1])
1535
539
            elif not self.server_address[1]:
1536
540
                self.server_address = (self.server_address[0],
1537
541
                                       0)
1538
 
#                 if self.interface:
 
542
#                 if self.settings["interface"]:
1539
543
#                     self.server_address = (self.server_address[0],
1540
544
#                                            0, # port
1541
545
#                                            0, # flowinfo
1542
546
#                                            if_nametoindex
1543
 
#                                            (self.interface))
1544
 
            return socketserver.TCPServer.server_bind(self)
1545
 
 
1546
 
 
1547
 
class MandosServer(IPv6_TCPServer):
1548
 
    """Mandos server.
1549
 
    
1550
 
    Attributes:
1551
 
        clients:        set of Client objects
1552
 
        gnutls_priority GnuTLS priority string
1553
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1554
 
    
1555
 
    Assumes a gobject.MainLoop event loop.
1556
 
    """
1557
 
    def __init__(self, server_address, RequestHandlerClass,
1558
 
                 interface=None, use_ipv6=True, clients=None,
1559
 
                 gnutls_priority=None, use_dbus=True):
1560
 
        self.enabled = False
1561
 
        self.clients = clients
1562
 
        if self.clients is None:
1563
 
            self.clients = set()
1564
 
        self.use_dbus = use_dbus
1565
 
        self.gnutls_priority = gnutls_priority
1566
 
        IPv6_TCPServer.__init__(self, server_address,
1567
 
                                RequestHandlerClass,
1568
 
                                interface = interface,
1569
 
                                use_ipv6 = use_ipv6)
1570
 
    def server_activate(self):
1571
 
        if self.enabled:
1572
 
            return socketserver.TCPServer.server_activate(self)
1573
 
    def enable(self):
1574
 
        self.enabled = True
1575
 
    def add_pipe(self, parent_pipe):
1576
 
        # Call "handle_ipc" for both data and EOF events
1577
 
        gobject.io_add_watch(parent_pipe.fileno(),
1578
 
                             gobject.IO_IN | gobject.IO_HUP,
1579
 
                             functools.partial(self.handle_ipc,
1580
 
                                               parent_pipe = parent_pipe))
1581
 
        
1582
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1583
 
                   client_object=None):
1584
 
        condition_names = {
1585
 
            gobject.IO_IN: "IN",   # There is data to read.
1586
 
            gobject.IO_OUT: "OUT", # Data can be written (without
1587
 
                                    # blocking).
1588
 
            gobject.IO_PRI: "PRI", # There is urgent data to read.
1589
 
            gobject.IO_ERR: "ERR", # Error condition.
1590
 
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
1591
 
                                    # broken, usually for pipes and
1592
 
                                    # sockets).
1593
 
            }
1594
 
        conditions_string = ' | '.join(name
1595
 
                                       for cond, name in
1596
 
                                       condition_names.iteritems()
1597
 
                                       if cond & condition)
1598
 
        # error or the other end of multiprocessing.Pipe has closed
1599
 
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1600
 
            return False
1601
 
        
1602
 
        # Read a request from the child
1603
 
        request = parent_pipe.recv()
1604
 
        command = request[0]
1605
 
        
1606
 
        if command == 'init':
1607
 
            fpr = request[1]
1608
 
            address = request[2]
1609
 
            
1610
 
            for c in self.clients:
1611
 
                if c.fingerprint == fpr:
1612
 
                    client = c
1613
 
                    break
1614
 
            else:
1615
 
                logger.info("Client not found for fingerprint: %s, ad"
1616
 
                            "dress: %s", fpr, address)
1617
 
                if self.use_dbus:
1618
 
                    # Emit D-Bus signal
1619
 
                    mandos_dbus_service.ClientNotFound(fpr, address[0])
1620
 
                parent_pipe.send(False)
1621
 
                return False
1622
 
            
1623
 
            gobject.io_add_watch(parent_pipe.fileno(),
1624
 
                                 gobject.IO_IN | gobject.IO_HUP,
1625
 
                                 functools.partial(self.handle_ipc,
1626
 
                                                   parent_pipe = parent_pipe,
1627
 
                                                   client_object = client))
1628
 
            parent_pipe.send(True)
1629
 
            # remove the old hook in favor of the new above hook on same fileno
1630
 
            return False
1631
 
        if command == 'funcall':
1632
 
            funcname = request[1]
1633
 
            args = request[2]
1634
 
            kwargs = request[3]
1635
 
            
1636
 
            parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1637
 
        
1638
 
        if command == 'getattr':
1639
 
            attrname = request[1]
1640
 
            if callable(client_object.__getattribute__(attrname)):
1641
 
                parent_pipe.send(('function',))
1642
 
            else:
1643
 
                parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1644
 
        
1645
 
        if command == 'setattr':
1646
 
            attrname = request[1]
1647
 
            value = request[2]
1648
 
            setattr(client_object, attrname, value)
1649
 
        
1650
 
        return True
 
547
#                                            (self.settings
 
548
#                                             ["interface"]))
 
549
            return super(type(self), self).server_bind()
1651
550
 
1652
551
 
1653
552
def string_to_delta(interval):
1654
553
    """Parse a string and return a datetime.timedelta
1655
 
    
 
554
 
1656
555
    >>> string_to_delta('7d')
1657
556
    datetime.timedelta(7)
1658
557
    >>> string_to_delta('60s')
1661
560
    datetime.timedelta(0, 3600)
1662
561
    >>> string_to_delta('24h')
1663
562
    datetime.timedelta(1)
1664
 
    >>> string_to_delta('1w')
 
563
    >>> string_to_delta(u'1w')
1665
564
    datetime.timedelta(7)
1666
 
    >>> string_to_delta('5m 30s')
1667
 
    datetime.timedelta(0, 330)
1668
565
    """
1669
 
    timevalue = datetime.timedelta(0)
1670
 
    for s in interval.split():
1671
 
        try:
1672
 
            suffix = unicode(s[-1])
1673
 
            value = int(s[:-1])
1674
 
            if suffix == "d":
1675
 
                delta = datetime.timedelta(value)
1676
 
            elif suffix == "s":
1677
 
                delta = datetime.timedelta(0, value)
1678
 
            elif suffix == "m":
1679
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1680
 
            elif suffix == "h":
1681
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1682
 
            elif suffix == "w":
1683
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1684
 
            else:
1685
 
                raise ValueError("Unknown suffix %r" % suffix)
1686
 
        except (ValueError, IndexError) as e:
1687
 
            raise ValueError(*(e.args))
1688
 
        timevalue += delta
1689
 
    return timevalue
1690
 
 
 
566
    try:
 
567
        suffix=unicode(interval[-1])
 
568
        value=int(interval[:-1])
 
569
        if suffix == u"d":
 
570
            delta = datetime.timedelta(value)
 
571
        elif suffix == u"s":
 
572
            delta = datetime.timedelta(0, value)
 
573
        elif suffix == u"m":
 
574
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
575
        elif suffix == u"h":
 
576
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
577
        elif suffix == u"w":
 
578
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
579
        else:
 
580
            raise ValueError
 
581
    except (ValueError, IndexError):
 
582
        raise ValueError
 
583
    return delta
 
584
 
 
585
 
 
586
def server_state_changed(state):
 
587
    """Derived from the Avahi example code"""
 
588
    if state == avahi.SERVER_COLLISION:
 
589
        logger.error(u"Server name collision")
 
590
        service.remove()
 
591
    elif state == avahi.SERVER_RUNNING:
 
592
        service.add()
 
593
 
 
594
 
 
595
def entry_group_state_changed(state, error):
 
596
    """Derived from the Avahi example code"""
 
597
    logger.debug(u"state change: %i", state)
 
598
    
 
599
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
600
        logger.debug(u"Service established.")
 
601
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
602
        logger.warning(u"Service name collision.")
 
603
        service.rename()
 
604
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
605
        logger.critical(u"Error in group state changed %s",
 
606
                        unicode(error))
 
607
        raise AvahiGroupError("State changed: %s", str(error))
1691
608
 
1692
609
def if_nametoindex(interface):
1693
 
    """Call the C function if_nametoindex(), or equivalent
1694
 
    
1695
 
    Note: This function cannot accept a unicode string."""
 
610
    """Call the C function if_nametoindex(), or equivalent"""
1696
611
    global if_nametoindex
1697
612
    try:
1698
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1699
 
                          (ctypes.util.find_library("c"))
1700
 
                          .if_nametoindex)
 
613
        if "ctypes.util" not in sys.modules:
 
614
            import ctypes.util
 
615
        if_nametoindex = ctypes.cdll.LoadLibrary\
 
616
            (ctypes.util.find_library("c")).if_nametoindex
1701
617
    except (OSError, AttributeError):
1702
 
        logger.warning("Doing if_nametoindex the hard way")
 
618
        if "struct" not in sys.modules:
 
619
            import struct
 
620
        if "fcntl" not in sys.modules:
 
621
            import fcntl
1703
622
        def if_nametoindex(interface):
1704
623
            "Get an interface index the hard way, i.e. using fcntl()"
1705
624
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
1706
 
            with contextlib.closing(socket.socket()) as s:
1707
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1708
 
                                    struct.pack(str("16s16x"),
1709
 
                                                interface))
1710
 
            interface_index = struct.unpack(str("I"),
1711
 
                                            ifreq[16:20])[0]
 
625
            s = socket.socket()
 
626
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
627
                                struct.pack("16s16x", interface))
 
628
            s.close()
 
629
            interface_index = struct.unpack("I", ifreq[16:20])[0]
1712
630
            return interface_index
1713
631
    return if_nametoindex(interface)
1714
632
 
1715
633
 
1716
634
def daemon(nochdir = False, noclose = False):
1717
635
    """See daemon(3).  Standard BSD Unix function.
1718
 
    
1719
636
    This should really exist as os.daemon, but it doesn't (yet)."""
1720
637
    if os.fork():
1721
638
        sys.exit()
1729
646
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1730
647
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1731
648
            raise OSError(errno.ENODEV,
1732
 
                          "%s not a character device"
1733
 
                          % os.path.devnull)
 
649
                          "/dev/null not a character device")
1734
650
        os.dup2(null, sys.stdin.fileno())
1735
651
        os.dup2(null, sys.stdout.fileno())
1736
652
        os.dup2(null, sys.stderr.fileno())
1739
655
 
1740
656
 
1741
657
def main():
1742
 
    
1743
 
    ##################################################################
1744
 
    # Parsing of options, both command line and config file
1745
 
    
1746
 
    parser = argparse.ArgumentParser()
1747
 
    parser.add_argument("-v", "--version", action="version",
1748
 
                        version = "%%(prog)s %s" % version,
1749
 
                        help="show version number and exit")
1750
 
    parser.add_argument("-i", "--interface", metavar="IF",
1751
 
                        help="Bind to interface IF")
1752
 
    parser.add_argument("-a", "--address",
1753
 
                        help="Address to listen for requests on")
1754
 
    parser.add_argument("-p", "--port", type=int,
1755
 
                        help="Port number to receive requests on")
1756
 
    parser.add_argument("--check", action="store_true",
1757
 
                        help="Run self-test")
1758
 
    parser.add_argument("--debug", action="store_true",
1759
 
                        help="Debug mode; run in foreground and log"
1760
 
                        " to terminal")
1761
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
1762
 
                        help="Debug level for stdout output")
1763
 
    parser.add_argument("--priority", help="GnuTLS"
1764
 
                        " priority string (see GnuTLS documentation)")
1765
 
    parser.add_argument("--servicename",
1766
 
                        metavar="NAME", help="Zeroconf service name")
1767
 
    parser.add_argument("--configdir",
1768
 
                        default="/etc/mandos", metavar="DIR",
1769
 
                        help="Directory to search for configuration"
1770
 
                        " files")
1771
 
    parser.add_argument("--no-dbus", action="store_false",
1772
 
                        dest="use_dbus", help="Do not provide D-Bus"
1773
 
                        " system bus interface")
1774
 
    parser.add_argument("--no-ipv6", action="store_false",
1775
 
                        dest="use_ipv6", help="Do not use IPv6")
1776
 
    options = parser.parse_args()
 
658
    global main_loop_started
 
659
    main_loop_started = False
 
660
    
 
661
    parser = OptionParser(version = "%%prog %s" % version)
 
662
    parser.add_option("-i", "--interface", type="string",
 
663
                      metavar="IF", help="Bind to interface IF")
 
664
    parser.add_option("-a", "--address", type="string",
 
665
                      help="Address to listen for requests on")
 
666
    parser.add_option("-p", "--port", type="int",
 
667
                      help="Port number to receive requests on")
 
668
    parser.add_option("--check", action="store_true", default=False,
 
669
                      help="Run self-test")
 
670
    parser.add_option("--debug", action="store_true",
 
671
                      help="Debug mode; run in foreground and log to"
 
672
                      " terminal")
 
673
    parser.add_option("--priority", type="string", help="GnuTLS"
 
674
                      " priority string (see GnuTLS documentation)")
 
675
    parser.add_option("--servicename", type="string", metavar="NAME",
 
676
                      help="Zeroconf service name")
 
677
    parser.add_option("--configdir", type="string",
 
678
                      default="/etc/mandos", metavar="DIR",
 
679
                      help="Directory to search for configuration"
 
680
                      " files")
 
681
    (options, args) = parser.parse_args()
1777
682
    
1778
683
    if options.check:
1779
684
        import doctest
1788
693
                        "priority":
1789
694
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1790
695
                        "servicename": "Mandos",
1791
 
                        "use_dbus": "True",
1792
 
                        "use_ipv6": "True",
1793
 
                        "debuglevel": "",
1794
696
                        }
1795
697
    
1796
698
    # Parse config file for server-global settings
1797
 
    server_config = configparser.SafeConfigParser(server_defaults)
 
699
    server_config = ConfigParser.SafeConfigParser(server_defaults)
1798
700
    del server_defaults
1799
 
    server_config.read(os.path.join(options.configdir,
1800
 
                                    "mandos.conf"))
 
701
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
702
    server_section = "server"
1801
703
    # Convert the SafeConfigParser object to a dict
1802
 
    server_settings = server_config.defaults()
1803
 
    # Use the appropriate methods on the non-string config options
1804
 
    for option in ("debug", "use_dbus", "use_ipv6"):
1805
 
        server_settings[option] = server_config.getboolean("DEFAULT",
1806
 
                                                           option)
1807
 
    if server_settings["port"]:
1808
 
        server_settings["port"] = server_config.getint("DEFAULT",
1809
 
                                                       "port")
 
704
    server_settings = dict(server_config.items(server_section))
 
705
    # Use getboolean on the boolean config option
 
706
    server_settings["debug"] = server_config.getboolean\
 
707
                               (server_section, "debug")
1810
708
    del server_config
1811
709
    
1812
710
    # Override the settings from the config file with command line
1813
711
    # options, if set.
1814
712
    for option in ("interface", "address", "port", "debug",
1815
 
                   "priority", "servicename", "configdir",
1816
 
                   "use_dbus", "use_ipv6", "debuglevel"):
 
713
                   "priority", "servicename", "configdir"):
1817
714
        value = getattr(options, option)
1818
715
        if value is not None:
1819
716
            server_settings[option] = value
1820
717
    del options
1821
 
    # Force all strings to be unicode
1822
 
    for option in server_settings.keys():
1823
 
        if type(server_settings[option]) is str:
1824
 
            server_settings[option] = unicode(server_settings[option])
1825
718
    # Now we have our good server settings in "server_settings"
1826
719
    
1827
 
    ##################################################################
1828
 
    
1829
 
    # For convenience
1830
720
    debug = server_settings["debug"]
1831
 
    debuglevel = server_settings["debuglevel"]
1832
 
    use_dbus = server_settings["use_dbus"]
1833
 
    use_ipv6 = server_settings["use_ipv6"]
 
721
    
 
722
    if not debug:
 
723
        syslogger.setLevel(logging.WARNING)
 
724
        console.setLevel(logging.WARNING)
1834
725
    
1835
726
    if server_settings["servicename"] != "Mandos":
1836
 
        syslogger.setFormatter(logging.Formatter
1837
 
                               ('Mandos (%s) [%%(process)d]:'
1838
 
                                ' %%(levelname)s: %%(message)s'
 
727
        syslogger.setFormatter(logging.Formatter\
 
728
                               ('Mandos (%s): %%(levelname)s:'
 
729
                                ' %%(message)s'
1839
730
                                % server_settings["servicename"]))
1840
731
    
1841
732
    # Parse config file with clients
1842
 
    client_defaults = { "timeout": "5m",
1843
 
                        "extended_timeout": "15m",
1844
 
                        "interval": "2m",
 
733
    client_defaults = { "timeout": "1h",
 
734
                        "interval": "5m",
1845
735
                        "checker": "fping -q -- %%(host)s",
1846
 
                        "host": "",
1847
 
                        "approval_delay": "0s",
1848
 
                        "approval_duration": "1s",
1849
736
                        }
1850
 
    client_config = configparser.SafeConfigParser(client_defaults)
 
737
    client_config = ConfigParser.SafeConfigParser(client_defaults)
1851
738
    client_config.read(os.path.join(server_settings["configdir"],
1852
739
                                    "clients.conf"))
1853
740
    
1854
 
    global mandos_dbus_service
1855
 
    mandos_dbus_service = None
1856
 
    
1857
 
    tcp_server = MandosServer((server_settings["address"],
1858
 
                               server_settings["port"]),
1859
 
                              ClientHandler,
1860
 
                              interface=(server_settings["interface"]
1861
 
                                         or None),
1862
 
                              use_ipv6=use_ipv6,
1863
 
                              gnutls_priority=
1864
 
                              server_settings["priority"],
1865
 
                              use_dbus=use_dbus)
1866
 
    if not debug:
1867
 
        pidfilename = "/var/run/mandos.pid"
1868
 
        try:
1869
 
            pidfile = open(pidfilename, "w")
1870
 
        except IOError:
1871
 
            logger.error("Could not open file %r", pidfilename)
1872
 
    
1873
 
    try:
1874
 
        uid = pwd.getpwnam("_mandos").pw_uid
1875
 
        gid = pwd.getpwnam("_mandos").pw_gid
1876
 
    except KeyError:
1877
 
        try:
1878
 
            uid = pwd.getpwnam("mandos").pw_uid
1879
 
            gid = pwd.getpwnam("mandos").pw_gid
1880
 
        except KeyError:
1881
 
            try:
1882
 
                uid = pwd.getpwnam("nobody").pw_uid
1883
 
                gid = pwd.getpwnam("nobody").pw_gid
1884
 
            except KeyError:
1885
 
                uid = 65534
1886
 
                gid = 65534
1887
 
    try:
1888
 
        os.setgid(gid)
1889
 
        os.setuid(uid)
1890
 
    except OSError as error:
1891
 
        if error[0] != errno.EPERM:
1892
 
            raise error
1893
 
    
1894
 
    if not debug and not debuglevel:
1895
 
        syslogger.setLevel(logging.WARNING)
1896
 
        console.setLevel(logging.WARNING)
1897
 
    if debuglevel:
1898
 
        level = getattr(logging, debuglevel.upper())
1899
 
        syslogger.setLevel(level)
1900
 
        console.setLevel(level)
1901
 
    
1902
 
    if debug:
1903
 
        # Enable all possible GnuTLS debugging
1904
 
        
1905
 
        # "Use a log level over 10 to enable all debugging options."
1906
 
        # - GnuTLS manual
1907
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1908
 
        
1909
 
        @gnutls.library.types.gnutls_log_func
1910
 
        def debug_gnutls(level, string):
1911
 
            logger.debug("GnuTLS: %s", string[:-1])
1912
 
        
1913
 
        (gnutls.library.functions
1914
 
         .gnutls_global_set_log_function(debug_gnutls))
1915
 
        
1916
 
        # Redirect stdin so all checkers get /dev/null
1917
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1918
 
        os.dup2(null, sys.stdin.fileno())
1919
 
        if null > 2:
1920
 
            os.close(null)
1921
 
    else:
1922
 
        # No console logging
1923
 
        logger.removeHandler(console)
1924
 
    
1925
 
    # Need to fork before connecting to D-Bus
1926
 
    if not debug:
1927
 
        # Close all input and output, do double fork, etc.
1928
 
        daemon()
 
741
    global service
 
742
    service = AvahiService(name = server_settings["servicename"],
 
743
                           type = "_mandos._tcp", );
 
744
    if server_settings["interface"]:
 
745
        service.interface = if_nametoindex(server_settings["interface"])
1929
746
    
1930
747
    global main_loop
 
748
    global bus
 
749
    global server
1931
750
    # From the Avahi example code
1932
751
    DBusGMainLoop(set_as_default=True )
1933
752
    main_loop = gobject.MainLoop()
1934
753
    bus = dbus.SystemBus()
 
754
    server = dbus.Interface(
 
755
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
756
            avahi.DBUS_INTERFACE_SERVER )
1935
757
    # End of Avahi example code
1936
 
    if use_dbus:
1937
 
        try:
1938
 
            bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",
1939
 
                                            bus, do_not_queue=True)
1940
 
            bus_name2 = dbus.service.BusName("se.recompile.Mandos",
1941
 
                                            bus, do_not_queue=True)
1942
 
        except dbus.exceptions.NameExistsException as e:
1943
 
            logger.error(unicode(e) + ", disabling D-Bus")
1944
 
            use_dbus = False
1945
 
            server_settings["use_dbus"] = False
1946
 
            tcp_server.use_dbus = False
1947
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1948
 
    service = AvahiService(name = server_settings["servicename"],
1949
 
                           servicetype = "_mandos._tcp",
1950
 
                           protocol = protocol, bus = bus)
1951
 
    if server_settings["interface"]:
1952
 
        service.interface = (if_nametoindex
1953
 
                             (str(server_settings["interface"])))
1954
 
    
1955
 
    global multiprocessing_manager
1956
 
    multiprocessing_manager = multiprocessing.Manager()
1957
 
    
1958
 
    client_class = Client
1959
 
    if use_dbus:
1960
 
        client_class = functools.partial(ClientDBusTransitional, bus = bus)        
1961
 
    def client_config_items(config, section):
1962
 
        special_settings = {
1963
 
            "approved_by_default":
1964
 
                lambda: config.getboolean(section,
1965
 
                                          "approved_by_default"),
1966
 
            }
1967
 
        for name, value in config.items(section):
1968
 
            try:
1969
 
                yield (name, special_settings[name]())
1970
 
            except KeyError:
1971
 
                yield (name, value)
1972
 
    
1973
 
    tcp_server.clients.update(set(
1974
 
            client_class(name = section,
1975
 
                         config= dict(client_config_items(
1976
 
                        client_config, section)))
1977
 
            for section in client_config.sections()))
1978
 
    if not tcp_server.clients:
1979
 
        logger.warning("No clients defined")
1980
 
        
1981
 
    if not debug:
1982
 
        try:
1983
 
            with pidfile:
1984
 
                pid = os.getpid()
1985
 
                pidfile.write(str(pid) + "\n".encode("utf-8"))
1986
 
            del pidfile
1987
 
        except IOError:
1988
 
            logger.error("Could not write to file %r with PID %d",
1989
 
                         pidfilename, pid)
1990
 
        except NameError:
1991
 
            # "pidfile" was never created
1992
 
            pass
1993
 
        del pidfilename
1994
 
        
 
758
    
 
759
    clients = Set()
 
760
    def remove_from_clients(client):
 
761
        clients.remove(client)
 
762
        if not clients:
 
763
            logger.critical(u"No clients left, exiting")
 
764
            sys.exit()
 
765
    
 
766
    clients.update(Set(Client(name = section,
 
767
                              stop_hook = remove_from_clients,
 
768
                              config
 
769
                              = dict(client_config.items(section)))
 
770
                       for section in client_config.sections()))
 
771
    if not clients:
 
772
        logger.critical(u"No clients defined")
 
773
        sys.exit(1)
 
774
    
 
775
    if not debug:
 
776
        logger.removeHandler(console)
 
777
        daemon()
 
778
    
 
779
    pidfilename = "/var/run/mandos/mandos.pid"
 
780
    pid = os.getpid()
 
781
    try:
 
782
        pidfile = open(pidfilename, "w")
 
783
        pidfile.write(str(pid) + "\n")
 
784
        pidfile.close()
 
785
        del pidfile
 
786
    except IOError, err:
 
787
        logger.error(u"Could not write %s file with PID %d",
 
788
                     pidfilename, os.getpid())
 
789
    
 
790
    def cleanup():
 
791
        "Cleanup function; run on exit"
 
792
        global group
 
793
        # From the Avahi example code
 
794
        if not group is None:
 
795
            group.Free()
 
796
            group = None
 
797
        # End of Avahi example code
 
798
        
 
799
        while clients:
 
800
            client = clients.pop()
 
801
            client.stop_hook = None
 
802
            client.stop()
 
803
    
 
804
    atexit.register(cleanup)
 
805
    
 
806
    if not debug:
1995
807
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1996
 
    
1997
808
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1998
809
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1999
810
    
2000
 
    if use_dbus:
2001
 
        class MandosDBusService(dbus.service.Object):
2002
 
            """A D-Bus proxy object"""
2003
 
            def __init__(self):
2004
 
                dbus.service.Object.__init__(self, bus, "/")
2005
 
            _interface = "se.bsnet.fukt.Mandos"
2006
 
            
2007
 
            @dbus.service.signal(_interface, signature="o")
2008
 
            def ClientAdded(self, objpath):
2009
 
                "D-Bus signal"
2010
 
                pass
2011
 
            
2012
 
            @dbus.service.signal(_interface, signature="ss")
2013
 
            def ClientNotFound(self, fingerprint, address):
2014
 
                "D-Bus signal"
2015
 
                pass
2016
 
            
2017
 
            @dbus.service.signal(_interface, signature="os")
2018
 
            def ClientRemoved(self, objpath, name):
2019
 
                "D-Bus signal"
2020
 
                pass
2021
 
            
2022
 
            @dbus.service.method(_interface, out_signature="ao")
2023
 
            def GetAllClients(self):
2024
 
                "D-Bus method"
2025
 
                return dbus.Array(c.dbus_object_path
2026
 
                                  for c in tcp_server.clients)
2027
 
            
2028
 
            @dbus.service.method(_interface,
2029
 
                                 out_signature="a{oa{sv}}")
2030
 
            def GetAllClientsWithProperties(self):
2031
 
                "D-Bus method"
2032
 
                return dbus.Dictionary(
2033
 
                    ((c.dbus_object_path, c.GetAll(""))
2034
 
                     for c in tcp_server.clients),
2035
 
                    signature="oa{sv}")
2036
 
            
2037
 
            @dbus.service.method(_interface, in_signature="o")
2038
 
            def RemoveClient(self, object_path):
2039
 
                "D-Bus method"
2040
 
                for c in tcp_server.clients:
2041
 
                    if c.dbus_object_path == object_path:
2042
 
                        tcp_server.clients.remove(c)
2043
 
                        c.remove_from_connection()
2044
 
                        # Don't signal anything except ClientRemoved
2045
 
                        c.disable(quiet=True)
2046
 
                        # Emit D-Bus signal
2047
 
                        self.ClientRemoved(object_path, c.name)
2048
 
                        return
2049
 
                raise KeyError(object_path)
2050
 
            
2051
 
            del _interface
2052
 
        
2053
 
        class MandosDBusServiceTransitional(MandosDBusService):
2054
 
            __metaclass__ = transitional_dbus_metaclass
2055
 
        mandos_dbus_service = MandosDBusServiceTransitional()
2056
 
    
2057
 
    def cleanup():
2058
 
        "Cleanup function; run on exit"
2059
 
        service.cleanup()
2060
 
        
2061
 
        while tcp_server.clients:
2062
 
            client = tcp_server.clients.pop()
2063
 
            if use_dbus:
2064
 
                client.remove_from_connection()
2065
 
            client.disable_hook = None
2066
 
            # Don't signal anything except ClientRemoved
2067
 
            client.disable(quiet=True)
2068
 
            if use_dbus:
2069
 
                # Emit D-Bus signal
2070
 
                mandos_dbus_service.ClientRemoved(client.dbus_object_path,
2071
 
                                                  client.name)
2072
 
    
2073
 
    atexit.register(cleanup)
2074
 
    
2075
 
    for client in tcp_server.clients:
2076
 
        if use_dbus:
2077
 
            # Emit D-Bus signal
2078
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
2079
 
        client.enable()
2080
 
    
2081
 
    tcp_server.enable()
2082
 
    tcp_server.server_activate()
2083
 
    
 
811
    for client in clients:
 
812
        client.start()
 
813
    
 
814
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
815
                                 server_settings["port"]),
 
816
                                tcp_handler,
 
817
                                settings=server_settings,
 
818
                                clients=clients)
2084
819
    # Find out what port we got
2085
820
    service.port = tcp_server.socket.getsockname()[1]
2086
 
    if use_ipv6:
2087
 
        logger.info("Now listening on address %r, port %d,"
2088
 
                    " flowinfo %d, scope_id %d"
2089
 
                    % tcp_server.socket.getsockname())
2090
 
    else:                       # IPv4
2091
 
        logger.info("Now listening on address %r, port %d"
2092
 
                    % tcp_server.socket.getsockname())
 
821
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
 
822
                u" scope_id %d" % tcp_server.socket.getsockname())
2093
823
    
2094
824
    #service.interface = tcp_server.socket.getsockname()[3]
2095
825
    
2096
826
    try:
2097
827
        # From the Avahi example code
 
828
        server.connect_to_signal("StateChanged", server_state_changed)
2098
829
        try:
2099
 
            service.activate()
2100
 
        except dbus.exceptions.DBusException as error:
2101
 
            logger.critical("DBusException: %s", error)
2102
 
            cleanup()
 
830
            server_state_changed(server.GetState())
 
831
        except dbus.exceptions.DBusException, error:
 
832
            logger.critical(u"DBusException: %s", error)
2103
833
            sys.exit(1)
2104
834
        # End of Avahi example code
2105
835
        
2106
836
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2107
837
                             lambda *args, **kwargs:
2108
 
                             (tcp_server.handle_request
2109
 
                              (*args[2:], **kwargs) or True))
 
838
                             tcp_server.handle_request\
 
839
                             (*args[2:], **kwargs) or True)
2110
840
        
2111
 
        logger.debug("Starting main loop")
 
841
        logger.debug(u"Starting main loop")
 
842
        main_loop_started = True
2112
843
        main_loop.run()
2113
 
    except AvahiError as error:
2114
 
        logger.critical("AvahiError: %s", error)
2115
 
        cleanup()
 
844
    except AvahiError, error:
 
845
        logger.critical(u"AvahiError: %s" + unicode(error))
2116
846
        sys.exit(1)
2117
847
    except KeyboardInterrupt:
2118
848
        if debug:
2119
 
            print("", file=sys.stderr)
2120
 
        logger.debug("Server received KeyboardInterrupt")
2121
 
    logger.debug("Server exiting")
2122
 
    # Must run before the D-Bus bus name gets deregistered
2123
 
    cleanup()
2124
 
 
 
849
            print
2125
850
 
2126
851
if __name__ == '__main__':
2127
852
    main()