/mandos/trunk

To get this branch, use:
bzr branch http://bzr.recompile.se/loggerhead/mandos/trunk

« back to all changes in this revision

Viewing changes to server.py

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

Show diffs side-by-side

added added

removed removed

Lines of Context:
1
1
#!/usr/bin/python
2
 
# -*- mode: python; coding: utf-8 -*-
3
 
4
 
# Mandos server - give out binary blobs to connecting clients.
5
 
6
 
# This program is partly derived from an example program for an Avahi
7
 
# service publisher, downloaded from
8
 
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add", "remove", "server_state_changed",
10
 
# "entry_group_state_changed", "cleanup", and "activate" in the
11
 
# "AvahiService" class, and some lines in "main".
12
 
13
 
# Everything else is
14
 
# Copyright © 2008-2011 Teddy Hogeborn
15
 
# Copyright © 2008-2011 Björn Påhlsson
16
 
17
 
# This program is free software: you can redistribute it and/or modify
18
 
# it under the terms of the GNU General Public License as published by
19
 
# the Free Software Foundation, either version 3 of the License, or
20
 
# (at your option) any later version.
21
 
#
22
 
#     This program is distributed in the hope that it will be useful,
23
 
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
24
 
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25
 
#     GNU General Public License for more details.
26
 
27
 
# You should have received a copy of the GNU General Public License
28
 
# along with this program.  If not, see
29
 
# <http://www.gnu.org/licenses/>.
30
 
31
 
# Contact the authors at <mandos@fukt.bsnet.se>.
32
 
33
 
 
34
 
from __future__ import (division, absolute_import, print_function,
35
 
                        unicode_literals)
36
 
 
37
 
import SocketServer as socketserver
 
2
 
 
3
from __future__ import division
 
4
 
 
5
import SocketServer
38
6
import socket
39
 
import argparse
 
7
import select
 
8
from optparse import OptionParser
40
9
import datetime
41
10
import errno
42
11
import gnutls.crypto
45
14
import gnutls.library.functions
46
15
import gnutls.library.constants
47
16
import gnutls.library.types
48
 
import ConfigParser as configparser
 
17
import ConfigParser
49
18
import sys
50
19
import re
51
20
import os
52
21
import signal
 
22
from sets import Set
53
23
import subprocess
54
 
import atexit
55
 
import stat
56
 
import logging
57
 
import logging.handlers
58
 
import pwd
59
 
import contextlib
60
 
import struct
61
 
import fcntl
62
 
import functools
63
 
import cPickle as pickle
64
 
import multiprocessing
65
 
import types
66
24
 
67
25
import dbus
68
 
import dbus.service
69
26
import gobject
70
27
import avahi
71
28
from dbus.mainloop.glib import DBusGMainLoop
72
29
import ctypes
73
 
import ctypes.util
74
 
import xml.dom.minidom
75
 
import inspect
76
 
 
77
 
try:
78
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
79
 
except AttributeError:
80
 
    try:
81
 
        from IN import SO_BINDTODEVICE
82
 
    except ImportError:
83
 
        SO_BINDTODEVICE = None
84
 
 
85
 
 
86
 
version = "1.3.1"
87
 
 
88
 
#logger = logging.getLogger('mandos')
 
30
 
 
31
import logging
 
32
import logging.handlers
 
33
 
 
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
 
35
 
89
36
logger = logging.Logger('mandos')
90
 
syslogger = (logging.handlers.SysLogHandler
91
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
92
 
              address = str("/dev/log")))
93
 
syslogger.setFormatter(logging.Formatter
94
 
                       ('Mandos [%(process)d]: %(levelname)s:'
95
 
                        ' %(message)s'))
96
 
logger.addHandler(syslogger)
97
 
 
98
 
console = logging.StreamHandler()
99
 
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
100
 
                                       ' %(levelname)s:'
101
 
                                       ' %(message)s'))
102
 
logger.addHandler(console)
103
 
 
104
 
class AvahiError(Exception):
105
 
    def __init__(self, value, *args, **kwargs):
106
 
        self.value = value
107
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
108
 
    def __unicode__(self):
109
 
        return unicode(repr(self.value))
110
 
 
111
 
class AvahiServiceError(AvahiError):
112
 
    pass
113
 
 
114
 
class AvahiGroupError(AvahiError):
115
 
    pass
116
 
 
117
 
 
118
 
class AvahiService(object):
119
 
    """An Avahi (Zeroconf) service.
120
 
    
121
 
    Attributes:
122
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
123
 
               Used to optionally bind to the specified interface.
124
 
    name: string; Example: 'Mandos'
125
 
    type: string; Example: '_mandos._tcp'.
126
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
127
 
    port: integer; what port to announce
128
 
    TXT: list of strings; TXT record for the service
129
 
    domain: string; Domain to publish on, default to .local if empty.
130
 
    host: string; Host to publish records for, default is localhost
131
 
    max_renames: integer; maximum number of renames
132
 
    rename_count: integer; counter so we only rename after collisions
133
 
                  a sensible number of times
134
 
    group: D-Bus Entry Group
135
 
    server: D-Bus Server
136
 
    bus: dbus.SystemBus()
137
 
    """
138
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
139
 
                 servicetype = None, port = None, TXT = None,
140
 
                 domain = "", host = "", max_renames = 32768,
141
 
                 protocol = avahi.PROTO_UNSPEC, bus = None):
142
 
        self.interface = interface
143
 
        self.name = name
144
 
        self.type = servicetype
145
 
        self.port = port
146
 
        self.TXT = TXT if TXT is not None else []
147
 
        self.domain = domain
148
 
        self.host = host
149
 
        self.rename_count = 0
150
 
        self.max_renames = max_renames
151
 
        self.protocol = protocol
152
 
        self.group = None       # our entry group
153
 
        self.server = None
154
 
        self.bus = bus
155
 
        self.entry_group_state_changed_match = None
156
 
    def rename(self):
157
 
        """Derived from the Avahi example code"""
158
 
        if self.rename_count >= self.max_renames:
159
 
            logger.critical("No suitable Zeroconf service name found"
160
 
                            " after %i retries, exiting.",
161
 
                            self.rename_count)
162
 
            raise AvahiServiceError("Too many renames")
163
 
        self.name = unicode(self.server.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))
170
 
        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)
177
 
        self.rename_count += 1
178
 
    def remove(self):
179
 
        """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()
185
 
    def add(self):
186
 
        """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
 
        
 
37
logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))
 
38
 
 
39
# This variable is used to optionally bind to a specified interface.
 
40
# It is a global variable to fit in with the other variables from the
 
41
# Avahi server example code.
 
42
serviceInterface = avahi.IF_UNSPEC
 
43
# From the Avahi server example code:
 
44
serviceName = "Mandos"
 
45
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
46
servicePort = None                      # Not known at startup
 
47
serviceTXT = []                         # TXT record for the service
 
48
domain = ""                  # Domain to publish on, default to .local
 
49
host = ""          # Host to publish records for, default to localhost
 
50
group = None #our entry group
 
51
rename_count = 12       # Counter so we only rename after collisions a
 
52
                        # sensible number of times
 
53
# End of Avahi example code
 
54
 
 
55
 
274
56
class Client(object):
275
57
    """A representation of a client host served by this server.
276
 
    
277
58
    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
 
59
    name:      string; from the config file, used in log messages
 
60
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
61
                 uniquely identify the client
 
62
    secret:    bytestring; sent verbatim (over TLS) to client
 
63
    fqdn:      string (FQDN); available for use by the checker command
 
64
    created:   datetime.datetime()
 
65
    last_seen: datetime.datetime() or None if not yet seen
 
66
    timeout:   datetime.timedelta(); How long from last_seen until
 
67
                                     this client is invalid
 
68
    interval:  datetime.timedelta(); How often to start a new checker
 
69
    stop_hook: If set, called by stop() as stop_hook(self)
 
70
    checker:   subprocess.Popen(); a running checker process used
 
71
                                   to see if the client lives.
 
72
                                   Is None if no process is running.
 
73
    checker_initiator_tag: a gobject event source tag, or None
 
74
    stop_initiator_tag:    - '' -
 
75
    checker_callback_tag:  - '' -
 
76
    checker_command: string; External command which is run to check if
 
77
                     client lives.  %()s expansions are done at
287
78
                     runtime with vars(self) as dict, so that for
288
79
                     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
 
80
    Private attibutes:
 
81
    _timeout: Real variable for 'timeout'
 
82
    _interval: Real variable for 'interval'
 
83
    _timeout_milliseconds: Used by gobject.timeout_add()
 
84
    _interval_milliseconds: - '' -
311
85
    """
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):
334
 
        """Note: the 'checker' key in 'config' sets the
335
 
        'checker_command' attribute and *not* the 'checker'
336
 
        attribute."""
 
86
    def _set_timeout(self, timeout):
 
87
        "Setter function for 'timeout' attribute"
 
88
        self._timeout = timeout
 
89
        self._timeout_milliseconds = ((self.timeout.days
 
90
                                       * 24 * 60 * 60 * 1000)
 
91
                                      + (self.timeout.seconds * 1000)
 
92
                                      + (self.timeout.microseconds
 
93
                                         // 1000))
 
94
    timeout = property(lambda self: self._timeout,
 
95
                       _set_timeout)
 
96
    del _set_timeout
 
97
    def _set_interval(self, interval):
 
98
        "Setter function for 'interval' attribute"
 
99
        self._interval = interval
 
100
        self._interval_milliseconds = ((self.interval.days
 
101
                                        * 24 * 60 * 60 * 1000)
 
102
                                       + (self.interval.seconds
 
103
                                          * 1000)
 
104
                                       + (self.interval.microseconds
 
105
                                          // 1000))
 
106
    interval = property(lambda self: self._interval,
 
107
                        _set_interval)
 
108
    del _set_interval
 
109
    def __init__(self, name=None, options=None, stop_hook=None,
 
110
                 fingerprint=None, secret=None, secfile=None, fqdn=None,
 
111
                 timeout=None, interval=-1, checker=None):
337
112
        self.name = name
338
 
        if config is None:
339
 
            config = {}
340
 
        logger.debug("Creating client %r", self.name)
341
 
        # Uppercase and remove spaces from fingerprint for later
342
 
        # comparison purposes with return value from the fingerprint()
343
 
        # function
344
 
        self.fingerprint = (config["fingerprint"].upper()
345
 
                            .replace(" ", ""))
346
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
347
 
        if "secret" in config:
348
 
            self.secret = config["secret"].decode("base64")
349
 
        elif "secfile" in config:
350
 
            with open(os.path.expanduser(os.path.expandvars
351
 
                                         (config["secfile"])),
352
 
                      "rb") as secfile:
353
 
                self.secret = secfile.read()
354
 
        else:
355
 
            raise TypeError("No secret or secfile for client %s"
356
 
                            % self.name)
357
 
        self.host = config.get("host", "")
358
 
        self.created = datetime.datetime.utcnow()
359
 
        self.enabled = False
360
 
        self.last_approval_request = None
361
 
        self.last_enabled = None
362
 
        self.last_checked_ok = None
363
 
        self.timeout = string_to_delta(config["timeout"])
364
 
        self.extended_timeout = string_to_delta(config["extended_timeout"])
365
 
        self.interval = string_to_delta(config["interval"])
366
 
        self.disable_hook = disable_hook
 
113
        # Uppercase and remove spaces from fingerprint
 
114
        # for later comparison purposes with return value of
 
115
        # the fingerprint() function
 
116
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
117
        if secret:
 
118
            self.secret = secret.decode(u"base64")
 
119
        elif secfile:
 
120
            sf = open(secfile)
 
121
            self.secret = sf.read()
 
122
            sf.close()
 
123
        else:
 
124
            raise RuntimeError(u"No secret or secfile for client %s"
 
125
                               % self.name)
 
126
        self.fqdn = fqdn                # string
 
127
        self.created = datetime.datetime.now()
 
128
        self.last_seen = None
 
129
        if timeout is None:
 
130
            timeout = options.timeout
 
131
        self.timeout = timeout
 
132
        if interval == -1:
 
133
            interval = options.interval
 
134
        else:
 
135
            interval = string_to_delta(interval)
 
136
        self.interval = interval
 
137
        self.stop_hook = stop_hook
367
138
        self.checker = None
368
139
        self.checker_initiator_tag = None
369
 
        self.disable_initiator_tag = None
370
 
        self.expires = None
 
140
        self.stop_initiator_tag = None
371
141
        self.checker_callback_tag = None
372
 
        self.checker_command = config["checker"]
373
 
        self.current_checker_command = None
374
 
        self.last_connect = None
375
 
        self._approved = None
376
 
        self.approved_by_default = config.get("approved_by_default",
377
 
                                              True)
378
 
        self.approvals_pending = 0
379
 
        self.approval_delay = string_to_delta(
380
 
            config["approval_delay"])
381
 
        self.approval_duration = string_to_delta(
382
 
            config["approval_duration"])
383
 
        self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
384
 
    
385
 
    def send_changedstate(self):
386
 
        self.changedstate.acquire()
387
 
        self.changedstate.notify_all()
388
 
        self.changedstate.release()
389
 
        
390
 
    def enable(self):
391
 
        """Start this client's checker and timeout hooks"""
392
 
        if getattr(self, "enabled", False):
393
 
            # Already enabled
394
 
            return
395
 
        self.send_changedstate()
 
142
        self.check_command = checker
 
143
    def start(self):
 
144
        """Start this clients checker and timeout hooks"""
396
145
        # Schedule a new checker to be started an 'interval' from now,
397
146
        # 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()
 
147
        self.checker_initiator_tag = gobject.timeout_add\
 
148
                                     (self._interval_milliseconds,
 
149
                                      self.start_checker)
408
150
        # Also start a new checker *right now*.
409
151
        self.start_checker()
410
 
    
411
 
    def disable(self, quiet=True):
412
 
        """Disable this client."""
413
 
        if not getattr(self, "enabled", False):
414
 
            return False
415
 
        if not quiet:
416
 
            self.send_changedstate()
417
 
        if not quiet:
418
 
            logger.info("Disabling client %s", self.name)
419
 
        if getattr(self, "disable_initiator_tag", False):
420
 
            gobject.source_remove(self.disable_initiator_tag)
421
 
            self.disable_initiator_tag = None
422
 
        self.expires = None
423
 
        if getattr(self, "checker_initiator_tag", False):
 
152
        # Schedule a stop() when 'timeout' has passed
 
153
        self.stop_initiator_tag = gobject.timeout_add\
 
154
                                  (self._timeout_milliseconds,
 
155
                                   self.stop)
 
156
    def stop(self):
 
157
        """Stop this client.
 
158
        The possibility that this client might be restarted is left
 
159
        open, but not currently used."""
 
160
        logger.debug(u"Stopping client %s", self.name)
 
161
        self.secret = None
 
162
        if self.stop_initiator_tag:
 
163
            gobject.source_remove(self.stop_initiator_tag)
 
164
            self.stop_initiator_tag = None
 
165
        if self.checker_initiator_tag:
424
166
            gobject.source_remove(self.checker_initiator_tag)
425
167
            self.checker_initiator_tag = None
426
168
        self.stop_checker()
427
 
        if self.disable_hook:
428
 
            self.disable_hook(self)
429
 
        self.enabled = False
 
169
        if self.stop_hook:
 
170
            self.stop_hook(self)
430
171
        # Do not run this again if called by a gobject.timeout_add
431
172
        return False
432
 
    
433
173
    def __del__(self):
434
 
        self.disable_hook = None
435
 
        self.disable()
436
 
    
437
 
    def checker_callback(self, pid, condition, command):
 
174
        # Some code duplication here and in stop()
 
175
        if hasattr(self, "stop_initiator_tag") \
 
176
               and self.stop_initiator_tag:
 
177
            gobject.source_remove(self.stop_initiator_tag)
 
178
            self.stop_initiator_tag = None
 
179
        if hasattr(self, "checker_initiator_tag") \
 
180
               and self.checker_initiator_tag:
 
181
            gobject.source_remove(self.checker_initiator_tag)
 
182
            self.checker_initiator_tag = None
 
183
        self.stop_checker()
 
184
    def checker_callback(self, pid, condition):
438
185
        """The checker has completed, so take appropriate actions."""
439
 
        self.checker_callback_tag = None
440
 
        self.checker = None
441
 
        if os.WIFEXITED(condition):
442
 
            exitstatus = os.WEXITSTATUS(condition)
443
 
            if exitstatus == 0:
444
 
                logger.info("Checker for %(name)s succeeded",
445
 
                            vars(self))
446
 
                self.checked_ok()
447
 
            else:
448
 
                logger.info("Checker for %(name)s failed",
449
 
                            vars(self))
450
 
        else:
451
 
            logger.warning("Checker for %(name)s crashed?",
 
186
        now = datetime.datetime.now()
 
187
        if os.WIFEXITED(condition) \
 
188
               and (os.WEXITSTATUS(condition) == 0):
 
189
            logger.debug(u"Checker for %(name)s succeeded",
 
190
                         vars(self))
 
191
            self.last_seen = now
 
192
            gobject.source_remove(self.stop_initiator_tag)
 
193
            self.stop_initiator_tag = gobject.timeout_add\
 
194
                                      (self._timeout_milliseconds,
 
195
                                       self.stop)
 
196
        if not os.WIFEXITED(condition):
 
197
            logger.warning(u"Checker for %(name)s crashed?",
452
198
                           vars(self))
453
 
    
454
 
    def checked_ok(self, timeout=None):
455
 
        """Bump up the timeout for this client.
456
 
        
457
 
        This should only be called when the client has been seen,
458
 
        alive and well.
459
 
        """
460
 
        if timeout is None:
461
 
            timeout = self.timeout
462
 
        self.last_checked_ok = datetime.datetime.utcnow()
463
 
        gobject.source_remove(self.disable_initiator_tag)
464
 
        self.expires = datetime.datetime.utcnow() + timeout
465
 
        self.disable_initiator_tag = (gobject.timeout_add
466
 
                                      (_timedelta_to_milliseconds(timeout),
467
 
                                       self.disable))
468
 
    
469
 
    def need_approval(self):
470
 
        self.last_approval_request = datetime.datetime.utcnow()
471
 
    
 
199
        else:
 
200
            logger.debug(u"Checker for %(name)s failed",
 
201
                         vars(self))
 
202
            self.checker = None
 
203
        self.checker_callback_tag = None
472
204
    def start_checker(self):
473
205
        """Start a new checker subprocess if one is not running.
474
 
        
475
206
        If a checker already exists, leave it running and do
476
207
        nothing."""
477
 
        # The reason for not killing a running checker is that if we
478
 
        # did that, then if a checker (for some reason) started
479
 
        # running slowly and taking more than 'interval' time, the
480
 
        # client would inevitably timeout, since no checker would get
481
 
        # a chance to run to completion.  If we instead leave running
482
 
        # checkers alone, the checker would have to take more time
483
 
        # than 'timeout' for the client to be disabled, which is as it
484
 
        # should be.
485
 
        
486
 
        # If a checker exists, make sure it is not a zombie
487
 
        try:
488
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
489
 
        except (AttributeError, OSError) as error:
490
 
            if (isinstance(error, OSError)
491
 
                and error.errno != errno.ECHILD):
492
 
                raise error
493
 
        else:
494
 
            if pid:
495
 
                logger.warning("Checker was a zombie")
496
 
                gobject.source_remove(self.checker_callback_tag)
497
 
                self.checker_callback(pid, status,
498
 
                                      self.current_checker_command)
499
 
        # Start a new checker if needed
500
208
        if self.checker is None:
 
209
            logger.debug(u"Starting checker for %s",
 
210
                         self.name)
501
211
            try:
502
 
                # In case checker_command has exactly one % operator
503
 
                command = self.checker_command % self.host
 
212
                command = self.check_command % self.fqdn
504
213
            except TypeError:
505
 
                # Escape attributes for the shell
506
 
                escaped_attrs = dict(
507
 
                    (attr,
508
 
                     re.escape(unicode(str(getattr(self, attr, "")),
509
 
                                       errors=
510
 
                                       'replace')))
511
 
                    for attr in
512
 
                    self.runtime_expansions)
513
 
                
 
214
                escaped_attrs = dict((key, re.escape(str(val)))
 
215
                                     for key, val in
 
216
                                     vars(self).iteritems())
514
217
                try:
515
 
                    command = self.checker_command % escaped_attrs
516
 
                except TypeError as error:
517
 
                    logger.error('Could not format string "%s":'
518
 
                                 ' %s', self.checker_command, error)
 
218
                    command = self.check_command % escaped_attrs
 
219
                except TypeError, error:
 
220
                    logger.critical(u'Could not format string "%s": %s',
 
221
                                    self.check_command, error)
519
222
                    return True # Try again later
520
 
            self.current_checker_command = command
521
223
            try:
522
 
                logger.info("Starting checker %r for %s",
523
 
                            command, self.name)
524
 
                # We don't need to redirect stdout and stderr, since
525
 
                # in normal mode, that is already done by daemon(),
526
 
                # and in debug mode we don't want to.  (Stdin is
527
 
                # always replaced by /dev/null.)
528
 
                self.checker = subprocess.Popen(command,
529
 
                                                close_fds=True,
530
 
                                                shell=True, cwd="/")
531
 
                self.checker_callback_tag = (gobject.child_watch_add
532
 
                                             (self.checker.pid,
533
 
                                              self.checker_callback,
534
 
                                              data=command))
535
 
                # The checker may have completed before the gobject
536
 
                # watch was added.  Check for this.
537
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
538
 
                if pid:
539
 
                    gobject.source_remove(self.checker_callback_tag)
540
 
                    self.checker_callback(pid, status, command)
541
 
            except OSError as error:
542
 
                logger.error("Failed to start subprocess: %s",
 
224
                self.checker = subprocess.\
 
225
                               Popen(command,
 
226
                                     stdout=subprocess.PIPE,
 
227
                                     close_fds=True, shell=True,
 
228
                                     cwd="/")
 
229
                self.checker_callback_tag = gobject.\
 
230
                                            child_watch_add(self.checker.pid,
 
231
                                                            self.\
 
232
                                                            checker_callback)
 
233
            except subprocess.OSError, error:
 
234
                logger.error(u"Failed to start subprocess: %s",
543
235
                             error)
544
236
        # Re-run this periodically if run by gobject.timeout_add
545
237
        return True
546
 
    
547
238
    def stop_checker(self):
548
239
        """Force the checker process, if any, to stop."""
549
 
        if self.checker_callback_tag:
550
 
            gobject.source_remove(self.checker_callback_tag)
551
 
            self.checker_callback_tag = None
552
 
        if getattr(self, "checker", None) is None:
 
240
        if not hasattr(self, "checker") or self.checker is None:
553
241
            return
554
 
        logger.debug("Stopping checker for %(name)s", vars(self))
555
 
        try:
556
 
            os.kill(self.checker.pid, signal.SIGTERM)
557
 
            #time.sleep(0.5)
558
 
            #if self.checker.poll() is None:
559
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
560
 
        except OSError as error:
561
 
            if error.errno != errno.ESRCH: # No such process
562
 
                raise
563
 
        self.checker = None
564
 
 
565
 
 
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):
 
242
        gobject.source_remove(self.checker_callback_tag)
908
243
        self.checker_callback_tag = None
 
244
        os.kill(self.checker.pid, signal.SIGTERM)
 
245
        if self.checker.poll() is None:
 
246
            os.kill(self.checker.pid, signal.SIGKILL)
909
247
        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.
 
248
    def still_valid(self, now=None):
 
249
        """Has the timeout not yet passed for this client?"""
 
250
        if now is None:
 
251
            now = datetime.datetime.now()
 
252
        if self.last_seen is None:
 
253
            return now < (self.created + self.timeout)
 
254
        else:
 
255
            return now < (self.last_seen + self.timeout)
 
256
 
 
257
 
 
258
def peer_certificate(session):
 
259
    # If not an OpenPGP certificate...
 
260
    if gnutls.library.functions.gnutls_certificate_type_get\
 
261
            (session._c_object) \
 
262
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
263
        # ...do the normal thing
 
264
        return session.peer_certificate
 
265
    list_size = ctypes.c_uint()
 
266
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
267
        (session._c_object, ctypes.byref(list_size))
 
268
    if list_size.value == 0:
 
269
        return None
 
270
    cert = cert_list[0]
 
271
    return ctypes.string_at(cert.data, cert.size)
 
272
 
 
273
 
 
274
def fingerprint(openpgp):
 
275
    # New empty GnuTLS certificate
 
276
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
277
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
278
        (ctypes.byref(crt))
 
279
    # New GnuTLS "datum" with the OpenPGP public key
 
280
    datum = gnutls.library.types.gnutls_datum_t\
 
281
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
282
                     ctypes.POINTER(ctypes.c_ubyte)),
 
283
         ctypes.c_uint(len(openpgp)))
 
284
    # Import the OpenPGP public key into the certificate
 
285
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
286
        (crt,
 
287
         ctypes.byref(datum),
 
288
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
289
    # New buffer for the fingerprint
 
290
    buffer = ctypes.create_string_buffer(20)
 
291
    buffer_length = ctypes.c_size_t()
 
292
    # Get the fingerprint from the certificate into the buffer
 
293
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
294
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
295
    # Deinit the certificate
 
296
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
297
    # Convert the buffer to a Python bytestring
 
298
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
299
    # Convert the bytestring to hexadecimal notation
 
300
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
301
    return hex_fpr
 
302
 
 
303
 
 
304
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
305
    """A TCP request handler class.
 
306
    Instantiated by IPv6_TCPServer for each request to handle it.
1236
307
    Note: This will run in its own forked process."""
1237
308
    
1238
309
    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
 
    
 
310
        logger.debug(u"TCP connection from: %s",
 
311
                     unicode(self.client_address))
 
312
        session = gnutls.connection.ClientSession(self.request,
 
313
                                                  gnutls.connection.\
 
314
                                                  X509Credentials())
 
315
        
 
316
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
317
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
318
        #                "+DHE-DSS"))
 
319
        priority = "SECURE256"
 
320
        
 
321
        gnutls.library.functions.gnutls_priority_set_direct\
 
322
            (session._c_object, priority, None);
 
323
        
 
324
        try:
 
325
            session.handshake()
 
326
        except gnutls.errors.GNUTLSError, error:
 
327
            logger.debug(u"Handshake failed: %s", error)
 
328
            # Do not run session.bye() here: the session is not
 
329
            # established.  Just abandon the request.
 
330
            return
 
331
        try:
 
332
            fpr = fingerprint(peer_certificate(session))
 
333
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
334
            logger.debug(u"Bad certificate: %s", error)
 
335
            session.bye()
 
336
            return
 
337
        logger.debug(u"Fingerprint: %s", fpr)
 
338
        client = None
 
339
        for c in clients:
 
340
            if c.fingerprint == fpr:
 
341
                client = c
 
342
                break
 
343
        # Have to check if client.still_valid(), since it is possible
 
344
        # that the client timed out while establishing the GnuTLS
 
345
        # session.
 
346
        if (not client) or (not client.still_valid()):
 
347
            if client:
 
348
                logger.debug(u"Client %(name)s is invalid",
 
349
                             vars(client))
 
350
            else:
 
351
                logger.debug(u"Client not found for fingerprint: %s",
 
352
                             fpr)
 
353
            session.bye()
 
354
            return
 
355
        sent_size = 0
 
356
        while sent_size < len(client.secret):
 
357
            sent = session.send(client.secret[sent_size:])
 
358
            logger.debug(u"Sent: %d, remaining: %d",
 
359
                         sent, len(client.secret)
 
360
                         - (sent_size + sent))
 
361
            sent_size += sent
 
362
        session.bye()
 
363
 
 
364
 
 
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
366
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
1488
367
    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
 
368
        options:        Command line options
 
369
        clients:        Set() of Client objects
1492
370
    """
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)
 
371
    address_family = socket.AF_INET6
 
372
    def __init__(self, *args, **kwargs):
 
373
        if "options" in kwargs:
 
374
            self.options = kwargs["options"]
 
375
            del kwargs["options"]
 
376
        if "clients" in kwargs:
 
377
            self.clients = kwargs["clients"]
 
378
            del kwargs["clients"]
 
379
        return super(type(self), self).__init__(*args, **kwargs)
1500
380
    def server_bind(self):
1501
381
        """This overrides the normal server_bind() function
1502
382
        to bind to an interface if one was specified, and also NOT to
1503
383
        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
 
384
        if self.options.interface:
 
385
            if not hasattr(socket, "SO_BINDTODEVICE"):
 
386
                # From /usr/include/asm-i486/socket.h
 
387
                socket.SO_BINDTODEVICE = 25
 
388
            try:
 
389
                self.socket.setsockopt(socket.SOL_SOCKET,
 
390
                                       socket.SO_BINDTODEVICE,
 
391
                                       self.options.interface)
 
392
            except socket.error, error:
 
393
                if error[0] == errno.EPERM:
 
394
                    logger.warning(u"No permission to"
 
395
                                   u" bind to interface %s",
 
396
                                   self.options.interface)
 
397
                else:
 
398
                    raise error
1526
399
        # Only bind(2) the socket if we really need to.
1527
400
        if self.server_address[0] or self.server_address[1]:
1528
401
            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,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
1534
404
                                       self.server_address[1])
1535
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
1536
406
                self.server_address = (self.server_address[0],
1537
407
                                       0)
1538
 
#                 if self.interface:
1539
 
#                     self.server_address = (self.server_address[0],
1540
 
#                                            0, # port
1541
 
#                                            0, # flowinfo
1542
 
#                                            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
 
408
            return super(type(self), self).server_bind()
1651
409
 
1652
410
 
1653
411
def string_to_delta(interval):
1654
412
    """Parse a string and return a datetime.timedelta
1655
 
    
 
413
 
1656
414
    >>> string_to_delta('7d')
1657
415
    datetime.timedelta(7)
1658
416
    >>> string_to_delta('60s')
1661
419
    datetime.timedelta(0, 3600)
1662
420
    >>> string_to_delta('24h')
1663
421
    datetime.timedelta(1)
1664
 
    >>> string_to_delta('1w')
 
422
    >>> string_to_delta(u'1w')
1665
423
    datetime.timedelta(7)
1666
 
    >>> string_to_delta('5m 30s')
1667
 
    datetime.timedelta(0, 330)
1668
424
    """
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
 
425
    try:
 
426
        suffix=unicode(interval[-1])
 
427
        value=int(interval[:-1])
 
428
        if suffix == u"d":
 
429
            delta = datetime.timedelta(value)
 
430
        elif suffix == u"s":
 
431
            delta = datetime.timedelta(0, value)
 
432
        elif suffix == u"m":
 
433
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
434
        elif suffix == u"h":
 
435
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
436
        elif suffix == u"w":
 
437
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
438
        else:
 
439
            raise ValueError
 
440
    except (ValueError, IndexError):
 
441
        raise ValueError
 
442
    return delta
 
443
 
 
444
 
 
445
def add_service():
 
446
    """From the Avahi server example code"""
 
447
    global group, serviceName, serviceType, servicePort, serviceTXT, \
 
448
           domain, host
 
449
    if group is None:
 
450
        group = dbus.Interface(
 
451
                bus.get_object( avahi.DBUS_NAME,
 
452
                                server.EntryGroupNew()),
 
453
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
454
        group.connect_to_signal('StateChanged',
 
455
                                entry_group_state_changed)
 
456
    logger.debug(u"Adding service '%s' of type '%s' ...",
 
457
                 serviceName, serviceType)
 
458
    
 
459
    group.AddService(
 
460
            serviceInterface,           # interface
 
461
            avahi.PROTO_INET6,          # protocol
 
462
            dbus.UInt32(0),             # flags
 
463
            serviceName, serviceType,
 
464
            domain, host,
 
465
            dbus.UInt16(servicePort),
 
466
            avahi.string_array_to_txt_array(serviceTXT))
 
467
    group.Commit()
 
468
 
 
469
 
 
470
def remove_service():
 
471
    """From the Avahi server example code"""
 
472
    global group
 
473
    
 
474
    if not group is None:
 
475
        group.Reset()
 
476
 
 
477
 
 
478
def server_state_changed(state):
 
479
    """From the Avahi server example code"""
 
480
    if state == avahi.SERVER_COLLISION:
 
481
        logger.warning(u"Server name collision")
 
482
        remove_service()
 
483
    elif state == avahi.SERVER_RUNNING:
 
484
        add_service()
 
485
 
 
486
 
 
487
def entry_group_state_changed(state, error):
 
488
    """From the Avahi server example code"""
 
489
    global serviceName, server, rename_count
 
490
    
 
491
    logger.debug(u"state change: %i", state)
 
492
    
 
493
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
494
        logger.debug(u"Service established.")
 
495
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
496
        
 
497
        rename_count = rename_count - 1
 
498
        if rename_count > 0:
 
499
            name = server.GetAlternativeServiceName(name)
 
500
            logger.warning(u"Service name collision, "
 
501
                           u"changing name to '%s' ...", name)
 
502
            remove_service()
 
503
            add_service()
 
504
            
 
505
        else:
 
506
            logger.error(u"No suitable service name found "
 
507
                         u"after %i retries, exiting.",
 
508
                         n_rename)
 
509
            main_loop.quit()
 
510
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
511
        logger.error(u"Error in group state changed %s",
 
512
                     unicode(error))
 
513
        main_loop.quit()
 
514
        return
1690
515
 
1691
516
 
1692
517
def if_nametoindex(interface):
1693
 
    """Call the C function if_nametoindex(), or equivalent
1694
 
    
1695
 
    Note: This function cannot accept a unicode string."""
1696
 
    global if_nametoindex
 
518
    """Call the C function if_nametoindex()"""
1697
519
    try:
1698
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1699
 
                          (ctypes.util.find_library("c"))
1700
 
                          .if_nametoindex)
 
520
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
521
        return libc.if_nametoindex(interface)
1701
522
    except (OSError, AttributeError):
1702
 
        logger.warning("Doing if_nametoindex the hard way")
1703
 
        def if_nametoindex(interface):
1704
 
            "Get an interface index the hard way, i.e. using fcntl()"
1705
 
            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]
1712
 
            return interface_index
1713
 
    return if_nametoindex(interface)
1714
 
 
1715
 
 
1716
 
def daemon(nochdir = False, noclose = False):
1717
 
    """See daemon(3).  Standard BSD Unix function.
1718
 
    
1719
 
    This should really exist as os.daemon, but it doesn't (yet)."""
1720
 
    if os.fork():
1721
 
        sys.exit()
1722
 
    os.setsid()
1723
 
    if not nochdir:
1724
 
        os.chdir("/")
1725
 
    if os.fork():
1726
 
        sys.exit()
1727
 
    if not noclose:
1728
 
        # Close all standard open file descriptors
1729
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1730
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1731
 
            raise OSError(errno.ENODEV,
1732
 
                          "%s not a character device"
1733
 
                          % os.path.devnull)
1734
 
        os.dup2(null, sys.stdin.fileno())
1735
 
        os.dup2(null, sys.stdout.fileno())
1736
 
        os.dup2(null, sys.stderr.fileno())
1737
 
        if null > 2:
1738
 
            os.close(null)
1739
 
 
1740
 
 
1741
 
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()
 
523
        if "struct" not in sys.modules:
 
524
            import struct
 
525
        if "fcntl" not in sys.modules:
 
526
            import fcntl
 
527
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
528
        s = socket.socket()
 
529
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
530
                            struct.pack("16s16x", interface))
 
531
        s.close()
 
532
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
533
        return interface_index
 
534
 
 
535
 
 
536
if __name__ == '__main__':
 
537
    parser = OptionParser()
 
538
    parser.add_option("-i", "--interface", type="string",
 
539
                      default=None, metavar="IF",
 
540
                      help="Bind to interface IF")
 
541
    parser.add_option("--cert", type="string", default="cert.pem",
 
542
                      metavar="FILE",
 
543
                      help="Public key certificate PEM file to use")
 
544
    parser.add_option("--key", type="string", default="key.pem",
 
545
                      metavar="FILE",
 
546
                      help="Private key PEM file to use")
 
547
    parser.add_option("--ca", type="string", default="ca.pem",
 
548
                      metavar="FILE",
 
549
                      help="Certificate Authority certificate PEM file to use")
 
550
    parser.add_option("--crl", type="string", default="crl.pem",
 
551
                      metavar="FILE",
 
552
                      help="Certificate Revokation List PEM file to use")
 
553
    parser.add_option("-p", "--port", type="int", default=None,
 
554
                      help="Port number to receive requests on")
 
555
    parser.add_option("--timeout", type="string", # Parsed later
 
556
                      default="1h",
 
557
                      help="Amount of downtime allowed for clients")
 
558
    parser.add_option("--interval", type="string", # Parsed later
 
559
                      default="5m",
 
560
                      help="How often to check that a client is up")
 
561
    parser.add_option("--check", action="store_true", default=False,
 
562
                      help="Run self-test")
 
563
    parser.add_option("--debug", action="store_true", default=False,
 
564
                      help="Debug mode")
 
565
    (options, args) = parser.parse_args()
1777
566
    
1778
567
    if options.check:
1779
568
        import doctest
1780
569
        doctest.testmod()
1781
570
        sys.exit()
1782
571
    
1783
 
    # Default values for config file for server-global settings
1784
 
    server_defaults = { "interface": "",
1785
 
                        "address": "",
1786
 
                        "port": "",
1787
 
                        "debug": "False",
1788
 
                        "priority":
1789
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1790
 
                        "servicename": "Mandos",
1791
 
                        "use_dbus": "True",
1792
 
                        "use_ipv6": "True",
1793
 
                        "debuglevel": "",
1794
 
                        }
1795
 
    
1796
 
    # Parse config file for server-global settings
1797
 
    server_config = configparser.SafeConfigParser(server_defaults)
1798
 
    del server_defaults
1799
 
    server_config.read(os.path.join(options.configdir,
1800
 
                                    "mandos.conf"))
1801
 
    # 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")
1810
 
    del server_config
1811
 
    
1812
 
    # Override the settings from the config file with command line
1813
 
    # options, if set.
1814
 
    for option in ("interface", "address", "port", "debug",
1815
 
                   "priority", "servicename", "configdir",
1816
 
                   "use_dbus", "use_ipv6", "debuglevel"):
1817
 
        value = getattr(options, option)
1818
 
        if value is not None:
1819
 
            server_settings[option] = value
1820
 
    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
 
    # Now we have our good server settings in "server_settings"
1826
 
    
1827
 
    ##################################################################
1828
 
    
1829
 
    # For convenience
1830
 
    debug = server_settings["debug"]
1831
 
    debuglevel = server_settings["debuglevel"]
1832
 
    use_dbus = server_settings["use_dbus"]
1833
 
    use_ipv6 = server_settings["use_ipv6"]
1834
 
    
1835
 
    if server_settings["servicename"] != "Mandos":
1836
 
        syslogger.setFormatter(logging.Formatter
1837
 
                               ('Mandos (%s) [%%(process)d]:'
1838
 
                                ' %%(levelname)s: %%(message)s'
1839
 
                                % server_settings["servicename"]))
1840
 
    
1841
 
    # Parse config file with clients
1842
 
    client_defaults = { "timeout": "5m",
1843
 
                        "extended_timeout": "15m",
1844
 
                        "interval": "2m",
1845
 
                        "checker": "fping -q -- %%(host)s",
1846
 
                        "host": "",
1847
 
                        "approval_delay": "0s",
1848
 
                        "approval_duration": "1s",
1849
 
                        }
1850
 
    client_config = configparser.SafeConfigParser(client_defaults)
1851
 
    client_config.read(os.path.join(server_settings["configdir"],
1852
 
                                    "clients.conf"))
1853
 
    
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()
1929
 
    
1930
 
    global main_loop
1931
 
    # From the Avahi example code
 
572
    # Parse the time arguments
 
573
    try:
 
574
        options.timeout = string_to_delta(options.timeout)
 
575
    except ValueError:
 
576
        parser.error("option --timeout: Unparseable time")
 
577
    try:
 
578
        options.interval = string_to_delta(options.interval)
 
579
    except ValueError:
 
580
        parser.error("option --interval: Unparseable time")
 
581
    
 
582
    # Parse config file
 
583
    defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
 
584
    client_config = ConfigParser.SafeConfigParser(defaults)
 
585
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
 
586
    client_config.read("mandos-clients.conf")
 
587
    
 
588
    # From the Avahi server example code
1932
589
    DBusGMainLoop(set_as_default=True )
1933
590
    main_loop = gobject.MainLoop()
1934
591
    bus = dbus.SystemBus()
1935
 
    # 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
 
        
1995
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1996
 
    
1997
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1998
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1999
 
    
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
 
    
2084
 
    # Find out what port we got
2085
 
    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())
2093
 
    
2094
 
    #service.interface = tcp_server.socket.getsockname()[3]
2095
 
    
 
592
    server = dbus.Interface(
 
593
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
594
            avahi.DBUS_INTERFACE_SERVER )
 
595
    # End of Avahi example code
 
596
    
 
597
    debug = options.debug
 
598
    
 
599
    clients = Set()
 
600
    def remove_from_clients(client):
 
601
        clients.remove(client)
 
602
        if not clients:
 
603
            logger.debug(u"No clients left, exiting")
 
604
            main_loop.quit()
 
605
    
 
606
    clients.update(Set(Client(name=section, options=options,
 
607
                              stop_hook = remove_from_clients,
 
608
                              **(dict(client_config\
 
609
                                      .items(section))))
 
610
                       for section in client_config.sections()))
 
611
    for client in clients:
 
612
        client.start()
 
613
    
 
614
    tcp_server = IPv6_TCPServer((None, options.port),
 
615
                                tcp_handler,
 
616
                                options=options,
 
617
                                clients=clients)
 
618
    # Find out what random port we got
 
619
    servicePort = tcp_server.socket.getsockname()[1]
 
620
    logger.debug(u"Now listening on port %d", servicePort)
 
621
    
 
622
    if options.interface is not None:
 
623
        serviceInterface = if_nametoindex(options.interface)
 
624
    
 
625
    # From the Avahi server example code
 
626
    server.connect_to_signal("StateChanged", server_state_changed)
 
627
    server_state_changed(server.GetState())
 
628
    # End of Avahi example code
 
629
    
 
630
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
631
                         lambda *args, **kwargs:
 
632
                         tcp_server.handle_request(*args[2:],
 
633
                                                   **kwargs) or True)
2096
634
    try:
2097
 
        # From the Avahi example code
2098
 
        try:
2099
 
            service.activate()
2100
 
        except dbus.exceptions.DBusException as error:
2101
 
            logger.critical("DBusException: %s", error)
2102
 
            cleanup()
2103
 
            sys.exit(1)
2104
 
        # End of Avahi example code
2105
 
        
2106
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2107
 
                             lambda *args, **kwargs:
2108
 
                             (tcp_server.handle_request
2109
 
                              (*args[2:], **kwargs) or True))
2110
 
        
2111
 
        logger.debug("Starting main loop")
2112
635
        main_loop.run()
2113
 
    except AvahiError as error:
2114
 
        logger.critical("AvahiError: %s", error)
2115
 
        cleanup()
2116
 
        sys.exit(1)
2117
636
    except KeyboardInterrupt:
2118
 
        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
 
 
2125
 
 
2126
 
if __name__ == '__main__':
2127
 
    main()
 
637
        print
 
638
    
 
639
    # Cleanup here
 
640
 
 
641
    # From the Avahi server example code
 
642
    if not group is None:
 
643
        group.Free()
 
644
    # End of Avahi example code
 
645
    
 
646
    for client in clients:
 
647
        client.stop_hook = None
 
648
        client.stop()