/mandos/release

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

« 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 © 2008,2009 Teddy Hogeborn
15
 
# Copyright © 2008,2009 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, with_statement, absolute_import
35
 
 
36
 
import SocketServer as socketserver
 
2
 
 
3
from __future__ import division
 
4
 
 
5
import SocketServer
37
6
import socket
38
 
import optparse
 
7
import select
 
8
from optparse import OptionParser
39
9
import datetime
40
10
import errno
41
11
import gnutls.crypto
44
14
import gnutls.library.functions
45
15
import gnutls.library.constants
46
16
import gnutls.library.types
47
 
import ConfigParser as configparser
 
17
import ConfigParser
48
18
import sys
49
19
import re
50
20
import os
51
21
import signal
 
22
from sets import Set
52
23
import subprocess
53
 
import atexit
54
 
import stat
55
 
import logging
56
 
import logging.handlers
57
 
import pwd
58
 
import contextlib
59
 
import struct
60
 
import fcntl
61
 
import functools
62
 
import cPickle as pickle
63
 
import multiprocessing
64
24
 
65
25
import dbus
66
 
import dbus.service
67
26
import gobject
68
27
import avahi
69
28
from dbus.mainloop.glib import DBusGMainLoop
70
29
import ctypes
71
 
import ctypes.util
72
 
import xml.dom.minidom
73
 
import inspect
74
 
 
75
 
try:
76
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
77
 
except AttributeError:
78
 
    try:
79
 
        from IN import SO_BINDTODEVICE
80
 
    except ImportError:
81
 
        SO_BINDTODEVICE = None
82
 
 
83
 
 
84
 
version = "1.0.14"
85
 
 
86
 
#logger = logging.getLogger(u'mandos')
87
 
logger = logging.Logger(u'mandos')
88
 
syslogger = (logging.handlers.SysLogHandler
89
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
90
 
              address = "/dev/log"))
91
 
syslogger.setFormatter(logging.Formatter
92
 
                       (u'Mandos [%(process)d]: %(levelname)s:'
93
 
                        u' %(message)s'))
94
 
logger.addHandler(syslogger)
95
 
 
96
 
console = logging.StreamHandler()
97
 
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
98
 
                                       u' %(levelname)s:'
99
 
                                       u' %(message)s'))
100
 
logger.addHandler(console)
101
 
 
102
 
class AvahiError(Exception):
103
 
    def __init__(self, value, *args, **kwargs):
104
 
        self.value = value
105
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
106
 
    def __unicode__(self):
107
 
        return unicode(repr(self.value))
108
 
 
109
 
class AvahiServiceError(AvahiError):
110
 
    pass
111
 
 
112
 
class AvahiGroupError(AvahiError):
113
 
    pass
114
 
 
115
 
 
116
 
class AvahiService(object):
117
 
    """An Avahi (Zeroconf) service.
118
 
    
119
 
    Attributes:
120
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
121
 
               Used to optionally bind to the specified interface.
122
 
    name: string; Example: u'Mandos'
123
 
    type: string; Example: u'_mandos._tcp'.
124
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
125
 
    port: integer; what port to announce
126
 
    TXT: list of strings; TXT record for the service
127
 
    domain: string; Domain to publish on, default to .local if empty.
128
 
    host: string; Host to publish records for, default is localhost
129
 
    max_renames: integer; maximum number of renames
130
 
    rename_count: integer; counter so we only rename after collisions
131
 
                  a sensible number of times
132
 
    group: D-Bus Entry Group
133
 
    server: D-Bus Server
134
 
    bus: dbus.SystemBus()
135
 
    """
136
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
137
 
                 servicetype = None, port = None, TXT = None,
138
 
                 domain = u"", host = u"", max_renames = 32768,
139
 
                 protocol = avahi.PROTO_UNSPEC, bus = None):
140
 
        self.interface = interface
141
 
        self.name = name
142
 
        self.type = servicetype
143
 
        self.port = port
144
 
        self.TXT = TXT if TXT is not None else []
145
 
        self.domain = domain
146
 
        self.host = host
147
 
        self.rename_count = 0
148
 
        self.max_renames = max_renames
149
 
        self.protocol = protocol
150
 
        self.group = None       # our entry group
151
 
        self.server = None
152
 
        self.bus = bus
153
 
    def rename(self):
154
 
        """Derived from the Avahi example code"""
155
 
        if self.rename_count >= self.max_renames:
156
 
            logger.critical(u"No suitable Zeroconf service name found"
157
 
                            u" after %i retries, exiting.",
158
 
                            self.rename_count)
159
 
            raise AvahiServiceError(u"Too many renames")
160
 
        self.name = self.server.GetAlternativeServiceName(self.name)
161
 
        logger.info(u"Changing Zeroconf service name to %r ...",
162
 
                    unicode(self.name))
163
 
        syslogger.setFormatter(logging.Formatter
164
 
                               (u'Mandos (%s) [%%(process)d]:'
165
 
                                u' %%(levelname)s: %%(message)s'
166
 
                                % self.name))
167
 
        self.remove()
168
 
        self.add()
169
 
        self.rename_count += 1
170
 
    def remove(self):
171
 
        """Derived from the Avahi example code"""
172
 
        if self.group is not None:
173
 
            self.group.Reset()
174
 
    def add(self):
175
 
        """Derived from the Avahi example code"""
176
 
        if self.group is None:
177
 
            self.group = dbus.Interface(
178
 
                self.bus.get_object(avahi.DBUS_NAME,
179
 
                                    self.server.EntryGroupNew()),
180
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
181
 
            self.group.connect_to_signal('StateChanged',
182
 
                                         self
183
 
                                         .entry_group_state_changed)
184
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
185
 
                     self.name, self.type)
186
 
        self.group.AddService(
187
 
            self.interface,
188
 
            self.protocol,
189
 
            dbus.UInt32(0),     # flags
190
 
            self.name, self.type,
191
 
            self.domain, self.host,
192
 
            dbus.UInt16(self.port),
193
 
            avahi.string_array_to_txt_array(self.TXT))
194
 
        self.group.Commit()
195
 
    def entry_group_state_changed(self, state, error):
196
 
        """Derived from the Avahi example code"""
197
 
        logger.debug(u"Avahi state change: %i", state)
198
 
        
199
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
200
 
            logger.debug(u"Zeroconf service established.")
201
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
202
 
            logger.warning(u"Zeroconf service name collision.")
203
 
            self.rename()
204
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
205
 
            logger.critical(u"Avahi: Error in group state changed %s",
206
 
                            unicode(error))
207
 
            raise AvahiGroupError(u"State changed: %s"
208
 
                                  % unicode(error))
209
 
    def cleanup(self):
210
 
        """Derived from the Avahi example code"""
211
 
        if self.group is not None:
212
 
            self.group.Free()
213
 
            self.group = None
214
 
    def server_state_changed(self, state):
215
 
        """Derived from the Avahi example code"""
216
 
        if state == avahi.SERVER_COLLISION:
217
 
            logger.error(u"Zeroconf server name collision")
218
 
            self.remove()
219
 
        elif state == avahi.SERVER_RUNNING:
220
 
            self.add()
221
 
    def activate(self):
222
 
        """Derived from the Avahi example code"""
223
 
        if self.server is None:
224
 
            self.server = dbus.Interface(
225
 
                self.bus.get_object(avahi.DBUS_NAME,
226
 
                                    avahi.DBUS_PATH_SERVER),
227
 
                avahi.DBUS_INTERFACE_SERVER)
228
 
        self.server.connect_to_signal(u"StateChanged",
229
 
                                 self.server_state_changed)
230
 
        self.server_state_changed(self.server.GetState())
 
30
 
 
31
import logging
 
32
import logging.handlers
 
33
 
 
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
 
35
 
 
36
logger = logging.Logger('mandos')
 
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
231
54
 
232
55
 
233
56
class Client(object):
234
57
    """A representation of a client host served by this server.
235
 
    
236
58
    Attributes:
237
 
    name:       string; from the config file, used in log messages and
238
 
                        D-Bus identifiers
 
59
    name:      string; from the config file, used in log messages
239
60
    fingerprint: string (40 or 32 hexadecimal digits); used to
240
61
                 uniquely identify the client
241
 
    secret:     bytestring; sent verbatim (over TLS) to client
242
 
    host:       string; available for use by the checker command
243
 
    created:    datetime.datetime(); (UTC) object creation
244
 
    last_enabled: datetime.datetime(); (UTC)
245
 
    enabled:    bool()
246
 
    last_checked_ok: datetime.datetime(); (UTC) or None
247
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
248
 
                                      until this client is disabled
249
 
    interval:   datetime.timedelta(); How often to start a new checker
250
 
    disable_hook:  If set, called by disable() as disable_hook(self)
251
 
    checker:    subprocess.Popen(); a running checker process used
252
 
                                    to see if the client lives.
253
 
                                    'None' if no process is running.
 
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.
254
73
    checker_initiator_tag: a gobject event source tag, or None
255
 
    disable_initiator_tag: - '' -
 
74
    stop_initiator_tag:    - '' -
256
75
    checker_callback_tag:  - '' -
257
76
    checker_command: string; External command which is run to check if
258
 
                     client lives.  %() expansions are done at
 
77
                     client lives.  %()s expansions are done at
259
78
                     runtime with vars(self) as dict, so that for
260
79
                     instance %(name)s can be used in the command.
261
 
    current_checker_command: string; current running checker_command
262
 
    approved_delay: datetime.timedelta(); Time to wait for approval
263
 
    _approved:   bool(); 'None' if not yet approved/disapproved
264
 
    approved_duration: datetime.timedelta(); Duration of one approval
 
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: - '' -
265
85
    """
266
 
    
267
 
    @staticmethod
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
 
    
274
 
    def timeout_milliseconds(self):
275
 
        "Return the 'timeout' attribute in milliseconds"
276
 
        return self._timedelta_to_milliseconds(self.timeout)
277
 
    
278
 
    def interval_milliseconds(self):
279
 
        "Return the 'interval' attribute in milliseconds"
280
 
        return self._timedelta_to_milliseconds(self.interval)
281
 
 
282
 
    def approved_delay_milliseconds(self):
283
 
        return self._timedelta_to_milliseconds(self.approved_delay)
284
 
    
285
 
    def __init__(self, name = None, disable_hook=None, config=None):
286
 
        """Note: the 'checker' key in 'config' sets the
287
 
        'checker_command' attribute and *not* the 'checker'
288
 
        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):
289
112
        self.name = name
290
 
        if config is None:
291
 
            config = {}
292
 
        logger.debug(u"Creating client %r", self.name)
293
 
        # Uppercase and remove spaces from fingerprint for later
294
 
        # comparison purposes with return value from the fingerprint()
295
 
        # function
296
 
        self.fingerprint = (config[u"fingerprint"].upper()
297
 
                            .replace(u" ", u""))
298
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
299
 
        if u"secret" in config:
300
 
            self.secret = config[u"secret"].decode(u"base64")
301
 
        elif u"secfile" in config:
302
 
            with open(os.path.expanduser(os.path.expandvars
303
 
                                         (config[u"secfile"])),
304
 
                      "rb") as secfile:
305
 
                self.secret = secfile.read()
306
 
        else:
307
 
            #XXX Need to allow secret on demand!
308
 
            raise TypeError(u"No secret or secfile for client %s"
309
 
                            % self.name)
310
 
        self.host = config.get(u"host", u"")
311
 
        self.created = datetime.datetime.utcnow()
312
 
        self.enabled = False
313
 
        self.last_enabled = None
314
 
        self.last_checked_ok = None
315
 
        self.timeout = string_to_delta(config[u"timeout"])
316
 
        self.interval = string_to_delta(config[u"interval"])
317
 
        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
318
138
        self.checker = None
319
139
        self.checker_initiator_tag = None
320
 
        self.disable_initiator_tag = None
 
140
        self.stop_initiator_tag = None
321
141
        self.checker_callback_tag = None
322
 
        self.checker_command = config[u"checker"]
323
 
        self.current_checker_command = None
324
 
        self.last_connect = None
325
 
        self._approved = None
326
 
        self.approved_by_default = config.get(u"approved_by_default",
327
 
                                              True)
328
 
        self.approvals_pending = 0
329
 
        self.approved_delay = string_to_delta(
330
 
            config[u"approved_delay"])
331
 
        self.approved_duration = string_to_delta(
332
 
            config[u"approved_duration"])
333
 
        self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
334
 
    
335
 
    def send_changedstate(self):
336
 
        self.changedstate.acquire()
337
 
        self.changedstate.notify_all()
338
 
        self.changedstate.release()
339
 
        
340
 
    def enable(self):
341
 
        """Start this client's checker and timeout hooks"""
342
 
        if getattr(self, u"enabled", False):
343
 
            # Already enabled
344
 
            return
345
 
        self.send_changedstate()
346
 
        self.last_enabled = datetime.datetime.utcnow()
 
142
        self.check_command = checker
 
143
    def start(self):
 
144
        """Start this clients checker and timeout hooks"""
347
145
        # Schedule a new checker to be started an 'interval' from now,
348
146
        # and every interval from then on.
349
 
        self.checker_initiator_tag = (gobject.timeout_add
350
 
                                      (self.interval_milliseconds(),
351
 
                                       self.start_checker))
352
 
        # Schedule a disable() when 'timeout' has passed
353
 
        self.disable_initiator_tag = (gobject.timeout_add
354
 
                                   (self.timeout_milliseconds(),
355
 
                                    self.disable))
356
 
        self.enabled = True
 
147
        self.checker_initiator_tag = gobject.timeout_add\
 
148
                                     (self._interval_milliseconds,
 
149
                                      self.start_checker)
357
150
        # Also start a new checker *right now*.
358
151
        self.start_checker()
359
 
    
360
 
    def disable(self, quiet=True):
361
 
        """Disable this client."""
362
 
        if not getattr(self, "enabled", False):
363
 
            return False
364
 
        if not quiet:
365
 
            self.send_changedstate()
366
 
        if not quiet:
367
 
            logger.info(u"Disabling client %s", self.name)
368
 
        if getattr(self, u"disable_initiator_tag", False):
369
 
            gobject.source_remove(self.disable_initiator_tag)
370
 
            self.disable_initiator_tag = None
371
 
        if getattr(self, u"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:
372
166
            gobject.source_remove(self.checker_initiator_tag)
373
167
            self.checker_initiator_tag = None
374
168
        self.stop_checker()
375
 
        if self.disable_hook:
376
 
            self.disable_hook(self)
377
 
        self.enabled = False
 
169
        if self.stop_hook:
 
170
            self.stop_hook(self)
378
171
        # Do not run this again if called by a gobject.timeout_add
379
172
        return False
380
 
    
381
173
    def __del__(self):
382
 
        self.disable_hook = None
383
 
        self.disable()
384
 
    
385
 
    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):
386
185
        """The checker has completed, so take appropriate actions."""
387
 
        self.checker_callback_tag = None
388
 
        self.checker = None
389
 
        if os.WIFEXITED(condition):
390
 
            exitstatus = os.WEXITSTATUS(condition)
391
 
            if exitstatus == 0:
392
 
                logger.info(u"Checker for %(name)s succeeded",
393
 
                            vars(self))
394
 
                self.checked_ok()
395
 
            else:
396
 
                logger.info(u"Checker for %(name)s failed",
397
 
                            vars(self))
398
 
        else:
 
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):
399
197
            logger.warning(u"Checker for %(name)s crashed?",
400
198
                           vars(self))
401
 
    
402
 
    def checked_ok(self):
403
 
        """Bump up the timeout for this client.
404
 
        
405
 
        This should only be called when the client has been seen,
406
 
        alive and well.
407
 
        """
408
 
        self.last_checked_ok = datetime.datetime.utcnow()
409
 
        gobject.source_remove(self.disable_initiator_tag)
410
 
        self.disable_initiator_tag = (gobject.timeout_add
411
 
                                      (self.timeout_milliseconds(),
412
 
                                       self.disable))
413
 
    
 
199
        else:
 
200
            logger.debug(u"Checker for %(name)s failed",
 
201
                         vars(self))
 
202
            self.checker = None
 
203
        self.checker_callback_tag = None
414
204
    def start_checker(self):
415
205
        """Start a new checker subprocess if one is not running.
416
 
        
417
206
        If a checker already exists, leave it running and do
418
207
        nothing."""
419
 
        # The reason for not killing a running checker is that if we
420
 
        # did that, then if a checker (for some reason) started
421
 
        # running slowly and taking more than 'interval' time, the
422
 
        # client would inevitably timeout, since no checker would get
423
 
        # a chance to run to completion.  If we instead leave running
424
 
        # checkers alone, the checker would have to take more time
425
 
        # than 'timeout' for the client to be disabled, which is as it
426
 
        # should be.
427
 
        
428
 
        # If a checker exists, make sure it is not a zombie
429
 
        try:
430
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
431
 
        except (AttributeError, OSError), error:
432
 
            if (isinstance(error, OSError)
433
 
                and error.errno != errno.ECHILD):
434
 
                raise error
435
 
        else:
436
 
            if pid:
437
 
                logger.warning(u"Checker was a zombie")
438
 
                gobject.source_remove(self.checker_callback_tag)
439
 
                self.checker_callback(pid, status,
440
 
                                      self.current_checker_command)
441
 
        # Start a new checker if needed
442
208
        if self.checker is None:
 
209
            logger.debug(u"Starting checker for %s",
 
210
                         self.name)
443
211
            try:
444
 
                # In case checker_command has exactly one % operator
445
 
                command = self.checker_command % self.host
 
212
                command = self.check_command % self.fqdn
446
213
            except TypeError:
447
 
                # Escape attributes for the shell
448
 
                escaped_attrs = dict((key,
449
 
                                      re.escape(unicode(str(val),
450
 
                                                        errors=
451
 
                                                        u'replace')))
 
214
                escaped_attrs = dict((key, re.escape(str(val)))
452
215
                                     for key, val in
453
216
                                     vars(self).iteritems())
454
217
                try:
455
 
                    command = self.checker_command % escaped_attrs
 
218
                    command = self.check_command % escaped_attrs
456
219
                except TypeError, error:
457
 
                    logger.error(u'Could not format string "%s":'
458
 
                                 u' %s', self.checker_command, error)
 
220
                    logger.critical(u'Could not format string "%s": %s',
 
221
                                    self.check_command, error)
459
222
                    return True # Try again later
460
 
            self.current_checker_command = command
461
223
            try:
462
 
                logger.info(u"Starting checker %r for %s",
463
 
                            command, self.name)
464
 
                # We don't need to redirect stdout and stderr, since
465
 
                # in normal mode, that is already done by daemon(),
466
 
                # and in debug mode we don't want to.  (Stdin is
467
 
                # always replaced by /dev/null.)
468
 
                self.checker = subprocess.Popen(command,
469
 
                                                close_fds=True,
470
 
                                                shell=True, cwd=u"/")
471
 
                self.checker_callback_tag = (gobject.child_watch_add
472
 
                                             (self.checker.pid,
473
 
                                              self.checker_callback,
474
 
                                              data=command))
475
 
                # The checker may have completed before the gobject
476
 
                # watch was added.  Check for this.
477
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
478
 
                if pid:
479
 
                    gobject.source_remove(self.checker_callback_tag)
480
 
                    self.checker_callback(pid, status, command)
481
 
            except OSError, error:
 
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:
482
234
                logger.error(u"Failed to start subprocess: %s",
483
235
                             error)
484
236
        # Re-run this periodically if run by gobject.timeout_add
485
237
        return True
486
 
    
487
238
    def stop_checker(self):
488
239
        """Force the checker process, if any, to stop."""
489
 
        if self.checker_callback_tag:
490
 
            gobject.source_remove(self.checker_callback_tag)
491
 
            self.checker_callback_tag = None
492
 
        if getattr(self, u"checker", None) is None:
 
240
        if not hasattr(self, "checker") or self.checker is None:
493
241
            return
494
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
495
 
        try:
496
 
            os.kill(self.checker.pid, signal.SIGTERM)
497
 
            #time.sleep(0.5)
498
 
            #if self.checker.poll() is None:
499
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
500
 
        except OSError, error:
501
 
            if error.errno != errno.ESRCH: # No such process
502
 
                raise
503
 
        self.checker = None
504
 
 
505
 
def dbus_service_property(dbus_interface, signature=u"v",
506
 
                          access=u"readwrite", byte_arrays=False):
507
 
    """Decorators for marking methods of a DBusObjectWithProperties to
508
 
    become properties on the D-Bus.
509
 
    
510
 
    The decorated method will be called with no arguments by "Get"
511
 
    and with one argument by "Set".
512
 
    
513
 
    The parameters, where they are supported, are the same as
514
 
    dbus.service.method, except there is only "signature", since the
515
 
    type from Get() and the type sent to Set() is the same.
516
 
    """
517
 
    # Encoding deeply encoded byte arrays is not supported yet by the
518
 
    # "Set" method, so we fail early here:
519
 
    if byte_arrays and signature != u"ay":
520
 
        raise ValueError(u"Byte arrays not supported for non-'ay'"
521
 
                         u" signature %r" % signature)
522
 
    def decorator(func):
523
 
        func._dbus_is_property = True
524
 
        func._dbus_interface = dbus_interface
525
 
        func._dbus_signature = signature
526
 
        func._dbus_access = access
527
 
        func._dbus_name = func.__name__
528
 
        if func._dbus_name.endswith(u"_dbus_property"):
529
 
            func._dbus_name = func._dbus_name[:-14]
530
 
        func._dbus_get_args_options = {u'byte_arrays': byte_arrays }
531
 
        return func
532
 
    return decorator
533
 
 
534
 
 
535
 
class DBusPropertyException(dbus.exceptions.DBusException):
536
 
    """A base class for D-Bus property-related exceptions
537
 
    """
538
 
    def __unicode__(self):
539
 
        return unicode(str(self))
540
 
 
541
 
 
542
 
class DBusPropertyAccessException(DBusPropertyException):
543
 
    """A property's access permissions disallows an operation.
544
 
    """
545
 
    pass
546
 
 
547
 
 
548
 
class DBusPropertyNotFound(DBusPropertyException):
549
 
    """An attempt was made to access a non-existing property.
550
 
    """
551
 
    pass
552
 
 
553
 
 
554
 
class DBusObjectWithProperties(dbus.service.Object):
555
 
    """A D-Bus object with properties.
556
 
 
557
 
    Classes inheriting from this can use the dbus_service_property
558
 
    decorator to expose methods as D-Bus properties.  It exposes the
559
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
560
 
    """
561
 
    
562
 
    @staticmethod
563
 
    def _is_dbus_property(obj):
564
 
        return getattr(obj, u"_dbus_is_property", False)
565
 
    
566
 
    def _get_all_dbus_properties(self):
567
 
        """Returns a generator of (name, attribute) pairs
568
 
        """
569
 
        return ((prop._dbus_name, prop)
570
 
                for name, prop in
571
 
                inspect.getmembers(self, self._is_dbus_property))
572
 
    
573
 
    def _get_dbus_property(self, interface_name, property_name):
574
 
        """Returns a bound method if one exists which is a D-Bus
575
 
        property with the specified name and interface.
576
 
        """
577
 
        for name in (property_name,
578
 
                     property_name + u"_dbus_property"):
579
 
            prop = getattr(self, name, None)
580
 
            if (prop is None
581
 
                or not self._is_dbus_property(prop)
582
 
                or prop._dbus_name != property_name
583
 
                or (interface_name and prop._dbus_interface
584
 
                    and interface_name != prop._dbus_interface)):
585
 
                continue
586
 
            return prop
587
 
        # No such property
588
 
        raise DBusPropertyNotFound(self.dbus_object_path + u":"
589
 
                                   + interface_name + u"."
590
 
                                   + property_name)
591
 
    
592
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ss",
593
 
                         out_signature=u"v")
594
 
    def Get(self, interface_name, property_name):
595
 
        """Standard D-Bus property Get() method, see D-Bus standard.
596
 
        """
597
 
        prop = self._get_dbus_property(interface_name, property_name)
598
 
        if prop._dbus_access == u"write":
599
 
            raise DBusPropertyAccessException(property_name)
600
 
        value = prop()
601
 
        if not hasattr(value, u"variant_level"):
602
 
            return value
603
 
        return type(value)(value, variant_level=value.variant_level+1)
604
 
    
605
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ssv")
606
 
    def Set(self, interface_name, property_name, value):
607
 
        """Standard D-Bus property Set() method, see D-Bus standard.
608
 
        """
609
 
        prop = self._get_dbus_property(interface_name, property_name)
610
 
        if prop._dbus_access == u"read":
611
 
            raise DBusPropertyAccessException(property_name)
612
 
        if prop._dbus_get_args_options[u"byte_arrays"]:
613
 
            # The byte_arrays option is not supported yet on
614
 
            # signatures other than "ay".
615
 
            if prop._dbus_signature != u"ay":
616
 
                raise ValueError
617
 
            value = dbus.ByteArray(''.join(unichr(byte)
618
 
                                           for byte in value))
619
 
        prop(value)
620
 
    
621
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"s",
622
 
                         out_signature=u"a{sv}")
623
 
    def GetAll(self, interface_name):
624
 
        """Standard D-Bus property GetAll() method, see D-Bus
625
 
        standard.
626
 
 
627
 
        Note: Will not include properties with access="write".
628
 
        """
629
 
        all = {}
630
 
        for name, prop in self._get_all_dbus_properties():
631
 
            if (interface_name
632
 
                and interface_name != prop._dbus_interface):
633
 
                # Interface non-empty but did not match
634
 
                continue
635
 
            # Ignore write-only properties
636
 
            if prop._dbus_access == u"write":
637
 
                continue
638
 
            value = prop()
639
 
            if not hasattr(value, u"variant_level"):
640
 
                all[name] = value
641
 
                continue
642
 
            all[name] = type(value)(value, variant_level=
643
 
                                    value.variant_level+1)
644
 
        return dbus.Dictionary(all, signature=u"sv")
645
 
    
646
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
647
 
                         out_signature=u"s",
648
 
                         path_keyword='object_path',
649
 
                         connection_keyword='connection')
650
 
    def Introspect(self, object_path, connection):
651
 
        """Standard D-Bus method, overloaded to insert property tags.
652
 
        """
653
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
654
 
                                                   connection)
655
 
        try:
656
 
            document = xml.dom.minidom.parseString(xmlstring)
657
 
            def make_tag(document, name, prop):
658
 
                e = document.createElement(u"property")
659
 
                e.setAttribute(u"name", name)
660
 
                e.setAttribute(u"type", prop._dbus_signature)
661
 
                e.setAttribute(u"access", prop._dbus_access)
662
 
                return e
663
 
            for if_tag in document.getElementsByTagName(u"interface"):
664
 
                for tag in (make_tag(document, name, prop)
665
 
                            for name, prop
666
 
                            in self._get_all_dbus_properties()
667
 
                            if prop._dbus_interface
668
 
                            == if_tag.getAttribute(u"name")):
669
 
                    if_tag.appendChild(tag)
670
 
                # Add the names to the return values for the
671
 
                # "org.freedesktop.DBus.Properties" methods
672
 
                if (if_tag.getAttribute(u"name")
673
 
                    == u"org.freedesktop.DBus.Properties"):
674
 
                    for cn in if_tag.getElementsByTagName(u"method"):
675
 
                        if cn.getAttribute(u"name") == u"Get":
676
 
                            for arg in cn.getElementsByTagName(u"arg"):
677
 
                                if (arg.getAttribute(u"direction")
678
 
                                    == u"out"):
679
 
                                    arg.setAttribute(u"name", u"value")
680
 
                        elif cn.getAttribute(u"name") == u"GetAll":
681
 
                            for arg in cn.getElementsByTagName(u"arg"):
682
 
                                if (arg.getAttribute(u"direction")
683
 
                                    == u"out"):
684
 
                                    arg.setAttribute(u"name", u"props")
685
 
            xmlstring = document.toxml(u"utf-8")
686
 
            document.unlink()
687
 
        except (AttributeError, xml.dom.DOMException,
688
 
                xml.parsers.expat.ExpatError), error:
689
 
            logger.error(u"Failed to override Introspection method",
690
 
                         error)
691
 
        return xmlstring
692
 
 
693
 
 
694
 
class ClientDBus(Client, DBusObjectWithProperties):
695
 
    """A Client class using D-Bus
696
 
    
697
 
    Attributes:
698
 
    dbus_object_path: dbus.ObjectPath
699
 
    bus: dbus.SystemBus()
700
 
    """
701
 
    # dbus.service.Object doesn't use super(), so we can't either.
702
 
    
703
 
    def __init__(self, bus = None, *args, **kwargs):
704
 
        self._approvals_pending = 0
705
 
        self.bus = bus
706
 
        Client.__init__(self, *args, **kwargs)
707
 
        # Only now, when this client is initialized, can it show up on
708
 
        # the D-Bus
709
 
        self.dbus_object_path = (dbus.ObjectPath
710
 
                                 (u"/clients/"
711
 
                                  + self.name.replace(u".", u"_")))
712
 
        DBusObjectWithProperties.__init__(self, self.bus,
713
 
                                          self.dbus_object_path)
714
 
 
715
 
    #Could possible return a bool(self._approvals_pending),
716
 
    #but this could mess up approvals_pending += 1 XXX 
717
 
    def _get_approvals_pending(self):
718
 
        return self._approvals_pending
719
 
    def _set_approvals_pending(self, value):
720
 
        old_value = self._approvals_pending
721
 
        self._approvals_pending = value
722
 
        bval = bool(value)
723
 
        if (hasattr(self, "dbus_object_path")
724
 
            and bval is not bool(old_value)):
725
 
            dbus_bool = dbus.Boolean(bval, variant_level=1)
726
 
            self.PropertyChanged(dbus.String(u"approved_pending"),
727
 
                                 dbus_bool)
728
 
 
729
 
    approvals_pending = property(_get_approvals_pending,
730
 
                                 _set_approvals_pending)
731
 
    del _get_approvals_pending, _set_approvals_pending
732
 
    
733
 
    @staticmethod
734
 
    def _datetime_to_dbus(dt, variant_level=0):
735
 
        """Convert a UTC datetime.datetime() to a D-Bus type."""
736
 
        return dbus.String(dt.isoformat(),
737
 
                           variant_level=variant_level)
738
 
    
739
 
    def enable(self):
740
 
        oldstate = getattr(self, u"enabled", False)
741
 
        r = Client.enable(self)
742
 
        if oldstate != self.enabled:
743
 
            # Emit D-Bus signals
744
 
            self.PropertyChanged(dbus.String(u"enabled"),
745
 
                                 dbus.Boolean(True, variant_level=1))
746
 
            self.PropertyChanged(
747
 
                dbus.String(u"last_enabled"),
748
 
                self._datetime_to_dbus(self.last_enabled,
749
 
                                       variant_level=1))
750
 
        return r
751
 
    
752
 
    def disable(self, quiet = False):
753
 
        oldstate = getattr(self, u"enabled", False)
754
 
        r = Client.disable(self, quiet=quiet)
755
 
        if not quiet and oldstate != self.enabled:
756
 
            # Emit D-Bus signal
757
 
            self.PropertyChanged(dbus.String(u"enabled"),
758
 
                                 dbus.Boolean(False, variant_level=1))
759
 
        return r
760
 
    
761
 
    def __del__(self, *args, **kwargs):
762
 
        try:
763
 
            self.remove_from_connection()
764
 
        except LookupError:
765
 
            pass
766
 
        if hasattr(DBusObjectWithProperties, u"__del__"):
767
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
768
 
        Client.__del__(self, *args, **kwargs)
769
 
    
770
 
    def checker_callback(self, pid, condition, command,
771
 
                         *args, **kwargs):
 
242
        gobject.source_remove(self.checker_callback_tag)
772
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)
773
247
        self.checker = None
774
 
        # Emit D-Bus signal
775
 
        self.PropertyChanged(dbus.String(u"checker_running"),
776
 
                             dbus.Boolean(False, variant_level=1))
777
 
        if os.WIFEXITED(condition):
778
 
            exitstatus = os.WEXITSTATUS(condition)
779
 
            # Emit D-Bus signal
780
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
781
 
                                  dbus.Int64(condition),
782
 
                                  dbus.String(command))
783
 
        else:
784
 
            # Emit D-Bus signal
785
 
            self.CheckerCompleted(dbus.Int16(-1),
786
 
                                  dbus.Int64(condition),
787
 
                                  dbus.String(command))
788
 
        
789
 
        return Client.checker_callback(self, pid, condition, command,
790
 
                                       *args, **kwargs)
791
 
    
792
 
    def checked_ok(self, *args, **kwargs):
793
 
        r = Client.checked_ok(self, *args, **kwargs)
794
 
        # Emit D-Bus signal
795
 
        self.PropertyChanged(
796
 
            dbus.String(u"last_checked_ok"),
797
 
            (self._datetime_to_dbus(self.last_checked_ok,
798
 
                                    variant_level=1)))
799
 
        return r
800
 
    
801
 
    def start_checker(self, *args, **kwargs):
802
 
        old_checker = self.checker
803
 
        if self.checker is not None:
804
 
            old_checker_pid = self.checker.pid
805
 
        else:
806
 
            old_checker_pid = None
807
 
        r = Client.start_checker(self, *args, **kwargs)
808
 
        # Only if new checker process was started
809
 
        if (self.checker is not None
810
 
            and old_checker_pid != self.checker.pid):
811
 
            # Emit D-Bus signal
812
 
            self.CheckerStarted(self.current_checker_command)
813
 
            self.PropertyChanged(
814
 
                dbus.String(u"checker_running"),
815
 
                dbus.Boolean(True, variant_level=1))
816
 
        return r
817
 
    
818
 
    def stop_checker(self, *args, **kwargs):
819
 
        old_checker = getattr(self, u"checker", None)
820
 
        r = Client.stop_checker(self, *args, **kwargs)
821
 
        if (old_checker is not None
822
 
            and getattr(self, u"checker", None) is None):
823
 
            self.PropertyChanged(dbus.String(u"checker_running"),
824
 
                                 dbus.Boolean(False, variant_level=1))
825
 
        return r
826
 
 
827
 
    def _reset_approved(self):
828
 
        self._approved = None
829
 
        return False
830
 
    
831
 
    def approve(self, value=True):
832
 
        self.send_changedstate()
833
 
        self._approved = value
834
 
        gobject.timeout_add(self._timedelta_to_milliseconds(self.approved_duration),
835
 
                            self._reset_approved)
836
 
    
837
 
    
838
 
    ## D-Bus methods, signals & properties
839
 
    _interface = u"se.bsnet.fukt.Mandos.Client"
840
 
    
841
 
    ## Signals
842
 
    
843
 
    # CheckerCompleted - signal
844
 
    @dbus.service.signal(_interface, signature=u"nxs")
845
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
846
 
        "D-Bus signal"
847
 
        pass
848
 
    
849
 
    # CheckerStarted - signal
850
 
    @dbus.service.signal(_interface, signature=u"s")
851
 
    def CheckerStarted(self, command):
852
 
        "D-Bus signal"
853
 
        pass
854
 
    
855
 
    # PropertyChanged - signal
856
 
    @dbus.service.signal(_interface, signature=u"sv")
857
 
    def PropertyChanged(self, property, value):
858
 
        "D-Bus signal"
859
 
        pass
860
 
    
861
 
    # GotSecret - signal
862
 
    # XXXTEDDY Is sent after succesfull transfer of secret from mandos-server to mandos-client
863
 
    @dbus.service.signal(_interface)
864
 
    def GotSecret(self):
865
 
        "D-Bus signal"
866
 
        pass
867
 
    
868
 
    # Rejected - signal
869
 
    @dbus.service.signal(_interface, signature=u"s")
870
 
    def Rejected(self, reason):
871
 
        "D-Bus signal"
872
 
        pass
873
 
    
874
 
    # NeedApproval - signal
875
 
    @dbus.service.signal(_interface, signature=u"db")
876
 
    def NeedApproval(self, timeout, default):
877
 
        "D-Bus signal"
878
 
        pass
879
 
    
880
 
    ## Methods
881
 
 
882
 
    # Approve - method
883
 
    @dbus.service.method(_interface, in_signature=u"b")
884
 
    def Approve(self, value):
885
 
        self.approve(value)
886
 
 
887
 
    # CheckedOK - method
888
 
    @dbus.service.method(_interface)
889
 
    def CheckedOK(self):
890
 
        return self.checked_ok()
891
 
    
892
 
    # Enable - method
893
 
    @dbus.service.method(_interface)
894
 
    def Enable(self):
895
 
        "D-Bus method"
896
 
        self.enable()
897
 
    
898
 
    # StartChecker - method
899
 
    @dbus.service.method(_interface)
900
 
    def StartChecker(self):
901
 
        "D-Bus method"
902
 
        self.start_checker()
903
 
    
904
 
    # Disable - method
905
 
    @dbus.service.method(_interface)
906
 
    def Disable(self):
907
 
        "D-Bus method"
908
 
        self.disable()
909
 
    
910
 
    # StopChecker - method
911
 
    @dbus.service.method(_interface)
912
 
    def StopChecker(self):
913
 
        self.stop_checker()
914
 
    
915
 
    ## Properties
916
 
    
917
 
    # approved_pending - property
918
 
    @dbus_service_property(_interface, signature=u"b", access=u"read")
919
 
    def approved_pending_dbus_property(self):
920
 
        return dbus.Boolean(bool(self.approvals_pending))
921
 
    
922
 
    # approved_by_default - property
923
 
    @dbus_service_property(_interface, signature=u"b",
924
 
                           access=u"readwrite")
925
 
    def approved_by_default_dbus_property(self):
926
 
        return dbus.Boolean(self.approved_by_default)
927
 
    
928
 
    # approved_delay - property
929
 
    @dbus_service_property(_interface, signature=u"t",
930
 
                           access=u"readwrite")
931
 
    def approved_delay_dbus_property(self):
932
 
        return dbus.UInt64(self.approved_delay_milliseconds())
933
 
    
934
 
    # approved_duration - property
935
 
    @dbus_service_property(_interface, signature=u"t",
936
 
                           access=u"readwrite")
937
 
    def approved_duration_dbus_property(self):
938
 
        return dbus.UInt64(self._timedelta_to_milliseconds(
939
 
                self.approved_duration))
940
 
    
941
 
    # name - property
942
 
    @dbus_service_property(_interface, signature=u"s", access=u"read")
943
 
    def name_dbus_property(self):
944
 
        return dbus.String(self.name)
945
 
    
946
 
    # fingerprint - property
947
 
    @dbus_service_property(_interface, signature=u"s", access=u"read")
948
 
    def fingerprint_dbus_property(self):
949
 
        return dbus.String(self.fingerprint)
950
 
    
951
 
    # host - property
952
 
    @dbus_service_property(_interface, signature=u"s",
953
 
                           access=u"readwrite")
954
 
    def host_dbus_property(self, value=None):
955
 
        if value is None:       # get
956
 
            return dbus.String(self.host)
957
 
        self.host = value
958
 
        # Emit D-Bus signal
959
 
        self.PropertyChanged(dbus.String(u"host"),
960
 
                             dbus.String(value, variant_level=1))
961
 
    
962
 
    # created - property
963
 
    @dbus_service_property(_interface, signature=u"s", access=u"read")
964
 
    def created_dbus_property(self):
965
 
        return dbus.String(self._datetime_to_dbus(self.created))
966
 
    
967
 
    # last_enabled - property
968
 
    @dbus_service_property(_interface, signature=u"s", access=u"read")
969
 
    def last_enabled_dbus_property(self):
970
 
        if self.last_enabled is None:
971
 
            return dbus.String(u"")
972
 
        return dbus.String(self._datetime_to_dbus(self.last_enabled))
973
 
    
974
 
    # enabled - property
975
 
    @dbus_service_property(_interface, signature=u"b",
976
 
                           access=u"readwrite")
977
 
    def enabled_dbus_property(self, value=None):
978
 
        if value is None:       # get
979
 
            return dbus.Boolean(self.enabled)
980
 
        if value:
981
 
            self.enable()
982
 
        else:
983
 
            self.disable()
984
 
    
985
 
    # last_checked_ok - property
986
 
    @dbus_service_property(_interface, signature=u"s",
987
 
                           access=u"readwrite")
988
 
    def last_checked_ok_dbus_property(self, value=None):
989
 
        if value is not None:
990
 
            self.checked_ok()
991
 
            return
992
 
        if self.last_checked_ok is None:
993
 
            return dbus.String(u"")
994
 
        return dbus.String(self._datetime_to_dbus(self
995
 
                                                  .last_checked_ok))
996
 
    
997
 
    # timeout - property
998
 
    @dbus_service_property(_interface, signature=u"t",
999
 
                           access=u"readwrite")
1000
 
    def timeout_dbus_property(self, value=None):
1001
 
        if value is None:       # get
1002
 
            return dbus.UInt64(self.timeout_milliseconds())
1003
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1004
 
        # Emit D-Bus signal
1005
 
        self.PropertyChanged(dbus.String(u"timeout"),
1006
 
                             dbus.UInt64(value, variant_level=1))
1007
 
        if getattr(self, u"disable_initiator_tag", None) is None:
1008
 
            return
1009
 
        # Reschedule timeout
1010
 
        gobject.source_remove(self.disable_initiator_tag)
1011
 
        self.disable_initiator_tag = None
1012
 
        time_to_die = (self.
1013
 
                       _timedelta_to_milliseconds((self
1014
 
                                                   .last_checked_ok
1015
 
                                                   + self.timeout)
1016
 
                                                  - datetime.datetime
1017
 
                                                  .utcnow()))
1018
 
        if time_to_die <= 0:
1019
 
            # The timeout has passed
1020
 
            self.disable()
1021
 
        else:
1022
 
            self.disable_initiator_tag = (gobject.timeout_add
1023
 
                                          (time_to_die, self.disable))
1024
 
    
1025
 
    # interval - property
1026
 
    @dbus_service_property(_interface, signature=u"t",
1027
 
                           access=u"readwrite")
1028
 
    def interval_dbus_property(self, value=None):
1029
 
        if value is None:       # get
1030
 
            return dbus.UInt64(self.interval_milliseconds())
1031
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1032
 
        # Emit D-Bus signal
1033
 
        self.PropertyChanged(dbus.String(u"interval"),
1034
 
                             dbus.UInt64(value, variant_level=1))
1035
 
        if getattr(self, u"checker_initiator_tag", None) is None:
1036
 
            return
1037
 
        # Reschedule checker run
1038
 
        gobject.source_remove(self.checker_initiator_tag)
1039
 
        self.checker_initiator_tag = (gobject.timeout_add
1040
 
                                      (value, self.start_checker))
1041
 
        self.start_checker()    # Start one now, too
1042
 
 
1043
 
    # checker - property
1044
 
    @dbus_service_property(_interface, signature=u"s",
1045
 
                           access=u"readwrite")
1046
 
    def checker_dbus_property(self, value=None):
1047
 
        if value is None:       # get
1048
 
            return dbus.String(self.checker_command)
1049
 
        self.checker_command = value
1050
 
        # Emit D-Bus signal
1051
 
        self.PropertyChanged(dbus.String(u"checker"),
1052
 
                             dbus.String(self.checker_command,
1053
 
                                         variant_level=1))
1054
 
    
1055
 
    # checker_running - property
1056
 
    @dbus_service_property(_interface, signature=u"b",
1057
 
                           access=u"readwrite")
1058
 
    def checker_running_dbus_property(self, value=None):
1059
 
        if value is None:       # get
1060
 
            return dbus.Boolean(self.checker is not None)
1061
 
        if value:
1062
 
            self.start_checker()
1063
 
        else:
1064
 
            self.stop_checker()
1065
 
    
1066
 
    # object_path - property
1067
 
    @dbus_service_property(_interface, signature=u"o", access=u"read")
1068
 
    def object_path_dbus_property(self):
1069
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1070
 
    
1071
 
    # secret = property
1072
 
    @dbus_service_property(_interface, signature=u"ay",
1073
 
                           access=u"write", byte_arrays=True)
1074
 
    def secret_dbus_property(self, value):
1075
 
        self.secret = str(value)
1076
 
    
1077
 
    del _interface
1078
 
 
1079
 
 
1080
 
class ProxyClient(object):
1081
 
    def __init__(self, child_pipe, fpr, address):
1082
 
        self._pipe = child_pipe
1083
 
        self._pipe.send(('init', fpr, address))
1084
 
        if not self._pipe.recv():
1085
 
            raise KeyError()
1086
 
 
1087
 
    def __getattribute__(self, name):
1088
 
        if(name == '_pipe'):
1089
 
            return super(ProxyClient, self).__getattribute__(name)
1090
 
        self._pipe.send(('getattr', name))
1091
 
        data = self._pipe.recv()
1092
 
        if data[0] == 'data':
1093
 
            return data[1]
1094
 
        if data[0] == 'function':
1095
 
            def func(*args, **kwargs):
1096
 
                self._pipe.send(('funcall', name, args, kwargs))
1097
 
                return self._pipe.recv()[1]
1098
 
            return func
1099
 
 
1100
 
    def __setattr__(self, name, value):
1101
 
        if(name == '_pipe'):
1102
 
            return super(ProxyClient, self).__setattr__(name, value)
1103
 
        self._pipe.send(('setattr', name, value))
1104
 
 
1105
 
 
1106
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1107
 
    """A class to handle client connections.
1108
 
    
1109
 
    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.
1110
307
    Note: This will run in its own forked process."""
1111
308
    
1112
309
    def handle(self):
1113
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1114
 
            logger.info(u"TCP connection from: %s",
1115
 
                        unicode(self.client_address))
1116
 
            logger.debug(u"Pipe FD: %d",
1117
 
                         self.server.child_pipe.fileno())
1118
 
 
1119
 
            session = (gnutls.connection
1120
 
                       .ClientSession(self.request,
1121
 
                                      gnutls.connection
1122
 
                                      .X509Credentials()))
1123
 
 
1124
 
            # Note: gnutls.connection.X509Credentials is really a
1125
 
            # generic GnuTLS certificate credentials object so long as
1126
 
            # no X.509 keys are added to it.  Therefore, we can use it
1127
 
            # here despite using OpenPGP certificates.
1128
 
 
1129
 
            #priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
1130
 
            #                      u"+AES-256-CBC", u"+SHA1",
1131
 
            #                      u"+COMP-NULL", u"+CTYPE-OPENPGP",
1132
 
            #                      u"+DHE-DSS"))
1133
 
            # Use a fallback default, since this MUST be set.
1134
 
            priority = self.server.gnutls_priority
1135
 
            if priority is None:
1136
 
                priority = u"NORMAL"
1137
 
            (gnutls.library.functions
1138
 
             .gnutls_priority_set_direct(session._c_object,
1139
 
                                         priority, None))
1140
 
 
1141
 
            # Start communication using the Mandos protocol
1142
 
            # Get protocol number
1143
 
            line = self.request.makefile().readline()
1144
 
            logger.debug(u"Protocol version: %r", line)
1145
 
            try:
1146
 
                if int(line.strip().split()[0]) > 1:
1147
 
                    raise RuntimeError
1148
 
            except (ValueError, IndexError, RuntimeError), error:
1149
 
                logger.error(u"Unknown protocol version: %s", error)
1150
 
                return
1151
 
 
1152
 
            # Start GnuTLS connection
1153
 
            try:
1154
 
                session.handshake()
1155
 
            except gnutls.errors.GNUTLSError, error:
1156
 
                logger.warning(u"Handshake failed: %s", error)
1157
 
                # Do not run session.bye() here: the session is not
1158
 
                # established.  Just abandon the request.
1159
 
                return
1160
 
            logger.debug(u"Handshake succeeded")
1161
 
 
1162
 
            approval_required = False
1163
 
            try:
1164
 
                try:
1165
 
                    fpr = self.fingerprint(self.peer_certificate
1166
 
                                           (session))
1167
 
                except (TypeError, gnutls.errors.GNUTLSError), error:
1168
 
                    logger.warning(u"Bad certificate: %s", error)
1169
 
                    return
1170
 
                logger.debug(u"Fingerprint: %s", fpr)
1171
 
 
1172
 
                try:
1173
 
                    client = ProxyClient(child_pipe, fpr,
1174
 
                                         self.client_address)
1175
 
                except KeyError:
1176
 
                    return
1177
 
                
1178
 
                if client.approved_delay:
1179
 
                    delay = client.approved_delay
1180
 
                    client.approvals_pending += 1
1181
 
                    approval_required = True
1182
 
                
1183
 
                while True:
1184
 
                    if not client.enabled:
1185
 
                        logger.warning(u"Client %s is disabled",
1186
 
                                       client.name)
1187
 
                        if self.server.use_dbus:
1188
 
                            # Emit D-Bus signal
1189
 
                            client.Rejected("Disabled")                    
1190
 
                        return
1191
 
                    
1192
 
                    if client._approved or not client.approved_delay:
1193
 
                        #We are approved or approval is disabled
1194
 
                        break
1195
 
                    elif client._approved is None:
1196
 
                        logger.info(u"Client %s need approval",
1197
 
                                    client.name)
1198
 
                        if self.server.use_dbus:
1199
 
                            # Emit D-Bus signal
1200
 
                            client.NeedApproval(
1201
 
                                client.approved_delay_milliseconds(),
1202
 
                                client.approved_by_default)
1203
 
                    else:
1204
 
                        logger.warning(u"Client %s was not approved",
1205
 
                                       client.name)
1206
 
                        if self.server.use_dbus:
1207
 
                            # Emit D-Bus signal
1208
 
                            client.Rejected("Disapproved")
1209
 
                        return
1210
 
                    
1211
 
                    #wait until timeout or approved
1212
 
                    #x = float(client._timedelta_to_milliseconds(delay))
1213
 
                    time = datetime.datetime.now()
1214
 
                    client.changedstate.acquire()
1215
 
                    client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1216
 
                    client.changedstate.release()
1217
 
                    time2 = datetime.datetime.now()
1218
 
                    if (time2 - time) >= delay:
1219
 
                        if not client.approved_by_default:
1220
 
                            logger.warning("Client %s timed out while"
1221
 
                                           " waiting for approval",
1222
 
                                           client.name)
1223
 
                            if self.server.use_dbus:
1224
 
                                # Emit D-Bus signal
1225
 
                                client.Rejected("Time out")
1226
 
                            return
1227
 
                        else:
1228
 
                            break
1229
 
                    else:
1230
 
                        delay -= time2 - time
1231
 
                
1232
 
                sent_size = 0
1233
 
                while sent_size < len(client.secret):
1234
 
                    # XXX handle session exception
1235
 
                    sent = session.send(client.secret[sent_size:])
1236
 
                    logger.debug(u"Sent: %d, remaining: %d",
1237
 
                                 sent, len(client.secret)
1238
 
                                 - (sent_size + sent))
1239
 
                    sent_size += sent
1240
 
 
1241
 
                logger.info(u"Sending secret to %s", client.name)
1242
 
                # bump the timeout as if seen
1243
 
                client.checked_ok()
1244
 
                if self.server.use_dbus:
1245
 
                    # Emit D-Bus signal
1246
 
                    client.GotSecret()
1247
 
            
1248
 
            finally:
1249
 
                if approval_required:
1250
 
                    client.approvals_pending -= 1
1251
 
                session.bye()
1252
 
    
1253
 
    @staticmethod
1254
 
    def peer_certificate(session):
1255
 
        "Return the peer's OpenPGP certificate as a bytestring"
1256
 
        # If not an OpenPGP certificate...
1257
 
        if (gnutls.library.functions
1258
 
            .gnutls_certificate_type_get(session._c_object)
1259
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1260
 
            # ...do the normal thing
1261
 
            return session.peer_certificate
1262
 
        list_size = ctypes.c_uint(1)
1263
 
        cert_list = (gnutls.library.functions
1264
 
                     .gnutls_certificate_get_peers
1265
 
                     (session._c_object, ctypes.byref(list_size)))
1266
 
        if not bool(cert_list) and list_size.value != 0:
1267
 
            raise gnutls.errors.GNUTLSError(u"error getting peer"
1268
 
                                            u" certificate")
1269
 
        if list_size.value == 0:
1270
 
            return None
1271
 
        cert = cert_list[0]
1272
 
        return ctypes.string_at(cert.data, cert.size)
1273
 
    
1274
 
    @staticmethod
1275
 
    def fingerprint(openpgp):
1276
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1277
 
        # New GnuTLS "datum" with the OpenPGP public key
1278
 
        datum = (gnutls.library.types
1279
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1280
 
                                             ctypes.POINTER
1281
 
                                             (ctypes.c_ubyte)),
1282
 
                                 ctypes.c_uint(len(openpgp))))
1283
 
        # New empty GnuTLS certificate
1284
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1285
 
        (gnutls.library.functions
1286
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1287
 
        # Import the OpenPGP public key into the certificate
1288
 
        (gnutls.library.functions
1289
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1290
 
                                    gnutls.library.constants
1291
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1292
 
        # Verify the self signature in the key
1293
 
        crtverify = ctypes.c_uint()
1294
 
        (gnutls.library.functions
1295
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1296
 
                                         ctypes.byref(crtverify)))
1297
 
        if crtverify.value != 0:
1298
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1299
 
            raise (gnutls.errors.CertificateSecurityError
1300
 
                   (u"Verify failed"))
1301
 
        # New buffer for the fingerprint
1302
 
        buf = ctypes.create_string_buffer(20)
1303
 
        buf_len = ctypes.c_size_t()
1304
 
        # Get the fingerprint from the certificate into the buffer
1305
 
        (gnutls.library.functions
1306
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1307
 
                                             ctypes.byref(buf_len)))
1308
 
        # Deinit the certificate
1309
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1310
 
        # Convert the buffer to a Python bytestring
1311
 
        fpr = ctypes.string_at(buf, buf_len.value)
1312
 
        # Convert the bytestring to hexadecimal notation
1313
 
        hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
1314
 
        return hex_fpr
1315
 
 
1316
 
 
1317
 
class MultiprocessingMixIn(object):
1318
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1319
 
    def sub_process_main(self, request, address):
1320
 
        try:
1321
 
            self.finish_request(request, address)
1322
 
        except:
1323
 
            self.handle_error(request, address)
1324
 
        self.close_request(request)
1325
 
            
1326
 
    def process_request(self, request, address):
1327
 
        """Start a new process to process the request."""
1328
 
        multiprocessing.Process(target = self.sub_process_main,
1329
 
                                args = (request, address)).start()
1330
 
 
1331
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1332
 
    """ adds a pipe to the MixIn """
1333
 
    def process_request(self, request, client_address):
1334
 
        """Overrides and wraps the original process_request().
1335
 
        
1336
 
        This function creates a new pipe in self.pipe
1337
 
        """
1338
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1339
 
 
1340
 
        super(MultiprocessingMixInWithPipe,
1341
 
              self).process_request(request, client_address)
1342
 
        self.child_pipe.close()
1343
 
        self.add_pipe(parent_pipe)
1344
 
 
1345
 
    def add_pipe(self, parent_pipe):
1346
 
        """Dummy function; override as necessary"""
1347
 
        pass
1348
 
 
1349
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1350
 
                     socketserver.TCPServer, object):
1351
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1352
 
    
 
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.
1353
367
    Attributes:
1354
 
        enabled:        Boolean; whether this server is activated yet
1355
 
        interface:      None or a network interface name (string)
1356
 
        use_ipv6:       Boolean; to use IPv6 or not
 
368
        options:        Command line options
 
369
        clients:        Set() of Client objects
1357
370
    """
1358
 
    def __init__(self, server_address, RequestHandlerClass,
1359
 
                 interface=None, use_ipv6=True):
1360
 
        self.interface = interface
1361
 
        if use_ipv6:
1362
 
            self.address_family = socket.AF_INET6
1363
 
        socketserver.TCPServer.__init__(self, server_address,
1364
 
                                        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)
1365
380
    def server_bind(self):
1366
381
        """This overrides the normal server_bind() function
1367
382
        to bind to an interface if one was specified, and also NOT to
1368
383
        bind to an address or port if they were not specified."""
1369
 
        if self.interface is not None:
1370
 
            if SO_BINDTODEVICE is None:
1371
 
                logger.error(u"SO_BINDTODEVICE does not exist;"
1372
 
                             u" cannot bind to interface %s",
1373
 
                             self.interface)
1374
 
            else:
1375
 
                try:
1376
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1377
 
                                           SO_BINDTODEVICE,
1378
 
                                           str(self.interface
1379
 
                                               + u'\0'))
1380
 
                except socket.error, error:
1381
 
                    if error[0] == errno.EPERM:
1382
 
                        logger.error(u"No permission to"
1383
 
                                     u" bind to interface %s",
1384
 
                                     self.interface)
1385
 
                    elif error[0] == errno.ENOPROTOOPT:
1386
 
                        logger.error(u"SO_BINDTODEVICE not available;"
1387
 
                                     u" cannot bind to interface %s",
1388
 
                                     self.interface)
1389
 
                    else:
1390
 
                        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
1391
399
        # Only bind(2) the socket if we really need to.
1392
400
        if self.server_address[0] or self.server_address[1]:
1393
401
            if not self.server_address[0]:
1394
 
                if self.address_family == socket.AF_INET6:
1395
 
                    any_address = u"::" # in6addr_any
1396
 
                else:
1397
 
                    any_address = socket.INADDR_ANY
1398
 
                self.server_address = (any_address,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
1399
404
                                       self.server_address[1])
1400
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
1401
406
                self.server_address = (self.server_address[0],
1402
407
                                       0)
1403
 
#                 if self.interface:
1404
 
#                     self.server_address = (self.server_address[0],
1405
 
#                                            0, # port
1406
 
#                                            0, # flowinfo
1407
 
#                                            if_nametoindex
1408
 
#                                            (self.interface))
1409
 
            return socketserver.TCPServer.server_bind(self)
1410
 
 
1411
 
 
1412
 
class MandosServer(IPv6_TCPServer):
1413
 
    """Mandos server.
1414
 
    
1415
 
    Attributes:
1416
 
        clients:        set of Client objects
1417
 
        gnutls_priority GnuTLS priority string
1418
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1419
 
    
1420
 
    Assumes a gobject.MainLoop event loop.
1421
 
    """
1422
 
    def __init__(self, server_address, RequestHandlerClass,
1423
 
                 interface=None, use_ipv6=True, clients=None,
1424
 
                 gnutls_priority=None, use_dbus=True):
1425
 
        self.enabled = False
1426
 
        self.clients = clients
1427
 
        if self.clients is None:
1428
 
            self.clients = set()
1429
 
        self.use_dbus = use_dbus
1430
 
        self.gnutls_priority = gnutls_priority
1431
 
        IPv6_TCPServer.__init__(self, server_address,
1432
 
                                RequestHandlerClass,
1433
 
                                interface = interface,
1434
 
                                use_ipv6 = use_ipv6)
1435
 
    def server_activate(self):
1436
 
        if self.enabled:
1437
 
            return socketserver.TCPServer.server_activate(self)
1438
 
    def enable(self):
1439
 
        self.enabled = True
1440
 
    def add_pipe(self, parent_pipe):
1441
 
        # Call "handle_ipc" for both data and EOF events
1442
 
        gobject.io_add_watch(parent_pipe.fileno(),
1443
 
                             gobject.IO_IN | gobject.IO_HUP,
1444
 
                             functools.partial(self.handle_ipc,
1445
 
                                               parent_pipe = parent_pipe))
1446
 
        
1447
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1448
 
                   client_object=None):
1449
 
        condition_names = {
1450
 
            gobject.IO_IN: u"IN",   # There is data to read.
1451
 
            gobject.IO_OUT: u"OUT", # Data can be written (without
1452
 
                                    # blocking).
1453
 
            gobject.IO_PRI: u"PRI", # There is urgent data to read.
1454
 
            gobject.IO_ERR: u"ERR", # Error condition.
1455
 
            gobject.IO_HUP: u"HUP"  # Hung up (the connection has been
1456
 
                                    # broken, usually for pipes and
1457
 
                                    # sockets).
1458
 
            }
1459
 
        conditions_string = ' | '.join(name
1460
 
                                       for cond, name in
1461
 
                                       condition_names.iteritems()
1462
 
                                       if cond & condition)
1463
 
        logger.debug(u"Handling IPC: FD = %d, condition = %s", source,
1464
 
                     conditions_string)
1465
 
 
1466
 
        # XXXTEDDY error or the other end of multiprocessing.Pipe has closed
1467
 
        if condition & gobject.IO_HUP or condition & gobject.IO_ERR:
1468
 
            return False
1469
 
        
1470
 
        # Read a request from the child
1471
 
        request = parent_pipe.recv()
1472
 
        logger.debug(u"IPC request: %s", repr(request))
1473
 
        command = request[0]
1474
 
        
1475
 
        if command == 'init':
1476
 
            fpr = request[1]
1477
 
            address = request[2]
1478
 
            
1479
 
            for c in self.clients:
1480
 
                if c.fingerprint == fpr:
1481
 
                    client = c
1482
 
                    break
1483
 
            else:
1484
 
                logger.warning(u"Client not found for fingerprint: %s, ad"
1485
 
                               u"dress: %s", fpr, address)
1486
 
                if self.use_dbus:
1487
 
                    # Emit D-Bus signal
1488
 
                    mandos_dbus_service.ClientNotFound(fpr, address)
1489
 
                parent_pipe.send(False)
1490
 
                return False
1491
 
            
1492
 
            gobject.io_add_watch(parent_pipe.fileno(),
1493
 
                                 gobject.IO_IN | gobject.IO_HUP,
1494
 
                                 functools.partial(self.handle_ipc,
1495
 
                                                   parent_pipe = parent_pipe,
1496
 
                                                   client_object = client))
1497
 
            parent_pipe.send(True)
1498
 
            # remove the old hook in favor of the new above hook on same fileno
1499
 
            return False
1500
 
        if command == 'funcall':
1501
 
            funcname = request[1]
1502
 
            args = request[2]
1503
 
            kwargs = request[3]
1504
 
            
1505
 
            parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1506
 
 
1507
 
        if command == 'getattr':
1508
 
            attrname = request[1]
1509
 
            if callable(client_object.__getattribute__(attrname)):
1510
 
                parent_pipe.send(('function',))
1511
 
            else:
1512
 
                parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1513
 
        
1514
 
        if command == 'setattr':
1515
 
            attrname = request[1]
1516
 
            value = request[2]
1517
 
            setattr(client_object, attrname, value)
1518
 
 
1519
 
        return True
 
408
            return super(type(self), self).server_bind()
1520
409
 
1521
410
 
1522
411
def string_to_delta(interval):
1523
412
    """Parse a string and return a datetime.timedelta
1524
 
    
1525
 
    >>> string_to_delta(u'7d')
 
413
 
 
414
    >>> string_to_delta('7d')
1526
415
    datetime.timedelta(7)
1527
 
    >>> string_to_delta(u'60s')
 
416
    >>> string_to_delta('60s')
1528
417
    datetime.timedelta(0, 60)
1529
 
    >>> string_to_delta(u'60m')
 
418
    >>> string_to_delta('60m')
1530
419
    datetime.timedelta(0, 3600)
1531
 
    >>> string_to_delta(u'24h')
 
420
    >>> string_to_delta('24h')
1532
421
    datetime.timedelta(1)
1533
422
    >>> string_to_delta(u'1w')
1534
423
    datetime.timedelta(7)
1535
 
    >>> string_to_delta(u'5m 30s')
1536
 
    datetime.timedelta(0, 330)
1537
424
    """
1538
 
    timevalue = datetime.timedelta(0)
1539
 
    for s in interval.split():
1540
 
        try:
1541
 
            suffix = unicode(s[-1])
1542
 
            value = int(s[:-1])
1543
 
            if suffix == u"d":
1544
 
                delta = datetime.timedelta(value)
1545
 
            elif suffix == u"s":
1546
 
                delta = datetime.timedelta(0, value)
1547
 
            elif suffix == u"m":
1548
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1549
 
            elif suffix == u"h":
1550
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1551
 
            elif suffix == u"w":
1552
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1553
 
            else:
1554
 
                raise ValueError(u"Unknown suffix %r" % suffix)
1555
 
        except (ValueError, IndexError), e:
1556
 
            raise ValueError(e.message)
1557
 
        timevalue += delta
1558
 
    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
1559
515
 
1560
516
 
1561
517
def if_nametoindex(interface):
1562
 
    """Call the C function if_nametoindex(), or equivalent
1563
 
    
1564
 
    Note: This function cannot accept a unicode string."""
1565
 
    global if_nametoindex
 
518
    """Call the C function if_nametoindex()"""
1566
519
    try:
1567
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1568
 
                          (ctypes.util.find_library(u"c"))
1569
 
                          .if_nametoindex)
 
520
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
521
        return libc.if_nametoindex(interface)
1570
522
    except (OSError, AttributeError):
1571
 
        logger.warning(u"Doing if_nametoindex the hard way")
1572
 
        def if_nametoindex(interface):
1573
 
            "Get an interface index the hard way, i.e. using fcntl()"
1574
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
1575
 
            with contextlib.closing(socket.socket()) as s:
1576
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1577
 
                                    struct.pack(str(u"16s16x"),
1578
 
                                                interface))
1579
 
            interface_index = struct.unpack(str(u"I"),
1580
 
                                            ifreq[16:20])[0]
1581
 
            return interface_index
1582
 
    return if_nametoindex(interface)
1583
 
 
1584
 
 
1585
 
def daemon(nochdir = False, noclose = False):
1586
 
    """See daemon(3).  Standard BSD Unix function.
1587
 
    
1588
 
    This should really exist as os.daemon, but it doesn't (yet)."""
1589
 
    if os.fork():
1590
 
        sys.exit()
1591
 
    os.setsid()
1592
 
    if not nochdir:
1593
 
        os.chdir(u"/")
1594
 
    if os.fork():
1595
 
        sys.exit()
1596
 
    if not noclose:
1597
 
        # Close all standard open file descriptors
1598
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1599
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1600
 
            raise OSError(errno.ENODEV,
1601
 
                          u"%s not a character device"
1602
 
                          % os.path.devnull)
1603
 
        os.dup2(null, sys.stdin.fileno())
1604
 
        os.dup2(null, sys.stdout.fileno())
1605
 
        os.dup2(null, sys.stderr.fileno())
1606
 
        if null > 2:
1607
 
            os.close(null)
1608
 
 
1609
 
 
1610
 
def main():
1611
 
    
1612
 
    ##################################################################
1613
 
    # Parsing of options, both command line and config file
1614
 
    
1615
 
    parser = optparse.OptionParser(version = "%%prog %s" % version)
1616
 
    parser.add_option("-i", u"--interface", type=u"string",
1617
 
                      metavar="IF", help=u"Bind to interface IF")
1618
 
    parser.add_option("-a", u"--address", type=u"string",
1619
 
                      help=u"Address to listen for requests on")
1620
 
    parser.add_option("-p", u"--port", type=u"int",
1621
 
                      help=u"Port number to receive requests on")
1622
 
    parser.add_option("--check", action=u"store_true",
1623
 
                      help=u"Run self-test")
1624
 
    parser.add_option("--debug", action=u"store_true",
1625
 
                      help=u"Debug mode; run in foreground and log to"
1626
 
                      u" terminal")
1627
 
    parser.add_option("--priority", type=u"string", help=u"GnuTLS"
1628
 
                      u" priority string (see GnuTLS documentation)")
1629
 
    parser.add_option("--servicename", type=u"string",
1630
 
                      metavar=u"NAME", help=u"Zeroconf service name")
1631
 
    parser.add_option("--configdir", type=u"string",
1632
 
                      default=u"/etc/mandos", metavar=u"DIR",
1633
 
                      help=u"Directory to search for configuration"
1634
 
                      u" files")
1635
 
    parser.add_option("--no-dbus", action=u"store_false",
1636
 
                      dest=u"use_dbus", help=u"Do not provide D-Bus"
1637
 
                      u" system bus interface")
1638
 
    parser.add_option("--no-ipv6", action=u"store_false",
1639
 
                      dest=u"use_ipv6", help=u"Do not use IPv6")
1640
 
    options = parser.parse_args()[0]
 
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()
1641
566
    
1642
567
    if options.check:
1643
568
        import doctest
1644
569
        doctest.testmod()
1645
570
        sys.exit()
1646
571
    
1647
 
    # Default values for config file for server-global settings
1648
 
    server_defaults = { u"interface": u"",
1649
 
                        u"address": u"",
1650
 
                        u"port": u"",
1651
 
                        u"debug": u"False",
1652
 
                        u"priority":
1653
 
                        u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1654
 
                        u"servicename": u"Mandos",
1655
 
                        u"use_dbus": u"True",
1656
 
                        u"use_ipv6": u"True",
1657
 
                        }
1658
 
    
1659
 
    # Parse config file for server-global settings
1660
 
    server_config = configparser.SafeConfigParser(server_defaults)
1661
 
    del server_defaults
1662
 
    server_config.read(os.path.join(options.configdir,
1663
 
                                    u"mandos.conf"))
1664
 
    # Convert the SafeConfigParser object to a dict
1665
 
    server_settings = server_config.defaults()
1666
 
    # Use the appropriate methods on the non-string config options
1667
 
    for option in (u"debug", u"use_dbus", u"use_ipv6"):
1668
 
        server_settings[option] = server_config.getboolean(u"DEFAULT",
1669
 
                                                           option)
1670
 
    if server_settings["port"]:
1671
 
        server_settings["port"] = server_config.getint(u"DEFAULT",
1672
 
                                                       u"port")
1673
 
    del server_config
1674
 
    
1675
 
    # Override the settings from the config file with command line
1676
 
    # options, if set.
1677
 
    for option in (u"interface", u"address", u"port", u"debug",
1678
 
                   u"priority", u"servicename", u"configdir",
1679
 
                   u"use_dbus", u"use_ipv6"):
1680
 
        value = getattr(options, option)
1681
 
        if value is not None:
1682
 
            server_settings[option] = value
1683
 
    del options
1684
 
    # Force all strings to be unicode
1685
 
    for option in server_settings.keys():
1686
 
        if type(server_settings[option]) is str:
1687
 
            server_settings[option] = unicode(server_settings[option])
1688
 
    # Now we have our good server settings in "server_settings"
1689
 
    
1690
 
    ##################################################################
1691
 
    
1692
 
    # For convenience
1693
 
    debug = server_settings[u"debug"]
1694
 
    use_dbus = server_settings[u"use_dbus"]
1695
 
    use_ipv6 = server_settings[u"use_ipv6"]
1696
 
    
1697
 
    if not debug:
1698
 
        syslogger.setLevel(logging.WARNING)
1699
 
        console.setLevel(logging.WARNING)
1700
 
    
1701
 
    if server_settings[u"servicename"] != u"Mandos":
1702
 
        syslogger.setFormatter(logging.Formatter
1703
 
                               (u'Mandos (%s) [%%(process)d]:'
1704
 
                                u' %%(levelname)s: %%(message)s'
1705
 
                                % server_settings[u"servicename"]))
1706
 
    
1707
 
    # Parse config file with clients
1708
 
    client_defaults = { u"timeout": u"1h",
1709
 
                        u"interval": u"5m",
1710
 
                        u"checker": u"fping -q -- %%(host)s",
1711
 
                        u"host": u"",
1712
 
                        u"approved_delay": u"0s",
1713
 
                        u"approved_duration": u"1s",
1714
 
                        }
1715
 
    client_config = configparser.SafeConfigParser(client_defaults)
1716
 
    client_config.read(os.path.join(server_settings[u"configdir"],
1717
 
                                    u"clients.conf"))
1718
 
    
1719
 
    global mandos_dbus_service
1720
 
    mandos_dbus_service = None
1721
 
    
1722
 
    tcp_server = MandosServer((server_settings[u"address"],
1723
 
                               server_settings[u"port"]),
1724
 
                              ClientHandler,
1725
 
                              interface=server_settings[u"interface"],
1726
 
                              use_ipv6=use_ipv6,
1727
 
                              gnutls_priority=
1728
 
                              server_settings[u"priority"],
1729
 
                              use_dbus=use_dbus)
1730
 
    pidfilename = u"/var/run/mandos.pid"
1731
 
    try:
1732
 
        pidfile = open(pidfilename, u"w")
1733
 
    except IOError:
1734
 
        logger.error(u"Could not open file %r", pidfilename)
1735
 
    
1736
 
    try:
1737
 
        uid = pwd.getpwnam(u"_mandos").pw_uid
1738
 
        gid = pwd.getpwnam(u"_mandos").pw_gid
1739
 
    except KeyError:
1740
 
        try:
1741
 
            uid = pwd.getpwnam(u"mandos").pw_uid
1742
 
            gid = pwd.getpwnam(u"mandos").pw_gid
1743
 
        except KeyError:
1744
 
            try:
1745
 
                uid = pwd.getpwnam(u"nobody").pw_uid
1746
 
                gid = pwd.getpwnam(u"nobody").pw_gid
1747
 
            except KeyError:
1748
 
                uid = 65534
1749
 
                gid = 65534
1750
 
    try:
1751
 
        os.setgid(gid)
1752
 
        os.setuid(uid)
1753
 
    except OSError, error:
1754
 
        if error[0] != errno.EPERM:
1755
 
            raise error
1756
 
    
1757
 
    # Enable all possible GnuTLS debugging
1758
 
    if debug:
1759
 
        # "Use a log level over 10 to enable all debugging options."
1760
 
        # - GnuTLS manual
1761
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1762
 
        
1763
 
        @gnutls.library.types.gnutls_log_func
1764
 
        def debug_gnutls(level, string):
1765
 
            logger.debug(u"GnuTLS: %s", string[:-1])
1766
 
        
1767
 
        (gnutls.library.functions
1768
 
         .gnutls_global_set_log_function(debug_gnutls))
1769
 
    
1770
 
    global main_loop
1771
 
    # 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
1772
589
    DBusGMainLoop(set_as_default=True )
1773
590
    main_loop = gobject.MainLoop()
1774
591
    bus = dbus.SystemBus()
1775
 
    # End of Avahi example code
1776
 
    if use_dbus:
1777
 
        try:
1778
 
            bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos",
1779
 
                                            bus, do_not_queue=True)
1780
 
        except dbus.exceptions.NameExistsException, e:
1781
 
            logger.error(unicode(e) + u", disabling D-Bus")
1782
 
            use_dbus = False
1783
 
            server_settings[u"use_dbus"] = False
1784
 
            tcp_server.use_dbus = False
1785
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1786
 
    service = AvahiService(name = server_settings[u"servicename"],
1787
 
                           servicetype = u"_mandos._tcp",
1788
 
                           protocol = protocol, bus = bus)
1789
 
    if server_settings["interface"]:
1790
 
        service.interface = (if_nametoindex
1791
 
                             (str(server_settings[u"interface"])))
1792
 
 
1793
 
    global multiprocessing_manager
1794
 
    multiprocessing_manager = multiprocessing.Manager()
1795
 
    
1796
 
    client_class = Client
1797
 
    if use_dbus:
1798
 
        client_class = functools.partial(ClientDBus, bus = bus)
1799
 
    def client_config_items(config, section):
1800
 
        special_settings = {
1801
 
            "approved_by_default":
1802
 
                lambda: config.getboolean(section,
1803
 
                                          "approved_by_default"),
1804
 
            }
1805
 
        for name, value in config.items(section):
1806
 
            try:
1807
 
                yield (name, special_settings[name]())
1808
 
            except KeyError:
1809
 
                yield (name, value)
1810
 
    
1811
 
    tcp_server.clients.update(set(
1812
 
            client_class(name = section,
1813
 
                         config= dict(client_config_items(
1814
 
                        client_config, section)))
1815
 
            for section in client_config.sections()))
1816
 
    if not tcp_server.clients:
1817
 
        logger.warning(u"No clients defined")
1818
 
    
1819
 
    if debug:
1820
 
        # Redirect stdin so all checkers get /dev/null
1821
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1822
 
        os.dup2(null, sys.stdin.fileno())
1823
 
        if null > 2:
1824
 
            os.close(null)
1825
 
    else:
1826
 
        # No console logging
1827
 
        logger.removeHandler(console)
1828
 
        # Close all input and output, do double fork, etc.
1829
 
        daemon()
1830
 
    
1831
 
    try:
1832
 
        with pidfile:
1833
 
            pid = os.getpid()
1834
 
            pidfile.write(str(pid) + "\n")
1835
 
        del pidfile
1836
 
    except IOError:
1837
 
        logger.error(u"Could not write to file %r with PID %d",
1838
 
                     pidfilename, pid)
1839
 
    except NameError:
1840
 
        # "pidfile" was never created
1841
 
        pass
1842
 
    del pidfilename
1843
 
    
1844
 
    if not debug:
1845
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1846
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1847
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1848
 
    
1849
 
    if use_dbus:
1850
 
        class MandosDBusService(dbus.service.Object):
1851
 
            """A D-Bus proxy object"""
1852
 
            def __init__(self):
1853
 
                dbus.service.Object.__init__(self, bus, u"/")
1854
 
            _interface = u"se.bsnet.fukt.Mandos"
1855
 
            
1856
 
            @dbus.service.signal(_interface, signature=u"o")
1857
 
            def ClientAdded(self, objpath):
1858
 
                "D-Bus signal"
1859
 
                pass
1860
 
            
1861
 
            @dbus.service.signal(_interface, signature=u"ss")
1862
 
            def ClientNotFound(self, fingerprint, address):
1863
 
                "D-Bus signal"
1864
 
                pass
1865
 
            
1866
 
            @dbus.service.signal(_interface, signature=u"os")
1867
 
            def ClientRemoved(self, objpath, name):
1868
 
                "D-Bus signal"
1869
 
                pass
1870
 
            
1871
 
            @dbus.service.method(_interface, out_signature=u"ao")
1872
 
            def GetAllClients(self):
1873
 
                "D-Bus method"
1874
 
                return dbus.Array(c.dbus_object_path
1875
 
                                  for c in tcp_server.clients)
1876
 
            
1877
 
            @dbus.service.method(_interface,
1878
 
                                 out_signature=u"a{oa{sv}}")
1879
 
            def GetAllClientsWithProperties(self):
1880
 
                "D-Bus method"
1881
 
                return dbus.Dictionary(
1882
 
                    ((c.dbus_object_path, c.GetAll(u""))
1883
 
                     for c in tcp_server.clients),
1884
 
                    signature=u"oa{sv}")
1885
 
            
1886
 
            @dbus.service.method(_interface, in_signature=u"o")
1887
 
            def RemoveClient(self, object_path):
1888
 
                "D-Bus method"
1889
 
                for c in tcp_server.clients:
1890
 
                    if c.dbus_object_path == object_path:
1891
 
                        tcp_server.clients.remove(c)
1892
 
                        c.remove_from_connection()
1893
 
                        # Don't signal anything except ClientRemoved
1894
 
                        c.disable(quiet=True)
1895
 
                        # Emit D-Bus signal
1896
 
                        self.ClientRemoved(object_path, c.name)
1897
 
                        return
1898
 
                raise KeyError(object_path)
1899
 
            
1900
 
            del _interface
1901
 
        
1902
 
        mandos_dbus_service = MandosDBusService()
1903
 
    
1904
 
    def cleanup():
1905
 
        "Cleanup function; run on exit"
1906
 
        service.cleanup()
1907
 
        
1908
 
        while tcp_server.clients:
1909
 
            client = tcp_server.clients.pop()
1910
 
            if use_dbus:
1911
 
                client.remove_from_connection()
1912
 
            client.disable_hook = None
1913
 
            # Don't signal anything except ClientRemoved
1914
 
            client.disable(quiet=True)
1915
 
            if use_dbus:
1916
 
                # Emit D-Bus signal
1917
 
                mandos_dbus_service.ClientRemoved(client.dbus_object_path,
1918
 
                                                  client.name)
1919
 
    
1920
 
    atexit.register(cleanup)
1921
 
    
1922
 
    for client in tcp_server.clients:
1923
 
        if use_dbus:
1924
 
            # Emit D-Bus signal
1925
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
1926
 
        client.enable()
1927
 
    
1928
 
    tcp_server.enable()
1929
 
    tcp_server.server_activate()
1930
 
    
1931
 
    # Find out what port we got
1932
 
    service.port = tcp_server.socket.getsockname()[1]
1933
 
    if use_ipv6:
1934
 
        logger.info(u"Now listening on address %r, port %d,"
1935
 
                    " flowinfo %d, scope_id %d"
1936
 
                    % tcp_server.socket.getsockname())
1937
 
    else:                       # IPv4
1938
 
        logger.info(u"Now listening on address %r, port %d"
1939
 
                    % tcp_server.socket.getsockname())
1940
 
    
1941
 
    #service.interface = tcp_server.socket.getsockname()[3]
1942
 
    
1943
 
    try:
1944
 
        # From the Avahi example code
1945
 
        try:
1946
 
            service.activate()
1947
 
        except dbus.exceptions.DBusException, error:
1948
 
            logger.critical(u"DBusException: %s", error)
1949
 
            cleanup()
1950
 
            sys.exit(1)
1951
 
        # End of Avahi example code
1952
 
        
1953
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1954
 
                             lambda *args, **kwargs:
1955
 
                             (tcp_server.handle_request
1956
 
                              (*args[2:], **kwargs) or True))
1957
 
        
1958
 
        logger.debug(u"Starting main loop")
 
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)
 
634
    try:
1959
635
        main_loop.run()
1960
 
    except AvahiError, error:
1961
 
        logger.critical(u"AvahiError: %s", error)
1962
 
        cleanup()
1963
 
        sys.exit(1)
1964
636
    except KeyboardInterrupt:
1965
 
        if debug:
1966
 
            print >> sys.stderr
1967
 
        logger.debug(u"Server received KeyboardInterrupt")
1968
 
    logger.debug(u"Server exiting")
1969
 
    # Must run before the D-Bus bus name gets deregistered
1970
 
    cleanup()
 
637
        print
 
638
    
 
639
    # Cleanup here
1971
640
 
1972
 
if __name__ == '__main__':
1973
 
    main()
 
641
    # From the Avahi server example code
 
642
    if not group is None:
 
643
        group.Free()
 
644
    # End of Avahi example code
 
645
    
 
646
    for client in clients:
 
647
        client.stop_hook = None
 
648
        client.stop()