/mandos/trunk

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

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#!/usr/bin/python
2
 
# -*- mode: python; coding: utf-8 -*-
3
 
4
 
# Mandos server - give out binary blobs to connecting clients.
5
 
6
 
# This program is partly derived from an example program for an Avahi
7
 
# service publisher, downloaded from
8
 
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add", "remove", "server_state_changed",
10
 
# "entry_group_state_changed", "cleanup", and "activate" in the
11
 
# "AvahiService" class, and some lines in "main".
12
 
13
 
# Everything else is
14
 
# Copyright © 2008,2009 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
 
from contextlib import closing
59
 
import struct
60
 
import fcntl
61
 
import functools
62
24
 
63
25
import dbus
64
 
import dbus.service
65
26
import gobject
66
27
import avahi
67
28
from dbus.mainloop.glib import DBusGMainLoop
68
29
import ctypes
69
 
import ctypes.util
70
 
 
71
 
try:
72
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
73
 
except AttributeError:
74
 
    try:
75
 
        from IN import SO_BINDTODEVICE
76
 
    except ImportError:
77
 
        SO_BINDTODEVICE = None
78
 
 
79
 
 
80
 
version = "1.0.11"
81
 
 
82
 
logger = logging.Logger(u'mandos')
83
 
syslogger = (logging.handlers.SysLogHandler
84
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
85
 
              address = "/dev/log"))
86
 
syslogger.setFormatter(logging.Formatter
87
 
                       (u'Mandos [%(process)d]: %(levelname)s:'
88
 
                        u' %(message)s'))
89
 
logger.addHandler(syslogger)
90
 
 
91
 
console = logging.StreamHandler()
92
 
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
93
 
                                       u' %(levelname)s:'
94
 
                                       u' %(message)s'))
95
 
logger.addHandler(console)
96
 
 
97
 
class AvahiError(Exception):
98
 
    def __init__(self, value, *args, **kwargs):
99
 
        self.value = value
100
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
101
 
    def __unicode__(self):
102
 
        return unicode(repr(self.value))
103
 
 
104
 
class AvahiServiceError(AvahiError):
105
 
    pass
106
 
 
107
 
class AvahiGroupError(AvahiError):
108
 
    pass
109
 
 
110
 
 
111
 
class AvahiService(object):
112
 
    """An Avahi (Zeroconf) service.
113
 
    
114
 
    Attributes:
115
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
116
 
               Used to optionally bind to the specified interface.
117
 
    name: string; Example: u'Mandos'
118
 
    type: string; Example: u'_mandos._tcp'.
119
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
120
 
    port: integer; what port to announce
121
 
    TXT: list of strings; TXT record for the service
122
 
    domain: string; Domain to publish on, default to .local if empty.
123
 
    host: string; Host to publish records for, default is localhost
124
 
    max_renames: integer; maximum number of renames
125
 
    rename_count: integer; counter so we only rename after collisions
126
 
                  a sensible number of times
127
 
    group: D-Bus Entry Group
128
 
    server: D-Bus Server
129
 
    bus: dbus.SystemBus()
130
 
    """
131
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
132
 
                 servicetype = None, port = None, TXT = None,
133
 
                 domain = u"", host = u"", max_renames = 32768,
134
 
                 protocol = avahi.PROTO_UNSPEC, bus = None):
135
 
        self.interface = interface
136
 
        self.name = name
137
 
        self.type = servicetype
138
 
        self.port = port
139
 
        self.TXT = TXT if TXT is not None else []
140
 
        self.domain = domain
141
 
        self.host = host
142
 
        self.rename_count = 0
143
 
        self.max_renames = max_renames
144
 
        self.protocol = protocol
145
 
        self.group = None       # our entry group
146
 
        self.server = None
147
 
        self.bus = bus
148
 
    def rename(self):
149
 
        """Derived from the Avahi example code"""
150
 
        if self.rename_count >= self.max_renames:
151
 
            logger.critical(u"No suitable Zeroconf service name found"
152
 
                            u" after %i retries, exiting.",
153
 
                            self.rename_count)
154
 
            raise AvahiServiceError(u"Too many renames")
155
 
        self.name = self.server.GetAlternativeServiceName(self.name)
156
 
        logger.info(u"Changing Zeroconf service name to %r ...",
157
 
                    unicode(self.name))
158
 
        syslogger.setFormatter(logging.Formatter
159
 
                               (u'Mandos (%s) [%%(process)d]:'
160
 
                                u' %%(levelname)s: %%(message)s'
161
 
                                % self.name))
162
 
        self.remove()
163
 
        self.add()
164
 
        self.rename_count += 1
165
 
    def remove(self):
166
 
        """Derived from the Avahi example code"""
167
 
        if self.group is not None:
168
 
            self.group.Reset()
169
 
    def add(self):
170
 
        """Derived from the Avahi example code"""
171
 
        if self.group is None:
172
 
            self.group = dbus.Interface(
173
 
                self.bus.get_object(avahi.DBUS_NAME,
174
 
                                    self.server.EntryGroupNew()),
175
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
176
 
            self.group.connect_to_signal('StateChanged',
177
 
                                         self.entry_group_state_changed)
178
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
179
 
                     self.name, self.type)
180
 
        self.group.AddService(
181
 
            self.interface,
182
 
            self.protocol,
183
 
            dbus.UInt32(0),     # flags
184
 
            self.name, self.type,
185
 
            self.domain, self.host,
186
 
            dbus.UInt16(self.port),
187
 
            avahi.string_array_to_txt_array(self.TXT))
188
 
        self.group.Commit()
189
 
    def entry_group_state_changed(self, state, error):
190
 
        """Derived from the Avahi example code"""
191
 
        logger.debug(u"Avahi state change: %i", state)
192
 
        
193
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
194
 
            logger.debug(u"Zeroconf service established.")
195
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
196
 
            logger.warning(u"Zeroconf service name collision.")
197
 
            self.rename()
198
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
199
 
            logger.critical(u"Avahi: Error in group state changed %s",
200
 
                            unicode(error))
201
 
            raise AvahiGroupError(u"State changed: %s"
202
 
                                  % unicode(error))
203
 
    def cleanup(self):
204
 
        """Derived from the Avahi example code"""
205
 
        if self.group is not None:
206
 
            self.group.Free()
207
 
            self.group = None
208
 
    def server_state_changed(self, state):
209
 
        """Derived from the Avahi example code"""
210
 
        if state == avahi.SERVER_COLLISION:
211
 
            logger.error(u"Zeroconf server name collision")
212
 
            self.remove()
213
 
        elif state == avahi.SERVER_RUNNING:
214
 
            self.add()
215
 
    def activate(self):
216
 
        """Derived from the Avahi example code"""
217
 
        if self.server is None:
218
 
            self.server = dbus.Interface(
219
 
                self.bus.get_object(avahi.DBUS_NAME,
220
 
                                    avahi.DBUS_PATH_SERVER),
221
 
                avahi.DBUS_INTERFACE_SERVER)
222
 
        self.server.connect_to_signal(u"StateChanged",
223
 
                                 self.server_state_changed)
224
 
        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
225
54
 
226
55
 
227
56
class Client(object):
228
57
    """A representation of a client host served by this server.
229
 
    
230
58
    Attributes:
231
 
    name:       string; from the config file, used in log messages and
232
 
                        D-Bus identifiers
 
59
    name:      string; from the config file, used in log messages
233
60
    fingerprint: string (40 or 32 hexadecimal digits); used to
234
61
                 uniquely identify the client
235
 
    secret:     bytestring; sent verbatim (over TLS) to client
236
 
    host:       string; available for use by the checker command
237
 
    created:    datetime.datetime(); (UTC) object creation
238
 
    last_enabled: datetime.datetime(); (UTC)
239
 
    enabled:    bool()
240
 
    last_checked_ok: datetime.datetime(); (UTC) or None
241
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
242
 
                                      until this client is invalid
243
 
    interval:   datetime.timedelta(); How often to start a new checker
244
 
    disable_hook:  If set, called by disable() as disable_hook(self)
245
 
    checker:    subprocess.Popen(); a running checker process used
246
 
                                    to see if the client lives.
247
 
                                    '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.
248
73
    checker_initiator_tag: a gobject event source tag, or None
249
 
    disable_initiator_tag:    - '' -
 
74
    stop_initiator_tag:    - '' -
250
75
    checker_callback_tag:  - '' -
251
76
    checker_command: string; External command which is run to check if
252
 
                     client lives.  %() expansions are done at
 
77
                     client lives.  %()s expansions are done at
253
78
                     runtime with vars(self) as dict, so that for
254
79
                     instance %(name)s can be used in the command.
255
 
    current_checker_command: string; current running checker_command
 
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: - '' -
256
85
    """
257
 
    
258
 
    @staticmethod
259
 
    def _datetime_to_milliseconds(dt):
260
 
        "Convert a datetime.datetime() to milliseconds"
261
 
        return ((dt.days * 24 * 60 * 60 * 1000)
262
 
                + (dt.seconds * 1000)
263
 
                + (dt.microseconds // 1000))
264
 
    
265
 
    def timeout_milliseconds(self):
266
 
        "Return the 'timeout' attribute in milliseconds"
267
 
        return self._datetime_to_milliseconds(self.timeout)
268
 
    
269
 
    def interval_milliseconds(self):
270
 
        "Return the 'interval' attribute in milliseconds"
271
 
        return self._datetime_to_milliseconds(self.interval)
272
 
    
273
 
    def __init__(self, name = None, disable_hook=None, config=None):
274
 
        """Note: the 'checker' key in 'config' sets the
275
 
        'checker_command' attribute and *not* the 'checker'
276
 
        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):
277
112
        self.name = name
278
 
        if config is None:
279
 
            config = {}
280
 
        logger.debug(u"Creating client %r", self.name)
281
 
        # Uppercase and remove spaces from fingerprint for later
282
 
        # comparison purposes with return value from the fingerprint()
283
 
        # function
284
 
        self.fingerprint = (config[u"fingerprint"].upper()
285
 
                            .replace(u" ", u""))
286
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
287
 
        if u"secret" in config:
288
 
            self.secret = config[u"secret"].decode(u"base64")
289
 
        elif u"secfile" in config:
290
 
            with closing(open(os.path.expanduser
291
 
                              (os.path.expandvars
292
 
                               (config[u"secfile"])))) as secfile:
293
 
                self.secret = secfile.read()
294
 
        else:
295
 
            raise TypeError(u"No secret or secfile for client %s"
296
 
                            % self.name)
297
 
        self.host = config.get(u"host", u"")
298
 
        self.created = datetime.datetime.utcnow()
299
 
        self.enabled = False
300
 
        self.last_enabled = None
301
 
        self.last_checked_ok = None
302
 
        self.timeout = string_to_delta(config[u"timeout"])
303
 
        self.interval = string_to_delta(config[u"interval"])
304
 
        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
305
138
        self.checker = None
306
139
        self.checker_initiator_tag = None
307
 
        self.disable_initiator_tag = None
 
140
        self.stop_initiator_tag = None
308
141
        self.checker_callback_tag = None
309
 
        self.checker_command = config[u"checker"]
310
 
        self.current_checker_command = None
311
 
        self.last_connect = None
312
 
    
313
 
    def enable(self):
314
 
        """Start this client's checker and timeout hooks"""
315
 
        if getattr(self, u"enabled", False):
316
 
            # Already enabled
317
 
            return
318
 
        self.last_enabled = datetime.datetime.utcnow()
 
142
        self.check_command = checker
 
143
    def start(self):
 
144
        """Start this clients checker and timeout hooks"""
319
145
        # Schedule a new checker to be started an 'interval' from now,
320
146
        # and every interval from then on.
321
 
        self.checker_initiator_tag = (gobject.timeout_add
322
 
                                      (self.interval_milliseconds(),
323
 
                                       self.start_checker))
 
147
        self.checker_initiator_tag = gobject.timeout_add\
 
148
                                     (self._interval_milliseconds,
 
149
                                      self.start_checker)
324
150
        # Also start a new checker *right now*.
325
151
        self.start_checker()
326
 
        # Schedule a disable() when 'timeout' has passed
327
 
        self.disable_initiator_tag = (gobject.timeout_add
328
 
                                   (self.timeout_milliseconds(),
329
 
                                    self.disable))
330
 
        self.enabled = True
331
 
    
332
 
    def disable(self):
333
 
        """Disable this client."""
334
 
        if not getattr(self, "enabled", False):
335
 
            return False
336
 
        logger.info(u"Disabling client %s", self.name)
337
 
        if getattr(self, u"disable_initiator_tag", False):
338
 
            gobject.source_remove(self.disable_initiator_tag)
339
 
            self.disable_initiator_tag = None
340
 
        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:
341
166
            gobject.source_remove(self.checker_initiator_tag)
342
167
            self.checker_initiator_tag = None
343
168
        self.stop_checker()
344
 
        if self.disable_hook:
345
 
            self.disable_hook(self)
346
 
        self.enabled = False
 
169
        if self.stop_hook:
 
170
            self.stop_hook(self)
347
171
        # Do not run this again if called by a gobject.timeout_add
348
172
        return False
349
 
    
350
173
    def __del__(self):
351
 
        self.disable_hook = None
352
 
        self.disable()
353
 
    
354
 
    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):
355
185
        """The checker has completed, so take appropriate actions."""
356
 
        self.checker_callback_tag = None
357
 
        self.checker = None
358
 
        if os.WIFEXITED(condition):
359
 
            exitstatus = os.WEXITSTATUS(condition)
360
 
            if exitstatus == 0:
361
 
                logger.info(u"Checker for %(name)s succeeded",
362
 
                            vars(self))
363
 
                self.checked_ok()
364
 
            else:
365
 
                logger.info(u"Checker for %(name)s failed",
366
 
                            vars(self))
367
 
        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):
368
197
            logger.warning(u"Checker for %(name)s crashed?",
369
198
                           vars(self))
370
 
    
371
 
    def checked_ok(self):
372
 
        """Bump up the timeout for this client.
373
 
        
374
 
        This should only be called when the client has been seen,
375
 
        alive and well.
376
 
        """
377
 
        self.last_checked_ok = datetime.datetime.utcnow()
378
 
        gobject.source_remove(self.disable_initiator_tag)
379
 
        self.disable_initiator_tag = (gobject.timeout_add
380
 
                                      (self.timeout_milliseconds(),
381
 
                                       self.disable))
382
 
    
 
199
        else:
 
200
            logger.debug(u"Checker for %(name)s failed",
 
201
                         vars(self))
 
202
            self.checker = None
 
203
        self.checker_callback_tag = None
383
204
    def start_checker(self):
384
205
        """Start a new checker subprocess if one is not running.
385
 
        
386
206
        If a checker already exists, leave it running and do
387
207
        nothing."""
388
 
        # The reason for not killing a running checker is that if we
389
 
        # did that, then if a checker (for some reason) started
390
 
        # running slowly and taking more than 'interval' time, the
391
 
        # client would inevitably timeout, since no checker would get
392
 
        # a chance to run to completion.  If we instead leave running
393
 
        # checkers alone, the checker would have to take more time
394
 
        # than 'timeout' for the client to be declared invalid, which
395
 
        # is as it should be.
396
 
        
397
 
        # If a checker exists, make sure it is not a zombie
398
 
        if self.checker is not None:
399
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
400
 
            if pid:
401
 
                logger.warning(u"Checker was a zombie")
402
 
                gobject.source_remove(self.checker_callback_tag)
403
 
                self.checker_callback(pid, status,
404
 
                                      self.current_checker_command)
405
 
        # Start a new checker if needed
406
208
        if self.checker is None:
 
209
            logger.debug(u"Starting checker for %s",
 
210
                         self.name)
407
211
            try:
408
 
                # In case checker_command has exactly one % operator
409
 
                command = self.checker_command % self.host
 
212
                command = self.check_command % self.fqdn
410
213
            except TypeError:
411
 
                # Escape attributes for the shell
412
 
                escaped_attrs = dict((key,
413
 
                                      re.escape(unicode(str(val),
414
 
                                                        errors=
415
 
                                                        u'replace')))
 
214
                escaped_attrs = dict((key, re.escape(str(val)))
416
215
                                     for key, val in
417
216
                                     vars(self).iteritems())
418
217
                try:
419
 
                    command = self.checker_command % escaped_attrs
 
218
                    command = self.check_command % escaped_attrs
420
219
                except TypeError, error:
421
 
                    logger.error(u'Could not format string "%s":'
422
 
                                 u' %s', self.checker_command, error)
 
220
                    logger.critical(u'Could not format string "%s": %s',
 
221
                                    self.check_command, error)
423
222
                    return True # Try again later
424
 
            self.current_checker_command = command
425
223
            try:
426
 
                logger.info(u"Starting checker %r for %s",
427
 
                            command, self.name)
428
 
                # We don't need to redirect stdout and stderr, since
429
 
                # in normal mode, that is already done by daemon(),
430
 
                # and in debug mode we don't want to.  (Stdin is
431
 
                # always replaced by /dev/null.)
432
 
                self.checker = subprocess.Popen(command,
433
 
                                                close_fds=True,
434
 
                                                shell=True, cwd=u"/")
435
 
                self.checker_callback_tag = (gobject.child_watch_add
436
 
                                             (self.checker.pid,
437
 
                                              self.checker_callback,
438
 
                                              data=command))
439
 
                # The checker may have completed before the gobject
440
 
                # watch was added.  Check for this.
441
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
442
 
                if pid:
443
 
                    gobject.source_remove(self.checker_callback_tag)
444
 
                    self.checker_callback(pid, status, command)
445
 
            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:
446
234
                logger.error(u"Failed to start subprocess: %s",
447
235
                             error)
448
236
        # Re-run this periodically if run by gobject.timeout_add
449
237
        return True
450
 
    
451
238
    def stop_checker(self):
452
239
        """Force the checker process, if any, to stop."""
453
 
        if self.checker_callback_tag:
454
 
            gobject.source_remove(self.checker_callback_tag)
455
 
            self.checker_callback_tag = None
456
 
        if getattr(self, u"checker", None) is None:
 
240
        if not hasattr(self, "checker") or self.checker is None:
457
241
            return
458
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
459
 
        try:
460
 
            os.kill(self.checker.pid, signal.SIGTERM)
461
 
            #os.sleep(0.5)
462
 
            #if self.checker.poll() is None:
463
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
464
 
        except OSError, error:
465
 
            if error.errno != errno.ESRCH: # No such process
466
 
                raise
 
242
        gobject.source_remove(self.checker_callback_tag)
 
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)
467
247
        self.checker = None
468
 
    
469
 
    def still_valid(self):
 
248
    def still_valid(self, now=None):
470
249
        """Has the timeout not yet passed for this client?"""
471
 
        if not getattr(self, u"enabled", False):
472
 
            return False
473
 
        now = datetime.datetime.utcnow()
474
 
        if self.last_checked_ok is None:
 
250
        if now is None:
 
251
            now = datetime.datetime.now()
 
252
        if self.last_seen is None:
475
253
            return now < (self.created + self.timeout)
476
254
        else:
477
 
            return now < (self.last_checked_ok + self.timeout)
478
 
 
479
 
 
480
 
class ClientDBus(Client, dbus.service.Object):
481
 
    """A Client class using D-Bus
482
 
    
483
 
    Attributes:
484
 
    dbus_object_path: dbus.ObjectPath
485
 
    bus: dbus.SystemBus()
486
 
    """
487
 
    # dbus.service.Object doesn't use super(), so we can't either.
488
 
    
489
 
    def __init__(self, bus = None, *args, **kwargs):
490
 
        self.bus = bus
491
 
        Client.__init__(self, *args, **kwargs)
492
 
        # Only now, when this client is initialized, can it show up on
493
 
        # the D-Bus
494
 
        self.dbus_object_path = (dbus.ObjectPath
495
 
                                 (u"/clients/"
496
 
                                  + self.name.replace(u".", u"_")))
497
 
        dbus.service.Object.__init__(self, self.bus,
498
 
                                     self.dbus_object_path)
499
 
    
500
 
    @staticmethod
501
 
    def _datetime_to_dbus(dt, variant_level=0):
502
 
        """Convert a UTC datetime.datetime() to a D-Bus type."""
503
 
        return dbus.String(dt.isoformat(),
504
 
                           variant_level=variant_level)
505
 
    
506
 
    def enable(self):
507
 
        oldstate = getattr(self, u"enabled", False)
508
 
        r = Client.enable(self)
509
 
        if oldstate != self.enabled:
510
 
            # Emit D-Bus signals
511
 
            self.PropertyChanged(dbus.String(u"enabled"),
512
 
                                 dbus.Boolean(True, variant_level=1))
513
 
            self.PropertyChanged(
514
 
                dbus.String(u"last_enabled"),
515
 
                self._datetime_to_dbus(self.last_enabled,
516
 
                                       variant_level=1))
517
 
        return r
518
 
    
519
 
    def disable(self, signal = True):
520
 
        oldstate = getattr(self, u"enabled", False)
521
 
        r = Client.disable(self)
522
 
        if signal and oldstate != self.enabled:
523
 
            # Emit D-Bus signal
524
 
            self.PropertyChanged(dbus.String(u"enabled"),
525
 
                                 dbus.Boolean(False, variant_level=1))
526
 
        return r
527
 
    
528
 
    def __del__(self, *args, **kwargs):
529
 
        try:
530
 
            self.remove_from_connection()
531
 
        except LookupError:
532
 
            pass
533
 
        if hasattr(dbus.service.Object, u"__del__"):
534
 
            dbus.service.Object.__del__(self, *args, **kwargs)
535
 
        Client.__del__(self, *args, **kwargs)
536
 
    
537
 
    def checker_callback(self, pid, condition, command,
538
 
                         *args, **kwargs):
539
 
        self.checker_callback_tag = None
540
 
        self.checker = None
541
 
        # Emit D-Bus signal
542
 
        self.PropertyChanged(dbus.String(u"checker_running"),
543
 
                             dbus.Boolean(False, variant_level=1))
544
 
        if os.WIFEXITED(condition):
545
 
            exitstatus = os.WEXITSTATUS(condition)
546
 
            # Emit D-Bus signal
547
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
548
 
                                  dbus.Int64(condition),
549
 
                                  dbus.String(command))
550
 
        else:
551
 
            # Emit D-Bus signal
552
 
            self.CheckerCompleted(dbus.Int16(-1),
553
 
                                  dbus.Int64(condition),
554
 
                                  dbus.String(command))
555
 
        
556
 
        return Client.checker_callback(self, pid, condition, command,
557
 
                                       *args, **kwargs)
558
 
    
559
 
    def checked_ok(self, *args, **kwargs):
560
 
        r = Client.checked_ok(self, *args, **kwargs)
561
 
        # Emit D-Bus signal
562
 
        self.PropertyChanged(
563
 
            dbus.String(u"last_checked_ok"),
564
 
            (self._datetime_to_dbus(self.last_checked_ok,
565
 
                                    variant_level=1)))
566
 
        return r
567
 
    
568
 
    def start_checker(self, *args, **kwargs):
569
 
        old_checker = self.checker
570
 
        if self.checker is not None:
571
 
            old_checker_pid = self.checker.pid
572
 
        else:
573
 
            old_checker_pid = None
574
 
        r = Client.start_checker(self, *args, **kwargs)
575
 
        # Only if new checker process was started
576
 
        if (self.checker is not None
577
 
            and old_checker_pid != self.checker.pid):
578
 
            # Emit D-Bus signal
579
 
            self.CheckerStarted(self.current_checker_command)
580
 
            self.PropertyChanged(
581
 
                dbus.String(u"checker_running"),
582
 
                dbus.Boolean(True, variant_level=1))
583
 
        return r
584
 
    
585
 
    def stop_checker(self, *args, **kwargs):
586
 
        old_checker = getattr(self, u"checker", None)
587
 
        r = Client.stop_checker(self, *args, **kwargs)
588
 
        if (old_checker is not None
589
 
            and getattr(self, u"checker", None) is None):
590
 
            self.PropertyChanged(dbus.String(u"checker_running"),
591
 
                                 dbus.Boolean(False, variant_level=1))
592
 
        return r
593
 
    
594
 
    ## D-Bus methods & signals
595
 
    _interface = u"se.bsnet.fukt.Mandos.Client"
596
 
    
597
 
    # CheckedOK - method
598
 
    @dbus.service.method(_interface)
599
 
    def CheckedOK(self):
600
 
        return self.checked_ok()
601
 
    
602
 
    # CheckerCompleted - signal
603
 
    @dbus.service.signal(_interface, signature=u"nxs")
604
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
605
 
        "D-Bus signal"
606
 
        pass
607
 
    
608
 
    # CheckerStarted - signal
609
 
    @dbus.service.signal(_interface, signature=u"s")
610
 
    def CheckerStarted(self, command):
611
 
        "D-Bus signal"
612
 
        pass
613
 
    
614
 
    # GetAllProperties - method
615
 
    @dbus.service.method(_interface, out_signature=u"a{sv}")
616
 
    def GetAllProperties(self):
617
 
        "D-Bus method"
618
 
        return dbus.Dictionary({
619
 
                dbus.String(u"name"):
620
 
                    dbus.String(self.name, variant_level=1),
621
 
                dbus.String(u"fingerprint"):
622
 
                    dbus.String(self.fingerprint, variant_level=1),
623
 
                dbus.String(u"host"):
624
 
                    dbus.String(self.host, variant_level=1),
625
 
                dbus.String(u"created"):
626
 
                    self._datetime_to_dbus(self.created,
627
 
                                           variant_level=1),
628
 
                dbus.String(u"last_enabled"):
629
 
                    (self._datetime_to_dbus(self.last_enabled,
630
 
                                            variant_level=1)
631
 
                     if self.last_enabled is not None
632
 
                     else dbus.Boolean(False, variant_level=1)),
633
 
                dbus.String(u"enabled"):
634
 
                    dbus.Boolean(self.enabled, variant_level=1),
635
 
                dbus.String(u"last_checked_ok"):
636
 
                    (self._datetime_to_dbus(self.last_checked_ok,
637
 
                                            variant_level=1)
638
 
                     if self.last_checked_ok is not None
639
 
                     else dbus.Boolean (False, variant_level=1)),
640
 
                dbus.String(u"timeout"):
641
 
                    dbus.UInt64(self.timeout_milliseconds(),
642
 
                                variant_level=1),
643
 
                dbus.String(u"interval"):
644
 
                    dbus.UInt64(self.interval_milliseconds(),
645
 
                                variant_level=1),
646
 
                dbus.String(u"checker"):
647
 
                    dbus.String(self.checker_command,
648
 
                                variant_level=1),
649
 
                dbus.String(u"checker_running"):
650
 
                    dbus.Boolean(self.checker is not None,
651
 
                                 variant_level=1),
652
 
                dbus.String(u"object_path"):
653
 
                    dbus.ObjectPath(self.dbus_object_path,
654
 
                                    variant_level=1)
655
 
                }, signature=u"sv")
656
 
    
657
 
    # IsStillValid - method
658
 
    @dbus.service.method(_interface, out_signature=u"b")
659
 
    def IsStillValid(self):
660
 
        return self.still_valid()
661
 
    
662
 
    # PropertyChanged - signal
663
 
    @dbus.service.signal(_interface, signature=u"sv")
664
 
    def PropertyChanged(self, property, value):
665
 
        "D-Bus signal"
666
 
        pass
667
 
    
668
 
    # ReceivedSecret - signal
669
 
    @dbus.service.signal(_interface)
670
 
    def ReceivedSecret(self):
671
 
        "D-Bus signal"
672
 
        pass
673
 
    
674
 
    # Rejected - signal
675
 
    @dbus.service.signal(_interface)
676
 
    def Rejected(self):
677
 
        "D-Bus signal"
678
 
        pass
679
 
    
680
 
    # SetChecker - method
681
 
    @dbus.service.method(_interface, in_signature=u"s")
682
 
    def SetChecker(self, checker):
683
 
        "D-Bus setter method"
684
 
        self.checker_command = checker
685
 
        # Emit D-Bus signal
686
 
        self.PropertyChanged(dbus.String(u"checker"),
687
 
                             dbus.String(self.checker_command,
688
 
                                         variant_level=1))
689
 
    
690
 
    # SetHost - method
691
 
    @dbus.service.method(_interface, in_signature=u"s")
692
 
    def SetHost(self, host):
693
 
        "D-Bus setter method"
694
 
        self.host = host
695
 
        # Emit D-Bus signal
696
 
        self.PropertyChanged(dbus.String(u"host"),
697
 
                             dbus.String(self.host, variant_level=1))
698
 
    
699
 
    # SetInterval - method
700
 
    @dbus.service.method(_interface, in_signature=u"t")
701
 
    def SetInterval(self, milliseconds):
702
 
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
703
 
        # Emit D-Bus signal
704
 
        self.PropertyChanged(dbus.String(u"interval"),
705
 
                             (dbus.UInt64(self.interval_milliseconds(),
706
 
                                          variant_level=1)))
707
 
    
708
 
    # SetSecret - method
709
 
    @dbus.service.method(_interface, in_signature=u"ay",
710
 
                         byte_arrays=True)
711
 
    def SetSecret(self, secret):
712
 
        "D-Bus setter method"
713
 
        self.secret = str(secret)
714
 
    
715
 
    # SetTimeout - method
716
 
    @dbus.service.method(_interface, in_signature=u"t")
717
 
    def SetTimeout(self, milliseconds):
718
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
719
 
        # Emit D-Bus signal
720
 
        self.PropertyChanged(dbus.String(u"timeout"),
721
 
                             (dbus.UInt64(self.timeout_milliseconds(),
722
 
                                          variant_level=1)))
723
 
    
724
 
    # Enable - method
725
 
    @dbus.service.method(_interface)
726
 
    def Enable(self):
727
 
        "D-Bus method"
728
 
        self.enable()
729
 
    
730
 
    # StartChecker - method
731
 
    @dbus.service.method(_interface)
732
 
    def StartChecker(self):
733
 
        "D-Bus method"
734
 
        self.start_checker()
735
 
    
736
 
    # Disable - method
737
 
    @dbus.service.method(_interface)
738
 
    def Disable(self):
739
 
        "D-Bus method"
740
 
        self.disable()
741
 
    
742
 
    # StopChecker - method
743
 
    @dbus.service.method(_interface)
744
 
    def StopChecker(self):
745
 
        self.stop_checker()
746
 
    
747
 
    del _interface
748
 
 
749
 
 
750
 
class ClientHandler(socketserver.BaseRequestHandler, object):
751
 
    """A class to handle client connections.
752
 
    
753
 
    Instantiated once for each connection to handle it.
 
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.
754
307
    Note: This will run in its own forked process."""
755
308
    
756
309
    def handle(self):
757
 
        logger.info(u"TCP connection from: %s",
758
 
                    unicode(self.client_address))
759
 
        logger.debug(u"IPC Pipe FD: %d", self.server.pipe[1])
760
 
        # Open IPC pipe to parent process
761
 
        with closing(os.fdopen(self.server.pipe[1], u"w", 1)) as ipc:
762
 
            session = (gnutls.connection
763
 
                       .ClientSession(self.request,
764
 
                                      gnutls.connection
765
 
                                      .X509Credentials()))
766
 
            
767
 
            line = self.request.makefile().readline()
768
 
            logger.debug(u"Protocol version: %r", line)
769
 
            try:
770
 
                if int(line.strip().split()[0]) > 1:
771
 
                    raise RuntimeError
772
 
            except (ValueError, IndexError, RuntimeError), error:
773
 
                logger.error(u"Unknown protocol version: %s", error)
774
 
                return
775
 
            
776
 
            # Note: gnutls.connection.X509Credentials is really a
777
 
            # generic GnuTLS certificate credentials object so long as
778
 
            # no X.509 keys are added to it.  Therefore, we can use it
779
 
            # here despite using OpenPGP certificates.
780
 
            
781
 
            #priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
782
 
            #                      u"+AES-256-CBC", u"+SHA1",
783
 
            #                      u"+COMP-NULL", u"+CTYPE-OPENPGP",
784
 
            #                      u"+DHE-DSS"))
785
 
            # Use a fallback default, since this MUST be set.
786
 
            priority = self.server.gnutls_priority
787
 
            if priority is None:
788
 
                priority = u"NORMAL"
789
 
            (gnutls.library.functions
790
 
             .gnutls_priority_set_direct(session._c_object,
791
 
                                         priority, None))
792
 
            
793
 
            try:
794
 
                session.handshake()
795
 
            except gnutls.errors.GNUTLSError, error:
796
 
                logger.warning(u"Handshake failed: %s", error)
797
 
                # Do not run session.bye() here: the session is not
798
 
                # established.  Just abandon the request.
799
 
                return
800
 
            logger.debug(u"Handshake succeeded")
801
 
            try:
802
 
                fpr = self.fingerprint(self.peer_certificate(session))
803
 
            except (TypeError, gnutls.errors.GNUTLSError), error:
804
 
                logger.warning(u"Bad certificate: %s", error)
805
 
                session.bye()
806
 
                return
807
 
            logger.debug(u"Fingerprint: %s", fpr)
808
 
            
809
 
            for c in self.server.clients:
810
 
                if c.fingerprint == fpr:
811
 
                    client = c
812
 
                    break
 
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))
813
350
            else:
814
 
                ipc.write(u"NOTFOUND %s %s\n"
815
 
                          % (fpr, unicode(self.client_address)))
816
 
                session.bye()
817
 
                return
818
 
            # Have to check if client.still_valid(), since it is
819
 
            # possible that the client timed out while establishing
820
 
            # the GnuTLS session.
821
 
            if not client.still_valid():
822
 
                ipc.write(u"INVALID %s\n" % client.name)
823
 
                session.bye()
824
 
                return
825
 
            ipc.write(u"SENDING %s\n" % client.name)
826
 
            sent_size = 0
827
 
            while sent_size < len(client.secret):
828
 
                sent = session.send(client.secret[sent_size:])
829
 
                logger.debug(u"Sent: %d, remaining: %d",
830
 
                             sent, len(client.secret)
831
 
                             - (sent_size + sent))
832
 
                sent_size += sent
 
351
                logger.debug(u"Client not found for fingerprint: %s",
 
352
                             fpr)
833
353
            session.bye()
834
 
    
835
 
    @staticmethod
836
 
    def peer_certificate(session):
837
 
        "Return the peer's OpenPGP certificate as a bytestring"
838
 
        # If not an OpenPGP certificate...
839
 
        if (gnutls.library.functions
840
 
            .gnutls_certificate_type_get(session._c_object)
841
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
842
 
            # ...do the normal thing
843
 
            return session.peer_certificate
844
 
        list_size = ctypes.c_uint(1)
845
 
        cert_list = (gnutls.library.functions
846
 
                     .gnutls_certificate_get_peers
847
 
                     (session._c_object, ctypes.byref(list_size)))
848
 
        if not bool(cert_list) and list_size.value != 0:
849
 
            raise gnutls.errors.GNUTLSError(u"error getting peer"
850
 
                                            u" certificate")
851
 
        if list_size.value == 0:
852
 
            return None
853
 
        cert = cert_list[0]
854
 
        return ctypes.string_at(cert.data, cert.size)
855
 
    
856
 
    @staticmethod
857
 
    def fingerprint(openpgp):
858
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
859
 
        # New GnuTLS "datum" with the OpenPGP public key
860
 
        datum = (gnutls.library.types
861
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
862
 
                                             ctypes.POINTER
863
 
                                             (ctypes.c_ubyte)),
864
 
                                 ctypes.c_uint(len(openpgp))))
865
 
        # New empty GnuTLS certificate
866
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
867
 
        (gnutls.library.functions
868
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
869
 
        # Import the OpenPGP public key into the certificate
870
 
        (gnutls.library.functions
871
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
872
 
                                    gnutls.library.constants
873
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
874
 
        # Verify the self signature in the key
875
 
        crtverify = ctypes.c_uint()
876
 
        (gnutls.library.functions
877
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
878
 
                                         ctypes.byref(crtverify)))
879
 
        if crtverify.value != 0:
880
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
881
 
            raise (gnutls.errors.CertificateSecurityError
882
 
                   (u"Verify failed"))
883
 
        # New buffer for the fingerprint
884
 
        buf = ctypes.create_string_buffer(20)
885
 
        buf_len = ctypes.c_size_t()
886
 
        # Get the fingerprint from the certificate into the buffer
887
 
        (gnutls.library.functions
888
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
889
 
                                             ctypes.byref(buf_len)))
890
 
        # Deinit the certificate
891
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
892
 
        # Convert the buffer to a Python bytestring
893
 
        fpr = ctypes.string_at(buf, buf_len.value)
894
 
        # Convert the bytestring to hexadecimal notation
895
 
        hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
896
 
        return hex_fpr
897
 
 
898
 
 
899
 
class ForkingMixInWithPipe(socketserver.ForkingMixIn, object):
900
 
    """Like socketserver.ForkingMixIn, but also pass a pipe."""
901
 
    def process_request(self, request, client_address):
902
 
        """Overrides and wraps the original process_request().
903
 
        
904
 
        This function creates a new pipe in self.pipe
905
 
        """
906
 
        self.pipe = os.pipe()
907
 
        super(ForkingMixInWithPipe,
908
 
              self).process_request(request, client_address)
909
 
        os.close(self.pipe[1])  # close write end
910
 
        self.add_pipe(self.pipe[0])
911
 
    def add_pipe(self, pipe):
912
 
        """Dummy function; override as necessary"""
913
 
        os.close(pipe)
914
 
 
915
 
 
916
 
class IPv6_TCPServer(ForkingMixInWithPipe,
917
 
                     socketserver.TCPServer, object):
918
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
919
 
    
 
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.
920
367
    Attributes:
921
 
        enabled:        Boolean; whether this server is activated yet
922
 
        interface:      None or a network interface name (string)
923
 
        use_ipv6:       Boolean; to use IPv6 or not
 
368
        options:        Command line options
 
369
        clients:        Set() of Client objects
924
370
    """
925
 
    def __init__(self, server_address, RequestHandlerClass,
926
 
                 interface=None, use_ipv6=True):
927
 
        self.interface = interface
928
 
        if use_ipv6:
929
 
            self.address_family = socket.AF_INET6
930
 
        socketserver.TCPServer.__init__(self, server_address,
931
 
                                        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)
932
380
    def server_bind(self):
933
381
        """This overrides the normal server_bind() function
934
382
        to bind to an interface if one was specified, and also NOT to
935
383
        bind to an address or port if they were not specified."""
936
 
        if self.interface is not None:
937
 
            if SO_BINDTODEVICE is None:
938
 
                logger.error(u"SO_BINDTODEVICE does not exist;"
939
 
                             u" cannot bind to interface %s",
940
 
                             self.interface)
941
 
            else:
942
 
                try:
943
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
944
 
                                           SO_BINDTODEVICE,
945
 
                                           str(self.interface
946
 
                                               + u'\0'))
947
 
                except socket.error, error:
948
 
                    if error[0] == errno.EPERM:
949
 
                        logger.error(u"No permission to"
950
 
                                     u" bind to interface %s",
951
 
                                     self.interface)
952
 
                    elif error[0] == errno.ENOPROTOOPT:
953
 
                        logger.error(u"SO_BINDTODEVICE not available;"
954
 
                                     u" cannot bind to interface %s",
955
 
                                     self.interface)
956
 
                    else:
957
 
                        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
958
399
        # Only bind(2) the socket if we really need to.
959
400
        if self.server_address[0] or self.server_address[1]:
960
401
            if not self.server_address[0]:
961
 
                if self.address_family == socket.AF_INET6:
962
 
                    any_address = u"::" # in6addr_any
963
 
                else:
964
 
                    any_address = socket.INADDR_ANY
965
 
                self.server_address = (any_address,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
966
404
                                       self.server_address[1])
967
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
968
406
                self.server_address = (self.server_address[0],
969
407
                                       0)
970
 
#                 if self.interface:
971
 
#                     self.server_address = (self.server_address[0],
972
 
#                                            0, # port
973
 
#                                            0, # flowinfo
974
 
#                                            if_nametoindex
975
 
#                                            (self.interface))
976
 
            return socketserver.TCPServer.server_bind(self)
977
 
 
978
 
 
979
 
class MandosServer(IPv6_TCPServer):
980
 
    """Mandos server.
981
 
    
982
 
    Attributes:
983
 
        clients:        set of Client objects
984
 
        gnutls_priority GnuTLS priority string
985
 
        use_dbus:       Boolean; to emit D-Bus signals or not
986
 
        clients:        set of Client objects
987
 
        gnutls_priority GnuTLS priority string
988
 
        use_dbus:       Boolean; to emit D-Bus signals or not
989
 
    
990
 
    Assumes a gobject.MainLoop event loop.
991
 
    """
992
 
    def __init__(self, server_address, RequestHandlerClass,
993
 
                 interface=None, use_ipv6=True, clients=None,
994
 
                 gnutls_priority=None, use_dbus=True):
995
 
        self.enabled = False
996
 
        self.clients = clients
997
 
        if self.clients is None:
998
 
            self.clients = set()
999
 
        self.use_dbus = use_dbus
1000
 
        self.gnutls_priority = gnutls_priority
1001
 
        IPv6_TCPServer.__init__(self, server_address,
1002
 
                                RequestHandlerClass,
1003
 
                                interface = interface,
1004
 
                                use_ipv6 = use_ipv6)
1005
 
    def server_activate(self):
1006
 
        if self.enabled:
1007
 
            return socketserver.TCPServer.server_activate(self)
1008
 
    def enable(self):
1009
 
        self.enabled = True
1010
 
    def add_pipe(self, pipe):
1011
 
        # Call "handle_ipc" for both data and EOF events
1012
 
        gobject.io_add_watch(pipe, gobject.IO_IN | gobject.IO_HUP,
1013
 
                             self.handle_ipc)
1014
 
    def handle_ipc(self, source, condition, file_objects={}):
1015
 
        condition_names = {
1016
 
            gobject.IO_IN: u"IN",   # There is data to read.
1017
 
            gobject.IO_OUT: u"OUT", # Data can be written (without
1018
 
                                    # blocking).
1019
 
            gobject.IO_PRI: u"PRI", # There is urgent data to read.
1020
 
            gobject.IO_ERR: u"ERR", # Error condition.
1021
 
            gobject.IO_HUP: u"HUP"  # Hung up (the connection has been
1022
 
                                    # broken, usually for pipes and
1023
 
                                    # sockets).
1024
 
            }
1025
 
        conditions_string = ' | '.join(name
1026
 
                                       for cond, name in
1027
 
                                       condition_names.iteritems()
1028
 
                                       if cond & condition)
1029
 
        logger.debug(u"Handling IPC: FD = %d, condition = %s", source,
1030
 
                     conditions_string)
1031
 
        
1032
 
        # Turn the pipe file descriptor into a Python file object
1033
 
        if source not in file_objects:
1034
 
            file_objects[source] = os.fdopen(source, u"r", 1)
1035
 
        
1036
 
        # Read a line from the file object
1037
 
        cmdline = file_objects[source].readline()
1038
 
        if not cmdline:             # Empty line means end of file
1039
 
            # close the IPC pipe
1040
 
            file_objects[source].close()
1041
 
            del file_objects[source]
1042
 
            
1043
 
            # Stop calling this function
1044
 
            return False
1045
 
        
1046
 
        logger.debug(u"IPC command: %r", cmdline)
1047
 
        
1048
 
        # Parse and act on command
1049
 
        cmd, args = cmdline.rstrip(u"\r\n").split(None, 1)
1050
 
        
1051
 
        if cmd == u"NOTFOUND":
1052
 
            logger.warning(u"Client not found for fingerprint: %s",
1053
 
                           args)
1054
 
            if self.use_dbus:
1055
 
                # Emit D-Bus signal
1056
 
                mandos_dbus_service.ClientNotFound(args)
1057
 
        elif cmd == u"INVALID":
1058
 
            for client in self.clients:
1059
 
                if client.name == args:
1060
 
                    logger.warning(u"Client %s is invalid", args)
1061
 
                    if self.use_dbus:
1062
 
                        # Emit D-Bus signal
1063
 
                        client.Rejected()
1064
 
                    break
1065
 
            else:
1066
 
                logger.error(u"Unknown client %s is invalid", args)
1067
 
        elif cmd == u"SENDING":
1068
 
            for client in self.clients:
1069
 
                if client.name == args:
1070
 
                    logger.info(u"Sending secret to %s", client.name)
1071
 
                    client.checked_ok()
1072
 
                    if self.use_dbus:
1073
 
                        # Emit D-Bus signal
1074
 
                        client.ReceivedSecret()
1075
 
                    break
1076
 
            else:
1077
 
                logger.error(u"Sending secret to unknown client %s",
1078
 
                             args)
1079
 
        else:
1080
 
            logger.error(u"Unknown IPC command: %r", cmdline)
1081
 
        
1082
 
        # Keep calling this function
1083
 
        return True
 
408
            return super(type(self), self).server_bind()
1084
409
 
1085
410
 
1086
411
def string_to_delta(interval):
1087
412
    """Parse a string and return a datetime.timedelta
1088
 
    
1089
 
    >>> string_to_delta(u'7d')
 
413
 
 
414
    >>> string_to_delta('7d')
1090
415
    datetime.timedelta(7)
1091
 
    >>> string_to_delta(u'60s')
 
416
    >>> string_to_delta('60s')
1092
417
    datetime.timedelta(0, 60)
1093
 
    >>> string_to_delta(u'60m')
 
418
    >>> string_to_delta('60m')
1094
419
    datetime.timedelta(0, 3600)
1095
 
    >>> string_to_delta(u'24h')
 
420
    >>> string_to_delta('24h')
1096
421
    datetime.timedelta(1)
1097
422
    >>> string_to_delta(u'1w')
1098
423
    datetime.timedelta(7)
1099
 
    >>> string_to_delta(u'5m 30s')
1100
 
    datetime.timedelta(0, 330)
1101
424
    """
1102
 
    timevalue = datetime.timedelta(0)
1103
 
    for s in interval.split():
1104
 
        try:
1105
 
            suffix = unicode(s[-1])
1106
 
            value = int(s[:-1])
1107
 
            if suffix == u"d":
1108
 
                delta = datetime.timedelta(value)
1109
 
            elif suffix == u"s":
1110
 
                delta = datetime.timedelta(0, value)
1111
 
            elif suffix == u"m":
1112
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1113
 
            elif suffix == u"h":
1114
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1115
 
            elif suffix == u"w":
1116
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1117
 
            else:
1118
 
                raise ValueError
1119
 
        except (ValueError, IndexError):
 
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:
1120
439
            raise ValueError
1121
 
        timevalue += delta
1122
 
    return timevalue
 
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
1123
515
 
1124
516
 
1125
517
def if_nametoindex(interface):
1126
 
    """Call the C function if_nametoindex(), or equivalent
1127
 
    
1128
 
    Note: This function cannot accept a unicode string."""
1129
 
    global if_nametoindex
 
518
    """Call the C function if_nametoindex()"""
1130
519
    try:
1131
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1132
 
                          (ctypes.util.find_library(u"c"))
1133
 
                          .if_nametoindex)
 
520
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
521
        return libc.if_nametoindex(interface)
1134
522
    except (OSError, AttributeError):
1135
 
        logger.warning(u"Doing if_nametoindex the hard way")
1136
 
        def if_nametoindex(interface):
1137
 
            "Get an interface index the hard way, i.e. using fcntl()"
1138
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
1139
 
            with closing(socket.socket()) as s:
1140
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1141
 
                                    struct.pack(str(u"16s16x"),
1142
 
                                                interface))
1143
 
            interface_index = struct.unpack(str(u"I"),
1144
 
                                            ifreq[16:20])[0]
1145
 
            return interface_index
1146
 
    return if_nametoindex(interface)
1147
 
 
1148
 
 
1149
 
def daemon(nochdir = False, noclose = False):
1150
 
    """See daemon(3).  Standard BSD Unix function.
1151
 
    
1152
 
    This should really exist as os.daemon, but it doesn't (yet)."""
1153
 
    if os.fork():
1154
 
        sys.exit()
1155
 
    os.setsid()
1156
 
    if not nochdir:
1157
 
        os.chdir(u"/")
1158
 
    if os.fork():
1159
 
        sys.exit()
1160
 
    if not noclose:
1161
 
        # Close all standard open file descriptors
1162
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1163
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1164
 
            raise OSError(errno.ENODEV,
1165
 
                          u"/dev/null not a character device")
1166
 
        os.dup2(null, sys.stdin.fileno())
1167
 
        os.dup2(null, sys.stdout.fileno())
1168
 
        os.dup2(null, sys.stderr.fileno())
1169
 
        if null > 2:
1170
 
            os.close(null)
1171
 
 
1172
 
 
1173
 
def main():
1174
 
    
1175
 
    ######################################################################
1176
 
    # Parsing of options, both command line and config file
1177
 
    
1178
 
    parser = optparse.OptionParser(version = "%%prog %s" % version)
1179
 
    parser.add_option("-i", u"--interface", type=u"string",
1180
 
                      metavar="IF", help=u"Bind to interface IF")
1181
 
    parser.add_option("-a", u"--address", type=u"string",
1182
 
                      help=u"Address to listen for requests on")
1183
 
    parser.add_option("-p", u"--port", type=u"int",
1184
 
                      help=u"Port number to receive requests on")
1185
 
    parser.add_option("--check", action=u"store_true",
1186
 
                      help=u"Run self-test")
1187
 
    parser.add_option("--debug", action=u"store_true",
1188
 
                      help=u"Debug mode; run in foreground and log to"
1189
 
                      u" terminal")
1190
 
    parser.add_option("--priority", type=u"string", help=u"GnuTLS"
1191
 
                      u" priority string (see GnuTLS documentation)")
1192
 
    parser.add_option("--servicename", type=u"string",
1193
 
                      metavar=u"NAME", help=u"Zeroconf service name")
1194
 
    parser.add_option("--configdir", type=u"string",
1195
 
                      default=u"/etc/mandos", metavar=u"DIR",
1196
 
                      help=u"Directory to search for configuration"
1197
 
                      u" files")
1198
 
    parser.add_option("--no-dbus", action=u"store_false",
1199
 
                      dest=u"use_dbus", help=u"Do not provide D-Bus"
1200
 
                      u" system bus interface")
1201
 
    parser.add_option("--no-ipv6", action=u"store_false",
1202
 
                      dest=u"use_ipv6", help=u"Do not use IPv6")
1203
 
    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()
1204
566
    
1205
567
    if options.check:
1206
568
        import doctest
1207
569
        doctest.testmod()
1208
570
        sys.exit()
1209
571
    
1210
 
    # Default values for config file for server-global settings
1211
 
    server_defaults = { u"interface": u"",
1212
 
                        u"address": u"",
1213
 
                        u"port": u"",
1214
 
                        u"debug": u"False",
1215
 
                        u"priority":
1216
 
                        u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1217
 
                        u"servicename": u"Mandos",
1218
 
                        u"use_dbus": u"True",
1219
 
                        u"use_ipv6": u"True",
1220
 
                        }
1221
 
    
1222
 
    # Parse config file for server-global settings
1223
 
    server_config = configparser.SafeConfigParser(server_defaults)
1224
 
    del server_defaults
1225
 
    server_config.read(os.path.join(options.configdir,
1226
 
                                    u"mandos.conf"))
1227
 
    # Convert the SafeConfigParser object to a dict
1228
 
    server_settings = server_config.defaults()
1229
 
    # Use the appropriate methods on the non-string config options
1230
 
    for option in (u"debug", u"use_dbus", u"use_ipv6"):
1231
 
        server_settings[option] = server_config.getboolean(u"DEFAULT",
1232
 
                                                           option)
1233
 
    if server_settings["port"]:
1234
 
        server_settings["port"] = server_config.getint(u"DEFAULT",
1235
 
                                                       u"port")
1236
 
    del server_config
1237
 
    
1238
 
    # Override the settings from the config file with command line
1239
 
    # options, if set.
1240
 
    for option in (u"interface", u"address", u"port", u"debug",
1241
 
                   u"priority", u"servicename", u"configdir",
1242
 
                   u"use_dbus", u"use_ipv6"):
1243
 
        value = getattr(options, option)
1244
 
        if value is not None:
1245
 
            server_settings[option] = value
1246
 
    del options
1247
 
    # Force all strings to be unicode
1248
 
    for option in server_settings.keys():
1249
 
        if type(server_settings[option]) is str:
1250
 
            server_settings[option] = unicode(server_settings[option])
1251
 
    # Now we have our good server settings in "server_settings"
1252
 
    
1253
 
    ##################################################################
1254
 
    
1255
 
    # For convenience
1256
 
    debug = server_settings[u"debug"]
1257
 
    use_dbus = server_settings[u"use_dbus"]
1258
 
    use_ipv6 = server_settings[u"use_ipv6"]
1259
 
    
1260
 
    if not debug:
1261
 
        syslogger.setLevel(logging.WARNING)
1262
 
        console.setLevel(logging.WARNING)
1263
 
    
1264
 
    if server_settings[u"servicename"] != u"Mandos":
1265
 
        syslogger.setFormatter(logging.Formatter
1266
 
                               (u'Mandos (%s) [%%(process)d]:'
1267
 
                                u' %%(levelname)s: %%(message)s'
1268
 
                                % server_settings[u"servicename"]))
1269
 
    
1270
 
    # Parse config file with clients
1271
 
    client_defaults = { u"timeout": u"1h",
1272
 
                        u"interval": u"5m",
1273
 
                        u"checker": u"fping -q -- %%(host)s",
1274
 
                        u"host": u"",
1275
 
                        }
1276
 
    client_config = configparser.SafeConfigParser(client_defaults)
1277
 
    client_config.read(os.path.join(server_settings[u"configdir"],
1278
 
                                    u"clients.conf"))
1279
 
    
1280
 
    global mandos_dbus_service
1281
 
    mandos_dbus_service = None
1282
 
    
1283
 
    tcp_server = MandosServer((server_settings[u"address"],
1284
 
                               server_settings[u"port"]),
1285
 
                              ClientHandler,
1286
 
                              interface=server_settings[u"interface"],
1287
 
                              use_ipv6=use_ipv6,
1288
 
                              gnutls_priority=
1289
 
                              server_settings[u"priority"],
1290
 
                              use_dbus=use_dbus)
1291
 
    pidfilename = u"/var/run/mandos.pid"
1292
 
    try:
1293
 
        pidfile = open(pidfilename, u"w")
1294
 
    except IOError:
1295
 
        logger.error(u"Could not open file %r", pidfilename)
1296
 
    
1297
 
    try:
1298
 
        uid = pwd.getpwnam(u"_mandos").pw_uid
1299
 
        gid = pwd.getpwnam(u"_mandos").pw_gid
1300
 
    except KeyError:
1301
 
        try:
1302
 
            uid = pwd.getpwnam(u"mandos").pw_uid
1303
 
            gid = pwd.getpwnam(u"mandos").pw_gid
1304
 
        except KeyError:
1305
 
            try:
1306
 
                uid = pwd.getpwnam(u"nobody").pw_uid
1307
 
                gid = pwd.getpwnam(u"nobody").pw_gid
1308
 
            except KeyError:
1309
 
                uid = 65534
1310
 
                gid = 65534
1311
 
    try:
1312
 
        os.setgid(gid)
1313
 
        os.setuid(uid)
1314
 
    except OSError, error:
1315
 
        if error[0] != errno.EPERM:
1316
 
            raise error
1317
 
    
1318
 
    # Enable all possible GnuTLS debugging
1319
 
    if debug:
1320
 
        # "Use a log level over 10 to enable all debugging options."
1321
 
        # - GnuTLS manual
1322
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1323
 
        
1324
 
        @gnutls.library.types.gnutls_log_func
1325
 
        def debug_gnutls(level, string):
1326
 
            logger.debug(u"GnuTLS: %s", string[:-1])
1327
 
        
1328
 
        (gnutls.library.functions
1329
 
         .gnutls_global_set_log_function(debug_gnutls))
1330
 
    
1331
 
    global main_loop
1332
 
    # 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
1333
589
    DBusGMainLoop(set_as_default=True )
1334
590
    main_loop = gobject.MainLoop()
1335
591
    bus = dbus.SystemBus()
1336
 
    # End of Avahi example code
1337
 
    if use_dbus:
1338
 
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
1339
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1340
 
    service = AvahiService(name = server_settings[u"servicename"],
1341
 
                           servicetype = u"_mandos._tcp",
1342
 
                           protocol = protocol, bus = bus)
1343
 
    if server_settings["interface"]:
1344
 
        service.interface = (if_nametoindex
1345
 
                             (str(server_settings[u"interface"])))
1346
 
    
1347
 
    client_class = Client
1348
 
    if use_dbus:
1349
 
        client_class = functools.partial(ClientDBus, bus = bus)
1350
 
    tcp_server.clients.update(set(
1351
 
            client_class(name = section,
1352
 
                         config= dict(client_config.items(section)))
1353
 
            for section in client_config.sections()))
1354
 
    if not tcp_server.clients:
1355
 
        logger.warning(u"No clients defined")
1356
 
    
1357
 
    if debug:
1358
 
        # Redirect stdin so all checkers get /dev/null
1359
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1360
 
        os.dup2(null, sys.stdin.fileno())
1361
 
        if null > 2:
1362
 
            os.close(null)
1363
 
    else:
1364
 
        # No console logging
1365
 
        logger.removeHandler(console)
1366
 
        # Close all input and output, do double fork, etc.
1367
 
        daemon()
1368
 
    
1369
 
    try:
1370
 
        with closing(pidfile):
1371
 
            pid = os.getpid()
1372
 
            pidfile.write(str(pid) + "\n")
1373
 
        del pidfile
1374
 
    except IOError:
1375
 
        logger.error(u"Could not write to file %r with PID %d",
1376
 
                     pidfilename, pid)
1377
 
    except NameError:
1378
 
        # "pidfile" was never created
1379
 
        pass
1380
 
    del pidfilename
1381
 
    
1382
 
    def cleanup():
1383
 
        "Cleanup function; run on exit"
1384
 
        service.cleanup()
1385
 
        
1386
 
        while tcp_server.clients:
1387
 
            client = tcp_server.clients.pop()
1388
 
            client.disable_hook = None
1389
 
            client.disable()
1390
 
    
1391
 
    atexit.register(cleanup)
1392
 
    
1393
 
    if not debug:
1394
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1395
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1396
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1397
 
    
1398
 
    if use_dbus:
1399
 
        class MandosDBusService(dbus.service.Object):
1400
 
            """A D-Bus proxy object"""
1401
 
            def __init__(self):
1402
 
                dbus.service.Object.__init__(self, bus, u"/")
1403
 
            _interface = u"se.bsnet.fukt.Mandos"
1404
 
            
1405
 
            @dbus.service.signal(_interface, signature=u"oa{sv}")
1406
 
            def ClientAdded(self, objpath, properties):
1407
 
                "D-Bus signal"
1408
 
                pass
1409
 
            
1410
 
            @dbus.service.signal(_interface, signature=u"s")
1411
 
            def ClientNotFound(self, fingerprint):
1412
 
                "D-Bus signal"
1413
 
                pass
1414
 
            
1415
 
            @dbus.service.signal(_interface, signature=u"os")
1416
 
            def ClientRemoved(self, objpath, name):
1417
 
                "D-Bus signal"
1418
 
                pass
1419
 
            
1420
 
            @dbus.service.method(_interface, out_signature=u"ao")
1421
 
            def GetAllClients(self):
1422
 
                "D-Bus method"
1423
 
                return dbus.Array(c.dbus_object_path
1424
 
                                  for c in tcp_server.clients)
1425
 
            
1426
 
            @dbus.service.method(_interface,
1427
 
                                 out_signature=u"a{oa{sv}}")
1428
 
            def GetAllClientsWithProperties(self):
1429
 
                "D-Bus method"
1430
 
                return dbus.Dictionary(
1431
 
                    ((c.dbus_object_path, c.GetAllProperties())
1432
 
                     for c in tcp_server.clients),
1433
 
                    signature=u"oa{sv}")
1434
 
            
1435
 
            @dbus.service.method(_interface, in_signature=u"o")
1436
 
            def RemoveClient(self, object_path):
1437
 
                "D-Bus method"
1438
 
                for c in tcp_server.clients:
1439
 
                    if c.dbus_object_path == object_path:
1440
 
                        tcp_server.clients.remove(c)
1441
 
                        c.remove_from_connection()
1442
 
                        # Don't signal anything except ClientRemoved
1443
 
                        c.disable(signal=False)
1444
 
                        # Emit D-Bus signal
1445
 
                        self.ClientRemoved(object_path, c.name)
1446
 
                        return
1447
 
                raise KeyError
1448
 
            
1449
 
            del _interface
1450
 
        
1451
 
        mandos_dbus_service = MandosDBusService()
1452
 
    
1453
 
    for client in tcp_server.clients:
1454
 
        if use_dbus:
1455
 
            # Emit D-Bus signal
1456
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path,
1457
 
                                            client.GetAllProperties())
1458
 
        client.enable()
1459
 
    
1460
 
    tcp_server.enable()
1461
 
    tcp_server.server_activate()
1462
 
    
1463
 
    # Find out what port we got
1464
 
    service.port = tcp_server.socket.getsockname()[1]
1465
 
    if use_ipv6:
1466
 
        logger.info(u"Now listening on address %r, port %d,"
1467
 
                    " flowinfo %d, scope_id %d"
1468
 
                    % tcp_server.socket.getsockname())
1469
 
    else:                       # IPv4
1470
 
        logger.info(u"Now listening on address %r, port %d"
1471
 
                    % tcp_server.socket.getsockname())
1472
 
    
1473
 
    #service.interface = tcp_server.socket.getsockname()[3]
1474
 
    
1475
 
    try:
1476
 
        # From the Avahi example code
1477
 
        try:
1478
 
            service.activate()
1479
 
        except dbus.exceptions.DBusException, error:
1480
 
            logger.critical(u"DBusException: %s", error)
1481
 
            sys.exit(1)
1482
 
        # End of Avahi example code
1483
 
        
1484
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1485
 
                             lambda *args, **kwargs:
1486
 
                             (tcp_server.handle_request
1487
 
                              (*args[2:], **kwargs) or True))
1488
 
        
1489
 
        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:
1490
635
        main_loop.run()
1491
 
    except AvahiError, error:
1492
 
        logger.critical(u"AvahiError: %s", error)
1493
 
        sys.exit(1)
1494
636
    except KeyboardInterrupt:
1495
 
        if debug:
1496
 
            print >> sys.stderr
1497
 
        logger.debug(u"Server received KeyboardInterrupt")
1498
 
    logger.debug(u"Server exiting")
 
637
        print
 
638
    
 
639
    # Cleanup here
1499
640
 
1500
 
if __name__ == '__main__':
1501
 
    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()