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  • Committer: Teddy Hogeborn
  • Date: 2008-07-19 18:43:24 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080719184324-iwhoa5in75xa0u2u
* mandos-clients.conf ([foo]/dn, [foo]/password, [braxen_client]/dn,
                       [braxen_client]/password): Removed.
  ([foo]/fingerprint, [braxen_client]/fingerprint): New.
  ([foo]/checker): New.
  ([foo]/secfile): New.
  ([braxen_client]/secret): New.

* server.py: New "--debug" option to set debug flag.  Removed "cert",
             "key", "ca", "crl", and "cred" variables.  Added default
             value for "checker" config file setting.  Do not pass
             credentials to IPv6_TCPServer constructor.
  (debug): New global debug flag.  Used by most debugging output code.
  (Client.__init__): Keyword argument "dn" replaced by "fingerprint",
                     "password" renamed to "secret", and "passfile"
                     renamed to "secfile".  New keyword argument
                     "checker". All callers changed.
  (Client.dn): Removed.
  (Client.fingerprint): New.
  (Client.password): Renamed to "secret"; all users changed.
  (Client.passfile): Renamed to "secfile"; all users changed.
  (Client.timeout, Client.interval): Changed to be properties; now
                                     automatically updates the
                                     "_timeout_milliseconds" and
                                     "_interval_milliseconds" values.
  (Client.timeout_milliseconds): Renamed to "_timeout_milliseconds".
  (Client.interval_milliseconds): Renamed to "_interval_milliseconds".
  (Client.check_command): New.
  (Client.start_checker): Use the new "check_command" attribute.
  (peer_certificate, fingerprint): New functions.

  (tcp_handler.handle): Use ClientSession with empty credentials
                        object instead of ServerSession.  Set gnutls
                        priority string.  Do not verify peer.  Use
                        fingerprint instead of DN when searching for
                        clients.  Bug fix: Loop sending data so even large
                        secret data strings are sent.
  (IPv6_TCPServer.credentials): Removed.
  (if_nametoindex): Do not import ctypes since that is now imported
                    globally.

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server.py
1
1
#!/usr/bin/python
2
 
# -*- mode: python; coding: utf-8 -*-
3
 
# 
4
 
# Mandos server - give out binary blobs to connecting clients.
5
 
# 
6
 
# This program is partly derived from an example program for an Avahi
7
 
# service publisher, downloaded from
8
 
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add" and "remove" in the "AvahiService" class, the
10
 
# "server_state_changed" and "entry_group_state_changed" functions,
11
 
# and some lines in "main".
12
 
# 
13
 
# Everything else is
14
 
# Copyright © 2008 Teddy Hogeborn
15
 
# Copyright © 2008 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
2
 
34
 
from __future__ import division, with_statement, absolute_import
 
3
from __future__ import division
35
4
 
36
5
import SocketServer
37
6
import socket
 
7
import select
38
8
from optparse import OptionParser
39
9
import datetime
40
10
import errno
51
21
import signal
52
22
from sets import Set
53
23
import subprocess
54
 
import atexit
55
 
import stat
56
 
import logging
57
 
import logging.handlers
58
 
import pwd
59
 
from contextlib import closing
60
24
 
61
25
import dbus
62
 
import dbus.service
63
26
import gobject
64
27
import avahi
65
28
from dbus.mainloop.glib import DBusGMainLoop
66
29
import ctypes
67
 
import ctypes.util
68
 
 
69
 
version = "1.0.2"
70
 
 
71
 
logger = logging.Logger('mandos')
72
 
syslogger = (logging.handlers.SysLogHandler
73
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
74
 
              address = "/dev/log"))
75
 
syslogger.setFormatter(logging.Formatter
76
 
                       ('Mandos: %(levelname)s: %(message)s'))
77
 
logger.addHandler(syslogger)
78
 
 
79
 
console = logging.StreamHandler()
80
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
81
 
                                       ' %(message)s'))
82
 
logger.addHandler(console)
83
 
 
84
 
class AvahiError(Exception):
85
 
    def __init__(self, value):
86
 
        self.value = value
87
 
        super(AvahiError, self).__init__()
88
 
    def __str__(self):
89
 
        return repr(self.value)
90
 
 
91
 
class AvahiServiceError(AvahiError):
92
 
    pass
93
 
 
94
 
class AvahiGroupError(AvahiError):
95
 
    pass
96
 
 
97
 
 
98
 
class AvahiService(object):
99
 
    """An Avahi (Zeroconf) service.
100
 
    Attributes:
101
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
102
 
               Used to optionally bind to the specified interface.
103
 
    name: string; Example: 'Mandos'
104
 
    type: string; Example: '_mandos._tcp'.
105
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
106
 
    port: integer; what port to announce
107
 
    TXT: list of strings; TXT record for the service
108
 
    domain: string; Domain to publish on, default to .local if empty.
109
 
    host: string; Host to publish records for, default is localhost
110
 
    max_renames: integer; maximum number of renames
111
 
    rename_count: integer; counter so we only rename after collisions
112
 
                  a sensible number of times
113
 
    """
114
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
115
 
                 servicetype = None, port = None, TXT = None,
116
 
                 domain = "", host = "", max_renames = 32768):
117
 
        self.interface = interface
118
 
        self.name = name
119
 
        self.type = servicetype
120
 
        self.port = port
121
 
        self.TXT = TXT if TXT is not None else []
122
 
        self.domain = domain
123
 
        self.host = host
124
 
        self.rename_count = 0
125
 
        self.max_renames = max_renames
126
 
    def rename(self):
127
 
        """Derived from the Avahi example code"""
128
 
        if self.rename_count >= self.max_renames:
129
 
            logger.critical(u"No suitable Zeroconf service name found"
130
 
                            u" after %i retries, exiting.",
131
 
                            self.rename_count)
132
 
            raise AvahiServiceError("Too many renames")
133
 
        self.name = server.GetAlternativeServiceName(self.name)
134
 
        logger.info(u"Changing Zeroconf service name to %r ...",
135
 
                    str(self.name))
136
 
        syslogger.setFormatter(logging.Formatter
137
 
                               ('Mandos (%s): %%(levelname)s:'
138
 
                                ' %%(message)s' % self.name))
139
 
        self.remove()
140
 
        self.add()
141
 
        self.rename_count += 1
142
 
    def remove(self):
143
 
        """Derived from the Avahi example code"""
144
 
        if group is not None:
145
 
            group.Reset()
146
 
    def add(self):
147
 
        """Derived from the Avahi example code"""
148
 
        global group
149
 
        if group is None:
150
 
            group = dbus.Interface(bus.get_object
151
 
                                   (avahi.DBUS_NAME,
152
 
                                    server.EntryGroupNew()),
153
 
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
154
 
            group.connect_to_signal('StateChanged',
155
 
                                    entry_group_state_changed)
156
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
157
 
                     service.name, service.type)
158
 
        group.AddService(
159
 
                self.interface,         # interface
160
 
                avahi.PROTO_INET6,      # protocol
161
 
                dbus.UInt32(0),         # flags
162
 
                self.name, self.type,
163
 
                self.domain, self.host,
164
 
                dbus.UInt16(self.port),
165
 
                avahi.string_array_to_txt_array(self.TXT))
166
 
        group.Commit()
167
 
 
168
 
# From the Avahi example code:
169
 
group = None                            # our entry group
 
30
 
 
31
# This variable is used to optionally bind to a specified interface.
 
32
# It is a global variable to fit in with the other variables from the
 
33
# Avahi server example code.
 
34
serviceInterface = avahi.IF_UNSPEC
 
35
# From the Avahi server example code:
 
36
serviceName = "Mandos"
 
37
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
38
servicePort = None                      # Not known at startup
 
39
serviceTXT = []                         # TXT record for the service
 
40
domain = ""                  # Domain to publish on, default to .local
 
41
host = ""          # Host to publish records for, default to localhost
 
42
group = None #our entry group
 
43
rename_count = 12       # Counter so we only rename after collisions a
 
44
                        # sensible number of times
170
45
# End of Avahi example code
171
46
 
172
47
 
173
 
class Client(dbus.service.Object):
 
48
class Client(object):
174
49
    """A representation of a client host served by this server.
175
50
    Attributes:
176
51
    name:      string; from the config file, used in log messages
177
52
    fingerprint: string (40 or 32 hexadecimal digits); used to
178
53
                 uniquely identify the client
179
54
    secret:    bytestring; sent verbatim (over TLS) to client
180
 
    host:      string; available for use by the checker command
181
 
    created:   datetime.datetime(); (UTC) object creation
182
 
    started:   datetime.datetime(); (UTC) last started
183
 
    last_checked_ok: datetime.datetime(); (UTC) or None
184
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
185
 
                                     until this client is invalid
 
55
    fqdn:      string (FQDN); available for use by the checker command
 
56
    created:   datetime.datetime()
 
57
    last_seen: datetime.datetime() or None if not yet seen
 
58
    timeout:   datetime.timedelta(); How long from last_seen until
 
59
                                     this client is invalid
186
60
    interval:  datetime.timedelta(); How often to start a new checker
187
61
    stop_hook: If set, called by stop() as stop_hook(self)
188
62
    checker:   subprocess.Popen(); a running checker process used
189
63
                                   to see if the client lives.
190
 
                                   'None' if no process is running.
 
64
                                   Is None if no process is running.
191
65
    checker_initiator_tag: a gobject event source tag, or None
192
66
    stop_initiator_tag:    - '' -
193
67
    checker_callback_tag:  - '' -
194
68
    checker_command: string; External command which is run to check if
195
 
                     client lives.  %() expansions are done at
 
69
                     client lives.  %()s expansions are done at
196
70
                     runtime with vars(self) as dict, so that for
197
71
                     instance %(name)s can be used in the command.
198
72
    Private attibutes:
199
73
    _timeout: Real variable for 'timeout'
200
74
    _interval: Real variable for 'interval'
201
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
75
    _timeout_milliseconds: Used by gobject.timeout_add()
202
76
    _interval_milliseconds: - '' -
203
77
    """
204
78
    def _set_timeout(self, timeout):
205
 
        "Setter function for the 'timeout' attribute"
 
79
        "Setter function for 'timeout' attribute"
206
80
        self._timeout = timeout
207
81
        self._timeout_milliseconds = ((self.timeout.days
208
82
                                       * 24 * 60 * 60 * 1000)
209
83
                                      + (self.timeout.seconds * 1000)
210
84
                                      + (self.timeout.microseconds
211
85
                                         // 1000))
212
 
        # Emit D-Bus signal
213
 
        self.TimeoutChanged(self._timeout_milliseconds)
214
 
    timeout = property(lambda self: self._timeout, _set_timeout)
 
86
    timeout = property(lambda self: self._timeout,
 
87
                       _set_timeout)
215
88
    del _set_timeout
216
 
    
217
89
    def _set_interval(self, interval):
218
 
        "Setter function for the 'interval' attribute"
 
90
        "Setter function for 'interval' attribute"
219
91
        self._interval = interval
220
92
        self._interval_milliseconds = ((self.interval.days
221
93
                                        * 24 * 60 * 60 * 1000)
223
95
                                          * 1000)
224
96
                                       + (self.interval.microseconds
225
97
                                          // 1000))
226
 
        # Emit D-Bus signal
227
 
        self.IntervalChanged(self._interval_milliseconds)
228
 
    interval = property(lambda self: self._interval, _set_interval)
 
98
    interval = property(lambda self: self._interval,
 
99
                        _set_interval)
229
100
    del _set_interval
230
 
    
231
 
    def __init__(self, name = None, stop_hook=None, config=None):
232
 
        """Note: the 'checker' key in 'config' sets the
233
 
        'checker_command' attribute and *not* the 'checker'
234
 
        attribute."""
235
 
        dbus.service.Object.__init__(self, bus,
236
 
                                     "/Mandos/clients/%s"
237
 
                                     % name.replace(".", "_"))
238
 
        if config is None:
239
 
            config = {}
 
101
    def __init__(self, name=None, options=None, stop_hook=None,
 
102
                 fingerprint=None, secret=None, secfile=None, fqdn=None,
 
103
                 timeout=None, interval=-1, checker=None):
240
104
        self.name = name
241
 
        logger.debug(u"Creating client %r", self.name)
242
 
        # Uppercase and remove spaces from fingerprint for later
243
 
        # comparison purposes with return value from the fingerprint()
244
 
        # function
245
 
        self.fingerprint = (config["fingerprint"].upper()
246
 
                            .replace(u" ", u""))
247
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
248
 
        if "secret" in config:
249
 
            self.secret = config["secret"].decode(u"base64")
250
 
        elif "secfile" in config:
251
 
            with closing(open(os.path.expanduser
252
 
                              (os.path.expandvars
253
 
                               (config["secfile"])))) as secfile:
254
 
                self.secret = secfile.read()
255
 
        else:
256
 
            raise TypeError(u"No secret or secfile for client %s"
257
 
                            % self.name)
258
 
        self.host = config.get("host", "")
259
 
        self.created = datetime.datetime.utcnow()
260
 
        self.started = None
261
 
        self.last_checked_ok = None
262
 
        self.timeout = string_to_delta(config["timeout"])
263
 
        self.interval = string_to_delta(config["interval"])
 
105
        # Uppercase and remove spaces from fingerprint
 
106
        # for later comparison purposes with return value of
 
107
        # the fingerprint() function
 
108
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
109
        if secret:
 
110
            self.secret = secret.decode(u"base64")
 
111
        elif secfile:
 
112
            sf = open(secfile)
 
113
            self.secret = sf.read()
 
114
            sf.close()
 
115
        else:
 
116
            raise RuntimeError(u"No secret or secfile for client %s"
 
117
                               % self.name)
 
118
        self.fqdn = fqdn                # string
 
119
        self.created = datetime.datetime.now()
 
120
        self.last_seen = None
 
121
        if timeout is None:
 
122
            timeout = options.timeout
 
123
        self.timeout = timeout
 
124
        if interval == -1:
 
125
            interval = options.interval
 
126
        else:
 
127
            interval = string_to_delta(interval)
 
128
        self.interval = interval
264
129
        self.stop_hook = stop_hook
265
130
        self.checker = None
266
131
        self.checker_initiator_tag = None
267
132
        self.stop_initiator_tag = None
268
133
        self.checker_callback_tag = None
269
 
        self.check_command = config["checker"]
270
 
    
 
134
        self.check_command = checker
271
135
    def start(self):
272
 
        """Start this client's checker and timeout hooks"""
273
 
        self.started = datetime.datetime.utcnow()
 
136
        """Start this clients checker and timeout hooks"""
274
137
        # Schedule a new checker to be started an 'interval' from now,
275
138
        # and every interval from then on.
276
 
        self.checker_initiator_tag = (gobject.timeout_add
277
 
                                      (self._interval_milliseconds,
278
 
                                       self.start_checker))
 
139
        self.checker_initiator_tag = gobject.timeout_add\
 
140
                                     (self._interval_milliseconds,
 
141
                                      self.start_checker)
279
142
        # Also start a new checker *right now*.
280
143
        self.start_checker()
281
144
        # Schedule a stop() when 'timeout' has passed
282
 
        self.stop_initiator_tag = (gobject.timeout_add
283
 
                                   (self._timeout_milliseconds,
284
 
                                    self.stop))
285
 
        # Emit D-Bus signal
286
 
        self.StateChanged(True)
287
 
    
 
145
        self.stop_initiator_tag = gobject.timeout_add\
 
146
                                  (self._timeout_milliseconds,
 
147
                                   self.stop)
288
148
    def stop(self):
289
 
        """Stop this client."""
290
 
        if getattr(self, "started", None) is not None:
291
 
            logger.info(u"Stopping client %s", self.name)
292
 
        else:
293
 
            return False
294
 
        if getattr(self, "stop_initiator_tag", False):
 
149
        """Stop this client.
 
150
        The possibility that this client might be restarted is left
 
151
        open, but not currently used."""
 
152
        if debug:
 
153
            sys.stderr.write(u"Stopping client %s\n" % self.name)
 
154
        self.secret = None
 
155
        if self.stop_initiator_tag:
295
156
            gobject.source_remove(self.stop_initiator_tag)
296
157
            self.stop_initiator_tag = None
297
 
        if getattr(self, "checker_initiator_tag", False):
 
158
        if self.checker_initiator_tag:
298
159
            gobject.source_remove(self.checker_initiator_tag)
299
160
            self.checker_initiator_tag = None
300
161
        self.stop_checker()
301
162
        if self.stop_hook:
302
163
            self.stop_hook(self)
303
 
        self.started = None
304
 
        # Emit D-Bus signal
305
 
        self.StateChanged(False)
306
164
        # Do not run this again if called by a gobject.timeout_add
307
165
        return False
308
 
    
309
166
    def __del__(self):
310
 
        self.stop_hook = None
311
 
        self.stop()
312
 
    
 
167
        # Some code duplication here and in stop()
 
168
        if hasattr(self, "stop_initiator_tag") \
 
169
               and self.stop_initiator_tag:
 
170
            gobject.source_remove(self.stop_initiator_tag)
 
171
            self.stop_initiator_tag = None
 
172
        if hasattr(self, "checker_initiator_tag") \
 
173
               and self.checker_initiator_tag:
 
174
            gobject.source_remove(self.checker_initiator_tag)
 
175
            self.checker_initiator_tag = None
 
176
        self.stop_checker()
313
177
    def checker_callback(self, pid, condition):
314
178
        """The checker has completed, so take appropriate actions."""
 
179
        now = datetime.datetime.now()
 
180
        if os.WIFEXITED(condition) \
 
181
               and (os.WEXITSTATUS(condition) == 0):
 
182
            if debug:
 
183
                sys.stderr.write(u"Checker for %(name)s succeeded\n"
 
184
                                 % vars(self))
 
185
            self.last_seen = now
 
186
            gobject.source_remove(self.stop_initiator_tag)
 
187
            self.stop_initiator_tag = gobject.timeout_add\
 
188
                                      (self._timeout_milliseconds,
 
189
                                       self.stop)
 
190
        elif debug:
 
191
            if not os.WIFEXITED(condition):
 
192
                sys.stderr.write(u"Checker for %(name)s crashed?\n"
 
193
                                 % vars(self))
 
194
            else:
 
195
                sys.stderr.write(u"Checker for %(name)s failed\n"
 
196
                                 % vars(self))
 
197
        self.checker = None
315
198
        self.checker_callback_tag = None
316
 
        self.checker = None
317
 
        if (os.WIFEXITED(condition) 
318
 
            and (os.WEXITSTATUS(condition) == 0)):
319
 
            logger.info(u"Checker for %(name)s succeeded",
320
 
                        vars(self))
321
 
            # Emit D-Bus signal
322
 
            self.CheckerCompleted(True)
323
 
            self.bump_timeout()
324
 
        elif not os.WIFEXITED(condition):
325
 
            logger.warning(u"Checker for %(name)s crashed?",
326
 
                           vars(self))
327
 
            # Emit D-Bus signal
328
 
            self.CheckerCompleted(False)
329
 
        else:
330
 
            logger.info(u"Checker for %(name)s failed",
331
 
                        vars(self))
332
 
            # Emit D-Bus signal
333
 
            self.CheckerCompleted(False)
334
 
    
335
 
    def bump_timeout(self):
336
 
        """Bump up the timeout for this client.
337
 
        This should only be called when the client has been seen,
338
 
        alive and well.
339
 
        """
340
 
        self.last_checked_ok = datetime.datetime.utcnow()
341
 
        gobject.source_remove(self.stop_initiator_tag)
342
 
        self.stop_initiator_tag = (gobject.timeout_add
343
 
                                   (self._timeout_milliseconds,
344
 
                                    self.stop))
345
 
    
346
199
    def start_checker(self):
347
200
        """Start a new checker subprocess if one is not running.
348
201
        If a checker already exists, leave it running and do
349
202
        nothing."""
350
 
        # The reason for not killing a running checker is that if we
351
 
        # did that, then if a checker (for some reason) started
352
 
        # running slowly and taking more than 'interval' time, the
353
 
        # client would inevitably timeout, since no checker would get
354
 
        # a chance to run to completion.  If we instead leave running
355
 
        # checkers alone, the checker would have to take more time
356
 
        # than 'timeout' for the client to be declared invalid, which
357
 
        # is as it should be.
358
203
        if self.checker is None:
 
204
            if debug:
 
205
                sys.stderr.write(u"Starting checker for %s\n"
 
206
                                 % self.name)
359
207
            try:
360
 
                # In case check_command has exactly one % operator
361
 
                command = self.check_command % self.host
 
208
                command = self.check_command % self.fqdn
362
209
            except TypeError:
363
 
                # Escape attributes for the shell
364
210
                escaped_attrs = dict((key, re.escape(str(val)))
365
211
                                     for key, val in
366
212
                                     vars(self).iteritems())
367
 
                try:
368
 
                    command = self.check_command % escaped_attrs
369
 
                except TypeError, error:
370
 
                    logger.error(u'Could not format string "%s":'
371
 
                                 u' %s', self.check_command, error)
372
 
                    return True # Try again later
 
213
                command = self.check_command % escaped_attrs
373
214
            try:
374
 
                logger.info(u"Starting checker %r for %s",
375
 
                            command, self.name)
376
 
                # We don't need to redirect stdout and stderr, since
377
 
                # in normal mode, that is already done by daemon(),
378
 
                # and in debug mode we don't want to.  (Stdin is
379
 
                # always replaced by /dev/null.)
380
 
                self.checker = subprocess.Popen(command,
381
 
                                                close_fds=True,
382
 
                                                shell=True, cwd="/")
383
 
                self.checker_callback_tag = (gobject.child_watch_add
384
 
                                             (self.checker.pid,
385
 
                                              self.checker_callback))
386
 
                # Emit D-Bus signal
387
 
                self.CheckerStarted(command)
388
 
            except OSError, error:
389
 
                logger.error(u"Failed to start subprocess: %s",
390
 
                             error)
 
215
                self.checker = subprocess.\
 
216
                               Popen(command,
 
217
                                     stdout=subprocess.PIPE,
 
218
                                     close_fds=True, shell=True,
 
219
                                     cwd="/")
 
220
                self.checker_callback_tag = gobject.\
 
221
                                            child_watch_add(self.checker.pid,
 
222
                                                            self.\
 
223
                                                            checker_callback)
 
224
            except subprocess.OSError, error:
 
225
                sys.stderr.write(u"Failed to start subprocess: %s\n"
 
226
                                 % error)
391
227
        # Re-run this periodically if run by gobject.timeout_add
392
228
        return True
393
 
    
394
229
    def stop_checker(self):
395
230
        """Force the checker process, if any, to stop."""
396
 
        if self.checker_callback_tag:
397
 
            gobject.source_remove(self.checker_callback_tag)
398
 
            self.checker_callback_tag = None
399
 
        if getattr(self, "checker", None) is None:
 
231
        if not hasattr(self, "checker") or self.checker is None:
400
232
            return
401
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
402
 
        try:
403
 
            os.kill(self.checker.pid, signal.SIGTERM)
404
 
            #os.sleep(0.5)
405
 
            #if self.checker.poll() is None:
406
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
407
 
        except OSError, error:
408
 
            if error.errno != errno.ESRCH: # No such process
409
 
                raise
 
233
        gobject.source_remove(self.checker_callback_tag)
 
234
        self.checker_callback_tag = None
 
235
        os.kill(self.checker.pid, signal.SIGTERM)
 
236
        if self.checker.poll() is None:
 
237
            os.kill(self.checker.pid, signal.SIGKILL)
410
238
        self.checker = None
411
 
    
412
 
    def still_valid(self):
 
239
    def still_valid(self, now=None):
413
240
        """Has the timeout not yet passed for this client?"""
414
 
        if not self.started:
415
 
            return False
416
 
        now = datetime.datetime.utcnow()
417
 
        if self.last_checked_ok is None:
 
241
        if now is None:
 
242
            now = datetime.datetime.now()
 
243
        if self.last_seen is None:
418
244
            return now < (self.created + self.timeout)
419
245
        else:
420
 
            return now < (self.last_checked_ok + self.timeout)
421
 
    
422
 
    ## D-Bus methods & signals
423
 
    _interface = u"org.mandos_system.Mandos.Client"
424
 
    
425
 
    def _datetime_to_dbus_struct(dt):
426
 
        return dbus.Struct(dt.year, dt.month, dt.day, dt.hour,
427
 
                           dt.minute, dt.second, dt.microsecond,
428
 
                           signature="nyyyyyu")
429
 
    
430
 
    # BumpTimeout - method
431
 
    BumpTimeout = dbus.service.method(_interface)(bump_timeout)
432
 
    BumpTimeout.__name__ = "BumpTimeout"
433
 
    
434
 
    # IntervalChanged - signal
435
 
    @dbus.service.signal(_interface, signature="t")
436
 
    def IntervalChanged(self, t):
437
 
        "D-Bus signal"
438
 
        pass
439
 
    
440
 
    # CheckerCompleted - signal
441
 
    @dbus.service.signal(_interface, signature="b")
442
 
    def CheckerCompleted(self, success):
443
 
        "D-Bus signal"
444
 
        pass
445
 
    
446
 
    # CheckerIsRunning - method
447
 
    @dbus.service.method(_interface, out_signature="b")
448
 
    def CheckerIsRunning(self):
449
 
        "D-Bus getter method"
450
 
        return self.checker is not None
451
 
    
452
 
    # CheckerStarted - signal
453
 
    @dbus.service.signal(_interface, signature="s")
454
 
    def CheckerStarted(self, command):
455
 
        "D-Bus signal"
456
 
        pass
457
 
    
458
 
    # GetChecker - method
459
 
    @dbus.service.method(_interface, out_signature="s")
460
 
    def GetChecker(self):
461
 
        "D-Bus getter method"
462
 
        return self.checker_command
463
 
    
464
 
    # GetCreated - method
465
 
    @dbus.service.method(_interface, out_signature="(nyyyyyu)")
466
 
    def GetCreated(self):
467
 
        "D-Bus getter method"
468
 
        return datetime_to_dbus_struct(self.created)
469
 
    
470
 
    # GetFingerprint - method
471
 
    @dbus.service.method(_interface, out_signature="s")
472
 
    def GetFingerprint(self):
473
 
        "D-Bus getter method"
474
 
        return self.fingerprint
475
 
    
476
 
    # GetHost - method
477
 
    @dbus.service.method(_interface, out_signature="s")
478
 
    def GetHost(self):
479
 
        "D-Bus getter method"
480
 
        return self.host
481
 
    
482
 
    # GetInterval - method
483
 
    @dbus.service.method(_interface, out_signature="t")
484
 
    def GetInterval(self):
485
 
        "D-Bus getter method"
486
 
        return self._interval_milliseconds
487
 
    
488
 
    # GetName - method
489
 
    @dbus.service.method(_interface, out_signature="s")
490
 
    def GetName(self):
491
 
        "D-Bus getter method"
492
 
        return self.name
493
 
    
494
 
    # GetStarted - method
495
 
    @dbus.service.method(_interface, out_signature="(nyyyyyu)")
496
 
    def GetStarted(self):
497
 
        "D-Bus getter method"
498
 
        if self.started is not None:
499
 
            return datetime_to_dbus_struct(self.started)
500
 
        else:
501
 
            return dbus.Struct(0, 0, 0, 0, 0, 0, 0,
502
 
                               signature="nyyyyyu")
503
 
    
504
 
    # GetTimeout - method
505
 
    @dbus.service.method(_interface, out_signature="t")
506
 
    def GetTimeout(self):
507
 
        "D-Bus getter method"
508
 
        return self._timeout_milliseconds
509
 
    
510
 
    # SetChecker - method
511
 
    @dbus.service.method(_interface, in_signature="s")
512
 
    def SetChecker(self, checker):
513
 
        "D-Bus setter method"
514
 
        self.checker_command = checker
515
 
    
516
 
    # SetHost - method
517
 
    @dbus.service.method(_interface, in_signature="s")
518
 
    def SetHost(self, host):
519
 
        "D-Bus setter method"
520
 
        self.host = host
521
 
    
522
 
    # SetInterval - method
523
 
    @dbus.service.method(_interface, in_signature="t")
524
 
    def SetInterval(self, milliseconds):
525
 
        self.interval = datetime.timdeelta(0, 0, 0, milliseconds)
526
 
    
527
 
    # SetTimeout - method
528
 
    @dbus.service.method(_interface, in_signature="t")
529
 
    def SetTimeout(self, milliseconds):
530
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
531
 
    
532
 
    # SetSecret - method
533
 
    @dbus.service.method(_interface, in_signature="ay",
534
 
                         byte_arrays=True)
535
 
    def SetSecret(self, secret):
536
 
        "D-Bus setter method"
537
 
        self.secret = str(secret)
538
 
    
539
 
    # Start - method
540
 
    Start = dbus.service.method(_interface)(start)
541
 
    Start.__name__ = "Start"
542
 
    
543
 
    # StartChecker - method
544
 
    StartChecker = dbus.service.method(_interface)(start_checker)
545
 
    StartChecker.__name__ = "StartChecker"
546
 
    
547
 
    # StateChanged - signal
548
 
    @dbus.service.signal(_interface, signature="b")
549
 
    def StateChanged(self, started):
550
 
        "D-Bus signal"
551
 
        pass
552
 
    
553
 
    # StillValid - method
554
 
    StillValid = (dbus.service.method(_interface, out_signature="b")
555
 
                  (still_valid))
556
 
    StillValid.__name__ = "StillValid"
557
 
    
558
 
    # Stop - method
559
 
    Stop = dbus.service.method(_interface)(stop)
560
 
    Stop.__name__ = "Stop"
561
 
    
562
 
    # StopChecker - method
563
 
    StopChecker = dbus.service.method(_interface)(stop_checker)
564
 
    StopChecker.__name__ = "StopChecker"
565
 
    
566
 
    # TimeoutChanged - signal
567
 
    @dbus.service.signal(_interface, signature="t")
568
 
    def TimeoutChanged(self, t):
569
 
        "D-Bus signal"
570
 
        pass
571
 
    
572
 
    del _datetime_to_dbus_struct
573
 
    del _interface
 
246
            return now < (self.last_seen + self.timeout)
574
247
 
575
248
 
576
249
def peer_certificate(session):
577
 
    "Return the peer's OpenPGP certificate as a bytestring"
578
250
    # If not an OpenPGP certificate...
579
 
    if (gnutls.library.functions
580
 
        .gnutls_certificate_type_get(session._c_object)
581
 
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
251
    if gnutls.library.functions.gnutls_certificate_type_get\
 
252
            (session._c_object) \
 
253
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
582
254
        # ...do the normal thing
583
255
        return session.peer_certificate
584
256
    list_size = ctypes.c_uint()
585
 
    cert_list = (gnutls.library.functions
586
 
                 .gnutls_certificate_get_peers
587
 
                 (session._c_object, ctypes.byref(list_size)))
 
257
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
258
        (session._c_object, ctypes.byref(list_size))
588
259
    if list_size.value == 0:
589
260
        return None
590
261
    cert = cert_list[0]
592
263
 
593
264
 
594
265
def fingerprint(openpgp):
595
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
596
 
    # New GnuTLS "datum" with the OpenPGP public key
597
 
    datum = (gnutls.library.types
598
 
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
599
 
                                         ctypes.POINTER
600
 
                                         (ctypes.c_ubyte)),
601
 
                             ctypes.c_uint(len(openpgp))))
602
266
    # New empty GnuTLS certificate
603
267
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
604
 
    (gnutls.library.functions
605
 
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
268
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
269
        (ctypes.byref(crt))
 
270
    # New GnuTLS "datum" with the OpenPGP public key
 
271
    datum = gnutls.library.types.gnutls_datum_t\
 
272
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
273
                     ctypes.POINTER(ctypes.c_ubyte)),
 
274
         ctypes.c_uint(len(openpgp)))
606
275
    # Import the OpenPGP public key into the certificate
607
 
    (gnutls.library.functions
608
 
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
609
 
                                gnutls.library.constants
610
 
                                .GNUTLS_OPENPGP_FMT_RAW))
611
 
    # Verify the self signature in the key
612
 
    crtverify = ctypes.c_uint()
613
 
    (gnutls.library.functions
614
 
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
615
 
    if crtverify.value != 0:
616
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
617
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
276
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
277
        (crt,
 
278
         ctypes.byref(datum),
 
279
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
618
280
    # New buffer for the fingerprint
619
 
    buf = ctypes.create_string_buffer(20)
620
 
    buf_len = ctypes.c_size_t()
 
281
    buffer = ctypes.create_string_buffer(20)
 
282
    buffer_length = ctypes.c_size_t()
621
283
    # Get the fingerprint from the certificate into the buffer
622
 
    (gnutls.library.functions
623
 
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
624
 
                                         ctypes.byref(buf_len)))
 
284
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
285
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
625
286
    # Deinit the certificate
626
287
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
627
288
    # Convert the buffer to a Python bytestring
628
 
    fpr = ctypes.string_at(buf, buf_len.value)
 
289
    fpr = ctypes.string_at(buffer, buffer_length.value)
629
290
    # Convert the bytestring to hexadecimal notation
630
291
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
631
292
    return hex_fpr
632
293
 
633
294
 
634
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
295
class tcp_handler(SocketServer.BaseRequestHandler, object):
635
296
    """A TCP request handler class.
636
297
    Instantiated by IPv6_TCPServer for each request to handle it.
637
298
    Note: This will run in its own forked process."""
638
299
    
639
300
    def handle(self):
640
 
        logger.info(u"TCP connection from: %s",
641
 
                    unicode(self.client_address))
642
 
        session = (gnutls.connection
643
 
                   .ClientSession(self.request,
644
 
                                  gnutls.connection
645
 
                                  .X509Credentials()))
646
 
        
647
 
        line = self.request.makefile().readline()
648
 
        logger.debug(u"Protocol version: %r", line)
649
 
        try:
650
 
            if int(line.strip().split()[0]) > 1:
651
 
                raise RuntimeError
652
 
        except (ValueError, IndexError, RuntimeError), error:
653
 
            logger.error(u"Unknown protocol version: %s", error)
654
 
            return
655
 
        
656
 
        # Note: gnutls.connection.X509Credentials is really a generic
657
 
        # GnuTLS certificate credentials object so long as no X.509
658
 
        # keys are added to it.  Therefore, we can use it here despite
659
 
        # using OpenPGP certificates.
 
301
        if debug:
 
302
            sys.stderr.write(u"TCP request came\n")
 
303
            sys.stderr.write(u"Request: %s\n" % self.request)
 
304
            sys.stderr.write(u"Client Address: %s\n"
 
305
                             % unicode(self.client_address))
 
306
            sys.stderr.write(u"Server: %s\n" % self.server)
 
307
        session = gnutls.connection.ClientSession(self.request,
 
308
                                                  gnutls.connection.\
 
309
                                                  X509Credentials())
660
310
        
661
311
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
662
312
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
663
313
        #                "+DHE-DSS"))
664
 
        # Use a fallback default, since this MUST be set.
665
 
        priority = self.server.settings.get("priority", "NORMAL")
666
 
        (gnutls.library.functions
667
 
         .gnutls_priority_set_direct(session._c_object,
668
 
                                     priority, None))
 
314
        priority = "SECURE256"
 
315
        
 
316
        gnutls.library.functions.gnutls_priority_set_direct\
 
317
            (session._c_object, priority, None);
669
318
        
670
319
        try:
671
320
            session.handshake()
672
321
        except gnutls.errors.GNUTLSError, error:
673
 
            logger.warning(u"Handshake failed: %s", error)
 
322
            if debug:
 
323
                sys.stderr.write(u"Handshake failed: %s\n" % error)
674
324
            # Do not run session.bye() here: the session is not
675
325
            # established.  Just abandon the request.
676
326
            return
677
327
        try:
678
328
            fpr = fingerprint(peer_certificate(session))
679
329
        except (TypeError, gnutls.errors.GNUTLSError), error:
680
 
            logger.warning(u"Bad certificate: %s", error)
 
330
            if debug:
 
331
                sys.stderr.write(u"Bad certificate: %s\n" % error)
681
332
            session.bye()
682
333
            return
683
 
        logger.debug(u"Fingerprint: %s", fpr)
684
 
        for c in self.server.clients:
 
334
        if debug:
 
335
            sys.stderr.write(u"Fingerprint: %s\n" % fpr)
 
336
        client = None
 
337
        for c in clients:
685
338
            if c.fingerprint == fpr:
686
339
                client = c
687
340
                break
688
 
        else:
689
 
            logger.warning(u"Client not found for fingerprint: %s",
690
 
                           fpr)
691
 
            session.bye()
692
 
            return
693
341
        # Have to check if client.still_valid(), since it is possible
694
342
        # that the client timed out while establishing the GnuTLS
695
343
        # session.
696
 
        if not client.still_valid():
697
 
            logger.warning(u"Client %(name)s is invalid",
698
 
                           vars(client))
 
344
        if (not client) or (not client.still_valid()):
 
345
            if debug:
 
346
                if client:
 
347
                    sys.stderr.write(u"Client %(name)s is invalid\n"
 
348
                                     % vars(client))
 
349
                else:
 
350
                    sys.stderr.write(u"Client not found for "
 
351
                                     u"fingerprint: %s\n" % fpr)
699
352
            session.bye()
700
353
            return
701
 
        ## This won't work here, since we're in a fork.
702
 
        # client.bump_timeout()
703
354
        sent_size = 0
704
355
        while sent_size < len(client.secret):
705
356
            sent = session.send(client.secret[sent_size:])
706
 
            logger.debug(u"Sent: %d, remaining: %d",
707
 
                         sent, len(client.secret)
708
 
                         - (sent_size + sent))
 
357
            if debug:
 
358
                sys.stderr.write(u"Sent: %d, remaining: %d\n"
 
359
                                 % (sent, len(client.secret)
 
360
                                    - (sent_size + sent)))
709
361
            sent_size += sent
710
362
        session.bye()
711
363
 
712
364
 
713
 
class IPv6_TCPServer(SocketServer.ForkingMixIn,
714
 
                     SocketServer.TCPServer, object):
 
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
715
366
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
716
367
    Attributes:
717
 
        settings:       Server settings
 
368
        options:        Command line options
718
369
        clients:        Set() of Client objects
719
 
        enabled:        Boolean; whether this server is activated yet
720
370
    """
721
371
    address_family = socket.AF_INET6
722
372
    def __init__(self, *args, **kwargs):
723
 
        if "settings" in kwargs:
724
 
            self.settings = kwargs["settings"]
725
 
            del kwargs["settings"]
 
373
        if "options" in kwargs:
 
374
            self.options = kwargs["options"]
 
375
            del kwargs["options"]
726
376
        if "clients" in kwargs:
727
377
            self.clients = kwargs["clients"]
728
378
            del kwargs["clients"]
729
 
        self.enabled = False
730
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
379
        return super(type(self), self).__init__(*args, **kwargs)
731
380
    def server_bind(self):
732
381
        """This overrides the normal server_bind() function
733
382
        to bind to an interface if one was specified, and also NOT to
734
383
        bind to an address or port if they were not specified."""
735
 
        if self.settings["interface"]:
736
 
            # 25 is from /usr/include/asm-i486/socket.h
737
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
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
738
388
            try:
739
389
                self.socket.setsockopt(socket.SOL_SOCKET,
740
 
                                       SO_BINDTODEVICE,
741
 
                                       self.settings["interface"])
 
390
                                       socket.SO_BINDTODEVICE,
 
391
                                       self.options.interface)
742
392
            except socket.error, error:
743
393
                if error[0] == errno.EPERM:
744
 
                    logger.error(u"No permission to"
745
 
                                 u" bind to interface %s",
746
 
                                 self.settings["interface"])
 
394
                    sys.stderr.write(u"Warning: No permission to" \
 
395
                                     u" bind to interface %s\n"
 
396
                                     % self.options.interface)
747
397
                else:
748
398
                    raise error
749
399
        # Only bind(2) the socket if we really need to.
752
402
                in6addr_any = "::"
753
403
                self.server_address = (in6addr_any,
754
404
                                       self.server_address[1])
755
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
756
406
                self.server_address = (self.server_address[0],
757
407
                                       0)
758
 
#                 if self.settings["interface"]:
759
 
#                     self.server_address = (self.server_address[0],
760
 
#                                            0, # port
761
 
#                                            0, # flowinfo
762
 
#                                            if_nametoindex
763
 
#                                            (self.settings
764
 
#                                             ["interface"]))
765
 
            return super(IPv6_TCPServer, self).server_bind()
766
 
    def server_activate(self):
767
 
        if self.enabled:
768
 
            return super(IPv6_TCPServer, self).server_activate()
769
 
    def enable(self):
770
 
        self.enabled = True
 
408
            return super(type(self), self).server_bind()
771
409
 
772
410
 
773
411
def string_to_delta(interval):
783
421
    datetime.timedelta(1)
784
422
    >>> string_to_delta(u'1w')
785
423
    datetime.timedelta(7)
786
 
    >>> string_to_delta('5m 30s')
787
 
    datetime.timedelta(0, 330)
788
424
    """
789
 
    timevalue = datetime.timedelta(0)
790
 
    for s in interval.split():
791
 
        try:
792
 
            suffix = unicode(s[-1])
793
 
            value = int(s[:-1])
794
 
            if suffix == u"d":
795
 
                delta = datetime.timedelta(value)
796
 
            elif suffix == u"s":
797
 
                delta = datetime.timedelta(0, value)
798
 
            elif suffix == u"m":
799
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
800
 
            elif suffix == u"h":
801
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
802
 
            elif suffix == u"w":
803
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
804
 
            else:
805
 
                raise ValueError
806
 
        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:
807
439
            raise ValueError
808
 
        timevalue += delta
809
 
    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
    if debug:
 
457
        sys.stderr.write(u"Adding service '%s' of type '%s' ...\n"
 
458
                         % (serviceName, serviceType))
 
459
    
 
460
    group.AddService(
 
461
            serviceInterface,           # interface
 
462
            avahi.PROTO_INET6,          # protocol
 
463
            dbus.UInt32(0),             # flags
 
464
            serviceName, serviceType,
 
465
            domain, host,
 
466
            dbus.UInt16(servicePort),
 
467
            avahi.string_array_to_txt_array(serviceTXT))
 
468
    group.Commit()
 
469
 
 
470
 
 
471
def remove_service():
 
472
    """From the Avahi server example code"""
 
473
    global group
 
474
    
 
475
    if not group is None:
 
476
        group.Reset()
810
477
 
811
478
 
812
479
def server_state_changed(state):
813
 
    """Derived from the Avahi example code"""
 
480
    """From the Avahi server example code"""
814
481
    if state == avahi.SERVER_COLLISION:
815
 
        logger.error(u"Zeroconf server name collision")
816
 
        service.remove()
 
482
        sys.stderr.write(u"WARNING: Server name collision\n")
 
483
        remove_service()
817
484
    elif state == avahi.SERVER_RUNNING:
818
 
        service.add()
 
485
        add_service()
819
486
 
820
487
 
821
488
def entry_group_state_changed(state, error):
822
 
    """Derived from the Avahi example code"""
823
 
    logger.debug(u"Avahi state change: %i", state)
 
489
    """From the Avahi server example code"""
 
490
    global serviceName, server, rename_count
 
491
    
 
492
    if debug:
 
493
        sys.stderr.write(u"state change: %i\n" % state)
824
494
    
825
495
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
826
 
        logger.debug(u"Zeroconf service established.")
 
496
        if debug:
 
497
            sys.stderr.write(u"Service established.\n")
827
498
    elif state == avahi.ENTRY_GROUP_COLLISION:
828
 
        logger.warning(u"Zeroconf service name collision.")
829
 
        service.rename()
 
499
        
 
500
        rename_count = rename_count - 1
 
501
        if rename_count > 0:
 
502
            name = server.GetAlternativeServiceName(name)
 
503
            sys.stderr.write(u"WARNING: Service name collision, "
 
504
                             u"changing name to '%s' ...\n" % name)
 
505
            remove_service()
 
506
            add_service()
 
507
            
 
508
        else:
 
509
            sys.stderr.write(u"ERROR: No suitable service name found "
 
510
                             u"after %i retries, exiting.\n"
 
511
                             % n_rename)
 
512
            main_loop.quit()
830
513
    elif state == avahi.ENTRY_GROUP_FAILURE:
831
 
        logger.critical(u"Avahi: Error in group state changed %s",
832
 
                        unicode(error))
833
 
        raise AvahiGroupError("State changed: %s", str(error))
 
514
        sys.stderr.write(u"Error in group state changed %s\n"
 
515
                         % unicode(error))
 
516
        main_loop.quit()
 
517
        return
 
518
 
834
519
 
835
520
def if_nametoindex(interface):
836
 
    """Call the C function if_nametoindex(), or equivalent"""
837
 
    global if_nametoindex
 
521
    """Call the C function if_nametoindex()"""
838
522
    try:
839
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
840
 
                          (ctypes.util.find_library("c"))
841
 
                          .if_nametoindex)
 
523
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
524
        return libc.if_nametoindex(interface)
842
525
    except (OSError, AttributeError):
843
526
        if "struct" not in sys.modules:
844
527
            import struct
845
528
        if "fcntl" not in sys.modules:
846
529
            import fcntl
847
 
        def if_nametoindex(interface):
848
 
            "Get an interface index the hard way, i.e. using fcntl()"
849
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
850
 
            with closing(socket.socket()) as s:
851
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
852
 
                                    struct.pack("16s16x", interface))
853
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
854
 
            return interface_index
855
 
    return if_nametoindex(interface)
856
 
 
857
 
 
858
 
def daemon(nochdir = False, noclose = False):
859
 
    """See daemon(3).  Standard BSD Unix function.
860
 
    This should really exist as os.daemon, but it doesn't (yet)."""
861
 
    if os.fork():
862
 
        sys.exit()
863
 
    os.setsid()
864
 
    if not nochdir:
865
 
        os.chdir("/")
866
 
    if os.fork():
867
 
        sys.exit()
868
 
    if not noclose:
869
 
        # Close all standard open file descriptors
870
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
871
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
872
 
            raise OSError(errno.ENODEV,
873
 
                          "/dev/null not a character device")
874
 
        os.dup2(null, sys.stdin.fileno())
875
 
        os.dup2(null, sys.stdout.fileno())
876
 
        os.dup2(null, sys.stderr.fileno())
877
 
        if null > 2:
878
 
            os.close(null)
879
 
 
880
 
 
881
 
def main():
882
 
    parser = OptionParser(version = "%%prog %s" % version)
 
530
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
531
        s = socket.socket()
 
532
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
533
                            struct.pack("16s16x", interface))
 
534
        s.close()
 
535
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
536
        return interface_index
 
537
 
 
538
 
 
539
if __name__ == '__main__':
 
540
    parser = OptionParser()
883
541
    parser.add_option("-i", "--interface", type="string",
884
 
                      metavar="IF", help="Bind to interface IF")
885
 
    parser.add_option("-a", "--address", type="string",
886
 
                      help="Address to listen for requests on")
887
 
    parser.add_option("-p", "--port", type="int",
 
542
                      default=None, metavar="IF",
 
543
                      help="Bind to interface IF")
 
544
    parser.add_option("--cert", type="string", default="cert.pem",
 
545
                      metavar="FILE",
 
546
                      help="Public key certificate PEM file to use")
 
547
    parser.add_option("--key", type="string", default="key.pem",
 
548
                      metavar="FILE",
 
549
                      help="Private key PEM file to use")
 
550
    parser.add_option("--ca", type="string", default="ca.pem",
 
551
                      metavar="FILE",
 
552
                      help="Certificate Authority certificate PEM file to use")
 
553
    parser.add_option("--crl", type="string", default="crl.pem",
 
554
                      metavar="FILE",
 
555
                      help="Certificate Revokation List PEM file to use")
 
556
    parser.add_option("-p", "--port", type="int", default=None,
888
557
                      help="Port number to receive requests on")
 
558
    parser.add_option("--timeout", type="string", # Parsed later
 
559
                      default="1h",
 
560
                      help="Amount of downtime allowed for clients")
 
561
    parser.add_option("--interval", type="string", # Parsed later
 
562
                      default="5m",
 
563
                      help="How often to check that a client is up")
889
564
    parser.add_option("--check", action="store_true", default=False,
890
565
                      help="Run self-test")
891
 
    parser.add_option("--debug", action="store_true",
892
 
                      help="Debug mode; run in foreground and log to"
893
 
                      " terminal")
894
 
    parser.add_option("--priority", type="string", help="GnuTLS"
895
 
                      " priority string (see GnuTLS documentation)")
896
 
    parser.add_option("--servicename", type="string", metavar="NAME",
897
 
                      help="Zeroconf service name")
898
 
    parser.add_option("--configdir", type="string",
899
 
                      default="/etc/mandos", metavar="DIR",
900
 
                      help="Directory to search for configuration"
901
 
                      " files")
902
 
    options = parser.parse_args()[0]
 
566
    parser.add_option("--debug", action="store_true", default=False,
 
567
                      help="Debug mode")
 
568
    (options, args) = parser.parse_args()
903
569
    
904
570
    if options.check:
905
571
        import doctest
906
572
        doctest.testmod()
907
573
        sys.exit()
908
574
    
909
 
    # Default values for config file for server-global settings
910
 
    server_defaults = { "interface": "",
911
 
                        "address": "",
912
 
                        "port": "",
913
 
                        "debug": "False",
914
 
                        "priority":
915
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
916
 
                        "servicename": "Mandos",
917
 
                        }
918
 
    
919
 
    # Parse config file for server-global settings
920
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
921
 
    del server_defaults
922
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
923
 
    # Convert the SafeConfigParser object to a dict
924
 
    server_settings = server_config.defaults()
925
 
    # Use getboolean on the boolean config option
926
 
    server_settings["debug"] = (server_config.getboolean
927
 
                                ("DEFAULT", "debug"))
928
 
    del server_config
929
 
    
930
 
    # Override the settings from the config file with command line
931
 
    # options, if set.
932
 
    for option in ("interface", "address", "port", "debug",
933
 
                   "priority", "servicename", "configdir"):
934
 
        value = getattr(options, option)
935
 
        if value is not None:
936
 
            server_settings[option] = value
937
 
    del options
938
 
    # Now we have our good server settings in "server_settings"
939
 
    
940
 
    debug = server_settings["debug"]
941
 
    
942
 
    if not debug:
943
 
        syslogger.setLevel(logging.WARNING)
944
 
        console.setLevel(logging.WARNING)
945
 
    
946
 
    if server_settings["servicename"] != "Mandos":
947
 
        syslogger.setFormatter(logging.Formatter
948
 
                               ('Mandos (%s): %%(levelname)s:'
949
 
                                ' %%(message)s'
950
 
                                % server_settings["servicename"]))
951
 
    
952
 
    # Parse config file with clients
953
 
    client_defaults = { "timeout": "1h",
954
 
                        "interval": "5m",
955
 
                        "checker": "fping -q -- %(host)s",
956
 
                        "host": "",
957
 
                        }
958
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
959
 
    client_config.read(os.path.join(server_settings["configdir"],
960
 
                                    "clients.conf"))
961
 
    
962
 
    clients = Set()
963
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
964
 
                                 server_settings["port"]),
965
 
                                TCP_handler,
966
 
                                settings=server_settings,
967
 
                                clients=clients)
968
 
    pidfilename = "/var/run/mandos.pid"
969
 
    try:
970
 
        pidfile = open(pidfilename, "w")
971
 
    except IOError, error:
972
 
        logger.error("Could not open file %r", pidfilename)
973
 
    
974
 
    uid = 65534
975
 
    gid = 65534
976
 
    try:
977
 
        uid = pwd.getpwnam("mandos").pw_uid
978
 
    except KeyError:
979
 
        try:
980
 
            uid = pwd.getpwnam("nobody").pw_uid
981
 
        except KeyError:
982
 
            pass
983
 
    try:
984
 
        gid = pwd.getpwnam("mandos").pw_gid
985
 
    except KeyError:
986
 
        try:
987
 
            gid = pwd.getpwnam("nogroup").pw_gid
988
 
        except KeyError:
989
 
            pass
990
 
    try:
991
 
        os.setuid(uid)
992
 
        os.setgid(gid)
993
 
    except OSError, error:
994
 
        if error[0] != errno.EPERM:
995
 
            raise error
996
 
    
997
 
    global service
998
 
    service = AvahiService(name = server_settings["servicename"],
999
 
                           servicetype = "_mandos._tcp", )
1000
 
    if server_settings["interface"]:
1001
 
        service.interface = (if_nametoindex
1002
 
                             (server_settings["interface"]))
1003
 
    
1004
 
    global main_loop
1005
 
    global bus
1006
 
    global server
1007
 
    # From the Avahi example code
 
575
    # Parse the time arguments
 
576
    try:
 
577
        options.timeout = string_to_delta(options.timeout)
 
578
    except ValueError:
 
579
        parser.error("option --timeout: Unparseable time")
 
580
    try:
 
581
        options.interval = string_to_delta(options.interval)
 
582
    except ValueError:
 
583
        parser.error("option --interval: Unparseable time")
 
584
    
 
585
    # Parse config file
 
586
    defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
 
587
    client_config = ConfigParser.SafeConfigParser(defaults)
 
588
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
 
589
    client_config.read("mandos-clients.conf")
 
590
    
 
591
    # From the Avahi server example code
1008
592
    DBusGMainLoop(set_as_default=True )
1009
593
    main_loop = gobject.MainLoop()
1010
594
    bus = dbus.SystemBus()
1011
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1012
 
                                           avahi.DBUS_PATH_SERVER),
1013
 
                            avahi.DBUS_INTERFACE_SERVER)
 
595
    server = dbus.Interface(
 
596
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
597
            avahi.DBUS_INTERFACE_SERVER )
1014
598
    # End of Avahi example code
1015
 
    bus_name = dbus.service.BusName(u"org.mandos-system.Mandos", bus)
1016
 
    
 
599
    
 
600
    debug = options.debug
 
601
    
 
602
    clients = Set()
1017
603
    def remove_from_clients(client):
1018
604
        clients.remove(client)
1019
605
        if not clients:
1020
 
            logger.critical(u"No clients left, exiting")
1021
 
            sys.exit()
 
606
            if debug:
 
607
                sys.stderr.write(u"No clients left, exiting\n")
 
608
            main_loop.quit()
1022
609
    
1023
 
    clients.update(Set(Client(name = section,
 
610
    clients.update(Set(Client(name=section, options=options,
1024
611
                              stop_hook = remove_from_clients,
1025
 
                              config
1026
 
                              = dict(client_config.items(section)))
 
612
                              **(dict(client_config\
 
613
                                      .items(section))))
1027
614
                       for section in client_config.sections()))
1028
 
    if not clients:
1029
 
        logger.critical(u"No clients defined")
1030
 
        sys.exit(1)
1031
 
    
1032
 
    if debug:
1033
 
        # Redirect stdin so all checkers get /dev/null
1034
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1035
 
        os.dup2(null, sys.stdin.fileno())
1036
 
        if null > 2:
1037
 
            os.close(null)
1038
 
    else:
1039
 
        # No console logging
1040
 
        logger.removeHandler(console)
1041
 
        # Close all input and output, do double fork, etc.
1042
 
        daemon()
1043
 
    
1044
 
    try:
1045
 
        pid = os.getpid()
1046
 
        pidfile.write(str(pid) + "\n")
1047
 
        pidfile.close()
1048
 
        del pidfile
1049
 
    except IOError:
1050
 
        logger.error(u"Could not write to file %r with PID %d",
1051
 
                     pidfilename, pid)
1052
 
    except NameError:
1053
 
        # "pidfile" was never created
1054
 
        pass
1055
 
    del pidfilename
1056
 
    
1057
 
    def cleanup():
1058
 
        "Cleanup function; run on exit"
1059
 
        global group
1060
 
        # From the Avahi example code
1061
 
        if not group is None:
1062
 
            group.Free()
1063
 
            group = None
1064
 
        # End of Avahi example code
1065
 
        
1066
 
        while clients:
1067
 
            client = clients.pop()
1068
 
            client.stop_hook = None
1069
 
            client.stop()
1070
 
    
1071
 
    atexit.register(cleanup)
1072
 
    
1073
 
    if not debug:
1074
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1075
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1076
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1077
 
    
1078
615
    for client in clients:
1079
616
        client.start()
1080
617
    
1081
 
    tcp_server.enable()
1082
 
    tcp_server.server_activate()
1083
 
    
1084
 
    # Find out what port we got
1085
 
    service.port = tcp_server.socket.getsockname()[1]
1086
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
1087
 
                u" scope_id %d" % tcp_server.socket.getsockname())
1088
 
    
1089
 
    #service.interface = tcp_server.socket.getsockname()[3]
1090
 
    
 
618
    tcp_server = IPv6_TCPServer((None, options.port),
 
619
                                tcp_handler,
 
620
                                options=options,
 
621
                                clients=clients)
 
622
    # Find out what random port we got
 
623
    servicePort = tcp_server.socket.getsockname()[1]
 
624
    if debug:
 
625
        sys.stderr.write(u"Now listening on port %d\n" % servicePort)
 
626
    
 
627
    if options.interface is not None:
 
628
        serviceInterface = if_nametoindex(options.interface)
 
629
    
 
630
    # From the Avahi server example code
 
631
    server.connect_to_signal("StateChanged", server_state_changed)
 
632
    server_state_changed(server.GetState())
 
633
    # End of Avahi example code
 
634
    
 
635
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
636
                         lambda *args, **kwargs:
 
637
                         tcp_server.handle_request(*args[2:],
 
638
                                                   **kwargs) or True)
1091
639
    try:
1092
 
        # From the Avahi example code
1093
 
        server.connect_to_signal("StateChanged", server_state_changed)
1094
 
        try:
1095
 
            server_state_changed(server.GetState())
1096
 
        except dbus.exceptions.DBusException, error:
1097
 
            logger.critical(u"DBusException: %s", error)
1098
 
            sys.exit(1)
1099
 
        # End of Avahi example code
1100
 
        
1101
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1102
 
                             lambda *args, **kwargs:
1103
 
                             (tcp_server.handle_request
1104
 
                              (*args[2:], **kwargs) or True))
1105
 
        
1106
 
        logger.debug(u"Starting main loop")
1107
640
        main_loop.run()
1108
 
    except AvahiError, error:
1109
 
        logger.critical(u"AvahiError: %s" + unicode(error))
1110
 
        sys.exit(1)
1111
641
    except KeyboardInterrupt:
1112
 
        if debug:
1113
 
            print
 
642
        print
 
643
    
 
644
    # Cleanup here
1114
645
 
1115
 
if __name__ == '__main__':
1116
 
    main()
 
646
    # From the Avahi server example code
 
647
    if not group is None:
 
648
        group.Free()
 
649
    # End of Avahi example code
 
650
    
 
651
    for client in clients:
 
652
        client.stop_hook = None
 
653
        client.stop()