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  • Committer: Teddy Hogeborn
  • Date: 2009-04-17 01:16:37 UTC
  • Revision ID: teddy@fukt.bsnet.se-20090417011637-bcqjpm7fskm4370v
Code cleanup and one bug fix.

* mandos (Client.enable): Bug fix: Do not enable if already enabled.
  (MandosServer.__init__): Create empty set of clients if none passed.
  (main): Do not create clients set; do not pass a clients set to
          MandosServer.  Use tcp_server.clients throughout.

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mandos
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1
#!/usr/bin/python
2
 
 
3
 
from __future__ import division
4
 
 
5
 
import SocketServer
 
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
6
37
import socket
7
 
import select
8
 
from optparse import OptionParser
 
38
import optparse
9
39
import datetime
10
40
import errno
11
41
import gnutls.crypto
14
44
import gnutls.library.functions
15
45
import gnutls.library.constants
16
46
import gnutls.library.types
17
 
import ConfigParser
 
47
import ConfigParser as configparser
18
48
import sys
19
49
import re
20
50
import os
21
51
import signal
22
 
from sets import Set
23
52
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
24
62
 
25
63
import dbus
 
64
import dbus.service
26
65
import gobject
27
66
import avahi
28
67
from dbus.mainloop.glib import DBusGMainLoop
29
68
import ctypes
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
 
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 = "1.0.8"
 
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())
54
225
 
55
226
 
56
227
class Client(object):
57
228
    """A representation of a client host served by this server.
 
229
    
58
230
    Attributes:
59
 
    name:      string; from the config file, used in log messages
 
231
    name:       string; from the config file, used in log messages and
 
232
                        D-Bus identifiers
60
233
    fingerprint: string (40 or 32 hexadecimal digits); used to
61
234
                 uniquely identify the client
62
 
    secret:    bytestring; sent verbatim (over TLS) to client
63
 
    fqdn:      string (FQDN); available for use by the checker command
64
 
    created:   datetime.datetime()
65
 
    last_seen: datetime.datetime() or None if not yet seen
66
 
    timeout:   datetime.timedelta(); How long from last_seen until
67
 
                                     this client is invalid
68
 
    interval:  datetime.timedelta(); How often to start a new checker
69
 
    stop_hook: If set, called by stop() as stop_hook(self)
70
 
    checker:   subprocess.Popen(); a running checker process used
71
 
                                   to see if the client lives.
72
 
                                   Is None if no process is running.
 
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.
73
248
    checker_initiator_tag: a gobject event source tag, or None
74
 
    stop_initiator_tag:    - '' -
 
249
    disable_initiator_tag:    - '' -
75
250
    checker_callback_tag:  - '' -
76
251
    checker_command: string; External command which is run to check if
77
 
                     client lives.  %()s expansions are done at
 
252
                     client lives.  %() expansions are done at
78
253
                     runtime with vars(self) as dict, so that for
79
254
                     instance %(name)s can be used in the 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: - '' -
 
255
    current_checker_command: string; current running checker_command
85
256
    """
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):
 
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."""
112
277
        self.name = name
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
 
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
138
305
        self.checker = None
139
306
        self.checker_initiator_tag = None
140
 
        self.stop_initiator_tag = None
 
307
        self.disable_initiator_tag = None
141
308
        self.checker_callback_tag = None
142
 
        self.check_command = checker
143
 
    def start(self):
144
 
        """Start this clients checker and timeout hooks"""
 
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()
145
319
        # Schedule a new checker to be started an 'interval' from now,
146
320
        # and every interval from then on.
147
 
        self.checker_initiator_tag = gobject.timeout_add\
148
 
                                     (self._interval_milliseconds,
149
 
                                      self.start_checker)
 
321
        self.checker_initiator_tag = (gobject.timeout_add
 
322
                                      (self.interval_milliseconds(),
 
323
                                       self.start_checker))
150
324
        # Also start a new checker *right now*.
151
325
        self.start_checker()
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:
 
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):
166
341
            gobject.source_remove(self.checker_initiator_tag)
167
342
            self.checker_initiator_tag = None
168
343
        self.stop_checker()
169
 
        if self.stop_hook:
170
 
            self.stop_hook(self)
 
344
        if self.disable_hook:
 
345
            self.disable_hook(self)
 
346
        self.enabled = False
171
347
        # Do not run this again if called by a gobject.timeout_add
172
348
        return False
 
349
    
173
350
    def __del__(self):
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):
 
351
        self.disable_hook = None
 
352
        self.disable()
 
353
    
 
354
    def checker_callback(self, pid, condition, command):
185
355
        """The checker has completed, so take appropriate actions."""
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):
 
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:
197
368
            logger.warning(u"Checker for %(name)s crashed?",
198
369
                           vars(self))
199
 
        else:
200
 
            logger.debug(u"Checker for %(name)s failed",
201
 
                         vars(self))
202
 
            self.checker = None
203
 
        self.checker_callback_tag = None
 
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
    
204
383
    def start_checker(self):
205
384
        """Start a new checker subprocess if one is not running.
 
385
        
206
386
        If a checker already exists, leave it running and do
207
387
        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
208
406
        if self.checker is None:
209
 
            logger.debug(u"Starting checker for %s",
210
 
                         self.name)
211
407
            try:
212
 
                command = self.check_command % self.fqdn
 
408
                # In case checker_command has exactly one % operator
 
409
                command = self.checker_command % self.host
213
410
            except TypeError:
214
 
                escaped_attrs = dict((key, re.escape(str(val)))
 
411
                # Escape attributes for the shell
 
412
                escaped_attrs = dict((key,
 
413
                                      re.escape(unicode(str(val),
 
414
                                                        errors=
 
415
                                                        u'replace')))
215
416
                                     for key, val in
216
417
                                     vars(self).iteritems())
217
418
                try:
218
 
                    command = self.check_command % escaped_attrs
 
419
                    command = self.checker_command % escaped_attrs
219
420
                except TypeError, error:
220
 
                    logger.critical(u'Could not format string "%s": %s',
221
 
                                    self.check_command, error)
 
421
                    logger.error(u'Could not format string "%s":'
 
422
                                 u' %s', self.checker_command, error)
222
423
                    return True # Try again later
 
424
            self.current_checker_command = command
223
425
            try:
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:
 
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:
234
446
                logger.error(u"Failed to start subprocess: %s",
235
447
                             error)
236
448
        # Re-run this periodically if run by gobject.timeout_add
237
449
        return True
 
450
    
238
451
    def stop_checker(self):
239
452
        """Force the checker process, if any, to stop."""
240
 
        if not hasattr(self, "checker") or self.checker is None:
 
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:
241
457
            return
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)
 
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
247
467
        self.checker = None
248
 
    def still_valid(self, now=None):
 
468
    
 
469
    def still_valid(self):
249
470
        """Has the timeout not yet passed for this client?"""
250
 
        if now is None:
251
 
            now = datetime.datetime.now()
252
 
        if self.last_seen is None:
 
471
        if not getattr(self, u"enabled", False):
 
472
            return False
 
473
        now = datetime.datetime.utcnow()
 
474
        if self.last_checked_ok is None:
253
475
            return now < (self.created + self.timeout)
254
476
        else:
255
 
            return now < (self.last_seen + self.timeout)
256
 
 
257
 
 
258
 
def peer_certificate(session):
259
 
    # If not an OpenPGP certificate...
260
 
    if gnutls.library.functions.gnutls_certificate_type_get\
261
 
            (session._c_object) \
262
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
263
 
        # ...do the normal thing
264
 
        return session.peer_certificate
265
 
    list_size = ctypes.c_uint()
266
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
267
 
        (session._c_object, ctypes.byref(list_size))
268
 
    if list_size.value == 0:
269
 
        return None
270
 
    cert = cert_list[0]
271
 
    return ctypes.string_at(cert.data, cert.size)
272
 
 
273
 
 
274
 
def fingerprint(openpgp):
275
 
    # New empty GnuTLS certificate
276
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
277
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
278
 
        (ctypes.byref(crt))
279
 
    # New GnuTLS "datum" with the OpenPGP public key
280
 
    datum = gnutls.library.types.gnutls_datum_t\
281
 
        (ctypes.cast(ctypes.c_char_p(openpgp),
282
 
                     ctypes.POINTER(ctypes.c_ubyte)),
283
 
         ctypes.c_uint(len(openpgp)))
284
 
    # Import the OpenPGP public key into the certificate
285
 
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
286
 
        (crt,
287
 
         ctypes.byref(datum),
288
 
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
289
 
    # New buffer for the fingerprint
290
 
    buffer = ctypes.create_string_buffer(20)
291
 
    buffer_length = ctypes.c_size_t()
292
 
    # Get the fingerprint from the certificate into the buffer
293
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
294
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
295
 
    # Deinit the certificate
296
 
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
297
 
    # Convert the buffer to a Python bytestring
298
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
299
 
    # Convert the bytestring to hexadecimal notation
300
 
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
301
 
    return hex_fpr
302
 
 
303
 
 
304
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
305
 
    """A TCP request handler class.
306
 
    Instantiated by IPv6_TCPServer for each request to handle it.
 
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.
307
754
    Note: This will run in its own forked process."""
308
755
    
309
756
    def handle(self):
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))
 
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
350
813
            else:
351
 
                logger.debug(u"Client not found for fingerprint: %s",
352
 
                             fpr)
 
814
                ipc.write(u"NOTFOUND %s\n" % fpr)
 
815
                session.bye()
 
816
                return
 
817
            # Have to check if client.still_valid(), since it is
 
818
            # possible that the client timed out while establishing
 
819
            # the GnuTLS session.
 
820
            if not client.still_valid():
 
821
                ipc.write(u"INVALID %s\n" % client.name)
 
822
                session.bye()
 
823
                return
 
824
            ipc.write(u"SENDING %s\n" % client.name)
 
825
            sent_size = 0
 
826
            while sent_size < len(client.secret):
 
827
                sent = session.send(client.secret[sent_size:])
 
828
                logger.debug(u"Sent: %d, remaining: %d",
 
829
                             sent, len(client.secret)
 
830
                             - (sent_size + sent))
 
831
                sent_size += sent
353
832
            session.bye()
354
 
            return
355
 
        sent_size = 0
356
 
        while sent_size < len(client.secret):
357
 
            sent = session.send(client.secret[sent_size:])
358
 
            logger.debug(u"Sent: %d, remaining: %d",
359
 
                         sent, len(client.secret)
360
 
                         - (sent_size + sent))
361
 
            sent_size += sent
362
 
        session.bye()
363
 
 
364
 
 
365
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
366
 
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
833
    
 
834
    @staticmethod
 
835
    def peer_certificate(session):
 
836
        "Return the peer's OpenPGP certificate as a bytestring"
 
837
        # If not an OpenPGP certificate...
 
838
        if (gnutls.library.functions
 
839
            .gnutls_certificate_type_get(session._c_object)
 
840
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
841
            # ...do the normal thing
 
842
            return session.peer_certificate
 
843
        list_size = ctypes.c_uint(1)
 
844
        cert_list = (gnutls.library.functions
 
845
                     .gnutls_certificate_get_peers
 
846
                     (session._c_object, ctypes.byref(list_size)))
 
847
        if not bool(cert_list) and list_size.value != 0:
 
848
            raise gnutls.errors.GNUTLSError(u"error getting peer"
 
849
                                            u" certificate")
 
850
        if list_size.value == 0:
 
851
            return None
 
852
        cert = cert_list[0]
 
853
        return ctypes.string_at(cert.data, cert.size)
 
854
    
 
855
    @staticmethod
 
856
    def fingerprint(openpgp):
 
857
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
 
858
        # New GnuTLS "datum" with the OpenPGP public key
 
859
        datum = (gnutls.library.types
 
860
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
861
                                             ctypes.POINTER
 
862
                                             (ctypes.c_ubyte)),
 
863
                                 ctypes.c_uint(len(openpgp))))
 
864
        # New empty GnuTLS certificate
 
865
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
866
        (gnutls.library.functions
 
867
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
868
        # Import the OpenPGP public key into the certificate
 
869
        (gnutls.library.functions
 
870
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
871
                                    gnutls.library.constants
 
872
                                    .GNUTLS_OPENPGP_FMT_RAW))
 
873
        # Verify the self signature in the key
 
874
        crtverify = ctypes.c_uint()
 
875
        (gnutls.library.functions
 
876
         .gnutls_openpgp_crt_verify_self(crt, 0,
 
877
                                         ctypes.byref(crtverify)))
 
878
        if crtverify.value != 0:
 
879
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
880
            raise (gnutls.errors.CertificateSecurityError
 
881
                   (u"Verify failed"))
 
882
        # New buffer for the fingerprint
 
883
        buf = ctypes.create_string_buffer(20)
 
884
        buf_len = ctypes.c_size_t()
 
885
        # Get the fingerprint from the certificate into the buffer
 
886
        (gnutls.library.functions
 
887
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
888
                                             ctypes.byref(buf_len)))
 
889
        # Deinit the certificate
 
890
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
891
        # Convert the buffer to a Python bytestring
 
892
        fpr = ctypes.string_at(buf, buf_len.value)
 
893
        # Convert the bytestring to hexadecimal notation
 
894
        hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
895
        return hex_fpr
 
896
 
 
897
 
 
898
class ForkingMixInWithPipe(socketserver.ForkingMixIn, object):
 
899
    """Like socketserver.ForkingMixIn, but also pass a pipe."""
 
900
    def process_request(self, request, client_address):
 
901
        """Overrides and wraps the original process_request().
 
902
        
 
903
        This function creates a new pipe in self.pipe 
 
904
        """
 
905
        self.pipe = os.pipe()
 
906
        super(ForkingMixInWithPipe,
 
907
              self).process_request(request, client_address)
 
908
        os.close(self.pipe[1])  # close write end
 
909
        self.add_pipe(self.pipe[0])
 
910
    def add_pipe(self, pipe):
 
911
        """Dummy function; override as necessary"""
 
912
        os.close(pipe)
 
913
 
 
914
 
 
915
class IPv6_TCPServer(ForkingMixInWithPipe,
 
916
                     socketserver.TCPServer, object):
 
917
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
918
    
367
919
    Attributes:
368
 
        options:        Command line options
369
 
        clients:        Set() of Client objects
 
920
        enabled:        Boolean; whether this server is activated yet
 
921
        interface:      None or a network interface name (string)
 
922
        use_ipv6:       Boolean; to use IPv6 or not
370
923
    """
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)
 
924
    def __init__(self, server_address, RequestHandlerClass,
 
925
                 interface=None, use_ipv6=True):
 
926
        self.interface = interface
 
927
        if use_ipv6:
 
928
            self.address_family = socket.AF_INET6
 
929
        socketserver.TCPServer.__init__(self, server_address,
 
930
                                        RequestHandlerClass)
380
931
    def server_bind(self):
381
932
        """This overrides the normal server_bind() function
382
933
        to bind to an interface if one was specified, and also NOT to
383
934
        bind to an address or port if they were not specified."""
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
 
935
        if self.interface is not None:
 
936
            if SO_BINDTODEVICE is None:
 
937
                logger.error(u"SO_BINDTODEVICE does not exist;"
 
938
                             u" cannot bind to interface %s",
 
939
                             self.interface)
 
940
            else:
 
941
                try:
 
942
                    self.socket.setsockopt(socket.SOL_SOCKET,
 
943
                                           SO_BINDTODEVICE,
 
944
                                           str(self.interface
 
945
                                               + u'\0'))
 
946
                except socket.error, error:
 
947
                    if error[0] == errno.EPERM:
 
948
                        logger.error(u"No permission to"
 
949
                                     u" bind to interface %s",
 
950
                                     self.interface)
 
951
                    elif error[0] == errno.ENOPROTOOPT:
 
952
                        logger.error(u"SO_BINDTODEVICE not available;"
 
953
                                     u" cannot bind to interface %s",
 
954
                                     self.interface)
 
955
                    else:
 
956
                        raise
399
957
        # Only bind(2) the socket if we really need to.
400
958
        if self.server_address[0] or self.server_address[1]:
401
959
            if not self.server_address[0]:
402
 
                in6addr_any = "::"
403
 
                self.server_address = (in6addr_any,
 
960
                if self.address_family == socket.AF_INET6:
 
961
                    any_address = u"::" # in6addr_any
 
962
                else:
 
963
                    any_address = socket.INADDR_ANY
 
964
                self.server_address = (any_address,
404
965
                                       self.server_address[1])
405
 
            elif self.server_address[1] is None:
 
966
            elif not self.server_address[1]:
406
967
                self.server_address = (self.server_address[0],
407
968
                                       0)
408
 
            return super(type(self), self).server_bind()
 
969
#                 if self.interface:
 
970
#                     self.server_address = (self.server_address[0],
 
971
#                                            0, # port
 
972
#                                            0, # flowinfo
 
973
#                                            if_nametoindex
 
974
#                                            (self.interface))
 
975
            return socketserver.TCPServer.server_bind(self)
 
976
 
 
977
 
 
978
class MandosServer(IPv6_TCPServer):
 
979
    """Mandos server.
 
980
    
 
981
    Attributes:
 
982
        clients:        set of Client objects
 
983
        gnutls_priority GnuTLS priority string
 
984
        use_dbus:       Boolean; to emit D-Bus signals or not
 
985
        clients:        set of Client objects
 
986
        gnutls_priority GnuTLS priority string
 
987
        use_dbus:       Boolean; to emit D-Bus signals or not
 
988
    
 
989
    Assumes a gobject.MainLoop event loop.
 
990
    """
 
991
    def __init__(self, server_address, RequestHandlerClass,
 
992
                 interface=None, use_ipv6=True, clients=None,
 
993
                 gnutls_priority=None, use_dbus=True):
 
994
        self.enabled = False
 
995
        self.clients = clients
 
996
        if self.clients is None:
 
997
            self.clients = set()
 
998
        self.use_dbus = use_dbus
 
999
        self.gnutls_priority = gnutls_priority
 
1000
        IPv6_TCPServer.__init__(self, server_address,
 
1001
                                RequestHandlerClass,
 
1002
                                interface = interface,
 
1003
                                use_ipv6 = use_ipv6)
 
1004
    def server_activate(self):
 
1005
        if self.enabled:
 
1006
            return socketserver.TCPServer.server_activate(self)
 
1007
    def enable(self):
 
1008
        self.enabled = True
 
1009
    def add_pipe(self, pipe):
 
1010
        # Call "handle_ipc" for both data and EOF events
 
1011
        gobject.io_add_watch(pipe, gobject.IO_IN | gobject.IO_HUP,
 
1012
                             self.handle_ipc)
 
1013
    def handle_ipc(self, source, condition, file_objects={}):
 
1014
        condition_names = {
 
1015
            gobject.IO_IN: u"IN",   # There is data to read.
 
1016
            gobject.IO_OUT: u"OUT", # Data can be written (without
 
1017
                                    # blocking).
 
1018
            gobject.IO_PRI: u"PRI", # There is urgent data to read.
 
1019
            gobject.IO_ERR: u"ERR", # Error condition.
 
1020
            gobject.IO_HUP: u"HUP"  # Hung up (the connection has been
 
1021
                                    # broken, usually for pipes and
 
1022
                                    # sockets).
 
1023
            }
 
1024
        conditions_string = ' | '.join(name
 
1025
                                       for cond, name in
 
1026
                                       condition_names.iteritems()
 
1027
                                       if cond & condition)
 
1028
        logger.debug(u"Handling IPC: FD = %d, condition = %s", source,
 
1029
                     conditions_string)
 
1030
        
 
1031
        # Turn the pipe file descriptor into a Python file object
 
1032
        if source not in file_objects:
 
1033
            file_objects[source] = os.fdopen(source, u"r", 1)
 
1034
        
 
1035
        # Read a line from the file object
 
1036
        cmdline = file_objects[source].readline()
 
1037
        if not cmdline:             # Empty line means end of file
 
1038
            # close the IPC pipe
 
1039
            file_objects[source].close()
 
1040
            del file_objects[source]
 
1041
            
 
1042
            # Stop calling this function
 
1043
            return False
 
1044
        
 
1045
        logger.debug(u"IPC command: %r", cmdline)
 
1046
        
 
1047
        # Parse and act on command
 
1048
        cmd, args = cmdline.rstrip(u"\r\n").split(None, 1)
 
1049
        
 
1050
        if cmd == u"NOTFOUND":
 
1051
            logger.warning(u"Client not found for fingerprint: %s",
 
1052
                           args)
 
1053
            if self.use_dbus:
 
1054
                # Emit D-Bus signal
 
1055
                mandos_dbus_service.ClientNotFound(args)
 
1056
        elif cmd == u"INVALID":
 
1057
            for client in self.clients:
 
1058
                if client.name == args:
 
1059
                    logger.warning(u"Client %s is invalid", args)
 
1060
                    if self.use_dbus:
 
1061
                        # Emit D-Bus signal
 
1062
                        client.Rejected()
 
1063
                    break
 
1064
            else:
 
1065
                logger.error(u"Unknown client %s is invalid", args)
 
1066
        elif cmd == u"SENDING":
 
1067
            for client in self.clients:
 
1068
                if client.name == args:
 
1069
                    logger.info(u"Sending secret to %s", client.name)
 
1070
                    client.checked_ok()
 
1071
                    if self.use_dbus:
 
1072
                        # Emit D-Bus signal
 
1073
                        client.ReceivedSecret()
 
1074
                    break
 
1075
            else:
 
1076
                logger.error(u"Sending secret to unknown client %s",
 
1077
                             args)
 
1078
        else:
 
1079
            logger.error(u"Unknown IPC command: %r", cmdline)
 
1080
        
 
1081
        # Keep calling this function
 
1082
        return True
409
1083
 
410
1084
 
411
1085
def string_to_delta(interval):
412
1086
    """Parse a string and return a datetime.timedelta
413
 
 
414
 
    >>> string_to_delta('7d')
 
1087
    
 
1088
    >>> string_to_delta(u'7d')
415
1089
    datetime.timedelta(7)
416
 
    >>> string_to_delta('60s')
 
1090
    >>> string_to_delta(u'60s')
417
1091
    datetime.timedelta(0, 60)
418
 
    >>> string_to_delta('60m')
 
1092
    >>> string_to_delta(u'60m')
419
1093
    datetime.timedelta(0, 3600)
420
 
    >>> string_to_delta('24h')
 
1094
    >>> string_to_delta(u'24h')
421
1095
    datetime.timedelta(1)
422
1096
    >>> string_to_delta(u'1w')
423
1097
    datetime.timedelta(7)
 
1098
    >>> string_to_delta(u'5m 30s')
 
1099
    datetime.timedelta(0, 330)
424
1100
    """
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:
 
1101
    timevalue = datetime.timedelta(0)
 
1102
    for s in interval.split():
 
1103
        try:
 
1104
            suffix = unicode(s[-1])
 
1105
            value = int(s[:-1])
 
1106
            if suffix == u"d":
 
1107
                delta = datetime.timedelta(value)
 
1108
            elif suffix == u"s":
 
1109
                delta = datetime.timedelta(0, value)
 
1110
            elif suffix == u"m":
 
1111
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
1112
            elif suffix == u"h":
 
1113
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
1114
            elif suffix == u"w":
 
1115
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
1116
            else:
 
1117
                raise ValueError
 
1118
        except (ValueError, IndexError):
439
1119
            raise ValueError
440
 
    except (ValueError, IndexError):
441
 
        raise ValueError
442
 
    return delta
443
 
 
444
 
 
445
 
def add_service():
446
 
    """From the Avahi server example code"""
447
 
    global group, serviceName, serviceType, servicePort, serviceTXT, \
448
 
           domain, host
449
 
    if group is None:
450
 
        group = dbus.Interface(
451
 
                bus.get_object( avahi.DBUS_NAME,
452
 
                                server.EntryGroupNew()),
453
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
454
 
        group.connect_to_signal('StateChanged',
455
 
                                entry_group_state_changed)
456
 
    logger.debug(u"Adding service '%s' of type '%s' ...",
457
 
                 serviceName, serviceType)
458
 
    
459
 
    group.AddService(
460
 
            serviceInterface,           # interface
461
 
            avahi.PROTO_INET6,          # protocol
462
 
            dbus.UInt32(0),             # flags
463
 
            serviceName, serviceType,
464
 
            domain, host,
465
 
            dbus.UInt16(servicePort),
466
 
            avahi.string_array_to_txt_array(serviceTXT))
467
 
    group.Commit()
468
 
 
469
 
 
470
 
def remove_service():
471
 
    """From the Avahi server example code"""
472
 
    global group
473
 
    
474
 
    if not group is None:
475
 
        group.Reset()
476
 
 
477
 
 
478
 
def server_state_changed(state):
479
 
    """From the Avahi server example code"""
480
 
    if state == avahi.SERVER_COLLISION:
481
 
        logger.warning(u"Server name collision")
482
 
        remove_service()
483
 
    elif state == avahi.SERVER_RUNNING:
484
 
        add_service()
485
 
 
486
 
 
487
 
def entry_group_state_changed(state, error):
488
 
    """From the Avahi server example code"""
489
 
    global serviceName, server, rename_count
490
 
    
491
 
    logger.debug(u"state change: %i", state)
492
 
    
493
 
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
494
 
        logger.debug(u"Service established.")
495
 
    elif state == avahi.ENTRY_GROUP_COLLISION:
496
 
        
497
 
        rename_count = rename_count - 1
498
 
        if rename_count > 0:
499
 
            name = server.GetAlternativeServiceName(name)
500
 
            logger.warning(u"Service name collision, "
501
 
                           u"changing name to '%s' ...", name)
502
 
            remove_service()
503
 
            add_service()
504
 
            
505
 
        else:
506
 
            logger.error(u"No suitable service name found "
507
 
                         u"after %i retries, exiting.",
508
 
                         n_rename)
509
 
            main_loop.quit()
510
 
    elif state == avahi.ENTRY_GROUP_FAILURE:
511
 
        logger.error(u"Error in group state changed %s",
512
 
                     unicode(error))
513
 
        main_loop.quit()
514
 
        return
 
1120
        timevalue += delta
 
1121
    return timevalue
515
1122
 
516
1123
 
517
1124
def if_nametoindex(interface):
518
 
    """Call the C function if_nametoindex()"""
 
1125
    """Call the C function if_nametoindex(), or equivalent
 
1126
    
 
1127
    Note: This function cannot accept a unicode string."""
 
1128
    global if_nametoindex
519
1129
    try:
520
 
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
521
 
        return libc.if_nametoindex(interface)
 
1130
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
1131
                          (ctypes.util.find_library(u"c"))
 
1132
                          .if_nametoindex)
522
1133
    except (OSError, AttributeError):
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()
 
1134
        logger.warning(u"Doing if_nametoindex the hard way")
 
1135
        def if_nametoindex(interface):
 
1136
            "Get an interface index the hard way, i.e. using fcntl()"
 
1137
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
1138
            with closing(socket.socket()) as s:
 
1139
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
1140
                                    struct.pack(str(u"16s16x"),
 
1141
                                                interface))
 
1142
            interface_index = struct.unpack(str(u"I"),
 
1143
                                            ifreq[16:20])[0]
 
1144
            return interface_index
 
1145
    return if_nametoindex(interface)
 
1146
 
 
1147
 
 
1148
def daemon(nochdir = False, noclose = False):
 
1149
    """See daemon(3).  Standard BSD Unix function.
 
1150
    
 
1151
    This should really exist as os.daemon, but it doesn't (yet)."""
 
1152
    if os.fork():
 
1153
        sys.exit()
 
1154
    os.setsid()
 
1155
    if not nochdir:
 
1156
        os.chdir(u"/")
 
1157
    if os.fork():
 
1158
        sys.exit()
 
1159
    if not noclose:
 
1160
        # Close all standard open file descriptors
 
1161
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1162
        if not stat.S_ISCHR(os.fstat(null).st_mode):
 
1163
            raise OSError(errno.ENODEV,
 
1164
                          u"/dev/null not a character device")
 
1165
        os.dup2(null, sys.stdin.fileno())
 
1166
        os.dup2(null, sys.stdout.fileno())
 
1167
        os.dup2(null, sys.stderr.fileno())
 
1168
        if null > 2:
 
1169
            os.close(null)
 
1170
 
 
1171
 
 
1172
def main():
 
1173
    
 
1174
    ######################################################################
 
1175
    # Parsing of options, both command line and config file
 
1176
    
 
1177
    parser = optparse.OptionParser(version = "%%prog %s" % version)
 
1178
    parser.add_option("-i", u"--interface", type=u"string",
 
1179
                      metavar="IF", help=u"Bind to interface IF")
 
1180
    parser.add_option("-a", u"--address", type=u"string",
 
1181
                      help=u"Address to listen for requests on")
 
1182
    parser.add_option("-p", u"--port", type=u"int",
 
1183
                      help=u"Port number to receive requests on")
 
1184
    parser.add_option("--check", action=u"store_true",
 
1185
                      help=u"Run self-test")
 
1186
    parser.add_option("--debug", action=u"store_true",
 
1187
                      help=u"Debug mode; run in foreground and log to"
 
1188
                      u" terminal")
 
1189
    parser.add_option("--priority", type=u"string", help=u"GnuTLS"
 
1190
                      u" priority string (see GnuTLS documentation)")
 
1191
    parser.add_option("--servicename", type=u"string",
 
1192
                      metavar=u"NAME", help=u"Zeroconf service name")
 
1193
    parser.add_option("--configdir", type=u"string",
 
1194
                      default=u"/etc/mandos", metavar=u"DIR",
 
1195
                      help=u"Directory to search for configuration"
 
1196
                      u" files")
 
1197
    parser.add_option("--no-dbus", action=u"store_false",
 
1198
                      dest=u"use_dbus", help=u"Do not provide D-Bus"
 
1199
                      u" system bus interface")
 
1200
    parser.add_option("--no-ipv6", action=u"store_false",
 
1201
                      dest=u"use_ipv6", help=u"Do not use IPv6")
 
1202
    options = parser.parse_args()[0]
566
1203
    
567
1204
    if options.check:
568
1205
        import doctest
569
1206
        doctest.testmod()
570
1207
        sys.exit()
571
1208
    
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
 
1209
    # Default values for config file for server-global settings
 
1210
    server_defaults = { u"interface": u"",
 
1211
                        u"address": u"",
 
1212
                        u"port": u"",
 
1213
                        u"debug": u"False",
 
1214
                        u"priority":
 
1215
                        u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
1216
                        u"servicename": u"Mandos",
 
1217
                        u"use_dbus": u"True",
 
1218
                        u"use_ipv6": u"True",
 
1219
                        }
 
1220
    
 
1221
    # Parse config file for server-global settings
 
1222
    server_config = configparser.SafeConfigParser(server_defaults)
 
1223
    del server_defaults
 
1224
    server_config.read(os.path.join(options.configdir,
 
1225
                                    u"mandos.conf"))
 
1226
    # Convert the SafeConfigParser object to a dict
 
1227
    server_settings = server_config.defaults()
 
1228
    # Use the appropriate methods on the non-string config options
 
1229
    for option in (u"debug", u"use_dbus", u"use_ipv6"):
 
1230
        server_settings[option] = server_config.getboolean(u"DEFAULT",
 
1231
                                                           option)
 
1232
    if server_settings["port"]:
 
1233
        server_settings["port"] = server_config.getint(u"DEFAULT",
 
1234
                                                       u"port")
 
1235
    del server_config
 
1236
    
 
1237
    # Override the settings from the config file with command line
 
1238
    # options, if set.
 
1239
    for option in (u"interface", u"address", u"port", u"debug",
 
1240
                   u"priority", u"servicename", u"configdir",
 
1241
                   u"use_dbus", u"use_ipv6"):
 
1242
        value = getattr(options, option)
 
1243
        if value is not None:
 
1244
            server_settings[option] = value
 
1245
    del options
 
1246
    # Force all strings to be unicode
 
1247
    for option in server_settings.keys():
 
1248
        if type(server_settings[option]) is str:
 
1249
            server_settings[option] = unicode(server_settings[option])
 
1250
    # Now we have our good server settings in "server_settings"
 
1251
    
 
1252
    ##################################################################
 
1253
    
 
1254
    # For convenience
 
1255
    debug = server_settings[u"debug"]
 
1256
    use_dbus = server_settings[u"use_dbus"]
 
1257
    use_ipv6 = server_settings[u"use_ipv6"]
 
1258
    
 
1259
    if not debug:
 
1260
        syslogger.setLevel(logging.WARNING)
 
1261
        console.setLevel(logging.WARNING)
 
1262
    
 
1263
    if server_settings[u"servicename"] != u"Mandos":
 
1264
        syslogger.setFormatter(logging.Formatter
 
1265
                               (u'Mandos (%s) [%%(process)d]:'
 
1266
                                u' %%(levelname)s: %%(message)s'
 
1267
                                % server_settings[u"servicename"]))
 
1268
    
 
1269
    # Parse config file with clients
 
1270
    client_defaults = { u"timeout": u"1h",
 
1271
                        u"interval": u"5m",
 
1272
                        u"checker": u"fping -q -- %%(host)s",
 
1273
                        u"host": u"",
 
1274
                        }
 
1275
    client_config = configparser.SafeConfigParser(client_defaults)
 
1276
    client_config.read(os.path.join(server_settings[u"configdir"],
 
1277
                                    u"clients.conf"))
 
1278
    
 
1279
    global mandos_dbus_service
 
1280
    mandos_dbus_service = None
 
1281
    
 
1282
    tcp_server = MandosServer((server_settings[u"address"],
 
1283
                               server_settings[u"port"]),
 
1284
                              ClientHandler,
 
1285
                              interface=server_settings[u"interface"],
 
1286
                              use_ipv6=use_ipv6,
 
1287
                              gnutls_priority=
 
1288
                              server_settings[u"priority"],
 
1289
                              use_dbus=use_dbus)
 
1290
    pidfilename = u"/var/run/mandos.pid"
 
1291
    try:
 
1292
        pidfile = open(pidfilename, u"w")
 
1293
    except IOError:
 
1294
        logger.error(u"Could not open file %r", pidfilename)
 
1295
    
 
1296
    try:
 
1297
        uid = pwd.getpwnam(u"_mandos").pw_uid
 
1298
        gid = pwd.getpwnam(u"_mandos").pw_gid
 
1299
    except KeyError:
 
1300
        try:
 
1301
            uid = pwd.getpwnam(u"mandos").pw_uid
 
1302
            gid = pwd.getpwnam(u"mandos").pw_gid
 
1303
        except KeyError:
 
1304
            try:
 
1305
                uid = pwd.getpwnam(u"nobody").pw_uid
 
1306
                gid = pwd.getpwnam(u"nobody").pw_gid
 
1307
            except KeyError:
 
1308
                uid = 65534
 
1309
                gid = 65534
 
1310
    try:
 
1311
        os.setgid(gid)
 
1312
        os.setuid(uid)
 
1313
    except OSError, error:
 
1314
        if error[0] != errno.EPERM:
 
1315
            raise error
 
1316
    
 
1317
    # Enable all possible GnuTLS debugging
 
1318
    if debug:
 
1319
        # "Use a log level over 10 to enable all debugging options."
 
1320
        # - GnuTLS manual
 
1321
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1322
        
 
1323
        @gnutls.library.types.gnutls_log_func
 
1324
        def debug_gnutls(level, string):
 
1325
            logger.debug(u"GnuTLS: %s", string[:-1])
 
1326
        
 
1327
        (gnutls.library.functions
 
1328
         .gnutls_global_set_log_function(debug_gnutls))
 
1329
    
 
1330
    global main_loop
 
1331
    # From the Avahi example code
589
1332
    DBusGMainLoop(set_as_default=True )
590
1333
    main_loop = gobject.MainLoop()
591
1334
    bus = dbus.SystemBus()
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:
 
1335
    # End of Avahi example code
 
1336
    if use_dbus:
 
1337
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
 
1338
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
1339
    service = AvahiService(name = server_settings[u"servicename"],
 
1340
                           servicetype = u"_mandos._tcp",
 
1341
                           protocol = protocol, bus = bus)
 
1342
    if server_settings["interface"]:
 
1343
        service.interface = (if_nametoindex
 
1344
                             (str(server_settings[u"interface"])))
 
1345
    
 
1346
    client_class = Client
 
1347
    if use_dbus:
 
1348
        client_class = functools.partial(ClientDBus, bus = bus)
 
1349
    tcp_server.clients.update(set(
 
1350
            client_class(name = section,
 
1351
                         config= dict(client_config.items(section)))
 
1352
            for section in client_config.sections()))
 
1353
    if not tcp_server.clients:
 
1354
        logger.warning(u"No clients defined")
 
1355
    
 
1356
    if debug:
 
1357
        # Redirect stdin so all checkers get /dev/null
 
1358
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1359
        os.dup2(null, sys.stdin.fileno())
 
1360
        if null > 2:
 
1361
            os.close(null)
 
1362
    else:
 
1363
        # No console logging
 
1364
        logger.removeHandler(console)
 
1365
        # Close all input and output, do double fork, etc.
 
1366
        daemon()
 
1367
    
 
1368
    try:
 
1369
        with closing(pidfile):
 
1370
            pid = os.getpid()
 
1371
            pidfile.write(str(pid) + "\n")
 
1372
        del pidfile
 
1373
    except IOError:
 
1374
        logger.error(u"Could not write to file %r with PID %d",
 
1375
                     pidfilename, pid)
 
1376
    except NameError:
 
1377
        # "pidfile" was never created
 
1378
        pass
 
1379
    del pidfilename
 
1380
    
 
1381
    def cleanup():
 
1382
        "Cleanup function; run on exit"
 
1383
        service.cleanup()
 
1384
        
 
1385
        while tcp_server.clients:
 
1386
            client = tcp_server.clients.pop()
 
1387
            client.disable_hook = None
 
1388
            client.disable()
 
1389
    
 
1390
    atexit.register(cleanup)
 
1391
    
 
1392
    if not debug:
 
1393
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
1394
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
1395
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
1396
    
 
1397
    if use_dbus:
 
1398
        class MandosDBusService(dbus.service.Object):
 
1399
            """A D-Bus proxy object"""
 
1400
            def __init__(self):
 
1401
                dbus.service.Object.__init__(self, bus, u"/")
 
1402
            _interface = u"se.bsnet.fukt.Mandos"
 
1403
            
 
1404
            @dbus.service.signal(_interface, signature=u"oa{sv}")
 
1405
            def ClientAdded(self, objpath, properties):
 
1406
                "D-Bus signal"
 
1407
                pass
 
1408
            
 
1409
            @dbus.service.signal(_interface, signature=u"s")
 
1410
            def ClientNotFound(self, fingerprint):
 
1411
                "D-Bus signal"
 
1412
                pass
 
1413
            
 
1414
            @dbus.service.signal(_interface, signature=u"os")
 
1415
            def ClientRemoved(self, objpath, name):
 
1416
                "D-Bus signal"
 
1417
                pass
 
1418
            
 
1419
            @dbus.service.method(_interface, out_signature=u"ao")
 
1420
            def GetAllClients(self):
 
1421
                "D-Bus method"
 
1422
                return dbus.Array(c.dbus_object_path
 
1423
                                  for c in tcp_server.clients)
 
1424
            
 
1425
            @dbus.service.method(_interface,
 
1426
                                 out_signature=u"a{oa{sv}}")
 
1427
            def GetAllClientsWithProperties(self):
 
1428
                "D-Bus method"
 
1429
                return dbus.Dictionary(
 
1430
                    ((c.dbus_object_path, c.GetAllProperties())
 
1431
                     for c in tcp_server.clients),
 
1432
                    signature=u"oa{sv}")
 
1433
            
 
1434
            @dbus.service.method(_interface, in_signature=u"o")
 
1435
            def RemoveClient(self, object_path):
 
1436
                "D-Bus method"
 
1437
                for c in tcp_server.clients:
 
1438
                    if c.dbus_object_path == object_path:
 
1439
                        tcp_server.clients.remove(c)
 
1440
                        c.remove_from_connection()
 
1441
                        # Don't signal anything except ClientRemoved
 
1442
                        c.disable(signal=False)
 
1443
                        # Emit D-Bus signal
 
1444
                        self.ClientRemoved(object_path, c.name)
 
1445
                        return
 
1446
                raise KeyError
 
1447
            
 
1448
            del _interface
 
1449
        
 
1450
        mandos_dbus_service = MandosDBusService()
 
1451
    
 
1452
    for client in tcp_server.clients:
 
1453
        if use_dbus:
 
1454
            # Emit D-Bus signal
 
1455
            mandos_dbus_service.ClientAdded(client.dbus_object_path,
 
1456
                                            client.GetAllProperties())
 
1457
        client.enable()
 
1458
    
 
1459
    tcp_server.enable()
 
1460
    tcp_server.server_activate()
 
1461
    
 
1462
    # Find out what port we got
 
1463
    service.port = tcp_server.socket.getsockname()[1]
 
1464
    if use_ipv6:
 
1465
        logger.info(u"Now listening on address %r, port %d,"
 
1466
                    " flowinfo %d, scope_id %d"
 
1467
                    % tcp_server.socket.getsockname())
 
1468
    else:                       # IPv4
 
1469
        logger.info(u"Now listening on address %r, port %d"
 
1470
                    % tcp_server.socket.getsockname())
 
1471
    
 
1472
    #service.interface = tcp_server.socket.getsockname()[3]
 
1473
    
 
1474
    try:
 
1475
        # From the Avahi example code
 
1476
        try:
 
1477
            service.activate()
 
1478
        except dbus.exceptions.DBusException, error:
 
1479
            logger.critical(u"DBusException: %s", error)
 
1480
            sys.exit(1)
 
1481
        # End of Avahi example code
 
1482
        
 
1483
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
1484
                             lambda *args, **kwargs:
 
1485
                             (tcp_server.handle_request
 
1486
                              (*args[2:], **kwargs) or True))
 
1487
        
 
1488
        logger.debug(u"Starting main loop")
635
1489
        main_loop.run()
 
1490
    except AvahiError, error:
 
1491
        logger.critical(u"AvahiError: %s", error)
 
1492
        sys.exit(1)
636
1493
    except KeyboardInterrupt:
637
 
        print
638
 
    
639
 
    # Cleanup here
 
1494
        if debug:
 
1495
            print >> sys.stderr
 
1496
        logger.debug(u"Server received KeyboardInterrupt")
 
1497
    logger.debug(u"Server exiting")
640
1498
 
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()
 
1499
if __name__ == '__main__':
 
1500
    main()