/mandos/release

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  • Committer: Teddy Hogeborn
  • Date: 2008-07-29 03:35:39 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080729033539-08zecoj3jwlkpjhw
* server.conf: New file.

* mandos-clients.conf: Renamed to clients.conf.

* Makefile (FORTIFY): New.
  (CFLAGS): Include $(FORTIFY).

* plugins.d/mandosclient.c (main): New "if_index" variable.  Bug fix:
                                   check if interface exists.  New
                                   "--connect" option.

* server.py (serviceInterface): Removed; replaced by
                                "AvahiService.interface".  All users
                                changed.
  (AvahiError, AvahiServiceError, AvahiGroupError): New exception
                                                    classes.
  (AvahiService): New class.
  (serviceName): Removed; replaced by "AvahiService.name".  All users
                 changed.
  (serviceType): Removed; replaced by "AvahiService.type".  All users
                 changed.
  (servicePort): Removed; replaced by "AvahiService.port".  All users
                 changed.
  (serviceTXT): Removed; replaced by "AvahiService.TXT".  All users
                changed.
  (domain): Removed; replaced by "AvahiService.domain".  All users
            changed.
  (host): Removed; replaced by "AvahiService.host".  All users
          changed.
  (rename_count): Removed; replaced by "AvahiService.rename_count" and
                 "AvahiService.max_renames".  All users changed.
  (Client.__init__): If no secret or secfile, raise TypeError instead
                     of RuntimeError.
  (Client.last_seen): Renamed to "Client.last_checked_ok".  All users
                      changed.
  (Client.stop, Client.stop_checker): Use "getattr" with default value
                                      instead of "hasattr".
  (Client.still_valid): Removed "now" argument.
  (Client.handle): Separate the "no client found" and "client invalid"
                   cases for clearer code.
  (IPv6_TCPServer.__init__): "options" argument replaced by
                             "settings".  All callers changed.
  (IPv6_TCPServer.options): Replaced by "IPv6_TCPServer.settings".
                            All users changed.
  (IPv6_TCPServer.server_bind): Use getattr instead of hasattr.
  (add_service): Removed; replaced by "AvahiService.add".  All callers
                 changed.
  (remove_service): Removed; replaced by "AvahiService.remove".  All
                    callers changed.
  (entry_group_state_changed): On entry group collision, call the new
                               AvahiService.rename method.  Raise
                               AvahiGroupError on group error.
  (if_nametoindex): Use ctypes.utils.find_library to locate the C
                    library.  Cache the result.  Loop on EINTR.
  (daemon): Use os.path.devnull to locate "/dev/null".
  (killme): Removed.  All callers changed to do "sys.exit()" instead,
            except where stated otherwise.
  (main): Removed "exitstatus".  Removed all default values from all
          non-bool options.  New option "--configdir".  New variables
          "server_defaults" and "server_settings", read from
          "%(configdir)s/server.conf".  Let any supplied command line
          options override server settings.   Variable "defaults"
          renamed to "client_defaults", which is read from
          "clients.conf" instead of "mandos-clients.conf".  New global
          AvahiService object "service" replaces old global variables.
          Catch AvahiError and exit with error if caught.

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Lines of Context:
server.py
6
6
# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
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".
 
9
# following functions: "AvahiService.add", "AvahiService.remove",
 
10
# "server_state_changed", "entry_group_state_changed", and some lines
 
11
# in "main".
12
12
# 
13
13
# Everything else is
14
 
# Copyright © 2008,2009 Teddy Hogeborn
15
 
# Copyright © 2008,2009 Björn Påhlsson
 
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
16
15
# 
17
16
# This program is free software: you can redistribute it and/or modify
18
17
# it under the terms of the GNU General Public License as published by
25
24
#     GNU General Public License for more details.
26
25
# 
27
26
# 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/>.
 
27
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
30
28
# 
31
29
# Contact the authors at <mandos@fukt.bsnet.se>.
32
30
# 
33
31
 
34
 
from __future__ import division, with_statement, absolute_import
 
32
from __future__ import division
35
33
 
36
 
import SocketServer as socketserver
 
34
import SocketServer
37
35
import socket
38
 
import optparse
 
36
import select
 
37
from optparse import OptionParser
39
38
import datetime
40
39
import errno
41
40
import gnutls.crypto
44
43
import gnutls.library.functions
45
44
import gnutls.library.constants
46
45
import gnutls.library.types
47
 
import ConfigParser as configparser
 
46
import ConfigParser
48
47
import sys
49
48
import re
50
49
import os
51
50
import signal
 
51
from sets import Set
52
52
import subprocess
53
53
import atexit
54
54
import stat
55
55
import logging
56
56
import logging.handlers
57
 
import pwd
58
 
from contextlib import closing
59
 
import struct
60
 
import fcntl
61
 
import functools
62
57
 
63
58
import dbus
64
 
import dbus.service
65
59
import gobject
66
60
import avahi
67
61
from dbus.mainloop.glib import DBusGMainLoop
68
62
import ctypes
69
 
import ctypes.util
70
 
 
71
 
try:
72
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
73
 
except AttributeError:
74
 
    try:
75
 
        from IN import SO_BINDTODEVICE
76
 
    except ImportError:
77
 
        SO_BINDTODEVICE = None
78
 
 
79
 
 
80
 
version = "1.0.12"
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'))
 
63
 
 
64
# Brief description of the operation of this program:
 
65
# 
 
66
# This server announces itself as a Zeroconf service.  Connecting
 
67
# clients use the TLS protocol, with the unusual quirk that this
 
68
# server program acts as a TLS "client" while a connecting client acts
 
69
# as a TLS "server".  The client (acting as a TLS "server") must
 
70
# supply an OpenPGP certificate, and the fingerprint of this
 
71
# certificate is used by this server to look up (in a list read from a
 
72
# file at start time) which binary blob to give the client.  No other
 
73
# authentication or authorization is done by this server.
 
74
 
 
75
 
 
76
logger = logging.Logger('mandos')
 
77
syslogger = logging.handlers.SysLogHandler\
 
78
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
 
79
syslogger.setFormatter(logging.Formatter\
 
80
                        ('%(levelname)s: %(message)s'))
89
81
logger.addHandler(syslogger)
 
82
del syslogger
90
83
 
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
84
 
97
85
class AvahiError(Exception):
98
 
    def __init__(self, value, *args, **kwargs):
 
86
    def __init__(self, value):
99
87
        self.value = value
100
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
101
 
    def __unicode__(self):
102
 
        return unicode(repr(self.value))
 
88
    def __str__(self):
 
89
        return repr(self.value)
103
90
 
104
91
class AvahiServiceError(AvahiError):
105
92
    pass
109
96
 
110
97
 
111
98
class AvahiService(object):
112
 
    """An Avahi (Zeroconf) service.
113
 
    
114
 
    Attributes:
 
99
    """
115
100
    interface: integer; avahi.IF_UNSPEC or an interface index.
116
101
               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()
 
102
    name = string; Example: "Mandos"
 
103
    type = string; Example: "_mandos._tcp".
 
104
                   See <http://www.dns-sd.org/ServiceTypes.html>
 
105
    port = integer; what port to announce
 
106
    TXT = list of strings; TXT record for the service
 
107
    domain = string; Domain to publish on, default to .local if empty.
 
108
    host = string; Host to publish records for, default to localhost
 
109
                   if empty.
 
110
    max_renames = integer; maximum number of renames
 
111
    rename_count = integer; counter so we only rename after collisions
 
112
                   a sensible number of times
130
113
    """
131
114
    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):
 
115
                 type = None, port = None, TXT = None, domain = "",
 
116
                 host = "", max_renames = 12):
 
117
        """An Avahi (Zeroconf) service. """
135
118
        self.interface = interface
136
119
        self.name = name
137
 
        self.type = servicetype
 
120
        self.type = type
138
121
        self.port = port
139
 
        self.TXT = TXT if TXT is not None else []
 
122
        if TXT is None:
 
123
            self.TXT = []
 
124
        else:
 
125
            self.TXT = TXT
140
126
        self.domain = domain
141
127
        self.host = host
142
128
        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
129
    def rename(self):
149
130
        """Derived from the Avahi example code"""
150
131
        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))
 
132
            logger.critical(u"No suitable service name found after %i"
 
133
                            u" retries, exiting.", rename_count)
 
134
            raise AvahiServiceError("Too many renames")
 
135
        name = server.GetAlternativeServiceName(name)
 
136
        logger.notice(u"Changing name to %r ...", name)
162
137
        self.remove()
163
138
        self.add()
164
139
        self.rename_count += 1
165
140
    def remove(self):
166
141
        """Derived from the Avahi example code"""
167
 
        if self.group is not None:
168
 
            self.group.Reset()
 
142
        if group is not None:
 
143
            group.Reset()
169
144
    def add(self):
170
145
        """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
178
 
                                         .entry_group_state_changed)
179
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
180
 
                     self.name, self.type)
181
 
        self.group.AddService(
182
 
            self.interface,
183
 
            self.protocol,
184
 
            dbus.UInt32(0),     # flags
185
 
            self.name, self.type,
186
 
            self.domain, self.host,
187
 
            dbus.UInt16(self.port),
188
 
            avahi.string_array_to_txt_array(self.TXT))
189
 
        self.group.Commit()
190
 
    def entry_group_state_changed(self, state, error):
191
 
        """Derived from the Avahi example code"""
192
 
        logger.debug(u"Avahi state change: %i", state)
193
 
        
194
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
195
 
            logger.debug(u"Zeroconf service established.")
196
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
197
 
            logger.warning(u"Zeroconf service name collision.")
198
 
            self.rename()
199
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
200
 
            logger.critical(u"Avahi: Error in group state changed %s",
201
 
                            unicode(error))
202
 
            raise AvahiGroupError(u"State changed: %s"
203
 
                                  % unicode(error))
204
 
    def cleanup(self):
205
 
        """Derived from the Avahi example code"""
206
 
        if self.group is not None:
207
 
            self.group.Free()
208
 
            self.group = None
209
 
    def server_state_changed(self, state):
210
 
        """Derived from the Avahi example code"""
211
 
        if state == avahi.SERVER_COLLISION:
212
 
            logger.error(u"Zeroconf server name collision")
213
 
            self.remove()
214
 
        elif state == avahi.SERVER_RUNNING:
215
 
            self.add()
216
 
    def activate(self):
217
 
        """Derived from the Avahi example code"""
218
 
        if self.server is None:
219
 
            self.server = dbus.Interface(
220
 
                self.bus.get_object(avahi.DBUS_NAME,
221
 
                                    avahi.DBUS_PATH_SERVER),
222
 
                avahi.DBUS_INTERFACE_SERVER)
223
 
        self.server.connect_to_signal(u"StateChanged",
224
 
                                 self.server_state_changed)
225
 
        self.server_state_changed(self.server.GetState())
 
146
        global group
 
147
        if group is None:
 
148
            group = dbus.Interface\
 
149
                    (bus.get_object(avahi.DBUS_NAME,
 
150
                                    server.EntryGroupNew()),
 
151
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
152
            group.connect_to_signal('StateChanged',
 
153
                                    entry_group_state_changed)
 
154
        logger.debug(u"Adding service '%s' of type '%s' ...",
 
155
                     service.name, service.type)
 
156
        group.AddService(
 
157
                self.interface,         # interface
 
158
                avahi.PROTO_INET6,      # protocol
 
159
                dbus.UInt32(0),         # flags
 
160
                self.name, self.type,
 
161
                self.domain, self.host,
 
162
                dbus.UInt16(self.port),
 
163
                avahi.string_array_to_txt_array(self.TXT))
 
164
        group.Commit()
 
165
 
 
166
# From the Avahi example code:
 
167
group = None                            # our entry group
 
168
# End of Avahi example code
226
169
 
227
170
 
228
171
class Client(object):
229
172
    """A representation of a client host served by this server.
230
 
    
231
173
    Attributes:
232
 
    name:       string; from the config file, used in log messages and
233
 
                        D-Bus identifiers
 
174
    name:      string; from the config file, used in log messages
234
175
    fingerprint: string (40 or 32 hexadecimal digits); used to
235
176
                 uniquely identify the client
236
 
    secret:     bytestring; sent verbatim (over TLS) to client
237
 
    host:       string; available for use by the checker command
238
 
    created:    datetime.datetime(); (UTC) object creation
239
 
    last_enabled: datetime.datetime(); (UTC)
240
 
    enabled:    bool()
241
 
    last_checked_ok: datetime.datetime(); (UTC) or None
242
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
243
 
                                      until this client is invalid
244
 
    interval:   datetime.timedelta(); How often to start a new checker
245
 
    disable_hook:  If set, called by disable() as disable_hook(self)
246
 
    checker:    subprocess.Popen(); a running checker process used
247
 
                                    to see if the client lives.
248
 
                                    'None' if no process is running.
 
177
    secret:    bytestring; sent verbatim (over TLS) to client
 
178
    fqdn:      string (FQDN); available for use by the checker command
 
179
    created:   datetime.datetime(); object creation, not client host
 
180
    last_checked_ok: datetime.datetime() or None if not yet checked OK
 
181
    timeout:   datetime.timedelta(); How long from last_checked_ok
 
182
                                     until this client is invalid
 
183
    interval:  datetime.timedelta(); How often to start a new checker
 
184
    stop_hook: If set, called by stop() as stop_hook(self)
 
185
    checker:   subprocess.Popen(); a running checker process used
 
186
                                   to see if the client lives.
 
187
                                   'None' if no process is running.
249
188
    checker_initiator_tag: a gobject event source tag, or None
250
 
    disable_initiator_tag:    - '' -
 
189
    stop_initiator_tag:    - '' -
251
190
    checker_callback_tag:  - '' -
252
191
    checker_command: string; External command which is run to check if
253
192
                     client lives.  %() expansions are done at
254
193
                     runtime with vars(self) as dict, so that for
255
194
                     instance %(name)s can be used in the command.
256
 
    current_checker_command: string; current running checker_command
 
195
    Private attibutes:
 
196
    _timeout: Real variable for 'timeout'
 
197
    _interval: Real variable for 'interval'
 
198
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
199
    _interval_milliseconds: - '' -
257
200
    """
258
 
    
259
 
    @staticmethod
260
 
    def _datetime_to_milliseconds(dt):
261
 
        "Convert a datetime.datetime() to milliseconds"
262
 
        return ((dt.days * 24 * 60 * 60 * 1000)
263
 
                + (dt.seconds * 1000)
264
 
                + (dt.microseconds // 1000))
265
 
    
266
 
    def timeout_milliseconds(self):
267
 
        "Return the 'timeout' attribute in milliseconds"
268
 
        return self._datetime_to_milliseconds(self.timeout)
269
 
    
270
 
    def interval_milliseconds(self):
271
 
        "Return the 'interval' attribute in milliseconds"
272
 
        return self._datetime_to_milliseconds(self.interval)
273
 
    
274
 
    def __init__(self, name = None, disable_hook=None, config=None):
275
 
        """Note: the 'checker' key in 'config' sets the
276
 
        'checker_command' attribute and *not* the 'checker'
277
 
        attribute."""
 
201
    def _set_timeout(self, timeout):
 
202
        "Setter function for 'timeout' attribute"
 
203
        self._timeout = timeout
 
204
        self._timeout_milliseconds = ((self.timeout.days
 
205
                                       * 24 * 60 * 60 * 1000)
 
206
                                      + (self.timeout.seconds * 1000)
 
207
                                      + (self.timeout.microseconds
 
208
                                         // 1000))
 
209
    timeout = property(lambda self: self._timeout,
 
210
                       _set_timeout)
 
211
    del _set_timeout
 
212
    def _set_interval(self, interval):
 
213
        "Setter function for 'interval' attribute"
 
214
        self._interval = interval
 
215
        self._interval_milliseconds = ((self.interval.days
 
216
                                        * 24 * 60 * 60 * 1000)
 
217
                                       + (self.interval.seconds
 
218
                                          * 1000)
 
219
                                       + (self.interval.microseconds
 
220
                                          // 1000))
 
221
    interval = property(lambda self: self._interval,
 
222
                        _set_interval)
 
223
    del _set_interval
 
224
    def __init__(self, name=None, stop_hook=None, fingerprint=None,
 
225
                 secret=None, secfile=None, fqdn=None, timeout=None,
 
226
                 interval=-1, checker=None):
 
227
        """Note: the 'checker' argument sets the 'checker_command'
 
228
        attribute and not the 'checker' attribute.."""
278
229
        self.name = name
279
 
        if config is None:
280
 
            config = {}
281
230
        logger.debug(u"Creating client %r", self.name)
282
 
        # Uppercase and remove spaces from fingerprint for later
283
 
        # comparison purposes with return value from the fingerprint()
284
 
        # function
285
 
        self.fingerprint = (config[u"fingerprint"].upper()
286
 
                            .replace(u" ", u""))
 
231
        # Uppercase and remove spaces from fingerprint
 
232
        # for later comparison purposes with return value of
 
233
        # the fingerprint() function
 
234
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
287
235
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
288
 
        if u"secret" in config:
289
 
            self.secret = config[u"secret"].decode(u"base64")
290
 
        elif u"secfile" in config:
291
 
            with closing(open(os.path.expanduser
292
 
                              (os.path.expandvars
293
 
                               (config[u"secfile"])))) as secfile:
294
 
                self.secret = secfile.read()
 
236
        if secret:
 
237
            self.secret = secret.decode(u"base64")
 
238
        elif secfile:
 
239
            sf = open(secfile)
 
240
            self.secret = sf.read()
 
241
            sf.close()
295
242
        else:
296
243
            raise TypeError(u"No secret or secfile for client %s"
297
244
                            % self.name)
298
 
        self.host = config.get(u"host", u"")
299
 
        self.created = datetime.datetime.utcnow()
300
 
        self.enabled = False
301
 
        self.last_enabled = None
 
245
        self.fqdn = fqdn
 
246
        self.created = datetime.datetime.now()
302
247
        self.last_checked_ok = None
303
 
        self.timeout = string_to_delta(config[u"timeout"])
304
 
        self.interval = string_to_delta(config[u"interval"])
305
 
        self.disable_hook = disable_hook
 
248
        self.timeout = string_to_delta(timeout)
 
249
        self.interval = string_to_delta(interval)
 
250
        self.stop_hook = stop_hook
306
251
        self.checker = None
307
252
        self.checker_initiator_tag = None
308
 
        self.disable_initiator_tag = None
 
253
        self.stop_initiator_tag = None
309
254
        self.checker_callback_tag = None
310
 
        self.checker_command = config[u"checker"]
311
 
        self.current_checker_command = None
312
 
        self.last_connect = None
313
 
    
314
 
    def enable(self):
 
255
        self.check_command = checker
 
256
    def start(self):
315
257
        """Start this client's checker and timeout hooks"""
316
 
        if getattr(self, u"enabled", False):
317
 
            # Already enabled
318
 
            return
319
 
        self.last_enabled = datetime.datetime.utcnow()
320
258
        # Schedule a new checker to be started an 'interval' from now,
321
259
        # and every interval from then on.
322
 
        self.checker_initiator_tag = (gobject.timeout_add
323
 
                                      (self.interval_milliseconds(),
324
 
                                       self.start_checker))
 
260
        self.checker_initiator_tag = gobject.timeout_add\
 
261
                                     (self._interval_milliseconds,
 
262
                                      self.start_checker)
325
263
        # Also start a new checker *right now*.
326
264
        self.start_checker()
327
 
        # Schedule a disable() when 'timeout' has passed
328
 
        self.disable_initiator_tag = (gobject.timeout_add
329
 
                                   (self.timeout_milliseconds(),
330
 
                                    self.disable))
331
 
        self.enabled = True
332
 
    
333
 
    def disable(self):
334
 
        """Disable this client."""
335
 
        if not getattr(self, "enabled", False):
 
265
        # Schedule a stop() when 'timeout' has passed
 
266
        self.stop_initiator_tag = gobject.timeout_add\
 
267
                                  (self._timeout_milliseconds,
 
268
                                   self.stop)
 
269
    def stop(self):
 
270
        """Stop this client.
 
271
        The possibility that a client might be restarted is left open,
 
272
        but not currently used."""
 
273
        # If this client doesn't have a secret, it is already stopped.
 
274
        if self.secret:
 
275
            logger.debug(u"Stopping client %s", self.name)
 
276
            self.secret = None
 
277
        else:
336
278
            return False
337
 
        logger.info(u"Disabling client %s", self.name)
338
 
        if getattr(self, u"disable_initiator_tag", False):
339
 
            gobject.source_remove(self.disable_initiator_tag)
340
 
            self.disable_initiator_tag = None
341
 
        if getattr(self, u"checker_initiator_tag", False):
 
279
        if getattr(self, "stop_initiator_tag", False):
 
280
            gobject.source_remove(self.stop_initiator_tag)
 
281
            self.stop_initiator_tag = None
 
282
        if getattr(self, "checker_initiator_tag", False):
342
283
            gobject.source_remove(self.checker_initiator_tag)
343
284
            self.checker_initiator_tag = None
344
285
        self.stop_checker()
345
 
        if self.disable_hook:
346
 
            self.disable_hook(self)
347
 
        self.enabled = False
 
286
        if self.stop_hook:
 
287
            self.stop_hook(self)
348
288
        # Do not run this again if called by a gobject.timeout_add
349
289
        return False
350
 
    
351
290
    def __del__(self):
352
 
        self.disable_hook = None
353
 
        self.disable()
354
 
    
355
 
    def checker_callback(self, pid, condition, command):
 
291
        self.stop_hook = None
 
292
        self.stop()
 
293
    def checker_callback(self, pid, condition):
356
294
        """The checker has completed, so take appropriate actions."""
 
295
        now = datetime.datetime.now()
357
296
        self.checker_callback_tag = None
358
297
        self.checker = None
359
 
        if os.WIFEXITED(condition):
360
 
            exitstatus = os.WEXITSTATUS(condition)
361
 
            if exitstatus == 0:
362
 
                logger.info(u"Checker for %(name)s succeeded",
363
 
                            vars(self))
364
 
                self.checked_ok()
365
 
            else:
366
 
                logger.info(u"Checker for %(name)s failed",
367
 
                            vars(self))
368
 
        else:
 
298
        if os.WIFEXITED(condition) \
 
299
               and (os.WEXITSTATUS(condition) == 0):
 
300
            logger.debug(u"Checker for %(name)s succeeded",
 
301
                         vars(self))
 
302
            self.last_checked_ok = now
 
303
            gobject.source_remove(self.stop_initiator_tag)
 
304
            self.stop_initiator_tag = gobject.timeout_add\
 
305
                                      (self._timeout_milliseconds,
 
306
                                       self.stop)
 
307
        elif not os.WIFEXITED(condition):
369
308
            logger.warning(u"Checker for %(name)s crashed?",
370
309
                           vars(self))
371
 
    
372
 
    def checked_ok(self):
373
 
        """Bump up the timeout for this client.
374
 
        
375
 
        This should only be called when the client has been seen,
376
 
        alive and well.
377
 
        """
378
 
        self.last_checked_ok = datetime.datetime.utcnow()
379
 
        gobject.source_remove(self.disable_initiator_tag)
380
 
        self.disable_initiator_tag = (gobject.timeout_add
381
 
                                      (self.timeout_milliseconds(),
382
 
                                       self.disable))
383
 
    
 
310
        else:
 
311
            logger.debug(u"Checker for %(name)s failed",
 
312
                         vars(self))
384
313
    def start_checker(self):
385
314
        """Start a new checker subprocess if one is not running.
386
 
        
387
315
        If a checker already exists, leave it running and do
388
316
        nothing."""
389
317
        # The reason for not killing a running checker is that if we
394
322
        # checkers alone, the checker would have to take more time
395
323
        # than 'timeout' for the client to be declared invalid, which
396
324
        # is as it should be.
397
 
        
398
 
        # If a checker exists, make sure it is not a zombie
399
 
        if self.checker is not None:
400
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
401
 
            if pid:
402
 
                logger.warning(u"Checker was a zombie")
403
 
                gobject.source_remove(self.checker_callback_tag)
404
 
                self.checker_callback(pid, status,
405
 
                                      self.current_checker_command)
406
 
        # Start a new checker if needed
407
325
        if self.checker is None:
408
326
            try:
409
 
                # In case checker_command has exactly one % operator
410
 
                command = self.checker_command % self.host
 
327
                # In case check_command has exactly one % operator
 
328
                command = self.check_command % self.fqdn
411
329
            except TypeError:
412
330
                # Escape attributes for the shell
413
 
                escaped_attrs = dict((key,
414
 
                                      re.escape(unicode(str(val),
415
 
                                                        errors=
416
 
                                                        u'replace')))
 
331
                escaped_attrs = dict((key, re.escape(str(val)))
417
332
                                     for key, val in
418
333
                                     vars(self).iteritems())
419
334
                try:
420
 
                    command = self.checker_command % escaped_attrs
 
335
                    command = self.check_command % escaped_attrs
421
336
                except TypeError, error:
422
337
                    logger.error(u'Could not format string "%s":'
423
 
                                 u' %s', self.checker_command, error)
 
338
                                 u' %s', self.check_command, error)
424
339
                    return True # Try again later
425
 
            self.current_checker_command = command
426
340
            try:
427
 
                logger.info(u"Starting checker %r for %s",
428
 
                            command, self.name)
429
 
                # We don't need to redirect stdout and stderr, since
430
 
                # in normal mode, that is already done by daemon(),
431
 
                # and in debug mode we don't want to.  (Stdin is
432
 
                # always replaced by /dev/null.)
 
341
                logger.debug(u"Starting checker %r for %s",
 
342
                             command, self.name)
433
343
                self.checker = subprocess.Popen(command,
434
344
                                                close_fds=True,
435
 
                                                shell=True, cwd=u"/")
436
 
                self.checker_callback_tag = (gobject.child_watch_add
437
 
                                             (self.checker.pid,
438
 
                                              self.checker_callback,
439
 
                                              data=command))
440
 
                # The checker may have completed before the gobject
441
 
                # watch was added.  Check for this.
442
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
443
 
                if pid:
444
 
                    gobject.source_remove(self.checker_callback_tag)
445
 
                    self.checker_callback(pid, status, command)
446
 
            except OSError, error:
 
345
                                                shell=True, cwd="/")
 
346
                self.checker_callback_tag = gobject.child_watch_add\
 
347
                                            (self.checker.pid,
 
348
                                             self.checker_callback)
 
349
            except subprocess.OSError, error:
447
350
                logger.error(u"Failed to start subprocess: %s",
448
351
                             error)
449
352
        # Re-run this periodically if run by gobject.timeout_add
450
353
        return True
451
 
    
452
354
    def stop_checker(self):
453
355
        """Force the checker process, if any, to stop."""
454
356
        if self.checker_callback_tag:
455
357
            gobject.source_remove(self.checker_callback_tag)
456
358
            self.checker_callback_tag = None
457
 
        if getattr(self, u"checker", None) is None:
 
359
        if getattr(self, "checker", None) is None:
458
360
            return
459
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
361
        logger.debug("Stopping checker for %(name)s", vars(self))
460
362
        try:
461
363
            os.kill(self.checker.pid, signal.SIGTERM)
462
364
            #os.sleep(0.5)
466
368
            if error.errno != errno.ESRCH: # No such process
467
369
                raise
468
370
        self.checker = None
469
 
    
470
371
    def still_valid(self):
471
372
        """Has the timeout not yet passed for this client?"""
472
 
        if not getattr(self, u"enabled", False):
473
 
            return False
474
 
        now = datetime.datetime.utcnow()
 
373
        now = datetime.datetime.now()
475
374
        if self.last_checked_ok is None:
476
375
            return now < (self.created + self.timeout)
477
376
        else:
478
377
            return now < (self.last_checked_ok + self.timeout)
479
378
 
480
379
 
481
 
class ClientDBus(Client, dbus.service.Object):
482
 
    """A Client class using D-Bus
483
 
    
484
 
    Attributes:
485
 
    dbus_object_path: dbus.ObjectPath
486
 
    bus: dbus.SystemBus()
487
 
    """
488
 
    # dbus.service.Object doesn't use super(), so we can't either.
489
 
    
490
 
    def __init__(self, bus = None, *args, **kwargs):
491
 
        self.bus = bus
492
 
        Client.__init__(self, *args, **kwargs)
493
 
        # Only now, when this client is initialized, can it show up on
494
 
        # the D-Bus
495
 
        self.dbus_object_path = (dbus.ObjectPath
496
 
                                 (u"/clients/"
497
 
                                  + self.name.replace(u".", u"_")))
498
 
        dbus.service.Object.__init__(self, self.bus,
499
 
                                     self.dbus_object_path)
500
 
    
501
 
    @staticmethod
502
 
    def _datetime_to_dbus(dt, variant_level=0):
503
 
        """Convert a UTC datetime.datetime() to a D-Bus type."""
504
 
        return dbus.String(dt.isoformat(),
505
 
                           variant_level=variant_level)
506
 
    
507
 
    def enable(self):
508
 
        oldstate = getattr(self, u"enabled", False)
509
 
        r = Client.enable(self)
510
 
        if oldstate != self.enabled:
511
 
            # Emit D-Bus signals
512
 
            self.PropertyChanged(dbus.String(u"enabled"),
513
 
                                 dbus.Boolean(True, variant_level=1))
514
 
            self.PropertyChanged(
515
 
                dbus.String(u"last_enabled"),
516
 
                self._datetime_to_dbus(self.last_enabled,
517
 
                                       variant_level=1))
518
 
        return r
519
 
    
520
 
    def disable(self, signal = True):
521
 
        oldstate = getattr(self, u"enabled", False)
522
 
        r = Client.disable(self)
523
 
        if signal and oldstate != self.enabled:
524
 
            # Emit D-Bus signal
525
 
            self.PropertyChanged(dbus.String(u"enabled"),
526
 
                                 dbus.Boolean(False, variant_level=1))
527
 
        return r
528
 
    
529
 
    def __del__(self, *args, **kwargs):
530
 
        try:
531
 
            self.remove_from_connection()
532
 
        except LookupError:
533
 
            pass
534
 
        if hasattr(dbus.service.Object, u"__del__"):
535
 
            dbus.service.Object.__del__(self, *args, **kwargs)
536
 
        Client.__del__(self, *args, **kwargs)
537
 
    
538
 
    def checker_callback(self, pid, condition, command,
539
 
                         *args, **kwargs):
540
 
        self.checker_callback_tag = None
541
 
        self.checker = None
542
 
        # Emit D-Bus signal
543
 
        self.PropertyChanged(dbus.String(u"checker_running"),
544
 
                             dbus.Boolean(False, variant_level=1))
545
 
        if os.WIFEXITED(condition):
546
 
            exitstatus = os.WEXITSTATUS(condition)
547
 
            # Emit D-Bus signal
548
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
549
 
                                  dbus.Int64(condition),
550
 
                                  dbus.String(command))
551
 
        else:
552
 
            # Emit D-Bus signal
553
 
            self.CheckerCompleted(dbus.Int16(-1),
554
 
                                  dbus.Int64(condition),
555
 
                                  dbus.String(command))
556
 
        
557
 
        return Client.checker_callback(self, pid, condition, command,
558
 
                                       *args, **kwargs)
559
 
    
560
 
    def checked_ok(self, *args, **kwargs):
561
 
        r = Client.checked_ok(self, *args, **kwargs)
562
 
        # Emit D-Bus signal
563
 
        self.PropertyChanged(
564
 
            dbus.String(u"last_checked_ok"),
565
 
            (self._datetime_to_dbus(self.last_checked_ok,
566
 
                                    variant_level=1)))
567
 
        return r
568
 
    
569
 
    def start_checker(self, *args, **kwargs):
570
 
        old_checker = self.checker
571
 
        if self.checker is not None:
572
 
            old_checker_pid = self.checker.pid
573
 
        else:
574
 
            old_checker_pid = None
575
 
        r = Client.start_checker(self, *args, **kwargs)
576
 
        # Only if new checker process was started
577
 
        if (self.checker is not None
578
 
            and old_checker_pid != self.checker.pid):
579
 
            # Emit D-Bus signal
580
 
            self.CheckerStarted(self.current_checker_command)
581
 
            self.PropertyChanged(
582
 
                dbus.String(u"checker_running"),
583
 
                dbus.Boolean(True, variant_level=1))
584
 
        return r
585
 
    
586
 
    def stop_checker(self, *args, **kwargs):
587
 
        old_checker = getattr(self, u"checker", None)
588
 
        r = Client.stop_checker(self, *args, **kwargs)
589
 
        if (old_checker is not None
590
 
            and getattr(self, u"checker", None) is None):
591
 
            self.PropertyChanged(dbus.String(u"checker_running"),
592
 
                                 dbus.Boolean(False, variant_level=1))
593
 
        return r
594
 
    
595
 
    ## D-Bus methods & signals
596
 
    _interface = u"se.bsnet.fukt.Mandos.Client"
597
 
    
598
 
    # CheckedOK - method
599
 
    @dbus.service.method(_interface)
600
 
    def CheckedOK(self):
601
 
        return self.checked_ok()
602
 
    
603
 
    # CheckerCompleted - signal
604
 
    @dbus.service.signal(_interface, signature=u"nxs")
605
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
606
 
        "D-Bus signal"
607
 
        pass
608
 
    
609
 
    # CheckerStarted - signal
610
 
    @dbus.service.signal(_interface, signature=u"s")
611
 
    def CheckerStarted(self, command):
612
 
        "D-Bus signal"
613
 
        pass
614
 
    
615
 
    # GetAllProperties - method
616
 
    @dbus.service.method(_interface, out_signature=u"a{sv}")
617
 
    def GetAllProperties(self):
618
 
        "D-Bus method"
619
 
        return dbus.Dictionary({
620
 
                dbus.String(u"name"):
621
 
                    dbus.String(self.name, variant_level=1),
622
 
                dbus.String(u"fingerprint"):
623
 
                    dbus.String(self.fingerprint, variant_level=1),
624
 
                dbus.String(u"host"):
625
 
                    dbus.String(self.host, variant_level=1),
626
 
                dbus.String(u"created"):
627
 
                    self._datetime_to_dbus(self.created,
628
 
                                           variant_level=1),
629
 
                dbus.String(u"last_enabled"):
630
 
                    (self._datetime_to_dbus(self.last_enabled,
631
 
                                            variant_level=1)
632
 
                     if self.last_enabled is not None
633
 
                     else dbus.Boolean(False, variant_level=1)),
634
 
                dbus.String(u"enabled"):
635
 
                    dbus.Boolean(self.enabled, variant_level=1),
636
 
                dbus.String(u"last_checked_ok"):
637
 
                    (self._datetime_to_dbus(self.last_checked_ok,
638
 
                                            variant_level=1)
639
 
                     if self.last_checked_ok is not None
640
 
                     else dbus.Boolean (False, variant_level=1)),
641
 
                dbus.String(u"timeout"):
642
 
                    dbus.UInt64(self.timeout_milliseconds(),
643
 
                                variant_level=1),
644
 
                dbus.String(u"interval"):
645
 
                    dbus.UInt64(self.interval_milliseconds(),
646
 
                                variant_level=1),
647
 
                dbus.String(u"checker"):
648
 
                    dbus.String(self.checker_command,
649
 
                                variant_level=1),
650
 
                dbus.String(u"checker_running"):
651
 
                    dbus.Boolean(self.checker is not None,
652
 
                                 variant_level=1),
653
 
                dbus.String(u"object_path"):
654
 
                    dbus.ObjectPath(self.dbus_object_path,
655
 
                                    variant_level=1)
656
 
                }, signature=u"sv")
657
 
    
658
 
    # IsStillValid - method
659
 
    @dbus.service.method(_interface, out_signature=u"b")
660
 
    def IsStillValid(self):
661
 
        return self.still_valid()
662
 
    
663
 
    # PropertyChanged - signal
664
 
    @dbus.service.signal(_interface, signature=u"sv")
665
 
    def PropertyChanged(self, property, value):
666
 
        "D-Bus signal"
667
 
        pass
668
 
    
669
 
    # ReceivedSecret - signal
670
 
    @dbus.service.signal(_interface)
671
 
    def ReceivedSecret(self):
672
 
        "D-Bus signal"
673
 
        pass
674
 
    
675
 
    # Rejected - signal
676
 
    @dbus.service.signal(_interface)
677
 
    def Rejected(self):
678
 
        "D-Bus signal"
679
 
        pass
680
 
    
681
 
    # SetChecker - method
682
 
    @dbus.service.method(_interface, in_signature=u"s")
683
 
    def SetChecker(self, checker):
684
 
        "D-Bus setter method"
685
 
        self.checker_command = checker
686
 
        # Emit D-Bus signal
687
 
        self.PropertyChanged(dbus.String(u"checker"),
688
 
                             dbus.String(self.checker_command,
689
 
                                         variant_level=1))
690
 
    
691
 
    # SetHost - method
692
 
    @dbus.service.method(_interface, in_signature=u"s")
693
 
    def SetHost(self, host):
694
 
        "D-Bus setter method"
695
 
        self.host = host
696
 
        # Emit D-Bus signal
697
 
        self.PropertyChanged(dbus.String(u"host"),
698
 
                             dbus.String(self.host, variant_level=1))
699
 
    
700
 
    # SetInterval - method
701
 
    @dbus.service.method(_interface, in_signature=u"t")
702
 
    def SetInterval(self, milliseconds):
703
 
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
704
 
        # Emit D-Bus signal
705
 
        self.PropertyChanged(dbus.String(u"interval"),
706
 
                             (dbus.UInt64(self
707
 
                                          .interval_milliseconds(),
708
 
                                          variant_level=1)))
709
 
    
710
 
    # SetSecret - method
711
 
    @dbus.service.method(_interface, in_signature=u"ay",
712
 
                         byte_arrays=True)
713
 
    def SetSecret(self, secret):
714
 
        "D-Bus setter method"
715
 
        self.secret = str(secret)
716
 
    
717
 
    # SetTimeout - method
718
 
    @dbus.service.method(_interface, in_signature=u"t")
719
 
    def SetTimeout(self, milliseconds):
720
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
721
 
        # Emit D-Bus signal
722
 
        self.PropertyChanged(dbus.String(u"timeout"),
723
 
                             (dbus.UInt64(self.timeout_milliseconds(),
724
 
                                          variant_level=1)))
725
 
    
726
 
    # Enable - method
727
 
    @dbus.service.method(_interface)
728
 
    def Enable(self):
729
 
        "D-Bus method"
730
 
        self.enable()
731
 
    
732
 
    # StartChecker - method
733
 
    @dbus.service.method(_interface)
734
 
    def StartChecker(self):
735
 
        "D-Bus method"
736
 
        self.start_checker()
737
 
    
738
 
    # Disable - method
739
 
    @dbus.service.method(_interface)
740
 
    def Disable(self):
741
 
        "D-Bus method"
742
 
        self.disable()
743
 
    
744
 
    # StopChecker - method
745
 
    @dbus.service.method(_interface)
746
 
    def StopChecker(self):
747
 
        self.stop_checker()
748
 
    
749
 
    del _interface
750
 
 
751
 
 
752
 
class ClientHandler(socketserver.BaseRequestHandler, object):
753
 
    """A class to handle client connections.
754
 
    
755
 
    Instantiated once for each connection to handle it.
 
380
def peer_certificate(session):
 
381
    "Return the peer's OpenPGP certificate as a bytestring"
 
382
    # If not an OpenPGP certificate...
 
383
    if gnutls.library.functions.gnutls_certificate_type_get\
 
384
            (session._c_object) \
 
385
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
386
        # ...do the normal thing
 
387
        return session.peer_certificate
 
388
    list_size = ctypes.c_uint()
 
389
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
390
        (session._c_object, ctypes.byref(list_size))
 
391
    if list_size.value == 0:
 
392
        return None
 
393
    cert = cert_list[0]
 
394
    return ctypes.string_at(cert.data, cert.size)
 
395
 
 
396
 
 
397
def fingerprint(openpgp):
 
398
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
399
    # New empty GnuTLS certificate
 
400
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
401
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
402
        (ctypes.byref(crt))
 
403
    # New GnuTLS "datum" with the OpenPGP public key
 
404
    datum = gnutls.library.types.gnutls_datum_t\
 
405
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
406
                     ctypes.POINTER(ctypes.c_ubyte)),
 
407
         ctypes.c_uint(len(openpgp)))
 
408
    # Import the OpenPGP public key into the certificate
 
409
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
410
        (crt,
 
411
         ctypes.byref(datum),
 
412
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
413
    # New buffer for the fingerprint
 
414
    buffer = ctypes.create_string_buffer(20)
 
415
    buffer_length = ctypes.c_size_t()
 
416
    # Get the fingerprint from the certificate into the buffer
 
417
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
418
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
419
    # Deinit the certificate
 
420
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
421
    # Convert the buffer to a Python bytestring
 
422
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
423
    # Convert the bytestring to hexadecimal notation
 
424
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
425
    return hex_fpr
 
426
 
 
427
 
 
428
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
429
    """A TCP request handler class.
 
430
    Instantiated by IPv6_TCPServer for each request to handle it.
756
431
    Note: This will run in its own forked process."""
757
432
    
758
433
    def handle(self):
759
 
        logger.info(u"TCP connection from: %s",
760
 
                    unicode(self.client_address))
761
 
        logger.debug(u"IPC Pipe FD: %d", self.server.pipe[1])
762
 
        # Open IPC pipe to parent process
763
 
        with closing(os.fdopen(self.server.pipe[1], u"w", 1)) as ipc:
764
 
            session = (gnutls.connection
765
 
                       .ClientSession(self.request,
766
 
                                      gnutls.connection
767
 
                                      .X509Credentials()))
768
 
            
769
 
            line = self.request.makefile().readline()
770
 
            logger.debug(u"Protocol version: %r", line)
771
 
            try:
772
 
                if int(line.strip().split()[0]) > 1:
773
 
                    raise RuntimeError
774
 
            except (ValueError, IndexError, RuntimeError), error:
775
 
                logger.error(u"Unknown protocol version: %s", error)
776
 
                return
777
 
            
778
 
            # Note: gnutls.connection.X509Credentials is really a
779
 
            # generic GnuTLS certificate credentials object so long as
780
 
            # no X.509 keys are added to it.  Therefore, we can use it
781
 
            # here despite using OpenPGP certificates.
782
 
            
783
 
            #priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
784
 
            #                      u"+AES-256-CBC", u"+SHA1",
785
 
            #                      u"+COMP-NULL", u"+CTYPE-OPENPGP",
786
 
            #                      u"+DHE-DSS"))
787
 
            # Use a fallback default, since this MUST be set.
788
 
            priority = self.server.gnutls_priority
789
 
            if priority is None:
790
 
                priority = u"NORMAL"
791
 
            (gnutls.library.functions
792
 
             .gnutls_priority_set_direct(session._c_object,
793
 
                                         priority, None))
794
 
            
795
 
            try:
796
 
                session.handshake()
797
 
            except gnutls.errors.GNUTLSError, error:
798
 
                logger.warning(u"Handshake failed: %s", error)
799
 
                # Do not run session.bye() here: the session is not
800
 
                # established.  Just abandon the request.
801
 
                return
802
 
            logger.debug(u"Handshake succeeded")
803
 
            try:
804
 
                fpr = self.fingerprint(self.peer_certificate(session))
805
 
            except (TypeError, gnutls.errors.GNUTLSError), error:
806
 
                logger.warning(u"Bad certificate: %s", error)
807
 
                session.bye()
808
 
                return
809
 
            logger.debug(u"Fingerprint: %s", fpr)
810
 
            
811
 
            for c in self.server.clients:
812
 
                if c.fingerprint == fpr:
813
 
                    client = c
814
 
                    break
815
 
            else:
816
 
                ipc.write(u"NOTFOUND %s %s\n"
817
 
                          % (fpr, unicode(self.client_address)))
818
 
                session.bye()
819
 
                return
820
 
            # Have to check if client.still_valid(), since it is
821
 
            # possible that the client timed out while establishing
822
 
            # the GnuTLS session.
823
 
            if not client.still_valid():
824
 
                ipc.write(u"INVALID %s\n" % client.name)
825
 
                session.bye()
826
 
                return
827
 
            ipc.write(u"SENDING %s\n" % client.name)
828
 
            sent_size = 0
829
 
            while sent_size < len(client.secret):
830
 
                sent = session.send(client.secret[sent_size:])
831
 
                logger.debug(u"Sent: %d, remaining: %d",
832
 
                             sent, len(client.secret)
833
 
                             - (sent_size + sent))
834
 
                sent_size += sent
835
 
            session.bye()
836
 
    
837
 
    @staticmethod
838
 
    def peer_certificate(session):
839
 
        "Return the peer's OpenPGP certificate as a bytestring"
840
 
        # If not an OpenPGP certificate...
841
 
        if (gnutls.library.functions
842
 
            .gnutls_certificate_type_get(session._c_object)
843
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
844
 
            # ...do the normal thing
845
 
            return session.peer_certificate
846
 
        list_size = ctypes.c_uint(1)
847
 
        cert_list = (gnutls.library.functions
848
 
                     .gnutls_certificate_get_peers
849
 
                     (session._c_object, ctypes.byref(list_size)))
850
 
        if not bool(cert_list) and list_size.value != 0:
851
 
            raise gnutls.errors.GNUTLSError(u"error getting peer"
852
 
                                            u" certificate")
853
 
        if list_size.value == 0:
854
 
            return None
855
 
        cert = cert_list[0]
856
 
        return ctypes.string_at(cert.data, cert.size)
857
 
    
858
 
    @staticmethod
859
 
    def fingerprint(openpgp):
860
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
861
 
        # New GnuTLS "datum" with the OpenPGP public key
862
 
        datum = (gnutls.library.types
863
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
864
 
                                             ctypes.POINTER
865
 
                                             (ctypes.c_ubyte)),
866
 
                                 ctypes.c_uint(len(openpgp))))
867
 
        # New empty GnuTLS certificate
868
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
869
 
        (gnutls.library.functions
870
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
871
 
        # Import the OpenPGP public key into the certificate
872
 
        (gnutls.library.functions
873
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
874
 
                                    gnutls.library.constants
875
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
876
 
        # Verify the self signature in the key
877
 
        crtverify = ctypes.c_uint()
878
 
        (gnutls.library.functions
879
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
880
 
                                         ctypes.byref(crtverify)))
881
 
        if crtverify.value != 0:
882
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
883
 
            raise (gnutls.errors.CertificateSecurityError
884
 
                   (u"Verify failed"))
885
 
        # New buffer for the fingerprint
886
 
        buf = ctypes.create_string_buffer(20)
887
 
        buf_len = ctypes.c_size_t()
888
 
        # Get the fingerprint from the certificate into the buffer
889
 
        (gnutls.library.functions
890
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
891
 
                                             ctypes.byref(buf_len)))
892
 
        # Deinit the certificate
893
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
894
 
        # Convert the buffer to a Python bytestring
895
 
        fpr = ctypes.string_at(buf, buf_len.value)
896
 
        # Convert the bytestring to hexadecimal notation
897
 
        hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
898
 
        return hex_fpr
899
 
 
900
 
 
901
 
class ForkingMixInWithPipe(socketserver.ForkingMixIn, object):
902
 
    """Like socketserver.ForkingMixIn, but also pass a pipe."""
903
 
    def process_request(self, request, client_address):
904
 
        """Overrides and wraps the original process_request().
905
 
        
906
 
        This function creates a new pipe in self.pipe
907
 
        """
908
 
        self.pipe = os.pipe()
909
 
        super(ForkingMixInWithPipe,
910
 
              self).process_request(request, client_address)
911
 
        os.close(self.pipe[1])  # close write end
912
 
        self.add_pipe(self.pipe[0])
913
 
    def add_pipe(self, pipe):
914
 
        """Dummy function; override as necessary"""
915
 
        os.close(pipe)
916
 
 
917
 
 
918
 
class IPv6_TCPServer(ForkingMixInWithPipe,
919
 
                     socketserver.TCPServer, object):
920
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
921
 
    
 
434
        logger.debug(u"TCP connection from: %s",
 
435
                     unicode(self.client_address))
 
436
        session = gnutls.connection.ClientSession\
 
437
                  (self.request, gnutls.connection.X509Credentials())
 
438
        # Note: gnutls.connection.X509Credentials is really a generic
 
439
        # GnuTLS certificate credentials object so long as no X.509
 
440
        # keys are added to it.  Therefore, we can use it here despite
 
441
        # using OpenPGP certificates.
 
442
        
 
443
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
444
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
445
        #                "+DHE-DSS"))
 
446
        priority = "NORMAL"             # Fallback default, since this
 
447
                                        # MUST be set.
 
448
        if self.server.settings["priority"]:
 
449
            priority = self.server.settings["priority"]
 
450
        gnutls.library.functions.gnutls_priority_set_direct\
 
451
            (session._c_object, priority, None);
 
452
        
 
453
        try:
 
454
            session.handshake()
 
455
        except gnutls.errors.GNUTLSError, error:
 
456
            logger.debug(u"Handshake failed: %s", error)
 
457
            # Do not run session.bye() here: the session is not
 
458
            # established.  Just abandon the request.
 
459
            return
 
460
        try:
 
461
            fpr = fingerprint(peer_certificate(session))
 
462
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
463
            logger.debug(u"Bad certificate: %s", error)
 
464
            session.bye()
 
465
            return
 
466
        logger.debug(u"Fingerprint: %s", fpr)
 
467
        client = None
 
468
        for c in self.server.clients:
 
469
            if c.fingerprint == fpr:
 
470
                client = c
 
471
                break
 
472
        if not client:
 
473
            logger.debug(u"Client not found for fingerprint: %s", fpr)
 
474
            session.bye()
 
475
            return
 
476
        # Have to check if client.still_valid(), since it is possible
 
477
        # that the client timed out while establishing the GnuTLS
 
478
        # session.
 
479
        if not client.still_valid():
 
480
            logger.debug(u"Client %(name)s is invalid", vars(client))
 
481
            session.bye()
 
482
            return
 
483
        sent_size = 0
 
484
        while sent_size < len(client.secret):
 
485
            sent = session.send(client.secret[sent_size:])
 
486
            logger.debug(u"Sent: %d, remaining: %d",
 
487
                         sent, len(client.secret)
 
488
                         - (sent_size + sent))
 
489
            sent_size += sent
 
490
        session.bye()
 
491
 
 
492
 
 
493
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
494
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
922
495
    Attributes:
923
 
        enabled:        Boolean; whether this server is activated yet
924
 
        interface:      None or a network interface name (string)
925
 
        use_ipv6:       Boolean; to use IPv6 or not
 
496
        settings:       Server settings
 
497
        clients:        Set() of Client objects
926
498
    """
927
 
    def __init__(self, server_address, RequestHandlerClass,
928
 
                 interface=None, use_ipv6=True):
929
 
        self.interface = interface
930
 
        if use_ipv6:
931
 
            self.address_family = socket.AF_INET6
932
 
        socketserver.TCPServer.__init__(self, server_address,
933
 
                                        RequestHandlerClass)
 
499
    address_family = socket.AF_INET6
 
500
    def __init__(self, *args, **kwargs):
 
501
        if "settings" in kwargs:
 
502
            self.settings = kwargs["settings"]
 
503
            del kwargs["settings"]
 
504
        if "clients" in kwargs:
 
505
            self.clients = kwargs["clients"]
 
506
            del kwargs["clients"]
 
507
        return super(type(self), self).__init__(*args, **kwargs)
934
508
    def server_bind(self):
935
509
        """This overrides the normal server_bind() function
936
510
        to bind to an interface if one was specified, and also NOT to
937
511
        bind to an address or port if they were not specified."""
938
 
        if self.interface is not None:
939
 
            if SO_BINDTODEVICE is None:
940
 
                logger.error(u"SO_BINDTODEVICE does not exist;"
941
 
                             u" cannot bind to interface %s",
942
 
                             self.interface)
943
 
            else:
944
 
                try:
945
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
946
 
                                           SO_BINDTODEVICE,
947
 
                                           str(self.interface
948
 
                                               + u'\0'))
949
 
                except socket.error, error:
950
 
                    if error[0] == errno.EPERM:
951
 
                        logger.error(u"No permission to"
952
 
                                     u" bind to interface %s",
953
 
                                     self.interface)
954
 
                    elif error[0] == errno.ENOPROTOOPT:
955
 
                        logger.error(u"SO_BINDTODEVICE not available;"
956
 
                                     u" cannot bind to interface %s",
957
 
                                     self.interface)
958
 
                    else:
959
 
                        raise
 
512
        if self.settings["interface"] != avahi.IF_UNSPEC:
 
513
            # 25 is from /usr/include/asm-i486/socket.h
 
514
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
515
            try:
 
516
                self.socket.setsockopt(socket.SOL_SOCKET,
 
517
                                       SO_BINDTODEVICE,
 
518
                                       self.settings["interface"])
 
519
            except socket.error, error:
 
520
                if error[0] == errno.EPERM:
 
521
                    logger.warning(u"No permission to"
 
522
                                   u" bind to interface %s",
 
523
                                   self.settings["interface"])
 
524
                else:
 
525
                    raise error
960
526
        # Only bind(2) the socket if we really need to.
961
527
        if self.server_address[0] or self.server_address[1]:
962
528
            if not self.server_address[0]:
963
 
                if self.address_family == socket.AF_INET6:
964
 
                    any_address = u"::" # in6addr_any
965
 
                else:
966
 
                    any_address = socket.INADDR_ANY
967
 
                self.server_address = (any_address,
 
529
                in6addr_any = "::"
 
530
                self.server_address = (in6addr_any,
968
531
                                       self.server_address[1])
969
 
            elif not self.server_address[1]:
 
532
            elif self.server_address[1] is None:
970
533
                self.server_address = (self.server_address[0],
971
534
                                       0)
972
 
#                 if self.interface:
973
 
#                     self.server_address = (self.server_address[0],
974
 
#                                            0, # port
975
 
#                                            0, # flowinfo
976
 
#                                            if_nametoindex
977
 
#                                            (self.interface))
978
 
            return socketserver.TCPServer.server_bind(self)
979
 
 
980
 
 
981
 
class MandosServer(IPv6_TCPServer):
982
 
    """Mandos server.
983
 
    
984
 
    Attributes:
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
 
535
            return super(type(self), self).server_bind()
1083
536
 
1084
537
 
1085
538
def string_to_delta(interval):
1086
539
    """Parse a string and return a datetime.timedelta
1087
 
    
1088
 
    >>> string_to_delta(u'7d')
 
540
 
 
541
    >>> string_to_delta('7d')
1089
542
    datetime.timedelta(7)
1090
 
    >>> string_to_delta(u'60s')
 
543
    >>> string_to_delta('60s')
1091
544
    datetime.timedelta(0, 60)
1092
 
    >>> string_to_delta(u'60m')
 
545
    >>> string_to_delta('60m')
1093
546
    datetime.timedelta(0, 3600)
1094
 
    >>> string_to_delta(u'24h')
 
547
    >>> string_to_delta('24h')
1095
548
    datetime.timedelta(1)
1096
549
    >>> string_to_delta(u'1w')
1097
550
    datetime.timedelta(7)
1098
 
    >>> string_to_delta(u'5m 30s')
1099
 
    datetime.timedelta(0, 330)
1100
551
    """
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):
 
552
    try:
 
553
        suffix=unicode(interval[-1])
 
554
        value=int(interval[:-1])
 
555
        if suffix == u"d":
 
556
            delta = datetime.timedelta(value)
 
557
        elif suffix == u"s":
 
558
            delta = datetime.timedelta(0, value)
 
559
        elif suffix == u"m":
 
560
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
561
        elif suffix == u"h":
 
562
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
563
        elif suffix == u"w":
 
564
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
565
        else:
1119
566
            raise ValueError
1120
 
        timevalue += delta
1121
 
    return timevalue
1122
 
 
1123
 
 
1124
 
def if_nametoindex(interface):
1125
 
    """Call the C function if_nametoindex(), or equivalent
 
567
    except (ValueError, IndexError):
 
568
        raise ValueError
 
569
    return delta
 
570
 
 
571
 
 
572
def server_state_changed(state):
 
573
    """Derived from the Avahi example code"""
 
574
    if state == avahi.SERVER_COLLISION:
 
575
        logger.warning(u"Server name collision")
 
576
        service.remove()
 
577
    elif state == avahi.SERVER_RUNNING:
 
578
        service.add()
 
579
 
 
580
 
 
581
def entry_group_state_changed(state, error):
 
582
    """Derived from the Avahi example code"""
 
583
    logger.debug(u"state change: %i", state)
1126
584
    
1127
 
    Note: This function cannot accept a unicode string."""
1128
 
    global if_nametoindex
 
585
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
586
        logger.debug(u"Service established.")
 
587
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
588
        logger.warning(u"Service name collision.")
 
589
        service.rename()
 
590
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
591
        logger.critical(u"Error in group state changed %s",
 
592
                        unicode(error))
 
593
        raise AvahiGroupError("State changed: %s", str(error))
 
594
 
 
595
def if_nametoindex(interface, _func=[None]):
 
596
    """Call the C function if_nametoindex(), or equivalent"""
 
597
    if _func[0] is not None:
 
598
        return _func[0](interface)
1129
599
    try:
1130
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1131
 
                          (ctypes.util.find_library(u"c"))
1132
 
                          .if_nametoindex)
 
600
        if "ctypes.util" not in sys.modules:
 
601
            import ctypes.util
 
602
        while True:
 
603
            try:
 
604
                libc = ctypes.cdll.LoadLibrary\
 
605
                       (ctypes.util.find_library("c"))
 
606
                func[0] = libc.if_nametoindex
 
607
                return _func[0](interface)
 
608
            except IOError, e:
 
609
                if e != errno.EINTR:
 
610
                    raise
1133
611
    except (OSError, AttributeError):
1134
 
        logger.warning(u"Doing if_nametoindex the hard way")
1135
 
        def if_nametoindex(interface):
 
612
        if "struct" not in sys.modules:
 
613
            import struct
 
614
        if "fcntl" not in sys.modules:
 
615
            import fcntl
 
616
        def the_hard_way(interface):
1136
617
            "Get an interface index the hard way, i.e. using fcntl()"
1137
618
            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]
 
619
            s = socket.socket()
 
620
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
621
                                struct.pack("16s16x", interface))
 
622
            s.close()
 
623
            interface_index = struct.unpack("I", ifreq[16:20])[0]
1144
624
            return interface_index
1145
 
    return if_nametoindex(interface)
1146
 
 
1147
 
 
1148
 
def daemon(nochdir = False, noclose = False):
 
625
        _func[0] = the_hard_way
 
626
        return _func[0](interface)
 
627
 
 
628
 
 
629
def daemon(nochdir, noclose):
1149
630
    """See daemon(3).  Standard BSD Unix function.
1150
 
    
1151
631
    This should really exist as os.daemon, but it doesn't (yet)."""
1152
632
    if os.fork():
1153
633
        sys.exit()
1154
634
    os.setsid()
1155
635
    if not nochdir:
1156
 
        os.chdir(u"/")
1157
 
    if os.fork():
1158
 
        sys.exit()
 
636
        os.chdir("/")
1159
637
    if not noclose:
1160
638
        # Close all standard open file descriptors
1161
639
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1162
640
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1163
641
            raise OSError(errno.ENODEV,
1164
 
                          u"/dev/null not a character device")
 
642
                          "/dev/null not a character device")
1165
643
        os.dup2(null, sys.stdin.fileno())
1166
644
        os.dup2(null, sys.stdout.fileno())
1167
645
        os.dup2(null, sys.stderr.fileno())
1170
648
 
1171
649
 
1172
650
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]
 
651
    global main_loop_started
 
652
    main_loop_started = False
 
653
    
 
654
    parser = OptionParser()
 
655
    parser.add_option("-i", "--interface", type="string",
 
656
                      metavar="IF", help="Bind to interface IF")
 
657
    parser.add_option("-a", "--address", type="string",
 
658
                      help="Address to listen for requests on")
 
659
    parser.add_option("-p", "--port", type="int",
 
660
                      help="Port number to receive requests on")
 
661
    parser.add_option("--check", action="store_true", default=False,
 
662
                      help="Run self-test")
 
663
    parser.add_option("--debug", action="store_true", default=False,
 
664
                      help="Debug mode; run in foreground and log to"
 
665
                      " terminal")
 
666
    parser.add_option("--priority", type="string", help="GnuTLS"
 
667
                      " priority string (see GnuTLS documentation)")
 
668
    parser.add_option("--servicename", type="string", metavar="NAME",
 
669
                      help="Zeroconf service name")
 
670
    parser.add_option("--configdir", type="string",
 
671
                      default="/etc/mandos", metavar="DIR",
 
672
                      help="Directory to search for configuration"
 
673
                      " files")
 
674
    (options, args) = parser.parse_args()
1203
675
    
1204
676
    if options.check:
1205
677
        import doctest
1207
679
        sys.exit()
1208
680
    
1209
681
    # 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",
 
682
    server_defaults = { "interface": "",
 
683
                        "address": "",
 
684
                        "port": "",
 
685
                        "debug": "False",
 
686
                        "priority":
 
687
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
688
                        "servicename": "Mandos",
1219
689
                        }
1220
690
    
1221
691
    # Parse config file for server-global settings
1222
 
    server_config = configparser.SafeConfigParser(server_defaults)
 
692
    server_config = ConfigParser.SafeConfigParser(server_defaults)
1223
693
    del server_defaults
1224
 
    server_config.read(os.path.join(options.configdir,
1225
 
                                    u"mandos.conf"))
 
694
    server_config.read(os.path.join(options.configdir, "server.conf"))
 
695
    server_section = "server"
1226
696
    # 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")
 
697
    server_settings = dict(server_config.items(server_section))
 
698
    # Use getboolean on the boolean config option
 
699
    server_settings["debug"] = server_config.getboolean\
 
700
                               (server_section, "debug")
1235
701
    del server_config
 
702
    if not server_settings["interface"]:
 
703
        server_settings["interface"] = avahi.IF_UNSPEC
1236
704
    
1237
705
    # Override the settings from the config file with command line
1238
706
    # 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"):
 
707
    for option in ("interface", "address", "port", "debug",
 
708
                   "priority", "servicename", "configdir"):
1242
709
        value = getattr(options, option)
1243
710
        if value is not None:
1244
711
            server_settings[option] = value
1245
712
    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
713
    # Now we have our good server settings in "server_settings"
1251
714
    
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
715
    # 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"",
 
716
    client_defaults = { "timeout": "1h",
 
717
                        "interval": "5m",
 
718
                        "checker": "fping -q -- %%(fqdn)s",
1274
719
                        }
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))
 
720
    client_config = ConfigParser.SafeConfigParser(client_defaults)
 
721
    client_config.read(os.path.join(server_settings["configdir"],
 
722
                                    "clients.conf"))
 
723
    
 
724
    global service
 
725
    service = AvahiService(name = server_settings["servicename"],
 
726
                           type = "_mandos._tcp", );
1329
727
    
1330
728
    global main_loop
 
729
    global bus
 
730
    global server
1331
731
    # From the Avahi example code
1332
732
    DBusGMainLoop(set_as_default=True )
1333
733
    main_loop = gobject.MainLoop()
1334
734
    bus = dbus.SystemBus()
 
735
    server = dbus.Interface(
 
736
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
737
            avahi.DBUS_INTERFACE_SERVER )
1335
738
    # 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
739
    
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")
 
740
    debug = server_settings["debug"]
1355
741
    
1356
742
    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
 
743
        console = logging.StreamHandler()
 
744
        # console.setLevel(logging.DEBUG)
 
745
        console.setFormatter(logging.Formatter\
 
746
                             ('%(levelname)s: %(message)s'))
 
747
        logger.addHandler(console)
 
748
        del console
 
749
    
 
750
    clients = Set()
 
751
    def remove_from_clients(client):
 
752
        clients.remove(client)
 
753
        if not clients:
 
754
            logger.debug(u"No clients left, exiting")
 
755
            sys.exit()
 
756
    
 
757
    clients.update(Set(Client(name=section,
 
758
                              stop_hook = remove_from_clients,
 
759
                              **(dict(client_config\
 
760
                                      .items(section))))
 
761
                       for section in client_config.sections()))
 
762
    
 
763
    if not debug:
 
764
        daemon(False, False)
1380
765
    
1381
766
    def cleanup():
1382
767
        "Cleanup function; run on exit"
1383
 
        service.cleanup()
 
768
        global group
 
769
        # From the Avahi example code
 
770
        if not group is None:
 
771
            group.Free()
 
772
            group = None
 
773
        # End of Avahi example code
1384
774
        
1385
 
        while tcp_server.clients:
1386
 
            client = tcp_server.clients.pop()
1387
 
            client.disable_hook = None
1388
 
            client.disable()
 
775
        while clients:
 
776
            client = clients.pop()
 
777
            client.stop_hook = None
 
778
            client.stop()
1389
779
    
1390
780
    atexit.register(cleanup)
1391
781
    
1394
784
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1395
785
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1396
786
    
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
 
    
 
787
    for client in clients:
 
788
        client.start()
 
789
    
 
790
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
791
                                 server_settings["port"]),
 
792
                                tcp_handler,
 
793
                                settings=server_settings,
 
794
                                clients=clients)
1462
795
    # Find out what port we got
1463
796
    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())
 
797
    logger.debug(u"Now listening on port %d", service.port)
1471
798
    
1472
 
    #service.interface = tcp_server.socket.getsockname()[3]
 
799
    if not server_settings["interface"]:
 
800
        service.interface = if_nametoindex\
 
801
                            (server_settings["interface"])
1473
802
    
1474
803
    try:
1475
804
        # From the Avahi example code
 
805
        server.connect_to_signal("StateChanged", server_state_changed)
1476
806
        try:
1477
 
            service.activate()
 
807
            server_state_changed(server.GetState())
1478
808
        except dbus.exceptions.DBusException, error:
1479
809
            logger.critical(u"DBusException: %s", error)
1480
810
            sys.exit(1)
1482
812
        
1483
813
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1484
814
                             lambda *args, **kwargs:
1485
 
                             (tcp_server.handle_request
1486
 
                              (*args[2:], **kwargs) or True))
 
815
                             tcp_server.handle_request\
 
816
                             (*args[2:], **kwargs) or True)
1487
817
        
1488
 
        logger.debug(u"Starting main loop")
 
818
        logger.debug("Starting main loop")
 
819
        main_loop_started = True
1489
820
        main_loop.run()
1490
821
    except AvahiError, error:
1491
 
        logger.critical(u"AvahiError: %s", error)
 
822
        logger.critical(u"AvahiError: %s" + unicode(error))
1492
823
        sys.exit(1)
1493
824
    except KeyboardInterrupt:
1494
825
        if debug:
1495
 
            print >> sys.stderr
1496
 
        logger.debug(u"Server received KeyboardInterrupt")
1497
 
    logger.debug(u"Server exiting")
 
826
            print
1498
827
 
1499
828
if __name__ == '__main__':
1500
829
    main()