/mandos/trunk

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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
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# This program is partly derived from an example program for an Avahi
7
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# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add" and "remove" in the "AvahiService" class, the
10
 
# "server_state_changed" and "entry_group_state_changed" functions,
11
 
# and some lines in "main".
 
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 Teddy Hogeborn
15
 
# Copyright © 2008 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
34
import SocketServer
37
35
import socket
 
36
import select
38
37
from optparse import OptionParser
39
38
import datetime
40
39
import errno
55
54
import stat
56
55
import logging
57
56
import logging.handlers
58
 
import pwd
59
 
from contextlib import closing
60
57
 
61
58
import dbus
62
 
import dbus.service
63
59
import gobject
64
60
import avahi
65
61
from dbus.mainloop.glib import DBusGMainLoop
66
62
import ctypes
67
 
import ctypes.util
68
 
 
69
 
version = "1.0.2"
 
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
 
70
75
 
71
76
logger = logging.Logger('mandos')
72
 
syslogger = (logging.handlers.SysLogHandler
73
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
74
 
              address = "/dev/log"))
75
 
syslogger.setFormatter(logging.Formatter
76
 
                       ('Mandos: %(levelname)s: %(message)s'))
 
77
syslogger = logging.handlers.SysLogHandler\
 
78
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
 
79
syslogger.setFormatter(logging.Formatter\
 
80
                        ('%(levelname)s: %(message)s'))
77
81
logger.addHandler(syslogger)
 
82
del syslogger
78
83
 
79
 
console = logging.StreamHandler()
80
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
81
 
                                       ' %(message)s'))
82
 
logger.addHandler(console)
83
84
 
84
85
class AvahiError(Exception):
85
 
    def __init__(self, value, *args, **kwargs):
 
86
    def __init__(self, value):
86
87
        self.value = value
87
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
88
 
    def __unicode__(self):
89
 
        return unicode(repr(self.value))
 
88
    def __str__(self):
 
89
        return repr(self.value)
90
90
 
91
91
class AvahiServiceError(AvahiError):
92
92
    pass
96
96
 
97
97
 
98
98
class AvahiService(object):
99
 
    """An Avahi (Zeroconf) service.
100
 
    Attributes:
 
99
    """
101
100
    interface: integer; avahi.IF_UNSPEC or an interface index.
102
101
               Used to optionally bind to the specified interface.
103
 
    name: string; Example: 'Mandos'
104
 
    type: string; Example: '_mandos._tcp'.
105
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
106
 
    port: integer; what port to announce
107
 
    TXT: list of strings; TXT record for the service
108
 
    domain: string; Domain to publish on, default to .local if empty.
109
 
    host: string; Host to publish records for, default is localhost
110
 
    max_renames: integer; maximum number of renames
111
 
    rename_count: integer; counter so we only rename after collisions
112
 
                  a sensible number of times
 
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
113
113
    """
114
114
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
115
 
                 servicetype = None, port = None, TXT = None,
116
 
                 domain = "", host = "", max_renames = 32768):
 
115
                 type = None, port = None, TXT = None, domain = "",
 
116
                 host = "", max_renames = 12):
 
117
        """An Avahi (Zeroconf) service. """
117
118
        self.interface = interface
118
119
        self.name = name
119
 
        self.type = servicetype
 
120
        self.type = type
120
121
        self.port = port
121
 
        self.TXT = TXT if TXT is not None else []
 
122
        if TXT is None:
 
123
            self.TXT = []
 
124
        else:
 
125
            self.TXT = TXT
122
126
        self.domain = domain
123
127
        self.host = host
124
128
        self.rename_count = 0
125
 
        self.max_renames = max_renames
126
129
    def rename(self):
127
130
        """Derived from the Avahi example code"""
128
131
        if self.rename_count >= self.max_renames:
129
 
            logger.critical(u"No suitable Zeroconf service name found"
130
 
                            u" after %i retries, exiting.",
131
 
                            self.rename_count)
132
 
            raise AvahiServiceError(u"Too many renames")
133
 
        self.name = server.GetAlternativeServiceName(self.name)
134
 
        logger.info(u"Changing Zeroconf service name to %r ...",
135
 
                    str(self.name))
136
 
        syslogger.setFormatter(logging.Formatter
137
 
                               ('Mandos (%s): %%(levelname)s:'
138
 
                                ' %%(message)s' % self.name))
 
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)
139
137
        self.remove()
140
138
        self.add()
141
139
        self.rename_count += 1
147
145
        """Derived from the Avahi example code"""
148
146
        global group
149
147
        if group is None:
150
 
            group = dbus.Interface(bus.get_object
151
 
                                   (avahi.DBUS_NAME,
 
148
            group = dbus.Interface\
 
149
                    (bus.get_object(avahi.DBUS_NAME,
152
150
                                    server.EntryGroupNew()),
153
 
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
151
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
154
152
            group.connect_to_signal('StateChanged',
155
153
                                    entry_group_state_changed)
156
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
154
        logger.debug(u"Adding service '%s' of type '%s' ...",
157
155
                     service.name, service.type)
158
156
        group.AddService(
159
157
                self.interface,         # interface
170
168
# End of Avahi example code
171
169
 
172
170
 
173
 
def _datetime_to_dbus(dt, variant_level=0):
174
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
175
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
176
 
 
177
 
 
178
 
class Client(dbus.service.Object):
 
171
class Client(object):
179
172
    """A representation of a client host served by this server.
180
173
    Attributes:
181
 
    name:       string; from the config file, used in log messages
 
174
    name:      string; from the config file, used in log messages
182
175
    fingerprint: string (40 or 32 hexadecimal digits); used to
183
176
                 uniquely identify the client
184
 
    secret:     bytestring; sent verbatim (over TLS) to client
185
 
    host:       string; available for use by the checker command
186
 
    created:    datetime.datetime(); (UTC) object creation
187
 
    last_enabled: datetime.datetime(); (UTC)
188
 
    enabled:    bool()
189
 
    last_checked_ok: datetime.datetime(); (UTC) or None
190
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
191
 
                                      until this client is invalid
192
 
    interval:   datetime.timedelta(); How often to start a new checker
193
 
    disable_hook:  If set, called by disable() as disable_hook(self)
194
 
    checker:    subprocess.Popen(); a running checker process used
195
 
                                    to see if the client lives.
196
 
                                    '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.
197
188
    checker_initiator_tag: a gobject event source tag, or None
198
 
    disable_initiator_tag:    - '' -
 
189
    stop_initiator_tag:    - '' -
199
190
    checker_callback_tag:  - '' -
200
191
    checker_command: string; External command which is run to check if
201
192
                     client lives.  %() expansions are done at
202
193
                     runtime with vars(self) as dict, so that for
203
194
                     instance %(name)s can be used in the command.
204
 
    use_dbus: bool(); Whether to provide D-Bus interface and signals
205
 
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
 
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: - '' -
206
200
    """
207
 
    def timeout_milliseconds(self):
208
 
        "Return the 'timeout' attribute in milliseconds"
209
 
        return ((self.timeout.days * 24 * 60 * 60 * 1000)
210
 
                + (self.timeout.seconds * 1000)
211
 
                + (self.timeout.microseconds // 1000))
212
 
    
213
 
    def interval_milliseconds(self):
214
 
        "Return the 'interval' attribute in milliseconds"
215
 
        return ((self.interval.days * 24 * 60 * 60 * 1000)
216
 
                + (self.interval.seconds * 1000)
217
 
                + (self.interval.microseconds // 1000))
218
 
    
219
 
    def __init__(self, name = None, disable_hook=None, config=None,
220
 
                 use_dbus=True):
221
 
        """Note: the 'checker' key in 'config' sets the
222
 
        'checker_command' attribute and *not* the 'checker'
223
 
        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.."""
224
229
        self.name = name
225
 
        if config is None:
226
 
            config = {}
227
230
        logger.debug(u"Creating client %r", self.name)
228
 
        self.use_dbus = use_dbus
229
 
        if self.use_dbus:
230
 
            self.dbus_object_path = (dbus.ObjectPath
231
 
                                     ("/Mandos/clients/"
232
 
                                      + self.name.replace(".", "_")))
233
 
            dbus.service.Object.__init__(self, bus,
234
 
                                         self.dbus_object_path)
235
 
        # Uppercase and remove spaces from fingerprint for later
236
 
        # comparison purposes with return value from the fingerprint()
237
 
        # function
238
 
        self.fingerprint = (config["fingerprint"].upper()
239
 
                            .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"")
240
235
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
241
 
        if "secret" in config:
242
 
            self.secret = config["secret"].decode(u"base64")
243
 
        elif "secfile" in config:
244
 
            with closing(open(os.path.expanduser
245
 
                              (os.path.expandvars
246
 
                               (config["secfile"])))) as secfile:
247
 
                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()
248
242
        else:
249
243
            raise TypeError(u"No secret or secfile for client %s"
250
244
                            % self.name)
251
 
        self.host = config.get("host", "")
252
 
        self.created = datetime.datetime.utcnow()
253
 
        self.enabled = False
254
 
        self.last_enabled = None
 
245
        self.fqdn = fqdn
 
246
        self.created = datetime.datetime.now()
255
247
        self.last_checked_ok = None
256
 
        self.timeout = string_to_delta(config["timeout"])
257
 
        self.interval = string_to_delta(config["interval"])
258
 
        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
259
251
        self.checker = None
260
252
        self.checker_initiator_tag = None
261
 
        self.disable_initiator_tag = None
 
253
        self.stop_initiator_tag = None
262
254
        self.checker_callback_tag = None
263
 
        self.checker_command = config["checker"]
264
 
    
265
 
    def enable(self):
 
255
        self.check_command = checker
 
256
    def start(self):
266
257
        """Start this client's checker and timeout hooks"""
267
 
        self.last_enabled = datetime.datetime.utcnow()
268
258
        # Schedule a new checker to be started an 'interval' from now,
269
259
        # and every interval from then on.
270
 
        self.checker_initiator_tag = (gobject.timeout_add
271
 
                                      (self.interval_milliseconds(),
272
 
                                       self.start_checker))
 
260
        self.checker_initiator_tag = gobject.timeout_add\
 
261
                                     (self._interval_milliseconds,
 
262
                                      self.start_checker)
273
263
        # Also start a new checker *right now*.
274
264
        self.start_checker()
275
 
        # Schedule a disable() when 'timeout' has passed
276
 
        self.disable_initiator_tag = (gobject.timeout_add
277
 
                                   (self.timeout_milliseconds(),
278
 
                                    self.disable))
279
 
        self.enabled = True
280
 
        if self.use_dbus:
281
 
            # Emit D-Bus signals
282
 
            self.PropertyChanged(dbus.String(u"enabled"),
283
 
                                 dbus.Boolean(True, variant_level=1))
284
 
            self.PropertyChanged(dbus.String(u"last_enabled"),
285
 
                                 (_datetime_to_dbus(self.last_enabled,
286
 
                                                    variant_level=1)))
287
 
    
288
 
    def disable(self):
289
 
        """Disable this client."""
290
 
        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:
291
278
            return False
292
 
        logger.info(u"Disabling client %s", self.name)
293
 
        if getattr(self, "disable_initiator_tag", False):
294
 
            gobject.source_remove(self.disable_initiator_tag)
295
 
            self.disable_initiator_tag = None
 
279
        if getattr(self, "stop_initiator_tag", False):
 
280
            gobject.source_remove(self.stop_initiator_tag)
 
281
            self.stop_initiator_tag = None
296
282
        if getattr(self, "checker_initiator_tag", False):
297
283
            gobject.source_remove(self.checker_initiator_tag)
298
284
            self.checker_initiator_tag = None
299
285
        self.stop_checker()
300
 
        if self.disable_hook:
301
 
            self.disable_hook(self)
302
 
        self.enabled = False
303
 
        if self.use_dbus:
304
 
            # Emit D-Bus signal
305
 
            self.PropertyChanged(dbus.String(u"enabled"),
306
 
                                 dbus.Boolean(False, variant_level=1))
 
286
        if self.stop_hook:
 
287
            self.stop_hook(self)
307
288
        # Do not run this again if called by a gobject.timeout_add
308
289
        return False
309
 
    
310
290
    def __del__(self):
311
 
        self.disable_hook = None
312
 
        self.disable()
313
 
    
314
 
    def checker_callback(self, pid, condition, command):
 
291
        self.stop_hook = None
 
292
        self.stop()
 
293
    def checker_callback(self, pid, condition):
315
294
        """The checker has completed, so take appropriate actions."""
 
295
        now = datetime.datetime.now()
316
296
        self.checker_callback_tag = None
317
297
        self.checker = None
318
 
        if self.use_dbus:
319
 
            # Emit D-Bus signal
320
 
            self.PropertyChanged(dbus.String(u"checker_running"),
321
 
                                 dbus.Boolean(False, variant_level=1))
322
 
        if (os.WIFEXITED(condition)
323
 
            and (os.WEXITSTATUS(condition) == 0)):
324
 
            logger.info(u"Checker for %(name)s succeeded",
325
 
                        vars(self))
326
 
            if self.use_dbus:
327
 
                # Emit D-Bus signal
328
 
                self.CheckerCompleted(dbus.Boolean(True),
329
 
                                      dbus.UInt16(condition),
330
 
                                      dbus.String(command))
331
 
            self.bump_timeout()
 
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)
332
307
        elif not os.WIFEXITED(condition):
333
308
            logger.warning(u"Checker for %(name)s crashed?",
334
309
                           vars(self))
335
 
            if self.use_dbus:
336
 
                # Emit D-Bus signal
337
 
                self.CheckerCompleted(dbus.Boolean(False),
338
 
                                      dbus.UInt16(condition),
339
 
                                      dbus.String(command))
340
310
        else:
341
 
            logger.info(u"Checker for %(name)s failed",
342
 
                        vars(self))
343
 
            if self.use_dbus:
344
 
                # Emit D-Bus signal
345
 
                self.CheckerCompleted(dbus.Boolean(False),
346
 
                                      dbus.UInt16(condition),
347
 
                                      dbus.String(command))
348
 
    
349
 
    def bump_timeout(self):
350
 
        """Bump up the timeout for this client.
351
 
        This should only be called when the client has been seen,
352
 
        alive and well.
353
 
        """
354
 
        self.last_checked_ok = datetime.datetime.utcnow()
355
 
        gobject.source_remove(self.disable_initiator_tag)
356
 
        self.disable_initiator_tag = (gobject.timeout_add
357
 
                                      (self.timeout_milliseconds(),
358
 
                                       self.disable))
359
 
        if self.use_dbus:
360
 
            # Emit D-Bus signal
361
 
            self.PropertyChanged(
362
 
                dbus.String(u"last_checked_ok"),
363
 
                (_datetime_to_dbus(self.last_checked_ok,
364
 
                                   variant_level=1)))
365
 
    
 
311
            logger.debug(u"Checker for %(name)s failed",
 
312
                         vars(self))
366
313
    def start_checker(self):
367
314
        """Start a new checker subprocess if one is not running.
368
315
        If a checker already exists, leave it running and do
377
324
        # is as it should be.
378
325
        if self.checker is None:
379
326
            try:
380
 
                # In case checker_command has exactly one % operator
381
 
                command = self.checker_command % self.host
 
327
                # In case check_command has exactly one % operator
 
328
                command = self.check_command % self.fqdn
382
329
            except TypeError:
383
330
                # Escape attributes for the shell
384
331
                escaped_attrs = dict((key, re.escape(str(val)))
385
332
                                     for key, val in
386
333
                                     vars(self).iteritems())
387
334
                try:
388
 
                    command = self.checker_command % escaped_attrs
 
335
                    command = self.check_command % escaped_attrs
389
336
                except TypeError, error:
390
337
                    logger.error(u'Could not format string "%s":'
391
 
                                 u' %s', self.checker_command, error)
 
338
                                 u' %s', self.check_command, error)
392
339
                    return True # Try again later
393
340
            try:
394
 
                logger.info(u"Starting checker %r for %s",
395
 
                            command, self.name)
396
 
                # We don't need to redirect stdout and stderr, since
397
 
                # in normal mode, that is already done by daemon(),
398
 
                # and in debug mode we don't want to.  (Stdin is
399
 
                # always replaced by /dev/null.)
 
341
                logger.debug(u"Starting checker %r for %s",
 
342
                             command, self.name)
400
343
                self.checker = subprocess.Popen(command,
401
344
                                                close_fds=True,
402
345
                                                shell=True, cwd="/")
403
 
                if self.use_dbus:
404
 
                    # Emit D-Bus signal
405
 
                    self.CheckerStarted(command)
406
 
                    self.PropertyChanged(
407
 
                        dbus.String("checker_running"),
408
 
                        dbus.Boolean(True, variant_level=1))
409
 
                self.checker_callback_tag = (gobject.child_watch_add
410
 
                                             (self.checker.pid,
411
 
                                              self.checker_callback,
412
 
                                              data=command))
413
 
            except OSError, error:
 
346
                self.checker_callback_tag = gobject.child_watch_add\
 
347
                                            (self.checker.pid,
 
348
                                             self.checker_callback)
 
349
            except subprocess.OSError, error:
414
350
                logger.error(u"Failed to start subprocess: %s",
415
351
                             error)
416
352
        # Re-run this periodically if run by gobject.timeout_add
417
353
        return True
418
 
    
419
354
    def stop_checker(self):
420
355
        """Force the checker process, if any, to stop."""
421
356
        if self.checker_callback_tag:
423
358
            self.checker_callback_tag = None
424
359
        if getattr(self, "checker", None) is None:
425
360
            return
426
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
361
        logger.debug("Stopping checker for %(name)s", vars(self))
427
362
        try:
428
363
            os.kill(self.checker.pid, signal.SIGTERM)
429
364
            #os.sleep(0.5)
433
368
            if error.errno != errno.ESRCH: # No such process
434
369
                raise
435
370
        self.checker = None
436
 
        if self.use_dbus:
437
 
            self.PropertyChanged(dbus.String(u"checker_running"),
438
 
                                 dbus.Boolean(False, variant_level=1))
439
 
    
440
371
    def still_valid(self):
441
372
        """Has the timeout not yet passed for this client?"""
442
 
        if not getattr(self, "enabled", False):
443
 
            return False
444
 
        now = datetime.datetime.utcnow()
 
373
        now = datetime.datetime.now()
445
374
        if self.last_checked_ok is None:
446
375
            return now < (self.created + self.timeout)
447
376
        else:
448
377
            return now < (self.last_checked_ok + self.timeout)
449
 
    
450
 
    ## D-Bus methods & signals
451
 
    _interface = u"org.mandos_system.Mandos.Client"
452
 
    
453
 
    # BumpTimeout - method
454
 
    BumpTimeout = dbus.service.method(_interface)(bump_timeout)
455
 
    BumpTimeout.__name__ = "BumpTimeout"
456
 
    
457
 
    # CheckerCompleted - signal
458
 
    @dbus.service.signal(_interface, signature="bqs")
459
 
    def CheckerCompleted(self, success, condition, command):
460
 
        "D-Bus signal"
461
 
        pass
462
 
    
463
 
    # CheckerStarted - signal
464
 
    @dbus.service.signal(_interface, signature="s")
465
 
    def CheckerStarted(self, command):
466
 
        "D-Bus signal"
467
 
        pass
468
 
    
469
 
    # GetAllProperties - method
470
 
    @dbus.service.method(_interface, out_signature="a{sv}")
471
 
    def GetAllProperties(self):
472
 
        "D-Bus method"
473
 
        return dbus.Dictionary({
474
 
                dbus.String("name"):
475
 
                    dbus.String(self.name, variant_level=1),
476
 
                dbus.String("fingerprint"):
477
 
                    dbus.String(self.fingerprint, variant_level=1),
478
 
                dbus.String("host"):
479
 
                    dbus.String(self.host, variant_level=1),
480
 
                dbus.String("created"):
481
 
                    _datetime_to_dbus(self.created, variant_level=1),
482
 
                dbus.String("last_enabled"):
483
 
                    (_datetime_to_dbus(self.last_enabled,
484
 
                                       variant_level=1)
485
 
                     if self.last_enabled is not None
486
 
                     else dbus.Boolean(False, variant_level=1)),
487
 
                dbus.String("enabled"):
488
 
                    dbus.Boolean(self.enabled, variant_level=1),
489
 
                dbus.String("last_checked_ok"):
490
 
                    (_datetime_to_dbus(self.last_checked_ok,
491
 
                                       variant_level=1)
492
 
                     if self.last_checked_ok is not None
493
 
                     else dbus.Boolean (False, variant_level=1)),
494
 
                dbus.String("timeout"):
495
 
                    dbus.UInt64(self.timeout_milliseconds(),
496
 
                                variant_level=1),
497
 
                dbus.String("interval"):
498
 
                    dbus.UInt64(self.interval_milliseconds(),
499
 
                                variant_level=1),
500
 
                dbus.String("checker"):
501
 
                    dbus.String(self.checker_command,
502
 
                                variant_level=1),
503
 
                dbus.String("checker_running"):
504
 
                    dbus.Boolean(self.checker is not None,
505
 
                                 variant_level=1),
506
 
                }, signature="sv")
507
 
    
508
 
    # IsStillValid - method
509
 
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
510
 
                    (still_valid))
511
 
    IsStillValid.__name__ = "IsStillValid"
512
 
    
513
 
    # PropertyChanged - signal
514
 
    @dbus.service.signal(_interface, signature="sv")
515
 
    def PropertyChanged(self, property, value):
516
 
        "D-Bus signal"
517
 
        pass
518
 
    
519
 
    # SetChecker - method
520
 
    @dbus.service.method(_interface, in_signature="s")
521
 
    def SetChecker(self, checker):
522
 
        "D-Bus setter method"
523
 
        self.checker_command = checker
524
 
        # Emit D-Bus signal
525
 
        self.PropertyChanged(dbus.String(u"checker"),
526
 
                             dbus.String(self.checker_command,
527
 
                                         variant_level=1))
528
 
    
529
 
    # SetHost - method
530
 
    @dbus.service.method(_interface, in_signature="s")
531
 
    def SetHost(self, host):
532
 
        "D-Bus setter method"
533
 
        self.host = host
534
 
        # Emit D-Bus signal
535
 
        self.PropertyChanged(dbus.String(u"host"),
536
 
                             dbus.String(self.host, variant_level=1))
537
 
    
538
 
    # SetInterval - method
539
 
    @dbus.service.method(_interface, in_signature="t")
540
 
    def SetInterval(self, milliseconds):
541
 
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
542
 
        # Emit D-Bus signal
543
 
        self.PropertyChanged(dbus.String(u"interval"),
544
 
                             (dbus.UInt64(self.interval_milliseconds(),
545
 
                                          variant_level=1)))
546
 
    
547
 
    # SetSecret - method
548
 
    @dbus.service.method(_interface, in_signature="ay",
549
 
                         byte_arrays=True)
550
 
    def SetSecret(self, secret):
551
 
        "D-Bus setter method"
552
 
        self.secret = str(secret)
553
 
    
554
 
    # SetTimeout - method
555
 
    @dbus.service.method(_interface, in_signature="t")
556
 
    def SetTimeout(self, milliseconds):
557
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
558
 
        # Emit D-Bus signal
559
 
        self.PropertyChanged(dbus.String(u"timeout"),
560
 
                             (dbus.UInt64(self.timeout_milliseconds(),
561
 
                                          variant_level=1)))
562
 
    
563
 
    # Enable - method
564
 
    Enable = dbus.service.method(_interface)(enable)
565
 
    Enable.__name__ = "Enable"
566
 
    
567
 
    # StartChecker - method
568
 
    @dbus.service.method(_interface)
569
 
    def StartChecker(self):
570
 
        "D-Bus method"
571
 
        self.start_checker()
572
 
    
573
 
    # Disable - method
574
 
    @dbus.service.method(_interface)
575
 
    def Disable(self):
576
 
        "D-Bus method"
577
 
        self.disable()
578
 
    
579
 
    # StopChecker - method
580
 
    StopChecker = dbus.service.method(_interface)(stop_checker)
581
 
    StopChecker.__name__ = "StopChecker"
582
 
    
583
 
    del _interface
584
378
 
585
379
 
586
380
def peer_certificate(session):
587
381
    "Return the peer's OpenPGP certificate as a bytestring"
588
382
    # If not an OpenPGP certificate...
589
 
    if (gnutls.library.functions
590
 
        .gnutls_certificate_type_get(session._c_object)
591
 
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
383
    if gnutls.library.functions.gnutls_certificate_type_get\
 
384
            (session._c_object) \
 
385
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
592
386
        # ...do the normal thing
593
387
        return session.peer_certificate
594
388
    list_size = ctypes.c_uint()
595
 
    cert_list = (gnutls.library.functions
596
 
                 .gnutls_certificate_get_peers
597
 
                 (session._c_object, ctypes.byref(list_size)))
 
389
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
390
        (session._c_object, ctypes.byref(list_size))
598
391
    if list_size.value == 0:
599
392
        return None
600
393
    cert = cert_list[0]
603
396
 
604
397
def fingerprint(openpgp):
605
398
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
606
 
    # New GnuTLS "datum" with the OpenPGP public key
607
 
    datum = (gnutls.library.types
608
 
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
609
 
                                         ctypes.POINTER
610
 
                                         (ctypes.c_ubyte)),
611
 
                             ctypes.c_uint(len(openpgp))))
612
399
    # New empty GnuTLS certificate
613
400
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
614
 
    (gnutls.library.functions
615
 
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
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)))
616
408
    # Import the OpenPGP public key into the certificate
617
 
    (gnutls.library.functions
618
 
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
619
 
                                gnutls.library.constants
620
 
                                .GNUTLS_OPENPGP_FMT_RAW))
621
 
    # Verify the self signature in the key
622
 
    crtverify = ctypes.c_uint()
623
 
    (gnutls.library.functions
624
 
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
625
 
    if crtverify.value != 0:
626
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
627
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
409
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
410
        (crt,
 
411
         ctypes.byref(datum),
 
412
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
628
413
    # New buffer for the fingerprint
629
 
    buf = ctypes.create_string_buffer(20)
630
 
    buf_len = ctypes.c_size_t()
 
414
    buffer = ctypes.create_string_buffer(20)
 
415
    buffer_length = ctypes.c_size_t()
631
416
    # Get the fingerprint from the certificate into the buffer
632
 
    (gnutls.library.functions
633
 
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
634
 
                                         ctypes.byref(buf_len)))
 
417
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
418
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
635
419
    # Deinit the certificate
636
420
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
637
421
    # Convert the buffer to a Python bytestring
638
 
    fpr = ctypes.string_at(buf, buf_len.value)
 
422
    fpr = ctypes.string_at(buffer, buffer_length.value)
639
423
    # Convert the bytestring to hexadecimal notation
640
424
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
641
425
    return hex_fpr
642
426
 
643
427
 
644
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
428
class tcp_handler(SocketServer.BaseRequestHandler, object):
645
429
    """A TCP request handler class.
646
430
    Instantiated by IPv6_TCPServer for each request to handle it.
647
431
    Note: This will run in its own forked process."""
648
432
    
649
433
    def handle(self):
650
 
        logger.info(u"TCP connection from: %s",
651
 
                    unicode(self.client_address))
652
 
        session = (gnutls.connection
653
 
                   .ClientSession(self.request,
654
 
                                  gnutls.connection
655
 
                                  .X509Credentials()))
656
 
        
657
 
        line = self.request.makefile().readline()
658
 
        logger.debug(u"Protocol version: %r", line)
659
 
        try:
660
 
            if int(line.strip().split()[0]) > 1:
661
 
                raise RuntimeError
662
 
        except (ValueError, IndexError, RuntimeError), error:
663
 
            logger.error(u"Unknown protocol version: %s", error)
664
 
            return
665
 
        
 
434
        logger.debug(u"TCP connection from: %s",
 
435
                     unicode(self.client_address))
 
436
        session = gnutls.connection.ClientSession\
 
437
                  (self.request, gnutls.connection.X509Credentials())
666
438
        # Note: gnutls.connection.X509Credentials is really a generic
667
439
        # GnuTLS certificate credentials object so long as no X.509
668
440
        # keys are added to it.  Therefore, we can use it here despite
671
443
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
672
444
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
673
445
        #                "+DHE-DSS"))
674
 
        # Use a fallback default, since this MUST be set.
675
 
        priority = self.server.settings.get("priority", "NORMAL")
676
 
        (gnutls.library.functions
677
 
         .gnutls_priority_set_direct(session._c_object,
678
 
                                     priority, None))
 
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);
679
452
        
680
453
        try:
681
454
            session.handshake()
682
455
        except gnutls.errors.GNUTLSError, error:
683
 
            logger.warning(u"Handshake failed: %s", error)
 
456
            logger.debug(u"Handshake failed: %s", error)
684
457
            # Do not run session.bye() here: the session is not
685
458
            # established.  Just abandon the request.
686
459
            return
687
460
        try:
688
461
            fpr = fingerprint(peer_certificate(session))
689
462
        except (TypeError, gnutls.errors.GNUTLSError), error:
690
 
            logger.warning(u"Bad certificate: %s", error)
 
463
            logger.debug(u"Bad certificate: %s", error)
691
464
            session.bye()
692
465
            return
693
466
        logger.debug(u"Fingerprint: %s", fpr)
 
467
        client = None
694
468
        for c in self.server.clients:
695
469
            if c.fingerprint == fpr:
696
470
                client = c
697
471
                break
698
 
        else:
699
 
            logger.warning(u"Client not found for fingerprint: %s",
700
 
                           fpr)
 
472
        if not client:
 
473
            logger.debug(u"Client not found for fingerprint: %s", fpr)
701
474
            session.bye()
702
475
            return
703
476
        # Have to check if client.still_valid(), since it is possible
704
477
        # that the client timed out while establishing the GnuTLS
705
478
        # session.
706
479
        if not client.still_valid():
707
 
            logger.warning(u"Client %(name)s is invalid",
708
 
                           vars(client))
 
480
            logger.debug(u"Client %(name)s is invalid", vars(client))
709
481
            session.bye()
710
482
            return
711
 
        ## This won't work here, since we're in a fork.
712
 
        # client.bump_timeout()
713
483
        sent_size = 0
714
484
        while sent_size < len(client.secret):
715
485
            sent = session.send(client.secret[sent_size:])
720
490
        session.bye()
721
491
 
722
492
 
723
 
class IPv6_TCPServer(SocketServer.ForkingMixIn,
724
 
                     SocketServer.TCPServer, object):
 
493
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
725
494
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
726
495
    Attributes:
727
496
        settings:       Server settings
728
497
        clients:        Set() of Client objects
729
 
        enabled:        Boolean; whether this server is activated yet
730
498
    """
731
499
    address_family = socket.AF_INET6
732
500
    def __init__(self, *args, **kwargs):
736
504
        if "clients" in kwargs:
737
505
            self.clients = kwargs["clients"]
738
506
            del kwargs["clients"]
739
 
        self.enabled = False
740
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
507
        return super(type(self), self).__init__(*args, **kwargs)
741
508
    def server_bind(self):
742
509
        """This overrides the normal server_bind() function
743
510
        to bind to an interface if one was specified, and also NOT to
744
511
        bind to an address or port if they were not specified."""
745
 
        if self.settings["interface"]:
 
512
        if self.settings["interface"] != avahi.IF_UNSPEC:
746
513
            # 25 is from /usr/include/asm-i486/socket.h
747
514
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
748
515
            try:
751
518
                                       self.settings["interface"])
752
519
            except socket.error, error:
753
520
                if error[0] == errno.EPERM:
754
 
                    logger.error(u"No permission to"
755
 
                                 u" bind to interface %s",
756
 
                                 self.settings["interface"])
 
521
                    logger.warning(u"No permission to"
 
522
                                   u" bind to interface %s",
 
523
                                   self.settings["interface"])
757
524
                else:
758
525
                    raise error
759
526
        # Only bind(2) the socket if we really need to.
762
529
                in6addr_any = "::"
763
530
                self.server_address = (in6addr_any,
764
531
                                       self.server_address[1])
765
 
            elif not self.server_address[1]:
 
532
            elif self.server_address[1] is None:
766
533
                self.server_address = (self.server_address[0],
767
534
                                       0)
768
 
#                 if self.settings["interface"]:
769
 
#                     self.server_address = (self.server_address[0],
770
 
#                                            0, # port
771
 
#                                            0, # flowinfo
772
 
#                                            if_nametoindex
773
 
#                                            (self.settings
774
 
#                                             ["interface"]))
775
 
            return super(IPv6_TCPServer, self).server_bind()
776
 
    def server_activate(self):
777
 
        if self.enabled:
778
 
            return super(IPv6_TCPServer, self).server_activate()
779
 
    def enable(self):
780
 
        self.enabled = True
 
535
            return super(type(self), self).server_bind()
781
536
 
782
537
 
783
538
def string_to_delta(interval):
793
548
    datetime.timedelta(1)
794
549
    >>> string_to_delta(u'1w')
795
550
    datetime.timedelta(7)
796
 
    >>> string_to_delta('5m 30s')
797
 
    datetime.timedelta(0, 330)
798
551
    """
799
 
    timevalue = datetime.timedelta(0)
800
 
    for s in interval.split():
801
 
        try:
802
 
            suffix = unicode(s[-1])
803
 
            value = int(s[:-1])
804
 
            if suffix == u"d":
805
 
                delta = datetime.timedelta(value)
806
 
            elif suffix == u"s":
807
 
                delta = datetime.timedelta(0, value)
808
 
            elif suffix == u"m":
809
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
810
 
            elif suffix == u"h":
811
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
812
 
            elif suffix == u"w":
813
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
814
 
            else:
815
 
                raise ValueError
816
 
        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:
817
566
            raise ValueError
818
 
        timevalue += delta
819
 
    return timevalue
 
567
    except (ValueError, IndexError):
 
568
        raise ValueError
 
569
    return delta
820
570
 
821
571
 
822
572
def server_state_changed(state):
823
573
    """Derived from the Avahi example code"""
824
574
    if state == avahi.SERVER_COLLISION:
825
 
        logger.error(u"Zeroconf server name collision")
 
575
        logger.warning(u"Server name collision")
826
576
        service.remove()
827
577
    elif state == avahi.SERVER_RUNNING:
828
578
        service.add()
830
580
 
831
581
def entry_group_state_changed(state, error):
832
582
    """Derived from the Avahi example code"""
833
 
    logger.debug(u"Avahi state change: %i", state)
 
583
    logger.debug(u"state change: %i", state)
834
584
    
835
585
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
836
 
        logger.debug(u"Zeroconf service established.")
 
586
        logger.debug(u"Service established.")
837
587
    elif state == avahi.ENTRY_GROUP_COLLISION:
838
 
        logger.warning(u"Zeroconf service name collision.")
 
588
        logger.warning(u"Service name collision.")
839
589
        service.rename()
840
590
    elif state == avahi.ENTRY_GROUP_FAILURE:
841
 
        logger.critical(u"Avahi: Error in group state changed %s",
 
591
        logger.critical(u"Error in group state changed %s",
842
592
                        unicode(error))
843
 
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
 
593
        raise AvahiGroupError("State changed: %s", str(error))
844
594
 
845
 
def if_nametoindex(interface):
 
595
def if_nametoindex(interface, _func=[None]):
846
596
    """Call the C function if_nametoindex(), or equivalent"""
847
 
    global if_nametoindex
 
597
    if _func[0] is not None:
 
598
        return _func[0](interface)
848
599
    try:
849
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
850
 
                          (ctypes.util.find_library("c"))
851
 
                          .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
852
611
    except (OSError, AttributeError):
853
612
        if "struct" not in sys.modules:
854
613
            import struct
855
614
        if "fcntl" not in sys.modules:
856
615
            import fcntl
857
 
        def if_nametoindex(interface):
 
616
        def the_hard_way(interface):
858
617
            "Get an interface index the hard way, i.e. using fcntl()"
859
618
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
860
 
            with closing(socket.socket()) as s:
861
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
862
 
                                    struct.pack("16s16x", interface))
 
619
            s = socket.socket()
 
620
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
621
                                struct.pack("16s16x", interface))
 
622
            s.close()
863
623
            interface_index = struct.unpack("I", ifreq[16:20])[0]
864
624
            return interface_index
865
 
    return if_nametoindex(interface)
866
 
 
867
 
 
868
 
def daemon(nochdir = False, noclose = False):
 
625
        _func[0] = the_hard_way
 
626
        return _func[0](interface)
 
627
 
 
628
 
 
629
def daemon(nochdir, noclose):
869
630
    """See daemon(3).  Standard BSD Unix function.
870
631
    This should really exist as os.daemon, but it doesn't (yet)."""
871
632
    if os.fork():
873
634
    os.setsid()
874
635
    if not nochdir:
875
636
        os.chdir("/")
876
 
    if os.fork():
877
 
        sys.exit()
878
637
    if not noclose:
879
638
        # Close all standard open file descriptors
880
639
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
889
648
 
890
649
 
891
650
def main():
892
 
    parser = OptionParser(version = "%%prog %s" % version)
 
651
    global main_loop_started
 
652
    main_loop_started = False
 
653
    
 
654
    parser = OptionParser()
893
655
    parser.add_option("-i", "--interface", type="string",
894
656
                      metavar="IF", help="Bind to interface IF")
895
657
    parser.add_option("-a", "--address", type="string",
896
658
                      help="Address to listen for requests on")
897
659
    parser.add_option("-p", "--port", type="int",
898
660
                      help="Port number to receive requests on")
899
 
    parser.add_option("--check", action="store_true",
 
661
    parser.add_option("--check", action="store_true", default=False,
900
662
                      help="Run self-test")
901
 
    parser.add_option("--debug", action="store_true",
 
663
    parser.add_option("--debug", action="store_true", default=False,
902
664
                      help="Debug mode; run in foreground and log to"
903
665
                      " terminal")
904
666
    parser.add_option("--priority", type="string", help="GnuTLS"
909
671
                      default="/etc/mandos", metavar="DIR",
910
672
                      help="Directory to search for configuration"
911
673
                      " files")
912
 
    parser.add_option("--no-dbus", action="store_false",
913
 
                      dest="use_dbus",
914
 
                      help="Do not provide D-Bus system bus"
915
 
                      " interface")
916
 
    options = parser.parse_args()[0]
 
674
    (options, args) = parser.parse_args()
917
675
    
918
676
    if options.check:
919
677
        import doctest
928
686
                        "priority":
929
687
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
930
688
                        "servicename": "Mandos",
931
 
                        "use_dbus": "True",
932
689
                        }
933
690
    
934
691
    # Parse config file for server-global settings
935
692
    server_config = ConfigParser.SafeConfigParser(server_defaults)
936
693
    del server_defaults
937
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
694
    server_config.read(os.path.join(options.configdir, "server.conf"))
 
695
    server_section = "server"
938
696
    # Convert the SafeConfigParser object to a dict
939
 
    server_settings = server_config.defaults()
940
 
    # Use getboolean on the boolean config options
941
 
    server_settings["debug"] = (server_config.getboolean
942
 
                                ("DEFAULT", "debug"))
943
 
    server_settings["use_dbus"] = (server_config.getboolean
944
 
                                   ("DEFAULT", "use_dbus"))
 
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")
945
701
    del server_config
 
702
    if not server_settings["interface"]:
 
703
        server_settings["interface"] = avahi.IF_UNSPEC
946
704
    
947
705
    # Override the settings from the config file with command line
948
706
    # options, if set.
949
707
    for option in ("interface", "address", "port", "debug",
950
 
                   "priority", "servicename", "configdir",
951
 
                   "use_dbus"):
 
708
                   "priority", "servicename", "configdir"):
952
709
        value = getattr(options, option)
953
710
        if value is not None:
954
711
            server_settings[option] = value
955
712
    del options
956
713
    # Now we have our good server settings in "server_settings"
957
714
    
958
 
    # For convenience
959
 
    debug = server_settings["debug"]
960
 
    use_dbus = server_settings["use_dbus"]
961
 
    
962
 
    if not debug:
963
 
        syslogger.setLevel(logging.WARNING)
964
 
        console.setLevel(logging.WARNING)
965
 
    
966
 
    if server_settings["servicename"] != "Mandos":
967
 
        syslogger.setFormatter(logging.Formatter
968
 
                               ('Mandos (%s): %%(levelname)s:'
969
 
                                ' %%(message)s'
970
 
                                % server_settings["servicename"]))
971
 
    
972
715
    # Parse config file with clients
973
716
    client_defaults = { "timeout": "1h",
974
717
                        "interval": "5m",
975
 
                        "checker": "fping -q -- %(host)s",
976
 
                        "host": "",
 
718
                        "checker": "fping -q -- %%(fqdn)s",
977
719
                        }
978
720
    client_config = ConfigParser.SafeConfigParser(client_defaults)
979
721
    client_config.read(os.path.join(server_settings["configdir"],
980
722
                                    "clients.conf"))
981
723
    
982
 
    clients = Set()
983
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
984
 
                                 server_settings["port"]),
985
 
                                TCP_handler,
986
 
                                settings=server_settings,
987
 
                                clients=clients)
988
 
    pidfilename = "/var/run/mandos.pid"
989
 
    try:
990
 
        pidfile = open(pidfilename, "w")
991
 
    except IOError, error:
992
 
        logger.error("Could not open file %r", pidfilename)
993
 
    
994
 
    try:
995
 
        uid = pwd.getpwnam("_mandos").pw_uid
996
 
    except KeyError:
997
 
        try:
998
 
            uid = pwd.getpwnam("mandos").pw_uid
999
 
        except KeyError:
1000
 
            try:
1001
 
                uid = pwd.getpwnam("nobody").pw_uid
1002
 
            except KeyError:
1003
 
                uid = 65534
1004
 
    try:
1005
 
        gid = pwd.getpwnam("_mandos").pw_gid
1006
 
    except KeyError:
1007
 
        try:
1008
 
            gid = pwd.getpwnam("mandos").pw_gid
1009
 
        except KeyError:
1010
 
            try:
1011
 
                gid = pwd.getpwnam("nogroup").pw_gid
1012
 
            except KeyError:
1013
 
                gid = 65534
1014
 
    try:
1015
 
        os.setuid(uid)
1016
 
        os.setgid(gid)
1017
 
    except OSError, error:
1018
 
        if error[0] != errno.EPERM:
1019
 
            raise error
1020
 
    
1021
724
    global service
1022
725
    service = AvahiService(name = server_settings["servicename"],
1023
 
                           servicetype = "_mandos._tcp", )
1024
 
    if server_settings["interface"]:
1025
 
        service.interface = (if_nametoindex
1026
 
                             (server_settings["interface"]))
 
726
                           type = "_mandos._tcp", );
1027
727
    
1028
728
    global main_loop
1029
729
    global bus
1032
732
    DBusGMainLoop(set_as_default=True )
1033
733
    main_loop = gobject.MainLoop()
1034
734
    bus = dbus.SystemBus()
1035
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1036
 
                                           avahi.DBUS_PATH_SERVER),
1037
 
                            avahi.DBUS_INTERFACE_SERVER)
 
735
    server = dbus.Interface(
 
736
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
737
            avahi.DBUS_INTERFACE_SERVER )
1038
738
    # End of Avahi example code
1039
 
    if use_dbus:
1040
 
        bus_name = dbus.service.BusName(u"org.mandos-system.Mandos",
1041
 
                                        bus)
1042
 
    
1043
 
    clients.update(Set(Client(name = section,
1044
 
                              config
1045
 
                              = dict(client_config.items(section)),
1046
 
                              use_dbus = use_dbus)
 
739
    
 
740
    debug = server_settings["debug"]
 
741
    
 
742
    if debug:
 
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))))
1047
761
                       for section in client_config.sections()))
1048
 
    if not clients:
1049
 
        logger.critical(u"No clients defined")
1050
 
        sys.exit(1)
1051
 
    
1052
 
    if debug:
1053
 
        # Redirect stdin so all checkers get /dev/null
1054
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1055
 
        os.dup2(null, sys.stdin.fileno())
1056
 
        if null > 2:
1057
 
            os.close(null)
1058
 
    else:
1059
 
        # No console logging
1060
 
        logger.removeHandler(console)
1061
 
        # Close all input and output, do double fork, etc.
1062
 
        daemon()
1063
 
    
1064
 
    try:
1065
 
        pid = os.getpid()
1066
 
        pidfile.write(str(pid) + "\n")
1067
 
        pidfile.close()
1068
 
        del pidfile
1069
 
    except IOError:
1070
 
        logger.error(u"Could not write to file %r with PID %d",
1071
 
                     pidfilename, pid)
1072
 
    except NameError:
1073
 
        # "pidfile" was never created
1074
 
        pass
1075
 
    del pidfilename
 
762
    
 
763
    if not debug:
 
764
        daemon(False, False)
1076
765
    
1077
766
    def cleanup():
1078
767
        "Cleanup function; run on exit"
1085
774
        
1086
775
        while clients:
1087
776
            client = clients.pop()
1088
 
            client.disable_hook = None
1089
 
            client.disable()
 
777
            client.stop_hook = None
 
778
            client.stop()
1090
779
    
1091
780
    atexit.register(cleanup)
1092
781
    
1095
784
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1096
785
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1097
786
    
1098
 
    if use_dbus:
1099
 
        class MandosServer(dbus.service.Object):
1100
 
            """A D-Bus proxy object"""
1101
 
            def __init__(self):
1102
 
                dbus.service.Object.__init__(self, bus,
1103
 
                                             "/Mandos")
1104
 
            _interface = u"org.mandos_system.Mandos"
1105
 
 
1106
 
            @dbus.service.signal(_interface, signature="oa{sv}")
1107
 
            def ClientAdded(self, objpath, properties):
1108
 
                "D-Bus signal"
1109
 
                pass
1110
 
 
1111
 
            @dbus.service.signal(_interface, signature="o")
1112
 
            def ClientRemoved(self, objpath):
1113
 
                "D-Bus signal"
1114
 
                pass
1115
 
 
1116
 
            @dbus.service.method(_interface, out_signature="ao")
1117
 
            def GetAllClients(self):
1118
 
                return dbus.Array(c.dbus_object_path for c in clients)
1119
 
 
1120
 
            @dbus.service.method(_interface, out_signature="a{oa{sv}}")
1121
 
            def GetAllClientsWithProperties(self):
1122
 
                return dbus.Dictionary(
1123
 
                    ((c.dbus_object_path, c.GetAllProperties())
1124
 
                     for c in clients),
1125
 
                    signature="oa{sv}")
1126
 
 
1127
 
            @dbus.service.method(_interface, in_signature="o")
1128
 
            def RemoveClient(self, object_path):
1129
 
                for c in clients:
1130
 
                    if c.dbus_object_path == object_path:
1131
 
                        clients.remove(c)
1132
 
                        # Don't signal anything except ClientRemoved
1133
 
                        c.use_dbus = False
1134
 
                        c.disable()
1135
 
                        # Emit D-Bus signal
1136
 
                        self.ClientRemoved(object_path)
1137
 
                        return
1138
 
                raise KeyError
1139
 
 
1140
 
            del _interface
1141
 
    
1142
 
        mandos_server = MandosServer()
1143
 
    
1144
787
    for client in clients:
1145
 
        if use_dbus:
1146
 
            # Emit D-Bus signal
1147
 
            mandos_server.ClientAdded(client.dbus_object_path,
1148
 
                                      client.GetAllProperties())
1149
 
        client.enable()
1150
 
    
1151
 
    tcp_server.enable()
1152
 
    tcp_server.server_activate()
1153
 
    
 
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)
1154
795
    # Find out what port we got
1155
796
    service.port = tcp_server.socket.getsockname()[1]
1156
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
1157
 
                u" scope_id %d" % tcp_server.socket.getsockname())
 
797
    logger.debug(u"Now listening on port %d", service.port)
1158
798
    
1159
 
    #service.interface = tcp_server.socket.getsockname()[3]
 
799
    if not server_settings["interface"]:
 
800
        service.interface = if_nametoindex\
 
801
                            (server_settings["interface"])
1160
802
    
1161
803
    try:
1162
804
        # From the Avahi example code
1170
812
        
1171
813
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1172
814
                             lambda *args, **kwargs:
1173
 
                             (tcp_server.handle_request
1174
 
                              (*args[2:], **kwargs) or True))
 
815
                             tcp_server.handle_request\
 
816
                             (*args[2:], **kwargs) or True)
1175
817
        
1176
 
        logger.debug(u"Starting main loop")
 
818
        logger.debug("Starting main loop")
 
819
        main_loop_started = True
1177
820
        main_loop.run()
1178
821
    except AvahiError, error:
1179
 
        logger.critical(u"AvahiError: %s", error)
 
822
        logger.critical(u"AvahiError: %s" + unicode(error))
1180
823
        sys.exit(1)
1181
824
    except KeyboardInterrupt:
1182
825
        if debug: