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

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

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

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server.py
1
1
#!/usr/bin/python
2
 
# -*- mode: python; coding: utf-8 -*-
3
 
# 
4
 
# Mandos server - give out binary blobs to connecting clients.
5
 
# 
6
 
# This program is partly derived from an example program for an Avahi
7
 
# service publisher, downloaded from
8
 
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add" and "remove" in the "AvahiService" class, the
10
 
# "server_state_changed" and "entry_group_state_changed" functions,
11
 
# and some lines in "main".
12
 
# 
13
 
# Everything else is
14
 
# Copyright © 2008 Teddy Hogeborn
15
 
# Copyright © 2008 Björn Påhlsson
16
 
# 
17
 
# This program is free software: you can redistribute it and/or modify
18
 
# it under the terms of the GNU General Public License as published by
19
 
# the Free Software Foundation, either version 3 of the License, or
20
 
# (at your option) any later version.
21
 
#
22
 
#     This program is distributed in the hope that it will be useful,
23
 
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
24
 
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25
 
#     GNU General Public License for more details.
26
 
# 
27
 
# You should have received a copy of the GNU General Public License
28
 
# along with this program.  If not, see
29
 
# <http://www.gnu.org/licenses/>.
30
 
# 
31
 
# Contact the authors at <mandos@fukt.bsnet.se>.
32
 
# 
33
2
 
34
 
from __future__ import division, with_statement, absolute_import
 
3
from __future__ import division
35
4
 
36
5
import SocketServer
37
6
import socket
 
7
import select
38
8
from optparse import OptionParser
39
9
import datetime
40
10
import errno
51
21
import signal
52
22
from sets import Set
53
23
import subprocess
54
 
import atexit
55
 
import stat
56
 
import logging
57
 
import logging.handlers
58
 
import pwd
59
 
from contextlib import closing
60
24
 
61
25
import dbus
62
 
import dbus.service
63
26
import gobject
64
27
import avahi
65
28
from dbus.mainloop.glib import DBusGMainLoop
66
29
import ctypes
67
 
import ctypes.util
68
 
 
69
 
version = "1.0.2"
70
 
 
71
 
logger = logging.Logger('mandos')
72
 
syslogger = (logging.handlers.SysLogHandler
73
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
74
 
              address = "/dev/log"))
75
 
syslogger.setFormatter(logging.Formatter
76
 
                       ('Mandos: %(levelname)s: %(message)s'))
77
 
logger.addHandler(syslogger)
78
 
 
79
 
console = logging.StreamHandler()
80
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
81
 
                                       ' %(message)s'))
82
 
logger.addHandler(console)
83
 
 
84
 
class AvahiError(Exception):
85
 
    def __init__(self, value):
86
 
        self.value = value
87
 
        super(AvahiError, self).__init__()
88
 
    def __str__(self):
89
 
        return repr(self.value)
90
 
 
91
 
class AvahiServiceError(AvahiError):
92
 
    pass
93
 
 
94
 
class AvahiGroupError(AvahiError):
95
 
    pass
96
 
 
97
 
 
98
 
class AvahiService(object):
99
 
    """An Avahi (Zeroconf) service.
100
 
    Attributes:
101
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
102
 
               Used to optionally bind to the specified interface.
103
 
    name: string; Example: 'Mandos'
104
 
    type: string; Example: '_mandos._tcp'.
105
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
106
 
    port: integer; what port to announce
107
 
    TXT: list of strings; TXT record for the service
108
 
    domain: string; Domain to publish on, default to .local if empty.
109
 
    host: string; Host to publish records for, default is localhost
110
 
    max_renames: integer; maximum number of renames
111
 
    rename_count: integer; counter so we only rename after collisions
112
 
                  a sensible number of times
113
 
    """
114
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
115
 
                 servicetype = None, port = None, TXT = None,
116
 
                 domain = "", host = "", max_renames = 32768):
117
 
        self.interface = interface
118
 
        self.name = name
119
 
        self.type = servicetype
120
 
        self.port = port
121
 
        self.TXT = TXT if TXT is not None else []
122
 
        self.domain = domain
123
 
        self.host = host
124
 
        self.rename_count = 0
125
 
        self.max_renames = max_renames
126
 
    def rename(self):
127
 
        """Derived from the Avahi example code"""
128
 
        if self.rename_count >= self.max_renames:
129
 
            logger.critical(u"No suitable Zeroconf service name found"
130
 
                            u" after %i retries, exiting.",
131
 
                            self.rename_count)
132
 
            raise AvahiServiceError("Too many renames")
133
 
        self.name = server.GetAlternativeServiceName(self.name)
134
 
        logger.info(u"Changing Zeroconf service name to %r ...",
135
 
                    str(self.name))
136
 
        syslogger.setFormatter(logging.Formatter
137
 
                               ('Mandos (%s): %%(levelname)s:'
138
 
                                ' %%(message)s' % self.name))
139
 
        self.remove()
140
 
        self.add()
141
 
        self.rename_count += 1
142
 
    def remove(self):
143
 
        """Derived from the Avahi example code"""
144
 
        if group is not None:
145
 
            group.Reset()
146
 
    def add(self):
147
 
        """Derived from the Avahi example code"""
148
 
        global group
149
 
        if group is None:
150
 
            group = dbus.Interface(bus.get_object
151
 
                                   (avahi.DBUS_NAME,
152
 
                                    server.EntryGroupNew()),
153
 
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
154
 
            group.connect_to_signal('StateChanged',
155
 
                                    entry_group_state_changed)
156
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
157
 
                     service.name, service.type)
158
 
        group.AddService(
159
 
                self.interface,         # interface
160
 
                avahi.PROTO_INET6,      # protocol
161
 
                dbus.UInt32(0),         # flags
162
 
                self.name, self.type,
163
 
                self.domain, self.host,
164
 
                dbus.UInt16(self.port),
165
 
                avahi.string_array_to_txt_array(self.TXT))
166
 
        group.Commit()
167
 
 
168
 
# From the Avahi example code:
169
 
group = None                            # our entry group
 
30
 
 
31
# This variable is used to optionally bind to a specified interface.
 
32
# It is a global variable to fit in with the other variables from the
 
33
# Avahi server example code.
 
34
serviceInterface = avahi.IF_UNSPEC
 
35
# From the Avahi server example code:
 
36
serviceName = "Mandos"
 
37
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
38
servicePort = None                      # Not known at startup
 
39
serviceTXT = []                         # TXT record for the service
 
40
domain = ""                  # Domain to publish on, default to .local
 
41
host = ""          # Host to publish records for, default to localhost
 
42
group = None #our entry group
 
43
rename_count = 12       # Counter so we only rename after collisions a
 
44
                        # sensible number of times
170
45
# End of Avahi example code
171
46
 
172
47
 
173
 
def _datetime_to_dbus_struct(dt, variant_level=0):
174
 
    """Convert a UTC datetime.datetime() to a D-Bus struct.
175
 
    The format is special to this application, since we could not find
176
 
    any other standard way."""
177
 
    return dbus.Struct((dbus.Int16(dt.year),
178
 
                        dbus.Byte(dt.month),
179
 
                        dbus.Byte(dt.day),
180
 
                        dbus.Byte(dt.hour),
181
 
                        dbus.Byte(dt.minute),
182
 
                        dbus.Byte(dt.second),
183
 
                        dbus.UInt32(dt.microsecond)),
184
 
                       signature="nyyyyyu",
185
 
                       variant_level=variant_level)
186
 
 
187
 
 
188
 
class Client(dbus.service.Object):
 
48
class Client(object):
189
49
    """A representation of a client host served by this server.
190
50
    Attributes:
191
 
    name:       string; from the config file, used in log messages
 
51
    name:      string; from the config file, used in log messages
192
52
    fingerprint: string (40 or 32 hexadecimal digits); used to
193
53
                 uniquely identify the client
194
 
    secret:     bytestring; sent verbatim (over TLS) to client
195
 
    host:       string; available for use by the checker command
196
 
    created:    datetime.datetime(); (UTC) object creation
197
 
    last_started: datetime.datetime(); (UTC)
198
 
    started:    bool()
199
 
    last_checked_ok: datetime.datetime(); (UTC) or None
200
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
201
 
                                      until this client is invalid
202
 
    interval:   datetime.timedelta(); How often to start a new checker
203
 
    stop_hook:  If set, called by stop() as stop_hook(self)
204
 
    checker:    subprocess.Popen(); a running checker process used
205
 
                                    to see if the client lives.
206
 
                                    'None' if no process is running.
 
54
    secret:    bytestring; sent verbatim (over TLS) to client
 
55
    fqdn:      string (FQDN); available for use by the checker command
 
56
    created:   datetime.datetime()
 
57
    last_seen: datetime.datetime() or None if not yet seen
 
58
    timeout:   datetime.timedelta(); How long from last_seen until
 
59
                                     this client is invalid
 
60
    interval:  datetime.timedelta(); How often to start a new checker
 
61
    stop_hook: If set, called by stop() as stop_hook(self)
 
62
    checker:   subprocess.Popen(); a running checker process used
 
63
                                   to see if the client lives.
 
64
                                   Is None if no process is running.
207
65
    checker_initiator_tag: a gobject event source tag, or None
208
66
    stop_initiator_tag:    - '' -
209
67
    checker_callback_tag:  - '' -
210
68
    checker_command: string; External command which is run to check if
211
 
                     client lives.  %() expansions are done at
 
69
                     client lives.  %()s expansions are done at
212
70
                     runtime with vars(self) as dict, so that for
213
71
                     instance %(name)s can be used in the command.
214
 
    dbus_object_path: dbus.ObjectPath
215
72
    Private attibutes:
216
73
    _timeout: Real variable for 'timeout'
217
74
    _interval: Real variable for 'interval'
218
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
75
    _timeout_milliseconds: Used by gobject.timeout_add()
219
76
    _interval_milliseconds: - '' -
220
77
    """
221
78
    def _set_timeout(self, timeout):
222
 
        "Setter function for the 'timeout' attribute"
 
79
        "Setter function for 'timeout' attribute"
223
80
        self._timeout = timeout
224
81
        self._timeout_milliseconds = ((self.timeout.days
225
82
                                       * 24 * 60 * 60 * 1000)
226
83
                                      + (self.timeout.seconds * 1000)
227
84
                                      + (self.timeout.microseconds
228
85
                                         // 1000))
229
 
        # Emit D-Bus signal
230
 
        self.PropertyChanged(dbus.String(u"timeout"),
231
 
                             (dbus.UInt64(self._timeout_milliseconds,
232
 
                                          variant_level=1)))
233
 
    timeout = property(lambda self: self._timeout, _set_timeout)
 
86
    timeout = property(lambda self: self._timeout,
 
87
                       _set_timeout)
234
88
    del _set_timeout
235
 
    
236
89
    def _set_interval(self, interval):
237
 
        "Setter function for the 'interval' attribute"
 
90
        "Setter function for 'interval' attribute"
238
91
        self._interval = interval
239
92
        self._interval_milliseconds = ((self.interval.days
240
93
                                        * 24 * 60 * 60 * 1000)
242
95
                                          * 1000)
243
96
                                       + (self.interval.microseconds
244
97
                                          // 1000))
245
 
        # Emit D-Bus signal
246
 
        self.PropertyChanged(dbus.String(u"interval"),
247
 
                             (dbus.UInt64(self._interval_milliseconds,
248
 
                                          variant_level=1)))
249
 
    interval = property(lambda self: self._interval, _set_interval)
 
98
    interval = property(lambda self: self._interval,
 
99
                        _set_interval)
250
100
    del _set_interval
251
 
    
252
 
    def __init__(self, name = None, stop_hook=None, config=None):
253
 
        """Note: the 'checker' key in 'config' sets the
254
 
        'checker_command' attribute and *not* the 'checker'
255
 
        attribute."""
256
 
        self.dbus_object_path = (dbus.ObjectPath
257
 
                                 ("/Mandos/clients/"
258
 
                                  + name.replace(".", "_")))
259
 
        dbus.service.Object.__init__(self, bus,
260
 
                                     self.dbus_object_path)
261
 
        if config is None:
262
 
            config = {}
 
101
    def __init__(self, name=None, options=None, stop_hook=None,
 
102
                 fingerprint=None, secret=None, secfile=None, fqdn=None,
 
103
                 timeout=None, interval=-1, checker=None):
263
104
        self.name = name
264
 
        logger.debug(u"Creating client %r", self.name)
265
 
        # Uppercase and remove spaces from fingerprint for later
266
 
        # comparison purposes with return value from the fingerprint()
267
 
        # function
268
 
        self.fingerprint = (config["fingerprint"].upper()
269
 
                            .replace(u" ", u""))
270
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
271
 
        if "secret" in config:
272
 
            self.secret = config["secret"].decode(u"base64")
273
 
        elif "secfile" in config:
274
 
            with closing(open(os.path.expanduser
275
 
                              (os.path.expandvars
276
 
                               (config["secfile"])))) as secfile:
277
 
                self.secret = secfile.read()
278
 
        else:
279
 
            raise TypeError(u"No secret or secfile for client %s"
280
 
                            % self.name)
281
 
        self.host = config.get("host", "")
282
 
        self.created = datetime.datetime.utcnow()
283
 
        self.started = False
284
 
        self.last_started = None
285
 
        self.last_checked_ok = None
286
 
        self.timeout = string_to_delta(config["timeout"])
287
 
        self.interval = string_to_delta(config["interval"])
 
105
        # Uppercase and remove spaces from fingerprint
 
106
        # for later comparison purposes with return value of
 
107
        # the fingerprint() function
 
108
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
109
        if secret:
 
110
            self.secret = secret.decode(u"base64")
 
111
        elif secfile:
 
112
            sf = open(secfile)
 
113
            self.secret = sf.read()
 
114
            sf.close()
 
115
        else:
 
116
            raise RuntimeError(u"No secret or secfile for client %s"
 
117
                               % self.name)
 
118
        self.fqdn = fqdn                # string
 
119
        self.created = datetime.datetime.now()
 
120
        self.last_seen = None
 
121
        if timeout is None:
 
122
            timeout = options.timeout
 
123
        self.timeout = timeout
 
124
        if interval == -1:
 
125
            interval = options.interval
 
126
        else:
 
127
            interval = string_to_delta(interval)
 
128
        self.interval = interval
288
129
        self.stop_hook = stop_hook
289
130
        self.checker = None
290
131
        self.checker_initiator_tag = None
291
132
        self.stop_initiator_tag = None
292
133
        self.checker_callback_tag = None
293
 
        self.checker_command = config["checker"]
294
 
    
 
134
        self.check_command = checker
295
135
    def start(self):
296
 
        """Start this client's checker and timeout hooks"""
297
 
        self.last_started = datetime.datetime.utcnow()
 
136
        """Start this clients checker and timeout hooks"""
298
137
        # Schedule a new checker to be started an 'interval' from now,
299
138
        # and every interval from then on.
300
 
        self.checker_initiator_tag = (gobject.timeout_add
301
 
                                      (self._interval_milliseconds,
302
 
                                       self.start_checker))
 
139
        self.checker_initiator_tag = gobject.timeout_add\
 
140
                                     (self._interval_milliseconds,
 
141
                                      self.start_checker)
303
142
        # Also start a new checker *right now*.
304
143
        self.start_checker()
305
144
        # Schedule a stop() when 'timeout' has passed
306
 
        self.stop_initiator_tag = (gobject.timeout_add
307
 
                                   (self._timeout_milliseconds,
308
 
                                    self.stop))
309
 
        self.started = True
310
 
        # Emit D-Bus signal
311
 
        self.PropertyChanged(dbus.String(u"started"),
312
 
                             dbus.Boolean(True, variant_level=1))
313
 
        self.PropertyChanged(dbus.String(u"last_started"),
314
 
                             (_datetime_to_dbus_struct
315
 
                              (self.last_started, variant_level=1)))
316
 
    
 
145
        self.stop_initiator_tag = gobject.timeout_add\
 
146
                                  (self._timeout_milliseconds,
 
147
                                   self.stop)
317
148
    def stop(self):
318
 
        """Stop this client."""
319
 
        if not getattr(self, "started", False):
320
 
            return False
321
 
        logger.info(u"Stopping client %s", self.name)
322
 
        if getattr(self, "stop_initiator_tag", False):
 
149
        """Stop this client.
 
150
        The possibility that this client might be restarted is left
 
151
        open, but not currently used."""
 
152
        if debug:
 
153
            sys.stderr.write(u"Stopping client %s\n" % self.name)
 
154
        self.secret = None
 
155
        if self.stop_initiator_tag:
323
156
            gobject.source_remove(self.stop_initiator_tag)
324
157
            self.stop_initiator_tag = None
325
 
        if getattr(self, "checker_initiator_tag", False):
 
158
        if self.checker_initiator_tag:
326
159
            gobject.source_remove(self.checker_initiator_tag)
327
160
            self.checker_initiator_tag = None
328
161
        self.stop_checker()
329
162
        if self.stop_hook:
330
163
            self.stop_hook(self)
331
 
        self.started = False
332
 
        # Emit D-Bus signal
333
 
        self.PropertyChanged(dbus.String(u"started"),
334
 
                             dbus.Boolean(False, variant_level=1))
335
164
        # Do not run this again if called by a gobject.timeout_add
336
165
        return False
337
 
    
338
166
    def __del__(self):
339
 
        self.stop_hook = None
340
 
        self.stop()
341
 
    
342
 
    def checker_callback(self, pid, condition, command):
 
167
        # Some code duplication here and in stop()
 
168
        if hasattr(self, "stop_initiator_tag") \
 
169
               and self.stop_initiator_tag:
 
170
            gobject.source_remove(self.stop_initiator_tag)
 
171
            self.stop_initiator_tag = None
 
172
        if hasattr(self, "checker_initiator_tag") \
 
173
               and self.checker_initiator_tag:
 
174
            gobject.source_remove(self.checker_initiator_tag)
 
175
            self.checker_initiator_tag = None
 
176
        self.stop_checker()
 
177
    def checker_callback(self, pid, condition):
343
178
        """The checker has completed, so take appropriate actions."""
 
179
        now = datetime.datetime.now()
 
180
        if os.WIFEXITED(condition) \
 
181
               and (os.WEXITSTATUS(condition) == 0):
 
182
            if debug:
 
183
                sys.stderr.write(u"Checker for %(name)s succeeded\n"
 
184
                                 % vars(self))
 
185
            self.last_seen = now
 
186
            gobject.source_remove(self.stop_initiator_tag)
 
187
            self.stop_initiator_tag = gobject.timeout_add\
 
188
                                      (self._timeout_milliseconds,
 
189
                                       self.stop)
 
190
        elif debug:
 
191
            if not os.WIFEXITED(condition):
 
192
                sys.stderr.write(u"Checker for %(name)s crashed?\n"
 
193
                                 % vars(self))
 
194
            else:
 
195
                sys.stderr.write(u"Checker for %(name)s failed\n"
 
196
                                 % vars(self))
 
197
        self.checker = None
344
198
        self.checker_callback_tag = None
345
 
        self.checker = None
346
 
        # Emit D-Bus signal
347
 
        self.PropertyChanged(dbus.String(u"checker_running"),
348
 
                             dbus.Boolean(False, variant_level=1))
349
 
        if (os.WIFEXITED(condition)
350
 
            and (os.WEXITSTATUS(condition) == 0)):
351
 
            logger.info(u"Checker for %(name)s succeeded",
352
 
                        vars(self))
353
 
            # Emit D-Bus signal
354
 
            self.CheckerCompleted(dbus.Boolean(True),
355
 
                                  dbus.UInt16(condition),
356
 
                                  dbus.String(command))
357
 
            self.bump_timeout()
358
 
        elif not os.WIFEXITED(condition):
359
 
            logger.warning(u"Checker for %(name)s crashed?",
360
 
                           vars(self))
361
 
            # Emit D-Bus signal
362
 
            self.CheckerCompleted(dbus.Boolean(False),
363
 
                                  dbus.UInt16(condition),
364
 
                                  dbus.String(command))
365
 
        else:
366
 
            logger.info(u"Checker for %(name)s failed",
367
 
                        vars(self))
368
 
            # Emit D-Bus signal
369
 
            self.CheckerCompleted(dbus.Boolean(False),
370
 
                                  dbus.UInt16(condition),
371
 
                                  dbus.String(command))
372
 
    
373
 
    def bump_timeout(self):
374
 
        """Bump up the timeout for this client.
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.stop_initiator_tag)
380
 
        self.stop_initiator_tag = (gobject.timeout_add
381
 
                                   (self._timeout_milliseconds,
382
 
                                    self.stop))
383
 
        self.PropertyChanged(dbus.String(u"last_checked_ok"),
384
 
                             (_datetime_to_dbus_struct
385
 
                              (self.last_checked_ok,
386
 
                               variant_level=1)))
387
 
    
388
199
    def start_checker(self):
389
200
        """Start a new checker subprocess if one is not running.
390
201
        If a checker already exists, leave it running and do
391
202
        nothing."""
392
 
        # The reason for not killing a running checker is that if we
393
 
        # did that, then if a checker (for some reason) started
394
 
        # running slowly and taking more than 'interval' time, the
395
 
        # client would inevitably timeout, since no checker would get
396
 
        # a chance to run to completion.  If we instead leave running
397
 
        # checkers alone, the checker would have to take more time
398
 
        # than 'timeout' for the client to be declared invalid, which
399
 
        # is as it should be.
400
203
        if self.checker is None:
 
204
            if debug:
 
205
                sys.stderr.write(u"Starting checker for %s\n"
 
206
                                 % self.name)
401
207
            try:
402
 
                # In case checker_command has exactly one % operator
403
 
                command = self.checker_command % self.host
 
208
                command = self.check_command % self.fqdn
404
209
            except TypeError:
405
 
                # Escape attributes for the shell
406
210
                escaped_attrs = dict((key, re.escape(str(val)))
407
211
                                     for key, val in
408
212
                                     vars(self).iteritems())
409
 
                try:
410
 
                    command = self.checker_command % escaped_attrs
411
 
                except TypeError, error:
412
 
                    logger.error(u'Could not format string "%s":'
413
 
                                 u' %s', self.checker_command, error)
414
 
                    return True # Try again later
 
213
                command = self.check_command % escaped_attrs
415
214
            try:
416
 
                logger.info(u"Starting checker %r for %s",
417
 
                            command, self.name)
418
 
                # We don't need to redirect stdout and stderr, since
419
 
                # in normal mode, that is already done by daemon(),
420
 
                # and in debug mode we don't want to.  (Stdin is
421
 
                # always replaced by /dev/null.)
422
 
                self.checker = subprocess.Popen(command,
423
 
                                                close_fds=True,
424
 
                                                shell=True, cwd="/")
425
 
                # Emit D-Bus signal
426
 
                self.CheckerStarted(command)
427
 
                self.PropertyChanged(dbus.String("checker_running"),
428
 
                                     dbus.Boolean(True, variant_level=1))
429
 
                self.checker_callback_tag = (gobject.child_watch_add
430
 
                                             (self.checker.pid,
431
 
                                              self.checker_callback,
432
 
                                              data=command))
433
 
            except OSError, error:
434
 
                logger.error(u"Failed to start subprocess: %s",
435
 
                             error)
 
215
                self.checker = subprocess.\
 
216
                               Popen(command,
 
217
                                     stdout=subprocess.PIPE,
 
218
                                     close_fds=True, shell=True,
 
219
                                     cwd="/")
 
220
                self.checker_callback_tag = gobject.\
 
221
                                            child_watch_add(self.checker.pid,
 
222
                                                            self.\
 
223
                                                            checker_callback)
 
224
            except subprocess.OSError, error:
 
225
                sys.stderr.write(u"Failed to start subprocess: %s\n"
 
226
                                 % error)
436
227
        # Re-run this periodically if run by gobject.timeout_add
437
228
        return True
438
 
    
439
229
    def stop_checker(self):
440
230
        """Force the checker process, if any, to stop."""
441
 
        if self.checker_callback_tag:
442
 
            gobject.source_remove(self.checker_callback_tag)
443
 
            self.checker_callback_tag = None
444
 
        if getattr(self, "checker", None) is None:
 
231
        if not hasattr(self, "checker") or self.checker is None:
445
232
            return
446
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
447
 
        try:
448
 
            os.kill(self.checker.pid, signal.SIGTERM)
449
 
            #os.sleep(0.5)
450
 
            #if self.checker.poll() is None:
451
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
452
 
        except OSError, error:
453
 
            if error.errno != errno.ESRCH: # No such process
454
 
                raise
 
233
        gobject.source_remove(self.checker_callback_tag)
 
234
        self.checker_callback_tag = None
 
235
        os.kill(self.checker.pid, signal.SIGTERM)
 
236
        if self.checker.poll() is None:
 
237
            os.kill(self.checker.pid, signal.SIGKILL)
455
238
        self.checker = None
456
 
        self.PropertyChanged(dbus.String(u"checker_running"),
457
 
                             dbus.Boolean(False, variant_level=1))
458
 
    
459
 
    def still_valid(self):
 
239
    def still_valid(self, now=None):
460
240
        """Has the timeout not yet passed for this client?"""
461
 
        if not getattr(self, "started", False):
462
 
            return False
463
 
        now = datetime.datetime.utcnow()
464
 
        if self.last_checked_ok is None:
 
241
        if now is None:
 
242
            now = datetime.datetime.now()
 
243
        if self.last_seen is None:
465
244
            return now < (self.created + self.timeout)
466
245
        else:
467
 
            return now < (self.last_checked_ok + self.timeout)
468
 
    
469
 
    ## D-Bus methods & signals
470
 
    _interface = u"org.mandos_system.Mandos.Client"
471
 
    
472
 
    # BumpTimeout - method
473
 
    BumpTimeout = dbus.service.method(_interface)(bump_timeout)
474
 
    BumpTimeout.__name__ = "BumpTimeout"
475
 
    
476
 
    # CheckerCompleted - signal
477
 
    @dbus.service.signal(_interface, signature="bqs")
478
 
    def CheckerCompleted(self, success, condition, command):
479
 
        "D-Bus signal"
480
 
        pass
481
 
    
482
 
    # CheckerStarted - signal
483
 
    @dbus.service.signal(_interface, signature="s")
484
 
    def CheckerStarted(self, command):
485
 
        "D-Bus signal"
486
 
        pass
487
 
    
488
 
    # GetAllProperties - method
489
 
    @dbus.service.method(_interface, out_signature="a{sv}")
490
 
    def GetAllProperties(self):
491
 
        "D-Bus method"
492
 
        return dbus.Dictionary({
493
 
                dbus.String("name"):
494
 
                    dbus.String(self.name, variant_level=1),
495
 
                dbus.String("fingerprint"):
496
 
                    dbus.String(self.fingerprint, variant_level=1),
497
 
                dbus.String("host"):
498
 
                    dbus.String(self.host, variant_level=1),
499
 
                dbus.String("created"):
500
 
                    _datetime_to_dbus_struct(self.created,
501
 
                                             variant_level=1),
502
 
                dbus.String("last_started"):
503
 
                    (_datetime_to_dbus_struct(self.last_started,
504
 
                                              variant_level=1)
505
 
                     if self.last_started is not None
506
 
                     else dbus.Boolean(False, variant_level=1)),
507
 
                dbus.String("started"):
508
 
                    dbus.Boolean(self.started, variant_level=1),
509
 
                dbus.String("last_checked_ok"):
510
 
                    (_datetime_to_dbus_struct(self.last_checked_ok,
511
 
                                              variant_level=1)
512
 
                     if self.last_checked_ok is not None
513
 
                     else dbus.Boolean (False, variant_level=1)),
514
 
                dbus.String("timeout"):
515
 
                    dbus.UInt64(self._timeout_milliseconds,
516
 
                                variant_level=1),
517
 
                dbus.String("interval"):
518
 
                    dbus.UInt64(self._interval_milliseconds,
519
 
                                variant_level=1),
520
 
                dbus.String("checker"):
521
 
                    dbus.String(self.checker_command,
522
 
                                variant_level=1),
523
 
                dbus.String("checker_running"):
524
 
                    dbus.Boolean(self.checker is not None,
525
 
                                 variant_level=1),
526
 
                }, signature="sv")
527
 
    
528
 
    # IsStillValid - method
529
 
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
530
 
                    (still_valid))
531
 
    IsStillValid.__name__ = "IsStillValid"
532
 
    
533
 
    # PropertyChanged - signal
534
 
    @dbus.service.signal(_interface, signature="sv")
535
 
    def PropertyChanged(self, property, value):
536
 
        "D-Bus signal"
537
 
        pass
538
 
    
539
 
    # SetChecker - method
540
 
    @dbus.service.method(_interface, in_signature="s")
541
 
    def SetChecker(self, checker):
542
 
        "D-Bus setter method"
543
 
        self.checker_command = checker
544
 
    
545
 
    # SetHost - method
546
 
    @dbus.service.method(_interface, in_signature="s")
547
 
    def SetHost(self, host):
548
 
        "D-Bus setter method"
549
 
        self.host = host
550
 
    
551
 
    # SetInterval - method
552
 
    @dbus.service.method(_interface, in_signature="t")
553
 
    def SetInterval(self, milliseconds):
554
 
        self.interval = datetime.timdeelta(0, 0, 0, milliseconds)
555
 
    
556
 
    # SetSecret - method
557
 
    @dbus.service.method(_interface, in_signature="ay",
558
 
                         byte_arrays=True)
559
 
    def SetSecret(self, secret):
560
 
        "D-Bus setter method"
561
 
        self.secret = str(secret)
562
 
    
563
 
    # SetTimeout - method
564
 
    @dbus.service.method(_interface, in_signature="t")
565
 
    def SetTimeout(self, milliseconds):
566
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
567
 
    
568
 
    # Start - method
569
 
    Start = dbus.service.method(_interface)(start)
570
 
    Start.__name__ = "Start"
571
 
    
572
 
    # StartChecker - method
573
 
    @dbus.service.method(_interface)
574
 
    def StartChecker(self):
575
 
        "D-Bus method"
576
 
        self.start_checker()
577
 
    
578
 
    # Stop - method
579
 
    @dbus.service.method(_interface)
580
 
    def Stop(self):
581
 
        "D-Bus method"
582
 
        self.stop()
583
 
    
584
 
    # StopChecker - method
585
 
    StopChecker = dbus.service.method(_interface)(stop_checker)
586
 
    StopChecker.__name__ = "StopChecker"
587
 
    
588
 
    del _interface
 
246
            return now < (self.last_seen + self.timeout)
589
247
 
590
248
 
591
249
def peer_certificate(session):
592
 
    "Return the peer's OpenPGP certificate as a bytestring"
593
250
    # If not an OpenPGP certificate...
594
 
    if (gnutls.library.functions
595
 
        .gnutls_certificate_type_get(session._c_object)
596
 
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
251
    if gnutls.library.functions.gnutls_certificate_type_get\
 
252
            (session._c_object) \
 
253
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
597
254
        # ...do the normal thing
598
255
        return session.peer_certificate
599
256
    list_size = ctypes.c_uint()
600
 
    cert_list = (gnutls.library.functions
601
 
                 .gnutls_certificate_get_peers
602
 
                 (session._c_object, ctypes.byref(list_size)))
 
257
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
258
        (session._c_object, ctypes.byref(list_size))
603
259
    if list_size.value == 0:
604
260
        return None
605
261
    cert = cert_list[0]
607
263
 
608
264
 
609
265
def fingerprint(openpgp):
610
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
611
 
    # New GnuTLS "datum" with the OpenPGP public key
612
 
    datum = (gnutls.library.types
613
 
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
614
 
                                         ctypes.POINTER
615
 
                                         (ctypes.c_ubyte)),
616
 
                             ctypes.c_uint(len(openpgp))))
617
266
    # New empty GnuTLS certificate
618
267
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
619
 
    (gnutls.library.functions
620
 
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
268
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
269
        (ctypes.byref(crt))
 
270
    # New GnuTLS "datum" with the OpenPGP public key
 
271
    datum = gnutls.library.types.gnutls_datum_t\
 
272
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
273
                     ctypes.POINTER(ctypes.c_ubyte)),
 
274
         ctypes.c_uint(len(openpgp)))
621
275
    # Import the OpenPGP public key into the certificate
622
 
    (gnutls.library.functions
623
 
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
624
 
                                gnutls.library.constants
625
 
                                .GNUTLS_OPENPGP_FMT_RAW))
626
 
    # Verify the self signature in the key
627
 
    crtverify = ctypes.c_uint()
628
 
    (gnutls.library.functions
629
 
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
630
 
    if crtverify.value != 0:
631
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
632
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
276
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
277
        (crt,
 
278
         ctypes.byref(datum),
 
279
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
633
280
    # New buffer for the fingerprint
634
 
    buf = ctypes.create_string_buffer(20)
635
 
    buf_len = ctypes.c_size_t()
 
281
    buffer = ctypes.create_string_buffer(20)
 
282
    buffer_length = ctypes.c_size_t()
636
283
    # Get the fingerprint from the certificate into the buffer
637
 
    (gnutls.library.functions
638
 
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
639
 
                                         ctypes.byref(buf_len)))
 
284
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
285
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
640
286
    # Deinit the certificate
641
287
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
642
288
    # Convert the buffer to a Python bytestring
643
 
    fpr = ctypes.string_at(buf, buf_len.value)
 
289
    fpr = ctypes.string_at(buffer, buffer_length.value)
644
290
    # Convert the bytestring to hexadecimal notation
645
291
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
646
292
    return hex_fpr
647
293
 
648
294
 
649
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
295
class tcp_handler(SocketServer.BaseRequestHandler, object):
650
296
    """A TCP request handler class.
651
297
    Instantiated by IPv6_TCPServer for each request to handle it.
652
298
    Note: This will run in its own forked process."""
653
299
    
654
300
    def handle(self):
655
 
        logger.info(u"TCP connection from: %s",
656
 
                    unicode(self.client_address))
657
 
        session = (gnutls.connection
658
 
                   .ClientSession(self.request,
659
 
                                  gnutls.connection
660
 
                                  .X509Credentials()))
661
 
        
662
 
        line = self.request.makefile().readline()
663
 
        logger.debug(u"Protocol version: %r", line)
664
 
        try:
665
 
            if int(line.strip().split()[0]) > 1:
666
 
                raise RuntimeError
667
 
        except (ValueError, IndexError, RuntimeError), error:
668
 
            logger.error(u"Unknown protocol version: %s", error)
669
 
            return
670
 
        
671
 
        # Note: gnutls.connection.X509Credentials is really a generic
672
 
        # GnuTLS certificate credentials object so long as no X.509
673
 
        # keys are added to it.  Therefore, we can use it here despite
674
 
        # using OpenPGP certificates.
 
301
        if debug:
 
302
            sys.stderr.write(u"TCP request came\n")
 
303
            sys.stderr.write(u"Request: %s\n" % self.request)
 
304
            sys.stderr.write(u"Client Address: %s\n"
 
305
                             % unicode(self.client_address))
 
306
            sys.stderr.write(u"Server: %s\n" % self.server)
 
307
        session = gnutls.connection.ClientSession(self.request,
 
308
                                                  gnutls.connection.\
 
309
                                                  X509Credentials())
675
310
        
676
311
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
677
312
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
678
313
        #                "+DHE-DSS"))
679
 
        # Use a fallback default, since this MUST be set.
680
 
        priority = self.server.settings.get("priority", "NORMAL")
681
 
        (gnutls.library.functions
682
 
         .gnutls_priority_set_direct(session._c_object,
683
 
                                     priority, None))
 
314
        priority = "SECURE256"
 
315
        
 
316
        gnutls.library.functions.gnutls_priority_set_direct\
 
317
            (session._c_object, priority, None);
684
318
        
685
319
        try:
686
320
            session.handshake()
687
321
        except gnutls.errors.GNUTLSError, error:
688
 
            logger.warning(u"Handshake failed: %s", error)
 
322
            if debug:
 
323
                sys.stderr.write(u"Handshake failed: %s\n" % error)
689
324
            # Do not run session.bye() here: the session is not
690
325
            # established.  Just abandon the request.
691
326
            return
692
327
        try:
693
328
            fpr = fingerprint(peer_certificate(session))
694
329
        except (TypeError, gnutls.errors.GNUTLSError), error:
695
 
            logger.warning(u"Bad certificate: %s", error)
 
330
            if debug:
 
331
                sys.stderr.write(u"Bad certificate: %s\n" % error)
696
332
            session.bye()
697
333
            return
698
 
        logger.debug(u"Fingerprint: %s", fpr)
699
 
        for c in self.server.clients:
 
334
        if debug:
 
335
            sys.stderr.write(u"Fingerprint: %s\n" % fpr)
 
336
        client = None
 
337
        for c in clients:
700
338
            if c.fingerprint == fpr:
701
339
                client = c
702
340
                break
703
 
        else:
704
 
            logger.warning(u"Client not found for fingerprint: %s",
705
 
                           fpr)
706
 
            session.bye()
707
 
            return
708
341
        # Have to check if client.still_valid(), since it is possible
709
342
        # that the client timed out while establishing the GnuTLS
710
343
        # session.
711
 
        if not client.still_valid():
712
 
            logger.warning(u"Client %(name)s is invalid",
713
 
                           vars(client))
 
344
        if (not client) or (not client.still_valid()):
 
345
            if debug:
 
346
                if client:
 
347
                    sys.stderr.write(u"Client %(name)s is invalid\n"
 
348
                                     % vars(client))
 
349
                else:
 
350
                    sys.stderr.write(u"Client not found for "
 
351
                                     u"fingerprint: %s\n" % fpr)
714
352
            session.bye()
715
353
            return
716
 
        ## This won't work here, since we're in a fork.
717
 
        # client.bump_timeout()
718
354
        sent_size = 0
719
355
        while sent_size < len(client.secret):
720
356
            sent = session.send(client.secret[sent_size:])
721
 
            logger.debug(u"Sent: %d, remaining: %d",
722
 
                         sent, len(client.secret)
723
 
                         - (sent_size + sent))
 
357
            if debug:
 
358
                sys.stderr.write(u"Sent: %d, remaining: %d\n"
 
359
                                 % (sent, len(client.secret)
 
360
                                    - (sent_size + sent)))
724
361
            sent_size += sent
725
362
        session.bye()
726
363
 
727
364
 
728
 
class IPv6_TCPServer(SocketServer.ForkingMixIn,
729
 
                     SocketServer.TCPServer, object):
 
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
730
366
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
731
367
    Attributes:
732
 
        settings:       Server settings
 
368
        options:        Command line options
733
369
        clients:        Set() of Client objects
734
 
        enabled:        Boolean; whether this server is activated yet
735
370
    """
736
371
    address_family = socket.AF_INET6
737
372
    def __init__(self, *args, **kwargs):
738
 
        if "settings" in kwargs:
739
 
            self.settings = kwargs["settings"]
740
 
            del kwargs["settings"]
 
373
        if "options" in kwargs:
 
374
            self.options = kwargs["options"]
 
375
            del kwargs["options"]
741
376
        if "clients" in kwargs:
742
377
            self.clients = kwargs["clients"]
743
378
            del kwargs["clients"]
744
 
        self.enabled = False
745
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
379
        return super(type(self), self).__init__(*args, **kwargs)
746
380
    def server_bind(self):
747
381
        """This overrides the normal server_bind() function
748
382
        to bind to an interface if one was specified, and also NOT to
749
383
        bind to an address or port if they were not specified."""
750
 
        if self.settings["interface"]:
751
 
            # 25 is from /usr/include/asm-i486/socket.h
752
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
384
        if self.options.interface:
 
385
            if not hasattr(socket, "SO_BINDTODEVICE"):
 
386
                # From /usr/include/asm-i486/socket.h
 
387
                socket.SO_BINDTODEVICE = 25
753
388
            try:
754
389
                self.socket.setsockopt(socket.SOL_SOCKET,
755
 
                                       SO_BINDTODEVICE,
756
 
                                       self.settings["interface"])
 
390
                                       socket.SO_BINDTODEVICE,
 
391
                                       self.options.interface)
757
392
            except socket.error, error:
758
393
                if error[0] == errno.EPERM:
759
 
                    logger.error(u"No permission to"
760
 
                                 u" bind to interface %s",
761
 
                                 self.settings["interface"])
 
394
                    sys.stderr.write(u"Warning: No permission to" \
 
395
                                     u" bind to interface %s\n"
 
396
                                     % self.options.interface)
762
397
                else:
763
398
                    raise error
764
399
        # Only bind(2) the socket if we really need to.
767
402
                in6addr_any = "::"
768
403
                self.server_address = (in6addr_any,
769
404
                                       self.server_address[1])
770
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
771
406
                self.server_address = (self.server_address[0],
772
407
                                       0)
773
 
#                 if self.settings["interface"]:
774
 
#                     self.server_address = (self.server_address[0],
775
 
#                                            0, # port
776
 
#                                            0, # flowinfo
777
 
#                                            if_nametoindex
778
 
#                                            (self.settings
779
 
#                                             ["interface"]))
780
 
            return super(IPv6_TCPServer, self).server_bind()
781
 
    def server_activate(self):
782
 
        if self.enabled:
783
 
            return super(IPv6_TCPServer, self).server_activate()
784
 
    def enable(self):
785
 
        self.enabled = True
 
408
            return super(type(self), self).server_bind()
786
409
 
787
410
 
788
411
def string_to_delta(interval):
798
421
    datetime.timedelta(1)
799
422
    >>> string_to_delta(u'1w')
800
423
    datetime.timedelta(7)
801
 
    >>> string_to_delta('5m 30s')
802
 
    datetime.timedelta(0, 330)
803
424
    """
804
 
    timevalue = datetime.timedelta(0)
805
 
    for s in interval.split():
806
 
        try:
807
 
            suffix = unicode(s[-1])
808
 
            value = int(s[:-1])
809
 
            if suffix == u"d":
810
 
                delta = datetime.timedelta(value)
811
 
            elif suffix == u"s":
812
 
                delta = datetime.timedelta(0, value)
813
 
            elif suffix == u"m":
814
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
815
 
            elif suffix == u"h":
816
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
817
 
            elif suffix == u"w":
818
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
819
 
            else:
820
 
                raise ValueError
821
 
        except (ValueError, IndexError):
 
425
    try:
 
426
        suffix=unicode(interval[-1])
 
427
        value=int(interval[:-1])
 
428
        if suffix == u"d":
 
429
            delta = datetime.timedelta(value)
 
430
        elif suffix == u"s":
 
431
            delta = datetime.timedelta(0, value)
 
432
        elif suffix == u"m":
 
433
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
434
        elif suffix == u"h":
 
435
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
436
        elif suffix == u"w":
 
437
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
438
        else:
822
439
            raise ValueError
823
 
        timevalue += delta
824
 
    return timevalue
 
440
    except (ValueError, IndexError):
 
441
        raise ValueError
 
442
    return delta
 
443
 
 
444
 
 
445
def add_service():
 
446
    """From the Avahi server example code"""
 
447
    global group, serviceName, serviceType, servicePort, serviceTXT, \
 
448
           domain, host
 
449
    if group is None:
 
450
        group = dbus.Interface(
 
451
                bus.get_object( avahi.DBUS_NAME,
 
452
                                server.EntryGroupNew()),
 
453
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
454
        group.connect_to_signal('StateChanged',
 
455
                                entry_group_state_changed)
 
456
    if debug:
 
457
        sys.stderr.write(u"Adding service '%s' of type '%s' ...\n"
 
458
                         % (serviceName, serviceType))
 
459
    
 
460
    group.AddService(
 
461
            serviceInterface,           # interface
 
462
            avahi.PROTO_INET6,          # protocol
 
463
            dbus.UInt32(0),             # flags
 
464
            serviceName, serviceType,
 
465
            domain, host,
 
466
            dbus.UInt16(servicePort),
 
467
            avahi.string_array_to_txt_array(serviceTXT))
 
468
    group.Commit()
 
469
 
 
470
 
 
471
def remove_service():
 
472
    """From the Avahi server example code"""
 
473
    global group
 
474
    
 
475
    if not group is None:
 
476
        group.Reset()
825
477
 
826
478
 
827
479
def server_state_changed(state):
828
 
    """Derived from the Avahi example code"""
 
480
    """From the Avahi server example code"""
829
481
    if state == avahi.SERVER_COLLISION:
830
 
        logger.error(u"Zeroconf server name collision")
831
 
        service.remove()
 
482
        sys.stderr.write(u"WARNING: Server name collision\n")
 
483
        remove_service()
832
484
    elif state == avahi.SERVER_RUNNING:
833
 
        service.add()
 
485
        add_service()
834
486
 
835
487
 
836
488
def entry_group_state_changed(state, error):
837
 
    """Derived from the Avahi example code"""
838
 
    logger.debug(u"Avahi state change: %i", state)
 
489
    """From the Avahi server example code"""
 
490
    global serviceName, server, rename_count
 
491
    
 
492
    if debug:
 
493
        sys.stderr.write(u"state change: %i\n" % state)
839
494
    
840
495
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
841
 
        logger.debug(u"Zeroconf service established.")
 
496
        if debug:
 
497
            sys.stderr.write(u"Service established.\n")
842
498
    elif state == avahi.ENTRY_GROUP_COLLISION:
843
 
        logger.warning(u"Zeroconf service name collision.")
844
 
        service.rename()
 
499
        
 
500
        rename_count = rename_count - 1
 
501
        if rename_count > 0:
 
502
            name = server.GetAlternativeServiceName(name)
 
503
            sys.stderr.write(u"WARNING: Service name collision, "
 
504
                             u"changing name to '%s' ...\n" % name)
 
505
            remove_service()
 
506
            add_service()
 
507
            
 
508
        else:
 
509
            sys.stderr.write(u"ERROR: No suitable service name found "
 
510
                             u"after %i retries, exiting.\n"
 
511
                             % n_rename)
 
512
            main_loop.quit()
845
513
    elif state == avahi.ENTRY_GROUP_FAILURE:
846
 
        logger.critical(u"Avahi: Error in group state changed %s",
847
 
                        unicode(error))
848
 
        raise AvahiGroupError("State changed: %s", str(error))
 
514
        sys.stderr.write(u"Error in group state changed %s\n"
 
515
                         % unicode(error))
 
516
        main_loop.quit()
 
517
        return
 
518
 
849
519
 
850
520
def if_nametoindex(interface):
851
 
    """Call the C function if_nametoindex(), or equivalent"""
852
 
    global if_nametoindex
 
521
    """Call the C function if_nametoindex()"""
853
522
    try:
854
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
855
 
                          (ctypes.util.find_library("c"))
856
 
                          .if_nametoindex)
 
523
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
524
        return libc.if_nametoindex(interface)
857
525
    except (OSError, AttributeError):
858
526
        if "struct" not in sys.modules:
859
527
            import struct
860
528
        if "fcntl" not in sys.modules:
861
529
            import fcntl
862
 
        def if_nametoindex(interface):
863
 
            "Get an interface index the hard way, i.e. using fcntl()"
864
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
865
 
            with closing(socket.socket()) as s:
866
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
867
 
                                    struct.pack("16s16x", interface))
868
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
869
 
            return interface_index
870
 
    return if_nametoindex(interface)
871
 
 
872
 
 
873
 
def daemon(nochdir = False, noclose = False):
874
 
    """See daemon(3).  Standard BSD Unix function.
875
 
    This should really exist as os.daemon, but it doesn't (yet)."""
876
 
    if os.fork():
877
 
        sys.exit()
878
 
    os.setsid()
879
 
    if not nochdir:
880
 
        os.chdir("/")
881
 
    if os.fork():
882
 
        sys.exit()
883
 
    if not noclose:
884
 
        # Close all standard open file descriptors
885
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
886
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
887
 
            raise OSError(errno.ENODEV,
888
 
                          "/dev/null not a character device")
889
 
        os.dup2(null, sys.stdin.fileno())
890
 
        os.dup2(null, sys.stdout.fileno())
891
 
        os.dup2(null, sys.stderr.fileno())
892
 
        if null > 2:
893
 
            os.close(null)
894
 
 
895
 
 
896
 
def main():
897
 
    parser = OptionParser(version = "%%prog %s" % version)
 
530
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
531
        s = socket.socket()
 
532
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
533
                            struct.pack("16s16x", interface))
 
534
        s.close()
 
535
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
536
        return interface_index
 
537
 
 
538
 
 
539
if __name__ == '__main__':
 
540
    parser = OptionParser()
898
541
    parser.add_option("-i", "--interface", type="string",
899
 
                      metavar="IF", help="Bind to interface IF")
900
 
    parser.add_option("-a", "--address", type="string",
901
 
                      help="Address to listen for requests on")
902
 
    parser.add_option("-p", "--port", type="int",
 
542
                      default=None, metavar="IF",
 
543
                      help="Bind to interface IF")
 
544
    parser.add_option("--cert", type="string", default="cert.pem",
 
545
                      metavar="FILE",
 
546
                      help="Public key certificate PEM file to use")
 
547
    parser.add_option("--key", type="string", default="key.pem",
 
548
                      metavar="FILE",
 
549
                      help="Private key PEM file to use")
 
550
    parser.add_option("--ca", type="string", default="ca.pem",
 
551
                      metavar="FILE",
 
552
                      help="Certificate Authority certificate PEM file to use")
 
553
    parser.add_option("--crl", type="string", default="crl.pem",
 
554
                      metavar="FILE",
 
555
                      help="Certificate Revokation List PEM file to use")
 
556
    parser.add_option("-p", "--port", type="int", default=None,
903
557
                      help="Port number to receive requests on")
 
558
    parser.add_option("--timeout", type="string", # Parsed later
 
559
                      default="1h",
 
560
                      help="Amount of downtime allowed for clients")
 
561
    parser.add_option("--interval", type="string", # Parsed later
 
562
                      default="5m",
 
563
                      help="How often to check that a client is up")
904
564
    parser.add_option("--check", action="store_true", default=False,
905
565
                      help="Run self-test")
906
 
    parser.add_option("--debug", action="store_true",
907
 
                      help="Debug mode; run in foreground and log to"
908
 
                      " terminal")
909
 
    parser.add_option("--priority", type="string", help="GnuTLS"
910
 
                      " priority string (see GnuTLS documentation)")
911
 
    parser.add_option("--servicename", type="string", metavar="NAME",
912
 
                      help="Zeroconf service name")
913
 
    parser.add_option("--configdir", type="string",
914
 
                      default="/etc/mandos", metavar="DIR",
915
 
                      help="Directory to search for configuration"
916
 
                      " files")
917
 
    options = parser.parse_args()[0]
 
566
    parser.add_option("--debug", action="store_true", default=False,
 
567
                      help="Debug mode")
 
568
    (options, args) = parser.parse_args()
918
569
    
919
570
    if options.check:
920
571
        import doctest
921
572
        doctest.testmod()
922
573
        sys.exit()
923
574
    
924
 
    # Default values for config file for server-global settings
925
 
    server_defaults = { "interface": "",
926
 
                        "address": "",
927
 
                        "port": "",
928
 
                        "debug": "False",
929
 
                        "priority":
930
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
931
 
                        "servicename": "Mandos",
932
 
                        }
933
 
    
934
 
    # Parse config file for server-global settings
935
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
936
 
    del server_defaults
937
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
938
 
    # Convert the SafeConfigParser object to a dict
939
 
    server_settings = server_config.defaults()
940
 
    # Use getboolean on the boolean config option
941
 
    server_settings["debug"] = (server_config.getboolean
942
 
                                ("DEFAULT", "debug"))
943
 
    del server_config
944
 
    
945
 
    # Override the settings from the config file with command line
946
 
    # options, if set.
947
 
    for option in ("interface", "address", "port", "debug",
948
 
                   "priority", "servicename", "configdir"):
949
 
        value = getattr(options, option)
950
 
        if value is not None:
951
 
            server_settings[option] = value
952
 
    del options
953
 
    # Now we have our good server settings in "server_settings"
954
 
    
955
 
    debug = server_settings["debug"]
956
 
    
957
 
    if not debug:
958
 
        syslogger.setLevel(logging.WARNING)
959
 
        console.setLevel(logging.WARNING)
960
 
    
961
 
    if server_settings["servicename"] != "Mandos":
962
 
        syslogger.setFormatter(logging.Formatter
963
 
                               ('Mandos (%s): %%(levelname)s:'
964
 
                                ' %%(message)s'
965
 
                                % server_settings["servicename"]))
966
 
    
967
 
    # Parse config file with clients
968
 
    client_defaults = { "timeout": "1h",
969
 
                        "interval": "5m",
970
 
                        "checker": "fping -q -- %(host)s",
971
 
                        "host": "",
972
 
                        }
973
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
974
 
    client_config.read(os.path.join(server_settings["configdir"],
975
 
                                    "clients.conf"))
976
 
    
977
 
    clients = Set()
978
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
979
 
                                 server_settings["port"]),
980
 
                                TCP_handler,
981
 
                                settings=server_settings,
982
 
                                clients=clients)
983
 
    pidfilename = "/var/run/mandos.pid"
984
 
    try:
985
 
        pidfile = open(pidfilename, "w")
986
 
    except IOError, error:
987
 
        logger.error("Could not open file %r", pidfilename)
988
 
    
989
 
    try:
990
 
        uid = pwd.getpwnam("_mandos").pw_uid
991
 
    except KeyError:
992
 
        try:
993
 
            uid = pwd.getpwnam("mandos").pw_uid
994
 
        except KeyError:
995
 
            try:
996
 
                uid = pwd.getpwnam("nobody").pw_uid
997
 
            except KeyError:
998
 
                uid = 65534
999
 
    try:
1000
 
        gid = pwd.getpwnam("_mandos").pw_gid
1001
 
    except KeyError:
1002
 
        try:
1003
 
            gid = pwd.getpwnam("mandos").pw_gid
1004
 
        except KeyError:
1005
 
            try:
1006
 
                gid = pwd.getpwnam("nogroup").pw_gid
1007
 
            except KeyError:
1008
 
                gid = 65534
1009
 
    try:
1010
 
        os.setuid(uid)
1011
 
        os.setgid(gid)
1012
 
    except OSError, error:
1013
 
        if error[0] != errno.EPERM:
1014
 
            raise error
1015
 
    
1016
 
    global service
1017
 
    service = AvahiService(name = server_settings["servicename"],
1018
 
                           servicetype = "_mandos._tcp", )
1019
 
    if server_settings["interface"]:
1020
 
        service.interface = (if_nametoindex
1021
 
                             (server_settings["interface"]))
1022
 
    
1023
 
    global main_loop
1024
 
    global bus
1025
 
    global server
1026
 
    # From the Avahi example code
 
575
    # Parse the time arguments
 
576
    try:
 
577
        options.timeout = string_to_delta(options.timeout)
 
578
    except ValueError:
 
579
        parser.error("option --timeout: Unparseable time")
 
580
    try:
 
581
        options.interval = string_to_delta(options.interval)
 
582
    except ValueError:
 
583
        parser.error("option --interval: Unparseable time")
 
584
    
 
585
    # Parse config file
 
586
    defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
 
587
    client_config = ConfigParser.SafeConfigParser(defaults)
 
588
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
 
589
    client_config.read("mandos-clients.conf")
 
590
    
 
591
    # From the Avahi server example code
1027
592
    DBusGMainLoop(set_as_default=True )
1028
593
    main_loop = gobject.MainLoop()
1029
594
    bus = dbus.SystemBus()
1030
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1031
 
                                           avahi.DBUS_PATH_SERVER),
1032
 
                            avahi.DBUS_INTERFACE_SERVER)
 
595
    server = dbus.Interface(
 
596
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
597
            avahi.DBUS_INTERFACE_SERVER )
1033
598
    # End of Avahi example code
1034
 
    bus_name = dbus.service.BusName(u"org.mandos-system.Mandos", bus)
1035
 
    
1036
 
    clients.update(Set(Client(name = section,
1037
 
                              config
1038
 
                              = dict(client_config.items(section)))
 
599
    
 
600
    debug = options.debug
 
601
    
 
602
    clients = Set()
 
603
    def remove_from_clients(client):
 
604
        clients.remove(client)
 
605
        if not clients:
 
606
            if debug:
 
607
                sys.stderr.write(u"No clients left, exiting\n")
 
608
            main_loop.quit()
 
609
    
 
610
    clients.update(Set(Client(name=section, options=options,
 
611
                              stop_hook = remove_from_clients,
 
612
                              **(dict(client_config\
 
613
                                      .items(section))))
1039
614
                       for section in client_config.sections()))
1040
 
    if not clients:
1041
 
        logger.critical(u"No clients defined")
1042
 
        sys.exit(1)
1043
 
    
1044
 
    if debug:
1045
 
        # Redirect stdin so all checkers get /dev/null
1046
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1047
 
        os.dup2(null, sys.stdin.fileno())
1048
 
        if null > 2:
1049
 
            os.close(null)
1050
 
    else:
1051
 
        # No console logging
1052
 
        logger.removeHandler(console)
1053
 
        # Close all input and output, do double fork, etc.
1054
 
        daemon()
1055
 
    
1056
 
    try:
1057
 
        pid = os.getpid()
1058
 
        pidfile.write(str(pid) + "\n")
1059
 
        pidfile.close()
1060
 
        del pidfile
1061
 
    except IOError:
1062
 
        logger.error(u"Could not write to file %r with PID %d",
1063
 
                     pidfilename, pid)
1064
 
    except NameError:
1065
 
        # "pidfile" was never created
1066
 
        pass
1067
 
    del pidfilename
1068
 
    
1069
 
    def cleanup():
1070
 
        "Cleanup function; run on exit"
1071
 
        global group
1072
 
        # From the Avahi example code
1073
 
        if not group is None:
1074
 
            group.Free()
1075
 
            group = None
1076
 
        # End of Avahi example code
1077
 
        
1078
 
        while clients:
1079
 
            client = clients.pop()
1080
 
            client.stop_hook = None
1081
 
            client.stop()
1082
 
    
1083
 
    atexit.register(cleanup)
1084
 
    
1085
 
    if not debug:
1086
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1087
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1088
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1089
 
    
1090
 
    class MandosServer(dbus.service.Object):
1091
 
        """A D-Bus proxy object"""
1092
 
        def __init__(self):
1093
 
            dbus.service.Object.__init__(self, bus,
1094
 
                                         "/Mandos")
1095
 
        _interface = u"org.mandos_system.Mandos"
1096
 
        
1097
 
        @dbus.service.signal(_interface, signature="oa{sv}")
1098
 
        def ClientAdded(self, objpath, properties):
1099
 
            "D-Bus signal"
1100
 
            pass
1101
 
        
1102
 
        @dbus.service.signal(_interface, signature="o")
1103
 
        def ClientRemoved(self, objpath):
1104
 
            "D-Bus signal"
1105
 
            pass
1106
 
        
1107
 
        @dbus.service.method(_interface, out_signature="ao")
1108
 
        def GetAllClients(self):
1109
 
            return dbus.Array(c.dbus_object_path for c in clients)
1110
 
        
1111
 
        @dbus.service.method(_interface, out_signature="a{oa{sv}}")
1112
 
        def GetAllClientsWithProperties(self):
1113
 
            return dbus.Dictionary(
1114
 
                ((c.dbus_object_path, c.GetAllProperties())
1115
 
                 for c in clients),
1116
 
                signature="oa{sv}")
1117
 
        
1118
 
        @dbus.service.method(_interface, in_signature="o")
1119
 
        def RemoveClient(self, object_path):
1120
 
            for c in clients:
1121
 
                if c.dbus_object_path == object_path:
1122
 
                    c.stop()
1123
 
                    clients.remove(c)
1124
 
                    return
1125
 
            raise KeyError
1126
 
        
1127
 
        del _interface
1128
 
    
1129
 
    mandos_server = MandosServer()
1130
 
    
1131
615
    for client in clients:
1132
 
        # Emit D-Bus signal
1133
 
        mandos_server.ClientAdded(client.dbus_object_path,
1134
 
                                  client.GetAllProperties())
1135
616
        client.start()
1136
617
    
1137
 
    tcp_server.enable()
1138
 
    tcp_server.server_activate()
1139
 
    
1140
 
    # Find out what port we got
1141
 
    service.port = tcp_server.socket.getsockname()[1]
1142
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
1143
 
                u" scope_id %d" % tcp_server.socket.getsockname())
1144
 
    
1145
 
    #service.interface = tcp_server.socket.getsockname()[3]
1146
 
    
 
618
    tcp_server = IPv6_TCPServer((None, options.port),
 
619
                                tcp_handler,
 
620
                                options=options,
 
621
                                clients=clients)
 
622
    # Find out what random port we got
 
623
    servicePort = tcp_server.socket.getsockname()[1]
 
624
    if debug:
 
625
        sys.stderr.write(u"Now listening on port %d\n" % servicePort)
 
626
    
 
627
    if options.interface is not None:
 
628
        serviceInterface = if_nametoindex(options.interface)
 
629
    
 
630
    # From the Avahi server example code
 
631
    server.connect_to_signal("StateChanged", server_state_changed)
 
632
    server_state_changed(server.GetState())
 
633
    # End of Avahi example code
 
634
    
 
635
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
636
                         lambda *args, **kwargs:
 
637
                         tcp_server.handle_request(*args[2:],
 
638
                                                   **kwargs) or True)
1147
639
    try:
1148
 
        # From the Avahi example code
1149
 
        server.connect_to_signal("StateChanged", server_state_changed)
1150
 
        try:
1151
 
            server_state_changed(server.GetState())
1152
 
        except dbus.exceptions.DBusException, error:
1153
 
            logger.critical(u"DBusException: %s", error)
1154
 
            sys.exit(1)
1155
 
        # End of Avahi example code
1156
 
        
1157
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1158
 
                             lambda *args, **kwargs:
1159
 
                             (tcp_server.handle_request
1160
 
                              (*args[2:], **kwargs) or True))
1161
 
        
1162
 
        logger.debug(u"Starting main loop")
1163
640
        main_loop.run()
1164
 
    except AvahiError, error:
1165
 
        logger.critical(u"AvahiError: %s" + unicode(error))
1166
 
        sys.exit(1)
1167
641
    except KeyboardInterrupt:
1168
 
        if debug:
1169
 
            print
 
642
        print
 
643
    
 
644
    # Cleanup here
1170
645
 
1171
 
if __name__ == '__main__':
1172
 
    main()
 
646
    # From the Avahi server example code
 
647
    if not group is None:
 
648
        group.Free()
 
649
    # End of Avahi example code
 
650
    
 
651
    for client in clients:
 
652
        client.stop_hook = None
 
653
        client.stop()