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mandos
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 © 2008,2009 Teddy Hogeborn
 
15
# Copyright © 2008,2009 Björn Påhlsson
 
16
# 
 
17
# This program is free software: you can redistribute it and/or modify
 
18
# it under the terms of the GNU General Public License as published by
 
19
# the Free Software Foundation, either version 3 of the License, or
 
20
# (at your option) any later version.
 
21
#
 
22
#     This program is distributed in the hope that it will be useful,
 
23
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
 
24
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
25
#     GNU General Public License for more details.
 
26
# 
 
27
# You should have received a copy of the GNU General Public License
 
28
# along with this program.  If not, see
 
29
# <http://www.gnu.org/licenses/>.
 
30
# 
 
31
# Contact the authors at <mandos@fukt.bsnet.se>.
 
32
# 
 
33
 
 
34
from __future__ import division, with_statement, absolute_import
2
35
 
3
36
import SocketServer
4
37
import socket
5
 
import select
6
 
from optparse import OptionParser
 
38
import optparse
7
39
import datetime
8
40
import errno
9
41
import gnutls.crypto
10
42
import gnutls.connection
11
43
import gnutls.errors
 
44
import gnutls.library.functions
 
45
import gnutls.library.constants
 
46
import gnutls.library.types
12
47
import ConfigParser
13
48
import sys
14
 
 
15
 
 
16
 
class Client(object):
17
 
    def __init__(self, name=None, options=None, dn=None,
18
 
                 password=None, passfile=None, fqdn=None,
19
 
                 timeout=None, interval=-1):
20
 
        self.name = name
21
 
        self.dn = dn
22
 
        if password:
23
 
            self.password = password
24
 
        elif passfile:
25
 
            self.password = open(passfile).readall()
26
 
        else:
27
 
            print "No Password or Passfile in client config file"
28
 
            # raise RuntimeError XXX
29
 
            self.password = "gazonk"
30
 
        self.fqdn = fqdn
31
 
        self.created = datetime.datetime.now()
32
 
        self.last_seen = None
33
 
        if timeout is None:
34
 
            timeout = options.timeout
35
 
        self.timeout = timeout
36
 
        if interval == -1:
37
 
            interval = options.interval
38
 
        self.interval = interval
39
 
        self.next_check = datetime.datetime.now()
40
 
 
41
 
 
42
 
class server_metaclass(type):
43
 
    "Common behavior for the UDP and TCP server classes"
44
 
    def __new__(cls, name, bases, attrs):
45
 
        attrs["address_family"] = socket.AF_INET6
46
 
        attrs["allow_reuse_address"] = True
47
 
        def server_bind(self):
48
 
            if self.options.interface:
49
 
                if not hasattr(socket, "SO_BINDTODEVICE"):
50
 
                    # From /usr/include/asm-i486/socket.h
51
 
                    socket.SO_BINDTODEVICE = 25
 
49
import re
 
50
import os
 
51
import signal
 
52
from sets import Set
 
53
import subprocess
 
54
import atexit
 
55
import stat
 
56
import logging
 
57
import logging.handlers
 
58
import pwd
 
59
from contextlib import closing
 
60
 
 
61
import dbus
 
62
import dbus.service
 
63
import gobject
 
64
import avahi
 
65
from dbus.mainloop.glib import DBusGMainLoop
 
66
import ctypes
 
67
import ctypes.util
 
68
 
 
69
version = "1.0.9"
 
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 [%(process)d]: %(levelname)s:'
 
77
                        ' %(message)s'))
 
78
logger.addHandler(syslogger)
 
79
 
 
80
console = logging.StreamHandler()
 
81
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
 
82
                                       ' %(levelname)s: %(message)s'))
 
83
logger.addHandler(console)
 
84
 
 
85
class AvahiError(Exception):
 
86
    def __init__(self, value, *args, **kwargs):
 
87
        self.value = value
 
88
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
89
    def __unicode__(self):
 
90
        return unicode(repr(self.value))
 
91
 
 
92
class AvahiServiceError(AvahiError):
 
93
    pass
 
94
 
 
95
class AvahiGroupError(AvahiError):
 
96
    pass
 
97
 
 
98
 
 
99
class AvahiService(object):
 
100
    """An Avahi (Zeroconf) service.
 
101
    Attributes:
 
102
    interface: integer; avahi.IF_UNSPEC or an interface index.
 
103
               Used to optionally bind to the specified interface.
 
104
    name: string; Example: 'Mandos'
 
105
    type: string; Example: '_mandos._tcp'.
 
106
                  See <http://www.dns-sd.org/ServiceTypes.html>
 
107
    port: integer; what port to announce
 
108
    TXT: list of strings; TXT record for the service
 
109
    domain: string; Domain to publish on, default to .local if empty.
 
110
    host: string; Host to publish records for, default is localhost
 
111
    max_renames: integer; maximum number of renames
 
112
    rename_count: integer; counter so we only rename after collisions
 
113
                  a sensible number of times
 
114
    """
 
115
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
 
116
                 servicetype = None, port = None, TXT = None,
 
117
                 domain = "", host = "", max_renames = 32768,
 
118
                 protocol = avahi.PROTO_UNSPEC):
 
119
        self.interface = interface
 
120
        self.name = name
 
121
        self.type = servicetype
 
122
        self.port = port
 
123
        self.TXT = TXT if TXT is not None else []
 
124
        self.domain = domain
 
125
        self.host = host
 
126
        self.rename_count = 0
 
127
        self.max_renames = max_renames
 
128
        self.protocol = protocol
 
129
    def rename(self):
 
130
        """Derived from the Avahi example code"""
 
131
        if self.rename_count >= self.max_renames:
 
132
            logger.critical(u"No suitable Zeroconf service name found"
 
133
                            u" after %i retries, exiting.",
 
134
                            self.rename_count)
 
135
            raise AvahiServiceError(u"Too many renames")
 
136
        self.name = server.GetAlternativeServiceName(self.name)
 
137
        logger.info(u"Changing Zeroconf service name to %r ...",
 
138
                    str(self.name))
 
139
        syslogger.setFormatter(logging.Formatter
 
140
                               ('Mandos (%s): %%(levelname)s:'
 
141
                                ' %%(message)s' % self.name))
 
142
        self.remove()
 
143
        self.add()
 
144
        self.rename_count += 1
 
145
    def remove(self):
 
146
        """Derived from the Avahi example code"""
 
147
        if group is not None:
 
148
            group.Reset()
 
149
    def add(self):
 
150
        """Derived from the Avahi example code"""
 
151
        global group
 
152
        if group is None:
 
153
            group = dbus.Interface(bus.get_object
 
154
                                   (avahi.DBUS_NAME,
 
155
                                    server.EntryGroupNew()),
 
156
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
157
            group.connect_to_signal('StateChanged',
 
158
                                    entry_group_state_changed)
 
159
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
160
                     service.name, service.type)
 
161
        group.AddService(
 
162
                self.interface,         # interface
 
163
                self.protocol,          # protocol
 
164
                dbus.UInt32(0),         # flags
 
165
                self.name, self.type,
 
166
                self.domain, self.host,
 
167
                dbus.UInt16(self.port),
 
168
                avahi.string_array_to_txt_array(self.TXT))
 
169
        group.Commit()
 
170
 
 
171
# From the Avahi example code:
 
172
group = None                            # our entry group
 
173
# End of Avahi example code
 
174
 
 
175
 
 
176
def _datetime_to_dbus(dt, variant_level=0):
 
177
    """Convert a UTC datetime.datetime() to a D-Bus type."""
 
178
    return dbus.String(dt.isoformat(), variant_level=variant_level)
 
179
 
 
180
 
 
181
class Client(dbus.service.Object):
 
182
    """A representation of a client host served by this server.
 
183
    Attributes:
 
184
    name:       string; from the config file, used in log messages and
 
185
                        D-Bus identifiers
 
186
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
187
                 uniquely identify the client
 
188
    secret:     bytestring; sent verbatim (over TLS) to client
 
189
    host:       string; available for use by the checker command
 
190
    created:    datetime.datetime(); (UTC) object creation
 
191
    last_enabled: datetime.datetime(); (UTC)
 
192
    enabled:    bool()
 
193
    last_checked_ok: datetime.datetime(); (UTC) or None
 
194
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
195
                                      until this client is invalid
 
196
    interval:   datetime.timedelta(); How often to start a new checker
 
197
    disable_hook:  If set, called by disable() as disable_hook(self)
 
198
    checker:    subprocess.Popen(); a running checker process used
 
199
                                    to see if the client lives.
 
200
                                    'None' if no process is running.
 
201
    checker_initiator_tag: a gobject event source tag, or None
 
202
    disable_initiator_tag:    - '' -
 
203
    checker_callback_tag:  - '' -
 
204
    checker_command: string; External command which is run to check if
 
205
                     client lives.  %() expansions are done at
 
206
                     runtime with vars(self) as dict, so that for
 
207
                     instance %(name)s can be used in the command.
 
208
    current_checker_command: string; current running checker_command
 
209
    use_dbus: bool(); Whether to provide D-Bus interface and signals
 
210
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
 
211
    """
 
212
    def timeout_milliseconds(self):
 
213
        "Return the 'timeout' attribute in milliseconds"
 
214
        return ((self.timeout.days * 24 * 60 * 60 * 1000)
 
215
                + (self.timeout.seconds * 1000)
 
216
                + (self.timeout.microseconds // 1000))
 
217
    
 
218
    def interval_milliseconds(self):
 
219
        "Return the 'interval' attribute in milliseconds"
 
220
        return ((self.interval.days * 24 * 60 * 60 * 1000)
 
221
                + (self.interval.seconds * 1000)
 
222
                + (self.interval.microseconds // 1000))
 
223
    
 
224
    def __init__(self, name = None, disable_hook=None, config=None,
 
225
                 use_dbus=True):
 
226
        """Note: the 'checker' key in 'config' sets the
 
227
        'checker_command' attribute and *not* the 'checker'
 
228
        attribute."""
 
229
        self.name = name
 
230
        if config is None:
 
231
            config = {}
 
232
        logger.debug(u"Creating client %r", self.name)
 
233
        self.use_dbus = False   # During __init__
 
234
        # Uppercase and remove spaces from fingerprint for later
 
235
        # comparison purposes with return value from the fingerprint()
 
236
        # function
 
237
        self.fingerprint = (config["fingerprint"].upper()
 
238
                            .replace(u" ", u""))
 
239
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
 
240
        if "secret" in config:
 
241
            self.secret = config["secret"].decode(u"base64")
 
242
        elif "secfile" in config:
 
243
            with closing(open(os.path.expanduser
 
244
                              (os.path.expandvars
 
245
                               (config["secfile"])))) as secfile:
 
246
                self.secret = secfile.read()
 
247
        else:
 
248
            raise TypeError(u"No secret or secfile for client %s"
 
249
                            % self.name)
 
250
        self.host = config.get("host", "")
 
251
        self.created = datetime.datetime.utcnow()
 
252
        self.enabled = False
 
253
        self.last_enabled = None
 
254
        self.last_checked_ok = None
 
255
        self.timeout = string_to_delta(config["timeout"])
 
256
        self.interval = string_to_delta(config["interval"])
 
257
        self.disable_hook = disable_hook
 
258
        self.checker = None
 
259
        self.checker_initiator_tag = None
 
260
        self.disable_initiator_tag = None
 
261
        self.checker_callback_tag = None
 
262
        self.checker_command = config["checker"]
 
263
        self.current_checker_command = None
 
264
        self.last_connect = None
 
265
        # Only now, when this client is initialized, can it show up on
 
266
        # the D-Bus
 
267
        self.use_dbus = use_dbus
 
268
        if self.use_dbus:
 
269
            self.dbus_object_path = (dbus.ObjectPath
 
270
                                     ("/clients/"
 
271
                                      + self.name.replace(".", "_")))
 
272
            dbus.service.Object.__init__(self, bus,
 
273
                                         self.dbus_object_path)
 
274
    
 
275
    def enable(self):
 
276
        """Start this client's checker and timeout hooks"""
 
277
        self.last_enabled = datetime.datetime.utcnow()
 
278
        # Schedule a new checker to be started an 'interval' from now,
 
279
        # and every interval from then on.
 
280
        self.checker_initiator_tag = (gobject.timeout_add
 
281
                                      (self.interval_milliseconds(),
 
282
                                       self.start_checker))
 
283
        # Also start a new checker *right now*.
 
284
        self.start_checker()
 
285
        # Schedule a disable() when 'timeout' has passed
 
286
        self.disable_initiator_tag = (gobject.timeout_add
 
287
                                   (self.timeout_milliseconds(),
 
288
                                    self.disable))
 
289
        self.enabled = True
 
290
        if self.use_dbus:
 
291
            # Emit D-Bus signals
 
292
            self.PropertyChanged(dbus.String(u"enabled"),
 
293
                                 dbus.Boolean(True, variant_level=1))
 
294
            self.PropertyChanged(dbus.String(u"last_enabled"),
 
295
                                 (_datetime_to_dbus(self.last_enabled,
 
296
                                                    variant_level=1)))
 
297
    
 
298
    def disable(self):
 
299
        """Disable this client."""
 
300
        if not getattr(self, "enabled", False):
 
301
            return False
 
302
        logger.info(u"Disabling client %s", self.name)
 
303
        if getattr(self, "disable_initiator_tag", False):
 
304
            gobject.source_remove(self.disable_initiator_tag)
 
305
            self.disable_initiator_tag = None
 
306
        if getattr(self, "checker_initiator_tag", False):
 
307
            gobject.source_remove(self.checker_initiator_tag)
 
308
            self.checker_initiator_tag = None
 
309
        self.stop_checker()
 
310
        if self.disable_hook:
 
311
            self.disable_hook(self)
 
312
        self.enabled = False
 
313
        if self.use_dbus:
 
314
            # Emit D-Bus signal
 
315
            self.PropertyChanged(dbus.String(u"enabled"),
 
316
                                 dbus.Boolean(False, variant_level=1))
 
317
        # Do not run this again if called by a gobject.timeout_add
 
318
        return False
 
319
    
 
320
    def __del__(self):
 
321
        self.disable_hook = None
 
322
        self.disable()
 
323
    
 
324
    def checker_callback(self, pid, condition, command):
 
325
        """The checker has completed, so take appropriate actions."""
 
326
        self.checker_callback_tag = None
 
327
        self.checker = None
 
328
        if self.use_dbus:
 
329
            # Emit D-Bus signal
 
330
            self.PropertyChanged(dbus.String(u"checker_running"),
 
331
                                 dbus.Boolean(False, variant_level=1))
 
332
        if os.WIFEXITED(condition):
 
333
            exitstatus = os.WEXITSTATUS(condition)
 
334
            if exitstatus == 0:
 
335
                logger.info(u"Checker for %(name)s succeeded",
 
336
                            vars(self))
 
337
                self.checked_ok()
 
338
            else:
 
339
                logger.info(u"Checker for %(name)s failed",
 
340
                            vars(self))
 
341
            if self.use_dbus:
 
342
                # Emit D-Bus signal
 
343
                self.CheckerCompleted(dbus.Int16(exitstatus),
 
344
                                      dbus.Int64(condition),
 
345
                                      dbus.String(command))
 
346
        else:
 
347
            logger.warning(u"Checker for %(name)s crashed?",
 
348
                           vars(self))
 
349
            if self.use_dbus:
 
350
                # Emit D-Bus signal
 
351
                self.CheckerCompleted(dbus.Int16(-1),
 
352
                                      dbus.Int64(condition),
 
353
                                      dbus.String(command))
 
354
    
 
355
    def checked_ok(self):
 
356
        """Bump up the timeout for this client.
 
357
        This should only be called when the client has been seen,
 
358
        alive and well.
 
359
        """
 
360
        self.last_checked_ok = datetime.datetime.utcnow()
 
361
        gobject.source_remove(self.disable_initiator_tag)
 
362
        self.disable_initiator_tag = (gobject.timeout_add
 
363
                                      (self.timeout_milliseconds(),
 
364
                                       self.disable))
 
365
        if self.use_dbus:
 
366
            # Emit D-Bus signal
 
367
            self.PropertyChanged(
 
368
                dbus.String(u"last_checked_ok"),
 
369
                (_datetime_to_dbus(self.last_checked_ok,
 
370
                                   variant_level=1)))
 
371
    
 
372
    def start_checker(self):
 
373
        """Start a new checker subprocess if one is not running.
 
374
        If a checker already exists, leave it running and do
 
375
        nothing."""
 
376
        # The reason for not killing a running checker is that if we
 
377
        # did that, then if a checker (for some reason) started
 
378
        # running slowly and taking more than 'interval' time, the
 
379
        # client would inevitably timeout, since no checker would get
 
380
        # a chance to run to completion.  If we instead leave running
 
381
        # checkers alone, the checker would have to take more time
 
382
        # than 'timeout' for the client to be declared invalid, which
 
383
        # is as it should be.
 
384
        
 
385
        # If a checker exists, make sure it is not a zombie
 
386
        if self.checker is not None:
 
387
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
388
            if pid:
 
389
                logger.warning("Checker was a zombie")
 
390
                gobject.source_remove(self.checker_callback_tag)
 
391
                self.checker_callback(pid, status,
 
392
                                      self.current_checker_command)
 
393
        # Start a new checker if needed
 
394
        if self.checker is None:
 
395
            try:
 
396
                # In case checker_command has exactly one % operator
 
397
                command = self.checker_command % self.host
 
398
            except TypeError:
 
399
                # Escape attributes for the shell
 
400
                escaped_attrs = dict((key, re.escape(str(val)))
 
401
                                     for key, val in
 
402
                                     vars(self).iteritems())
52
403
                try:
53
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
54
 
                                           socket.SO_BINDTODEVICE,
55
 
                                           self.options.interface)
56
 
                except socket.error, error:
57
 
                    if error[0] == errno.EPERM:
58
 
                        print "Warning: No permission to bind to interface", \
59
 
                              self.options.interface
60
 
                    else:
61
 
                        raise error
62
 
            return super(type(self), self).server_bind()
63
 
        attrs["server_bind"] = server_bind
64
 
        def init(self, *args, **kwargs):
65
 
            if "options" in kwargs:
66
 
                self.options = kwargs["options"]
67
 
                del kwargs["options"]
68
 
            if "clients" in kwargs:
69
 
                self.clients = kwargs["clients"]
70
 
                del kwargs["clients"]
71
 
            if "credentials" in kwargs:
72
 
                self.credentials = kwargs["credentials"]
73
 
                del kwargs["credentials"]
74
 
            return super(type(self), self).__init__(*args, **kwargs)
75
 
        attrs["__init__"] = init
76
 
        return type.__new__(cls, name, bases, attrs)
77
 
 
78
 
 
79
 
class udp_handler(SocketServer.DatagramRequestHandler, object):
80
 
    def handle(self):
81
 
        self.wfile.write("Polo")
82
 
        print "UDP request answered"
83
 
 
84
 
 
85
 
class IPv6_UDPServer(SocketServer.UDPServer, object):
86
 
    __metaclass__ = server_metaclass
87
 
    def verify_request(self, request, client_address):
88
 
        print "UDP request came"
89
 
        return request[0] == "Marco"
90
 
 
91
 
 
92
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
93
 
    def handle(self):
94
 
        print "TCP request came"
95
 
        print "Request:", self.request
96
 
        print "Client Address:", self.client_address
97
 
        print "Server:", self.server
98
 
        session = gnutls.connection.ServerSession(self.request,
99
 
                                                  self.server.credentials)
100
 
        session.handshake()
101
 
        if session.peer_certificate:
102
 
            print "DN:", session.peer_certificate.subject
103
 
        try:
104
 
            session.verify_peer()
105
 
        except gnutls.errors.CertificateError, error:
106
 
            print "Verify failed", error
107
 
            session.bye()
108
 
            return
109
 
        try:
110
 
            session.send(dict((client.dn, client.password)
111
 
                              for client in self.server.clients)
112
 
                         [session.peer_certificate.subject])
113
 
        except KeyError:
114
 
            session.send("gazonk")
115
 
            # Log maybe? XXX
 
404
                    command = self.checker_command % escaped_attrs
 
405
                except TypeError, error:
 
406
                    logger.error(u'Could not format string "%s":'
 
407
                                 u' %s', self.checker_command, error)
 
408
                    return True # Try again later
 
409
                self.current_checker_command = command
 
410
            try:
 
411
                logger.info(u"Starting checker %r for %s",
 
412
                            command, self.name)
 
413
                # We don't need to redirect stdout and stderr, since
 
414
                # in normal mode, that is already done by daemon(),
 
415
                # and in debug mode we don't want to.  (Stdin is
 
416
                # always replaced by /dev/null.)
 
417
                self.checker = subprocess.Popen(command,
 
418
                                                close_fds=True,
 
419
                                                shell=True, cwd="/")
 
420
                if self.use_dbus:
 
421
                    # Emit D-Bus signal
 
422
                    self.CheckerStarted(command)
 
423
                    self.PropertyChanged(
 
424
                        dbus.String("checker_running"),
 
425
                        dbus.Boolean(True, variant_level=1))
 
426
                self.checker_callback_tag = (gobject.child_watch_add
 
427
                                             (self.checker.pid,
 
428
                                              self.checker_callback,
 
429
                                              data=command))
 
430
                # The checker may have completed before the gobject
 
431
                # watch was added.  Check for this.
 
432
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
433
                if pid:
 
434
                    gobject.source_remove(self.checker_callback_tag)
 
435
                    self.checker_callback(pid, status, command)
 
436
            except OSError, error:
 
437
                logger.error(u"Failed to start subprocess: %s",
 
438
                             error)
 
439
        # Re-run this periodically if run by gobject.timeout_add
 
440
        return True
 
441
    
 
442
    def stop_checker(self):
 
443
        """Force the checker process, if any, to stop."""
 
444
        if self.checker_callback_tag:
 
445
            gobject.source_remove(self.checker_callback_tag)
 
446
            self.checker_callback_tag = None
 
447
        if getattr(self, "checker", None) is None:
 
448
            return
 
449
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
450
        try:
 
451
            os.kill(self.checker.pid, signal.SIGTERM)
 
452
            #os.sleep(0.5)
 
453
            #if self.checker.poll() is None:
 
454
            #    os.kill(self.checker.pid, signal.SIGKILL)
 
455
        except OSError, error:
 
456
            if error.errno != errno.ESRCH: # No such process
 
457
                raise
 
458
        self.checker = None
 
459
        if self.use_dbus:
 
460
            self.PropertyChanged(dbus.String(u"checker_running"),
 
461
                                 dbus.Boolean(False, variant_level=1))
 
462
    
 
463
    def still_valid(self):
 
464
        """Has the timeout not yet passed for this client?"""
 
465
        if not getattr(self, "enabled", False):
 
466
            return False
 
467
        now = datetime.datetime.utcnow()
 
468
        if self.last_checked_ok is None:
 
469
            return now < (self.created + self.timeout)
 
470
        else:
 
471
            return now < (self.last_checked_ok + self.timeout)
 
472
    
 
473
    ## D-Bus methods & signals
 
474
    _interface = u"se.bsnet.fukt.Mandos.Client"
 
475
    
 
476
    # CheckedOK - method
 
477
    CheckedOK = dbus.service.method(_interface)(checked_ok)
 
478
    CheckedOK.__name__ = "CheckedOK"
 
479
    
 
480
    # CheckerCompleted - signal
 
481
    @dbus.service.signal(_interface, signature="nxs")
 
482
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
483
        "D-Bus signal"
 
484
        pass
 
485
    
 
486
    # CheckerStarted - signal
 
487
    @dbus.service.signal(_interface, signature="s")
 
488
    def CheckerStarted(self, command):
 
489
        "D-Bus signal"
 
490
        pass
 
491
    
 
492
    # GetAllProperties - method
 
493
    @dbus.service.method(_interface, out_signature="a{sv}")
 
494
    def GetAllProperties(self):
 
495
        "D-Bus method"
 
496
        return dbus.Dictionary({
 
497
                dbus.String("name"):
 
498
                    dbus.String(self.name, variant_level=1),
 
499
                dbus.String("fingerprint"):
 
500
                    dbus.String(self.fingerprint, variant_level=1),
 
501
                dbus.String("host"):
 
502
                    dbus.String(self.host, variant_level=1),
 
503
                dbus.String("created"):
 
504
                    _datetime_to_dbus(self.created, variant_level=1),
 
505
                dbus.String("last_enabled"):
 
506
                    (_datetime_to_dbus(self.last_enabled,
 
507
                                       variant_level=1)
 
508
                     if self.last_enabled is not None
 
509
                     else dbus.Boolean(False, variant_level=1)),
 
510
                dbus.String("enabled"):
 
511
                    dbus.Boolean(self.enabled, variant_level=1),
 
512
                dbus.String("last_checked_ok"):
 
513
                    (_datetime_to_dbus(self.last_checked_ok,
 
514
                                       variant_level=1)
 
515
                     if self.last_checked_ok is not None
 
516
                     else dbus.Boolean (False, variant_level=1)),
 
517
                dbus.String("timeout"):
 
518
                    dbus.UInt64(self.timeout_milliseconds(),
 
519
                                variant_level=1),
 
520
                dbus.String("interval"):
 
521
                    dbus.UInt64(self.interval_milliseconds(),
 
522
                                variant_level=1),
 
523
                dbus.String("checker"):
 
524
                    dbus.String(self.checker_command,
 
525
                                variant_level=1),
 
526
                dbus.String("checker_running"):
 
527
                    dbus.Boolean(self.checker is not None,
 
528
                                 variant_level=1),
 
529
                dbus.String("object_path"):
 
530
                    dbus.ObjectPath(self.dbus_object_path,
 
531
                                    variant_level=1)
 
532
                }, signature="sv")
 
533
    
 
534
    # IsStillValid - method
 
535
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
 
536
                    (still_valid))
 
537
    IsStillValid.__name__ = "IsStillValid"
 
538
    
 
539
    # PropertyChanged - signal
 
540
    @dbus.service.signal(_interface, signature="sv")
 
541
    def PropertyChanged(self, property, value):
 
542
        "D-Bus signal"
 
543
        pass
 
544
    
 
545
    # SetChecker - method
 
546
    @dbus.service.method(_interface, in_signature="s")
 
547
    def SetChecker(self, checker):
 
548
        "D-Bus setter method"
 
549
        self.checker_command = checker
 
550
        # Emit D-Bus signal
 
551
        self.PropertyChanged(dbus.String(u"checker"),
 
552
                             dbus.String(self.checker_command,
 
553
                                         variant_level=1))
 
554
    
 
555
    # SetHost - method
 
556
    @dbus.service.method(_interface, in_signature="s")
 
557
    def SetHost(self, host):
 
558
        "D-Bus setter method"
 
559
        self.host = host
 
560
        # Emit D-Bus signal
 
561
        self.PropertyChanged(dbus.String(u"host"),
 
562
                             dbus.String(self.host, variant_level=1))
 
563
    
 
564
    # SetInterval - method
 
565
    @dbus.service.method(_interface, in_signature="t")
 
566
    def SetInterval(self, milliseconds):
 
567
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
 
568
        # Emit D-Bus signal
 
569
        self.PropertyChanged(dbus.String(u"interval"),
 
570
                             (dbus.UInt64(self.interval_milliseconds(),
 
571
                                          variant_level=1)))
 
572
    
 
573
    # SetSecret - method
 
574
    @dbus.service.method(_interface, in_signature="ay",
 
575
                         byte_arrays=True)
 
576
    def SetSecret(self, secret):
 
577
        "D-Bus setter method"
 
578
        self.secret = str(secret)
 
579
    
 
580
    # SetTimeout - method
 
581
    @dbus.service.method(_interface, in_signature="t")
 
582
    def SetTimeout(self, milliseconds):
 
583
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
 
584
        # Emit D-Bus signal
 
585
        self.PropertyChanged(dbus.String(u"timeout"),
 
586
                             (dbus.UInt64(self.timeout_milliseconds(),
 
587
                                          variant_level=1)))
 
588
    
 
589
    # Enable - method
 
590
    Enable = dbus.service.method(_interface)(enable)
 
591
    Enable.__name__ = "Enable"
 
592
    
 
593
    # StartChecker - method
 
594
    @dbus.service.method(_interface)
 
595
    def StartChecker(self):
 
596
        "D-Bus method"
 
597
        self.start_checker()
 
598
    
 
599
    # Disable - method
 
600
    @dbus.service.method(_interface)
 
601
    def Disable(self):
 
602
        "D-Bus method"
 
603
        self.disable()
 
604
    
 
605
    # StopChecker - method
 
606
    StopChecker = dbus.service.method(_interface)(stop_checker)
 
607
    StopChecker.__name__ = "StopChecker"
 
608
    
 
609
    del _interface
 
610
 
 
611
 
 
612
def peer_certificate(session):
 
613
    "Return the peer's OpenPGP certificate as a bytestring"
 
614
    # If not an OpenPGP certificate...
 
615
    if (gnutls.library.functions
 
616
        .gnutls_certificate_type_get(session._c_object)
 
617
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
618
        # ...do the normal thing
 
619
        return session.peer_certificate
 
620
    list_size = ctypes.c_uint(1)
 
621
    cert_list = (gnutls.library.functions
 
622
                 .gnutls_certificate_get_peers
 
623
                 (session._c_object, ctypes.byref(list_size)))
 
624
    if not bool(cert_list) and list_size.value != 0:
 
625
        raise gnutls.errors.GNUTLSError("error getting peer"
 
626
                                        " certificate")
 
627
    if list_size.value == 0:
 
628
        return None
 
629
    cert = cert_list[0]
 
630
    return ctypes.string_at(cert.data, cert.size)
 
631
 
 
632
 
 
633
def fingerprint(openpgp):
 
634
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
635
    # New GnuTLS "datum" with the OpenPGP public key
 
636
    datum = (gnutls.library.types
 
637
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
638
                                         ctypes.POINTER
 
639
                                         (ctypes.c_ubyte)),
 
640
                             ctypes.c_uint(len(openpgp))))
 
641
    # New empty GnuTLS certificate
 
642
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
643
    (gnutls.library.functions
 
644
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
645
    # Import the OpenPGP public key into the certificate
 
646
    (gnutls.library.functions
 
647
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
648
                                gnutls.library.constants
 
649
                                .GNUTLS_OPENPGP_FMT_RAW))
 
650
    # Verify the self signature in the key
 
651
    crtverify = ctypes.c_uint()
 
652
    (gnutls.library.functions
 
653
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
 
654
    if crtverify.value != 0:
 
655
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
656
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
657
    # New buffer for the fingerprint
 
658
    buf = ctypes.create_string_buffer(20)
 
659
    buf_len = ctypes.c_size_t()
 
660
    # Get the fingerprint from the certificate into the buffer
 
661
    (gnutls.library.functions
 
662
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
663
                                         ctypes.byref(buf_len)))
 
664
    # Deinit the certificate
 
665
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
666
    # Convert the buffer to a Python bytestring
 
667
    fpr = ctypes.string_at(buf, buf_len.value)
 
668
    # Convert the bytestring to hexadecimal notation
 
669
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
670
    return hex_fpr
 
671
 
 
672
 
 
673
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
674
    """A TCP request handler class.
 
675
    Instantiated by IPv6_TCPServer for each request to handle it.
 
676
    Note: This will run in its own forked process."""
 
677
    
 
678
    def handle(self):
 
679
        logger.info(u"TCP connection from: %s",
 
680
                    unicode(self.client_address))
 
681
        session = (gnutls.connection
 
682
                   .ClientSession(self.request,
 
683
                                  gnutls.connection
 
684
                                  .X509Credentials()))
 
685
        
 
686
        line = self.request.makefile().readline()
 
687
        logger.debug(u"Protocol version: %r", line)
 
688
        try:
 
689
            if int(line.strip().split()[0]) > 1:
 
690
                raise RuntimeError
 
691
        except (ValueError, IndexError, RuntimeError), error:
 
692
            logger.error(u"Unknown protocol version: %s", error)
 
693
            return
 
694
        
 
695
        # Note: gnutls.connection.X509Credentials is really a generic
 
696
        # GnuTLS certificate credentials object so long as no X.509
 
697
        # keys are added to it.  Therefore, we can use it here despite
 
698
        # using OpenPGP certificates.
 
699
        
 
700
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
701
        #                     "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
702
        #                     "+DHE-DSS"))
 
703
        # Use a fallback default, since this MUST be set.
 
704
        priority = self.server.settings.get("priority", "NORMAL")
 
705
        (gnutls.library.functions
 
706
         .gnutls_priority_set_direct(session._c_object,
 
707
                                     priority, None))
 
708
        
 
709
        try:
 
710
            session.handshake()
 
711
        except gnutls.errors.GNUTLSError, error:
 
712
            logger.warning(u"Handshake failed: %s", error)
 
713
            # Do not run session.bye() here: the session is not
 
714
            # established.  Just abandon the request.
 
715
            return
 
716
        logger.debug(u"Handshake succeeded")
 
717
        try:
 
718
            fpr = fingerprint(peer_certificate(session))
 
719
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
720
            logger.warning(u"Bad certificate: %s", error)
 
721
            session.bye()
 
722
            return
 
723
        logger.debug(u"Fingerprint: %s", fpr)
 
724
        
 
725
        for c in self.server.clients:
 
726
            if c.fingerprint == fpr:
 
727
                client = c
 
728
                break
 
729
        else:
 
730
            logger.warning(u"Client not found for fingerprint: %s",
 
731
                           fpr)
 
732
            session.bye()
 
733
            return
 
734
        # Have to check if client.still_valid(), since it is possible
 
735
        # that the client timed out while establishing the GnuTLS
 
736
        # session.
 
737
        if not client.still_valid():
 
738
            logger.warning(u"Client %(name)s is invalid",
 
739
                           vars(client))
 
740
            session.bye()
 
741
            return
 
742
        ## This won't work here, since we're in a fork.
 
743
        # client.checked_ok()
 
744
        sent_size = 0
 
745
        while sent_size < len(client.secret):
 
746
            sent = session.send(client.secret[sent_size:])
 
747
            logger.debug(u"Sent: %d, remaining: %d",
 
748
                         sent, len(client.secret)
 
749
                         - (sent_size + sent))
 
750
            sent_size += sent
116
751
        session.bye()
117
752
 
118
753
 
119
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
120
 
    __metaclass__ = server_metaclass
121
 
    request_queue_size = 1024
122
 
 
123
 
 
124
 
in6addr_any = "::"
125
 
 
126
 
cred = None
 
754
class IPv6_TCPServer(SocketServer.ForkingMixIn,
 
755
                     SocketServer.TCPServer, object):
 
756
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
757
    Attributes:
 
758
        settings:       Server settings
 
759
        clients:        Set() of Client objects
 
760
        enabled:        Boolean; whether this server is activated yet
 
761
    """
 
762
    address_family = socket.AF_INET6
 
763
    def __init__(self, *args, **kwargs):
 
764
        if "settings" in kwargs:
 
765
            self.settings = kwargs["settings"]
 
766
            del kwargs["settings"]
 
767
        if "clients" in kwargs:
 
768
            self.clients = kwargs["clients"]
 
769
            del kwargs["clients"]
 
770
        if "use_ipv6" in kwargs:
 
771
            if not kwargs["use_ipv6"]:
 
772
                self.address_family = socket.AF_INET
 
773
            del kwargs["use_ipv6"]
 
774
        self.enabled = False
 
775
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
776
    def server_bind(self):
 
777
        """This overrides the normal server_bind() function
 
778
        to bind to an interface if one was specified, and also NOT to
 
779
        bind to an address or port if they were not specified."""
 
780
        if self.settings["interface"]:
 
781
            # 25 is from /usr/include/asm-i486/socket.h
 
782
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
783
            try:
 
784
                self.socket.setsockopt(socket.SOL_SOCKET,
 
785
                                       SO_BINDTODEVICE,
 
786
                                       self.settings["interface"])
 
787
            except socket.error, error:
 
788
                if error[0] == errno.EPERM:
 
789
                    logger.error(u"No permission to"
 
790
                                 u" bind to interface %s",
 
791
                                 self.settings["interface"])
 
792
                else:
 
793
                    raise
 
794
        # Only bind(2) the socket if we really need to.
 
795
        if self.server_address[0] or self.server_address[1]:
 
796
            if not self.server_address[0]:
 
797
                if self.address_family == socket.AF_INET6:
 
798
                    any_address = "::" # in6addr_any
 
799
                else:
 
800
                    any_address = socket.INADDR_ANY
 
801
                self.server_address = (any_address,
 
802
                                       self.server_address[1])
 
803
            elif not self.server_address[1]:
 
804
                self.server_address = (self.server_address[0],
 
805
                                       0)
 
806
#                 if self.settings["interface"]:
 
807
#                     self.server_address = (self.server_address[0],
 
808
#                                            0, # port
 
809
#                                            0, # flowinfo
 
810
#                                            if_nametoindex
 
811
#                                            (self.settings
 
812
#                                             ["interface"]))
 
813
            return super(IPv6_TCPServer, self).server_bind()
 
814
    def server_activate(self):
 
815
        if self.enabled:
 
816
            return super(IPv6_TCPServer, self).server_activate()
 
817
    def enable(self):
 
818
        self.enabled = True
 
819
 
127
820
 
128
821
def string_to_delta(interval):
129
822
    """Parse a string and return a datetime.timedelta
130
 
 
 
823
    
131
824
    >>> string_to_delta('7d')
132
825
    datetime.timedelta(7)
133
826
    >>> string_to_delta('60s')
138
831
    datetime.timedelta(1)
139
832
    >>> string_to_delta(u'1w')
140
833
    datetime.timedelta(7)
 
834
    >>> string_to_delta('5m 30s')
 
835
    datetime.timedelta(0, 330)
141
836
    """
142
 
    try:
143
 
        suffix=unicode(interval[-1])
144
 
        value=int(interval[:-1])
145
 
        if suffix == u"d":
146
 
            delta = datetime.timedelta(value)
147
 
        elif suffix == u"s":
148
 
            delta = datetime.timedelta(0, value)
149
 
        elif suffix == u"m":
150
 
            delta = datetime.timedelta(0, 0, 0, 0, value)
151
 
        elif suffix == u"h":
152
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
153
 
        elif suffix == u"w":
154
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
155
 
        else:
 
837
    timevalue = datetime.timedelta(0)
 
838
    for s in interval.split():
 
839
        try:
 
840
            suffix = unicode(s[-1])
 
841
            value = int(s[:-1])
 
842
            if suffix == u"d":
 
843
                delta = datetime.timedelta(value)
 
844
            elif suffix == u"s":
 
845
                delta = datetime.timedelta(0, value)
 
846
            elif suffix == u"m":
 
847
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
848
            elif suffix == u"h":
 
849
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
850
            elif suffix == u"w":
 
851
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
852
            else:
 
853
                raise ValueError
 
854
        except (ValueError, IndexError):
156
855
            raise ValueError
157
 
    except (ValueError, IndexError):
158
 
        raise ValueError
159
 
    return delta
 
856
        timevalue += delta
 
857
    return timevalue
 
858
 
 
859
 
 
860
def server_state_changed(state):
 
861
    """Derived from the Avahi example code"""
 
862
    if state == avahi.SERVER_COLLISION:
 
863
        logger.error(u"Zeroconf server name collision")
 
864
        service.remove()
 
865
    elif state == avahi.SERVER_RUNNING:
 
866
        service.add()
 
867
 
 
868
 
 
869
def entry_group_state_changed(state, error):
 
870
    """Derived from the Avahi example code"""
 
871
    logger.debug(u"Avahi state change: %i", state)
 
872
    
 
873
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
874
        logger.debug(u"Zeroconf service established.")
 
875
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
876
        logger.warning(u"Zeroconf service name collision.")
 
877
        service.rename()
 
878
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
879
        logger.critical(u"Avahi: Error in group state changed %s",
 
880
                        unicode(error))
 
881
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
 
882
 
 
883
def if_nametoindex(interface):
 
884
    """Call the C function if_nametoindex(), or equivalent"""
 
885
    global if_nametoindex
 
886
    try:
 
887
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
888
                          (ctypes.util.find_library("c"))
 
889
                          .if_nametoindex)
 
890
    except (OSError, AttributeError):
 
891
        if "struct" not in sys.modules:
 
892
            import struct
 
893
        if "fcntl" not in sys.modules:
 
894
            import fcntl
 
895
        def if_nametoindex(interface):
 
896
            "Get an interface index the hard way, i.e. using fcntl()"
 
897
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
898
            with closing(socket.socket()) as s:
 
899
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
900
                                    struct.pack("16s16x", interface))
 
901
            interface_index = struct.unpack("I", ifreq[16:20])[0]
 
902
            return interface_index
 
903
    return if_nametoindex(interface)
 
904
 
 
905
 
 
906
def daemon(nochdir = False, noclose = False):
 
907
    """See daemon(3).  Standard BSD Unix function.
 
908
    This should really exist as os.daemon, but it doesn't (yet)."""
 
909
    if os.fork():
 
910
        sys.exit()
 
911
    os.setsid()
 
912
    if not nochdir:
 
913
        os.chdir("/")
 
914
    if os.fork():
 
915
        sys.exit()
 
916
    if not noclose:
 
917
        # Close all standard open file descriptors
 
918
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
919
        if not stat.S_ISCHR(os.fstat(null).st_mode):
 
920
            raise OSError(errno.ENODEV,
 
921
                          "/dev/null not a character device")
 
922
        os.dup2(null, sys.stdin.fileno())
 
923
        os.dup2(null, sys.stdout.fileno())
 
924
        os.dup2(null, sys.stderr.fileno())
 
925
        if null > 2:
 
926
            os.close(null)
 
927
 
160
928
 
161
929
def main():
162
 
    parser = OptionParser()
 
930
    parser = optparse.OptionParser(version = "%%prog %s" % version)
163
931
    parser.add_option("-i", "--interface", type="string",
164
 
                      default="eth0", metavar="IF",
165
 
                      help="Interface to bind to")
166
 
    parser.add_option("--cert", type="string", default="cert.pem",
167
 
                      metavar="FILE",
168
 
                      help="Public key certificate to use")
169
 
    parser.add_option("--key", type="string", default="key.pem",
170
 
                      metavar="FILE",
171
 
                      help="Private key to use")
172
 
    parser.add_option("--ca", type="string", default="ca.pem",
173
 
                      metavar="FILE",
174
 
                      help="Certificate Authority certificate to use")
175
 
    parser.add_option("--crl", type="string", default="crl.pem",
176
 
                      metavar="FILE",
177
 
                      help="Certificate Revokation List to use")
178
 
    parser.add_option("-p", "--port", type="int", default=49001,
 
932
                      metavar="IF", help="Bind to interface IF")
 
933
    parser.add_option("-a", "--address", type="string",
 
934
                      help="Address to listen for requests on")
 
935
    parser.add_option("-p", "--port", type="int",
179
936
                      help="Port number to receive requests on")
180
 
    parser.add_option("--dh", type="int", metavar="BITS",
181
 
                      help="DH group to use")
182
 
    parser.add_option("-t", "--timeout", type="string", # Parsed later
183
 
                      default="15m",
184
 
                      help="Amount of downtime allowed for clients")
185
 
    parser.add_option("--interval", type="string", # Parsed later
186
 
                      default="5m",
187
 
                      help="How often to check that a client is up")
188
 
    parser.add_option("--check", action="store_true", default=False,
 
937
    parser.add_option("--check", action="store_true",
189
938
                      help="Run self-test")
190
 
    (options, args) = parser.parse_args()
191
 
 
 
939
    parser.add_option("--debug", action="store_true",
 
940
                      help="Debug mode; run in foreground and log to"
 
941
                      " terminal")
 
942
    parser.add_option("--priority", type="string", help="GnuTLS"
 
943
                      " priority string (see GnuTLS documentation)")
 
944
    parser.add_option("--servicename", type="string", metavar="NAME",
 
945
                      help="Zeroconf service name")
 
946
    parser.add_option("--configdir", type="string",
 
947
                      default="/etc/mandos", metavar="DIR",
 
948
                      help="Directory to search for configuration"
 
949
                      " files")
 
950
    parser.add_option("--no-dbus", action="store_false",
 
951
                      dest="use_dbus",
 
952
                      help=optparse.SUPPRESS_HELP) # XXX: Not done yet
 
953
    parser.add_option("--no-ipv6", action="store_false",
 
954
                      dest="use_ipv6", help="Do not use IPv6")
 
955
    options = parser.parse_args()[0]
 
956
    
192
957
    if options.check:
193
958
        import doctest
194
959
        doctest.testmod()
195
960
        sys.exit()
196
961
    
197
 
    # Parse the time arguments
198
 
    try:
199
 
        options.timeout = string_to_delta(options.timeout)
200
 
    except ValueError:
201
 
        parser.error("option --timeout: Unparseable time")
202
 
    
203
 
    try:
204
 
        options.interval = string_to_delta(options.interval)
205
 
    except ValueError:
206
 
        parser.error("option --interval: Unparseable time")
207
 
    
208
 
    cert = gnutls.crypto.X509Certificate(open(options.cert).read())
209
 
    key = gnutls.crypto.X509PrivateKey(open(options.key).read())
210
 
    ca = gnutls.crypto.X509Certificate(open(options.ca).read())
211
 
    crl = gnutls.crypto.X509CRL(open(options.crl).read())
212
 
    cred = gnutls.connection.X509Credentials(cert, key, [ca], [crl])
213
 
    
214
 
    # Parse config file
215
 
    defaults = {}
216
 
    client_config_object = ConfigParser.SafeConfigParser(defaults)
217
 
    client_config_object.read("mandos-clients.conf")
218
 
    clients = [Client(name=section, options=options,
219
 
                      **(dict(client_config_object.items(section))))
220
 
               for section in client_config_object.sections()]
221
 
    
222
 
    udp_server = IPv6_UDPServer((in6addr_any, options.port),
223
 
                                udp_handler,
224
 
                                options=options)
225
 
    
226
 
    tcp_server = IPv6_TCPServer((in6addr_any, options.port),
227
 
                                tcp_handler,
228
 
                                options=options,
229
 
                                clients=clients,
230
 
                                credentials=cred)
231
 
    
232
 
    while True:
233
 
        in_, out, err = select.select((udp_server,
234
 
                                       tcp_server), (), ())
235
 
        for server in in_:
236
 
            server.handle_request()
237
 
 
238
 
 
239
 
if __name__ == "__main__":
 
962
    # Default values for config file for server-global settings
 
963
    server_defaults = { "interface": "",
 
964
                        "address": "",
 
965
                        "port": "",
 
966
                        "debug": "False",
 
967
                        "priority":
 
968
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
969
                        "servicename": "Mandos",
 
970
                        "use_dbus": "True",
 
971
                        "use_ipv6": "True",
 
972
                        }
 
973
    
 
974
    # Parse config file for server-global settings
 
975
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
976
    del server_defaults
 
977
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
978
    # Convert the SafeConfigParser object to a dict
 
979
    server_settings = server_config.defaults()
 
980
    # Use the appropriate methods on the non-string config options
 
981
    server_settings["debug"] = server_config.getboolean("DEFAULT",
 
982
                                                        "debug")
 
983
    server_settings["use_dbus"] = server_config.getboolean("DEFAULT",
 
984
                                                           "use_dbus")
 
985
    server_settings["use_ipv6"] = server_config.getboolean("DEFAULT",
 
986
                                                           "use_ipv6")
 
987
    if server_settings["port"]:
 
988
        server_settings["port"] = server_config.getint("DEFAULT",
 
989
                                                       "port")
 
990
    del server_config
 
991
    
 
992
    # Override the settings from the config file with command line
 
993
    # options, if set.
 
994
    for option in ("interface", "address", "port", "debug",
 
995
                   "priority", "servicename", "configdir",
 
996
                   "use_dbus", "use_ipv6"):
 
997
        value = getattr(options, option)
 
998
        if value is not None:
 
999
            server_settings[option] = value
 
1000
    del options
 
1001
    # Now we have our good server settings in "server_settings"
 
1002
    
 
1003
    # For convenience
 
1004
    debug = server_settings["debug"]
 
1005
    use_dbus = server_settings["use_dbus"]
 
1006
    use_dbus = False            # XXX: Not done yet
 
1007
    use_ipv6 = server_settings["use_ipv6"]
 
1008
    
 
1009
    if not debug:
 
1010
        syslogger.setLevel(logging.WARNING)
 
1011
        console.setLevel(logging.WARNING)
 
1012
    
 
1013
    if server_settings["servicename"] != "Mandos":
 
1014
        syslogger.setFormatter(logging.Formatter
 
1015
                               ('Mandos (%s): %%(levelname)s:'
 
1016
                                ' %%(message)s'
 
1017
                                % server_settings["servicename"]))
 
1018
    
 
1019
    # Parse config file with clients
 
1020
    client_defaults = { "timeout": "1h",
 
1021
                        "interval": "5m",
 
1022
                        "checker": "fping -q -- %%(host)s",
 
1023
                        "host": "",
 
1024
                        }
 
1025
    client_config = ConfigParser.SafeConfigParser(client_defaults)
 
1026
    client_config.read(os.path.join(server_settings["configdir"],
 
1027
                                    "clients.conf"))
 
1028
    
 
1029
    clients = Set()
 
1030
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
1031
                                 server_settings["port"]),
 
1032
                                TCP_handler,
 
1033
                                settings=server_settings,
 
1034
                                clients=clients, use_ipv6=use_ipv6)
 
1035
    pidfilename = "/var/run/mandos.pid"
 
1036
    try:
 
1037
        pidfile = open(pidfilename, "w")
 
1038
    except IOError:
 
1039
        logger.error("Could not open file %r", pidfilename)
 
1040
    
 
1041
    try:
 
1042
        uid = pwd.getpwnam("_mandos").pw_uid
 
1043
        gid = pwd.getpwnam("_mandos").pw_gid
 
1044
    except KeyError:
 
1045
        try:
 
1046
            uid = pwd.getpwnam("mandos").pw_uid
 
1047
            gid = pwd.getpwnam("mandos").pw_gid
 
1048
        except KeyError:
 
1049
            try:
 
1050
                uid = pwd.getpwnam("nobody").pw_uid
 
1051
                gid = pwd.getpwnam("nogroup").pw_gid
 
1052
            except KeyError:
 
1053
                uid = 65534
 
1054
                gid = 65534
 
1055
    try:
 
1056
        os.setgid(gid)
 
1057
        os.setuid(uid)
 
1058
    except OSError, error:
 
1059
        if error[0] != errno.EPERM:
 
1060
            raise error
 
1061
    
 
1062
    # Enable all possible GnuTLS debugging
 
1063
    if debug:
 
1064
        # "Use a log level over 10 to enable all debugging options."
 
1065
        # - GnuTLS manual
 
1066
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1067
        
 
1068
        @gnutls.library.types.gnutls_log_func
 
1069
        def debug_gnutls(level, string):
 
1070
            logger.debug("GnuTLS: %s", string[:-1])
 
1071
        
 
1072
        (gnutls.library.functions
 
1073
         .gnutls_global_set_log_function(debug_gnutls))
 
1074
    
 
1075
    global service
 
1076
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
1077
    service = AvahiService(name = server_settings["servicename"],
 
1078
                           servicetype = "_mandos._tcp",
 
1079
                           protocol = protocol)
 
1080
    if server_settings["interface"]:
 
1081
        service.interface = (if_nametoindex
 
1082
                             (server_settings["interface"]))
 
1083
    
 
1084
    global main_loop
 
1085
    global bus
 
1086
    global server
 
1087
    # From the Avahi example code
 
1088
    DBusGMainLoop(set_as_default=True )
 
1089
    main_loop = gobject.MainLoop()
 
1090
    bus = dbus.SystemBus()
 
1091
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
 
1092
                                           avahi.DBUS_PATH_SERVER),
 
1093
                            avahi.DBUS_INTERFACE_SERVER)
 
1094
    # End of Avahi example code
 
1095
    if use_dbus:
 
1096
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
 
1097
    
 
1098
    clients.update(Set(Client(name = section,
 
1099
                              config
 
1100
                              = dict(client_config.items(section)),
 
1101
                              use_dbus = use_dbus)
 
1102
                       for section in client_config.sections()))
 
1103
    if not clients:
 
1104
        logger.warning(u"No clients defined")
 
1105
    
 
1106
    if debug:
 
1107
        # Redirect stdin so all checkers get /dev/null
 
1108
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1109
        os.dup2(null, sys.stdin.fileno())
 
1110
        if null > 2:
 
1111
            os.close(null)
 
1112
    else:
 
1113
        # No console logging
 
1114
        logger.removeHandler(console)
 
1115
        # Close all input and output, do double fork, etc.
 
1116
        daemon()
 
1117
    
 
1118
    try:
 
1119
        pid = os.getpid()
 
1120
        pidfile.write(str(pid) + "\n")
 
1121
        pidfile.close()
 
1122
        del pidfile
 
1123
    except IOError:
 
1124
        logger.error(u"Could not write to file %r with PID %d",
 
1125
                     pidfilename, pid)
 
1126
    except NameError:
 
1127
        # "pidfile" was never created
 
1128
        pass
 
1129
    del pidfilename
 
1130
    
 
1131
    def cleanup():
 
1132
        "Cleanup function; run on exit"
 
1133
        global group
 
1134
        # From the Avahi example code
 
1135
        if not group is None:
 
1136
            group.Free()
 
1137
            group = None
 
1138
        # End of Avahi example code
 
1139
        
 
1140
        while clients:
 
1141
            client = clients.pop()
 
1142
            client.disable_hook = None
 
1143
            client.disable()
 
1144
    
 
1145
    atexit.register(cleanup)
 
1146
    
 
1147
    if not debug:
 
1148
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
1149
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
1150
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
1151
    
 
1152
    if use_dbus:
 
1153
        class MandosServer(dbus.service.Object):
 
1154
            """A D-Bus proxy object"""
 
1155
            def __init__(self):
 
1156
                dbus.service.Object.__init__(self, bus, "/")
 
1157
            _interface = u"se.bsnet.fukt.Mandos"
 
1158
            
 
1159
            @dbus.service.signal(_interface, signature="oa{sv}")
 
1160
            def ClientAdded(self, objpath, properties):
 
1161
                "D-Bus signal"
 
1162
                pass
 
1163
            
 
1164
            @dbus.service.signal(_interface, signature="os")
 
1165
            def ClientRemoved(self, objpath, name):
 
1166
                "D-Bus signal"
 
1167
                pass
 
1168
            
 
1169
            @dbus.service.method(_interface, out_signature="ao")
 
1170
            def GetAllClients(self):
 
1171
                "D-Bus method"
 
1172
                return dbus.Array(c.dbus_object_path for c in clients)
 
1173
            
 
1174
            @dbus.service.method(_interface, out_signature="a{oa{sv}}")
 
1175
            def GetAllClientsWithProperties(self):
 
1176
                "D-Bus method"
 
1177
                return dbus.Dictionary(
 
1178
                    ((c.dbus_object_path, c.GetAllProperties())
 
1179
                     for c in clients),
 
1180
                    signature="oa{sv}")
 
1181
            
 
1182
            @dbus.service.method(_interface, in_signature="o")
 
1183
            def RemoveClient(self, object_path):
 
1184
                "D-Bus method"
 
1185
                for c in clients:
 
1186
                    if c.dbus_object_path == object_path:
 
1187
                        clients.remove(c)
 
1188
                        # Don't signal anything except ClientRemoved
 
1189
                        c.use_dbus = False
 
1190
                        c.disable()
 
1191
                        # Emit D-Bus signal
 
1192
                        self.ClientRemoved(object_path, c.name)
 
1193
                        return
 
1194
                raise KeyError
 
1195
            
 
1196
            del _interface
 
1197
        
 
1198
        mandos_server = MandosServer()
 
1199
    
 
1200
    for client in clients:
 
1201
        if use_dbus:
 
1202
            # Emit D-Bus signal
 
1203
            mandos_server.ClientAdded(client.dbus_object_path,
 
1204
                                      client.GetAllProperties())
 
1205
        client.enable()
 
1206
    
 
1207
    tcp_server.enable()
 
1208
    tcp_server.server_activate()
 
1209
    
 
1210
    # Find out what port we got
 
1211
    service.port = tcp_server.socket.getsockname()[1]
 
1212
    if use_ipv6:
 
1213
        logger.info(u"Now listening on address %r, port %d,"
 
1214
                    " flowinfo %d, scope_id %d"
 
1215
                    % tcp_server.socket.getsockname())
 
1216
    else:                       # IPv4
 
1217
        logger.info(u"Now listening on address %r, port %d"
 
1218
                    % tcp_server.socket.getsockname())
 
1219
    
 
1220
    #service.interface = tcp_server.socket.getsockname()[3]
 
1221
    
 
1222
    try:
 
1223
        # From the Avahi example code
 
1224
        server.connect_to_signal("StateChanged", server_state_changed)
 
1225
        try:
 
1226
            server_state_changed(server.GetState())
 
1227
        except dbus.exceptions.DBusException, error:
 
1228
            logger.critical(u"DBusException: %s", error)
 
1229
            sys.exit(1)
 
1230
        # End of Avahi example code
 
1231
        
 
1232
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
1233
                             lambda *args, **kwargs:
 
1234
                             (tcp_server.handle_request
 
1235
                              (*args[2:], **kwargs) or True))
 
1236
        
 
1237
        logger.debug(u"Starting main loop")
 
1238
        main_loop.run()
 
1239
    except AvahiError, error:
 
1240
        logger.critical(u"AvahiError: %s", error)
 
1241
        sys.exit(1)
 
1242
    except KeyboardInterrupt:
 
1243
        if debug:
 
1244
            print >> sys.stderr
 
1245
        logger.debug("Server received KeyboardInterrupt")
 
1246
    logger.debug("Server exiting")
 
1247
 
 
1248
if __name__ == '__main__':
240
1249
    main()
241