/mandos/trunk

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  • Committer: Björn Påhlsson
  • Date: 2011-06-23 22:27:15 UTC
  • mto: This revision was merged to the branch mainline in revision 485.
  • Revision ID: belorn@fukt.bsnet.se-20110623222715-q5wro9ma9iyjl367
* Makefile (CFLAGS): Added "-lrt" to include real time library.
* plugins.d/mandos-client.c: use scandir(3) instead of readdir(3)
                             Prefix all debug output with "Mandos plugin " + program_invocation_short_name
                             Retry servers that failed to provide password.
                             New option --retry SECONDS that sets the interval between rechecking.
                             --retry also controls how often it retries a server when using --connect.
* plugins.d/splashy.c:  Prefix all debug output with "Mandos plugin " + program_invocation_short_name
* plugins.d/usplash.c: --||--
* plugins.d/askpass-fifo.c: --||--
* plugins.d/password-prompt.c: --||--
* plugins.d/plymouth.c: --||--
* mandos: Lower logger level from warning to info on failed client requests because client was disabled or unknown fingerprint.
* plugins.d/plymouth.c (get_pid): bug fix. Was not calling free on direntries. 

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1
#!/usr/bin/python
2
 
 
3
 
from __future__ import division
4
 
 
5
 
import SocketServer
 
2
# -*- mode: python; coding: utf-8 -*-
 
3
 
4
# Mandos server - give out binary blobs to connecting clients.
 
5
 
6
# This program is partly derived from an example program for an Avahi
 
7
# service publisher, downloaded from
 
8
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
 
9
# methods "add", "remove", "server_state_changed",
 
10
# "entry_group_state_changed", "cleanup", and "activate" in the
 
11
# "AvahiService" class, and some lines in "main".
 
12
 
13
# Everything else is
 
14
# Copyright © 2008-2011 Teddy Hogeborn
 
15
# Copyright © 2008-2011 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, absolute_import, print_function,
 
35
                        unicode_literals)
 
36
 
 
37
import SocketServer as socketserver
6
38
import socket
7
 
import select
8
 
from optparse import OptionParser
 
39
import argparse
9
40
import datetime
10
41
import errno
11
42
import gnutls.crypto
14
45
import gnutls.library.functions
15
46
import gnutls.library.constants
16
47
import gnutls.library.types
17
 
import ConfigParser
 
48
import ConfigParser as configparser
18
49
import sys
19
50
import re
20
51
import os
21
52
import signal
22
 
from sets import Set
23
53
import subprocess
 
54
import atexit
 
55
import stat
 
56
import logging
 
57
import logging.handlers
 
58
import pwd
 
59
import contextlib
 
60
import struct
 
61
import fcntl
 
62
import functools
 
63
import cPickle as pickle
 
64
import multiprocessing
24
65
 
25
66
import dbus
 
67
import dbus.service
26
68
import gobject
27
69
import avahi
28
70
from dbus.mainloop.glib import DBusGMainLoop
29
71
import ctypes
30
 
 
31
 
import logging
32
 
import logging.handlers
33
 
 
34
 
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
35
 
 
 
72
import ctypes.util
 
73
import xml.dom.minidom
 
74
import inspect
 
75
 
 
76
try:
 
77
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
 
78
except AttributeError:
 
79
    try:
 
80
        from IN import SO_BINDTODEVICE
 
81
    except ImportError:
 
82
        SO_BINDTODEVICE = None
 
83
 
 
84
 
 
85
version = "1.3.0"
 
86
 
 
87
#logger = logging.getLogger('mandos')
36
88
logger = logging.Logger('mandos')
37
 
logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))
38
 
 
39
 
# This variable is used to optionally bind to a specified interface.
40
 
# It is a global variable to fit in with the other variables from the
41
 
# Avahi server example code.
42
 
serviceInterface = avahi.IF_UNSPEC
43
 
# From the Avahi server example code:
44
 
serviceName = "Mandos"
45
 
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
46
 
servicePort = None                      # Not known at startup
47
 
serviceTXT = []                         # TXT record for the service
48
 
domain = ""                  # Domain to publish on, default to .local
49
 
host = ""          # Host to publish records for, default to localhost
50
 
group = None #our entry group
51
 
rename_count = 12       # Counter so we only rename after collisions a
52
 
                        # sensible number of times
53
 
# End of Avahi example code
 
89
syslogger = (logging.handlers.SysLogHandler
 
90
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
91
              address = str("/dev/log")))
 
92
syslogger.setFormatter(logging.Formatter
 
93
                       ('Mandos [%(process)d]: %(levelname)s:'
 
94
                        ' %(message)s'))
 
95
logger.addHandler(syslogger)
 
96
 
 
97
console = logging.StreamHandler()
 
98
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
 
99
                                       ' %(levelname)s:'
 
100
                                       ' %(message)s'))
 
101
logger.addHandler(console)
 
102
 
 
103
class AvahiError(Exception):
 
104
    def __init__(self, value, *args, **kwargs):
 
105
        self.value = value
 
106
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
107
    def __unicode__(self):
 
108
        return unicode(repr(self.value))
 
109
 
 
110
class AvahiServiceError(AvahiError):
 
111
    pass
 
112
 
 
113
class AvahiGroupError(AvahiError):
 
114
    pass
 
115
 
 
116
 
 
117
class AvahiService(object):
 
118
    """An Avahi (Zeroconf) service.
 
119
    
 
120
    Attributes:
 
121
    interface: integer; avahi.IF_UNSPEC or an interface index.
 
122
               Used to optionally bind to the specified interface.
 
123
    name: string; Example: 'Mandos'
 
124
    type: string; Example: '_mandos._tcp'.
 
125
                  See <http://www.dns-sd.org/ServiceTypes.html>
 
126
    port: integer; what port to announce
 
127
    TXT: list of strings; TXT record for the service
 
128
    domain: string; Domain to publish on, default to .local if empty.
 
129
    host: string; Host to publish records for, default is localhost
 
130
    max_renames: integer; maximum number of renames
 
131
    rename_count: integer; counter so we only rename after collisions
 
132
                  a sensible number of times
 
133
    group: D-Bus Entry Group
 
134
    server: D-Bus Server
 
135
    bus: dbus.SystemBus()
 
136
    """
 
137
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
 
138
                 servicetype = None, port = None, TXT = None,
 
139
                 domain = "", host = "", max_renames = 32768,
 
140
                 protocol = avahi.PROTO_UNSPEC, bus = None):
 
141
        self.interface = interface
 
142
        self.name = name
 
143
        self.type = servicetype
 
144
        self.port = port
 
145
        self.TXT = TXT if TXT is not None else []
 
146
        self.domain = domain
 
147
        self.host = host
 
148
        self.rename_count = 0
 
149
        self.max_renames = max_renames
 
150
        self.protocol = protocol
 
151
        self.group = None       # our entry group
 
152
        self.server = None
 
153
        self.bus = bus
 
154
        self.entry_group_state_changed_match = None
 
155
    def rename(self):
 
156
        """Derived from the Avahi example code"""
 
157
        if self.rename_count >= self.max_renames:
 
158
            logger.critical("No suitable Zeroconf service name found"
 
159
                            " after %i retries, exiting.",
 
160
                            self.rename_count)
 
161
            raise AvahiServiceError("Too many renames")
 
162
        self.name = unicode(self.server.GetAlternativeServiceName(self.name))
 
163
        logger.info("Changing Zeroconf service name to %r ...",
 
164
                    self.name)
 
165
        syslogger.setFormatter(logging.Formatter
 
166
                               ('Mandos (%s) [%%(process)d]:'
 
167
                                ' %%(levelname)s: %%(message)s'
 
168
                                % self.name))
 
169
        self.remove()
 
170
        try:
 
171
            self.add()
 
172
        except dbus.exceptions.DBusException as error:
 
173
            logger.critical("DBusException: %s", error)
 
174
            self.cleanup()
 
175
            os._exit(1)
 
176
        self.rename_count += 1
 
177
    def remove(self):
 
178
        """Derived from the Avahi example code"""
 
179
        if self.entry_group_state_changed_match is not None:
 
180
            self.entry_group_state_changed_match.remove()
 
181
            self.entry_group_state_changed_match = None
 
182
        if self.group is not None:
 
183
            self.group.Reset()
 
184
    def add(self):
 
185
        """Derived from the Avahi example code"""
 
186
        self.remove()
 
187
        if self.group is None:
 
188
            self.group = dbus.Interface(
 
189
                self.bus.get_object(avahi.DBUS_NAME,
 
190
                                    self.server.EntryGroupNew()),
 
191
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
192
        self.entry_group_state_changed_match = (
 
193
            self.group.connect_to_signal(
 
194
                'StateChanged', self .entry_group_state_changed))
 
195
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
 
196
                     self.name, self.type)
 
197
        self.group.AddService(
 
198
            self.interface,
 
199
            self.protocol,
 
200
            dbus.UInt32(0),     # flags
 
201
            self.name, self.type,
 
202
            self.domain, self.host,
 
203
            dbus.UInt16(self.port),
 
204
            avahi.string_array_to_txt_array(self.TXT))
 
205
        self.group.Commit()
 
206
    def entry_group_state_changed(self, state, error):
 
207
        """Derived from the Avahi example code"""
 
208
        logger.debug("Avahi entry group state change: %i", state)
 
209
        
 
210
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
211
            logger.debug("Zeroconf service established.")
 
212
        elif state == avahi.ENTRY_GROUP_COLLISION:
 
213
            logger.info("Zeroconf service name collision.")
 
214
            self.rename()
 
215
        elif state == avahi.ENTRY_GROUP_FAILURE:
 
216
            logger.critical("Avahi: Error in group state changed %s",
 
217
                            unicode(error))
 
218
            raise AvahiGroupError("State changed: %s"
 
219
                                  % unicode(error))
 
220
    def cleanup(self):
 
221
        """Derived from the Avahi example code"""
 
222
        if self.group is not None:
 
223
            try:
 
224
                self.group.Free()
 
225
            except (dbus.exceptions.UnknownMethodException,
 
226
                    dbus.exceptions.DBusException) as e:
 
227
                pass
 
228
            self.group = None
 
229
        self.remove()
 
230
    def server_state_changed(self, state, error=None):
 
231
        """Derived from the Avahi example code"""
 
232
        logger.debug("Avahi server state change: %i", state)
 
233
        bad_states = { avahi.SERVER_INVALID:
 
234
                           "Zeroconf server invalid",
 
235
                       avahi.SERVER_REGISTERING: None,
 
236
                       avahi.SERVER_COLLISION:
 
237
                           "Zeroconf server name collision",
 
238
                       avahi.SERVER_FAILURE:
 
239
                           "Zeroconf server failure" }
 
240
        if state in bad_states:
 
241
            if bad_states[state] is not None:
 
242
                if error is None:
 
243
                    logger.error(bad_states[state])
 
244
                else:
 
245
                    logger.error(bad_states[state] + ": %r", error)
 
246
            self.cleanup()
 
247
        elif state == avahi.SERVER_RUNNING:
 
248
            self.add()
 
249
        else:
 
250
            if error is None:
 
251
                logger.debug("Unknown state: %r", state)
 
252
            else:
 
253
                logger.debug("Unknown state: %r: %r", state, error)
 
254
    def activate(self):
 
255
        """Derived from the Avahi example code"""
 
256
        if self.server is None:
 
257
            self.server = dbus.Interface(
 
258
                self.bus.get_object(avahi.DBUS_NAME,
 
259
                                    avahi.DBUS_PATH_SERVER,
 
260
                                    follow_name_owner_changes=True),
 
261
                avahi.DBUS_INTERFACE_SERVER)
 
262
        self.server.connect_to_signal("StateChanged",
 
263
                                 self.server_state_changed)
 
264
        self.server_state_changed(self.server.GetState())
54
265
 
55
266
 
56
267
class Client(object):
57
268
    """A representation of a client host served by this server.
 
269
    
58
270
    Attributes:
59
 
    name:      string; from the config file, used in log messages
 
271
    _approved:   bool(); 'None' if not yet approved/disapproved
 
272
    approval_delay: datetime.timedelta(); Time to wait for approval
 
273
    approval_duration: datetime.timedelta(); Duration of one approval
 
274
    checker:    subprocess.Popen(); a running checker process used
 
275
                                    to see if the client lives.
 
276
                                    'None' if no process is running.
 
277
    checker_callback_tag: a gobject event source tag, or None
 
278
    checker_command: string; External command which is run to check
 
279
                     if client lives.  %() expansions are done at
 
280
                     runtime with vars(self) as dict, so that for
 
281
                     instance %(name)s can be used in the command.
 
282
    checker_initiator_tag: a gobject event source tag, or None
 
283
    created:    datetime.datetime(); (UTC) object creation
 
284
    current_checker_command: string; current running checker_command
 
285
    disable_hook:  If set, called by disable() as disable_hook(self)
 
286
    disable_initiator_tag: a gobject event source tag, or None
 
287
    enabled:    bool()
60
288
    fingerprint: string (40 or 32 hexadecimal digits); used to
61
289
                 uniquely identify the client
62
 
    secret:    bytestring; sent verbatim (over TLS) to client
63
 
    fqdn:      string (FQDN); available for use by the checker command
64
 
    created:   datetime.datetime()
65
 
    last_seen: datetime.datetime() or None if not yet seen
66
 
    timeout:   datetime.timedelta(); How long from last_seen until
67
 
                                     this client is invalid
68
 
    interval:  datetime.timedelta(); How often to start a new checker
69
 
    stop_hook: If set, called by stop() as stop_hook(self)
70
 
    checker:   subprocess.Popen(); a running checker process used
71
 
                                   to see if the client lives.
72
 
                                   Is None if no process is running.
73
 
    checker_initiator_tag: a gobject event source tag, or None
74
 
    stop_initiator_tag:    - '' -
75
 
    checker_callback_tag:  - '' -
76
 
    checker_command: string; External command which is run to check if
77
 
                     client lives.  %()s expansions are done at
78
 
                     runtime with vars(self) as dict, so that for
79
 
                     instance %(name)s can be used in the command.
80
 
    Private attibutes:
81
 
    _timeout: Real variable for 'timeout'
82
 
    _interval: Real variable for 'interval'
83
 
    _timeout_milliseconds: Used by gobject.timeout_add()
84
 
    _interval_milliseconds: - '' -
 
290
    host:       string; available for use by the checker command
 
291
    interval:   datetime.timedelta(); How often to start a new checker
 
292
    last_approval_request: datetime.datetime(); (UTC) or None
 
293
    last_checked_ok: datetime.datetime(); (UTC) or None
 
294
    last_enabled: datetime.datetime(); (UTC)
 
295
    name:       string; from the config file, used in log messages and
 
296
                        D-Bus identifiers
 
297
    secret:     bytestring; sent verbatim (over TLS) to client
 
298
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
299
                                      until this client is disabled
 
300
    runtime_expansions: Allowed attributes for runtime expansion.
85
301
    """
86
 
    def _set_timeout(self, timeout):
87
 
        "Setter function for 'timeout' attribute"
88
 
        self._timeout = timeout
89
 
        self._timeout_milliseconds = ((self.timeout.days
90
 
                                       * 24 * 60 * 60 * 1000)
91
 
                                      + (self.timeout.seconds * 1000)
92
 
                                      + (self.timeout.microseconds
93
 
                                         // 1000))
94
 
    timeout = property(lambda self: self._timeout,
95
 
                       _set_timeout)
96
 
    del _set_timeout
97
 
    def _set_interval(self, interval):
98
 
        "Setter function for 'interval' attribute"
99
 
        self._interval = interval
100
 
        self._interval_milliseconds = ((self.interval.days
101
 
                                        * 24 * 60 * 60 * 1000)
102
 
                                       + (self.interval.seconds
103
 
                                          * 1000)
104
 
                                       + (self.interval.microseconds
105
 
                                          // 1000))
106
 
    interval = property(lambda self: self._interval,
107
 
                        _set_interval)
108
 
    del _set_interval
109
 
    def __init__(self, name=None, options=None, stop_hook=None,
110
 
                 fingerprint=None, secret=None, secfile=None, fqdn=None,
111
 
                 timeout=None, interval=-1, checker=None):
 
302
    
 
303
    runtime_expansions = ("approval_delay", "approval_duration",
 
304
                          "created", "enabled", "fingerprint",
 
305
                          "host", "interval", "last_checked_ok",
 
306
                          "last_enabled", "name", "timeout")
 
307
    
 
308
    @staticmethod
 
309
    def _timedelta_to_milliseconds(td):
 
310
        "Convert a datetime.timedelta() to milliseconds"
 
311
        return ((td.days * 24 * 60 * 60 * 1000)
 
312
                + (td.seconds * 1000)
 
313
                + (td.microseconds // 1000))
 
314
    
 
315
    def timeout_milliseconds(self):
 
316
        "Return the 'timeout' attribute in milliseconds"
 
317
        return self._timedelta_to_milliseconds(self.timeout)
 
318
    
 
319
    def interval_milliseconds(self):
 
320
        "Return the 'interval' attribute in milliseconds"
 
321
        return self._timedelta_to_milliseconds(self.interval)
 
322
 
 
323
    def approval_delay_milliseconds(self):
 
324
        return self._timedelta_to_milliseconds(self.approval_delay)
 
325
    
 
326
    def __init__(self, name = None, disable_hook=None, config=None):
 
327
        """Note: the 'checker' key in 'config' sets the
 
328
        'checker_command' attribute and *not* the 'checker'
 
329
        attribute."""
112
330
        self.name = name
113
 
        # Uppercase and remove spaces from fingerprint
114
 
        # for later comparison purposes with return value of
115
 
        # the fingerprint() function
116
 
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
117
 
        if secret:
118
 
            self.secret = secret.decode(u"base64")
119
 
        elif secfile:
120
 
            sf = open(secfile)
121
 
            self.secret = sf.read()
122
 
            sf.close()
123
 
        else:
124
 
            raise RuntimeError(u"No secret or secfile for client %s"
125
 
                               % self.name)
126
 
        self.fqdn = fqdn                # string
127
 
        self.created = datetime.datetime.now()
128
 
        self.last_seen = None
129
 
        if timeout is None:
130
 
            timeout = options.timeout
131
 
        self.timeout = timeout
132
 
        if interval == -1:
133
 
            interval = options.interval
134
 
        else:
135
 
            interval = string_to_delta(interval)
136
 
        self.interval = interval
137
 
        self.stop_hook = stop_hook
 
331
        if config is None:
 
332
            config = {}
 
333
        logger.debug("Creating client %r", self.name)
 
334
        # Uppercase and remove spaces from fingerprint for later
 
335
        # comparison purposes with return value from the fingerprint()
 
336
        # function
 
337
        self.fingerprint = (config["fingerprint"].upper()
 
338
                            .replace(" ", ""))
 
339
        logger.debug("  Fingerprint: %s", self.fingerprint)
 
340
        if "secret" in config:
 
341
            self.secret = config["secret"].decode("base64")
 
342
        elif "secfile" in config:
 
343
            with open(os.path.expanduser(os.path.expandvars
 
344
                                         (config["secfile"])),
 
345
                      "rb") as secfile:
 
346
                self.secret = secfile.read()
 
347
        else:
 
348
            raise TypeError("No secret or secfile for client %s"
 
349
                            % self.name)
 
350
        self.host = config.get("host", "")
 
351
        self.created = datetime.datetime.utcnow()
 
352
        self.enabled = False
 
353
        self.last_approval_request = None
 
354
        self.last_enabled = None
 
355
        self.last_checked_ok = None
 
356
        self.timeout = string_to_delta(config["timeout"])
 
357
        self.interval = string_to_delta(config["interval"])
 
358
        self.disable_hook = disable_hook
138
359
        self.checker = None
139
360
        self.checker_initiator_tag = None
140
 
        self.stop_initiator_tag = None
 
361
        self.disable_initiator_tag = None
141
362
        self.checker_callback_tag = None
142
 
        self.check_command = checker
143
 
    def start(self):
144
 
        """Start this clients checker and timeout hooks"""
 
363
        self.checker_command = config["checker"]
 
364
        self.current_checker_command = None
 
365
        self.last_connect = None
 
366
        self._approved = None
 
367
        self.approved_by_default = config.get("approved_by_default",
 
368
                                              True)
 
369
        self.approvals_pending = 0
 
370
        self.approval_delay = string_to_delta(
 
371
            config["approval_delay"])
 
372
        self.approval_duration = string_to_delta(
 
373
            config["approval_duration"])
 
374
        self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
 
375
    
 
376
    def send_changedstate(self):
 
377
        self.changedstate.acquire()
 
378
        self.changedstate.notify_all()
 
379
        self.changedstate.release()
 
380
        
 
381
    def enable(self):
 
382
        """Start this client's checker and timeout hooks"""
 
383
        if getattr(self, "enabled", False):
 
384
            # Already enabled
 
385
            return
 
386
        self.send_changedstate()
 
387
        self.last_enabled = datetime.datetime.utcnow()
145
388
        # Schedule a new checker to be started an 'interval' from now,
146
389
        # and every interval from then on.
147
 
        self.checker_initiator_tag = gobject.timeout_add\
148
 
                                     (self._interval_milliseconds,
149
 
                                      self.start_checker)
 
390
        self.checker_initiator_tag = (gobject.timeout_add
 
391
                                      (self.interval_milliseconds(),
 
392
                                       self.start_checker))
 
393
        # Schedule a disable() when 'timeout' has passed
 
394
        self.disable_initiator_tag = (gobject.timeout_add
 
395
                                   (self.timeout_milliseconds(),
 
396
                                    self.disable))
 
397
        self.enabled = True
150
398
        # Also start a new checker *right now*.
151
399
        self.start_checker()
152
 
        # Schedule a stop() when 'timeout' has passed
153
 
        self.stop_initiator_tag = gobject.timeout_add\
154
 
                                  (self._timeout_milliseconds,
155
 
                                   self.stop)
156
 
    def stop(self):
157
 
        """Stop this client.
158
 
        The possibility that this client might be restarted is left
159
 
        open, but not currently used."""
160
 
        logger.debug(u"Stopping client %s", self.name)
161
 
        self.secret = None
162
 
        if self.stop_initiator_tag:
163
 
            gobject.source_remove(self.stop_initiator_tag)
164
 
            self.stop_initiator_tag = None
165
 
        if self.checker_initiator_tag:
 
400
    
 
401
    def disable(self, quiet=True):
 
402
        """Disable this client."""
 
403
        if not getattr(self, "enabled", False):
 
404
            return False
 
405
        if not quiet:
 
406
            self.send_changedstate()
 
407
        if not quiet:
 
408
            logger.info("Disabling client %s", self.name)
 
409
        if getattr(self, "disable_initiator_tag", False):
 
410
            gobject.source_remove(self.disable_initiator_tag)
 
411
            self.disable_initiator_tag = None
 
412
        if getattr(self, "checker_initiator_tag", False):
166
413
            gobject.source_remove(self.checker_initiator_tag)
167
414
            self.checker_initiator_tag = None
168
415
        self.stop_checker()
169
 
        if self.stop_hook:
170
 
            self.stop_hook(self)
 
416
        if self.disable_hook:
 
417
            self.disable_hook(self)
 
418
        self.enabled = False
171
419
        # Do not run this again if called by a gobject.timeout_add
172
420
        return False
 
421
    
173
422
    def __del__(self):
174
 
        # Some code duplication here and in stop()
175
 
        if hasattr(self, "stop_initiator_tag") \
176
 
               and self.stop_initiator_tag:
177
 
            gobject.source_remove(self.stop_initiator_tag)
178
 
            self.stop_initiator_tag = None
179
 
        if hasattr(self, "checker_initiator_tag") \
180
 
               and self.checker_initiator_tag:
181
 
            gobject.source_remove(self.checker_initiator_tag)
182
 
            self.checker_initiator_tag = None
183
 
        self.stop_checker()
184
 
    def checker_callback(self, pid, condition):
 
423
        self.disable_hook = None
 
424
        self.disable()
 
425
    
 
426
    def checker_callback(self, pid, condition, command):
185
427
        """The checker has completed, so take appropriate actions."""
186
 
        now = datetime.datetime.now()
187
 
        if os.WIFEXITED(condition) \
188
 
               and (os.WEXITSTATUS(condition) == 0):
189
 
            logger.debug(u"Checker for %(name)s succeeded",
190
 
                         vars(self))
191
 
            self.last_seen = now
192
 
            gobject.source_remove(self.stop_initiator_tag)
193
 
            self.stop_initiator_tag = gobject.timeout_add\
194
 
                                      (self._timeout_milliseconds,
195
 
                                       self.stop)
196
 
        if not os.WIFEXITED(condition):
197
 
            logger.warning(u"Checker for %(name)s crashed?",
 
428
        self.checker_callback_tag = None
 
429
        self.checker = None
 
430
        if os.WIFEXITED(condition):
 
431
            exitstatus = os.WEXITSTATUS(condition)
 
432
            if exitstatus == 0:
 
433
                logger.info("Checker for %(name)s succeeded",
 
434
                            vars(self))
 
435
                self.checked_ok()
 
436
            else:
 
437
                logger.info("Checker for %(name)s failed",
 
438
                            vars(self))
 
439
        else:
 
440
            logger.warning("Checker for %(name)s crashed?",
198
441
                           vars(self))
199
 
        else:
200
 
            logger.debug(u"Checker for %(name)s failed",
201
 
                         vars(self))
202
 
            self.checker = None
203
 
        self.checker_callback_tag = None
 
442
    
 
443
    def checked_ok(self):
 
444
        """Bump up the timeout for this client.
 
445
        
 
446
        This should only be called when the client has been seen,
 
447
        alive and well.
 
448
        """
 
449
        self.last_checked_ok = datetime.datetime.utcnow()
 
450
        gobject.source_remove(self.disable_initiator_tag)
 
451
        self.disable_initiator_tag = (gobject.timeout_add
 
452
                                      (self.timeout_milliseconds(),
 
453
                                       self.disable))
 
454
    
 
455
    def need_approval(self):
 
456
        self.last_approval_request = datetime.datetime.utcnow()
 
457
    
204
458
    def start_checker(self):
205
459
        """Start a new checker subprocess if one is not running.
 
460
        
206
461
        If a checker already exists, leave it running and do
207
462
        nothing."""
 
463
        # The reason for not killing a running checker is that if we
 
464
        # did that, then if a checker (for some reason) started
 
465
        # running slowly and taking more than 'interval' time, the
 
466
        # client would inevitably timeout, since no checker would get
 
467
        # a chance to run to completion.  If we instead leave running
 
468
        # checkers alone, the checker would have to take more time
 
469
        # than 'timeout' for the client to be disabled, which is as it
 
470
        # should be.
 
471
        
 
472
        # If a checker exists, make sure it is not a zombie
 
473
        try:
 
474
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
475
        except (AttributeError, OSError) as error:
 
476
            if (isinstance(error, OSError)
 
477
                and error.errno != errno.ECHILD):
 
478
                raise error
 
479
        else:
 
480
            if pid:
 
481
                logger.warning("Checker was a zombie")
 
482
                gobject.source_remove(self.checker_callback_tag)
 
483
                self.checker_callback(pid, status,
 
484
                                      self.current_checker_command)
 
485
        # Start a new checker if needed
208
486
        if self.checker is None:
209
 
            logger.debug(u"Starting checker for %s",
210
 
                         self.name)
211
487
            try:
212
 
                command = self.check_command % self.fqdn
 
488
                # In case checker_command has exactly one % operator
 
489
                command = self.checker_command % self.host
213
490
            except TypeError:
214
 
                escaped_attrs = dict((key, re.escape(str(val)))
215
 
                                     for key, val in
216
 
                                     vars(self).iteritems())
 
491
                # Escape attributes for the shell
 
492
                escaped_attrs = dict(
 
493
                    (attr,
 
494
                     re.escape(unicode(str(getattr(self, attr, "")),
 
495
                                       errors=
 
496
                                       'replace')))
 
497
                    for attr in
 
498
                    self.runtime_expansions)
 
499
 
217
500
                try:
218
 
                    command = self.check_command % escaped_attrs
219
 
                except TypeError, error:
220
 
                    logger.critical(u'Could not format string "%s": %s',
221
 
                                    self.check_command, error)
 
501
                    command = self.checker_command % escaped_attrs
 
502
                except TypeError as error:
 
503
                    logger.error('Could not format string "%s":'
 
504
                                 ' %s', self.checker_command, error)
222
505
                    return True # Try again later
 
506
            self.current_checker_command = command
223
507
            try:
224
 
                self.checker = subprocess.\
225
 
                               Popen(command,
226
 
                                     stdout=subprocess.PIPE,
227
 
                                     close_fds=True, shell=True,
228
 
                                     cwd="/")
229
 
                self.checker_callback_tag = gobject.\
230
 
                                            child_watch_add(self.checker.pid,
231
 
                                                            self.\
232
 
                                                            checker_callback)
233
 
            except subprocess.OSError, error:
234
 
                logger.error(u"Failed to start subprocess: %s",
 
508
                logger.info("Starting checker %r for %s",
 
509
                            command, self.name)
 
510
                # We don't need to redirect stdout and stderr, since
 
511
                # in normal mode, that is already done by daemon(),
 
512
                # and in debug mode we don't want to.  (Stdin is
 
513
                # always replaced by /dev/null.)
 
514
                self.checker = subprocess.Popen(command,
 
515
                                                close_fds=True,
 
516
                                                shell=True, cwd="/")
 
517
                self.checker_callback_tag = (gobject.child_watch_add
 
518
                                             (self.checker.pid,
 
519
                                              self.checker_callback,
 
520
                                              data=command))
 
521
                # The checker may have completed before the gobject
 
522
                # watch was added.  Check for this.
 
523
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
524
                if pid:
 
525
                    gobject.source_remove(self.checker_callback_tag)
 
526
                    self.checker_callback(pid, status, command)
 
527
            except OSError as error:
 
528
                logger.error("Failed to start subprocess: %s",
235
529
                             error)
236
530
        # Re-run this periodically if run by gobject.timeout_add
237
531
        return True
 
532
    
238
533
    def stop_checker(self):
239
534
        """Force the checker process, if any, to stop."""
240
 
        if not hasattr(self, "checker") or self.checker is None:
 
535
        if self.checker_callback_tag:
 
536
            gobject.source_remove(self.checker_callback_tag)
 
537
            self.checker_callback_tag = None
 
538
        if getattr(self, "checker", None) is None:
241
539
            return
242
 
        gobject.source_remove(self.checker_callback_tag)
 
540
        logger.debug("Stopping checker for %(name)s", vars(self))
 
541
        try:
 
542
            os.kill(self.checker.pid, signal.SIGTERM)
 
543
            #time.sleep(0.5)
 
544
            #if self.checker.poll() is None:
 
545
            #    os.kill(self.checker.pid, signal.SIGKILL)
 
546
        except OSError as error:
 
547
            if error.errno != errno.ESRCH: # No such process
 
548
                raise
 
549
        self.checker = None
 
550
 
 
551
def dbus_service_property(dbus_interface, signature="v",
 
552
                          access="readwrite", byte_arrays=False):
 
553
    """Decorators for marking methods of a DBusObjectWithProperties to
 
554
    become properties on the D-Bus.
 
555
    
 
556
    The decorated method will be called with no arguments by "Get"
 
557
    and with one argument by "Set".
 
558
    
 
559
    The parameters, where they are supported, are the same as
 
560
    dbus.service.method, except there is only "signature", since the
 
561
    type from Get() and the type sent to Set() is the same.
 
562
    """
 
563
    # Encoding deeply encoded byte arrays is not supported yet by the
 
564
    # "Set" method, so we fail early here:
 
565
    if byte_arrays and signature != "ay":
 
566
        raise ValueError("Byte arrays not supported for non-'ay'"
 
567
                         " signature %r" % signature)
 
568
    def decorator(func):
 
569
        func._dbus_is_property = True
 
570
        func._dbus_interface = dbus_interface
 
571
        func._dbus_signature = signature
 
572
        func._dbus_access = access
 
573
        func._dbus_name = func.__name__
 
574
        if func._dbus_name.endswith("_dbus_property"):
 
575
            func._dbus_name = func._dbus_name[:-14]
 
576
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
 
577
        return func
 
578
    return decorator
 
579
 
 
580
 
 
581
class DBusPropertyException(dbus.exceptions.DBusException):
 
582
    """A base class for D-Bus property-related exceptions
 
583
    """
 
584
    def __unicode__(self):
 
585
        return unicode(str(self))
 
586
 
 
587
 
 
588
class DBusPropertyAccessException(DBusPropertyException):
 
589
    """A property's access permissions disallows an operation.
 
590
    """
 
591
    pass
 
592
 
 
593
 
 
594
class DBusPropertyNotFound(DBusPropertyException):
 
595
    """An attempt was made to access a non-existing property.
 
596
    """
 
597
    pass
 
598
 
 
599
 
 
600
class DBusObjectWithProperties(dbus.service.Object):
 
601
    """A D-Bus object with properties.
 
602
 
 
603
    Classes inheriting from this can use the dbus_service_property
 
604
    decorator to expose methods as D-Bus properties.  It exposes the
 
605
    standard Get(), Set(), and GetAll() methods on the D-Bus.
 
606
    """
 
607
    
 
608
    @staticmethod
 
609
    def _is_dbus_property(obj):
 
610
        return getattr(obj, "_dbus_is_property", False)
 
611
    
 
612
    def _get_all_dbus_properties(self):
 
613
        """Returns a generator of (name, attribute) pairs
 
614
        """
 
615
        return ((prop._dbus_name, prop)
 
616
                for name, prop in
 
617
                inspect.getmembers(self, self._is_dbus_property))
 
618
    
 
619
    def _get_dbus_property(self, interface_name, property_name):
 
620
        """Returns a bound method if one exists which is a D-Bus
 
621
        property with the specified name and interface.
 
622
        """
 
623
        for name in (property_name,
 
624
                     property_name + "_dbus_property"):
 
625
            prop = getattr(self, name, None)
 
626
            if (prop is None
 
627
                or not self._is_dbus_property(prop)
 
628
                or prop._dbus_name != property_name
 
629
                or (interface_name and prop._dbus_interface
 
630
                    and interface_name != prop._dbus_interface)):
 
631
                continue
 
632
            return prop
 
633
        # No such property
 
634
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
 
635
                                   + interface_name + "."
 
636
                                   + property_name)
 
637
    
 
638
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
 
639
                         out_signature="v")
 
640
    def Get(self, interface_name, property_name):
 
641
        """Standard D-Bus property Get() method, see D-Bus standard.
 
642
        """
 
643
        prop = self._get_dbus_property(interface_name, property_name)
 
644
        if prop._dbus_access == "write":
 
645
            raise DBusPropertyAccessException(property_name)
 
646
        value = prop()
 
647
        if not hasattr(value, "variant_level"):
 
648
            return value
 
649
        return type(value)(value, variant_level=value.variant_level+1)
 
650
    
 
651
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
 
652
    def Set(self, interface_name, property_name, value):
 
653
        """Standard D-Bus property Set() method, see D-Bus standard.
 
654
        """
 
655
        prop = self._get_dbus_property(interface_name, property_name)
 
656
        if prop._dbus_access == "read":
 
657
            raise DBusPropertyAccessException(property_name)
 
658
        if prop._dbus_get_args_options["byte_arrays"]:
 
659
            # The byte_arrays option is not supported yet on
 
660
            # signatures other than "ay".
 
661
            if prop._dbus_signature != "ay":
 
662
                raise ValueError
 
663
            value = dbus.ByteArray(''.join(unichr(byte)
 
664
                                           for byte in value))
 
665
        prop(value)
 
666
    
 
667
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
 
668
                         out_signature="a{sv}")
 
669
    def GetAll(self, interface_name):
 
670
        """Standard D-Bus property GetAll() method, see D-Bus
 
671
        standard.
 
672
 
 
673
        Note: Will not include properties with access="write".
 
674
        """
 
675
        all = {}
 
676
        for name, prop in self._get_all_dbus_properties():
 
677
            if (interface_name
 
678
                and interface_name != prop._dbus_interface):
 
679
                # Interface non-empty but did not match
 
680
                continue
 
681
            # Ignore write-only properties
 
682
            if prop._dbus_access == "write":
 
683
                continue
 
684
            value = prop()
 
685
            if not hasattr(value, "variant_level"):
 
686
                all[name] = value
 
687
                continue
 
688
            all[name] = type(value)(value, variant_level=
 
689
                                    value.variant_level+1)
 
690
        return dbus.Dictionary(all, signature="sv")
 
691
    
 
692
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
693
                         out_signature="s",
 
694
                         path_keyword='object_path',
 
695
                         connection_keyword='connection')
 
696
    def Introspect(self, object_path, connection):
 
697
        """Standard D-Bus method, overloaded to insert property tags.
 
698
        """
 
699
        xmlstring = dbus.service.Object.Introspect(self, object_path,
 
700
                                                   connection)
 
701
        try:
 
702
            document = xml.dom.minidom.parseString(xmlstring)
 
703
            def make_tag(document, name, prop):
 
704
                e = document.createElement("property")
 
705
                e.setAttribute("name", name)
 
706
                e.setAttribute("type", prop._dbus_signature)
 
707
                e.setAttribute("access", prop._dbus_access)
 
708
                return e
 
709
            for if_tag in document.getElementsByTagName("interface"):
 
710
                for tag in (make_tag(document, name, prop)
 
711
                            for name, prop
 
712
                            in self._get_all_dbus_properties()
 
713
                            if prop._dbus_interface
 
714
                            == if_tag.getAttribute("name")):
 
715
                    if_tag.appendChild(tag)
 
716
                # Add the names to the return values for the
 
717
                # "org.freedesktop.DBus.Properties" methods
 
718
                if (if_tag.getAttribute("name")
 
719
                    == "org.freedesktop.DBus.Properties"):
 
720
                    for cn in if_tag.getElementsByTagName("method"):
 
721
                        if cn.getAttribute("name") == "Get":
 
722
                            for arg in cn.getElementsByTagName("arg"):
 
723
                                if (arg.getAttribute("direction")
 
724
                                    == "out"):
 
725
                                    arg.setAttribute("name", "value")
 
726
                        elif cn.getAttribute("name") == "GetAll":
 
727
                            for arg in cn.getElementsByTagName("arg"):
 
728
                                if (arg.getAttribute("direction")
 
729
                                    == "out"):
 
730
                                    arg.setAttribute("name", "props")
 
731
            xmlstring = document.toxml("utf-8")
 
732
            document.unlink()
 
733
        except (AttributeError, xml.dom.DOMException,
 
734
                xml.parsers.expat.ExpatError) as error:
 
735
            logger.error("Failed to override Introspection method",
 
736
                         error)
 
737
        return xmlstring
 
738
 
 
739
 
 
740
class ClientDBus(Client, DBusObjectWithProperties):
 
741
    """A Client class using D-Bus
 
742
    
 
743
    Attributes:
 
744
    dbus_object_path: dbus.ObjectPath
 
745
    bus: dbus.SystemBus()
 
746
    """
 
747
    
 
748
    runtime_expansions = (Client.runtime_expansions
 
749
                          + ("dbus_object_path",))
 
750
    
 
751
    # dbus.service.Object doesn't use super(), so we can't either.
 
752
    
 
753
    def __init__(self, bus = None, *args, **kwargs):
 
754
        self._approvals_pending = 0
 
755
        self.bus = bus
 
756
        Client.__init__(self, *args, **kwargs)
 
757
        # Only now, when this client is initialized, can it show up on
 
758
        # the D-Bus
 
759
        client_object_name = unicode(self.name).translate(
 
760
            {ord("."): ord("_"),
 
761
             ord("-"): ord("_")})
 
762
        self.dbus_object_path = (dbus.ObjectPath
 
763
                                 ("/clients/" + client_object_name))
 
764
        DBusObjectWithProperties.__init__(self, self.bus,
 
765
                                          self.dbus_object_path)
 
766
        
 
767
    def _get_approvals_pending(self):
 
768
        return self._approvals_pending
 
769
    def _set_approvals_pending(self, value):
 
770
        old_value = self._approvals_pending
 
771
        self._approvals_pending = value
 
772
        bval = bool(value)
 
773
        if (hasattr(self, "dbus_object_path")
 
774
            and bval is not bool(old_value)):
 
775
            dbus_bool = dbus.Boolean(bval, variant_level=1)
 
776
            self.PropertyChanged(dbus.String("ApprovalPending"),
 
777
                                 dbus_bool)
 
778
 
 
779
    approvals_pending = property(_get_approvals_pending,
 
780
                                 _set_approvals_pending)
 
781
    del _get_approvals_pending, _set_approvals_pending
 
782
    
 
783
    @staticmethod
 
784
    def _datetime_to_dbus(dt, variant_level=0):
 
785
        """Convert a UTC datetime.datetime() to a D-Bus type."""
 
786
        return dbus.String(dt.isoformat(),
 
787
                           variant_level=variant_level)
 
788
    
 
789
    def enable(self):
 
790
        oldstate = getattr(self, "enabled", False)
 
791
        r = Client.enable(self)
 
792
        if oldstate != self.enabled:
 
793
            # Emit D-Bus signals
 
794
            self.PropertyChanged(dbus.String("Enabled"),
 
795
                                 dbus.Boolean(True, variant_level=1))
 
796
            self.PropertyChanged(
 
797
                dbus.String("LastEnabled"),
 
798
                self._datetime_to_dbus(self.last_enabled,
 
799
                                       variant_level=1))
 
800
        return r
 
801
    
 
802
    def disable(self, quiet = False):
 
803
        oldstate = getattr(self, "enabled", False)
 
804
        r = Client.disable(self, quiet=quiet)
 
805
        if not quiet and oldstate != self.enabled:
 
806
            # Emit D-Bus signal
 
807
            self.PropertyChanged(dbus.String("Enabled"),
 
808
                                 dbus.Boolean(False, variant_level=1))
 
809
        return r
 
810
    
 
811
    def __del__(self, *args, **kwargs):
 
812
        try:
 
813
            self.remove_from_connection()
 
814
        except LookupError:
 
815
            pass
 
816
        if hasattr(DBusObjectWithProperties, "__del__"):
 
817
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
 
818
        Client.__del__(self, *args, **kwargs)
 
819
    
 
820
    def checker_callback(self, pid, condition, command,
 
821
                         *args, **kwargs):
243
822
        self.checker_callback_tag = None
244
 
        os.kill(self.checker.pid, signal.SIGTERM)
245
 
        if self.checker.poll() is None:
246
 
            os.kill(self.checker.pid, signal.SIGKILL)
247
823
        self.checker = None
248
 
    def still_valid(self, now=None):
249
 
        """Has the timeout not yet passed for this client?"""
250
 
        if now is None:
251
 
            now = datetime.datetime.now()
252
 
        if self.last_seen is None:
253
 
            return now < (self.created + self.timeout)
254
 
        else:
255
 
            return now < (self.last_seen + self.timeout)
256
 
 
257
 
 
258
 
def peer_certificate(session):
259
 
    # If not an OpenPGP certificate...
260
 
    if gnutls.library.functions.gnutls_certificate_type_get\
261
 
            (session._c_object) \
262
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
263
 
        # ...do the normal thing
264
 
        return session.peer_certificate
265
 
    list_size = ctypes.c_uint()
266
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
267
 
        (session._c_object, ctypes.byref(list_size))
268
 
    if list_size.value == 0:
269
 
        return None
270
 
    cert = cert_list[0]
271
 
    return ctypes.string_at(cert.data, cert.size)
272
 
 
273
 
 
274
 
def fingerprint(openpgp):
275
 
    # New empty GnuTLS certificate
276
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
277
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
278
 
        (ctypes.byref(crt))
279
 
    # New GnuTLS "datum" with the OpenPGP public key
280
 
    datum = gnutls.library.types.gnutls_datum_t\
281
 
        (ctypes.cast(ctypes.c_char_p(openpgp),
282
 
                     ctypes.POINTER(ctypes.c_ubyte)),
283
 
         ctypes.c_uint(len(openpgp)))
284
 
    # Import the OpenPGP public key into the certificate
285
 
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
286
 
        (crt,
287
 
         ctypes.byref(datum),
288
 
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
289
 
    # New buffer for the fingerprint
290
 
    buffer = ctypes.create_string_buffer(20)
291
 
    buffer_length = ctypes.c_size_t()
292
 
    # Get the fingerprint from the certificate into the buffer
293
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
294
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
295
 
    # Deinit the certificate
296
 
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
297
 
    # Convert the buffer to a Python bytestring
298
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
299
 
    # Convert the bytestring to hexadecimal notation
300
 
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
301
 
    return hex_fpr
302
 
 
303
 
 
304
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
305
 
    """A TCP request handler class.
306
 
    Instantiated by IPv6_TCPServer for each request to handle it.
 
824
        # Emit D-Bus signal
 
825
        self.PropertyChanged(dbus.String("CheckerRunning"),
 
826
                             dbus.Boolean(False, variant_level=1))
 
827
        if os.WIFEXITED(condition):
 
828
            exitstatus = os.WEXITSTATUS(condition)
 
829
            # Emit D-Bus signal
 
830
            self.CheckerCompleted(dbus.Int16(exitstatus),
 
831
                                  dbus.Int64(condition),
 
832
                                  dbus.String(command))
 
833
        else:
 
834
            # Emit D-Bus signal
 
835
            self.CheckerCompleted(dbus.Int16(-1),
 
836
                                  dbus.Int64(condition),
 
837
                                  dbus.String(command))
 
838
        
 
839
        return Client.checker_callback(self, pid, condition, command,
 
840
                                       *args, **kwargs)
 
841
    
 
842
    def checked_ok(self, *args, **kwargs):
 
843
        Client.checked_ok(self, *args, **kwargs)
 
844
        # Emit D-Bus signal
 
845
        self.PropertyChanged(
 
846
            dbus.String("LastCheckedOK"),
 
847
            (self._datetime_to_dbus(self.last_checked_ok,
 
848
                                    variant_level=1)))
 
849
    
 
850
    def need_approval(self, *args, **kwargs):
 
851
        r = Client.need_approval(self, *args, **kwargs)
 
852
        # Emit D-Bus signal
 
853
        self.PropertyChanged(
 
854
            dbus.String("LastApprovalRequest"),
 
855
            (self._datetime_to_dbus(self.last_approval_request,
 
856
                                    variant_level=1)))
 
857
        return r
 
858
    
 
859
    def start_checker(self, *args, **kwargs):
 
860
        old_checker = self.checker
 
861
        if self.checker is not None:
 
862
            old_checker_pid = self.checker.pid
 
863
        else:
 
864
            old_checker_pid = None
 
865
        r = Client.start_checker(self, *args, **kwargs)
 
866
        # Only if new checker process was started
 
867
        if (self.checker is not None
 
868
            and old_checker_pid != self.checker.pid):
 
869
            # Emit D-Bus signal
 
870
            self.CheckerStarted(self.current_checker_command)
 
871
            self.PropertyChanged(
 
872
                dbus.String("CheckerRunning"),
 
873
                dbus.Boolean(True, variant_level=1))
 
874
        return r
 
875
    
 
876
    def stop_checker(self, *args, **kwargs):
 
877
        old_checker = getattr(self, "checker", None)
 
878
        r = Client.stop_checker(self, *args, **kwargs)
 
879
        if (old_checker is not None
 
880
            and getattr(self, "checker", None) is None):
 
881
            self.PropertyChanged(dbus.String("CheckerRunning"),
 
882
                                 dbus.Boolean(False, variant_level=1))
 
883
        return r
 
884
 
 
885
    def _reset_approved(self):
 
886
        self._approved = None
 
887
        return False
 
888
    
 
889
    def approve(self, value=True):
 
890
        self.send_changedstate()
 
891
        self._approved = value
 
892
        gobject.timeout_add(self._timedelta_to_milliseconds
 
893
                            (self.approval_duration),
 
894
                            self._reset_approved)
 
895
    
 
896
    
 
897
    ## D-Bus methods, signals & properties
 
898
    _interface = "se.bsnet.fukt.Mandos.Client"
 
899
    
 
900
    ## Signals
 
901
    
 
902
    # CheckerCompleted - signal
 
903
    @dbus.service.signal(_interface, signature="nxs")
 
904
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
905
        "D-Bus signal"
 
906
        pass
 
907
    
 
908
    # CheckerStarted - signal
 
909
    @dbus.service.signal(_interface, signature="s")
 
910
    def CheckerStarted(self, command):
 
911
        "D-Bus signal"
 
912
        pass
 
913
    
 
914
    # PropertyChanged - signal
 
915
    @dbus.service.signal(_interface, signature="sv")
 
916
    def PropertyChanged(self, property, value):
 
917
        "D-Bus signal"
 
918
        pass
 
919
    
 
920
    # GotSecret - signal
 
921
    @dbus.service.signal(_interface)
 
922
    def GotSecret(self):
 
923
        """D-Bus signal
 
924
        Is sent after a successful transfer of secret from the Mandos
 
925
        server to mandos-client
 
926
        """
 
927
        pass
 
928
    
 
929
    # Rejected - signal
 
930
    @dbus.service.signal(_interface, signature="s")
 
931
    def Rejected(self, reason):
 
932
        "D-Bus signal"
 
933
        pass
 
934
    
 
935
    # NeedApproval - signal
 
936
    @dbus.service.signal(_interface, signature="tb")
 
937
    def NeedApproval(self, timeout, default):
 
938
        "D-Bus signal"
 
939
        return self.need_approval()
 
940
    
 
941
    ## Methods
 
942
    
 
943
    # Approve - method
 
944
    @dbus.service.method(_interface, in_signature="b")
 
945
    def Approve(self, value):
 
946
        self.approve(value)
 
947
    
 
948
    # CheckedOK - method
 
949
    @dbus.service.method(_interface)
 
950
    def CheckedOK(self):
 
951
        self.checked_ok()
 
952
    
 
953
    # Enable - method
 
954
    @dbus.service.method(_interface)
 
955
    def Enable(self):
 
956
        "D-Bus method"
 
957
        self.enable()
 
958
    
 
959
    # StartChecker - method
 
960
    @dbus.service.method(_interface)
 
961
    def StartChecker(self):
 
962
        "D-Bus method"
 
963
        self.start_checker()
 
964
    
 
965
    # Disable - method
 
966
    @dbus.service.method(_interface)
 
967
    def Disable(self):
 
968
        "D-Bus method"
 
969
        self.disable()
 
970
    
 
971
    # StopChecker - method
 
972
    @dbus.service.method(_interface)
 
973
    def StopChecker(self):
 
974
        self.stop_checker()
 
975
    
 
976
    ## Properties
 
977
    
 
978
    # ApprovalPending - property
 
979
    @dbus_service_property(_interface, signature="b", access="read")
 
980
    def ApprovalPending_dbus_property(self):
 
981
        return dbus.Boolean(bool(self.approvals_pending))
 
982
    
 
983
    # ApprovedByDefault - property
 
984
    @dbus_service_property(_interface, signature="b",
 
985
                           access="readwrite")
 
986
    def ApprovedByDefault_dbus_property(self, value=None):
 
987
        if value is None:       # get
 
988
            return dbus.Boolean(self.approved_by_default)
 
989
        self.approved_by_default = bool(value)
 
990
        # Emit D-Bus signal
 
991
        self.PropertyChanged(dbus.String("ApprovedByDefault"),
 
992
                             dbus.Boolean(value, variant_level=1))
 
993
    
 
994
    # ApprovalDelay - property
 
995
    @dbus_service_property(_interface, signature="t",
 
996
                           access="readwrite")
 
997
    def ApprovalDelay_dbus_property(self, value=None):
 
998
        if value is None:       # get
 
999
            return dbus.UInt64(self.approval_delay_milliseconds())
 
1000
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
 
1001
        # Emit D-Bus signal
 
1002
        self.PropertyChanged(dbus.String("ApprovalDelay"),
 
1003
                             dbus.UInt64(value, variant_level=1))
 
1004
    
 
1005
    # ApprovalDuration - property
 
1006
    @dbus_service_property(_interface, signature="t",
 
1007
                           access="readwrite")
 
1008
    def ApprovalDuration_dbus_property(self, value=None):
 
1009
        if value is None:       # get
 
1010
            return dbus.UInt64(self._timedelta_to_milliseconds(
 
1011
                    self.approval_duration))
 
1012
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
 
1013
        # Emit D-Bus signal
 
1014
        self.PropertyChanged(dbus.String("ApprovalDuration"),
 
1015
                             dbus.UInt64(value, variant_level=1))
 
1016
    
 
1017
    # Name - property
 
1018
    @dbus_service_property(_interface, signature="s", access="read")
 
1019
    def Name_dbus_property(self):
 
1020
        return dbus.String(self.name)
 
1021
    
 
1022
    # Fingerprint - property
 
1023
    @dbus_service_property(_interface, signature="s", access="read")
 
1024
    def Fingerprint_dbus_property(self):
 
1025
        return dbus.String(self.fingerprint)
 
1026
    
 
1027
    # Host - property
 
1028
    @dbus_service_property(_interface, signature="s",
 
1029
                           access="readwrite")
 
1030
    def Host_dbus_property(self, value=None):
 
1031
        if value is None:       # get
 
1032
            return dbus.String(self.host)
 
1033
        self.host = value
 
1034
        # Emit D-Bus signal
 
1035
        self.PropertyChanged(dbus.String("Host"),
 
1036
                             dbus.String(value, variant_level=1))
 
1037
    
 
1038
    # Created - property
 
1039
    @dbus_service_property(_interface, signature="s", access="read")
 
1040
    def Created_dbus_property(self):
 
1041
        return dbus.String(self._datetime_to_dbus(self.created))
 
1042
    
 
1043
    # LastEnabled - property
 
1044
    @dbus_service_property(_interface, signature="s", access="read")
 
1045
    def LastEnabled_dbus_property(self):
 
1046
        if self.last_enabled is None:
 
1047
            return dbus.String("")
 
1048
        return dbus.String(self._datetime_to_dbus(self.last_enabled))
 
1049
    
 
1050
    # Enabled - property
 
1051
    @dbus_service_property(_interface, signature="b",
 
1052
                           access="readwrite")
 
1053
    def Enabled_dbus_property(self, value=None):
 
1054
        if value is None:       # get
 
1055
            return dbus.Boolean(self.enabled)
 
1056
        if value:
 
1057
            self.enable()
 
1058
        else:
 
1059
            self.disable()
 
1060
    
 
1061
    # LastCheckedOK - property
 
1062
    @dbus_service_property(_interface, signature="s",
 
1063
                           access="readwrite")
 
1064
    def LastCheckedOK_dbus_property(self, value=None):
 
1065
        if value is not None:
 
1066
            self.checked_ok()
 
1067
            return
 
1068
        if self.last_checked_ok is None:
 
1069
            return dbus.String("")
 
1070
        return dbus.String(self._datetime_to_dbus(self
 
1071
                                                  .last_checked_ok))
 
1072
    
 
1073
    # LastApprovalRequest - property
 
1074
    @dbus_service_property(_interface, signature="s", access="read")
 
1075
    def LastApprovalRequest_dbus_property(self):
 
1076
        if self.last_approval_request is None:
 
1077
            return dbus.String("")
 
1078
        return dbus.String(self.
 
1079
                           _datetime_to_dbus(self
 
1080
                                             .last_approval_request))
 
1081
    
 
1082
    # Timeout - property
 
1083
    @dbus_service_property(_interface, signature="t",
 
1084
                           access="readwrite")
 
1085
    def Timeout_dbus_property(self, value=None):
 
1086
        if value is None:       # get
 
1087
            return dbus.UInt64(self.timeout_milliseconds())
 
1088
        self.timeout = datetime.timedelta(0, 0, 0, value)
 
1089
        # Emit D-Bus signal
 
1090
        self.PropertyChanged(dbus.String("Timeout"),
 
1091
                             dbus.UInt64(value, variant_level=1))
 
1092
        if getattr(self, "disable_initiator_tag", None) is None:
 
1093
            return
 
1094
        # Reschedule timeout
 
1095
        gobject.source_remove(self.disable_initiator_tag)
 
1096
        self.disable_initiator_tag = None
 
1097
        time_to_die = (self.
 
1098
                       _timedelta_to_milliseconds((self
 
1099
                                                   .last_checked_ok
 
1100
                                                   + self.timeout)
 
1101
                                                  - datetime.datetime
 
1102
                                                  .utcnow()))
 
1103
        if time_to_die <= 0:
 
1104
            # The timeout has passed
 
1105
            self.disable()
 
1106
        else:
 
1107
            self.disable_initiator_tag = (gobject.timeout_add
 
1108
                                          (time_to_die, self.disable))
 
1109
    
 
1110
    # Interval - property
 
1111
    @dbus_service_property(_interface, signature="t",
 
1112
                           access="readwrite")
 
1113
    def Interval_dbus_property(self, value=None):
 
1114
        if value is None:       # get
 
1115
            return dbus.UInt64(self.interval_milliseconds())
 
1116
        self.interval = datetime.timedelta(0, 0, 0, value)
 
1117
        # Emit D-Bus signal
 
1118
        self.PropertyChanged(dbus.String("Interval"),
 
1119
                             dbus.UInt64(value, variant_level=1))
 
1120
        if getattr(self, "checker_initiator_tag", None) is None:
 
1121
            return
 
1122
        # Reschedule checker run
 
1123
        gobject.source_remove(self.checker_initiator_tag)
 
1124
        self.checker_initiator_tag = (gobject.timeout_add
 
1125
                                      (value, self.start_checker))
 
1126
        self.start_checker()    # Start one now, too
 
1127
 
 
1128
    # Checker - property
 
1129
    @dbus_service_property(_interface, signature="s",
 
1130
                           access="readwrite")
 
1131
    def Checker_dbus_property(self, value=None):
 
1132
        if value is None:       # get
 
1133
            return dbus.String(self.checker_command)
 
1134
        self.checker_command = value
 
1135
        # Emit D-Bus signal
 
1136
        self.PropertyChanged(dbus.String("Checker"),
 
1137
                             dbus.String(self.checker_command,
 
1138
                                         variant_level=1))
 
1139
    
 
1140
    # CheckerRunning - property
 
1141
    @dbus_service_property(_interface, signature="b",
 
1142
                           access="readwrite")
 
1143
    def CheckerRunning_dbus_property(self, value=None):
 
1144
        if value is None:       # get
 
1145
            return dbus.Boolean(self.checker is not None)
 
1146
        if value:
 
1147
            self.start_checker()
 
1148
        else:
 
1149
            self.stop_checker()
 
1150
    
 
1151
    # ObjectPath - property
 
1152
    @dbus_service_property(_interface, signature="o", access="read")
 
1153
    def ObjectPath_dbus_property(self):
 
1154
        return self.dbus_object_path # is already a dbus.ObjectPath
 
1155
    
 
1156
    # Secret = property
 
1157
    @dbus_service_property(_interface, signature="ay",
 
1158
                           access="write", byte_arrays=True)
 
1159
    def Secret_dbus_property(self, value):
 
1160
        self.secret = str(value)
 
1161
    
 
1162
    del _interface
 
1163
 
 
1164
 
 
1165
class ProxyClient(object):
 
1166
    def __init__(self, child_pipe, fpr, address):
 
1167
        self._pipe = child_pipe
 
1168
        self._pipe.send(('init', fpr, address))
 
1169
        if not self._pipe.recv():
 
1170
            raise KeyError()
 
1171
 
 
1172
    def __getattribute__(self, name):
 
1173
        if(name == '_pipe'):
 
1174
            return super(ProxyClient, self).__getattribute__(name)
 
1175
        self._pipe.send(('getattr', name))
 
1176
        data = self._pipe.recv()
 
1177
        if data[0] == 'data':
 
1178
            return data[1]
 
1179
        if data[0] == 'function':
 
1180
            def func(*args, **kwargs):
 
1181
                self._pipe.send(('funcall', name, args, kwargs))
 
1182
                return self._pipe.recv()[1]
 
1183
            return func
 
1184
 
 
1185
    def __setattr__(self, name, value):
 
1186
        if(name == '_pipe'):
 
1187
            return super(ProxyClient, self).__setattr__(name, value)
 
1188
        self._pipe.send(('setattr', name, value))
 
1189
 
 
1190
 
 
1191
class ClientHandler(socketserver.BaseRequestHandler, object):
 
1192
    """A class to handle client connections.
 
1193
    
 
1194
    Instantiated once for each connection to handle it.
307
1195
    Note: This will run in its own forked process."""
308
1196
    
309
1197
    def handle(self):
310
 
        logger.debug(u"TCP connection from: %s",
311
 
                     unicode(self.client_address))
312
 
        session = gnutls.connection.ClientSession(self.request,
313
 
                                                  gnutls.connection.\
314
 
                                                  X509Credentials())
315
 
        
316
 
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
317
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
318
 
        #                "+DHE-DSS"))
319
 
        priority = "SECURE256"
320
 
        
321
 
        gnutls.library.functions.gnutls_priority_set_direct\
322
 
            (session._c_object, priority, None);
323
 
        
324
 
        try:
325
 
            session.handshake()
326
 
        except gnutls.errors.GNUTLSError, error:
327
 
            logger.debug(u"Handshake failed: %s", error)
328
 
            # Do not run session.bye() here: the session is not
329
 
            # established.  Just abandon the request.
330
 
            return
331
 
        try:
332
 
            fpr = fingerprint(peer_certificate(session))
333
 
        except (TypeError, gnutls.errors.GNUTLSError), error:
334
 
            logger.debug(u"Bad certificate: %s", error)
335
 
            session.bye()
336
 
            return
337
 
        logger.debug(u"Fingerprint: %s", fpr)
338
 
        client = None
339
 
        for c in clients:
340
 
            if c.fingerprint == fpr:
341
 
                client = c
342
 
                break
343
 
        # Have to check if client.still_valid(), since it is possible
344
 
        # that the client timed out while establishing the GnuTLS
345
 
        # session.
346
 
        if (not client) or (not client.still_valid()):
347
 
            if client:
348
 
                logger.debug(u"Client %(name)s is invalid",
349
 
                             vars(client))
350
 
            else:
351
 
                logger.debug(u"Client not found for fingerprint: %s",
352
 
                             fpr)
353
 
            session.bye()
354
 
            return
355
 
        sent_size = 0
356
 
        while sent_size < len(client.secret):
357
 
            sent = session.send(client.secret[sent_size:])
358
 
            logger.debug(u"Sent: %d, remaining: %d",
359
 
                         sent, len(client.secret)
360
 
                         - (sent_size + sent))
361
 
            sent_size += sent
362
 
        session.bye()
363
 
 
364
 
 
365
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
366
 
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
1198
        with contextlib.closing(self.server.child_pipe) as child_pipe:
 
1199
            logger.info("TCP connection from: %s",
 
1200
                        unicode(self.client_address))
 
1201
            logger.debug("Pipe FD: %d",
 
1202
                         self.server.child_pipe.fileno())
 
1203
 
 
1204
            session = (gnutls.connection
 
1205
                       .ClientSession(self.request,
 
1206
                                      gnutls.connection
 
1207
                                      .X509Credentials()))
 
1208
 
 
1209
            # Note: gnutls.connection.X509Credentials is really a
 
1210
            # generic GnuTLS certificate credentials object so long as
 
1211
            # no X.509 keys are added to it.  Therefore, we can use it
 
1212
            # here despite using OpenPGP certificates.
 
1213
 
 
1214
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
 
1215
            #                      "+AES-256-CBC", "+SHA1",
 
1216
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
 
1217
            #                      "+DHE-DSS"))
 
1218
            # Use a fallback default, since this MUST be set.
 
1219
            priority = self.server.gnutls_priority
 
1220
            if priority is None:
 
1221
                priority = "NORMAL"
 
1222
            (gnutls.library.functions
 
1223
             .gnutls_priority_set_direct(session._c_object,
 
1224
                                         priority, None))
 
1225
 
 
1226
            # Start communication using the Mandos protocol
 
1227
            # Get protocol number
 
1228
            line = self.request.makefile().readline()
 
1229
            logger.debug("Protocol version: %r", line)
 
1230
            try:
 
1231
                if int(line.strip().split()[0]) > 1:
 
1232
                    raise RuntimeError
 
1233
            except (ValueError, IndexError, RuntimeError) as error:
 
1234
                logger.error("Unknown protocol version: %s", error)
 
1235
                return
 
1236
 
 
1237
            # Start GnuTLS connection
 
1238
            try:
 
1239
                session.handshake()
 
1240
            except gnutls.errors.GNUTLSError as error:
 
1241
                logger.warning("Handshake failed: %s", error)
 
1242
                # Do not run session.bye() here: the session is not
 
1243
                # established.  Just abandon the request.
 
1244
                return
 
1245
            logger.debug("Handshake succeeded")
 
1246
 
 
1247
            approval_required = False
 
1248
            try:
 
1249
                try:
 
1250
                    fpr = self.fingerprint(self.peer_certificate
 
1251
                                           (session))
 
1252
                except (TypeError,
 
1253
                        gnutls.errors.GNUTLSError) as error:
 
1254
                    logger.warning("Bad certificate: %s", error)
 
1255
                    return
 
1256
                logger.debug("Fingerprint: %s", fpr)
 
1257
 
 
1258
                try:
 
1259
                    client = ProxyClient(child_pipe, fpr,
 
1260
                                         self.client_address)
 
1261
                except KeyError:
 
1262
                    return
 
1263
                
 
1264
                if client.approval_delay:
 
1265
                    delay = client.approval_delay
 
1266
                    client.approvals_pending += 1
 
1267
                    approval_required = True
 
1268
                
 
1269
                while True:
 
1270
                    if not client.enabled:
 
1271
                        logger.info("Client %s is disabled",
 
1272
                                       client.name)
 
1273
                        if self.server.use_dbus:
 
1274
                            # Emit D-Bus signal
 
1275
                            client.Rejected("Disabled")                    
 
1276
                        return
 
1277
                    
 
1278
                    if client._approved or not client.approval_delay:
 
1279
                        #We are approved or approval is disabled
 
1280
                        break
 
1281
                    elif client._approved is None:
 
1282
                        logger.info("Client %s needs approval",
 
1283
                                    client.name)
 
1284
                        if self.server.use_dbus:
 
1285
                            # Emit D-Bus signal
 
1286
                            client.NeedApproval(
 
1287
                                client.approval_delay_milliseconds(),
 
1288
                                client.approved_by_default)
 
1289
                    else:
 
1290
                        logger.warning("Client %s was not approved",
 
1291
                                       client.name)
 
1292
                        if self.server.use_dbus:
 
1293
                            # Emit D-Bus signal
 
1294
                            client.Rejected("Denied")
 
1295
                        return
 
1296
                    
 
1297
                    #wait until timeout or approved
 
1298
                    #x = float(client._timedelta_to_milliseconds(delay))
 
1299
                    time = datetime.datetime.now()
 
1300
                    client.changedstate.acquire()
 
1301
                    client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
 
1302
                    client.changedstate.release()
 
1303
                    time2 = datetime.datetime.now()
 
1304
                    if (time2 - time) >= delay:
 
1305
                        if not client.approved_by_default:
 
1306
                            logger.warning("Client %s timed out while"
 
1307
                                           " waiting for approval",
 
1308
                                           client.name)
 
1309
                            if self.server.use_dbus:
 
1310
                                # Emit D-Bus signal
 
1311
                                client.Rejected("Approval timed out")
 
1312
                            return
 
1313
                        else:
 
1314
                            break
 
1315
                    else:
 
1316
                        delay -= time2 - time
 
1317
                
 
1318
                sent_size = 0
 
1319
                while sent_size < len(client.secret):
 
1320
                    try:
 
1321
                        sent = session.send(client.secret[sent_size:])
 
1322
                    except gnutls.errors.GNUTLSError as error:
 
1323
                        logger.warning("gnutls send failed")
 
1324
                        return
 
1325
                    logger.debug("Sent: %d, remaining: %d",
 
1326
                                 sent, len(client.secret)
 
1327
                                 - (sent_size + sent))
 
1328
                    sent_size += sent
 
1329
 
 
1330
                logger.info("Sending secret to %s", client.name)
 
1331
                # bump the timeout as if seen
 
1332
                client.checked_ok()
 
1333
                if self.server.use_dbus:
 
1334
                    # Emit D-Bus signal
 
1335
                    client.GotSecret()
 
1336
            
 
1337
            finally:
 
1338
                if approval_required:
 
1339
                    client.approvals_pending -= 1
 
1340
                try:
 
1341
                    session.bye()
 
1342
                except gnutls.errors.GNUTLSError as error:
 
1343
                    logger.warning("GnuTLS bye failed")
 
1344
    
 
1345
    @staticmethod
 
1346
    def peer_certificate(session):
 
1347
        "Return the peer's OpenPGP certificate as a bytestring"
 
1348
        # If not an OpenPGP certificate...
 
1349
        if (gnutls.library.functions
 
1350
            .gnutls_certificate_type_get(session._c_object)
 
1351
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
1352
            # ...do the normal thing
 
1353
            return session.peer_certificate
 
1354
        list_size = ctypes.c_uint(1)
 
1355
        cert_list = (gnutls.library.functions
 
1356
                     .gnutls_certificate_get_peers
 
1357
                     (session._c_object, ctypes.byref(list_size)))
 
1358
        if not bool(cert_list) and list_size.value != 0:
 
1359
            raise gnutls.errors.GNUTLSError("error getting peer"
 
1360
                                            " certificate")
 
1361
        if list_size.value == 0:
 
1362
            return None
 
1363
        cert = cert_list[0]
 
1364
        return ctypes.string_at(cert.data, cert.size)
 
1365
    
 
1366
    @staticmethod
 
1367
    def fingerprint(openpgp):
 
1368
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
 
1369
        # New GnuTLS "datum" with the OpenPGP public key
 
1370
        datum = (gnutls.library.types
 
1371
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
1372
                                             ctypes.POINTER
 
1373
                                             (ctypes.c_ubyte)),
 
1374
                                 ctypes.c_uint(len(openpgp))))
 
1375
        # New empty GnuTLS certificate
 
1376
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
1377
        (gnutls.library.functions
 
1378
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
1379
        # Import the OpenPGP public key into the certificate
 
1380
        (gnutls.library.functions
 
1381
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
1382
                                    gnutls.library.constants
 
1383
                                    .GNUTLS_OPENPGP_FMT_RAW))
 
1384
        # Verify the self signature in the key
 
1385
        crtverify = ctypes.c_uint()
 
1386
        (gnutls.library.functions
 
1387
         .gnutls_openpgp_crt_verify_self(crt, 0,
 
1388
                                         ctypes.byref(crtverify)))
 
1389
        if crtverify.value != 0:
 
1390
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1391
            raise (gnutls.errors.CertificateSecurityError
 
1392
                   ("Verify failed"))
 
1393
        # New buffer for the fingerprint
 
1394
        buf = ctypes.create_string_buffer(20)
 
1395
        buf_len = ctypes.c_size_t()
 
1396
        # Get the fingerprint from the certificate into the buffer
 
1397
        (gnutls.library.functions
 
1398
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
1399
                                             ctypes.byref(buf_len)))
 
1400
        # Deinit the certificate
 
1401
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1402
        # Convert the buffer to a Python bytestring
 
1403
        fpr = ctypes.string_at(buf, buf_len.value)
 
1404
        # Convert the bytestring to hexadecimal notation
 
1405
        hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
 
1406
        return hex_fpr
 
1407
 
 
1408
 
 
1409
class MultiprocessingMixIn(object):
 
1410
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
 
1411
    def sub_process_main(self, request, address):
 
1412
        try:
 
1413
            self.finish_request(request, address)
 
1414
        except:
 
1415
            self.handle_error(request, address)
 
1416
        self.close_request(request)
 
1417
            
 
1418
    def process_request(self, request, address):
 
1419
        """Start a new process to process the request."""
 
1420
        multiprocessing.Process(target = self.sub_process_main,
 
1421
                                args = (request, address)).start()
 
1422
 
 
1423
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
 
1424
    """ adds a pipe to the MixIn """
 
1425
    def process_request(self, request, client_address):
 
1426
        """Overrides and wraps the original process_request().
 
1427
        
 
1428
        This function creates a new pipe in self.pipe
 
1429
        """
 
1430
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
 
1431
 
 
1432
        super(MultiprocessingMixInWithPipe,
 
1433
              self).process_request(request, client_address)
 
1434
        self.child_pipe.close()
 
1435
        self.add_pipe(parent_pipe)
 
1436
 
 
1437
    def add_pipe(self, parent_pipe):
 
1438
        """Dummy function; override as necessary"""
 
1439
        raise NotImplementedError
 
1440
 
 
1441
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
 
1442
                     socketserver.TCPServer, object):
 
1443
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
1444
    
367
1445
    Attributes:
368
 
        options:        Command line options
369
 
        clients:        Set() of Client objects
 
1446
        enabled:        Boolean; whether this server is activated yet
 
1447
        interface:      None or a network interface name (string)
 
1448
        use_ipv6:       Boolean; to use IPv6 or not
370
1449
    """
371
 
    address_family = socket.AF_INET6
372
 
    def __init__(self, *args, **kwargs):
373
 
        if "options" in kwargs:
374
 
            self.options = kwargs["options"]
375
 
            del kwargs["options"]
376
 
        if "clients" in kwargs:
377
 
            self.clients = kwargs["clients"]
378
 
            del kwargs["clients"]
379
 
        return super(type(self), self).__init__(*args, **kwargs)
 
1450
    def __init__(self, server_address, RequestHandlerClass,
 
1451
                 interface=None, use_ipv6=True):
 
1452
        self.interface = interface
 
1453
        if use_ipv6:
 
1454
            self.address_family = socket.AF_INET6
 
1455
        socketserver.TCPServer.__init__(self, server_address,
 
1456
                                        RequestHandlerClass)
380
1457
    def server_bind(self):
381
1458
        """This overrides the normal server_bind() function
382
1459
        to bind to an interface if one was specified, and also NOT to
383
1460
        bind to an address or port if they were not specified."""
384
 
        if self.options.interface:
385
 
            if not hasattr(socket, "SO_BINDTODEVICE"):
386
 
                # From /usr/include/asm-i486/socket.h
387
 
                socket.SO_BINDTODEVICE = 25
388
 
            try:
389
 
                self.socket.setsockopt(socket.SOL_SOCKET,
390
 
                                       socket.SO_BINDTODEVICE,
391
 
                                       self.options.interface)
392
 
            except socket.error, error:
393
 
                if error[0] == errno.EPERM:
394
 
                    logger.warning(u"No permission to"
395
 
                                   u" bind to interface %s",
396
 
                                   self.options.interface)
397
 
                else:
398
 
                    raise error
 
1461
        if self.interface is not None:
 
1462
            if SO_BINDTODEVICE is None:
 
1463
                logger.error("SO_BINDTODEVICE does not exist;"
 
1464
                             " cannot bind to interface %s",
 
1465
                             self.interface)
 
1466
            else:
 
1467
                try:
 
1468
                    self.socket.setsockopt(socket.SOL_SOCKET,
 
1469
                                           SO_BINDTODEVICE,
 
1470
                                           str(self.interface
 
1471
                                               + '\0'))
 
1472
                except socket.error as error:
 
1473
                    if error[0] == errno.EPERM:
 
1474
                        logger.error("No permission to"
 
1475
                                     " bind to interface %s",
 
1476
                                     self.interface)
 
1477
                    elif error[0] == errno.ENOPROTOOPT:
 
1478
                        logger.error("SO_BINDTODEVICE not available;"
 
1479
                                     " cannot bind to interface %s",
 
1480
                                     self.interface)
 
1481
                    else:
 
1482
                        raise
399
1483
        # Only bind(2) the socket if we really need to.
400
1484
        if self.server_address[0] or self.server_address[1]:
401
1485
            if not self.server_address[0]:
402
 
                in6addr_any = "::"
403
 
                self.server_address = (in6addr_any,
 
1486
                if self.address_family == socket.AF_INET6:
 
1487
                    any_address = "::" # in6addr_any
 
1488
                else:
 
1489
                    any_address = socket.INADDR_ANY
 
1490
                self.server_address = (any_address,
404
1491
                                       self.server_address[1])
405
 
            elif self.server_address[1] is None:
 
1492
            elif not self.server_address[1]:
406
1493
                self.server_address = (self.server_address[0],
407
1494
                                       0)
408
 
            return super(type(self), self).server_bind()
 
1495
#                 if self.interface:
 
1496
#                     self.server_address = (self.server_address[0],
 
1497
#                                            0, # port
 
1498
#                                            0, # flowinfo
 
1499
#                                            if_nametoindex
 
1500
#                                            (self.interface))
 
1501
            return socketserver.TCPServer.server_bind(self)
 
1502
 
 
1503
 
 
1504
class MandosServer(IPv6_TCPServer):
 
1505
    """Mandos server.
 
1506
    
 
1507
    Attributes:
 
1508
        clients:        set of Client objects
 
1509
        gnutls_priority GnuTLS priority string
 
1510
        use_dbus:       Boolean; to emit D-Bus signals or not
 
1511
    
 
1512
    Assumes a gobject.MainLoop event loop.
 
1513
    """
 
1514
    def __init__(self, server_address, RequestHandlerClass,
 
1515
                 interface=None, use_ipv6=True, clients=None,
 
1516
                 gnutls_priority=None, use_dbus=True):
 
1517
        self.enabled = False
 
1518
        self.clients = clients
 
1519
        if self.clients is None:
 
1520
            self.clients = set()
 
1521
        self.use_dbus = use_dbus
 
1522
        self.gnutls_priority = gnutls_priority
 
1523
        IPv6_TCPServer.__init__(self, server_address,
 
1524
                                RequestHandlerClass,
 
1525
                                interface = interface,
 
1526
                                use_ipv6 = use_ipv6)
 
1527
    def server_activate(self):
 
1528
        if self.enabled:
 
1529
            return socketserver.TCPServer.server_activate(self)
 
1530
    def enable(self):
 
1531
        self.enabled = True
 
1532
    def add_pipe(self, parent_pipe):
 
1533
        # Call "handle_ipc" for both data and EOF events
 
1534
        gobject.io_add_watch(parent_pipe.fileno(),
 
1535
                             gobject.IO_IN | gobject.IO_HUP,
 
1536
                             functools.partial(self.handle_ipc,
 
1537
                                               parent_pipe = parent_pipe))
 
1538
        
 
1539
    def handle_ipc(self, source, condition, parent_pipe=None,
 
1540
                   client_object=None):
 
1541
        condition_names = {
 
1542
            gobject.IO_IN: "IN",   # There is data to read.
 
1543
            gobject.IO_OUT: "OUT", # Data can be written (without
 
1544
                                    # blocking).
 
1545
            gobject.IO_PRI: "PRI", # There is urgent data to read.
 
1546
            gobject.IO_ERR: "ERR", # Error condition.
 
1547
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
 
1548
                                    # broken, usually for pipes and
 
1549
                                    # sockets).
 
1550
            }
 
1551
        conditions_string = ' | '.join(name
 
1552
                                       for cond, name in
 
1553
                                       condition_names.iteritems()
 
1554
                                       if cond & condition)
 
1555
        # error or the other end of multiprocessing.Pipe has closed
 
1556
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
 
1557
            return False
 
1558
        
 
1559
        # Read a request from the child
 
1560
        request = parent_pipe.recv()
 
1561
        command = request[0]
 
1562
        
 
1563
        if command == 'init':
 
1564
            fpr = request[1]
 
1565
            address = request[2]
 
1566
            
 
1567
            for c in self.clients:
 
1568
                if c.fingerprint == fpr:
 
1569
                    client = c
 
1570
                    break
 
1571
            else:
 
1572
                logger.info("Client not found for fingerprint: %s, ad"
 
1573
                            "dress: %s", fpr, address)
 
1574
                if self.use_dbus:
 
1575
                    # Emit D-Bus signal
 
1576
                    mandos_dbus_service.ClientNotFound(fpr, address[0])
 
1577
                parent_pipe.send(False)
 
1578
                return False
 
1579
            
 
1580
            gobject.io_add_watch(parent_pipe.fileno(),
 
1581
                                 gobject.IO_IN | gobject.IO_HUP,
 
1582
                                 functools.partial(self.handle_ipc,
 
1583
                                                   parent_pipe = parent_pipe,
 
1584
                                                   client_object = client))
 
1585
            parent_pipe.send(True)
 
1586
            # remove the old hook in favor of the new above hook on same fileno
 
1587
            return False
 
1588
        if command == 'funcall':
 
1589
            funcname = request[1]
 
1590
            args = request[2]
 
1591
            kwargs = request[3]
 
1592
            
 
1593
            parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
 
1594
 
 
1595
        if command == 'getattr':
 
1596
            attrname = request[1]
 
1597
            if callable(client_object.__getattribute__(attrname)):
 
1598
                parent_pipe.send(('function',))
 
1599
            else:
 
1600
                parent_pipe.send(('data', client_object.__getattribute__(attrname)))
 
1601
        
 
1602
        if command == 'setattr':
 
1603
            attrname = request[1]
 
1604
            value = request[2]
 
1605
            setattr(client_object, attrname, value)
 
1606
 
 
1607
        return True
409
1608
 
410
1609
 
411
1610
def string_to_delta(interval):
412
1611
    """Parse a string and return a datetime.timedelta
413
 
 
 
1612
    
414
1613
    >>> string_to_delta('7d')
415
1614
    datetime.timedelta(7)
416
1615
    >>> string_to_delta('60s')
419
1618
    datetime.timedelta(0, 3600)
420
1619
    >>> string_to_delta('24h')
421
1620
    datetime.timedelta(1)
422
 
    >>> string_to_delta(u'1w')
 
1621
    >>> string_to_delta('1w')
423
1622
    datetime.timedelta(7)
 
1623
    >>> string_to_delta('5m 30s')
 
1624
    datetime.timedelta(0, 330)
424
1625
    """
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:
439
 
            raise ValueError
440
 
    except (ValueError, IndexError):
441
 
        raise ValueError
442
 
    return delta
443
 
 
444
 
 
445
 
def add_service():
446
 
    """From the Avahi server example code"""
447
 
    global group, serviceName, serviceType, servicePort, serviceTXT, \
448
 
           domain, host
449
 
    if group is None:
450
 
        group = dbus.Interface(
451
 
                bus.get_object( avahi.DBUS_NAME,
452
 
                                server.EntryGroupNew()),
453
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
454
 
        group.connect_to_signal('StateChanged',
455
 
                                entry_group_state_changed)
456
 
    logger.debug(u"Adding service '%s' of type '%s' ...",
457
 
                 serviceName, serviceType)
458
 
    
459
 
    group.AddService(
460
 
            serviceInterface,           # interface
461
 
            avahi.PROTO_INET6,          # protocol
462
 
            dbus.UInt32(0),             # flags
463
 
            serviceName, serviceType,
464
 
            domain, host,
465
 
            dbus.UInt16(servicePort),
466
 
            avahi.string_array_to_txt_array(serviceTXT))
467
 
    group.Commit()
468
 
 
469
 
 
470
 
def remove_service():
471
 
    """From the Avahi server example code"""
472
 
    global group
473
 
    
474
 
    if not group is None:
475
 
        group.Reset()
476
 
 
477
 
 
478
 
def server_state_changed(state):
479
 
    """From the Avahi server example code"""
480
 
    if state == avahi.SERVER_COLLISION:
481
 
        logger.warning(u"Server name collision")
482
 
        remove_service()
483
 
    elif state == avahi.SERVER_RUNNING:
484
 
        add_service()
485
 
 
486
 
 
487
 
def entry_group_state_changed(state, error):
488
 
    """From the Avahi server example code"""
489
 
    global serviceName, server, rename_count
490
 
    
491
 
    logger.debug(u"state change: %i", state)
492
 
    
493
 
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
494
 
        logger.debug(u"Service established.")
495
 
    elif state == avahi.ENTRY_GROUP_COLLISION:
496
 
        
497
 
        rename_count = rename_count - 1
498
 
        if rename_count > 0:
499
 
            name = server.GetAlternativeServiceName(name)
500
 
            logger.warning(u"Service name collision, "
501
 
                           u"changing name to '%s' ...", name)
502
 
            remove_service()
503
 
            add_service()
504
 
            
505
 
        else:
506
 
            logger.error(u"No suitable service name found "
507
 
                         u"after %i retries, exiting.",
508
 
                         n_rename)
509
 
            main_loop.quit()
510
 
    elif state == avahi.ENTRY_GROUP_FAILURE:
511
 
        logger.error(u"Error in group state changed %s",
512
 
                     unicode(error))
513
 
        main_loop.quit()
514
 
        return
 
1626
    timevalue = datetime.timedelta(0)
 
1627
    for s in interval.split():
 
1628
        try:
 
1629
            suffix = unicode(s[-1])
 
1630
            value = int(s[:-1])
 
1631
            if suffix == "d":
 
1632
                delta = datetime.timedelta(value)
 
1633
            elif suffix == "s":
 
1634
                delta = datetime.timedelta(0, value)
 
1635
            elif suffix == "m":
 
1636
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
1637
            elif suffix == "h":
 
1638
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
1639
            elif suffix == "w":
 
1640
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
1641
            else:
 
1642
                raise ValueError("Unknown suffix %r" % suffix)
 
1643
        except (ValueError, IndexError) as e:
 
1644
            raise ValueError(*(e.args))
 
1645
        timevalue += delta
 
1646
    return timevalue
515
1647
 
516
1648
 
517
1649
def if_nametoindex(interface):
518
 
    """Call the C function if_nametoindex()"""
 
1650
    """Call the C function if_nametoindex(), or equivalent
 
1651
    
 
1652
    Note: This function cannot accept a unicode string."""
 
1653
    global if_nametoindex
519
1654
    try:
520
 
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
521
 
        return libc.if_nametoindex(interface)
 
1655
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
1656
                          (ctypes.util.find_library("c"))
 
1657
                          .if_nametoindex)
522
1658
    except (OSError, AttributeError):
523
 
        if "struct" not in sys.modules:
524
 
            import struct
525
 
        if "fcntl" not in sys.modules:
526
 
            import fcntl
527
 
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
528
 
        s = socket.socket()
529
 
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
530
 
                            struct.pack("16s16x", interface))
531
 
        s.close()
532
 
        interface_index = struct.unpack("I", ifreq[16:20])[0]
533
 
        return interface_index
534
 
 
535
 
 
536
 
if __name__ == '__main__':
537
 
    parser = OptionParser()
538
 
    parser.add_option("-i", "--interface", type="string",
539
 
                      default=None, metavar="IF",
540
 
                      help="Bind to interface IF")
541
 
    parser.add_option("--cert", type="string", default="cert.pem",
542
 
                      metavar="FILE",
543
 
                      help="Public key certificate PEM file to use")
544
 
    parser.add_option("--key", type="string", default="key.pem",
545
 
                      metavar="FILE",
546
 
                      help="Private key PEM file to use")
547
 
    parser.add_option("--ca", type="string", default="ca.pem",
548
 
                      metavar="FILE",
549
 
                      help="Certificate Authority certificate PEM file to use")
550
 
    parser.add_option("--crl", type="string", default="crl.pem",
551
 
                      metavar="FILE",
552
 
                      help="Certificate Revokation List PEM file to use")
553
 
    parser.add_option("-p", "--port", type="int", default=None,
554
 
                      help="Port number to receive requests on")
555
 
    parser.add_option("--timeout", type="string", # Parsed later
556
 
                      default="1h",
557
 
                      help="Amount of downtime allowed for clients")
558
 
    parser.add_option("--interval", type="string", # Parsed later
559
 
                      default="5m",
560
 
                      help="How often to check that a client is up")
561
 
    parser.add_option("--check", action="store_true", default=False,
562
 
                      help="Run self-test")
563
 
    parser.add_option("--debug", action="store_true", default=False,
564
 
                      help="Debug mode")
565
 
    (options, args) = parser.parse_args()
 
1659
        logger.warning("Doing if_nametoindex the hard way")
 
1660
        def if_nametoindex(interface):
 
1661
            "Get an interface index the hard way, i.e. using fcntl()"
 
1662
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
1663
            with contextlib.closing(socket.socket()) as s:
 
1664
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
1665
                                    struct.pack(str("16s16x"),
 
1666
                                                interface))
 
1667
            interface_index = struct.unpack(str("I"),
 
1668
                                            ifreq[16:20])[0]
 
1669
            return interface_index
 
1670
    return if_nametoindex(interface)
 
1671
 
 
1672
 
 
1673
def daemon(nochdir = False, noclose = False):
 
1674
    """See daemon(3).  Standard BSD Unix function.
 
1675
    
 
1676
    This should really exist as os.daemon, but it doesn't (yet)."""
 
1677
    if os.fork():
 
1678
        sys.exit()
 
1679
    os.setsid()
 
1680
    if not nochdir:
 
1681
        os.chdir("/")
 
1682
    if os.fork():
 
1683
        sys.exit()
 
1684
    if not noclose:
 
1685
        # Close all standard open file descriptors
 
1686
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1687
        if not stat.S_ISCHR(os.fstat(null).st_mode):
 
1688
            raise OSError(errno.ENODEV,
 
1689
                          "%s not a character device"
 
1690
                          % os.path.devnull)
 
1691
        os.dup2(null, sys.stdin.fileno())
 
1692
        os.dup2(null, sys.stdout.fileno())
 
1693
        os.dup2(null, sys.stderr.fileno())
 
1694
        if null > 2:
 
1695
            os.close(null)
 
1696
 
 
1697
 
 
1698
def main():
 
1699
    
 
1700
    ##################################################################
 
1701
    # Parsing of options, both command line and config file
 
1702
    
 
1703
    parser = argparse.ArgumentParser()
 
1704
    parser.add_argument("-v", "--version", action="version",
 
1705
                        version = "%%(prog)s %s" % version,
 
1706
                        help="show version number and exit")
 
1707
    parser.add_argument("-i", "--interface", metavar="IF",
 
1708
                        help="Bind to interface IF")
 
1709
    parser.add_argument("-a", "--address",
 
1710
                        help="Address to listen for requests on")
 
1711
    parser.add_argument("-p", "--port", type=int,
 
1712
                        help="Port number to receive requests on")
 
1713
    parser.add_argument("--check", action="store_true",
 
1714
                        help="Run self-test")
 
1715
    parser.add_argument("--debug", action="store_true",
 
1716
                        help="Debug mode; run in foreground and log"
 
1717
                        " to terminal")
 
1718
    parser.add_argument("--debuglevel", metavar="LEVEL",
 
1719
                        help="Debug level for stdout output")
 
1720
    parser.add_argument("--priority", help="GnuTLS"
 
1721
                        " priority string (see GnuTLS documentation)")
 
1722
    parser.add_argument("--servicename",
 
1723
                        metavar="NAME", help="Zeroconf service name")
 
1724
    parser.add_argument("--configdir",
 
1725
                        default="/etc/mandos", metavar="DIR",
 
1726
                        help="Directory to search for configuration"
 
1727
                        " files")
 
1728
    parser.add_argument("--no-dbus", action="store_false",
 
1729
                        dest="use_dbus", help="Do not provide D-Bus"
 
1730
                        " system bus interface")
 
1731
    parser.add_argument("--no-ipv6", action="store_false",
 
1732
                        dest="use_ipv6", help="Do not use IPv6")
 
1733
    options = parser.parse_args()
566
1734
    
567
1735
    if options.check:
568
1736
        import doctest
569
1737
        doctest.testmod()
570
1738
        sys.exit()
571
1739
    
572
 
    # Parse the time arguments
573
 
    try:
574
 
        options.timeout = string_to_delta(options.timeout)
575
 
    except ValueError:
576
 
        parser.error("option --timeout: Unparseable time")
577
 
    try:
578
 
        options.interval = string_to_delta(options.interval)
579
 
    except ValueError:
580
 
        parser.error("option --interval: Unparseable time")
581
 
    
582
 
    # Parse config file
583
 
    defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
584
 
    client_config = ConfigParser.SafeConfigParser(defaults)
585
 
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
586
 
    client_config.read("mandos-clients.conf")
587
 
    
588
 
    # From the Avahi server example code
 
1740
    # Default values for config file for server-global settings
 
1741
    server_defaults = { "interface": "",
 
1742
                        "address": "",
 
1743
                        "port": "",
 
1744
                        "debug": "False",
 
1745
                        "priority":
 
1746
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
1747
                        "servicename": "Mandos",
 
1748
                        "use_dbus": "True",
 
1749
                        "use_ipv6": "True",
 
1750
                        "debuglevel": "",
 
1751
                        }
 
1752
    
 
1753
    # Parse config file for server-global settings
 
1754
    server_config = configparser.SafeConfigParser(server_defaults)
 
1755
    del server_defaults
 
1756
    server_config.read(os.path.join(options.configdir,
 
1757
                                    "mandos.conf"))
 
1758
    # Convert the SafeConfigParser object to a dict
 
1759
    server_settings = server_config.defaults()
 
1760
    # Use the appropriate methods on the non-string config options
 
1761
    for option in ("debug", "use_dbus", "use_ipv6"):
 
1762
        server_settings[option] = server_config.getboolean("DEFAULT",
 
1763
                                                           option)
 
1764
    if server_settings["port"]:
 
1765
        server_settings["port"] = server_config.getint("DEFAULT",
 
1766
                                                       "port")
 
1767
    del server_config
 
1768
    
 
1769
    # Override the settings from the config file with command line
 
1770
    # options, if set.
 
1771
    for option in ("interface", "address", "port", "debug",
 
1772
                   "priority", "servicename", "configdir",
 
1773
                   "use_dbus", "use_ipv6", "debuglevel"):
 
1774
        value = getattr(options, option)
 
1775
        if value is not None:
 
1776
            server_settings[option] = value
 
1777
    del options
 
1778
    # Force all strings to be unicode
 
1779
    for option in server_settings.keys():
 
1780
        if type(server_settings[option]) is str:
 
1781
            server_settings[option] = unicode(server_settings[option])
 
1782
    # Now we have our good server settings in "server_settings"
 
1783
    
 
1784
    ##################################################################
 
1785
    
 
1786
    # For convenience
 
1787
    debug = server_settings["debug"]
 
1788
    debuglevel = server_settings["debuglevel"]
 
1789
    use_dbus = server_settings["use_dbus"]
 
1790
    use_ipv6 = server_settings["use_ipv6"]
 
1791
 
 
1792
    if server_settings["servicename"] != "Mandos":
 
1793
        syslogger.setFormatter(logging.Formatter
 
1794
                               ('Mandos (%s) [%%(process)d]:'
 
1795
                                ' %%(levelname)s: %%(message)s'
 
1796
                                % server_settings["servicename"]))
 
1797
    
 
1798
    # Parse config file with clients
 
1799
    client_defaults = { "timeout": "1h",
 
1800
                        "interval": "5m",
 
1801
                        "checker": "fping -q -- %%(host)s",
 
1802
                        "host": "",
 
1803
                        "approval_delay": "0s",
 
1804
                        "approval_duration": "1s",
 
1805
                        }
 
1806
    client_config = configparser.SafeConfigParser(client_defaults)
 
1807
    client_config.read(os.path.join(server_settings["configdir"],
 
1808
                                    "clients.conf"))
 
1809
    
 
1810
    global mandos_dbus_service
 
1811
    mandos_dbus_service = None
 
1812
    
 
1813
    tcp_server = MandosServer((server_settings["address"],
 
1814
                               server_settings["port"]),
 
1815
                              ClientHandler,
 
1816
                              interface=(server_settings["interface"]
 
1817
                                         or None),
 
1818
                              use_ipv6=use_ipv6,
 
1819
                              gnutls_priority=
 
1820
                              server_settings["priority"],
 
1821
                              use_dbus=use_dbus)
 
1822
    if not debug:
 
1823
        pidfilename = "/var/run/mandos.pid"
 
1824
        try:
 
1825
            pidfile = open(pidfilename, "w")
 
1826
        except IOError:
 
1827
            logger.error("Could not open file %r", pidfilename)
 
1828
    
 
1829
    try:
 
1830
        uid = pwd.getpwnam("_mandos").pw_uid
 
1831
        gid = pwd.getpwnam("_mandos").pw_gid
 
1832
    except KeyError:
 
1833
        try:
 
1834
            uid = pwd.getpwnam("mandos").pw_uid
 
1835
            gid = pwd.getpwnam("mandos").pw_gid
 
1836
        except KeyError:
 
1837
            try:
 
1838
                uid = pwd.getpwnam("nobody").pw_uid
 
1839
                gid = pwd.getpwnam("nobody").pw_gid
 
1840
            except KeyError:
 
1841
                uid = 65534
 
1842
                gid = 65534
 
1843
    try:
 
1844
        os.setgid(gid)
 
1845
        os.setuid(uid)
 
1846
    except OSError as error:
 
1847
        if error[0] != errno.EPERM:
 
1848
            raise error
 
1849
    
 
1850
    if not debug and not debuglevel:
 
1851
        syslogger.setLevel(logging.WARNING)
 
1852
        console.setLevel(logging.WARNING)
 
1853
    if debuglevel:
 
1854
        level = getattr(logging, debuglevel.upper())
 
1855
        syslogger.setLevel(level)
 
1856
        console.setLevel(level)
 
1857
 
 
1858
    if debug:
 
1859
        # Enable all possible GnuTLS debugging
 
1860
        
 
1861
        # "Use a log level over 10 to enable all debugging options."
 
1862
        # - GnuTLS manual
 
1863
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1864
        
 
1865
        @gnutls.library.types.gnutls_log_func
 
1866
        def debug_gnutls(level, string):
 
1867
            logger.debug("GnuTLS: %s", string[:-1])
 
1868
        
 
1869
        (gnutls.library.functions
 
1870
         .gnutls_global_set_log_function(debug_gnutls))
 
1871
        
 
1872
        # Redirect stdin so all checkers get /dev/null
 
1873
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1874
        os.dup2(null, sys.stdin.fileno())
 
1875
        if null > 2:
 
1876
            os.close(null)
 
1877
    else:
 
1878
        # No console logging
 
1879
        logger.removeHandler(console)
 
1880
    
 
1881
    # Need to fork before connecting to D-Bus
 
1882
    if not debug:
 
1883
        # Close all input and output, do double fork, etc.
 
1884
        daemon()
 
1885
    
 
1886
    global main_loop
 
1887
    # From the Avahi example code
589
1888
    DBusGMainLoop(set_as_default=True )
590
1889
    main_loop = gobject.MainLoop()
591
1890
    bus = dbus.SystemBus()
592
 
    server = dbus.Interface(
593
 
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
594
 
            avahi.DBUS_INTERFACE_SERVER )
595
 
    # End of Avahi example code
596
 
    
597
 
    debug = options.debug
598
 
    
599
 
    clients = Set()
600
 
    def remove_from_clients(client):
601
 
        clients.remove(client)
602
 
        if not clients:
603
 
            logger.debug(u"No clients left, exiting")
604
 
            main_loop.quit()
605
 
    
606
 
    clients.update(Set(Client(name=section, options=options,
607
 
                              stop_hook = remove_from_clients,
608
 
                              **(dict(client_config\
609
 
                                      .items(section))))
610
 
                       for section in client_config.sections()))
611
 
    for client in clients:
612
 
        client.start()
613
 
    
614
 
    tcp_server = IPv6_TCPServer((None, options.port),
615
 
                                tcp_handler,
616
 
                                options=options,
617
 
                                clients=clients)
618
 
    # Find out what random port we got
619
 
    servicePort = tcp_server.socket.getsockname()[1]
620
 
    logger.debug(u"Now listening on port %d", servicePort)
621
 
    
622
 
    if options.interface is not None:
623
 
        serviceInterface = if_nametoindex(options.interface)
624
 
    
625
 
    # From the Avahi server example code
626
 
    server.connect_to_signal("StateChanged", server_state_changed)
627
 
    server_state_changed(server.GetState())
628
 
    # End of Avahi example code
629
 
    
630
 
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
631
 
                         lambda *args, **kwargs:
632
 
                         tcp_server.handle_request(*args[2:],
633
 
                                                   **kwargs) or True)
 
1891
    # End of Avahi example code
 
1892
    if use_dbus:
 
1893
        try:
 
1894
            bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",
 
1895
                                            bus, do_not_queue=True)
 
1896
        except dbus.exceptions.NameExistsException as e:
 
1897
            logger.error(unicode(e) + ", disabling D-Bus")
 
1898
            use_dbus = False
 
1899
            server_settings["use_dbus"] = False
 
1900
            tcp_server.use_dbus = False
 
1901
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
1902
    service = AvahiService(name = server_settings["servicename"],
 
1903
                           servicetype = "_mandos._tcp",
 
1904
                           protocol = protocol, bus = bus)
 
1905
    if server_settings["interface"]:
 
1906
        service.interface = (if_nametoindex
 
1907
                             (str(server_settings["interface"])))
 
1908
    
 
1909
    global multiprocessing_manager
 
1910
    multiprocessing_manager = multiprocessing.Manager()
 
1911
    
 
1912
    client_class = Client
 
1913
    if use_dbus:
 
1914
        client_class = functools.partial(ClientDBus, bus = bus)
 
1915
    def client_config_items(config, section):
 
1916
        special_settings = {
 
1917
            "approved_by_default":
 
1918
                lambda: config.getboolean(section,
 
1919
                                          "approved_by_default"),
 
1920
            }
 
1921
        for name, value in config.items(section):
 
1922
            try:
 
1923
                yield (name, special_settings[name]())
 
1924
            except KeyError:
 
1925
                yield (name, value)
 
1926
    
 
1927
    tcp_server.clients.update(set(
 
1928
            client_class(name = section,
 
1929
                         config= dict(client_config_items(
 
1930
                        client_config, section)))
 
1931
            for section in client_config.sections()))
 
1932
    if not tcp_server.clients:
 
1933
        logger.warning("No clients defined")
 
1934
        
 
1935
    if not debug:
 
1936
        try:
 
1937
            with pidfile:
 
1938
                pid = os.getpid()
 
1939
                pidfile.write(str(pid) + "\n".encode("utf-8"))
 
1940
            del pidfile
 
1941
        except IOError:
 
1942
            logger.error("Could not write to file %r with PID %d",
 
1943
                         pidfilename, pid)
 
1944
        except NameError:
 
1945
            # "pidfile" was never created
 
1946
            pass
 
1947
        del pidfilename
 
1948
        
 
1949
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
1950
 
 
1951
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
1952
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
1953
    
 
1954
    if use_dbus:
 
1955
        class MandosDBusService(dbus.service.Object):
 
1956
            """A D-Bus proxy object"""
 
1957
            def __init__(self):
 
1958
                dbus.service.Object.__init__(self, bus, "/")
 
1959
            _interface = "se.bsnet.fukt.Mandos"
 
1960
            
 
1961
            @dbus.service.signal(_interface, signature="o")
 
1962
            def ClientAdded(self, objpath):
 
1963
                "D-Bus signal"
 
1964
                pass
 
1965
            
 
1966
            @dbus.service.signal(_interface, signature="ss")
 
1967
            def ClientNotFound(self, fingerprint, address):
 
1968
                "D-Bus signal"
 
1969
                pass
 
1970
            
 
1971
            @dbus.service.signal(_interface, signature="os")
 
1972
            def ClientRemoved(self, objpath, name):
 
1973
                "D-Bus signal"
 
1974
                pass
 
1975
            
 
1976
            @dbus.service.method(_interface, out_signature="ao")
 
1977
            def GetAllClients(self):
 
1978
                "D-Bus method"
 
1979
                return dbus.Array(c.dbus_object_path
 
1980
                                  for c in tcp_server.clients)
 
1981
            
 
1982
            @dbus.service.method(_interface,
 
1983
                                 out_signature="a{oa{sv}}")
 
1984
            def GetAllClientsWithProperties(self):
 
1985
                "D-Bus method"
 
1986
                return dbus.Dictionary(
 
1987
                    ((c.dbus_object_path, c.GetAll(""))
 
1988
                     for c in tcp_server.clients),
 
1989
                    signature="oa{sv}")
 
1990
            
 
1991
            @dbus.service.method(_interface, in_signature="o")
 
1992
            def RemoveClient(self, object_path):
 
1993
                "D-Bus method"
 
1994
                for c in tcp_server.clients:
 
1995
                    if c.dbus_object_path == object_path:
 
1996
                        tcp_server.clients.remove(c)
 
1997
                        c.remove_from_connection()
 
1998
                        # Don't signal anything except ClientRemoved
 
1999
                        c.disable(quiet=True)
 
2000
                        # Emit D-Bus signal
 
2001
                        self.ClientRemoved(object_path, c.name)
 
2002
                        return
 
2003
                raise KeyError(object_path)
 
2004
            
 
2005
            del _interface
 
2006
        
 
2007
        mandos_dbus_service = MandosDBusService()
 
2008
    
 
2009
    def cleanup():
 
2010
        "Cleanup function; run on exit"
 
2011
        service.cleanup()
 
2012
        
 
2013
        while tcp_server.clients:
 
2014
            client = tcp_server.clients.pop()
 
2015
            if use_dbus:
 
2016
                client.remove_from_connection()
 
2017
            client.disable_hook = None
 
2018
            # Don't signal anything except ClientRemoved
 
2019
            client.disable(quiet=True)
 
2020
            if use_dbus:
 
2021
                # Emit D-Bus signal
 
2022
                mandos_dbus_service.ClientRemoved(client.dbus_object_path,
 
2023
                                                  client.name)
 
2024
    
 
2025
    atexit.register(cleanup)
 
2026
    
 
2027
    for client in tcp_server.clients:
 
2028
        if use_dbus:
 
2029
            # Emit D-Bus signal
 
2030
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
 
2031
        client.enable()
 
2032
    
 
2033
    tcp_server.enable()
 
2034
    tcp_server.server_activate()
 
2035
    
 
2036
    # Find out what port we got
 
2037
    service.port = tcp_server.socket.getsockname()[1]
 
2038
    if use_ipv6:
 
2039
        logger.info("Now listening on address %r, port %d,"
 
2040
                    " flowinfo %d, scope_id %d"
 
2041
                    % tcp_server.socket.getsockname())
 
2042
    else:                       # IPv4
 
2043
        logger.info("Now listening on address %r, port %d"
 
2044
                    % tcp_server.socket.getsockname())
 
2045
    
 
2046
    #service.interface = tcp_server.socket.getsockname()[3]
 
2047
    
634
2048
    try:
 
2049
        # From the Avahi example code
 
2050
        try:
 
2051
            service.activate()
 
2052
        except dbus.exceptions.DBusException as error:
 
2053
            logger.critical("DBusException: %s", error)
 
2054
            cleanup()
 
2055
            sys.exit(1)
 
2056
        # End of Avahi example code
 
2057
        
 
2058
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
2059
                             lambda *args, **kwargs:
 
2060
                             (tcp_server.handle_request
 
2061
                              (*args[2:], **kwargs) or True))
 
2062
        
 
2063
        logger.debug("Starting main loop")
635
2064
        main_loop.run()
 
2065
    except AvahiError as error:
 
2066
        logger.critical("AvahiError: %s", error)
 
2067
        cleanup()
 
2068
        sys.exit(1)
636
2069
    except KeyboardInterrupt:
637
 
        print
638
 
    
639
 
    # Cleanup here
 
2070
        if debug:
 
2071
            print("", file=sys.stderr)
 
2072
        logger.debug("Server received KeyboardInterrupt")
 
2073
    logger.debug("Server exiting")
 
2074
    # Must run before the D-Bus bus name gets deregistered
 
2075
    cleanup()
640
2076
 
641
 
    # From the Avahi server example code
642
 
    if not group is None:
643
 
        group.Free()
644
 
    # End of Avahi example code
645
 
    
646
 
    for client in clients:
647
 
        client.stop_hook = None
648
 
        client.stop()
 
2077
if __name__ == '__main__':
 
2078
    main()