/mandos/release

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  • Committer: Teddy Hogeborn
  • Date: 2008-08-03 03:33:56 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080803033356-6aemgj0g0hoz91ow
* plugins.d/mandosclient.c (pgp_packet_decrypt): Renamed variables.
                                                 On debug, show
                                                 decrypted plaintext
                                                 in hexadecimal.  Free
                                                 the GPGME data
                                                 buffers even on
                                                 errors.

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Lines of Context:
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# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add", "remove", "server_state_changed",
10
 
# "entry_group_state_changed", "cleanup", and "activate" in the
11
 
# "AvahiService" class, and some lines in "main".
 
9
# following functions: "AvahiService.add", "AvahiService.remove",
 
10
# "server_state_changed", "entry_group_state_changed", and some lines
 
11
# in "main".
12
12
13
13
# Everything else is
14
 
# Copyright © 2008-2011 Teddy Hogeborn
15
 
# Copyright © 2008-2011 Björn Påhlsson
 
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
16
15
17
16
# This program is free software: you can redistribute it and/or modify
18
17
# it under the terms of the GNU General Public License as published by
25
24
#     GNU General Public License for more details.
26
25
27
26
# You should have received a copy of the GNU General Public License
28
 
# along with this program.  If not, see
29
 
# <http://www.gnu.org/licenses/>.
 
27
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
30
28
31
29
# Contact the authors at <mandos@fukt.bsnet.se>.
32
30
33
31
 
34
 
from __future__ import (division, absolute_import, print_function,
35
 
                        unicode_literals)
 
32
from __future__ import division
36
33
 
37
 
import SocketServer as socketserver
 
34
import SocketServer
38
35
import socket
39
 
import argparse
 
36
import select
 
37
from optparse import OptionParser
40
38
import datetime
41
39
import errno
42
40
import gnutls.crypto
45
43
import gnutls.library.functions
46
44
import gnutls.library.constants
47
45
import gnutls.library.types
48
 
import ConfigParser as configparser
 
46
import ConfigParser
49
47
import sys
50
48
import re
51
49
import os
52
50
import signal
 
51
from sets import Set
53
52
import subprocess
54
53
import atexit
55
54
import stat
56
55
import logging
57
56
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
65
 
import types
66
57
 
67
58
import dbus
68
 
import dbus.service
69
59
import gobject
70
60
import avahi
71
61
from dbus.mainloop.glib import DBusGMainLoop
72
62
import ctypes
73
 
import ctypes.util
74
 
import xml.dom.minidom
75
 
import inspect
76
 
 
77
 
try:
78
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
79
 
except AttributeError:
80
 
    try:
81
 
        from IN import SO_BINDTODEVICE
82
 
    except ImportError:
83
 
        SO_BINDTODEVICE = None
84
 
 
85
 
 
86
 
version = "1.3.1"
87
 
 
88
 
#logger = logging.getLogger('mandos')
 
63
 
 
64
# Brief description of the operation of this program:
 
65
 
66
# This server announces itself as a Zeroconf service.  Connecting
 
67
# clients use the TLS protocol, with the unusual quirk that this
 
68
# server program acts as a TLS "client" while a connecting client acts
 
69
# as a TLS "server".  The client (acting as a TLS "server") must
 
70
# supply an OpenPGP certificate, and the fingerprint of this
 
71
# certificate is used by this server to look up (in a list read from a
 
72
# file at start time) which binary blob to give the client.  No other
 
73
# authentication or authorization is done by this server.
 
74
 
 
75
 
89
76
logger = logging.Logger('mandos')
90
 
syslogger = (logging.handlers.SysLogHandler
91
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
92
 
              address = str("/dev/log")))
93
 
syslogger.setFormatter(logging.Formatter
94
 
                       ('Mandos [%(process)d]: %(levelname)s:'
95
 
                        ' %(message)s'))
 
77
syslogger = logging.handlers.SysLogHandler\
 
78
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
 
79
syslogger.setFormatter(logging.Formatter\
 
80
                        ('%(levelname)s: %(message)s'))
96
81
logger.addHandler(syslogger)
 
82
del syslogger
97
83
 
98
 
console = logging.StreamHandler()
99
 
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
100
 
                                       ' %(levelname)s:'
101
 
                                       ' %(message)s'))
102
 
logger.addHandler(console)
103
84
 
104
85
class AvahiError(Exception):
105
 
    def __init__(self, value, *args, **kwargs):
 
86
    def __init__(self, value):
106
87
        self.value = value
107
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
108
 
    def __unicode__(self):
109
 
        return unicode(repr(self.value))
 
88
    def __str__(self):
 
89
        return repr(self.value)
110
90
 
111
91
class AvahiServiceError(AvahiError):
112
92
    pass
116
96
 
117
97
 
118
98
class AvahiService(object):
119
 
    """An Avahi (Zeroconf) service.
120
 
    
121
 
    Attributes:
 
99
    """
122
100
    interface: integer; avahi.IF_UNSPEC or an interface index.
123
101
               Used to optionally bind to the specified interface.
124
 
    name: string; Example: 'Mandos'
125
 
    type: string; Example: '_mandos._tcp'.
126
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
127
 
    port: integer; what port to announce
128
 
    TXT: list of strings; TXT record for the service
129
 
    domain: string; Domain to publish on, default to .local if empty.
130
 
    host: string; Host to publish records for, default is localhost
131
 
    max_renames: integer; maximum number of renames
132
 
    rename_count: integer; counter so we only rename after collisions
133
 
                  a sensible number of times
134
 
    group: D-Bus Entry Group
135
 
    server: D-Bus Server
136
 
    bus: dbus.SystemBus()
 
102
    name = string; Example: "Mandos"
 
103
    type = string; Example: "_mandos._tcp".
 
104
                   See <http://www.dns-sd.org/ServiceTypes.html>
 
105
    port = integer; what port to announce
 
106
    TXT = list of strings; TXT record for the service
 
107
    domain = string; Domain to publish on, default to .local if empty.
 
108
    host = string; Host to publish records for, default to localhost
 
109
                   if empty.
 
110
    max_renames = integer; maximum number of renames
 
111
    rename_count = integer; counter so we only rename after collisions
 
112
                   a sensible number of times
137
113
    """
138
114
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
139
 
                 servicetype = None, port = None, TXT = None,
140
 
                 domain = "", host = "", max_renames = 32768,
141
 
                 protocol = avahi.PROTO_UNSPEC, bus = None):
 
115
                 type = None, port = None, TXT = None, domain = "",
 
116
                 host = "", max_renames = 12):
 
117
        """An Avahi (Zeroconf) service. """
142
118
        self.interface = interface
143
119
        self.name = name
144
 
        self.type = servicetype
 
120
        self.type = type
145
121
        self.port = port
146
 
        self.TXT = TXT if TXT is not None else []
 
122
        if TXT is None:
 
123
            self.TXT = []
 
124
        else:
 
125
            self.TXT = TXT
147
126
        self.domain = domain
148
127
        self.host = host
149
128
        self.rename_count = 0
150
 
        self.max_renames = max_renames
151
 
        self.protocol = protocol
152
 
        self.group = None       # our entry group
153
 
        self.server = None
154
 
        self.bus = bus
155
 
        self.entry_group_state_changed_match = None
156
129
    def rename(self):
157
130
        """Derived from the Avahi example code"""
158
131
        if self.rename_count >= self.max_renames:
159
 
            logger.critical("No suitable Zeroconf service name found"
160
 
                            " after %i retries, exiting.",
161
 
                            self.rename_count)
 
132
            logger.critical(u"No suitable service name found after %i"
 
133
                            u" retries, exiting.", rename_count)
162
134
            raise AvahiServiceError("Too many renames")
163
 
        self.name = unicode(self.server.GetAlternativeServiceName(self.name))
164
 
        logger.info("Changing Zeroconf service name to %r ...",
165
 
                    self.name)
166
 
        syslogger.setFormatter(logging.Formatter
167
 
                               ('Mandos (%s) [%%(process)d]:'
168
 
                                ' %%(levelname)s: %%(message)s'
169
 
                                % self.name))
 
135
        name = server.GetAlternativeServiceName(name)
 
136
        logger.notice(u"Changing name to %r ...", name)
170
137
        self.remove()
171
 
        try:
172
 
            self.add()
173
 
        except dbus.exceptions.DBusException as error:
174
 
            logger.critical("DBusException: %s", error)
175
 
            self.cleanup()
176
 
            os._exit(1)
 
138
        self.add()
177
139
        self.rename_count += 1
178
140
    def remove(self):
179
141
        """Derived from the Avahi example code"""
180
 
        if self.entry_group_state_changed_match is not None:
181
 
            self.entry_group_state_changed_match.remove()
182
 
            self.entry_group_state_changed_match = None
183
 
        if self.group is not None:
184
 
            self.group.Reset()
 
142
        if group is not None:
 
143
            group.Reset()
185
144
    def add(self):
186
145
        """Derived from the Avahi example code"""
187
 
        self.remove()
188
 
        if self.group is None:
189
 
            self.group = dbus.Interface(
190
 
                self.bus.get_object(avahi.DBUS_NAME,
191
 
                                    self.server.EntryGroupNew()),
192
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
193
 
        self.entry_group_state_changed_match = (
194
 
            self.group.connect_to_signal(
195
 
                'StateChanged', self .entry_group_state_changed))
196
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
197
 
                     self.name, self.type)
198
 
        self.group.AddService(
199
 
            self.interface,
200
 
            self.protocol,
201
 
            dbus.UInt32(0),     # flags
202
 
            self.name, self.type,
203
 
            self.domain, self.host,
204
 
            dbus.UInt16(self.port),
205
 
            avahi.string_array_to_txt_array(self.TXT))
206
 
        self.group.Commit()
207
 
    def entry_group_state_changed(self, state, error):
208
 
        """Derived from the Avahi example code"""
209
 
        logger.debug("Avahi entry group state change: %i", state)
210
 
        
211
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
212
 
            logger.debug("Zeroconf service established.")
213
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
214
 
            logger.info("Zeroconf service name collision.")
215
 
            self.rename()
216
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
217
 
            logger.critical("Avahi: Error in group state changed %s",
218
 
                            unicode(error))
219
 
            raise AvahiGroupError("State changed: %s"
220
 
                                  % unicode(error))
221
 
    def cleanup(self):
222
 
        """Derived from the Avahi example code"""
223
 
        if self.group is not None:
224
 
            try:
225
 
                self.group.Free()
226
 
            except (dbus.exceptions.UnknownMethodException,
227
 
                    dbus.exceptions.DBusException) as e:
228
 
                pass
229
 
            self.group = None
230
 
        self.remove()
231
 
    def server_state_changed(self, state, error=None):
232
 
        """Derived from the Avahi example code"""
233
 
        logger.debug("Avahi server state change: %i", state)
234
 
        bad_states = { avahi.SERVER_INVALID:
235
 
                           "Zeroconf server invalid",
236
 
                       avahi.SERVER_REGISTERING: None,
237
 
                       avahi.SERVER_COLLISION:
238
 
                           "Zeroconf server name collision",
239
 
                       avahi.SERVER_FAILURE:
240
 
                           "Zeroconf server failure" }
241
 
        if state in bad_states:
242
 
            if bad_states[state] is not None:
243
 
                if error is None:
244
 
                    logger.error(bad_states[state])
245
 
                else:
246
 
                    logger.error(bad_states[state] + ": %r", error)
247
 
            self.cleanup()
248
 
        elif state == avahi.SERVER_RUNNING:
249
 
            self.add()
250
 
        else:
251
 
            if error is None:
252
 
                logger.debug("Unknown state: %r", state)
253
 
            else:
254
 
                logger.debug("Unknown state: %r: %r", state, error)
255
 
    def activate(self):
256
 
        """Derived from the Avahi example code"""
257
 
        if self.server is None:
258
 
            self.server = dbus.Interface(
259
 
                self.bus.get_object(avahi.DBUS_NAME,
260
 
                                    avahi.DBUS_PATH_SERVER,
261
 
                                    follow_name_owner_changes=True),
262
 
                avahi.DBUS_INTERFACE_SERVER)
263
 
        self.server.connect_to_signal("StateChanged",
264
 
                                 self.server_state_changed)
265
 
        self.server_state_changed(self.server.GetState())
266
 
 
267
 
 
268
 
def _timedelta_to_milliseconds(td):
269
 
    "Convert a datetime.timedelta() to milliseconds"
270
 
    return ((td.days * 24 * 60 * 60 * 1000)
271
 
            + (td.seconds * 1000)
272
 
            + (td.microseconds // 1000))
273
 
        
 
146
        global group
 
147
        if group is None:
 
148
            group = dbus.Interface\
 
149
                    (bus.get_object(avahi.DBUS_NAME,
 
150
                                    server.EntryGroupNew()),
 
151
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
152
            group.connect_to_signal('StateChanged',
 
153
                                    entry_group_state_changed)
 
154
        logger.debug(u"Adding service '%s' of type '%s' ...",
 
155
                     service.name, service.type)
 
156
        group.AddService(
 
157
                self.interface,         # interface
 
158
                avahi.PROTO_INET6,      # protocol
 
159
                dbus.UInt32(0),         # flags
 
160
                self.name, self.type,
 
161
                self.domain, self.host,
 
162
                dbus.UInt16(self.port),
 
163
                avahi.string_array_to_txt_array(self.TXT))
 
164
        group.Commit()
 
165
 
 
166
# From the Avahi example code:
 
167
group = None                            # our entry group
 
168
# End of Avahi example code
 
169
 
 
170
 
274
171
class Client(object):
275
172
    """A representation of a client host served by this server.
276
 
    
277
173
    Attributes:
278
 
    _approved:   bool(); 'None' if not yet approved/disapproved
279
 
    approval_delay: datetime.timedelta(); Time to wait for approval
280
 
    approval_duration: datetime.timedelta(); Duration of one approval
281
 
    checker:    subprocess.Popen(); a running checker process used
282
 
                                    to see if the client lives.
283
 
                                    'None' if no process is running.
284
 
    checker_callback_tag: a gobject event source tag, or None
285
 
    checker_command: string; External command which is run to check
286
 
                     if client lives.  %() expansions are done at
 
174
    name:      string; from the config file, used in log messages
 
175
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
176
                 uniquely identify the client
 
177
    secret:    bytestring; sent verbatim (over TLS) to client
 
178
    fqdn:      string (FQDN); available for use by the checker command
 
179
    created:   datetime.datetime(); object creation, not client host
 
180
    last_checked_ok: datetime.datetime() or None if not yet checked OK
 
181
    timeout:   datetime.timedelta(); How long from last_checked_ok
 
182
                                     until this client is invalid
 
183
    interval:  datetime.timedelta(); How often to start a new checker
 
184
    stop_hook: If set, called by stop() as stop_hook(self)
 
185
    checker:   subprocess.Popen(); a running checker process used
 
186
                                   to see if the client lives.
 
187
                                   'None' if no process is running.
 
188
    checker_initiator_tag: a gobject event source tag, or None
 
189
    stop_initiator_tag:    - '' -
 
190
    checker_callback_tag:  - '' -
 
191
    checker_command: string; External command which is run to check if
 
192
                     client lives.  %() expansions are done at
287
193
                     runtime with vars(self) as dict, so that for
288
194
                     instance %(name)s can be used in the command.
289
 
    checker_initiator_tag: a gobject event source tag, or None
290
 
    created:    datetime.datetime(); (UTC) object creation
291
 
    current_checker_command: string; current running checker_command
292
 
    disable_hook:  If set, called by disable() as disable_hook(self)
293
 
    disable_initiator_tag: a gobject event source tag, or None
294
 
    enabled:    bool()
295
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
296
 
                 uniquely identify the client
297
 
    host:       string; available for use by the checker command
298
 
    interval:   datetime.timedelta(); How often to start a new checker
299
 
    last_approval_request: datetime.datetime(); (UTC) or None
300
 
    last_checked_ok: datetime.datetime(); (UTC) or None
301
 
    last_enabled: datetime.datetime(); (UTC)
302
 
    name:       string; from the config file, used in log messages and
303
 
                        D-Bus identifiers
304
 
    secret:     bytestring; sent verbatim (over TLS) to client
305
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
306
 
                                      until this client is disabled
307
 
    extended_timeout:   extra long timeout when password has been sent
308
 
    runtime_expansions: Allowed attributes for runtime expansion.
309
 
    expires:    datetime.datetime(); time (UTC) when a client will be
310
 
                disabled, or None
 
195
    Private attibutes:
 
196
    _timeout: Real variable for 'timeout'
 
197
    _interval: Real variable for 'interval'
 
198
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
199
    _interval_milliseconds: - '' -
311
200
    """
312
 
    
313
 
    runtime_expansions = ("approval_delay", "approval_duration",
314
 
                          "created", "enabled", "fingerprint",
315
 
                          "host", "interval", "last_checked_ok",
316
 
                          "last_enabled", "name", "timeout")
317
 
    
318
 
    def timeout_milliseconds(self):
319
 
        "Return the 'timeout' attribute in milliseconds"
320
 
        return _timedelta_to_milliseconds(self.timeout)
321
 
    
322
 
    def extended_timeout_milliseconds(self):
323
 
        "Return the 'extended_timeout' attribute in milliseconds"
324
 
        return _timedelta_to_milliseconds(self.extended_timeout)    
325
 
    
326
 
    def interval_milliseconds(self):
327
 
        "Return the 'interval' attribute in milliseconds"
328
 
        return _timedelta_to_milliseconds(self.interval)
329
 
    
330
 
    def approval_delay_milliseconds(self):
331
 
        return _timedelta_to_milliseconds(self.approval_delay)
332
 
    
333
 
    def __init__(self, name = None, disable_hook=None, config=None):
334
 
        """Note: the 'checker' key in 'config' sets the
335
 
        'checker_command' attribute and *not* the 'checker'
336
 
        attribute."""
 
201
    def _set_timeout(self, timeout):
 
202
        "Setter function for 'timeout' attribute"
 
203
        self._timeout = timeout
 
204
        self._timeout_milliseconds = ((self.timeout.days
 
205
                                       * 24 * 60 * 60 * 1000)
 
206
                                      + (self.timeout.seconds * 1000)
 
207
                                      + (self.timeout.microseconds
 
208
                                         // 1000))
 
209
    timeout = property(lambda self: self._timeout,
 
210
                       _set_timeout)
 
211
    del _set_timeout
 
212
    def _set_interval(self, interval):
 
213
        "Setter function for 'interval' attribute"
 
214
        self._interval = interval
 
215
        self._interval_milliseconds = ((self.interval.days
 
216
                                        * 24 * 60 * 60 * 1000)
 
217
                                       + (self.interval.seconds
 
218
                                          * 1000)
 
219
                                       + (self.interval.microseconds
 
220
                                          // 1000))
 
221
    interval = property(lambda self: self._interval,
 
222
                        _set_interval)
 
223
    del _set_interval
 
224
    def __init__(self, name=None, stop_hook=None, fingerprint=None,
 
225
                 secret=None, secfile=None, fqdn=None, timeout=None,
 
226
                 interval=-1, checker=None):
 
227
        """Note: the 'checker' argument sets the 'checker_command'
 
228
        attribute and not the 'checker' attribute.."""
337
229
        self.name = name
338
 
        if config is None:
339
 
            config = {}
340
 
        logger.debug("Creating client %r", self.name)
341
 
        # Uppercase and remove spaces from fingerprint for later
342
 
        # comparison purposes with return value from the fingerprint()
343
 
        # function
344
 
        self.fingerprint = (config["fingerprint"].upper()
345
 
                            .replace(" ", ""))
346
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
347
 
        if "secret" in config:
348
 
            self.secret = config["secret"].decode("base64")
349
 
        elif "secfile" in config:
350
 
            with open(os.path.expanduser(os.path.expandvars
351
 
                                         (config["secfile"])),
352
 
                      "rb") as secfile:
353
 
                self.secret = secfile.read()
 
230
        logger.debug(u"Creating client %r", self.name)
 
231
        # Uppercase and remove spaces from fingerprint
 
232
        # for later comparison purposes with return value of
 
233
        # the fingerprint() function
 
234
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
235
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
 
236
        if secret:
 
237
            self.secret = secret.decode(u"base64")
 
238
        elif secfile:
 
239
            sf = open(secfile)
 
240
            self.secret = sf.read()
 
241
            sf.close()
354
242
        else:
355
 
            raise TypeError("No secret or secfile for client %s"
 
243
            raise TypeError(u"No secret or secfile for client %s"
356
244
                            % self.name)
357
 
        self.host = config.get("host", "")
358
 
        self.created = datetime.datetime.utcnow()
359
 
        self.enabled = False
360
 
        self.last_approval_request = None
361
 
        self.last_enabled = None
 
245
        self.fqdn = fqdn
 
246
        self.created = datetime.datetime.now()
362
247
        self.last_checked_ok = None
363
 
        self.timeout = string_to_delta(config["timeout"])
364
 
        self.extended_timeout = string_to_delta(config["extended_timeout"])
365
 
        self.interval = string_to_delta(config["interval"])
366
 
        self.disable_hook = disable_hook
 
248
        self.timeout = string_to_delta(timeout)
 
249
        self.interval = string_to_delta(interval)
 
250
        self.stop_hook = stop_hook
367
251
        self.checker = None
368
252
        self.checker_initiator_tag = None
369
 
        self.disable_initiator_tag = None
370
 
        self.expires = None
 
253
        self.stop_initiator_tag = None
371
254
        self.checker_callback_tag = None
372
 
        self.checker_command = config["checker"]
373
 
        self.current_checker_command = None
374
 
        self.last_connect = None
375
 
        self._approved = None
376
 
        self.approved_by_default = config.get("approved_by_default",
377
 
                                              True)
378
 
        self.approvals_pending = 0
379
 
        self.approval_delay = string_to_delta(
380
 
            config["approval_delay"])
381
 
        self.approval_duration = string_to_delta(
382
 
            config["approval_duration"])
383
 
        self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
384
 
    
385
 
    def send_changedstate(self):
386
 
        self.changedstate.acquire()
387
 
        self.changedstate.notify_all()
388
 
        self.changedstate.release()
389
 
        
390
 
    def enable(self):
 
255
        self.check_command = checker
 
256
    def start(self):
391
257
        """Start this client's checker and timeout hooks"""
392
 
        if getattr(self, "enabled", False):
393
 
            # Already enabled
394
 
            return
395
 
        self.send_changedstate()
396
258
        # Schedule a new checker to be started an 'interval' from now,
397
259
        # and every interval from then on.
398
 
        self.checker_initiator_tag = (gobject.timeout_add
399
 
                                      (self.interval_milliseconds(),
400
 
                                       self.start_checker))
401
 
        # Schedule a disable() when 'timeout' has passed
402
 
        self.expires = datetime.datetime.utcnow() + self.timeout
403
 
        self.disable_initiator_tag = (gobject.timeout_add
404
 
                                   (self.timeout_milliseconds(),
405
 
                                    self.disable))
406
 
        self.enabled = True
407
 
        self.last_enabled = datetime.datetime.utcnow()
 
260
        self.checker_initiator_tag = gobject.timeout_add\
 
261
                                     (self._interval_milliseconds,
 
262
                                      self.start_checker)
408
263
        # Also start a new checker *right now*.
409
264
        self.start_checker()
410
 
    
411
 
    def disable(self, quiet=True):
412
 
        """Disable this client."""
413
 
        if not getattr(self, "enabled", False):
 
265
        # Schedule a stop() when 'timeout' has passed
 
266
        self.stop_initiator_tag = gobject.timeout_add\
 
267
                                  (self._timeout_milliseconds,
 
268
                                   self.stop)
 
269
    def stop(self):
 
270
        """Stop this client.
 
271
        The possibility that a client might be restarted is left open,
 
272
        but not currently used."""
 
273
        # If this client doesn't have a secret, it is already stopped.
 
274
        if self.secret:
 
275
            logger.debug(u"Stopping client %s", self.name)
 
276
            self.secret = None
 
277
        else:
414
278
            return False
415
 
        if not quiet:
416
 
            self.send_changedstate()
417
 
        if not quiet:
418
 
            logger.info("Disabling client %s", self.name)
419
 
        if getattr(self, "disable_initiator_tag", False):
420
 
            gobject.source_remove(self.disable_initiator_tag)
421
 
            self.disable_initiator_tag = None
422
 
        self.expires = None
 
279
        if getattr(self, "stop_initiator_tag", False):
 
280
            gobject.source_remove(self.stop_initiator_tag)
 
281
            self.stop_initiator_tag = None
423
282
        if getattr(self, "checker_initiator_tag", False):
424
283
            gobject.source_remove(self.checker_initiator_tag)
425
284
            self.checker_initiator_tag = None
426
285
        self.stop_checker()
427
 
        if self.disable_hook:
428
 
            self.disable_hook(self)
429
 
        self.enabled = False
 
286
        if self.stop_hook:
 
287
            self.stop_hook(self)
430
288
        # Do not run this again if called by a gobject.timeout_add
431
289
        return False
432
 
    
433
290
    def __del__(self):
434
 
        self.disable_hook = None
435
 
        self.disable()
436
 
    
437
 
    def checker_callback(self, pid, condition, command):
 
291
        self.stop_hook = None
 
292
        self.stop()
 
293
    def checker_callback(self, pid, condition):
438
294
        """The checker has completed, so take appropriate actions."""
 
295
        now = datetime.datetime.now()
439
296
        self.checker_callback_tag = None
440
297
        self.checker = None
441
 
        if os.WIFEXITED(condition):
442
 
            exitstatus = os.WEXITSTATUS(condition)
443
 
            if exitstatus == 0:
444
 
                logger.info("Checker for %(name)s succeeded",
445
 
                            vars(self))
446
 
                self.checked_ok()
447
 
            else:
448
 
                logger.info("Checker for %(name)s failed",
449
 
                            vars(self))
450
 
        else:
451
 
            logger.warning("Checker for %(name)s crashed?",
 
298
        if os.WIFEXITED(condition) \
 
299
               and (os.WEXITSTATUS(condition) == 0):
 
300
            logger.debug(u"Checker for %(name)s succeeded",
 
301
                         vars(self))
 
302
            self.last_checked_ok = now
 
303
            gobject.source_remove(self.stop_initiator_tag)
 
304
            self.stop_initiator_tag = gobject.timeout_add\
 
305
                                      (self._timeout_milliseconds,
 
306
                                       self.stop)
 
307
        elif not os.WIFEXITED(condition):
 
308
            logger.warning(u"Checker for %(name)s crashed?",
452
309
                           vars(self))
453
 
    
454
 
    def checked_ok(self, timeout=None):
455
 
        """Bump up the timeout for this client.
456
 
        
457
 
        This should only be called when the client has been seen,
458
 
        alive and well.
459
 
        """
460
 
        if timeout is None:
461
 
            timeout = self.timeout
462
 
        self.last_checked_ok = datetime.datetime.utcnow()
463
 
        gobject.source_remove(self.disable_initiator_tag)
464
 
        self.expires = datetime.datetime.utcnow() + timeout
465
 
        self.disable_initiator_tag = (gobject.timeout_add
466
 
                                      (_timedelta_to_milliseconds(timeout),
467
 
                                       self.disable))
468
 
    
469
 
    def need_approval(self):
470
 
        self.last_approval_request = datetime.datetime.utcnow()
471
 
    
 
310
        else:
 
311
            logger.debug(u"Checker for %(name)s failed",
 
312
                         vars(self))
472
313
    def start_checker(self):
473
314
        """Start a new checker subprocess if one is not running.
474
 
        
475
315
        If a checker already exists, leave it running and do
476
316
        nothing."""
477
317
        # The reason for not killing a running checker is that if we
480
320
        # client would inevitably timeout, since no checker would get
481
321
        # a chance to run to completion.  If we instead leave running
482
322
        # checkers alone, the checker would have to take more time
483
 
        # than 'timeout' for the client to be disabled, which is as it
484
 
        # should be.
485
 
        
486
 
        # If a checker exists, make sure it is not a zombie
487
 
        try:
488
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
489
 
        except (AttributeError, OSError) as error:
490
 
            if (isinstance(error, OSError)
491
 
                and error.errno != errno.ECHILD):
492
 
                raise error
493
 
        else:
494
 
            if pid:
495
 
                logger.warning("Checker was a zombie")
496
 
                gobject.source_remove(self.checker_callback_tag)
497
 
                self.checker_callback(pid, status,
498
 
                                      self.current_checker_command)
499
 
        # Start a new checker if needed
 
323
        # than 'timeout' for the client to be declared invalid, which
 
324
        # is as it should be.
500
325
        if self.checker is None:
501
326
            try:
502
 
                # In case checker_command has exactly one % operator
503
 
                command = self.checker_command % self.host
 
327
                # In case check_command has exactly one % operator
 
328
                command = self.check_command % self.fqdn
504
329
            except TypeError:
505
330
                # Escape attributes for the shell
506
 
                escaped_attrs = dict(
507
 
                    (attr,
508
 
                     re.escape(unicode(str(getattr(self, attr, "")),
509
 
                                       errors=
510
 
                                       'replace')))
511
 
                    for attr in
512
 
                    self.runtime_expansions)
513
 
                
 
331
                escaped_attrs = dict((key, re.escape(str(val)))
 
332
                                     for key, val in
 
333
                                     vars(self).iteritems())
514
334
                try:
515
 
                    command = self.checker_command % escaped_attrs
516
 
                except TypeError as error:
517
 
                    logger.error('Could not format string "%s":'
518
 
                                 ' %s', self.checker_command, error)
 
335
                    command = self.check_command % escaped_attrs
 
336
                except TypeError, error:
 
337
                    logger.error(u'Could not format string "%s":'
 
338
                                 u' %s', self.check_command, error)
519
339
                    return True # Try again later
520
 
            self.current_checker_command = command
521
340
            try:
522
 
                logger.info("Starting checker %r for %s",
523
 
                            command, self.name)
524
 
                # We don't need to redirect stdout and stderr, since
525
 
                # in normal mode, that is already done by daemon(),
526
 
                # and in debug mode we don't want to.  (Stdin is
527
 
                # always replaced by /dev/null.)
 
341
                logger.debug(u"Starting checker %r for %s",
 
342
                             command, self.name)
528
343
                self.checker = subprocess.Popen(command,
529
344
                                                close_fds=True,
530
345
                                                shell=True, cwd="/")
531
 
                self.checker_callback_tag = (gobject.child_watch_add
532
 
                                             (self.checker.pid,
533
 
                                              self.checker_callback,
534
 
                                              data=command))
535
 
                # The checker may have completed before the gobject
536
 
                # watch was added.  Check for this.
537
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
538
 
                if pid:
539
 
                    gobject.source_remove(self.checker_callback_tag)
540
 
                    self.checker_callback(pid, status, command)
541
 
            except OSError as error:
542
 
                logger.error("Failed to start subprocess: %s",
 
346
                self.checker_callback_tag = gobject.child_watch_add\
 
347
                                            (self.checker.pid,
 
348
                                             self.checker_callback)
 
349
            except subprocess.OSError, error:
 
350
                logger.error(u"Failed to start subprocess: %s",
543
351
                             error)
544
352
        # Re-run this periodically if run by gobject.timeout_add
545
353
        return True
546
 
    
547
354
    def stop_checker(self):
548
355
        """Force the checker process, if any, to stop."""
549
356
        if self.checker_callback_tag:
554
361
        logger.debug("Stopping checker for %(name)s", vars(self))
555
362
        try:
556
363
            os.kill(self.checker.pid, signal.SIGTERM)
557
 
            #time.sleep(0.5)
 
364
            #os.sleep(0.5)
558
365
            #if self.checker.poll() is None:
559
366
            #    os.kill(self.checker.pid, signal.SIGKILL)
560
 
        except OSError as error:
 
367
        except OSError, error:
561
368
            if error.errno != errno.ESRCH: # No such process
562
369
                raise
563
370
        self.checker = None
564
 
 
565
 
 
566
 
def dbus_service_property(dbus_interface, signature="v",
567
 
                          access="readwrite", byte_arrays=False):
568
 
    """Decorators for marking methods of a DBusObjectWithProperties to
569
 
    become properties on the D-Bus.
570
 
    
571
 
    The decorated method will be called with no arguments by "Get"
572
 
    and with one argument by "Set".
573
 
    
574
 
    The parameters, where they are supported, are the same as
575
 
    dbus.service.method, except there is only "signature", since the
576
 
    type from Get() and the type sent to Set() is the same.
577
 
    """
578
 
    # Encoding deeply encoded byte arrays is not supported yet by the
579
 
    # "Set" method, so we fail early here:
580
 
    if byte_arrays and signature != "ay":
581
 
        raise ValueError("Byte arrays not supported for non-'ay'"
582
 
                         " signature %r" % signature)
583
 
    def decorator(func):
584
 
        func._dbus_is_property = True
585
 
        func._dbus_interface = dbus_interface
586
 
        func._dbus_signature = signature
587
 
        func._dbus_access = access
588
 
        func._dbus_name = func.__name__
589
 
        if func._dbus_name.endswith("_dbus_property"):
590
 
            func._dbus_name = func._dbus_name[:-14]
591
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
592
 
        return func
593
 
    return decorator
594
 
 
595
 
 
596
 
class DBusPropertyException(dbus.exceptions.DBusException):
597
 
    """A base class for D-Bus property-related exceptions
598
 
    """
599
 
    def __unicode__(self):
600
 
        return unicode(str(self))
601
 
 
602
 
 
603
 
class DBusPropertyAccessException(DBusPropertyException):
604
 
    """A property's access permissions disallows an operation.
605
 
    """
606
 
    pass
607
 
 
608
 
 
609
 
class DBusPropertyNotFound(DBusPropertyException):
610
 
    """An attempt was made to access a non-existing property.
611
 
    """
612
 
    pass
613
 
 
614
 
 
615
 
class DBusObjectWithProperties(dbus.service.Object):
616
 
    """A D-Bus object with properties.
617
 
    
618
 
    Classes inheriting from this can use the dbus_service_property
619
 
    decorator to expose methods as D-Bus properties.  It exposes the
620
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
621
 
    """
622
 
    
623
 
    @staticmethod
624
 
    def _is_dbus_property(obj):
625
 
        return getattr(obj, "_dbus_is_property", False)
626
 
    
627
 
    def _get_all_dbus_properties(self):
628
 
        """Returns a generator of (name, attribute) pairs
629
 
        """
630
 
        return ((prop._dbus_name, prop)
631
 
                for name, prop in
632
 
                inspect.getmembers(self, self._is_dbus_property))
633
 
    
634
 
#    def _get_dbus_property(self, interface_name, property_name):
635
 
#        """Returns a bound method if one exists which is a D-Bus
636
 
#        property with the specified name and interface.
637
 
#        """
638
 
#        print("get_property({0!r}, {1!r}".format(interface_name, property_name),file=sys.stderr)
639
 
#        print(dir(self), sys.stderr)
640
 
#        for name in (property_name,
641
 
#                     property_name + "_dbus_property"):
642
 
#            prop = getattr(self, name, None)
643
 
#            if (prop is None
644
 
#                or not self._is_dbus_property(prop)
645
 
#                or prop._dbus_name != property_name
646
 
#                or (interface_name and prop._dbus_interface
647
 
#                    and interface_name != prop._dbus_interface)):
648
 
#                continue
649
 
#            return prop
650
 
#        # No such property
651
 
#        raise DBusPropertyNotFound(self.dbus_object_path + ":"
652
 
#                                   + interface_name + "."
653
 
#                                   + property_name)
654
 
 
655
 
    def _get_dbus_property(self, interface_name, property_name):
656
 
        """Returns a bound method if one exists which is a D-Bus
657
 
        property with the specified name and interface.
658
 
        """
659
 
        for name, value in inspect.getmembers(self, self._is_dbus_property):
660
 
            if value._dbus_name == property_name and value._dbus_interface == interface_name:
661
 
                return value
662
 
        
663
 
        # No such property
664
 
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
665
 
                                   + interface_name + "."
666
 
                                   + property_name)
667
 
 
668
 
    
669
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
670
 
                         out_signature="v")
671
 
    def Get(self, interface_name, property_name):
672
 
        """Standard D-Bus property Get() method, see D-Bus standard.
673
 
        """
674
 
        prop = self._get_dbus_property(interface_name, property_name)
675
 
        if prop._dbus_access == "write":
676
 
            raise DBusPropertyAccessException(property_name)
677
 
        value = prop()
678
 
        if not hasattr(value, "variant_level"):
679
 
            return value
680
 
        return type(value)(value, variant_level=value.variant_level+1)
681
 
    
682
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
683
 
    def Set(self, interface_name, property_name, value):
684
 
        """Standard D-Bus property Set() method, see D-Bus standard.
685
 
        """
686
 
        prop = self._get_dbus_property(interface_name, property_name)
687
 
        if prop._dbus_access == "read":
688
 
            raise DBusPropertyAccessException(property_name)
689
 
        if prop._dbus_get_args_options["byte_arrays"]:
690
 
            # The byte_arrays option is not supported yet on
691
 
            # signatures other than "ay".
692
 
            if prop._dbus_signature != "ay":
693
 
                raise ValueError
694
 
            value = dbus.ByteArray(''.join(unichr(byte)
695
 
                                           for byte in value))
696
 
        prop(value)
697
 
    
698
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
699
 
                         out_signature="a{sv}")
700
 
    def GetAll(self, interface_name):
701
 
        """Standard D-Bus property GetAll() method, see D-Bus
702
 
        standard.
703
 
        
704
 
        Note: Will not include properties with access="write".
705
 
        """
706
 
        all = {}
707
 
        for name, prop in self._get_all_dbus_properties():
708
 
            if (interface_name
709
 
                and interface_name != prop._dbus_interface):
710
 
                # Interface non-empty but did not match
711
 
                continue
712
 
            # Ignore write-only properties
713
 
            if prop._dbus_access == "write":
714
 
                continue
715
 
            value = prop()
716
 
            if not hasattr(value, "variant_level"):
717
 
                all[name] = value
718
 
                continue
719
 
            all[name] = type(value)(value, variant_level=
720
 
                                    value.variant_level+1)
721
 
        return dbus.Dictionary(all, signature="sv")
722
 
    
723
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
724
 
                         out_signature="s",
725
 
                         path_keyword='object_path',
726
 
                         connection_keyword='connection')
727
 
    def Introspect(self, object_path, connection):
728
 
        """Standard D-Bus method, overloaded to insert property tags.
729
 
        """
730
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
731
 
                                                   connection)
732
 
        try:
733
 
            document = xml.dom.minidom.parseString(xmlstring)
734
 
            def make_tag(document, name, prop):
735
 
                e = document.createElement("property")
736
 
                e.setAttribute("name", name)
737
 
                e.setAttribute("type", prop._dbus_signature)
738
 
                e.setAttribute("access", prop._dbus_access)
739
 
                return e
740
 
            for if_tag in document.getElementsByTagName("interface"):
741
 
                for tag in (make_tag(document, name, prop)
742
 
                            for name, prop
743
 
                            in self._get_all_dbus_properties()
744
 
                            if prop._dbus_interface
745
 
                            == if_tag.getAttribute("name")):
746
 
                    if_tag.appendChild(tag)
747
 
                # Add the names to the return values for the
748
 
                # "org.freedesktop.DBus.Properties" methods
749
 
                if (if_tag.getAttribute("name")
750
 
                    == "org.freedesktop.DBus.Properties"):
751
 
                    for cn in if_tag.getElementsByTagName("method"):
752
 
                        if cn.getAttribute("name") == "Get":
753
 
                            for arg in cn.getElementsByTagName("arg"):
754
 
                                if (arg.getAttribute("direction")
755
 
                                    == "out"):
756
 
                                    arg.setAttribute("name", "value")
757
 
                        elif cn.getAttribute("name") == "GetAll":
758
 
                            for arg in cn.getElementsByTagName("arg"):
759
 
                                if (arg.getAttribute("direction")
760
 
                                    == "out"):
761
 
                                    arg.setAttribute("name", "props")
762
 
            xmlstring = document.toxml("utf-8")
763
 
            document.unlink()
764
 
        except (AttributeError, xml.dom.DOMException,
765
 
                xml.parsers.expat.ExpatError) as error:
766
 
            logger.error("Failed to override Introspection method",
767
 
                         error)
768
 
        return xmlstring
769
 
 
770
 
 
771
 
def datetime_to_dbus (dt, variant_level=0):
772
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
773
 
    if dt is None:
774
 
        return dbus.String("", variant_level = variant_level)
775
 
    return dbus.String(dt.isoformat(),
776
 
                       variant_level=variant_level)
777
 
 
778
 
class transitional_clientdbus(DBusObjectWithProperties.__metaclass__):
779
 
    def __new__(mcs, name, bases, attr):
780
 
        for key, old_dbusobj in attr.items():
781
 
            new_interface = getattr(old_dbusobj, "_dbus_interface", "").replace("se.bsnet.fukt.", "se.recompile.")
782
 
            if getattr(old_dbusobj, "_dbus_is_signal", False):
783
 
                unwrappedfunc = dict(zip(old_dbusobj.func_code.co_freevars,
784
 
                                    old_dbusobj.__closure__))["func"].cell_contents
785
 
                newfunc = types.FunctionType(unwrappedfunc.func_code,
786
 
                                             unwrappedfunc.func_globals,
787
 
                                             unwrappedfunc.func_name,
788
 
                                             unwrappedfunc.func_defaults,
789
 
                                             unwrappedfunc.func_closure)
790
 
                new_dbusfunc = dbus.service.signal(
791
 
                    new_interface, old_dbusobj._dbus_signature)(newfunc)            
792
 
                attr["_transitional_{0}_1".format(key)] = new_dbusfunc
793
 
                attr["_transitional_{0}_0".format(key)] = old_dbusobj                
794
 
                def fixscope(func1, func2):
795
 
                    def newcall(*args, **kwargs):
796
 
                        func1(*args, **kwargs)
797
 
                        func2(*args, **kwargs)
798
 
                    return newcall
799
 
 
800
 
                attr[key] = fixscope(
801
 
                    old_dbusobj, attr["_transitional_{0}_1".format(key)])
802
 
            
803
 
            if getattr(old_dbusobj, "_dbus_is_method", False):
804
 
                new_dbusfunc = (dbus.service.method
805
 
                                (new_interface,
806
 
                                 old_dbusobj._dbus_in_signature,
807
 
                                 old_dbusobj._dbus_out_signature)
808
 
                                (types.FunctionType
809
 
                                 (old_dbusobj.func_code,
810
 
                                  old_dbusobj.func_globals,
811
 
                                  old_dbusobj.func_name,
812
 
                                  old_dbusobj.func_defaults,
813
 
                                  old_dbusobj.func_closure)))
814
 
 
815
 
                attr["_transitional_{0}".format(key)] = new_dbusfunc
816
 
            if getattr(old_dbusobj, "_dbus_is_property", False):
817
 
                new_dbusfunc = (dbus_service_property
818
 
                                (new_interface,
819
 
                                 old_dbusobj._dbus_signature,
820
 
                                 old_dbusobj._dbus_access,
821
 
                                 old_dbusobj._dbus_get_args_options["byte_arrays"])
822
 
                                (types.FunctionType
823
 
                                 (old_dbusobj.func_code,
824
 
                                  old_dbusobj.func_globals,
825
 
                                  old_dbusobj.func_name,
826
 
                                  old_dbusobj.func_defaults,
827
 
                                  old_dbusobj.func_closure)))
828
 
 
829
 
                attr["_transitional_{0}".format(key)] = new_dbusfunc
830
 
        return type.__new__(mcs, name, bases, attr)
831
 
 
832
 
class ClientDBus(Client, DBusObjectWithProperties):
833
 
    """A Client class using D-Bus
834
 
    
835
 
    Attributes:
836
 
    dbus_object_path: dbus.ObjectPath
837
 
    bus: dbus.SystemBus()
838
 
    """
839
 
    
840
 
    runtime_expansions = (Client.runtime_expansions
841
 
                          + ("dbus_object_path",))
842
 
 
843
 
    __metaclass__ = transitional_clientdbus
844
 
    
845
 
    # dbus.service.Object doesn't use super(), so we can't either.
846
 
    
847
 
    def __init__(self, bus = None, *args, **kwargs):
848
 
        self._approvals_pending = 0
849
 
        self.bus = bus
850
 
        Client.__init__(self, *args, **kwargs)
851
 
        # Only now, when this client is initialized, can it show up on
852
 
        # the D-Bus
853
 
        client_object_name = unicode(self.name).translate(
854
 
            {ord("."): ord("_"),
855
 
             ord("-"): ord("_")})
856
 
        self.dbus_object_path = (dbus.ObjectPath
857
 
                                 ("/clients/" + client_object_name))
858
 
        DBusObjectWithProperties.__init__(self, self.bus,
859
 
                                          self.dbus_object_path)
860
 
        
861
 
    def notifychangeproperty(transform_func,
862
 
                             dbus_name, type_func=lambda x: x,
863
 
                             variant_level=1):
864
 
        """ Modify a variable so that its a property that announce its
865
 
        changes to DBus.
866
 
        transform_fun: Function that takes a value and transform it to
867
 
                       DBus type.
868
 
        dbus_name: DBus name of the variable
869
 
        type_func: Function that transform the value before sending it
870
 
                   to DBus
871
 
        variant_level: DBus variant level. default: 1
872
 
        """
873
 
        real_value = [None,]
874
 
        def setter(self, value):
875
 
            old_value = real_value[0]
876
 
            real_value[0] = value
877
 
            if hasattr(self, "dbus_object_path"):
878
 
                if type_func(old_value) != type_func(real_value[0]):
879
 
                    dbus_value = transform_func(type_func(real_value[0]),
880
 
                                                variant_level)
881
 
                    self.PropertyChanged(dbus.String(dbus_name),
882
 
                                         dbus_value)
883
 
        
884
 
        return property(lambda self: real_value[0], setter)
885
 
    
886
 
    
887
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
888
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
889
 
                                             "ApprovalPending",
890
 
                                             type_func = bool)
891
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
892
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
893
 
                                        "LastEnabled")
894
 
    checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
895
 
                                   type_func = lambda checker: checker is not None)
896
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
897
 
                                           "LastCheckedOK")
898
 
    last_approval_request = notifychangeproperty(datetime_to_dbus,
899
 
                                                 "LastApprovalRequest")
900
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
901
 
                                               "ApprovedByDefault")
902
 
    approval_delay = notifychangeproperty(dbus.UInt16, "ApprovalDelay",
903
 
                                          type_func = _timedelta_to_milliseconds)
904
 
    approval_duration = notifychangeproperty(dbus.UInt16, "ApprovalDuration",
905
 
                                             type_func = _timedelta_to_milliseconds)
906
 
    host = notifychangeproperty(dbus.String, "Host")
907
 
    timeout = notifychangeproperty(dbus.UInt16, "Timeout",
908
 
                                   type_func = _timedelta_to_milliseconds)
909
 
    extended_timeout = notifychangeproperty(dbus.UInt16, "ExtendedTimeout",
910
 
                                            type_func = _timedelta_to_milliseconds)
911
 
    interval = notifychangeproperty(dbus.UInt16, "Interval",
912
 
                                    type_func = _timedelta_to_milliseconds)
913
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
914
 
    
915
 
    del notifychangeproperty
916
 
    
917
 
    def __del__(self, *args, **kwargs):
918
 
        try:
919
 
            self.remove_from_connection()
920
 
        except LookupError:
921
 
            pass
922
 
        if hasattr(DBusObjectWithProperties, "__del__"):
923
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
924
 
        Client.__del__(self, *args, **kwargs)
925
 
    
926
 
    def checker_callback(self, pid, condition, command,
927
 
                         *args, **kwargs):
928
 
        self.checker_callback_tag = None
929
 
        self.checker = None
930
 
        if os.WIFEXITED(condition):
931
 
            exitstatus = os.WEXITSTATUS(condition)
932
 
            # Emit D-Bus signal
933
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
934
 
                                  dbus.Int64(condition),
935
 
                                  dbus.String(command))
936
 
        else:
937
 
            # Emit D-Bus signal
938
 
            self.CheckerCompleted(dbus.Int16(-1),
939
 
                                  dbus.Int64(condition),
940
 
                                  dbus.String(command))
941
 
        
942
 
        return Client.checker_callback(self, pid, condition, command,
943
 
                                       *args, **kwargs)
944
 
    
945
 
    def start_checker(self, *args, **kwargs):
946
 
        old_checker = self.checker
947
 
        if self.checker is not None:
948
 
            old_checker_pid = self.checker.pid
949
 
        else:
950
 
            old_checker_pid = None
951
 
        r = Client.start_checker(self, *args, **kwargs)
952
 
        # Only if new checker process was started
953
 
        if (self.checker is not None
954
 
            and old_checker_pid != self.checker.pid):
955
 
            # Emit D-Bus signal
956
 
            self.CheckerStarted(self.current_checker_command)
957
 
        return r
958
 
    
959
 
    def _reset_approved(self):
960
 
        self._approved = None
961
 
        return False
962
 
    
963
 
    def approve(self, value=True):
964
 
        self.send_changedstate()
965
 
        self._approved = value
966
 
        gobject.timeout_add(_timedelta_to_milliseconds
967
 
                            (self.approval_duration),
968
 
                            self._reset_approved)
969
 
    
970
 
    
971
 
    ## D-Bus methods, signals & properties
972
 
    _interface = "se.bsnet.fukt.Mandos.Client"
973
 
 
974
 
    ## Signals
975
 
    
976
 
    # CheckerCompleted - signal
977
 
    @dbus.service.signal(_interface, signature="nxs")
978
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
979
 
        "D-Bus signal"
980
 
        pass
981
 
    
982
 
    # CheckerStarted - signal
983
 
    @dbus.service.signal(_interface, signature="s")
984
 
    def CheckerStarted(self, command):
985
 
        "D-Bus signal"
986
 
        pass
987
 
    
988
 
    # PropertyChanged - signal
989
 
    @dbus.service.signal(_interface, signature="sv")
990
 
    def PropertyChanged(self, property, value):
991
 
        "D-Bus signal"
992
 
        pass
993
 
    
994
 
    # GotSecret - signal
995
 
    @dbus.service.signal(_interface)
996
 
    def GotSecret(self):
997
 
        """D-Bus signal
998
 
        Is sent after a successful transfer of secret from the Mandos
999
 
        server to mandos-client
1000
 
        """
1001
 
        pass
1002
 
    
1003
 
    # Rejected - signal
1004
 
    @dbus.service.signal(_interface, signature="s")
1005
 
    def Rejected(self, reason):
1006
 
        "D-Bus signal"
1007
 
        pass
1008
 
    
1009
 
    # NeedApproval - signal
1010
 
    @dbus.service.signal(_interface, signature="tb")
1011
 
    def NeedApproval(self, timeout, default):
1012
 
        "D-Bus signal"
1013
 
        return self.need_approval()
1014
 
    
1015
 
    ## Methods
1016
 
    
1017
 
    # Approve - method
1018
 
    @dbus.service.method(_interface, in_signature="b")
1019
 
    def Approve(self, value):
1020
 
        self.approve(value)
1021
 
    
1022
 
    # CheckedOK - method
1023
 
    @dbus.service.method(_interface)
1024
 
    def CheckedOK(self):
1025
 
        self.checked_ok()
1026
 
    
1027
 
    # Enable - method
1028
 
    @dbus.service.method(_interface)
1029
 
    def Enable(self):
1030
 
        "D-Bus method"
1031
 
        self.enable()
1032
 
    
1033
 
    # StartChecker - method
1034
 
    @dbus.service.method(_interface)
1035
 
    def StartChecker(self):
1036
 
        "D-Bus method"
1037
 
        self.start_checker()
1038
 
    
1039
 
    # Disable - method
1040
 
    @dbus.service.method(_interface)
1041
 
    def Disable(self):
1042
 
        "D-Bus method"
1043
 
        self.disable()
1044
 
    
1045
 
    # StopChecker - method
1046
 
    @dbus.service.method(_interface)
1047
 
    def StopChecker(self):
1048
 
        self.stop_checker()
1049
 
    
1050
 
    ## Properties
1051
 
    
1052
 
    # ApprovalPending - property
1053
 
    @dbus_service_property(_interface, signature="b", access="read")
1054
 
    def ApprovalPending_dbus_property(self):
1055
 
        return dbus.Boolean(bool(self.approvals_pending))
1056
 
    
1057
 
    # ApprovedByDefault - property
1058
 
    @dbus_service_property(_interface, signature="b",
1059
 
                           access="readwrite")
1060
 
    def ApprovedByDefault_dbus_property(self, value=None):
1061
 
        if value is None:       # get
1062
 
            return dbus.Boolean(self.approved_by_default)
1063
 
        self.approved_by_default = bool(value)
1064
 
    
1065
 
    # ApprovalDelay - property
1066
 
    @dbus_service_property(_interface, signature="t",
1067
 
                           access="readwrite")
1068
 
    def ApprovalDelay_dbus_property(self, value=None):
1069
 
        if value is None:       # get
1070
 
            return dbus.UInt64(self.approval_delay_milliseconds())
1071
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
1072
 
    
1073
 
    # ApprovalDuration - property
1074
 
    @dbus_service_property(_interface, signature="t",
1075
 
                           access="readwrite")
1076
 
    def ApprovalDuration_dbus_property(self, value=None):
1077
 
        if value is None:       # get
1078
 
            return dbus.UInt64(_timedelta_to_milliseconds(
1079
 
                    self.approval_duration))
1080
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
1081
 
    
1082
 
    # Name - property
1083
 
    @dbus_service_property(_interface, signature="s", access="read")
1084
 
    def Name_dbus_property(self):
1085
 
        return dbus.String(self.name)
1086
 
    
1087
 
    # Fingerprint - property
1088
 
    @dbus_service_property(_interface, signature="s", access="read")
1089
 
    def Fingerprint_dbus_property(self):
1090
 
        return dbus.String(self.fingerprint)
1091
 
    
1092
 
    # Host - property
1093
 
    @dbus_service_property(_interface, signature="s",
1094
 
                           access="readwrite")
1095
 
    def Host_dbus_property(self, value=None):
1096
 
        if value is None:       # get
1097
 
            return dbus.String(self.host)
1098
 
        self.host = value
1099
 
    
1100
 
    # Created - property
1101
 
    @dbus_service_property(_interface, signature="s", access="read")
1102
 
    def Created_dbus_property(self):
1103
 
        return dbus.String(datetime_to_dbus(self.created))
1104
 
    
1105
 
    # LastEnabled - property
1106
 
    @dbus_service_property(_interface, signature="s", access="read")
1107
 
    def LastEnabled_dbus_property(self):
1108
 
        return datetime_to_dbus(self.last_enabled)
1109
 
    
1110
 
    # Enabled - property
1111
 
    @dbus_service_property(_interface, signature="b",
1112
 
                           access="readwrite")
1113
 
    def Enabled_dbus_property(self, value=None):
1114
 
        if value is None:       # get
1115
 
            return dbus.Boolean(self.enabled)
1116
 
        if value:
1117
 
            self.enable()
1118
 
        else:
1119
 
            self.disable()
1120
 
    
1121
 
    # LastCheckedOK - property
1122
 
    @dbus_service_property(_interface, signature="s",
1123
 
                           access="readwrite")
1124
 
    def LastCheckedOK_dbus_property(self, value=None):
1125
 
        if value is not None:
1126
 
            self.checked_ok()
1127
 
            return
1128
 
        return datetime_to_dbus(self.last_checked_ok)
1129
 
    
1130
 
    # Expires - property
1131
 
    @dbus_service_property(_interface, signature="s", access="read")
1132
 
    def Expires_dbus_property(self):
1133
 
        return datetime_to_dbus(self.expires)
1134
 
    
1135
 
    # LastApprovalRequest - property
1136
 
    @dbus_service_property(_interface, signature="s", access="read")
1137
 
    def LastApprovalRequest_dbus_property(self):
1138
 
        return datetime_to_dbus(self.last_approval_request)
1139
 
    
1140
 
    # Timeout - property
1141
 
    @dbus_service_property(_interface, signature="t",
1142
 
                           access="readwrite")
1143
 
    def Timeout_dbus_property(self, value=None):
1144
 
        if value is None:       # get
1145
 
            return dbus.UInt64(self.timeout_milliseconds())
1146
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1147
 
        if getattr(self, "disable_initiator_tag", None) is None:
1148
 
            return
1149
 
        # Reschedule timeout
1150
 
        gobject.source_remove(self.disable_initiator_tag)
1151
 
        self.disable_initiator_tag = None
1152
 
        self.expires = None
1153
 
        time_to_die = (self.
1154
 
                       _timedelta_to_milliseconds((self
1155
 
                                                   .last_checked_ok
1156
 
                                                   + self.timeout)
1157
 
                                                  - datetime.datetime
1158
 
                                                  .utcnow()))
1159
 
        if time_to_die <= 0:
1160
 
            # The timeout has passed
1161
 
            self.disable()
1162
 
        else:
1163
 
            self.expires = (datetime.datetime.utcnow()
1164
 
                            + datetime.timedelta(milliseconds = time_to_die))
1165
 
            self.disable_initiator_tag = (gobject.timeout_add
1166
 
                                          (time_to_die, self.disable))
1167
 
    
1168
 
    # ExtendedTimeout - property
1169
 
    @dbus_service_property(_interface, signature="t",
1170
 
                           access="readwrite")
1171
 
    def ExtendedTimeout_dbus_property(self, value=None):
1172
 
        if value is None:       # get
1173
 
            return dbus.UInt64(self.extended_timeout_milliseconds())
1174
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1175
 
    
1176
 
    # Interval - property
1177
 
    @dbus_service_property(_interface, signature="t",
1178
 
                           access="readwrite")
1179
 
    def Interval_dbus_property(self, value=None):
1180
 
        if value is None:       # get
1181
 
            return dbus.UInt64(self.interval_milliseconds())
1182
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1183
 
        if getattr(self, "checker_initiator_tag", None) is None:
1184
 
            return
1185
 
        # Reschedule checker run
1186
 
        gobject.source_remove(self.checker_initiator_tag)
1187
 
        self.checker_initiator_tag = (gobject.timeout_add
1188
 
                                      (value, self.start_checker))
1189
 
        self.start_checker()    # Start one now, too
1190
 
    
1191
 
    # Checker - property
1192
 
    @dbus_service_property(_interface, signature="s",
1193
 
                           access="readwrite")
1194
 
    def Checker_dbus_property(self, value=None):
1195
 
        if value is None:       # get
1196
 
            return dbus.String(self.checker_command)
1197
 
        self.checker_command = value
1198
 
    
1199
 
    # CheckerRunning - property
1200
 
    @dbus_service_property(_interface, signature="b",
1201
 
                           access="readwrite")
1202
 
    def CheckerRunning_dbus_property(self, value=None):
1203
 
        if value is None:       # get
1204
 
            return dbus.Boolean(self.checker is not None)
1205
 
        if value:
1206
 
            self.start_checker()
1207
 
        else:
1208
 
            self.stop_checker()
1209
 
    
1210
 
    # ObjectPath - property
1211
 
    @dbus_service_property(_interface, signature="o", access="read")
1212
 
    def ObjectPath_dbus_property(self):
1213
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1214
 
    
1215
 
    # Secret = property
1216
 
    @dbus_service_property(_interface, signature="ay",
1217
 
                           access="write", byte_arrays=True)
1218
 
    def Secret_dbus_property(self, value):
1219
 
        self.secret = str(value)
1220
 
    
1221
 
    del _interface
1222
 
 
1223
 
 
1224
 
class ProxyClient(object):
1225
 
    def __init__(self, child_pipe, fpr, address):
1226
 
        self._pipe = child_pipe
1227
 
        self._pipe.send(('init', fpr, address))
1228
 
        if not self._pipe.recv():
1229
 
            raise KeyError()
1230
 
    
1231
 
    def __getattribute__(self, name):
1232
 
        if(name == '_pipe'):
1233
 
            return super(ProxyClient, self).__getattribute__(name)
1234
 
        self._pipe.send(('getattr', name))
1235
 
        data = self._pipe.recv()
1236
 
        if data[0] == 'data':
1237
 
            return data[1]
1238
 
        if data[0] == 'function':
1239
 
            def func(*args, **kwargs):
1240
 
                self._pipe.send(('funcall', name, args, kwargs))
1241
 
                return self._pipe.recv()[1]
1242
 
            return func
1243
 
    
1244
 
    def __setattr__(self, name, value):
1245
 
        if(name == '_pipe'):
1246
 
            return super(ProxyClient, self).__setattr__(name, value)
1247
 
        self._pipe.send(('setattr', name, value))
1248
 
 
1249
 
 
1250
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1251
 
    """A class to handle client connections.
1252
 
    
1253
 
    Instantiated once for each connection to handle it.
 
371
    def still_valid(self):
 
372
        """Has the timeout not yet passed for this client?"""
 
373
        now = datetime.datetime.now()
 
374
        if self.last_checked_ok is None:
 
375
            return now < (self.created + self.timeout)
 
376
        else:
 
377
            return now < (self.last_checked_ok + self.timeout)
 
378
 
 
379
 
 
380
def peer_certificate(session):
 
381
    "Return the peer's OpenPGP certificate as a bytestring"
 
382
    # If not an OpenPGP certificate...
 
383
    if gnutls.library.functions.gnutls_certificate_type_get\
 
384
            (session._c_object) \
 
385
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
386
        # ...do the normal thing
 
387
        return session.peer_certificate
 
388
    list_size = ctypes.c_uint()
 
389
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
390
        (session._c_object, ctypes.byref(list_size))
 
391
    if list_size.value == 0:
 
392
        return None
 
393
    cert = cert_list[0]
 
394
    return ctypes.string_at(cert.data, cert.size)
 
395
 
 
396
 
 
397
def fingerprint(openpgp):
 
398
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
399
    # New empty GnuTLS certificate
 
400
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
401
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
402
        (ctypes.byref(crt))
 
403
    # New GnuTLS "datum" with the OpenPGP public key
 
404
    datum = gnutls.library.types.gnutls_datum_t\
 
405
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
406
                     ctypes.POINTER(ctypes.c_ubyte)),
 
407
         ctypes.c_uint(len(openpgp)))
 
408
    # Import the OpenPGP public key into the certificate
 
409
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
410
        (crt,
 
411
         ctypes.byref(datum),
 
412
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
413
    # New buffer for the fingerprint
 
414
    buffer = ctypes.create_string_buffer(20)
 
415
    buffer_length = ctypes.c_size_t()
 
416
    # Get the fingerprint from the certificate into the buffer
 
417
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
418
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
419
    # Deinit the certificate
 
420
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
421
    # Convert the buffer to a Python bytestring
 
422
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
423
    # Convert the bytestring to hexadecimal notation
 
424
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
425
    return hex_fpr
 
426
 
 
427
 
 
428
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
429
    """A TCP request handler class.
 
430
    Instantiated by IPv6_TCPServer for each request to handle it.
1254
431
    Note: This will run in its own forked process."""
1255
432
    
1256
433
    def handle(self):
1257
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1258
 
            logger.info("TCP connection from: %s",
1259
 
                        unicode(self.client_address))
1260
 
            logger.debug("Pipe FD: %d",
1261
 
                         self.server.child_pipe.fileno())
1262
 
            
1263
 
            session = (gnutls.connection
1264
 
                       .ClientSession(self.request,
1265
 
                                      gnutls.connection
1266
 
                                      .X509Credentials()))
1267
 
            
1268
 
            # Note: gnutls.connection.X509Credentials is really a
1269
 
            # generic GnuTLS certificate credentials object so long as
1270
 
            # no X.509 keys are added to it.  Therefore, we can use it
1271
 
            # here despite using OpenPGP certificates.
1272
 
            
1273
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
1274
 
            #                      "+AES-256-CBC", "+SHA1",
1275
 
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
1276
 
            #                      "+DHE-DSS"))
1277
 
            # Use a fallback default, since this MUST be set.
1278
 
            priority = self.server.gnutls_priority
1279
 
            if priority is None:
1280
 
                priority = "NORMAL"
1281
 
            (gnutls.library.functions
1282
 
             .gnutls_priority_set_direct(session._c_object,
1283
 
                                         priority, None))
1284
 
            
1285
 
            # Start communication using the Mandos protocol
1286
 
            # Get protocol number
1287
 
            line = self.request.makefile().readline()
1288
 
            logger.debug("Protocol version: %r", line)
1289
 
            try:
1290
 
                if int(line.strip().split()[0]) > 1:
1291
 
                    raise RuntimeError
1292
 
            except (ValueError, IndexError, RuntimeError) as error:
1293
 
                logger.error("Unknown protocol version: %s", error)
1294
 
                return
1295
 
            
1296
 
            # Start GnuTLS connection
1297
 
            try:
1298
 
                session.handshake()
1299
 
            except gnutls.errors.GNUTLSError as error:
1300
 
                logger.warning("Handshake failed: %s", error)
1301
 
                # Do not run session.bye() here: the session is not
1302
 
                # established.  Just abandon the request.
1303
 
                return
1304
 
            logger.debug("Handshake succeeded")
1305
 
            
1306
 
            approval_required = False
1307
 
            try:
1308
 
                try:
1309
 
                    fpr = self.fingerprint(self.peer_certificate
1310
 
                                           (session))
1311
 
                except (TypeError,
1312
 
                        gnutls.errors.GNUTLSError) as error:
1313
 
                    logger.warning("Bad certificate: %s", error)
1314
 
                    return
1315
 
                logger.debug("Fingerprint: %s", fpr)
1316
 
                
1317
 
                try:
1318
 
                    client = ProxyClient(child_pipe, fpr,
1319
 
                                         self.client_address)
1320
 
                except KeyError:
1321
 
                    return
1322
 
                
1323
 
                if client.approval_delay:
1324
 
                    delay = client.approval_delay
1325
 
                    client.approvals_pending += 1
1326
 
                    approval_required = True
1327
 
                
1328
 
                while True:
1329
 
                    if not client.enabled:
1330
 
                        logger.info("Client %s is disabled",
1331
 
                                       client.name)
1332
 
                        if self.server.use_dbus:
1333
 
                            # Emit D-Bus signal
1334
 
                            client.Rejected("Disabled")                    
1335
 
                        return
1336
 
                    
1337
 
                    if client._approved or not client.approval_delay:
1338
 
                        #We are approved or approval is disabled
1339
 
                        break
1340
 
                    elif client._approved is None:
1341
 
                        logger.info("Client %s needs approval",
1342
 
                                    client.name)
1343
 
                        if self.server.use_dbus:
1344
 
                            # Emit D-Bus signal
1345
 
                            client.NeedApproval(
1346
 
                                client.approval_delay_milliseconds(),
1347
 
                                client.approved_by_default)
1348
 
                    else:
1349
 
                        logger.warning("Client %s was not approved",
1350
 
                                       client.name)
1351
 
                        if self.server.use_dbus:
1352
 
                            # Emit D-Bus signal
1353
 
                            client.Rejected("Denied")
1354
 
                        return
1355
 
                    
1356
 
                    #wait until timeout or approved
1357
 
                    #x = float(client._timedelta_to_milliseconds(delay))
1358
 
                    time = datetime.datetime.now()
1359
 
                    client.changedstate.acquire()
1360
 
                    client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1361
 
                    client.changedstate.release()
1362
 
                    time2 = datetime.datetime.now()
1363
 
                    if (time2 - time) >= delay:
1364
 
                        if not client.approved_by_default:
1365
 
                            logger.warning("Client %s timed out while"
1366
 
                                           " waiting for approval",
1367
 
                                           client.name)
1368
 
                            if self.server.use_dbus:
1369
 
                                # Emit D-Bus signal
1370
 
                                client.Rejected("Approval timed out")
1371
 
                            return
1372
 
                        else:
1373
 
                            break
1374
 
                    else:
1375
 
                        delay -= time2 - time
1376
 
                
1377
 
                sent_size = 0
1378
 
                while sent_size < len(client.secret):
1379
 
                    try:
1380
 
                        sent = session.send(client.secret[sent_size:])
1381
 
                    except gnutls.errors.GNUTLSError as error:
1382
 
                        logger.warning("gnutls send failed")
1383
 
                        return
1384
 
                    logger.debug("Sent: %d, remaining: %d",
1385
 
                                 sent, len(client.secret)
1386
 
                                 - (sent_size + sent))
1387
 
                    sent_size += sent
1388
 
                
1389
 
                logger.info("Sending secret to %s", client.name)
1390
 
                # bump the timeout as if seen
1391
 
                client.checked_ok(client.extended_timeout)
1392
 
                if self.server.use_dbus:
1393
 
                    # Emit D-Bus signal
1394
 
                    client.GotSecret()
1395
 
            
1396
 
            finally:
1397
 
                if approval_required:
1398
 
                    client.approvals_pending -= 1
1399
 
                try:
1400
 
                    session.bye()
1401
 
                except gnutls.errors.GNUTLSError as error:
1402
 
                    logger.warning("GnuTLS bye failed")
1403
 
    
1404
 
    @staticmethod
1405
 
    def peer_certificate(session):
1406
 
        "Return the peer's OpenPGP certificate as a bytestring"
1407
 
        # If not an OpenPGP certificate...
1408
 
        if (gnutls.library.functions
1409
 
            .gnutls_certificate_type_get(session._c_object)
1410
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1411
 
            # ...do the normal thing
1412
 
            return session.peer_certificate
1413
 
        list_size = ctypes.c_uint(1)
1414
 
        cert_list = (gnutls.library.functions
1415
 
                     .gnutls_certificate_get_peers
1416
 
                     (session._c_object, ctypes.byref(list_size)))
1417
 
        if not bool(cert_list) and list_size.value != 0:
1418
 
            raise gnutls.errors.GNUTLSError("error getting peer"
1419
 
                                            " certificate")
1420
 
        if list_size.value == 0:
1421
 
            return None
1422
 
        cert = cert_list[0]
1423
 
        return ctypes.string_at(cert.data, cert.size)
1424
 
    
1425
 
    @staticmethod
1426
 
    def fingerprint(openpgp):
1427
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1428
 
        # New GnuTLS "datum" with the OpenPGP public key
1429
 
        datum = (gnutls.library.types
1430
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1431
 
                                             ctypes.POINTER
1432
 
                                             (ctypes.c_ubyte)),
1433
 
                                 ctypes.c_uint(len(openpgp))))
1434
 
        # New empty GnuTLS certificate
1435
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1436
 
        (gnutls.library.functions
1437
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1438
 
        # Import the OpenPGP public key into the certificate
1439
 
        (gnutls.library.functions
1440
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1441
 
                                    gnutls.library.constants
1442
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1443
 
        # Verify the self signature in the key
1444
 
        crtverify = ctypes.c_uint()
1445
 
        (gnutls.library.functions
1446
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1447
 
                                         ctypes.byref(crtverify)))
1448
 
        if crtverify.value != 0:
1449
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1450
 
            raise (gnutls.errors.CertificateSecurityError
1451
 
                   ("Verify failed"))
1452
 
        # New buffer for the fingerprint
1453
 
        buf = ctypes.create_string_buffer(20)
1454
 
        buf_len = ctypes.c_size_t()
1455
 
        # Get the fingerprint from the certificate into the buffer
1456
 
        (gnutls.library.functions
1457
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1458
 
                                             ctypes.byref(buf_len)))
1459
 
        # Deinit the certificate
1460
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1461
 
        # Convert the buffer to a Python bytestring
1462
 
        fpr = ctypes.string_at(buf, buf_len.value)
1463
 
        # Convert the bytestring to hexadecimal notation
1464
 
        hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
1465
 
        return hex_fpr
1466
 
 
1467
 
 
1468
 
class MultiprocessingMixIn(object):
1469
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1470
 
    def sub_process_main(self, request, address):
1471
 
        try:
1472
 
            self.finish_request(request, address)
1473
 
        except:
1474
 
            self.handle_error(request, address)
1475
 
        self.close_request(request)
1476
 
            
1477
 
    def process_request(self, request, address):
1478
 
        """Start a new process to process the request."""
1479
 
        multiprocessing.Process(target = self.sub_process_main,
1480
 
                                args = (request, address)).start()
1481
 
 
1482
 
 
1483
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1484
 
    """ adds a pipe to the MixIn """
1485
 
    def process_request(self, request, client_address):
1486
 
        """Overrides and wraps the original process_request().
1487
 
        
1488
 
        This function creates a new pipe in self.pipe
1489
 
        """
1490
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1491
 
        
1492
 
        super(MultiprocessingMixInWithPipe,
1493
 
              self).process_request(request, client_address)
1494
 
        self.child_pipe.close()
1495
 
        self.add_pipe(parent_pipe)
1496
 
    
1497
 
    def add_pipe(self, parent_pipe):
1498
 
        """Dummy function; override as necessary"""
1499
 
        raise NotImplementedError
1500
 
 
1501
 
 
1502
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1503
 
                     socketserver.TCPServer, object):
1504
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1505
 
    
 
434
        logger.debug(u"TCP connection from: %s",
 
435
                     unicode(self.client_address))
 
436
        session = gnutls.connection.ClientSession\
 
437
                  (self.request, gnutls.connection.X509Credentials())
 
438
        # Note: gnutls.connection.X509Credentials is really a generic
 
439
        # GnuTLS certificate credentials object so long as no X.509
 
440
        # keys are added to it.  Therefore, we can use it here despite
 
441
        # using OpenPGP certificates.
 
442
        
 
443
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
444
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
445
        #                "+DHE-DSS"))
 
446
        priority = "NORMAL"             # Fallback default, since this
 
447
                                        # MUST be set.
 
448
        if self.server.settings["priority"]:
 
449
            priority = self.server.settings["priority"]
 
450
        gnutls.library.functions.gnutls_priority_set_direct\
 
451
            (session._c_object, priority, None);
 
452
        
 
453
        try:
 
454
            session.handshake()
 
455
        except gnutls.errors.GNUTLSError, error:
 
456
            logger.debug(u"Handshake failed: %s", error)
 
457
            # Do not run session.bye() here: the session is not
 
458
            # established.  Just abandon the request.
 
459
            return
 
460
        try:
 
461
            fpr = fingerprint(peer_certificate(session))
 
462
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
463
            logger.debug(u"Bad certificate: %s", error)
 
464
            session.bye()
 
465
            return
 
466
        logger.debug(u"Fingerprint: %s", fpr)
 
467
        client = None
 
468
        for c in self.server.clients:
 
469
            if c.fingerprint == fpr:
 
470
                client = c
 
471
                break
 
472
        if not client:
 
473
            logger.debug(u"Client not found for fingerprint: %s", fpr)
 
474
            session.bye()
 
475
            return
 
476
        # Have to check if client.still_valid(), since it is possible
 
477
        # that the client timed out while establishing the GnuTLS
 
478
        # session.
 
479
        if not client.still_valid():
 
480
            logger.debug(u"Client %(name)s is invalid", vars(client))
 
481
            session.bye()
 
482
            return
 
483
        sent_size = 0
 
484
        while sent_size < len(client.secret):
 
485
            sent = session.send(client.secret[sent_size:])
 
486
            logger.debug(u"Sent: %d, remaining: %d",
 
487
                         sent, len(client.secret)
 
488
                         - (sent_size + sent))
 
489
            sent_size += sent
 
490
        session.bye()
 
491
 
 
492
 
 
493
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
494
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
1506
495
    Attributes:
1507
 
        enabled:        Boolean; whether this server is activated yet
1508
 
        interface:      None or a network interface name (string)
1509
 
        use_ipv6:       Boolean; to use IPv6 or not
 
496
        settings:       Server settings
 
497
        clients:        Set() of Client objects
1510
498
    """
1511
 
    def __init__(self, server_address, RequestHandlerClass,
1512
 
                 interface=None, use_ipv6=True):
1513
 
        self.interface = interface
1514
 
        if use_ipv6:
1515
 
            self.address_family = socket.AF_INET6
1516
 
        socketserver.TCPServer.__init__(self, server_address,
1517
 
                                        RequestHandlerClass)
 
499
    address_family = socket.AF_INET6
 
500
    def __init__(self, *args, **kwargs):
 
501
        if "settings" in kwargs:
 
502
            self.settings = kwargs["settings"]
 
503
            del kwargs["settings"]
 
504
        if "clients" in kwargs:
 
505
            self.clients = kwargs["clients"]
 
506
            del kwargs["clients"]
 
507
        return super(type(self), self).__init__(*args, **kwargs)
1518
508
    def server_bind(self):
1519
509
        """This overrides the normal server_bind() function
1520
510
        to bind to an interface if one was specified, and also NOT to
1521
511
        bind to an address or port if they were not specified."""
1522
 
        if self.interface is not None:
1523
 
            if SO_BINDTODEVICE is None:
1524
 
                logger.error("SO_BINDTODEVICE does not exist;"
1525
 
                             " cannot bind to interface %s",
1526
 
                             self.interface)
1527
 
            else:
1528
 
                try:
1529
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1530
 
                                           SO_BINDTODEVICE,
1531
 
                                           str(self.interface
1532
 
                                               + '\0'))
1533
 
                except socket.error as error:
1534
 
                    if error[0] == errno.EPERM:
1535
 
                        logger.error("No permission to"
1536
 
                                     " bind to interface %s",
1537
 
                                     self.interface)
1538
 
                    elif error[0] == errno.ENOPROTOOPT:
1539
 
                        logger.error("SO_BINDTODEVICE not available;"
1540
 
                                     " cannot bind to interface %s",
1541
 
                                     self.interface)
1542
 
                    else:
1543
 
                        raise
 
512
        if self.settings["interface"]:
 
513
            # 25 is from /usr/include/asm-i486/socket.h
 
514
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
515
            try:
 
516
                self.socket.setsockopt(socket.SOL_SOCKET,
 
517
                                       SO_BINDTODEVICE,
 
518
                                       self.settings["interface"])
 
519
            except socket.error, error:
 
520
                if error[0] == errno.EPERM:
 
521
                    logger.warning(u"No permission to"
 
522
                                   u" bind to interface %s",
 
523
                                   self.settings["interface"])
 
524
                else:
 
525
                    raise error
1544
526
        # Only bind(2) the socket if we really need to.
1545
527
        if self.server_address[0] or self.server_address[1]:
1546
528
            if not self.server_address[0]:
1547
 
                if self.address_family == socket.AF_INET6:
1548
 
                    any_address = "::" # in6addr_any
1549
 
                else:
1550
 
                    any_address = socket.INADDR_ANY
1551
 
                self.server_address = (any_address,
 
529
                in6addr_any = "::"
 
530
                self.server_address = (in6addr_any,
1552
531
                                       self.server_address[1])
1553
 
            elif not self.server_address[1]:
 
532
            elif self.server_address[1] is None:
1554
533
                self.server_address = (self.server_address[0],
1555
534
                                       0)
1556
 
#                 if self.interface:
1557
 
#                     self.server_address = (self.server_address[0],
1558
 
#                                            0, # port
1559
 
#                                            0, # flowinfo
1560
 
#                                            if_nametoindex
1561
 
#                                            (self.interface))
1562
 
            return socketserver.TCPServer.server_bind(self)
1563
 
 
1564
 
 
1565
 
class MandosServer(IPv6_TCPServer):
1566
 
    """Mandos server.
1567
 
    
1568
 
    Attributes:
1569
 
        clients:        set of Client objects
1570
 
        gnutls_priority GnuTLS priority string
1571
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1572
 
    
1573
 
    Assumes a gobject.MainLoop event loop.
1574
 
    """
1575
 
    def __init__(self, server_address, RequestHandlerClass,
1576
 
                 interface=None, use_ipv6=True, clients=None,
1577
 
                 gnutls_priority=None, use_dbus=True):
1578
 
        self.enabled = False
1579
 
        self.clients = clients
1580
 
        if self.clients is None:
1581
 
            self.clients = set()
1582
 
        self.use_dbus = use_dbus
1583
 
        self.gnutls_priority = gnutls_priority
1584
 
        IPv6_TCPServer.__init__(self, server_address,
1585
 
                                RequestHandlerClass,
1586
 
                                interface = interface,
1587
 
                                use_ipv6 = use_ipv6)
1588
 
    def server_activate(self):
1589
 
        if self.enabled:
1590
 
            return socketserver.TCPServer.server_activate(self)
1591
 
    def enable(self):
1592
 
        self.enabled = True
1593
 
    def add_pipe(self, parent_pipe):
1594
 
        # Call "handle_ipc" for both data and EOF events
1595
 
        gobject.io_add_watch(parent_pipe.fileno(),
1596
 
                             gobject.IO_IN | gobject.IO_HUP,
1597
 
                             functools.partial(self.handle_ipc,
1598
 
                                               parent_pipe = parent_pipe))
1599
 
        
1600
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1601
 
                   client_object=None):
1602
 
        condition_names = {
1603
 
            gobject.IO_IN: "IN",   # There is data to read.
1604
 
            gobject.IO_OUT: "OUT", # Data can be written (without
1605
 
                                    # blocking).
1606
 
            gobject.IO_PRI: "PRI", # There is urgent data to read.
1607
 
            gobject.IO_ERR: "ERR", # Error condition.
1608
 
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
1609
 
                                    # broken, usually for pipes and
1610
 
                                    # sockets).
1611
 
            }
1612
 
        conditions_string = ' | '.join(name
1613
 
                                       for cond, name in
1614
 
                                       condition_names.iteritems()
1615
 
                                       if cond & condition)
1616
 
        # error or the other end of multiprocessing.Pipe has closed
1617
 
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1618
 
            return False
1619
 
        
1620
 
        # Read a request from the child
1621
 
        request = parent_pipe.recv()
1622
 
        command = request[0]
1623
 
        
1624
 
        if command == 'init':
1625
 
            fpr = request[1]
1626
 
            address = request[2]
1627
 
            
1628
 
            for c in self.clients:
1629
 
                if c.fingerprint == fpr:
1630
 
                    client = c
1631
 
                    break
1632
 
            else:
1633
 
                logger.info("Client not found for fingerprint: %s, ad"
1634
 
                            "dress: %s", fpr, address)
1635
 
                if self.use_dbus:
1636
 
                    # Emit D-Bus signal
1637
 
                    mandos_dbus_service.ClientNotFound(fpr, address[0])
1638
 
                parent_pipe.send(False)
1639
 
                return False
1640
 
            
1641
 
            gobject.io_add_watch(parent_pipe.fileno(),
1642
 
                                 gobject.IO_IN | gobject.IO_HUP,
1643
 
                                 functools.partial(self.handle_ipc,
1644
 
                                                   parent_pipe = parent_pipe,
1645
 
                                                   client_object = client))
1646
 
            parent_pipe.send(True)
1647
 
            # remove the old hook in favor of the new above hook on same fileno
1648
 
            return False
1649
 
        if command == 'funcall':
1650
 
            funcname = request[1]
1651
 
            args = request[2]
1652
 
            kwargs = request[3]
1653
 
            
1654
 
            parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1655
 
        
1656
 
        if command == 'getattr':
1657
 
            attrname = request[1]
1658
 
            if callable(client_object.__getattribute__(attrname)):
1659
 
                parent_pipe.send(('function',))
1660
 
            else:
1661
 
                parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1662
 
        
1663
 
        if command == 'setattr':
1664
 
            attrname = request[1]
1665
 
            value = request[2]
1666
 
            setattr(client_object, attrname, value)
1667
 
        
1668
 
        return True
 
535
            return super(type(self), self).server_bind()
1669
536
 
1670
537
 
1671
538
def string_to_delta(interval):
1672
539
    """Parse a string and return a datetime.timedelta
1673
 
    
 
540
 
1674
541
    >>> string_to_delta('7d')
1675
542
    datetime.timedelta(7)
1676
543
    >>> string_to_delta('60s')
1679
546
    datetime.timedelta(0, 3600)
1680
547
    >>> string_to_delta('24h')
1681
548
    datetime.timedelta(1)
1682
 
    >>> string_to_delta('1w')
 
549
    >>> string_to_delta(u'1w')
1683
550
    datetime.timedelta(7)
1684
 
    >>> string_to_delta('5m 30s')
1685
 
    datetime.timedelta(0, 330)
1686
551
    """
1687
 
    timevalue = datetime.timedelta(0)
1688
 
    for s in interval.split():
1689
 
        try:
1690
 
            suffix = unicode(s[-1])
1691
 
            value = int(s[:-1])
1692
 
            if suffix == "d":
1693
 
                delta = datetime.timedelta(value)
1694
 
            elif suffix == "s":
1695
 
                delta = datetime.timedelta(0, value)
1696
 
            elif suffix == "m":
1697
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1698
 
            elif suffix == "h":
1699
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1700
 
            elif suffix == "w":
1701
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1702
 
            else:
1703
 
                raise ValueError("Unknown suffix %r" % suffix)
1704
 
        except (ValueError, IndexError) as e:
1705
 
            raise ValueError(*(e.args))
1706
 
        timevalue += delta
1707
 
    return timevalue
1708
 
 
1709
 
 
1710
 
def if_nametoindex(interface):
1711
 
    """Call the C function if_nametoindex(), or equivalent
 
552
    try:
 
553
        suffix=unicode(interval[-1])
 
554
        value=int(interval[:-1])
 
555
        if suffix == u"d":
 
556
            delta = datetime.timedelta(value)
 
557
        elif suffix == u"s":
 
558
            delta = datetime.timedelta(0, value)
 
559
        elif suffix == u"m":
 
560
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
561
        elif suffix == u"h":
 
562
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
563
        elif suffix == u"w":
 
564
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
565
        else:
 
566
            raise ValueError
 
567
    except (ValueError, IndexError):
 
568
        raise ValueError
 
569
    return delta
 
570
 
 
571
 
 
572
def server_state_changed(state):
 
573
    """Derived from the Avahi example code"""
 
574
    if state == avahi.SERVER_COLLISION:
 
575
        logger.warning(u"Server name collision")
 
576
        service.remove()
 
577
    elif state == avahi.SERVER_RUNNING:
 
578
        service.add()
 
579
 
 
580
 
 
581
def entry_group_state_changed(state, error):
 
582
    """Derived from the Avahi example code"""
 
583
    logger.debug(u"state change: %i", state)
1712
584
    
1713
 
    Note: This function cannot accept a unicode string."""
1714
 
    global if_nametoindex
 
585
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
586
        logger.debug(u"Service established.")
 
587
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
588
        logger.warning(u"Service name collision.")
 
589
        service.rename()
 
590
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
591
        logger.critical(u"Error in group state changed %s",
 
592
                        unicode(error))
 
593
        raise AvahiGroupError("State changed: %s", str(error))
 
594
 
 
595
def if_nametoindex(interface, _func=[None]):
 
596
    """Call the C function if_nametoindex(), or equivalent"""
 
597
    if _func[0] is not None:
 
598
        return _func[0](interface)
1715
599
    try:
1716
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1717
 
                          (ctypes.util.find_library("c"))
1718
 
                          .if_nametoindex)
 
600
        if "ctypes.util" not in sys.modules:
 
601
            import ctypes.util
 
602
        while True:
 
603
            try:
 
604
                libc = ctypes.cdll.LoadLibrary\
 
605
                       (ctypes.util.find_library("c"))
 
606
                _func[0] = libc.if_nametoindex
 
607
                return _func[0](interface)
 
608
            except IOError, e:
 
609
                if e != errno.EINTR:
 
610
                    raise
1719
611
    except (OSError, AttributeError):
1720
 
        logger.warning("Doing if_nametoindex the hard way")
1721
 
        def if_nametoindex(interface):
 
612
        if "struct" not in sys.modules:
 
613
            import struct
 
614
        if "fcntl" not in sys.modules:
 
615
            import fcntl
 
616
        def the_hard_way(interface):
1722
617
            "Get an interface index the hard way, i.e. using fcntl()"
1723
618
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
1724
 
            with contextlib.closing(socket.socket()) as s:
1725
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1726
 
                                    struct.pack(str("16s16x"),
1727
 
                                                interface))
1728
 
            interface_index = struct.unpack(str("I"),
1729
 
                                            ifreq[16:20])[0]
 
619
            s = socket.socket()
 
620
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
621
                                struct.pack("16s16x", interface))
 
622
            s.close()
 
623
            interface_index = struct.unpack("I", ifreq[16:20])[0]
1730
624
            return interface_index
1731
 
    return if_nametoindex(interface)
1732
 
 
1733
 
 
1734
 
def daemon(nochdir = False, noclose = False):
 
625
        _func[0] = the_hard_way
 
626
        return _func[0](interface)
 
627
 
 
628
 
 
629
def daemon(nochdir, noclose):
1735
630
    """See daemon(3).  Standard BSD Unix function.
1736
 
    
1737
631
    This should really exist as os.daemon, but it doesn't (yet)."""
1738
632
    if os.fork():
1739
633
        sys.exit()
1740
634
    os.setsid()
1741
635
    if not nochdir:
1742
636
        os.chdir("/")
1743
 
    if os.fork():
1744
 
        sys.exit()
1745
637
    if not noclose:
1746
638
        # Close all standard open file descriptors
1747
639
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1748
640
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1749
641
            raise OSError(errno.ENODEV,
1750
 
                          "%s not a character device"
1751
 
                          % os.path.devnull)
 
642
                          "/dev/null not a character device")
1752
643
        os.dup2(null, sys.stdin.fileno())
1753
644
        os.dup2(null, sys.stdout.fileno())
1754
645
        os.dup2(null, sys.stderr.fileno())
1757
648
 
1758
649
 
1759
650
def main():
1760
 
    
1761
 
    ##################################################################
1762
 
    # Parsing of options, both command line and config file
1763
 
    
1764
 
    parser = argparse.ArgumentParser()
1765
 
    parser.add_argument("-v", "--version", action="version",
1766
 
                        version = "%%(prog)s %s" % version,
1767
 
                        help="show version number and exit")
1768
 
    parser.add_argument("-i", "--interface", metavar="IF",
1769
 
                        help="Bind to interface IF")
1770
 
    parser.add_argument("-a", "--address",
1771
 
                        help="Address to listen for requests on")
1772
 
    parser.add_argument("-p", "--port", type=int,
1773
 
                        help="Port number to receive requests on")
1774
 
    parser.add_argument("--check", action="store_true",
1775
 
                        help="Run self-test")
1776
 
    parser.add_argument("--debug", action="store_true",
1777
 
                        help="Debug mode; run in foreground and log"
1778
 
                        " to terminal")
1779
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
1780
 
                        help="Debug level for stdout output")
1781
 
    parser.add_argument("--priority", help="GnuTLS"
1782
 
                        " priority string (see GnuTLS documentation)")
1783
 
    parser.add_argument("--servicename",
1784
 
                        metavar="NAME", help="Zeroconf service name")
1785
 
    parser.add_argument("--configdir",
1786
 
                        default="/etc/mandos", metavar="DIR",
1787
 
                        help="Directory to search for configuration"
1788
 
                        " files")
1789
 
    parser.add_argument("--no-dbus", action="store_false",
1790
 
                        dest="use_dbus", help="Do not provide D-Bus"
1791
 
                        " system bus interface")
1792
 
    parser.add_argument("--no-ipv6", action="store_false",
1793
 
                        dest="use_ipv6", help="Do not use IPv6")
1794
 
    options = parser.parse_args()
 
651
    global main_loop_started
 
652
    main_loop_started = False
 
653
    
 
654
    parser = OptionParser()
 
655
    parser.add_option("-i", "--interface", type="string",
 
656
                      metavar="IF", help="Bind to interface IF")
 
657
    parser.add_option("-a", "--address", type="string",
 
658
                      help="Address to listen for requests on")
 
659
    parser.add_option("-p", "--port", type="int",
 
660
                      help="Port number to receive requests on")
 
661
    parser.add_option("--check", action="store_true", default=False,
 
662
                      help="Run self-test")
 
663
    parser.add_option("--debug", action="store_true", default=False,
 
664
                      help="Debug mode; run in foreground and log to"
 
665
                      " terminal")
 
666
    parser.add_option("--priority", type="string", help="GnuTLS"
 
667
                      " priority string (see GnuTLS documentation)")
 
668
    parser.add_option("--servicename", type="string", metavar="NAME",
 
669
                      help="Zeroconf service name")
 
670
    parser.add_option("--configdir", type="string",
 
671
                      default="/etc/mandos", metavar="DIR",
 
672
                      help="Directory to search for configuration"
 
673
                      " files")
 
674
    (options, args) = parser.parse_args()
1795
675
    
1796
676
    if options.check:
1797
677
        import doctest
1806
686
                        "priority":
1807
687
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1808
688
                        "servicename": "Mandos",
1809
 
                        "use_dbus": "True",
1810
 
                        "use_ipv6": "True",
1811
 
                        "debuglevel": "",
1812
689
                        }
1813
690
    
1814
691
    # Parse config file for server-global settings
1815
 
    server_config = configparser.SafeConfigParser(server_defaults)
 
692
    server_config = ConfigParser.SafeConfigParser(server_defaults)
1816
693
    del server_defaults
1817
 
    server_config.read(os.path.join(options.configdir,
1818
 
                                    "mandos.conf"))
 
694
    server_config.read(os.path.join(options.configdir, "server.conf"))
 
695
    server_section = "server"
1819
696
    # Convert the SafeConfigParser object to a dict
1820
 
    server_settings = server_config.defaults()
1821
 
    # Use the appropriate methods on the non-string config options
1822
 
    for option in ("debug", "use_dbus", "use_ipv6"):
1823
 
        server_settings[option] = server_config.getboolean("DEFAULT",
1824
 
                                                           option)
1825
 
    if server_settings["port"]:
1826
 
        server_settings["port"] = server_config.getint("DEFAULT",
1827
 
                                                       "port")
 
697
    server_settings = dict(server_config.items(server_section))
 
698
    # Use getboolean on the boolean config option
 
699
    server_settings["debug"] = server_config.getboolean\
 
700
                               (server_section, "debug")
1828
701
    del server_config
1829
702
    
1830
703
    # Override the settings from the config file with command line
1831
704
    # options, if set.
1832
705
    for option in ("interface", "address", "port", "debug",
1833
 
                   "priority", "servicename", "configdir",
1834
 
                   "use_dbus", "use_ipv6", "debuglevel"):
 
706
                   "priority", "servicename", "configdir"):
1835
707
        value = getattr(options, option)
1836
708
        if value is not None:
1837
709
            server_settings[option] = value
1838
710
    del options
1839
 
    # Force all strings to be unicode
1840
 
    for option in server_settings.keys():
1841
 
        if type(server_settings[option]) is str:
1842
 
            server_settings[option] = unicode(server_settings[option])
1843
711
    # Now we have our good server settings in "server_settings"
1844
712
    
1845
 
    ##################################################################
1846
 
    
1847
 
    # For convenience
1848
 
    debug = server_settings["debug"]
1849
 
    debuglevel = server_settings["debuglevel"]
1850
 
    use_dbus = server_settings["use_dbus"]
1851
 
    use_ipv6 = server_settings["use_ipv6"]
1852
 
    
1853
 
    if server_settings["servicename"] != "Mandos":
1854
 
        syslogger.setFormatter(logging.Formatter
1855
 
                               ('Mandos (%s) [%%(process)d]:'
1856
 
                                ' %%(levelname)s: %%(message)s'
1857
 
                                % server_settings["servicename"]))
1858
 
    
1859
713
    # Parse config file with clients
1860
 
    client_defaults = { "timeout": "5m",
1861
 
                        "extended_timeout": "15m",
1862
 
                        "interval": "2m",
1863
 
                        "checker": "fping -q -- %%(host)s",
1864
 
                        "host": "",
1865
 
                        "approval_delay": "0s",
1866
 
                        "approval_duration": "1s",
 
714
    client_defaults = { "timeout": "1h",
 
715
                        "interval": "5m",
 
716
                        "checker": "fping -q -- %%(fqdn)s",
1867
717
                        }
1868
 
    client_config = configparser.SafeConfigParser(client_defaults)
 
718
    client_config = ConfigParser.SafeConfigParser(client_defaults)
1869
719
    client_config.read(os.path.join(server_settings["configdir"],
1870
720
                                    "clients.conf"))
1871
721
    
1872
 
    global mandos_dbus_service
1873
 
    mandos_dbus_service = None
1874
 
    
1875
 
    tcp_server = MandosServer((server_settings["address"],
1876
 
                               server_settings["port"]),
1877
 
                              ClientHandler,
1878
 
                              interface=(server_settings["interface"]
1879
 
                                         or None),
1880
 
                              use_ipv6=use_ipv6,
1881
 
                              gnutls_priority=
1882
 
                              server_settings["priority"],
1883
 
                              use_dbus=use_dbus)
1884
 
    if not debug:
1885
 
        pidfilename = "/var/run/mandos.pid"
1886
 
        try:
1887
 
            pidfile = open(pidfilename, "w")
1888
 
        except IOError:
1889
 
            logger.error("Could not open file %r", pidfilename)
1890
 
    
1891
 
    try:
1892
 
        uid = pwd.getpwnam("_mandos").pw_uid
1893
 
        gid = pwd.getpwnam("_mandos").pw_gid
1894
 
    except KeyError:
1895
 
        try:
1896
 
            uid = pwd.getpwnam("mandos").pw_uid
1897
 
            gid = pwd.getpwnam("mandos").pw_gid
1898
 
        except KeyError:
1899
 
            try:
1900
 
                uid = pwd.getpwnam("nobody").pw_uid
1901
 
                gid = pwd.getpwnam("nobody").pw_gid
1902
 
            except KeyError:
1903
 
                uid = 65534
1904
 
                gid = 65534
1905
 
    try:
1906
 
        os.setgid(gid)
1907
 
        os.setuid(uid)
1908
 
    except OSError as error:
1909
 
        if error[0] != errno.EPERM:
1910
 
            raise error
1911
 
    
1912
 
    if not debug and not debuglevel:
1913
 
        syslogger.setLevel(logging.WARNING)
1914
 
        console.setLevel(logging.WARNING)
1915
 
    if debuglevel:
1916
 
        level = getattr(logging, debuglevel.upper())
1917
 
        syslogger.setLevel(level)
1918
 
        console.setLevel(level)
1919
 
    
1920
 
    if debug:
1921
 
        # Enable all possible GnuTLS debugging
1922
 
        
1923
 
        # "Use a log level over 10 to enable all debugging options."
1924
 
        # - GnuTLS manual
1925
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1926
 
        
1927
 
        @gnutls.library.types.gnutls_log_func
1928
 
        def debug_gnutls(level, string):
1929
 
            logger.debug("GnuTLS: %s", string[:-1])
1930
 
        
1931
 
        (gnutls.library.functions
1932
 
         .gnutls_global_set_log_function(debug_gnutls))
1933
 
        
1934
 
        # Redirect stdin so all checkers get /dev/null
1935
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1936
 
        os.dup2(null, sys.stdin.fileno())
1937
 
        if null > 2:
1938
 
            os.close(null)
1939
 
    else:
1940
 
        # No console logging
1941
 
        logger.removeHandler(console)
1942
 
    
1943
 
    # Need to fork before connecting to D-Bus
1944
 
    if not debug:
1945
 
        # Close all input and output, do double fork, etc.
1946
 
        daemon()
 
722
    global service
 
723
    service = AvahiService(name = server_settings["servicename"],
 
724
                           type = "_mandos._tcp", );
 
725
    if server_settings["interface"]:
 
726
        service.interface = if_nametoindex(server_settings["interface"])
1947
727
    
1948
728
    global main_loop
 
729
    global bus
 
730
    global server
1949
731
    # From the Avahi example code
1950
732
    DBusGMainLoop(set_as_default=True )
1951
733
    main_loop = gobject.MainLoop()
1952
734
    bus = dbus.SystemBus()
 
735
    server = dbus.Interface(
 
736
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
737
            avahi.DBUS_INTERFACE_SERVER )
1953
738
    # End of Avahi example code
1954
 
    if use_dbus:
1955
 
        try:
1956
 
            bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",
1957
 
                                            bus, do_not_queue=True)
1958
 
            bus_name2 = dbus.service.BusName("se.recompile.Mandos",
1959
 
                                            bus, do_not_queue=True)
1960
 
        except dbus.exceptions.NameExistsException as e:
1961
 
            logger.error(unicode(e) + ", disabling D-Bus")
1962
 
            use_dbus = False
1963
 
            server_settings["use_dbus"] = False
1964
 
            tcp_server.use_dbus = False
1965
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1966
 
    service = AvahiService(name = server_settings["servicename"],
1967
 
                           servicetype = "_mandos._tcp",
1968
 
                           protocol = protocol, bus = bus)
1969
 
    if server_settings["interface"]:
1970
 
        service.interface = (if_nametoindex
1971
 
                             (str(server_settings["interface"])))
1972
 
    
1973
 
    global multiprocessing_manager
1974
 
    multiprocessing_manager = multiprocessing.Manager()
1975
 
    
1976
 
    client_class = Client
1977
 
    if use_dbus:
1978
 
        client_class = functools.partial(ClientDBus, bus = bus)
1979
 
    def client_config_items(config, section):
1980
 
        special_settings = {
1981
 
            "approved_by_default":
1982
 
                lambda: config.getboolean(section,
1983
 
                                          "approved_by_default"),
1984
 
            }
1985
 
        for name, value in config.items(section):
1986
 
            try:
1987
 
                yield (name, special_settings[name]())
1988
 
            except KeyError:
1989
 
                yield (name, value)
1990
 
    
1991
 
    tcp_server.clients.update(set(
1992
 
            client_class(name = section,
1993
 
                         config= dict(client_config_items(
1994
 
                        client_config, section)))
1995
 
            for section in client_config.sections()))
1996
 
    if not tcp_server.clients:
1997
 
        logger.warning("No clients defined")
1998
 
        
1999
 
    if not debug:
2000
 
        try:
2001
 
            with pidfile:
2002
 
                pid = os.getpid()
2003
 
                pidfile.write(str(pid) + "\n".encode("utf-8"))
2004
 
            del pidfile
2005
 
        except IOError:
2006
 
            logger.error("Could not write to file %r with PID %d",
2007
 
                         pidfilename, pid)
2008
 
        except NameError:
2009
 
            # "pidfile" was never created
2010
 
            pass
2011
 
        del pidfilename
2012
 
        
 
739
    
 
740
    debug = server_settings["debug"]
 
741
    
 
742
    if debug:
 
743
        console = logging.StreamHandler()
 
744
        # console.setLevel(logging.DEBUG)
 
745
        console.setFormatter(logging.Formatter\
 
746
                             ('%(levelname)s: %(message)s'))
 
747
        logger.addHandler(console)
 
748
        del console
 
749
    
 
750
    clients = Set()
 
751
    def remove_from_clients(client):
 
752
        clients.remove(client)
 
753
        if not clients:
 
754
            logger.debug(u"No clients left, exiting")
 
755
            sys.exit()
 
756
    
 
757
    clients.update(Set(Client(name=section,
 
758
                              stop_hook = remove_from_clients,
 
759
                              **(dict(client_config\
 
760
                                      .items(section))))
 
761
                       for section in client_config.sections()))
 
762
    
 
763
    if not debug:
 
764
        daemon(False, False)
 
765
    
 
766
    def cleanup():
 
767
        "Cleanup function; run on exit"
 
768
        global group
 
769
        # From the Avahi example code
 
770
        if not group is None:
 
771
            group.Free()
 
772
            group = None
 
773
        # End of Avahi example code
 
774
        
 
775
        while clients:
 
776
            client = clients.pop()
 
777
            client.stop_hook = None
 
778
            client.stop()
 
779
    
 
780
    atexit.register(cleanup)
 
781
    
 
782
    if not debug:
2013
783
        signal.signal(signal.SIGINT, signal.SIG_IGN)
2014
 
    
2015
784
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
2016
785
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
2017
786
    
2018
 
    if use_dbus:
2019
 
        class MandosDBusService(dbus.service.Object):
2020
 
            """A D-Bus proxy object"""
2021
 
            def __init__(self):
2022
 
                dbus.service.Object.__init__(self, bus, "/")
2023
 
            _interface = "se.bsnet.fukt.Mandos"
2024
 
            
2025
 
            @dbus.service.signal(_interface, signature="o")
2026
 
            def ClientAdded(self, objpath):
2027
 
                "D-Bus signal"
2028
 
                pass
2029
 
            
2030
 
            @dbus.service.signal(_interface, signature="ss")
2031
 
            def ClientNotFound(self, fingerprint, address):
2032
 
                "D-Bus signal"
2033
 
                pass
2034
 
            
2035
 
            @dbus.service.signal(_interface, signature="os")
2036
 
            def ClientRemoved(self, objpath, name):
2037
 
                "D-Bus signal"
2038
 
                pass
2039
 
            
2040
 
            @dbus.service.method(_interface, out_signature="ao")
2041
 
            def GetAllClients(self):
2042
 
                "D-Bus method"
2043
 
                return dbus.Array(c.dbus_object_path
2044
 
                                  for c in tcp_server.clients)
2045
 
            
2046
 
            @dbus.service.method(_interface,
2047
 
                                 out_signature="a{oa{sv}}")
2048
 
            def GetAllClientsWithProperties(self):
2049
 
                "D-Bus method"
2050
 
                return dbus.Dictionary(
2051
 
                    ((c.dbus_object_path, c.GetAll(""))
2052
 
                     for c in tcp_server.clients),
2053
 
                    signature="oa{sv}")
2054
 
            
2055
 
            @dbus.service.method(_interface, in_signature="o")
2056
 
            def RemoveClient(self, object_path):
2057
 
                "D-Bus method"
2058
 
                for c in tcp_server.clients:
2059
 
                    if c.dbus_object_path == object_path:
2060
 
                        tcp_server.clients.remove(c)
2061
 
                        c.remove_from_connection()
2062
 
                        # Don't signal anything except ClientRemoved
2063
 
                        c.disable(quiet=True)
2064
 
                        # Emit D-Bus signal
2065
 
                        self.ClientRemoved(object_path, c.name)
2066
 
                        return
2067
 
                raise KeyError(object_path)
2068
 
            
2069
 
            del _interface
2070
 
        
2071
 
        mandos_dbus_service = MandosDBusService()
2072
 
    
2073
 
    def cleanup():
2074
 
        "Cleanup function; run on exit"
2075
 
        service.cleanup()
2076
 
        
2077
 
        while tcp_server.clients:
2078
 
            client = tcp_server.clients.pop()
2079
 
            if use_dbus:
2080
 
                client.remove_from_connection()
2081
 
            client.disable_hook = None
2082
 
            # Don't signal anything except ClientRemoved
2083
 
            client.disable(quiet=True)
2084
 
            if use_dbus:
2085
 
                # Emit D-Bus signal
2086
 
                mandos_dbus_service.ClientRemoved(client.dbus_object_path,
2087
 
                                                  client.name)
2088
 
    
2089
 
    atexit.register(cleanup)
2090
 
    
2091
 
    for client in tcp_server.clients:
2092
 
        if use_dbus:
2093
 
            # Emit D-Bus signal
2094
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
2095
 
        client.enable()
2096
 
    
2097
 
    tcp_server.enable()
2098
 
    tcp_server.server_activate()
2099
 
    
 
787
    for client in clients:
 
788
        client.start()
 
789
    
 
790
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
791
                                 server_settings["port"]),
 
792
                                tcp_handler,
 
793
                                settings=server_settings,
 
794
                                clients=clients)
2100
795
    # Find out what port we got
2101
796
    service.port = tcp_server.socket.getsockname()[1]
2102
 
    if use_ipv6:
2103
 
        logger.info("Now listening on address %r, port %d,"
2104
 
                    " flowinfo %d, scope_id %d"
2105
 
                    % tcp_server.socket.getsockname())
2106
 
    else:                       # IPv4
2107
 
        logger.info("Now listening on address %r, port %d"
2108
 
                    % tcp_server.socket.getsockname())
 
797
    logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
 
798
                 u" scope_id %d" % tcp_server.socket.getsockname())
2109
799
    
2110
800
    #service.interface = tcp_server.socket.getsockname()[3]
2111
801
    
2112
802
    try:
2113
803
        # From the Avahi example code
 
804
        server.connect_to_signal("StateChanged", server_state_changed)
2114
805
        try:
2115
 
            service.activate()
2116
 
        except dbus.exceptions.DBusException as error:
2117
 
            logger.critical("DBusException: %s", error)
2118
 
            cleanup()
 
806
            server_state_changed(server.GetState())
 
807
        except dbus.exceptions.DBusException, error:
 
808
            logger.critical(u"DBusException: %s", error)
2119
809
            sys.exit(1)
2120
810
        # End of Avahi example code
2121
811
        
2122
812
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2123
813
                             lambda *args, **kwargs:
2124
 
                             (tcp_server.handle_request
2125
 
                              (*args[2:], **kwargs) or True))
 
814
                             tcp_server.handle_request\
 
815
                             (*args[2:], **kwargs) or True)
2126
816
        
2127
817
        logger.debug("Starting main loop")
 
818
        main_loop_started = True
2128
819
        main_loop.run()
2129
 
    except AvahiError as error:
2130
 
        logger.critical("AvahiError: %s", error)
2131
 
        cleanup()
 
820
    except AvahiError, error:
 
821
        logger.critical(u"AvahiError: %s" + unicode(error))
2132
822
        sys.exit(1)
2133
823
    except KeyboardInterrupt:
2134
824
        if debug:
2135
 
            print("", file=sys.stderr)
2136
 
        logger.debug("Server received KeyboardInterrupt")
2137
 
    logger.debug("Server exiting")
2138
 
    # Must run before the D-Bus bus name gets deregistered
2139
 
    cleanup()
2140
 
 
 
825
            print
2141
826
 
2142
827
if __name__ == '__main__':
2143
828
    main()