/mandos/release

To get this branch, use:
bzr branch http://bzr.recompile.se/loggerhead/mandos/release

« back to all changes in this revision

Viewing changes to server.py

  • Committer: Teddy Hogeborn
  • Date: 2008-07-21 23:18:02 UTC
  • mfrom: (15.1.5 mandos) (15.1.5 mandos)
  • Revision ID: teddy@fukt.bsnet.se-20080721231802-0emzdsxkfy457p9u
merge

Show diffs side-by-side

added added

removed removed

Lines of Context:
6
6
# 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" and "remove" in the "AvahiService" class, the
10
 
# "server_state_changed" and "entry_group_state_changed" functions,
11
 
# and some lines in "main".
 
9
# following functions: "add_service", "remove_service",
 
10
# "server_state_changed", "entry_group_state_changed", and some lines
 
11
# in "main".
12
12
13
 
# Everything else is
14
 
# Copyright © 2008,2009 Teddy Hogeborn
15
 
# Copyright © 2008,2009 Björn Påhlsson
 
13
# Everything else is Copyright © 2007-2008 Teddy Hogeborn and Björn
 
14
# 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/>.
30
 
31
 
# Contact the authors at <mandos@fukt.bsnet.se>.
32
 
33
 
 
34
 
from __future__ import division, with_statement, absolute_import
35
 
 
36
 
import SocketServer as socketserver
 
27
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
28
 
29
# Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
 
30
# <https://www.fukt.bsnet.se/~teddy/>.
 
31
 
32
 
 
33
from __future__ import division
 
34
 
 
35
import SocketServer
37
36
import socket
38
 
import optparse
 
37
import select
 
38
from optparse import OptionParser
39
39
import datetime
40
40
import errno
41
41
import gnutls.crypto
44
44
import gnutls.library.functions
45
45
import gnutls.library.constants
46
46
import gnutls.library.types
47
 
import ConfigParser as configparser
 
47
import ConfigParser
48
48
import sys
49
49
import re
50
50
import os
51
51
import signal
 
52
from sets import Set
52
53
import subprocess
53
54
import atexit
54
55
import stat
55
56
import logging
56
57
import logging.handlers
57
 
import pwd
58
 
from contextlib import closing
59
 
import struct
60
 
import fcntl
61
58
 
62
59
import dbus
63
 
import dbus.service
64
60
import gobject
65
61
import avahi
66
62
from dbus.mainloop.glib import DBusGMainLoop
67
63
import ctypes
68
 
import ctypes.util
69
 
 
70
 
try:
71
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
72
 
except AttributeError:
73
 
    try:
74
 
        from IN import SO_BINDTODEVICE
75
 
    except ImportError:
76
 
        # From /usr/include/asm/socket.h
77
 
        SO_BINDTODEVICE = 25
78
 
 
79
 
 
80
 
version = "1.0.8"
81
 
 
82
 
logger = logging.Logger(u'mandos')
83
 
syslogger = (logging.handlers.SysLogHandler
84
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
85
 
              address = "/dev/log"))
86
 
syslogger.setFormatter(logging.Formatter
87
 
                       (u'Mandos [%(process)d]: %(levelname)s:'
88
 
                        u' %(message)s'))
 
64
 
 
65
# Brief description of the operation of this program:
 
66
 
67
# This server announces itself as a Zeroconf service.  Connecting
 
68
# clients use the TLS protocol, with the unusual quirk that this
 
69
# server program acts as a TLS "client" while the connecting clients
 
70
# acts as a TLS "server".  The clients (acting as a TLS "server") must
 
71
# supply an OpenPGP certificate, and the fingerprint of this
 
72
# certificate is used by this server to look up (in a list read from a
 
73
# file at start time) which binary blob to give the client.  No other
 
74
# authentication or authorization is done by this server.
 
75
 
 
76
 
 
77
logger = logging.Logger('mandos')
 
78
syslogger = logging.handlers.SysLogHandler\
 
79
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
 
80
syslogger.setFormatter(logging.Formatter\
 
81
                        ('%(levelname)s: %(message)s'))
89
82
logger.addHandler(syslogger)
90
 
 
91
 
console = logging.StreamHandler()
92
 
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
93
 
                                       u' %(levelname)s:'
94
 
                                       u' %(message)s'))
95
 
logger.addHandler(console)
96
 
 
97
 
class AvahiError(Exception):
98
 
    def __init__(self, value, *args, **kwargs):
99
 
        self.value = value
100
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
101
 
    def __unicode__(self):
102
 
        return unicode(repr(self.value))
103
 
 
104
 
class AvahiServiceError(AvahiError):
105
 
    pass
106
 
 
107
 
class AvahiGroupError(AvahiError):
108
 
    pass
109
 
 
110
 
 
111
 
class AvahiService(object):
112
 
    """An Avahi (Zeroconf) service.
113
 
    
114
 
    Attributes:
115
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
116
 
               Used to optionally bind to the specified interface.
117
 
    name: string; Example: u'Mandos'
118
 
    type: string; Example: u'_mandos._tcp'.
119
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
120
 
    port: integer; what port to announce
121
 
    TXT: list of strings; TXT record for the service
122
 
    domain: string; Domain to publish on, default to .local if empty.
123
 
    host: string; Host to publish records for, default is localhost
124
 
    max_renames: integer; maximum number of renames
125
 
    rename_count: integer; counter so we only rename after collisions
126
 
                  a sensible number of times
127
 
    """
128
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
129
 
                 servicetype = None, port = None, TXT = None,
130
 
                 domain = u"", host = u"", max_renames = 32768,
131
 
                 protocol = avahi.PROTO_UNSPEC):
132
 
        self.interface = interface
133
 
        self.name = name
134
 
        self.type = servicetype
135
 
        self.port = port
136
 
        self.TXT = TXT if TXT is not None else []
137
 
        self.domain = domain
138
 
        self.host = host
139
 
        self.rename_count = 0
140
 
        self.max_renames = max_renames
141
 
        self.protocol = protocol
142
 
    def rename(self):
143
 
        """Derived from the Avahi example code"""
144
 
        if self.rename_count >= self.max_renames:
145
 
            logger.critical(u"No suitable Zeroconf service name found"
146
 
                            u" after %i retries, exiting.",
147
 
                            self.rename_count)
148
 
            raise AvahiServiceError(u"Too many renames")
149
 
        self.name = server.GetAlternativeServiceName(self.name)
150
 
        logger.info(u"Changing Zeroconf service name to %r ...",
151
 
                    self.name)
152
 
        syslogger.setFormatter(logging.Formatter
153
 
                               (u'Mandos (%s) [%%(process)d]:'
154
 
                                u' %%(levelname)s: %%(message)s'
155
 
                                % self.name))
156
 
        self.remove()
157
 
        self.add()
158
 
        self.rename_count += 1
159
 
    def remove(self):
160
 
        """Derived from the Avahi example code"""
161
 
        if group is not None:
162
 
            group.Reset()
163
 
    def add(self):
164
 
        """Derived from the Avahi example code"""
165
 
        global group
166
 
        if group is None:
167
 
            group = dbus.Interface(bus.get_object
168
 
                                   (avahi.DBUS_NAME,
169
 
                                    server.EntryGroupNew()),
170
 
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
171
 
            group.connect_to_signal('StateChanged',
172
 
                                    entry_group_state_changed)
173
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
174
 
                     service.name, service.type)
175
 
        group.AddService(
176
 
                self.interface,         # interface
177
 
                self.protocol,          # protocol
178
 
                dbus.UInt32(0),         # flags
179
 
                self.name, self.type,
180
 
                self.domain, self.host,
181
 
                dbus.UInt16(self.port),
182
 
                avahi.string_array_to_txt_array(self.TXT))
183
 
        group.Commit()
184
 
 
 
83
del syslogger
 
84
 
 
85
# This variable is used to optionally bind to a specified interface.
 
86
# It is a global variable to fit in with the other variables from the
 
87
# Avahi example code.
 
88
serviceInterface = avahi.IF_UNSPEC
185
89
# From the Avahi example code:
186
 
group = None                            # our entry group
 
90
serviceName = "Mandos"
 
91
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
92
servicePort = None                      # Not known at startup
 
93
serviceTXT = []                         # TXT record for the service
 
94
domain = ""                  # Domain to publish on, default to .local
 
95
host = ""          # Host to publish records for, default to localhost
 
96
group = None #our entry group
 
97
rename_count = 12       # Counter so we only rename after collisions a
 
98
                        # sensible number of times
187
99
# End of Avahi example code
188
100
 
189
101
 
190
 
def _datetime_to_dbus(dt, variant_level=0):
191
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
192
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
193
 
 
194
 
 
195
102
class Client(object):
196
103
    """A representation of a client host served by this server.
197
 
    
198
104
    Attributes:
199
 
    name:       string; from the config file, used in log messages and
200
 
                        D-Bus identifiers
 
105
    name:      string; from the config file, used in log messages
201
106
    fingerprint: string (40 or 32 hexadecimal digits); used to
202
107
                 uniquely identify the client
203
 
    secret:     bytestring; sent verbatim (over TLS) to client
204
 
    host:       string; available for use by the checker command
205
 
    created:    datetime.datetime(); (UTC) object creation
206
 
    last_enabled: datetime.datetime(); (UTC)
207
 
    enabled:    bool()
208
 
    last_checked_ok: datetime.datetime(); (UTC) or None
209
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
210
 
                                      until this client is invalid
211
 
    interval:   datetime.timedelta(); How often to start a new checker
212
 
    disable_hook:  If set, called by disable() as disable_hook(self)
213
 
    checker:    subprocess.Popen(); a running checker process used
214
 
                                    to see if the client lives.
215
 
                                    'None' if no process is running.
 
108
    secret:    bytestring; sent verbatim (over TLS) to client
 
109
    fqdn:      string (FQDN); available for use by the checker command
 
110
    created:   datetime.datetime()
 
111
    last_seen: datetime.datetime() or None if not yet seen
 
112
    timeout:   datetime.timedelta(); How long from last_seen until
 
113
                                     this client is invalid
 
114
    interval:  datetime.timedelta(); How often to start a new checker
 
115
    stop_hook: If set, called by stop() as stop_hook(self)
 
116
    checker:   subprocess.Popen(); a running checker process used
 
117
                                   to see if the client lives.
 
118
                                   Is None if no process is running.
216
119
    checker_initiator_tag: a gobject event source tag, or None
217
 
    disable_initiator_tag:    - '' -
 
120
    stop_initiator_tag:    - '' -
218
121
    checker_callback_tag:  - '' -
219
122
    checker_command: string; External command which is run to check if
220
 
                     client lives.  %() expansions are done at
 
123
                     client lives.  %()s expansions are done at
221
124
                     runtime with vars(self) as dict, so that for
222
125
                     instance %(name)s can be used in the command.
223
 
    current_checker_command: string; current running checker_command
 
126
    Private attibutes:
 
127
    _timeout: Real variable for 'timeout'
 
128
    _interval: Real variable for 'interval'
 
129
    _timeout_milliseconds: Used by gobject.timeout_add()
 
130
    _interval_milliseconds: - '' -
224
131
    """
225
 
    
226
 
    @staticmethod
227
 
    def _datetime_to_milliseconds(dt):
228
 
        "Convert a datetime.datetime() to milliseconds"
229
 
        return ((dt.days * 24 * 60 * 60 * 1000)
230
 
                + (dt.seconds * 1000)
231
 
                + (dt.microseconds // 1000))
232
 
    
233
 
    def timeout_milliseconds(self):
234
 
        "Return the 'timeout' attribute in milliseconds"
235
 
        return self._datetime_to_milliseconds(self.timeout)
236
 
    
237
 
    def interval_milliseconds(self):
238
 
        "Return the 'interval' attribute in milliseconds"
239
 
        return self._datetime_to_milliseconds(self.interval)
240
 
    
241
 
    def __init__(self, name = None, disable_hook=None, config=None):
242
 
        """Note: the 'checker' key in 'config' sets the
243
 
        'checker_command' attribute and *not* the 'checker'
244
 
        attribute."""
 
132
    def _set_timeout(self, timeout):
 
133
        "Setter function for 'timeout' attribute"
 
134
        self._timeout = timeout
 
135
        self._timeout_milliseconds = ((self.timeout.days
 
136
                                       * 24 * 60 * 60 * 1000)
 
137
                                      + (self.timeout.seconds * 1000)
 
138
                                      + (self.timeout.microseconds
 
139
                                         // 1000))
 
140
    timeout = property(lambda self: self._timeout,
 
141
                       _set_timeout)
 
142
    del _set_timeout
 
143
    def _set_interval(self, interval):
 
144
        "Setter function for 'interval' attribute"
 
145
        self._interval = interval
 
146
        self._interval_milliseconds = ((self.interval.days
 
147
                                        * 24 * 60 * 60 * 1000)
 
148
                                       + (self.interval.seconds
 
149
                                          * 1000)
 
150
                                       + (self.interval.microseconds
 
151
                                          // 1000))
 
152
    interval = property(lambda self: self._interval,
 
153
                        _set_interval)
 
154
    del _set_interval
 
155
    def __init__(self, name=None, options=None, stop_hook=None,
 
156
                 fingerprint=None, secret=None, secfile=None,
 
157
                 fqdn=None, timeout=None, interval=-1, checker=None):
 
158
        """Note: the 'checker' argument sets the 'checker_command'
 
159
        attribute and not the 'checker' attribute.."""
245
160
        self.name = name
246
 
        if config is None:
247
 
            config = {}
248
 
        logger.debug(u"Creating client %r", self.name)
249
 
        # Uppercase and remove spaces from fingerprint for later
250
 
        # comparison purposes with return value from the fingerprint()
251
 
        # function
252
 
        self.fingerprint = (config[u"fingerprint"].upper()
253
 
                            .replace(u" ", u""))
254
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
255
 
        if u"secret" in config:
256
 
            self.secret = config[u"secret"].decode(u"base64")
257
 
        elif u"secfile" in config:
258
 
            with closing(open(os.path.expanduser
259
 
                              (os.path.expandvars
260
 
                               (config[u"secfile"])))) as secfile:
261
 
                self.secret = secfile.read()
262
 
        else:
263
 
            raise TypeError(u"No secret or secfile for client %s"
264
 
                            % self.name)
265
 
        self.host = config.get(u"host", u"")
266
 
        self.created = datetime.datetime.utcnow()
267
 
        self.enabled = False
268
 
        self.last_enabled = None
269
 
        self.last_checked_ok = None
270
 
        self.timeout = string_to_delta(config[u"timeout"])
271
 
        self.interval = string_to_delta(config[u"interval"])
272
 
        self.disable_hook = disable_hook
 
161
        # Uppercase and remove spaces from fingerprint
 
162
        # for later comparison purposes with return value of
 
163
        # the fingerprint() function
 
164
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
165
        if secret:
 
166
            self.secret = secret.decode(u"base64")
 
167
        elif secfile:
 
168
            sf = open(secfile)
 
169
            self.secret = sf.read()
 
170
            sf.close()
 
171
        else:
 
172
            raise RuntimeError(u"No secret or secfile for client %s"
 
173
                               % self.name)
 
174
        self.fqdn = fqdn                # string
 
175
        self.created = datetime.datetime.now()
 
176
        self.last_seen = None
 
177
        if timeout is None:
 
178
            self.timeout = options.timeout
 
179
        else:
 
180
            self.timeout = string_to_delta(timeout)
 
181
        if interval == -1:
 
182
            self.interval = options.interval
 
183
        else:
 
184
            self.interval = string_to_delta(interval)
 
185
        self.stop_hook = stop_hook
273
186
        self.checker = None
274
187
        self.checker_initiator_tag = None
275
 
        self.disable_initiator_tag = None
 
188
        self.stop_initiator_tag = None
276
189
        self.checker_callback_tag = None
277
 
        self.checker_command = config[u"checker"]
278
 
        self.current_checker_command = None
279
 
        self.last_connect = None
280
 
    
281
 
    def enable(self):
 
190
        self.check_command = checker
 
191
    def start(self):
282
192
        """Start this client's checker and timeout hooks"""
283
 
        self.last_enabled = datetime.datetime.utcnow()
284
193
        # Schedule a new checker to be started an 'interval' from now,
285
194
        # and every interval from then on.
286
 
        self.checker_initiator_tag = (gobject.timeout_add
287
 
                                      (self.interval_milliseconds(),
288
 
                                       self.start_checker))
 
195
        self.checker_initiator_tag = gobject.timeout_add\
 
196
                                     (self._interval_milliseconds,
 
197
                                      self.start_checker)
289
198
        # Also start a new checker *right now*.
290
199
        self.start_checker()
291
 
        # Schedule a disable() when 'timeout' has passed
292
 
        self.disable_initiator_tag = (gobject.timeout_add
293
 
                                   (self.timeout_milliseconds(),
294
 
                                    self.disable))
295
 
        self.enabled = True
296
 
    
297
 
    def disable(self):
298
 
        """Disable this client."""
299
 
        if not getattr(self, "enabled", False):
 
200
        # Schedule a stop() when 'timeout' has passed
 
201
        self.stop_initiator_tag = gobject.timeout_add\
 
202
                                  (self._timeout_milliseconds,
 
203
                                   self.stop)
 
204
    def stop(self):
 
205
        """Stop this client.
 
206
        The possibility that this client might be restarted is left
 
207
        open, but not currently used."""
 
208
        # If this client doesn't have a secret, it is already stopped.
 
209
        if self.secret:
 
210
            logger.debug(u"Stopping client %s", self.name)
 
211
            self.secret = None
 
212
        else:
300
213
            return False
301
 
        logger.info(u"Disabling client %s", self.name)
302
 
        if getattr(self, u"disable_initiator_tag", False):
303
 
            gobject.source_remove(self.disable_initiator_tag)
304
 
            self.disable_initiator_tag = None
305
 
        if getattr(self, u"checker_initiator_tag", False):
 
214
        if hasattr(self, "stop_initiator_tag") \
 
215
               and self.stop_initiator_tag:
 
216
            gobject.source_remove(self.stop_initiator_tag)
 
217
            self.stop_initiator_tag = None
 
218
        if hasattr(self, "checker_initiator_tag") \
 
219
               and self.checker_initiator_tag:
306
220
            gobject.source_remove(self.checker_initiator_tag)
307
221
            self.checker_initiator_tag = None
308
222
        self.stop_checker()
309
 
        if self.disable_hook:
310
 
            self.disable_hook(self)
311
 
        self.enabled = False
 
223
        if self.stop_hook:
 
224
            self.stop_hook(self)
312
225
        # Do not run this again if called by a gobject.timeout_add
313
226
        return False
314
 
    
315
227
    def __del__(self):
316
 
        self.disable_hook = None
317
 
        self.disable()
318
 
    
319
 
    def checker_callback(self, pid, condition, command):
 
228
        self.stop_hook = None
 
229
        self.stop()
 
230
    def checker_callback(self, pid, condition):
320
231
        """The checker has completed, so take appropriate actions."""
 
232
        now = datetime.datetime.now()
321
233
        self.checker_callback_tag = None
322
234
        self.checker = None
323
 
        if os.WIFEXITED(condition):
324
 
            exitstatus = os.WEXITSTATUS(condition)
325
 
            if exitstatus == 0:
326
 
                logger.info(u"Checker for %(name)s succeeded",
327
 
                            vars(self))
328
 
                self.checked_ok()
329
 
            else:
330
 
                logger.info(u"Checker for %(name)s failed",
331
 
                            vars(self))
332
 
        else:
 
235
        if os.WIFEXITED(condition) \
 
236
               and (os.WEXITSTATUS(condition) == 0):
 
237
            logger.debug(u"Checker for %(name)s succeeded",
 
238
                         vars(self))
 
239
            self.last_seen = now
 
240
            gobject.source_remove(self.stop_initiator_tag)
 
241
            self.stop_initiator_tag = gobject.timeout_add\
 
242
                                      (self._timeout_milliseconds,
 
243
                                       self.stop)
 
244
        elif not os.WIFEXITED(condition):
333
245
            logger.warning(u"Checker for %(name)s crashed?",
334
246
                           vars(self))
335
 
    
336
 
    def checked_ok(self):
337
 
        """Bump up the timeout for this client.
338
 
        
339
 
        This should only be called when the client has been seen,
340
 
        alive and well.
341
 
        """
342
 
        self.last_checked_ok = datetime.datetime.utcnow()
343
 
        gobject.source_remove(self.disable_initiator_tag)
344
 
        self.disable_initiator_tag = (gobject.timeout_add
345
 
                                      (self.timeout_milliseconds(),
346
 
                                       self.disable))
347
 
    
 
247
        else:
 
248
            logger.debug(u"Checker for %(name)s failed",
 
249
                         vars(self))
348
250
    def start_checker(self):
349
251
        """Start a new checker subprocess if one is not running.
350
 
        
351
252
        If a checker already exists, leave it running and do
352
253
        nothing."""
353
254
        # The reason for not killing a running checker is that if we
358
259
        # checkers alone, the checker would have to take more time
359
260
        # than 'timeout' for the client to be declared invalid, which
360
261
        # is as it should be.
361
 
        
362
 
        # If a checker exists, make sure it is not a zombie
363
 
        if self.checker is not None:
364
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
365
 
            if pid:
366
 
                logger.warning(u"Checker was a zombie")
367
 
                gobject.source_remove(self.checker_callback_tag)
368
 
                self.checker_callback(pid, status,
369
 
                                      self.current_checker_command)
370
 
        # Start a new checker if needed
371
262
        if self.checker is None:
372
263
            try:
373
 
                # In case checker_command has exactly one % operator
374
 
                command = self.checker_command % self.host
 
264
                command = self.check_command % self.fqdn
375
265
            except TypeError:
376
 
                # Escape attributes for the shell
377
 
                escaped_attrs = dict((key,
378
 
                                      re.escape(unicode(str(val),
379
 
                                                        errors=
380
 
                                                        u'replace')))
 
266
                escaped_attrs = dict((key, re.escape(str(val)))
381
267
                                     for key, val in
382
268
                                     vars(self).iteritems())
383
269
                try:
384
 
                    command = self.checker_command % escaped_attrs
 
270
                    command = self.check_command % escaped_attrs
385
271
                except TypeError, error:
386
 
                    logger.error(u'Could not format string "%s":'
387
 
                                 u' %s', self.checker_command, error)
 
272
                    logger.critical(u'Could not format string "%s":'
 
273
                                    u' %s', self.check_command, error)
388
274
                    return True # Try again later
389
 
            self.current_checker_command = command
390
275
            try:
391
 
                logger.info(u"Starting checker %r for %s",
392
 
                            command, self.name)
393
 
                # We don't need to redirect stdout and stderr, since
394
 
                # in normal mode, that is already done by daemon(),
395
 
                # and in debug mode we don't want to.  (Stdin is
396
 
                # always replaced by /dev/null.)
397
 
                self.checker = subprocess.Popen(command,
398
 
                                                close_fds=True,
399
 
                                                shell=True, cwd=u"/")
400
 
                self.checker_callback_tag = (gobject.child_watch_add
401
 
                                             (self.checker.pid,
402
 
                                              self.checker_callback,
403
 
                                              data=command))
404
 
                # The checker may have completed before the gobject
405
 
                # watch was added.  Check for this.
406
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
407
 
                if pid:
408
 
                    gobject.source_remove(self.checker_callback_tag)
409
 
                    self.checker_callback(pid, status, command)
410
 
            except OSError, error:
 
276
                logger.debug(u"Starting checker %r for %s",
 
277
                             command, self.name)
 
278
                self.checker = subprocess.\
 
279
                               Popen(command,
 
280
                                     close_fds=True, shell=True,
 
281
                                     cwd="/")
 
282
                self.checker_callback_tag = gobject.child_watch_add\
 
283
                                            (self.checker.pid,
 
284
                                             self.checker_callback)
 
285
            except subprocess.OSError, error:
411
286
                logger.error(u"Failed to start subprocess: %s",
412
287
                             error)
413
288
        # Re-run this periodically if run by gobject.timeout_add
414
289
        return True
415
 
    
416
290
    def stop_checker(self):
417
291
        """Force the checker process, if any, to stop."""
418
292
        if self.checker_callback_tag:
419
293
            gobject.source_remove(self.checker_callback_tag)
420
294
            self.checker_callback_tag = None
421
 
        if getattr(self, u"checker", None) is None:
 
295
        if not hasattr(self, "checker") or self.checker is None:
422
296
            return
423
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
297
        logger.debug("Stopping checker for %(name)s", vars(self))
424
298
        try:
425
299
            os.kill(self.checker.pid, signal.SIGTERM)
426
300
            #os.sleep(0.5)
427
301
            #if self.checker.poll() is None:
428
302
            #    os.kill(self.checker.pid, signal.SIGKILL)
429
303
        except OSError, error:
430
 
            if error.errno != errno.ESRCH: # No such process
 
304
            if error.errno != errno.ESRCH:
431
305
                raise
432
306
        self.checker = None
433
 
    
434
 
    def still_valid(self):
 
307
    def still_valid(self, now=None):
435
308
        """Has the timeout not yet passed for this client?"""
436
 
        if not getattr(self, u"enabled", False):
437
 
            return False
438
 
        now = datetime.datetime.utcnow()
439
 
        if self.last_checked_ok is None:
 
309
        if now is None:
 
310
            now = datetime.datetime.now()
 
311
        if self.last_seen is None:
440
312
            return now < (self.created + self.timeout)
441
313
        else:
442
 
            return now < (self.last_checked_ok + self.timeout)
443
 
 
444
 
 
445
 
class ClientDBus(Client, dbus.service.Object):
446
 
    """A Client class using D-Bus
447
 
    
448
 
    Attributes:
449
 
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
450
 
    """
451
 
    # dbus.service.Object doesn't use super(), so we can't either.
452
 
    
453
 
    def __init__(self, *args, **kwargs):
454
 
        Client.__init__(self, *args, **kwargs)
455
 
        # Only now, when this client is initialized, can it show up on
456
 
        # the D-Bus
457
 
        self.dbus_object_path = (dbus.ObjectPath
458
 
                                 (u"/clients/"
459
 
                                  + self.name.replace(u".", u"_")))
460
 
        dbus.service.Object.__init__(self, bus,
461
 
                                     self.dbus_object_path)
462
 
    def enable(self):
463
 
        oldstate = getattr(self, u"enabled", False)
464
 
        r = Client.enable(self)
465
 
        if oldstate != self.enabled:
466
 
            # Emit D-Bus signals
467
 
            self.PropertyChanged(dbus.String(u"enabled"),
468
 
                                 dbus.Boolean(True, variant_level=1))
469
 
            self.PropertyChanged(dbus.String(u"last_enabled"),
470
 
                                 (_datetime_to_dbus(self.last_enabled,
471
 
                                                    variant_level=1)))
472
 
        return r
473
 
    
474
 
    def disable(self, signal = True):
475
 
        oldstate = getattr(self, u"enabled", False)
476
 
        r = Client.disable(self)
477
 
        if signal and oldstate != self.enabled:
478
 
            # Emit D-Bus signal
479
 
            self.PropertyChanged(dbus.String(u"enabled"),
480
 
                                 dbus.Boolean(False, variant_level=1))
481
 
        return r
482
 
    
483
 
    def __del__(self, *args, **kwargs):
484
 
        try:
485
 
            self.remove_from_connection()
486
 
        except LookupError:
487
 
            pass
488
 
        if hasattr(dbus.service.Object, u"__del__"):
489
 
            dbus.service.Object.__del__(self, *args, **kwargs)
490
 
        Client.__del__(self, *args, **kwargs)
491
 
    
492
 
    def checker_callback(self, pid, condition, command,
493
 
                         *args, **kwargs):
494
 
        self.checker_callback_tag = None
495
 
        self.checker = None
496
 
        # Emit D-Bus signal
497
 
        self.PropertyChanged(dbus.String(u"checker_running"),
498
 
                             dbus.Boolean(False, variant_level=1))
499
 
        if os.WIFEXITED(condition):
500
 
            exitstatus = os.WEXITSTATUS(condition)
501
 
            # Emit D-Bus signal
502
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
503
 
                                  dbus.Int64(condition),
504
 
                                  dbus.String(command))
505
 
        else:
506
 
            # Emit D-Bus signal
507
 
            self.CheckerCompleted(dbus.Int16(-1),
508
 
                                  dbus.Int64(condition),
509
 
                                  dbus.String(command))
510
 
        
511
 
        return Client.checker_callback(self, pid, condition, command,
512
 
                                       *args, **kwargs)
513
 
    
514
 
    def checked_ok(self, *args, **kwargs):
515
 
        r = Client.checked_ok(self, *args, **kwargs)
516
 
        # Emit D-Bus signal
517
 
        self.PropertyChanged(
518
 
            dbus.String(u"last_checked_ok"),
519
 
            (_datetime_to_dbus(self.last_checked_ok,
520
 
                               variant_level=1)))
521
 
        return r
522
 
    
523
 
    def start_checker(self, *args, **kwargs):
524
 
        old_checker = self.checker
525
 
        if self.checker is not None:
526
 
            old_checker_pid = self.checker.pid
527
 
        else:
528
 
            old_checker_pid = None
529
 
        r = Client.start_checker(self, *args, **kwargs)
530
 
        # Only if new checker process was started
531
 
        if (self.checker is not None
532
 
            and old_checker_pid != self.checker.pid):
533
 
            # Emit D-Bus signal
534
 
            self.CheckerStarted(self.current_checker_command)
535
 
            self.PropertyChanged(
536
 
                dbus.String(u"checker_running"),
537
 
                dbus.Boolean(True, variant_level=1))
538
 
        return r
539
 
    
540
 
    def stop_checker(self, *args, **kwargs):
541
 
        old_checker = getattr(self, u"checker", None)
542
 
        r = Client.stop_checker(self, *args, **kwargs)
543
 
        if (old_checker is not None
544
 
            and getattr(self, u"checker", None) is None):
545
 
            self.PropertyChanged(dbus.String(u"checker_running"),
546
 
                                 dbus.Boolean(False, variant_level=1))
547
 
        return r
548
 
    
549
 
    ## D-Bus methods & signals
550
 
    _interface = u"se.bsnet.fukt.Mandos.Client"
551
 
    
552
 
    # CheckedOK - method
553
 
    @dbus.service.method(_interface)
554
 
    def CheckedOK(self):
555
 
        return self.checked_ok()
556
 
    
557
 
    # CheckerCompleted - signal
558
 
    @dbus.service.signal(_interface, signature=u"nxs")
559
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
560
 
        "D-Bus signal"
561
 
        pass
562
 
    
563
 
    # CheckerStarted - signal
564
 
    @dbus.service.signal(_interface, signature=u"s")
565
 
    def CheckerStarted(self, command):
566
 
        "D-Bus signal"
567
 
        pass
568
 
    
569
 
    # GetAllProperties - method
570
 
    @dbus.service.method(_interface, out_signature=u"a{sv}")
571
 
    def GetAllProperties(self):
572
 
        "D-Bus method"
573
 
        return dbus.Dictionary({
574
 
                dbus.String(u"name"):
575
 
                    dbus.String(self.name, variant_level=1),
576
 
                dbus.String(u"fingerprint"):
577
 
                    dbus.String(self.fingerprint, variant_level=1),
578
 
                dbus.String(u"host"):
579
 
                    dbus.String(self.host, variant_level=1),
580
 
                dbus.String(u"created"):
581
 
                    _datetime_to_dbus(self.created, variant_level=1),
582
 
                dbus.String(u"last_enabled"):
583
 
                    (_datetime_to_dbus(self.last_enabled,
584
 
                                       variant_level=1)
585
 
                     if self.last_enabled is not None
586
 
                     else dbus.Boolean(False, variant_level=1)),
587
 
                dbus.String(u"enabled"):
588
 
                    dbus.Boolean(self.enabled, variant_level=1),
589
 
                dbus.String(u"last_checked_ok"):
590
 
                    (_datetime_to_dbus(self.last_checked_ok,
591
 
                                       variant_level=1)
592
 
                     if self.last_checked_ok is not None
593
 
                     else dbus.Boolean (False, variant_level=1)),
594
 
                dbus.String(u"timeout"):
595
 
                    dbus.UInt64(self.timeout_milliseconds(),
596
 
                                variant_level=1),
597
 
                dbus.String(u"interval"):
598
 
                    dbus.UInt64(self.interval_milliseconds(),
599
 
                                variant_level=1),
600
 
                dbus.String(u"checker"):
601
 
                    dbus.String(self.checker_command,
602
 
                                variant_level=1),
603
 
                dbus.String(u"checker_running"):
604
 
                    dbus.Boolean(self.checker is not None,
605
 
                                 variant_level=1),
606
 
                dbus.String(u"object_path"):
607
 
                    dbus.ObjectPath(self.dbus_object_path,
608
 
                                    variant_level=1)
609
 
                }, signature=u"sv")
610
 
    
611
 
    # IsStillValid - method
612
 
    @dbus.service.method(_interface, out_signature=u"b")
613
 
    def IsStillValid(self):
614
 
        return self.still_valid()
615
 
    
616
 
    # PropertyChanged - signal
617
 
    @dbus.service.signal(_interface, signature=u"sv")
618
 
    def PropertyChanged(self, property, value):
619
 
        "D-Bus signal"
620
 
        pass
621
 
    
622
 
    # ReceivedSecret - signal
623
 
    @dbus.service.signal(_interface)
624
 
    def ReceivedSecret(self):
625
 
        "D-Bus signal"
626
 
        pass
627
 
    
628
 
    # Rejected - signal
629
 
    @dbus.service.signal(_interface)
630
 
    def Rejected(self):
631
 
        "D-Bus signal"
632
 
        pass
633
 
    
634
 
    # SetChecker - method
635
 
    @dbus.service.method(_interface, in_signature=u"s")
636
 
    def SetChecker(self, checker):
637
 
        "D-Bus setter method"
638
 
        self.checker_command = checker
639
 
        # Emit D-Bus signal
640
 
        self.PropertyChanged(dbus.String(u"checker"),
641
 
                             dbus.String(self.checker_command,
642
 
                                         variant_level=1))
643
 
    
644
 
    # SetHost - method
645
 
    @dbus.service.method(_interface, in_signature=u"s")
646
 
    def SetHost(self, host):
647
 
        "D-Bus setter method"
648
 
        self.host = host
649
 
        # Emit D-Bus signal
650
 
        self.PropertyChanged(dbus.String(u"host"),
651
 
                             dbus.String(self.host, variant_level=1))
652
 
    
653
 
    # SetInterval - method
654
 
    @dbus.service.method(_interface, in_signature=u"t")
655
 
    def SetInterval(self, milliseconds):
656
 
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
657
 
        # Emit D-Bus signal
658
 
        self.PropertyChanged(dbus.String(u"interval"),
659
 
                             (dbus.UInt64(self.interval_milliseconds(),
660
 
                                          variant_level=1)))
661
 
    
662
 
    # SetSecret - method
663
 
    @dbus.service.method(_interface, in_signature=u"ay",
664
 
                         byte_arrays=True)
665
 
    def SetSecret(self, secret):
666
 
        "D-Bus setter method"
667
 
        self.secret = str(secret)
668
 
    
669
 
    # SetTimeout - method
670
 
    @dbus.service.method(_interface, in_signature=u"t")
671
 
    def SetTimeout(self, milliseconds):
672
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
673
 
        # Emit D-Bus signal
674
 
        self.PropertyChanged(dbus.String(u"timeout"),
675
 
                             (dbus.UInt64(self.timeout_milliseconds(),
676
 
                                          variant_level=1)))
677
 
    
678
 
    # Enable - method
679
 
    @dbus.service.method(_interface)
680
 
    def Enable(self):
681
 
        "D-Bus method"
682
 
        self.enable()
683
 
    
684
 
    # StartChecker - method
685
 
    @dbus.service.method(_interface)
686
 
    def StartChecker(self):
687
 
        "D-Bus method"
688
 
        self.start_checker()
689
 
    
690
 
    # Disable - method
691
 
    @dbus.service.method(_interface)
692
 
    def Disable(self):
693
 
        "D-Bus method"
694
 
        self.disable()
695
 
    
696
 
    # StopChecker - method
697
 
    @dbus.service.method(_interface)
698
 
    def StopChecker(self):
699
 
        self.stop_checker()
700
 
    
701
 
    del _interface
702
 
 
703
 
 
704
 
class ClientHandler(socketserver.BaseRequestHandler, object):
705
 
    """A class to handle client connections.
706
 
    
707
 
    Instantiated once for each connection to handle it.
 
314
            return now < (self.last_seen + self.timeout)
 
315
 
 
316
 
 
317
def peer_certificate(session):
 
318
    "Return the peer's OpenPGP certificate as a bytestring"
 
319
    # If not an OpenPGP certificate...
 
320
    if gnutls.library.functions.gnutls_certificate_type_get\
 
321
            (session._c_object) \
 
322
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
323
        # ...do the normal thing
 
324
        return session.peer_certificate
 
325
    list_size = ctypes.c_uint()
 
326
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
327
        (session._c_object, ctypes.byref(list_size))
 
328
    if list_size.value == 0:
 
329
        return None
 
330
    cert = cert_list[0]
 
331
    return ctypes.string_at(cert.data, cert.size)
 
332
 
 
333
 
 
334
def fingerprint(openpgp):
 
335
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
336
    # New empty GnuTLS certificate
 
337
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
338
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
339
        (ctypes.byref(crt))
 
340
    # New GnuTLS "datum" with the OpenPGP public key
 
341
    datum = gnutls.library.types.gnutls_datum_t\
 
342
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
343
                     ctypes.POINTER(ctypes.c_ubyte)),
 
344
         ctypes.c_uint(len(openpgp)))
 
345
    # Import the OpenPGP public key into the certificate
 
346
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
347
        (crt,
 
348
         ctypes.byref(datum),
 
349
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
350
    # New buffer for the fingerprint
 
351
    buffer = ctypes.create_string_buffer(20)
 
352
    buffer_length = ctypes.c_size_t()
 
353
    # Get the fingerprint from the certificate into the buffer
 
354
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
355
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
356
    # Deinit the certificate
 
357
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
358
    # Convert the buffer to a Python bytestring
 
359
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
360
    # Convert the bytestring to hexadecimal notation
 
361
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
362
    return hex_fpr
 
363
 
 
364
 
 
365
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
366
    """A TCP request handler class.
 
367
    Instantiated by IPv6_TCPServer for each request to handle it.
708
368
    Note: This will run in its own forked process."""
709
369
    
710
370
    def handle(self):
711
 
        logger.info(u"TCP connection from: %s",
712
 
                    unicode(self.client_address))
713
 
        logger.debug(u"IPC Pipe FD: %d", self.server.pipe[1])
714
 
        # Open IPC pipe to parent process
715
 
        with closing(os.fdopen(self.server.pipe[1], u"w", 1)) as ipc:
716
 
            session = (gnutls.connection
717
 
                       .ClientSession(self.request,
718
 
                                      gnutls.connection
719
 
                                      .X509Credentials()))
720
 
            
721
 
            line = self.request.makefile().readline()
722
 
            logger.debug(u"Protocol version: %r", line)
723
 
            try:
724
 
                if int(line.strip().split()[0]) > 1:
725
 
                    raise RuntimeError
726
 
            except (ValueError, IndexError, RuntimeError), error:
727
 
                logger.error(u"Unknown protocol version: %s", error)
728
 
                return
729
 
            
730
 
            # Note: gnutls.connection.X509Credentials is really a
731
 
            # generic GnuTLS certificate credentials object so long as
732
 
            # no X.509 keys are added to it.  Therefore, we can use it
733
 
            # here despite using OpenPGP certificates.
734
 
            
735
 
            #priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
736
 
            #                      u"+AES-256-CBC", u"+SHA1",
737
 
            #                      u"+COMP-NULL", u"+CTYPE-OPENPGP",
738
 
            #                      u"+DHE-DSS"))
739
 
            # Use a fallback default, since this MUST be set.
740
 
            priority = self.server.gnutls_priority
741
 
            if priority is None:
742
 
                priority = u"NORMAL"
743
 
            (gnutls.library.functions
744
 
             .gnutls_priority_set_direct(session._c_object,
745
 
                                         priority, None))
746
 
            
747
 
            try:
748
 
                session.handshake()
749
 
            except gnutls.errors.GNUTLSError, error:
750
 
                logger.warning(u"Handshake failed: %s", error)
751
 
                # Do not run session.bye() here: the session is not
752
 
                # established.  Just abandon the request.
753
 
                return
754
 
            logger.debug(u"Handshake succeeded")
755
 
            try:
756
 
                fpr = self.fingerprint(self.peer_certificate(session))
757
 
            except (TypeError, gnutls.errors.GNUTLSError), error:
758
 
                logger.warning(u"Bad certificate: %s", error)
759
 
                session.bye()
760
 
                return
761
 
            logger.debug(u"Fingerprint: %s", fpr)
762
 
            
763
 
            for c in self.server.clients:
764
 
                if c.fingerprint == fpr:
765
 
                    client = c
766
 
                    break
 
371
        logger.debug(u"TCP connection from: %s",
 
372
                     unicode(self.client_address))
 
373
        session = gnutls.connection.ClientSession(self.request,
 
374
                                                  gnutls.connection.\
 
375
                                                  X509Credentials())
 
376
        
 
377
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
378
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
379
        #                "+DHE-DSS"))
 
380
        priority = "SECURE256"
 
381
        
 
382
        gnutls.library.functions.gnutls_priority_set_direct\
 
383
            (session._c_object, priority, None);
 
384
        
 
385
        try:
 
386
            session.handshake()
 
387
        except gnutls.errors.GNUTLSError, error:
 
388
            logger.debug(u"Handshake failed: %s", error)
 
389
            # Do not run session.bye() here: the session is not
 
390
            # established.  Just abandon the request.
 
391
            return
 
392
        try:
 
393
            fpr = fingerprint(peer_certificate(session))
 
394
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
395
            logger.debug(u"Bad certificate: %s", error)
 
396
            session.bye()
 
397
            return
 
398
        logger.debug(u"Fingerprint: %s", fpr)
 
399
        client = None
 
400
        for c in self.server.clients:
 
401
            if c.fingerprint == fpr:
 
402
                client = c
 
403
                break
 
404
        # Have to check if client.still_valid(), since it is possible
 
405
        # that the client timed out while establishing the GnuTLS
 
406
        # session.
 
407
        if (not client) or (not client.still_valid()):
 
408
            if client:
 
409
                logger.debug(u"Client %(name)s is invalid",
 
410
                             vars(client))
767
411
            else:
768
 
                ipc.write(u"NOTFOUND %s\n" % fpr)
769
 
                session.bye()
770
 
                return
771
 
            # Have to check if client.still_valid(), since it is
772
 
            # possible that the client timed out while establishing
773
 
            # the GnuTLS session.
774
 
            if not client.still_valid():
775
 
                ipc.write(u"INVALID %s\n" % client.name)
776
 
                session.bye()
777
 
                return
778
 
            ipc.write(u"SENDING %s\n" % client.name)
779
 
            sent_size = 0
780
 
            while sent_size < len(client.secret):
781
 
                sent = session.send(client.secret[sent_size:])
782
 
                logger.debug(u"Sent: %d, remaining: %d",
783
 
                             sent, len(client.secret)
784
 
                             - (sent_size + sent))
785
 
                sent_size += sent
 
412
                logger.debug(u"Client not found for fingerprint: %s",
 
413
                             fpr)
786
414
            session.bye()
787
 
    
788
 
    @staticmethod
789
 
    def peer_certificate(session):
790
 
        "Return the peer's OpenPGP certificate as a bytestring"
791
 
        # If not an OpenPGP certificate...
792
 
        if (gnutls.library.functions
793
 
            .gnutls_certificate_type_get(session._c_object)
794
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
795
 
            # ...do the normal thing
796
 
            return session.peer_certificate
797
 
        list_size = ctypes.c_uint(1)
798
 
        cert_list = (gnutls.library.functions
799
 
                     .gnutls_certificate_get_peers
800
 
                     (session._c_object, ctypes.byref(list_size)))
801
 
        if not bool(cert_list) and list_size.value != 0:
802
 
            raise gnutls.errors.GNUTLSError(u"error getting peer"
803
 
                                            u" certificate")
804
 
        if list_size.value == 0:
805
 
            return None
806
 
        cert = cert_list[0]
807
 
        return ctypes.string_at(cert.data, cert.size)
808
 
    
809
 
    @staticmethod
810
 
    def fingerprint(openpgp):
811
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
812
 
        # New GnuTLS "datum" with the OpenPGP public key
813
 
        datum = (gnutls.library.types
814
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
815
 
                                             ctypes.POINTER
816
 
                                             (ctypes.c_ubyte)),
817
 
                                 ctypes.c_uint(len(openpgp))))
818
 
        # New empty GnuTLS certificate
819
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
820
 
        (gnutls.library.functions
821
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
822
 
        # Import the OpenPGP public key into the certificate
823
 
        (gnutls.library.functions
824
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
825
 
                                    gnutls.library.constants
826
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
827
 
        # Verify the self signature in the key
828
 
        crtverify = ctypes.c_uint()
829
 
        (gnutls.library.functions
830
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
831
 
                                         ctypes.byref(crtverify)))
832
 
        if crtverify.value != 0:
833
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
834
 
            raise (gnutls.errors.CertificateSecurityError
835
 
                   (u"Verify failed"))
836
 
        # New buffer for the fingerprint
837
 
        buf = ctypes.create_string_buffer(20)
838
 
        buf_len = ctypes.c_size_t()
839
 
        # Get the fingerprint from the certificate into the buffer
840
 
        (gnutls.library.functions
841
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
842
 
                                             ctypes.byref(buf_len)))
843
 
        # Deinit the certificate
844
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
845
 
        # Convert the buffer to a Python bytestring
846
 
        fpr = ctypes.string_at(buf, buf_len.value)
847
 
        # Convert the bytestring to hexadecimal notation
848
 
        hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
849
 
        return hex_fpr
850
 
 
851
 
 
852
 
class ForkingMixInWithPipe(socketserver.ForkingMixIn, object):
853
 
    """Like socketserver.ForkingMixIn, but also pass a pipe.
854
 
    
855
 
    Assumes a gobject.MainLoop event loop.
856
 
    """
857
 
    def process_request(self, request, client_address):
858
 
        """Overrides and wraps the original process_request().
859
 
        
860
 
        This function creates a new pipe in self.pipe 
861
 
        """
862
 
        self.pipe = os.pipe()
863
 
        super(ForkingMixInWithPipe,
864
 
              self).process_request(request, client_address)
865
 
        os.close(self.pipe[1])  # close write end
866
 
        # Call "handle_ipc" for both data and EOF events
867
 
        gobject.io_add_watch(self.pipe[0],
868
 
                             gobject.IO_IN | gobject.IO_HUP,
869
 
                             self.handle_ipc)
870
 
    def handle_ipc(source, condition):
871
 
        """Dummy function; override as necessary"""
872
 
        os.close(source)
873
 
        return False
874
 
 
875
 
 
876
 
class IPv6_TCPServer(ForkingMixInWithPipe,
877
 
                     socketserver.TCPServer, object):
878
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
879
 
    
 
415
            return
 
416
        sent_size = 0
 
417
        while sent_size < len(client.secret):
 
418
            sent = session.send(client.secret[sent_size:])
 
419
            logger.debug(u"Sent: %d, remaining: %d",
 
420
                         sent, len(client.secret)
 
421
                         - (sent_size + sent))
 
422
            sent_size += sent
 
423
        session.bye()
 
424
 
 
425
 
 
426
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
427
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
880
428
    Attributes:
881
 
        enabled:        Boolean; whether this server is activated yet
882
 
        interface:      None or a network interface name (string)
883
 
        use_ipv6:       Boolean; to use IPv6 or not
884
 
        ----
885
 
        clients:        set of Client objects
886
 
        gnutls_priority GnuTLS priority string
887
 
        use_dbus:       Boolean; to emit D-Bus signals or not
 
429
        options:        Command line options
 
430
        clients:        Set() of Client objects
888
431
    """
889
 
    def __init__(self, server_address, RequestHandlerClass,
890
 
                 interface=None, use_ipv6=True, clients=None,
891
 
                 gnutls_priority=None, use_dbus=True):
892
 
        self.enabled = False
893
 
        self.interface = interface
894
 
        if use_ipv6:
895
 
            self.address_family = socket.AF_INET6
896
 
        self.clients = clients
897
 
        self.use_dbus = use_dbus
898
 
        self.gnutls_priority = gnutls_priority
899
 
        socketserver.TCPServer.__init__(self, server_address,
900
 
                                        RequestHandlerClass)
 
432
    address_family = socket.AF_INET6
 
433
    def __init__(self, *args, **kwargs):
 
434
        if "options" in kwargs:
 
435
            self.options = kwargs["options"]
 
436
            del kwargs["options"]
 
437
        if "clients" in kwargs:
 
438
            self.clients = kwargs["clients"]
 
439
            del kwargs["clients"]
 
440
        return super(type(self), self).__init__(*args, **kwargs)
901
441
    def server_bind(self):
902
442
        """This overrides the normal server_bind() function
903
443
        to bind to an interface if one was specified, and also NOT to
904
444
        bind to an address or port if they were not specified."""
905
 
        if self.interface is not None:
 
445
        if self.options.interface:
 
446
            if not hasattr(socket, "SO_BINDTODEVICE"):
 
447
                # From /usr/include/asm-i486/socket.h
 
448
                socket.SO_BINDTODEVICE = 25
906
449
            try:
907
450
                self.socket.setsockopt(socket.SOL_SOCKET,
908
 
                                       SO_BINDTODEVICE,
909
 
                                       str(self.interface + u'\0'))
 
451
                                       socket.SO_BINDTODEVICE,
 
452
                                       self.options.interface)
910
453
            except socket.error, error:
911
454
                if error[0] == errno.EPERM:
912
 
                    logger.error(u"No permission to"
913
 
                                 u" bind to interface %s",
914
 
                                 self.interface)
 
455
                    logger.warning(u"No permission to"
 
456
                                   u" bind to interface %s",
 
457
                                   self.options.interface)
915
458
                else:
916
 
                    raise
 
459
                    raise error
917
460
        # Only bind(2) the socket if we really need to.
918
461
        if self.server_address[0] or self.server_address[1]:
919
462
            if not self.server_address[0]:
920
 
                if self.address_family == socket.AF_INET6:
921
 
                    any_address = u"::" # in6addr_any
922
 
                else:
923
 
                    any_address = socket.INADDR_ANY
924
 
                self.server_address = (any_address,
 
463
                in6addr_any = "::"
 
464
                self.server_address = (in6addr_any,
925
465
                                       self.server_address[1])
926
 
            elif not self.server_address[1]:
 
466
            elif self.server_address[1] is None:
927
467
                self.server_address = (self.server_address[0],
928
468
                                       0)
929
 
#                 if self.interface:
930
 
#                     self.server_address = (self.server_address[0],
931
 
#                                            0, # port
932
 
#                                            0, # flowinfo
933
 
#                                            if_nametoindex
934
 
#                                            (self.interface))
935
 
            return socketserver.TCPServer.server_bind(self)
936
 
    def server_activate(self):
937
 
        if self.enabled:
938
 
            return socketserver.TCPServer.server_activate(self)
939
 
    def enable(self):
940
 
        self.enabled = True
941
 
    def handle_ipc(self, source, condition, file_objects={}):
942
 
        condition_names = {
943
 
            gobject.IO_IN: u"IN",   # There is data to read.
944
 
            gobject.IO_OUT: u"OUT", # Data can be written (without
945
 
                                    # blocking).
946
 
            gobject.IO_PRI: u"PRI", # There is urgent data to read.
947
 
            gobject.IO_ERR: u"ERR", # Error condition.
948
 
            gobject.IO_HUP: u"HUP"  # Hung up (the connection has been
949
 
                                    # broken, usually for pipes and
950
 
                                    # sockets).
951
 
            }
952
 
        conditions_string = ' | '.join(name
953
 
                                       for cond, name in
954
 
                                       condition_names.iteritems()
955
 
                                       if cond & condition)
956
 
        logger.debug(u"Handling IPC: FD = %d, condition = %s", source,
957
 
                     conditions_string)
958
 
        
959
 
        # Turn the pipe file descriptor into a Python file object
960
 
        if source not in file_objects:
961
 
            file_objects[source] = os.fdopen(source, u"r", 1)
962
 
        
963
 
        # Read a line from the file object
964
 
        cmdline = file_objects[source].readline()
965
 
        if not cmdline:             # Empty line means end of file
966
 
            # close the IPC pipe
967
 
            file_objects[source].close()
968
 
            del file_objects[source]
969
 
            
970
 
            # Stop calling this function
971
 
            return False
972
 
        
973
 
        logger.debug(u"IPC command: %r", cmdline)
974
 
        
975
 
        # Parse and act on command
976
 
        cmd, args = cmdline.rstrip(u"\r\n").split(None, 1)
977
 
        
978
 
        if cmd == u"NOTFOUND":
979
 
            logger.warning(u"Client not found for fingerprint: %s",
980
 
                           args)
981
 
            if self.use_dbus:
982
 
                # Emit D-Bus signal
983
 
                mandos_dbus_service.ClientNotFound(args)
984
 
        elif cmd == u"INVALID":
985
 
            for client in self.clients:
986
 
                if client.name == args:
987
 
                    logger.warning(u"Client %s is invalid", args)
988
 
                    if self.use_dbus:
989
 
                        # Emit D-Bus signal
990
 
                        client.Rejected()
991
 
                    break
992
 
            else:
993
 
                logger.error(u"Unknown client %s is invalid", args)
994
 
        elif cmd == u"SENDING":
995
 
            for client in self.clients:
996
 
                if client.name == args:
997
 
                    logger.info(u"Sending secret to %s", client.name)
998
 
                    client.checked_ok()
999
 
                    if self.use_dbus:
1000
 
                        # Emit D-Bus signal
1001
 
                        client.ReceivedSecret()
1002
 
                    break
1003
 
            else:
1004
 
                logger.error(u"Sending secret to unknown client %s",
1005
 
                             args)
1006
 
        else:
1007
 
            logger.error(u"Unknown IPC command: %r", cmdline)
1008
 
        
1009
 
        # Keep calling this function
1010
 
        return True
 
469
            return super(type(self), self).server_bind()
1011
470
 
1012
471
 
1013
472
def string_to_delta(interval):
1014
473
    """Parse a string and return a datetime.timedelta
1015
 
    
1016
 
    >>> string_to_delta(u'7d')
 
474
 
 
475
    >>> string_to_delta('7d')
1017
476
    datetime.timedelta(7)
1018
 
    >>> string_to_delta(u'60s')
 
477
    >>> string_to_delta('60s')
1019
478
    datetime.timedelta(0, 60)
1020
 
    >>> string_to_delta(u'60m')
 
479
    >>> string_to_delta('60m')
1021
480
    datetime.timedelta(0, 3600)
1022
 
    >>> string_to_delta(u'24h')
 
481
    >>> string_to_delta('24h')
1023
482
    datetime.timedelta(1)
1024
483
    >>> string_to_delta(u'1w')
1025
484
    datetime.timedelta(7)
1026
 
    >>> string_to_delta(u'5m 30s')
1027
 
    datetime.timedelta(0, 330)
1028
485
    """
1029
 
    timevalue = datetime.timedelta(0)
1030
 
    for s in interval.split():
1031
 
        try:
1032
 
            suffix = unicode(s[-1])
1033
 
            value = int(s[:-1])
1034
 
            if suffix == u"d":
1035
 
                delta = datetime.timedelta(value)
1036
 
            elif suffix == u"s":
1037
 
                delta = datetime.timedelta(0, value)
1038
 
            elif suffix == u"m":
1039
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1040
 
            elif suffix == u"h":
1041
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1042
 
            elif suffix == u"w":
1043
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1044
 
            else:
1045
 
                raise ValueError
1046
 
        except (ValueError, IndexError):
 
486
    try:
 
487
        suffix=unicode(interval[-1])
 
488
        value=int(interval[:-1])
 
489
        if suffix == u"d":
 
490
            delta = datetime.timedelta(value)
 
491
        elif suffix == u"s":
 
492
            delta = datetime.timedelta(0, value)
 
493
        elif suffix == u"m":
 
494
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
495
        elif suffix == u"h":
 
496
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
497
        elif suffix == u"w":
 
498
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
499
        else:
1047
500
            raise ValueError
1048
 
        timevalue += delta
1049
 
    return timevalue
 
501
    except (ValueError, IndexError):
 
502
        raise ValueError
 
503
    return delta
 
504
 
 
505
 
 
506
def add_service():
 
507
    """Derived from the Avahi example code"""
 
508
    global group, serviceName, serviceType, servicePort, serviceTXT, \
 
509
           domain, host
 
510
    if group is None:
 
511
        group = dbus.Interface(
 
512
                bus.get_object( avahi.DBUS_NAME,
 
513
                                server.EntryGroupNew()),
 
514
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
515
        group.connect_to_signal('StateChanged',
 
516
                                entry_group_state_changed)
 
517
    logger.debug(u"Adding service '%s' of type '%s' ...",
 
518
                 serviceName, serviceType)
 
519
    
 
520
    group.AddService(
 
521
            serviceInterface,           # interface
 
522
            avahi.PROTO_INET6,          # protocol
 
523
            dbus.UInt32(0),             # flags
 
524
            serviceName, serviceType,
 
525
            domain, host,
 
526
            dbus.UInt16(servicePort),
 
527
            avahi.string_array_to_txt_array(serviceTXT))
 
528
    group.Commit()
 
529
 
 
530
 
 
531
def remove_service():
 
532
    """From the Avahi example code"""
 
533
    global group
 
534
    
 
535
    if not group is None:
 
536
        group.Reset()
1050
537
 
1051
538
 
1052
539
def server_state_changed(state):
1053
540
    """Derived from the Avahi example code"""
1054
541
    if state == avahi.SERVER_COLLISION:
1055
 
        logger.error(u"Zeroconf server name collision")
1056
 
        service.remove()
 
542
        logger.warning(u"Server name collision")
 
543
        remove_service()
1057
544
    elif state == avahi.SERVER_RUNNING:
1058
 
        service.add()
 
545
        add_service()
1059
546
 
1060
547
 
1061
548
def entry_group_state_changed(state, error):
1062
549
    """Derived from the Avahi example code"""
1063
 
    logger.debug(u"Avahi state change: %i", state)
 
550
    global serviceName, server, rename_count
 
551
    
 
552
    logger.debug(u"state change: %i", state)
1064
553
    
1065
554
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
1066
 
        logger.debug(u"Zeroconf service established.")
 
555
        logger.debug(u"Service established.")
1067
556
    elif state == avahi.ENTRY_GROUP_COLLISION:
1068
 
        logger.warning(u"Zeroconf service name collision.")
1069
 
        service.rename()
 
557
        
 
558
        rename_count = rename_count - 1
 
559
        if rename_count > 0:
 
560
            name = server.GetAlternativeServiceName(name)
 
561
            logger.warning(u"Service name collision, "
 
562
                           u"changing name to '%s' ...", name)
 
563
            remove_service()
 
564
            add_service()
 
565
            
 
566
        else:
 
567
            logger.error(u"No suitable service name found after %i"
 
568
                         u" retries, exiting.", n_rename)
 
569
            killme(1)
1070
570
    elif state == avahi.ENTRY_GROUP_FAILURE:
1071
 
        logger.critical(u"Avahi: Error in group state changed %s",
1072
 
                        unicode(error))
1073
 
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
 
571
        logger.error(u"Error in group state changed %s",
 
572
                     unicode(error))
 
573
        killme(1)
 
574
 
1074
575
 
1075
576
def if_nametoindex(interface):
1076
 
    """Call the C function if_nametoindex(), or equivalent
1077
 
    
1078
 
    Note: This function cannot accept a unicode string."""
1079
 
    global if_nametoindex
 
577
    """Call the C function if_nametoindex()"""
1080
578
    try:
1081
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1082
 
                          (ctypes.util.find_library(u"c"))
1083
 
                          .if_nametoindex)
 
579
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
580
        return libc.if_nametoindex(interface)
1084
581
    except (OSError, AttributeError):
1085
 
        logger.warning(u"Doing if_nametoindex the hard way")
1086
 
        def if_nametoindex(interface):
1087
 
            "Get an interface index the hard way, i.e. using fcntl()"
1088
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
1089
 
            with closing(socket.socket()) as s:
1090
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1091
 
                                    struct.pack(str(u"16s16x"),
1092
 
                                                interface))
1093
 
            interface_index = struct.unpack(str(u"I"),
1094
 
                                            ifreq[16:20])[0]
1095
 
            return interface_index
1096
 
    return if_nametoindex(interface)
1097
 
 
1098
 
 
1099
 
def daemon(nochdir = False, noclose = False):
 
582
        if "struct" not in sys.modules:
 
583
            import struct
 
584
        if "fcntl" not in sys.modules:
 
585
            import fcntl
 
586
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
587
        s = socket.socket()
 
588
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
589
                            struct.pack("16s16x", interface))
 
590
        s.close()
 
591
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
592
        return interface_index
 
593
 
 
594
 
 
595
def daemon(nochdir, noclose):
1100
596
    """See daemon(3).  Standard BSD Unix function.
1101
 
    
1102
597
    This should really exist as os.daemon, but it doesn't (yet)."""
1103
598
    if os.fork():
1104
599
        sys.exit()
1105
600
    os.setsid()
1106
601
    if not nochdir:
1107
 
        os.chdir(u"/")
1108
 
    if os.fork():
1109
 
        sys.exit()
 
602
        os.chdir("/")
1110
603
    if not noclose:
1111
604
        # Close all standard open file descriptors
1112
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
605
        null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
1113
606
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1114
607
            raise OSError(errno.ENODEV,
1115
 
                          u"/dev/null not a character device")
 
608
                          "/dev/null not a character device")
1116
609
        os.dup2(null, sys.stdin.fileno())
1117
610
        os.dup2(null, sys.stdout.fileno())
1118
611
        os.dup2(null, sys.stderr.fileno())
1120
613
            os.close(null)
1121
614
 
1122
615
 
 
616
def killme(status = 0):
 
617
    logger.debug("Stopping server with exit status %d", status)
 
618
    exitstatus = status
 
619
    if main_loop_started:
 
620
        main_loop.quit()
 
621
    else:
 
622
        sys.exit(status)
 
623
 
 
624
 
1123
625
def main():
1124
 
    
1125
 
    ######################################################################
1126
 
    # Parsing of options, both command line and config file
1127
 
    
1128
 
    parser = optparse.OptionParser(version = "%%prog %s" % version)
1129
 
    parser.add_option("-i", u"--interface", type=u"string",
1130
 
                      metavar="IF", help=u"Bind to interface IF")
1131
 
    parser.add_option("-a", u"--address", type=u"string",
1132
 
                      help=u"Address to listen for requests on")
1133
 
    parser.add_option("-p", u"--port", type=u"int",
1134
 
                      help=u"Port number to receive requests on")
1135
 
    parser.add_option("--check", action=u"store_true",
1136
 
                      help=u"Run self-test")
1137
 
    parser.add_option("--debug", action=u"store_true",
1138
 
                      help=u"Debug mode; run in foreground and log to"
1139
 
                      u" terminal")
1140
 
    parser.add_option("--priority", type=u"string", help=u"GnuTLS"
1141
 
                      u" priority string (see GnuTLS documentation)")
1142
 
    parser.add_option("--servicename", type=u"string",
1143
 
                      metavar=u"NAME", help=u"Zeroconf service name")
1144
 
    parser.add_option("--configdir", type=u"string",
1145
 
                      default=u"/etc/mandos", metavar=u"DIR",
1146
 
                      help=u"Directory to search for configuration"
1147
 
                      u" files")
1148
 
    parser.add_option("--no-dbus", action=u"store_false",
1149
 
                      dest=u"use_dbus", help=u"Do not provide D-Bus"
1150
 
                      u" system bus interface")
1151
 
    parser.add_option("--no-ipv6", action=u"store_false",
1152
 
                      dest=u"use_ipv6", help=u"Do not use IPv6")
1153
 
    options = parser.parse_args()[0]
 
626
    global exitstatus
 
627
    exitstatus = 0
 
628
    global main_loop_started
 
629
    main_loop_started = False
 
630
    
 
631
    parser = OptionParser()
 
632
    parser.add_option("-i", "--interface", type="string",
 
633
                      default=None, metavar="IF",
 
634
                      help="Bind to interface IF")
 
635
    parser.add_option("-a", "--address", type="string", default=None,
 
636
                      help="Address to listen for requests on")
 
637
    parser.add_option("-p", "--port", type="int", default=None,
 
638
                      help="Port number to receive requests on")
 
639
    parser.add_option("--timeout", type="string", # Parsed later
 
640
                      default="1h",
 
641
                      help="Amount of downtime allowed for clients")
 
642
    parser.add_option("--interval", type="string", # Parsed later
 
643
                      default="5m",
 
644
                      help="How often to check that a client is up")
 
645
    parser.add_option("--check", action="store_true", default=False,
 
646
                      help="Run self-test")
 
647
    parser.add_option("--debug", action="store_true", default=False,
 
648
                      help="Debug mode")
 
649
    (options, args) = parser.parse_args()
1154
650
    
1155
651
    if options.check:
1156
652
        import doctest
1157
653
        doctest.testmod()
1158
654
        sys.exit()
1159
655
    
1160
 
    # Default values for config file for server-global settings
1161
 
    server_defaults = { u"interface": u"",
1162
 
                        u"address": u"",
1163
 
                        u"port": u"",
1164
 
                        u"debug": u"False",
1165
 
                        u"priority":
1166
 
                        u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1167
 
                        u"servicename": u"Mandos",
1168
 
                        u"use_dbus": u"True",
1169
 
                        u"use_ipv6": u"True",
1170
 
                        }
1171
 
    
1172
 
    # Parse config file for server-global settings
1173
 
    server_config = configparser.SafeConfigParser(server_defaults)
1174
 
    del server_defaults
1175
 
    server_config.read(os.path.join(options.configdir,
1176
 
                                    u"mandos.conf"))
1177
 
    # Convert the SafeConfigParser object to a dict
1178
 
    server_settings = server_config.defaults()
1179
 
    # Use the appropriate methods on the non-string config options
1180
 
    for option in (u"debug", u"use_dbus", u"use_ipv6"):
1181
 
        server_settings[option] = server_config.getboolean(u"DEFAULT",
1182
 
                                                           option)
1183
 
    if server_settings["port"]:
1184
 
        server_settings["port"] = server_config.getint(u"DEFAULT",
1185
 
                                                       u"port")
1186
 
    del server_config
1187
 
    
1188
 
    # Override the settings from the config file with command line
1189
 
    # options, if set.
1190
 
    for option in (u"interface", u"address", u"port", u"debug",
1191
 
                   u"priority", u"servicename", u"configdir",
1192
 
                   u"use_dbus", u"use_ipv6"):
1193
 
        value = getattr(options, option)
1194
 
        if value is not None:
1195
 
            server_settings[option] = value
1196
 
    del options
1197
 
    # Force all strings to be unicode
1198
 
    for option in server_settings.keys():
1199
 
        if type(server_settings[option]) is str:
1200
 
            server_settings[option] = unicode(server_settings[option])
1201
 
    # Now we have our good server settings in "server_settings"
1202
 
    
1203
 
    ##################################################################
1204
 
    
1205
 
    # For convenience
1206
 
    debug = server_settings[u"debug"]
1207
 
    use_dbus = server_settings[u"use_dbus"]
1208
 
    use_ipv6 = server_settings[u"use_ipv6"]
1209
 
    
1210
 
    if not debug:
1211
 
        syslogger.setLevel(logging.WARNING)
1212
 
        console.setLevel(logging.WARNING)
1213
 
    
1214
 
    if server_settings[u"servicename"] != u"Mandos":
1215
 
        syslogger.setFormatter(logging.Formatter
1216
 
                               (u'Mandos (%s) [%%(process)d]:'
1217
 
                                u' %%(levelname)s: %%(message)s'
1218
 
                                % server_settings[u"servicename"]))
1219
 
    
1220
 
    # Parse config file with clients
1221
 
    client_defaults = { u"timeout": u"1h",
1222
 
                        u"interval": u"5m",
1223
 
                        u"checker": u"fping -q -- %%(host)s",
1224
 
                        u"host": u"",
1225
 
                        }
1226
 
    client_config = configparser.SafeConfigParser(client_defaults)
1227
 
    client_config.read(os.path.join(server_settings[u"configdir"],
1228
 
                                    u"clients.conf"))
1229
 
    
1230
 
    global mandos_dbus_service
1231
 
    mandos_dbus_service = None
1232
 
    
1233
 
    clients = set()
1234
 
    tcp_server = IPv6_TCPServer((server_settings[u"address"],
1235
 
                                 server_settings[u"port"]),
1236
 
                                ClientHandler,
1237
 
                                interface=
1238
 
                                server_settings[u"interface"],
1239
 
                                use_ipv6=use_ipv6,
1240
 
                                clients=clients,
1241
 
                                gnutls_priority=
1242
 
                                server_settings[u"priority"],
1243
 
                                use_dbus=use_dbus)
1244
 
    pidfilename = u"/var/run/mandos.pid"
1245
 
    try:
1246
 
        pidfile = open(pidfilename, u"w")
1247
 
    except IOError:
1248
 
        logger.error(u"Could not open file %r", pidfilename)
1249
 
    
1250
 
    try:
1251
 
        uid = pwd.getpwnam(u"_mandos").pw_uid
1252
 
        gid = pwd.getpwnam(u"_mandos").pw_gid
1253
 
    except KeyError:
1254
 
        try:
1255
 
            uid = pwd.getpwnam(u"mandos").pw_uid
1256
 
            gid = pwd.getpwnam(u"mandos").pw_gid
1257
 
        except KeyError:
1258
 
            try:
1259
 
                uid = pwd.getpwnam(u"nobody").pw_uid
1260
 
                gid = pwd.getpwnam(u"nobody").pw_gid
1261
 
            except KeyError:
1262
 
                uid = 65534
1263
 
                gid = 65534
1264
 
    try:
1265
 
        os.setgid(gid)
1266
 
        os.setuid(uid)
1267
 
    except OSError, error:
1268
 
        if error[0] != errno.EPERM:
1269
 
            raise error
1270
 
    
1271
 
    # Enable all possible GnuTLS debugging
1272
 
    if debug:
1273
 
        # "Use a log level over 10 to enable all debugging options."
1274
 
        # - GnuTLS manual
1275
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1276
 
        
1277
 
        @gnutls.library.types.gnutls_log_func
1278
 
        def debug_gnutls(level, string):
1279
 
            logger.debug(u"GnuTLS: %s", string[:-1])
1280
 
        
1281
 
        (gnutls.library.functions
1282
 
         .gnutls_global_set_log_function(debug_gnutls))
1283
 
    
1284
 
    global service
1285
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1286
 
    service = AvahiService(name = server_settings[u"servicename"],
1287
 
                           servicetype = u"_mandos._tcp",
1288
 
                           protocol = protocol)
1289
 
    if server_settings["interface"]:
1290
 
        service.interface = (if_nametoindex
1291
 
                             (str(server_settings[u"interface"])))
 
656
    # Parse the time arguments
 
657
    try:
 
658
        options.timeout = string_to_delta(options.timeout)
 
659
    except ValueError:
 
660
        parser.error("option --timeout: Unparseable time")
 
661
    try:
 
662
        options.interval = string_to_delta(options.interval)
 
663
    except ValueError:
 
664
        parser.error("option --interval: Unparseable time")
 
665
    
 
666
    # Parse config file
 
667
    defaults = { "checker": "fping -q -- %%(fqdn)s" }
 
668
    client_config = ConfigParser.SafeConfigParser(defaults)
 
669
    #client_config.readfp(open("global.conf"), "global.conf")
 
670
    client_config.read("mandos-clients.conf")
1292
671
    
1293
672
    global main_loop
1294
673
    global bus
1297
676
    DBusGMainLoop(set_as_default=True )
1298
677
    main_loop = gobject.MainLoop()
1299
678
    bus = dbus.SystemBus()
1300
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1301
 
                                           avahi.DBUS_PATH_SERVER),
1302
 
                            avahi.DBUS_INTERFACE_SERVER)
 
679
    server = dbus.Interface(
 
680
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
681
            avahi.DBUS_INTERFACE_SERVER )
1303
682
    # End of Avahi example code
1304
 
    if use_dbus:
1305
 
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
1306
683
    
1307
 
    client_class = Client
1308
 
    if use_dbus:
1309
 
        client_class = ClientDBus
1310
 
    clients.update(set(
1311
 
            client_class(name = section,
1312
 
                         config= dict(client_config.items(section)))
1313
 
            for section in client_config.sections()))
1314
 
    if not clients:
1315
 
        logger.warning(u"No clients defined")
 
684
    debug = options.debug
1316
685
    
1317
686
    if debug:
1318
 
        # Redirect stdin so all checkers get /dev/null
1319
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1320
 
        os.dup2(null, sys.stdin.fileno())
1321
 
        if null > 2:
1322
 
            os.close(null)
1323
 
    else:
1324
 
        # No console logging
1325
 
        logger.removeHandler(console)
1326
 
        # Close all input and output, do double fork, etc.
1327
 
        daemon()
1328
 
    
1329
 
    try:
1330
 
        with closing(pidfile):
1331
 
            pid = os.getpid()
1332
 
            pidfile.write(str(pid) + "\n")
1333
 
        del pidfile
1334
 
    except IOError:
1335
 
        logger.error(u"Could not write to file %r with PID %d",
1336
 
                     pidfilename, pid)
1337
 
    except NameError:
1338
 
        # "pidfile" was never created
1339
 
        pass
1340
 
    del pidfilename
 
687
        console = logging.StreamHandler()
 
688
        # console.setLevel(logging.DEBUG)
 
689
        console.setFormatter(logging.Formatter\
 
690
                             ('%(levelname)s: %(message)s'))
 
691
        logger.addHandler(console)
 
692
        del console
 
693
    
 
694
    clients = Set()
 
695
    def remove_from_clients(client):
 
696
        clients.remove(client)
 
697
        if not clients:
 
698
            logger.debug(u"No clients left, exiting")
 
699
            killme()
 
700
    
 
701
    clients.update(Set(Client(name=section, options=options,
 
702
                              stop_hook = remove_from_clients,
 
703
                              **(dict(client_config\
 
704
                                      .items(section))))
 
705
                       for section in client_config.sections()))
 
706
    
 
707
    if not debug:
 
708
        daemon(False, False)
1341
709
    
1342
710
    def cleanup():
1343
711
        "Cleanup function; run on exit"
1350
718
        
1351
719
        while clients:
1352
720
            client = clients.pop()
1353
 
            client.disable_hook = None
1354
 
            client.disable()
 
721
            client.stop_hook = None
 
722
            client.stop()
1355
723
    
1356
724
    atexit.register(cleanup)
1357
725
    
1358
726
    if not debug:
1359
727
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1360
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1361
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1362
 
    
1363
 
    if use_dbus:
1364
 
        class MandosDBusService(dbus.service.Object):
1365
 
            """A D-Bus proxy object"""
1366
 
            def __init__(self):
1367
 
                dbus.service.Object.__init__(self, bus, u"/")
1368
 
            _interface = u"se.bsnet.fukt.Mandos"
1369
 
            
1370
 
            @dbus.service.signal(_interface, signature=u"oa{sv}")
1371
 
            def ClientAdded(self, objpath, properties):
1372
 
                "D-Bus signal"
1373
 
                pass
1374
 
            
1375
 
            @dbus.service.signal(_interface, signature=u"s")
1376
 
            def ClientNotFound(self, fingerprint):
1377
 
                "D-Bus signal"
1378
 
                pass
1379
 
            
1380
 
            @dbus.service.signal(_interface, signature=u"os")
1381
 
            def ClientRemoved(self, objpath, name):
1382
 
                "D-Bus signal"
1383
 
                pass
1384
 
            
1385
 
            @dbus.service.method(_interface, out_signature=u"ao")
1386
 
            def GetAllClients(self):
1387
 
                "D-Bus method"
1388
 
                return dbus.Array(c.dbus_object_path for c in clients)
1389
 
            
1390
 
            @dbus.service.method(_interface,
1391
 
                                 out_signature=u"a{oa{sv}}")
1392
 
            def GetAllClientsWithProperties(self):
1393
 
                "D-Bus method"
1394
 
                return dbus.Dictionary(
1395
 
                    ((c.dbus_object_path, c.GetAllProperties())
1396
 
                     for c in clients),
1397
 
                    signature=u"oa{sv}")
1398
 
            
1399
 
            @dbus.service.method(_interface, in_signature=u"o")
1400
 
            def RemoveClient(self, object_path):
1401
 
                "D-Bus method"
1402
 
                for c in clients:
1403
 
                    if c.dbus_object_path == object_path:
1404
 
                        clients.remove(c)
1405
 
                        c.remove_from_connection()
1406
 
                        # Don't signal anything except ClientRemoved
1407
 
                        c.disable(signal=False)
1408
 
                        # Emit D-Bus signal
1409
 
                        self.ClientRemoved(object_path, c.name)
1410
 
                        return
1411
 
                raise KeyError
1412
 
            
1413
 
            del _interface
1414
 
        
1415
 
        mandos_dbus_service = MandosDBusService()
 
728
    signal.signal(signal.SIGHUP, lambda signum, frame: killme())
 
729
    signal.signal(signal.SIGTERM, lambda signum, frame: killme())
1416
730
    
1417
731
    for client in clients:
1418
 
        if use_dbus:
1419
 
            # Emit D-Bus signal
1420
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path,
1421
 
                                            client.GetAllProperties())
1422
 
        client.enable()
1423
 
    
1424
 
    tcp_server.enable()
1425
 
    tcp_server.server_activate()
1426
 
    
1427
 
    # Find out what port we got
1428
 
    service.port = tcp_server.socket.getsockname()[1]
1429
 
    if use_ipv6:
1430
 
        logger.info(u"Now listening on address %r, port %d,"
1431
 
                    " flowinfo %d, scope_id %d"
1432
 
                    % tcp_server.socket.getsockname())
1433
 
    else:                       # IPv4
1434
 
        logger.info(u"Now listening on address %r, port %d"
1435
 
                    % tcp_server.socket.getsockname())
1436
 
    
1437
 
    #service.interface = tcp_server.socket.getsockname()[3]
1438
 
    
1439
 
    try:
1440
 
        # From the Avahi example code
1441
 
        server.connect_to_signal(u"StateChanged", server_state_changed)
1442
 
        try:
1443
 
            server_state_changed(server.GetState())
1444
 
        except dbus.exceptions.DBusException, error:
1445
 
            logger.critical(u"DBusException: %s", error)
1446
 
            sys.exit(1)
1447
 
        # End of Avahi example code
1448
 
        
1449
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1450
 
                             lambda *args, **kwargs:
1451
 
                             (tcp_server.handle_request
1452
 
                              (*args[2:], **kwargs) or True))
1453
 
        
1454
 
        logger.debug(u"Starting main loop")
 
732
        client.start()
 
733
    
 
734
    tcp_server = IPv6_TCPServer((options.address, options.port),
 
735
                                tcp_handler,
 
736
                                options=options,
 
737
                                clients=clients)
 
738
    # Find out what random port we got
 
739
    global servicePort
 
740
    servicePort = tcp_server.socket.getsockname()[1]
 
741
    logger.debug(u"Now listening on port %d", servicePort)
 
742
    
 
743
    if options.interface is not None:
 
744
        global serviceInterface
 
745
        serviceInterface = if_nametoindex(options.interface)
 
746
    
 
747
    # From the Avahi example code
 
748
    server.connect_to_signal("StateChanged", server_state_changed)
 
749
    try:
 
750
        server_state_changed(server.GetState())
 
751
    except dbus.exceptions.DBusException, error:
 
752
        logger.critical(u"DBusException: %s", error)
 
753
        killme(1)
 
754
    # End of Avahi example code
 
755
    
 
756
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
757
                         lambda *args, **kwargs:
 
758
                         tcp_server.handle_request(*args[2:],
 
759
                                                   **kwargs) or True)
 
760
    try:
 
761
        logger.debug("Starting main loop")
 
762
        main_loop_started = True
1455
763
        main_loop.run()
1456
 
    except AvahiError, error:
1457
 
        logger.critical(u"AvahiError: %s", error)
1458
 
        sys.exit(1)
1459
764
    except KeyboardInterrupt:
1460
765
        if debug:
1461
 
            print >> sys.stderr
1462
 
        logger.debug(u"Server received KeyboardInterrupt")
1463
 
    logger.debug(u"Server exiting")
 
766
            print
 
767
    
 
768
    sys.exit(exitstatus)
1464
769
 
1465
770
if __name__ == '__main__':
1466
771
    main()