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

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

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

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server.py
1
1
#!/usr/bin/python
2
 
# -*- mode: python; coding: utf-8 -*-
3
 
# 
4
 
# Mandos server - give out binary blobs to connecting clients.
5
 
# 
6
 
# This program is partly derived from an example program for an Avahi
7
 
# service publisher, downloaded from
8
 
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add" and "remove" in the "AvahiService" class, the
10
 
# "server_state_changed" and "entry_group_state_changed" functions,
11
 
# and some lines in "main".
12
 
# 
13
 
# Everything else is
14
 
# Copyright © 2008,2009 Teddy Hogeborn
15
 
# Copyright © 2008,2009 Björn Påhlsson
16
 
# 
17
 
# This program is free software: you can redistribute it and/or modify
18
 
# it under the terms of the GNU General Public License as published by
19
 
# the Free Software Foundation, either version 3 of the License, or
20
 
# (at your option) any later version.
21
 
#
22
 
#     This program is distributed in the hope that it will be useful,
23
 
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
24
 
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25
 
#     GNU General Public License for more details.
26
 
# 
27
 
# You should have received a copy of the GNU General Public License
28
 
# along with this program.  If not, see
29
 
# <http://www.gnu.org/licenses/>.
30
 
# 
31
 
# Contact the authors at <mandos@fukt.bsnet.se>.
32
 
# 
33
2
 
34
 
from __future__ import division, with_statement, absolute_import
 
3
from __future__ import division
35
4
 
36
5
import SocketServer
37
6
import socket
38
 
import optparse
 
7
import select
 
8
from optparse import OptionParser
39
9
import datetime
40
10
import errno
41
11
import gnutls.crypto
51
21
import signal
52
22
from sets import Set
53
23
import subprocess
54
 
import atexit
55
 
import stat
56
 
import logging
57
 
import logging.handlers
58
 
import pwd
59
 
from contextlib import closing
60
24
 
61
25
import dbus
62
 
import dbus.service
63
26
import gobject
64
27
import avahi
65
28
from dbus.mainloop.glib import DBusGMainLoop
66
29
import ctypes
67
 
import ctypes.util
68
 
 
69
 
version = "1.0.8"
70
 
 
71
 
logger = logging.Logger('mandos')
72
 
syslogger = (logging.handlers.SysLogHandler
73
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
74
 
              address = "/dev/log"))
75
 
syslogger.setFormatter(logging.Formatter
76
 
                       ('Mandos [%(process)d]: %(levelname)s:'
77
 
                        ' %(message)s'))
78
 
logger.addHandler(syslogger)
79
 
 
80
 
console = logging.StreamHandler()
81
 
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
82
 
                                       ' %(levelname)s: %(message)s'))
83
 
logger.addHandler(console)
84
 
 
85
 
class AvahiError(Exception):
86
 
    def __init__(self, value, *args, **kwargs):
87
 
        self.value = value
88
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
89
 
    def __unicode__(self):
90
 
        return unicode(repr(self.value))
91
 
 
92
 
class AvahiServiceError(AvahiError):
93
 
    pass
94
 
 
95
 
class AvahiGroupError(AvahiError):
96
 
    pass
97
 
 
98
 
 
99
 
class AvahiService(object):
100
 
    """An Avahi (Zeroconf) service.
101
 
    Attributes:
102
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
103
 
               Used to optionally bind to the specified interface.
104
 
    name: string; Example: 'Mandos'
105
 
    type: string; Example: '_mandos._tcp'.
106
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
107
 
    port: integer; what port to announce
108
 
    TXT: list of strings; TXT record for the service
109
 
    domain: string; Domain to publish on, default to .local if empty.
110
 
    host: string; Host to publish records for, default is localhost
111
 
    max_renames: integer; maximum number of renames
112
 
    rename_count: integer; counter so we only rename after collisions
113
 
                  a sensible number of times
114
 
    """
115
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
116
 
                 servicetype = None, port = None, TXT = None,
117
 
                 domain = "", host = "", max_renames = 32768,
118
 
                 protocol = avahi.PROTO_UNSPEC):
119
 
        self.interface = interface
120
 
        self.name = name
121
 
        self.type = servicetype
122
 
        self.port = port
123
 
        self.TXT = TXT if TXT is not None else []
124
 
        self.domain = domain
125
 
        self.host = host
126
 
        self.rename_count = 0
127
 
        self.max_renames = max_renames
128
 
        self.protocol = protocol
129
 
    def rename(self):
130
 
        """Derived from the Avahi example code"""
131
 
        if self.rename_count >= self.max_renames:
132
 
            logger.critical(u"No suitable Zeroconf service name found"
133
 
                            u" after %i retries, exiting.",
134
 
                            self.rename_count)
135
 
            raise AvahiServiceError(u"Too many renames")
136
 
        self.name = server.GetAlternativeServiceName(self.name)
137
 
        logger.info(u"Changing Zeroconf service name to %r ...",
138
 
                    str(self.name))
139
 
        syslogger.setFormatter(logging.Formatter
140
 
                               ('Mandos (%s) [%%(process)d]:'
141
 
                                ' %%(levelname)s: %%(message)s'
142
 
                                % self.name))
143
 
        self.remove()
144
 
        self.add()
145
 
        self.rename_count += 1
146
 
    def remove(self):
147
 
        """Derived from the Avahi example code"""
148
 
        if group is not None:
149
 
            group.Reset()
150
 
    def add(self):
151
 
        """Derived from the Avahi example code"""
152
 
        global group
153
 
        if group is None:
154
 
            group = dbus.Interface(bus.get_object
155
 
                                   (avahi.DBUS_NAME,
156
 
                                    server.EntryGroupNew()),
157
 
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
158
 
            group.connect_to_signal('StateChanged',
159
 
                                    entry_group_state_changed)
160
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
161
 
                     service.name, service.type)
162
 
        group.AddService(
163
 
                self.interface,         # interface
164
 
                self.protocol,          # protocol
165
 
                dbus.UInt32(0),         # flags
166
 
                self.name, self.type,
167
 
                self.domain, self.host,
168
 
                dbus.UInt16(self.port),
169
 
                avahi.string_array_to_txt_array(self.TXT))
170
 
        group.Commit()
171
 
 
172
 
# From the Avahi example code:
173
 
group = None                            # our entry group
 
30
 
 
31
# This variable is used to optionally bind to a specified interface.
 
32
# It is a global variable to fit in with the other variables from the
 
33
# Avahi server example code.
 
34
serviceInterface = avahi.IF_UNSPEC
 
35
# From the Avahi server example code:
 
36
serviceName = "Mandos"
 
37
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
38
servicePort = None                      # Not known at startup
 
39
serviceTXT = []                         # TXT record for the service
 
40
domain = ""                  # Domain to publish on, default to .local
 
41
host = ""          # Host to publish records for, default to localhost
 
42
group = None #our entry group
 
43
rename_count = 12       # Counter so we only rename after collisions a
 
44
                        # sensible number of times
174
45
# End of Avahi example code
175
46
 
176
47
 
177
 
def _datetime_to_dbus(dt, variant_level=0):
178
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
179
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
180
 
 
181
 
 
182
48
class Client(object):
183
49
    """A representation of a client host served by this server.
184
50
    Attributes:
185
 
    name:       string; from the config file, used in log messages and
186
 
                        D-Bus identifiers
 
51
    name:      string; from the config file, used in log messages
187
52
    fingerprint: string (40 or 32 hexadecimal digits); used to
188
53
                 uniquely identify the client
189
 
    secret:     bytestring; sent verbatim (over TLS) to client
190
 
    host:       string; available for use by the checker command
191
 
    created:    datetime.datetime(); (UTC) object creation
192
 
    last_enabled: datetime.datetime(); (UTC)
193
 
    enabled:    bool()
194
 
    last_checked_ok: datetime.datetime(); (UTC) or None
195
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
196
 
                                      until this client is invalid
197
 
    interval:   datetime.timedelta(); How often to start a new checker
198
 
    disable_hook:  If set, called by disable() as disable_hook(self)
199
 
    checker:    subprocess.Popen(); a running checker process used
200
 
                                    to see if the client lives.
201
 
                                    'None' if no process is running.
 
54
    secret:    bytestring; sent verbatim (over TLS) to client
 
55
    fqdn:      string (FQDN); available for use by the checker command
 
56
    created:   datetime.datetime()
 
57
    last_seen: datetime.datetime() or None if not yet seen
 
58
    timeout:   datetime.timedelta(); How long from last_seen until
 
59
                                     this client is invalid
 
60
    interval:  datetime.timedelta(); How often to start a new checker
 
61
    stop_hook: If set, called by stop() as stop_hook(self)
 
62
    checker:   subprocess.Popen(); a running checker process used
 
63
                                   to see if the client lives.
 
64
                                   Is None if no process is running.
202
65
    checker_initiator_tag: a gobject event source tag, or None
203
 
    disable_initiator_tag:    - '' -
 
66
    stop_initiator_tag:    - '' -
204
67
    checker_callback_tag:  - '' -
205
68
    checker_command: string; External command which is run to check if
206
 
                     client lives.  %() expansions are done at
 
69
                     client lives.  %()s expansions are done at
207
70
                     runtime with vars(self) as dict, so that for
208
71
                     instance %(name)s can be used in the command.
209
 
    current_checker_command: string; current running checker_command
 
72
    Private attibutes:
 
73
    _timeout: Real variable for 'timeout'
 
74
    _interval: Real variable for 'interval'
 
75
    _timeout_milliseconds: Used by gobject.timeout_add()
 
76
    _interval_milliseconds: - '' -
210
77
    """
211
 
    def timeout_milliseconds(self):
212
 
        "Return the 'timeout' attribute in milliseconds"
213
 
        return ((self.timeout.days * 24 * 60 * 60 * 1000)
214
 
                + (self.timeout.seconds * 1000)
215
 
                + (self.timeout.microseconds // 1000))
216
 
    
217
 
    def interval_milliseconds(self):
218
 
        "Return the 'interval' attribute in milliseconds"
219
 
        return ((self.interval.days * 24 * 60 * 60 * 1000)
220
 
                + (self.interval.seconds * 1000)
221
 
                + (self.interval.microseconds // 1000))
222
 
    
223
 
    def __init__(self, name = None, disable_hook=None, config=None):
224
 
        """Note: the 'checker' key in 'config' sets the
225
 
        'checker_command' attribute and *not* the 'checker'
226
 
        attribute."""
 
78
    def _set_timeout(self, timeout):
 
79
        "Setter function for 'timeout' attribute"
 
80
        self._timeout = timeout
 
81
        self._timeout_milliseconds = ((self.timeout.days
 
82
                                       * 24 * 60 * 60 * 1000)
 
83
                                      + (self.timeout.seconds * 1000)
 
84
                                      + (self.timeout.microseconds
 
85
                                         // 1000))
 
86
    timeout = property(lambda self: self._timeout,
 
87
                       _set_timeout)
 
88
    del _set_timeout
 
89
    def _set_interval(self, interval):
 
90
        "Setter function for 'interval' attribute"
 
91
        self._interval = interval
 
92
        self._interval_milliseconds = ((self.interval.days
 
93
                                        * 24 * 60 * 60 * 1000)
 
94
                                       + (self.interval.seconds
 
95
                                          * 1000)
 
96
                                       + (self.interval.microseconds
 
97
                                          // 1000))
 
98
    interval = property(lambda self: self._interval,
 
99
                        _set_interval)
 
100
    del _set_interval
 
101
    def __init__(self, name=None, options=None, stop_hook=None,
 
102
                 fingerprint=None, secret=None, secfile=None, fqdn=None,
 
103
                 timeout=None, interval=-1, checker=None):
227
104
        self.name = name
228
 
        if config is None:
229
 
            config = {}
230
 
        logger.debug(u"Creating client %r", self.name)
231
 
        # Uppercase and remove spaces from fingerprint for later
232
 
        # comparison purposes with return value from the fingerprint()
233
 
        # function
234
 
        self.fingerprint = (config["fingerprint"].upper()
235
 
                            .replace(u" ", u""))
236
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
237
 
        if "secret" in config:
238
 
            self.secret = config["secret"].decode(u"base64")
239
 
        elif "secfile" in config:
240
 
            with closing(open(os.path.expanduser
241
 
                              (os.path.expandvars
242
 
                               (config["secfile"])))) as secfile:
243
 
                self.secret = secfile.read()
244
 
        else:
245
 
            raise TypeError(u"No secret or secfile for client %s"
246
 
                            % self.name)
247
 
        self.host = config.get("host", "")
248
 
        self.created = datetime.datetime.utcnow()
249
 
        self.enabled = False
250
 
        self.last_enabled = None
251
 
        self.last_checked_ok = None
252
 
        self.timeout = string_to_delta(config["timeout"])
253
 
        self.interval = string_to_delta(config["interval"])
254
 
        self.disable_hook = disable_hook
 
105
        # Uppercase and remove spaces from fingerprint
 
106
        # for later comparison purposes with return value of
 
107
        # the fingerprint() function
 
108
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
109
        if secret:
 
110
            self.secret = secret.decode(u"base64")
 
111
        elif secfile:
 
112
            sf = open(secfile)
 
113
            self.secret = sf.read()
 
114
            sf.close()
 
115
        else:
 
116
            raise RuntimeError(u"No secret or secfile for client %s"
 
117
                               % self.name)
 
118
        self.fqdn = fqdn                # string
 
119
        self.created = datetime.datetime.now()
 
120
        self.last_seen = None
 
121
        if timeout is None:
 
122
            timeout = options.timeout
 
123
        self.timeout = timeout
 
124
        if interval == -1:
 
125
            interval = options.interval
 
126
        else:
 
127
            interval = string_to_delta(interval)
 
128
        self.interval = interval
 
129
        self.stop_hook = stop_hook
255
130
        self.checker = None
256
131
        self.checker_initiator_tag = None
257
 
        self.disable_initiator_tag = None
 
132
        self.stop_initiator_tag = None
258
133
        self.checker_callback_tag = None
259
 
        self.checker_command = config["checker"]
260
 
        self.current_checker_command = None
261
 
        self.last_connect = None
262
 
    
263
 
    def enable(self):
264
 
        """Start this client's checker and timeout hooks"""
265
 
        self.last_enabled = datetime.datetime.utcnow()
 
134
        self.check_command = checker
 
135
    def start(self):
 
136
        """Start this clients checker and timeout hooks"""
266
137
        # Schedule a new checker to be started an 'interval' from now,
267
138
        # and every interval from then on.
268
 
        self.checker_initiator_tag = (gobject.timeout_add
269
 
                                      (self.interval_milliseconds(),
270
 
                                       self.start_checker))
 
139
        self.checker_initiator_tag = gobject.timeout_add\
 
140
                                     (self._interval_milliseconds,
 
141
                                      self.start_checker)
271
142
        # Also start a new checker *right now*.
272
143
        self.start_checker()
273
 
        # Schedule a disable() when 'timeout' has passed
274
 
        self.disable_initiator_tag = (gobject.timeout_add
275
 
                                   (self.timeout_milliseconds(),
276
 
                                    self.disable))
277
 
        self.enabled = True
278
 
    
279
 
    def disable(self):
280
 
        """Disable this client."""
281
 
        if not getattr(self, "enabled", False):
282
 
            return False
283
 
        logger.info(u"Disabling client %s", self.name)
284
 
        if getattr(self, "disable_initiator_tag", False):
285
 
            gobject.source_remove(self.disable_initiator_tag)
286
 
            self.disable_initiator_tag = None
287
 
        if getattr(self, "checker_initiator_tag", False):
 
144
        # Schedule a stop() when 'timeout' has passed
 
145
        self.stop_initiator_tag = gobject.timeout_add\
 
146
                                  (self._timeout_milliseconds,
 
147
                                   self.stop)
 
148
    def stop(self):
 
149
        """Stop this client.
 
150
        The possibility that this client might be restarted is left
 
151
        open, but not currently used."""
 
152
        if debug:
 
153
            sys.stderr.write(u"Stopping client %s\n" % self.name)
 
154
        self.secret = None
 
155
        if self.stop_initiator_tag:
 
156
            gobject.source_remove(self.stop_initiator_tag)
 
157
            self.stop_initiator_tag = None
 
158
        if self.checker_initiator_tag:
288
159
            gobject.source_remove(self.checker_initiator_tag)
289
160
            self.checker_initiator_tag = None
290
161
        self.stop_checker()
291
 
        if self.disable_hook:
292
 
            self.disable_hook(self)
293
 
        self.enabled = False
 
162
        if self.stop_hook:
 
163
            self.stop_hook(self)
294
164
        # Do not run this again if called by a gobject.timeout_add
295
165
        return False
296
 
    
297
166
    def __del__(self):
298
 
        self.disable_hook = None
299
 
        self.disable()
300
 
    
301
 
    def checker_callback(self, pid, condition, command):
 
167
        # Some code duplication here and in stop()
 
168
        if hasattr(self, "stop_initiator_tag") \
 
169
               and self.stop_initiator_tag:
 
170
            gobject.source_remove(self.stop_initiator_tag)
 
171
            self.stop_initiator_tag = None
 
172
        if hasattr(self, "checker_initiator_tag") \
 
173
               and self.checker_initiator_tag:
 
174
            gobject.source_remove(self.checker_initiator_tag)
 
175
            self.checker_initiator_tag = None
 
176
        self.stop_checker()
 
177
    def checker_callback(self, pid, condition):
302
178
        """The checker has completed, so take appropriate actions."""
 
179
        now = datetime.datetime.now()
 
180
        if os.WIFEXITED(condition) \
 
181
               and (os.WEXITSTATUS(condition) == 0):
 
182
            if debug:
 
183
                sys.stderr.write(u"Checker for %(name)s succeeded\n"
 
184
                                 % vars(self))
 
185
            self.last_seen = now
 
186
            gobject.source_remove(self.stop_initiator_tag)
 
187
            self.stop_initiator_tag = gobject.timeout_add\
 
188
                                      (self._timeout_milliseconds,
 
189
                                       self.stop)
 
190
        elif debug:
 
191
            if not os.WIFEXITED(condition):
 
192
                sys.stderr.write(u"Checker for %(name)s crashed?\n"
 
193
                                 % vars(self))
 
194
            else:
 
195
                sys.stderr.write(u"Checker for %(name)s failed\n"
 
196
                                 % vars(self))
 
197
        self.checker = None
303
198
        self.checker_callback_tag = None
304
 
        self.checker = None
305
 
        if os.WIFEXITED(condition):
306
 
            exitstatus = os.WEXITSTATUS(condition)
307
 
            if exitstatus == 0:
308
 
                logger.info(u"Checker for %(name)s succeeded",
309
 
                            vars(self))
310
 
                self.checked_ok()
311
 
            else:
312
 
                logger.info(u"Checker for %(name)s failed",
313
 
                            vars(self))
314
 
        else:
315
 
            logger.warning(u"Checker for %(name)s crashed?",
316
 
                           vars(self))
317
 
    
318
 
    def checked_ok(self):
319
 
        """Bump up the timeout for this client.
320
 
        This should only be called when the client has been seen,
321
 
        alive and well.
322
 
        """
323
 
        self.last_checked_ok = datetime.datetime.utcnow()
324
 
        gobject.source_remove(self.disable_initiator_tag)
325
 
        self.disable_initiator_tag = (gobject.timeout_add
326
 
                                      (self.timeout_milliseconds(),
327
 
                                       self.disable))
328
 
    
329
199
    def start_checker(self):
330
200
        """Start a new checker subprocess if one is not running.
331
201
        If a checker already exists, leave it running and do
332
202
        nothing."""
333
 
        # The reason for not killing a running checker is that if we
334
 
        # did that, then if a checker (for some reason) started
335
 
        # running slowly and taking more than 'interval' time, the
336
 
        # client would inevitably timeout, since no checker would get
337
 
        # a chance to run to completion.  If we instead leave running
338
 
        # checkers alone, the checker would have to take more time
339
 
        # than 'timeout' for the client to be declared invalid, which
340
 
        # is as it should be.
341
 
        
342
 
        # If a checker exists, make sure it is not a zombie
343
 
        if self.checker is not None:
344
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
345
 
            if pid:
346
 
                logger.warning("Checker was a zombie")
347
 
                gobject.source_remove(self.checker_callback_tag)
348
 
                self.checker_callback(pid, status,
349
 
                                      self.current_checker_command)
350
 
        # Start a new checker if needed
351
203
        if self.checker is None:
 
204
            if debug:
 
205
                sys.stderr.write(u"Starting checker for %s\n"
 
206
                                 % self.name)
352
207
            try:
353
 
                # In case checker_command has exactly one % operator
354
 
                command = self.checker_command % self.host
 
208
                command = self.check_command % self.fqdn
355
209
            except TypeError:
356
 
                # Escape attributes for the shell
357
210
                escaped_attrs = dict((key, re.escape(str(val)))
358
211
                                     for key, val in
359
212
                                     vars(self).iteritems())
360
 
                try:
361
 
                    command = self.checker_command % escaped_attrs
362
 
                except TypeError, error:
363
 
                    logger.error(u'Could not format string "%s":'
364
 
                                 u' %s', self.checker_command, error)
365
 
                    return True # Try again later
366
 
            self.current_checker_command = command
 
213
                command = self.check_command % escaped_attrs
367
214
            try:
368
 
                logger.info(u"Starting checker %r for %s",
369
 
                            command, self.name)
370
 
                # We don't need to redirect stdout and stderr, since
371
 
                # in normal mode, that is already done by daemon(),
372
 
                # and in debug mode we don't want to.  (Stdin is
373
 
                # always replaced by /dev/null.)
374
 
                self.checker = subprocess.Popen(command,
375
 
                                                close_fds=True,
376
 
                                                shell=True, cwd="/")
377
 
                self.checker_callback_tag = (gobject.child_watch_add
378
 
                                             (self.checker.pid,
379
 
                                              self.checker_callback,
380
 
                                              data=command))
381
 
                # The checker may have completed before the gobject
382
 
                # watch was added.  Check for this.
383
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
384
 
                if pid:
385
 
                    gobject.source_remove(self.checker_callback_tag)
386
 
                    self.checker_callback(pid, status, command)
387
 
            except OSError, error:
388
 
                logger.error(u"Failed to start subprocess: %s",
389
 
                             error)
 
215
                self.checker = subprocess.\
 
216
                               Popen(command,
 
217
                                     stdout=subprocess.PIPE,
 
218
                                     close_fds=True, shell=True,
 
219
                                     cwd="/")
 
220
                self.checker_callback_tag = gobject.\
 
221
                                            child_watch_add(self.checker.pid,
 
222
                                                            self.\
 
223
                                                            checker_callback)
 
224
            except subprocess.OSError, error:
 
225
                sys.stderr.write(u"Failed to start subprocess: %s\n"
 
226
                                 % error)
390
227
        # Re-run this periodically if run by gobject.timeout_add
391
228
        return True
392
 
    
393
229
    def stop_checker(self):
394
230
        """Force the checker process, if any, to stop."""
395
 
        if self.checker_callback_tag:
396
 
            gobject.source_remove(self.checker_callback_tag)
397
 
            self.checker_callback_tag = None
398
 
        if getattr(self, "checker", None) is None:
 
231
        if not hasattr(self, "checker") or self.checker is None:
399
232
            return
400
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
401
 
        try:
402
 
            os.kill(self.checker.pid, signal.SIGTERM)
403
 
            #os.sleep(0.5)
404
 
            #if self.checker.poll() is None:
405
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
406
 
        except OSError, error:
407
 
            if error.errno != errno.ESRCH: # No such process
408
 
                raise
 
233
        gobject.source_remove(self.checker_callback_tag)
 
234
        self.checker_callback_tag = None
 
235
        os.kill(self.checker.pid, signal.SIGTERM)
 
236
        if self.checker.poll() is None:
 
237
            os.kill(self.checker.pid, signal.SIGKILL)
409
238
        self.checker = None
410
 
    
411
 
    def still_valid(self):
 
239
    def still_valid(self, now=None):
412
240
        """Has the timeout not yet passed for this client?"""
413
 
        if not getattr(self, "enabled", False):
414
 
            return False
415
 
        now = datetime.datetime.utcnow()
416
 
        if self.last_checked_ok is None:
 
241
        if now is None:
 
242
            now = datetime.datetime.now()
 
243
        if self.last_seen is None:
417
244
            return now < (self.created + self.timeout)
418
245
        else:
419
 
            return now < (self.last_checked_ok + self.timeout)
420
 
 
421
 
 
422
 
class ClientDBus(Client, dbus.service.Object):
423
 
    """A Client class using D-Bus
424
 
    Attributes:
425
 
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
426
 
    """
427
 
    # dbus.service.Object doesn't use super(), so we can't either.
428
 
    
429
 
    def __init__(self, *args, **kwargs):
430
 
        Client.__init__(self, *args, **kwargs)
431
 
        # Only now, when this client is initialized, can it show up on
432
 
        # the D-Bus
433
 
        self.dbus_object_path = (dbus.ObjectPath
434
 
                                 ("/clients/"
435
 
                                  + self.name.replace(".", "_")))
436
 
        dbus.service.Object.__init__(self, bus,
437
 
                                     self.dbus_object_path)
438
 
    def enable(self):
439
 
        oldstate = getattr(self, "enabled", False)
440
 
        r = Client.enable(self)
441
 
        if oldstate != self.enabled:
442
 
            # Emit D-Bus signals
443
 
            self.PropertyChanged(dbus.String(u"enabled"),
444
 
                                 dbus.Boolean(True, variant_level=1))
445
 
            self.PropertyChanged(dbus.String(u"last_enabled"),
446
 
                                 (_datetime_to_dbus(self.last_enabled,
447
 
                                                    variant_level=1)))
448
 
        return r
449
 
    
450
 
    def disable(self, signal = True):
451
 
        oldstate = getattr(self, "enabled", False)
452
 
        r = Client.disable(self)
453
 
        if signal and oldstate != self.enabled:
454
 
            # Emit D-Bus signal
455
 
            self.PropertyChanged(dbus.String(u"enabled"),
456
 
                                 dbus.Boolean(False, variant_level=1))
457
 
        return r
458
 
    
459
 
    def __del__(self, *args, **kwargs):
460
 
        try:
461
 
            self.remove_from_connection()
462
 
        except org.freedesktop.DBus.Python.LookupError:
463
 
            pass
464
 
        dbus.service.Object.__del__(self, *args, **kwargs)
465
 
        Client.__del__(self, *args, **kwargs)
466
 
    
467
 
    def checker_callback(self, pid, condition, command,
468
 
                         *args, **kwargs):
469
 
        self.checker_callback_tag = None
470
 
        self.checker = None
471
 
        # Emit D-Bus signal
472
 
        self.PropertyChanged(dbus.String(u"checker_running"),
473
 
                             dbus.Boolean(False, variant_level=1))
474
 
        if os.WIFEXITED(condition):
475
 
            exitstatus = os.WEXITSTATUS(condition)
476
 
            # Emit D-Bus signal
477
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
478
 
                                  dbus.Int64(condition),
479
 
                                  dbus.String(command))
480
 
        else:
481
 
            # Emit D-Bus signal
482
 
            self.CheckerCompleted(dbus.Int16(-1),
483
 
                                  dbus.Int64(condition),
484
 
                                  dbus.String(command))
485
 
        
486
 
        return Client.checker_callback(self, pid, condition, command,
487
 
                                       *args, **kwargs)
488
 
    
489
 
    def checked_ok(self, *args, **kwargs):
490
 
        r = Client.checked_ok(self, *args, **kwargs)
491
 
        # Emit D-Bus signal
492
 
        self.PropertyChanged(
493
 
            dbus.String(u"last_checked_ok"),
494
 
            (_datetime_to_dbus(self.last_checked_ok,
495
 
                               variant_level=1)))
496
 
        return r
497
 
    
498
 
    def start_checker(self, *args, **kwargs):
499
 
        old_checker = self.checker
500
 
        if self.checker is not None:
501
 
            old_checker_pid = self.checker.pid
502
 
        else:
503
 
            old_checker_pid = None
504
 
        r = Client.start_checker(self, *args, **kwargs)
505
 
        # Only emit D-Bus signal if new checker process was started
506
 
        if ((self.checker is not None)
507
 
            and not (old_checker is not None
508
 
                     and old_checker_pid == self.checker.pid)):
509
 
            self.CheckerStarted(self.current_checker_command)
510
 
            self.PropertyChanged(
511
 
                dbus.String("checker_running"),
512
 
                dbus.Boolean(True, variant_level=1))
513
 
        return r
514
 
    
515
 
    def stop_checker(self, *args, **kwargs):
516
 
        old_checker = getattr(self, "checker", None)
517
 
        r = Client.stop_checker(self, *args, **kwargs)
518
 
        if (old_checker is not None
519
 
            and getattr(self, "checker", None) is None):
520
 
            self.PropertyChanged(dbus.String(u"checker_running"),
521
 
                                 dbus.Boolean(False, variant_level=1))
522
 
        return r
523
 
    
524
 
    ## D-Bus methods & signals
525
 
    _interface = u"se.bsnet.fukt.Mandos.Client"
526
 
    
527
 
    # CheckedOK - method
528
 
    CheckedOK = dbus.service.method(_interface)(checked_ok)
529
 
    CheckedOK.__name__ = "CheckedOK"
530
 
    
531
 
    # CheckerCompleted - signal
532
 
    @dbus.service.signal(_interface, signature="nxs")
533
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
534
 
        "D-Bus signal"
535
 
        pass
536
 
    
537
 
    # CheckerStarted - signal
538
 
    @dbus.service.signal(_interface, signature="s")
539
 
    def CheckerStarted(self, command):
540
 
        "D-Bus signal"
541
 
        pass
542
 
    
543
 
    # GetAllProperties - method
544
 
    @dbus.service.method(_interface, out_signature="a{sv}")
545
 
    def GetAllProperties(self):
546
 
        "D-Bus method"
547
 
        return dbus.Dictionary({
548
 
                dbus.String("name"):
549
 
                    dbus.String(self.name, variant_level=1),
550
 
                dbus.String("fingerprint"):
551
 
                    dbus.String(self.fingerprint, variant_level=1),
552
 
                dbus.String("host"):
553
 
                    dbus.String(self.host, variant_level=1),
554
 
                dbus.String("created"):
555
 
                    _datetime_to_dbus(self.created, variant_level=1),
556
 
                dbus.String("last_enabled"):
557
 
                    (_datetime_to_dbus(self.last_enabled,
558
 
                                       variant_level=1)
559
 
                     if self.last_enabled is not None
560
 
                     else dbus.Boolean(False, variant_level=1)),
561
 
                dbus.String("enabled"):
562
 
                    dbus.Boolean(self.enabled, variant_level=1),
563
 
                dbus.String("last_checked_ok"):
564
 
                    (_datetime_to_dbus(self.last_checked_ok,
565
 
                                       variant_level=1)
566
 
                     if self.last_checked_ok is not None
567
 
                     else dbus.Boolean (False, variant_level=1)),
568
 
                dbus.String("timeout"):
569
 
                    dbus.UInt64(self.timeout_milliseconds(),
570
 
                                variant_level=1),
571
 
                dbus.String("interval"):
572
 
                    dbus.UInt64(self.interval_milliseconds(),
573
 
                                variant_level=1),
574
 
                dbus.String("checker"):
575
 
                    dbus.String(self.checker_command,
576
 
                                variant_level=1),
577
 
                dbus.String("checker_running"):
578
 
                    dbus.Boolean(self.checker is not None,
579
 
                                 variant_level=1),
580
 
                dbus.String("object_path"):
581
 
                    dbus.ObjectPath(self.dbus_object_path,
582
 
                                    variant_level=1)
583
 
                }, signature="sv")
584
 
    
585
 
    # IsStillValid - method
586
 
    @dbus.service.method(_interface, out_signature="b")
587
 
    def IsStillValid(self):
588
 
        return self.still_valid()
589
 
    
590
 
    # PropertyChanged - signal
591
 
    @dbus.service.signal(_interface, signature="sv")
592
 
    def PropertyChanged(self, property, value):
593
 
        "D-Bus signal"
594
 
        pass
595
 
    
596
 
    # ReceivedSecret - signal
597
 
    @dbus.service.signal(_interface)
598
 
    def ReceivedSecret(self):
599
 
        "D-Bus signal"
600
 
        pass
601
 
    
602
 
    # Rejected - signal
603
 
    @dbus.service.signal(_interface)
604
 
    def Rejected(self):
605
 
        "D-Bus signal"
606
 
        pass
607
 
    
608
 
    # SetChecker - method
609
 
    @dbus.service.method(_interface, in_signature="s")
610
 
    def SetChecker(self, checker):
611
 
        "D-Bus setter method"
612
 
        self.checker_command = checker
613
 
        # Emit D-Bus signal
614
 
        self.PropertyChanged(dbus.String(u"checker"),
615
 
                             dbus.String(self.checker_command,
616
 
                                         variant_level=1))
617
 
    
618
 
    # SetHost - method
619
 
    @dbus.service.method(_interface, in_signature="s")
620
 
    def SetHost(self, host):
621
 
        "D-Bus setter method"
622
 
        self.host = host
623
 
        # Emit D-Bus signal
624
 
        self.PropertyChanged(dbus.String(u"host"),
625
 
                             dbus.String(self.host, variant_level=1))
626
 
    
627
 
    # SetInterval - method
628
 
    @dbus.service.method(_interface, in_signature="t")
629
 
    def SetInterval(self, milliseconds):
630
 
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
631
 
        # Emit D-Bus signal
632
 
        self.PropertyChanged(dbus.String(u"interval"),
633
 
                             (dbus.UInt64(self.interval_milliseconds(),
634
 
                                          variant_level=1)))
635
 
    
636
 
    # SetSecret - method
637
 
    @dbus.service.method(_interface, in_signature="ay",
638
 
                         byte_arrays=True)
639
 
    def SetSecret(self, secret):
640
 
        "D-Bus setter method"
641
 
        self.secret = str(secret)
642
 
    
643
 
    # SetTimeout - method
644
 
    @dbus.service.method(_interface, in_signature="t")
645
 
    def SetTimeout(self, milliseconds):
646
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
647
 
        # Emit D-Bus signal
648
 
        self.PropertyChanged(dbus.String(u"timeout"),
649
 
                             (dbus.UInt64(self.timeout_milliseconds(),
650
 
                                          variant_level=1)))
651
 
    
652
 
    # Enable - method
653
 
    Enable = dbus.service.method(_interface)(enable)
654
 
    Enable.__name__ = "Enable"
655
 
    
656
 
    # StartChecker - method
657
 
    @dbus.service.method(_interface)
658
 
    def StartChecker(self):
659
 
        "D-Bus method"
660
 
        self.start_checker()
661
 
    
662
 
    # Disable - method
663
 
    @dbus.service.method(_interface)
664
 
    def Disable(self):
665
 
        "D-Bus method"
666
 
        self.disable()
667
 
    
668
 
    # StopChecker - method
669
 
    StopChecker = dbus.service.method(_interface)(stop_checker)
670
 
    StopChecker.__name__ = "StopChecker"
671
 
    
672
 
    del _interface
 
246
            return now < (self.last_seen + self.timeout)
673
247
 
674
248
 
675
249
def peer_certificate(session):
676
 
    "Return the peer's OpenPGP certificate as a bytestring"
677
250
    # If not an OpenPGP certificate...
678
 
    if (gnutls.library.functions
679
 
        .gnutls_certificate_type_get(session._c_object)
680
 
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
251
    if gnutls.library.functions.gnutls_certificate_type_get\
 
252
            (session._c_object) \
 
253
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
681
254
        # ...do the normal thing
682
255
        return session.peer_certificate
683
 
    list_size = ctypes.c_uint(1)
684
 
    cert_list = (gnutls.library.functions
685
 
                 .gnutls_certificate_get_peers
686
 
                 (session._c_object, ctypes.byref(list_size)))
687
 
    if not bool(cert_list) and list_size.value != 0:
688
 
        raise gnutls.errors.GNUTLSError("error getting peer"
689
 
                                        " certificate")
 
256
    list_size = ctypes.c_uint()
 
257
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
258
        (session._c_object, ctypes.byref(list_size))
690
259
    if list_size.value == 0:
691
260
        return None
692
261
    cert = cert_list[0]
694
263
 
695
264
 
696
265
def fingerprint(openpgp):
697
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
698
 
    # New GnuTLS "datum" with the OpenPGP public key
699
 
    datum = (gnutls.library.types
700
 
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
701
 
                                         ctypes.POINTER
702
 
                                         (ctypes.c_ubyte)),
703
 
                             ctypes.c_uint(len(openpgp))))
704
266
    # New empty GnuTLS certificate
705
267
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
706
 
    (gnutls.library.functions
707
 
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
268
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
269
        (ctypes.byref(crt))
 
270
    # New GnuTLS "datum" with the OpenPGP public key
 
271
    datum = gnutls.library.types.gnutls_datum_t\
 
272
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
273
                     ctypes.POINTER(ctypes.c_ubyte)),
 
274
         ctypes.c_uint(len(openpgp)))
708
275
    # Import the OpenPGP public key into the certificate
709
 
    (gnutls.library.functions
710
 
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
711
 
                                gnutls.library.constants
712
 
                                .GNUTLS_OPENPGP_FMT_RAW))
713
 
    # Verify the self signature in the key
714
 
    crtverify = ctypes.c_uint()
715
 
    (gnutls.library.functions
716
 
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
717
 
    if crtverify.value != 0:
718
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
719
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
276
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
277
        (crt,
 
278
         ctypes.byref(datum),
 
279
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
720
280
    # New buffer for the fingerprint
721
 
    buf = ctypes.create_string_buffer(20)
722
 
    buf_len = ctypes.c_size_t()
 
281
    buffer = ctypes.create_string_buffer(20)
 
282
    buffer_length = ctypes.c_size_t()
723
283
    # Get the fingerprint from the certificate into the buffer
724
 
    (gnutls.library.functions
725
 
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
726
 
                                         ctypes.byref(buf_len)))
 
284
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
285
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
727
286
    # Deinit the certificate
728
287
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
729
288
    # Convert the buffer to a Python bytestring
730
 
    fpr = ctypes.string_at(buf, buf_len.value)
 
289
    fpr = ctypes.string_at(buffer, buffer_length.value)
731
290
    # Convert the bytestring to hexadecimal notation
732
291
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
733
292
    return hex_fpr
734
293
 
735
294
 
736
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
295
class tcp_handler(SocketServer.BaseRequestHandler, object):
737
296
    """A TCP request handler class.
738
297
    Instantiated by IPv6_TCPServer for each request to handle it.
739
298
    Note: This will run in its own forked process."""
740
299
    
741
300
    def handle(self):
742
 
        logger.info(u"TCP connection from: %s",
743
 
                    unicode(self.client_address))
744
 
        logger.debug(u"IPC Pipe FD: %d", self.server.pipe[1])
745
 
        # Open IPC pipe to parent process
746
 
        with closing(os.fdopen(self.server.pipe[1], "w", 1)) as ipc:
747
 
            session = (gnutls.connection
748
 
                       .ClientSession(self.request,
749
 
                                      gnutls.connection
750
 
                                      .X509Credentials()))
751
 
            
752
 
            line = self.request.makefile().readline()
753
 
            logger.debug(u"Protocol version: %r", line)
754
 
            try:
755
 
                if int(line.strip().split()[0]) > 1:
756
 
                    raise RuntimeError
757
 
            except (ValueError, IndexError, RuntimeError), error:
758
 
                logger.error(u"Unknown protocol version: %s", error)
759
 
                return
760
 
            
761
 
            # Note: gnutls.connection.X509Credentials is really a
762
 
            # generic GnuTLS certificate credentials object so long as
763
 
            # no X.509 keys are added to it.  Therefore, we can use it
764
 
            # here despite using OpenPGP certificates.
765
 
            
766
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
767
 
            #                     "+AES-256-CBC", "+SHA1",
768
 
            #                     "+COMP-NULL", "+CTYPE-OPENPGP",
769
 
            #                     "+DHE-DSS"))
770
 
            # Use a fallback default, since this MUST be set.
771
 
            priority = self.server.settings.get("priority", "NORMAL")
772
 
            (gnutls.library.functions
773
 
             .gnutls_priority_set_direct(session._c_object,
774
 
                                         priority, None))
775
 
            
776
 
            try:
777
 
                session.handshake()
778
 
            except gnutls.errors.GNUTLSError, error:
779
 
                logger.warning(u"Handshake failed: %s", error)
780
 
                # Do not run session.bye() here: the session is not
781
 
                # established.  Just abandon the request.
782
 
                return
783
 
            logger.debug(u"Handshake succeeded")
784
 
            try:
785
 
                fpr = fingerprint(peer_certificate(session))
786
 
            except (TypeError, gnutls.errors.GNUTLSError), error:
787
 
                logger.warning(u"Bad certificate: %s", error)
788
 
                session.bye()
789
 
                return
790
 
            logger.debug(u"Fingerprint: %s", fpr)
791
 
            
792
 
            for c in self.server.clients:
793
 
                if c.fingerprint == fpr:
794
 
                    client = c
795
 
                    break
796
 
            else:
797
 
                logger.warning(u"Client not found for fingerprint: %s",
798
 
                               fpr)
799
 
                ipc.write("NOTFOUND %s\n" % fpr)
800
 
                session.bye()
801
 
                return
802
 
            # Have to check if client.still_valid(), since it is
803
 
            # possible that the client timed out while establishing
804
 
            # the GnuTLS session.
805
 
            if not client.still_valid():
806
 
                logger.warning(u"Client %(name)s is invalid",
807
 
                               vars(client))
808
 
                ipc.write("INVALID %s\n" % client.name)
809
 
                session.bye()
810
 
                return
811
 
            ipc.write("SENDING %s\n" % client.name)
812
 
            sent_size = 0
813
 
            while sent_size < len(client.secret):
814
 
                sent = session.send(client.secret[sent_size:])
815
 
                logger.debug(u"Sent: %d, remaining: %d",
816
 
                             sent, len(client.secret)
817
 
                             - (sent_size + sent))
818
 
                sent_size += sent
819
 
            session.bye()
820
 
 
821
 
 
822
 
class ForkingMixInWithPipe(SocketServer.ForkingMixIn, object):
823
 
    """Like SocketServer.ForkingMixIn, but also pass a pipe.
824
 
    Assumes a gobject.MainLoop event loop.
825
 
    """
826
 
    def process_request(self, request, client_address):
827
 
        """This overrides and wraps the original process_request().
828
 
        This function creates a new pipe in self.pipe 
829
 
        """
830
 
        self.pipe = os.pipe()
831
 
        super(ForkingMixInWithPipe,
832
 
              self).process_request(request, client_address)
833
 
        os.close(self.pipe[1])  # close write end
834
 
        # Call "handle_ipc" for both data and EOF events
835
 
        gobject.io_add_watch(self.pipe[0],
836
 
                             gobject.IO_IN | gobject.IO_HUP,
837
 
                             self.handle_ipc)
838
 
    def handle_ipc(source, condition):
839
 
        """Dummy function; override as necessary"""
840
 
        os.close(source)
841
 
        return False
842
 
 
843
 
 
844
 
class IPv6_TCPServer(ForkingMixInWithPipe,
845
 
                     SocketServer.TCPServer, object):
846
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
301
        if debug:
 
302
            sys.stderr.write(u"TCP request came\n")
 
303
            sys.stderr.write(u"Request: %s\n" % self.request)
 
304
            sys.stderr.write(u"Client Address: %s\n"
 
305
                             % unicode(self.client_address))
 
306
            sys.stderr.write(u"Server: %s\n" % self.server)
 
307
        session = gnutls.connection.ClientSession(self.request,
 
308
                                                  gnutls.connection.\
 
309
                                                  X509Credentials())
 
310
        
 
311
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
312
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
313
        #                "+DHE-DSS"))
 
314
        priority = "SECURE256"
 
315
        
 
316
        gnutls.library.functions.gnutls_priority_set_direct\
 
317
            (session._c_object, priority, None);
 
318
        
 
319
        try:
 
320
            session.handshake()
 
321
        except gnutls.errors.GNUTLSError, error:
 
322
            if debug:
 
323
                sys.stderr.write(u"Handshake failed: %s\n" % error)
 
324
            # Do not run session.bye() here: the session is not
 
325
            # established.  Just abandon the request.
 
326
            return
 
327
        try:
 
328
            fpr = fingerprint(peer_certificate(session))
 
329
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
330
            if debug:
 
331
                sys.stderr.write(u"Bad certificate: %s\n" % error)
 
332
            session.bye()
 
333
            return
 
334
        if debug:
 
335
            sys.stderr.write(u"Fingerprint: %s\n" % fpr)
 
336
        client = None
 
337
        for c in clients:
 
338
            if c.fingerprint == fpr:
 
339
                client = c
 
340
                break
 
341
        # Have to check if client.still_valid(), since it is possible
 
342
        # that the client timed out while establishing the GnuTLS
 
343
        # session.
 
344
        if (not client) or (not client.still_valid()):
 
345
            if debug:
 
346
                if client:
 
347
                    sys.stderr.write(u"Client %(name)s is invalid\n"
 
348
                                     % vars(client))
 
349
                else:
 
350
                    sys.stderr.write(u"Client not found for "
 
351
                                     u"fingerprint: %s\n" % fpr)
 
352
            session.bye()
 
353
            return
 
354
        sent_size = 0
 
355
        while sent_size < len(client.secret):
 
356
            sent = session.send(client.secret[sent_size:])
 
357
            if debug:
 
358
                sys.stderr.write(u"Sent: %d, remaining: %d\n"
 
359
                                 % (sent, len(client.secret)
 
360
                                    - (sent_size + sent)))
 
361
            sent_size += sent
 
362
        session.bye()
 
363
 
 
364
 
 
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
366
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
847
367
    Attributes:
848
 
        settings:       Server settings
 
368
        options:        Command line options
849
369
        clients:        Set() of Client objects
850
 
        enabled:        Boolean; whether this server is activated yet
851
370
    """
852
371
    address_family = socket.AF_INET6
853
372
    def __init__(self, *args, **kwargs):
854
 
        if "settings" in kwargs:
855
 
            self.settings = kwargs["settings"]
856
 
            del kwargs["settings"]
 
373
        if "options" in kwargs:
 
374
            self.options = kwargs["options"]
 
375
            del kwargs["options"]
857
376
        if "clients" in kwargs:
858
377
            self.clients = kwargs["clients"]
859
378
            del kwargs["clients"]
860
 
        if "use_ipv6" in kwargs:
861
 
            if not kwargs["use_ipv6"]:
862
 
                self.address_family = socket.AF_INET
863
 
            del kwargs["use_ipv6"]
864
 
        self.enabled = False
865
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
379
        return super(type(self), self).__init__(*args, **kwargs)
866
380
    def server_bind(self):
867
381
        """This overrides the normal server_bind() function
868
382
        to bind to an interface if one was specified, and also NOT to
869
383
        bind to an address or port if they were not specified."""
870
 
        if self.settings["interface"]:
871
 
            # 25 is from /usr/include/asm-i486/socket.h
872
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
384
        if self.options.interface:
 
385
            if not hasattr(socket, "SO_BINDTODEVICE"):
 
386
                # From /usr/include/asm-i486/socket.h
 
387
                socket.SO_BINDTODEVICE = 25
873
388
            try:
874
389
                self.socket.setsockopt(socket.SOL_SOCKET,
875
 
                                       SO_BINDTODEVICE,
876
 
                                       self.settings["interface"])
 
390
                                       socket.SO_BINDTODEVICE,
 
391
                                       self.options.interface)
877
392
            except socket.error, error:
878
393
                if error[0] == errno.EPERM:
879
 
                    logger.error(u"No permission to"
880
 
                                 u" bind to interface %s",
881
 
                                 self.settings["interface"])
 
394
                    sys.stderr.write(u"Warning: No permission to" \
 
395
                                     u" bind to interface %s\n"
 
396
                                     % self.options.interface)
882
397
                else:
883
 
                    raise
 
398
                    raise error
884
399
        # Only bind(2) the socket if we really need to.
885
400
        if self.server_address[0] or self.server_address[1]:
886
401
            if not self.server_address[0]:
887
 
                if self.address_family == socket.AF_INET6:
888
 
                    any_address = "::" # in6addr_any
889
 
                else:
890
 
                    any_address = socket.INADDR_ANY
891
 
                self.server_address = (any_address,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
892
404
                                       self.server_address[1])
893
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
894
406
                self.server_address = (self.server_address[0],
895
407
                                       0)
896
 
#                 if self.settings["interface"]:
897
 
#                     self.server_address = (self.server_address[0],
898
 
#                                            0, # port
899
 
#                                            0, # flowinfo
900
 
#                                            if_nametoindex
901
 
#                                            (self.settings
902
 
#                                             ["interface"]))
903
 
            return super(IPv6_TCPServer, self).server_bind()
904
 
    def server_activate(self):
905
 
        if self.enabled:
906
 
            return super(IPv6_TCPServer, self).server_activate()
907
 
    def enable(self):
908
 
        self.enabled = True
909
 
    def handle_ipc(self, source, condition, file_objects={}):
910
 
        condition_names = {
911
 
            gobject.IO_IN: "IN", # There is data to read.
912
 
            gobject.IO_OUT: "OUT", # Data can be written (without
913
 
                                   # blocking).
914
 
            gobject.IO_PRI: "PRI", # There is urgent data to read.
915
 
            gobject.IO_ERR: "ERR", # Error condition.
916
 
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
917
 
                                   # broken, usually for pipes and
918
 
                                   # sockets).
919
 
            }
920
 
        conditions_string = ' | '.join(name
921
 
                                       for cond, name in
922
 
                                       condition_names.iteritems()
923
 
                                       if cond & condition)
924
 
        logger.debug("Handling IPC: FD = %d, condition = %s", source,
925
 
                     conditions_string)
926
 
        
927
 
        # Turn the pipe file descriptor into a Python file object
928
 
        if source not in file_objects:
929
 
            file_objects[source] = os.fdopen(source, "r", 1)
930
 
        
931
 
        # Read a line from the file object
932
 
        cmdline = file_objects[source].readline()
933
 
        if not cmdline:             # Empty line means end of file
934
 
            # close the IPC pipe
935
 
            file_objects[source].close()
936
 
            del file_objects[source]
937
 
            
938
 
            # Stop calling this function
939
 
            return False
940
 
        
941
 
        logger.debug("IPC command: %r\n" % cmdline)
942
 
        
943
 
        # Parse and act on command
944
 
        cmd, args = cmdline.split(None, 1)
945
 
        if cmd == "NOTFOUND":
946
 
            if self.settings["use_dbus"]:
947
 
                # Emit D-Bus signal
948
 
                mandos_dbus_service.ClientNotFound(args)
949
 
        elif cmd == "INVALID":
950
 
            if self.settings["use_dbus"]:
951
 
                for client in self.clients:
952
 
                    if client.name == args:
953
 
                        # Emit D-Bus signal
954
 
                        client.Rejected()
955
 
                        break
956
 
        elif cmd == "SENDING":
957
 
            for client in self.clients:
958
 
                if client.name == args:
959
 
                    client.checked_ok()
960
 
                    if self.settings["use_dbus"]:
961
 
                        # Emit D-Bus signal
962
 
                        client.ReceivedSecret()
963
 
                    break
964
 
        else:
965
 
            logger.error("Unknown IPC command: %r", cmdline)
966
 
        
967
 
        # Keep calling this function
968
 
        return True
 
408
            return super(type(self), self).server_bind()
969
409
 
970
410
 
971
411
def string_to_delta(interval):
972
412
    """Parse a string and return a datetime.timedelta
973
 
    
 
413
 
974
414
    >>> string_to_delta('7d')
975
415
    datetime.timedelta(7)
976
416
    >>> string_to_delta('60s')
981
421
    datetime.timedelta(1)
982
422
    >>> string_to_delta(u'1w')
983
423
    datetime.timedelta(7)
984
 
    >>> string_to_delta('5m 30s')
985
 
    datetime.timedelta(0, 330)
986
424
    """
987
 
    timevalue = datetime.timedelta(0)
988
 
    for s in interval.split():
989
 
        try:
990
 
            suffix = unicode(s[-1])
991
 
            value = int(s[:-1])
992
 
            if suffix == u"d":
993
 
                delta = datetime.timedelta(value)
994
 
            elif suffix == u"s":
995
 
                delta = datetime.timedelta(0, value)
996
 
            elif suffix == u"m":
997
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
998
 
            elif suffix == u"h":
999
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1000
 
            elif suffix == u"w":
1001
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1002
 
            else:
1003
 
                raise ValueError
1004
 
        except (ValueError, IndexError):
 
425
    try:
 
426
        suffix=unicode(interval[-1])
 
427
        value=int(interval[:-1])
 
428
        if suffix == u"d":
 
429
            delta = datetime.timedelta(value)
 
430
        elif suffix == u"s":
 
431
            delta = datetime.timedelta(0, value)
 
432
        elif suffix == u"m":
 
433
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
434
        elif suffix == u"h":
 
435
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
436
        elif suffix == u"w":
 
437
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
438
        else:
1005
439
            raise ValueError
1006
 
        timevalue += delta
1007
 
    return timevalue
 
440
    except (ValueError, IndexError):
 
441
        raise ValueError
 
442
    return delta
 
443
 
 
444
 
 
445
def add_service():
 
446
    """From the Avahi server example code"""
 
447
    global group, serviceName, serviceType, servicePort, serviceTXT, \
 
448
           domain, host
 
449
    if group is None:
 
450
        group = dbus.Interface(
 
451
                bus.get_object( avahi.DBUS_NAME,
 
452
                                server.EntryGroupNew()),
 
453
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
454
        group.connect_to_signal('StateChanged',
 
455
                                entry_group_state_changed)
 
456
    if debug:
 
457
        sys.stderr.write(u"Adding service '%s' of type '%s' ...\n"
 
458
                         % (serviceName, serviceType))
 
459
    
 
460
    group.AddService(
 
461
            serviceInterface,           # interface
 
462
            avahi.PROTO_INET6,          # protocol
 
463
            dbus.UInt32(0),             # flags
 
464
            serviceName, serviceType,
 
465
            domain, host,
 
466
            dbus.UInt16(servicePort),
 
467
            avahi.string_array_to_txt_array(serviceTXT))
 
468
    group.Commit()
 
469
 
 
470
 
 
471
def remove_service():
 
472
    """From the Avahi server example code"""
 
473
    global group
 
474
    
 
475
    if not group is None:
 
476
        group.Reset()
1008
477
 
1009
478
 
1010
479
def server_state_changed(state):
1011
 
    """Derived from the Avahi example code"""
 
480
    """From the Avahi server example code"""
1012
481
    if state == avahi.SERVER_COLLISION:
1013
 
        logger.error(u"Zeroconf server name collision")
1014
 
        service.remove()
 
482
        sys.stderr.write(u"WARNING: Server name collision\n")
 
483
        remove_service()
1015
484
    elif state == avahi.SERVER_RUNNING:
1016
 
        service.add()
 
485
        add_service()
1017
486
 
1018
487
 
1019
488
def entry_group_state_changed(state, error):
1020
 
    """Derived from the Avahi example code"""
1021
 
    logger.debug(u"Avahi state change: %i", state)
 
489
    """From the Avahi server example code"""
 
490
    global serviceName, server, rename_count
 
491
    
 
492
    if debug:
 
493
        sys.stderr.write(u"state change: %i\n" % state)
1022
494
    
1023
495
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
1024
 
        logger.debug(u"Zeroconf service established.")
 
496
        if debug:
 
497
            sys.stderr.write(u"Service established.\n")
1025
498
    elif state == avahi.ENTRY_GROUP_COLLISION:
1026
 
        logger.warning(u"Zeroconf service name collision.")
1027
 
        service.rename()
 
499
        
 
500
        rename_count = rename_count - 1
 
501
        if rename_count > 0:
 
502
            name = server.GetAlternativeServiceName(name)
 
503
            sys.stderr.write(u"WARNING: Service name collision, "
 
504
                             u"changing name to '%s' ...\n" % name)
 
505
            remove_service()
 
506
            add_service()
 
507
            
 
508
        else:
 
509
            sys.stderr.write(u"ERROR: No suitable service name found "
 
510
                             u"after %i retries, exiting.\n"
 
511
                             % n_rename)
 
512
            main_loop.quit()
1028
513
    elif state == avahi.ENTRY_GROUP_FAILURE:
1029
 
        logger.critical(u"Avahi: Error in group state changed %s",
1030
 
                        unicode(error))
1031
 
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
 
514
        sys.stderr.write(u"Error in group state changed %s\n"
 
515
                         % unicode(error))
 
516
        main_loop.quit()
 
517
        return
 
518
 
1032
519
 
1033
520
def if_nametoindex(interface):
1034
 
    """Call the C function if_nametoindex(), or equivalent"""
1035
 
    global if_nametoindex
 
521
    """Call the C function if_nametoindex()"""
1036
522
    try:
1037
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1038
 
                          (ctypes.util.find_library("c"))
1039
 
                          .if_nametoindex)
 
523
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
524
        return libc.if_nametoindex(interface)
1040
525
    except (OSError, AttributeError):
1041
526
        if "struct" not in sys.modules:
1042
527
            import struct
1043
528
        if "fcntl" not in sys.modules:
1044
529
            import fcntl
1045
 
        def if_nametoindex(interface):
1046
 
            "Get an interface index the hard way, i.e. using fcntl()"
1047
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
1048
 
            with closing(socket.socket()) as s:
1049
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1050
 
                                    struct.pack("16s16x", interface))
1051
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
1052
 
            return interface_index
1053
 
    return if_nametoindex(interface)
1054
 
 
1055
 
 
1056
 
def daemon(nochdir = False, noclose = False):
1057
 
    """See daemon(3).  Standard BSD Unix function.
1058
 
    This should really exist as os.daemon, but it doesn't (yet)."""
1059
 
    if os.fork():
1060
 
        sys.exit()
1061
 
    os.setsid()
1062
 
    if not nochdir:
1063
 
        os.chdir("/")
1064
 
    if os.fork():
1065
 
        sys.exit()
1066
 
    if not noclose:
1067
 
        # Close all standard open file descriptors
1068
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1069
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1070
 
            raise OSError(errno.ENODEV,
1071
 
                          "/dev/null not a character device")
1072
 
        os.dup2(null, sys.stdin.fileno())
1073
 
        os.dup2(null, sys.stdout.fileno())
1074
 
        os.dup2(null, sys.stderr.fileno())
1075
 
        if null > 2:
1076
 
            os.close(null)
1077
 
 
1078
 
 
1079
 
def main():
1080
 
    
1081
 
    ######################################################################
1082
 
    # Parsing of options, both command line and config file
1083
 
    
1084
 
    parser = optparse.OptionParser(version = "%%prog %s" % version)
 
530
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
531
        s = socket.socket()
 
532
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
533
                            struct.pack("16s16x", interface))
 
534
        s.close()
 
535
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
536
        return interface_index
 
537
 
 
538
 
 
539
if __name__ == '__main__':
 
540
    parser = OptionParser()
1085
541
    parser.add_option("-i", "--interface", type="string",
1086
 
                      metavar="IF", help="Bind to interface IF")
1087
 
    parser.add_option("-a", "--address", type="string",
1088
 
                      help="Address to listen for requests on")
1089
 
    parser.add_option("-p", "--port", type="int",
 
542
                      default=None, metavar="IF",
 
543
                      help="Bind to interface IF")
 
544
    parser.add_option("--cert", type="string", default="cert.pem",
 
545
                      metavar="FILE",
 
546
                      help="Public key certificate PEM file to use")
 
547
    parser.add_option("--key", type="string", default="key.pem",
 
548
                      metavar="FILE",
 
549
                      help="Private key PEM file to use")
 
550
    parser.add_option("--ca", type="string", default="ca.pem",
 
551
                      metavar="FILE",
 
552
                      help="Certificate Authority certificate PEM file to use")
 
553
    parser.add_option("--crl", type="string", default="crl.pem",
 
554
                      metavar="FILE",
 
555
                      help="Certificate Revokation List PEM file to use")
 
556
    parser.add_option("-p", "--port", type="int", default=None,
1090
557
                      help="Port number to receive requests on")
1091
 
    parser.add_option("--check", action="store_true",
 
558
    parser.add_option("--timeout", type="string", # Parsed later
 
559
                      default="1h",
 
560
                      help="Amount of downtime allowed for clients")
 
561
    parser.add_option("--interval", type="string", # Parsed later
 
562
                      default="5m",
 
563
                      help="How often to check that a client is up")
 
564
    parser.add_option("--check", action="store_true", default=False,
1092
565
                      help="Run self-test")
1093
 
    parser.add_option("--debug", action="store_true",
1094
 
                      help="Debug mode; run in foreground and log to"
1095
 
                      " terminal")
1096
 
    parser.add_option("--priority", type="string", help="GnuTLS"
1097
 
                      " priority string (see GnuTLS documentation)")
1098
 
    parser.add_option("--servicename", type="string", metavar="NAME",
1099
 
                      help="Zeroconf service name")
1100
 
    parser.add_option("--configdir", type="string",
1101
 
                      default="/etc/mandos", metavar="DIR",
1102
 
                      help="Directory to search for configuration"
1103
 
                      " files")
1104
 
    parser.add_option("--no-dbus", action="store_false",
1105
 
                      dest="use_dbus",
1106
 
                      help="Do not provide D-Bus system bus"
1107
 
                      " interface")
1108
 
    parser.add_option("--no-ipv6", action="store_false",
1109
 
                      dest="use_ipv6", help="Do not use IPv6")
1110
 
    options = parser.parse_args()[0]
 
566
    parser.add_option("--debug", action="store_true", default=False,
 
567
                      help="Debug mode")
 
568
    (options, args) = parser.parse_args()
1111
569
    
1112
570
    if options.check:
1113
571
        import doctest
1114
572
        doctest.testmod()
1115
573
        sys.exit()
1116
574
    
1117
 
    # Default values for config file for server-global settings
1118
 
    server_defaults = { "interface": "",
1119
 
                        "address": "",
1120
 
                        "port": "",
1121
 
                        "debug": "False",
1122
 
                        "priority":
1123
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1124
 
                        "servicename": "Mandos",
1125
 
                        "use_dbus": "True",
1126
 
                        "use_ipv6": "True",
1127
 
                        }
1128
 
    
1129
 
    # Parse config file for server-global settings
1130
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
1131
 
    del server_defaults
1132
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
1133
 
    # Convert the SafeConfigParser object to a dict
1134
 
    server_settings = server_config.defaults()
1135
 
    # Use the appropriate methods on the non-string config options
1136
 
    server_settings["debug"] = server_config.getboolean("DEFAULT",
1137
 
                                                        "debug")
1138
 
    server_settings["use_dbus"] = server_config.getboolean("DEFAULT",
1139
 
                                                           "use_dbus")
1140
 
    server_settings["use_ipv6"] = server_config.getboolean("DEFAULT",
1141
 
                                                           "use_ipv6")
1142
 
    if server_settings["port"]:
1143
 
        server_settings["port"] = server_config.getint("DEFAULT",
1144
 
                                                       "port")
1145
 
    del server_config
1146
 
    
1147
 
    # Override the settings from the config file with command line
1148
 
    # options, if set.
1149
 
    for option in ("interface", "address", "port", "debug",
1150
 
                   "priority", "servicename", "configdir",
1151
 
                   "use_dbus", "use_ipv6"):
1152
 
        value = getattr(options, option)
1153
 
        if value is not None:
1154
 
            server_settings[option] = value
1155
 
    del options
1156
 
    # Now we have our good server settings in "server_settings"
1157
 
    
1158
 
    ##################################################################
1159
 
    
1160
 
    # For convenience
1161
 
    debug = server_settings["debug"]
1162
 
    use_dbus = server_settings["use_dbus"]
1163
 
    use_ipv6 = server_settings["use_ipv6"]
1164
 
    
1165
 
    if not debug:
1166
 
        syslogger.setLevel(logging.WARNING)
1167
 
        console.setLevel(logging.WARNING)
1168
 
    
1169
 
    if server_settings["servicename"] != "Mandos":
1170
 
        syslogger.setFormatter(logging.Formatter
1171
 
                               ('Mandos (%s) [%%(process)d]:'
1172
 
                                ' %%(levelname)s: %%(message)s'
1173
 
                                % server_settings["servicename"]))
1174
 
    
1175
 
    # Parse config file with clients
1176
 
    client_defaults = { "timeout": "1h",
1177
 
                        "interval": "5m",
1178
 
                        "checker": "fping -q -- %%(host)s",
1179
 
                        "host": "",
1180
 
                        }
1181
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
1182
 
    client_config.read(os.path.join(server_settings["configdir"],
1183
 
                                    "clients.conf"))
1184
 
 
1185
 
    global mandos_dbus_service
1186
 
    mandos_dbus_service = None
1187
 
    
1188
 
    clients = Set()
1189
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
1190
 
                                 server_settings["port"]),
1191
 
                                TCP_handler,
1192
 
                                settings=server_settings,
1193
 
                                clients=clients, use_ipv6=use_ipv6)
1194
 
    pidfilename = "/var/run/mandos.pid"
1195
 
    try:
1196
 
        pidfile = open(pidfilename, "w")
1197
 
    except IOError:
1198
 
        logger.error("Could not open file %r", pidfilename)
1199
 
    
1200
 
    try:
1201
 
        uid = pwd.getpwnam("_mandos").pw_uid
1202
 
        gid = pwd.getpwnam("_mandos").pw_gid
1203
 
    except KeyError:
1204
 
        try:
1205
 
            uid = pwd.getpwnam("mandos").pw_uid
1206
 
            gid = pwd.getpwnam("mandos").pw_gid
1207
 
        except KeyError:
1208
 
            try:
1209
 
                uid = pwd.getpwnam("nobody").pw_uid
1210
 
                gid = pwd.getpwnam("nogroup").pw_gid
1211
 
            except KeyError:
1212
 
                uid = 65534
1213
 
                gid = 65534
1214
 
    try:
1215
 
        os.setgid(gid)
1216
 
        os.setuid(uid)
1217
 
    except OSError, error:
1218
 
        if error[0] != errno.EPERM:
1219
 
            raise error
1220
 
    
1221
 
    # Enable all possible GnuTLS debugging
1222
 
    if debug:
1223
 
        # "Use a log level over 10 to enable all debugging options."
1224
 
        # - GnuTLS manual
1225
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1226
 
        
1227
 
        @gnutls.library.types.gnutls_log_func
1228
 
        def debug_gnutls(level, string):
1229
 
            logger.debug("GnuTLS: %s", string[:-1])
1230
 
        
1231
 
        (gnutls.library.functions
1232
 
         .gnutls_global_set_log_function(debug_gnutls))
1233
 
    
1234
 
    global service
1235
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1236
 
    service = AvahiService(name = server_settings["servicename"],
1237
 
                           servicetype = "_mandos._tcp",
1238
 
                           protocol = protocol)
1239
 
    if server_settings["interface"]:
1240
 
        service.interface = (if_nametoindex
1241
 
                             (server_settings["interface"]))
1242
 
    
1243
 
    global main_loop
1244
 
    global bus
1245
 
    global server
1246
 
    # From the Avahi example code
 
575
    # Parse the time arguments
 
576
    try:
 
577
        options.timeout = string_to_delta(options.timeout)
 
578
    except ValueError:
 
579
        parser.error("option --timeout: Unparseable time")
 
580
    try:
 
581
        options.interval = string_to_delta(options.interval)
 
582
    except ValueError:
 
583
        parser.error("option --interval: Unparseable time")
 
584
    
 
585
    # Parse config file
 
586
    defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
 
587
    client_config = ConfigParser.SafeConfigParser(defaults)
 
588
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
 
589
    client_config.read("mandos-clients.conf")
 
590
    
 
591
    # From the Avahi server example code
1247
592
    DBusGMainLoop(set_as_default=True )
1248
593
    main_loop = gobject.MainLoop()
1249
594
    bus = dbus.SystemBus()
1250
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1251
 
                                           avahi.DBUS_PATH_SERVER),
1252
 
                            avahi.DBUS_INTERFACE_SERVER)
 
595
    server = dbus.Interface(
 
596
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
597
            avahi.DBUS_INTERFACE_SERVER )
1253
598
    # End of Avahi example code
1254
 
    if use_dbus:
1255
 
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
1256
 
    
1257
 
    client_class = Client
1258
 
    if use_dbus:
1259
 
        client_class = ClientDBus
1260
 
    clients.update(Set(
1261
 
            client_class(name = section,
1262
 
                         config= dict(client_config.items(section)))
1263
 
            for section in client_config.sections()))
1264
 
    if not clients:
1265
 
        logger.warning(u"No clients defined")
1266
 
    
 
599
    
 
600
    debug = options.debug
 
601
    
 
602
    clients = Set()
 
603
    def remove_from_clients(client):
 
604
        clients.remove(client)
 
605
        if not clients:
 
606
            if debug:
 
607
                sys.stderr.write(u"No clients left, exiting\n")
 
608
            main_loop.quit()
 
609
    
 
610
    clients.update(Set(Client(name=section, options=options,
 
611
                              stop_hook = remove_from_clients,
 
612
                              **(dict(client_config\
 
613
                                      .items(section))))
 
614
                       for section in client_config.sections()))
 
615
    for client in clients:
 
616
        client.start()
 
617
    
 
618
    tcp_server = IPv6_TCPServer((None, options.port),
 
619
                                tcp_handler,
 
620
                                options=options,
 
621
                                clients=clients)
 
622
    # Find out what random port we got
 
623
    servicePort = tcp_server.socket.getsockname()[1]
1267
624
    if debug:
1268
 
        # Redirect stdin so all checkers get /dev/null
1269
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1270
 
        os.dup2(null, sys.stdin.fileno())
1271
 
        if null > 2:
1272
 
            os.close(null)
1273
 
    else:
1274
 
        # No console logging
1275
 
        logger.removeHandler(console)
1276
 
        # Close all input and output, do double fork, etc.
1277
 
        daemon()
1278
 
    
1279
 
    try:
1280
 
        with closing(pidfile):
1281
 
            pid = os.getpid()
1282
 
            pidfile.write(str(pid) + "\n")
1283
 
        del pidfile
1284
 
    except IOError:
1285
 
        logger.error(u"Could not write to file %r with PID %d",
1286
 
                     pidfilename, pid)
1287
 
    except NameError:
1288
 
        # "pidfile" was never created
1289
 
        pass
1290
 
    del pidfilename
1291
 
    
1292
 
    def cleanup():
1293
 
        "Cleanup function; run on exit"
1294
 
        global group
1295
 
        # From the Avahi example code
1296
 
        if not group is None:
1297
 
            group.Free()
1298
 
            group = None
1299
 
        # End of Avahi example code
1300
 
        
1301
 
        while clients:
1302
 
            client = clients.pop()
1303
 
            client.disable_hook = None
1304
 
            client.disable()
1305
 
    
1306
 
    atexit.register(cleanup)
1307
 
    
1308
 
    if not debug:
1309
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1310
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1311
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1312
 
    
1313
 
    if use_dbus:
1314
 
        class MandosDBusService(dbus.service.Object):
1315
 
            """A D-Bus proxy object"""
1316
 
            def __init__(self):
1317
 
                dbus.service.Object.__init__(self, bus, "/")
1318
 
            _interface = u"se.bsnet.fukt.Mandos"
1319
 
            
1320
 
            @dbus.service.signal(_interface, signature="oa{sv}")
1321
 
            def ClientAdded(self, objpath, properties):
1322
 
                "D-Bus signal"
1323
 
                pass
1324
 
            
1325
 
            @dbus.service.signal(_interface, signature="s")
1326
 
            def ClientNotFound(self, fingerprint):
1327
 
                "D-Bus signal"
1328
 
                pass
1329
 
            
1330
 
            @dbus.service.signal(_interface, signature="os")
1331
 
            def ClientRemoved(self, objpath, name):
1332
 
                "D-Bus signal"
1333
 
                pass
1334
 
            
1335
 
            @dbus.service.method(_interface, out_signature="ao")
1336
 
            def GetAllClients(self):
1337
 
                "D-Bus method"
1338
 
                return dbus.Array(c.dbus_object_path for c in clients)
1339
 
            
1340
 
            @dbus.service.method(_interface, out_signature="a{oa{sv}}")
1341
 
            def GetAllClientsWithProperties(self):
1342
 
                "D-Bus method"
1343
 
                return dbus.Dictionary(
1344
 
                    ((c.dbus_object_path, c.GetAllProperties())
1345
 
                     for c in clients),
1346
 
                    signature="oa{sv}")
1347
 
            
1348
 
            @dbus.service.method(_interface, in_signature="o")
1349
 
            def RemoveClient(self, object_path):
1350
 
                "D-Bus method"
1351
 
                for c in clients:
1352
 
                    if c.dbus_object_path == object_path:
1353
 
                        clients.remove(c)
1354
 
                        c.remove_from_connection()
1355
 
                        # Don't signal anything except ClientRemoved
1356
 
                        c.disable(signal=False)
1357
 
                        # Emit D-Bus signal
1358
 
                        self.ClientRemoved(object_path, c.name)
1359
 
                        return
1360
 
                raise KeyError
1361
 
            
1362
 
            del _interface
1363
 
        
1364
 
        mandos_dbus_service = MandosDBusService()
1365
 
    
1366
 
    for client in clients:
1367
 
        if use_dbus:
1368
 
            # Emit D-Bus signal
1369
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path,
1370
 
                                            client.GetAllProperties())
1371
 
        client.enable()
1372
 
    
1373
 
    tcp_server.enable()
1374
 
    tcp_server.server_activate()
1375
 
    
1376
 
    # Find out what port we got
1377
 
    service.port = tcp_server.socket.getsockname()[1]
1378
 
    if use_ipv6:
1379
 
        logger.info(u"Now listening on address %r, port %d,"
1380
 
                    " flowinfo %d, scope_id %d"
1381
 
                    % tcp_server.socket.getsockname())
1382
 
    else:                       # IPv4
1383
 
        logger.info(u"Now listening on address %r, port %d"
1384
 
                    % tcp_server.socket.getsockname())
1385
 
    
1386
 
    #service.interface = tcp_server.socket.getsockname()[3]
1387
 
    
1388
 
    try:
1389
 
        # From the Avahi example code
1390
 
        server.connect_to_signal("StateChanged", server_state_changed)
1391
 
        try:
1392
 
            server_state_changed(server.GetState())
1393
 
        except dbus.exceptions.DBusException, error:
1394
 
            logger.critical(u"DBusException: %s", error)
1395
 
            sys.exit(1)
1396
 
        # End of Avahi example code
1397
 
        
1398
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1399
 
                             lambda *args, **kwargs:
1400
 
                             (tcp_server.handle_request
1401
 
                              (*args[2:], **kwargs) or True))
1402
 
        
1403
 
        logger.debug(u"Starting main loop")
 
625
        sys.stderr.write(u"Now listening on port %d\n" % servicePort)
 
626
    
 
627
    if options.interface is not None:
 
628
        serviceInterface = if_nametoindex(options.interface)
 
629
    
 
630
    # From the Avahi server example code
 
631
    server.connect_to_signal("StateChanged", server_state_changed)
 
632
    server_state_changed(server.GetState())
 
633
    # End of Avahi example code
 
634
    
 
635
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
636
                         lambda *args, **kwargs:
 
637
                         tcp_server.handle_request(*args[2:],
 
638
                                                   **kwargs) or True)
 
639
    try:
1404
640
        main_loop.run()
1405
 
    except AvahiError, error:
1406
 
        logger.critical(u"AvahiError: %s", error)
1407
 
        sys.exit(1)
1408
641
    except KeyboardInterrupt:
1409
 
        if debug:
1410
 
            print >> sys.stderr
1411
 
        logger.debug("Server received KeyboardInterrupt")
1412
 
    logger.debug("Server exiting")
 
642
        print
 
643
    
 
644
    # Cleanup here
1413
645
 
1414
 
if __name__ == '__main__':
1415
 
    main()
 
646
    # From the Avahi server example code
 
647
    if not group is None:
 
648
        group.Free()
 
649
    # End of Avahi example code
 
650
    
 
651
    for client in clients:
 
652
        client.stop_hook = None
 
653
        client.stop()