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* network-hooks.d/bridge: Use "/usr/sbin/brctl" explicitly.
* plugins.d/mandos-client.c (run_network_hooks): Raise priviliges in
                                                 child process.
  (main): Do not use getuid() to check if running setuid root.  Do not
          raise privileges for run_network_hooks.

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mandos-monitor
3
3
# 
4
4
# Mandos Monitor - Control and monitor the Mandos server
5
5
# 
6
 
# Copyright © 2009-2014 Teddy Hogeborn
7
 
# Copyright © 2009-2014 Björn Påhlsson
 
6
# Copyright © 2009-2011 Teddy Hogeborn
 
7
# Copyright © 2009-2011 Björn Påhlsson
8
8
# 
9
9
# This program is free software: you can redistribute it and/or modify
10
10
# it under the terms of the GNU General Public License as published by
17
17
#     GNU General Public License for more details.
18
18
# 
19
19
# You should have received a copy of the GNU General Public License
20
 
# along with this program.  If not, see
21
 
# <http://www.gnu.org/licenses/>.
 
20
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
22
21
# 
23
22
# Contact the authors at <mandos@recompile.se>.
24
23
# 
25
24
 
26
25
from __future__ import (division, absolute_import, print_function,
27
26
                        unicode_literals)
28
 
try:
29
 
    from future_builtins import *
30
 
except ImportError:
31
 
    pass
32
27
 
33
28
import sys
34
29
import os
 
30
import signal
35
31
 
36
32
import datetime
37
33
 
39
35
import urwid
40
36
 
41
37
from dbus.mainloop.glib import DBusGMainLoop
42
 
try:
43
 
    import gobject
44
 
except ImportError:
45
 
    from gi.repository import GObject as gobject
 
38
import gobject
46
39
 
47
40
import dbus
48
41
 
 
42
import UserList
 
43
 
49
44
import locale
50
45
 
51
 
if sys.version_info[0] == 2:
52
 
    str = unicode
53
 
 
54
46
locale.setlocale(locale.LC_ALL, '')
55
47
 
56
48
import logging
60
52
domain = 'se.recompile'
61
53
server_interface = domain + '.Mandos'
62
54
client_interface = domain + '.Mandos.Client'
63
 
version = "1.6.4"
 
55
version = "1.4.1"
 
56
 
 
57
# Always run in monochrome mode
 
58
urwid.curses_display.curses.has_colors = lambda : False
 
59
 
 
60
# Urwid doesn't support blinking, but we want it.  Since we have no
 
61
# use for underline on its own, we make underline also always blink.
 
62
urwid.curses_display.curses.A_UNDERLINE |= (
 
63
    urwid.curses_display.curses.A_BLINK)
64
64
 
65
65
def isoformat_to_datetime(iso):
66
66
    "Parse an ISO 8601 date string to a datetime.datetime()"
83
83
    properties and calls a hook function when any of them are
84
84
    changed.
85
85
    """
86
 
    def __init__(self, proxy_object=None, properties=None, **kwargs):
 
86
    def __init__(self, proxy_object=None, *args, **kwargs):
87
87
        self.proxy = proxy_object # Mandos Client proxy object
88
 
        self.properties = dict() if properties is None else properties
 
88
        
 
89
        self.properties = dict()
89
90
        self.property_changed_match = (
90
91
            self.proxy.connect_to_signal("PropertyChanged",
91
 
                                         self._property_changed,
 
92
                                         self.property_changed,
92
93
                                         client_interface,
93
94
                                         byte_arrays=True))
94
95
        
95
 
        if properties is None:
96
 
            self.properties.update(
97
 
                self.proxy.GetAll(client_interface,
98
 
                                  dbus_interface
99
 
                                  = dbus.PROPERTIES_IFACE))
100
 
        
101
 
        super(MandosClientPropertyCache, self).__init__(**kwargs)
102
 
    
103
 
    def _property_changed(self, property, value):
104
 
        """Helper which takes positional arguments"""
105
 
        return self.property_changed(property=property, value=value)
 
96
        self.properties.update(
 
97
            self.proxy.GetAll(client_interface,
 
98
                              dbus_interface = dbus.PROPERTIES_IFACE))
 
99
 
 
100
        #XXX This breaks good super behaviour
 
101
#        super(MandosClientPropertyCache, self).__init__(
 
102
#            *args, **kwargs)
106
103
    
107
104
    def property_changed(self, property=None, value=None):
108
105
        """This is called whenever we get a PropertyChanged signal
111
108
        # Update properties dict with new value
112
109
        self.properties[property] = value
113
110
    
114
 
    def delete(self):
 
111
    def delete(self, *args, **kwargs):
115
112
        self.property_changed_match.remove()
 
113
        super(MandosClientPropertyCache, self).__init__(
 
114
            *args, **kwargs)
116
115
 
117
116
 
118
117
class MandosClientWidget(urwid.FlowWidget, MandosClientPropertyCache):
120
119
    """
121
120
    
122
121
    def __init__(self, server_proxy_object=None, update_hook=None,
123
 
                 delete_hook=None, logger=None, **kwargs):
 
122
                 delete_hook=None, logger=None, *args, **kwargs):
124
123
        # Called on update
125
124
        self.update_hook = update_hook
126
125
        # Called on delete
131
130
        self.logger = logger
132
131
        
133
132
        self._update_timer_callback_tag = None
 
133
        self._update_timer_callback_lock = 0
 
134
        self.last_checker_failed = False
134
135
        
135
136
        # The widget shown normally
136
137
        self._text_widget = urwid.Text("")
137
138
        # The widget shown when we have focus
138
139
        self._focus_text_widget = urwid.Text("")
139
 
        super(MandosClientWidget, self).__init__(**kwargs)
 
140
        super(MandosClientWidget, self).__init__(
 
141
            update_hook=update_hook, delete_hook=delete_hook,
 
142
            *args, **kwargs)
140
143
        self.update()
141
144
        self.opened = False
142
145
        
 
146
        last_checked_ok = isoformat_to_datetime(self.properties
 
147
                                                ["LastCheckedOK"])
 
148
        if last_checked_ok is None:
 
149
            self.last_checker_failed = True
 
150
        else:
 
151
            self.last_checker_failed = ((datetime.datetime.utcnow()
 
152
                                         - last_checked_ok)
 
153
                                        > datetime.timedelta
 
154
                                        (milliseconds=
 
155
                                         self.properties
 
156
                                         ["Interval"]))
 
157
        
 
158
        if self.last_checker_failed:
 
159
            self.using_timer(True)
 
160
        
 
161
        if self.need_approval:
 
162
            self.using_timer(True)
 
163
        
143
164
        self.match_objects = (
144
165
            self.proxy.connect_to_signal("CheckerCompleted",
145
166
                                         self.checker_completed,
161
182
                                         self.rejected,
162
183
                                         client_interface,
163
184
                                         byte_arrays=True))
164
 
        #self.logger('Created client {0}'
165
 
        #            .format(self.properties["Name"]))
 
185
        #self.logger('Created client %s' % (self.properties["Name"]))
166
186
    
 
187
    def property_changed(self, property=None, value=None):
 
188
        super(self, MandosClientWidget).property_changed(property,
 
189
                                                         value)
 
190
        if property == "ApprovalPending":
 
191
            using_timer(bool(value))
 
192
        
167
193
    def using_timer(self, flag):
168
194
        """Call this method with True or False when timer should be
169
195
        activated or deactivated.
170
196
        """
171
 
        if flag and self._update_timer_callback_tag is None:
 
197
        old = self._update_timer_callback_lock
 
198
        if flag:
 
199
            self._update_timer_callback_lock += 1
 
200
        else:
 
201
            self._update_timer_callback_lock -= 1
 
202
        if old == 0 and self._update_timer_callback_lock:
172
203
            # Will update the shown timer value every second
173
204
            self._update_timer_callback_tag = (gobject.timeout_add
174
205
                                               (1000,
175
206
                                                self.update_timer))
176
 
        elif not (flag or self._update_timer_callback_tag is None):
 
207
        elif old and self._update_timer_callback_lock == 0:
177
208
            gobject.source_remove(self._update_timer_callback_tag)
178
209
            self._update_timer_callback_tag = None
179
210
    
180
211
    def checker_completed(self, exitstatus, condition, command):
181
212
        if exitstatus == 0:
 
213
            if self.last_checker_failed:
 
214
                self.last_checker_failed = False
 
215
                self.using_timer(False)
 
216
            #self.logger('Checker for client %s (command "%s")'
 
217
            #            ' was successful'
 
218
            #            % (self.properties["Name"], command))
182
219
            self.update()
183
220
            return
184
221
        # Checker failed
 
222
        if not self.last_checker_failed:
 
223
            self.last_checker_failed = True
 
224
            self.using_timer(True)
185
225
        if os.WIFEXITED(condition):
186
 
            self.logger('Checker for client {0} (command "{1}")'
187
 
                        ' failed with exit code {2}'
188
 
                        .format(self.properties["Name"], command,
189
 
                                os.WEXITSTATUS(condition)))
 
226
            self.logger('Checker for client %s (command "%s")'
 
227
                        ' failed with exit code %s'
 
228
                        % (self.properties["Name"], command,
 
229
                           os.WEXITSTATUS(condition)))
190
230
        elif os.WIFSIGNALED(condition):
191
 
            self.logger('Checker for client {0} (command "{1}") was'
192
 
                        ' killed by signal {2}'
193
 
                        .format(self.properties["Name"], command,
194
 
                                os.WTERMSIG(condition)))
 
231
            self.logger('Checker for client %s (command "%s")'
 
232
                        ' was killed by signal %s'
 
233
                        % (self.properties["Name"], command,
 
234
                           os.WTERMSIG(condition)))
195
235
        elif os.WCOREDUMP(condition):
196
 
            self.logger('Checker for client {0} (command "{1}")'
 
236
            self.logger('Checker for client %s (command "%s")'
197
237
                        ' dumped core'
198
 
                        .format(self.properties["Name"], command))
 
238
                        % (self.properties["Name"], command))
199
239
        else:
200
 
            self.logger('Checker for client {0} completed'
201
 
                        ' mysteriously'
202
 
                        .format(self.properties["Name"]))
 
240
            self.logger('Checker for client %s completed'
 
241
                        ' mysteriously')
203
242
        self.update()
204
243
    
205
244
    def checker_started(self, command):
206
 
        """Server signals that a checker started. This could be useful
207
 
           to log in the future. """
208
 
        #self.logger('Client {0} started checker "{1}"'
209
 
        #            .format(self.properties["Name"],
210
 
        #                    str(command)))
 
245
        #self.logger('Client %s started checker "%s"'
 
246
        #            % (self.properties["Name"], unicode(command)))
211
247
        pass
212
248
    
213
249
    def got_secret(self):
214
 
        self.logger('Client {0} received its secret'
215
 
                    .format(self.properties["Name"]))
 
250
        self.last_checker_failed = False
 
251
        self.logger('Client %s received its secret'
 
252
                    % self.properties["Name"])
216
253
    
217
254
    def need_approval(self, timeout, default):
218
255
        if not default:
219
 
            message = 'Client {0} needs approval within {1} seconds'
 
256
            message = 'Client %s needs approval within %s seconds'
220
257
        else:
221
 
            message = 'Client {0} will get its secret in {1} seconds'
222
 
        self.logger(message.format(self.properties["Name"],
223
 
                                   timeout/1000))
 
258
            message = 'Client %s will get its secret in %s seconds'
 
259
        self.logger(message
 
260
                    % (self.properties["Name"], timeout/1000))
 
261
        self.using_timer(True)
224
262
    
225
263
    def rejected(self, reason):
226
 
        self.logger('Client {0} was rejected; reason: {1}'
227
 
                    .format(self.properties["Name"], reason))
 
264
        self.logger('Client %s was rejected; reason: %s'
 
265
                    % (self.properties["Name"], reason))
228
266
    
229
267
    def selectable(self):
230
268
        """Make this a "selectable" widget.
252
290
                          "bold-underline-blink":
253
291
                              "bold-underline-blink-standout",
254
292
                          }
255
 
        
 
293
 
256
294
        # Rebuild focus and non-focus widgets using current properties
257
 
        
 
295
 
258
296
        # Base part of a client. Name!
259
 
        base = '{name}: '.format(name=self.properties["Name"])
 
297
        base = ('%(name)s: '
 
298
                      % {"name": self.properties["Name"]})
260
299
        if not self.properties["Enabled"]:
261
300
            message = "DISABLED"
262
 
            self.using_timer(False)
263
301
        elif self.properties["ApprovalPending"]:
264
302
            timeout = datetime.timedelta(milliseconds
265
303
                                         = self.properties
267
305
            last_approval_request = isoformat_to_datetime(
268
306
                self.properties["LastApprovalRequest"])
269
307
            if last_approval_request is not None:
270
 
                timer = max(timeout - (datetime.datetime.utcnow()
271
 
                                       - last_approval_request),
272
 
                            datetime.timedelta())
 
308
                timer = timeout - (datetime.datetime.utcnow()
 
309
                                   - last_approval_request)
273
310
            else:
274
311
                timer = datetime.timedelta()
275
312
            if self.properties["ApprovedByDefault"]:
276
 
                message = "Approval in {0}. (d)eny?"
 
313
                message = "Approval in %s. (d)eny?"
277
314
            else:
278
 
                message = "Denial in {0}. (a)pprove?"
279
 
            message = message.format(str(timer).rsplit(".", 1)[0])
280
 
            self.using_timer(True)
281
 
        elif self.properties["LastCheckerStatus"] != 0:
282
 
            # When checker has failed, show timer until client expires
 
315
                message = "Denial in %s. (a)pprove?"
 
316
            message = message % unicode(timer).rsplit(".", 1)[0]
 
317
        elif self.last_checker_failed:
 
318
            # When checker has failed, print a timer until client expires
283
319
            expires = self.properties["Expires"]
284
320
            if expires == "":
285
321
                timer = datetime.timedelta(0)
286
322
            else:
287
 
                expires = (datetime.datetime.strptime
288
 
                           (expires, '%Y-%m-%dT%H:%M:%S.%f'))
289
 
                timer = max(expires - datetime.datetime.utcnow(),
290
 
                            datetime.timedelta())
 
323
                expires = datetime.datetime.strptime(expires,
 
324
                                                     '%Y-%m-%dT%H:%M:%S.%f')
 
325
                timer = expires - datetime.datetime.utcnow()
291
326
            message = ('A checker has failed! Time until client'
292
 
                       ' gets disabled: {0}'
293
 
                       .format(str(timer).rsplit(".", 1)[0]))
294
 
            self.using_timer(True)
 
327
                       ' gets disabled: %s'
 
328
                           % unicode(timer).rsplit(".", 1)[0])
295
329
        else:
296
330
            message = "enabled"
297
 
            self.using_timer(False)
298
 
        self._text = "{0}{1}".format(base, message)
299
 
        
 
331
        self._text = "%s%s" % (base, message)
 
332
            
300
333
        if not urwid.supports_unicode():
301
334
            self._text = self._text.encode("ascii", "replace")
302
335
        textlist = [("normal", self._text)]
319
352
        self.update()
320
353
        return True             # Keep calling this
321
354
    
322
 
    def delete(self, **kwargs):
 
355
    def delete(self, *args, **kwargs):
323
356
        if self._update_timer_callback_tag is not None:
324
357
            gobject.source_remove(self._update_timer_callback_tag)
325
358
            self._update_timer_callback_tag = None
328
361
        self.match_objects = ()
329
362
        if self.delete_hook is not None:
330
363
            self.delete_hook(self)
331
 
        return super(MandosClientWidget, self).delete(**kwargs)
 
364
        return super(MandosClientWidget, self).delete(*args, **kwargs)
332
365
    
333
366
    def render(self, maxcolrow, focus=False):
334
367
        """Render differently if we have focus.
376
409
        else:
377
410
            return key
378
411
    
379
 
    def property_changed(self, property=None, **kwargs):
 
412
    def property_changed(self, property=None, value=None,
 
413
                         *args, **kwargs):
380
414
        """Call self.update() if old value is not new value.
381
415
        This overrides the method from MandosClientPropertyCache"""
382
 
        property_name = str(property)
 
416
        property_name = unicode(property)
383
417
        old_value = self.properties.get(property_name)
384
418
        super(MandosClientWidget, self).property_changed(
385
 
            property=property, **kwargs)
 
419
            property=property, value=value, *args, **kwargs)
386
420
        if self.properties.get(property_name) != old_value:
387
421
            self.update()
388
422
 
392
426
    "down" key presses, thus not allowing any containing widgets to
393
427
    use them as an excuse to shift focus away from this widget.
394
428
    """
395
 
    def keypress(self, *args, **kwargs):
396
 
        ret = super(ConstrainedListBox, self).keypress(*args, **kwargs)
 
429
    def keypress(self, maxcolrow, key):
 
430
        ret = super(ConstrainedListBox, self).keypress(maxcolrow, key)
397
431
        if ret in ("up", "down"):
398
432
            return
399
433
        return ret
412
446
                ("normal",
413
447
                 "default", "default", None),
414
448
                ("bold",
415
 
                 "bold", "default", "bold"),
 
449
                 "default", "default", "bold"),
416
450
                ("underline-blink",
417
 
                 "underline,blink", "default", "underline,blink"),
 
451
                 "default", "default", "underline"),
418
452
                ("standout",
419
 
                 "standout", "default", "standout"),
 
453
                 "default", "default", "standout"),
420
454
                ("bold-underline-blink",
421
 
                 "bold,underline,blink", "default", "bold,underline,blink"),
 
455
                 "default", "default", ("bold", "underline")),
422
456
                ("bold-standout",
423
 
                 "bold,standout", "default", "bold,standout"),
 
457
                 "default", "default", ("bold", "standout")),
424
458
                ("underline-blink-standout",
425
 
                 "underline,blink,standout", "default",
426
 
                 "underline,blink,standout"),
 
459
                 "default", "default", ("underline", "standout")),
427
460
                ("bold-underline-blink-standout",
428
 
                 "bold,underline,blink,standout", "default",
429
 
                 "bold,underline,blink,standout"),
 
461
                 "default", "default", ("bold", "underline",
 
462
                                          "standout")),
430
463
                ))
431
464
        
432
465
        if urwid.supports_unicode():
464
497
        
465
498
        self.busname = domain + '.Mandos'
466
499
        self.main_loop = gobject.MainLoop()
 
500
        self.bus = dbus.SystemBus()
 
501
        mandos_dbus_objc = self.bus.get_object(
 
502
            self.busname, "/", follow_name_owner_changes=True)
 
503
        self.mandos_serv = dbus.Interface(mandos_dbus_objc,
 
504
                                          dbus_interface
 
505
                                          = server_interface)
 
506
        try:
 
507
            mandos_clients = (self.mandos_serv
 
508
                              .GetAllClientsWithProperties())
 
509
        except dbus.exceptions.DBusException:
 
510
            mandos_clients = dbus.Dictionary()
 
511
        
 
512
        (self.mandos_serv
 
513
         .connect_to_signal("ClientRemoved",
 
514
                            self.find_and_remove_client,
 
515
                            dbus_interface=server_interface,
 
516
                            byte_arrays=True))
 
517
        (self.mandos_serv
 
518
         .connect_to_signal("ClientAdded",
 
519
                            self.add_new_client,
 
520
                            dbus_interface=server_interface,
 
521
                            byte_arrays=True))
 
522
        (self.mandos_serv
 
523
         .connect_to_signal("ClientNotFound",
 
524
                            self.client_not_found,
 
525
                            dbus_interface=server_interface,
 
526
                            byte_arrays=True))
 
527
        for path, client in mandos_clients.iteritems():
 
528
            client_proxy_object = self.bus.get_object(self.busname,
 
529
                                                      path)
 
530
            self.add_client(MandosClientWidget(server_proxy_object
 
531
                                               =self.mandos_serv,
 
532
                                               proxy_object
 
533
                                               =client_proxy_object,
 
534
                                               properties=client,
 
535
                                               update_hook
 
536
                                               =self.refresh,
 
537
                                               delete_hook
 
538
                                               =self.remove_client,
 
539
                                               logger
 
540
                                               =self.log_message),
 
541
                            path=path)
467
542
    
468
543
    def client_not_found(self, fingerprint, address):
469
 
        self.log_message("Client with address {0} and fingerprint"
470
 
                         " {1} could not be found"
471
 
                         .format(address, fingerprint))
 
544
        self.log_message(("Client with address %s and fingerprint %s"
 
545
                          " could not be found" % (address,
 
546
                                                    fingerprint)))
472
547
    
473
548
    def rebuild(self):
474
549
        """This rebuilds the User Interface.
484
559
                                                     self.divider)))
485
560
        if self.log_visible:
486
561
            self.uilist.append(self.logbox)
 
562
            pass
487
563
        self.topwidget = urwid.Pile(self.uilist)
488
564
    
489
565
    def log_message(self, message):
490
 
        """Log message formatted with timestamp"""
491
566
        timestamp = datetime.datetime.now().isoformat()
492
567
        self.log_message_raw(timestamp + ": " + message)
493
568
    
506
581
        self.log_visible = not self.log_visible
507
582
        self.rebuild()
508
583
        #self.log_message("Log visibility changed to: "
509
 
        #                 + str(self.log_visible))
 
584
        #                 + unicode(self.log_visible))
510
585
    
511
586
    def change_log_display(self):
512
587
        """Change type of log display.
528
603
            client = self.clients_dict[path]
529
604
        except KeyError:
530
605
            # not found?
531
 
            self.log_message("Unknown client {0!r} ({1!r}) removed"
532
 
                             .format(name, path))
 
606
            self.log_message("Unknown client %r (%r) removed", name,
 
607
                             path)
533
608
            return
534
609
        client.delete()
535
610
    
552
627
        if path is None:
553
628
            path = client.proxy.object_path
554
629
        self.clients_dict[path] = client
555
 
        self.clients.sort(key=lambda c: c.properties["Name"])
 
630
        self.clients.sort(None, lambda c: c.properties["Name"])
556
631
        self.refresh()
557
632
    
558
633
    def remove_client(self, client, path=None):
560
635
        if path is None:
561
636
            path = client.proxy.object_path
562
637
        del self.clients_dict[path]
 
638
        if not self.clients_dict:
 
639
            # Work around bug in Urwid 0.9.8.3 - if a SimpleListWalker
 
640
            # is completely emptied, we need to recreate it.
 
641
            self.clients = urwid.SimpleListWalker([])
 
642
            self.rebuild()
563
643
        self.refresh()
564
644
    
565
645
    def refresh(self):
569
649
    
570
650
    def run(self):
571
651
        """Start the main loop and exit when it's done."""
572
 
        self.bus = dbus.SystemBus()
573
 
        mandos_dbus_objc = self.bus.get_object(
574
 
            self.busname, "/", follow_name_owner_changes=True)
575
 
        self.mandos_serv = dbus.Interface(mandos_dbus_objc,
576
 
                                          dbus_interface
577
 
                                          = server_interface)
578
 
        try:
579
 
            mandos_clients = (self.mandos_serv
580
 
                              .GetAllClientsWithProperties())
581
 
            if not mandos_clients:
582
 
                self.log_message_raw(("bold", "Note: Server has no clients."))
583
 
        except dbus.exceptions.DBusException:
584
 
            self.log_message_raw(("bold", "Note: No Mandos server running."))
585
 
            mandos_clients = dbus.Dictionary()
586
 
        
587
 
        (self.mandos_serv
588
 
         .connect_to_signal("ClientRemoved",
589
 
                            self.find_and_remove_client,
590
 
                            dbus_interface=server_interface,
591
 
                            byte_arrays=True))
592
 
        (self.mandos_serv
593
 
         .connect_to_signal("ClientAdded",
594
 
                            self.add_new_client,
595
 
                            dbus_interface=server_interface,
596
 
                            byte_arrays=True))
597
 
        (self.mandos_serv
598
 
         .connect_to_signal("ClientNotFound",
599
 
                            self.client_not_found,
600
 
                            dbus_interface=server_interface,
601
 
                            byte_arrays=True))
602
 
        for path, client in mandos_clients.items():
603
 
            client_proxy_object = self.bus.get_object(self.busname,
604
 
                                                      path)
605
 
            self.add_client(MandosClientWidget(server_proxy_object
606
 
                                               =self.mandos_serv,
607
 
                                               proxy_object
608
 
                                               =client_proxy_object,
609
 
                                               properties=client,
610
 
                                               update_hook
611
 
                                               =self.refresh,
612
 
                                               delete_hook
613
 
                                               =self.remove_client,
614
 
                                               logger
615
 
                                               =self.log_message),
616
 
                            path=path)
617
 
        
618
652
        self.refresh()
619
653
        self._input_callback_tag = (gobject.io_add_watch
620
654
                                    (sys.stdin.fileno(),
717
751
    ui.run()
718
752
except KeyboardInterrupt:
719
753
    ui.screen.stop()
720
 
except Exception as e:
721
 
    ui.log_message(str(e))
 
754
except Exception, e:
 
755
    ui.log_message(unicode(e))
722
756
    ui.screen.stop()
723
757
    raise