summaryrefslogtreecommitdiff
path: root/src/leap/bitmask/backend.py
blob: 5748c4c63f8d01c664c560a2fec8ce03b96ce267 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
# -*- coding: utf-8 -*-
# backend.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
"""
Backend for everything
"""
import logging
import os
import socket
import time

from functools import partial
from Queue import Queue, Empty
from threading import Condition

from twisted.internet import reactor
from twisted.internet import threads, defer
from twisted.internet.task import LoopingCall
from twisted.python import log

import zope.interface
import zope.proxy

from leap.bitmask.config.providerconfig import ProviderConfig
from leap.bitmask.crypto.srpauth import SRPAuth
from leap.bitmask.crypto.srpregister import SRPRegister
from leap.bitmask.platform_init import IS_LINUX
from leap.bitmask.provider.providerbootstrapper import ProviderBootstrapper
from leap.bitmask.provider.pinned import PinnedProviders
from leap.bitmask.services import get_supported
from leap.bitmask.services.eip import eipconfig
from leap.bitmask.services.eip import get_openvpn_management
from leap.bitmask.services.eip.eipbootstrapper import EIPBootstrapper

from leap.bitmask.services.eip import vpnlauncher, vpnprocess
from leap.bitmask.services.eip import linuxvpnlauncher, darwinvpnlauncher
from leap.bitmask.services.eip import get_vpn_launcher

from leap.bitmask.services.mail.imapcontroller import IMAPController
from leap.bitmask.services.mail.smtpbootstrapper import SMTPBootstrapper
from leap.bitmask.services.mail.smtpconfig import SMTPConfig

from leap.bitmask.services.soledad.soledadbootstrapper import \
    SoledadBootstrapper
from leap.bitmask.util import force_eval

from leap.common import certs as leap_certs

from leap.keymanager import openpgp
from leap.keymanager.errors import KeyAddressMismatch, KeyFingerprintMismatch

from leap.soledad.client import NoStorageSecret, PassphraseTooShort

# Frontend side
from PySide import QtCore

logger = logging.getLogger(__name__)


class ILEAPComponent(zope.interface.Interface):
    """
    Interface that every component for the backend should comply to
    """

    key = zope.interface.Attribute("Key id for this component")


class ILEAPService(ILEAPComponent):
    """
    Interface that every Service needs to implement
    """

    def start(self, *args, **kwargs):
        """
        Start the service.
        """
        pass

    def stop(self, *args, **kwargs):
        """
        Stops the service.
        """
        pass

    def terminate(self):
        """
        Terminate the service, not necessarily in a nice way.
        """
        pass

    def status(self):
        """
        Return a json object with the current status for the service.

        :rtype: object (list, str, dict)
        """
        # XXX: Use a namedtuple or a specific object instead of a json
        # object, since parsing it will be problematic otherwise.
        # It has to be something easily serializable though.
        pass

    def set_configs(self, keyval):
        """
        Set the config parameters for this Service.

        :param keyval: values to configure
        :type keyval: dict, {str: str}
        """
        pass

    def get_configs(self, keys):
        """
        Return the configuration values for the list of keys.

        :param keys: keys to retrieve
        :type keys: list of str

        :rtype: dict, {str: str}
        """
        pass


class Provider(object):
    """
    Interfaces with setup and bootstrapping operations for a provider
    """

    zope.interface.implements(ILEAPComponent)

    def __init__(self, signaler=None, bypass_checks=False):
        """
        Constructor for the Provider component

        :param signaler: Object in charge of handling communication
                         back to the frontend
        :type signaler: Signaler
        :param bypass_checks: Set to true if the app should bypass
                              first round of checks for CA
                              certificates at bootstrap
        :type bypass_checks: bool
        """
        self.key = "provider"
        self._signaler = signaler
        self._provider_bootstrapper = ProviderBootstrapper(signaler,
                                                           bypass_checks)
        self._download_provider_defer = None
        self._provider_config = ProviderConfig()

    def setup_provider(self, provider):
        """
        Initiate the setup for a provider

        :param provider: URL for the provider
        :type provider: unicode

        :returns: the defer for the operation running in a thread.
        :rtype: twisted.internet.defer.Deferred
        """
        log.msg("Setting up provider %s..." % (provider.encode("idna"),))
        pb = self._provider_bootstrapper
        d = pb.run_provider_select_checks(provider, download_if_needed=True)
        self._download_provider_defer = d
        return d

    def cancel_setup_provider(self):
        """
        Cancel the ongoing setup provider defer (if any).
        """
        d = self._download_provider_defer
        if d is not None:
            d.cancel()

    def bootstrap(self, provider):
        """
        Second stage of bootstrapping for a provider.

        :param provider: URL for the provider
        :type provider: unicode

        :returns: the defer for the operation running in a thread.
        :rtype: twisted.internet.defer.Deferred
        """
        d = None

        config = ProviderConfig.get_provider_config(provider)
        self._provider_config = config
        if config is not None:
            d = self._provider_bootstrapper.run_provider_setup_checks(
                config, download_if_needed=True)
        else:
            if self._signaler is not None:
                self._signaler.signal(
                    self._signaler.PROV_PROBLEM_WITH_PROVIDER_KEY)
            logger.error("Could not load provider configuration.")
            self._login_widget.set_enabled(True)

        if d is None:
            d = defer.Deferred()
        return d

    def _get_services(self, domain):
        """
        Returns a list of services provided by the given provider.

        :param domain: the provider to get the services from.
        :type domain: str

        :rtype: list of str
        """
        services = []
        provider_config = ProviderConfig.get_provider_config(domain)
        if provider_config is not None:
            services = provider_config.get_services()

        return services

    def get_supported_services(self, domain):
        """
        Signal a list of supported services provided by the given provider.

        :param domain: the provider to get the services from.
        :type domain: str

        Signals:
            prov_get_supported_services -> list of unicode
        """
        services = get_supported(self._get_services(domain))

        self._signaler.signal(
            self._signaler.PROV_GET_SUPPORTED_SERVICES, services)

    def get_all_services(self, providers):
        """
        Signal a list of services provided by all the configured providers.

        :param providers: the list of providers to get the services.
        :type providers: list

        Signals:
            prov_get_all_services -> list of unicode
        """
        services_all = set()

        for domain in providers:
            services = self._get_services(domain)
            services_all = services_all.union(set(services))

        self._signaler.signal(
            self._signaler.PROV_GET_ALL_SERVICES, services_all)

    def get_details(self, domain, lang=None):
        """
        Signal a ProviderConfigLight object with the current ProviderConfig
        settings.

        :param domain: the domain name of the provider.
        :type domain: str
        :param lang: the language to use for localized strings.
        :type lang: str

        Signals:
            prov_get_details -> ProviderConfigLight
        """
        self._signaler.signal(
            self._signaler.PROV_GET_DETAILS,
            self._provider_config.get_light_config(domain, lang))

    def get_pinned_providers(self):
        """
        Signal the list of pinned provider domains.

        Signals:
            prov_get_pinned_providers -> list of provider domains
        """
        self._signaler.signal(
            self._signaler.PROV_GET_PINNED_PROVIDERS,
            PinnedProviders.domains())

class Register(object):
    """
    Interfaces with setup and bootstrapping operations for a provider
    """

    zope.interface.implements(ILEAPComponent)

    def __init__(self, signaler=None):
        """
        Constructor for the Register component

        :param signaler: Object in charge of handling communication
                         back to the frontend
        :type signaler: Signaler
        """
        self.key = "register"
        self._signaler = signaler

    def register_user(self, domain, username, password):
        """
        Register a user using the domain and password given as parameters.

        :param domain: the domain we need to register the user.
        :type domain: unicode
        :param username: the user name
        :type username: unicode
        :param password: the password for the username
        :type password: unicode

        :returns: the defer for the operation running in a thread.
        :rtype: twisted.internet.defer.Deferred
        """
        config = ProviderConfig.get_provider_config(domain)
        self._provider_config = config
        if config is not None:
            srpregister = SRPRegister(signaler=self._signaler,
                                      provider_config=config)
            return threads.deferToThread(
                partial(srpregister.register_user, username, password))
        else:
            if self._signaler is not None:
                self._signaler.signal(self._signaler.SRP_REGISTRATION_FAILED)
            logger.error("Could not load provider configuration.")


class EIP(object):
    """
    Interfaces with setup and launch of EIP
    """

    zope.interface.implements(ILEAPService)

    def __init__(self, signaler=None):
        """
        Constructor for the EIP component

        :param signaler: Object in charge of handling communication
                         back to the frontend
        :type signaler: Signaler
        """
        self.key = "eip"
        self._signaler = signaler
        self._eip_bootstrapper = EIPBootstrapper(signaler)
        self._eip_setup_defer = None
        self._provider_config = ProviderConfig()

        self._vpn = vpnprocess.VPN(signaler=signaler)

    def setup_eip(self, domain, skip_network=False):
        """
        Initiate the setup for a provider

        :param domain: URL for the provider
        :type domain: unicode
        :param skip_network: Whether checks that involve network should be done
                             or not
        :type skip_network: bool

        :returns: the defer for the operation running in a thread.
        :rtype: twisted.internet.defer.Deferred
        """
        config = ProviderConfig.get_provider_config(domain)
        self._provider_config = config
        if config is not None:
            if skip_network:
                return defer.Deferred()
            eb = self._eip_bootstrapper
            d = eb.run_eip_setup_checks(self._provider_config,
                                        download_if_needed=True)
            self._eip_setup_defer = d
            return d
        else:
            raise Exception("No provider setup loaded")

    def cancel_setup_eip(self):
        """
        Cancel the ongoing setup eip defer (if any).
        """
        d = self._eip_setup_defer
        if d is not None:
            d.cancel()

    def _start_eip(self, restart=False):
        """
        Start EIP

        :param restart: whether is is a restart.
        :type restart: bool
        """
        provider_config = self._provider_config
        eip_config = eipconfig.EIPConfig()
        domain = provider_config.get_domain()

        loaded = eipconfig.load_eipconfig_if_needed(
            provider_config, eip_config, domain)

        if not self._can_start(domain):
            if self._signaler is not None:
                self._signaler.signal(self._signaler.EIP_CONNECTION_ABORTED)
            return

        if not loaded:
            if self._signaler is not None:
                self._signaler.signal(self._signaler.EIP_CONNECTION_ABORTED)
            logger.error("Tried to start EIP but cannot find any "
                         "available provider!")
            return

        host, port = get_openvpn_management()
        self._vpn.start(eipconfig=eip_config,
                        providerconfig=provider_config,
                        socket_host=host, socket_port=port,
                        restart=restart)

    def start(self, *args, **kwargs):
        """
        Start the service.
        """
        signaler = self._signaler

        if not self._provider_config.loaded():
            # This means that the user didn't call setup_eip first.
            self._signaler.signal(signaler.BACKEND_BAD_CALL, "EIP.start(), "
                                  "no provider loaded")
            return

        try:
            self._start_eip(*args, **kwargs)
        except vpnprocess.OpenVPNAlreadyRunning:
            signaler.signal(signaler.EIP_OPENVPN_ALREADY_RUNNING)
        except vpnprocess.AlienOpenVPNAlreadyRunning:
            signaler.signal(signaler.EIP_ALIEN_OPENVPN_ALREADY_RUNNING)
        except vpnlauncher.OpenVPNNotFoundException:
            signaler.signal(signaler.EIP_OPENVPN_NOT_FOUND_ERROR)
        except vpnlauncher.VPNLauncherException:
            # TODO: this seems to be used for 'gateway not found' only.
            #       see vpnlauncher.py
            signaler.signal(signaler.EIP_VPN_LAUNCHER_EXCEPTION)
        except linuxvpnlauncher.EIPNoPolkitAuthAgentAvailable:
            signaler.signal(signaler.EIP_NO_POLKIT_AGENT_ERROR)
        except linuxvpnlauncher.EIPNoPkexecAvailable:
            signaler.signal(signaler.EIP_NO_PKEXEC_ERROR)
        except darwinvpnlauncher.EIPNoTunKextLoaded:
            signaler.signal(signaler.EIP_NO_TUN_KEXT_ERROR)
        except Exception as e:
            logger.error("Unexpected problem: {0!r}".format(e))
        else:
            logger.debug('EIP: no errors')

    def _do_stop(self, shutdown=False, restart=False):
        """
        Stop the service. This is run in a thread to avoid blocking.
        """
        self._vpn.terminate(shutdown, restart)
        if IS_LINUX:
            self._wait_for_firewall_down()

    def stop(self, shutdown=False, restart=False):
        """
        Stop the service.
        """
        return threads.deferToThread(self._do_stop, shutdown, restart)

    def _wait_for_firewall_down(self):
        """
        Wait for the firewall to come down.
        """
        # Due to how we delay the resolvconf action in linux.
        # XXX this *has* to wait for a reasonable lapse, since we have some
        # delay in vpn.terminate.
        # For a better solution it should be signaled from backend that
        # everything is clear to proceed, or a timeout happened.
        MAX_FW_WAIT_RETRIES = 25
        FW_WAIT_STEP = 0.5

        retry = 1

        while retry <= MAX_FW_WAIT_RETRIES:
            if self._vpn.is_fw_down():
                self._signaler.signal(self._signaler.EIP_STOPPED)
                return
            else:
                #msg = "Firewall is not down yet, waiting... {0} of {1}"
                #msg = msg.format(retry, MAX_FW_WAIT_RETRIES)
                #logger.debug(msg)
                time.sleep(FW_WAIT_STEP)
                retry += 1
        logger.warning("After waiting, firewall is not down... "
                       "You might experience lack of connectivity")

    def terminate(self):
        """
        Terminate the service, not necessarily in a nice way.
        """
        self._vpn.killit()

    def status(self):
        """
        Return a json object with the current status for the service.

        :rtype: object (list, str, dict)
        """
        # XXX: Use a namedtuple or a specific object instead of a json
        # object, since parsing it will be problematic otherwise.
        # It has to be something easily serializable though.
        pass

    def _provider_is_initialized(self, domain):
        """
        Return whether the given domain is initialized or not.

        :param domain: the domain to check
        :type domain: str

        :returns: True if is initialized, False otherwise.
        :rtype: bool
        """
        eipconfig_path = eipconfig.get_eipconfig_path(domain, relative=False)
        if os.path.isfile(eipconfig_path):
            return True
        else:
            return False

    def get_initialized_providers(self, domains):
        """
        Signal a list of the given domains and if they are initialized or not.

        :param domains: the list of domains to check.
        :type domain: list of str

        Signals:
            eip_get_initialized_providers -> list of tuple(unicode, bool)
        """
        filtered_domains = []
        for domain in domains:
            is_initialized = self._provider_is_initialized(domain)
            filtered_domains.append((domain, is_initialized))

        if self._signaler is not None:
            self._signaler.signal(self._signaler.EIP_GET_INITIALIZED_PROVIDERS,
                                  filtered_domains)

    def tear_fw_down(self):
        """
        Tear the firewall down.
        """
        self._vpn.tear_down_firewall()

    def get_gateways_list(self, domain):
        """
        Signal a list of gateways for the given provider.

        :param domain: the domain to get the gateways.
        :type domain: str

        Signals:
            eip_get_gateways_list -> list of unicode
            eip_get_gateways_list_error
            eip_uninitialized_provider
        """
        if not self._provider_is_initialized(domain):
            if self._signaler is not None:
                self._signaler.signal(
                    self._signaler.EIP_UNINITIALIZED_PROVIDER)
            return

        eip_config = eipconfig.EIPConfig()
        provider_config = ProviderConfig.get_provider_config(domain)

        api_version = provider_config.get_api_version()
        eip_config.set_api_version(api_version)
        eip_loaded = eip_config.load(eipconfig.get_eipconfig_path(domain))

        # check for other problems
        if not eip_loaded or provider_config is None:
            if self._signaler is not None:
                self._signaler.signal(
                    self._signaler.EIP_GET_GATEWAYS_LIST_ERROR)
            return

        gateways = eipconfig.VPNGatewaySelector(eip_config).get_gateways_list()

        if self._signaler is not None:
            self._signaler.signal(
                self._signaler.EIP_GET_GATEWAYS_LIST, gateways)

    def _can_start(self, domain):
        """
        Returns True if it has everything that is needed to run EIP,
        False otherwise

        :param domain: the domain for the provider to check
        :type domain: str
        """
        eip_config = eipconfig.EIPConfig()
        provider_config = ProviderConfig.get_provider_config(domain)

        api_version = provider_config.get_api_version()
        eip_config.set_api_version(api_version)
        eip_loaded = eip_config.load(eipconfig.get_eipconfig_path(domain))

        launcher = get_vpn_launcher()
        ovpn_path = force_eval(launcher.OPENVPN_BIN_PATH)
        if not os.path.isfile(ovpn_path):
            logger.error("Cannot start OpenVPN, binary not found")
            return False

        # check for other problems
        if not eip_loaded or provider_config is None:
            logger.error("Cannot load provider and eip config, cannot "
                         "autostart")
            return False

        client_cert_path = eip_config.\
            get_client_cert_path(provider_config, about_to_download=False)

        if leap_certs.should_redownload(client_cert_path):
            logger.error("The client should redownload the certificate,"
                         " cannot autostart")
            return False

        if not os.path.isfile(client_cert_path):
            logger.error("Can't find the certificate, cannot autostart")
            return False

        return True

    def can_start(self, domain):
        """
        Signal whether it has everything that is needed to run EIP or not

        :param domain: the domain for the provider to check
        :type domain: str

        Signals:
            eip_can_start
            eip_cannot_start
        """
        if self._can_start(domain):
            if self._signaler is not None:
                self._signaler.signal(self._signaler.EIP_CAN_START)
        else:
            if self._signaler is not None:
                self._signaler.signal(self._signaler.EIP_CANNOT_START)

    def check_dns(self, domain):
        """
        Check if we can resolve the given domain name.

        :param domain: the domain to check.
        :type domain: str
        """
        def do_check():
            """
            Try to resolve the domain name.
            """
            socket.gethostbyname(domain.encode('idna'))

        def check_ok(_):
            """
            Callback handler for `do_check`.
            """
            self._signaler.signal(self._signaler.EIP_DNS_OK)
            logger.debug("DNS check OK")

        def check_err(failure):
            """
            Errback handler for `do_check`.

            :param failure: the failure that triggered the errback.
            :type failure: twisted.python.failure.Failure
            """
            logger.debug("Can't resolve hostname. {0!r}".format(failure))

            self._signaler.signal(self._signaler.EIP_DNS_ERROR)

            # python 2.7.4 raises socket.error
            # python 2.7.5 raises socket.gaierror
            failure.trap(socket.gaierror, socket.error)

        d = threads.deferToThread(do_check)
        d.addCallback(check_ok)
        d.addErrback(check_err)


class Soledad(object):
    """
    Interfaces with setup of Soledad.
    """
    zope.interface.implements(ILEAPComponent)

    def __init__(self, soledad_proxy, keymanager_proxy, signaler=None):
        """
        Constructor for the Soledad component.

        :param soledad_proxy: proxy to pass around a Soledad object.
        :type soledad_proxy: zope.ProxyBase
        :param keymanager_proxy: proxy to pass around a Keymanager object.
        :type keymanager_proxy: zope.ProxyBase
        :param signaler: Object in charge of handling communication
                         back to the frontend
        :type signaler: Signaler
        """
        self.key = "soledad"
        self._soledad_proxy = soledad_proxy
        self._keymanager_proxy = keymanager_proxy
        self._signaler = signaler
        self._soledad_bootstrapper = SoledadBootstrapper(signaler)
        self._soledad_defer = None

    def bootstrap(self, username, domain, password):
        """
        Bootstrap Soledad with the user credentials.

        Signals:
            soledad_download_config
            soledad_gen_key

        :param user: user's login
        :type user: unicode
        :param domain: the domain that we are using.
        :type domain: unicode
        :param password: user's password
        :type password: unicode
        """
        provider_config = ProviderConfig.get_provider_config(domain)
        if provider_config is not None:
            self._soledad_defer = threads.deferToThread(
                self._soledad_bootstrapper.run_soledad_setup_checks,
                provider_config, username, password,
                download_if_needed=True)
            self._soledad_defer.addCallback(self._set_proxies_cb)
        else:
            if self._signaler is not None:
                self._signaler.signal(self._signaler.SOLEDAD_BOOTSTRAP_FAILED)
            logger.error("Could not load provider configuration.")

        return self._soledad_defer

    def _set_proxies_cb(self, _):
        """
        Update the soledad and keymanager proxies to reference the ones created
        in the bootstrapper.
        """
        zope.proxy.setProxiedObject(self._soledad_proxy,
                                    self._soledad_bootstrapper.soledad)
        zope.proxy.setProxiedObject(self._keymanager_proxy,
                                    self._soledad_bootstrapper.keymanager)

    def load_offline(self, username, password, uuid):
        """
        Load the soledad database in offline mode.

        :param username: full user id (user@provider)
        :type username: str or unicode
        :param password: the soledad passphrase
        :type password: unicode
        :param uuid: the user uuid
        :type uuid: str or unicode

        Signals:
            Signaler.soledad_offline_finished
            Signaler.soledad_offline_failed
        """
        self._soledad_bootstrapper.load_offline_soledad(
            username, password, uuid)

    def cancel_bootstrap(self):
        """
        Cancel the ongoing soledad bootstrap (if any).
        """
        if self._soledad_defer is not None:
            logger.debug("Cancelling soledad defer.")
            self._soledad_defer.cancel()
            self._soledad_defer = None
            zope.proxy.setProxiedObject(self._soledad_proxy, None)

    def close(self):
        """
        Close soledad database.
        """
        if not zope.proxy.sameProxiedObjects(self._soledad_proxy, None):
            self._soledad_proxy.close()
            zope.proxy.setProxiedObject(self._soledad_proxy, None)

    def _change_password_ok(self, _):
        """
        Password change callback.
        """
        if self._signaler is not None:
            self._signaler.signal(self._signaler.SOLEDAD_PASSWORD_CHANGE_OK)

    def _change_password_error(self, failure):
        """
        Password change errback.

        :param failure: failure object containing problem.
        :type failure: twisted.python.failure.Failure
        """
        if failure.check(NoStorageSecret):
            logger.error("No storage secret for password change in Soledad.")
        if failure.check(PassphraseTooShort):
            logger.error("Passphrase too short.")

        if self._signaler is not None:
            self._signaler.signal(self._signaler.SOLEDAD_PASSWORD_CHANGE_ERROR)

    def change_password(self, new_password):
        """
        Change the database's password.

        :param new_password: the new password.
        :type new_password: unicode

        :returns: a defer to interact with.
        :rtype: twisted.internet.defer.Deferred
        """
        d = threads.deferToThread(self._soledad_proxy.change_passphrase,
                                  new_password)
        d.addCallback(self._change_password_ok)
        d.addErrback(self._change_password_error)


class Keymanager(object):
    """
    Interfaces with KeyManager.
    """
    zope.interface.implements(ILEAPComponent)

    def __init__(self, keymanager_proxy, signaler=None):
        """
        Constructor for the Keymanager component.

        :param keymanager_proxy: proxy to pass around a Keymanager object.
        :type keymanager_proxy: zope.ProxyBase
        :param signaler: Object in charge of handling communication
                         back to the frontend
        :type signaler: Signaler
        """
        self.key = "keymanager"
        self._keymanager_proxy = keymanager_proxy
        self._signaler = signaler

    def import_keys(self, username, filename):
        """
        Imports the username's key pair.
        Those keys need to be ascii armored.

        :param username: the user that will have the imported pair of keys.
        :type username: str
        :param filename: the name of the file where the key pair is stored.
        :type filename: str
        """
        # NOTE: This feature is disabled right now since is dangerous
        return

        new_key = ''
        signal = None
        try:
            with open(filename, 'r') as keys_file:
                new_key = keys_file.read()
        except IOError as e:
            logger.error("IOError importing key. {0!r}".format(e))
            signal = self._signaler.KEYMANAGER_IMPORT_IOERROR
            self._signaler.signal(signal)
            return

        keymanager = self._keymanager_proxy
        try:
            public_key, private_key = keymanager.parse_openpgp_ascii_key(
                new_key)
        except (KeyAddressMismatch, KeyFingerprintMismatch) as e:
            logger.error(repr(e))
            signal = self._signaler.KEYMANAGER_IMPORT_DATAMISMATCH
            self._signaler.signal(signal)
            return

        if public_key is None or private_key is None:
            signal = self._signaler.KEYMANAGER_IMPORT_MISSINGKEY
            self._signaler.signal(signal)
            return

        current_public_key = keymanager.get_key(username, openpgp.OpenPGPKey)
        if public_key.address != current_public_key.address:
            logger.error("The key does not match the ID")
            signal = self._signaler.KEYMANAGER_IMPORT_ADDRESSMISMATCH
            self._signaler.signal(signal)
            return

        keymanager.delete_key(self._key)
        keymanager.delete_key(self._key_priv)
        keymanager.put_key(public_key)
        keymanager.put_key(private_key)
        keymanager.send_key(openpgp.OpenPGPKey)

        logger.debug('Import ok')
        signal = self._signaler.KEYMANAGER_IMPORT_OK

        self._signaler.signal(signal)

    def export_keys(self, username, filename):
        """
        Export the given username's keys to a file.

        :param username: the username whos keys we need to export.
        :type username: str
        :param filename: the name of the file where we want to save the keys.
        :type filename: str
        """
        keymanager = self._keymanager_proxy

        public_key = keymanager.get_key(username, openpgp.OpenPGPKey)
        private_key = keymanager.get_key(username, openpgp.OpenPGPKey,
                                         private=True)
        try:
            with open(filename, 'w') as keys_file:
                keys_file.write(public_key.key_data)
                keys_file.write(private_key.key_data)

            logger.debug('Export ok')
            self._signaler.signal(self._signaler.KEYMANAGER_EXPORT_OK)
        except IOError as e:
            logger.error("IOError exporting key. {0!r}".format(e))
            self._signaler.signal(self._signaler.KEYMANAGER_EXPORT_ERROR)

    def list_keys(self):
        """
        List all the keys stored in the local DB.
        """
        keys = self._keymanager_proxy.get_all_keys_in_local_db()
        self._signaler.signal(self._signaler.KEYMANAGER_KEYS_LIST, keys)

    def get_key_details(self, username):
        """
        List all the keys stored in the local DB.
        """
        public_key = self._keymanager_proxy.get_key(username,
                                                    openpgp.OpenPGPKey)
        details = (public_key.key_id, public_key.fingerprint)
        self._signaler.signal(self._signaler.KEYMANAGER_KEY_DETAILS, details)


class Mail(object):
    """
    Interfaces with setup and launch of Mail.
    """
    # We give each service some time to come to a halt before forcing quit
    SERVICE_STOP_TIMEOUT = 20

    zope.interface.implements(ILEAPComponent)

    def __init__(self, soledad_proxy, keymanager_proxy, signaler=None):
        """
        Constructor for the Mail component.

        :param soledad_proxy: proxy to pass around a Soledad object.
        :type soledad_proxy: zope.ProxyBase
        :param keymanager_proxy: proxy to pass around a Keymanager object.
        :type keymanager_proxy: zope.ProxyBase
        :param signaler: Object in charge of handling communication
                         back to the frontend
        :type signaler: Signaler
        """
        self.key = "mail"
        self._signaler = signaler
        self._soledad_proxy = soledad_proxy
        self._keymanager_proxy = keymanager_proxy
        self._imap_controller = IMAPController(self._soledad_proxy,
                                               self._keymanager_proxy)
        self._smtp_bootstrapper = SMTPBootstrapper()
        self._smtp_config = SMTPConfig()

    def start_smtp_service(self, full_user_id, download_if_needed=False):
        """
        Start the SMTP service.

        :param full_user_id: user id, in the form "user@provider"
        :type full_user_id: str
        :param download_if_needed: True if it should check for mtime
                                   for the file
        :type download_if_needed: bool

        :returns: a defer to interact with.
        :rtype: twisted.internet.defer.Deferred
        """
        return threads.deferToThread(
            self._smtp_bootstrapper.start_smtp_service,
            self._keymanager_proxy, full_user_id, download_if_needed)

    def start_imap_service(self, full_user_id, offline=False):
        """
        Start the IMAP service.

        :param full_user_id: user id, in the form "user@provider"
        :type full_user_id: str
        :param offline: whether imap should start in offline mode or not.
        :type offline: bool

        :returns: a defer to interact with.
        :rtype: twisted.internet.defer.Deferred
        """
        return threads.deferToThread(
            self._imap_controller.start_imap_service,
            full_user_id, offline)

    def stop_smtp_service(self):
        """
        Stop the SMTP service.

        :returns: a defer to interact with.
        :rtype: twisted.internet.defer.Deferred
        """
        return threads.deferToThread(self._smtp_bootstrapper.stop_smtp_service)

    def _stop_imap_service(self):
        """
        Stop imap and wait until the service is stopped to signal that is done.
        """
        cv = Condition()
        cv.acquire()
        threads.deferToThread(self._imap_controller.stop_imap_service, cv)
        logger.debug('Waiting for imap service to stop.')
        cv.wait(self.SERVICE_STOP_TIMEOUT)
        logger.debug('IMAP stopped')
        self._signaler.signal(self._signaler.IMAP_STOPPED)

    def stop_imap_service(self):
        """
        Stop imap service (fetcher, factory and port).

        :returns: a defer to interact with.
        :rtype: twisted.internet.defer.Deferred
        """
        return threads.deferToThread(self._stop_imap_service)


class Authenticate(object):
    """
    Interfaces with setup and bootstrapping operations for a provider
    """

    zope.interface.implements(ILEAPComponent)

    def __init__(self, signaler=None):
        """
        Constructor for the Authenticate component

        :param signaler: Object in charge of handling communication
                         back to the frontend
        :type signaler: Signaler
        """
        self.key = "authenticate"
        self._signaler = signaler
        self._login_defer = None
        self._srp_auth = SRPAuth(ProviderConfig(), self._signaler)

    def login(self, domain, username, password):
        """
        Execute the whole authentication process for a user

        :param domain: the domain where we need to authenticate.
        :type domain: unicode
        :param username: username for this session
        :type username: str
        :param password: password for this user
        :type password: str

        :returns: the defer for the operation running in a thread.
        :rtype: twisted.internet.defer.Deferred
        """
        config = ProviderConfig.get_provider_config(domain)
        if config is not None:
            self._srp_auth = SRPAuth(config, self._signaler)
            self._login_defer = self._srp_auth.authenticate(username, password)
            return self._login_defer
        else:
            if self._signaler is not None:
                self._signaler.signal(self._signaler.SRP_AUTH_ERROR)
            logger.error("Could not load provider configuration.")

    def cancel_login(self):
        """
        Cancel the ongoing login defer (if any).
        """
        d = self._login_defer
        if d is not None:
            d.cancel()

    def change_password(self, current_password, new_password):
        """
        Change the user's password.

        :param current_password: the current password of the user.
        :type current_password: str
        :param new_password: the new password for the user.
        :type new_password: str

        :returns: a defer to interact with.
        :rtype: twisted.internet.defer.Deferred
        """
        if not self._is_logged_in():
            if self._signaler is not None:
                self._signaler.signal(self._signaler.SRP_NOT_LOGGED_IN_ERROR)
            return

        return self._srp_auth.change_password(current_password, new_password)

    def logout(self):
        """
        Log out the current session.
        Expects a session_id to exists, might raise AssertionError
        """
        if not self._is_logged_in():
            if self._signaler is not None:
                self._signaler.signal(self._signaler.SRP_NOT_LOGGED_IN_ERROR)
            return

        self._srp_auth.logout()

    def _is_logged_in(self):
        """
        Return whether the user is logged in or not.

        :rtype: bool
        """
        return (self._srp_auth is not None and
                self._srp_auth.is_authenticated())

    def get_logged_in_status(self):
        """
        Signal if the user is currently logged in or not.
        """
        if self._signaler is None:
            return

        signal = None
        if self._is_logged_in():
            signal = self._signaler.SRP_STATUS_LOGGED_IN
        else:
            signal = self._signaler.SRP_STATUS_NOT_LOGGED_IN

        self._signaler.signal(signal)


class Signaler(QtCore.QObject):
    """
    Signaler object, handles converting string commands to Qt signals.

    This is intended for the separation in frontend/backend, this will
    live in the frontend.
    """

    ####################
    # These will only exist in the frontend
    # Signals for the ProviderBootstrapper
    prov_name_resolution = QtCore.Signal(object)
    prov_https_connection = QtCore.Signal(object)
    prov_download_provider_info = QtCore.Signal(object)

    prov_download_ca_cert = QtCore.Signal(object)
    prov_check_ca_fingerprint = QtCore.Signal(object)
    prov_check_api_certificate = QtCore.Signal(object)

    prov_problem_with_provider = QtCore.Signal(object)

    prov_unsupported_client = QtCore.Signal(object)
    prov_unsupported_api = QtCore.Signal(object)

    prov_get_all_services = QtCore.Signal(object)
    prov_get_supported_services = QtCore.Signal(object)
    prov_get_details = QtCore.Signal(object)
    prov_get_pinned_providers = QtCore.Signal(object)

    prov_cancelled_setup = QtCore.Signal(object)

    # Signals for SRPRegister
    srp_registration_finished = QtCore.Signal(object)
    srp_registration_failed = QtCore.Signal(object)
    srp_registration_taken = QtCore.Signal(object)

    # Signals for EIP bootstrapping
    eip_config_ready = QtCore.Signal(object)
    eip_client_certificate_ready = QtCore.Signal(object)

    eip_cancelled_setup = QtCore.Signal(object)

    # Signals for SRPAuth
    srp_auth_ok = QtCore.Signal(object)
    srp_auth_error = QtCore.Signal(object)
    srp_auth_server_error = QtCore.Signal(object)
    srp_auth_connection_error = QtCore.Signal(object)
    srp_auth_bad_user_or_password = QtCore.Signal(object)
    srp_logout_ok = QtCore.Signal(object)
    srp_logout_error = QtCore.Signal(object)
    srp_password_change_ok = QtCore.Signal(object)
    srp_password_change_error = QtCore.Signal(object)
    srp_password_change_badpw = QtCore.Signal(object)
    srp_not_logged_in_error = QtCore.Signal(object)
    srp_status_logged_in = QtCore.Signal(object)
    srp_status_not_logged_in = QtCore.Signal(object)

    # Signals for EIP
    eip_connected = QtCore.Signal(object)
    eip_disconnected = QtCore.Signal(object)
    eip_connection_died = QtCore.Signal(object)
    eip_connection_aborted = QtCore.Signal(object)
    eip_stopped = QtCore.Signal(object)

    eip_dns_ok = QtCore.Signal(object)
    eip_dns_error = QtCore.Signal(object)

    # EIP problems
    eip_no_polkit_agent_error = QtCore.Signal(object)
    eip_no_tun_kext_error = QtCore.Signal(object)
    eip_no_pkexec_error = QtCore.Signal(object)
    eip_openvpn_not_found_error = QtCore.Signal(object)
    eip_openvpn_already_running = QtCore.Signal(object)
    eip_alien_openvpn_already_running = QtCore.Signal(object)
    eip_vpn_launcher_exception = QtCore.Signal(object)

    eip_get_gateways_list = QtCore.Signal(object)
    eip_get_gateways_list_error = QtCore.Signal(object)
    eip_uninitialized_provider = QtCore.Signal(object)
    eip_get_initialized_providers = QtCore.Signal(object)

    # signals from parsing openvpn output
    eip_network_unreachable = QtCore.Signal(object)
    eip_process_restart_tls = QtCore.Signal(object)
    eip_process_restart_ping = QtCore.Signal(object)

    # signals from vpnprocess.py
    eip_state_changed = QtCore.Signal(dict)
    eip_status_changed = QtCore.Signal(dict)
    eip_process_finished = QtCore.Signal(int)
    eip_tear_fw_down = QtCore.Signal(object)

    # signals whether the needed files to start EIP exist or not
    eip_can_start = QtCore.Signal(object)
    eip_cannot_start = QtCore.Signal(object)

    # Signals for Soledad
    soledad_bootstrap_failed = QtCore.Signal(object)
    soledad_bootstrap_finished = QtCore.Signal(object)
    soledad_offline_failed = QtCore.Signal(object)
    soledad_offline_finished = QtCore.Signal(object)
    soledad_invalid_auth_token = QtCore.Signal(object)
    soledad_cancelled_bootstrap = QtCore.Signal(object)
    soledad_password_change_ok = QtCore.Signal(object)
    soledad_password_change_error = QtCore.Signal(object)

    # Keymanager signals
    keymanager_export_ok = QtCore.Signal(object)
    keymanager_export_error = QtCore.Signal(object)
    keymanager_keys_list = QtCore.Signal(object)

    keymanager_import_ioerror = QtCore.Signal(object)
    keymanager_import_datamismatch = QtCore.Signal(object)
    keymanager_import_missingkey = QtCore.Signal(object)
    keymanager_import_addressmismatch = QtCore.Signal(object)
    keymanager_import_ok = QtCore.Signal(object)

    keymanager_key_details = QtCore.Signal(object)

    # mail related signals
    imap_stopped = QtCore.Signal(object)

    # This signal is used to warn the backend user that is doing something
    # wrong
    backend_bad_call = QtCore.Signal(object)

    ####################
    # These will exist both in the backend AND the front end.
    # The frontend might choose to not "interpret" all the signals
    # from the backend, but the backend needs to have all the signals
    # it's going to emit defined here
    PROV_NAME_RESOLUTION_KEY = "prov_name_resolution"
    PROV_HTTPS_CONNECTION_KEY = "prov_https_connection"
    PROV_DOWNLOAD_PROVIDER_INFO_KEY = "prov_download_provider_info"
    PROV_DOWNLOAD_CA_CERT_KEY = "prov_download_ca_cert"
    PROV_CHECK_CA_FINGERPRINT_KEY = "prov_check_ca_fingerprint"
    PROV_CHECK_API_CERTIFICATE_KEY = "prov_check_api_certificate"
    PROV_PROBLEM_WITH_PROVIDER_KEY = "prov_problem_with_provider"
    PROV_UNSUPPORTED_CLIENT = "prov_unsupported_client"
    PROV_UNSUPPORTED_API = "prov_unsupported_api"
    PROV_CANCELLED_SETUP = "prov_cancelled_setup"
    PROV_GET_ALL_SERVICES = "prov_get_all_services"
    PROV_GET_SUPPORTED_SERVICES = "prov_get_supported_services"
    PROV_GET_DETAILS = "prov_get_details"
    PROV_GET_PINNED_PROVIDERS = "prov_get_pinned_providers"

    SRP_REGISTRATION_FINISHED = "srp_registration_finished"
    SRP_REGISTRATION_FAILED = "srp_registration_failed"
    SRP_REGISTRATION_TAKEN = "srp_registration_taken"
    SRP_AUTH_OK = "srp_auth_ok"
    SRP_AUTH_ERROR = "srp_auth_error"
    SRP_AUTH_SERVER_ERROR = "srp_auth_server_error"
    SRP_AUTH_CONNECTION_ERROR = "srp_auth_connection_error"
    SRP_AUTH_BAD_USER_OR_PASSWORD = "srp_auth_bad_user_or_password"
    SRP_LOGOUT_OK = "srp_logout_ok"
    SRP_LOGOUT_ERROR = "srp_logout_error"
    SRP_PASSWORD_CHANGE_OK = "srp_password_change_ok"
    SRP_PASSWORD_CHANGE_ERROR = "srp_password_change_error"
    SRP_PASSWORD_CHANGE_BADPW = "srp_password_change_badpw"
    SRP_NOT_LOGGED_IN_ERROR = "srp_not_logged_in_error"
    SRP_STATUS_LOGGED_IN = "srp_status_logged_in"
    SRP_STATUS_NOT_LOGGED_IN = "srp_status_not_logged_in"

    EIP_CONFIG_READY = "eip_config_ready"
    EIP_CLIENT_CERTIFICATE_READY = "eip_client_certificate_ready"
    EIP_CANCELLED_SETUP = "eip_cancelled_setup"

    EIP_CONNECTED = "eip_connected"
    EIP_DISCONNECTED = "eip_disconnected"
    EIP_CONNECTION_DIED = "eip_connection_died"
    EIP_CONNECTION_ABORTED = "eip_connection_aborted"
    EIP_STOPPED = "eip_stopped"

    EIP_NO_POLKIT_AGENT_ERROR = "eip_no_polkit_agent_error"
    EIP_NO_TUN_KEXT_ERROR = "eip_no_tun_kext_error"
    EIP_NO_PKEXEC_ERROR = "eip_no_pkexec_error"
    EIP_OPENVPN_NOT_FOUND_ERROR = "eip_openvpn_not_found_error"
    EIP_OPENVPN_ALREADY_RUNNING = "eip_openvpn_already_running"
    EIP_ALIEN_OPENVPN_ALREADY_RUNNING = "eip_alien_openvpn_already_running"
    EIP_VPN_LAUNCHER_EXCEPTION = "eip_vpn_launcher_exception"

    EIP_GET_GATEWAYS_LIST = "eip_get_gateways_list"
    EIP_GET_GATEWAYS_LIST_ERROR = "eip_get_gateways_list_error"
    EIP_UNINITIALIZED_PROVIDER = "eip_uninitialized_provider"
    EIP_GET_INITIALIZED_PROVIDERS = "eip_get_initialized_providers"

    EIP_NETWORK_UNREACHABLE = "eip_network_unreachable"
    EIP_PROCESS_RESTART_TLS = "eip_process_restart_tls"
    EIP_PROCESS_RESTART_PING = "eip_process_restart_ping"

    EIP_STATE_CHANGED = "eip_state_changed"
    EIP_STATUS_CHANGED = "eip_status_changed"
    EIP_PROCESS_FINISHED = "eip_process_finished"
    EIP_TEAR_FW_DOWN = "eip_tear_fw_down"

    EIP_CAN_START = "eip_can_start"
    EIP_CANNOT_START = "eip_cannot_start"

    EIP_DNS_OK = "eip_dns_ok"
    EIP_DNS_ERROR = "eip_dns_error"

    SOLEDAD_BOOTSTRAP_FAILED = "soledad_bootstrap_failed"
    SOLEDAD_BOOTSTRAP_FINISHED = "soledad_bootstrap_finished"
    SOLEDAD_OFFLINE_FAILED = "soledad_offline_failed"
    SOLEDAD_OFFLINE_FINISHED = "soledad_offline_finished"
    SOLEDAD_INVALID_AUTH_TOKEN = "soledad_invalid_auth_token"

    SOLEDAD_PASSWORD_CHANGE_OK = "soledad_password_change_ok"
    SOLEDAD_PASSWORD_CHANGE_ERROR = "soledad_password_change_error"

    SOLEDAD_CANCELLED_BOOTSTRAP = "soledad_cancelled_bootstrap"

    KEYMANAGER_EXPORT_OK = "keymanager_export_ok"
    KEYMANAGER_EXPORT_ERROR = "keymanager_export_error"
    KEYMANAGER_KEYS_LIST = "keymanager_keys_list"

    KEYMANAGER_IMPORT_IOERROR = "keymanager_import_ioerror"
    KEYMANAGER_IMPORT_DATAMISMATCH = "keymanager_import_datamismatch"
    KEYMANAGER_IMPORT_MISSINGKEY = "keymanager_import_missingkey"
    KEYMANAGER_IMPORT_ADDRESSMISMATCH = "keymanager_import_addressmismatch"
    KEYMANAGER_IMPORT_OK = "keymanager_import_ok"
    KEYMANAGER_KEY_DETAILS = "keymanager_key_details"

    IMAP_STOPPED = "imap_stopped"

    BACKEND_BAD_CALL = "backend_bad_call"

    def __init__(self):
        """
        Constructor for the Signaler
        """
        QtCore.QObject.__init__(self)
        self._signals = {}

        signals = [
            self.PROV_NAME_RESOLUTION_KEY,
            self.PROV_HTTPS_CONNECTION_KEY,
            self.PROV_DOWNLOAD_PROVIDER_INFO_KEY,
            self.PROV_DOWNLOAD_CA_CERT_KEY,
            self.PROV_CHECK_CA_FINGERPRINT_KEY,
            self.PROV_CHECK_API_CERTIFICATE_KEY,
            self.PROV_PROBLEM_WITH_PROVIDER_KEY,
            self.PROV_UNSUPPORTED_CLIENT,
            self.PROV_UNSUPPORTED_API,
            self.PROV_CANCELLED_SETUP,
            self.PROV_GET_ALL_SERVICES,
            self.PROV_GET_SUPPORTED_SERVICES,
            self.PROV_GET_DETAILS,
            self.PROV_GET_PINNED_PROVIDERS,

            self.SRP_REGISTRATION_FINISHED,
            self.SRP_REGISTRATION_FAILED,
            self.SRP_REGISTRATION_TAKEN,

            self.EIP_CONFIG_READY,
            self.EIP_CLIENT_CERTIFICATE_READY,
            self.EIP_CANCELLED_SETUP,

            self.EIP_CONNECTED,
            self.EIP_DISCONNECTED,
            self.EIP_CONNECTION_DIED,
            self.EIP_CONNECTION_ABORTED,
            self.EIP_STOPPED,

            self.EIP_NO_POLKIT_AGENT_ERROR,
            self.EIP_NO_TUN_KEXT_ERROR,
            self.EIP_NO_PKEXEC_ERROR,
            self.EIP_OPENVPN_NOT_FOUND_ERROR,
            self.EIP_OPENVPN_ALREADY_RUNNING,
            self.EIP_ALIEN_OPENVPN_ALREADY_RUNNING,
            self.EIP_VPN_LAUNCHER_EXCEPTION,

            self.EIP_GET_GATEWAYS_LIST,
            self.EIP_GET_GATEWAYS_LIST_ERROR,
            self.EIP_UNINITIALIZED_PROVIDER,
            self.EIP_GET_INITIALIZED_PROVIDERS,

            self.EIP_NETWORK_UNREACHABLE,
            self.EIP_PROCESS_RESTART_TLS,
            self.EIP_PROCESS_RESTART_PING,

            self.EIP_STATE_CHANGED,
            self.EIP_STATUS_CHANGED,
            self.EIP_PROCESS_FINISHED,

            self.EIP_CAN_START,
            self.EIP_CANNOT_START,

            self.EIP_DNS_OK,
            self.EIP_DNS_ERROR,

            self.SRP_AUTH_OK,
            self.SRP_AUTH_ERROR,
            self.SRP_AUTH_SERVER_ERROR,
            self.SRP_AUTH_CONNECTION_ERROR,
            self.SRP_AUTH_BAD_USER_OR_PASSWORD,
            self.SRP_LOGOUT_OK,
            self.SRP_LOGOUT_ERROR,
            self.SRP_PASSWORD_CHANGE_OK,
            self.SRP_PASSWORD_CHANGE_ERROR,
            self.SRP_PASSWORD_CHANGE_BADPW,
            self.SRP_NOT_LOGGED_IN_ERROR,
            self.SRP_STATUS_LOGGED_IN,
            self.SRP_STATUS_NOT_LOGGED_IN,

            self.SOLEDAD_BOOTSTRAP_FAILED,
            self.SOLEDAD_BOOTSTRAP_FINISHED,
            self.SOLEDAD_OFFLINE_FAILED,
            self.SOLEDAD_OFFLINE_FINISHED,
            self.SOLEDAD_INVALID_AUTH_TOKEN,
            self.SOLEDAD_CANCELLED_BOOTSTRAP,

            self.SOLEDAD_PASSWORD_CHANGE_OK,
            self.SOLEDAD_PASSWORD_CHANGE_ERROR,

            self.KEYMANAGER_EXPORT_OK,
            self.KEYMANAGER_EXPORT_ERROR,
            self.KEYMANAGER_KEYS_LIST,

            self.KEYMANAGER_IMPORT_IOERROR,
            self.KEYMANAGER_IMPORT_DATAMISMATCH,
            self.KEYMANAGER_IMPORT_MISSINGKEY,
            self.KEYMANAGER_IMPORT_ADDRESSMISMATCH,
            self.KEYMANAGER_IMPORT_OK,
            self.KEYMANAGER_KEY_DETAILS,

            self.IMAP_STOPPED,

            self.BACKEND_BAD_CALL,
        ]

        for sig in signals:
            self._signals[sig] = getattr(self, sig)

    def signal(self, key, data=None):
        """
        Emits a Qt signal based on the key provided, with the data if provided.

        :param key: string identifying the signal to emit
        :type key: str
        :param data: object to send with the data
        :type data: object

        NOTE: The data object will be a serialized str in the backend,
        and an unserialized object in the frontend, but for now we
        just care about objects.
        """
        # Right now it emits Qt signals. The backend version of this
        # will do zmq.send_multipart, and the frontend version will be
        # similar to this

        # for some reason emitting 'None' gives a segmentation fault.
        if data is None:
            data = ''

        try:
            self._signals[key].emit(data)
        except KeyError:
            log.err("Unknown key for signal %s!" % (key,))


class Backend(object):
    """
    Backend for everything, the UI should only use this class.
    """

    PASSED_KEY = "passed"
    ERROR_KEY = "error"

    def __init__(self, bypass_checks=False):
        """
        Constructor for the backend.
        """
        # Components map for the commands received
        self._components = {}

        # Ongoing defers that will be cancelled at stop time
        self._ongoing_defers = []

        # Signaler object to translate commands into Qt signals
        self._signaler = Signaler()

        # Objects needed by several components, so we make a proxy and pass
        # them around
        self._soledad_proxy = zope.proxy.ProxyBase(None)
        self._keymanager_proxy = zope.proxy.ProxyBase(None)

        # Component registration
        self._register(Provider(self._signaler, bypass_checks))
        self._register(Register(self._signaler))
        self._register(Authenticate(self._signaler))
        self._register(EIP(self._signaler))
        self._register(Soledad(self._soledad_proxy,
                               self._keymanager_proxy,
                               self._signaler))
        self._register(Keymanager(self._keymanager_proxy,
                                  self._signaler))
        self._register(Mail(self._soledad_proxy,
                            self._keymanager_proxy,
                            self._signaler))

        # We have a looping call on a thread executing all the
        # commands in queue. Right now this queue is an actual Queue
        # object, but it'll become the zmq recv_multipart queue
        self._lc = LoopingCall(threads.deferToThread, self._worker)

        # Temporal call_queue for worker, will be replaced with
        # recv_multipart os something equivalent in the loopingcall
        self._call_queue = Queue()

    @property
    def signaler(self):
        """
        Public signaler access to let the UI connect to its signals.
        """
        return self._signaler

    def start(self):
        """
        Starts the looping call
        """
        logger.debug("Starting worker...")
        self._lc.start(0.01)

    def stop(self):
        """
        Stops the looping call and tries to cancel all the defers.
        """
        reactor.callLater(2, self._stop)

    def _stop(self):
        """
        Delayed stopping of worker. Called from `stop`.
        """
        logger.debug("Stopping worker...")
        if self._lc.running:
            self._lc.stop()
        else:
            logger.warning("Looping call is not running, cannot stop")

        logger.debug("Cancelling ongoing defers...")
        while len(self._ongoing_defers) > 0:
            d = self._ongoing_defers.pop()
            d.cancel()
        logger.debug("Defers cancelled.")

    def _register(self, component):
        """
        Registers a component in this backend

        :param component: Component to register
        :type component: any object that implements ILEAPComponent
        """
        # TODO: assert that the component implements the interfaces
        # expected
        try:
            self._components[component.key] = component
        except Exception:
            logger.error("There was a problem registering %s" % (component,))

    def _signal_back(self, _, signal):
        """
        Helper method to signal back (callback like behavior) to the
        UI that an operation finished.

        :param signal: signal name
        :type signal: str
        """
        self._signaler.signal(signal)

    def _worker(self):
        """
        Worker method, called from a different thread and as a part of
        a looping call
        """
        try:
            # this'll become recv_multipart
            cmd = self._call_queue.get(block=False)

            # cmd is: component, method, signalback, *args
            func = getattr(self._components[cmd[0]], cmd[1])
            d = func(*cmd[3:])
            if d is not None:  # d may be None if a defer chain is cancelled.
                # A call might not have a callback signal, but if it does,
                # we add it to the chain
                if cmd[2] is not None:
                    d.addCallbacks(self._signal_back, logger.error, cmd[2])
                d.addCallbacks(self._done_action, logger.error,
                               callbackKeywords={"d": d})
                d.addErrback(logger.error)
                self._ongoing_defers.append(d)
        except Empty:
            # If it's just empty we don't have anything to do.
            pass
        except defer.CancelledError:
            logger.debug("defer cancelled somewhere (CancelledError).")
        except Exception as e:
            # But we log the rest
            logger.exception("Unexpected exception: {0!r}".format(e))

    def _done_action(self, _, d):
        """
        Remover of the defer once it's done

        :param d: defer to remove
        :type d: twisted.internet.defer.Deferred
        """
        if d in self._ongoing_defers:
            self._ongoing_defers.remove(d)

    # XXX: Temporal interface until we migrate to zmq
    # We simulate the calls to zmq.send_multipart. Once we separate
    # this in two processes, the methods bellow can be changed to
    # send_multipart and this backend class will be really simple.

    def provider_setup(self, provider):
        """
        Initiate the setup for a provider.

        :param provider: URL for the provider
        :type provider: unicode

        Signals:
            prov_unsupported_client
            prov_unsupported_api
            prov_name_resolution        -> { PASSED_KEY: bool, ERROR_KEY: str }
            prov_https_connection       -> { PASSED_KEY: bool, ERROR_KEY: str }
            prov_download_provider_info -> { PASSED_KEY: bool, ERROR_KEY: str }
        """
        self._call_queue.put(("provider", "setup_provider", None, provider))

    def provider_cancel_setup(self):
        """
        Cancel the ongoing setup provider (if any).
        """
        self._call_queue.put(("provider", "cancel_setup_provider", None))

    def provider_bootstrap(self, provider):
        """
        Second stage of bootstrapping for a provider.

        :param provider: URL for the provider
        :type provider: unicode

        Signals:
            prov_problem_with_provider
            prov_download_ca_cert      -> {PASSED_KEY: bool, ERROR_KEY: str}
            prov_check_ca_fingerprint  -> {PASSED_KEY: bool, ERROR_KEY: str}
            prov_check_api_certificate -> {PASSED_KEY: bool, ERROR_KEY: str}
        """
        self._call_queue.put(("provider", "bootstrap", None, provider))

    def provider_get_supported_services(self, domain):
        """
        Signal a list of supported services provided by the given provider.

        :param domain: the provider to get the services from.
        :type domain: str

        Signals:
            prov_get_supported_services -> list of unicode
        """
        self._call_queue.put(("provider", "get_supported_services", None,
                              domain))

    def provider_get_all_services(self, providers):
        """
        Signal a list of services provided by all the configured providers.

        :param providers: the list of providers to get the services.
        :type providers: list

        Signals:
            prov_get_all_services -> list of unicode
        """
        self._call_queue.put(("provider", "get_all_services", None,
                              providers))

    def provider_get_details(self, domain, lang):
        """
        Signal a ProviderConfigLight object with the current ProviderConfig
        settings.

        :param domain: the domain name of the provider.
        :type domain: str
        :param lang: the language to use for localized strings.
        :type lang: str

        Signals:
            prov_get_details -> ProviderConfigLight
        """
        self._call_queue.put(("provider", "get_details", None, domain, lang))

    def provider_get_pinned_providers(self):
        """
        Signal the pinned providers.

        Signals:
            prov_get_pinned_providers -> list of provider domains
        """
        self._call_queue.put(("provider", "get_pinned_providers", None))

    def user_register(self, provider, username, password):
        """
        Register a user using the domain and password given as parameters.

        :param domain: the domain we need to register the user.
        :type domain: unicode
        :param username: the user name
        :type username: unicode
        :param password: the password for the username
        :type password: unicode

        Signals:
            srp_registration_finished
            srp_registration_taken
            srp_registration_failed
        """
        self._call_queue.put(("register", "register_user", None, provider,
                              username, password))

    def eip_setup(self, provider, skip_network=False):
        """
        Initiate the setup for a provider

        :param provider: URL for the provider
        :type provider: unicode
        :param skip_network: Whether checks that involve network should be done
                             or not
        :type skip_network: bool

        Signals:
            eip_config_ready             -> {PASSED_KEY: bool, ERROR_KEY: str}
            eip_client_certificate_ready -> {PASSED_KEY: bool, ERROR_KEY: str}
            eip_cancelled_setup
        """
        self._call_queue.put(("eip", "setup_eip", None, provider,
                              skip_network))

    def eip_cancel_setup(self):
        """
        Cancel the ongoing setup EIP (if any).
        """
        self._call_queue.put(("eip", "cancel_setup_eip", None))

    def eip_start(self, restart=False):
        """
        Start the EIP service.

        Signals:
            backend_bad_call
            eip_alien_openvpn_already_running
            eip_connected
            eip_connection_aborted
            eip_network_unreachable
            eip_no_pkexec_error
            eip_no_polkit_agent_error
            eip_no_tun_kext_error
            eip_openvpn_already_running
            eip_openvpn_not_found_error
            eip_process_finished
            eip_process_restart_ping
            eip_process_restart_tls
            eip_state_changed -> str
            eip_status_changed -> tuple of str (download, upload)
            eip_vpn_launcher_exception

        :param restart: whether is is a restart.
        :type restart: bool
        """
        self._call_queue.put(("eip", "start", None, restart))

    def eip_stop(self, shutdown=False, restart=False, failed=False):
        """
        Stop the EIP service.

        :param shutdown: whether this is the final shutdown.
        :type shutdown: bool

        :param restart: whether this is part of a restart.
        :type restart: bool
        """
        self._call_queue.put(("eip", "stop", None, shutdown, restart))

    def eip_terminate(self):
        """
        Terminate the EIP service, not necessarily in a nice way.
        """
        self._call_queue.put(("eip", "terminate", None))

    def eip_get_gateways_list(self, domain):
        """
        Signal a list of gateways for the given provider.

        :param domain: the domain to get the gateways.
        :type domain: str

        # TODO discuss how to document the expected result object received of
        # the signal
        :signal type: list of str

        Signals:
            eip_get_gateways_list -> list of unicode
            eip_get_gateways_list_error
            eip_uninitialized_provider
        """
        self._call_queue.put(("eip", "get_gateways_list", None, domain))

    def eip_get_initialized_providers(self, domains):
        """
        Signal a list of the given domains and if they are initialized or not.

        :param domains: the list of domains to check.
        :type domain: list of str

        Signals:
            eip_get_initialized_providers -> list of tuple(unicode, bool)

        """
        self._call_queue.put(("eip", "get_initialized_providers",
                              None, domains))

    def eip_can_start(self, domain):
        """
        Signal whether it has everything that is needed to run EIP or not

        :param domain: the domain for the provider to check
        :type domain: str

        Signals:
            eip_can_start
            eip_cannot_start
        """
        self._call_queue.put(("eip", "can_start",
                              None, domain))

    def eip_check_dns(self, domain):
        """
        Check if we can resolve the given domain name.

        :param domain: the domain for the provider to check
        :type domain: str

        Signals:
            eip_dns_ok
            eip_dns_error
        """
        self._call_queue.put(("eip", "check_dns", None, domain))

    def tear_fw_down(self):
        """
        Signal the need to tear the fw down.
        """
        self._call_queue.put(("eip", "tear_fw_down", None))

    def user_login(self, provider, username, password):
        """
        Execute the whole authentication process for a user

        :param domain: the domain where we need to authenticate.
        :type domain: unicode
        :param username: username for this session
        :type username: str
        :param password: password for this user
        :type password: str

        Signals:
            srp_auth_error
            srp_auth_ok
            srp_auth_bad_user_or_password
            srp_auth_server_error
            srp_auth_connection_error
            srp_auth_error
        """
        self._call_queue.put(("authenticate", "login", None, provider,
                              username, password))

    def user_logout(self):
        """
        Log out the current session.

        Signals:
            srp_logout_ok
            srp_logout_error
            srp_not_logged_in_error
        """
        self._call_queue.put(("authenticate", "logout", None))

    def user_cancel_login(self):
        """
        Cancel the ongoing login (if any).
        """
        self._call_queue.put(("authenticate", "cancel_login", None))

    def user_change_password(self, current_password, new_password):
        """
        Change the user's password.

        :param current_password: the current password of the user.
        :type current_password: str
        :param new_password: the new password for the user.
        :type new_password: str

        Signals:
            srp_not_logged_in_error
            srp_password_change_ok
            srp_password_change_badpw
            srp_password_change_error
        """
        self._call_queue.put(("authenticate", "change_password", None,
                              current_password, new_password))

    def soledad_change_password(self, new_password):
        """
        Change the database's password.

        :param new_password: the new password for the user.
        :type new_password: unicode

        Signals:
            srp_not_logged_in_error
            srp_password_change_ok
            srp_password_change_badpw
            srp_password_change_error
        """
        self._call_queue.put(("soledad", "change_password", None,
                              new_password))

    def user_get_logged_in_status(self):
        """
        Signal if the user is currently logged in or not.

        Signals:
            srp_status_logged_in
            srp_status_not_logged_in
        """
        self._call_queue.put(("authenticate", "get_logged_in_status", None))

    def soledad_bootstrap(self, username, domain, password):
        """
        Bootstrap the soledad database.

        :param username: the user name
        :type username: unicode
        :param domain: the domain that we are using.
        :type domain: unicode
        :param password: the password for the username
        :type password: unicode

        Signals:
            soledad_bootstrap_finished
            soledad_bootstrap_failed
            soledad_invalid_auth_token
        """
        self._call_queue.put(("soledad", "bootstrap", None,
                              username, domain, password))

    def soledad_load_offline(self, username, password, uuid):
        """
        Load the soledad database in offline mode.

        :param username: full user id (user@provider)
        :type username: str or unicode
        :param password: the soledad passphrase
        :type password: unicode
        :param uuid: the user uuid
        :type uuid: str or unicode

        Signals:
        """
        self._call_queue.put(("soledad", "load_offline", None,
                              username, password, uuid))

    def soledad_cancel_bootstrap(self):
        """
        Cancel the ongoing soledad bootstrapping process (if any).
        """
        self._call_queue.put(("soledad", "cancel_bootstrap", None))

    def soledad_close(self):
        """
        Close soledad database.
        """
        self._call_queue.put(("soledad", "close", None))

    def keymanager_list_keys(self):
        """
        Signal a list of public keys locally stored.

        Signals:
            keymanager_keys_list -> list
        """
        self._call_queue.put(("keymanager", "list_keys", None))

    def keymanager_export_keys(self, username, filename):
        """
        Export the given username's keys to a file.

        :param username: the username whos keys we need to export.
        :type username: str
        :param filename: the name of the file where we want to save the keys.
        :type filename: str

        Signals:
            keymanager_export_ok
            keymanager_export_error
        """
        self._call_queue.put(("keymanager", "export_keys", None,
                              username, filename))

    def keymanager_get_key_details(self, username):
        """
        Signal the given username's key details.

        :param username: the username whos keys we need to get details.
        :type username: str

        Signals:
            keymanager_key_details
        """
        self._call_queue.put(("keymanager", "get_key_details", None, username))

    def smtp_start_service(self, full_user_id, download_if_needed=False):
        """
        Start the SMTP service.

        :param full_user_id: user id, in the form "user@provider"
        :type full_user_id: str
        :param download_if_needed: True if it should check for mtime
                                   for the file
        :type download_if_needed: bool
        """
        self._call_queue.put(("mail", "start_smtp_service", None,
                              full_user_id, download_if_needed))

    def imap_start_service(self, full_user_id, offline=False):
        """
        Start the IMAP service.

        :param full_user_id: user id, in the form "user@provider"
        :type full_user_id: str
        :param offline: whether imap should start in offline mode or not.
        :type offline: bool
        """
        self._call_queue.put(("mail", "start_imap_service", None,
                              full_user_id, offline))

    def smtp_stop_service(self):
        """
        Stop the SMTP service.
        """
        self._call_queue.put(("mail", "stop_smtp_service", None))

    def imap_stop_service(self):
        """
        Stop imap service.

        Signals:
            imap_stopped
        """
        self._call_queue.put(("mail", "stop_imap_service", None))