summaryrefslogtreecommitdiffstats
path: root/security/nss/lib/pk11wrap/pk11util.c
blob: 502c4d00cb1cfbd38e4ea00d5c4943be7e33cc40 (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
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
 * Initialize the PCKS 11 subsystem
 */
#include "seccomon.h"
#include "secmod.h"
#include "nssilock.h"
#include "secmodi.h"
#include "secmodti.h"
#include "pk11func.h"
#include "pki3hack.h"
#include "secerr.h"
#include "dev.h"
#include "utilpars.h"
#include "pkcs11uri.h"

/* these are for displaying error messages */

static SECMODModuleList *modules = NULL;
static SECMODModuleList *modulesDB = NULL;
static SECMODModuleList *modulesUnload = NULL;
static SECMODModule *internalModule = NULL;
static SECMODModule *defaultDBModule = NULL;
static SECMODModule *pendingModule = NULL;
static SECMODListLock *moduleLock = NULL;

int secmod_PrivateModuleCount = 0;

extern const PK11DefaultArrayEntry PK11_DefaultArray[];
extern const int num_pk11_default_mechanisms;

void
SECMOD_Init()
{
    /* don't initialize twice */
    if (moduleLock)
        return;

    moduleLock = SECMOD_NewListLock();
    PK11_InitSlotLists();
}

SECStatus
SECMOD_Shutdown()
{
    /* destroy the lock */
    if (moduleLock) {
        SECMOD_DestroyListLock(moduleLock);
        moduleLock = NULL;
    }
    /* free the internal module */
    if (internalModule) {
        SECMOD_DestroyModule(internalModule);
        internalModule = NULL;
    }

    /* free the default database module */
    if (defaultDBModule) {
        SECMOD_DestroyModule(defaultDBModule);
        defaultDBModule = NULL;
    }

    /* destroy the list */
    if (modules) {
        SECMOD_DestroyModuleList(modules);
        modules = NULL;
    }

    if (modulesDB) {
        SECMOD_DestroyModuleList(modulesDB);
        modulesDB = NULL;
    }

    if (modulesUnload) {
        SECMOD_DestroyModuleList(modulesUnload);
        modulesUnload = NULL;
    }

    /* make all the slots and the lists go away */
    PK11_DestroySlotLists();

    nss_DumpModuleLog();

#ifdef DEBUG
    if (PR_GetEnvSecure("NSS_STRICT_SHUTDOWN")) {
        PORT_Assert(secmod_PrivateModuleCount == 0);
    }
#endif
    if (secmod_PrivateModuleCount) {
        PORT_SetError(SEC_ERROR_BUSY);
        return SECFailure;
    }
    return SECSuccess;
}

int
secmod_GetSystemFIPSEnabled(void)
{
#ifdef LINUX
    FILE *f;
    char d;
    size_t size;

    f = fopen("/proc/sys/crypto/fips_enabled", "r");
    if (!f) {
        return 0;
    }

    size = fread(&d, 1, sizeof(d), f);
    fclose(f);
    if (size != sizeof(d)) {
        return 0;
    }
    if (d == '1') {
        return 1;
    }
#endif
    return 0;
}

/*
 * retrieve the internal module
 */
SECMODModule *
SECMOD_GetInternalModule(void)
{
    return internalModule;
}

SECStatus
secmod_AddModuleToList(SECMODModuleList **moduleList, SECMODModule *newModule)
{
    SECMODModuleList *mlp, *newListElement, *last = NULL;

    newListElement = SECMOD_NewModuleListElement();
    if (newListElement == NULL) {
        return SECFailure;
    }

    newListElement->module = SECMOD_ReferenceModule(newModule);

    SECMOD_GetWriteLock(moduleLock);
    /* Added it to the end (This is very inefficient, but Adding a module
     * on the fly should happen maybe 2-3 times through the life this program
     * on a given computer, and this list should be *SHORT*. */
    for (mlp = *moduleList; mlp != NULL; mlp = mlp->next) {
        last = mlp;
    }

    if (last == NULL) {
        *moduleList = newListElement;
    } else {
        SECMOD_AddList(last, newListElement, NULL);
    }
    SECMOD_ReleaseWriteLock(moduleLock);
    return SECSuccess;
}

SECStatus
SECMOD_AddModuleToList(SECMODModule *newModule)
{
    if (newModule->internal && !internalModule) {
        internalModule = SECMOD_ReferenceModule(newModule);
    }
    return secmod_AddModuleToList(&modules, newModule);
}

SECStatus
SECMOD_AddModuleToDBOnlyList(SECMODModule *newModule)
{
    if (defaultDBModule && SECMOD_GetDefaultModDBFlag(newModule)) {
        SECMOD_DestroyModule(defaultDBModule);
        defaultDBModule = SECMOD_ReferenceModule(newModule);
    } else if (defaultDBModule == NULL) {
        defaultDBModule = SECMOD_ReferenceModule(newModule);
    }
    return secmod_AddModuleToList(&modulesDB, newModule);
}

SECStatus
SECMOD_AddModuleToUnloadList(SECMODModule *newModule)
{
    return secmod_AddModuleToList(&modulesUnload, newModule);
}

/*
 * get the list of PKCS11 modules that are available.
 */
SECMODModuleList *
SECMOD_GetDefaultModuleList()
{
    return modules;
}
SECMODModuleList *
SECMOD_GetDeadModuleList()
{
    return modulesUnload;
}
SECMODModuleList *
SECMOD_GetDBModuleList()
{
    return modulesDB;
}

/*
 * This lock protects the global module lists.
 * it also protects changes to the slot array (module->slots[]) and slot count
 * (module->slotCount) in each module. It is a read/write lock with multiple
 * readers or one writer. Writes are uncommon.
 * Because of legacy considerations protection of the slot array and count is
 * only necessary in applications if the application calls
 * SECMOD_UpdateSlotList() or SECMOD_WaitForAnyTokenEvent(), though all new
 * applications are encouraged to acquire this lock when reading the
 * slot array information directly.
 */
SECMODListLock *
SECMOD_GetDefaultModuleListLock()
{
    return moduleLock;
}

/*
 * find a module by name, and add a reference to it.
 * return that module.
 */
SECMODModule *
SECMOD_FindModule(const char *name)
{
    SECMODModuleList *mlp;
    SECMODModule *module = NULL;

    if (!moduleLock) {
        PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
        return module;
    }
    SECMOD_GetReadLock(moduleLock);
    for (mlp = modules; mlp != NULL; mlp = mlp->next) {
        if (PORT_Strcmp(name, mlp->module->commonName) == 0) {
            module = mlp->module;
            SECMOD_ReferenceModule(module);
            break;
        }
    }
    if (module) {
        goto found;
    }
    for (mlp = modulesUnload; mlp != NULL; mlp = mlp->next) {
        if (PORT_Strcmp(name, mlp->module->commonName) == 0) {
            module = mlp->module;
            SECMOD_ReferenceModule(module);
            break;
        }
    }

found:
    SECMOD_ReleaseReadLock(moduleLock);

    return module;
}

/*
 * find a module by ID, and add a reference to it.
 * return that module.
 */
SECMODModule *
SECMOD_FindModuleByID(SECMODModuleID id)
{
    SECMODModuleList *mlp;
    SECMODModule *module = NULL;

    if (!moduleLock) {
        PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
        return module;
    }
    SECMOD_GetReadLock(moduleLock);
    for (mlp = modules; mlp != NULL; mlp = mlp->next) {
        if (id == mlp->module->moduleID) {
            module = mlp->module;
            SECMOD_ReferenceModule(module);
            break;
        }
    }
    SECMOD_ReleaseReadLock(moduleLock);
    if (module == NULL) {
        PORT_SetError(SEC_ERROR_NO_MODULE);
    }
    return module;
}

/*
 * find the function pointer.
 */
SECMODModule *
secmod_FindModuleByFuncPtr(void *funcPtr)
{
    SECMODModuleList *mlp;
    SECMODModule *module = NULL;

    SECMOD_GetReadLock(moduleLock);
    for (mlp = modules; mlp != NULL; mlp = mlp->next) {
        /* paranoia, shouldn't ever happen */
        if (!mlp->module) {
            continue;
        }
        if (funcPtr == mlp->module->functionList) {
            module = mlp->module;
            SECMOD_ReferenceModule(module);
            break;
        }
    }
    SECMOD_ReleaseReadLock(moduleLock);
    if (module == NULL) {
        PORT_SetError(SEC_ERROR_NO_MODULE);
    }
    return module;
}

/*
 * Find the Slot based on ID and the module.
 */
PK11SlotInfo *
SECMOD_FindSlotByID(SECMODModule *module, CK_SLOT_ID slotID)
{
    int i;
    PK11SlotInfo *slot = NULL;

    if (!moduleLock) {
        PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
        return slot;
    }
    SECMOD_GetReadLock(moduleLock);
    for (i = 0; i < module->slotCount; i++) {
        PK11SlotInfo *cSlot = module->slots[i];

        if (cSlot->slotID == slotID) {
            slot = PK11_ReferenceSlot(cSlot);
            break;
        }
    }
    SECMOD_ReleaseReadLock(moduleLock);

    if (slot == NULL) {
        PORT_SetError(SEC_ERROR_NO_SLOT_SELECTED);
    }
    return slot;
}

/*
 * lookup the Slot module based on it's module ID and slot ID.
 */
PK11SlotInfo *
SECMOD_LookupSlot(SECMODModuleID moduleID, CK_SLOT_ID slotID)
{
    SECMODModule *module;
    PK11SlotInfo *slot;

    module = SECMOD_FindModuleByID(moduleID);
    if (module == NULL)
        return NULL;

    slot = SECMOD_FindSlotByID(module, slotID);
    SECMOD_DestroyModule(module);
    return slot;
}

/*
 * find a module by name or module pointer and delete it off the module list.
 * optionally remove it from secmod.db.
 */
SECStatus
SECMOD_DeleteModuleEx(const char *name, SECMODModule *mod,
                      int *type, PRBool permdb)
{
    SECMODModuleList *mlp;
    SECMODModuleList **mlpp;
    SECStatus rv = SECFailure;

    if (!moduleLock) {
        PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
        return rv;
    }

    *type = SECMOD_EXTERNAL;

    SECMOD_GetWriteLock(moduleLock);
    for (mlpp = &modules, mlp = modules;
         mlp != NULL; mlpp = &mlp->next, mlp = *mlpp) {
        if ((name && (PORT_Strcmp(name, mlp->module->commonName) == 0)) ||
            mod == mlp->module) {
            /* don't delete the internal module */
            if (!mlp->module->internal) {
                SECMOD_RemoveList(mlpp, mlp);
                /* delete it after we release the lock */
                rv = STAN_RemoveModuleFromDefaultTrustDomain(mlp->module);
            } else if (mlp->module->isFIPS) {
                *type = SECMOD_FIPS;
            } else {
                *type = SECMOD_INTERNAL;
            }
            break;
        }
    }
    if (mlp) {
        goto found;
    }
    /* not on the internal list, check the unload list */
    for (mlpp = &modulesUnload, mlp = modulesUnload;
         mlp != NULL; mlpp = &mlp->next, mlp = *mlpp) {
        if ((name && (PORT_Strcmp(name, mlp->module->commonName) == 0)) ||
            mod == mlp->module) {
            /* don't delete the internal module */
            if (!mlp->module->internal) {
                SECMOD_RemoveList(mlpp, mlp);
                rv = SECSuccess;
            } else if (mlp->module->isFIPS) {
                *type = SECMOD_FIPS;
            } else {
                *type = SECMOD_INTERNAL;
            }
            break;
        }
    }
found:
    SECMOD_ReleaseWriteLock(moduleLock);

    if (rv == SECSuccess) {
        if (permdb) {
            SECMOD_DeletePermDB(mlp->module);
        }
        SECMOD_DestroyModuleListElement(mlp);
    }
    return rv;
}

/*
 * find a module by name and delete it off the module list
 */
SECStatus
SECMOD_DeleteModule(const char *name, int *type)
{
    return SECMOD_DeleteModuleEx(name, NULL, type, PR_TRUE);
}

/*
 * find a module by name and delete it off the module list
 */
SECStatus
SECMOD_DeleteInternalModule(const char *name)
{
    SECMODModuleList *mlp;
    SECMODModuleList **mlpp;
    SECStatus rv = SECFailure;

    if (secmod_GetSystemFIPSEnabled() || pendingModule) {
        PORT_SetError(SEC_ERROR_MODULE_STUCK);
        return rv;
    }
    if (!moduleLock) {
        PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
        return rv;
    }

#ifdef NSS_FIPS_DISABLED
    PORT_SetError(PR_OPERATION_NOT_SUPPORTED_ERROR);
    return rv;
#endif

    SECMOD_GetWriteLock(moduleLock);
    for (mlpp = &modules, mlp = modules;
         mlp != NULL; mlpp = &mlp->next, mlp = *mlpp) {
        if (PORT_Strcmp(name, mlp->module->commonName) == 0) {
            /* don't delete the internal module */
            if (mlp->module->internal) {
                SECMOD_RemoveList(mlpp, mlp);
                rv = STAN_RemoveModuleFromDefaultTrustDomain(mlp->module);
            }
            break;
        }
    }
    SECMOD_ReleaseWriteLock(moduleLock);

    if (rv == SECSuccess) {
        SECMODModule *newModule, *oldModule;

        if (mlp->module->isFIPS) {
            newModule = SECMOD_CreateModule(NULL, SECMOD_INT_NAME,
                                            NULL, SECMOD_INT_FLAGS);
        } else {
            newModule = SECMOD_CreateModule(NULL, SECMOD_FIPS_NAME,
                                            NULL, SECMOD_FIPS_FLAGS);
        }
        if (newModule) {
            PK11SlotInfo *slot;
            newModule->libraryParams =
                PORT_ArenaStrdup(newModule->arena, mlp->module->libraryParams);
            /* if an explicit internal key slot has been set, reset it */
            slot = pk11_SwapInternalKeySlot(NULL);
            if (slot) {
                secmod_SetInternalKeySlotFlag(newModule, PR_TRUE);
            }
            rv = SECMOD_AddModule(newModule);
            if (rv != SECSuccess) {
                /* load failed, restore the internal key slot */
                pk11_SetInternalKeySlot(slot);
                SECMOD_DestroyModule(newModule);
                newModule = NULL;
            }
            /* free the old explicit internal key slot, we now have a new one */
            if (slot) {
                PK11_FreeSlot(slot);
            }
        }
        if (newModule == NULL) {
            SECMODModuleList *last = NULL, *mlp2;
            /* we're in pretty deep trouble if this happens...Security
             * not going to work well... try to put the old module back on
             * the list */
            SECMOD_GetWriteLock(moduleLock);
            for (mlp2 = modules; mlp2 != NULL; mlp2 = mlp->next) {
                last = mlp2;
            }

            if (last == NULL) {
                modules = mlp;
            } else {
                SECMOD_AddList(last, mlp, NULL);
            }
            SECMOD_ReleaseWriteLock(moduleLock);
            return SECFailure;
        }
        pendingModule = oldModule = internalModule;
        internalModule = NULL;
        SECMOD_DestroyModule(oldModule);
        SECMOD_DeletePermDB(mlp->module);
        SECMOD_DestroyModuleListElement(mlp);
        internalModule = newModule; /* adopt the module */
    }
    return rv;
}

SECStatus
SECMOD_AddModule(SECMODModule *newModule)
{
    SECStatus rv;
    SECMODModule *oldModule;

    /* Test if a module w/ the same name already exists */
    /* and return SECWouldBlock if so. */
    /* We should probably add a new return value such as */
    /* SECDublicateModule, but to minimize ripples, I'll */
    /* give SECWouldBlock a new meaning */
    if ((oldModule = SECMOD_FindModule(newModule->commonName)) != NULL) {
        SECMOD_DestroyModule(oldModule);
        return SECWouldBlock;
        /* module already exists. */
    }

    rv = secmod_LoadPKCS11Module(newModule, NULL);
    if (rv != SECSuccess) {
        return rv;
    }

    if (newModule->parent == NULL) {
        newModule->parent = SECMOD_ReferenceModule(defaultDBModule);
    }

    SECMOD_AddPermDB(newModule);
    SECMOD_AddModuleToList(newModule);

    rv = STAN_AddModuleToDefaultTrustDomain(newModule);

    return rv;
}

PK11SlotInfo *
SECMOD_FindSlot(SECMODModule *module, const char *name)
{
    int i;
    char *string;
    PK11SlotInfo *retSlot = NULL;

    if (!moduleLock) {
        PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
        return retSlot;
    }
    SECMOD_GetReadLock(moduleLock);
    for (i = 0; i < module->slotCount; i++) {
        PK11SlotInfo *slot = module->slots[i];

        if (PK11_IsPresent(slot)) {
            string = PK11_GetTokenName(slot);
        } else {
            string = PK11_GetSlotName(slot);
        }
        if (PORT_Strcmp(name, string) == 0) {
            retSlot = PK11_ReferenceSlot(slot);
            break;
        }
    }
    SECMOD_ReleaseReadLock(moduleLock);

    if (retSlot == NULL) {
        PORT_SetError(SEC_ERROR_NO_SLOT_SELECTED);
    }
    return retSlot;
}

SECStatus
PK11_GetModInfo(SECMODModule *mod, CK_INFO *info)
{
    CK_RV crv;

    if (mod->functionList == NULL)
        return SECFailure;
    crv = PK11_GETTAB(mod)->C_GetInfo(info);
    if (crv != CKR_OK) {
        PORT_SetError(PK11_MapError(crv));
    }
    return (crv == CKR_OK) ? SECSuccess : SECFailure;
}

char *
PK11_GetModuleURI(SECMODModule *mod)
{
    CK_INFO info;
    PK11URI *uri;
    char *ret = NULL;
    PK11URIAttribute attrs[3];
    size_t nattrs = 0;
    char libraryManufacturer[32 + 1], libraryDescription[32 + 1], libraryVersion[8];

    if (PK11_GetModInfo(mod, &info) == SECFailure) {
        return NULL;
    }

    PK11_MakeString(NULL, libraryManufacturer, (char *)info.manufacturerID,
                    sizeof(info.manufacturerID));
    if (*libraryManufacturer != '\0') {
        attrs[nattrs].name = PK11URI_PATTR_LIBRARY_MANUFACTURER;
        attrs[nattrs].value = libraryManufacturer;
        nattrs++;
    }

    PK11_MakeString(NULL, libraryDescription, (char *)info.libraryDescription,
                    sizeof(info.libraryDescription));
    if (*libraryDescription != '\0') {
        attrs[nattrs].name = PK11URI_PATTR_LIBRARY_DESCRIPTION;
        attrs[nattrs].value = libraryDescription;
        nattrs++;
    }

    PR_snprintf(libraryVersion, sizeof(libraryVersion), "%d.%d",
                info.libraryVersion.major, info.libraryVersion.minor);
    attrs[nattrs].name = PK11URI_PATTR_LIBRARY_VERSION;
    attrs[nattrs].value = libraryVersion;
    nattrs++;

    uri = PK11URI_CreateURI(attrs, nattrs, NULL, 0);
    if (uri == NULL) {
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return NULL;
    }

    ret = PK11URI_FormatURI(NULL, uri);
    PK11URI_DestroyURI(uri);
    if (ret == NULL) {
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return NULL;
    }

    return ret;
}

/* Determine if we have the FIP's module loaded as the default
 * module to trigger other bogus FIPS requirements in PKCS #12 and
 * SSL
 */
PRBool
PK11_IsFIPS(void)
{
    SECMODModule *mod = SECMOD_GetInternalModule();

    if (mod && mod->internal) {
        return mod->isFIPS;
    }

    return PR_FALSE;
}

/* combines NewModule() & AddModule */
/* give a string for the module name & the full-path for the dll, */
/* installs the PKCS11 module & update registry */
SECStatus
SECMOD_AddNewModuleEx(const char *moduleName, const char *dllPath,
                      unsigned long defaultMechanismFlags,
                      unsigned long cipherEnableFlags,
                      char *modparms, char *nssparms)
{
    SECMODModule *module;
    SECStatus result = SECFailure;
    int s, i;
    PK11SlotInfo *slot;

    PR_SetErrorText(0, NULL);
    if (!moduleLock) {
        PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
        return result;
    }

    module = SECMOD_CreateModule(dllPath, moduleName, modparms, nssparms);

    if (module == NULL) {
        return result;
    }

    if (module->dllName != NULL) {
        if (module->dllName[0] != 0) {
            result = SECMOD_AddModule(module);
            if (result == SECSuccess) {
                /* turn on SSL cipher enable flags */
                module->ssl[0] = cipherEnableFlags;

                SECMOD_GetReadLock(moduleLock);
                /* check each slot to turn on appropriate mechanisms */
                for (s = 0; s < module->slotCount; s++) {
                    slot = (module->slots)[s];
                    /* for each possible mechanism */
                    for (i = 0; i < num_pk11_default_mechanisms; i++) {
                        /* we are told to turn it on by default ? */
                        PRBool add =
                            (PK11_DefaultArray[i].flag & defaultMechanismFlags) ? PR_TRUE : PR_FALSE;
                        result = PK11_UpdateSlotAttribute(slot,
                                                          &(PK11_DefaultArray[i]), add);
                        if (result != SECSuccess) {
                            SECMOD_ReleaseReadLock(moduleLock);
                            SECMOD_DestroyModule(module);
                            return result;
                        }
                    } /* for each mechanism */
                    /* disable each slot if the defaultFlags say so */
                    if (defaultMechanismFlags & PK11_DISABLE_FLAG) {
                        PK11_UserDisableSlot(slot);
                    }
                } /* for each slot of this module */
                SECMOD_ReleaseReadLock(moduleLock);

                /* delete and re-add module in order to save changes
                 * to the module */
                result = SECMOD_UpdateModule(module);
            }
        }
    }
    SECMOD_DestroyModule(module);
    return result;
}

SECStatus
SECMOD_AddNewModule(const char *moduleName, const char *dllPath,
                    unsigned long defaultMechanismFlags,
                    unsigned long cipherEnableFlags)
{
    return SECMOD_AddNewModuleEx(moduleName, dllPath, defaultMechanismFlags,
                                 cipherEnableFlags,
                                 NULL, NULL); /* don't pass module or nss params */
}

SECStatus
SECMOD_UpdateModule(SECMODModule *module)
{
    SECStatus result;

    result = SECMOD_DeletePermDB(module);

    if (result == SECSuccess) {
        result = SECMOD_AddPermDB(module);
    }
    return result;
}

/* Public & Internal(Security Library)  representation of
 * encryption mechanism flags conversion */

/* Currently, the only difference is that internal representation
 * puts RANDOM_FLAG at bit 31 (Most-significant bit), but
 * public representation puts this bit at bit 28
 */
unsigned long
SECMOD_PubMechFlagstoInternal(unsigned long publicFlags)
{
    unsigned long internalFlags = publicFlags;

    if (publicFlags & PUBLIC_MECH_RANDOM_FLAG) {
        internalFlags &= ~PUBLIC_MECH_RANDOM_FLAG;
        internalFlags |= SECMOD_RANDOM_FLAG;
    }
    return internalFlags;
}

unsigned long
SECMOD_InternaltoPubMechFlags(unsigned long internalFlags)
{
    unsigned long publicFlags = internalFlags;

    if (internalFlags & SECMOD_RANDOM_FLAG) {
        publicFlags &= ~SECMOD_RANDOM_FLAG;
        publicFlags |= PUBLIC_MECH_RANDOM_FLAG;
    }
    return publicFlags;
}

/* Public & Internal(Security Library)  representation of */
/* cipher flags conversion */
/* Note: currently they are just stubs */
unsigned long
SECMOD_PubCipherFlagstoInternal(unsigned long publicFlags)
{
    return publicFlags;
}

unsigned long
SECMOD_InternaltoPubCipherFlags(unsigned long internalFlags)
{
    return internalFlags;
}

/* Funtion reports true if module of modType is installed/configured */
PRBool
SECMOD_IsModulePresent(unsigned long int pubCipherEnableFlags)
{
    PRBool result = PR_FALSE;
    SECMODModuleList *mods;

    if (!moduleLock) {
        PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
        return result;
    }
    SECMOD_GetReadLock(moduleLock);
    mods = SECMOD_GetDefaultModuleList();
    for (; mods != NULL; mods = mods->next) {
        if (mods->module->ssl[0] &
            SECMOD_PubCipherFlagstoInternal(pubCipherEnableFlags)) {
            result = PR_TRUE;
        }
    }

    SECMOD_ReleaseReadLock(moduleLock);
    return result;
}

/* create a new ModuleListElement */
SECMODModuleList *
SECMOD_NewModuleListElement(void)
{
    SECMODModuleList *newModList;

    newModList = (SECMODModuleList *)PORT_Alloc(sizeof(SECMODModuleList));
    if (newModList) {
        newModList->next = NULL;
        newModList->module = NULL;
    }
    return newModList;
}

/*
 * make a new reference to a module so It doesn't go away on us
 */
SECMODModule *
SECMOD_ReferenceModule(SECMODModule *module)
{
    PZ_Lock(module->refLock);
    PORT_Assert(module->refCount > 0);

    module->refCount++;
    PZ_Unlock(module->refLock);
    return module;
}

/* destroy an existing module */
void
SECMOD_DestroyModule(SECMODModule *module)
{
    PRBool willfree = PR_FALSE;
    int slotCount;
    int i;

    PZ_Lock(module->refLock);
    if (module->refCount-- == 1) {
        willfree = PR_TRUE;
    }
    PORT_Assert(willfree || (module->refCount > 0));
    PZ_Unlock(module->refLock);

    if (!willfree) {
        return;
    }

    if (module->parent != NULL) {
        SECMODModule *parent = module->parent;
        /* paranoia, don't loop forever if the modules are looped */
        module->parent = NULL;
        SECMOD_DestroyModule(parent);
    }

    /* slots can't really disappear until our module starts freeing them,
     * so this check is safe */
    slotCount = module->slotCount;
    if (slotCount == 0) {
        SECMOD_SlotDestroyModule(module, PR_FALSE);
        return;
    }

    /* now free all out slots, when they are done, they will cause the
     * module to disappear altogether */
    for (i = 0; i < slotCount; i++) {
        if (!module->slots[i]->disabled) {
            PK11_ClearSlotList(module->slots[i]);
        }
        PK11_FreeSlot(module->slots[i]);
    }
    /* WARNING: once the last slot has been freed is it possible (even likely)
     * that module is no more... touching it now is a good way to go south */
}

/* we can only get here if we've destroyed the module, or some one has
 * erroneously freed a slot that wasn't referenced. */
void
SECMOD_SlotDestroyModule(SECMODModule *module, PRBool fromSlot)
{
    PRBool willfree = PR_FALSE;
    if (fromSlot) {
        PORT_Assert(module->refCount == 0);
        PZ_Lock(module->refLock);
        if (module->slotCount-- == 1) {
            willfree = PR_TRUE;
        }
        PORT_Assert(willfree || (module->slotCount > 0));
        PZ_Unlock(module->refLock);
        if (!willfree)
            return;
    }

    if (module == pendingModule) {
        pendingModule = NULL;
    }

    if (module->loaded) {
        SECMOD_UnloadModule(module);
    }
    PZ_DestroyLock(module->refLock);
    PORT_FreeArena(module->arena, PR_FALSE);
    secmod_PrivateModuleCount--;
}

/* destroy a list element
 * this destroys a single element, and returns the next element
 * on the chain. It makes it easy to implement for loops to delete
 * the chain. It also make deleting a single element easy */
SECMODModuleList *
SECMOD_DestroyModuleListElement(SECMODModuleList *element)
{
    SECMODModuleList *next = element->next;

    if (element->module) {
        SECMOD_DestroyModule(element->module);
        element->module = NULL;
    }
    PORT_Free(element);
    return next;
}

/*
 * Destroy an entire module list
 */
void
SECMOD_DestroyModuleList(SECMODModuleList *list)
{
    SECMODModuleList *lp;

    for (lp = list; lp != NULL; lp = SECMOD_DestroyModuleListElement(lp))
        ;
}

PRBool
SECMOD_CanDeleteInternalModule(void)
{
#ifdef NSS_FIPS_DISABLED
    return PR_FALSE;
#else
    return (PRBool)((pendingModule == NULL) && !secmod_GetSystemFIPSEnabled());
#endif
}

/*
 * check to see if the module has added new slots. PKCS 11 v2.20 allows for
 * modules to add new slots, but never remove them. Slots cannot be added
 * between a call to C_GetSlotLlist(Flag, NULL, &count) and the subsequent
 * C_GetSlotList(flag, &data, &count) so that the array doesn't accidently
 * grow on the caller. It is permissible for the slots to increase between
 * successive calls with NULL to get the size.
 */
SECStatus
SECMOD_UpdateSlotList(SECMODModule *mod)
{
    CK_RV crv;
    CK_ULONG count;
    CK_ULONG i, oldCount;
    PRBool freeRef = PR_FALSE;
    void *mark = NULL;
    CK_ULONG *slotIDs = NULL;
    PK11SlotInfo **newSlots = NULL;
    PK11SlotInfo **oldSlots = NULL;

    if (!moduleLock) {
        PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
        return SECFailure;
    }

    /* C_GetSlotList is not a session function, make sure
     * calls are serialized */
    PZ_Lock(mod->refLock);
    freeRef = PR_TRUE;
    /* see if the number of slots have changed */
    crv = PK11_GETTAB(mod)->C_GetSlotList(PR_FALSE, NULL, &count);
    if (crv != CKR_OK) {
        PORT_SetError(PK11_MapError(crv));
        goto loser;
    }
    /* nothing new, blow out early, we want this function to be quick
     * and cheap in the normal case  */
    if (count == mod->slotCount) {
        PZ_Unlock(mod->refLock);
        return SECSuccess;
    }
    if (count < (CK_ULONG)mod->slotCount) {
        /* shouldn't happen with a properly functioning PKCS #11 module */
        PORT_SetError(SEC_ERROR_INCOMPATIBLE_PKCS11);
        goto loser;
    }

    /* get the new slot list */
    slotIDs = PORT_NewArray(CK_SLOT_ID, count);
    if (slotIDs == NULL) {
        goto loser;
    }

    crv = PK11_GETTAB(mod)->C_GetSlotList(PR_FALSE, slotIDs, &count);
    if (crv != CKR_OK) {
        PORT_SetError(PK11_MapError(crv));
        goto loser;
    }
    freeRef = PR_FALSE;
    PZ_Unlock(mod->refLock);
    mark = PORT_ArenaMark(mod->arena);
    if (mark == NULL) {
        goto loser;
    }
    newSlots = PORT_ArenaZNewArray(mod->arena, PK11SlotInfo *, count);

    /* walk down the new slot ID list returned from the module. We keep
     * the old slots which match a returned ID, and we initialize the new
     * slots. */
    for (i = 0; i < count; i++) {
        PK11SlotInfo *slot = SECMOD_FindSlotByID(mod, slotIDs[i]);

        if (!slot) {
            /* we have a new slot create a new slot data structure */
            slot = PK11_NewSlotInfo(mod);
            if (!slot) {
                goto loser;
            }
            PK11_InitSlot(mod, slotIDs[i], slot);
            STAN_InitTokenForSlotInfo(NULL, slot);
        }
        newSlots[i] = slot;
    }
    STAN_ResetTokenInterator(NULL);
    PORT_Free(slotIDs);
    slotIDs = NULL;
    PORT_ArenaUnmark(mod->arena, mark);

    /* until this point we're still using the old slot list. Now we update
     * module slot list. We update the slots (array) first then the count,
     * since we've already guarrenteed that count has increased (just in case
     * someone is looking at the slots field of  module without holding the
     * moduleLock */
    SECMOD_GetWriteLock(moduleLock);
    oldCount = mod->slotCount;
    oldSlots = mod->slots;
    mod->slots = newSlots; /* typical arena 'leak'... old mod->slots is
                            * allocated out of the module arena and won't
                            * be freed until the module is freed */
    mod->slotCount = count;
    SECMOD_ReleaseWriteLock(moduleLock);
    /* free our old references before forgetting about oldSlot*/
    for (i = 0; i < oldCount; i++) {
        PK11_FreeSlot(oldSlots[i]);
    }
    return SECSuccess;

loser:
    if (freeRef) {
        PZ_Unlock(mod->refLock);
    }
    if (slotIDs) {
        PORT_Free(slotIDs);
    }
    /* free all the slots we allocated. newSlots are part of the
     * mod arena. NOTE: the newSlots array contain both new and old
     * slots, but we kept a reference to the old slots when we built the new
     * array, so we need to free all the slots in newSlots array. */
    if (newSlots) {
        for (i = 0; i < count; i++) {
            if (newSlots[i] == NULL) {
                break; /* hit the last one */
            }
            PK11_FreeSlot(newSlots[i]);
        }
    }
    /* must come after freeing newSlots */
    if (mark) {
        PORT_ArenaRelease(mod->arena, mark);
    }
    return SECFailure;
}

/*
 * this handles modules that do not support C_WaitForSlotEvent().
 * The internal flags are stored. Note that C_WaitForSlotEvent() does not
 * have a timeout, so we don't have one for handleWaitForSlotEvent() either.
 */
PK11SlotInfo *
secmod_HandleWaitForSlotEvent(SECMODModule *mod, unsigned long flags,
                              PRIntervalTime latency)
{
    PRBool removableSlotsFound = PR_FALSE;
    int i;
    int error = SEC_ERROR_NO_EVENT;

    if (!moduleLock) {
        PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
        return NULL;
    }
    PZ_Lock(mod->refLock);
    if (mod->evControlMask & SECMOD_END_WAIT) {
        mod->evControlMask &= ~SECMOD_END_WAIT;
        PZ_Unlock(mod->refLock);
        PORT_SetError(SEC_ERROR_NO_EVENT);
        return NULL;
    }
    mod->evControlMask |= SECMOD_WAIT_SIMULATED_EVENT;
    while (mod->evControlMask & SECMOD_WAIT_SIMULATED_EVENT) {
        PZ_Unlock(mod->refLock);
        /* now is a good time to see if new slots have been added */
        SECMOD_UpdateSlotList(mod);

        /* loop through all the slots on a module */
        SECMOD_GetReadLock(moduleLock);
        for (i = 0; i < mod->slotCount; i++) {
            PK11SlotInfo *slot = mod->slots[i];
            PRUint16 series;
            PRBool present;

            /* perm modules do not change */
            if (slot->isPerm) {
                continue;
            }
            removableSlotsFound = PR_TRUE;
            /* simulate the PKCS #11 module flags. are the flags different
             * from the last time we called? */
            series = slot->series;
            present = PK11_IsPresent(slot);
            if ((slot->flagSeries != series) || (slot->flagState != present)) {
                slot->flagState = present;
                slot->flagSeries = series;
                SECMOD_ReleaseReadLock(moduleLock);
                PZ_Lock(mod->refLock);
                mod->evControlMask &= ~SECMOD_END_WAIT;
                PZ_Unlock(mod->refLock);
                return PK11_ReferenceSlot(slot);
            }
        }
        SECMOD_ReleaseReadLock(moduleLock);
        /* if everything was perm modules, don't lock up forever */
        if ((mod->slotCount != 0) && !removableSlotsFound) {
            error = SEC_ERROR_NO_SLOT_SELECTED;
            PZ_Lock(mod->refLock);
            break;
        }
        if (flags & CKF_DONT_BLOCK) {
            PZ_Lock(mod->refLock);
            break;
        }
        PR_Sleep(latency);
        PZ_Lock(mod->refLock);
    }
    mod->evControlMask &= ~SECMOD_END_WAIT;
    PZ_Unlock(mod->refLock);
    PORT_SetError(error);
    return NULL;
}

/*
 * this function waits for a token event on any slot of a given module
 * This function should not be called from more than one thread of the
 * same process (though other threads can make other library calls
 * on this module while this call is blocked).
 */
PK11SlotInfo *
SECMOD_WaitForAnyTokenEvent(SECMODModule *mod, unsigned long flags,
                            PRIntervalTime latency)
{
    CK_SLOT_ID id;
    CK_RV crv;
    PK11SlotInfo *slot;

    if (!pk11_getFinalizeModulesOption() ||
        ((mod->cryptokiVersion.major == 2) &&
         (mod->cryptokiVersion.minor < 1))) {
        /* if we are sharing the module with other software in our
         * address space, we can't reliably use C_WaitForSlotEvent(),
         * and if the module is version 2.0, C_WaitForSlotEvent() doesn't
         * exist */
        return secmod_HandleWaitForSlotEvent(mod, flags, latency);
    }
    /* first the the PKCS #11 call */
    PZ_Lock(mod->refLock);
    if (mod->evControlMask & SECMOD_END_WAIT) {
        goto end_wait;
    }
    mod->evControlMask |= SECMOD_WAIT_PKCS11_EVENT;
    PZ_Unlock(mod->refLock);
    crv = PK11_GETTAB(mod)->C_WaitForSlotEvent(flags, &id, NULL);
    PZ_Lock(mod->refLock);
    mod->evControlMask &= ~SECMOD_WAIT_PKCS11_EVENT;
    /* if we are in end wait, short circuit now, don't even risk
     * going into secmod_HandleWaitForSlotEvent */
    if (mod->evControlMask & SECMOD_END_WAIT) {
        goto end_wait;
    }
    PZ_Unlock(mod->refLock);
    if (crv == CKR_FUNCTION_NOT_SUPPORTED) {
        /* module doesn't support that call, simulate it */
        return secmod_HandleWaitForSlotEvent(mod, flags, latency);
    }
    if (crv != CKR_OK) {
        /* we can get this error if finalize was called while we were
         * still running. This is the only way to force a C_WaitForSlotEvent()
         * to return in PKCS #11. In this case, just return that there
         * was no event. */
        if (crv == CKR_CRYPTOKI_NOT_INITIALIZED) {
            PORT_SetError(SEC_ERROR_NO_EVENT);
        } else {
            PORT_SetError(PK11_MapError(crv));
        }
        return NULL;
    }
    slot = SECMOD_FindSlotByID(mod, id);
    if (slot == NULL) {
        /* possibly a new slot that was added? */
        SECMOD_UpdateSlotList(mod);
        slot = SECMOD_FindSlotByID(mod, id);
    }
    /* if we are in the delay period for the "isPresent" call, reset
     * the delay since we know things have probably changed... */
    if (slot && slot->nssToken && slot->nssToken->slot) {
        nssSlot_ResetDelay(slot->nssToken->slot);
    }
    return slot;

/* must be called with the lock on. */
end_wait:
    mod->evControlMask &= ~SECMOD_END_WAIT;
    PZ_Unlock(mod->refLock);
    PORT_SetError(SEC_ERROR_NO_EVENT);
    return NULL;
}

/*
 * This function "wakes up" WaitForAnyTokenEvent. It's a pretty drastic
 * function, possibly bringing down the pkcs #11 module in question. This
 * should be OK because 1) it does reinitialize, and 2) it should only be
 * called when we are on our way to tear the whole system down anyway.
 */
SECStatus
SECMOD_CancelWait(SECMODModule *mod)
{
    unsigned long controlMask;
    SECStatus rv = SECSuccess;
    CK_RV crv;

    PZ_Lock(mod->refLock);
    mod->evControlMask |= SECMOD_END_WAIT;
    controlMask = mod->evControlMask;
    if (controlMask & SECMOD_WAIT_PKCS11_EVENT) {
        if (!pk11_getFinalizeModulesOption()) {
            /* can't get here unless pk11_getFinalizeModulesOption is set */
            PORT_Assert(0);
            PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
            rv = SECFailure;
            goto loser;
        }
        /* NOTE: this call will drop all transient keys, in progress
         * operations, and any authentication. This is the only documented
         * way to get WaitForSlotEvent to return. Also note: for non-thread
         * safe tokens, we need to hold the module lock, this is not yet at
         * system shutdown/startup time, so we need to protect these calls */
        crv = PK11_GETTAB(mod)->C_Finalize(NULL);
        /* ok, we slammed the module down, now we need to reinit it in case
         * we intend to use it again */
        if (CKR_OK == crv) {
            PRBool alreadyLoaded;
            secmod_ModuleInit(mod, NULL, &alreadyLoaded);
        } else {
            /* Finalized failed for some reason,  notify the application
             * so maybe it has a prayer of recovering... */
            PORT_SetError(PK11_MapError(crv));
            rv = SECFailure;
        }
    } else if (controlMask & SECMOD_WAIT_SIMULATED_EVENT) {
        mod->evControlMask &= ~SECMOD_WAIT_SIMULATED_EVENT;
        /* Simulated events will eventually timeout
         * and wake up in the loop */
    }
loser:
    PZ_Unlock(mod->refLock);
    return rv;
}

/*
 * check to see if the module has removable slots that we may need to
 * watch for.
 */
PRBool
SECMOD_HasRemovableSlots(SECMODModule *mod)
{
    int i;
    PRBool ret = PR_FALSE;

    if (!moduleLock) {
        PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
        return ret;
    }
    SECMOD_GetReadLock(moduleLock);
    for (i = 0; i < mod->slotCount; i++) {
        PK11SlotInfo *slot = mod->slots[i];
        /* perm modules are not inserted or removed */
        if (slot->isPerm) {
            continue;
        }
        ret = PR_TRUE;
        break;
    }
    if (mod->slotCount == 0) {
        ret = PR_TRUE;
    }
    SECMOD_ReleaseReadLock(moduleLock);
    return ret;
}

/*
 * helper function to actually create and destroy user defined slots
 */
static SECStatus
secmod_UserDBOp(PK11SlotInfo *slot, CK_OBJECT_CLASS objClass,
                const char *sendSpec)
{
    CK_OBJECT_HANDLE dummy;
    CK_ATTRIBUTE template[2];
    CK_ATTRIBUTE *attrs = template;
    CK_RV crv;

    PK11_SETATTRS(attrs, CKA_CLASS, &objClass, sizeof(objClass));
    attrs++;
    PK11_SETATTRS(attrs, CKA_NETSCAPE_MODULE_SPEC, (unsigned char *)sendSpec,
                  strlen(sendSpec) + 1);
    attrs++;

    PORT_Assert(attrs - template <= 2);

    PK11_EnterSlotMonitor(slot);
    crv = PK11_CreateNewObject(slot, slot->session,
                               template, attrs - template, PR_FALSE, &dummy);
    PK11_ExitSlotMonitor(slot);

    if (crv != CKR_OK) {
        PORT_SetError(PK11_MapError(crv));
        return SECFailure;
    }
    return SECMOD_UpdateSlotList(slot->module);
}

/*
 * return true if the selected slot ID is not present or doesn't exist
 */
static PRBool
secmod_SlotIsEmpty(SECMODModule *mod, CK_SLOT_ID slotID)
{
    PK11SlotInfo *slot = SECMOD_LookupSlot(mod->moduleID, slotID);
    if (slot) {
        PRBool present = PK11_IsPresent(slot);
        PK11_FreeSlot(slot);
        if (present) {
            return PR_FALSE;
        }
    }
    /* it doesn't exist or isn't present, it's available */
    return PR_TRUE;
}

/*
 * Find an unused slot id in module.
 */
static CK_SLOT_ID
secmod_FindFreeSlot(SECMODModule *mod)
{
    CK_SLOT_ID i, minSlotID, maxSlotID;

    /* look for a free slot id on the internal module */
    if (mod->internal && mod->isFIPS) {
        minSlotID = SFTK_MIN_FIPS_USER_SLOT_ID;
        maxSlotID = SFTK_MAX_FIPS_USER_SLOT_ID;
    } else {
        minSlotID = SFTK_MIN_USER_SLOT_ID;
        maxSlotID = SFTK_MAX_USER_SLOT_ID;
    }
    for (i = minSlotID; i < maxSlotID; i++) {
        if (secmod_SlotIsEmpty(mod, i)) {
            return i;
        }
    }
    PORT_SetError(SEC_ERROR_NO_SLOT_SELECTED);
    return (CK_SLOT_ID)-1;
}

/*
 * Attempt to open a new slot.
 *
 * This works the same os OpenUserDB except it can be called against
 * any module that understands the softoken protocol for opening new
 * slots, not just the softoken itself. If the selected module does not
 * understand the protocol, C_CreateObject will fail with
 * CKR_INVALID_ATTRIBUTE, and SECMOD_OpenNewSlot will return NULL and set
 * SEC_ERROR_BAD_DATA.
 *
 * NewSlots can be closed with SECMOD_CloseUserDB();
 *
 * Modulespec is module dependent.
 */
PK11SlotInfo *
SECMOD_OpenNewSlot(SECMODModule *mod, const char *moduleSpec)
{
    CK_SLOT_ID slotID = 0;
    PK11SlotInfo *slot;
    char *escSpec;
    char *sendSpec;
    SECStatus rv;

    slotID = secmod_FindFreeSlot(mod);
    if (slotID == (CK_SLOT_ID)-1) {
        return NULL;
    }

    if (mod->slotCount == 0) {
        return NULL;
    }

    /* just grab the first slot in the module, any present slot should work */
    slot = PK11_ReferenceSlot(mod->slots[0]);
    if (slot == NULL) {
        return NULL;
    }

    /* we've found the slot, now build the moduleSpec */
    escSpec = NSSUTIL_DoubleEscape(moduleSpec, '>', ']');
    if (escSpec == NULL) {
        PK11_FreeSlot(slot);
        return NULL;
    }
    sendSpec = PR_smprintf("tokens=[0x%x=<%s>]", slotID, escSpec);
    PORT_Free(escSpec);

    if (sendSpec == NULL) {
        /* PR_smprintf does not set SEC_ERROR_NO_MEMORY on failure. */
        PK11_FreeSlot(slot);
        PORT_SetError(SEC_ERROR_NO_MEMORY);
        return NULL;
    }
    rv = secmod_UserDBOp(slot, CKO_NETSCAPE_NEWSLOT, sendSpec);
    PR_smprintf_free(sendSpec);
    PK11_FreeSlot(slot);
    if (rv != SECSuccess) {
        return NULL;
    }

    slot = SECMOD_FindSlotByID(mod, slotID);
    if (slot) {
        /* if we are in the delay period for the "isPresent" call, reset
         * the delay since we know things have probably changed... */
        if (slot->nssToken && slot->nssToken->slot) {
            nssSlot_ResetDelay(slot->nssToken->slot);
        }
        /* force the slot info structures to properly reset */
        (void)PK11_IsPresent(slot);
    }
    return slot;
}

/*
 * given a module spec, find the slot in the module for it.
 */
PK11SlotInfo *
secmod_FindSlotFromModuleSpec(const char *moduleSpec, SECMODModule *module)
{
    CK_SLOT_ID slot_id = secmod_GetSlotIDFromModuleSpec(moduleSpec, module);
    if (slot_id == -1) {
        return NULL;
    }

    return SECMOD_FindSlotByID(module, slot_id);
}

/*
 * Open a new database using the softoken. The caller is responsible for making
 * sure the module spec is correct and usable. The caller should ask for one
 * new database per call if the caller wants to get meaningful information
 * about the new database.
 *
 * moduleSpec is the same data that you would pass to softoken at
 * initialization time under the 'tokens' options. For example, if you were
 * to specify tokens=<0x4=[configdir='./mybackup' tokenDescription='Backup']>
 * You would specify "configdir='./mybackup' tokenDescription='Backup'" as your
 * module spec here. The slot ID will be calculated for you by
 * SECMOD_OpenUserDB().
 *
 * Typical parameters here are configdir, tokenDescription and flags.
 *
 * a Full list is below:
 *
 *
 *  configDir - The location of the databases for this token. If configDir is
 *         not specified, and noCertDB and noKeyDB is not specified, the load
 *         will fail.
 *   certPrefix - Cert prefix for this token.
 *   keyPrefix - Prefix for the key database for this token. (if not specified,
 *         certPrefix will be used).
 *   tokenDescription - The label value for this token returned in the
 *         CK_TOKEN_INFO structure with an internationalize string (UTF8).
 *         This value will be truncated at 32 bytes (no NULL, partial UTF8
 *         characters dropped). You should specify a user friendly name here
 *         as this is the value the token will be referred to in most
 *         application UI's. You should make sure tokenDescription is unique.
 *   slotDescription - The slotDescription value for this token returned
 *         in the CK_SLOT_INFO structure with an internationalize string
 *         (UTF8). This value will be truncated at 64 bytes (no NULL, partial
 *         UTF8 characters dropped). This name will not change after the
 *         database is closed. It should have some number to make this unique.
 *   minPWLen - minimum password length for this token.
 *   flags - comma separated list of flag values, parsed case-insensitive.
 *         Valid flags are:
 *              readOnly - Databases should be opened read only.
 *              noCertDB - Don't try to open a certificate database.
 *              noKeyDB - Don't try to open a key database.
 *              forceOpen - Don't fail to initialize the token if the
 *                databases could not be opened.
 *              passwordRequired - zero length passwords are not acceptable
 *                (valid only if there is a keyDB).
 *              optimizeSpace - allocate smaller hash tables and lock tables.
 *                When this flag is not specified, Softoken will allocate
 *                large tables to prevent lock contention.
 */
PK11SlotInfo *
SECMOD_OpenUserDB(const char *moduleSpec)
{
    SECMODModule *mod;
    SECMODConfigList *conflist = NULL;
    int count = 0;

    if (moduleSpec == NULL) {
        return NULL;
    }

    /* NOTE: unlike most PK11 function, this does not return a reference
     * to the module */
    mod = SECMOD_GetInternalModule();
    if (!mod) {
        /* shouldn't happen */
        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
        return NULL;
    }

    /* make sure we don't open the same database twice. We only understand 
     * the moduleSpec for internal databases well enough to do this, so only
     * do this in OpenUserDB */
    conflist = secmod_GetConfigList(mod->isFIPS, mod->libraryParams, &count);
    if (conflist) {
        PK11SlotInfo *slot = NULL;
        if (secmod_MatchConfigList(moduleSpec, conflist, count)) {
            slot = secmod_FindSlotFromModuleSpec(moduleSpec, mod);
        }
        secmod_FreeConfigList(conflist, count);
        if (slot) {
            return slot;
        }
    }
    return SECMOD_OpenNewSlot(mod, moduleSpec);
}

/*
 * close an already opened user database. NOTE: the database must be
 * in the internal token, and must be one created with SECMOD_OpenUserDB().
 * Once the database is closed, the slot will remain as an empty slot
 * until it's used again with SECMOD_OpenUserDB() or SECMOD_OpenNewSlot().
 */
SECStatus
SECMOD_CloseUserDB(PK11SlotInfo *slot)
{
    SECStatus rv;
    char *sendSpec;

    sendSpec = PR_smprintf("tokens=[0x%x=<>]", slot->slotID);
    if (sendSpec == NULL) {
        /* PR_smprintf does not set no memory error */
        PORT_SetError(SEC_ERROR_NO_MEMORY);
        return SECFailure;
    }
    rv = secmod_UserDBOp(slot, CKO_NETSCAPE_DELSLOT, sendSpec);
    PR_smprintf_free(sendSpec);
    /* if we are in the delay period for the "isPresent" call, reset
     * the delay since we know things have probably changed... */
    if (slot->nssToken && slot->nssToken->slot) {
        nssSlot_ResetDelay(slot->nssToken->slot);
        /* force the slot info structures to properly reset */
        (void)PK11_IsPresent(slot);
    }
    return rv;
}

/*
 * Restart PKCS #11 modules after a fork(). See secmod.h for more information.
 */
SECStatus
SECMOD_RestartModules(PRBool force)
{
    SECMODModuleList *mlp;
    SECStatus rrv = SECSuccess;
    int lastError = 0;

    if (!moduleLock) {
        PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
        return SECFailure;
    }

    /* Only need to restart the PKCS #11 modules that were initialized */
    SECMOD_GetReadLock(moduleLock);
    for (mlp = modules; mlp != NULL; mlp = mlp->next) {
        SECMODModule *mod = mlp->module;
        CK_ULONG count;
        SECStatus rv;
        int i;

        /* If the module needs to be reset, do so */
        if (force || (PK11_GETTAB(mod)->C_GetSlotList(CK_FALSE, NULL, &count) != CKR_OK)) {
            PRBool alreadyLoaded;
            /* first call Finalize. This is not required by PKCS #11, but some
             * older modules require it, and it doesn't hurt (compliant modules
             * will return CKR_NOT_INITIALIZED */
            (void)PK11_GETTAB(mod)->C_Finalize(NULL);
            /* now initialize the module, this function reinitializes
             * a module in place, preserving existing slots (even if they
             * no longer exist) */
            rv = secmod_ModuleInit(mod, NULL, &alreadyLoaded);
            if (rv != SECSuccess) {
                /* save the last error code */
                lastError = PORT_GetError();
                rrv = rv;
                /* couldn't reinit the module, disable all its slots */
                for (i = 0; i < mod->slotCount; i++) {
                    mod->slots[i]->disabled = PR_TRUE;
                    mod->slots[i]->reason = PK11_DIS_COULD_NOT_INIT_TOKEN;
                }
                continue;
            }
            for (i = 0; i < mod->slotCount; i++) {
                /* get new token sessions, bump the series up so that
                 * we refresh other old sessions. This will tell much of
                 * NSS to flush cached handles it may hold as well */
                rv = PK11_InitToken(mod->slots[i], PR_TRUE);
                /* PK11_InitToken could fail if the slot isn't present.
                 * If it is present, though, something is wrong and we should
                 * disable the slot and let the caller know. */
                if (rv != SECSuccess && PK11_IsPresent(mod->slots[i])) {
                    /* save the last error code */
                    lastError = PORT_GetError();
                    rrv = rv;
                    /* disable the token */
                    mod->slots[i]->disabled = PR_TRUE;
                    mod->slots[i]->reason = PK11_DIS_COULD_NOT_INIT_TOKEN;
                }
            }
        }
    }
    SECMOD_ReleaseReadLock(moduleLock);

    /*
     * on multiple failures, we are only returning the lastError. The caller
     * can determine which slots are bad by calling PK11_IsDisabled().
     */
    if (rrv != SECSuccess) {
        /* restore the last error code */
        PORT_SetError(lastError);
    }

    return rrv;
}