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
|
/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* kdc/kdc_preauth.c - Preauthentication routines for the KDC */
/*
* Copyright 1995, 2003, 2007, 2009 by the Massachusetts Institute of
* Technology. All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
/*
* Copyright (C) 1998 by the FundsXpress, INC.
*
* All rights reserved.
*
* Export of this software from the United States of America may require
* a specific license from the United States Government. It is the
* responsibility of any person or organization contemplating export to
* obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of FundsXpress. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. FundsXpress makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
* Copyright (c) 2006-2008, Novell, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * The copyright holder's name is not used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "k5-int.h"
#include "kdc_util.h"
#include "extern.h"
#include <stdio.h>
#include "adm_proto.h"
#include <syslog.h>
#include <assert.h>
#include <krb5/kdcpreauth_plugin.h>
typedef struct preauth_system_st {
const char *name;
int type;
int flags;
krb5_kdcpreauth_moddata moddata;
krb5_kdcpreauth_init_fn init;
krb5_kdcpreauth_fini_fn fini;
krb5_kdcpreauth_edata_fn get_edata;
krb5_kdcpreauth_verify_fn verify_padata;
krb5_kdcpreauth_return_fn return_padata;
krb5_kdcpreauth_free_modreq_fn free_modreq;
krb5_kdcpreauth_loop_fn loop;
} preauth_system;
static krb5_error_code
make_etype_info(krb5_context context, krb5_preauthtype pa_type,
krb5_principal client, krb5_key_data *client_key,
krb5_enctype enctype, krb5_pa_data **pa_out);
static void
get_etype_info(krb5_context context, krb5_kdc_req *request,
krb5_kdcpreauth_callbacks cb, krb5_kdcpreauth_rock rock,
krb5_kdcpreauth_moddata moddata, krb5_preauthtype pa_type,
krb5_kdcpreauth_edata_respond_fn respond, void *arg);
static krb5_error_code
return_etype_info(krb5_context, krb5_pa_data *padata,
krb5_data *req_pkt, krb5_kdc_req *request,
krb5_kdc_rep *reply, krb5_keyblock *encrypting_key,
krb5_pa_data **send_pa, krb5_kdcpreauth_callbacks cb,
krb5_kdcpreauth_rock rock, krb5_kdcpreauth_moddata moddata,
krb5_kdcpreauth_modreq modreq);
static krb5_error_code
return_pw_salt(krb5_context, krb5_pa_data *padata,
krb5_data *req_pkt, krb5_kdc_req *request, krb5_kdc_rep *reply,
krb5_keyblock *encrypting_key, krb5_pa_data **send_pa,
krb5_kdcpreauth_callbacks cb, krb5_kdcpreauth_rock rock,
krb5_kdcpreauth_moddata moddata, krb5_kdcpreauth_modreq modreq);
static preauth_system static_preauth_systems[] = {
{
"FAST",
KRB5_PADATA_FX_FAST,
PA_HARDWARE,
NULL,
NULL,
NULL,
NULL,
NULL,
0
},
{
"etype-info",
KRB5_PADATA_ETYPE_INFO,
0,
NULL,
NULL,
NULL,
get_etype_info,
0,
return_etype_info
},
{
"etype-info2",
KRB5_PADATA_ETYPE_INFO2,
0,
NULL,
NULL,
NULL,
get_etype_info,
0,
return_etype_info
},
{
"pw-salt",
KRB5_PADATA_PW_SALT,
PA_PSEUDO, /* Don't include this in the error list */
NULL,
NULL,
NULL,
0,
0,
return_pw_salt
},
{
"pac-request",
KRB5_PADATA_PAC_REQUEST,
PA_PSEUDO,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL
},
#if 0
{
"server-referral",
KRB5_PADATA_SERVER_REFERRAL,
PA_PSEUDO,
0,
0,
return_server_referral
},
#endif
};
#define NUM_STATIC_PREAUTH_SYSTEMS (sizeof(static_preauth_systems) / \
sizeof(*static_preauth_systems))
static preauth_system *preauth_systems;
static size_t n_preauth_systems;
/* Get all available kdcpreauth vtables and a count of preauth types they
* support. Return an empty list on failure. */
static void
get_plugin_vtables(krb5_context context,
struct krb5_kdcpreauth_vtable_st **vtables_out,
size_t *n_tables_out, size_t *n_systems_out)
{
krb5_plugin_initvt_fn *plugins = NULL, *pl;
struct krb5_kdcpreauth_vtable_st *vtables;
size_t count, n_tables, n_systems, i;
*vtables_out = NULL;
*n_tables_out = *n_systems_out = 0;
/* Auto-register encrypted challenge and (if possible) pkinit. */
k5_plugin_register_dyn(context, PLUGIN_INTERFACE_KDCPREAUTH, "pkinit",
"preauth");
k5_plugin_register_dyn(context, PLUGIN_INTERFACE_KDCPREAUTH, "otp",
"preauth");
k5_plugin_register(context, PLUGIN_INTERFACE_KDCPREAUTH,
"encrypted_challenge",
kdcpreauth_encrypted_challenge_initvt);
k5_plugin_register(context, PLUGIN_INTERFACE_KDCPREAUTH,
"encrypted_timestamp",
kdcpreauth_encrypted_timestamp_initvt);
if (k5_plugin_load_all(context, PLUGIN_INTERFACE_KDCPREAUTH, &plugins))
return;
for (count = 0; plugins[count]; count++);
vtables = calloc(count + 1, sizeof(*vtables));
if (vtables == NULL)
goto cleanup;
for (pl = plugins, n_tables = 0; *pl != NULL; pl++) {
if ((*pl)(context, 1, 2, (krb5_plugin_vtable)&vtables[n_tables]) == 0)
n_tables++;
}
for (i = 0, n_systems = 0; i < n_tables; i++) {
for (count = 0; vtables[i].pa_type_list[count] != 0; count++);
n_systems += count;
}
*vtables_out = vtables;
*n_tables_out = n_tables;
*n_systems_out = n_systems;
cleanup:
k5_plugin_free_modules(context, plugins);
}
/* Make a list of realm names. The caller should free the list container but
* not the list elements (which are aliases into kdc_realmlist). */
static krb5_error_code
get_realm_names(struct server_handle *handle, const char ***list_out)
{
const char **list;
int i;
list = calloc(handle->kdc_numrealms + 1, sizeof(*list));
if (list == NULL)
return ENOMEM;
for (i = 0; i < handle->kdc_numrealms; i++)
list[i] = handle->kdc_realmlist[i]->realm_name;
list[i] = NULL;
*list_out = list;
return 0;
}
void
load_preauth_plugins(struct server_handle *handle, krb5_context context,
verto_ctx *ctx)
{
krb5_error_code ret;
struct krb5_kdcpreauth_vtable_st *vtables = NULL, *vt;
size_t n_systems, n_tables, i, j;
krb5_kdcpreauth_moddata moddata;
const char **realm_names = NULL, *emsg;
preauth_system *sys;
/* Get all available kdcpreauth vtables. */
get_plugin_vtables(context, &vtables, &n_tables, &n_systems);
/* Allocate the list of static and plugin preauth systems. */
n_systems += NUM_STATIC_PREAUTH_SYSTEMS;
preauth_systems = calloc(n_systems + 1, sizeof(preauth_system));
if (preauth_systems == NULL)
goto cleanup;
if (get_realm_names(handle, &realm_names))
goto cleanup;
/* Add the static system to the list first. No static systems require
* initialization, so just make a direct copy. */
memcpy(preauth_systems, static_preauth_systems,
sizeof(static_preauth_systems));
/* Add the dynamically-loaded mechanisms to the list. */
n_systems = NUM_STATIC_PREAUTH_SYSTEMS;
for (i = 0; i < n_tables; i++) {
/* Try to initialize this module. */
vt = &vtables[i];
moddata = NULL;
if (vt->init) {
ret = vt->init(context, &moddata, realm_names);
if (ret) {
emsg = krb5_get_error_message(context, ret);
krb5_klog_syslog(LOG_ERR, _("preauth %s failed to "
"initialize: %s"), vt->name, emsg);
krb5_free_error_message(context, emsg);
continue;
}
}
if (vt->loop) {
ret = vt->loop(context, moddata, ctx);
if (ret) {
emsg = krb5_get_error_message(context, ret);
krb5_klog_syslog(LOG_ERR, _("preauth %s failed to setup "
"loop: %s"), vt->name, emsg);
krb5_free_error_message(context, emsg);
if (vt->fini)
vt->fini(context, moddata);
continue;
}
}
/* Add this module to the systems list once for each pa type. */
for (j = 0; vt->pa_type_list[j] != 0; j++) {
sys = &preauth_systems[n_systems];
sys->name = vt->name;
sys->type = vt->pa_type_list[j];
sys->flags = (vt->flags) ? vt->flags(context, sys->type) : 0;
sys->moddata = moddata;
sys->init = vt->init;
/* Only call fini once for each plugin. */
sys->fini = (j == 0) ? vt->fini : NULL;
sys->get_edata = vt->edata;
sys->verify_padata = vt->verify;
sys->return_padata = vt->return_padata;
sys->free_modreq = vt->free_modreq;
sys->loop = vt->loop;
n_systems++;
}
}
n_preauth_systems = n_systems;
/* Add the end-of-list marker. */
preauth_systems[n_systems].name = "[end]";
preauth_systems[n_systems].type = -1;
cleanup:
free(vtables);
free(realm_names);
}
void
unload_preauth_plugins(krb5_context context)
{
size_t i;
for (i = 0; i < n_preauth_systems; i++) {
if (preauth_systems[i].fini)
preauth_systems[i].fini(context, preauth_systems[i].moddata);
}
free(preauth_systems);
preauth_systems = NULL;
n_preauth_systems = 0;
}
/*
* The make_padata_context() function creates a space for storing any
* request-specific module data which will be needed by return_padata() later.
* Each preauth type gets a storage location of its own.
*/
struct request_pa_context {
int n_contexts;
struct {
preauth_system *pa_system;
krb5_kdcpreauth_modreq modreq;
} *contexts;
};
static krb5_error_code
make_padata_context(krb5_context context, void **padata_context)
{
int i;
struct request_pa_context *ret;
ret = malloc(sizeof(*ret));
if (ret == NULL) {
return ENOMEM;
}
ret->n_contexts = n_preauth_systems;
ret->contexts = malloc(sizeof(ret->contexts[0]) * ret->n_contexts);
if (ret->contexts == NULL) {
free(ret);
return ENOMEM;
}
memset(ret->contexts, 0, sizeof(ret->contexts[0]) * ret->n_contexts);
for (i = 0; i < ret->n_contexts; i++) {
ret->contexts[i].pa_system = &preauth_systems[i];
ret->contexts[i].modreq = NULL;
}
*padata_context = ret;
return 0;
}
/*
* The free_padata_context function frees any context information pointers
* which the check_padata() function created but which weren't already cleaned
* up by return_padata().
*/
void
free_padata_context(krb5_context kcontext, void *padata_context)
{
struct request_pa_context *context = padata_context;
preauth_system *sys;
int i;
if (context == NULL)
return;
for (i = 0; i < context->n_contexts; i++) {
sys = context->contexts[i].pa_system;
if (!sys->free_modreq || !context->contexts[i].modreq)
continue;
sys->free_modreq(kcontext, sys->moddata, context->contexts[i].modreq);
context->contexts[i].modreq = NULL;
}
free(context->contexts);
free(context);
}
static krb5_deltat
max_time_skew(krb5_context context, krb5_kdcpreauth_rock rock)
{
return context->clockskew;
}
static krb5_error_code
client_keys(krb5_context context, krb5_kdcpreauth_rock rock,
krb5_keyblock **keys_out)
{
krb5_kdc_req *request = rock->request;
krb5_db_entry *client = rock->client;
krb5_keyblock *keys, key;
krb5_key_data *entry_key;
int i, k;
keys = calloc(request->nktypes + 1, sizeof(krb5_keyblock));
if (keys == NULL)
return ENOMEM;
k = 0;
for (i = 0; i < request->nktypes; i++) {
entry_key = NULL;
if (krb5_dbe_find_enctype(context, client, request->ktype[i],
-1, 0, &entry_key) != 0)
continue;
if (krb5_dbe_decrypt_key_data(context, NULL, entry_key,
&key, NULL) != 0)
continue;
keys[k++] = key;
}
if (k == 0) {
free(keys);
return ENOENT;
}
*keys_out = keys;
return 0;
}
static void free_keys(krb5_context context, krb5_kdcpreauth_rock rock,
krb5_keyblock *keys)
{
krb5_keyblock *k;
if (keys == NULL)
return;
for (k = keys; k->enctype != 0; k++)
krb5_free_keyblock_contents(context, k);
free(keys);
}
static krb5_data *
request_body(krb5_context context, krb5_kdcpreauth_rock rock)
{
return rock->inner_body;
}
static krb5_keyblock *
fast_armor(krb5_context context, krb5_kdcpreauth_rock rock)
{
return rock->rstate->armor_key;
}
static krb5_error_code
get_string(krb5_context context, krb5_kdcpreauth_rock rock, const char *key,
char **value_out)
{
return krb5_dbe_get_string(context, rock->client, key, value_out);
}
static void
free_string(krb5_context context, krb5_kdcpreauth_rock rock, char *string)
{
krb5_dbe_free_string(context, string);
}
static void *
client_entry(krb5_context context, krb5_kdcpreauth_rock rock)
{
return rock->client;
}
static verto_ctx *
event_context(krb5_context context, krb5_kdcpreauth_rock rock)
{
return rock->vctx;
}
static krb5_boolean
have_client_keys(krb5_context context, krb5_kdcpreauth_rock rock)
{
krb5_kdc_req *request = rock->request;
krb5_key_data *kd;
int i;
for (i = 0; i < request->nktypes; i++) {
if (krb5_dbe_find_enctype(context, rock->client, request->ktype[i],
-1, 0, &kd) == 0)
return TRUE;
}
return FALSE;
}
static const krb5_keyblock *
client_keyblock(krb5_context context, krb5_kdcpreauth_rock rock)
{
return rock->client_keyblock;
}
static krb5_error_code
add_auth_indicator(krb5_context context, krb5_kdcpreauth_rock rock,
const char *indicator)
{
return authind_add(context, indicator, rock->auth_indicators);
}
static krb5_boolean
get_cookie(krb5_context context, krb5_kdcpreauth_rock rock,
krb5_preauthtype pa_type, krb5_data *out)
{
return kdc_fast_search_cookie(rock->rstate, pa_type, out);
}
static krb5_error_code
set_cookie(krb5_context context, krb5_kdcpreauth_rock rock,
krb5_preauthtype pa_type, const krb5_data *data)
{
return kdc_fast_set_cookie(rock->rstate, pa_type, data);
}
static struct krb5_kdcpreauth_callbacks_st callbacks = {
3,
max_time_skew,
client_keys,
free_keys,
request_body,
fast_armor,
get_string,
free_string,
client_entry,
event_context,
have_client_keys,
client_keyblock,
add_auth_indicator,
get_cookie,
set_cookie
};
static krb5_error_code
find_pa_system(int type, preauth_system **preauth)
{
preauth_system *ap;
ap = preauth_systems ? preauth_systems : static_preauth_systems;
while ((ap->type != -1) && (ap->type != type))
ap++;
if (ap->type == -1)
return(KRB5_PREAUTH_BAD_TYPE);
*preauth = ap;
return 0;
}
/* Find a pointer to the request-specific module data for pa_sys. */
static krb5_error_code
find_modreq(preauth_system *pa_sys, struct request_pa_context *context,
krb5_kdcpreauth_modreq **modreq_out)
{
int i;
*modreq_out = NULL;
if (context == NULL)
return KRB5KRB_ERR_GENERIC;
for (i = 0; i < context->n_contexts; i++) {
if (context->contexts[i].pa_system == pa_sys) {
*modreq_out = &context->contexts[i].modreq;
return 0;
}
}
return KRB5KRB_ERR_GENERIC;
}
/*
* Create a list of indices into the preauth_systems array, sorted by order of
* preference.
*/
static krb5_boolean
pa_list_includes(krb5_pa_data **pa_data, krb5_preauthtype pa_type)
{
while (*pa_data != NULL) {
if ((*pa_data)->pa_type == pa_type)
return TRUE;
pa_data++;
}
return FALSE;
}
static void
sort_pa_order(krb5_context context, krb5_kdc_req *request, int *pa_order)
{
size_t i, j, k, n_repliers, n_key_replacers;
/* First, set up the default order. */
i = 0;
for (j = 0; j < n_preauth_systems; j++) {
if (preauth_systems[j].return_padata != NULL)
pa_order[i++] = j;
}
n_repliers = i;
pa_order[n_repliers] = -1;
/* Reorder so that PA_REPLACES_KEY modules are listed first. */
for (i = 0; i < n_repliers; i++) {
/* If this module replaces the key, then it's okay to leave it where it
* is in the order. */
if (preauth_systems[pa_order[i]].flags & PA_REPLACES_KEY)
continue;
/* If not, search for a module which does, and swap in the first one we
* find. */
for (j = i + 1; j < n_repliers; j++) {
if (preauth_systems[pa_order[j]].flags & PA_REPLACES_KEY) {
k = pa_order[j];
pa_order[j] = pa_order[i];
pa_order[i] = k;
break;
}
}
}
if (request->padata != NULL) {
/* Now reorder the subset of modules which replace the key,
* bubbling those which handle pa_data types provided by the
* client ahead of the others.
*/
for (i = 0; preauth_systems[pa_order[i]].flags & PA_REPLACES_KEY; i++) {
continue;
}
n_key_replacers = i;
for (i = 0; i < n_key_replacers; i++) {
if (pa_list_includes(request->padata,
preauth_systems[pa_order[i]].type))
continue;
for (j = i + 1; j < n_key_replacers; j++) {
if (pa_list_includes(request->padata,
preauth_systems[pa_order[j]].type)) {
k = pa_order[j];
pa_order[j] = pa_order[i];
pa_order[i] = k;
break;
}
}
}
}
#ifdef DEBUG
krb5_klog_syslog(LOG_DEBUG, "original preauth mechanism list:");
for (i = 0; i < n_preauth_systems; i++) {
if (preauth_systems[i].return_padata != NULL)
krb5_klog_syslog(LOG_DEBUG, "... %s(%d)", preauth_systems[i].name,
preauth_systems[i].type);
}
krb5_klog_syslog(LOG_DEBUG, "sorted preauth mechanism list:");
for (i = 0; pa_order[i] != -1; i++) {
krb5_klog_syslog(LOG_DEBUG, "... %s(%d)",
preauth_systems[pa_order[i]].name,
preauth_systems[pa_order[i]].type);
}
#endif
}
const char *missing_required_preauth(krb5_db_entry *client,
krb5_db_entry *server,
krb5_enc_tkt_part *enc_tkt_reply)
{
#if 0
/*
* If this is the pwchange service, and the pre-auth bit is set,
* allow it even if the HW preauth would normally be required.
*
* Sandia national labs wanted this for some strange reason... we
* leave it disabled normally.
*/
if (isflagset(server->attributes, KRB5_KDB_PWCHANGE_SERVICE) &&
isflagset(enc_tkt_reply->flags, TKT_FLG_PRE_AUTH))
return 0;
#endif
#ifdef DEBUG
krb5_klog_syslog (
LOG_DEBUG,
"client needs %spreauth, %shw preauth; request has %spreauth, %shw preauth",
isflagset (client->attributes, KRB5_KDB_REQUIRES_PRE_AUTH) ? "" : "no ",
isflagset (client->attributes, KRB5_KDB_REQUIRES_HW_AUTH) ? "" : "no ",
isflagset (enc_tkt_reply->flags, TKT_FLG_PRE_AUTH) ? "" : "no ",
isflagset (enc_tkt_reply->flags, TKT_FLG_HW_AUTH) ? "" : "no ");
#endif
if (isflagset(client->attributes, KRB5_KDB_REQUIRES_PRE_AUTH) &&
!isflagset(enc_tkt_reply->flags, TKT_FLG_PRE_AUTH))
return "NEEDED_PREAUTH";
if (isflagset(client->attributes, KRB5_KDB_REQUIRES_HW_AUTH) &&
!isflagset(enc_tkt_reply->flags, TKT_FLG_HW_AUTH))
return "NEEDED_HW_PREAUTH";
return 0;
}
struct hint_state {
kdc_hint_respond_fn respond;
void *arg;
kdc_realm_t *realm;
krb5_kdcpreauth_rock rock;
krb5_kdc_req *request;
krb5_pa_data ***e_data_out;
int hw_only;
preauth_system *ap;
krb5_pa_data **pa_data, **pa_cur;
krb5_preauthtype pa_type;
};
static void
hint_list_finish(struct hint_state *state, krb5_error_code code)
{
kdc_hint_respond_fn oldrespond = state->respond;
void *oldarg = state->arg;
kdc_realm_t *kdc_active_realm = state->realm;
if (!code) {
if (state->pa_data[0] == 0) {
krb5_klog_syslog(LOG_INFO,
_("%spreauth required but hint list is empty"),
state->hw_only ? "hw" : "");
}
*state->e_data_out = state->pa_data;
state->pa_data = NULL;
}
krb5_free_pa_data(kdc_context, state->pa_data);
free(state);
(*oldrespond)(oldarg);
}
static void
hint_list_next(struct hint_state *arg);
static void
finish_get_edata(void *arg, krb5_error_code code, krb5_pa_data *pa)
{
struct hint_state *state = arg;
if (code == 0) {
if (pa == NULL) {
/* Include an empty value of the current type. */
pa = calloc(1, sizeof(*pa));
pa->magic = KV5M_PA_DATA;
pa->pa_type = state->pa_type;
}
*state->pa_cur++ = pa;
}
state->ap++;
hint_list_next(state);
}
static void
hint_list_next(struct hint_state *state)
{
preauth_system *ap = state->ap;
kdc_realm_t *kdc_active_realm = state->realm;
if (ap->type == -1) {
hint_list_finish(state, 0);
return;
}
if (state->hw_only && !(ap->flags & PA_HARDWARE))
goto next;
if (ap->flags & PA_PSEUDO)
goto next;
state->pa_type = ap->type;
if (ap->get_edata) {
ap->get_edata(kdc_context, state->request, &callbacks, state->rock,
ap->moddata, ap->type, finish_get_edata, state);
} else
finish_get_edata(state, 0, NULL);
return;
next:
state->ap++;
hint_list_next(state);
}
void
get_preauth_hint_list(krb5_kdc_req *request, krb5_kdcpreauth_rock rock,
krb5_pa_data ***e_data_out, kdc_hint_respond_fn respond,
void *arg)
{
struct hint_state *state;
*e_data_out = NULL;
/* Allocate our state. */
state = calloc(1, sizeof(*state));
if (state == NULL) {
(*respond)(arg);
return;
}
state->hw_only = isflagset(rock->client->attributes,
KRB5_KDB_REQUIRES_HW_AUTH);
state->respond = respond;
state->arg = arg;
state->request = request;
state->rock = rock;
state->realm = rock->rstate->realm_data;
state->e_data_out = e_data_out;
state->pa_data = calloc(n_preauth_systems + 1, sizeof(krb5_pa_data *));
if (!state->pa_data) {
free(state);
(*respond)(arg);
return;
}
state->pa_cur = state->pa_data;
state->ap = preauth_systems;
hint_list_next(state);
}
/*
* Add authorization data returned from preauth modules to the ticket
* It is assumed that ad is a "null-terminated" array of krb5_authdata ptrs
*/
static krb5_error_code
add_authorization_data(krb5_enc_tkt_part *enc_tkt_part, krb5_authdata **ad)
{
krb5_authdata **newad;
int oldones, newones;
int i;
if (enc_tkt_part == NULL || ad == NULL)
return EINVAL;
for (newones = 0; ad[newones] != NULL; newones++);
if (newones == 0)
return 0; /* nothing to add */
if (enc_tkt_part->authorization_data == NULL)
oldones = 0;
else
for (oldones = 0;
enc_tkt_part->authorization_data[oldones] != NULL; oldones++);
newad = malloc((oldones + newones + 1) * sizeof(krb5_authdata *));
if (newad == NULL)
return ENOMEM;
/* Copy any existing pointers */
for (i = 0; i < oldones; i++)
newad[i] = enc_tkt_part->authorization_data[i];
/* Add the new ones */
for (i = 0; i < newones; i++)
newad[oldones+i] = ad[i];
/* Terminate the new list */
newad[oldones+i] = NULL;
/* Free any existing list */
if (enc_tkt_part->authorization_data != NULL)
free(enc_tkt_part->authorization_data);
/* Install our new list */
enc_tkt_part->authorization_data = newad;
return 0;
}
struct padata_state {
kdc_preauth_respond_fn respond;
void *arg;
kdc_realm_t *realm;
krb5_kdcpreauth_modreq *modreq_ptr;
krb5_pa_data **padata;
int pa_found;
krb5_context context;
krb5_kdcpreauth_rock rock;
krb5_data *req_pkt;
krb5_kdc_req *request;
krb5_enc_tkt_part *enc_tkt_reply;
void **padata_context;
preauth_system *pa_sys;
krb5_pa_data **pa_e_data;
krb5_boolean typed_e_data_flag;
int pa_ok;
krb5_error_code saved_code;
krb5_pa_data ***e_data_out;
krb5_boolean *typed_e_data_out;
};
/* Return code if it is 0 or one of the codes we pass through to the client.
* Otherwise return KRB5KDC_ERR_PREAUTH_FAILED. */
static krb5_error_code
filter_preauth_error(krb5_error_code code)
{
/* The following switch statement allows us
* to return some preauth system errors back to the client.
*/
switch(code) {
case 0:
case KRB5KRB_AP_ERR_BAD_INTEGRITY:
case KRB5KRB_AP_ERR_SKEW:
case KRB5KDC_ERR_PREAUTH_REQUIRED:
case KRB5KDC_ERR_ETYPE_NOSUPP:
/* rfc 4556 */
case KRB5KDC_ERR_CLIENT_NOT_TRUSTED:
case KRB5KDC_ERR_INVALID_SIG:
case KRB5KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED:
case KRB5KDC_ERR_CANT_VERIFY_CERTIFICATE:
case KRB5KDC_ERR_INVALID_CERTIFICATE:
case KRB5KDC_ERR_REVOKED_CERTIFICATE:
case KRB5KDC_ERR_REVOCATION_STATUS_UNKNOWN:
case KRB5KDC_ERR_CLIENT_NAME_MISMATCH:
case KRB5KDC_ERR_INCONSISTENT_KEY_PURPOSE:
case KRB5KDC_ERR_DIGEST_IN_CERT_NOT_ACCEPTED:
case KRB5KDC_ERR_PA_CHECKSUM_MUST_BE_INCLUDED:
case KRB5KDC_ERR_DIGEST_IN_SIGNED_DATA_NOT_ACCEPTED:
case KRB5KDC_ERR_PUBLIC_KEY_ENCRYPTION_NOT_SUPPORTED:
/* earlier drafts of what became rfc 4556 */
case KRB5KDC_ERR_CERTIFICATE_MISMATCH:
case KRB5KDC_ERR_KDC_NOT_TRUSTED:
case KRB5KDC_ERR_REVOCATION_STATUS_UNAVAILABLE:
/* This value is shared with
* KRB5KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED. */
/* case KRB5KDC_ERR_KEY_TOO_WEAK: */
case KRB5KDC_ERR_DISCARD:
/* pkinit alg-agility */
case KRB5KDC_ERR_NO_ACCEPTABLE_KDF:
/* rfc 6113 */
case KRB5KDC_ERR_MORE_PREAUTH_DATA_REQUIRED:
return code;
default:
return KRB5KDC_ERR_PREAUTH_FAILED;
}
}
/*
* If the client performed optimistic pre-authentication for a multi-round-trip
* mechanism, it may need key information to complete the exchange, so send it
* a PA-ETYPE-INFO2 element in addition to the pa-data from the module.
*/
static krb5_error_code
maybe_add_etype_info2(struct padata_state *state, krb5_error_code code)
{
krb5_context context = state->context;
krb5_kdcpreauth_rock rock = state->rock;
krb5_pa_data **list = state->pa_e_data;
size_t count;
/* Only add key information when requesting another preauth round trip. */
if (code != KRB5KDC_ERR_MORE_PREAUTH_DATA_REQUIRED)
return 0;
/* Don't try to add key information when there is no key. */
if (rock->client_key == NULL)
return 0;
/* If the client sent a cookie, it has already seen a KDC response with key
* information. */
if (krb5int_find_pa_data(context, state->request->padata,
KRB5_PADATA_FX_COOKIE) != NULL)
return 0;
/* Reallocate state->pa_e_data to make room for the etype-info2 element. */
for (count = 0; list != NULL && list[count] != NULL; count++);
list = realloc(list, (count + 2) * sizeof(*list));
if (list == NULL)
return ENOMEM;
list[count] = list[count + 1] = NULL;
state->pa_e_data = list;
/* Generate an etype-info2 element in the new slot. */
return make_etype_info(context, KRB5_PADATA_ETYPE_INFO2,
rock->client->princ, rock->client_key,
rock->client_keyblock->enctype, &list[count]);
}
/* Release state and respond to the AS-REQ processing code with the result of
* checking pre-authentication data. */
static void
finish_check_padata(struct padata_state *state, krb5_error_code code)
{
kdc_preauth_respond_fn respond;
void *arg;
if (state->pa_ok || !state->pa_found) {
/* Return successfully. If we didn't match a preauth system, we may
* return PREAUTH_REQUIRED later, but we didn't fail to verify. */
code = 0;
goto cleanup;
}
/* Add key information to the saved error pa-data if required. */
if (maybe_add_etype_info2(state, code) != 0) {
code = KRB5KDC_ERR_PREAUTH_FAILED;
goto cleanup;
}
/* Return any saved error pa-data, stealing the pointer from state. */
*state->e_data_out = state->pa_e_data;
*state->typed_e_data_out = state->typed_e_data_flag;
state->pa_e_data = NULL;
cleanup:
/* Discard saved error pa-data if we aren't returning it, free state, and
* respond to the AS-REQ processing code. */
respond = state->respond;
arg = state->arg;
krb5_free_pa_data(state->context, state->pa_e_data);
free(state);
(*respond)(arg, filter_preauth_error(code));
}
static void
next_padata(struct padata_state *state);
static void
finish_verify_padata(void *arg, krb5_error_code code,
krb5_kdcpreauth_modreq modreq, krb5_pa_data **e_data,
krb5_authdata **authz_data)
{
struct padata_state *state = arg;
const char *emsg;
krb5_boolean typed_e_data_flag;
assert(state);
*state->modreq_ptr = modreq;
if (code) {
emsg = krb5_get_error_message(state->context, code);
krb5_klog_syslog(LOG_INFO, "preauth (%s) verify failure: %s",
state->pa_sys->name, emsg);
krb5_free_error_message(state->context, emsg);
/* Ignore authorization data returned from modules that fail */
if (authz_data != NULL) {
krb5_free_authdata(state->context, authz_data);
authz_data = NULL;
}
typed_e_data_flag = ((state->pa_sys->flags & PA_TYPED_E_DATA) != 0);
/*
* We'll return edata from either the first PA_REQUIRED module
* that fails, or the first non-PA_REQUIRED module that fails.
* Hang on to edata from the first non-PA_REQUIRED module.
* If we've already got one saved, simply discard this one.
*/
if (state->pa_sys->flags & PA_REQUIRED) {
/* free up any previous edata we might have been saving */
if (state->pa_e_data != NULL)
krb5_free_pa_data(state->context, state->pa_e_data);
state->pa_e_data = e_data;
state->typed_e_data_flag = typed_e_data_flag;
/* Make sure we use the current retval */
state->pa_ok = 0;
finish_check_padata(state, code);
return;
} else if (state->pa_e_data == NULL) {
/* save the first error code and e-data */
state->pa_e_data = e_data;
state->typed_e_data_flag = typed_e_data_flag;
state->saved_code = code;
} else if (e_data != NULL) {
/* discard this extra e-data from non-PA_REQUIRED module */
krb5_free_pa_data(state->context, e_data);
}
} else {
#ifdef DEBUG
krb5_klog_syslog (LOG_DEBUG, ".. .. ok");
#endif
/* Ignore any edata returned on success */
if (e_data != NULL)
krb5_free_pa_data(state->context, e_data);
/* Add any authorization data to the ticket */
if (authz_data != NULL) {
add_authorization_data(state->enc_tkt_reply, authz_data);
free(authz_data);
}
state->pa_ok = 1;
if (state->pa_sys->flags & PA_SUFFICIENT) {
finish_check_padata(state, state->saved_code);
return;
}
}
next_padata(state);
}
static void
next_padata(struct padata_state *state)
{
assert(state);
if (!state->padata)
state->padata = state->request->padata;
else
state->padata++;
if (!*state->padata) {
finish_check_padata(state, state->saved_code);
return;
}
#ifdef DEBUG
krb5_klog_syslog (LOG_DEBUG, ".. pa_type 0x%x", (*state->padata)->pa_type);
#endif
if (find_pa_system((*state->padata)->pa_type, &state->pa_sys))
goto next;
if (find_modreq(state->pa_sys, *state->padata_context, &state->modreq_ptr))
goto next;
#ifdef DEBUG
krb5_klog_syslog (LOG_DEBUG, ".. pa_type %s", state->pa_sys->name);
#endif
if (state->pa_sys->verify_padata == 0)
goto next;
state->pa_found++;
state->pa_sys->verify_padata(state->context, state->req_pkt,
state->request, state->enc_tkt_reply,
*state->padata, &callbacks, state->rock,
state->pa_sys->moddata, finish_verify_padata,
state);
return;
next:
next_padata(state);
}
/*
* This routine is called to verify the preauthentication information
* for a V5 request.
*
* Returns 0 if the pre-authentication is valid, non-zero to indicate
* an error code of some sort.
*/
void
check_padata(krb5_context context, krb5_kdcpreauth_rock rock,
krb5_data *req_pkt, krb5_kdc_req *request,
krb5_enc_tkt_part *enc_tkt_reply, void **padata_context,
krb5_pa_data ***e_data, krb5_boolean *typed_e_data,
kdc_preauth_respond_fn respond, void *arg)
{
struct padata_state *state;
if (request->padata == 0) {
(*respond)(arg, 0);
return;
}
if (make_padata_context(context, padata_context) != 0) {
(*respond)(arg, KRB5KRB_ERR_GENERIC);
return;
}
state = calloc(1, sizeof(*state));
if (state == NULL) {
(*respond)(arg, ENOMEM);
return;
}
state->respond = respond;
state->arg = arg;
state->context = context;
state->rock = rock;
state->req_pkt = req_pkt;
state->request = request;
state->enc_tkt_reply = enc_tkt_reply;
state->padata_context = padata_context;
state->e_data_out = e_data;
state->typed_e_data_out = typed_e_data;
state->realm = rock->rstate->realm_data;
#ifdef DEBUG
krb5_klog_syslog (LOG_DEBUG, "checking padata");
#endif
next_padata(state);
}
/*
* return_padata creates any necessary preauthentication
* structures which should be returned by the KDC to the client
*/
krb5_error_code
return_padata(krb5_context context, krb5_kdcpreauth_rock rock,
krb5_data *req_pkt, krb5_kdc_req *request, krb5_kdc_rep *reply,
krb5_keyblock *encrypting_key, void **padata_context)
{
krb5_error_code retval;
krb5_pa_data ** padata;
krb5_pa_data ** send_pa_list;
krb5_pa_data ** send_pa;
krb5_pa_data * pa = 0;
krb5_pa_data null_item;
preauth_system * ap;
int * pa_order;
int * pa_type;
int size = 0;
krb5_kdcpreauth_modreq *modreq_ptr;
krb5_boolean key_modified;
krb5_keyblock original_key;
if ((!*padata_context) &&
(make_padata_context(context, padata_context) != 0)) {
return KRB5KRB_ERR_GENERIC;
}
for (ap = preauth_systems; ap->type != -1; ap++) {
if (ap->return_padata)
size++;
}
if ((send_pa_list = malloc((size+1) * sizeof(krb5_pa_data *))) == NULL)
return ENOMEM;
if ((pa_order = malloc((size+1) * sizeof(int))) == NULL) {
free(send_pa_list);
return ENOMEM;
}
sort_pa_order(context, request, pa_order);
retval = krb5_copy_keyblock_contents(context, encrypting_key,
&original_key);
if (retval) {
free(send_pa_list);
free(pa_order);
return retval;
}
key_modified = FALSE;
null_item.contents = NULL;
null_item.length = 0;
send_pa = send_pa_list;
*send_pa = 0;
for (pa_type = pa_order; *pa_type != -1; pa_type++) {
ap = &preauth_systems[*pa_type];
if (!key_modified)
if (original_key.enctype != encrypting_key->enctype)
key_modified = TRUE;
if (!key_modified)
if (original_key.length != encrypting_key->length)
key_modified = TRUE;
if (!key_modified)
if (memcmp(original_key.contents, encrypting_key->contents,
original_key.length) != 0)
key_modified = TRUE;
if (key_modified && (ap->flags & PA_REPLACES_KEY))
continue;
if (ap->return_padata == 0)
continue;
if (find_modreq(ap, *padata_context, &modreq_ptr))
continue;
pa = &null_item;
null_item.pa_type = ap->type;
if (request->padata) {
for (padata = request->padata; *padata; padata++) {
if ((*padata)->pa_type == ap->type) {
pa = *padata;
break;
}
}
}
retval = ap->return_padata(context, pa, req_pkt, request, reply,
encrypting_key, send_pa, &callbacks, rock,
ap->moddata, *modreq_ptr);
if (retval)
goto cleanup;
if (*send_pa)
send_pa++;
*send_pa = 0;
}
retval = 0;
if (send_pa_list[0]) {
reply->padata = send_pa_list;
send_pa_list = 0;
}
cleanup:
krb5_free_keyblock_contents(context, &original_key);
free(pa_order);
if (send_pa_list)
krb5_free_pa_data(context, send_pa_list);
return (retval);
}
static krb5_error_code
_make_etype_info_entry(krb5_context context,
krb5_principal client_princ, krb5_key_data *client_key,
krb5_enctype etype, krb5_etype_info_entry **entry_out,
int etype_info2)
{
krb5_error_code retval;
krb5_int16 salttype;
krb5_data *salt = NULL;
krb5_etype_info_entry *entry = NULL;
*entry_out = NULL;
entry = malloc(sizeof(*entry));
if (entry == NULL)
return ENOMEM;
entry->magic = KV5M_ETYPE_INFO_ENTRY;
entry->etype = etype;
entry->length = KRB5_ETYPE_NO_SALT;
entry->salt = NULL;
entry->s2kparams = empty_data();
retval = krb5_dbe_compute_salt(context, client_key, client_princ,
&salttype, &salt);
if (retval)
goto cleanup;
if (etype_info2 && salttype == KRB5_KDB_SALTTYPE_AFS3) {
switch (etype) {
case ENCTYPE_DES_CBC_CRC:
case ENCTYPE_DES_CBC_MD4:
case ENCTYPE_DES_CBC_MD5:
retval = alloc_data(&entry->s2kparams, 1);
if (retval)
goto cleanup;
entry->s2kparams.data[0] = 1;
break;
default:
break;
}
}
entry->length = salt->length;
entry->salt = (unsigned char *)salt->data;
salt->data = NULL;
*entry_out = entry;
entry = NULL;
cleanup:
if (entry != NULL)
krb5_free_data_contents(context, &entry->s2kparams);
free(entry);
krb5_free_data(context, salt);
return retval;
}
/* Create etype-info or etype-info2 padata for client_key with the given
* enctype, using client to compute the salt if necessary. */
static krb5_error_code
make_etype_info(krb5_context context, krb5_preauthtype pa_type,
krb5_principal client, krb5_key_data *client_key,
krb5_enctype enctype, krb5_pa_data **pa_out)
{
krb5_error_code retval;
krb5_pa_data *pa = NULL;
krb5_etype_info_entry **entry = NULL;
krb5_data *scratch = NULL;
int etype_info2 = (pa_type == KRB5_PADATA_ETYPE_INFO2);
*pa_out = NULL;
entry = k5calloc(2, sizeof(*entry), &retval);
if (entry == NULL)
goto cleanup;
retval = _make_etype_info_entry(context, client, client_key, enctype,
&entry[0], etype_info2);
if (retval != 0)
goto cleanup;
if (etype_info2)
retval = encode_krb5_etype_info2(entry, &scratch);
else
retval = encode_krb5_etype_info(entry, &scratch);
if (retval)
goto cleanup;
pa = k5alloc(sizeof(*pa), &retval);
if (pa == NULL)
goto cleanup;
pa->magic = KV5M_PA_DATA;
pa->pa_type = pa_type;
pa->contents = (unsigned char *)scratch->data;
pa->length = scratch->length;
scratch->data = NULL;
*pa_out = pa;
cleanup:
krb5_free_etype_info(context, entry);
krb5_free_data(context, scratch);
return retval;
}
/* Return true if request's enctypes indicate support for etype-info2. */
static krb5_boolean
requires_info2(const krb5_kdc_req *request)
{
int i;
for (i = 0; i < request->nktypes; i++) {
if (enctype_requires_etype_info_2(request->ktype[i]))
return TRUE;
}
return FALSE;
}
/* Generate hint list padata for PA-ETYPE-INFO or PA-ETYPE-INFO2. */
static void
get_etype_info(krb5_context context, krb5_kdc_req *request,
krb5_kdcpreauth_callbacks cb, krb5_kdcpreauth_rock rock,
krb5_kdcpreauth_moddata moddata, krb5_preauthtype pa_type,
krb5_kdcpreauth_edata_respond_fn respond, void *arg)
{
krb5_error_code ret;
krb5_pa_data *pa = NULL;
if (rock->client_key == NULL) {
ret = KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
} else if (pa_type == KRB5_PADATA_ETYPE_INFO && requires_info2(request)) {
ret = KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
} else {
ret = make_etype_info(context, pa_type, rock->client->princ,
rock->client_key, rock->client_keyblock->enctype,
&pa);
}
(*respond)(arg, ret, pa);
}
/* Generate AS-REP padata for PA-ETYPE-INFO or PA-ETYPE-INFO2. */
static krb5_error_code
return_etype_info(krb5_context context, krb5_pa_data *padata,
krb5_data *req_pkt, krb5_kdc_req *request,
krb5_kdc_rep *reply, krb5_keyblock *encrypting_key,
krb5_pa_data **send_pa, krb5_kdcpreauth_callbacks cb,
krb5_kdcpreauth_rock rock, krb5_kdcpreauth_moddata moddata,
krb5_kdcpreauth_modreq modreq)
{
*send_pa = NULL;
if (rock->client_key == NULL)
return 0;
if (padata->pa_type == KRB5_PADATA_ETYPE_INFO && requires_info2(request))
return 0;
return make_etype_info(context, padata->pa_type, rock->client->princ,
rock->client_key, encrypting_key->enctype, send_pa);
}
static krb5_error_code
return_pw_salt(krb5_context context, krb5_pa_data *in_padata,
krb5_data *req_pkt, krb5_kdc_req *request, krb5_kdc_rep *reply,
krb5_keyblock *encrypting_key, krb5_pa_data **send_pa,
krb5_kdcpreauth_callbacks cb, krb5_kdcpreauth_rock rock,
krb5_kdcpreauth_moddata moddata, krb5_kdcpreauth_modreq modreq)
{
krb5_error_code retval;
krb5_pa_data * padata;
krb5_data * salt = NULL;
krb5_int16 salttype;
krb5_key_data * client_key = rock->client_key;
if (client_key == NULL || requires_info2(request))
return 0;
retval = krb5_dbe_compute_salt(context, client_key, request->client,
&salttype, &salt);
if (retval)
return 0;
padata = k5alloc(sizeof(*padata), &retval);
if (padata == NULL)
goto cleanup;
padata->magic = KV5M_PA_DATA;
if (salttype == KRB5_KDB_SALTTYPE_AFS3) {
padata->contents = k5memdup0(salt->data, salt->length, &retval);
if (padata->contents == NULL)
goto cleanup;
padata->pa_type = KRB5_PADATA_AFS3_SALT;
padata->length = salt->length + 1;
} else {
padata->pa_type = KRB5_PADATA_PW_SALT;
padata->length = salt->length;
padata->contents = (krb5_octet *)salt->data;
salt->data = NULL;
}
*send_pa = padata;
padata = NULL;
cleanup:
free(padata);
krb5_free_data(context, salt);
return retval;
}
/*
* Returns TRUE if the PAC should be included
*/
krb5_boolean
include_pac_p(krb5_context context, krb5_kdc_req *request)
{
krb5_error_code code;
krb5_pa_data **padata;
krb5_boolean retval = TRUE; /* default is to return PAC */
krb5_data data;
krb5_pa_pac_req *req = NULL;
if (request->padata == NULL) {
return retval;
}
for (padata = request->padata; *padata != NULL; padata++) {
if ((*padata)->pa_type == KRB5_PADATA_PAC_REQUEST) {
data.data = (char *)(*padata)->contents;
data.length = (*padata)->length;
code = decode_krb5_pa_pac_req(&data, &req);
if (code == 0) {
retval = req->include_pac;
krb5_free_pa_pac_req(context, req);
req = NULL;
}
break;
}
}
return retval;
}
static krb5_error_code
return_referral_enc_padata( krb5_context context,
krb5_enc_kdc_rep_part *reply,
krb5_db_entry *server)
{
krb5_error_code code;
krb5_tl_data tl_data;
krb5_pa_data pa_data;
tl_data.tl_data_type = KRB5_TL_SVR_REFERRAL_DATA;
code = krb5_dbe_lookup_tl_data(context, server, &tl_data);
if (code || tl_data.tl_data_length == 0)
return 0;
pa_data.magic = KV5M_PA_DATA;
pa_data.pa_type = KRB5_PADATA_SVR_REFERRAL_INFO;
pa_data.length = tl_data.tl_data_length;
pa_data.contents = tl_data.tl_data_contents;
return add_pa_data_element(context, &pa_data, &reply->enc_padata, TRUE);
}
krb5_error_code
return_enc_padata(krb5_context context, krb5_data *req_pkt,
krb5_kdc_req *request, krb5_keyblock *reply_key,
krb5_db_entry *server, krb5_enc_kdc_rep_part *reply_encpart,
krb5_boolean is_referral)
{
krb5_error_code code = 0;
/* This should be initialized and only used for Win2K compat and other
* specific standardized uses such as FAST negotiation. */
assert(reply_encpart->enc_padata == NULL);
if (is_referral) {
code = return_referral_enc_padata(context, reply_encpart, server);
if (code)
return code;
}
code = kdc_handle_protected_negotiation(context, req_pkt, request, reply_key,
&reply_encpart->enc_padata);
if (code)
goto cleanup;
/*Add potentially other enc_padata providers*/
cleanup:
return code;
}
#if 0
static krb5_error_code return_server_referral(krb5_context context,
krb5_pa_data * padata,
krb5_db_entry *client,
krb5_db_entry *server,
krb5_kdc_req *request,
krb5_kdc_rep *reply,
krb5_key_data *client_key,
krb5_keyblock *encrypting_key,
krb5_pa_data **send_pa)
{
krb5_error_code code;
krb5_tl_data tl_data;
krb5_pa_data *pa_data;
krb5_enc_data enc_data;
krb5_data plain;
krb5_data *enc_pa_data;
*send_pa = NULL;
tl_data.tl_data_type = KRB5_TL_SERVER_REFERRAL;
code = krb5_dbe_lookup_tl_data(context, server, &tl_data);
if (code || tl_data.tl_data_length == 0)
return 0; /* no server referrals to return */
plain.length = tl_data.tl_data_length;
plain.data = tl_data.tl_data_contents;
/* Encrypt ServerReferralData */
code = krb5_encrypt_helper(context, encrypting_key,
KRB5_KEYUSAGE_PA_SERVER_REFERRAL_DATA,
&plain, &enc_data);
if (code)
return code;
/* Encode ServerReferralData into PA-SERVER-REFERRAL-DATA */
code = encode_krb5_enc_data(&enc_data, &enc_pa_data);
if (code) {
krb5_free_data_contents(context, &enc_data.ciphertext);
return code;
}
krb5_free_data_contents(context, &enc_data.ciphertext);
/* Return PA-SERVER-REFERRAL-DATA */
pa_data = (krb5_pa_data *)malloc(sizeof(*pa_data));
if (pa_data == NULL) {
krb5_free_data(context, enc_pa_data);
return ENOMEM;
}
pa_data->magic = KV5M_PA_DATA;
pa_data->pa_type = KRB5_PADATA_SVR_REFERRAL_INFO;
pa_data->length = enc_pa_data->length;
pa_data->contents = enc_pa_data->data;
free(enc_pa_data); /* don't free contents */
*send_pa = pa_data;
return 0;
}
#endif
|