summaryrefslogtreecommitdiff
path: root/runtime/nsd_gtls.c
blob: 036e82901dd1cfd62bd7c94765996890604a9978 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
/* nsd_gtls.c
 *
 * An implementation of the nsd interface for GnuTLS.
 * 
 * Copyright (C) 2007, 2008 Rainer Gerhards and Adiscon GmbH.
 *
 * This file is part of the rsyslog runtime library.
 *
 * The rsyslog runtime library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * The rsyslog runtime library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the rsyslog runtime library.  If not, see <http://www.gnu.org/licenses/>.
 *
 * A copy of the GPL can be found in the file "COPYING" in this distribution.
 * A copy of the LGPL can be found in the file "COPYING.LESSER" in this distribution.
 */
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include <gcrypt.h>
#include <errno.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <pthread.h>

#include "rsyslog.h"
#include "syslogd-types.h"
#include "module-template.h"
#include "cfsysline.h"
#include "obj.h"
#include "stringbuf.h"
#include "errmsg.h"
#include "net.h"
#include "datetime.h"
#include "nsd_ptcp.h"
#include "nsdsel_gtls.h"
#include "nsd_gtls.h"

/* things to move to some better place/functionality - TODO */
#define DH_BITS 1024
#define CRLFILE "crl.pem"


GCRY_THREAD_OPTION_PTHREAD_IMPL;
MODULE_TYPE_LIB
MODULE_TYPE_KEEP

/* static data */
DEFobjStaticHelpers
DEFobjCurrIf(errmsg)
DEFobjCurrIf(glbl)
DEFobjCurrIf(net)
DEFobjCurrIf(datetime)
DEFobjCurrIf(nsd_ptcp)

static int bGlblSrvrInitDone = 0;	/**< 0 - server global init not yet done, 1 - already done */

static pthread_mutex_t mutGtlsStrerror; /**< a mutex protecting the potentially non-reentrant gtlStrerror() function */

/* a macro to check GnuTLS calls against unexpected errors */
#define CHKgnutls(x) \
	if((gnuRet = (x)) != 0) { \
		uchar *pErr = gtlsStrerror(gnuRet); \
		dbgprintf("unexpected GnuTLS error %d in %s:%d: %s\n", gnuRet, __FILE__, __LINE__, pErr); \
		free(pErr); \
		ABORT_FINALIZE(RS_RET_GNUTLS_ERR); \
	}


/* ------------------------------ GnuTLS specifics ------------------------------ */
static gnutls_certificate_credentials xcred;
static gnutls_dh_params dh_params;

#ifdef DEBUG
#if 0 /* uncomment, if needed some time again -- DEV Debug only */
/* This defines a log function to be provided to GnuTLS. It hopefully
 * helps us track down hard to find problems.
 * rgerhards, 2008-06-20
 */
static void logFunction(int level, const char *msg)
{
	dbgprintf("GnuTLS log msg, level %d: %s\n", level, msg);
}
#endif
#endif /* #ifdef DEBUG */


/* read in the whole content of a file. The caller is responsible for
 * freeing the buffer. To prevent DOS, this function can NOT read
 * files larger than 1MB (which still is *very* large).
 * rgerhards, 2008-05-26
 */
static rsRetVal
readFile(uchar *pszFile, gnutls_datum_t *pBuf)
{
	int fd;
	struct stat stat_st;
	DEFiRet;

	assert(pszFile != NULL);
	assert(pBuf != NULL);

	pBuf->data = NULL;

	if((fd = open((char*)pszFile, O_RDONLY)) == -1) {
		errmsg.LogError(0, RS_RET_FILE_NOT_FOUND, "can not read file '%s'", pszFile);
		ABORT_FINALIZE(RS_RET_FILE_NOT_FOUND);

	}

	if(fstat(fd, &stat_st) == -1) {
		errmsg.LogError(0, RS_RET_FILE_NO_STAT, "can not stat file '%s'", pszFile);
		ABORT_FINALIZE(RS_RET_FILE_NO_STAT);
	}
	
	/* 1MB limit */
	if(stat_st.st_size > 1024 * 1024) {
		errmsg.LogError(0, RS_RET_FILE_TOO_LARGE, "file '%s' too large, max 1MB", pszFile);
		ABORT_FINALIZE(RS_RET_FILE_TOO_LARGE);
	}

	CHKmalloc(pBuf->data = MALLOC(stat_st.st_size));
	pBuf->size = stat_st.st_size;
	if(read(fd,  pBuf->data, stat_st.st_size) != stat_st.st_size) {
		errmsg.LogError(0, RS_RET_IO_ERROR, "error or incomplete read of file '%s'", pszFile);
		ABORT_FINALIZE(RS_RET_IO_ERROR);
	}

	close(fd);

finalize_it:
	if(iRet != RS_RET_OK) {
		if(pBuf->data != NULL) {
			free(pBuf->data);
			pBuf->data = NULL;
			pBuf->size = 0;
			}
	}
	RETiRet;
}


/* Load the certificate and the private key into our own store. We need to do
 * this in the client case, to support fingerprint authentication. In that case,
 * we may be presented no matching root certificate, but we must provide ours.
 * The only way to do that is via the cert callback interface, but for it we
 * need to load certificates into our private store.
 * rgerhards, 2008-05-26
 */
static rsRetVal
gtlsLoadOurCertKey(nsd_gtls_t *pThis)
{
	DEFiRet;
	int gnuRet;
	gnutls_datum_t data = { NULL, 0 };
	uchar *keyFile;
	uchar *certFile;

	ISOBJ_TYPE_assert(pThis, nsd_gtls);

	certFile = glbl.GetDfltNetstrmDrvrCertFile();
	keyFile = glbl.GetDfltNetstrmDrvrKeyFile();

	if(certFile == NULL || keyFile == NULL) {
		/* in this case, we can not set our certificate. If we are 
		 * a client and the server is running in "anon" auth mode, this
		 * may be well acceptable. In other cases, we will see some
		 * more error messages down the road. -- rgerhards, 2008-07-02
		 */
		dbgprintf("our certificate is not set, file name values are cert: '%s', key: '%s'\n",
			  certFile, keyFile);
		ABORT_FINALIZE(RS_RET_CERTLESS);
	}

	/* try load certificate */
	CHKiRet(readFile(certFile, &data));
	CHKgnutls(gnutls_x509_crt_init(&pThis->ourCert));
	pThis->bOurCertIsInit = 1;
	CHKgnutls(gnutls_x509_crt_import(pThis->ourCert, &data, GNUTLS_X509_FMT_PEM));
	free(data.data);
	data.data = NULL;

	/* try load private key */
	CHKiRet(readFile(keyFile, &data));
	CHKgnutls(gnutls_x509_privkey_init(&pThis->ourKey));
	pThis->bOurKeyIsInit = 1;
	CHKgnutls(gnutls_x509_privkey_import(pThis->ourKey, &data, GNUTLS_X509_FMT_PEM));
	free(data.data);

finalize_it:
	if(iRet != RS_RET_OK) {
		if(data.data != NULL)
			free(data.data);
		if(pThis->bOurCertIsInit) {
			gnutls_x509_crt_deinit(pThis->ourCert);
			pThis->bOurCertIsInit = 0;
		}
		if(pThis->bOurKeyIsInit) {
			gnutls_x509_privkey_deinit(pThis->ourKey);
			pThis->bOurKeyIsInit = 0;
		}
	}
	RETiRet;
}


/* This callback must be associated with a session by calling
 * gnutls_certificate_client_set_retrieve_function(session, cert_callback),
 * before a handshake. We will always return the configured certificate,
 * even if it does not match the peer's trusted CAs. This is necessary
 * to use self-signed certs in fingerprint mode. And, yes, this usage
 * of the callback is quite a hack. But it seems the only way to
 * obey to the IETF -transport-tls I-D.
 * Note: GnuTLS requires the function to return 0 on success and
 * -1 on failure.
 * rgerhards, 2008-05-27
 */
static int
gtlsClientCertCallback(gnutls_session session,
              __attribute__((unused)) const gnutls_datum* req_ca_rdn, int __attribute__((unused)) nreqs,
              __attribute__((unused)) const gnutls_pk_algorithm* sign_algos, int __attribute__((unused)) sign_algos_length,
              gnutls_retr_st *st)
{
	nsd_gtls_t *pThis;

	pThis = (nsd_gtls_t*) gnutls_session_get_ptr(session);

	st->type = GNUTLS_CRT_X509;
	st->ncerts = 1;
	st->cert.x509 = &pThis->ourCert;
	st->key.x509 = pThis->ourKey;
	st->deinit_all = 0;

	return 0;
}


/* This function extracts some information about this session's peer
 * certificate. Works for X.509 certificates only. Adds all
 * of the info to a cstr_t, which is handed over to the caller.
 * Caller must destruct it when no longer needed.
 * rgerhards, 2008-05-21
 */
static rsRetVal
gtlsGetCertInfo(nsd_gtls_t *pThis, cstr_t **ppStr)
{
	char dn[128];
	uchar lnBuf[256];
	size_t size;
	unsigned int algo, bits;
	time_t expiration_time, activation_time;
	const gnutls_datum *cert_list;
	unsigned cert_list_size = 0;
	gnutls_x509_crt cert;
	cstr_t *pStr = NULL;
	int gnuRet;
	DEFiRet;
	unsigned iAltName;
	size_t szAltNameLen;
	char szAltName[1024]; /* this is sufficient for the DNSNAME... */

	assert(ppStr != NULL);
	ISOBJ_TYPE_assert(pThis, nsd_gtls);

	if(gnutls_certificate_type_get(pThis->sess) != GNUTLS_CRT_X509)
		return RS_RET_TLS_CERT_ERR;

	cert_list = gnutls_certificate_get_peers(pThis->sess, &cert_list_size);

	CHKiRet(rsCStrConstruct(&pStr));

	snprintf((char*)lnBuf, sizeof(lnBuf), "peer provided %d certificate(s). ", cert_list_size);
	CHKiRet(rsCStrAppendStr(pStr, lnBuf));

	if(cert_list_size > 0) {
		/* we only print information about the first certificate */
		CHKgnutls(gnutls_x509_crt_init(&cert));
		CHKgnutls(gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER));

		CHKiRet(rsCStrAppendStr(pStr, (uchar*)"Certificate 1 info: "));

		expiration_time = gnutls_x509_crt_get_expiration_time(cert);
		activation_time = gnutls_x509_crt_get_activation_time(cert);
		ctime_r(&activation_time, dn);
		dn[strlen(dn) - 1] = '\0'; /* strip linefeed */
		snprintf((char*)lnBuf, sizeof(lnBuf), "certificate valid from %s ", dn);
		CHKiRet(rsCStrAppendStr(pStr, lnBuf));

		ctime_r(&expiration_time, dn);
		dn[strlen(dn) - 1] = '\0'; /* strip linefeed */
		snprintf((char*)lnBuf, sizeof(lnBuf), "to %s; ", dn);
		CHKiRet(rsCStrAppendStr(pStr, lnBuf));

		/* Extract some of the public key algorithm's parameters */
		algo = gnutls_x509_crt_get_pk_algorithm(cert, &bits);

		snprintf((char*)lnBuf, sizeof(lnBuf), "Certificate public key: %s; ",
			 gnutls_pk_algorithm_get_name(algo));
		CHKiRet(rsCStrAppendStr(pStr, lnBuf));

		/* names */
		size = sizeof(dn);
		gnutls_x509_crt_get_dn(cert, dn, &size);
		snprintf((char*)lnBuf, sizeof(lnBuf), "DN: %s; ", dn);
		CHKiRet(rsCStrAppendStr(pStr, lnBuf));

		size = sizeof(dn);
		gnutls_x509_crt_get_issuer_dn(cert, dn, &size);
		snprintf((char*)lnBuf, sizeof(lnBuf), "Issuer DN: %s; ", dn);
		CHKiRet(rsCStrAppendStr(pStr, lnBuf));

		/* dNSName alt name */
		iAltName = 0;
		while(1) { /* loop broken below */
			szAltNameLen = sizeof(szAltName);
			gnuRet = gnutls_x509_crt_get_subject_alt_name(cert, iAltName,
					szAltName, &szAltNameLen, NULL);
			if(gnuRet < 0)
				break;
			else if(gnuRet == GNUTLS_SAN_DNSNAME) {
				/* we found it! */
				snprintf((char*)lnBuf, sizeof(lnBuf), "SAN:DNSname: %s; ", szAltName);
				CHKiRet(rsCStrAppendStr(pStr, lnBuf));
				/* do NOT break, because there may be multiple dNSName's! */
			}
			++iAltName;
		}

		gnutls_x509_crt_deinit(cert);
	}

	CHKiRet(cstrFinalize(pStr));
	*ppStr = pStr;

finalize_it:
	if(iRet != RS_RET_OK) {
		if(pStr != NULL)
			rsCStrDestruct(&pStr);
	}

	RETiRet;
}



#if 0 /* we may need this in the future - code needs to be looked at then! */
/* This function will print some details of the
 * given pThis->sess.
 */
static rsRetVal
print_info(nsd_gtls_t *pThis)
{
	const char *tmp;
	gnutls_credentials_type cred;
	gnutls_kx_algorithm kx;
	DEFiRet;

	ISOBJ_TYPE_assert(pThis, nsd_gtls);
	/* print the key exchange's algorithm name
	*/
	kx = gnutls_kx_get(pThis->sess);
	tmp = gnutls_kx_get_name(kx);
	dbgprintf("- Key Exchange: %s\n", tmp);

	/* Check the authentication type used and switch
	* to the appropriate.
	*/
	cred = gnutls_auth_get_type(pThis->sess);
	switch (cred) {
	case GNUTLS_CRD_ANON:       /* anonymous authentication */
		dbgprintf("- Anonymous DH using prime of %d bits\n",
		gnutls_dh_get_prime_bits(pThis->sess));
		break;
	case GNUTLS_CRD_CERTIFICATE:        /* certificate authentication */
		/* Check if we have been using ephemeral Diffie Hellman.
		*/
		if (kx == GNUTLS_KX_DHE_RSA || kx == GNUTLS_KX_DHE_DSS) {
		 dbgprintf("\n- Ephemeral DH using prime of %d bits\n",
			gnutls_dh_get_prime_bits(pThis->sess));
		}

		/* if the certificate list is available, then
		* print some information about it.
		*/
		gtlsPrintCert(pThis);
		break;
	case GNUTLS_CRD_SRP:        /* certificate authentication */
		dbgprintf("GNUTLS_CRD_SRP/IA");
		break;
	case GNUTLS_CRD_PSK:        /* certificate authentication */
		dbgprintf("GNUTLS_CRD_PSK");
		break;
	case GNUTLS_CRD_IA:        /* certificate authentication */
		dbgprintf("GNUTLS_CRD_IA");
		break;
	} /* switch */

	/* print the protocol's name (ie TLS 1.0) */
	tmp = gnutls_protocol_get_name(gnutls_protocol_get_version(pThis->sess));
	dbgprintf("- Protocol: %s\n", tmp);

	/* print the certificate type of the peer.
	* ie X.509
	*/
	tmp = gnutls_certificate_type_get_name(
	gnutls_certificate_type_get(pThis->sess));

	dbgprintf("- Certificate Type: %s\n", tmp);

	/* print the compression algorithm (if any)
	*/
	tmp = gnutls_compression_get_name( gnutls_compression_get(pThis->sess));
	dbgprintf("- Compression: %s\n", tmp);

	/* print the name of the cipher used.
	* ie 3DES.
	*/
	tmp = gnutls_cipher_get_name(gnutls_cipher_get(pThis->sess));
	dbgprintf("- Cipher: %s\n", tmp);

	/* Print the MAC algorithms name.
	* ie SHA1
	*/
	tmp = gnutls_mac_get_name(gnutls_mac_get(pThis->sess));
	dbgprintf("- MAC: %s\n", tmp);

	RETiRet;
}
#endif


/* Convert a fingerprint to printable data. The  conversion is carried out
 * according IETF I-D syslog-transport-tls-12. The fingerprint string is
 * returned in a new cstr object. It is the caller's responsibility to
 * destruct that object.
 * rgerhards, 2008-05-08
 */
static rsRetVal
GenFingerprintStr(uchar *pFingerprint, size_t sizeFingerprint, cstr_t **ppStr)
{
	cstr_t *pStr = NULL;
	uchar buf[4];
	size_t i;
	DEFiRet;

	CHKiRet(rsCStrConstruct(&pStr));
	CHKiRet(rsCStrAppendStrWithLen(pStr, (uchar*)"SHA1", 4));
	for(i = 0 ; i < sizeFingerprint ; ++i) {
		snprintf((char*)buf, sizeof(buf), ":%2.2X", pFingerprint[i]);
		CHKiRet(rsCStrAppendStrWithLen(pStr, buf, 3));
	}
	CHKiRet(cstrFinalize(pStr));

	*ppStr = pStr;

finalize_it:
	if(iRet != RS_RET_OK) {
		if(pStr != NULL)
			rsCStrDestruct(&pStr);
	}
	RETiRet;
}


/* a thread-safe variant of gnutls_strerror
 * The caller must free the returned string.
 * rgerhards, 2008-04-30
 */
uchar *gtlsStrerror(int error)
{
	uchar *pErr;

	pthread_mutex_lock(&mutGtlsStrerror);
	pErr = (uchar*) strdup(gnutls_strerror(error));
	pthread_mutex_unlock(&mutGtlsStrerror);

	return pErr;
}


/* try to receive a record from the remote peer. This works with
 * our own abstraction and handles local buffering and EAGAIN.
 * See details on local buffering in Rcv(9 header-comment.
 * This function MUST only be called when the local buffer is
 * empty. Calling it otherwise will cause losss of current buffer
 * data.
 * rgerhards, 2008-06-24
 */
rsRetVal
gtlsRecordRecv(nsd_gtls_t *pThis)
{
	ssize_t lenRcvd;
	DEFiRet;

	ISOBJ_TYPE_assert(pThis, nsd_gtls);
	lenRcvd = gnutls_record_recv(pThis->sess, pThis->pszRcvBuf, NSD_GTLS_MAX_RCVBUF);
	if(lenRcvd >= 0) {
		pThis->lenRcvBuf = lenRcvd;
		pThis->ptrRcvBuf = 0;
	} else if(lenRcvd == GNUTLS_E_AGAIN || lenRcvd == GNUTLS_E_INTERRUPTED) {
		pThis->rtryCall = gtlsRtry_recv;
		dbgprintf("GnuTLS receive requires a retry (this most probably is OK and no error condition)\n");
		ABORT_FINALIZE(RS_RET_RETRY);
	} else {
		int gnuRet; /* TODO: build a specific function for GnuTLS error reporting */
		CHKgnutls(lenRcvd); /* this will abort the function */
	}

finalize_it:
	dbgprintf("gtlsRecordRecv return. nsd %p, iRet %d, lenRcvd %d, lenRcvBuf %d, ptrRcvBuf %d\n", pThis, iRet, (int) lenRcvd, pThis->lenRcvBuf, pThis->ptrRcvBuf);
	RETiRet;
}


/* add our own certificate to the certificate set, so that the peer
 * can identify us. Please note that we try to use mutual authentication,
 * so we always add a cert, even if we are in the client role (later,
 * this may be controlled by a config setting).
 * rgerhards, 2008-05-15
 */
static rsRetVal
gtlsAddOurCert(void)
{
	int gnuRet;
	uchar *keyFile;
	uchar *certFile;
	uchar *pGnuErr; /* for GnuTLS error reporting */
	DEFiRet;

	certFile = glbl.GetDfltNetstrmDrvrCertFile();
	keyFile = glbl.GetDfltNetstrmDrvrKeyFile();
	dbgprintf("GTLS certificate file: '%s'\n", certFile);
	dbgprintf("GTLS key file: '%s'\n", keyFile);
	CHKgnutls(gnutls_certificate_set_x509_key_file(xcred, (char*)certFile, (char*)keyFile, GNUTLS_X509_FMT_PEM));

finalize_it:
	if(iRet != RS_RET_OK) {
		pGnuErr = gtlsStrerror(gnuRet);
		errno = 0;
		errmsg.LogError(0, iRet, "error adding our certificate. GnuTLS error %d, message: '%s', "
				"key: '%s', cert: '%s'", gnuRet, pGnuErr, keyFile, certFile);
		free(pGnuErr);
	}
	RETiRet;
}


/* globally initialize GnuTLS */
static rsRetVal
gtlsGlblInit(void)
{
	int gnuRet;
	uchar *cafile;
	DEFiRet;

	/* gcry_control must be called first, so that the thread system is correctly set up */
	gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
	CHKgnutls(gnutls_global_init());
	
	/* X509 stuff */
	CHKgnutls(gnutls_certificate_allocate_credentials(&xcred));

	/* sets the trusted cas file */
	cafile = glbl.GetDfltNetstrmDrvrCAF();
	dbgprintf("GTLS CA file: '%s'\n", cafile);
	gnuRet = gnutls_certificate_set_x509_trust_file(xcred, (char*)cafile, GNUTLS_X509_FMT_PEM);
	if(gnuRet < 0) {
		/* TODO; a more generic error-tracking function (this one based on CHKgnutls()) */
		uchar *pErr = gtlsStrerror(gnuRet);
		dbgprintf("unexpected GnuTLS error %d in %s:%d: %s\n", gnuRet, __FILE__, __LINE__, pErr);
		free(pErr);
		ABORT_FINALIZE(RS_RET_GNUTLS_ERR);
	}

#	ifdef DEBUG
#if 	0 /* do this in special cases only. WARNING: if active, it may reveal sensitive information! */
	/* intialize log function - set a level only for hard-to-find bugs */
	gnutls_global_set_log_function(logFunction);
	gnutls_global_set_log_level(10); /* 0 (no) to 9 (most), 10 everything */
#	endif
#	endif

finalize_it:
	RETiRet;
}

static rsRetVal
gtlsInitSession(nsd_gtls_t *pThis)
{
	DEFiRet;
	int gnuRet;
	gnutls_session session;

	gnutls_init(&session, GNUTLS_SERVER);
	pThis->bHaveSess = 1;
	pThis->bIsInitiator = 0;

	/* avoid calling all the priority functions, since the defaults are adequate. */
	CHKgnutls(gnutls_set_default_priority(session));
	CHKgnutls(gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, xcred));

	/* request client certificate if any.  */
	gnutls_certificate_server_set_request( session, GNUTLS_CERT_REQUEST);
	gnutls_dh_set_prime_bits(session, DH_BITS);

	pThis->sess = session;

finalize_it:
	RETiRet;
}


static rsRetVal
generate_dh_params(void)
{
	int gnuRet;
	DEFiRet;
	/* Generate Diffie Hellman parameters - for use with DHE
	 * kx algorithms. These should be discarded and regenerated
	 * once a day, once a week or once a month. Depending on the
	 * security requirements.
	 */
	CHKgnutls(gnutls_dh_params_init( &dh_params));
	CHKgnutls(gnutls_dh_params_generate2( dh_params, DH_BITS));
finalize_it:
	RETiRet;
}


/* set up all global things that are needed for server operations
 * rgerhards, 2008-04-30
 */
static rsRetVal
gtlsGlblInitLstn(void)
{
	DEFiRet;

	if(bGlblSrvrInitDone == 0) {
		/* we do not use CRLs right now, and I doubt we'll ever do. This functionality is
		 * considered legacy. -- rgerhards, 2008-05-05
		 */
		/*CHKgnutls(gnutls_certificate_set_x509_crl_file(xcred, CRLFILE, GNUTLS_X509_FMT_PEM));*/
		CHKiRet(generate_dh_params());
		gnutls_certificate_set_dh_params(xcred, dh_params); /* this is void */
		bGlblSrvrInitDone = 1; /* we are all set now */

		/* now we need to add our certificate */
		CHKiRet(gtlsAddOurCert());
	}

finalize_it:
	RETiRet;
}


/* Obtain the CN from the DN field and hand it back to the caller
 * (which is responsible for destructing it). We try to follow 
 * RFC2253 as far as it makes sense for our use-case. This function
 * is considered a compromise providing good-enough correctness while
 * limiting code size and complexity. If a problem occurs, we may enhance
 * this function. A (pointer to a) certificate must be caller-provided.
 * If no CN is contained in the cert, no string is returned
 * (*ppstrCN remains NULL). *ppstrCN MUST be NULL on entry!
 * rgerhards, 2008-05-22
 */
static rsRetVal
gtlsGetCN(nsd_gtls_t *pThis, gnutls_x509_crt *pCert, cstr_t **ppstrCN)
{
	DEFiRet;
	int gnuRet;
	int i;
	int bFound;
	cstr_t *pstrCN = NULL;
	size_t size;
	/* big var the last, so we hope to have all we usually neeed within one mem cache line */
	uchar szDN[1024]; /* this should really be large enough for any non-malicious case... */

	ISOBJ_TYPE_assert(pThis, nsd_gtls);
	assert(pCert != NULL);
	assert(ppstrCN != NULL);
	assert(*ppstrCN == NULL);

	size = sizeof(szDN);
	CHKgnutls(gnutls_x509_crt_get_dn(*pCert, (char*)szDN, &size));

	/* now search for the CN part */
	i = 0;
	bFound = 0;
	while(!bFound && szDN[i] != '\0') {
		/* note that we do not overrun our string due to boolean shortcut
		 * operations. If we have '\0', the if does not match and evaluation
		 * stops. Order of checks is obviously important!
		 */
		if(szDN[i] == 'C' && szDN[i+1] == 'N' && szDN[i+2] == '=') {
			bFound = 1;
			i += 2;
		}
		i++;

	}

	if(!bFound) {
		FINALIZE; /* we are done */
	}

	/* we found a common name, now extract it */
	CHKiRet(cstrConstruct(&pstrCN));
	while(szDN[i] != '\0' && szDN[i] != ',') {
		if(szDN[i] == '\\') {
			/* hex escapes are not implemented */
			++i; /* escape char processed */
			if(szDN[i] == '\0')
				ABORT_FINALIZE(RS_RET_CERT_INVALID_DN);
			CHKiRet(cstrAppendChar(pstrCN, szDN[i]));
		} else {
			CHKiRet(cstrAppendChar(pstrCN, szDN[i]));
		}
		++i; /* char processed */
	}
	CHKiRet(cstrFinalize(pstrCN));

	/* we got it - we ignore the rest of the DN string (if any). So we may
	 * not detect if it contains more than one CN
	 */

	*ppstrCN = pstrCN;

finalize_it:
	if(iRet != RS_RET_OK) {
		if(pstrCN != NULL)
			cstrDestruct(&pstrCN);
	}

	RETiRet;
}


/* Check the peer's ID in fingerprint auth mode.
 * rgerhards, 2008-05-22
 */
static rsRetVal
gtlsChkPeerFingerprint(nsd_gtls_t *pThis, gnutls_x509_crt *pCert)
{
	uchar fingerprint[20];
	size_t size;
	cstr_t *pstrFingerprint = NULL;
	int bFoundPositiveMatch;
	permittedPeers_t *pPeer;
	int gnuRet;
	DEFiRet;

	ISOBJ_TYPE_assert(pThis, nsd_gtls);

	/* obtain the SHA1 fingerprint */
	size = sizeof(fingerprint);
	CHKgnutls(gnutls_x509_crt_get_fingerprint(*pCert, GNUTLS_DIG_SHA1, fingerprint, &size));
	CHKiRet(GenFingerprintStr(fingerprint, size, &pstrFingerprint));
	dbgprintf("peer's certificate SHA1 fingerprint: %s\n", cstrGetSzStr(pstrFingerprint));

	/* now search through the permitted peers to see if we can find a permitted one */
	bFoundPositiveMatch = 0;
	pPeer = pThis->pPermPeers;
	while(pPeer != NULL && !bFoundPositiveMatch) {
		if(!rsCStrSzStrCmp(pstrFingerprint, pPeer->pszID, strlen((char*) pPeer->pszID))) {
			bFoundPositiveMatch = 1;
		} else {
			pPeer = pPeer->pNext;
		}
	}

	if(!bFoundPositiveMatch) {
		dbgprintf("invalid peer fingerprint, not permitted to talk to it\n");
		if(pThis->bReportAuthErr == 1) {
			errno = 0;
			errmsg.LogError(0, RS_RET_INVALID_FINGERPRINT, "error: peer fingerprint '%s' unknown - we are "
					"not permitted to talk to it", cstrGetSzStr(pstrFingerprint));
			pThis->bReportAuthErr = 0;
		}
		ABORT_FINALIZE(RS_RET_INVALID_FINGERPRINT);
	}

finalize_it:
	if(pstrFingerprint != NULL)
		cstrDestruct(&pstrFingerprint);
	RETiRet;
}


/* Perform a match on ONE peer name obtained from the certificate. This name
 * is checked against the set of configured credentials. *pbFoundPositiveMatch is
 * set to 1 if the ID matches. *pbFoundPositiveMatch must have been initialized
 * to 0 by the caller (this is a performance enhancement as we expect to be
 * called multiple times).
 * TODO: implemet wildcards?
 * rgerhards, 2008-05-26
 */
static rsRetVal
gtlsChkOnePeerName(nsd_gtls_t *pThis, uchar *pszPeerID, int *pbFoundPositiveMatch)
{
	permittedPeers_t *pPeer;
	DEFiRet;

	ISOBJ_TYPE_assert(pThis, nsd_gtls);
	assert(pszPeerID != NULL);
	assert(pbFoundPositiveMatch != NULL);

	if(pThis->pPermPeers) { /* do we have configured peer IDs? */
		pPeer = pThis->pPermPeers;
		while(pPeer != NULL) {
			CHKiRet(net.PermittedPeerWildcardMatch(pPeer, pszPeerID, pbFoundPositiveMatch));
			if(*pbFoundPositiveMatch)
				break;
			pPeer = pPeer->pNext;
		}
	} else {
		/* we do not have configured peer IDs, so we use defaults */
		if(   pThis->pszConnectHost
		   && !strcmp((char*)pszPeerID, (char*)pThis->pszConnectHost)) {
			*pbFoundPositiveMatch = 1;
		}
	}

finalize_it:
	RETiRet;
}


/* Check the peer's ID in name auth mode.
 * rgerhards, 2008-05-22
 */
static rsRetVal
gtlsChkPeerName(nsd_gtls_t *pThis, gnutls_x509_crt *pCert)
{
	uchar lnBuf[256];
	char szAltName[1024]; /* this is sufficient for the DNSNAME... */
	int iAltName;
	size_t szAltNameLen;
	int bFoundPositiveMatch;
	cstr_t *pStr = NULL;
	cstr_t *pstrCN = NULL;
	int gnuRet;
	DEFiRet;

	ISOBJ_TYPE_assert(pThis, nsd_gtls);

	bFoundPositiveMatch = 0;
	CHKiRet(rsCStrConstruct(&pStr));

	/* first search through the dNSName subject alt names */
	iAltName = 0;
	while(!bFoundPositiveMatch) { /* loop broken below */
		szAltNameLen = sizeof(szAltName);
		gnuRet = gnutls_x509_crt_get_subject_alt_name(*pCert, iAltName,
				szAltName, &szAltNameLen, NULL);
		if(gnuRet < 0)
			break;
		else if(gnuRet == GNUTLS_SAN_DNSNAME) {
			dbgprintf("subject alt dnsName: '%s'\n", szAltName);
			snprintf((char*)lnBuf, sizeof(lnBuf), "DNSname: %s; ", szAltName);
			CHKiRet(rsCStrAppendStr(pStr, lnBuf));
			CHKiRet(gtlsChkOnePeerName(pThis, (uchar*)szAltName, &bFoundPositiveMatch));
			/* do NOT break, because there may be multiple dNSName's! */
		}
		++iAltName;
	}

	if(!bFoundPositiveMatch) {
		/* if we did not succeed so far, we try the CN part of the DN... */
		CHKiRet(gtlsGetCN(pThis, pCert, &pstrCN));
		if(pstrCN != NULL) { /* NULL if there was no CN present */
			dbgprintf("gtls now checking auth for CN '%s'\n", cstrGetSzStr(pstrCN));
			snprintf((char*)lnBuf, sizeof(lnBuf), "CN: %s; ", cstrGetSzStr(pstrCN));
			CHKiRet(rsCStrAppendStr(pStr, lnBuf));
			CHKiRet(gtlsChkOnePeerName(pThis, cstrGetSzStr(pstrCN), &bFoundPositiveMatch));
		}
	}

	if(!bFoundPositiveMatch) {
		dbgprintf("invalid peer name, not permitted to talk to it\n");
		if(pThis->bReportAuthErr == 1) {
			CHKiRet(cstrFinalize(pStr));
			errno = 0;
			errmsg.LogError(0, RS_RET_INVALID_FINGERPRINT, "error: peer name not authorized -  "
					"not permitted to talk to it. Names: %s",
					cstrGetSzStr(pStr));
			pThis->bReportAuthErr = 0;
		}
		ABORT_FINALIZE(RS_RET_INVALID_FINGERPRINT);
	}

finalize_it:
	if(pStr != NULL)
		rsCStrDestruct(&pStr);
	if(pstrCN != NULL)
		rsCStrDestruct(&pstrCN);
	RETiRet;
}


/* check the ID of the remote peer - used for both fingerprint and
 * name authentication. This is common code. Will call into specific
 * drivers once the certificate has been obtained.
 * rgerhards, 2008-05-08
 */
static rsRetVal
gtlsChkPeerID(nsd_gtls_t *pThis)
{
	const gnutls_datum *cert_list;
	unsigned int list_size = 0;
	gnutls_x509_crt cert;
	int bMustDeinitCert = 0;
	int gnuRet;
	DEFiRet;

	ISOBJ_TYPE_assert(pThis, nsd_gtls);

	/* This function only works for X.509 certificates.  */
	if(gnutls_certificate_type_get(pThis->sess) != GNUTLS_CRT_X509)
		return RS_RET_TLS_CERT_ERR;

	cert_list = gnutls_certificate_get_peers(pThis->sess, &list_size);

	if(list_size < 1) {
		if(pThis->bReportAuthErr == 1) {
			errno = 0;
			errmsg.LogError(0, RS_RET_TLS_NO_CERT, "error: peer did not provide a certificate, "
					"not permitted to talk to it");
			pThis->bReportAuthErr = 0;
		}
		ABORT_FINALIZE(RS_RET_TLS_NO_CERT);
	}

	/* If we reach this point, we have at least one valid certificate. 
	 * We always use only the first certificate. As of GnuTLS documentation, the
	 * first certificate always contains the remote peer's own certificate. All other
	 * certificates are issuer's certificates (up the chain). We are only interested
	 * in the first certificate, which is our peer. -- rgerhards, 2008-05-08
	 */
	CHKgnutls(gnutls_x509_crt_init(&cert));
	bMustDeinitCert = 1; /* indicate cert is initialized and must be freed on exit */
	CHKgnutls(gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER));

	/* Now we see which actual authentication code we must call.  */
	if(pThis->authMode == GTLS_AUTH_CERTFINGERPRINT) {
		CHKiRet(gtlsChkPeerFingerprint(pThis, &cert));
	} else {
		assert(pThis->authMode == GTLS_AUTH_CERTNAME);
		CHKiRet(gtlsChkPeerName(pThis, &cert));
	}

finalize_it:
	if(bMustDeinitCert)
		gnutls_x509_crt_deinit(cert);

	RETiRet;
}


/* Verify the validity of the remote peer's certificate.
 * rgerhards, 2008-05-21
 */
static rsRetVal
gtlsChkPeerCertValidity(nsd_gtls_t *pThis)
{
	DEFiRet;
	char *pszErrCause;
	int gnuRet;
	cstr_t *pStr;
	unsigned stateCert;
	const gnutls_datum *cert_list;
	unsigned cert_list_size = 0;
	gnutls_x509_crt cert;
	unsigned i;
	time_t ttCert;
	time_t ttNow;

	ISOBJ_TYPE_assert(pThis, nsd_gtls);

	/* check if we have at least one cert */
	cert_list = gnutls_certificate_get_peers(pThis->sess, &cert_list_size);
	if(cert_list_size < 1) {
		errno = 0;
		errmsg.LogError(0, RS_RET_TLS_NO_CERT, "peer did not provide a certificate, not permitted to talk to it");
		ABORT_FINALIZE(RS_RET_TLS_NO_CERT);
	}

	CHKgnutls(gnutls_certificate_verify_peers2(pThis->sess, &stateCert));

	if(stateCert & GNUTLS_CERT_INVALID) {
		/* provide error details if we have them */
		if(stateCert & GNUTLS_CERT_SIGNER_NOT_FOUND) {
			pszErrCause = "signer not found";
		} else if(stateCert & GNUTLS_CERT_SIGNER_NOT_CA) {
			pszErrCause = "signer is not a CA";
		} else if(stateCert & GNUTLS_CERT_INSECURE_ALGORITHM) {
			pszErrCause = "insecure algorithm";
		} else if(stateCert & GNUTLS_CERT_REVOKED) {
			pszErrCause = "certificate revoked";
		} else {
			pszErrCause = "GnuTLS returned no specific reason";
			dbgprintf("GnuTLS returned no specific reason for GNUTLS_CERT_INVALID, certificate "
				 "status is %d\n", stateCert);
		}
		errmsg.LogError(0, NO_ERRCODE, "not permitted to talk to peer, certificate invalid: %s",
				pszErrCause);
		gtlsGetCertInfo(pThis, &pStr);
		errmsg.LogError(0, NO_ERRCODE, "invalid cert info: %s", cstrGetSzStr(pStr));
		cstrDestruct(&pStr);
		ABORT_FINALIZE(RS_RET_CERT_INVALID);
	}

	/* get current time for certificate validation */
	if(datetime.GetTime(&ttNow) == -1)
		ABORT_FINALIZE(RS_RET_SYS_ERR);

	/* as it looks, we need to validate the expiration dates ourselves...
	 * We need to loop through all certificates as we need to make sure the
	 * interim certificates are also not expired.
	 */
	for(i = 0 ; i < cert_list_size ; ++i) {
		CHKgnutls(gnutls_x509_crt_init(&cert));
		CHKgnutls(gnutls_x509_crt_import(cert, &cert_list[i], GNUTLS_X509_FMT_DER));
		ttCert = gnutls_x509_crt_get_activation_time(cert);
		if(ttCert == -1)
			ABORT_FINALIZE(RS_RET_TLS_CERT_ERR);
		else if(ttCert > ttNow) {
			errmsg.LogError(0, RS_RET_CERT_NOT_YET_ACTIVE, "not permitted to talk to peer: certificate %d not yet active", i);
			gtlsGetCertInfo(pThis, &pStr);
			errmsg.LogError(0, RS_RET_CERT_NOT_YET_ACTIVE, "invalid cert info: %s", cstrGetSzStr(pStr));
			cstrDestruct(&pStr);
			ABORT_FINALIZE(RS_RET_CERT_NOT_YET_ACTIVE);
		}

		ttCert = gnutls_x509_crt_get_expiration_time(cert);
		if(ttCert == -1)
			ABORT_FINALIZE(RS_RET_TLS_CERT_ERR);
		else if(ttCert < ttNow) {
			errmsg.LogError(0, RS_RET_CERT_EXPIRED, "not permitted to talk to peer: certificate %d expired", i);
			gtlsGetCertInfo(pThis, &pStr);
			errmsg.LogError(0, RS_RET_CERT_EXPIRED, "invalid cert info: %s", cstrGetSzStr(pStr));
			cstrDestruct(&pStr);
			ABORT_FINALIZE(RS_RET_CERT_EXPIRED);
		}
		gnutls_x509_crt_deinit(cert);
	}

finalize_it:
	RETiRet;
}


/* check if it is OK to talk to the remote peer
 * rgerhards, 2008-05-21
 */
rsRetVal
gtlsChkPeerAuth(nsd_gtls_t *pThis)
{
	DEFiRet;

	ISOBJ_TYPE_assert(pThis, nsd_gtls);

	/* call the actual function based on current auth mode */
	switch(pThis->authMode) {
		case GTLS_AUTH_CERTNAME:
			/* if we check the name, we must ensure the cert is valid */
			CHKiRet(gtlsChkPeerCertValidity(pThis));
			CHKiRet(gtlsChkPeerID(pThis));
			break;
		case GTLS_AUTH_CERTFINGERPRINT:
			CHKiRet(gtlsChkPeerID(pThis));
			break;
		case GTLS_AUTH_CERTVALID:
			CHKiRet(gtlsChkPeerCertValidity(pThis));
			break;
		case GTLS_AUTH_CERTANON:
			FINALIZE;
			break;
	}

finalize_it:
	RETiRet;
}


/* globally de-initialize GnuTLS */
static rsRetVal
gtlsGlblExit(void)
{
	DEFiRet;
	/* X509 stuff */
	gnutls_certificate_free_credentials(xcred);
	gnutls_global_deinit(); /* we are done... */
	RETiRet;
}


/* end a GnuTLS session
 * The function checks if we have a session and ends it only if so. So it can
 * always be called, even if there currently is no session.
 */
static rsRetVal
gtlsEndSess(nsd_gtls_t *pThis)
{
	int gnuRet;
	DEFiRet;

	if(pThis->bHaveSess) {
		if(pThis->bIsInitiator) {
			gnuRet = gnutls_bye(pThis->sess, GNUTLS_SHUT_RDWR);
			while(gnuRet == GNUTLS_E_INTERRUPTED || gnuRet == GNUTLS_E_AGAIN) {
				gnuRet = gnutls_bye(pThis->sess, GNUTLS_SHUT_RDWR);
			}
		}
		gnutls_deinit(pThis->sess);
		pThis->bHaveSess = 0;
	}
	RETiRet;
}


/* a small wrapper for gnutls_transport_set_ptr(). The main intension for
 * creating this wrapper is to get the annoying "cast to pointer from different
 * size" compiler warning just once. There seems to be no way around it, see:
 * http://lists.gnu.org/archive/html/help-gnutls/2008-05/msg00000.html
 * rgerhards, 2008.05-07
 */
#pragma GCC diagnostic ignored "-Wint-to-pointer-cast"
static inline void
gtlsSetTransportPtr(nsd_gtls_t *pThis, int sock)
{
	/* Note: the compiler warning for the next line is OK - see header comment! */
	gnutls_transport_set_ptr(pThis->sess, (gnutls_transport_ptr_t) sock);
}
#pragma GCC diagnostic warning "-Wint-to-pointer-cast"

/* ---------------------------- end GnuTLS specifics ---------------------------- */


/* Standard-Constructor */
BEGINobjConstruct(nsd_gtls) /* be sure to specify the object type also in END macro! */
	iRet = nsd_ptcp.Construct(&pThis->pTcp);
	pThis->bReportAuthErr = 1;
ENDobjConstruct(nsd_gtls)


/* destructor for the nsd_gtls object */
BEGINobjDestruct(nsd_gtls) /* be sure to specify the object type also in END and CODESTART macros! */
CODESTARTobjDestruct(nsd_gtls)
	if(pThis->iMode == 1) {
		gtlsEndSess(pThis);
	}

	if(pThis->pTcp != NULL) {
		nsd_ptcp.Destruct(&pThis->pTcp);
	}

	if(pThis->pszConnectHost != NULL) {
		free(pThis->pszConnectHost);
	}

	if(pThis->pszRcvBuf == NULL) {
		free(pThis->pszRcvBuf);
	}

	if(pThis->bOurCertIsInit)
		gnutls_x509_crt_deinit(pThis->ourCert);
	if(pThis->bOurKeyIsInit)
		gnutls_x509_privkey_deinit(pThis->ourKey);
	if(pThis->bHaveSess)
		gnutls_deinit(pThis->sess);
ENDobjDestruct(nsd_gtls)


/* Set the driver mode. For us, this has the following meaning:
 * 0 - work in plain tcp mode, without tls (e.g. before a STARTTLS)
 * 1 - work in TLS mode
 * rgerhards, 2008-04-28
 */
static rsRetVal
SetMode(nsd_t *pNsd, int mode)
{
	DEFiRet;
	nsd_gtls_t *pThis = (nsd_gtls_t*) pNsd;

	ISOBJ_TYPE_assert((pThis), nsd_gtls);
	if(mode != 0 && mode != 1) {
		errmsg.LogError(0, RS_RET_INVALID_DRVR_MODE, "error: driver mode %d not supported by "
				"gtls netstream driver", mode);
		ABORT_FINALIZE(RS_RET_INVALID_DRVR_MODE);
	}

	pThis->iMode = mode;

finalize_it:
	RETiRet;
}


/* Set the authentication mode. For us, the following is supported:
 * anon - no certificate checks whatsoever (discouraged, but supported)
 * x509/certvalid - (just) check certificate validity
 * x509/fingerprint - certificate fingerprint
 * x509/name - cerfificate name check
 * mode == NULL is valid and defaults to x509/name
 * rgerhards, 2008-05-16
 */
static rsRetVal
SetAuthMode(nsd_t *pNsd, uchar *mode)
{
	DEFiRet;
	nsd_gtls_t *pThis = (nsd_gtls_t*) pNsd;

	ISOBJ_TYPE_assert((pThis), nsd_gtls);
	if(mode == NULL || !strcasecmp((char*)mode, "x509/name")) {
		pThis->authMode = GTLS_AUTH_CERTNAME;
	} else if(!strcasecmp((char*) mode, "x509/fingerprint")) {
		pThis->authMode = GTLS_AUTH_CERTFINGERPRINT;
	} else if(!strcasecmp((char*) mode, "x509/certvalid")) {
		pThis->authMode = GTLS_AUTH_CERTVALID;
	} else if(!strcasecmp((char*) mode, "anon")) {
		pThis->authMode = GTLS_AUTH_CERTANON;
	} else {
		errmsg.LogError(0, RS_RET_VALUE_NOT_SUPPORTED, "error: authentication mode '%s' not supported by "
				"gtls netstream driver", mode);
		ABORT_FINALIZE(RS_RET_VALUE_NOT_SUPPORTED);
	}

/* TODO: clear stored IDs! */

finalize_it:
	RETiRet;
}


/* Set permitted peers. It is depending on the auth mode if this are 
 * fingerprints or names. -- rgerhards, 2008-05-19
 */
static rsRetVal
SetPermPeers(nsd_t *pNsd, permittedPeers_t *pPermPeers)
{
	DEFiRet;
	nsd_gtls_t *pThis = (nsd_gtls_t*) pNsd;

	ISOBJ_TYPE_assert((pThis), nsd_gtls);
	if(pPermPeers == NULL)
		FINALIZE;

	if(pThis->authMode != GTLS_AUTH_CERTFINGERPRINT && pThis->authMode != GTLS_AUTH_CERTNAME) {
		errmsg.LogError(0, RS_RET_VALUE_NOT_IN_THIS_MODE, "authentication not supported by "
			"gtls netstream driver in the configured authentication mode - ignored");
		ABORT_FINALIZE(RS_RET_VALUE_NOT_IN_THIS_MODE);
	}

	pThis->pPermPeers = pPermPeers;

finalize_it:
	RETiRet;
}


/* Provide access to the underlying OS socket. This is primarily
 * useful for other drivers (like nsd_gtls) who utilize ourselfs
 * for some of their functionality. -- rgerhards, 2008-04-18
 */
static rsRetVal
SetSock(nsd_t *pNsd, int sock)
{
	DEFiRet;
	nsd_gtls_t *pThis = (nsd_gtls_t*) pNsd;

	ISOBJ_TYPE_assert((pThis), nsd_gtls);
	assert(sock >= 0);

	nsd_ptcp.SetSock(pThis->pTcp, sock);

	RETiRet;
}


/* abort a connection. This is meant to be called immediately
 * before the Destruct call. -- rgerhards, 2008-03-24
 */
static rsRetVal
Abort(nsd_t *pNsd)
{
	nsd_gtls_t *pThis = (nsd_gtls_t*) pNsd;
	DEFiRet;

	ISOBJ_TYPE_assert((pThis), nsd_gtls);

	if(pThis->iMode == 0) {
		nsd_ptcp.Abort(pThis->pTcp);
	}

	RETiRet;
}



/* initialize the tcp socket for a listner
 * Here, we use the ptcp driver - because there is nothing special
 * at this point with GnuTLS. Things become special once we accept
 * a session, but not during listener setup.
 * gerhards, 2008-04-25
 */
static rsRetVal
LstnInit(netstrms_t *pNS, void *pUsr, rsRetVal(*fAddLstn)(void*,netstrm_t*),
	 uchar *pLstnPort, uchar *pLstnIP, int iSessMax)
{
	DEFiRet;
	CHKiRet(gtlsGlblInitLstn());
	iRet = nsd_ptcp.LstnInit(pNS, pUsr, fAddLstn, pLstnPort, pLstnIP, iSessMax);
finalize_it:
	RETiRet;
}


/* This function checks if the connection is still alive - well, kind of...
 * This is a dummy here. For details, check function common in ptcp driver.
 * rgerhards, 2008-06-09
 */
static void
CheckConnection(nsd_t __attribute__((unused)) *pNsd)
{
	nsd_gtls_t *pThis = (nsd_gtls_t*) pNsd;
	ISOBJ_TYPE_assert(pThis, nsd_gtls);

	nsd_ptcp.CheckConnection(pThis->pTcp);
}


/* get the remote hostname. The returned hostname must be freed by the caller.
 * rgerhards, 2008-04-25
 */
static rsRetVal
GetRemoteHName(nsd_t *pNsd, uchar **ppszHName)
{
	DEFiRet;
	nsd_gtls_t *pThis = (nsd_gtls_t*) pNsd;
	ISOBJ_TYPE_assert(pThis, nsd_gtls);
	iRet = nsd_ptcp.GetRemoteHName(pThis->pTcp, ppszHName);
	RETiRet;
}


/* Provide access to the sockaddr_storage of the remote peer. This
 * is needed by the legacy ACL system. --- gerhards, 2008-12-01
 */
static rsRetVal
GetRemAddr(nsd_t *pNsd, struct sockaddr_storage **ppAddr)
{
	DEFiRet;
	nsd_gtls_t *pThis = (nsd_gtls_t*) pNsd;
	ISOBJ_TYPE_assert(pThis, nsd_gtls);
	iRet = nsd_ptcp.GetRemAddr(pThis->pTcp, ppAddr);
	RETiRet;
}


/* get the remote host's IP address. The returned string must be freed by the
 * caller. -- rgerhards, 2008-04-25
 */
static rsRetVal
GetRemoteIP(nsd_t *pNsd, uchar **ppszIP)
{
	DEFiRet;
	nsd_gtls_t *pThis = (nsd_gtls_t*) pNsd;
	ISOBJ_TYPE_assert(pThis, nsd_gtls);
	iRet = nsd_ptcp.GetRemoteIP(pThis->pTcp, ppszIP);
	RETiRet;
}


/* accept an incoming connection request - here, we do the usual accept
 * handling. TLS specific handling is done thereafter (and if we run in TLS
 * mode at this time).
 * rgerhards, 2008-04-25
 */
static rsRetVal
AcceptConnReq(nsd_t *pNsd, nsd_t **ppNew)
{
	DEFiRet;
	int gnuRet;
	nsd_gtls_t *pNew = NULL;
	nsd_gtls_t *pThis = (nsd_gtls_t*) pNsd;

	ISOBJ_TYPE_assert((pThis), nsd_gtls);
	CHKiRet(nsd_gtlsConstruct(&pNew)); // TODO: prevent construct/destruct!
	CHKiRet(nsd_ptcp.Destruct(&pNew->pTcp));
	CHKiRet(nsd_ptcp.AcceptConnReq(pThis->pTcp, &pNew->pTcp));
	
	if(pThis->iMode == 0) {
		/* we are in non-TLS mode, so we are done */
		*ppNew = (nsd_t*) pNew;
		FINALIZE;
	}

	/* if we reach this point, we are in TLS mode */
	CHKiRet(gtlsInitSession(pNew));
	gtlsSetTransportPtr(pNew, ((nsd_ptcp_t*) (pNew->pTcp))->sock);
	pNew->authMode = pThis->authMode;
	pNew->pPermPeers = pThis->pPermPeers;

	/* we now do the handshake. This is a bit complicated, because we are 
	 * on non-blocking sockets. Usually, the handshake will not complete
	 * immediately, so that we need to retry it some time later.
	 */
	gnuRet = gnutls_handshake(pNew->sess);
	if(gnuRet == GNUTLS_E_AGAIN || gnuRet == GNUTLS_E_INTERRUPTED) {
		pNew->rtryCall = gtlsRtry_handshake;
		dbgprintf("GnuTLS handshake does not complete immediately - setting to retry (this is OK and normal)\n");
	} else if(gnuRet == 0) {
		/* we got a handshake, now check authorization */
		CHKiRet(gtlsChkPeerAuth(pNew));
	} else {
		ABORT_FINALIZE(RS_RET_TLS_HANDSHAKE_ERR);
	}

	pNew->iMode = 1; /* this session is now in TLS mode! */

	*ppNew = (nsd_t*) pNew;

finalize_it:
	if(iRet != RS_RET_OK) {
		if(pNew != NULL)
			nsd_gtlsDestruct(&pNew);
	}
	RETiRet;
}


/* receive data from a tcp socket
 * The lenBuf parameter must contain the max buffer size on entry and contains
 * the number of octets read on exit. This function
 * never blocks, not even when called on a blocking socket. That is important
 * for client sockets, which are set to block during send, but should not
 * block when trying to read data. -- rgerhards, 2008-03-17
 * The function now follows the usual iRet calling sequence.
 * With GnuTLS, we may need to restart a recv() system call. If so, we need
 * to supply the SAME buffer on the retry. We can not assure this, as the
 * caller is free to call us with any buffer location (and in current
 * implementation, it is on the stack and extremely likely to change). To
 * work-around this problem, we allocate a buffer ourselfs and always receive
 * into that buffer. We pass data on to the caller only after we have received it.
 * To save some space, we allocate that internal buffer only when it is actually 
 * needed, which means when we reach this function for the first time. To keep
 * the algorithm simple, we always supply data only from the internal buffer,
 * even if it is a single byte. As we have a stream, the caller must be prepared
 * to accept messages in any order, so we do not need to take care about this.
 * Please note that the logic also forces us to do some "faking" in select(), as
 * we must provide a fake "is ready for readign" status if we have data inside our
 * buffer. -- rgerhards, 2008-06-23
 */
static rsRetVal
Rcv(nsd_t *pNsd, uchar *pBuf, ssize_t *pLenBuf)
{
	DEFiRet;
	ssize_t iBytesCopy; /* how many bytes are to be copied to the client buffer? */
	nsd_gtls_t *pThis = (nsd_gtls_t*) pNsd;
	ISOBJ_TYPE_assert(pThis, nsd_gtls);

	if(pThis->bAbortConn)
		ABORT_FINALIZE(RS_RET_CONNECTION_ABORTREQ);

	if(pThis->iMode == 0) {
		CHKiRet(nsd_ptcp.Rcv(pThis->pTcp, pBuf, pLenBuf));
		FINALIZE;
	}

	/* --- in TLS mode now --- */

	/* Buffer logic applies only if we are in TLS mode. Here we 
	 * assume that we will switch from plain to TLS, but never back. This
	 * assumption may be unsafe, but it is the model for the time being and I
	 * do not see any valid reason why we should switch back to plain TCP after
	 * we were in TLS mode. However, in that case we may lose something that
	 * is already in the receive buffer ... risk accepted. -- rgerhards, 2008-06-23
	 */

	if(pThis->pszRcvBuf == NULL) {
		/* we have no buffer, so we need to malloc one */
		CHKmalloc(pThis->pszRcvBuf = MALLOC(NSD_GTLS_MAX_RCVBUF));
		pThis->lenRcvBuf = -1;
	}

	/* now check if we have something in our buffer. If so, we satisfy
	 * the request from buffer contents.
	 */
	if(pThis->lenRcvBuf == -1) { /* no data present, must read */
		CHKiRet(gtlsRecordRecv(pThis));
	}

	if(pThis->lenRcvBuf == 0) { /* EOS */
		*pLenBuf = 0;
		/* in this case, we also need to free the receive buffer, if we
		 * allocated one. -- rgerhards, 2008-12-03
		 */
		if(pThis->pszRcvBuf != NULL) {
			free(pThis->pszRcvBuf);
			pThis->pszRcvBuf = NULL;
		}
		ABORT_FINALIZE(RS_RET_CLOSED);
	}

	/* if we reach this point, data is present in the buffer and must be copied */
	iBytesCopy = pThis->lenRcvBuf - pThis->ptrRcvBuf;
	if(iBytesCopy > *pLenBuf) {
		iBytesCopy = *pLenBuf;
	} else {
		pThis->lenRcvBuf = -1; /* buffer will be emptied below */
	}

	memcpy(pBuf, pThis->pszRcvBuf + pThis->ptrRcvBuf, iBytesCopy);
	pThis->ptrRcvBuf += iBytesCopy;
	*pLenBuf = iBytesCopy;

finalize_it:
	dbgprintf("gtlsRcv return. nsd %p, iRet %d, lenRcvBuf %d, ptrRcvBuf %d\n", pThis, iRet, pThis->lenRcvBuf, pThis->ptrRcvBuf);
	RETiRet;
}


/* send a buffer. On entry, pLenBuf contains the number of octets to
 * write. On exit, it contains the number of octets actually written.
 * If this number is lower than on entry, only a partial buffer has
 * been written.
 * rgerhards, 2008-03-19
 */
static rsRetVal
Send(nsd_t *pNsd, uchar *pBuf, ssize_t *pLenBuf)
{
	int iSent;
	nsd_gtls_t *pThis = (nsd_gtls_t*) pNsd;
	DEFiRet;
	ISOBJ_TYPE_assert(pThis, nsd_gtls);

	if(pThis->bAbortConn)
		ABORT_FINALIZE(RS_RET_CONNECTION_ABORTREQ);

	if(pThis->iMode == 0) {
		CHKiRet(nsd_ptcp.Send(pThis->pTcp, pBuf, pLenBuf));
		FINALIZE;
	}

	/* in TLS mode now */
	while(1) { /* loop broken inside */
		iSent = gnutls_record_send(pThis->sess, pBuf, *pLenBuf);
		if(iSent >= 0) {
			*pLenBuf = iSent;
			break;
		}
		if(iSent != GNUTLS_E_INTERRUPTED && iSent != GNUTLS_E_AGAIN) {
			dbgprintf("unexpected GnuTLS error %d in %s:%d\n", iSent, __FILE__, __LINE__);
			gnutls_perror(iSent); /* TODO: can we do better? */
			ABORT_FINALIZE(RS_RET_GNUTLS_ERR);
		}
	}

finalize_it:
	RETiRet;
}

/* Enable KEEPALIVE handling on the socket.
 * rgerhards, 2009-06-02
 */
static rsRetVal
EnableKeepAlive(nsd_t *pNsd)
{
	return nsd_ptcp.EnableKeepAlive(pNsd);
}



/* open a connection to a remote host (server). With GnuTLS, we always
 * open a plain tcp socket and then, if in TLS mode, do a handshake on it.
 * rgerhards, 2008-03-19
 */
static rsRetVal
Connect(nsd_t *pNsd, int family, uchar *port, uchar *host)
{
	nsd_gtls_t *pThis = (nsd_gtls_t*) pNsd;
	int sock;
	int gnuRet;
	/* TODO: later? static const int cert_type_priority[3] = { GNUTLS_CRT_X509, GNUTLS_CRT_OPENPGP, 0 };*/
	static const int cert_type_priority[2] = { GNUTLS_CRT_X509, 0 };
	DEFiRet;

	ISOBJ_TYPE_assert(pThis, nsd_gtls);
	assert(port != NULL);
	assert(host != NULL);

	CHKiRet(nsd_ptcp.Connect(pThis->pTcp, family, port, host));

	if(pThis->iMode == 0)
		FINALIZE;
	
	/* we reach this point if in TLS mode */
	CHKgnutls(gnutls_init(&pThis->sess, GNUTLS_CLIENT));
	pThis->bHaveSess = 1;
	pThis->bIsInitiator = 1;

	/* in the client case, we need to set a callback that ensures our certificate
	 * will be presented to the server even if it is not signed by one of the server's
	 * trusted roots. This is necessary to support fingerprint authentication.
	 */
	/* store a pointer to ourselfs (needed by callback) */
	gnutls_session_set_ptr(pThis->sess, (void*)pThis);
	iRet = gtlsLoadOurCertKey(pThis); /* first load .pem files */
	if(iRet == RS_RET_OK) {
		gnutls_certificate_client_set_retrieve_function(xcred, gtlsClientCertCallback);
	} else if(iRet != RS_RET_CERTLESS) {
		FINALIZE; /* we have an error case! */
	}

	/* Use default priorities */
	CHKgnutls(gnutls_set_default_priority(pThis->sess));
	CHKgnutls(gnutls_certificate_type_set_priority(pThis->sess, cert_type_priority));

	/* put the x509 credentials to the current session */
	CHKgnutls(gnutls_credentials_set(pThis->sess, GNUTLS_CRD_CERTIFICATE, xcred));

	/* assign the socket to GnuTls */
	CHKiRet(nsd_ptcp.GetSock(pThis->pTcp, &sock));
	gtlsSetTransportPtr(pThis, sock);

	/* we need to store the hostname as an alternate mean of authentication if no
	 * permitted peer names are given. Using the hostname is quite useful. It permits
	 * auto-configuration of security if a commen root cert is present. -- rgerhards, 2008-05-26
	 */
	CHKmalloc(pThis->pszConnectHost = (uchar*)strdup((char*)host));

	/* and perform the handshake */
	CHKgnutls(gnutls_handshake(pThis->sess));
	dbgprintf("GnuTLS handshake succeeded\n");

	/* now check if the remote peer is permitted to talk to us - ideally, we 
	 * should do this during the handshake, but GnuTLS does not yet provide 
	 * the necessary callbacks -- rgerhards, 2008-05-26
	 */
	CHKiRet(gtlsChkPeerAuth(pThis));

finalize_it:
	if(iRet != RS_RET_OK) {
		if(pThis->bHaveSess) {
			gnutls_deinit(pThis->sess);
			pThis->bHaveSess = 0;
		}
	}

	RETiRet;
}


/* queryInterface function */
BEGINobjQueryInterface(nsd_gtls)
CODESTARTobjQueryInterface(nsd_gtls)
	if(pIf->ifVersion != nsdCURR_IF_VERSION) {/* check for current version, increment on each change */
		ABORT_FINALIZE(RS_RET_INTERFACE_NOT_SUPPORTED);
	}

	/* ok, we have the right interface, so let's fill it
	 * Please note that we may also do some backwards-compatibility
	 * work here (if we can support an older interface version - that,
	 * of course, also affects the "if" above).
	 */
	pIf->Construct = (rsRetVal(*)(nsd_t**)) nsd_gtlsConstruct;
	pIf->Destruct = (rsRetVal(*)(nsd_t**)) nsd_gtlsDestruct;
	pIf->Abort = Abort;
	pIf->LstnInit = LstnInit;
	pIf->AcceptConnReq = AcceptConnReq;
	pIf->Rcv = Rcv;
	pIf->Send = Send;
	pIf->Connect = Connect;
	pIf->SetSock = SetSock;
	pIf->SetMode = SetMode;
	pIf->SetAuthMode = SetAuthMode;
	pIf->SetPermPeers =SetPermPeers;
	pIf->CheckConnection = CheckConnection;
	pIf->GetRemoteHName = GetRemoteHName;
	pIf->GetRemoteIP = GetRemoteIP;
	pIf->GetRemAddr = GetRemAddr;
	pIf->EnableKeepAlive = EnableKeepAlive;
finalize_it:
ENDobjQueryInterface(nsd_gtls)


/* exit our class
 */
BEGINObjClassExit(nsd_gtls, OBJ_IS_LOADABLE_MODULE) /* CHANGE class also in END MACRO! */
CODESTARTObjClassExit(nsd_gtls)
	gtlsGlblExit();	/* shut down GnuTLS */

	/* release objects we no longer need */
	objRelease(nsd_ptcp, LM_NSD_PTCP_FILENAME);
	objRelease(net, LM_NET_FILENAME);
	objRelease(glbl, CORE_COMPONENT);
	objRelease(datetime, CORE_COMPONENT);
	objRelease(errmsg, CORE_COMPONENT);
ENDObjClassExit(nsd_gtls)


/* Initialize the nsd_gtls class. Must be called as the very first method
 * before anything else is called inside this class.
 * rgerhards, 2008-02-19
 */
BEGINObjClassInit(nsd_gtls, 1, OBJ_IS_LOADABLE_MODULE) /* class, version */
	/* request objects we use */
	CHKiRet(objUse(errmsg, CORE_COMPONENT));
	CHKiRet(objUse(datetime, CORE_COMPONENT));
	CHKiRet(objUse(glbl, CORE_COMPONENT));
	CHKiRet(objUse(net, LM_NET_FILENAME));
	CHKiRet(objUse(nsd_ptcp, LM_NSD_PTCP_FILENAME));

	/* now do global TLS init stuff */
	CHKiRet(gtlsGlblInit());
ENDObjClassInit(nsd_gtls)


/* --------------- here now comes the plumbing that makes as a library module --------------- */


BEGINmodExit
CODESTARTmodExit
	nsdsel_gtlsClassExit();
	nsd_gtlsClassExit();
	pthread_mutex_destroy(&mutGtlsStrerror);
ENDmodExit


BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_LIB_QUERIES
ENDqueryEtryPt


BEGINmodInit()
CODESTARTmodInit
	*ipIFVersProvided = CURR_MOD_IF_VERSION; /* we only support the current interface specification */

	/* Initialize all classes that are in our module - this includes ourselfs */
	CHKiRet(nsd_gtlsClassInit(pModInfo)); /* must be done after tcps_sess, as we use it */
	CHKiRet(nsdsel_gtlsClassInit(pModInfo)); /* must be done after tcps_sess, as we use it */

	pthread_mutex_init(&mutGtlsStrerror, NULL);
ENDmodInit
/* vi:set ai:
 */