aboutsummaryrefslogtreecommitdiff
path: root/sys/netinet/sctp_auth.c
blob: 7c2e194e1d2fd56454fbb26fb7b5b51753b13b7f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
/*-
 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * a) Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * b) 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.
 *
 * c) Neither the name of Cisco Systems, Inc. nor the names of its
 *    contributors may be 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <netinet/sctp_os.h>
#include <netinet/sctp.h>
#include <netinet/sctp_header.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctp_var.h>
#include <netinet/sctp_sysctl.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_indata.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_auth.h>

#ifdef SCTP_DEBUG
#define SCTP_AUTH_DEBUG		(SCTP_BASE_SYSCTL(sctp_debug_on) & SCTP_DEBUG_AUTH1)
#define SCTP_AUTH_DEBUG2	(SCTP_BASE_SYSCTL(sctp_debug_on) & SCTP_DEBUG_AUTH2)
#endif				/* SCTP_DEBUG */


void
sctp_clear_chunklist(sctp_auth_chklist_t * chklist)
{
	bzero(chklist, sizeof(*chklist));
	/* chklist->num_chunks = 0; */
}

sctp_auth_chklist_t *
sctp_alloc_chunklist(void)
{
	sctp_auth_chklist_t *chklist;

	SCTP_MALLOC(chklist, sctp_auth_chklist_t *, sizeof(*chklist),
	    SCTP_M_AUTH_CL);
	if (chklist == NULL) {
		SCTPDBG(SCTP_DEBUG_AUTH1, "sctp_alloc_chunklist: failed to get memory!\n");
	} else {
		sctp_clear_chunklist(chklist);
	}
	return (chklist);
}

void
sctp_free_chunklist(sctp_auth_chklist_t * list)
{
	if (list != NULL)
		SCTP_FREE(list, SCTP_M_AUTH_CL);
}

sctp_auth_chklist_t *
sctp_copy_chunklist(sctp_auth_chklist_t * list)
{
	sctp_auth_chklist_t *new_list;

	if (list == NULL)
		return (NULL);

	/* get a new list */
	new_list = sctp_alloc_chunklist();
	if (new_list == NULL)
		return (NULL);
	/* copy it */
	bcopy(list, new_list, sizeof(*new_list));

	return (new_list);
}


/*
 * add a chunk to the required chunks list
 */
int
sctp_auth_add_chunk(uint8_t chunk, sctp_auth_chklist_t * list)
{
	if (list == NULL)
		return (-1);

	/* is chunk restricted? */
	if ((chunk == SCTP_INITIATION) ||
	    (chunk == SCTP_INITIATION_ACK) ||
	    (chunk == SCTP_SHUTDOWN_COMPLETE) ||
	    (chunk == SCTP_AUTHENTICATION)) {
		return (-1);
	}
	if (list->chunks[chunk] == 0) {
		list->chunks[chunk] = 1;
		list->num_chunks++;
		SCTPDBG(SCTP_DEBUG_AUTH1,
		    "SCTP: added chunk %u (0x%02x) to Auth list\n",
		    chunk, chunk);
	}
	return (0);
}

/*
 * delete a chunk from the required chunks list
 */
int
sctp_auth_delete_chunk(uint8_t chunk, sctp_auth_chklist_t * list)
{
	if (list == NULL)
		return (-1);

	if (list->chunks[chunk] == 1) {
		list->chunks[chunk] = 0;
		list->num_chunks--;
		SCTPDBG(SCTP_DEBUG_AUTH1,
		    "SCTP: deleted chunk %u (0x%02x) from Auth list\n",
		    chunk, chunk);
	}
	return (0);
}

size_t
sctp_auth_get_chklist_size(const sctp_auth_chklist_t * list)
{
	if (list == NULL)
		return (0);
	else
		return (list->num_chunks);
}

/*
 * return the current number and list of required chunks caller must
 * guarantee ptr has space for up to 256 bytes
 */
int
sctp_serialize_auth_chunks(const sctp_auth_chklist_t * list, uint8_t * ptr)
{
	int i, count = 0;

	if (list == NULL)
		return (0);

	for (i = 0; i < 256; i++) {
		if (list->chunks[i] != 0) {
			*ptr++ = i;
			count++;
		}
	}
	return (count);
}

int
sctp_pack_auth_chunks(const sctp_auth_chklist_t * list, uint8_t * ptr)
{
	int i, size = 0;

	if (list == NULL)
		return (0);

	if (list->num_chunks <= 32) {
		/* just list them, one byte each */
		for (i = 0; i < 256; i++) {
			if (list->chunks[i] != 0) {
				*ptr++ = i;
				size++;
			}
		}
	} else {
		int index, offset;

		/* pack into a 32 byte bitfield */
		for (i = 0; i < 256; i++) {
			if (list->chunks[i] != 0) {
				index = i / 8;
				offset = i % 8;
				ptr[index] |= (1 << offset);
			}
		}
		size = 32;
	}
	return (size);
}

int
sctp_unpack_auth_chunks(const uint8_t * ptr, uint8_t num_chunks,
    sctp_auth_chklist_t * list)
{
	int i;
	int size;

	if (list == NULL)
		return (0);

	if (num_chunks <= 32) {
		/* just pull them, one byte each */
		for (i = 0; i < num_chunks; i++) {
			(void)sctp_auth_add_chunk(*ptr++, list);
		}
		size = num_chunks;
	} else {
		int index, offset;

		/* unpack from a 32 byte bitfield */
		for (index = 0; index < 32; index++) {
			for (offset = 0; offset < 8; offset++) {
				if (ptr[index] & (1 << offset)) {
					(void)sctp_auth_add_chunk((index * 8) + offset, list);
				}
			}
		}
		size = 32;
	}
	return (size);
}


/*
 * allocate structure space for a key of length keylen
 */
sctp_key_t *
sctp_alloc_key(uint32_t keylen)
{
	sctp_key_t *new_key;

	SCTP_MALLOC(new_key, sctp_key_t *, sizeof(*new_key) + keylen,
	    SCTP_M_AUTH_KY);
	if (new_key == NULL) {
		/* out of memory */
		return (NULL);
	}
	new_key->keylen = keylen;
	return (new_key);
}

void
sctp_free_key(sctp_key_t * key)
{
	if (key != NULL)
		SCTP_FREE(key, SCTP_M_AUTH_KY);
}

void
sctp_print_key(sctp_key_t * key, const char *str)
{
	uint32_t i;

	if (key == NULL) {
		SCTP_PRINTF("%s: [Null key]\n", str);
		return;
	}
	SCTP_PRINTF("%s: len %u, ", str, key->keylen);
	if (key->keylen) {
		for (i = 0; i < key->keylen; i++)
			SCTP_PRINTF("%02x", key->key[i]);
		SCTP_PRINTF("\n");
	} else {
		SCTP_PRINTF("[Null key]\n");
	}
}

void
sctp_show_key(sctp_key_t * key, const char *str)
{
	uint32_t i;

	if (key == NULL) {
		SCTP_PRINTF("%s: [Null key]\n", str);
		return;
	}
	SCTP_PRINTF("%s: len %u, ", str, key->keylen);
	if (key->keylen) {
		for (i = 0; i < key->keylen; i++)
			SCTP_PRINTF("%02x", key->key[i]);
		SCTP_PRINTF("\n");
	} else {
		SCTP_PRINTF("[Null key]\n");
	}
}

static uint32_t
sctp_get_keylen(sctp_key_t * key)
{
	if (key != NULL)
		return (key->keylen);
	else
		return (0);
}

/*
 * generate a new random key of length 'keylen'
 */
sctp_key_t *
sctp_generate_random_key(uint32_t keylen)
{
	sctp_key_t *new_key;

	new_key = sctp_alloc_key(keylen);
	if (new_key == NULL) {
		/* out of memory */
		return (NULL);
	}
	SCTP_READ_RANDOM(new_key->key, keylen);
	new_key->keylen = keylen;
	return (new_key);
}

sctp_key_t *
sctp_set_key(uint8_t * key, uint32_t keylen)
{
	sctp_key_t *new_key;

	new_key = sctp_alloc_key(keylen);
	if (new_key == NULL) {
		/* out of memory */
		return (NULL);
	}
	bcopy(key, new_key->key, keylen);
	return (new_key);
}

/*-
 * given two keys of variable size, compute which key is "larger/smaller"
 * returns:  1 if key1 > key2
 *          -1 if key1 < key2
 *           0 if key1 = key2
 */
static int
sctp_compare_key(sctp_key_t * key1, sctp_key_t * key2)
{
	uint32_t maxlen;
	uint32_t i;
	uint32_t key1len, key2len;
	uint8_t *key_1, *key_2;
	uint8_t val1, val2;

	/* sanity/length check */
	key1len = sctp_get_keylen(key1);
	key2len = sctp_get_keylen(key2);
	if ((key1len == 0) && (key2len == 0))
		return (0);
	else if (key1len == 0)
		return (-1);
	else if (key2len == 0)
		return (1);

	if (key1len < key2len) {
		maxlen = key2len;
	} else {
		maxlen = key1len;
	}
	key_1 = key1->key;
	key_2 = key2->key;
	/* check for numeric equality */
	for (i = 0; i < maxlen; i++) {
		/* left-pad with zeros */
		val1 = (i < (maxlen - key1len)) ? 0 : *(key_1++);
		val2 = (i < (maxlen - key2len)) ? 0 : *(key_2++);
		if (val1 > val2) {
			return (1);
		} else if (val1 < val2) {
			return (-1);
		}
	}
	/* keys are equal value, so check lengths */
	if (key1len == key2len)
		return (0);
	else if (key1len < key2len)
		return (-1);
	else
		return (1);
}

/*
 * generate the concatenated keying material based on the two keys and the
 * shared key (if available). draft-ietf-tsvwg-auth specifies the specific
 * order for concatenation
 */
sctp_key_t *
sctp_compute_hashkey(sctp_key_t * key1, sctp_key_t * key2, sctp_key_t * shared)
{
	uint32_t keylen;
	sctp_key_t *new_key;
	uint8_t *key_ptr;

	keylen = sctp_get_keylen(key1) + sctp_get_keylen(key2) +
	    sctp_get_keylen(shared);

	if (keylen > 0) {
		/* get space for the new key */
		new_key = sctp_alloc_key(keylen);
		if (new_key == NULL) {
			/* out of memory */
			return (NULL);
		}
		new_key->keylen = keylen;
		key_ptr = new_key->key;
	} else {
		/* all keys empty/null?! */
		return (NULL);
	}

	/* concatenate the keys */
	if (sctp_compare_key(key1, key2) <= 0) {
		/* key is shared + key1 + key2 */
		if (sctp_get_keylen(shared)) {
			bcopy(shared->key, key_ptr, shared->keylen);
			key_ptr += shared->keylen;
		}
		if (sctp_get_keylen(key1)) {
			bcopy(key1->key, key_ptr, key1->keylen);
			key_ptr += key1->keylen;
		}
		if (sctp_get_keylen(key2)) {
			bcopy(key2->key, key_ptr, key2->keylen);
		}
	} else {
		/* key is shared + key2 + key1 */
		if (sctp_get_keylen(shared)) {
			bcopy(shared->key, key_ptr, shared->keylen);
			key_ptr += shared->keylen;
		}
		if (sctp_get_keylen(key2)) {
			bcopy(key2->key, key_ptr, key2->keylen);
			key_ptr += key2->keylen;
		}
		if (sctp_get_keylen(key1)) {
			bcopy(key1->key, key_ptr, key1->keylen);
		}
	}
	return (new_key);
}


sctp_sharedkey_t *
sctp_alloc_sharedkey(void)
{
	sctp_sharedkey_t *new_key;

	SCTP_MALLOC(new_key, sctp_sharedkey_t *, sizeof(*new_key),
	    SCTP_M_AUTH_KY);
	if (new_key == NULL) {
		/* out of memory */
		return (NULL);
	}
	new_key->keyid = 0;
	new_key->key = NULL;
	new_key->refcount = 1;
	new_key->deactivated = 0;
	return (new_key);
}

void
sctp_free_sharedkey(sctp_sharedkey_t * skey)
{
	if (skey == NULL)
		return;

	if (SCTP_DECREMENT_AND_CHECK_REFCOUNT(&skey->refcount)) {
		if (skey->key != NULL)
			sctp_free_key(skey->key);
		SCTP_FREE(skey, SCTP_M_AUTH_KY);
	}
}

sctp_sharedkey_t *
sctp_find_sharedkey(struct sctp_keyhead *shared_keys, uint16_t key_id)
{
	sctp_sharedkey_t *skey;

	LIST_FOREACH(skey, shared_keys, next) {
		if (skey->keyid == key_id)
			return (skey);
	}
	return (NULL);
}

int
sctp_insert_sharedkey(struct sctp_keyhead *shared_keys,
    sctp_sharedkey_t * new_skey)
{
	sctp_sharedkey_t *skey;

	if ((shared_keys == NULL) || (new_skey == NULL))
		return (EINVAL);

	/* insert into an empty list? */
	if (LIST_EMPTY(shared_keys)) {
		LIST_INSERT_HEAD(shared_keys, new_skey, next);
		return (0);
	}
	/* insert into the existing list, ordered by key id */
	LIST_FOREACH(skey, shared_keys, next) {
		if (new_skey->keyid < skey->keyid) {
			/* insert it before here */
			LIST_INSERT_BEFORE(skey, new_skey, next);
			return (0);
		} else if (new_skey->keyid == skey->keyid) {
			/* replace the existing key */
			/* verify this key *can* be replaced */
			if ((skey->deactivated) && (skey->refcount > 1)) {
				SCTPDBG(SCTP_DEBUG_AUTH1,
				    "can't replace shared key id %u\n",
				    new_skey->keyid);
				return (EBUSY);
			}
			SCTPDBG(SCTP_DEBUG_AUTH1,
			    "replacing shared key id %u\n",
			    new_skey->keyid);
			LIST_INSERT_BEFORE(skey, new_skey, next);
			LIST_REMOVE(skey, next);
			sctp_free_sharedkey(skey);
			return (0);
		}
		if (LIST_NEXT(skey, next) == NULL) {
			/* belongs at the end of the list */
			LIST_INSERT_AFTER(skey, new_skey, next);
			return (0);
		}
	}
	/* shouldn't reach here */
	return (0);
}

void
sctp_auth_key_acquire(struct sctp_tcb *stcb, uint16_t key_id)
{
	sctp_sharedkey_t *skey;

	/* find the shared key */
	skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, key_id);

	/* bump the ref count */
	if (skey) {
		atomic_add_int(&skey->refcount, 1);
		SCTPDBG(SCTP_DEBUG_AUTH2,
		    "%s: stcb %p key %u refcount acquire to %d\n",
		    __FUNCTION__, (void *)stcb, key_id, skey->refcount);
	}
}

void
sctp_auth_key_release(struct sctp_tcb *stcb, uint16_t key_id, int so_locked
#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
    SCTP_UNUSED
#endif
)
{
	sctp_sharedkey_t *skey;

	/* find the shared key */
	skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, key_id);

	/* decrement the ref count */
	if (skey) {
		SCTPDBG(SCTP_DEBUG_AUTH2,
		    "%s: stcb %p key %u refcount release to %d\n",
		    __FUNCTION__, (void *)stcb, key_id, skey->refcount);

		/* see if a notification should be generated */
		if ((skey->refcount <= 2) && (skey->deactivated)) {
			/* notify ULP that key is no longer used */
			sctp_ulp_notify(SCTP_NOTIFY_AUTH_FREE_KEY, stcb,
			    key_id, 0, so_locked);
			SCTPDBG(SCTP_DEBUG_AUTH2,
			    "%s: stcb %p key %u no longer used, %d\n",
			    __FUNCTION__, (void *)stcb, key_id, skey->refcount);
		}
		sctp_free_sharedkey(skey);
	}
}

static sctp_sharedkey_t *
sctp_copy_sharedkey(const sctp_sharedkey_t * skey)
{
	sctp_sharedkey_t *new_skey;

	if (skey == NULL)
		return (NULL);
	new_skey = sctp_alloc_sharedkey();
	if (new_skey == NULL)
		return (NULL);
	if (skey->key != NULL)
		new_skey->key = sctp_set_key(skey->key->key, skey->key->keylen);
	else
		new_skey->key = NULL;
	new_skey->keyid = skey->keyid;
	return (new_skey);
}

int
sctp_copy_skeylist(const struct sctp_keyhead *src, struct sctp_keyhead *dest)
{
	sctp_sharedkey_t *skey, *new_skey;
	int count = 0;

	if ((src == NULL) || (dest == NULL))
		return (0);
	LIST_FOREACH(skey, src, next) {
		new_skey = sctp_copy_sharedkey(skey);
		if (new_skey != NULL) {
			(void)sctp_insert_sharedkey(dest, new_skey);
			count++;
		}
	}
	return (count);
}


sctp_hmaclist_t *
sctp_alloc_hmaclist(uint16_t num_hmacs)
{
	sctp_hmaclist_t *new_list;
	int alloc_size;

	alloc_size = sizeof(*new_list) + num_hmacs * sizeof(new_list->hmac[0]);
	SCTP_MALLOC(new_list, sctp_hmaclist_t *, alloc_size,
	    SCTP_M_AUTH_HL);
	if (new_list == NULL) {
		/* out of memory */
		return (NULL);
	}
	new_list->max_algo = num_hmacs;
	new_list->num_algo = 0;
	return (new_list);
}

void
sctp_free_hmaclist(sctp_hmaclist_t * list)
{
	if (list != NULL) {
		SCTP_FREE(list, SCTP_M_AUTH_HL);
		list = NULL;
	}
}

int
sctp_auth_add_hmacid(sctp_hmaclist_t * list, uint16_t hmac_id)
{
	int i;

	if (list == NULL)
		return (-1);
	if (list->num_algo == list->max_algo) {
		SCTPDBG(SCTP_DEBUG_AUTH1,
		    "SCTP: HMAC id list full, ignoring add %u\n", hmac_id);
		return (-1);
	}
	if ((hmac_id != SCTP_AUTH_HMAC_ID_SHA1) &&
	    (hmac_id != SCTP_AUTH_HMAC_ID_SHA256)) {
		return (-1);
	}
	/* Now is it already in the list */
	for (i = 0; i < list->num_algo; i++) {
		if (list->hmac[i] == hmac_id) {
			/* already in list */
			return (-1);
		}
	}
	SCTPDBG(SCTP_DEBUG_AUTH1, "SCTP: add HMAC id %u to list\n", hmac_id);
	list->hmac[list->num_algo++] = hmac_id;
	return (0);
}

sctp_hmaclist_t *
sctp_copy_hmaclist(sctp_hmaclist_t * list)
{
	sctp_hmaclist_t *new_list;
	int i;

	if (list == NULL)
		return (NULL);
	/* get a new list */
	new_list = sctp_alloc_hmaclist(list->max_algo);
	if (new_list == NULL)
		return (NULL);
	/* copy it */
	new_list->max_algo = list->max_algo;
	new_list->num_algo = list->num_algo;
	for (i = 0; i < list->num_algo; i++)
		new_list->hmac[i] = list->hmac[i];
	return (new_list);
}

sctp_hmaclist_t *
sctp_default_supported_hmaclist(void)
{
	sctp_hmaclist_t *new_list;

	new_list = sctp_alloc_hmaclist(2);
	if (new_list == NULL)
		return (NULL);
	/* We prefer SHA256, so list it first */
	(void)sctp_auth_add_hmacid(new_list, SCTP_AUTH_HMAC_ID_SHA256);
	(void)sctp_auth_add_hmacid(new_list, SCTP_AUTH_HMAC_ID_SHA1);
	return (new_list);
}

/*-
 * HMAC algos are listed in priority/preference order
 * find the best HMAC id to use for the peer based on local support
 */
uint16_t
sctp_negotiate_hmacid(sctp_hmaclist_t * peer, sctp_hmaclist_t * local)
{
	int i, j;

	if ((local == NULL) || (peer == NULL))
		return (SCTP_AUTH_HMAC_ID_RSVD);

	for (i = 0; i < peer->num_algo; i++) {
		for (j = 0; j < local->num_algo; j++) {
			if (peer->hmac[i] == local->hmac[j]) {
				/* found the "best" one */
				SCTPDBG(SCTP_DEBUG_AUTH1,
				    "SCTP: negotiated peer HMAC id %u\n",
				    peer->hmac[i]);
				return (peer->hmac[i]);
			}
		}
	}
	/* didn't find one! */
	return (SCTP_AUTH_HMAC_ID_RSVD);
}

/*-
 * serialize the HMAC algo list and return space used
 * caller must guarantee ptr has appropriate space
 */
int
sctp_serialize_hmaclist(sctp_hmaclist_t * list, uint8_t * ptr)
{
	int i;
	uint16_t hmac_id;

	if (list == NULL)
		return (0);

	for (i = 0; i < list->num_algo; i++) {
		hmac_id = htons(list->hmac[i]);
		bcopy(&hmac_id, ptr, sizeof(hmac_id));
		ptr += sizeof(hmac_id);
	}
	return (list->num_algo * sizeof(hmac_id));
}

int
sctp_verify_hmac_param(struct sctp_auth_hmac_algo *hmacs, uint32_t num_hmacs)
{
	uint32_t i;

	for (i = 0; i < num_hmacs; i++) {
		if (ntohs(hmacs->hmac_ids[i]) == SCTP_AUTH_HMAC_ID_SHA1) {
			return (0);
		}
	}
	return (-1);
}

sctp_authinfo_t *
sctp_alloc_authinfo(void)
{
	sctp_authinfo_t *new_authinfo;

	SCTP_MALLOC(new_authinfo, sctp_authinfo_t *, sizeof(*new_authinfo),
	    SCTP_M_AUTH_IF);

	if (new_authinfo == NULL) {
		/* out of memory */
		return (NULL);
	}
	bzero(new_authinfo, sizeof(*new_authinfo));
	return (new_authinfo);
}

void
sctp_free_authinfo(sctp_authinfo_t * authinfo)
{
	if (authinfo == NULL)
		return;

	if (authinfo->random != NULL)
		sctp_free_key(authinfo->random);
	if (authinfo->peer_random != NULL)
		sctp_free_key(authinfo->peer_random);
	if (authinfo->assoc_key != NULL)
		sctp_free_key(authinfo->assoc_key);
	if (authinfo->recv_key != NULL)
		sctp_free_key(authinfo->recv_key);

	/* We are NOT dynamically allocating authinfo's right now... */
	/* SCTP_FREE(authinfo, SCTP_M_AUTH_??); */
}


uint32_t
sctp_get_auth_chunk_len(uint16_t hmac_algo)
{
	int size;

	size = sizeof(struct sctp_auth_chunk) + sctp_get_hmac_digest_len(hmac_algo);
	return (SCTP_SIZE32(size));
}

uint32_t
sctp_get_hmac_digest_len(uint16_t hmac_algo)
{
	switch (hmac_algo) {
	case SCTP_AUTH_HMAC_ID_SHA1:
		return (SCTP_AUTH_DIGEST_LEN_SHA1);
	case SCTP_AUTH_HMAC_ID_SHA256:
		return (SCTP_AUTH_DIGEST_LEN_SHA256);
	default:
		/* unknown HMAC algorithm: can't do anything */
		return (0);
	}			/* end switch */
}

static inline int
sctp_get_hmac_block_len(uint16_t hmac_algo)
{
	switch (hmac_algo) {
	case SCTP_AUTH_HMAC_ID_SHA1:
		return (64);
	case SCTP_AUTH_HMAC_ID_SHA256:
		return (64);
	case SCTP_AUTH_HMAC_ID_RSVD:
	default:
		/* unknown HMAC algorithm: can't do anything */
		return (0);
	}			/* end switch */
}

static void
sctp_hmac_init(uint16_t hmac_algo, sctp_hash_context_t * ctx)
{
	switch (hmac_algo) {
	case SCTP_AUTH_HMAC_ID_SHA1:
		SCTP_SHA1_INIT(&ctx->sha1);
		break;
	case SCTP_AUTH_HMAC_ID_SHA256:
		SCTP_SHA256_INIT(&ctx->sha256);
		break;
	case SCTP_AUTH_HMAC_ID_RSVD:
	default:
		/* unknown HMAC algorithm: can't do anything */
		return;
	}			/* end switch */
}

static void
sctp_hmac_update(uint16_t hmac_algo, sctp_hash_context_t * ctx,
    uint8_t * text, uint32_t textlen)
{
	switch (hmac_algo) {
	case SCTP_AUTH_HMAC_ID_SHA1:
		SCTP_SHA1_UPDATE(&ctx->sha1, text, textlen);
		break;
	case SCTP_AUTH_HMAC_ID_SHA256:
		SCTP_SHA256_UPDATE(&ctx->sha256, text, textlen);
		break;
	case SCTP_AUTH_HMAC_ID_RSVD:
	default:
		/* unknown HMAC algorithm: can't do anything */
		return;
	}			/* end switch */
}

static void
sctp_hmac_final(uint16_t hmac_algo, sctp_hash_context_t * ctx,
    uint8_t * digest)
{
	switch (hmac_algo) {
	case SCTP_AUTH_HMAC_ID_SHA1:
		SCTP_SHA1_FINAL(digest, &ctx->sha1);
		break;
	case SCTP_AUTH_HMAC_ID_SHA256:
		SCTP_SHA256_FINAL(digest, &ctx->sha256);
		break;
	case SCTP_AUTH_HMAC_ID_RSVD:
	default:
		/* unknown HMAC algorithm: can't do anything */
		return;
	}			/* end switch */
}

/*-
 * Keyed-Hashing for Message Authentication: FIPS 198 (RFC 2104)
 *
 * Compute the HMAC digest using the desired hash key, text, and HMAC
 * algorithm.  Resulting digest is placed in 'digest' and digest length
 * is returned, if the HMAC was performed.
 *
 * WARNING: it is up to the caller to supply sufficient space to hold the
 * resultant digest.
 */
uint32_t
sctp_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
    uint8_t * text, uint32_t textlen, uint8_t * digest)
{
	uint32_t digestlen;
	uint32_t blocklen;
	sctp_hash_context_t ctx;
	uint8_t ipad[128], opad[128];	/* keyed hash inner/outer pads */
	uint8_t temp[SCTP_AUTH_DIGEST_LEN_MAX];
	uint32_t i;

	/* sanity check the material and length */
	if ((key == NULL) || (keylen == 0) || (text == NULL) ||
	    (textlen == 0) || (digest == NULL)) {
		/* can't do HMAC with empty key or text or digest store */
		return (0);
	}
	/* validate the hmac algo and get the digest length */
	digestlen = sctp_get_hmac_digest_len(hmac_algo);
	if (digestlen == 0)
		return (0);

	/* hash the key if it is longer than the hash block size */
	blocklen = sctp_get_hmac_block_len(hmac_algo);
	if (keylen > blocklen) {
		sctp_hmac_init(hmac_algo, &ctx);
		sctp_hmac_update(hmac_algo, &ctx, key, keylen);
		sctp_hmac_final(hmac_algo, &ctx, temp);
		/* set the hashed key as the key */
		keylen = digestlen;
		key = temp;
	}
	/* initialize the inner/outer pads with the key and "append" zeroes */
	bzero(ipad, blocklen);
	bzero(opad, blocklen);
	bcopy(key, ipad, keylen);
	bcopy(key, opad, keylen);

	/* XOR the key with ipad and opad values */
	for (i = 0; i < blocklen; i++) {
		ipad[i] ^= 0x36;
		opad[i] ^= 0x5c;
	}

	/* perform inner hash */
	sctp_hmac_init(hmac_algo, &ctx);
	sctp_hmac_update(hmac_algo, &ctx, ipad, blocklen);
	sctp_hmac_update(hmac_algo, &ctx, text, textlen);
	sctp_hmac_final(hmac_algo, &ctx, temp);

	/* perform outer hash */
	sctp_hmac_init(hmac_algo, &ctx);
	sctp_hmac_update(hmac_algo, &ctx, opad, blocklen);
	sctp_hmac_update(hmac_algo, &ctx, temp, digestlen);
	sctp_hmac_final(hmac_algo, &ctx, digest);

	return (digestlen);
}

/* mbuf version */
uint32_t
sctp_hmac_m(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
    struct mbuf *m, uint32_t m_offset, uint8_t * digest, uint32_t trailer)
{
	uint32_t digestlen;
	uint32_t blocklen;
	sctp_hash_context_t ctx;
	uint8_t ipad[128], opad[128];	/* keyed hash inner/outer pads */
	uint8_t temp[SCTP_AUTH_DIGEST_LEN_MAX];
	uint32_t i;
	struct mbuf *m_tmp;

	/* sanity check the material and length */
	if ((key == NULL) || (keylen == 0) || (m == NULL) || (digest == NULL)) {
		/* can't do HMAC with empty key or text or digest store */
		return (0);
	}
	/* validate the hmac algo and get the digest length */
	digestlen = sctp_get_hmac_digest_len(hmac_algo);
	if (digestlen == 0)
		return (0);

	/* hash the key if it is longer than the hash block size */
	blocklen = sctp_get_hmac_block_len(hmac_algo);
	if (keylen > blocklen) {
		sctp_hmac_init(hmac_algo, &ctx);
		sctp_hmac_update(hmac_algo, &ctx, key, keylen);
		sctp_hmac_final(hmac_algo, &ctx, temp);
		/* set the hashed key as the key */
		keylen = digestlen;
		key = temp;
	}
	/* initialize the inner/outer pads with the key and "append" zeroes */
	bzero(ipad, blocklen);
	bzero(opad, blocklen);
	bcopy(key, ipad, keylen);
	bcopy(key, opad, keylen);

	/* XOR the key with ipad and opad values */
	for (i = 0; i < blocklen; i++) {
		ipad[i] ^= 0x36;
		opad[i] ^= 0x5c;
	}

	/* perform inner hash */
	sctp_hmac_init(hmac_algo, &ctx);
	sctp_hmac_update(hmac_algo, &ctx, ipad, blocklen);
	/* find the correct starting mbuf and offset (get start of text) */
	m_tmp = m;
	while ((m_tmp != NULL) && (m_offset >= (uint32_t) SCTP_BUF_LEN(m_tmp))) {
		m_offset -= SCTP_BUF_LEN(m_tmp);
		m_tmp = SCTP_BUF_NEXT(m_tmp);
	}
	/* now use the rest of the mbuf chain for the text */
	while (m_tmp != NULL) {
		if ((SCTP_BUF_NEXT(m_tmp) == NULL) && trailer) {
			sctp_hmac_update(hmac_algo, &ctx, mtod(m_tmp, uint8_t *) + m_offset,
			    SCTP_BUF_LEN(m_tmp) - (trailer + m_offset));
		} else {
			sctp_hmac_update(hmac_algo, &ctx, mtod(m_tmp, uint8_t *) + m_offset,
			    SCTP_BUF_LEN(m_tmp) - m_offset);
		}

		/* clear the offset since it's only for the first mbuf */
		m_offset = 0;
		m_tmp = SCTP_BUF_NEXT(m_tmp);
	}
	sctp_hmac_final(hmac_algo, &ctx, temp);

	/* perform outer hash */
	sctp_hmac_init(hmac_algo, &ctx);
	sctp_hmac_update(hmac_algo, &ctx, opad, blocklen);
	sctp_hmac_update(hmac_algo, &ctx, temp, digestlen);
	sctp_hmac_final(hmac_algo, &ctx, digest);

	return (digestlen);
}

/*-
 * verify the HMAC digest using the desired hash key, text, and HMAC
 * algorithm.
 * Returns -1 on error, 0 on success.
 */
int
sctp_verify_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
    uint8_t * text, uint32_t textlen,
    uint8_t * digest, uint32_t digestlen)
{
	uint32_t len;
	uint8_t temp[SCTP_AUTH_DIGEST_LEN_MAX];

	/* sanity check the material and length */
	if ((key == NULL) || (keylen == 0) ||
	    (text == NULL) || (textlen == 0) || (digest == NULL)) {
		/* can't do HMAC with empty key or text or digest */
		return (-1);
	}
	len = sctp_get_hmac_digest_len(hmac_algo);
	if ((len == 0) || (digestlen != len))
		return (-1);

	/* compute the expected hash */
	if (sctp_hmac(hmac_algo, key, keylen, text, textlen, temp) != len)
		return (-1);

	if (memcmp(digest, temp, digestlen) != 0)
		return (-1);
	else
		return (0);
}


/*
 * computes the requested HMAC using a key struct (which may be modified if
 * the keylen exceeds the HMAC block len).
 */
uint32_t
sctp_compute_hmac(uint16_t hmac_algo, sctp_key_t * key, uint8_t * text,
    uint32_t textlen, uint8_t * digest)
{
	uint32_t digestlen;
	uint32_t blocklen;
	sctp_hash_context_t ctx;
	uint8_t temp[SCTP_AUTH_DIGEST_LEN_MAX];

	/* sanity check */
	if ((key == NULL) || (text == NULL) || (textlen == 0) ||
	    (digest == NULL)) {
		/* can't do HMAC with empty key or text or digest store */
		return (0);
	}
	/* validate the hmac algo and get the digest length */
	digestlen = sctp_get_hmac_digest_len(hmac_algo);
	if (digestlen == 0)
		return (0);

	/* hash the key if it is longer than the hash block size */
	blocklen = sctp_get_hmac_block_len(hmac_algo);
	if (key->keylen > blocklen) {
		sctp_hmac_init(hmac_algo, &ctx);
		sctp_hmac_update(hmac_algo, &ctx, key->key, key->keylen);
		sctp_hmac_final(hmac_algo, &ctx, temp);
		/* save the hashed key as the new key */
		key->keylen = digestlen;
		bcopy(temp, key->key, key->keylen);
	}
	return (sctp_hmac(hmac_algo, key->key, key->keylen, text, textlen,
	    digest));
}

/* mbuf version */
uint32_t
sctp_compute_hmac_m(uint16_t hmac_algo, sctp_key_t * key, struct mbuf *m,
    uint32_t m_offset, uint8_t * digest)
{
	uint32_t digestlen;
	uint32_t blocklen;
	sctp_hash_context_t ctx;
	uint8_t temp[SCTP_AUTH_DIGEST_LEN_MAX];

	/* sanity check */
	if ((key == NULL) || (m == NULL) || (digest == NULL)) {
		/* can't do HMAC with empty key or text or digest store */
		return (0);
	}
	/* validate the hmac algo and get the digest length */
	digestlen = sctp_get_hmac_digest_len(hmac_algo);
	if (digestlen == 0)
		return (0);

	/* hash the key if it is longer than the hash block size */
	blocklen = sctp_get_hmac_block_len(hmac_algo);
	if (key->keylen > blocklen) {
		sctp_hmac_init(hmac_algo, &ctx);
		sctp_hmac_update(hmac_algo, &ctx, key->key, key->keylen);
		sctp_hmac_final(hmac_algo, &ctx, temp);
		/* save the hashed key as the new key */
		key->keylen = digestlen;
		bcopy(temp, key->key, key->keylen);
	}
	return (sctp_hmac_m(hmac_algo, key->key, key->keylen, m, m_offset, digest, 0));
}

int
sctp_auth_is_supported_hmac(sctp_hmaclist_t * list, uint16_t id)
{
	int i;

	if ((list == NULL) || (id == SCTP_AUTH_HMAC_ID_RSVD))
		return (0);

	for (i = 0; i < list->num_algo; i++)
		if (list->hmac[i] == id)
			return (1);

	/* not in the list */
	return (0);
}


/*-
 * clear any cached key(s) if they match the given key id on an association.
 * the cached key(s) will be recomputed and re-cached at next use.
 * ASSUMES TCB_LOCK is already held
 */
void
sctp_clear_cachedkeys(struct sctp_tcb *stcb, uint16_t keyid)
{
	if (stcb == NULL)
		return;

	if (keyid == stcb->asoc.authinfo.assoc_keyid) {
		sctp_free_key(stcb->asoc.authinfo.assoc_key);
		stcb->asoc.authinfo.assoc_key = NULL;
	}
	if (keyid == stcb->asoc.authinfo.recv_keyid) {
		sctp_free_key(stcb->asoc.authinfo.recv_key);
		stcb->asoc.authinfo.recv_key = NULL;
	}
}

/*-
 * clear any cached key(s) if they match the given key id for all assocs on
 * an endpoint.
 * ASSUMES INP_WLOCK is already held
 */
void
sctp_clear_cachedkeys_ep(struct sctp_inpcb *inp, uint16_t keyid)
{
	struct sctp_tcb *stcb;

	if (inp == NULL)
		return;

	/* clear the cached keys on all assocs on this instance */
	LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
		SCTP_TCB_LOCK(stcb);
		sctp_clear_cachedkeys(stcb, keyid);
		SCTP_TCB_UNLOCK(stcb);
	}
}

/*-
 * delete a shared key from an association
 * ASSUMES TCB_LOCK is already held
 */
int
sctp_delete_sharedkey(struct sctp_tcb *stcb, uint16_t keyid)
{
	sctp_sharedkey_t *skey;

	if (stcb == NULL)
		return (-1);

	/* is the keyid the assoc active sending key */
	if (keyid == stcb->asoc.authinfo.active_keyid)
		return (-1);

	/* does the key exist? */
	skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, keyid);
	if (skey == NULL)
		return (-1);

	/* are there other refcount holders on the key? */
	if (skey->refcount > 1)
		return (-1);

	/* remove it */
	LIST_REMOVE(skey, next);
	sctp_free_sharedkey(skey);	/* frees skey->key as well */

	/* clear any cached keys */
	sctp_clear_cachedkeys(stcb, keyid);
	return (0);
}

/*-
 * deletes a shared key from the endpoint
 * ASSUMES INP_WLOCK is already held
 */
int
sctp_delete_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid)
{
	sctp_sharedkey_t *skey;

	if (inp == NULL)
		return (-1);

	/* is the keyid the active sending key on the endpoint */
	if (keyid == inp->sctp_ep.default_keyid)
		return (-1);

	/* does the key exist? */
	skey = sctp_find_sharedkey(&inp->sctp_ep.shared_keys, keyid);
	if (skey == NULL)
		return (-1);

	/* endpoint keys are not refcounted */

	/* remove it */
	LIST_REMOVE(skey, next);
	sctp_free_sharedkey(skey);	/* frees skey->key as well */

	/* clear any cached keys */
	sctp_clear_cachedkeys_ep(inp, keyid);
	return (0);
}

/*-
 * set the active key on an association
 * ASSUMES TCB_LOCK is already held
 */
int
sctp_auth_setactivekey(struct sctp_tcb *stcb, uint16_t keyid)
{
	sctp_sharedkey_t *skey = NULL;

	/* find the key on the assoc */
	skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, keyid);
	if (skey == NULL) {
		/* that key doesn't exist */
		return (-1);
	}
	if ((skey->deactivated) && (skey->refcount > 1)) {
		/* can't reactivate a deactivated key with other refcounts */
		return (-1);
	}
	/* set the (new) active key */
	stcb->asoc.authinfo.active_keyid = keyid;
	/* reset the deactivated flag */
	skey->deactivated = 0;

	return (0);
}

/*-
 * set the active key on an endpoint
 * ASSUMES INP_WLOCK is already held
 */
int
sctp_auth_setactivekey_ep(struct sctp_inpcb *inp, uint16_t keyid)
{
	sctp_sharedkey_t *skey;

	/* find the key */
	skey = sctp_find_sharedkey(&inp->sctp_ep.shared_keys, keyid);
	if (skey == NULL) {
		/* that key doesn't exist */
		return (-1);
	}
	inp->sctp_ep.default_keyid = keyid;
	return (0);
}

/*-
 * deactivates a shared key from the association
 * ASSUMES INP_WLOCK is already held
 */
int
sctp_deact_sharedkey(struct sctp_tcb *stcb, uint16_t keyid)
{
	sctp_sharedkey_t *skey;

	if (stcb == NULL)
		return (-1);

	/* is the keyid the assoc active sending key */
	if (keyid == stcb->asoc.authinfo.active_keyid)
		return (-1);

	/* does the key exist? */
	skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, keyid);
	if (skey == NULL)
		return (-1);

	/* are there other refcount holders on the key? */
	if (skey->refcount == 1) {
		/* no other users, send a notification for this key */
		sctp_ulp_notify(SCTP_NOTIFY_AUTH_FREE_KEY, stcb, keyid, 0,
		    SCTP_SO_LOCKED);
	}
	/* mark the key as deactivated */
	skey->deactivated = 1;

	return (0);
}

/*-
 * deactivates a shared key from the endpoint
 * ASSUMES INP_WLOCK is already held
 */
int
sctp_deact_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid)
{
	sctp_sharedkey_t *skey;

	if (inp == NULL)
		return (-1);

	/* is the keyid the active sending key on the endpoint */
	if (keyid == inp->sctp_ep.default_keyid)
		return (-1);

	/* does the key exist? */
	skey = sctp_find_sharedkey(&inp->sctp_ep.shared_keys, keyid);
	if (skey == NULL)
		return (-1);

	/* endpoint keys are not refcounted */

	/* remove it */
	LIST_REMOVE(skey, next);
	sctp_free_sharedkey(skey);	/* frees skey->key as well */

	return (0);
}

/*
 * get local authentication parameters from cookie (from INIT-ACK)
 */
void
sctp_auth_get_cookie_params(struct sctp_tcb *stcb, struct mbuf *m,
    uint32_t offset, uint32_t length)
{
	struct sctp_paramhdr *phdr, tmp_param;
	uint16_t plen, ptype;
	uint8_t random_store[SCTP_PARAM_BUFFER_SIZE];
	struct sctp_auth_random *p_random = NULL;
	uint16_t random_len = 0;
	uint8_t hmacs_store[SCTP_PARAM_BUFFER_SIZE];
	struct sctp_auth_hmac_algo *hmacs = NULL;
	uint16_t hmacs_len = 0;
	uint8_t chunks_store[SCTP_PARAM_BUFFER_SIZE];
	struct sctp_auth_chunk_list *chunks = NULL;
	uint16_t num_chunks = 0;
	sctp_key_t *new_key;
	uint32_t keylen;

	/* convert to upper bound */
	length += offset;

	phdr = (struct sctp_paramhdr *)sctp_m_getptr(m, offset,
	    sizeof(struct sctp_paramhdr), (uint8_t *) & tmp_param);
	while (phdr != NULL) {
		ptype = ntohs(phdr->param_type);
		plen = ntohs(phdr->param_length);

		if ((plen == 0) || (offset + plen > length))
			break;

		if (ptype == SCTP_RANDOM) {
			if (plen > sizeof(random_store))
				break;
			phdr = sctp_get_next_param(m, offset,
			    (struct sctp_paramhdr *)random_store, min(plen, sizeof(random_store)));
			if (phdr == NULL)
				return;
			/* save the random and length for the key */
			p_random = (struct sctp_auth_random *)phdr;
			random_len = plen - sizeof(*p_random);
		} else if (ptype == SCTP_HMAC_LIST) {
			uint16_t num_hmacs;
			uint16_t i;

			if (plen > sizeof(hmacs_store))
				break;
			phdr = sctp_get_next_param(m, offset,
			    (struct sctp_paramhdr *)hmacs_store, min(plen, sizeof(hmacs_store)));
			if (phdr == NULL)
				return;
			/* save the hmacs list and num for the key */
			hmacs = (struct sctp_auth_hmac_algo *)phdr;
			hmacs_len = plen - sizeof(*hmacs);
			num_hmacs = hmacs_len / sizeof(hmacs->hmac_ids[0]);
			if (stcb->asoc.local_hmacs != NULL)
				sctp_free_hmaclist(stcb->asoc.local_hmacs);
			stcb->asoc.local_hmacs = sctp_alloc_hmaclist(num_hmacs);
			if (stcb->asoc.local_hmacs != NULL) {
				for (i = 0; i < num_hmacs; i++) {
					(void)sctp_auth_add_hmacid(stcb->asoc.local_hmacs,
					    ntohs(hmacs->hmac_ids[i]));
				}
			}
		} else if (ptype == SCTP_CHUNK_LIST) {
			int i;

			if (plen > sizeof(chunks_store))
				break;
			phdr = sctp_get_next_param(m, offset,
			    (struct sctp_paramhdr *)chunks_store, min(plen, sizeof(chunks_store)));
			if (phdr == NULL)
				return;
			chunks = (struct sctp_auth_chunk_list *)phdr;
			num_chunks = plen - sizeof(*chunks);
			/* save chunks list and num for the key */
			if (stcb->asoc.local_auth_chunks != NULL)
				sctp_clear_chunklist(stcb->asoc.local_auth_chunks);
			else
				stcb->asoc.local_auth_chunks = sctp_alloc_chunklist();
			for (i = 0; i < num_chunks; i++) {
				(void)sctp_auth_add_chunk(chunks->chunk_types[i],
				    stcb->asoc.local_auth_chunks);
			}
		}
		/* get next parameter */
		offset += SCTP_SIZE32(plen);
		if (offset + sizeof(struct sctp_paramhdr) > length)
			break;
		phdr = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr),
		    (uint8_t *) & tmp_param);
	}
	/* concatenate the full random key */
	keylen = sizeof(*p_random) + random_len + sizeof(*hmacs) + hmacs_len;
	if (chunks != NULL) {
		keylen += sizeof(*chunks) + num_chunks;
	}
	new_key = sctp_alloc_key(keylen);
	if (new_key != NULL) {
		/* copy in the RANDOM */
		if (p_random != NULL) {
			keylen = sizeof(*p_random) + random_len;
			bcopy(p_random, new_key->key, keylen);
		}
		/* append in the AUTH chunks */
		if (chunks != NULL) {
			bcopy(chunks, new_key->key + keylen,
			    sizeof(*chunks) + num_chunks);
			keylen += sizeof(*chunks) + num_chunks;
		}
		/* append in the HMACs */
		if (hmacs != NULL) {
			bcopy(hmacs, new_key->key + keylen,
			    sizeof(*hmacs) + hmacs_len);
		}
	}
	if (stcb->asoc.authinfo.random != NULL)
		sctp_free_key(stcb->asoc.authinfo.random);
	stcb->asoc.authinfo.random = new_key;
	stcb->asoc.authinfo.random_len = random_len;
	sctp_clear_cachedkeys(stcb, stcb->asoc.authinfo.assoc_keyid);
	sctp_clear_cachedkeys(stcb, stcb->asoc.authinfo.recv_keyid);

	/* negotiate what HMAC to use for the peer */
	stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
	    stcb->asoc.local_hmacs);

	/* copy defaults from the endpoint */
	/* FIX ME: put in cookie? */
	stcb->asoc.authinfo.active_keyid = stcb->sctp_ep->sctp_ep.default_keyid;
	/* copy out the shared key list (by reference) from the endpoint */
	(void)sctp_copy_skeylist(&stcb->sctp_ep->sctp_ep.shared_keys,
	    &stcb->asoc.shared_keys);
}

/*
 * compute and fill in the HMAC digest for a packet
 */
void
sctp_fill_hmac_digest_m(struct mbuf *m, uint32_t auth_offset,
    struct sctp_auth_chunk *auth, struct sctp_tcb *stcb, uint16_t keyid)
{
	uint32_t digestlen;
	sctp_sharedkey_t *skey;
	sctp_key_t *key;

	if ((stcb == NULL) || (auth == NULL))
		return;

	/* zero the digest + chunk padding */
	digestlen = sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
	bzero(auth->hmac, SCTP_SIZE32(digestlen));

	/* is the desired key cached? */
	if ((keyid != stcb->asoc.authinfo.assoc_keyid) ||
	    (stcb->asoc.authinfo.assoc_key == NULL)) {
		if (stcb->asoc.authinfo.assoc_key != NULL) {
			/* free the old cached key */
			sctp_free_key(stcb->asoc.authinfo.assoc_key);
		}
		skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, keyid);
		/* the only way skey is NULL is if null key id 0 is used */
		if (skey != NULL)
			key = skey->key;
		else
			key = NULL;
		/* compute a new assoc key and cache it */
		stcb->asoc.authinfo.assoc_key =
		    sctp_compute_hashkey(stcb->asoc.authinfo.random,
		    stcb->asoc.authinfo.peer_random, key);
		stcb->asoc.authinfo.assoc_keyid = keyid;
		SCTPDBG(SCTP_DEBUG_AUTH1, "caching key id %u\n",
		    stcb->asoc.authinfo.assoc_keyid);
#ifdef SCTP_DEBUG
		if (SCTP_AUTH_DEBUG)
			sctp_print_key(stcb->asoc.authinfo.assoc_key,
			    "Assoc Key");
#endif
	}
	/* set in the active key id */
	auth->shared_key_id = htons(keyid);

	/* compute and fill in the digest */
	(void)sctp_compute_hmac_m(stcb->asoc.peer_hmac_id, stcb->asoc.authinfo.assoc_key,
	    m, auth_offset, auth->hmac);
}


static void
sctp_bzero_m(struct mbuf *m, uint32_t m_offset, uint32_t size)
{
	struct mbuf *m_tmp;
	uint8_t *data;

	/* sanity check */
	if (m == NULL)
		return;

	/* find the correct starting mbuf and offset (get start position) */
	m_tmp = m;
	while ((m_tmp != NULL) && (m_offset >= (uint32_t) SCTP_BUF_LEN(m_tmp))) {
		m_offset -= SCTP_BUF_LEN(m_tmp);
		m_tmp = SCTP_BUF_NEXT(m_tmp);
	}
	/* now use the rest of the mbuf chain */
	while ((m_tmp != NULL) && (size > 0)) {
		data = mtod(m_tmp, uint8_t *) + m_offset;
		if (size > (uint32_t) SCTP_BUF_LEN(m_tmp)) {
			bzero(data, SCTP_BUF_LEN(m_tmp));
			size -= SCTP_BUF_LEN(m_tmp);
		} else {
			bzero(data, size);
			size = 0;
		}
		/* clear the offset since it's only for the first mbuf */
		m_offset = 0;
		m_tmp = SCTP_BUF_NEXT(m_tmp);
	}
}

/*-
 * process the incoming Authentication chunk
 * return codes:
 *   -1 on any authentication error
 *    0 on authentication verification
 */
int
sctp_handle_auth(struct sctp_tcb *stcb, struct sctp_auth_chunk *auth,
    struct mbuf *m, uint32_t offset)
{
	uint16_t chunklen;
	uint16_t shared_key_id;
	uint16_t hmac_id;
	sctp_sharedkey_t *skey;
	uint32_t digestlen;
	uint8_t digest[SCTP_AUTH_DIGEST_LEN_MAX];
	uint8_t computed_digest[SCTP_AUTH_DIGEST_LEN_MAX];

	/* auth is checked for NULL by caller */
	chunklen = ntohs(auth->ch.chunk_length);
	if (chunklen < sizeof(*auth)) {
		SCTP_STAT_INCR(sctps_recvauthfailed);
		return (-1);
	}
	SCTP_STAT_INCR(sctps_recvauth);

	/* get the auth params */
	shared_key_id = ntohs(auth->shared_key_id);
	hmac_id = ntohs(auth->hmac_id);
	SCTPDBG(SCTP_DEBUG_AUTH1,
	    "SCTP AUTH Chunk: shared key %u, HMAC id %u\n",
	    shared_key_id, hmac_id);

	/* is the indicated HMAC supported? */
	if (!sctp_auth_is_supported_hmac(stcb->asoc.local_hmacs, hmac_id)) {
		struct mbuf *m_err;
		struct sctp_auth_invalid_hmac *err;

		SCTP_STAT_INCR(sctps_recvivalhmacid);
		SCTPDBG(SCTP_DEBUG_AUTH1,
		    "SCTP Auth: unsupported HMAC id %u\n",
		    hmac_id);
		/*
		 * report this in an Error Chunk: Unsupported HMAC
		 * Identifier
		 */
		m_err = sctp_get_mbuf_for_msg(sizeof(*err), 0, M_NOWAIT,
		    1, MT_HEADER);
		if (m_err != NULL) {
			/* pre-reserve some space */
			SCTP_BUF_RESV_UF(m_err, sizeof(struct sctp_chunkhdr));
			/* fill in the error */
			err = mtod(m_err, struct sctp_auth_invalid_hmac *);
			bzero(err, sizeof(*err));
			err->ph.param_type = htons(SCTP_CAUSE_UNSUPPORTED_HMACID);
			err->ph.param_length = htons(sizeof(*err));
			err->hmac_id = ntohs(hmac_id);
			SCTP_BUF_LEN(m_err) = sizeof(*err);
			/* queue it */
			sctp_queue_op_err(stcb, m_err);
		}
		return (-1);
	}
	/* get the indicated shared key, if available */
	if ((stcb->asoc.authinfo.recv_key == NULL) ||
	    (stcb->asoc.authinfo.recv_keyid != shared_key_id)) {
		/* find the shared key on the assoc first */
		skey = sctp_find_sharedkey(&stcb->asoc.shared_keys,
		    shared_key_id);
		/* if the shared key isn't found, discard the chunk */
		if (skey == NULL) {
			SCTP_STAT_INCR(sctps_recvivalkeyid);
			SCTPDBG(SCTP_DEBUG_AUTH1,
			    "SCTP Auth: unknown key id %u\n",
			    shared_key_id);
			return (-1);
		}
		/* generate a notification if this is a new key id */
		if (stcb->asoc.authinfo.recv_keyid != shared_key_id)
			/*
			 * sctp_ulp_notify(SCTP_NOTIFY_AUTH_NEW_KEY, stcb,
			 * shared_key_id, (void
			 * *)stcb->asoc.authinfo.recv_keyid);
			 */
			sctp_notify_authentication(stcb, SCTP_AUTH_NEW_KEY,
			    shared_key_id, stcb->asoc.authinfo.recv_keyid,
			    SCTP_SO_NOT_LOCKED);
		/* compute a new recv assoc key and cache it */
		if (stcb->asoc.authinfo.recv_key != NULL)
			sctp_free_key(stcb->asoc.authinfo.recv_key);
		stcb->asoc.authinfo.recv_key =
		    sctp_compute_hashkey(stcb->asoc.authinfo.random,
		    stcb->asoc.authinfo.peer_random, skey->key);
		stcb->asoc.authinfo.recv_keyid = shared_key_id;
#ifdef SCTP_DEBUG
		if (SCTP_AUTH_DEBUG)
			sctp_print_key(stcb->asoc.authinfo.recv_key, "Recv Key");
#endif
	}
	/* validate the digest length */
	digestlen = sctp_get_hmac_digest_len(hmac_id);
	if (chunklen < (sizeof(*auth) + digestlen)) {
		/* invalid digest length */
		SCTP_STAT_INCR(sctps_recvauthfailed);
		SCTPDBG(SCTP_DEBUG_AUTH1,
		    "SCTP Auth: chunk too short for HMAC\n");
		return (-1);
	}
	/* save a copy of the digest, zero the pseudo header, and validate */
	bcopy(auth->hmac, digest, digestlen);
	sctp_bzero_m(m, offset + sizeof(*auth), SCTP_SIZE32(digestlen));
	(void)sctp_compute_hmac_m(hmac_id, stcb->asoc.authinfo.recv_key,
	    m, offset, computed_digest);

	/* compare the computed digest with the one in the AUTH chunk */
	if (memcmp(digest, computed_digest, digestlen) != 0) {
		SCTP_STAT_INCR(sctps_recvauthfailed);
		SCTPDBG(SCTP_DEBUG_AUTH1,
		    "SCTP Auth: HMAC digest check failed\n");
		return (-1);
	}
	return (0);
}

/*
 * Generate NOTIFICATION
 */
void
sctp_notify_authentication(struct sctp_tcb *stcb, uint32_t indication,
    uint16_t keyid, uint16_t alt_keyid, int so_locked
#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
    SCTP_UNUSED
#endif
)
{
	struct mbuf *m_notify;
	struct sctp_authkey_event *auth;
	struct sctp_queued_to_read *control;

	if ((stcb == NULL) ||
	    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
	    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
	    (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)
	    ) {
		/* If the socket is gone we are out of here */
		return;
	}
	if (sctp_stcb_is_feature_off(stcb->sctp_ep, stcb, SCTP_PCB_FLAGS_AUTHEVNT))
		/* event not enabled */
		return;

	m_notify = sctp_get_mbuf_for_msg(sizeof(struct sctp_authkey_event),
	    0, M_NOWAIT, 1, MT_HEADER);
	if (m_notify == NULL)
		/* no space left */
		return;

	SCTP_BUF_LEN(m_notify) = 0;
	auth = mtod(m_notify, struct sctp_authkey_event *);
	memset(auth, 0, sizeof(struct sctp_authkey_event));
	auth->auth_type = SCTP_AUTHENTICATION_EVENT;
	auth->auth_flags = 0;
	auth->auth_length = sizeof(*auth);
	auth->auth_keynumber = keyid;
	auth->auth_altkeynumber = alt_keyid;
	auth->auth_indication = indication;
	auth->auth_assoc_id = sctp_get_associd(stcb);

	SCTP_BUF_LEN(m_notify) = sizeof(*auth);
	SCTP_BUF_NEXT(m_notify) = NULL;

	/* append to socket */
	control = sctp_build_readq_entry(stcb, stcb->asoc.primary_destination,
	    0, 0, stcb->asoc.context, 0, 0, 0, m_notify);
	if (control == NULL) {
		/* no memory */
		sctp_m_freem(m_notify);
		return;
	}
	control->spec_flags = M_NOTIFICATION;
	control->length = SCTP_BUF_LEN(m_notify);
	/* not that we need this */
	control->tail_mbuf = m_notify;
	sctp_add_to_readq(stcb->sctp_ep, stcb, control,
	    &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_NOT_HELD, so_locked);
}


/*-
 * validates the AUTHentication related parameters in an INIT/INIT-ACK
 * Note: currently only used for INIT as INIT-ACK is handled inline
 * with sctp_load_addresses_from_init()
 */
int
sctp_validate_init_auth_params(struct mbuf *m, int offset, int limit)
{
	struct sctp_paramhdr *phdr, parm_buf;
	uint16_t ptype, plen;
	int peer_supports_asconf = 0;
	int peer_supports_auth = 0;
	int got_random = 0, got_hmacs = 0, got_chklist = 0;
	uint8_t saw_asconf = 0;
	uint8_t saw_asconf_ack = 0;

	/* go through each of the params. */
	phdr = sctp_get_next_param(m, offset, &parm_buf, sizeof(parm_buf));
	while (phdr) {
		ptype = ntohs(phdr->param_type);
		plen = ntohs(phdr->param_length);

		if (offset + plen > limit) {
			break;
		}
		if (plen < sizeof(struct sctp_paramhdr)) {
			break;
		}
		if (ptype == SCTP_SUPPORTED_CHUNK_EXT) {
			/* A supported extension chunk */
			struct sctp_supported_chunk_types_param *pr_supported;
			uint8_t local_store[SCTP_PARAM_BUFFER_SIZE];
			int num_ent, i;

			phdr = sctp_get_next_param(m, offset,
			    (struct sctp_paramhdr *)&local_store, min(plen, sizeof(local_store)));
			if (phdr == NULL) {
				return (-1);
			}
			pr_supported = (struct sctp_supported_chunk_types_param *)phdr;
			num_ent = plen - sizeof(struct sctp_paramhdr);
			for (i = 0; i < num_ent; i++) {
				switch (pr_supported->chunk_types[i]) {
				case SCTP_ASCONF:
				case SCTP_ASCONF_ACK:
					peer_supports_asconf = 1;
					break;
				default:
					/* one we don't care about */
					break;
				}
			}
		} else if (ptype == SCTP_RANDOM) {
			got_random = 1;
			/* enforce the random length */
			if (plen != (sizeof(struct sctp_auth_random) +
			    SCTP_AUTH_RANDOM_SIZE_REQUIRED)) {
				SCTPDBG(SCTP_DEBUG_AUTH1,
				    "SCTP: invalid RANDOM len\n");
				return (-1);
			}
		} else if (ptype == SCTP_HMAC_LIST) {
			uint8_t store[SCTP_PARAM_BUFFER_SIZE];
			struct sctp_auth_hmac_algo *hmacs;
			int num_hmacs;

			if (plen > sizeof(store))
				break;
			phdr = sctp_get_next_param(m, offset,
			    (struct sctp_paramhdr *)store, min(plen, sizeof(store)));
			if (phdr == NULL)
				return (-1);
			hmacs = (struct sctp_auth_hmac_algo *)phdr;
			num_hmacs = (plen - sizeof(*hmacs)) /
			    sizeof(hmacs->hmac_ids[0]);
			/* validate the hmac list */
			if (sctp_verify_hmac_param(hmacs, num_hmacs)) {
				SCTPDBG(SCTP_DEBUG_AUTH1,
				    "SCTP: invalid HMAC param\n");
				return (-1);
			}
			got_hmacs = 1;
		} else if (ptype == SCTP_CHUNK_LIST) {
			int i, num_chunks;
			uint8_t chunks_store[SCTP_SMALL_CHUNK_STORE];

			/* did the peer send a non-empty chunk list? */
			struct sctp_auth_chunk_list *chunks = NULL;

			phdr = sctp_get_next_param(m, offset,
			    (struct sctp_paramhdr *)chunks_store,
			    min(plen, sizeof(chunks_store)));
			if (phdr == NULL)
				return (-1);

			/*-
			 * Flip through the list and mark that the
			 * peer supports asconf/asconf_ack.
			 */
			chunks = (struct sctp_auth_chunk_list *)phdr;
			num_chunks = plen - sizeof(*chunks);
			for (i = 0; i < num_chunks; i++) {
				/* record asconf/asconf-ack if listed */
				if (chunks->chunk_types[i] == SCTP_ASCONF)
					saw_asconf = 1;
				if (chunks->chunk_types[i] == SCTP_ASCONF_ACK)
					saw_asconf_ack = 1;

			}
			if (num_chunks)
				got_chklist = 1;
		}
		offset += SCTP_SIZE32(plen);
		if (offset >= limit) {
			break;
		}
		phdr = sctp_get_next_param(m, offset, &parm_buf,
		    sizeof(parm_buf));
	}
	/* validate authentication required parameters */
	if (got_random && got_hmacs) {
		peer_supports_auth = 1;
	} else {
		peer_supports_auth = 0;
	}
	if (!peer_supports_auth && got_chklist) {
		SCTPDBG(SCTP_DEBUG_AUTH1,
		    "SCTP: peer sent chunk list w/o AUTH\n");
		return (-1);
	}
	if (peer_supports_asconf && !peer_supports_auth) {
		SCTPDBG(SCTP_DEBUG_AUTH1,
		    "SCTP: peer supports ASCONF but not AUTH\n");
		return (-1);
	} else if ((peer_supports_asconf) && (peer_supports_auth) &&
	    ((saw_asconf == 0) || (saw_asconf_ack == 0))) {
		return (-2);
	}
	return (0);
}

void
sctp_initialize_auth_params(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
{
	uint16_t chunks_len = 0;
	uint16_t hmacs_len = 0;
	uint16_t random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
	sctp_key_t *new_key;
	uint16_t keylen;

	/* initialize hmac list from endpoint */
	stcb->asoc.local_hmacs = sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
	if (stcb->asoc.local_hmacs != NULL) {
		hmacs_len = stcb->asoc.local_hmacs->num_algo *
		    sizeof(stcb->asoc.local_hmacs->hmac[0]);
	}
	/* initialize auth chunks list from endpoint */
	stcb->asoc.local_auth_chunks =
	    sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
	if (stcb->asoc.local_auth_chunks != NULL) {
		int i;

		for (i = 0; i < 256; i++) {
			if (stcb->asoc.local_auth_chunks->chunks[i])
				chunks_len++;
		}
	}
	/* copy defaults from the endpoint */
	stcb->asoc.authinfo.active_keyid = inp->sctp_ep.default_keyid;

	/* copy out the shared key list (by reference) from the endpoint */
	(void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
	    &stcb->asoc.shared_keys);

	/* now set the concatenated key (random + chunks + hmacs) */
	/* key includes parameter headers */
	keylen = (3 * sizeof(struct sctp_paramhdr)) + random_len + chunks_len +
	    hmacs_len;
	new_key = sctp_alloc_key(keylen);
	if (new_key != NULL) {
		struct sctp_paramhdr *ph;
		int plen;

		/* generate and copy in the RANDOM */
		ph = (struct sctp_paramhdr *)new_key->key;
		ph->param_type = htons(SCTP_RANDOM);
		plen = sizeof(*ph) + random_len;
		ph->param_length = htons(plen);
		SCTP_READ_RANDOM(new_key->key + sizeof(*ph), random_len);
		keylen = plen;

		/* append in the AUTH chunks */
		/* NOTE: currently we always have chunks to list */
		ph = (struct sctp_paramhdr *)(new_key->key + keylen);
		ph->param_type = htons(SCTP_CHUNK_LIST);
		plen = sizeof(*ph) + chunks_len;
		ph->param_length = htons(plen);
		keylen += sizeof(*ph);
		if (stcb->asoc.local_auth_chunks) {
			int i;

			for (i = 0; i < 256; i++) {
				if (stcb->asoc.local_auth_chunks->chunks[i])
					new_key->key[keylen++] = i;
			}
		}
		/* append in the HMACs */
		ph = (struct sctp_paramhdr *)(new_key->key + keylen);
		ph->param_type = htons(SCTP_HMAC_LIST);
		plen = sizeof(*ph) + hmacs_len;
		ph->param_length = htons(plen);
		keylen += sizeof(*ph);
		(void)sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
		    new_key->key + keylen);
	}
	if (stcb->asoc.authinfo.random != NULL)
		sctp_free_key(stcb->asoc.authinfo.random);
	stcb->asoc.authinfo.random = new_key;
	stcb->asoc.authinfo.random_len = random_len;
}