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
|
/*
* Copyright (C) 2002-2015 Free Software Foundation, Inc.
* Copyright (C) 2014-2015 Nikos Mavrogiannopoulos
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS 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 2.1 of
* the License, or (at your option) any later version.
*
* This 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 this program. If not, see <http://www.gnu.org/licenses/>
*
*/
/* Functions to manipulate the session (gnutls_int.h), and some other stuff
* are included here. The file's name is traditionally gnutls_state even if the
* state has been renamed to session.
*/
#include "gnutls_int.h"
#include "errors.h"
#include <auth.h>
#include <num.h>
#include <datum.h>
#include <db.h>
#include <record.h>
#include <handshake.h>
#include <dh.h>
#include <buffers.h>
#include <mbuffers.h>
#include <state.h>
#include <constate.h>
#include <auth/cert.h>
#include <auth/anon.h>
#include <auth/psk.h>
#include <algorithms.h>
#include <extensions.h>
#include <system.h>
#include <random.h>
#include <fips.h>
#include <gnutls/dtls.h>
/* These should really be static, but src/tests.c calls them. Make
them public functions? */
void
_gnutls_rsa_pms_set_version(gnutls_session_t session,
unsigned char major, unsigned char minor);
void
_gnutls_session_cert_type_set(gnutls_session_t session,
gnutls_certificate_type_t ct)
{
_gnutls_handshake_log
("HSK[%p]: Selected certificate type %s (%d)\n", session,
gnutls_certificate_type_get_name(ct), ct);
session->security_parameters.cert_type = ct;
}
void
_gnutls_session_ecc_curve_set(gnutls_session_t session,
gnutls_ecc_curve_t c)
{
_gnutls_handshake_log("HSK[%p]: Selected ECC curve %s (%d)\n",
session, gnutls_ecc_curve_get_name(c), c);
session->security_parameters.ecc_curve = c;
}
/**
* gnutls_cipher_get:
* @session: is a #gnutls_session_t type.
*
* Get currently used cipher.
*
* Returns: the currently used cipher, a #gnutls_cipher_algorithm_t
* type.
**/
gnutls_cipher_algorithm_t gnutls_cipher_get(gnutls_session_t session)
{
record_parameters_st *record_params;
int ret;
ret =
_gnutls_epoch_get(session, EPOCH_READ_CURRENT, &record_params);
if (ret < 0)
return gnutls_assert_val(GNUTLS_CIPHER_NULL);
return record_params->cipher->id;
}
/**
* gnutls_certificate_type_get:
* @session: is a #gnutls_session_t type.
*
* The certificate type is by default X.509, unless it is negotiated
* as a TLS extension.
*
* Returns: the currently used #gnutls_certificate_type_t certificate
* type.
**/
gnutls_certificate_type_t
gnutls_certificate_type_get(gnutls_session_t session)
{
return session->security_parameters.cert_type;
}
/**
* gnutls_kx_get:
* @session: is a #gnutls_session_t type.
*
* Get currently used key exchange algorithm.
*
* Returns: the key exchange algorithm used in the last handshake, a
* #gnutls_kx_algorithm_t value.
**/
gnutls_kx_algorithm_t gnutls_kx_get(gnutls_session_t session)
{
return session->security_parameters.kx_algorithm;
}
/**
* gnutls_mac_get:
* @session: is a #gnutls_session_t type.
*
* Get currently used MAC algorithm.
*
* Returns: the currently used mac algorithm, a
* #gnutls_mac_algorithm_t value.
**/
gnutls_mac_algorithm_t gnutls_mac_get(gnutls_session_t session)
{
record_parameters_st *record_params;
int ret;
ret =
_gnutls_epoch_get(session, EPOCH_READ_CURRENT, &record_params);
if (ret < 0)
return gnutls_assert_val(GNUTLS_MAC_NULL);
return record_params->mac->id;
}
/**
* gnutls_compression_get:
* @session: is a #gnutls_session_t type.
*
* Get currently used compression algorithm.
*
* Returns: the currently used compression method, a
* #gnutls_compression_method_t value.
**/
gnutls_compression_method_t
gnutls_compression_get(gnutls_session_t session)
{
record_parameters_st *record_params;
int ret;
ret =
_gnutls_epoch_get(session, EPOCH_READ_CURRENT, &record_params);
if (ret < 0)
return gnutls_assert_val(GNUTLS_COMP_NULL);
return record_params->compression_algorithm;
}
/* Check if the given certificate type is supported.
* This means that it is enabled by the priority functions,
* and a matching certificate exists.
*/
int
_gnutls_session_cert_type_supported(gnutls_session_t session,
gnutls_certificate_type_t cert_type)
{
unsigned i;
unsigned cert_found = 0;
gnutls_certificate_credentials_t cred;
if (session->security_parameters.entity == GNUTLS_SERVER) {
cred = (gnutls_certificate_credentials_t)
_gnutls_get_cred(session, GNUTLS_CRD_CERTIFICATE);
if (cred == NULL)
return GNUTLS_E_UNSUPPORTED_CERTIFICATE_TYPE;
if (cred->get_cert_callback == NULL && cred->get_cert_callback2 == NULL) {
for (i = 0; i < cred->ncerts; i++) {
if (cred->certs[i].cert_list[0].type ==
cert_type) {
cert_found = 1;
break;
}
}
if (cert_found == 0)
/* no certificate is of that type.
*/
return
GNUTLS_E_UNSUPPORTED_CERTIFICATE_TYPE;
}
}
if (session->internals.priorities.cert_type.algorithms == 0
&& cert_type == DEFAULT_CERT_TYPE)
return 0;
for (i = 0; i < session->internals.priorities.cert_type.algorithms;
i++) {
if (session->internals.priorities.cert_type.priority[i] ==
cert_type) {
return 0; /* ok */
}
}
return GNUTLS_E_UNSUPPORTED_CERTIFICATE_TYPE;
}
/* this function deinitializes all the internal parameters stored
* in a session struct.
*/
inline static void deinit_internal_params(gnutls_session_t session)
{
#if defined(ENABLE_DHE) || defined(ENABLE_ANON)
if (session->internals.params.free_dh_params)
gnutls_dh_params_deinit(session->internals.params.
dh_params);
#endif
_gnutls_handshake_hash_buffers_clear(session);
memset(&session->internals.params, 0,
sizeof(session->internals.params));
}
/* This function will clear all the variables in internals
* structure within the session, which depend on the current handshake.
* This is used to allow further handshakes.
*/
static void _gnutls_handshake_internal_state_init(gnutls_session_t session)
{
session->internals.extensions_sent_size = 0;
/* by default no selected certificate */
session->internals.adv_version_major = 0;
session->internals.adv_version_minor = 0;
session->internals.direction = 0;
/* use out of band data for the last
* handshake messages received.
*/
session->internals.last_handshake_in = -1;
session->internals.last_handshake_out = -1;
session->internals.resumable = RESUME_TRUE;
session->internals.handshake_large_loops = 0;
session->internals.dtls.hsk_read_seq = 0;
session->internals.dtls.hsk_write_seq = 0;
}
void _gnutls_handshake_internal_state_clear(gnutls_session_t session)
{
_gnutls_handshake_internal_state_init(session);
deinit_internal_params(session);
_gnutls_epoch_gc(session);
session->internals.handshake_endtime = 0;
session->internals.handshake_in_progress = 0;
}
/**
* gnutls_init:
* @session: is a pointer to a #gnutls_session_t type.
* @flags: indicate if this session is to be used for server or client.
*
* This function initializes the current session to null. Every
* session must be initialized before use, so internal structures can
* be allocated. This function allocates structures which can only
* be free'd by calling gnutls_deinit(). Returns %GNUTLS_E_SUCCESS (0) on success.
*
* @flags can be one of %GNUTLS_CLIENT, %GNUTLS_SERVER, %GNUTLS_DATAGRAM,
* %GNUTLS_NONBLOCK or %GNUTLS_NOSIGNAL (since 3.4.2).
*
* The flag %GNUTLS_NO_REPLAY_PROTECTION will disable any
* replay protection in DTLS mode. That must only used when
* replay protection is achieved using other means.
*
* Note that since version 3.1.2 this function enables some common
* TLS extensions such as session tickets and OCSP certificate status
* request in client side by default. To prevent that use the %GNUTLS_NO_EXTENSIONS
* flag.
*
* Returns: %GNUTLS_E_SUCCESS on success, or an error code.
**/
int gnutls_init(gnutls_session_t * session, unsigned int flags)
{
int ret;
record_parameters_st *epoch;
FAIL_IF_LIB_ERROR;
*session = gnutls_calloc(1, sizeof(struct gnutls_session_int));
if (*session == NULL)
return GNUTLS_E_MEMORY_ERROR;
ret = _gnutls_epoch_alloc(*session, 0, &epoch);
if (ret < 0) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
/* Set all NULL algos on epoch 0 */
_gnutls_epoch_set_null_algos(*session, epoch);
(*session)->security_parameters.epoch_next = 1;
(*session)->security_parameters.entity =
(flags & GNUTLS_SERVER ? GNUTLS_SERVER : GNUTLS_CLIENT);
/* the default certificate type for TLS */
(*session)->security_parameters.cert_type = DEFAULT_CERT_TYPE;
/* Initialize buffers */
_gnutls_buffer_init(&(*session)->internals.handshake_hash_buffer);
_gnutls_buffer_init(&(*session)->internals.hb_remote_data);
_gnutls_buffer_init(&(*session)->internals.hb_local_data);
_gnutls_buffer_init(&(*session)->internals.record_presend_buffer);
_mbuffer_head_init(&(*session)->internals.record_buffer);
_mbuffer_head_init(&(*session)->internals.record_send_buffer);
_mbuffer_head_init(&(*session)->internals.record_recv_buffer);
_mbuffer_head_init(&(*session)->internals.handshake_send_buffer);
_gnutls_handshake_recv_buffer_init(*session);
(*session)->internals.expire_time = DEFAULT_EXPIRE_TIME; /* one hour default */
gnutls_handshake_set_max_packet_length((*session),
MAX_HANDSHAKE_PACKET_SIZE);
/* set the socket pointers to -1;
*/
(*session)->internals.transport_recv_ptr =
(gnutls_transport_ptr_t) - 1;
(*session)->internals.transport_send_ptr =
(gnutls_transport_ptr_t) - 1;
/* set the default maximum record size for TLS
*/
(*session)->security_parameters.max_record_recv_size =
DEFAULT_MAX_RECORD_SIZE;
(*session)->security_parameters.max_record_send_size =
DEFAULT_MAX_RECORD_SIZE;
/* everything else not initialized here is initialized
* as NULL or 0. This is why calloc is used.
*/
_gnutls_handshake_internal_state_init(*session);
/* emulate old gnutls behavior for old applications that do not use the priority_*
* functions.
*/
(*session)->internals.priorities.sr = SR_PARTIAL;
#ifdef HAVE_WRITEV
#ifdef MSG_NOSIGNAL
if (flags & GNUTLS_NO_SIGNAL)
gnutls_transport_set_vec_push_function(*session, system_writev_nosignal);
else
#endif
gnutls_transport_set_vec_push_function(*session, system_writev);
#else
gnutls_transport_set_push_function(*session, system_write);
#endif
(*session)->internals.pull_timeout_func = gnutls_system_recv_timeout;
(*session)->internals.pull_func = system_read;
(*session)->internals.errno_func = system_errno;
/* heartbeat timeouts */
(*session)->internals.hb_retrans_timeout_ms = 1000;
(*session)->internals.hb_total_timeout_ms = 60000;
if (flags & GNUTLS_DATAGRAM) {
(*session)->internals.dtls.mtu = DTLS_DEFAULT_MTU;
(*session)->internals.transport = GNUTLS_DGRAM;
gnutls_dtls_set_timeouts(*session, DTLS_RETRANS_TIMEOUT, 60000);
} else {
(*session)->internals.transport = GNUTLS_STREAM;
}
if (flags & GNUTLS_NONBLOCK)
(*session)->internals.blocking = 0;
else
(*session)->internals.blocking = 1;
/* Enable useful extensions */
if ((flags & GNUTLS_CLIENT) && !(flags & GNUTLS_NO_EXTENSIONS)) {
#ifdef ENABLE_SESSION_TICKETS
gnutls_session_ticket_enable_client(*session);
#endif
#ifdef ENABLE_OCSP
gnutls_ocsp_status_request_enable_client(*session, NULL, 0,
NULL);
#endif
}
if (!(flags & GNUTLS_NO_EXTENSIONS))
(*session)->internals.try_ext_master_secret = 1;
if (flags & GNUTLS_NO_REPLAY_PROTECTION)
(*session)->internals.no_replay_protection = 1;
return 0;
}
/* returns RESUME_FALSE or RESUME_TRUE.
*/
int _gnutls_session_is_resumable(gnutls_session_t session)
{
return session->internals.resumable;
}
/**
* gnutls_deinit:
* @session: is a #gnutls_session_t type.
*
* This function clears all buffers associated with the @session.
* This function will also remove session data from the session
* database if the session was terminated abnormally.
**/
void gnutls_deinit(gnutls_session_t session)
{
unsigned int i;
if (session == NULL)
return;
/* remove auth info firstly */
_gnutls_free_auth_info(session);
_gnutls_handshake_internal_state_clear(session);
_gnutls_handshake_io_buffer_clear(session);
_gnutls_ext_free_session_data(session);
for (i = 0; i < MAX_EPOCH_INDEX; i++)
if (session->record_parameters[i] != NULL) {
_gnutls_epoch_free(session,
session->record_parameters[i]);
session->record_parameters[i] = NULL;
}
_gnutls_buffer_clear(&session->internals.handshake_hash_buffer);
_gnutls_buffer_clear(&session->internals.hb_remote_data);
_gnutls_buffer_clear(&session->internals.hb_local_data);
_gnutls_buffer_clear(&session->internals.record_presend_buffer);
_mbuffer_head_clear(&session->internals.record_buffer);
_mbuffer_head_clear(&session->internals.record_recv_buffer);
_mbuffer_head_clear(&session->internals.record_send_buffer);
gnutls_credentials_clear(session);
_gnutls_selected_certs_deinit(session);
gnutls_pk_params_release(&session->key.ecdh_params);
gnutls_pk_params_release(&session->key.dh_params);
zrelease_temp_mpi_key(&session->key.ecdh_x);
zrelease_temp_mpi_key(&session->key.ecdh_y);
zrelease_temp_mpi_key(&session->key.client_Y);
zrelease_temp_mpi_key(&session->key.srp_p);
zrelease_temp_mpi_key(&session->key.srp_g);
zrelease_temp_mpi_key(&session->key.srp_key);
zrelease_temp_mpi_key(&session->key.u);
zrelease_temp_mpi_key(&session->key.a);
zrelease_temp_mpi_key(&session->key.x);
zrelease_temp_mpi_key(&session->key.A);
zrelease_temp_mpi_key(&session->key.B);
zrelease_temp_mpi_key(&session->key.b);
/* RSA */
zrelease_temp_mpi_key(&session->key.rsa[0]);
zrelease_temp_mpi_key(&session->key.rsa[1]);
_gnutls_free_temp_key_datum(&session->key.key);
gnutls_free(session);
}
/* Returns the minimum prime bits that are acceptable.
*/
int _gnutls_dh_set_peer_public(gnutls_session_t session, bigint_t public)
{
dh_info_st *dh;
int ret;
switch (gnutls_auth_get_type(session)) {
case GNUTLS_CRD_ANON:
{
anon_auth_info_t info;
info = _gnutls_get_auth_info(session, GNUTLS_CRD_ANON);
if (info == NULL)
return GNUTLS_E_INTERNAL_ERROR;
dh = &info->dh;
break;
}
case GNUTLS_CRD_PSK:
{
psk_auth_info_t info;
info = _gnutls_get_auth_info(session, GNUTLS_CRD_PSK);
if (info == NULL)
return GNUTLS_E_INTERNAL_ERROR;
dh = &info->dh;
break;
}
case GNUTLS_CRD_CERTIFICATE:
{
cert_auth_info_t info;
info = _gnutls_get_auth_info(session, GNUTLS_CRD_CERTIFICATE);
if (info == NULL)
return GNUTLS_E_INTERNAL_ERROR;
dh = &info->dh;
break;
}
default:
gnutls_assert();
return GNUTLS_E_INTERNAL_ERROR;
}
if (dh->public_key.data)
_gnutls_free_datum(&dh->public_key);
ret = _gnutls_mpi_dprint_lz(public, &dh->public_key);
if (ret < 0) {
gnutls_assert();
return ret;
}
return 0;
}
int _gnutls_dh_set_secret_bits(gnutls_session_t session, unsigned bits)
{
switch (gnutls_auth_get_type(session)) {
case GNUTLS_CRD_ANON:
{
anon_auth_info_t info;
info = _gnutls_get_auth_info(session, GNUTLS_CRD_ANON);
if (info == NULL)
return GNUTLS_E_INTERNAL_ERROR;
info->dh.secret_bits = bits;
break;
}
case GNUTLS_CRD_PSK:
{
psk_auth_info_t info;
info = _gnutls_get_auth_info(session, GNUTLS_CRD_PSK);
if (info == NULL)
return GNUTLS_E_INTERNAL_ERROR;
info->dh.secret_bits = bits;
break;
}
case GNUTLS_CRD_CERTIFICATE:
{
cert_auth_info_t info;
info = _gnutls_get_auth_info(session, GNUTLS_CRD_CERTIFICATE);
if (info == NULL)
return GNUTLS_E_INTERNAL_ERROR;
info->dh.secret_bits = bits;
break;
default:
gnutls_assert();
return GNUTLS_E_INTERNAL_ERROR;
}
}
return 0;
}
/* Sets the prime and the generator in the auth info structure.
*/
int
_gnutls_dh_set_group(gnutls_session_t session, bigint_t gen,
bigint_t prime)
{
dh_info_st *dh;
int ret;
switch (gnutls_auth_get_type(session)) {
case GNUTLS_CRD_ANON:
{
anon_auth_info_t info;
info = _gnutls_get_auth_info(session, GNUTLS_CRD_ANON);
if (info == NULL)
return GNUTLS_E_INTERNAL_ERROR;
dh = &info->dh;
break;
}
case GNUTLS_CRD_PSK:
{
psk_auth_info_t info;
info = _gnutls_get_auth_info(session, GNUTLS_CRD_PSK);
if (info == NULL)
return GNUTLS_E_INTERNAL_ERROR;
dh = &info->dh;
break;
}
case GNUTLS_CRD_CERTIFICATE:
{
cert_auth_info_t info;
info = _gnutls_get_auth_info(session, GNUTLS_CRD_CERTIFICATE);
if (info == NULL)
return GNUTLS_E_INTERNAL_ERROR;
dh = &info->dh;
break;
}
default:
gnutls_assert();
return GNUTLS_E_INTERNAL_ERROR;
}
if (dh->prime.data)
_gnutls_free_datum(&dh->prime);
if (dh->generator.data)
_gnutls_free_datum(&dh->generator);
/* prime
*/
ret = _gnutls_mpi_dprint_lz(prime, &dh->prime);
if (ret < 0) {
gnutls_assert();
return ret;
}
/* generator
*/
ret = _gnutls_mpi_dprint_lz(gen, &dh->generator);
if (ret < 0) {
gnutls_assert();
_gnutls_free_datum(&dh->prime);
return ret;
}
return 0;
}
#ifdef ENABLE_OPENPGP
/**
* gnutls_openpgp_send_cert:
* @session: a #gnutls_session_t type.
* @status: is one of GNUTLS_OPENPGP_CERT, or GNUTLS_OPENPGP_CERT_FINGERPRINT
*
* This function will order gnutls to send the key fingerprint
* instead of the key in the initial handshake procedure. This should
* be used with care and only when there is indication or knowledge
* that the server can obtain the client's key.
**/
void
gnutls_openpgp_send_cert(gnutls_session_t session,
gnutls_openpgp_crt_status_t status)
{
session->internals.pgp_fingerprint = status;
}
#endif
/**
* gnutls_certificate_send_x509_rdn_sequence:
* @session: a #gnutls_session_t type.
* @status: is 0 or 1
*
* If status is non zero, this function will order gnutls not to send
* the rdnSequence in the certificate request message. That is the
* server will not advertise its trusted CAs to the peer. If status
* is zero then the default behaviour will take effect, which is to
* advertise the server's trusted CAs.
*
* This function has no effect in clients, and in authentication
* methods other than certificate with X.509 certificates.
**/
void
gnutls_certificate_send_x509_rdn_sequence(gnutls_session_t session,
int status)
{
session->internals.ignore_rdn_sequence = status;
}
#ifdef ENABLE_OPENPGP
int _gnutls_openpgp_send_fingerprint(gnutls_session_t session)
{
return session->internals.pgp_fingerprint;
}
#endif
/*-
* _gnutls_record_set_default_version - Used to set the default version for the first record packet
* @session: is a #gnutls_session_t type.
* @major: is a tls major version
* @minor: is a tls minor version
*
* This function sets the default version that we will use in the first
* record packet (client hello). This function is only useful to people
* that know TLS internals and want to debug other implementations.
-*/
void
_gnutls_record_set_default_version(gnutls_session_t session,
unsigned char major,
unsigned char minor)
{
session->internals.default_record_version[0] = major;
session->internals.default_record_version[1] = minor;
}
/*-
* _gnutls_hello_set_default_version - Used to set the default version for the first record packet
* @session: is a #gnutls_session_t type.
* @major: is a tls major version
* @minor: is a tls minor version
*
* This function sets the default version that we will use in the first
* record packet (client hello). This function is only useful to people
* that know TLS internals and want to debug other implementations.
-*/
void
_gnutls_hello_set_default_version(gnutls_session_t session,
unsigned char major,
unsigned char minor)
{
session->internals.default_hello_version[0] = major;
session->internals.default_hello_version[1] = minor;
}
/**
* gnutls_handshake_set_private_extensions:
* @session: is a #gnutls_session_t type.
* @allow: is an integer (0 or 1)
*
* This function will enable or disable the use of private cipher
* suites (the ones that start with 0xFF). By default or if @allow
* is 0 then these cipher suites will not be advertised nor used.
*
* Currently GnuTLS does not include such cipher-suites or
* compression algorithms.
*
* Enabling the private ciphersuites when talking to other than
* gnutls servers and clients may cause interoperability problems.
**/
void
gnutls_handshake_set_private_extensions(gnutls_session_t session,
int allow)
{
session->internals.enable_private = allow;
}
/**
* gnutls_session_is_resumed:
* @session: is a #gnutls_session_t type.
*
* Check whether session is resumed or not.
*
* Returns: non zero if this session is resumed, or a zero if this is
* a new session.
**/
int gnutls_session_is_resumed(gnutls_session_t session)
{
if (session->security_parameters.entity == GNUTLS_CLIENT) {
if (session->security_parameters.session_id_size > 0 &&
session->security_parameters.session_id_size ==
session->internals.resumed_security_parameters.
session_id_size
&& memcmp(session->security_parameters.session_id,
session->
internals.resumed_security_parameters.
session_id,
session->security_parameters.
session_id_size) == 0)
return 1;
} else {
if (session->internals.resumed != RESUME_FALSE)
return 1;
}
return 0;
}
/**
* gnutls_session_resumption_requested:
* @session: is a #gnutls_session_t type.
*
* Check whether the client has asked for session resumption.
* This function is valid only on server side.
*
* Returns: non zero if session resumption was asked, or a zero if not.
**/
int gnutls_session_resumption_requested(gnutls_session_t session)
{
if (session->security_parameters.entity == GNUTLS_CLIENT) {
return 0;
} else {
return session->internals.resumption_requested;
}
}
/*-
* _gnutls_session_is_psk - Used to check whether this session uses PSK kx
* @session: is a #gnutls_session_t type.
*
* This function will return non zero if this session uses a PSK key
* exchange algorithm.
-*/
int _gnutls_session_is_psk(gnutls_session_t session)
{
gnutls_kx_algorithm_t kx;
kx = _gnutls_cipher_suite_get_kx_algo(session->security_parameters.
cipher_suite);
if (kx == GNUTLS_KX_PSK || kx == GNUTLS_KX_DHE_PSK
|| kx == GNUTLS_KX_RSA_PSK)
return 1;
return 0;
}
/*-
* _gnutls_session_is_ecc - Used to check whether this session uses ECC kx
* @session: is a #gnutls_session_t type.
*
* This function will return non zero if this session uses an elliptic
* curves key exchange exchange algorithm.
-*/
int _gnutls_session_is_ecc(gnutls_session_t session)
{
gnutls_kx_algorithm_t kx;
/* We get the key exchange algorithm through the ciphersuite because
* the negotiated key exchange might not have been set yet.
*/
kx = _gnutls_cipher_suite_get_kx_algo(session->security_parameters.
cipher_suite);
return _gnutls_kx_is_ecc(kx);
}
/**
* gnutls_session_get_ptr:
* @session: is a #gnutls_session_t type.
*
* Get user pointer for session. Useful in callbacks. This is the
* pointer set with gnutls_session_set_ptr().
*
* Returns: the user given pointer from the session structure, or
* %NULL if it was never set.
**/
void *gnutls_session_get_ptr(gnutls_session_t session)
{
return session->internals.user_ptr;
}
/**
* gnutls_session_set_ptr:
* @session: is a #gnutls_session_t type.
* @ptr: is the user pointer
*
* This function will set (associate) the user given pointer @ptr to
* the session structure. This pointer can be accessed with
* gnutls_session_get_ptr().
**/
void gnutls_session_set_ptr(gnutls_session_t session, void *ptr)
{
session->internals.user_ptr = ptr;
}
/**
* gnutls_session_set_verify_function:
* @session: is a #gnutls_session_t type.
* @func: is the callback function
*
* This function sets a callback to be called when peer's certificate
* has been received in order to verify it on receipt rather than
* doing after the handshake is completed. This overrides any callback
* set using gnutls_certificate_set_verify_function().
*
* The callback's function prototype is:
* int (*callback)(gnutls_session_t);
*
* If the callback function is provided then gnutls will call it, in the
* handshake, just after the certificate message has been received.
* To verify or obtain the certificate the gnutls_certificate_verify_peers2(),
* gnutls_certificate_type_get(), gnutls_certificate_get_peers() functions
* can be used.
*
* The callback function should return 0 for the handshake to continue
* or non-zero to terminate.
*
* Since: 3.4.6
**/
void
gnutls_session_set_verify_function
(gnutls_session_t session,
gnutls_certificate_verify_function * func)
{
session->internals.verify_callback = func;
}
/**
* gnutls_record_get_direction:
* @session: is a #gnutls_session_t type.
*
* This function provides information about the internals of the
* record protocol and is only useful if a prior gnutls function call
* (e.g. gnutls_handshake()) was interrupted for some reason, that
* is, if a function returned %GNUTLS_E_INTERRUPTED or
* %GNUTLS_E_AGAIN. In such a case, you might want to call select()
* or poll() before calling the interrupted gnutls function again. To
* tell you whether a file descriptor should be selected for either
* reading or writing, gnutls_record_get_direction() returns 0 if the
* interrupted function was trying to read data, and 1 if it was
* trying to write data.
*
* This function's output is unreliable if you are using the
* @session in different threads, for sending and receiving.
*
* Returns: 0 if trying to read data, 1 if trying to write data.
**/
int gnutls_record_get_direction(gnutls_session_t session)
{
return session->internals.direction;
}
/*-
* _gnutls_rsa_pms_set_version - Sets a version to be used at the RSA PMS
* @session: is a #gnutls_session_t type.
* @major: is the major version to use
* @minor: is the minor version to use
*
* This function will set the given version number to be used at the
* RSA PMS secret. This is only useful to clients, which want to
* test server's capabilities.
-*/
void
_gnutls_rsa_pms_set_version(gnutls_session_t session,
unsigned char major, unsigned char minor)
{
session->internals.rsa_pms_version[0] = major;
session->internals.rsa_pms_version[1] = minor;
}
/**
* gnutls_handshake_set_post_client_hello_function:
* @session: is a #gnutls_session_t type.
* @func: is the function to be called
*
* This function will set a callback to be called after the client
* hello has been received (callback valid in server side only). This
* allows the server to adjust settings based on received extensions.
*
* Those settings could be ciphersuites, requesting certificate, or
* anything else except for version negotiation (this is done before
* the hello message is parsed).
*
* This callback must return 0 on success or a gnutls error code to
* terminate the handshake.
*
* Since GnuTLS 3.3.5 the callback is
* allowed to return %GNUTLS_E_AGAIN or %GNUTLS_E_INTERRUPTED to
* put the handshake on hold. In that case gnutls_handshake()
* will return %GNUTLS_E_INTERRUPTED and can be resumed when needed.
*
* Warning: You should not use this function to terminate the
* handshake based on client input unless you know what you are
* doing. Before the handshake is finished there is no way to know if
* there is a man-in-the-middle attack being performed.
**/
void
gnutls_handshake_set_post_client_hello_function(gnutls_session_t session,
gnutls_handshake_post_client_hello_func
func)
{
session->internals.user_hello_func = func;
}
/**
* gnutls_session_enable_compatibility_mode:
* @session: is a #gnutls_session_t type.
*
* This function can be used to disable certain (security) features in
* TLS in order to maintain maximum compatibility with buggy
* clients. Because several trade-offs with security are enabled,
* if required they will be reported through the audit subsystem.
*
* Normally only servers that require maximum compatibility with
* everything out there, need to call this function.
*
* Note that this function must be called after any call to gnutls_priority
* functions.
**/
void gnutls_session_enable_compatibility_mode(gnutls_session_t session)
{
ENABLE_COMPAT(&session->internals.priorities);
}
/**
* gnutls_session_channel_binding:
* @session: is a #gnutls_session_t type.
* @cbtype: an #gnutls_channel_binding_t enumeration type
* @cb: output buffer array with data
*
* Extract given channel binding data of the @cbtype (e.g.,
* %GNUTLS_CB_TLS_UNIQUE) type.
*
* Returns: %GNUTLS_E_SUCCESS on success,
* %GNUTLS_E_UNIMPLEMENTED_FEATURE if the @cbtype is unsupported,
* %GNUTLS_E_CHANNEL_BINDING_NOT_AVAILABLE if the data is not
* currently available, or an error code.
*
* Since: 2.12.0
**/
int
gnutls_session_channel_binding(gnutls_session_t session,
gnutls_channel_binding_t cbtype,
gnutls_datum_t * cb)
{
if (cbtype != GNUTLS_CB_TLS_UNIQUE)
return GNUTLS_E_UNIMPLEMENTED_FEATURE;
if (!session->internals.initial_negotiation_completed)
return GNUTLS_E_CHANNEL_BINDING_NOT_AVAILABLE;
cb->size = session->internals.cb_tls_unique_len;
cb->data = gnutls_malloc(cb->size);
if (cb->data == NULL)
return GNUTLS_E_MEMORY_ERROR;
memcpy(cb->data, session->internals.cb_tls_unique, cb->size);
return 0;
}
/**
* gnutls_ecc_curve_get:
* @session: is a #gnutls_session_t type.
*
* Returns the currently used elliptic curve. Only valid
* when using an elliptic curve ciphersuite.
*
* Returns: the currently used curve, a #gnutls_ecc_curve_t
* type.
*
* Since: 3.0
**/
gnutls_ecc_curve_t gnutls_ecc_curve_get(gnutls_session_t session)
{
return _gnutls_session_ecc_curve_get(session);
}
/**
* gnutls_protocol_get_version:
* @session: is a #gnutls_session_t type.
*
* Get TLS version, a #gnutls_protocol_t value.
*
* Returns: The version of the currently used protocol.
**/
gnutls_protocol_t gnutls_protocol_get_version(gnutls_session_t session)
{
return get_num_version(session);
}
/**
* gnutls_session_get_random:
* @session: is a #gnutls_session_t type.
* @client: the client part of the random
* @server: the server part of the random
*
* This function returns pointers to the client and server
* random fields used in the TLS handshake. The pointers are
* not to be modified or deallocated.
*
* If a client random value has not yet been established, the output
* will be garbage.
*
* Since: 3.0
**/
void
gnutls_session_get_random(gnutls_session_t session,
gnutls_datum_t * client, gnutls_datum_t * server)
{
if (client) {
client->data = session->security_parameters.client_random;
client->size =
sizeof(session->security_parameters.client_random);
}
if (server) {
server->data = session->security_parameters.server_random;
server->size =
sizeof(session->security_parameters.server_random);
}
}
unsigned int timespec_sub_ms(struct timespec *a, struct timespec *b)
{
return (a->tv_sec * 1000 + a->tv_nsec / (1000 * 1000) -
(b->tv_sec * 1000 + b->tv_nsec / (1000 * 1000)));
}
/**
* gnutls_handshake_set_random:
* @session: is a #gnutls_session_t type.
* @random: a random value of 32-bytes
*
* This function will explicitly set the server or client hello
* random value in the subsequent TLS handshake. The random value
* should be a 32-byte value.
*
* Note that this function should not normally be used as gnutls
* will select automatically a random value for the handshake.
*
* This function should not be used when resuming a session.
*
* Returns: %GNUTLS_E_SUCCESS on success, or an error code.
*
* Since 3.1.9
**/
int
gnutls_handshake_set_random(gnutls_session_t session,
const gnutls_datum_t * random)
{
if (random->size != GNUTLS_RANDOM_SIZE)
return GNUTLS_E_INVALID_REQUEST;
session->internals.sc_random_set = 1;
if (session->security_parameters.entity == GNUTLS_CLIENT)
memcpy(session->internals.resumed_security_parameters.
client_random, random->data, random->size);
else
memcpy(session->internals.resumed_security_parameters.
server_random, random->data, random->size);
return 0;
}
/**
* gnutls_handshake_set_hook_function:
* @session: is a #gnutls_session_t type
* @htype: the %gnutls_handshake_description_t of the message to hook at
* @post: %GNUTLS_HOOK_* depending on when the hook function should be called
* @func: is the function to be called
*
* This function will set a callback to be called after or before the specified
* handshake message has been received or generated. This is a
* generalization of gnutls_handshake_set_post_client_hello_function().
*
* To call the hook function prior to the message being sent/generated use
* %GNUTLS_HOOK_PRE as @post parameter, %GNUTLS_HOOK_POST to call
* after, and %GNUTLS_HOOK_BOTH for both cases.
*
* This callback must return 0 on success or a gnutls error code to
* terminate the handshake.
*
* Note to hook at all handshake messages use an @htype of %GNUTLS_HANDSHAKE_ANY.
*
* Warning: You should not use this function to terminate the
* handshake based on client input unless you know what you are
* doing. Before the handshake is finished there is no way to know if
* there is a man-in-the-middle attack being performed.
**/
void
gnutls_handshake_set_hook_function(gnutls_session_t session,
unsigned int htype,
int post,
gnutls_handshake_hook_func func)
{
session->internals.h_hook = func;
session->internals.h_type = htype;
session->internals.h_post = post;
}
/**
* gnutls_record_get_state:
* @session: is a #gnutls_session_t type
* @read: if non-zero the read parameters are returned, otherwise the write
* @mac_key: the key used for MAC (if a MAC is used)
* @IV: the initialization vector or nonce used
* @cipher_key: the cipher key
* @seq_number: A 64-bit sequence number
*
* This function will return the parameters of the current record state.
* These are only useful to be provided to an external off-loading device
* or subsystem.
*
* In that case, to sync the state you must call gnutls_record_set_state().
*
* Returns: %GNUTLS_E_SUCCESS on success, or an error code.
*
* Since 3.4.0
**/
int
gnutls_record_get_state(gnutls_session_t session,
unsigned read,
gnutls_datum_t *mac_key,
gnutls_datum_t *IV,
gnutls_datum_t *cipher_key,
unsigned char seq_number[8])
{
record_parameters_st *record_params;
record_state_st *record_state;
unsigned int epoch;
int ret;
if (read)
epoch = EPOCH_READ_CURRENT;
else
epoch = EPOCH_WRITE_CURRENT;
ret = _gnutls_epoch_get(session, epoch, &record_params);
if (ret < 0)
return gnutls_assert_val(ret);
if (!record_params->initialized)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
if (read)
record_state = &record_params->read;
else
record_state = &record_params->write;
memcpy(mac_key, &record_state->mac_secret, sizeof(gnutls_datum_t));
memcpy(IV, &record_state->IV, sizeof(gnutls_datum_t));
memcpy(cipher_key, &record_state->key, sizeof(gnutls_datum_t));
memcpy(seq_number, UINT64DATA(record_state->sequence_number), 8);
return 0;
}
/**
* gnutls_record_set_state:
* @session: is a #gnutls_session_t type
* @read: if non-zero the read parameters are returned, otherwise the write
* @seq_number: A 64-bit sequence number
*
* This function will set the sequence number in the current record state.
* This function is useful if sending and receiving are offloaded from
* gnutls. That is, if gnutls_record_get_state() was used.
*
* Returns: %GNUTLS_E_SUCCESS on success, or an error code.
*
* Since 3.4.0
**/
int
gnutls_record_set_state(gnutls_session_t session,
unsigned read,
unsigned char seq_number[8])
{
record_parameters_st *record_params;
record_state_st *record_state;
int epoch, ret;
if (read)
epoch = EPOCH_READ_CURRENT;
else
epoch = EPOCH_WRITE_CURRENT;
ret = _gnutls_epoch_get(session, epoch, &record_params);
if (ret < 0)
return gnutls_assert_val(ret);
if (!record_params->initialized)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
if (read)
record_state = &record_params->read;
else
record_state = &record_params->write;
memcpy(UINT64DATA(record_state->sequence_number), seq_number, 8);
return 0;
}
|