aboutsummaryrefslogtreecommitdiff
path: root/apps/s_cb.c
blob: dee1b2e5b4f65e06664f31954648d21c22a2a64a (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
/*
 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

/* callback functions used by s_client, s_server, and s_time */
#include <stdio.h>
#include <stdlib.h>
#include <string.h> /* for memcpy() and strcmp() */
#include "apps.h"
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/x509.h>
#include <openssl/ssl.h>
#include <openssl/bn.h>
#ifndef OPENSSL_NO_DH
# include <openssl/dh.h>
#endif
#include "s_apps.h"

#define COOKIE_SECRET_LENGTH    16

VERIFY_CB_ARGS verify_args = { -1, 0, X509_V_OK, 0 };

#ifndef OPENSSL_NO_SOCK
static unsigned char cookie_secret[COOKIE_SECRET_LENGTH];
static int cookie_initialized = 0;
#endif
static BIO *bio_keylog = NULL;

static const char *lookup(int val, const STRINT_PAIR* list, const char* def)
{
    for ( ; list->name; ++list)
        if (list->retval == val)
            return list->name;
    return def;
}

int verify_callback(int ok, X509_STORE_CTX *ctx)
{
    X509 *err_cert;
    int err, depth;

    err_cert = X509_STORE_CTX_get_current_cert(ctx);
    err = X509_STORE_CTX_get_error(ctx);
    depth = X509_STORE_CTX_get_error_depth(ctx);

    if (!verify_args.quiet || !ok) {
        BIO_printf(bio_err, "depth=%d ", depth);
        if (err_cert != NULL) {
            X509_NAME_print_ex(bio_err,
                               X509_get_subject_name(err_cert),
                               0, get_nameopt());
            BIO_puts(bio_err, "\n");
        } else {
            BIO_puts(bio_err, "<no cert>\n");
        }
    }
    if (!ok) {
        BIO_printf(bio_err, "verify error:num=%d:%s\n", err,
                   X509_verify_cert_error_string(err));
        if (verify_args.depth < 0 || verify_args.depth >= depth) {
            if (!verify_args.return_error)
                ok = 1;
            verify_args.error = err;
        } else {
            ok = 0;
            verify_args.error = X509_V_ERR_CERT_CHAIN_TOO_LONG;
        }
    }
    switch (err) {
    case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
        BIO_puts(bio_err, "issuer= ");
        X509_NAME_print_ex(bio_err, X509_get_issuer_name(err_cert),
                           0, get_nameopt());
        BIO_puts(bio_err, "\n");
        break;
    case X509_V_ERR_CERT_NOT_YET_VALID:
    case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
        BIO_printf(bio_err, "notBefore=");
        ASN1_TIME_print(bio_err, X509_get0_notBefore(err_cert));
        BIO_printf(bio_err, "\n");
        break;
    case X509_V_ERR_CERT_HAS_EXPIRED:
    case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
        BIO_printf(bio_err, "notAfter=");
        ASN1_TIME_print(bio_err, X509_get0_notAfter(err_cert));
        BIO_printf(bio_err, "\n");
        break;
    case X509_V_ERR_NO_EXPLICIT_POLICY:
        if (!verify_args.quiet)
            policies_print(ctx);
        break;
    }
    if (err == X509_V_OK && ok == 2 && !verify_args.quiet)
        policies_print(ctx);
    if (ok && !verify_args.quiet)
        BIO_printf(bio_err, "verify return:%d\n", ok);
    return ok;
}

int set_cert_stuff(SSL_CTX *ctx, char *cert_file, char *key_file)
{
    if (cert_file != NULL) {
        if (SSL_CTX_use_certificate_file(ctx, cert_file,
                                         SSL_FILETYPE_PEM) <= 0) {
            BIO_printf(bio_err, "unable to get certificate from '%s'\n",
                       cert_file);
            ERR_print_errors(bio_err);
            return 0;
        }
        if (key_file == NULL)
            key_file = cert_file;
        if (SSL_CTX_use_PrivateKey_file(ctx, key_file, SSL_FILETYPE_PEM) <= 0) {
            BIO_printf(bio_err, "unable to get private key from '%s'\n",
                       key_file);
            ERR_print_errors(bio_err);
            return 0;
        }

        /*
         * If we are using DSA, we can copy the parameters from the private
         * key
         */

        /*
         * Now we know that a key and cert have been set against the SSL
         * context
         */
        if (!SSL_CTX_check_private_key(ctx)) {
            BIO_printf(bio_err,
                       "Private key does not match the certificate public key\n");
            return 0;
        }
    }
    return 1;
}

int set_cert_key_stuff(SSL_CTX *ctx, X509 *cert, EVP_PKEY *key,
                       STACK_OF(X509) *chain, int build_chain)
{
    int chflags = chain ? SSL_BUILD_CHAIN_FLAG_CHECK : 0;
    if (cert == NULL)
        return 1;
    if (SSL_CTX_use_certificate(ctx, cert) <= 0) {
        BIO_printf(bio_err, "error setting certificate\n");
        ERR_print_errors(bio_err);
        return 0;
    }

    if (SSL_CTX_use_PrivateKey(ctx, key) <= 0) {
        BIO_printf(bio_err, "error setting private key\n");
        ERR_print_errors(bio_err);
        return 0;
    }

    /*
     * Now we know that a key and cert have been set against the SSL context
     */
    if (!SSL_CTX_check_private_key(ctx)) {
        BIO_printf(bio_err,
                   "Private key does not match the certificate public key\n");
        return 0;
    }
    if (chain && !SSL_CTX_set1_chain(ctx, chain)) {
        BIO_printf(bio_err, "error setting certificate chain\n");
        ERR_print_errors(bio_err);
        return 0;
    }
    if (build_chain && !SSL_CTX_build_cert_chain(ctx, chflags)) {
        BIO_printf(bio_err, "error building certificate chain\n");
        ERR_print_errors(bio_err);
        return 0;
    }
    return 1;
}

static STRINT_PAIR cert_type_list[] = {
    {"RSA sign", TLS_CT_RSA_SIGN},
    {"DSA sign", TLS_CT_DSS_SIGN},
    {"RSA fixed DH", TLS_CT_RSA_FIXED_DH},
    {"DSS fixed DH", TLS_CT_DSS_FIXED_DH},
    {"ECDSA sign", TLS_CT_ECDSA_SIGN},
    {"RSA fixed ECDH", TLS_CT_RSA_FIXED_ECDH},
    {"ECDSA fixed ECDH", TLS_CT_ECDSA_FIXED_ECDH},
    {"GOST01 Sign", TLS_CT_GOST01_SIGN},
    {"GOST12 Sign", TLS_CT_GOST12_SIGN},
    {NULL}
};

static void ssl_print_client_cert_types(BIO *bio, SSL *s)
{
    const unsigned char *p;
    int i;
    int cert_type_num = SSL_get0_certificate_types(s, &p);
    if (!cert_type_num)
        return;
    BIO_puts(bio, "Client Certificate Types: ");
    for (i = 0; i < cert_type_num; i++) {
        unsigned char cert_type = p[i];
        const char *cname = lookup((int)cert_type, cert_type_list, NULL);

        if (i)
            BIO_puts(bio, ", ");
        if (cname != NULL)
            BIO_puts(bio, cname);
        else
            BIO_printf(bio, "UNKNOWN (%d),", cert_type);
    }
    BIO_puts(bio, "\n");
}

static const char *get_sigtype(int nid)
{
    switch (nid) {
    case EVP_PKEY_RSA:
        return "RSA";

    case EVP_PKEY_RSA_PSS:
        return "RSA-PSS";

    case EVP_PKEY_DSA:
        return "DSA";

     case EVP_PKEY_EC:
        return "ECDSA";

     case NID_ED25519:
        return "Ed25519";

     case NID_ED448:
        return "Ed448";

     case NID_id_GostR3410_2001:
        return "gost2001";

     case NID_id_GostR3410_2012_256:
        return "gost2012_256";

     case NID_id_GostR3410_2012_512:
        return "gost2012_512";

    default:
        return NULL;
    }
}

static int do_print_sigalgs(BIO *out, SSL *s, int shared)
{
    int i, nsig, client;
    client = SSL_is_server(s) ? 0 : 1;
    if (shared)
        nsig = SSL_get_shared_sigalgs(s, 0, NULL, NULL, NULL, NULL, NULL);
    else
        nsig = SSL_get_sigalgs(s, -1, NULL, NULL, NULL, NULL, NULL);
    if (nsig == 0)
        return 1;

    if (shared)
        BIO_puts(out, "Shared ");

    if (client)
        BIO_puts(out, "Requested ");
    BIO_puts(out, "Signature Algorithms: ");
    for (i = 0; i < nsig; i++) {
        int hash_nid, sign_nid;
        unsigned char rhash, rsign;
        const char *sstr = NULL;
        if (shared)
            SSL_get_shared_sigalgs(s, i, &sign_nid, &hash_nid, NULL,
                                   &rsign, &rhash);
        else
            SSL_get_sigalgs(s, i, &sign_nid, &hash_nid, NULL, &rsign, &rhash);
        if (i)
            BIO_puts(out, ":");
        sstr = get_sigtype(sign_nid);
        if (sstr)
            BIO_printf(out, "%s", sstr);
        else
            BIO_printf(out, "0x%02X", (int)rsign);
        if (hash_nid != NID_undef)
            BIO_printf(out, "+%s", OBJ_nid2sn(hash_nid));
        else if (sstr == NULL)
            BIO_printf(out, "+0x%02X", (int)rhash);
    }
    BIO_puts(out, "\n");
    return 1;
}

int ssl_print_sigalgs(BIO *out, SSL *s)
{
    int nid;
    if (!SSL_is_server(s))
        ssl_print_client_cert_types(out, s);
    do_print_sigalgs(out, s, 0);
    do_print_sigalgs(out, s, 1);
    if (SSL_get_peer_signature_nid(s, &nid) && nid != NID_undef)
        BIO_printf(out, "Peer signing digest: %s\n", OBJ_nid2sn(nid));
    if (SSL_get_peer_signature_type_nid(s, &nid))
        BIO_printf(out, "Peer signature type: %s\n", get_sigtype(nid));
    return 1;
}

#ifndef OPENSSL_NO_EC
int ssl_print_point_formats(BIO *out, SSL *s)
{
    int i, nformats;
    const char *pformats;
    nformats = SSL_get0_ec_point_formats(s, &pformats);
    if (nformats <= 0)
        return 1;
    BIO_puts(out, "Supported Elliptic Curve Point Formats: ");
    for (i = 0; i < nformats; i++, pformats++) {
        if (i)
            BIO_puts(out, ":");
        switch (*pformats) {
        case TLSEXT_ECPOINTFORMAT_uncompressed:
            BIO_puts(out, "uncompressed");
            break;

        case TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime:
            BIO_puts(out, "ansiX962_compressed_prime");
            break;

        case TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2:
            BIO_puts(out, "ansiX962_compressed_char2");
            break;

        default:
            BIO_printf(out, "unknown(%d)", (int)*pformats);
            break;

        }
    }
    BIO_puts(out, "\n");
    return 1;
}

int ssl_print_groups(BIO *out, SSL *s, int noshared)
{
    int i, ngroups, *groups, nid;
    const char *gname;

    ngroups = SSL_get1_groups(s, NULL);
    if (ngroups <= 0)
        return 1;
    groups = app_malloc(ngroups * sizeof(int), "groups to print");
    SSL_get1_groups(s, groups);

    BIO_puts(out, "Supported Elliptic Groups: ");
    for (i = 0; i < ngroups; i++) {
        if (i)
            BIO_puts(out, ":");
        nid = groups[i];
        /* If unrecognised print out hex version */
        if (nid & TLSEXT_nid_unknown) {
            BIO_printf(out, "0x%04X", nid & 0xFFFF);
        } else {
            /* TODO(TLS1.3): Get group name here */
            /* Use NIST name for curve if it exists */
            gname = EC_curve_nid2nist(nid);
            if (gname == NULL)
                gname = OBJ_nid2sn(nid);
            BIO_printf(out, "%s", gname);
        }
    }
    OPENSSL_free(groups);
    if (noshared) {
        BIO_puts(out, "\n");
        return 1;
    }
    BIO_puts(out, "\nShared Elliptic groups: ");
    ngroups = SSL_get_shared_group(s, -1);
    for (i = 0; i < ngroups; i++) {
        if (i)
            BIO_puts(out, ":");
        nid = SSL_get_shared_group(s, i);
        /* TODO(TLS1.3): Convert for DH groups */
        gname = EC_curve_nid2nist(nid);
        if (gname == NULL)
            gname = OBJ_nid2sn(nid);
        BIO_printf(out, "%s", gname);
    }
    if (ngroups == 0)
        BIO_puts(out, "NONE");
    BIO_puts(out, "\n");
    return 1;
}
#endif

int ssl_print_tmp_key(BIO *out, SSL *s)
{
    EVP_PKEY *key;

    if (!SSL_get_peer_tmp_key(s, &key))
        return 1;
    BIO_puts(out, "Server Temp Key: ");
    switch (EVP_PKEY_id(key)) {
    case EVP_PKEY_RSA:
        BIO_printf(out, "RSA, %d bits\n", EVP_PKEY_bits(key));
        break;

    case EVP_PKEY_DH:
        BIO_printf(out, "DH, %d bits\n", EVP_PKEY_bits(key));
        break;
#ifndef OPENSSL_NO_EC
    case EVP_PKEY_EC:
        {
            EC_KEY *ec = EVP_PKEY_get1_EC_KEY(key);
            int nid;
            const char *cname;
            nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
            EC_KEY_free(ec);
            cname = EC_curve_nid2nist(nid);
            if (cname == NULL)
                cname = OBJ_nid2sn(nid);
            BIO_printf(out, "ECDH, %s, %d bits\n", cname, EVP_PKEY_bits(key));
        }
    break;
#endif
    default:
        BIO_printf(out, "%s, %d bits\n", OBJ_nid2sn(EVP_PKEY_id(key)),
                   EVP_PKEY_bits(key));
    }
    EVP_PKEY_free(key);
    return 1;
}

long bio_dump_callback(BIO *bio, int cmd, const char *argp,
                       int argi, long argl, long ret)
{
    BIO *out;

    out = (BIO *)BIO_get_callback_arg(bio);
    if (out == NULL)
        return ret;

    if (cmd == (BIO_CB_READ | BIO_CB_RETURN)) {
        BIO_printf(out, "read from %p [%p] (%lu bytes => %ld (0x%lX))\n",
                   (void *)bio, (void *)argp, (unsigned long)argi, ret, ret);
        BIO_dump(out, argp, (int)ret);
        return ret;
    } else if (cmd == (BIO_CB_WRITE | BIO_CB_RETURN)) {
        BIO_printf(out, "write to %p [%p] (%lu bytes => %ld (0x%lX))\n",
                   (void *)bio, (void *)argp, (unsigned long)argi, ret, ret);
        BIO_dump(out, argp, (int)ret);
    }
    return ret;
}

void apps_ssl_info_callback(const SSL *s, int where, int ret)
{
    const char *str;
    int w;

    w = where & ~SSL_ST_MASK;

    if (w & SSL_ST_CONNECT)
        str = "SSL_connect";
    else if (w & SSL_ST_ACCEPT)
        str = "SSL_accept";
    else
        str = "undefined";

    if (where & SSL_CB_LOOP) {
        BIO_printf(bio_err, "%s:%s\n", str, SSL_state_string_long(s));
    } else if (where & SSL_CB_ALERT) {
        str = (where & SSL_CB_READ) ? "read" : "write";
        BIO_printf(bio_err, "SSL3 alert %s:%s:%s\n",
                   str,
                   SSL_alert_type_string_long(ret),
                   SSL_alert_desc_string_long(ret));
    } else if (where & SSL_CB_EXIT) {
        if (ret == 0)
            BIO_printf(bio_err, "%s:failed in %s\n",
                       str, SSL_state_string_long(s));
        else if (ret < 0)
            BIO_printf(bio_err, "%s:error in %s\n",
                       str, SSL_state_string_long(s));
    }
}

static STRINT_PAIR ssl_versions[] = {
    {"SSL 3.0", SSL3_VERSION},
    {"TLS 1.0", TLS1_VERSION},
    {"TLS 1.1", TLS1_1_VERSION},
    {"TLS 1.2", TLS1_2_VERSION},
    {"TLS 1.3", TLS1_3_VERSION},
    {"DTLS 1.0", DTLS1_VERSION},
    {"DTLS 1.0 (bad)", DTLS1_BAD_VER},
    {NULL}
};

static STRINT_PAIR alert_types[] = {
    {" close_notify", 0},
    {" end_of_early_data", 1},
    {" unexpected_message", 10},
    {" bad_record_mac", 20},
    {" decryption_failed", 21},
    {" record_overflow", 22},
    {" decompression_failure", 30},
    {" handshake_failure", 40},
    {" bad_certificate", 42},
    {" unsupported_certificate", 43},
    {" certificate_revoked", 44},
    {" certificate_expired", 45},
    {" certificate_unknown", 46},
    {" illegal_parameter", 47},
    {" unknown_ca", 48},
    {" access_denied", 49},
    {" decode_error", 50},
    {" decrypt_error", 51},
    {" export_restriction", 60},
    {" protocol_version", 70},
    {" insufficient_security", 71},
    {" internal_error", 80},
    {" inappropriate_fallback", 86},
    {" user_canceled", 90},
    {" no_renegotiation", 100},
    {" missing_extension", 109},
    {" unsupported_extension", 110},
    {" certificate_unobtainable", 111},
    {" unrecognized_name", 112},
    {" bad_certificate_status_response", 113},
    {" bad_certificate_hash_value", 114},
    {" unknown_psk_identity", 115},
    {" certificate_required", 116},
    {NULL}
};

static STRINT_PAIR handshakes[] = {
    {", HelloRequest", SSL3_MT_HELLO_REQUEST},
    {", ClientHello", SSL3_MT_CLIENT_HELLO},
    {", ServerHello", SSL3_MT_SERVER_HELLO},
    {", HelloVerifyRequest", DTLS1_MT_HELLO_VERIFY_REQUEST},
    {", NewSessionTicket", SSL3_MT_NEWSESSION_TICKET},
    {", EndOfEarlyData", SSL3_MT_END_OF_EARLY_DATA},
    {", EncryptedExtensions", SSL3_MT_ENCRYPTED_EXTENSIONS},
    {", Certificate", SSL3_MT_CERTIFICATE},
    {", ServerKeyExchange", SSL3_MT_SERVER_KEY_EXCHANGE},
    {", CertificateRequest", SSL3_MT_CERTIFICATE_REQUEST},
    {", ServerHelloDone", SSL3_MT_SERVER_DONE},
    {", CertificateVerify", SSL3_MT_CERTIFICATE_VERIFY},
    {", ClientKeyExchange", SSL3_MT_CLIENT_KEY_EXCHANGE},
    {", Finished", SSL3_MT_FINISHED},
    {", CertificateUrl", SSL3_MT_CERTIFICATE_URL},
    {", CertificateStatus", SSL3_MT_CERTIFICATE_STATUS},
    {", SupplementalData", SSL3_MT_SUPPLEMENTAL_DATA},
    {", KeyUpdate", SSL3_MT_KEY_UPDATE},
#ifndef OPENSSL_NO_NEXTPROTONEG
    {", NextProto", SSL3_MT_NEXT_PROTO},
#endif
    {", MessageHash", SSL3_MT_MESSAGE_HASH},
    {NULL}
};

void msg_cb(int write_p, int version, int content_type, const void *buf,
            size_t len, SSL *ssl, void *arg)
{
    BIO *bio = arg;
    const char *str_write_p = write_p ? ">>>" : "<<<";
    const char *str_version = lookup(version, ssl_versions, "???");
    const char *str_content_type = "", *str_details1 = "", *str_details2 = "";
    const unsigned char* bp = buf;

    if (version == SSL3_VERSION ||
        version == TLS1_VERSION ||
        version == TLS1_1_VERSION ||
        version == TLS1_2_VERSION ||
        version == TLS1_3_VERSION ||
        version == DTLS1_VERSION || version == DTLS1_BAD_VER) {
        switch (content_type) {
        case 20:
            str_content_type = ", ChangeCipherSpec";
            break;
        case 21:
            str_content_type = ", Alert";
            str_details1 = ", ???";
            if (len == 2) {
                switch (bp[0]) {
                case 1:
                    str_details1 = ", warning";
                    break;
                case 2:
                    str_details1 = ", fatal";
                    break;
                }
                str_details2 = lookup((int)bp[1], alert_types, " ???");
            }
            break;
        case 22:
            str_content_type = ", Handshake";
            str_details1 = "???";
            if (len > 0)
                str_details1 = lookup((int)bp[0], handshakes, "???");
            break;
        case 23:
            str_content_type = ", ApplicationData";
            break;
#ifndef OPENSSL_NO_HEARTBEATS
        case 24:
            str_details1 = ", Heartbeat";

            if (len > 0) {
                switch (bp[0]) {
                case 1:
                    str_details1 = ", HeartbeatRequest";
                    break;
                case 2:
                    str_details1 = ", HeartbeatResponse";
                    break;
                }
            }
            break;
#endif
        }
    }

    BIO_printf(bio, "%s %s%s [length %04lx]%s%s\n", str_write_p, str_version,
               str_content_type, (unsigned long)len, str_details1,
               str_details2);

    if (len > 0) {
        size_t num, i;

        BIO_printf(bio, "   ");
        num = len;
        for (i = 0; i < num; i++) {
            if (i % 16 == 0 && i > 0)
                BIO_printf(bio, "\n   ");
            BIO_printf(bio, " %02x", ((const unsigned char *)buf)[i]);
        }
        if (i < len)
            BIO_printf(bio, " ...");
        BIO_printf(bio, "\n");
    }
    (void)BIO_flush(bio);
}

static STRINT_PAIR tlsext_types[] = {
    {"server name", TLSEXT_TYPE_server_name},
    {"max fragment length", TLSEXT_TYPE_max_fragment_length},
    {"client certificate URL", TLSEXT_TYPE_client_certificate_url},
    {"trusted CA keys", TLSEXT_TYPE_trusted_ca_keys},
    {"truncated HMAC", TLSEXT_TYPE_truncated_hmac},
    {"status request", TLSEXT_TYPE_status_request},
    {"user mapping", TLSEXT_TYPE_user_mapping},
    {"client authz", TLSEXT_TYPE_client_authz},
    {"server authz", TLSEXT_TYPE_server_authz},
    {"cert type", TLSEXT_TYPE_cert_type},
    {"supported_groups", TLSEXT_TYPE_supported_groups},
    {"EC point formats", TLSEXT_TYPE_ec_point_formats},
    {"SRP", TLSEXT_TYPE_srp},
    {"signature algorithms", TLSEXT_TYPE_signature_algorithms},
    {"use SRTP", TLSEXT_TYPE_use_srtp},
    {"heartbeat", TLSEXT_TYPE_heartbeat},
    {"session ticket", TLSEXT_TYPE_session_ticket},
    {"renegotiation info", TLSEXT_TYPE_renegotiate},
    {"signed certificate timestamps", TLSEXT_TYPE_signed_certificate_timestamp},
    {"TLS padding", TLSEXT_TYPE_padding},
#ifdef TLSEXT_TYPE_next_proto_neg
    {"next protocol", TLSEXT_TYPE_next_proto_neg},
#endif
#ifdef TLSEXT_TYPE_encrypt_then_mac
    {"encrypt-then-mac", TLSEXT_TYPE_encrypt_then_mac},
#endif
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
    {"application layer protocol negotiation",
     TLSEXT_TYPE_application_layer_protocol_negotiation},
#endif
#ifdef TLSEXT_TYPE_extended_master_secret
    {"extended master secret", TLSEXT_TYPE_extended_master_secret},
#endif
    {"key share", TLSEXT_TYPE_key_share},
    {"supported versions", TLSEXT_TYPE_supported_versions},
    {"psk", TLSEXT_TYPE_psk},
    {"psk kex modes", TLSEXT_TYPE_psk_kex_modes},
    {"certificate authorities", TLSEXT_TYPE_certificate_authorities},
    {"post handshake auth", TLSEXT_TYPE_post_handshake_auth},
    {NULL}
};

/* from rfc8446 4.2.3. + gost (https://tools.ietf.org/id/draft-smyshlyaev-tls12-gost-suites-04.html) */
static STRINT_PAIR signature_tls13_scheme_list[] = {
    {"rsa_pkcs1_sha1",         0x0201 /* TLSEXT_SIGALG_rsa_pkcs1_sha1 */},
    {"ecdsa_sha1",             0x0203 /* TLSEXT_SIGALG_ecdsa_sha1 */},
/*  {"rsa_pkcs1_sha224",       0x0301    TLSEXT_SIGALG_rsa_pkcs1_sha224}, not in rfc8446 */
/*  {"ecdsa_sha224",           0x0303    TLSEXT_SIGALG_ecdsa_sha224}      not in rfc8446 */
    {"rsa_pkcs1_sha256",       0x0401 /* TLSEXT_SIGALG_rsa_pkcs1_sha256 */},
    {"ecdsa_secp256r1_sha256", 0x0403 /* TLSEXT_SIGALG_ecdsa_secp256r1_sha256 */},
    {"rsa_pkcs1_sha384",       0x0501 /* TLSEXT_SIGALG_rsa_pkcs1_sha384 */},
    {"ecdsa_secp384r1_sha384", 0x0503 /* TLSEXT_SIGALG_ecdsa_secp384r1_sha384 */},
    {"rsa_pkcs1_sha512",       0x0601 /* TLSEXT_SIGALG_rsa_pkcs1_sha512 */},
    {"ecdsa_secp521r1_sha512", 0x0603 /* TLSEXT_SIGALG_ecdsa_secp521r1_sha512 */},
    {"rsa_pss_rsae_sha256",    0x0804 /* TLSEXT_SIGALG_rsa_pss_rsae_sha256 */},
    {"rsa_pss_rsae_sha384",    0x0805 /* TLSEXT_SIGALG_rsa_pss_rsae_sha384 */},
    {"rsa_pss_rsae_sha512",    0x0806 /* TLSEXT_SIGALG_rsa_pss_rsae_sha512 */},
    {"ed25519",                0x0807 /* TLSEXT_SIGALG_ed25519 */},
    {"ed448",                  0x0808 /* TLSEXT_SIGALG_ed448 */},
    {"rsa_pss_pss_sha256",     0x0809 /* TLSEXT_SIGALG_rsa_pss_pss_sha256 */},
    {"rsa_pss_pss_sha384",     0x080a /* TLSEXT_SIGALG_rsa_pss_pss_sha384 */},
    {"rsa_pss_pss_sha512",     0x080b /* TLSEXT_SIGALG_rsa_pss_pss_sha512 */},
    {"gostr34102001",          0xeded /* TLSEXT_SIGALG_gostr34102001_gostr3411 */},
    {"gostr34102012_256",      0xeeee /* TLSEXT_SIGALG_gostr34102012_256_gostr34112012_256 */},
    {"gostr34102012_512",      0xefef /* TLSEXT_SIGALG_gostr34102012_512_gostr34112012_512 */},
    {NULL}
};

/* from rfc5246 7.4.1.4.1. */
static STRINT_PAIR signature_tls12_alg_list[] = {
    {"anonymous", TLSEXT_signature_anonymous /* 0 */},
    {"RSA",       TLSEXT_signature_rsa       /* 1 */},
    {"DSA",       TLSEXT_signature_dsa       /* 2 */},
    {"ECDSA",     TLSEXT_signature_ecdsa     /* 3 */},
    {NULL}
};

/* from rfc5246 7.4.1.4.1. */
static STRINT_PAIR signature_tls12_hash_list[] = {
    {"none",   TLSEXT_hash_none   /* 0 */},
    {"MD5",    TLSEXT_hash_md5    /* 1 */},
    {"SHA1",   TLSEXT_hash_sha1   /* 2 */},
    {"SHA224", TLSEXT_hash_sha224 /* 3 */},
    {"SHA256", TLSEXT_hash_sha256 /* 4 */},
    {"SHA384", TLSEXT_hash_sha384 /* 5 */},
    {"SHA512", TLSEXT_hash_sha512 /* 6 */},
    {NULL}
};

void tlsext_cb(SSL *s, int client_server, int type,
               const unsigned char *data, int len, void *arg)
{
    BIO *bio = arg;
    const char *extname = lookup(type, tlsext_types, "unknown");

    BIO_printf(bio, "TLS %s extension \"%s\" (id=%d), len=%d\n",
               client_server ? "server" : "client", extname, type, len);
    BIO_dump(bio, (const char *)data, len);
    (void)BIO_flush(bio);
}

#ifndef OPENSSL_NO_SOCK
int generate_cookie_callback(SSL *ssl, unsigned char *cookie,
                             unsigned int *cookie_len)
{
    unsigned char *buffer;
    size_t length = 0;
    unsigned short port;
    BIO_ADDR *lpeer = NULL, *peer = NULL;

    /* Initialize a random secret */
    if (!cookie_initialized) {
        if (RAND_bytes(cookie_secret, COOKIE_SECRET_LENGTH) <= 0) {
            BIO_printf(bio_err, "error setting random cookie secret\n");
            return 0;
        }
        cookie_initialized = 1;
    }

    if (SSL_is_dtls(ssl)) {
        lpeer = peer = BIO_ADDR_new();
        if (peer == NULL) {
            BIO_printf(bio_err, "memory full\n");
            return 0;
        }

        /* Read peer information */
        (void)BIO_dgram_get_peer(SSL_get_rbio(ssl), peer);
    } else {
        peer = ourpeer;
    }

    /* Create buffer with peer's address and port */
    if (!BIO_ADDR_rawaddress(peer, NULL, &length)) {
        BIO_printf(bio_err, "Failed getting peer address\n");
        return 0;
    }
    OPENSSL_assert(length != 0);
    port = BIO_ADDR_rawport(peer);
    length += sizeof(port);
    buffer = app_malloc(length, "cookie generate buffer");

    memcpy(buffer, &port, sizeof(port));
    BIO_ADDR_rawaddress(peer, buffer + sizeof(port), NULL);

    /* Calculate HMAC of buffer using the secret */
    HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
         buffer, length, cookie, cookie_len);

    OPENSSL_free(buffer);
    BIO_ADDR_free(lpeer);

    return 1;
}

int verify_cookie_callback(SSL *ssl, const unsigned char *cookie,
                           unsigned int cookie_len)
{
    unsigned char result[EVP_MAX_MD_SIZE];
    unsigned int resultlength;

    /* Note: we check cookie_initialized because if it's not,
     * it cannot be valid */
    if (cookie_initialized
        && generate_cookie_callback(ssl, result, &resultlength)
        && cookie_len == resultlength
        && memcmp(result, cookie, resultlength) == 0)
        return 1;

    return 0;
}

int generate_stateless_cookie_callback(SSL *ssl, unsigned char *cookie,
                                       size_t *cookie_len)
{
    unsigned int temp;
    int res = generate_cookie_callback(ssl, cookie, &temp);
    *cookie_len = temp;
    return res;
}

int verify_stateless_cookie_callback(SSL *ssl, const unsigned char *cookie,
                                     size_t cookie_len)
{
    return verify_cookie_callback(ssl, cookie, cookie_len);
}

#endif

/*
 * Example of extended certificate handling. Where the standard support of
 * one certificate per algorithm is not sufficient an application can decide
 * which certificate(s) to use at runtime based on whatever criteria it deems
 * appropriate.
 */

/* Linked list of certificates, keys and chains */
struct ssl_excert_st {
    int certform;
    const char *certfile;
    int keyform;
    const char *keyfile;
    const char *chainfile;
    X509 *cert;
    EVP_PKEY *key;
    STACK_OF(X509) *chain;
    int build_chain;
    struct ssl_excert_st *next, *prev;
};

static STRINT_PAIR chain_flags[] = {
    {"Overall Validity", CERT_PKEY_VALID},
    {"Sign with EE key", CERT_PKEY_SIGN},
    {"EE signature", CERT_PKEY_EE_SIGNATURE},
    {"CA signature", CERT_PKEY_CA_SIGNATURE},
    {"EE key parameters", CERT_PKEY_EE_PARAM},
    {"CA key parameters", CERT_PKEY_CA_PARAM},
    {"Explicitly sign with EE key", CERT_PKEY_EXPLICIT_SIGN},
    {"Issuer Name", CERT_PKEY_ISSUER_NAME},
    {"Certificate Type", CERT_PKEY_CERT_TYPE},
    {NULL}
};

static void print_chain_flags(SSL *s, int flags)
{
    STRINT_PAIR *pp;

    for (pp = chain_flags; pp->name; ++pp)
        BIO_printf(bio_err, "\t%s: %s\n",
                   pp->name,
                   (flags & pp->retval) ? "OK" : "NOT OK");
    BIO_printf(bio_err, "\tSuite B: ");
    if (SSL_set_cert_flags(s, 0) & SSL_CERT_FLAG_SUITEB_128_LOS)
        BIO_puts(bio_err, flags & CERT_PKEY_SUITEB ? "OK\n" : "NOT OK\n");
    else
        BIO_printf(bio_err, "not tested\n");
}

/*
 * Very basic selection callback: just use any certificate chain reported as
 * valid. More sophisticated could prioritise according to local policy.
 */
static int set_cert_cb(SSL *ssl, void *arg)
{
    int i, rv;
    SSL_EXCERT *exc = arg;
#ifdef CERT_CB_TEST_RETRY
    static int retry_cnt;
    if (retry_cnt < 5) {
        retry_cnt++;
        BIO_printf(bio_err,
                   "Certificate callback retry test: count %d\n",
                   retry_cnt);
        return -1;
    }
#endif
    SSL_certs_clear(ssl);

    if (exc == NULL)
        return 1;

    /*
     * Go to end of list and traverse backwards since we prepend newer
     * entries this retains the original order.
     */
    while (exc->next != NULL)
        exc = exc->next;

    i = 0;

    while (exc != NULL) {
        i++;
        rv = SSL_check_chain(ssl, exc->cert, exc->key, exc->chain);
        BIO_printf(bio_err, "Checking cert chain %d:\nSubject: ", i);
        X509_NAME_print_ex(bio_err, X509_get_subject_name(exc->cert), 0,
                           get_nameopt());
        BIO_puts(bio_err, "\n");
        print_chain_flags(ssl, rv);
        if (rv & CERT_PKEY_VALID) {
            if (!SSL_use_certificate(ssl, exc->cert)
                    || !SSL_use_PrivateKey(ssl, exc->key)) {
                return 0;
            }
            /*
             * NB: we wouldn't normally do this as it is not efficient
             * building chains on each connection better to cache the chain
             * in advance.
             */
            if (exc->build_chain) {
                if (!SSL_build_cert_chain(ssl, 0))
                    return 0;
            } else if (exc->chain != NULL) {
                if (!SSL_set1_chain(ssl, exc->chain))
                    return 0;
            }
        }
        exc = exc->prev;
    }
    return 1;
}

void ssl_ctx_set_excert(SSL_CTX *ctx, SSL_EXCERT *exc)
{
    SSL_CTX_set_cert_cb(ctx, set_cert_cb, exc);
}

static int ssl_excert_prepend(SSL_EXCERT **pexc)
{
    SSL_EXCERT *exc = app_malloc(sizeof(*exc), "prepend cert");

    memset(exc, 0, sizeof(*exc));

    exc->next = *pexc;
    *pexc = exc;

    if (exc->next) {
        exc->certform = exc->next->certform;
        exc->keyform = exc->next->keyform;
        exc->next->prev = exc;
    } else {
        exc->certform = FORMAT_PEM;
        exc->keyform = FORMAT_PEM;
    }
    return 1;

}

void ssl_excert_free(SSL_EXCERT *exc)
{
    SSL_EXCERT *curr;

    if (exc == NULL)
        return;
    while (exc) {
        X509_free(exc->cert);
        EVP_PKEY_free(exc->key);
        sk_X509_pop_free(exc->chain, X509_free);
        curr = exc;
        exc = exc->next;
        OPENSSL_free(curr);
    }
}

int load_excert(SSL_EXCERT **pexc)
{
    SSL_EXCERT *exc = *pexc;
    if (exc == NULL)
        return 1;
    /* If nothing in list, free and set to NULL */
    if (exc->certfile == NULL && exc->next == NULL) {
        ssl_excert_free(exc);
        *pexc = NULL;
        return 1;
    }
    for (; exc; exc = exc->next) {
        if (exc->certfile == NULL) {
            BIO_printf(bio_err, "Missing filename\n");
            return 0;
        }
        exc->cert = load_cert(exc->certfile, exc->certform,
                              "Server Certificate");
        if (exc->cert == NULL)
            return 0;
        if (exc->keyfile != NULL) {
            exc->key = load_key(exc->keyfile, exc->keyform,
                                0, NULL, NULL, "Server Key");
        } else {
            exc->key = load_key(exc->certfile, exc->certform,
                                0, NULL, NULL, "Server Key");
        }
        if (exc->key == NULL)
            return 0;
        if (exc->chainfile != NULL) {
            if (!load_certs(exc->chainfile, &exc->chain, FORMAT_PEM, NULL,
                            "Server Chain"))
                return 0;
        }
    }
    return 1;
}

enum range { OPT_X_ENUM };

int args_excert(int opt, SSL_EXCERT **pexc)
{
    SSL_EXCERT *exc = *pexc;

    assert(opt > OPT_X__FIRST);
    assert(opt < OPT_X__LAST);

    if (exc == NULL) {
        if (!ssl_excert_prepend(&exc)) {
            BIO_printf(bio_err, " %s: Error initialising xcert\n",
                       opt_getprog());
            goto err;
        }
        *pexc = exc;
    }

    switch ((enum range)opt) {
    case OPT_X__FIRST:
    case OPT_X__LAST:
        return 0;
    case OPT_X_CERT:
        if (exc->certfile != NULL && !ssl_excert_prepend(&exc)) {
            BIO_printf(bio_err, "%s: Error adding xcert\n", opt_getprog());
            goto err;
        }
        *pexc = exc;
        exc->certfile = opt_arg();
        break;
    case OPT_X_KEY:
        if (exc->keyfile != NULL) {
            BIO_printf(bio_err, "%s: Key already specified\n", opt_getprog());
            goto err;
        }
        exc->keyfile = opt_arg();
        break;
    case OPT_X_CHAIN:
        if (exc->chainfile != NULL) {
            BIO_printf(bio_err, "%s: Chain already specified\n",
                       opt_getprog());
            goto err;
        }
        exc->chainfile = opt_arg();
        break;
    case OPT_X_CHAIN_BUILD:
        exc->build_chain = 1;
        break;
    case OPT_X_CERTFORM:
        if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &exc->certform))
            return 0;
        break;
    case OPT_X_KEYFORM:
        if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &exc->keyform))
            return 0;
        break;
    }
    return 1;

 err:
    ERR_print_errors(bio_err);
    ssl_excert_free(exc);
    *pexc = NULL;
    return 0;
}

static void print_raw_cipherlist(SSL *s)
{
    const unsigned char *rlist;
    static const unsigned char scsv_id[] = { 0, 0xFF };
    size_t i, rlistlen, num;
    if (!SSL_is_server(s))
        return;
    num = SSL_get0_raw_cipherlist(s, NULL);
    OPENSSL_assert(num == 2);
    rlistlen = SSL_get0_raw_cipherlist(s, &rlist);
    BIO_puts(bio_err, "Client cipher list: ");
    for (i = 0; i < rlistlen; i += num, rlist += num) {
        const SSL_CIPHER *c = SSL_CIPHER_find(s, rlist);
        if (i)
            BIO_puts(bio_err, ":");
        if (c != NULL) {
            BIO_puts(bio_err, SSL_CIPHER_get_name(c));
        } else if (memcmp(rlist, scsv_id, num) == 0) {
            BIO_puts(bio_err, "SCSV");
        } else {
            size_t j;
            BIO_puts(bio_err, "0x");
            for (j = 0; j < num; j++)
                BIO_printf(bio_err, "%02X", rlist[j]);
        }
    }
    BIO_puts(bio_err, "\n");
}

/*
 * Hex encoder for TLSA RRdata, not ':' delimited.
 */
static char *hexencode(const unsigned char *data, size_t len)
{
    static const char *hex = "0123456789abcdef";
    char *out;
    char *cp;
    size_t outlen = 2 * len + 1;
    int ilen = (int) outlen;

    if (outlen < len || ilen < 0 || outlen != (size_t)ilen) {
        BIO_printf(bio_err, "%s: %zu-byte buffer too large to hexencode\n",
                   opt_getprog(), len);
        exit(1);
    }
    cp = out = app_malloc(ilen, "TLSA hex data buffer");

    while (len-- > 0) {
        *cp++ = hex[(*data >> 4) & 0x0f];
        *cp++ = hex[*data++ & 0x0f];
    }
    *cp = '\0';
    return out;
}

void print_verify_detail(SSL *s, BIO *bio)
{
    int mdpth;
    EVP_PKEY *mspki;
    long verify_err = SSL_get_verify_result(s);

    if (verify_err == X509_V_OK) {
        const char *peername = SSL_get0_peername(s);

        BIO_printf(bio, "Verification: OK\n");
        if (peername != NULL)
            BIO_printf(bio, "Verified peername: %s\n", peername);
    } else {
        const char *reason = X509_verify_cert_error_string(verify_err);

        BIO_printf(bio, "Verification error: %s\n", reason);
    }

    if ((mdpth = SSL_get0_dane_authority(s, NULL, &mspki)) >= 0) {
        uint8_t usage, selector, mtype;
        const unsigned char *data = NULL;
        size_t dlen = 0;
        char *hexdata;

        mdpth = SSL_get0_dane_tlsa(s, &usage, &selector, &mtype, &data, &dlen);

        /*
         * The TLSA data field can be quite long when it is a certificate,
         * public key or even a SHA2-512 digest.  Because the initial octets of
         * ASN.1 certificates and public keys contain mostly boilerplate OIDs
         * and lengths, we show the last 12 bytes of the data instead, as these
         * are more likely to distinguish distinct TLSA records.
         */
#define TLSA_TAIL_SIZE 12
        if (dlen > TLSA_TAIL_SIZE)
            hexdata = hexencode(data + dlen - TLSA_TAIL_SIZE, TLSA_TAIL_SIZE);
        else
            hexdata = hexencode(data, dlen);
        BIO_printf(bio, "DANE TLSA %d %d %d %s%s %s at depth %d\n",
                   usage, selector, mtype,
                   (dlen > TLSA_TAIL_SIZE) ? "..." : "", hexdata,
                   (mspki != NULL) ? "signed the certificate" :
                   mdpth ? "matched TA certificate" : "matched EE certificate",
                   mdpth);
        OPENSSL_free(hexdata);
    }
}

void print_ssl_summary(SSL *s)
{
    const SSL_CIPHER *c;
    X509 *peer;

    BIO_printf(bio_err, "Protocol version: %s\n", SSL_get_version(s));
    print_raw_cipherlist(s);
    c = SSL_get_current_cipher(s);
    BIO_printf(bio_err, "Ciphersuite: %s\n", SSL_CIPHER_get_name(c));
    do_print_sigalgs(bio_err, s, 0);
    peer = SSL_get_peer_certificate(s);
    if (peer != NULL) {
        int nid;

        BIO_puts(bio_err, "Peer certificate: ");
        X509_NAME_print_ex(bio_err, X509_get_subject_name(peer),
                           0, get_nameopt());
        BIO_puts(bio_err, "\n");
        if (SSL_get_peer_signature_nid(s, &nid))
            BIO_printf(bio_err, "Hash used: %s\n", OBJ_nid2sn(nid));
        if (SSL_get_peer_signature_type_nid(s, &nid))
            BIO_printf(bio_err, "Signature type: %s\n", get_sigtype(nid));
        print_verify_detail(s, bio_err);
    } else {
        BIO_puts(bio_err, "No peer certificate\n");
    }
    X509_free(peer);
#ifndef OPENSSL_NO_EC
    ssl_print_point_formats(bio_err, s);
    if (SSL_is_server(s))
        ssl_print_groups(bio_err, s, 1);
    else
        ssl_print_tmp_key(bio_err, s);
#else
    if (!SSL_is_server(s))
        ssl_print_tmp_key(bio_err, s);
#endif
}

int config_ctx(SSL_CONF_CTX *cctx, STACK_OF(OPENSSL_STRING) *str,
               SSL_CTX *ctx)
{
    int i;

    SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
    for (i = 0; i < sk_OPENSSL_STRING_num(str); i += 2) {
        const char *flag = sk_OPENSSL_STRING_value(str, i);
        const char *arg = sk_OPENSSL_STRING_value(str, i + 1);
        if (SSL_CONF_cmd(cctx, flag, arg) <= 0) {
            if (arg != NULL)
                BIO_printf(bio_err, "Error with command: \"%s %s\"\n",
                           flag, arg);
            else
                BIO_printf(bio_err, "Error with command: \"%s\"\n", flag);
            ERR_print_errors(bio_err);
            return 0;
        }
    }
    if (!SSL_CONF_CTX_finish(cctx)) {
        BIO_puts(bio_err, "Error finishing context\n");
        ERR_print_errors(bio_err);
        return 0;
    }
    return 1;
}

static int add_crls_store(X509_STORE *st, STACK_OF(X509_CRL) *crls)
{
    X509_CRL *crl;
    int i;
    for (i = 0; i < sk_X509_CRL_num(crls); i++) {
        crl = sk_X509_CRL_value(crls, i);
        X509_STORE_add_crl(st, crl);
    }
    return 1;
}

int ssl_ctx_add_crls(SSL_CTX *ctx, STACK_OF(X509_CRL) *crls, int crl_download)
{
    X509_STORE *st;
    st = SSL_CTX_get_cert_store(ctx);
    add_crls_store(st, crls);
    if (crl_download)
        store_setup_crl_download(st);
    return 1;
}

int ssl_load_stores(SSL_CTX *ctx,
                    const char *vfyCApath, const char *vfyCAfile,
                    const char *chCApath, const char *chCAfile,
                    STACK_OF(X509_CRL) *crls, int crl_download)
{
    X509_STORE *vfy = NULL, *ch = NULL;
    int rv = 0;
    if (vfyCApath != NULL || vfyCAfile != NULL) {
        vfy = X509_STORE_new();
        if (vfy == NULL)
            goto err;
        if (!X509_STORE_load_locations(vfy, vfyCAfile, vfyCApath))
            goto err;
        add_crls_store(vfy, crls);
        SSL_CTX_set1_verify_cert_store(ctx, vfy);
        if (crl_download)
            store_setup_crl_download(vfy);
    }
    if (chCApath != NULL || chCAfile != NULL) {
        ch = X509_STORE_new();
        if (ch == NULL)
            goto err;
        if (!X509_STORE_load_locations(ch, chCAfile, chCApath))
            goto err;
        SSL_CTX_set1_chain_cert_store(ctx, ch);
    }
    rv = 1;
 err:
    X509_STORE_free(vfy);
    X509_STORE_free(ch);
    return rv;
}

/* Verbose print out of security callback */

typedef struct {
    BIO *out;
    int verbose;
    int (*old_cb) (const SSL *s, const SSL_CTX *ctx, int op, int bits, int nid,
                   void *other, void *ex);
} security_debug_ex;

static STRINT_PAIR callback_types[] = {
    {"Supported Ciphersuite", SSL_SECOP_CIPHER_SUPPORTED},
    {"Shared Ciphersuite", SSL_SECOP_CIPHER_SHARED},
    {"Check Ciphersuite", SSL_SECOP_CIPHER_CHECK},
#ifndef OPENSSL_NO_DH
    {"Temp DH key bits", SSL_SECOP_TMP_DH},
#endif
    {"Supported Curve", SSL_SECOP_CURVE_SUPPORTED},
    {"Shared Curve", SSL_SECOP_CURVE_SHARED},
    {"Check Curve", SSL_SECOP_CURVE_CHECK},
    {"Supported Signature Algorithm", SSL_SECOP_SIGALG_SUPPORTED},
    {"Shared Signature Algorithm", SSL_SECOP_SIGALG_SHARED},
    {"Check Signature Algorithm", SSL_SECOP_SIGALG_CHECK},
    {"Signature Algorithm mask", SSL_SECOP_SIGALG_MASK},
    {"Certificate chain EE key", SSL_SECOP_EE_KEY},
    {"Certificate chain CA key", SSL_SECOP_CA_KEY},
    {"Peer Chain EE key", SSL_SECOP_PEER_EE_KEY},
    {"Peer Chain CA key", SSL_SECOP_PEER_CA_KEY},
    {"Certificate chain CA digest", SSL_SECOP_CA_MD},
    {"Peer chain CA digest", SSL_SECOP_PEER_CA_MD},
    {"SSL compression", SSL_SECOP_COMPRESSION},
    {"Session ticket", SSL_SECOP_TICKET},
    {NULL}
};

static int security_callback_debug(const SSL *s, const SSL_CTX *ctx,
                                   int op, int bits, int nid,
                                   void *other, void *ex)
{
    security_debug_ex *sdb = ex;
    int rv, show_bits = 1, cert_md = 0;
    const char *nm;
    int show_nm;
    rv = sdb->old_cb(s, ctx, op, bits, nid, other, ex);
    if (rv == 1 && sdb->verbose < 2)
        return 1;
    BIO_puts(sdb->out, "Security callback: ");

    nm = lookup(op, callback_types, NULL);
    show_nm = nm != NULL;
    switch (op) {
    case SSL_SECOP_TICKET:
    case SSL_SECOP_COMPRESSION:
        show_bits = 0;
        show_nm = 0;
        break;
    case SSL_SECOP_VERSION:
        BIO_printf(sdb->out, "Version=%s", lookup(nid, ssl_versions, "???"));
        show_bits = 0;
        show_nm = 0;
        break;
    case SSL_SECOP_CA_MD:
    case SSL_SECOP_PEER_CA_MD:
        cert_md = 1;
        break;
    case SSL_SECOP_SIGALG_SUPPORTED:
    case SSL_SECOP_SIGALG_SHARED:
    case SSL_SECOP_SIGALG_CHECK:
    case SSL_SECOP_SIGALG_MASK:
        show_nm = 0;
        break;
    }
    if (show_nm)
        BIO_printf(sdb->out, "%s=", nm);

    switch (op & SSL_SECOP_OTHER_TYPE) {

    case SSL_SECOP_OTHER_CIPHER:
        BIO_puts(sdb->out, SSL_CIPHER_get_name(other));
        break;

#ifndef OPENSSL_NO_EC
    case SSL_SECOP_OTHER_CURVE:
        {
            const char *cname;
            cname = EC_curve_nid2nist(nid);
            if (cname == NULL)
                cname = OBJ_nid2sn(nid);
            BIO_puts(sdb->out, cname);
        }
        break;
#endif
#ifndef OPENSSL_NO_DH
    case SSL_SECOP_OTHER_DH:
        {
            DH *dh = other;
            BIO_printf(sdb->out, "%d", DH_bits(dh));
            break;
        }
#endif
    case SSL_SECOP_OTHER_CERT:
        {
            if (cert_md) {
                int sig_nid = X509_get_signature_nid(other);
                BIO_puts(sdb->out, OBJ_nid2sn(sig_nid));
            } else {
                EVP_PKEY *pkey = X509_get0_pubkey(other);
                const char *algname = "";
                EVP_PKEY_asn1_get0_info(NULL, NULL, NULL, NULL,
                                        &algname, EVP_PKEY_get0_asn1(pkey));
                BIO_printf(sdb->out, "%s, bits=%d",
                           algname, EVP_PKEY_bits(pkey));
            }
            break;
        }
    case SSL_SECOP_OTHER_SIGALG:
        {
            const unsigned char *salg = other;
            const char *sname = NULL;
            int raw_sig_code = (salg[0] << 8) + salg[1]; /* always big endian (msb, lsb) */
                /* raw_sig_code: signature_scheme from tls1.3, or signature_and_hash from tls1.2 */

            if (nm != NULL)
                BIO_printf(sdb->out, "%s", nm);
            else
                BIO_printf(sdb->out, "s_cb.c:security_callback_debug op=0x%x", op);

            sname = lookup(raw_sig_code, signature_tls13_scheme_list, NULL);
            if (sname != NULL) {
                BIO_printf(sdb->out, " scheme=%s", sname);
            } else {
                int alg_code = salg[1];
                int hash_code = salg[0];
                const char *alg_str = lookup(alg_code, signature_tls12_alg_list, NULL);
                const char *hash_str = lookup(hash_code, signature_tls12_hash_list, NULL);

                if (alg_str != NULL && hash_str != NULL)
                    BIO_printf(sdb->out, " digest=%s, algorithm=%s", hash_str, alg_str);
                else
                    BIO_printf(sdb->out, " scheme=unknown(0x%04x)", raw_sig_code);
            }
        }

    }

    if (show_bits)
        BIO_printf(sdb->out, ", security bits=%d", bits);
    BIO_printf(sdb->out, ": %s\n", rv ? "yes" : "no");
    return rv;
}

void ssl_ctx_security_debug(SSL_CTX *ctx, int verbose)
{
    static security_debug_ex sdb;

    sdb.out = bio_err;
    sdb.verbose = verbose;
    sdb.old_cb = SSL_CTX_get_security_callback(ctx);
    SSL_CTX_set_security_callback(ctx, security_callback_debug);
    SSL_CTX_set0_security_ex_data(ctx, &sdb);
}

static void keylog_callback(const SSL *ssl, const char *line)
{
    if (bio_keylog == NULL) {
        BIO_printf(bio_err, "Keylog callback is invoked without valid file!\n");
        return;
    }

    /*
     * There might be concurrent writers to the keylog file, so we must ensure
     * that the given line is written at once.
     */
    BIO_printf(bio_keylog, "%s\n", line);
    (void)BIO_flush(bio_keylog);
}

int set_keylog_file(SSL_CTX *ctx, const char *keylog_file)
{
    /* Close any open files */
    BIO_free_all(bio_keylog);
    bio_keylog = NULL;

    if (ctx == NULL || keylog_file == NULL) {
        /* Keylogging is disabled, OK. */
        return 0;
    }

    /*
     * Append rather than write in order to allow concurrent modification.
     * Furthermore, this preserves existing keylog files which is useful when
     * the tool is run multiple times.
     */
    bio_keylog = BIO_new_file(keylog_file, "a");
    if (bio_keylog == NULL) {
        BIO_printf(bio_err, "Error writing keylog file %s\n", keylog_file);
        return 1;
    }

    /* Write a header for seekable, empty files (this excludes pipes). */
    if (BIO_tell(bio_keylog) == 0) {
        BIO_puts(bio_keylog,
                 "# SSL/TLS secrets log file, generated by OpenSSL\n");
        (void)BIO_flush(bio_keylog);
    }
    SSL_CTX_set_keylog_callback(ctx, keylog_callback);
    return 0;
}

void print_ca_names(BIO *bio, SSL *s)
{
    const char *cs = SSL_is_server(s) ? "server" : "client";
    const STACK_OF(X509_NAME) *sk = SSL_get0_peer_CA_list(s);
    int i;

    if (sk == NULL || sk_X509_NAME_num(sk) == 0) {
        if (!SSL_is_server(s))
            BIO_printf(bio, "---\nNo %s certificate CA names sent\n", cs);
        return;
    }

    BIO_printf(bio, "---\nAcceptable %s certificate CA names\n",cs);
    for (i = 0; i < sk_X509_NAME_num(sk); i++) {
        X509_NAME_print_ex(bio, sk_X509_NAME_value(sk, i), 0, get_nameopt());
        BIO_write(bio, "\n", 1);
    }
}