aboutsummaryrefslogtreecommitdiffstats
path: root/ssl/ssl_cert.c
blob: 52a4a7eaadd2028784172ba76e91ec5c994d5371 (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
/*
 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
 * Copyright (c) 2002, Oracle and/or its affiliates. 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
 */

#include <stdio.h>
#include <sys/types.h>

#include "internal/nelem.h"
#include "internal/o_dir.h"
#include <openssl/bio.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>
#include <openssl/dh.h>
#include <openssl/bn.h>
#include <openssl/crypto.h>
#include "internal/refcount.h"
#include "ssl_locl.h"
#include "ssl_cert_table.h"
#include "internal/thread_once.h"

static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
                                         int op, int bits, int nid, void *other,
                                         void *ex);

static CRYPTO_ONCE ssl_x509_store_ctx_once = CRYPTO_ONCE_STATIC_INIT;
static volatile int ssl_x509_store_ctx_idx = -1;

DEFINE_RUN_ONCE_STATIC(ssl_x509_store_ctx_init)
{
    ssl_x509_store_ctx_idx = X509_STORE_CTX_get_ex_new_index(0,
                                                             "SSL for verify callback",
                                                             NULL, NULL, NULL);
    return ssl_x509_store_ctx_idx >= 0;
}

int SSL_get_ex_data_X509_STORE_CTX_idx(void)
{

    if (!RUN_ONCE(&ssl_x509_store_ctx_once, ssl_x509_store_ctx_init))
        return -1;
    return ssl_x509_store_ctx_idx;
}

CERT *ssl_cert_new(void)
{
    CERT *ret = OPENSSL_zalloc(sizeof(*ret));

    if (ret == NULL) {
        SSLerr(SSL_F_SSL_CERT_NEW, ERR_R_MALLOC_FAILURE);
        return NULL;
    }

    ret->key = &(ret->pkeys[SSL_PKEY_RSA]);
    ret->references = 1;
    ret->sec_cb = ssl_security_default_callback;
    ret->sec_level = OPENSSL_TLS_SECURITY_LEVEL;
    ret->sec_ex = NULL;
    ret->lock = CRYPTO_THREAD_lock_new();
    if (ret->lock == NULL) {
        SSLerr(SSL_F_SSL_CERT_NEW, ERR_R_MALLOC_FAILURE);
        OPENSSL_free(ret);
        return NULL;
    }

    return ret;
}

CERT *ssl_cert_dup(CERT *cert)
{
    CERT *ret = OPENSSL_zalloc(sizeof(*ret));
    int i;

    if (ret == NULL) {
        SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
        return NULL;
    }

    ret->references = 1;
    ret->key = &ret->pkeys[cert->key - cert->pkeys];
    ret->lock = CRYPTO_THREAD_lock_new();
    if (ret->lock == NULL) {
        SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
        OPENSSL_free(ret);
        return NULL;
    }
#ifndef OPENSSL_NO_DH
    if (cert->dh_tmp != NULL) {
        ret->dh_tmp = cert->dh_tmp;
        EVP_PKEY_up_ref(ret->dh_tmp);
    }
    ret->dh_tmp_cb = cert->dh_tmp_cb;
    ret->dh_tmp_auto = cert->dh_tmp_auto;
#endif

    for (i = 0; i < SSL_PKEY_NUM; i++) {
        CERT_PKEY *cpk = cert->pkeys + i;
        CERT_PKEY *rpk = ret->pkeys + i;
        if (cpk->x509 != NULL) {
            rpk->x509 = cpk->x509;
            X509_up_ref(rpk->x509);
        }

        if (cpk->privatekey != NULL) {
            rpk->privatekey = cpk->privatekey;
            EVP_PKEY_up_ref(cpk->privatekey);
        }

        if (cpk->chain) {
            rpk->chain = X509_chain_up_ref(cpk->chain);
            if (!rpk->chain) {
                SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
                goto err;
            }
        }
        if (cert->pkeys[i].serverinfo != NULL) {
            /* Just copy everything. */
            ret->pkeys[i].serverinfo =
                OPENSSL_malloc(cert->pkeys[i].serverinfo_length);
            if (ret->pkeys[i].serverinfo == NULL) {
                SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
                goto err;
            }
            ret->pkeys[i].serverinfo_length = cert->pkeys[i].serverinfo_length;
            memcpy(ret->pkeys[i].serverinfo,
                   cert->pkeys[i].serverinfo, cert->pkeys[i].serverinfo_length);
        }
    }

    /* Configured sigalgs copied across */
    if (cert->conf_sigalgs) {
        ret->conf_sigalgs = OPENSSL_malloc(cert->conf_sigalgslen
                                           * sizeof(*cert->conf_sigalgs));
        if (ret->conf_sigalgs == NULL)
            goto err;
        memcpy(ret->conf_sigalgs, cert->conf_sigalgs,
               cert->conf_sigalgslen * sizeof(*cert->conf_sigalgs));
        ret->conf_sigalgslen = cert->conf_sigalgslen;
    } else
        ret->conf_sigalgs = NULL;

    if (cert->client_sigalgs) {
        ret->client_sigalgs = OPENSSL_malloc(cert->client_sigalgslen
                                             * sizeof(*cert->client_sigalgs));
        if (ret->client_sigalgs == NULL)
            goto err;
        memcpy(ret->client_sigalgs, cert->client_sigalgs,
               cert->client_sigalgslen * sizeof(*cert->client_sigalgs));
        ret->client_sigalgslen = cert->client_sigalgslen;
    } else
        ret->client_sigalgs = NULL;
    /* Shared sigalgs also NULL */
    ret->shared_sigalgs = NULL;
    /* Copy any custom client certificate types */
    if (cert->ctype) {
        ret->ctype = OPENSSL_memdup(cert->ctype, cert->ctype_len);
        if (ret->ctype == NULL)
            goto err;
        ret->ctype_len = cert->ctype_len;
    }

    ret->cert_flags = cert->cert_flags;

    ret->cert_cb = cert->cert_cb;
    ret->cert_cb_arg = cert->cert_cb_arg;

    if (cert->verify_store) {
        X509_STORE_up_ref(cert->verify_store);
        ret->verify_store = cert->verify_store;
    }

    if (cert->chain_store) {
        X509_STORE_up_ref(cert->chain_store);
        ret->chain_store = cert->chain_store;
    }

    ret->sec_cb = cert->sec_cb;
    ret->sec_level = cert->sec_level;
    ret->sec_ex = cert->sec_ex;

    if (!custom_exts_copy(&ret->custext, &cert->custext))
        goto err;
#ifndef OPENSSL_NO_PSK
    if (cert->psk_identity_hint) {
        ret->psk_identity_hint = OPENSSL_strdup(cert->psk_identity_hint);
        if (ret->psk_identity_hint == NULL)
            goto err;
    }
#endif
    return ret;

 err:
    ssl_cert_free(ret);

    return NULL;
}

/* Free up and clear all certificates and chains */

void ssl_cert_clear_certs(CERT *c)
{
    int i;
    if (c == NULL)
        return;
    for (i = 0; i < SSL_PKEY_NUM; i++) {
        CERT_PKEY *cpk = c->pkeys + i;
        X509_free(cpk->x509);
        cpk->x509 = NULL;
        EVP_PKEY_free(cpk->privatekey);
        cpk->privatekey = NULL;
        sk_X509_pop_free(cpk->chain, X509_free);
        cpk->chain = NULL;
        OPENSSL_free(cpk->serverinfo);
        cpk->serverinfo = NULL;
        cpk->serverinfo_length = 0;
    }
}

void ssl_cert_free(CERT *c)
{
    int i;

    if (c == NULL)
        return;
    CRYPTO_DOWN_REF(&c->references, &i, c->lock);
    REF_PRINT_COUNT("CERT", c);
    if (i > 0)
        return;
    REF_ASSERT_ISNT(i < 0);

#ifndef OPENSSL_NO_DH
    EVP_PKEY_free(c->dh_tmp);
#endif

    ssl_cert_clear_certs(c);
    OPENSSL_free(c->conf_sigalgs);
    OPENSSL_free(c->client_sigalgs);
    OPENSSL_free(c->shared_sigalgs);
    OPENSSL_free(c->ctype);
    X509_STORE_free(c->verify_store);
    X509_STORE_free(c->chain_store);
    custom_exts_free(&c->custext);
#ifndef OPENSSL_NO_PSK
    OPENSSL_free(c->psk_identity_hint);
#endif
    CRYPTO_THREAD_lock_free(c->lock);
    OPENSSL_free(c);
}

int ssl_cert_set0_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
{
    int i, r;
    CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
    if (!cpk)
        return 0;
    for (i = 0; i < sk_X509_num(chain); i++) {
        r = ssl_security_cert(s, ctx, sk_X509_value(chain, i), 0, 0);
        if (r != 1) {
            SSLerr(SSL_F_SSL_CERT_SET0_CHAIN, r);
            return 0;
        }
    }
    sk_X509_pop_free(cpk->chain, X509_free);
    cpk->chain = chain;
    return 1;
}

int ssl_cert_set1_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
{
    STACK_OF(X509) *dchain;
    if (!chain)
        return ssl_cert_set0_chain(s, ctx, NULL);
    dchain = X509_chain_up_ref(chain);
    if (!dchain)
        return 0;
    if (!ssl_cert_set0_chain(s, ctx, dchain)) {
        sk_X509_pop_free(dchain, X509_free);
        return 0;
    }
    return 1;
}

int ssl_cert_add0_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
{
    int r;
    CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
    if (!cpk)
        return 0;
    r = ssl_security_cert(s, ctx, x, 0, 0);
    if (r != 1) {
        SSLerr(SSL_F_SSL_CERT_ADD0_CHAIN_CERT, r);
        return 0;
    }
    if (!cpk->chain)
        cpk->chain = sk_X509_new_null();
    if (!cpk->chain || !sk_X509_push(cpk->chain, x))
        return 0;
    return 1;
}

int ssl_cert_add1_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
{
    if (!ssl_cert_add0_chain_cert(s, ctx, x))
        return 0;
    X509_up_ref(x);
    return 1;
}

int ssl_cert_select_current(CERT *c, X509 *x)
{
    int i;
    if (x == NULL)
        return 0;
    for (i = 0; i < SSL_PKEY_NUM; i++) {
        CERT_PKEY *cpk = c->pkeys + i;
        if (cpk->x509 == x && cpk->privatekey) {
            c->key = cpk;
            return 1;
        }
    }

    for (i = 0; i < SSL_PKEY_NUM; i++) {
        CERT_PKEY *cpk = c->pkeys + i;
        if (cpk->privatekey && cpk->x509 && !X509_cmp(cpk->x509, x)) {
            c->key = cpk;
            return 1;
        }
    }
    return 0;
}

int ssl_cert_set_current(CERT *c, long op)
{
    int i, idx;
    if (!c)
        return 0;
    if (op == SSL_CERT_SET_FIRST)
        idx = 0;
    else if (op == SSL_CERT_SET_NEXT) {
        idx = (int)(c->key - c->pkeys + 1);
        if (idx >= SSL_PKEY_NUM)
            return 0;
    } else
        return 0;
    for (i = idx; i < SSL_PKEY_NUM; i++) {
        CERT_PKEY *cpk = c->pkeys + i;
        if (cpk->x509 && cpk->privatekey) {
            c->key = cpk;
            return 1;
        }
    }
    return 0;
}

void ssl_cert_set_cert_cb(CERT *c, int (*cb) (SSL *ssl, void *arg), void *arg)
{
    c->cert_cb = cb;
    c->cert_cb_arg = arg;
}

int ssl_verify_cert_chain(SSL *s, STACK_OF(X509) *sk)
{
    X509 *x;
    int i = 0;
    X509_STORE *verify_store;
    X509_STORE_CTX *ctx = NULL;
    X509_VERIFY_PARAM *param;

    if ((sk == NULL) || (sk_X509_num(sk) == 0))
        return 0;

    if (s->cert->verify_store)
        verify_store = s->cert->verify_store;
    else
        verify_store = s->ctx->cert_store;

    ctx = X509_STORE_CTX_new();
    if (ctx == NULL) {
        SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
        return 0;
    }

    x = sk_X509_value(sk, 0);
    if (!X509_STORE_CTX_init(ctx, verify_store, x, sk)) {
        SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_X509_LIB);
        goto end;
    }
    param = X509_STORE_CTX_get0_param(ctx);
    /*
     * XXX: Separate @AUTHSECLEVEL and @TLSSECLEVEL would be useful at some
     * point, for now a single @SECLEVEL sets the same policy for TLS crypto
     * and PKI authentication.
     */
    X509_VERIFY_PARAM_set_auth_level(param, SSL_get_security_level(s));

    /* Set suite B flags if needed */
    X509_STORE_CTX_set_flags(ctx, tls1_suiteb(s));
    if (!X509_STORE_CTX_set_ex_data
        (ctx, SSL_get_ex_data_X509_STORE_CTX_idx(), s)) {
        goto end;
    }

    /* Verify via DANE if enabled */
    if (DANETLS_ENABLED(&s->dane))
        X509_STORE_CTX_set0_dane(ctx, &s->dane);

    /*
     * We need to inherit the verify parameters. These can be determined by
     * the context: if its a server it will verify SSL client certificates or
     * vice versa.
     */

    X509_STORE_CTX_set_default(ctx, s->server ? "ssl_client" : "ssl_server");
    /*
     * Anything non-default in "s->param" should overwrite anything in the ctx.
     */
    X509_VERIFY_PARAM_set1(param, s->param);

    if (s->verify_callback)
        X509_STORE_CTX_set_verify_cb(ctx, s->verify_callback);

    if (s->ctx->app_verify_callback != NULL)
        i = s->ctx->app_verify_callback(ctx, s->ctx->app_verify_arg);
    else
        i = X509_verify_cert(ctx);

    s->verify_result = X509_STORE_CTX_get_error(ctx);
    sk_X509_pop_free(s->verified_chain, X509_free);
    s->verified_chain = NULL;
    if (X509_STORE_CTX_get0_chain(ctx) != NULL) {
        s->verified_chain = X509_STORE_CTX_get1_chain(ctx);
        if (s->verified_chain == NULL) {
            SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
            i = 0;
        }
    }

    /* Move peername from the store context params to the SSL handle's */
    X509_VERIFY_PARAM_move_peername(s->param, param);

 end:
    X509_STORE_CTX_free(ctx);
    return i;
}

static void set0_CA_list(STACK_OF(X509_NAME) **ca_list,
                        STACK_OF(X509_NAME) *name_list)
{
    sk_X509_NAME_pop_free(*ca_list, X509_NAME_free);
    *ca_list = name_list;
}

STACK_OF(X509_NAME) *SSL_dup_CA_list(const STACK_OF(X509_NAME) *sk)
{
    int i;
    const int num = sk_X509_NAME_num(sk);
    STACK_OF(X509_NAME) *ret;
    X509_NAME *name;

    ret = sk_X509_NAME_new_reserve(NULL, num);
    if (ret == NULL) {
        SSLerr(SSL_F_SSL_DUP_CA_LIST, ERR_R_MALLOC_FAILURE);
        return NULL;
    }
    for (i = 0; i < num; i++) {
        name = X509_NAME_dup(sk_X509_NAME_value(sk, i));
        if (name == NULL) {
            SSLerr(SSL_F_SSL_DUP_CA_LIST, ERR_R_MALLOC_FAILURE);
            sk_X509_NAME_pop_free(ret, X509_NAME_free);
            return NULL;
        }
        sk_X509_NAME_push(ret, name);   /* Cannot fail after reserve call */
    }
    return ret;
}

void SSL_set0_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
{
    set0_CA_list(&s->ca_names, name_list);
}

void SSL_CTX_set0_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
{
    set0_CA_list(&ctx->ca_names, name_list);
}

const STACK_OF(X509_NAME) *SSL_CTX_get0_CA_list(const SSL_CTX *ctx)
{
    return ctx->ca_names;
}

const STACK_OF(X509_NAME) *SSL_get0_CA_list(const SSL *s)
{
    return s->ca_names != NULL ? s->ca_names : s->ctx->ca_names;
}

void SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
{
    SSL_CTX_set0_CA_list(ctx, name_list);
}

STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx)
{
    return ctx->ca_names;
}

void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
{
    SSL_set0_CA_list(s, name_list);
}

const STACK_OF(X509_NAME) *SSL_get0_peer_CA_list(const SSL *s)
{
    return s->s3 != NULL ? s->s3->tmp.peer_ca_names : NULL;
}

STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s)
{
    if (!s->server)
        return s->s3 != NULL ?  s->s3->tmp.peer_ca_names : NULL;
    return s->ca_names != NULL ?  s->ca_names : s->ctx->ca_names;
}

static int add_ca_name(STACK_OF(X509_NAME) **sk, const X509 *x)
{
    X509_NAME *name;

    if (x == NULL)
        return 0;
    if (*sk == NULL && ((*sk = sk_X509_NAME_new_null()) == NULL))
        return 0;

    if ((name = X509_NAME_dup(X509_get_subject_name(x))) == NULL)
        return 0;

    if (!sk_X509_NAME_push(*sk, name)) {
        X509_NAME_free(name);
        return 0;
    }
    return 1;
}

int SSL_add1_to_CA_list(SSL *ssl, const X509 *x)
{
    return add_ca_name(&ssl->ca_names, x);
}

int SSL_CTX_add1_to_CA_list(SSL_CTX *ctx, const X509 *x)
{
    return add_ca_name(&ctx->ca_names, x);
}

/*
 * The following two are older names are to be replaced with
 * SSL(_CTX)_add1_to_CA_list
 */
int SSL_add_client_CA(SSL *ssl, X509 *x)
{
    return add_ca_name(&ssl->ca_names, x);
}

int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x)
{
    return add_ca_name(&ctx->ca_names, x);
}

static int xname_cmp(const X509_NAME *a, const X509_NAME *b)
{
    unsigned char *abuf = NULL, *bbuf = NULL;
    int alen, blen, ret;

    /* X509_NAME_cmp() itself casts away constness in this way, so
     * assume it's safe:
     */
    alen = i2d_X509_NAME((X509_NAME *)a, &abuf);
    blen = i2d_X509_NAME((X509_NAME *)b, &bbuf);

    if (alen < 0 || blen < 0)
        ret = -2;
    else if (alen != blen)
        ret = alen - blen;
    else /* alen == blen */
        ret = memcmp(abuf, bbuf, alen);

    OPENSSL_free(abuf);
    OPENSSL_free(bbuf);

    return ret;
}

static int xname_sk_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
{
    return xname_cmp(*a, *b);
}

static unsigned long xname_hash(const X509_NAME *a)
{
    return X509_NAME_hash((X509_NAME *)a);
}

/**
 * Load CA certs from a file into a ::STACK. Note that it is somewhat misnamed;
 * it doesn't really have anything to do with clients (except that a common use
 * for a stack of CAs is to send it to the client). Actually, it doesn't have
 * much to do with CAs, either, since it will load any old cert.
 * \param file the file containing one or more certs.
 * \return a ::STACK containing the certs.
 */
STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file)
{
    BIO *in = BIO_new(BIO_s_file());
    X509 *x = NULL;
    X509_NAME *xn = NULL;
    STACK_OF(X509_NAME) *ret = NULL;
    LHASH_OF(X509_NAME) *name_hash = lh_X509_NAME_new(xname_hash, xname_cmp);

    if ((name_hash == NULL) || (in == NULL)) {
        SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE);
        goto err;
    }

    if (!BIO_read_filename(in, file))
        goto err;

    for (;;) {
        if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
            break;
        if (ret == NULL) {
            ret = sk_X509_NAME_new_null();
            if (ret == NULL) {
                SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE);
                goto err;
            }
        }
        if ((xn = X509_get_subject_name(x)) == NULL)
            goto err;
        /* check for duplicates */
        xn = X509_NAME_dup(xn);
        if (xn == NULL)
            goto err;
        if (lh_X509_NAME_retrieve(name_hash, xn) != NULL) {
            /* Duplicate. */
            X509_NAME_free(xn);
            xn = NULL;
        } else {
            lh_X509_NAME_insert(name_hash, xn);
            if (!sk_X509_NAME_push(ret, xn))
                goto err;
        }
    }
    goto done;

 err:
    X509_NAME_free(xn);
    sk_X509_NAME_pop_free(ret, X509_NAME_free);
    ret = NULL;
 done:
    BIO_free(in);
    X509_free(x);
    lh_X509_NAME_free(name_hash);
    if (ret != NULL)
        ERR_clear_error();
    return ret;
}

/**
 * Add a file of certs to a stack.
 * \param stack the stack to add to.
 * \param file the file to add from. All certs in this file that are not
 * already in the stack will be added.
 * \return 1 for success, 0 for failure. Note that in the case of failure some
 * certs may have been added to \c stack.
 */

int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
                                        const char *file)
{
    BIO *in;
    X509 *x = NULL;
    X509_NAME *xn = NULL;
    int ret = 1;
    int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b);

    oldcmp = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);

    in = BIO_new(BIO_s_file());

    if (in == NULL) {
        SSLerr(SSL_F_SSL_ADD_FILE_CERT_SUBJECTS_TO_STACK, ERR_R_MALLOC_FAILURE);
        goto err;
    }

    if (!BIO_read_filename(in, file))
        goto err;

    for (;;) {
        if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
            break;
        if ((xn = X509_get_subject_name(x)) == NULL)
            goto err;
        xn = X509_NAME_dup(xn);
        if (xn == NULL)
            goto err;
        if (sk_X509_NAME_find(stack, xn) >= 0) {
            /* Duplicate. */
            X509_NAME_free(xn);
        } else if (!sk_X509_NAME_push(stack, xn)) {
            X509_NAME_free(xn);
            goto err;
        }
    }

    ERR_clear_error();
    goto done;

 err:
    ret = 0;
 done:
    BIO_free(in);
    X509_free(x);
    (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
    return ret;
}

/**
 * Add a directory of certs to a stack.
 * \param stack the stack to append to.
 * \param dir the directory to append from. All files in this directory will be
 * examined as potential certs. Any that are acceptable to
 * SSL_add_dir_cert_subjects_to_stack() that are not already in the stack will be
 * included.
 * \return 1 for success, 0 for failure. Note that in the case of failure some
 * certs may have been added to \c stack.
 */

int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
                                       const char *dir)
{
    OPENSSL_DIR_CTX *d = NULL;
    const char *filename;
    int ret = 0;

    /* Note that a side effect is that the CAs will be sorted by name */

    while ((filename = OPENSSL_DIR_read(&d, dir))) {
        char buf[1024];
        int r;

        if (strlen(dir) + strlen(filename) + 2 > sizeof(buf)) {
            SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK,
                   SSL_R_PATH_TOO_LONG);
            goto err;
        }
#ifdef OPENSSL_SYS_VMS
        r = BIO_snprintf(buf, sizeof(buf), "%s%s", dir, filename);
#else
        r = BIO_snprintf(buf, sizeof(buf), "%s/%s", dir, filename);
#endif
        if (r <= 0 || r >= (int)sizeof(buf))
            goto err;
        if (!SSL_add_file_cert_subjects_to_stack(stack, buf))
            goto err;
    }

    if (errno) {
        SYSerr(SYS_F_OPENDIR, get_last_sys_error());
        ERR_add_error_data(3, "OPENSSL_DIR_read(&ctx, '", dir, "')");
        SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK, ERR_R_SYS_LIB);
        goto err;
    }

    ret = 1;

 err:
    if (d)
        OPENSSL_DIR_end(&d);

    return ret;
}

/* Build a certificate chain for current certificate */
int ssl_build_cert_chain(SSL *s, SSL_CTX *ctx, int flags)
{
    CERT *c = s ? s->cert : ctx->cert;
    CERT_PKEY *cpk = c->key;
    X509_STORE *chain_store = NULL;
    X509_STORE_CTX *xs_ctx = NULL;
    STACK_OF(X509) *chain = NULL, *untrusted = NULL;
    X509 *x;
    int i, rv = 0;

    if (!cpk->x509) {
        SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_NO_CERTIFICATE_SET);
        goto err;
    }
    /* Rearranging and check the chain: add everything to a store */
    if (flags & SSL_BUILD_CHAIN_FLAG_CHECK) {
        chain_store = X509_STORE_new();
        if (chain_store == NULL)
            goto err;
        for (i = 0; i < sk_X509_num(cpk->chain); i++) {
            x = sk_X509_value(cpk->chain, i);
            if (!X509_STORE_add_cert(chain_store, x))
                goto err;
        }
        /* Add EE cert too: it might be self signed */
        if (!X509_STORE_add_cert(chain_store, cpk->x509))
            goto err;
    } else {
        if (c->chain_store)
            chain_store = c->chain_store;
        else if (s)
            chain_store = s->ctx->cert_store;
        else
            chain_store = ctx->cert_store;

        if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED)
            untrusted = cpk->chain;
    }

    xs_ctx = X509_STORE_CTX_new();
    if (xs_ctx == NULL) {
        SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
        goto err;
    }
    if (!X509_STORE_CTX_init(xs_ctx, chain_store, cpk->x509, untrusted)) {
        SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_X509_LIB);
        goto err;
    }
    /* Set suite B flags if needed */
    X509_STORE_CTX_set_flags(xs_ctx,
                             c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS);

    i = X509_verify_cert(xs_ctx);
    if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR) {
        if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR)
            ERR_clear_error();
        i = 1;
        rv = 2;
    }
    if (i > 0)
        chain = X509_STORE_CTX_get1_chain(xs_ctx);
    if (i <= 0) {
        SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_CERTIFICATE_VERIFY_FAILED);
        i = X509_STORE_CTX_get_error(xs_ctx);
        ERR_add_error_data(2, "Verify error:",
                           X509_verify_cert_error_string(i));

        goto err;
    }
    /* Remove EE certificate from chain */
    x = sk_X509_shift(chain);
    X509_free(x);
    if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT) {
        if (sk_X509_num(chain) > 0) {
            /* See if last cert is self signed */
            x = sk_X509_value(chain, sk_X509_num(chain) - 1);
            if (X509_get_extension_flags(x) & EXFLAG_SS) {
                x = sk_X509_pop(chain);
                X509_free(x);
            }
        }
    }
    /*
     * Check security level of all CA certificates: EE will have been checked
     * already.
     */
    for (i = 0; i < sk_X509_num(chain); i++) {
        x = sk_X509_value(chain, i);
        rv = ssl_security_cert(s, ctx, x, 0, 0);
        if (rv != 1) {
            SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, rv);
            sk_X509_pop_free(chain, X509_free);
            rv = 0;
            goto err;
        }
    }
    sk_X509_pop_free(cpk->chain, X509_free);
    cpk->chain = chain;
    if (rv == 0)
        rv = 1;
 err:
    if (flags & SSL_BUILD_CHAIN_FLAG_CHECK)
        X509_STORE_free(chain_store);
    X509_STORE_CTX_free(xs_ctx);

    return rv;
}

int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref)
{
    X509_STORE **pstore;
    if (chain)
        pstore = &c->chain_store;
    else
        pstore = &c->verify_store;
    X509_STORE_free(*pstore);
    *pstore = store;
    if (ref && store)
        X509_STORE_up_ref(store);
    return 1;
}

static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
                                         int op, int bits, int nid, void *other,
                                         void *ex)
{
    int level, minbits;
    static const int minbits_table[5] = { 80, 112, 128, 192, 256 };
    if (ctx)
        level = SSL_CTX_get_security_level(ctx);
    else
        level = SSL_get_security_level(s);

    if (level <= 0) {
        /*
         * No EDH keys weaker than 1024-bits even at level 0, otherwise,
         * anything goes.
         */
        if (op == SSL_SECOP_TMP_DH && bits < 80)
            return 0;
        return 1;
    }
    if (level > 5)
        level = 5;
    minbits = minbits_table[level - 1];
    switch (op) {
    case SSL_SECOP_CIPHER_SUPPORTED:
    case SSL_SECOP_CIPHER_SHARED:
    case SSL_SECOP_CIPHER_CHECK:
        {
            const SSL_CIPHER *c = other;
            /* No ciphers below security level */
            if (bits < minbits)
                return 0;
            /* No unauthenticated ciphersuites */
            if (c->algorithm_auth & SSL_aNULL)
                return 0;
            /* No MD5 mac ciphersuites */
            if (c->algorithm_mac & SSL_MD5)
                return 0;
            /* SHA1 HMAC is 160 bits of security */
            if (minbits > 160 && c->algorithm_mac & SSL_SHA1)
                return 0;
            /* Level 2: no RC4 */
            if (level >= 2 && c->algorithm_enc == SSL_RC4)
                return 0;
            /* Level 3: forward secure ciphersuites only */
            if (level >= 3 && (c->min_tls != TLS1_3_VERSION ||
                               !(c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH))))
                return 0;
            break;
        }
    case SSL_SECOP_VERSION:
        if (!SSL_IS_DTLS(s)) {
            /* SSLv3 not allowed at level 2 */
            if (nid <= SSL3_VERSION && level >= 2)
                return 0;
            /* TLS v1.1 and above only for level 3 */
            if (nid <= TLS1_VERSION && level >= 3)
                return 0;
            /* TLS v1.2 only for level 4 and above */
            if (nid <= TLS1_1_VERSION && level >= 4)
                return 0;
        } else {
            /* DTLS v1.2 only for level 4 and above */
            if (DTLS_VERSION_LT(nid, DTLS1_2_VERSION) && level >= 4)
                return 0;
        }
        break;

    case SSL_SECOP_COMPRESSION:
        if (level >= 2)
            return 0;
        break;
    case SSL_SECOP_TICKET:
        if (level >= 3)
            return 0;
        break;
    default:
        if (bits < minbits)
            return 0;
    }
    return 1;
}

int ssl_security(const SSL *s, int op, int bits, int nid, void *other)
{
    return s->cert->sec_cb(s, NULL, op, bits, nid, other, s->cert->sec_ex);
}

int ssl_ctx_security(const SSL_CTX *ctx, int op, int bits, int nid, void *other)
{
    return ctx->cert->sec_cb(NULL, ctx, op, bits, nid, other,
                             ctx->cert->sec_ex);
}

int ssl_cert_lookup_by_nid(int nid, size_t *pidx)
{
    size_t i;

    for (i = 0; i < OSSL_NELEM(ssl_cert_info); i++) {
        if (ssl_cert_info[i].nid == nid) {
            *pidx = i;
            return 1;
        }
    }

    return 0;
}

const SSL_CERT_LOOKUP *ssl_cert_lookup_by_pkey(const EVP_PKEY *pk, size_t *pidx)
{
    int nid = EVP_PKEY_id(pk);
    size_t tmpidx;

    if (nid == NID_undef)
        return NULL;

    if (!ssl_cert_lookup_by_nid(nid, &tmpidx))
        return NULL;

    if (pidx != NULL)
        *pidx = tmpidx;

    return &ssl_cert_info[tmpidx];
}

const SSL_CERT_LOOKUP *ssl_cert_lookup_by_idx(size_t idx)
{
    if (idx >= OSSL_NELEM(ssl_cert_info))
        return NULL;
    return &ssl_cert_info[idx];
}