crypto/libressl/crypto/x509/x509_lu.c

   1 /* $OpenBSD: x509_lu.c,v 1.19 2015/02/10 11:22:21 jsing Exp $ */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60
  61 #include <openssl/err.h>
  62 #include <openssl/lhash.h>
  63 #include <openssl/x509.h>
  64 #include <openssl/x509v3.h>
  65 #include "x509_lcl.h"
  66
  67 X509_LOOKUP *
  68 X509_LOOKUP_new(X509_LOOKUP_METHOD *method)
  69 {
  70         X509_LOOKUP *ret;
  71
  72         ret = malloc(sizeof(X509_LOOKUP));
  73         if (ret == NULL)
  74                 return NULL;
  75
  76         ret->init = 0;
  77         ret->skip = 0;
  78         ret->method = method;
  79         ret->method_data = NULL;
  80         ret->store_ctx = NULL;
  81         if ((method->new_item != NULL) && !method->new_item(ret)) {
  82                 free(ret);
  83                 return NULL;
  84         }
  85         return ret;
  86 }
  87
  88 void
  89 X509_LOOKUP_free(X509_LOOKUP *ctx)
  90 {
  91         if (ctx == NULL)
  92                 return;
  93         if ((ctx->method != NULL) && (ctx->method->free != NULL))
  94                 (*ctx->method->free)(ctx);
  95         free(ctx);
  96 }
  97
  98 int
  99 X509_LOOKUP_init(X509_LOOKUP *ctx)
 100 {
 101         if (ctx->method == NULL)
 102                 return 0;
 103         if (ctx->method->init != NULL)
 104                 return ctx->method->init(ctx);
 105         else
 106                 return 1;
 107 }
 108
 109 int
 110 X509_LOOKUP_shutdown(X509_LOOKUP *ctx)
 111 {
 112         if (ctx->method == NULL)
 113                 return 0;
 114         if (ctx->method->shutdown != NULL)
 115                 return ctx->method->shutdown(ctx);
 116         else
 117                 return 1;
 118 }
 119
 120 int
 121 X509_LOOKUP_ctrl(X509_LOOKUP *ctx, int cmd, const char *argc, long argl,
 122     char **ret)
 123 {
 124         if (ctx->method == NULL)
 125                 return -1;
 126         if (ctx->method->ctrl != NULL)
 127                 return ctx->method->ctrl(ctx, cmd, argc, argl, ret);
 128         else
 129                 return 1;
 130 }
 131
 132 int
 133 X509_LOOKUP_by_subject(X509_LOOKUP *ctx, int type, X509_NAME *name,
 134     X509_OBJECT *ret)
 135 {
 136         if ((ctx->method == NULL) || (ctx->method->get_by_subject == NULL))
 137                 return X509_LU_FAIL;
 138         if (ctx->skip)
 139                 return 0;
 140         return ctx->method->get_by_subject(ctx, type, name, ret);
 141 }
 142
 143 int
 144 X509_LOOKUP_by_issuer_serial(X509_LOOKUP *ctx, int type, X509_NAME *name,
 145     ASN1_INTEGER *serial, X509_OBJECT *ret)
 146 {
 147         if ((ctx->method == NULL) ||
 148             (ctx->method->get_by_issuer_serial == NULL))
 149                 return X509_LU_FAIL;
 150         return ctx->method->get_by_issuer_serial(ctx, type, name, serial, ret);
 151 }
 152
 153 int
 154 X509_LOOKUP_by_fingerprint(X509_LOOKUP *ctx, int type, unsigned char *bytes,
 155     int len, X509_OBJECT *ret)
 156 {
 157         if ((ctx->method == NULL) || (ctx->method->get_by_fingerprint == NULL))
 158                 return X509_LU_FAIL;
 159         return ctx->method->get_by_fingerprint(ctx, type, bytes, len, ret);
 160 }
 161
 162 int
 163 X509_LOOKUP_by_alias(X509_LOOKUP *ctx, int type, char *str, int len,
 164     X509_OBJECT *ret)
 165 {
 166         if ((ctx->method == NULL) || (ctx->method->get_by_alias == NULL))
 167                 return X509_LU_FAIL;
 168         return ctx->method->get_by_alias(ctx, type, str, len, ret);
 169 }
 170
 171 static int
 172 x509_object_cmp(const X509_OBJECT * const *a, const X509_OBJECT * const *b)
 173 {
 174         int ret;
 175
 176         ret = ((*a)->type - (*b)->type);
 177         if (ret)
 178                 return ret;
 179         switch ((*a)->type) {
 180         case X509_LU_X509:
 181                 ret = X509_subject_name_cmp((*a)->data.x509, (*b)->data.x509);
 182                 break;
 183         case X509_LU_CRL:
 184                 ret = X509_CRL_cmp((*a)->data.crl, (*b)->data.crl);
 185                 break;
 186         default:
 187                 /* abort(); */
 188                 return 0;
 189         }
 190         return ret;
 191 }
 192
 193 X509_STORE *
 194 X509_STORE_new(void)
 195 {
 196         X509_STORE *ret;
 197
 198         if ((ret = malloc(sizeof(X509_STORE))) == NULL)
 199                 return NULL;
 200         ret->objs = sk_X509_OBJECT_new(x509_object_cmp);
 201         ret->cache = 1;
 202         ret->get_cert_methods = sk_X509_LOOKUP_new_null();
 203         ret->verify = 0;
 204         ret->verify_cb = 0;
 205
 206         if ((ret->param = X509_VERIFY_PARAM_new()) == NULL)
 207                 goto err;
 208
 209         ret->get_issuer = 0;
 210         ret->check_issued = 0;
 211         ret->check_revocation = 0;
 212         ret->get_crl = 0;
 213         ret->check_crl = 0;
 214         ret->cert_crl = 0;
 215         ret->lookup_certs = 0;
 216         ret->lookup_crls = 0;
 217         ret->cleanup = 0;
 218
 219         if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE, ret, &ret->ex_data))
 220                 goto err;
 221
 222         ret->references = 1;
 223         return ret;
 224
 225 err:
 226         X509_VERIFY_PARAM_free(ret->param);
 227         sk_X509_LOOKUP_free(ret->get_cert_methods);
 228         sk_X509_OBJECT_free(ret->objs);
 229         free(ret);
 230         return NULL;
 231 }
 232
 233 static void
 234 cleanup(X509_OBJECT *a)
 235 {
 236         if (a->type == X509_LU_X509) {
 237                 X509_free(a->data.x509);
 238         } else if (a->type == X509_LU_CRL) {
 239                 X509_CRL_free(a->data.crl);
 240         } else {
 241                 /* abort(); */
 242         }
 243
 244         free(a);
 245 }
 246
 247 void
 248 X509_STORE_free(X509_STORE *vfy)
 249 {
 250         int i;
 251         STACK_OF(X509_LOOKUP) *sk;
 252         X509_LOOKUP *lu;
 253
 254         if (vfy == NULL)
 255                 return;
 256
 257         i = CRYPTO_add(&vfy->references, -1, CRYPTO_LOCK_X509_STORE);
 258         if (i > 0)
 259                 return;
 260
 261         sk = vfy->get_cert_methods;
 262         for (i = 0; i < sk_X509_LOOKUP_num(sk); i++) {
 263                 lu = sk_X509_LOOKUP_value(sk, i);
 264                 X509_LOOKUP_shutdown(lu);
 265                 X509_LOOKUP_free(lu);
 266         }
 267         sk_X509_LOOKUP_free(sk);
 268         sk_X509_OBJECT_pop_free(vfy->objs, cleanup);
 269
 270         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE, vfy, &vfy->ex_data);
 271         X509_VERIFY_PARAM_free(vfy->param);
 272         free(vfy);
 273 }
 274
 275 X509_LOOKUP *
 276 X509_STORE_add_lookup(X509_STORE *v, X509_LOOKUP_METHOD *m)
 277 {
 278         int i;
 279         STACK_OF(X509_LOOKUP) *sk;
 280         X509_LOOKUP *lu;
 281
 282         sk = v->get_cert_methods;
 283         for (i = 0; i < sk_X509_LOOKUP_num(sk); i++) {
 284                 lu = sk_X509_LOOKUP_value(sk, i);
 285                 if (m == lu->method) {
 286                         return lu;
 287                 }
 288         }
 289         /* a new one */
 290         lu = X509_LOOKUP_new(m);
 291         if (lu == NULL)
 292                 return NULL;
 293         else {
 294                 lu->store_ctx = v;
 295                 if (sk_X509_LOOKUP_push(v->get_cert_methods, lu))
 296                         return lu;
 297                 else {
 298                         X509_LOOKUP_free(lu);
 299                         return NULL;
 300                 }
 301         }
 302 }
 303
 304 int
 305 X509_STORE_get_by_subject(X509_STORE_CTX *vs, int type, X509_NAME *name,
 306     X509_OBJECT *ret)
 307 {
 308         X509_STORE *ctx = vs->ctx;
 309         X509_LOOKUP *lu;
 310         X509_OBJECT stmp, *tmp;
 311         int i, j;
 312
 313         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 314         tmp = X509_OBJECT_retrieve_by_subject(ctx->objs, type, name);
 315         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 316
 317         if (tmp == NULL || type == X509_LU_CRL) {
 318                 for (i = vs->current_method;
 319                     i < sk_X509_LOOKUP_num(ctx->get_cert_methods); i++) {
 320                         lu = sk_X509_LOOKUP_value(ctx->get_cert_methods, i);
 321                         j = X509_LOOKUP_by_subject(lu, type, name, &stmp);
 322                         if (j < 0) {
 323                                 vs->current_method = j;
 324                                 return j;
 325                         } else if (j) {
 326                                 tmp = &stmp;
 327                                 break;
 328                         }
 329                 }
 330                 vs->current_method = 0;
 331                 if (tmp == NULL)
 332                         return 0;
 333         }
 334
 335 /*      if (ret->data.ptr != NULL)
 336                 X509_OBJECT_free_contents(ret); */
 337
 338         ret->type = tmp->type;
 339         ret->data.ptr = tmp->data.ptr;
 340
 341         X509_OBJECT_up_ref_count(ret);
 342
 343         return 1;
 344 }
 345
 346 int
 347 X509_STORE_add_cert(X509_STORE *ctx, X509 *x)
 348 {
 349         X509_OBJECT *obj;
 350         int ret = 1;
 351
 352         if (x == NULL)
 353                 return 0;
 354         obj = malloc(sizeof(X509_OBJECT));
 355         if (obj == NULL) {
 356                 X509err(X509_F_X509_STORE_ADD_CERT, ERR_R_MALLOC_FAILURE);
 357                 return 0;
 358         }
 359         obj->type = X509_LU_X509;
 360         obj->data.x509 = x;
 361
 362         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 363
 364         X509_OBJECT_up_ref_count(obj);
 365
 366         if (X509_OBJECT_retrieve_match(ctx->objs, obj)) {
 367                 X509_OBJECT_free_contents(obj);
 368                 free(obj);
 369                 X509err(X509_F_X509_STORE_ADD_CERT,
 370                     X509_R_CERT_ALREADY_IN_HASH_TABLE);
 371                 ret = 0;
 372         } else
 373                 sk_X509_OBJECT_push(ctx->objs, obj);
 374
 375         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 376
 377         return ret;
 378 }
 379
 380 int
 381 X509_STORE_add_crl(X509_STORE *ctx, X509_CRL *x)
 382 {
 383         X509_OBJECT *obj;
 384         int ret = 1;
 385
 386         if (x == NULL)
 387                 return 0;
 388         obj = malloc(sizeof(X509_OBJECT));
 389         if (obj == NULL) {
 390                 X509err(X509_F_X509_STORE_ADD_CRL, ERR_R_MALLOC_FAILURE);
 391                 return 0;
 392         }
 393         obj->type = X509_LU_CRL;
 394         obj->data.crl = x;
 395
 396         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 397
 398         X509_OBJECT_up_ref_count(obj);
 399
 400         if (X509_OBJECT_retrieve_match(ctx->objs, obj)) {
 401                 X509_OBJECT_free_contents(obj);
 402                 free(obj);
 403                 X509err(X509_F_X509_STORE_ADD_CRL,
 404                     X509_R_CERT_ALREADY_IN_HASH_TABLE);
 405                 ret = 0;
 406         } else
 407                 sk_X509_OBJECT_push(ctx->objs, obj);
 408
 409         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 410
 411         return ret;
 412 }
 413
 414 void
 415 X509_OBJECT_up_ref_count(X509_OBJECT *a)
 416 {
 417         switch (a->type) {
 418         case X509_LU_X509:
 419                 CRYPTO_add(&a->data.x509->references, 1, CRYPTO_LOCK_X509);
 420                 break;
 421         case X509_LU_CRL:
 422                 CRYPTO_add(&a->data.crl->references, 1, CRYPTO_LOCK_X509_CRL);
 423                 break;
 424         }
 425 }
 426
 427 void
 428 X509_OBJECT_free_contents(X509_OBJECT *a)
 429 {
 430         switch (a->type) {
 431         case X509_LU_X509:
 432                 X509_free(a->data.x509);
 433                 break;
 434         case X509_LU_CRL:
 435                 X509_CRL_free(a->data.crl);
 436                 break;
 437         }
 438 }
 439
 440 static int
 441 x509_object_idx_cnt(STACK_OF(X509_OBJECT) *h, int type, X509_NAME *name,
 442     int *pnmatch)
 443 {
 444         X509_OBJECT stmp;
 445         X509 x509_s;
 446         X509_CINF cinf_s;
 447         X509_CRL crl_s;
 448         X509_CRL_INFO crl_info_s;
 449         int idx;
 450
 451         stmp.type = type;
 452         switch (type) {
 453         case X509_LU_X509:
 454                 stmp.data.x509 = &x509_s;
 455                 x509_s.cert_info = &cinf_s;
 456                 cinf_s.subject = name;
 457                 break;
 458         case X509_LU_CRL:
 459                 stmp.data.crl = &crl_s;
 460                 crl_s.crl = &crl_info_s;
 461                 crl_info_s.issuer = name;
 462                 break;
 463         default:
 464                 /* abort(); */
 465                 return -1;
 466         }
 467
 468         idx = sk_X509_OBJECT_find(h, &stmp);
 469         if (idx >= 0 && pnmatch) {
 470                 int tidx;
 471                 const X509_OBJECT *tobj, *pstmp;
 472                 *pnmatch = 1;
 473                 pstmp = &stmp;
 474                 for (tidx = idx + 1; tidx < sk_X509_OBJECT_num(h); tidx++) {
 475                         tobj = sk_X509_OBJECT_value(h, tidx);
 476                         if (x509_object_cmp(&tobj, &pstmp))
 477                                 break;
 478                         (*pnmatch)++;
 479                 }
 480         }
 481         return idx;
 482 }
 483
 484 int
 485 X509_OBJECT_idx_by_subject(STACK_OF(X509_OBJECT) *h, int type, X509_NAME *name)
 486 {
 487         return x509_object_idx_cnt(h, type, name, NULL);
 488 }
 489
 490 X509_OBJECT *
 491 X509_OBJECT_retrieve_by_subject(STACK_OF(X509_OBJECT) *h, int type,
 492     X509_NAME *name)
 493 {
 494         int idx;
 495
 496         idx = X509_OBJECT_idx_by_subject(h, type, name);
 497         if (idx == -1)
 498                 return NULL;
 499         return sk_X509_OBJECT_value(h, idx);
 500 }
 501
 502 STACK_OF(X509) *
 503 X509_STORE_get1_certs(X509_STORE_CTX *ctx, X509_NAME *nm)
 504 {
 505         int i, idx, cnt;
 506         STACK_OF(X509) *sk;
 507         X509 *x;
 508         X509_OBJECT *obj;
 509
 510         sk = sk_X509_new_null();
 511         if (sk == NULL)
 512                 return NULL;
 513         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 514         idx = x509_object_idx_cnt(ctx->ctx->objs, X509_LU_X509, nm, &cnt);
 515         if (idx < 0) {
 516                 /* Nothing found in cache: do lookup to possibly add new
 517                  * objects to cache
 518                  */
 519                 X509_OBJECT xobj;
 520                 CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 521                 if (!X509_STORE_get_by_subject(ctx, X509_LU_X509, nm, &xobj)) {
 522                         sk_X509_free(sk);
 523                         return NULL;
 524                 }
 525                 X509_OBJECT_free_contents(&xobj);
 526                 CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 527                 idx = x509_object_idx_cnt(ctx->ctx->objs,
 528                     X509_LU_X509, nm, &cnt);
 529                 if (idx < 0) {
 530                         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 531                         sk_X509_free(sk);
 532                         return NULL;
 533                 }
 534         }
 535         for (i = 0; i < cnt; i++, idx++) {
 536                 obj = sk_X509_OBJECT_value(ctx->ctx->objs, idx);
 537                 x = obj->data.x509;
 538                 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
 539                 if (!sk_X509_push(sk, x)) {
 540                         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 541                         X509_free(x);
 542                         sk_X509_pop_free(sk, X509_free);
 543                         return NULL;
 544                 }
 545         }
 546         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 547         return sk;
 548
 549 }
 550
 551 STACK_OF(X509_CRL) *
 552 X509_STORE_get1_crls(X509_STORE_CTX *ctx, X509_NAME *nm)
 553 {
 554         int i, idx, cnt;
 555         STACK_OF(X509_CRL) *sk;
 556         X509_CRL *x;
 557         X509_OBJECT *obj, xobj;
 558
 559         sk = sk_X509_CRL_new_null();
 560         if (sk == NULL)
 561                 return NULL;
 562         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 563         /* Check cache first */
 564         idx = x509_object_idx_cnt(ctx->ctx->objs, X509_LU_CRL, nm, &cnt);
 565
 566         /* Always do lookup to possibly add new CRLs to cache
 567          */
 568         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 569         if (!X509_STORE_get_by_subject(ctx, X509_LU_CRL, nm, &xobj)) {
 570                 sk_X509_CRL_free(sk);
 571                 return NULL;
 572         }
 573         X509_OBJECT_free_contents(&xobj);
 574         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 575         idx = x509_object_idx_cnt(ctx->ctx->objs, X509_LU_CRL, nm, &cnt);
 576         if (idx < 0) {
 577                 CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 578                 sk_X509_CRL_free(sk);
 579                 return NULL;
 580         }
 581
 582         for (i = 0; i < cnt; i++, idx++) {
 583                 obj = sk_X509_OBJECT_value(ctx->ctx->objs, idx);
 584                 x = obj->data.crl;
 585                 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509_CRL);
 586                 if (!sk_X509_CRL_push(sk, x)) {
 587                         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 588                         X509_CRL_free(x);
 589                         sk_X509_CRL_pop_free(sk, X509_CRL_free);
 590                         return NULL;
 591                 }
 592         }
 593         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 594         return sk;
 595 }
 596
 597 X509_OBJECT *
 598 X509_OBJECT_retrieve_match(STACK_OF(X509_OBJECT) *h, X509_OBJECT *x)
 599 {
 600         int idx, i;
 601         X509_OBJECT *obj;
 602
 603         idx = sk_X509_OBJECT_find(h, x);
 604         if (idx == -1)
 605                 return NULL;
 606         if ((x->type != X509_LU_X509) && (x->type != X509_LU_CRL))
 607                 return sk_X509_OBJECT_value(h, idx);
 608         for (i = idx; i < sk_X509_OBJECT_num(h); i++) {
 609                 obj = sk_X509_OBJECT_value(h, i);
 610                 if (x509_object_cmp((const X509_OBJECT **)&obj,
 611                     (const X509_OBJECT **)&x))
 612                         return NULL;
 613                 if (x->type == X509_LU_X509) {
 614                         if (!X509_cmp(obj->data.x509, x->data.x509))
 615                                 return obj;
 616                 } else if (x->type == X509_LU_CRL) {
 617                         if (!X509_CRL_match(obj->data.crl, x->data.crl))
 618                                 return obj;
 619                 } else
 620                         return obj;
 621         }
 622         return NULL;
 623 }
 624
 625
 626 /* Try to get issuer certificate from store. Due to limitations
 627  * of the API this can only retrieve a single certificate matching
 628  * a given subject name. However it will fill the cache with all
 629  * matching certificates, so we can examine the cache for all
 630  * matches.
 631  *
 632  * Return values are:
 633  *  1 lookup successful.
 634  *  0 certificate not found.
 635  * -1 some other error.
 636  */
 637 int
 638 X509_STORE_CTX_get1_issuer(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
 639 {
 640         X509_NAME *xn;
 641         X509_OBJECT obj, *pobj;
 642         int i, ok, idx, ret;
 643
 644         *issuer = NULL;
 645         xn = X509_get_issuer_name(x);
 646         ok = X509_STORE_get_by_subject(ctx, X509_LU_X509, xn, &obj);
 647         if (ok != X509_LU_X509) {
 648                 if (ok == X509_LU_RETRY) {
 649                         X509_OBJECT_free_contents(&obj);
 650                         X509err(X509_F_X509_STORE_CTX_GET1_ISSUER,
 651                             X509_R_SHOULD_RETRY);
 652                         return -1;
 653                 } else if (ok != X509_LU_FAIL) {
 654                         X509_OBJECT_free_contents(&obj);
 655                         /* not good :-(, break anyway */
 656                         return -1;
 657                 }
 658                 return 0;
 659         }
 660         /* If certificate matches all OK */
 661         if (ctx->check_issued(ctx, x, obj.data.x509)) {
 662                 if (x509_check_cert_time(ctx, obj.data.x509, 1)) {
 663                         *issuer = obj.data.x509;
 664                         return 1;
 665                 }
 666         }
 667         X509_OBJECT_free_contents(&obj);
 668
 669         /* Else find index of first cert accepted by 'check_issued' */
 670         ret = 0;
 671         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 672         idx = X509_OBJECT_idx_by_subject(ctx->ctx->objs, X509_LU_X509, xn);
 673         if (idx != -1) /* should be true as we've had at least one match */ {
 674                 /* Look through all matching certs for suitable issuer */
 675                 for (i = idx; i < sk_X509_OBJECT_num(ctx->ctx->objs); i++) {
 676                         pobj = sk_X509_OBJECT_value(ctx->ctx->objs, i);
 677                         /* See if we've run past the matches */
 678                         if (pobj->type != X509_LU_X509)
 679                                 break;
 680                         if (X509_NAME_cmp(xn,
 681                             X509_get_subject_name(pobj->data.x509)))
 682                                 break;
 683                         if (ctx->check_issued(ctx, x, pobj->data.x509)) {
 684                                 *issuer = pobj->data.x509;
 685                                 ret = 1;
 686                                 /*
 687                                  * If times check, exit with match,
 688                                  * otherwise keep looking. Leave last
 689                                  * match in issuer so we return nearest
 690                                  * match if no certificate time is OK.
 691                                  */
 692                                 if (x509_check_cert_time(ctx, *issuer, 1))
 693                                         break;
 694                         }
 695                 }
 696         }
 697         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 698         if (*issuer)
 699                 CRYPTO_add(&(*issuer)->references, 1, CRYPTO_LOCK_X509);
 700         return ret;
 701 }
 702
 703 int
 704 X509_STORE_set_flags(X509_STORE *ctx, unsigned long flags)
 705 {
 706         return X509_VERIFY_PARAM_set_flags(ctx->param, flags);
 707 }
 708
 709 int
 710 X509_STORE_set_depth(X509_STORE *ctx, int depth)
 711 {
 712         X509_VERIFY_PARAM_set_depth(ctx->param, depth);
 713         return 1;
 714 }
 715
 716 int
 717 X509_STORE_set_purpose(X509_STORE *ctx, int purpose)
 718 {
 719         return X509_VERIFY_PARAM_set_purpose(ctx->param, purpose);
 720 }
 721
 722 int
 723 X509_STORE_set_trust(X509_STORE *ctx, int trust)
 724 {
 725         return X509_VERIFY_PARAM_set_trust(ctx->param, trust);
 726 }
 727
 728 int
 729 X509_STORE_set1_param(X509_STORE *ctx, X509_VERIFY_PARAM *param)
 730 {
 731         return X509_VERIFY_PARAM_set1(ctx->param, param);
 732 }
 733
 734 void
 735 X509_STORE_set_verify_cb(X509_STORE *ctx,
 736     int (*verify_cb)(int, X509_STORE_CTX *))
 737 {
 738         ctx->verify_cb = verify_cb;
 739 }