release/src-rt-6.x.4708/router/openssl/crypto/x509/x509_lu.c

   1 /* crypto/x509/x509_lu.c */
   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 #include "cryptlib.h"
  61 #include <openssl/lhash.h>
  62 #include <openssl/x509.h>
  63 #include <openssl/x509v3.h>
  64
  65 X509_LOOKUP *X509_LOOKUP_new(X509_LOOKUP_METHOD *method)
  66 {
  67     X509_LOOKUP *ret;
  68
  69     ret = (X509_LOOKUP *)OPENSSL_malloc(sizeof(X509_LOOKUP));
  70     if (ret == NULL)
  71         return NULL;
  72
  73     ret->init = 0;
  74     ret->skip = 0;
  75     ret->method = method;
  76     ret->method_data = NULL;
  77     ret->store_ctx = NULL;
  78     if ((method->new_item != NULL) && !method->new_item(ret)) {
  79         OPENSSL_free(ret);
  80         return NULL;
  81     }
  82     return ret;
  83 }
  84
  85 void X509_LOOKUP_free(X509_LOOKUP *ctx)
  86 {
  87     if (ctx == NULL)
  88         return;
  89     if ((ctx->method != NULL) && (ctx->method->free != NULL))
  90         (*ctx->method->free) (ctx);
  91     OPENSSL_free(ctx);
  92 }
  93
  94 int X509_LOOKUP_init(X509_LOOKUP *ctx)
  95 {
  96     if (ctx->method == NULL)
  97         return 0;
  98     if (ctx->method->init != NULL)
  99         return ctx->method->init(ctx);
 100     else
 101         return 1;
 102 }
 103
 104 int X509_LOOKUP_shutdown(X509_LOOKUP *ctx)
 105 {
 106     if (ctx->method == NULL)
 107         return 0;
 108     if (ctx->method->shutdown != NULL)
 109         return ctx->method->shutdown(ctx);
 110     else
 111         return 1;
 112 }
 113
 114 int X509_LOOKUP_ctrl(X509_LOOKUP *ctx, int cmd, const char *argc, long argl,
 115                      char **ret)
 116 {
 117     if (ctx->method == NULL)
 118         return -1;
 119     if (ctx->method->ctrl != NULL)
 120         return ctx->method->ctrl(ctx, cmd, argc, argl, ret);
 121     else
 122         return 1;
 123 }
 124
 125 int X509_LOOKUP_by_subject(X509_LOOKUP *ctx, int type, X509_NAME *name,
 126                            X509_OBJECT *ret)
 127 {
 128     if ((ctx->method == NULL) || (ctx->method->get_by_subject == NULL))
 129         return X509_LU_FAIL;
 130     if (ctx->skip)
 131         return 0;
 132     return ctx->method->get_by_subject(ctx, type, name, ret);
 133 }
 134
 135 int X509_LOOKUP_by_issuer_serial(X509_LOOKUP *ctx, int type, X509_NAME *name,
 136                                  ASN1_INTEGER *serial, X509_OBJECT *ret)
 137 {
 138     if ((ctx->method == NULL) || (ctx->method->get_by_issuer_serial == NULL))
 139         return X509_LU_FAIL;
 140     return ctx->method->get_by_issuer_serial(ctx, type, name, serial, ret);
 141 }
 142
 143 int X509_LOOKUP_by_fingerprint(X509_LOOKUP *ctx, int type,
 144                                unsigned char *bytes, int len,
 145                                X509_OBJECT *ret)
 146 {
 147     if ((ctx->method == NULL) || (ctx->method->get_by_fingerprint == NULL))
 148         return X509_LU_FAIL;
 149     return ctx->method->get_by_fingerprint(ctx, type, bytes, len, ret);
 150 }
 151
 152 int X509_LOOKUP_by_alias(X509_LOOKUP *ctx, int type, char *str, int len,
 153                          X509_OBJECT *ret)
 154 {
 155     if ((ctx->method == NULL) || (ctx->method->get_by_alias == NULL))
 156         return X509_LU_FAIL;
 157     return ctx->method->get_by_alias(ctx, type, str, len, ret);
 158 }
 159
 160 static int x509_object_cmp(const X509_OBJECT *const *a,
 161                            const X509_OBJECT *const *b)
 162 {
 163     int ret;
 164
 165     ret = ((*a)->type - (*b)->type);
 166     if (ret)
 167         return ret;
 168     switch ((*a)->type) {
 169     case X509_LU_X509:
 170         ret = X509_subject_name_cmp((*a)->data.x509, (*b)->data.x509);
 171         break;
 172     case X509_LU_CRL:
 173         ret = X509_CRL_cmp((*a)->data.crl, (*b)->data.crl);
 174         break;
 175     default:
 176         /* abort(); */
 177         return 0;
 178     }
 179     return ret;
 180 }
 181
 182 X509_STORE *X509_STORE_new(void)
 183 {
 184     X509_STORE *ret;
 185
 186     if ((ret = (X509_STORE *)OPENSSL_malloc(sizeof(X509_STORE))) == NULL)
 187         return NULL;
 188     ret->objs = sk_X509_OBJECT_new(x509_object_cmp);
 189     ret->cache = 1;
 190     ret->get_cert_methods = sk_X509_LOOKUP_new_null();
 191     ret->verify = 0;
 192     ret->verify_cb = 0;
 193
 194     if ((ret->param = X509_VERIFY_PARAM_new()) == NULL)
 195         return NULL;
 196
 197     ret->get_issuer = 0;
 198     ret->check_issued = 0;
 199     ret->check_revocation = 0;
 200     ret->get_crl = 0;
 201     ret->check_crl = 0;
 202     ret->cert_crl = 0;
 203     ret->lookup_certs = 0;
 204     ret->lookup_crls = 0;
 205     ret->cleanup = 0;
 206
 207     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE, ret, &ret->ex_data)) {
 208         sk_X509_OBJECT_free(ret->objs);
 209         OPENSSL_free(ret);
 210         return NULL;
 211     }
 212
 213     ret->references = 1;
 214     return ret;
 215 }
 216
 217 static void cleanup(X509_OBJECT *a)
 218 {
 219     if (a->type == X509_LU_X509) {
 220         X509_free(a->data.x509);
 221     } else if (a->type == X509_LU_CRL) {
 222         X509_CRL_free(a->data.crl);
 223     } else {
 224         /* abort(); */
 225     }
 226
 227     OPENSSL_free(a);
 228 }
 229
 230 void X509_STORE_free(X509_STORE *vfy)
 231 {
 232     int i;
 233     STACK_OF(X509_LOOKUP) *sk;
 234     X509_LOOKUP *lu;
 235
 236     if (vfy == NULL)
 237         return;
 238
 239     i = CRYPTO_add(&vfy->references, -1, CRYPTO_LOCK_X509_STORE);
 240 #ifdef REF_PRINT
 241     REF_PRINT("X509_STORE", vfy);
 242 #endif
 243     if (i > 0)
 244         return;
 245 #ifdef REF_CHECK
 246     if (i < 0) {
 247         fprintf(stderr, "X509_STORE_free, bad reference count\n");
 248         abort();                /* ok */
 249     }
 250 #endif
 251
 252     sk = vfy->get_cert_methods;
 253     for (i = 0; i < sk_X509_LOOKUP_num(sk); i++) {
 254         lu = sk_X509_LOOKUP_value(sk, i);
 255         X509_LOOKUP_shutdown(lu);
 256         X509_LOOKUP_free(lu);
 257     }
 258     sk_X509_LOOKUP_free(sk);
 259     sk_X509_OBJECT_pop_free(vfy->objs, cleanup);
 260
 261     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE, vfy, &vfy->ex_data);
 262     if (vfy->param)
 263         X509_VERIFY_PARAM_free(vfy->param);
 264     OPENSSL_free(vfy);
 265 }
 266
 267 X509_LOOKUP *X509_STORE_add_lookup(X509_STORE *v, X509_LOOKUP_METHOD *m)
 268 {
 269     int i;
 270     STACK_OF(X509_LOOKUP) *sk;
 271     X509_LOOKUP *lu;
 272
 273     sk = v->get_cert_methods;
 274     for (i = 0; i < sk_X509_LOOKUP_num(sk); i++) {
 275         lu = sk_X509_LOOKUP_value(sk, i);
 276         if (m == lu->method) {
 277             return lu;
 278         }
 279     }
 280     /* a new one */
 281     lu = X509_LOOKUP_new(m);
 282     if (lu == NULL)
 283         return NULL;
 284     else {
 285         lu->store_ctx = v;
 286         if (sk_X509_LOOKUP_push(v->get_cert_methods, lu))
 287             return lu;
 288         else {
 289             X509_LOOKUP_free(lu);
 290             return NULL;
 291         }
 292     }
 293 }
 294
 295 int X509_STORE_get_by_subject(X509_STORE_CTX *vs, int type, X509_NAME *name,
 296                               X509_OBJECT *ret)
 297 {
 298     X509_STORE *ctx = vs->ctx;
 299     X509_LOOKUP *lu;
 300     X509_OBJECT stmp, *tmp;
 301     int i, j;
 302
 303     CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 304     tmp = X509_OBJECT_retrieve_by_subject(ctx->objs, type, name);
 305     CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 306
 307     if (tmp == NULL || type == X509_LU_CRL) {
 308         for (i = vs->current_method;
 309              i < sk_X509_LOOKUP_num(ctx->get_cert_methods); i++) {
 310             lu = sk_X509_LOOKUP_value(ctx->get_cert_methods, i);
 311             j = X509_LOOKUP_by_subject(lu, type, name, &stmp);
 312             if (j < 0) {
 313                 vs->current_method = j;
 314                 return j;
 315             } else if (j) {
 316                 tmp = &stmp;
 317                 break;
 318             }
 319         }
 320         vs->current_method = 0;
 321         if (tmp == NULL)
 322             return 0;
 323     }
 324
 325 /*- if (ret->data.ptr != NULL)
 326             X509_OBJECT_free_contents(ret); */
 327
 328     ret->type = tmp->type;
 329     ret->data.ptr = tmp->data.ptr;
 330
 331     X509_OBJECT_up_ref_count(ret);
 332
 333     return 1;
 334 }
 335
 336 int X509_STORE_add_cert(X509_STORE *ctx, X509 *x)
 337 {
 338     X509_OBJECT *obj;
 339     int ret = 1;
 340
 341     if (x == NULL)
 342         return 0;
 343     obj = (X509_OBJECT *)OPENSSL_malloc(sizeof(X509_OBJECT));
 344     if (obj == NULL) {
 345         X509err(X509_F_X509_STORE_ADD_CERT, ERR_R_MALLOC_FAILURE);
 346         return 0;
 347     }
 348     obj->type = X509_LU_X509;
 349     obj->data.x509 = x;
 350
 351     CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 352
 353     X509_OBJECT_up_ref_count(obj);
 354
 355     if (X509_OBJECT_retrieve_match(ctx->objs, obj)) {
 356         X509_OBJECT_free_contents(obj);
 357         OPENSSL_free(obj);
 358         X509err(X509_F_X509_STORE_ADD_CERT,
 359                 X509_R_CERT_ALREADY_IN_HASH_TABLE);
 360         ret = 0;
 361     } else
 362         sk_X509_OBJECT_push(ctx->objs, obj);
 363
 364     CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 365
 366     return ret;
 367 }
 368
 369 int X509_STORE_add_crl(X509_STORE *ctx, X509_CRL *x)
 370 {
 371     X509_OBJECT *obj;
 372     int ret = 1;
 373
 374     if (x == NULL)
 375         return 0;
 376     obj = (X509_OBJECT *)OPENSSL_malloc(sizeof(X509_OBJECT));
 377     if (obj == NULL) {
 378         X509err(X509_F_X509_STORE_ADD_CRL, ERR_R_MALLOC_FAILURE);
 379         return 0;
 380     }
 381     obj->type = X509_LU_CRL;
 382     obj->data.crl = x;
 383
 384     CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 385
 386     X509_OBJECT_up_ref_count(obj);
 387
 388     if (X509_OBJECT_retrieve_match(ctx->objs, obj)) {
 389         X509_OBJECT_free_contents(obj);
 390         OPENSSL_free(obj);
 391         X509err(X509_F_X509_STORE_ADD_CRL, X509_R_CERT_ALREADY_IN_HASH_TABLE);
 392         ret = 0;
 393     } else
 394         sk_X509_OBJECT_push(ctx->objs, obj);
 395
 396     CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 397
 398     return ret;
 399 }
 400
 401 void X509_OBJECT_up_ref_count(X509_OBJECT *a)
 402 {
 403     switch (a->type) {
 404     case X509_LU_X509:
 405         CRYPTO_add(&a->data.x509->references, 1, CRYPTO_LOCK_X509);
 406         break;
 407     case X509_LU_CRL:
 408         CRYPTO_add(&a->data.crl->references, 1, CRYPTO_LOCK_X509_CRL);
 409         break;
 410     }
 411 }
 412
 413 void X509_OBJECT_free_contents(X509_OBJECT *a)
 414 {
 415     switch (a->type) {
 416     case X509_LU_X509:
 417         X509_free(a->data.x509);
 418         break;
 419     case X509_LU_CRL:
 420         X509_CRL_free(a->data.crl);
 421         break;
 422     }
 423 }
 424
 425 static int x509_object_idx_cnt(STACK_OF(X509_OBJECT) *h, int type,
 426                                X509_NAME *name, int *pnmatch)
 427 {
 428     X509_OBJECT stmp;
 429     X509 x509_s;
 430     X509_CINF cinf_s;
 431     X509_CRL crl_s;
 432     X509_CRL_INFO crl_info_s;
 433     int idx;
 434
 435     stmp.type = type;
 436     switch (type) {
 437     case X509_LU_X509:
 438         stmp.data.x509 = &x509_s;
 439         x509_s.cert_info = &cinf_s;
 440         cinf_s.subject = name;
 441         break;
 442     case X509_LU_CRL:
 443         stmp.data.crl = &crl_s;
 444         crl_s.crl = &crl_info_s;
 445         crl_info_s.issuer = name;
 446         break;
 447     default:
 448         /* abort(); */
 449         return -1;
 450     }
 451
 452     idx = sk_X509_OBJECT_find(h, &stmp);
 453     if (idx >= 0 && pnmatch) {
 454         int tidx;
 455         const X509_OBJECT *tobj, *pstmp;
 456         *pnmatch = 1;
 457         pstmp = &stmp;
 458         for (tidx = idx + 1; tidx < sk_X509_OBJECT_num(h); tidx++) {
 459             tobj = sk_X509_OBJECT_value(h, tidx);
 460             if (x509_object_cmp(&tobj, &pstmp))
 461                 break;
 462             (*pnmatch)++;
 463         }
 464     }
 465     return idx;
 466 }
 467
 468 int X509_OBJECT_idx_by_subject(STACK_OF(X509_OBJECT) *h, int type,
 469                                X509_NAME *name)
 470 {
 471     return x509_object_idx_cnt(h, type, name, NULL);
 472 }
 473
 474 X509_OBJECT *X509_OBJECT_retrieve_by_subject(STACK_OF(X509_OBJECT) *h,
 475                                              int type, X509_NAME *name)
 476 {
 477     int idx;
 478     idx = X509_OBJECT_idx_by_subject(h, type, name);
 479     if (idx == -1)
 480         return NULL;
 481     return sk_X509_OBJECT_value(h, idx);
 482 }
 483
 484 STACK_OF(X509) *X509_STORE_get1_certs(X509_STORE_CTX *ctx, X509_NAME *nm)
 485 {
 486     int i, idx, cnt;
 487     STACK_OF(X509) *sk;
 488     X509 *x;
 489     X509_OBJECT *obj;
 490     sk = sk_X509_new_null();
 491     CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 492     idx = x509_object_idx_cnt(ctx->ctx->objs, X509_LU_X509, nm, &cnt);
 493     if (idx < 0) {
 494         /*
 495          * Nothing found in cache: do lookup to possibly add new objects to
 496          * cache
 497          */
 498         X509_OBJECT xobj;
 499         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 500         if (!X509_STORE_get_by_subject(ctx, X509_LU_X509, nm, &xobj)) {
 501             sk_X509_free(sk);
 502             return NULL;
 503         }
 504         X509_OBJECT_free_contents(&xobj);
 505         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 506         idx = x509_object_idx_cnt(ctx->ctx->objs, X509_LU_X509, nm, &cnt);
 507         if (idx < 0) {
 508             CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 509             sk_X509_free(sk);
 510             return NULL;
 511         }
 512     }
 513     for (i = 0; i < cnt; i++, idx++) {
 514         obj = sk_X509_OBJECT_value(ctx->ctx->objs, idx);
 515         x = obj->data.x509;
 516         CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
 517         if (!sk_X509_push(sk, x)) {
 518             CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 519             X509_free(x);
 520             sk_X509_pop_free(sk, X509_free);
 521             return NULL;
 522         }
 523     }
 524     CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 525     return sk;
 526
 527 }
 528
 529 STACK_OF(X509_CRL) *X509_STORE_get1_crls(X509_STORE_CTX *ctx, X509_NAME *nm)
 530 {
 531     int i, idx, cnt;
 532     STACK_OF(X509_CRL) *sk;
 533     X509_CRL *x;
 534     X509_OBJECT *obj, xobj;
 535     sk = sk_X509_CRL_new_null();
 536     CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 537     /* Check cache first */
 538     idx = x509_object_idx_cnt(ctx->ctx->objs, X509_LU_CRL, nm, &cnt);
 539
 540     /*
 541      * Always do lookup to possibly add new CRLs to cache
 542      */
 543     CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 544     if (!X509_STORE_get_by_subject(ctx, X509_LU_CRL, nm, &xobj)) {
 545         sk_X509_CRL_free(sk);
 546         return NULL;
 547     }
 548     X509_OBJECT_free_contents(&xobj);
 549     CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 550     idx = x509_object_idx_cnt(ctx->ctx->objs, X509_LU_CRL, nm, &cnt);
 551     if (idx < 0) {
 552         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 553         sk_X509_CRL_free(sk);
 554         return NULL;
 555     }
 556
 557     for (i = 0; i < cnt; i++, idx++) {
 558         obj = sk_X509_OBJECT_value(ctx->ctx->objs, idx);
 559         x = obj->data.crl;
 560         CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509_CRL);
 561         if (!sk_X509_CRL_push(sk, x)) {
 562             CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 563             X509_CRL_free(x);
 564             sk_X509_CRL_pop_free(sk, X509_CRL_free);
 565             return NULL;
 566         }
 567     }
 568     CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 569     return sk;
 570 }
 571
 572 X509_OBJECT *X509_OBJECT_retrieve_match(STACK_OF(X509_OBJECT) *h,
 573                                         X509_OBJECT *x)
 574 {
 575     int idx, i;
 576     X509_OBJECT *obj;
 577     idx = sk_X509_OBJECT_find(h, x);
 578     if (idx == -1)
 579         return NULL;
 580     if ((x->type != X509_LU_X509) && (x->type != X509_LU_CRL))
 581         return sk_X509_OBJECT_value(h, idx);
 582     for (i = idx; i < sk_X509_OBJECT_num(h); i++) {
 583         obj = sk_X509_OBJECT_value(h, i);
 584         if (x509_object_cmp
 585             ((const X509_OBJECT **)&obj, (const X509_OBJECT **)&x))
 586             return NULL;
 587         if (x->type == X509_LU_X509) {
 588             if (!X509_cmp(obj->data.x509, x->data.x509))
 589                 return obj;
 590         } else if (x->type == X509_LU_CRL) {
 591             if (!X509_CRL_match(obj->data.crl, x->data.crl))
 592                 return obj;
 593         } else
 594             return obj;
 595     }
 596     return NULL;
 597 }
 598
 599 /*-
 600  * Try to get issuer certificate from store. Due to limitations
 601  * of the API this can only retrieve a single certificate matching
 602  * a given subject name. However it will fill the cache with all
 603  * matching certificates, so we can examine the cache for all
 604  * matches.
 605  *
 606  * Return values are:
 607  *  1 lookup successful.
 608  *  0 certificate not found.
 609  * -1 some other error.
 610  */
 611 int X509_STORE_CTX_get1_issuer(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
 612 {
 613     X509_NAME *xn;
 614     X509_OBJECT obj, *pobj;
 615     int i, ok, idx, ret;
 616     xn = X509_get_issuer_name(x);
 617     ok = X509_STORE_get_by_subject(ctx, X509_LU_X509, xn, &obj);
 618     if (ok != X509_LU_X509) {
 619         if (ok == X509_LU_RETRY) {
 620             X509_OBJECT_free_contents(&obj);
 621             X509err(X509_F_X509_STORE_CTX_GET1_ISSUER, X509_R_SHOULD_RETRY);
 622             return -1;
 623         } else if (ok != X509_LU_FAIL) {
 624             X509_OBJECT_free_contents(&obj);
 625             /* not good :-(, break anyway */
 626             return -1;
 627         }
 628         return 0;
 629     }
 630     /* If certificate matches all OK */
 631     if (ctx->check_issued(ctx, x, obj.data.x509)) {
 632         *issuer = obj.data.x509;
 633         return 1;
 634     }
 635     X509_OBJECT_free_contents(&obj);
 636
 637     /* Else find index of first cert accepted by 'check_issued' */
 638     ret = 0;
 639     CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 640     idx = X509_OBJECT_idx_by_subject(ctx->ctx->objs, X509_LU_X509, xn);
 641     if (idx != -1) {            /* should be true as we've had at least one
 642                                  * match */
 643         /* Look through all matching certs for suitable issuer */
 644         for (i = idx; i < sk_X509_OBJECT_num(ctx->ctx->objs); i++) {
 645             pobj = sk_X509_OBJECT_value(ctx->ctx->objs, i);
 646             /* See if we've run past the matches */
 647             if (pobj->type != X509_LU_X509)
 648                 break;
 649             if (X509_NAME_cmp(xn, X509_get_subject_name(pobj->data.x509)))
 650                 break;
 651             if (ctx->check_issued(ctx, x, pobj->data.x509)) {
 652                 *issuer = pobj->data.x509;
 653                 X509_OBJECT_up_ref_count(pobj);
 654                 ret = 1;
 655                 break;
 656             }
 657         }
 658     }
 659     CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 660     return ret;
 661 }
 662
 663 int X509_STORE_set_flags(X509_STORE *ctx, unsigned long flags)
 664 {
 665     return X509_VERIFY_PARAM_set_flags(ctx->param, flags);
 666 }
 667
 668 int X509_STORE_set_depth(X509_STORE *ctx, int depth)
 669 {
 670     X509_VERIFY_PARAM_set_depth(ctx->param, depth);
 671     return 1;
 672 }
 673
 674 int X509_STORE_set_purpose(X509_STORE *ctx, int purpose)
 675 {
 676     return X509_VERIFY_PARAM_set_purpose(ctx->param, purpose);
 677 }
 678
 679 int X509_STORE_set_trust(X509_STORE *ctx, int trust)
 680 {
 681     return X509_VERIFY_PARAM_set_trust(ctx->param, trust);
 682 }
 683
 684 int X509_STORE_set1_param(X509_STORE *ctx, X509_VERIFY_PARAM *param)
 685 {
 686     return X509_VERIFY_PARAM_set1(ctx->param, param);
 687 }
 688
 689 void X509_STORE_set_verify_cb(X509_STORE *ctx,
 690                               int (*verify_cb) (int, X509_STORE_CTX *))
 691 {
 692     ctx->verify_cb = verify_cb;
 693 }
 694
 695 void X509_STORE_set_lookup_crls_cb(X509_STORE *ctx,
 696                                    STACK_OF(X509_CRL) *(*cb) (X509_STORE_CTX
 697                                                               *ctx,
 698                                                               X509_NAME *nm))
 699 {
 700     ctx->lookup_crls = cb;
 701 }
 702
 703 X509_STORE *X509_STORE_CTX_get0_store(X509_STORE_CTX *ctx)
 704 {
 705     return ctx->ctx;
 706 }
 707
 708 IMPLEMENT_STACK_OF(X509_LOOKUP)
 709
 710 IMPLEMENT_STACK_OF(X509_OBJECT)