crypto/x509/x509_vfy.c

   1 /* crypto/x509/x509_vfy.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 <time.h>
  61 #include <errno.h>
  62
  63 #include "cryptlib.h"
  64 #include <openssl/crypto.h>
  65 #include <openssl/lhash.h>
  66 #include <openssl/buffer.h>
  67 #include <openssl/evp.h>
  68 #include <openssl/asn1.h>
  69 #include <openssl/x509.h>
  70 #include <openssl/objects.h>
  71
  72 static int null_callback(int ok,X509_STORE_CTX *e);
  73 static int internal_verify(X509_STORE_CTX *ctx);
  74 const char *X509_version="X.509" OPENSSL_VERSION_PTEXT;
  75
  76 static STACK *x509_store_ctx_method=NULL;
  77 static int x509_store_ctx_num=0;
  78 #if 0
  79 static int x509_store_num=1;
  80 static STACK *x509_store_method=NULL;
  81 #endif
  82
  83 static int null_callback(int ok, X509_STORE_CTX *e)
  84         {
  85         return(ok);
  86         }
  87
  88 #if 0
  89 static int x509_subject_cmp(X509 **a, X509 **b)
  90         {
  91         return(X509_subject_name_cmp(*a,*b));
  92         }
  93 #endif
  94
  95 int X509_verify_cert(X509_STORE_CTX *ctx)
  96         {
  97         X509 *x,*xtmp,*chain_ss=NULL;
  98         X509_NAME *xn;
  99         X509_OBJECT obj;
 100         int depth,i,ok=0;
 101         int num;
 102         int (*cb)();
 103         STACK_OF(X509) *sktmp=NULL;
 104
 105         if (ctx->cert == NULL)
 106                 {
 107                 X509err(X509_F_X509_VERIFY_CERT,X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
 108                 return(-1);
 109                 }
 110
 111         cb=ctx->ctx->verify_cb;
 112         if (cb == NULL) cb=null_callback;
 113
 114         /* first we make sure the chain we are going to build is
 115          * present and that the first entry is in place */
 116         if (ctx->chain == NULL)
 117                 {
 118                 if (    ((ctx->chain=sk_X509_new_null()) == NULL) ||
 119                         (!sk_X509_push(ctx->chain,ctx->cert)))
 120                         {
 121                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 122                         goto end;
 123                         }
 124                 CRYPTO_add(&ctx->cert->references,1,CRYPTO_LOCK_X509);
 125                 ctx->last_untrusted=1;
 126                 }
 127
 128         /* We use a temporary so we can chop and hack at it */
 129         if (ctx->untrusted != NULL
 130             && (sktmp=sk_X509_dup(ctx->untrusted)) == NULL)
 131                 {
 132                 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 133                 goto end;
 134                 }
 135
 136         num=sk_X509_num(ctx->chain);
 137         x=sk_X509_value(ctx->chain,num-1);
 138         depth=ctx->depth;
 139
 140
 141         for (;;)
 142                 {
 143                 /* If we have enough, we break */
 144                 if (depth < num) break; /* FIXME: If this happens, we should take
 145                                          * note of it and, if appropriate, use the
 146                                          * X509_V_ERR_CERT_CHAIN_TOO_LONG error
 147                                          * code later.
 148                                          */
 149
 150                 /* If we are self signed, we break */
 151                 xn=X509_get_issuer_name(x);
 152                 if (X509_NAME_cmp(X509_get_subject_name(x),xn) == 0)
 153                         break;
 154
 155                 /* If we were passed a cert chain, use it first */
 156                 if (ctx->untrusted != NULL)
 157                         {
 158                         xtmp=X509_find_by_subject(sktmp,xn);
 159                         if (xtmp != NULL)
 160                                 {
 161                                 if (!sk_X509_push(ctx->chain,xtmp))
 162                                         {
 163                                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 164                                         goto end;
 165                                         }
 166                                 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
 167                                 sk_X509_delete_ptr(sktmp,xtmp);
 168                                 ctx->last_untrusted++;
 169                                 x=xtmp;
 170                                 num++;
 171                                 /* reparse the full chain for
 172                                  * the next one */
 173                                 continue;
 174                                 }
 175                         }
 176                 break;
 177                 }
 178
 179         /* at this point, chain should contain a list of untrusted
 180          * certificates.  We now need to add at least one trusted one,
 181          * if possible, otherwise we complain. */
 182
 183         i=sk_X509_num(ctx->chain);
 184         x=sk_X509_value(ctx->chain,i-1);
 185         if (X509_NAME_cmp(X509_get_subject_name(x),X509_get_issuer_name(x))
 186                 == 0)
 187                 {
 188                 /* we have a self signed certificate */
 189                 if (sk_X509_num(ctx->chain) == 1)
 190                         {
 191                         ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
 192                         ctx->current_cert=x;
 193                         ctx->error_depth=i-1;
 194                         ok=cb(0,ctx);
 195                         if (!ok) goto end;
 196                         }
 197                 else
 198                         {
 199                         /* worry more about this one elsewhere */
 200                         chain_ss=sk_X509_pop(ctx->chain);
 201                         ctx->last_untrusted--;
 202                         num--;
 203                         x=sk_X509_value(ctx->chain,num-1);
 204                         }
 205                 }
 206
 207         /* We now lookup certs from the certificate store */
 208         for (;;)
 209                 {
 210                 /* If we have enough, we break */
 211                 if (depth < num) break;
 212
 213                 /* If we are self signed, we break */
 214                 xn=X509_get_issuer_name(x);
 215                 if (X509_NAME_cmp(X509_get_subject_name(x),xn) == 0)
 216                         break;
 217
 218                 ok=X509_STORE_get_by_subject(ctx,X509_LU_X509,xn,&obj);
 219                 if (ok != X509_LU_X509)
 220                         {
 221                         if (ok == X509_LU_RETRY)
 222                                 {
 223                                 X509_OBJECT_free_contents(&obj);
 224                                 X509err(X509_F_X509_VERIFY_CERT,X509_R_SHOULD_RETRY);
 225                                 return(ok);
 226                                 }
 227                         else if (ok != X509_LU_FAIL)
 228                                 {
 229                                 X509_OBJECT_free_contents(&obj);
 230                                 /* not good :-(, break anyway */
 231                                 return(ok);
 232                                 }
 233                         break;
 234                         }
 235                 x=obj.data.x509;
 236                 if (!sk_X509_push(ctx->chain,obj.data.x509))
 237                         {
 238                         X509_OBJECT_free_contents(&obj);
 239                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 240                         return(0);
 241                         }
 242                 num++;
 243                 }
 244
 245         /* we now have our chain, lets check it... */
 246         xn=X509_get_issuer_name(x);
 247         if (X509_NAME_cmp(X509_get_subject_name(x),xn) != 0)
 248                 {
 249                 if ((chain_ss == NULL) || (X509_NAME_cmp(X509_get_subject_name(chain_ss),xn) != 0))
 250                         {
 251                         if (ctx->last_untrusted >= num)
 252                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
 253                         else
 254                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
 255                         ctx->current_cert=x;
 256                         }
 257                 else
 258                         {
 259
 260                         sk_X509_push(ctx->chain,chain_ss);
 261                         num++;
 262                         ctx->last_untrusted=num;
 263                         ctx->current_cert=chain_ss;
 264                         ctx->error=X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
 265                         chain_ss=NULL;
 266                         }
 267
 268                 ctx->error_depth=num-1;
 269                 ok=cb(0,ctx);
 270                 if (!ok) goto end;
 271                 }
 272
 273         /* We may as well copy down any DSA parameters that are required */
 274         X509_get_pubkey_parameters(NULL,ctx->chain);
 275
 276         /* At this point, we have a chain and just need to verify it */
 277         if (ctx->ctx->verify != NULL)
 278                 ok=ctx->ctx->verify(ctx);
 279         else
 280                 ok=internal_verify(ctx);
 281         if (0)
 282                 {
 283 end:
 284                 X509_get_pubkey_parameters(NULL,ctx->chain);
 285                 }
 286         if (sktmp != NULL) sk_X509_free(sktmp);
 287         if (chain_ss != NULL) X509_free(chain_ss);
 288         return(ok);
 289         }
 290
 291 static int internal_verify(X509_STORE_CTX *ctx)
 292         {
 293         int i,ok=0,n;
 294         X509 *xs,*xi;
 295         EVP_PKEY *pkey=NULL;
 296         int (*cb)();
 297
 298         cb=ctx->ctx->verify_cb;
 299         if (cb == NULL) cb=null_callback;
 300
 301         n=sk_X509_num(ctx->chain);
 302         ctx->error_depth=n-1;
 303         n--;
 304         xi=sk_X509_value(ctx->chain,n);
 305         if (X509_NAME_cmp(X509_get_subject_name(xi),
 306                 X509_get_issuer_name(xi)) == 0)
 307                 xs=xi;
 308         else
 309                 {
 310                 if (n <= 0)
 311                         {
 312                         ctx->error=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
 313                         ctx->current_cert=xi;
 314                         ok=cb(0,ctx);
 315                         goto end;
 316                         }
 317                 else
 318                         {
 319                         n--;
 320                         ctx->error_depth=n;
 321                         xs=sk_X509_value(ctx->chain,n);
 322                         }
 323                 }
 324
 325 /*      ctx->error=0;  not needed */
 326         while (n >= 0)
 327                 {
 328                 ctx->error_depth=n;
 329                 if (!xs->valid)
 330                         {
 331                         if ((pkey=X509_get_pubkey(xi)) == NULL)
 332                                 {
 333                                 ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
 334                                 ctx->current_cert=xi;
 335                                 ok=(*cb)(0,ctx);
 336                                 if (!ok) goto end;
 337                                 }
 338                         if (X509_verify(xs,pkey) <= 0)
 339                                 {
 340                                 EVP_PKEY_free(pkey);
 341                                 ctx->error=X509_V_ERR_CERT_SIGNATURE_FAILURE;
 342                                 ctx->current_cert=xs;
 343                                 ok=(*cb)(0,ctx);
 344                                 if (!ok) goto end;
 345                                 }
 346                         EVP_PKEY_free(pkey);
 347                         pkey=NULL;
 348
 349                         i=X509_cmp_current_time(X509_get_notBefore(xs));
 350                         if (i == 0)
 351                                 {
 352                                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
 353                                 ctx->current_cert=xs;
 354                                 ok=(*cb)(0,ctx);
 355                                 if (!ok) goto end;
 356                                 }
 357                         if (i > 0)
 358                                 {
 359                                 ctx->error=X509_V_ERR_CERT_NOT_YET_VALID;
 360                                 ctx->current_cert=xs;
 361                                 ok=(*cb)(0,ctx);
 362                                 if (!ok) goto end;
 363                                 }
 364                         xs->valid=1;
 365                         }
 366
 367                 i=X509_cmp_current_time(X509_get_notAfter(xs));
 368                 if (i == 0)
 369                         {
 370                         ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
 371                         ctx->current_cert=xs;
 372                         ok=(*cb)(0,ctx);
 373                         if (!ok) goto end;
 374                         }
 375
 376                 if (i < 0)
 377                         {
 378                         ctx->error=X509_V_ERR_CERT_HAS_EXPIRED;
 379                         ctx->current_cert=xs;
 380                         ok=(*cb)(0,ctx);
 381                         if (!ok) goto end;
 382                         }
 383
 384                 /* CRL CHECK */
 385
 386                 /* The last error (if any) is still in the error value */
 387                 ctx->current_cert=xs;
 388                 ok=(*cb)(1,ctx);
 389                 if (!ok) goto end;
 390
 391                 n--;
 392                 if (n >= 0)
 393                         {
 394                         xi=xs;
 395                         xs=sk_X509_value(ctx->chain,n);
 396                         }
 397                 }
 398         ok=1;
 399 end:
 400         return(ok);
 401         }
 402
 403 int X509_cmp_current_time(ASN1_UTCTIME *ctm)
 404         {
 405         char *str;
 406         ASN1_UTCTIME atm;
 407         time_t offset;
 408         char buff1[24],buff2[24],*p;
 409         int i,j;
 410
 411         p=buff1;
 412         i=ctm->length;
 413         str=(char *)ctm->data;
 414         if ((i < 11) || (i > 17)) return(0);
 415         memcpy(p,str,10);
 416         p+=10;
 417         str+=10;
 418
 419         if ((*str == 'Z') || (*str == '-') || (*str == '+'))
 420                 { *(p++)='0'; *(p++)='0'; }
 421         else    { *(p++)= *(str++); *(p++)= *(str++); }
 422         *(p++)='Z';
 423         *(p++)='\0';
 424
 425         if (*str == 'Z')
 426                 offset=0;
 427         else
 428                 {
 429                 if ((*str != '+') && (str[5] != '-'))
 430                         return(0);
 431                 offset=((str[1]-'0')*10+(str[2]-'0'))*60;
 432                 offset+=(str[3]-'0')*10+(str[4]-'0');
 433                 if (*str == '-')
 434                         offset= -offset;
 435                 }
 436         atm.type=V_ASN1_UTCTIME;
 437         atm.length=sizeof(buff2);
 438         atm.data=(unsigned char *)buff2;
 439
 440         X509_gmtime_adj(&atm,-offset);
 441
 442         i=(buff1[0]-'0')*10+(buff1[1]-'0');
 443         if (i < 50) i+=100; /* cf. RFC 2459 */
 444         j=(buff2[0]-'0')*10+(buff2[1]-'0');
 445         if (j < 50) j+=100;
 446
 447         if (i < j) return (-1);
 448         if (i > j) return (1);
 449         i=strcmp(buff1,buff2);
 450         if (i == 0) /* wait a second then return younger :-) */
 451                 return(-1);
 452         else
 453                 return(i);
 454         }
 455
 456 ASN1_UTCTIME *X509_gmtime_adj(ASN1_UTCTIME *s, long adj)
 457         {
 458         time_t t;
 459
 460         time(&t);
 461         t+=adj;
 462         return(ASN1_UTCTIME_set(s,t));
 463         }
 464
 465 int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain)
 466         {
 467         EVP_PKEY *ktmp=NULL,*ktmp2;
 468         int i,j;
 469
 470         if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) return(1);
 471
 472         for (i=0; i<sk_X509_num(chain); i++)
 473                 {
 474                 ktmp=X509_get_pubkey(sk_X509_value(chain,i));
 475                 if (ktmp == NULL)
 476                         {
 477                         X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
 478                         return(0);
 479                         }
 480                 if (!EVP_PKEY_missing_parameters(ktmp))
 481                         break;
 482                 else
 483                         {
 484                         EVP_PKEY_free(ktmp);
 485                         ktmp=NULL;
 486                         }
 487                 }
 488         if (ktmp == NULL)
 489                 {
 490                 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
 491                 return(0);
 492                 }
 493
 494         /* first, populate the other certs */
 495         for (j=i-1; j >= 0; j--)
 496                 {
 497                 ktmp2=X509_get_pubkey(sk_X509_value(chain,j));
 498                 EVP_PKEY_copy_parameters(ktmp2,ktmp);
 499                 EVP_PKEY_free(ktmp2);
 500                 }
 501
 502         if (pkey != NULL) EVP_PKEY_copy_parameters(pkey,ktmp);
 503         EVP_PKEY_free(ktmp);
 504         return(1);
 505         }
 506
 507 int X509_STORE_add_cert(X509_STORE *ctx, X509 *x)
 508         {
 509         X509_OBJECT *obj,*r;
 510         int ret=1;
 511
 512         if (x == NULL) return(0);
 513         obj=(X509_OBJECT *)Malloc(sizeof(X509_OBJECT));
 514         if (obj == NULL)
 515                 {
 516                 X509err(X509_F_X509_STORE_ADD_CERT,ERR_R_MALLOC_FAILURE);
 517                 return(0);
 518                 }
 519         obj->type=X509_LU_X509;
 520         obj->data.x509=x;
 521
 522         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 523
 524         X509_OBJECT_up_ref_count(obj);
 525
 526         r=(X509_OBJECT *)lh_insert(ctx->certs,(char *)obj);
 527         if (r != NULL)
 528                 { /* oops, put it back */
 529                 lh_delete(ctx->certs,(char *)obj);
 530                 X509_OBJECT_free_contents(obj);
 531                 Free(obj);
 532                 lh_insert(ctx->certs,(char *)r);
 533                 X509err(X509_F_X509_STORE_ADD_CERT,X509_R_CERT_ALREADY_IN_HASH_TABLE);
 534                 ret=0;
 535                 }
 536
 537         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 538
 539         return(ret);
 540         }
 541
 542 int X509_STORE_add_crl(X509_STORE *ctx, X509_CRL *x)
 543         {
 544         X509_OBJECT *obj,*r;
 545         int ret=1;
 546
 547         if (x == NULL) return(0);
 548         obj=(X509_OBJECT *)Malloc(sizeof(X509_OBJECT));
 549         if (obj == NULL)
 550                 {
 551                 X509err(X509_F_X509_STORE_ADD_CRL,ERR_R_MALLOC_FAILURE);
 552                 return(0);
 553                 }
 554         obj->type=X509_LU_CRL;
 555         obj->data.crl=x;
 556
 557         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
 558
 559         X509_OBJECT_up_ref_count(obj);
 560
 561         r=(X509_OBJECT *)lh_insert(ctx->certs,(char *)obj);
 562         if (r != NULL)
 563                 { /* oops, put it back */
 564                 lh_delete(ctx->certs,(char *)obj);
 565                 X509_OBJECT_free_contents(obj);
 566                 Free(obj);
 567                 lh_insert(ctx->certs,(char *)r);
 568                 X509err(X509_F_X509_STORE_ADD_CRL,X509_R_CERT_ALREADY_IN_HASH_TABLE);
 569                 ret=0;
 570                 }
 571
 572         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
 573
 574         return(ret);
 575         }
 576
 577 int X509_STORE_CTX_get_ex_new_index(long argl, char *argp, int (*new_func)(),
 578              int (*dup_func)(), void (*free_func)())
 579         {
 580         x509_store_ctx_num++;
 581         return(CRYPTO_get_ex_new_index(x509_store_ctx_num-1,
 582                 &x509_store_ctx_method,
 583                 argl,argp,new_func,dup_func,free_func));
 584         }
 585
 586 int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data)
 587         {
 588         return(CRYPTO_set_ex_data(&ctx->ex_data,idx,data));
 589         }
 590
 591 void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx)
 592         {
 593         return(CRYPTO_get_ex_data(&ctx->ex_data,idx));
 594         }
 595
 596 int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx)
 597         {
 598         return(ctx->error);
 599         }
 600
 601 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err)
 602         {
 603         ctx->error=err;
 604         }
 605
 606 int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx)
 607         {
 608         return(ctx->error_depth);
 609         }
 610
 611 X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx)
 612         {
 613         return(ctx->current_cert);
 614         }
 615
 616 STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx)
 617         {
 618         return(ctx->chain);
 619         }
 620
 621 void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x)
 622         {
 623         ctx->cert=x;
 624         }
 625
 626 void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
 627         {
 628         ctx->untrusted=sk;
 629         }
 630
 631 IMPLEMENT_STACK_OF(X509)
 632 IMPLEMENT_ASN1_SET_OF(X509)
 633
 634 IMPLEMENT_STACK_OF(X509_NAME)
 635
 636 IMPLEMENT_STACK_OF(X509_ATTRIBUTE)
 637 IMPLEMENT_ASN1_SET_OF(X509_ATTRIBUTE)