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