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