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/x509v3.h>
  71 #include <openssl/objects.h>
  72
  73 /* CRL score values */
  74
  75 /* No unhandled critical extensions */
  76
  77 #define CRL_SCORE_NOCRITICAL    0x100
  78
  79 /* certificate is within CRL scope */
  80
  81 #define CRL_SCORE_SCOPE         0x080
  82
  83 /* CRL times valid */
  84
  85 #define CRL_SCORE_TIME          0x040
  86
  87 /* Issuer name matches certificate */
  88
  89 #define CRL_SCORE_ISSUER_NAME   0x020
  90
  91 /* If this score or above CRL is probably valid */
  92
  93 #define CRL_SCORE_VALID (CRL_SCORE_NOCRITICAL|CRL_SCORE_TIME|CRL_SCORE_SCOPE)
  94
  95 /* CRL issuer is certificate issuer */
  96
  97 #define CRL_SCORE_ISSUER_CERT   0x018
  98
  99 /* CRL issuer is on certificate path */
 100
 101 #define CRL_SCORE_SAME_PATH     0x008
 102
 103 /* CRL issuer matches CRL AKID */
 104
 105 #define CRL_SCORE_AKID          0x004
 106
 107 /* Have a delta CRL with valid times */
 108
 109 #define CRL_SCORE_TIME_DELTA    0x002
 110
 111 static int null_callback(int ok,X509_STORE_CTX *e);
 112 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer);
 113 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x);
 114 static int check_chain_extensions(X509_STORE_CTX *ctx);
 115 static int check_name_constraints(X509_STORE_CTX *ctx);
 116 static int check_id(X509_STORE_CTX *ctx);
 117 static int check_trust(X509_STORE_CTX *ctx);
 118 static int check_revocation(X509_STORE_CTX *ctx);
 119 static int check_cert(X509_STORE_CTX *ctx);
 120 static int check_policy(X509_STORE_CTX *ctx);
 121
 122 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
 123                         unsigned int *preasons,
 124                         X509_CRL *crl, X509 *x);
 125 static int get_crl_delta(X509_STORE_CTX *ctx,
 126                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x);
 127 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pcrl_score,
 128                         X509_CRL *base, STACK_OF(X509_CRL) *crls);
 129 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
 130                                 X509 **pissuer, int *pcrl_score);
 131 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
 132                                 unsigned int *preasons);
 133 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x);
 134 static int check_crl_chain(X509_STORE_CTX *ctx,
 135                         STACK_OF(X509) *cert_path,
 136                         STACK_OF(X509) *crl_path);
 137
 138 static int internal_verify(X509_STORE_CTX *ctx);
 139 const char X509_version[]="X.509" OPENSSL_VERSION_PTEXT;
 140
 141
 142 static int null_callback(int ok, X509_STORE_CTX *e)
 143         {
 144         return ok;
 145         }
 146
 147 #if 0
 148 static int x509_subject_cmp(X509 **a, X509 **b)
 149         {
 150         return X509_subject_name_cmp(*a,*b);
 151         }
 152 #endif
 153
 154 /* Given a certificate try and find an exact match in the store */
 155
 156 static X509 *lookup_cert_match(X509_STORE_CTX *ctx, X509 *x)
 157         {
 158         STACK_OF(X509) *certs;
 159         X509 *xtmp;
 160         int i;
 161         /* Lookup all certs with matching subject name */
 162         certs = ctx->lookup_certs(ctx, X509_get_subject_name(x));
 163         if (certs == NULL)
 164                 return NULL;
 165         /* Look for exact match */
 166         for (i = 0; i < sk_X509_num(certs); i++)
 167                 {
 168                 xtmp = sk_X509_value(certs, i);
 169                 if (!X509_cmp(xtmp, x))
 170                         break;
 171                 }
 172         if (i < sk_X509_num(certs))
 173                 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
 174         else
 175                 xtmp = NULL;
 176         sk_X509_pop_free(certs, X509_free);
 177         return xtmp;
 178         }
 179
 180 int X509_verify_cert(X509_STORE_CTX *ctx)
 181         {
 182         X509 *x,*xtmp,*chain_ss=NULL;
 183         int bad_chain = 0;
 184         X509_VERIFY_PARAM *param = ctx->param;
 185         int depth,i,ok=0;
 186         int num;
 187         int (*cb)(int xok,X509_STORE_CTX *xctx);
 188         STACK_OF(X509) *sktmp=NULL;
 189         if (ctx->cert == NULL)
 190                 {
 191                 X509err(X509_F_X509_VERIFY_CERT,X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
 192                 return -1;
 193                 }
 194
 195         cb=ctx->verify_cb;
 196
 197         /* first we make sure the chain we are going to build is
 198          * present and that the first entry is in place */
 199         if (ctx->chain == NULL)
 200                 {
 201                 if (    ((ctx->chain=sk_X509_new_null()) == NULL) ||
 202                         (!sk_X509_push(ctx->chain,ctx->cert)))
 203                         {
 204                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 205                         goto end;
 206                         }
 207                 CRYPTO_add(&ctx->cert->references,1,CRYPTO_LOCK_X509);
 208                 ctx->last_untrusted=1;
 209                 }
 210
 211         /* We use a temporary STACK so we can chop and hack at it */
 212         if (ctx->untrusted != NULL
 213             && (sktmp=sk_X509_dup(ctx->untrusted)) == NULL)
 214                 {
 215                 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 216                 goto end;
 217                 }
 218
 219         num=sk_X509_num(ctx->chain);
 220         x=sk_X509_value(ctx->chain,num-1);
 221         depth=param->depth;
 222
 223
 224         for (;;)
 225                 {
 226                 /* If we have enough, we break */
 227                 if (depth < num) break; /* FIXME: If this happens, we should take
 228                                          * note of it and, if appropriate, use the
 229                                          * X509_V_ERR_CERT_CHAIN_TOO_LONG error
 230                                          * code later.
 231                                          */
 232
 233                 /* If we are self signed, we break */
 234                 if (ctx->check_issued(ctx, x,x)) break;
 235
 236                 /* If asked see if we can find issuer in trusted store first */
 237                 if (ctx->param->flags & X509_V_FLAG_TRUSTED_FIRST)
 238                         {
 239                         ok = ctx->get_issuer(&xtmp, ctx, x);
 240                         if (ok < 0)
 241                                 return ok;
 242                         /* If successful for now free up cert so it
 243                          * will be picked up again later.
 244                          */
 245                         if (ok > 0)
 246                                 {
 247                                 X509_free(xtmp);
 248                                 break;
 249                                 }
 250                         }
 251
 252                 /* If we were passed a cert chain, use it first */
 253                 if (ctx->untrusted != NULL)
 254                         {
 255                         xtmp=find_issuer(ctx, sktmp,x);
 256                         if (xtmp != NULL)
 257                                 {
 258                                 if (!sk_X509_push(ctx->chain,xtmp))
 259                                         {
 260                                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 261                                         goto end;
 262                                         }
 263                                 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
 264                                 (void)sk_X509_delete_ptr(sktmp,xtmp);
 265                                 ctx->last_untrusted++;
 266                                 x=xtmp;
 267                                 num++;
 268                                 /* reparse the full chain for
 269                                  * the next one */
 270                                 continue;
 271                                 }
 272                         }
 273                 break;
 274                 }
 275
 276         /* at this point, chain should contain a list of untrusted
 277          * certificates.  We now need to add at least one trusted one,
 278          * if possible, otherwise we complain. */
 279
 280         /* Examine last certificate in chain and see if it
 281          * is self signed.
 282          */
 283
 284         i=sk_X509_num(ctx->chain);
 285         x=sk_X509_value(ctx->chain,i-1);
 286         if (ctx->check_issued(ctx, x, x))
 287                 {
 288                 /* we have a self signed certificate */
 289                 if (sk_X509_num(ctx->chain) == 1)
 290                         {
 291                         /* We have a single self signed certificate: see if
 292                          * we can find it in the store. We must have an exact
 293                          * match to avoid possible impersonation.
 294                          */
 295                         ok = ctx->get_issuer(&xtmp, ctx, x);
 296                         if ((ok <= 0) || X509_cmp(x, xtmp))
 297                                 {
 298                                 ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
 299                                 ctx->current_cert=x;
 300                                 ctx->error_depth=i-1;
 301                                 if (ok == 1) X509_free(xtmp);
 302                                 bad_chain = 1;
 303                                 ok=cb(0,ctx);
 304                                 if (!ok) goto end;
 305                                 }
 306                         else
 307                                 {
 308                                 /* We have a match: replace certificate with store version
 309                                  * so we get any trust settings.
 310                                  */
 311                                 X509_free(x);
 312                                 x = xtmp;
 313                                 (void)sk_X509_set(ctx->chain, i - 1, x);
 314                                 ctx->last_untrusted=0;
 315                                 }
 316                         }
 317                 else
 318                         {
 319                         /* extract and save self signed certificate for later use */
 320                         chain_ss=sk_X509_pop(ctx->chain);
 321                         ctx->last_untrusted--;
 322                         num--;
 323                         x=sk_X509_value(ctx->chain,num-1);
 324                         }
 325                 }
 326
 327         /* We now lookup certs from the certificate store */
 328         for (;;)
 329                 {
 330                 /* If we have enough, we break */
 331                 if (depth < num) break;
 332
 333                 /* If we are self signed, we break */
 334                 if (ctx->check_issued(ctx,x,x)) break;
 335
 336                 ok = ctx->get_issuer(&xtmp, ctx, x);
 337
 338                 if (ok < 0) return ok;
 339                 if (ok == 0) break;
 340
 341                 x = xtmp;
 342                 if (!sk_X509_push(ctx->chain,x))
 343                         {
 344                         X509_free(xtmp);
 345                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 346                         return 0;
 347                         }
 348                 num++;
 349                 }
 350
 351         /* we now have our chain, lets check it... */
 352
 353         i = check_trust(ctx);
 354
 355         /* If explicitly rejected error */
 356         if (i == X509_TRUST_REJECTED)
 357                 goto end;
 358         /* If not explicitly trusted then indicate error */
 359         if (i != X509_TRUST_TRUSTED)
 360                 {
 361                 if ((chain_ss == NULL) || !ctx->check_issued(ctx, x, chain_ss))
 362                         {
 363                         if (ctx->last_untrusted >= num)
 364                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
 365                         else
 366                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
 367                         ctx->current_cert=x;
 368                         }
 369                 else
 370                         {
 371
 372                         sk_X509_push(ctx->chain,chain_ss);
 373                         num++;
 374                         ctx->last_untrusted=num;
 375                         ctx->current_cert=chain_ss;
 376                         ctx->error=X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
 377                         chain_ss=NULL;
 378                         }
 379
 380                 ctx->error_depth=num-1;
 381                 bad_chain = 1;
 382                 ok=cb(0,ctx);
 383                 if (!ok) goto end;
 384                 }
 385
 386         /* We have the chain complete: now we need to check its purpose */
 387         ok = check_chain_extensions(ctx);
 388
 389         if (!ok) goto end;
 390
 391         /* Check name constraints */
 392
 393         ok = check_name_constraints(ctx);
 394
 395         if (!ok) goto end;
 396
 397         ok = check_id(ctx);
 398
 399         if (!ok) goto end;
 400
 401         /* We may as well copy down any DSA parameters that are required */
 402         X509_get_pubkey_parameters(NULL,ctx->chain);
 403
 404         /* Check revocation status: we do this after copying parameters
 405          * because they may be needed for CRL signature verification.
 406          */
 407
 408         ok = ctx->check_revocation(ctx);
 409         if(!ok) goto end;
 410
 411         i = X509_chain_check_suiteb(&ctx->error_depth, NULL, ctx->chain,
 412                                                         ctx->param->flags);
 413         if (i != X509_V_OK)
 414                 {
 415                 ctx->error = i;
 416                 ctx->current_cert = sk_X509_value(ctx->chain, ctx->error_depth);
 417                 ok = cb(0, ctx);
 418                 if (!ok)
 419                         goto end;
 420                 }
 421
 422         /* At this point, we have a chain and need to verify it */
 423         if (ctx->verify != NULL)
 424                 ok=ctx->verify(ctx);
 425         else
 426                 ok=internal_verify(ctx);
 427         if(!ok) goto end;
 428
 429 #ifndef OPENSSL_NO_RFC3779
 430         /* RFC 3779 path validation, now that CRL check has been done */
 431         ok = v3_asid_validate_path(ctx);
 432         if (!ok) goto end;
 433         ok = v3_addr_validate_path(ctx);
 434         if (!ok) goto end;
 435 #endif
 436
 437         /* If we get this far evaluate policies */
 438         if (!bad_chain && (ctx->param->flags & X509_V_FLAG_POLICY_CHECK))
 439                 ok = ctx->check_policy(ctx);
 440         if(!ok) goto end;
 441         if (0)
 442                 {
 443 end:
 444                 X509_get_pubkey_parameters(NULL,ctx->chain);
 445                 }
 446         if (sktmp != NULL) sk_X509_free(sktmp);
 447         if (chain_ss != NULL) X509_free(chain_ss);
 448         return ok;
 449         }
 450
 451
 452 /* Given a STACK_OF(X509) find the issuer of cert (if any)
 453  */
 454
 455 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x)
 456 {
 457         int i;
 458         X509 *issuer;
 459         for (i = 0; i < sk_X509_num(sk); i++)
 460                 {
 461                 issuer = sk_X509_value(sk, i);
 462                 if (ctx->check_issued(ctx, x, issuer))
 463                         return issuer;
 464                 }
 465         return NULL;
 466 }
 467
 468 /* Given a possible certificate and issuer check them */
 469
 470 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer)
 471 {
 472         int ret;
 473         ret = X509_check_issued(issuer, x);
 474         if (ret == X509_V_OK)
 475                 return 1;
 476         /* If we haven't asked for issuer errors don't set ctx */
 477         if (!(ctx->param->flags & X509_V_FLAG_CB_ISSUER_CHECK))
 478                 return 0;
 479
 480         ctx->error = ret;
 481         ctx->current_cert = x;
 482         ctx->current_issuer = issuer;
 483         return ctx->verify_cb(0, ctx);
 484         return 0;
 485 }
 486
 487 /* Alternative lookup method: look from a STACK stored in other_ctx */
 488
 489 static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
 490 {
 491         *issuer = find_issuer(ctx, ctx->other_ctx, x);
 492         if (*issuer)
 493                 {
 494                 CRYPTO_add(&(*issuer)->references,1,CRYPTO_LOCK_X509);
 495                 return 1;
 496                 }
 497         else
 498                 return 0;
 499 }
 500
 501
 502 /* Check a certificate chains extensions for consistency
 503  * with the supplied purpose
 504  */
 505
 506 static int check_chain_extensions(X509_STORE_CTX *ctx)
 507 {
 508 #ifdef OPENSSL_NO_CHAIN_VERIFY
 509         return 1;
 510 #else
 511         int i, ok=0, must_be_ca, plen = 0;
 512         X509 *x;
 513         int (*cb)(int xok,X509_STORE_CTX *xctx);
 514         int proxy_path_length = 0;
 515         int purpose;
 516         int allow_proxy_certs;
 517         cb=ctx->verify_cb;
 518
 519         /* must_be_ca can have 1 of 3 values:
 520            -1: we accept both CA and non-CA certificates, to allow direct
 521                use of self-signed certificates (which are marked as CA).
 522            0:  we only accept non-CA certificates.  This is currently not
 523                used, but the possibility is present for future extensions.
 524            1:  we only accept CA certificates.  This is currently used for
 525                all certificates in the chain except the leaf certificate.
 526         */
 527         must_be_ca = -1;
 528
 529         /* CRL path validation */
 530         if (ctx->parent)
 531                 {
 532                 allow_proxy_certs = 0;
 533                 purpose = X509_PURPOSE_CRL_SIGN;
 534                 }
 535         else
 536                 {
 537                 allow_proxy_certs =
 538                         !!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
 539                 /* A hack to keep people who don't want to modify their
 540                    software happy */
 541                 if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
 542                         allow_proxy_certs = 1;
 543                 purpose = ctx->param->purpose;
 544                 }
 545
 546         /* Check all untrusted certificates */
 547         for (i = 0; i < ctx->last_untrusted; i++)
 548                 {
 549                 int ret;
 550                 x = sk_X509_value(ctx->chain, i);
 551                 if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
 552                         && (x->ex_flags & EXFLAG_CRITICAL))
 553                         {
 554                         ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;
 555                         ctx->error_depth = i;
 556                         ctx->current_cert = x;
 557                         ok=cb(0,ctx);
 558                         if (!ok) goto end;
 559                         }
 560                 if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY))
 561                         {
 562                         ctx->error = X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED;
 563                         ctx->error_depth = i;
 564                         ctx->current_cert = x;
 565                         ok=cb(0,ctx);
 566                         if (!ok) goto end;
 567                         }
 568                 ret = X509_check_ca(x);
 569                 switch(must_be_ca)
 570                         {
 571                 case -1:
 572                         if ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 573                                 && (ret != 1) && (ret != 0))
 574                                 {
 575                                 ret = 0;
 576                                 ctx->error = X509_V_ERR_INVALID_CA;
 577                                 }
 578                         else
 579                                 ret = 1;
 580                         break;
 581                 case 0:
 582                         if (ret != 0)
 583                                 {
 584                                 ret = 0;
 585                                 ctx->error = X509_V_ERR_INVALID_NON_CA;
 586                                 }
 587                         else
 588                                 ret = 1;
 589                         break;
 590                 default:
 591                         if ((ret == 0)
 592                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 593                                         && (ret != 1)))
 594                                 {
 595                                 ret = 0;
 596                                 ctx->error = X509_V_ERR_INVALID_CA;
 597                                 }
 598                         else
 599                                 ret = 1;
 600                         break;
 601                         }
 602                 if (ret == 0)
 603                         {
 604                         ctx->error_depth = i;
 605                         ctx->current_cert = x;
 606                         ok=cb(0,ctx);
 607                         if (!ok) goto end;
 608                         }
 609                 if (ctx->param->purpose > 0)
 610                         {
 611                         ret = X509_check_purpose(x, purpose, must_be_ca > 0);
 612                         if ((ret == 0)
 613                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 614                                         && (ret != 1)))
 615                                 {
 616                                 ctx->error = X509_V_ERR_INVALID_PURPOSE;
 617                                 ctx->error_depth = i;
 618                                 ctx->current_cert = x;
 619                                 ok=cb(0,ctx);
 620                                 if (!ok) goto end;
 621                                 }
 622                         }
 623                 /* Check pathlen if not self issued */
 624                 if ((i > 1) && !(x->ex_flags & EXFLAG_SI)
 625                            && (x->ex_pathlen != -1)
 626                            && (plen > (x->ex_pathlen + proxy_path_length + 1)))
 627                         {
 628                         ctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;
 629                         ctx->error_depth = i;
 630                         ctx->current_cert = x;
 631                         ok=cb(0,ctx);
 632                         if (!ok) goto end;
 633                         }
 634                 /* Increment path length if not self issued */
 635                 if (!(x->ex_flags & EXFLAG_SI))
 636                         plen++;
 637                 /* If this certificate is a proxy certificate, the next
 638                    certificate must be another proxy certificate or a EE
 639                    certificate.  If not, the next certificate must be a
 640                    CA certificate.  */
 641                 if (x->ex_flags & EXFLAG_PROXY)
 642                         {
 643                         if (x->ex_pcpathlen != -1 && i > x->ex_pcpathlen)
 644                                 {
 645                                 ctx->error =
 646                                         X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED;
 647                                 ctx->error_depth = i;
 648                                 ctx->current_cert = x;
 649                                 ok=cb(0,ctx);
 650                                 if (!ok) goto end;
 651                                 }
 652                         proxy_path_length++;
 653                         must_be_ca = 0;
 654                         }
 655                 else
 656                         must_be_ca = 1;
 657                 }
 658         ok = 1;
 659  end:
 660         return ok;
 661 #endif
 662 }
 663
 664 static int check_name_constraints(X509_STORE_CTX *ctx)
 665         {
 666         X509 *x;
 667         int i, j, rv;
 668         /* Check name constraints for all certificates */
 669         for (i = sk_X509_num(ctx->chain) - 1; i >= 0; i--)
 670                 {
 671                 x = sk_X509_value(ctx->chain, i);
 672                 /* Ignore self issued certs unless last in chain */
 673                 if (i && (x->ex_flags & EXFLAG_SI))
 674                         continue;
 675                 /* Check against constraints for all certificates higher in
 676                  * chain including trust anchor. Trust anchor not strictly
 677                  * speaking needed but if it includes constraints it is to be
 678                  * assumed it expects them to be obeyed.
 679                  */
 680                 for (j = sk_X509_num(ctx->chain) - 1; j > i; j--)
 681                         {
 682                         NAME_CONSTRAINTS *nc = sk_X509_value(ctx->chain, j)->nc;
 683                         if (nc)
 684                                 {
 685                                 rv = NAME_CONSTRAINTS_check(x, nc);
 686                                 if (rv != X509_V_OK)
 687                                         {
 688                                         ctx->error = rv;
 689                                         ctx->error_depth = i;
 690                                         ctx->current_cert = x;
 691                                         if (!ctx->verify_cb(0,ctx))
 692                                                 return 0;
 693                                         }
 694                                 }
 695                         }
 696                 }
 697         return 1;
 698         }
 699
 700 static int check_id_error(X509_STORE_CTX *ctx, int errcode)
 701         {
 702         ctx->error = errcode;
 703         ctx->current_cert = ctx->cert;
 704         ctx->error_depth = 0;
 705         return ctx->verify_cb(0, ctx);
 706         }
 707
 708 static int check_id(X509_STORE_CTX *ctx)
 709         {
 710         X509_VERIFY_PARAM *vpm = ctx->param;
 711         X509 *x = ctx->cert;
 712         if (vpm->host && !X509_check_host(x, vpm->host, vpm->hostlen, 0))
 713                 {
 714                 if (!check_id_error(ctx, X509_V_ERR_HOSTNAME_MISMATCH))
 715                         return 0;
 716                 }
 717         if (vpm->email && !X509_check_email(x, vpm->email, vpm->emaillen, 0))
 718                 {
 719                 if (!check_id_error(ctx, X509_V_ERR_EMAIL_MISMATCH))
 720                         return 0;
 721                 }
 722         if (vpm->ip && !X509_check_ip(x, vpm->ip, vpm->iplen, 0))
 723                 {
 724                 if (!check_id_error(ctx, X509_V_ERR_IP_ADDRESS_MISMATCH))
 725                         return 0;
 726                 }
 727         return 1;
 728         }
 729
 730 static int check_trust(X509_STORE_CTX *ctx)
 731 {
 732         int i, ok;
 733         X509 *x = NULL;
 734         int (*cb)(int xok,X509_STORE_CTX *xctx);
 735         cb=ctx->verify_cb;
 736         /* Check all trusted certificates in chain */
 737         for (i = ctx->last_untrusted; i < sk_X509_num(ctx->chain); i++)
 738                 {
 739                 x = sk_X509_value(ctx->chain, i);
 740                 ok = X509_check_trust(x, ctx->param->trust, 0);
 741                 /* If explicitly trusted return trusted */
 742                 if (ok == X509_TRUST_TRUSTED)
 743                         return X509_TRUST_TRUSTED;
 744                 /* If explicitly rejected notify callback and reject if
 745                  * not overridden.
 746                  */
 747                 if (ok == X509_TRUST_REJECTED)
 748                         {
 749                         ctx->error_depth = i;
 750                         ctx->current_cert = x;
 751                         ctx->error = X509_V_ERR_CERT_REJECTED;
 752                         ok = cb(0, ctx);
 753                         if (!ok)
 754                                 return X509_TRUST_REJECTED;
 755                         }
 756                 }
 757         /* If we accept partial chains and have at least one trusted
 758          * certificate return success.
 759          */
 760         if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN)
 761                 {
 762                 if (ctx->last_untrusted < sk_X509_num(ctx->chain))
 763                         return X509_TRUST_TRUSTED;
 764                 if (sk_X509_num(ctx->chain) == 1)
 765                         {
 766                         X509 *mx;
 767                         x = sk_X509_value(ctx->chain, 0);
 768                         mx = lookup_cert_match(ctx, x);
 769                         if (mx)
 770                                 {
 771                                 (void)sk_X509_set(ctx->chain, 0, mx);
 772                                 X509_free(x);
 773                                 ctx->last_untrusted = 0;
 774                                 return X509_TRUST_TRUSTED;
 775                                 }
 776                         }
 777                 }
 778
 779         /* If no trusted certs in chain at all return untrusted and
 780          * allow standard (no issuer cert) etc errors to be indicated.
 781          */
 782         return X509_TRUST_UNTRUSTED;
 783 }
 784
 785 static int check_revocation(X509_STORE_CTX *ctx)
 786         {
 787         int i, last, ok;
 788         if (!(ctx->param->flags & X509_V_FLAG_CRL_CHECK))
 789                 return 1;
 790         if (ctx->param->flags & X509_V_FLAG_CRL_CHECK_ALL)
 791                 last = sk_X509_num(ctx->chain) - 1;
 792         else
 793                 {
 794                 /* If checking CRL paths this isn't the EE certificate */
 795                 if (ctx->parent)
 796                         return 1;
 797                 last = 0;
 798                 }
 799         for(i = 0; i <= last; i++)
 800                 {
 801                 ctx->error_depth = i;
 802                 ok = check_cert(ctx);
 803                 if (!ok) return ok;
 804                 }
 805         return 1;
 806         }
 807
 808 static int check_cert(X509_STORE_CTX *ctx)
 809         {
 810         X509_CRL *crl = NULL, *dcrl = NULL;
 811         X509 *x;
 812         int ok, cnum;
 813         cnum = ctx->error_depth;
 814         x = sk_X509_value(ctx->chain, cnum);
 815         ctx->current_cert = x;
 816         ctx->current_issuer = NULL;
 817         ctx->current_crl_score = 0;
 818         ctx->current_reasons = 0;
 819         while (ctx->current_reasons != CRLDP_ALL_REASONS)
 820                 {
 821                 /* Try to retrieve relevant CRL */
 822                 if (ctx->get_crl)
 823                         ok = ctx->get_crl(ctx, &crl, x);
 824                 else
 825                         ok = get_crl_delta(ctx, &crl, &dcrl, x);
 826                 /* If error looking up CRL, nothing we can do except
 827                  * notify callback
 828                  */
 829                 if(!ok)
 830                         {
 831                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
 832                         ok = ctx->verify_cb(0, ctx);
 833                         goto err;
 834                         }
 835                 ctx->current_crl = crl;
 836                 ok = ctx->check_crl(ctx, crl);
 837                 if (!ok)
 838                         goto err;
 839
 840                 if (dcrl)
 841                         {
 842                         ok = ctx->check_crl(ctx, dcrl);
 843                         if (!ok)
 844                                 goto err;
 845                         ok = ctx->cert_crl(ctx, dcrl, x);
 846                         if (!ok)
 847                                 goto err;
 848                         }
 849                 else
 850                         ok = 1;
 851
 852                 /* Don't look in full CRL if delta reason is removefromCRL */
 853                 if (ok != 2)
 854                         {
 855                         ok = ctx->cert_crl(ctx, crl, x);
 856                         if (!ok)
 857                                 goto err;
 858                         }
 859
 860                 X509_CRL_free(crl);
 861                 X509_CRL_free(dcrl);
 862                 crl = NULL;
 863                 dcrl = NULL;
 864                 }
 865         err:
 866         X509_CRL_free(crl);
 867         X509_CRL_free(dcrl);
 868
 869         ctx->current_crl = NULL;
 870         return ok;
 871
 872         }
 873
 874 /* Check CRL times against values in X509_STORE_CTX */
 875
 876 static int check_crl_time(X509_STORE_CTX *ctx, X509_CRL *crl, int notify)
 877         {
 878         time_t *ptime;
 879         int i;
 880         if (notify)
 881                 ctx->current_crl = crl;
 882         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
 883                 ptime = &ctx->param->check_time;
 884         else
 885                 ptime = NULL;
 886
 887         i=X509_cmp_time(X509_CRL_get_lastUpdate(crl), ptime);
 888         if (i == 0)
 889                 {
 890                 if (!notify)
 891                         return 0;
 892                 ctx->error=X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD;
 893                 if (!ctx->verify_cb(0, ctx))
 894                         return 0;
 895                 }
 896
 897         if (i > 0)
 898                 {
 899                 if (!notify)
 900                         return 0;
 901                 ctx->error=X509_V_ERR_CRL_NOT_YET_VALID;
 902                 if (!ctx->verify_cb(0, ctx))
 903                         return 0;
 904                 }
 905
 906         if(X509_CRL_get_nextUpdate(crl))
 907                 {
 908                 i=X509_cmp_time(X509_CRL_get_nextUpdate(crl), ptime);
 909
 910                 if (i == 0)
 911                         {
 912                         if (!notify)
 913                                 return 0;
 914                         ctx->error=X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD;
 915                         if (!ctx->verify_cb(0, ctx))
 916                                 return 0;
 917                         }
 918                 /* Ignore expiry of base CRL is delta is valid */
 919                 if ((i < 0) && !(ctx->current_crl_score & CRL_SCORE_TIME_DELTA))
 920                         {
 921                         if (!notify)
 922                                 return 0;
 923                         ctx->error=X509_V_ERR_CRL_HAS_EXPIRED;
 924                         if (!ctx->verify_cb(0, ctx))
 925                                 return 0;
 926                         }
 927                 }
 928
 929         if (notify)
 930                 ctx->current_crl = NULL;
 931
 932         return 1;
 933         }
 934
 935 static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl,
 936                         X509 **pissuer, int *pscore, unsigned int *preasons,
 937                         STACK_OF(X509_CRL) *crls)
 938         {
 939         int i, crl_score, best_score = *pscore;
 940         unsigned int reasons, best_reasons = 0;
 941         X509 *x = ctx->current_cert;
 942         X509_CRL *crl, *best_crl = NULL;
 943         X509 *crl_issuer = NULL, *best_crl_issuer = NULL;
 944
 945         for (i = 0; i < sk_X509_CRL_num(crls); i++)
 946                 {
 947                 crl = sk_X509_CRL_value(crls, i);
 948                 reasons = *preasons;
 949                 crl_score = get_crl_score(ctx, &crl_issuer, &reasons, crl, x);
 950
 951                 if (crl_score > best_score)
 952                         {
 953                         best_crl = crl;
 954                         best_crl_issuer = crl_issuer;
 955                         best_score = crl_score;
 956                         best_reasons = reasons;
 957                         }
 958                 }
 959
 960         if (best_crl)
 961                 {
 962                 if (*pcrl)
 963                         X509_CRL_free(*pcrl);
 964                 *pcrl = best_crl;
 965                 *pissuer = best_crl_issuer;
 966                 *pscore = best_score;
 967                 *preasons = best_reasons;
 968                 CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509_CRL);
 969                 if (*pdcrl)
 970                         {
 971                         X509_CRL_free(*pdcrl);
 972                         *pdcrl = NULL;
 973                         }
 974                 get_delta_sk(ctx, pdcrl, pscore, best_crl, crls);
 975                 }
 976
 977         if (best_score >= CRL_SCORE_VALID)
 978                 return 1;
 979
 980         return 0;
 981         }
 982
 983 /* Compare two CRL extensions for delta checking purposes. They should be
 984  * both present or both absent. If both present all fields must be identical.
 985  */
 986
 987 static int crl_extension_match(X509_CRL *a, X509_CRL *b, int nid)
 988         {
 989         ASN1_OCTET_STRING *exta, *extb;
 990         int i;
 991         i = X509_CRL_get_ext_by_NID(a, nid, -1);
 992         if (i >= 0)
 993                 {
 994                 /* Can't have multiple occurrences */
 995                 if (X509_CRL_get_ext_by_NID(a, nid, i) != -1)
 996                         return 0;
 997                 exta = X509_EXTENSION_get_data(X509_CRL_get_ext(a, i));
 998                 }
 999         else
1000                 exta = NULL;
1001
1002         i = X509_CRL_get_ext_by_NID(b, nid, -1);
1003
1004         if (i >= 0)
1005                 {
1006
1007                 if (X509_CRL_get_ext_by_NID(b, nid, i) != -1)
1008                         return 0;
1009                 extb = X509_EXTENSION_get_data(X509_CRL_get_ext(b, i));
1010                 }
1011         else
1012                 extb = NULL;
1013
1014         if (!exta && !extb)
1015                 return 1;
1016
1017         if (!exta || !extb)
1018                 return 0;
1019
1020
1021         if (ASN1_OCTET_STRING_cmp(exta, extb))
1022                 return 0;
1023
1024         return 1;
1025         }
1026
1027 /* See if a base and delta are compatible */
1028
1029 static int check_delta_base(X509_CRL *delta, X509_CRL *base)
1030         {
1031         /* Delta CRL must be a delta */
1032         if (!delta->base_crl_number)
1033                         return 0;
1034         /* Base must have a CRL number */
1035         if (!base->crl_number)
1036                         return 0;
1037         /* Issuer names must match */
1038         if (X509_NAME_cmp(X509_CRL_get_issuer(base),
1039                                 X509_CRL_get_issuer(delta)))
1040                 return 0;
1041         /* AKID and IDP must match */
1042         if (!crl_extension_match(delta, base, NID_authority_key_identifier))
1043                         return 0;
1044         if (!crl_extension_match(delta, base, NID_issuing_distribution_point))
1045                         return 0;
1046         /* Delta CRL base number must not exceed Full CRL number. */
1047         if (ASN1_INTEGER_cmp(delta->base_crl_number, base->crl_number) > 0)
1048                         return 0;
1049         /* Delta CRL number must exceed full CRL number */
1050         if (ASN1_INTEGER_cmp(delta->crl_number, base->crl_number) > 0)
1051                         return 1;
1052         return 0;
1053         }
1054
1055 /* For a given base CRL find a delta... maybe extend to delta scoring
1056  * or retrieve a chain of deltas...
1057  */
1058
1059 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pscore,
1060                         X509_CRL *base, STACK_OF(X509_CRL) *crls)
1061         {
1062         X509_CRL *delta;
1063         int i;
1064         if (!(ctx->param->flags & X509_V_FLAG_USE_DELTAS))
1065                 return;
1066         if (!((ctx->current_cert->ex_flags | base->flags) & EXFLAG_FRESHEST))
1067                 return;
1068         for (i = 0; i < sk_X509_CRL_num(crls); i++)
1069                 {
1070                 delta = sk_X509_CRL_value(crls, i);
1071                 if (check_delta_base(delta, base))
1072                         {
1073                         if (check_crl_time(ctx, delta, 0))
1074                                 *pscore |= CRL_SCORE_TIME_DELTA;
1075                         CRYPTO_add(&delta->references, 1, CRYPTO_LOCK_X509_CRL);
1076                         *dcrl = delta;
1077                         return;
1078                         }
1079                 }
1080         *dcrl = NULL;
1081         }
1082
1083 /* For a given CRL return how suitable it is for the supplied certificate 'x'.
1084  * The return value is a mask of several criteria.
1085  * If the issuer is not the certificate issuer this is returned in *pissuer.
1086  * The reasons mask is also used to determine if the CRL is suitable: if
1087  * no new reasons the CRL is rejected, otherwise reasons is updated.
1088  */
1089
1090 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
1091                         unsigned int *preasons,
1092                         X509_CRL *crl, X509 *x)
1093         {
1094
1095         int crl_score = 0;
1096         unsigned int tmp_reasons = *preasons, crl_reasons;
1097
1098         /* First see if we can reject CRL straight away */
1099
1100         /* Invalid IDP cannot be processed */
1101         if (crl->idp_flags & IDP_INVALID)
1102                 return 0;
1103         /* Reason codes or indirect CRLs need extended CRL support */
1104         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1105                 {
1106                 if (crl->idp_flags & (IDP_INDIRECT | IDP_REASONS))
1107                         return 0;
1108                 }
1109         else if (crl->idp_flags & IDP_REASONS)
1110                 {
1111                 /* If no new reasons reject */
1112                 if (!(crl->idp_reasons & ~tmp_reasons))
1113                         return 0;
1114                 }
1115         /* Don't process deltas at this stage */
1116         else if (crl->base_crl_number)
1117                 return 0;
1118         /* If issuer name doesn't match certificate need indirect CRL */
1119         if (X509_NAME_cmp(X509_get_issuer_name(x), X509_CRL_get_issuer(crl)))
1120                 {
1121                 if (!(crl->idp_flags & IDP_INDIRECT))
1122                         return 0;
1123                 }
1124         else
1125                 crl_score |= CRL_SCORE_ISSUER_NAME;
1126
1127         if (!(crl->flags & EXFLAG_CRITICAL))
1128                 crl_score |= CRL_SCORE_NOCRITICAL;
1129
1130         /* Check expiry */
1131         if (check_crl_time(ctx, crl, 0))
1132                 crl_score |= CRL_SCORE_TIME;
1133
1134         /* Check authority key ID and locate certificate issuer */
1135         crl_akid_check(ctx, crl, pissuer, &crl_score);
1136
1137         /* If we can't locate certificate issuer at this point forget it */
1138
1139         if (!(crl_score & CRL_SCORE_AKID))
1140                 return 0;
1141
1142         /* Check cert for matching CRL distribution points */
1143
1144         if (crl_crldp_check(x, crl, crl_score, &crl_reasons))
1145                 {
1146                 /* If no new reasons reject */
1147                 if (!(crl_reasons & ~tmp_reasons))
1148                         return 0;
1149                 tmp_reasons |= crl_reasons;
1150                 crl_score |= CRL_SCORE_SCOPE;
1151                 }
1152
1153         *preasons = tmp_reasons;
1154
1155         return crl_score;
1156
1157         }
1158
1159 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
1160                                 X509 **pissuer, int *pcrl_score)
1161         {
1162         X509 *crl_issuer = NULL;
1163         X509_NAME *cnm = X509_CRL_get_issuer(crl);
1164         int cidx = ctx->error_depth;
1165         int i;
1166
1167         if (cidx != sk_X509_num(ctx->chain) - 1)
1168                 cidx++;
1169
1170         crl_issuer = sk_X509_value(ctx->chain, cidx);
1171
1172         if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1173                 {
1174                 if (*pcrl_score & CRL_SCORE_ISSUER_NAME)
1175                         {
1176                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_ISSUER_CERT;
1177                         *pissuer = crl_issuer;
1178                         return;
1179                         }
1180                 }
1181
1182         for (cidx++; cidx < sk_X509_num(ctx->chain); cidx++)
1183                 {
1184                 crl_issuer = sk_X509_value(ctx->chain, cidx);
1185                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1186                         continue;
1187                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1188                         {
1189                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_SAME_PATH;
1190                         *pissuer = crl_issuer;
1191                         return;
1192                         }
1193                 }
1194
1195         /* Anything else needs extended CRL support */
1196
1197         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1198                 return;
1199
1200         /* Otherwise the CRL issuer is not on the path. Look for it in the
1201          * set of untrusted certificates.
1202          */
1203         for (i = 0; i < sk_X509_num(ctx->untrusted); i++)
1204                 {
1205                 crl_issuer = sk_X509_value(ctx->untrusted, i);
1206                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1207                         continue;
1208                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1209                         {
1210                         *pissuer = crl_issuer;
1211                         *pcrl_score |= CRL_SCORE_AKID;
1212                         return;
1213                         }
1214                 }
1215         }
1216
1217 /* Check the path of a CRL issuer certificate. This creates a new
1218  * X509_STORE_CTX and populates it with most of the parameters from the
1219  * parent. This could be optimised somewhat since a lot of path checking
1220  * will be duplicated by the parent, but this will rarely be used in
1221  * practice.
1222  */
1223
1224 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x)
1225         {
1226         X509_STORE_CTX crl_ctx;
1227         int ret;
1228         /* Don't allow recursive CRL path validation */
1229         if (ctx->parent)
1230                 return 0;
1231         if (!X509_STORE_CTX_init(&crl_ctx, ctx->ctx, x, ctx->untrusted))
1232                 return -1;
1233
1234         crl_ctx.crls = ctx->crls;
1235         /* Copy verify params across */
1236         X509_STORE_CTX_set0_param(&crl_ctx, ctx->param);
1237
1238         crl_ctx.parent = ctx;
1239         crl_ctx.verify_cb = ctx->verify_cb;
1240
1241         /* Verify CRL issuer */
1242         ret = X509_verify_cert(&crl_ctx);
1243
1244         if (ret <= 0)
1245                 goto err;
1246
1247         /* Check chain is acceptable */
1248
1249         ret = check_crl_chain(ctx, ctx->chain, crl_ctx.chain);
1250         err:
1251         X509_STORE_CTX_cleanup(&crl_ctx);
1252         return ret;
1253         }
1254
1255 /* RFC3280 says nothing about the relationship between CRL path
1256  * and certificate path, which could lead to situations where a
1257  * certificate could be revoked or validated by a CA not authorised
1258  * to do so. RFC5280 is more strict and states that the two paths must
1259  * end in the same trust anchor, though some discussions remain...
1260  * until this is resolved we use the RFC5280 version
1261  */
1262
1263 static int check_crl_chain(X509_STORE_CTX *ctx,
1264                         STACK_OF(X509) *cert_path,
1265                         STACK_OF(X509) *crl_path)
1266         {
1267         X509 *cert_ta, *crl_ta;
1268         cert_ta = sk_X509_value(cert_path, sk_X509_num(cert_path) - 1);
1269         crl_ta = sk_X509_value(crl_path, sk_X509_num(crl_path) - 1);
1270         if (!X509_cmp(cert_ta, crl_ta))
1271                 return 1;
1272         return 0;
1273         }
1274
1275 /* Check for match between two dist point names: three separate cases.
1276  * 1. Both are relative names and compare X509_NAME types.
1277  * 2. One full, one relative. Compare X509_NAME to GENERAL_NAMES.
1278  * 3. Both are full names and compare two GENERAL_NAMES.
1279  * 4. One is NULL: automatic match.
1280  */
1281
1282
1283 static int idp_check_dp(DIST_POINT_NAME *a, DIST_POINT_NAME *b)
1284         {
1285         X509_NAME *nm = NULL;
1286         GENERAL_NAMES *gens = NULL;
1287         GENERAL_NAME *gena, *genb;
1288         int i, j;
1289         if (!a || !b)
1290                 return 1;
1291         if (a->type == 1)
1292                 {
1293                 if (!a->dpname)
1294                         return 0;
1295                 /* Case 1: two X509_NAME */
1296                 if (b->type == 1)
1297                         {
1298                         if (!b->dpname)
1299                                 return 0;
1300                         if (!X509_NAME_cmp(a->dpname, b->dpname))
1301                                 return 1;
1302                         else
1303                                 return 0;
1304                         }
1305                 /* Case 2: set name and GENERAL_NAMES appropriately */
1306                 nm = a->dpname;
1307                 gens = b->name.fullname;
1308                 }
1309         else if (b->type == 1)
1310                 {
1311                 if (!b->dpname)
1312                         return 0;
1313                 /* Case 2: set name and GENERAL_NAMES appropriately */
1314                 gens = a->name.fullname;
1315                 nm = b->dpname;
1316                 }
1317
1318         /* Handle case 2 with one GENERAL_NAMES and one X509_NAME */
1319         if (nm)
1320                 {
1321                 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++)
1322                         {
1323                         gena = sk_GENERAL_NAME_value(gens, i);
1324                         if (gena->type != GEN_DIRNAME)
1325                                 continue;
1326                         if (!X509_NAME_cmp(nm, gena->d.directoryName))
1327                                 return 1;
1328                         }
1329                 return 0;
1330                 }
1331
1332         /* Else case 3: two GENERAL_NAMES */
1333
1334         for (i = 0; i < sk_GENERAL_NAME_num(a->name.fullname); i++)
1335                 {
1336                 gena = sk_GENERAL_NAME_value(a->name.fullname, i);
1337                 for (j = 0; j < sk_GENERAL_NAME_num(b->name.fullname); j++)
1338                         {
1339                         genb = sk_GENERAL_NAME_value(b->name.fullname, j);
1340                         if (!GENERAL_NAME_cmp(gena, genb))
1341                                 return 1;
1342                         }
1343                 }
1344
1345         return 0;
1346
1347         }
1348
1349 static int crldp_check_crlissuer(DIST_POINT *dp, X509_CRL *crl, int crl_score)
1350         {
1351         int i;
1352         X509_NAME *nm = X509_CRL_get_issuer(crl);
1353         /* If no CRLissuer return is successful iff don't need a match */
1354         if (!dp->CRLissuer)
1355                 return !!(crl_score & CRL_SCORE_ISSUER_NAME);
1356         for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++)
1357                 {
1358                 GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
1359                 if (gen->type != GEN_DIRNAME)
1360                         continue;
1361                 if (!X509_NAME_cmp(gen->d.directoryName, nm))
1362                         return 1;
1363                 }
1364         return 0;
1365         }
1366
1367 /* Check CRLDP and IDP */
1368
1369 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
1370                                 unsigned int *preasons)
1371         {
1372         int i;
1373         if (crl->idp_flags & IDP_ONLYATTR)
1374                 return 0;
1375         if (x->ex_flags & EXFLAG_CA)
1376                 {
1377                 if (crl->idp_flags & IDP_ONLYUSER)
1378                         return 0;
1379                 }
1380         else
1381                 {
1382                 if (crl->idp_flags & IDP_ONLYCA)
1383                         return 0;
1384                 }
1385         *preasons = crl->idp_reasons;
1386         for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++)
1387                 {
1388                 DIST_POINT *dp = sk_DIST_POINT_value(x->crldp, i);
1389                 if (crldp_check_crlissuer(dp, crl, crl_score))
1390                         {
1391                         if (!crl->idp ||
1392                              idp_check_dp(dp->distpoint, crl->idp->distpoint))
1393                                 {
1394                                 *preasons &= dp->dp_reasons;
1395                                 return 1;
1396                                 }
1397                         }
1398                 }
1399         if ((!crl->idp || !crl->idp->distpoint) && (crl_score & CRL_SCORE_ISSUER_NAME))
1400                 return 1;
1401         return 0;
1402         }
1403
1404 /* Retrieve CRL corresponding to current certificate.
1405  * If deltas enabled try to find a delta CRL too
1406  */
1407
1408 static int get_crl_delta(X509_STORE_CTX *ctx,
1409                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)
1410         {
1411         int ok;
1412         X509 *issuer = NULL;
1413         int crl_score = 0;
1414         unsigned int reasons;
1415         X509_CRL *crl = NULL, *dcrl = NULL;
1416         STACK_OF(X509_CRL) *skcrl;
1417         X509_NAME *nm = X509_get_issuer_name(x);
1418         reasons = ctx->current_reasons;
1419         ok = get_crl_sk(ctx, &crl, &dcrl,
1420                                 &issuer, &crl_score, &reasons, ctx->crls);
1421
1422         if (ok)
1423                 goto done;
1424
1425         /* Lookup CRLs from store */
1426
1427         skcrl = ctx->lookup_crls(ctx, nm);
1428
1429         /* If no CRLs found and a near match from get_crl_sk use that */
1430         if (!skcrl && crl)
1431                 goto done;
1432
1433         get_crl_sk(ctx, &crl, &dcrl, &issuer, &crl_score, &reasons, skcrl);
1434
1435         sk_X509_CRL_pop_free(skcrl, X509_CRL_free);
1436
1437         done:
1438
1439         /* If we got any kind of CRL use it and return success */
1440         if (crl)
1441                 {
1442                 ctx->current_issuer = issuer;
1443                 ctx->current_crl_score = crl_score;
1444                 ctx->current_reasons = reasons;
1445                 *pcrl = crl;
1446                 *pdcrl = dcrl;
1447                 return 1;
1448                 }
1449
1450         return 0;
1451         }
1452
1453 /* Check CRL validity */
1454 static int check_crl(X509_STORE_CTX *ctx, X509_CRL *crl)
1455         {
1456         X509 *issuer = NULL;
1457         EVP_PKEY *ikey = NULL;
1458         int ok = 0, chnum, cnum;
1459         cnum = ctx->error_depth;
1460         chnum = sk_X509_num(ctx->chain) - 1;
1461         /* if we have an alternative CRL issuer cert use that */
1462         if (ctx->current_issuer)
1463                 issuer = ctx->current_issuer;
1464
1465         /* Else find CRL issuer: if not last certificate then issuer
1466          * is next certificate in chain.
1467          */
1468         else if (cnum < chnum)
1469                 issuer = sk_X509_value(ctx->chain, cnum + 1);
1470         else
1471                 {
1472                 issuer = sk_X509_value(ctx->chain, chnum);
1473                 /* If not self signed, can't check signature */
1474                 if(!ctx->check_issued(ctx, issuer, issuer))
1475                         {
1476                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER;
1477                         ok = ctx->verify_cb(0, ctx);
1478                         if(!ok) goto err;
1479                         }
1480                 }
1481
1482         if(issuer)
1483                 {
1484                 /* Skip most tests for deltas because they have already
1485                  * been done
1486                  */
1487                 if (!crl->base_crl_number)
1488                         {
1489                         /* Check for cRLSign bit if keyUsage present */
1490                         if ((issuer->ex_flags & EXFLAG_KUSAGE) &&
1491                                 !(issuer->ex_kusage & KU_CRL_SIGN))
1492                                 {
1493                                 ctx->error = X509_V_ERR_KEYUSAGE_NO_CRL_SIGN;
1494                                 ok = ctx->verify_cb(0, ctx);
1495                                 if(!ok) goto err;
1496                                 }
1497
1498                         if (!(ctx->current_crl_score & CRL_SCORE_SCOPE))
1499                                 {
1500                                 ctx->error = X509_V_ERR_DIFFERENT_CRL_SCOPE;
1501                                 ok = ctx->verify_cb(0, ctx);
1502                                 if(!ok) goto err;
1503                                 }
1504
1505                         if (!(ctx->current_crl_score & CRL_SCORE_SAME_PATH))
1506                                 {
1507                                 if (check_crl_path(ctx, ctx->current_issuer) <= 0)
1508                                         {
1509                                         ctx->error = X509_V_ERR_CRL_PATH_VALIDATION_ERROR;
1510                                         ok = ctx->verify_cb(0, ctx);
1511                                         if(!ok) goto err;
1512                                         }
1513                                 }
1514
1515                         if (crl->idp_flags & IDP_INVALID)
1516                                 {
1517                                 ctx->error = X509_V_ERR_INVALID_EXTENSION;
1518                                 ok = ctx->verify_cb(0, ctx);
1519                                 if(!ok) goto err;
1520                                 }
1521
1522
1523                         }
1524
1525                 if (!(ctx->current_crl_score & CRL_SCORE_TIME))
1526                         {
1527                         ok = check_crl_time(ctx, crl, 1);
1528                         if (!ok)
1529                                 goto err;
1530                         }
1531
1532                 /* Attempt to get issuer certificate public key */
1533                 ikey = X509_get_pubkey(issuer);
1534
1535                 if(!ikey)
1536                         {
1537                         ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1538                         ok = ctx->verify_cb(0, ctx);
1539                         if (!ok) goto err;
1540                         }
1541                 else
1542                         {
1543                         int rv;
1544                         rv = X509_CRL_check_suiteb(crl, ikey, ctx->param->flags);
1545                         if (rv != X509_V_OK)
1546                                 {
1547                                 ctx->error=rv;
1548                                 ok = ctx->verify_cb(0, ctx);
1549                                 if (!ok)
1550                                         goto err;
1551                                 }
1552                         /* Verify CRL signature */
1553                         if(X509_CRL_verify(crl, ikey) <= 0)
1554                                 {
1555                                 ctx->error=X509_V_ERR_CRL_SIGNATURE_FAILURE;
1556                                 ok = ctx->verify_cb(0, ctx);
1557                                 if (!ok) goto err;
1558                                 }
1559                         }
1560                 }
1561
1562         ok = 1;
1563
1564         err:
1565         EVP_PKEY_free(ikey);
1566         return ok;
1567         }
1568
1569 /* Check certificate against CRL */
1570 static int cert_crl(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x)
1571         {
1572         int ok;
1573         X509_REVOKED *rev;
1574         /* The rules changed for this... previously if a CRL contained
1575          * unhandled critical extensions it could still be used to indicate
1576          * a certificate was revoked. This has since been changed since
1577          * critical extension can change the meaning of CRL entries.
1578          */
1579         if (crl->flags & EXFLAG_CRITICAL)
1580                 {
1581                 if (ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
1582                         return 1;
1583                 ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION;
1584                 ok = ctx->verify_cb(0, ctx);
1585                 if(!ok)
1586                         return 0;
1587                 }
1588         /* Look for serial number of certificate in CRL
1589          * If found make sure reason is not removeFromCRL.
1590          */
1591         if (X509_CRL_get0_by_cert(crl, &rev, x))
1592                 {
1593                 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
1594                         return 2;
1595                 ctx->error = X509_V_ERR_CERT_REVOKED;
1596                 ok = ctx->verify_cb(0, ctx);
1597                 if (!ok)
1598                         return 0;
1599                 }
1600
1601         return 1;
1602         }
1603
1604 static int check_policy(X509_STORE_CTX *ctx)
1605         {
1606         int ret;
1607         if (ctx->parent)
1608                 return 1;
1609         ret = X509_policy_check(&ctx->tree, &ctx->explicit_policy, ctx->chain,
1610                                 ctx->param->policies, ctx->param->flags);
1611         if (ret == 0)
1612                 {
1613                 X509err(X509_F_CHECK_POLICY,ERR_R_MALLOC_FAILURE);
1614                 return 0;
1615                 }
1616         /* Invalid or inconsistent extensions */
1617         if (ret == -1)
1618                 {
1619                 /* Locate certificates with bad extensions and notify
1620                  * callback.
1621                  */
1622                 X509 *x;
1623                 int i;
1624                 for (i = 1; i < sk_X509_num(ctx->chain); i++)
1625                         {
1626                         x = sk_X509_value(ctx->chain, i);
1627                         if (!(x->ex_flags & EXFLAG_INVALID_POLICY))
1628                                 continue;
1629                         ctx->current_cert = x;
1630                         ctx->error = X509_V_ERR_INVALID_POLICY_EXTENSION;
1631                         if(!ctx->verify_cb(0, ctx))
1632                                 return 0;
1633                         }
1634                 return 1;
1635                 }
1636         if (ret == -2)
1637                 {
1638                 ctx->current_cert = NULL;
1639                 ctx->error = X509_V_ERR_NO_EXPLICIT_POLICY;
1640                 return ctx->verify_cb(0, ctx);
1641                 }
1642
1643         if (ctx->param->flags & X509_V_FLAG_NOTIFY_POLICY)
1644                 {
1645                 ctx->current_cert = NULL;
1646                 ctx->error = X509_V_OK;
1647                 if (!ctx->verify_cb(2, ctx))
1648                         return 0;
1649                 }
1650
1651         return 1;
1652         }
1653
1654 static int check_cert_time(X509_STORE_CTX *ctx, X509 *x)
1655         {
1656         time_t *ptime;
1657         int i;
1658
1659         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
1660                 ptime = &ctx->param->check_time;
1661         else
1662                 ptime = NULL;
1663
1664         i=X509_cmp_time(X509_get_notBefore(x), ptime);
1665         if (i == 0)
1666                 {
1667                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
1668                 ctx->current_cert=x;
1669                 if (!ctx->verify_cb(0, ctx))
1670                         return 0;
1671                 }
1672
1673         if (i > 0)
1674                 {
1675                 ctx->error=X509_V_ERR_CERT_NOT_YET_VALID;
1676                 ctx->current_cert=x;
1677                 if (!ctx->verify_cb(0, ctx))
1678                         return 0;
1679                 }
1680
1681         i=X509_cmp_time(X509_get_notAfter(x), ptime);
1682         if (i == 0)
1683                 {
1684                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
1685                 ctx->current_cert=x;
1686                 if (!ctx->verify_cb(0, ctx))
1687                         return 0;
1688                 }
1689
1690         if (i < 0)
1691                 {
1692                 ctx->error=X509_V_ERR_CERT_HAS_EXPIRED;
1693                 ctx->current_cert=x;
1694                 if (!ctx->verify_cb(0, ctx))
1695                         return 0;
1696                 }
1697
1698         return 1;
1699         }
1700
1701 static int internal_verify(X509_STORE_CTX *ctx)
1702         {
1703         int ok=0,n;
1704         X509 *xs,*xi;
1705         EVP_PKEY *pkey=NULL;
1706         int (*cb)(int xok,X509_STORE_CTX *xctx);
1707
1708         cb=ctx->verify_cb;
1709
1710         n=sk_X509_num(ctx->chain);
1711         ctx->error_depth=n-1;
1712         n--;
1713         xi=sk_X509_value(ctx->chain,n);
1714
1715         if (ctx->check_issued(ctx, xi, xi))
1716                 xs=xi;
1717         else
1718                 {
1719                 if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN && n == 0)
1720                         return check_cert_time(ctx, xi);
1721                 if (n <= 0)
1722                         {
1723                         ctx->error=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
1724                         ctx->current_cert=xi;
1725                         ok=cb(0,ctx);
1726                         goto end;
1727                         }
1728                 else
1729                         {
1730                         n--;
1731                         ctx->error_depth=n;
1732                         xs=sk_X509_value(ctx->chain,n);
1733                         }
1734                 }
1735
1736 /*      ctx->error=0;  not needed */
1737         while (n >= 0)
1738                 {
1739                 ctx->error_depth=n;
1740
1741                 /* Skip signature check for self signed certificates unless
1742                  * explicitly asked for. It doesn't add any security and
1743                  * just wastes time.
1744                  */
1745                 if (!xs->valid && (xs != xi || (ctx->param->flags & X509_V_FLAG_CHECK_SS_SIGNATURE)))
1746                         {
1747                         if ((pkey=X509_get_pubkey(xi)) == NULL)
1748                                 {
1749                                 ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1750                                 ctx->current_cert=xi;
1751                                 ok=(*cb)(0,ctx);
1752                                 if (!ok) goto end;
1753                                 }
1754                         else if (X509_verify(xs,pkey) <= 0)
1755                                 {
1756                                 ctx->error=X509_V_ERR_CERT_SIGNATURE_FAILURE;
1757                                 ctx->current_cert=xs;
1758                                 ok=(*cb)(0,ctx);
1759                                 if (!ok)
1760                                         {
1761                                         EVP_PKEY_free(pkey);
1762                                         goto end;
1763                                         }
1764                                 }
1765                         EVP_PKEY_free(pkey);
1766                         pkey=NULL;
1767                         }
1768
1769                 xs->valid = 1;
1770
1771                 ok = check_cert_time(ctx, xs);
1772                 if (!ok)
1773                         goto end;
1774
1775                 /* The last error (if any) is still in the error value */
1776                 ctx->current_issuer=xi;
1777                 ctx->current_cert=xs;
1778                 ok=(*cb)(1,ctx);
1779                 if (!ok) goto end;
1780
1781                 n--;
1782                 if (n >= 0)
1783                         {
1784                         xi=xs;
1785                         xs=sk_X509_value(ctx->chain,n);
1786                         }
1787                 }
1788         ok=1;
1789 end:
1790         return ok;
1791         }
1792
1793 int X509_cmp_current_time(const ASN1_TIME *ctm)
1794 {
1795         return X509_cmp_time(ctm, NULL);
1796 }
1797
1798 int X509_cmp_time(const ASN1_TIME *ctm, time_t *cmp_time)
1799         {
1800         char *str;
1801         ASN1_TIME atm;
1802         long offset;
1803         char buff1[24],buff2[24],*p;
1804         int i,j;
1805
1806         p=buff1;
1807         i=ctm->length;
1808         str=(char *)ctm->data;
1809         if (ctm->type == V_ASN1_UTCTIME)
1810                 {
1811                 if ((i < 11) || (i > 17)) return 0;
1812                 memcpy(p,str,10);
1813                 p+=10;
1814                 str+=10;
1815                 }
1816         else
1817                 {
1818                 if (i < 13) return 0;
1819                 memcpy(p,str,12);
1820                 p+=12;
1821                 str+=12;
1822                 }
1823
1824         if ((*str == 'Z') || (*str == '-') || (*str == '+'))
1825                 { *(p++)='0'; *(p++)='0'; }
1826         else
1827                 {
1828                 *(p++)= *(str++);
1829                 *(p++)= *(str++);
1830                 /* Skip any fractional seconds... */
1831                 if (*str == '.')
1832                         {
1833                         str++;
1834                         while ((*str >= '0') && (*str <= '9')) str++;
1835                         }
1836
1837                 }
1838         *(p++)='Z';
1839         *(p++)='\0';
1840
1841         if (*str == 'Z')
1842                 offset=0;
1843         else
1844                 {
1845                 if ((*str != '+') && (*str != '-'))
1846                         return 0;
1847                 offset=((str[1]-'0')*10+(str[2]-'0'))*60;
1848                 offset+=(str[3]-'0')*10+(str[4]-'0');
1849                 if (*str == '-')
1850                         offset= -offset;
1851                 }
1852         atm.type=ctm->type;
1853         atm.flags = 0;
1854         atm.length=sizeof(buff2);
1855         atm.data=(unsigned char *)buff2;
1856
1857         if (X509_time_adj(&atm, offset*60, cmp_time) == NULL)
1858                 return 0;
1859
1860         if (ctm->type == V_ASN1_UTCTIME)
1861                 {
1862                 i=(buff1[0]-'0')*10+(buff1[1]-'0');
1863                 if (i < 50) i+=100; /* cf. RFC 2459 */
1864                 j=(buff2[0]-'0')*10+(buff2[1]-'0');
1865                 if (j < 50) j+=100;
1866
1867                 if (i < j) return -1;
1868                 if (i > j) return 1;
1869                 }
1870         i=strcmp(buff1,buff2);
1871         if (i == 0) /* wait a second then return younger :-) */
1872                 return -1;
1873         else
1874                 return i;
1875         }
1876
1877 ASN1_TIME *X509_gmtime_adj(ASN1_TIME *s, long adj)
1878 {
1879         return X509_time_adj(s, adj, NULL);
1880 }
1881
1882 ASN1_TIME *X509_time_adj(ASN1_TIME *s, long offset_sec, time_t *in_tm)
1883         {
1884         return X509_time_adj_ex(s, 0, offset_sec, in_tm);
1885         }
1886
1887 ASN1_TIME *X509_time_adj_ex(ASN1_TIME *s,
1888                                 int offset_day, long offset_sec, time_t *in_tm)
1889         {
1890         time_t t;
1891
1892         if (in_tm) t = *in_tm;
1893         else time(&t);
1894
1895         if (s && !(s->flags & ASN1_STRING_FLAG_MSTRING))
1896                 {
1897                 if (s->type == V_ASN1_UTCTIME)
1898                         return ASN1_UTCTIME_adj(s,t, offset_day, offset_sec);
1899                 if (s->type == V_ASN1_GENERALIZEDTIME)
1900                         return ASN1_GENERALIZEDTIME_adj(s, t, offset_day,
1901                                                                 offset_sec);
1902                 }
1903         return ASN1_TIME_adj(s, t, offset_day, offset_sec);
1904         }
1905
1906 int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain)
1907         {
1908         EVP_PKEY *ktmp=NULL,*ktmp2;
1909         int i,j;
1910
1911         if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) return 1;
1912
1913         for (i=0; i<sk_X509_num(chain); i++)
1914                 {
1915                 ktmp=X509_get_pubkey(sk_X509_value(chain,i));
1916                 if (ktmp == NULL)
1917                         {
1918                         X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
1919                         return 0;
1920                         }
1921                 if (!EVP_PKEY_missing_parameters(ktmp))
1922                         break;
1923                 else
1924                         {
1925                         EVP_PKEY_free(ktmp);
1926                         ktmp=NULL;
1927                         }
1928                 }
1929         if (ktmp == NULL)
1930                 {
1931                 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
1932                 return 0;
1933                 }
1934
1935         /* first, populate the other certs */
1936         for (j=i-1; j >= 0; j--)
1937                 {
1938                 ktmp2=X509_get_pubkey(sk_X509_value(chain,j));
1939                 EVP_PKEY_copy_parameters(ktmp2,ktmp);
1940                 EVP_PKEY_free(ktmp2);
1941                 }
1942
1943         if (pkey != NULL) EVP_PKEY_copy_parameters(pkey,ktmp);
1944         EVP_PKEY_free(ktmp);
1945         return 1;
1946         }
1947
1948 int X509_STORE_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
1949              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
1950         {
1951         /* This function is (usually) called only once, by
1952          * SSL_get_ex_data_X509_STORE_CTX_idx (ssl/ssl_cert.c). */
1953         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_X509_STORE_CTX, argl, argp,
1954                         new_func, dup_func, free_func);
1955         }
1956
1957 int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data)
1958         {
1959         return CRYPTO_set_ex_data(&ctx->ex_data,idx,data);
1960         }
1961
1962 void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx)
1963         {
1964         return CRYPTO_get_ex_data(&ctx->ex_data,idx);
1965         }
1966
1967 int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx)
1968         {
1969         return ctx->error;
1970         }
1971
1972 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err)
1973         {
1974         ctx->error=err;
1975         }
1976
1977 int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx)
1978         {
1979         return ctx->error_depth;
1980         }
1981
1982 X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx)
1983         {
1984         return ctx->current_cert;
1985         }
1986
1987 STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx)
1988         {
1989         return ctx->chain;
1990         }
1991
1992 STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx)
1993         {
1994         int i;
1995         X509 *x;
1996         STACK_OF(X509) *chain;
1997         if (!ctx->chain || !(chain = sk_X509_dup(ctx->chain))) return NULL;
1998         for (i = 0; i < sk_X509_num(chain); i++)
1999                 {
2000                 x = sk_X509_value(chain, i);
2001                 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
2002                 }
2003         return chain;
2004         }
2005
2006 X509 *X509_STORE_CTX_get0_current_issuer(X509_STORE_CTX *ctx)
2007         {
2008         return ctx->current_issuer;
2009         }
2010
2011 X509_CRL *X509_STORE_CTX_get0_current_crl(X509_STORE_CTX *ctx)
2012         {
2013         return ctx->current_crl;
2014         }
2015
2016 X509_STORE_CTX *X509_STORE_CTX_get0_parent_ctx(X509_STORE_CTX *ctx)
2017         {
2018         return ctx->parent;
2019         }
2020
2021 void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x)
2022         {
2023         ctx->cert=x;
2024         }
2025
2026 void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2027         {
2028         ctx->untrusted=sk;
2029         }
2030
2031 void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk)
2032         {
2033         ctx->crls=sk;
2034         }
2035
2036 int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose)
2037         {
2038         return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0);
2039         }
2040
2041 int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust)
2042         {
2043         return X509_STORE_CTX_purpose_inherit(ctx, 0, 0, trust);
2044         }
2045
2046 /* This function is used to set the X509_STORE_CTX purpose and trust
2047  * values. This is intended to be used when another structure has its
2048  * own trust and purpose values which (if set) will be inherited by
2049  * the ctx. If they aren't set then we will usually have a default
2050  * purpose in mind which should then be used to set the trust value.
2051  * An example of this is SSL use: an SSL structure will have its own
2052  * purpose and trust settings which the application can set: if they
2053  * aren't set then we use the default of SSL client/server.
2054  */
2055
2056 int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
2057                                 int purpose, int trust)
2058 {
2059         int idx;
2060         /* If purpose not set use default */
2061         if (!purpose) purpose = def_purpose;
2062         /* If we have a purpose then check it is valid */
2063         if (purpose)
2064                 {
2065                 X509_PURPOSE *ptmp;
2066                 idx = X509_PURPOSE_get_by_id(purpose);
2067                 if (idx == -1)
2068                         {
2069                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2070                                                 X509_R_UNKNOWN_PURPOSE_ID);
2071                         return 0;
2072                         }
2073                 ptmp = X509_PURPOSE_get0(idx);
2074                 if (ptmp->trust == X509_TRUST_DEFAULT)
2075                         {
2076                         idx = X509_PURPOSE_get_by_id(def_purpose);
2077                         if (idx == -1)
2078                                 {
2079                                 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2080                                                 X509_R_UNKNOWN_PURPOSE_ID);
2081                                 return 0;
2082                                 }
2083                         ptmp = X509_PURPOSE_get0(idx);
2084                         }
2085                 /* If trust not set then get from purpose default */
2086                 if (!trust) trust = ptmp->trust;
2087                 }
2088         if (trust)
2089                 {
2090                 idx = X509_TRUST_get_by_id(trust);
2091                 if (idx == -1)
2092                         {
2093                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2094                                                 X509_R_UNKNOWN_TRUST_ID);
2095                         return 0;
2096                         }
2097                 }
2098
2099         if (purpose && !ctx->param->purpose) ctx->param->purpose = purpose;
2100         if (trust && !ctx->param->trust) ctx->param->trust = trust;
2101         return 1;
2102 }
2103
2104 X509_STORE_CTX *X509_STORE_CTX_new(void)
2105 {
2106         X509_STORE_CTX *ctx;
2107         ctx = (X509_STORE_CTX *)OPENSSL_malloc(sizeof(X509_STORE_CTX));
2108         if (!ctx)
2109                 {
2110                 X509err(X509_F_X509_STORE_CTX_NEW,ERR_R_MALLOC_FAILURE);
2111                 return NULL;
2112                 }
2113         memset(ctx, 0, sizeof(X509_STORE_CTX));
2114         return ctx;
2115 }
2116
2117 void X509_STORE_CTX_free(X509_STORE_CTX *ctx)
2118 {
2119         X509_STORE_CTX_cleanup(ctx);
2120         OPENSSL_free(ctx);
2121 }
2122
2123 int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store, X509 *x509,
2124              STACK_OF(X509) *chain)
2125         {
2126         int ret = 1;
2127         ctx->ctx=store;
2128         ctx->current_method=0;
2129         ctx->cert=x509;
2130         ctx->untrusted=chain;
2131         ctx->crls = NULL;
2132         ctx->last_untrusted=0;
2133         ctx->other_ctx=NULL;
2134         ctx->valid=0;
2135         ctx->chain=NULL;
2136         ctx->error=0;
2137         ctx->explicit_policy=0;
2138         ctx->error_depth=0;
2139         ctx->current_cert=NULL;
2140         ctx->current_issuer=NULL;
2141         ctx->current_crl=NULL;
2142         ctx->current_crl_score=0;
2143         ctx->current_reasons=0;
2144         ctx->tree = NULL;
2145         ctx->parent = NULL;
2146
2147         ctx->param = X509_VERIFY_PARAM_new();
2148
2149         if (!ctx->param)
2150                 {
2151                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2152                 return 0;
2153                 }
2154
2155         /* Inherit callbacks and flags from X509_STORE if not set
2156          * use defaults.
2157          */
2158
2159
2160         if (store)
2161                 ret = X509_VERIFY_PARAM_inherit(ctx->param, store->param);
2162         else
2163                 ctx->param->inh_flags |= X509_VP_FLAG_DEFAULT|X509_VP_FLAG_ONCE;
2164
2165         if (store)
2166                 {
2167                 ctx->verify_cb = store->verify_cb;
2168                 ctx->cleanup = store->cleanup;
2169                 }
2170         else
2171                 ctx->cleanup = 0;
2172
2173         if (ret)
2174                 ret = X509_VERIFY_PARAM_inherit(ctx->param,
2175                                         X509_VERIFY_PARAM_lookup("default"));
2176
2177         if (ret == 0)
2178                 {
2179                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2180                 return 0;
2181                 }
2182
2183         if (store && store->check_issued)
2184                 ctx->check_issued = store->check_issued;
2185         else
2186                 ctx->check_issued = check_issued;
2187
2188         if (store && store->get_issuer)
2189                 ctx->get_issuer = store->get_issuer;
2190         else
2191                 ctx->get_issuer = X509_STORE_CTX_get1_issuer;
2192
2193         if (store && store->verify_cb)
2194                 ctx->verify_cb = store->verify_cb;
2195         else
2196                 ctx->verify_cb = null_callback;
2197
2198         if (store && store->verify)
2199                 ctx->verify = store->verify;
2200         else
2201                 ctx->verify = internal_verify;
2202
2203         if (store && store->check_revocation)
2204                 ctx->check_revocation = store->check_revocation;
2205         else
2206                 ctx->check_revocation = check_revocation;
2207
2208         if (store && store->get_crl)
2209                 ctx->get_crl = store->get_crl;
2210         else
2211                 ctx->get_crl = NULL;
2212
2213         if (store && store->check_crl)
2214                 ctx->check_crl = store->check_crl;
2215         else
2216                 ctx->check_crl = check_crl;
2217
2218         if (store && store->cert_crl)
2219                 ctx->cert_crl = store->cert_crl;
2220         else
2221                 ctx->cert_crl = cert_crl;
2222
2223         if (store && store->lookup_certs)
2224                 ctx->lookup_certs = store->lookup_certs;
2225         else
2226                 ctx->lookup_certs = X509_STORE_get1_certs;
2227
2228         if (store && store->lookup_crls)
2229                 ctx->lookup_crls = store->lookup_crls;
2230         else
2231                 ctx->lookup_crls = X509_STORE_get1_crls;
2232
2233         ctx->check_policy = check_policy;
2234
2235
2236         /* This memset() can't make any sense anyway, so it's removed. As
2237          * X509_STORE_CTX_cleanup does a proper "free" on the ex_data, we put a
2238          * corresponding "new" here and remove this bogus initialisation. */
2239         /* memset(&(ctx->ex_data),0,sizeof(CRYPTO_EX_DATA)); */
2240         if(!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx,
2241                                 &(ctx->ex_data)))
2242                 {
2243                 OPENSSL_free(ctx);
2244                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2245                 return 0;
2246                 }
2247         return 1;
2248         }
2249
2250 /* Set alternative lookup method: just a STACK of trusted certificates.
2251  * This avoids X509_STORE nastiness where it isn't needed.
2252  */
2253
2254 void X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2255 {
2256         ctx->other_ctx = sk;
2257         ctx->get_issuer = get_issuer_sk;
2258 }
2259
2260 void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx)
2261         {
2262         if (ctx->cleanup) ctx->cleanup(ctx);
2263         if (ctx->param != NULL)
2264                 {
2265                 if (ctx->parent == NULL)
2266                         X509_VERIFY_PARAM_free(ctx->param);
2267                 ctx->param=NULL;
2268                 }
2269         if (ctx->tree != NULL)
2270                 {
2271                 X509_policy_tree_free(ctx->tree);
2272                 ctx->tree=NULL;
2273                 }
2274         if (ctx->chain != NULL)
2275                 {
2276                 sk_X509_pop_free(ctx->chain,X509_free);
2277                 ctx->chain=NULL;
2278                 }
2279         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, &(ctx->ex_data));
2280         memset(&ctx->ex_data,0,sizeof(CRYPTO_EX_DATA));
2281         }
2282
2283 void X509_STORE_CTX_set_depth(X509_STORE_CTX *ctx, int depth)
2284         {
2285         X509_VERIFY_PARAM_set_depth(ctx->param, depth);
2286         }
2287
2288 void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, unsigned long flags)
2289         {
2290         X509_VERIFY_PARAM_set_flags(ctx->param, flags);
2291         }
2292
2293 void X509_STORE_CTX_set_time(X509_STORE_CTX *ctx, unsigned long flags, time_t t)
2294         {
2295         X509_VERIFY_PARAM_set_time(ctx->param, t);
2296         }
2297
2298 void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx,
2299                                   int (*verify_cb)(int, X509_STORE_CTX *))
2300         {
2301         ctx->verify_cb=verify_cb;
2302         }
2303
2304 X509_POLICY_TREE *X509_STORE_CTX_get0_policy_tree(X509_STORE_CTX *ctx)
2305         {
2306         return ctx->tree;
2307         }
2308
2309 int X509_STORE_CTX_get_explicit_policy(X509_STORE_CTX *ctx)
2310         {
2311         return ctx->explicit_policy;
2312         }
2313
2314 int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name)
2315         {
2316         const X509_VERIFY_PARAM *param;
2317         param = X509_VERIFY_PARAM_lookup(name);
2318         if (!param)
2319                 return 0;
2320         return X509_VERIFY_PARAM_inherit(ctx->param, param);
2321         }
2322
2323 X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx)
2324         {
2325         return ctx->param;
2326         }
2327
2328 void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param)
2329         {
2330         if (ctx->param)
2331                 X509_VERIFY_PARAM_free(ctx->param);
2332         ctx->param = param;
2333         }
2334
2335 IMPLEMENT_STACK_OF(X509)
2336 IMPLEMENT_ASN1_SET_OF(X509)
2337
2338 IMPLEMENT_STACK_OF(X509_NAME)
2339
2340 IMPLEMENT_STACK_OF(X509_ATTRIBUTE)
2341 IMPLEMENT_ASN1_SET_OF(X509_ATTRIBUTE)