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_trust(X509_STORE_CTX *ctx);
 117 static int check_revocation(X509_STORE_CTX *ctx);
 118 static int check_cert(X509_STORE_CTX *ctx);
 119 static int check_policy(X509_STORE_CTX *ctx);
 120
 121 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
 122                         unsigned int *preasons,
 123                         X509_CRL *crl, X509 *x);
 124 static int get_crl_delta(X509_STORE_CTX *ctx,
 125                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x);
 126 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pcrl_score,
 127                         X509_CRL *base, STACK_OF(X509_CRL) *crls);
 128 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
 129                                 X509 **pissuer, int *pcrl_score);
 130 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
 131                                 unsigned int *preasons);
 132 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x);
 133 static int check_crl_chain(X509_STORE_CTX *ctx,
 134                         STACK_OF(X509) *cert_path,
 135                         STACK_OF(X509) *crl_path);
 136
 137 static int internal_verify(X509_STORE_CTX *ctx);
 138 const char X509_version[]="X.509" OPENSSL_VERSION_PTEXT;
 139
 140
 141 static int null_callback(int ok, X509_STORE_CTX *e)
 142         {
 143         return ok;
 144         }
 145
 146 #if 0
 147 static int x509_subject_cmp(X509 **a, X509 **b)
 148         {
 149         return X509_subject_name_cmp(*a,*b);
 150         }
 151 #endif
 152 /* Return 1 is a certificate is self signed */
 153 static int cert_self_signed(X509 *x)
 154         {
 155         X509_check_purpose(x, -1, 0);
 156         if (x->ex_flags & EXFLAG_SS)
 157                 return 1;
 158         else
 159                 return 0;
 160         }
 161
 162 int X509_verify_cert(X509_STORE_CTX *ctx)
 163         {
 164         X509 *x,*xtmp,*chain_ss=NULL;
 165         int bad_chain = 0;
 166         X509_VERIFY_PARAM *param = ctx->param;
 167         int depth,i,ok=0;
 168         int num;
 169         int (*cb)(int xok,X509_STORE_CTX *xctx);
 170         STACK_OF(X509) *sktmp=NULL;
 171         if (ctx->cert == NULL)
 172                 {
 173                 X509err(X509_F_X509_VERIFY_CERT,X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
 174                 return -1;
 175                 }
 176
 177         cb=ctx->verify_cb;
 178
 179         /* first we make sure the chain we are going to build is
 180          * present and that the first entry is in place */
 181         if (ctx->chain == NULL)
 182                 {
 183                 if (    ((ctx->chain=sk_X509_new_null()) == NULL) ||
 184                         (!sk_X509_push(ctx->chain,ctx->cert)))
 185                         {
 186                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 187                         goto end;
 188                         }
 189                 CRYPTO_add(&ctx->cert->references,1,CRYPTO_LOCK_X509);
 190                 ctx->last_untrusted=1;
 191                 }
 192
 193         /* We use a temporary STACK so we can chop and hack at it */
 194         if (ctx->untrusted != NULL
 195             && (sktmp=sk_X509_dup(ctx->untrusted)) == NULL)
 196                 {
 197                 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 198                 goto end;
 199                 }
 200
 201         num=sk_X509_num(ctx->chain);
 202         x=sk_X509_value(ctx->chain,num-1);
 203         depth=param->depth;
 204
 205
 206         for (;;)
 207                 {
 208                 /* If we have enough, we break */
 209                 if (depth < num) break; /* FIXME: If this happens, we should take
 210                                          * note of it and, if appropriate, use the
 211                                          * X509_V_ERR_CERT_CHAIN_TOO_LONG error
 212                                          * code later.
 213                                          */
 214
 215                 /* If we are self signed, we break */
 216                 if (cert_self_signed(x))
 217                         break;
 218                 /* If asked see if we can find issuer in trusted store first */
 219                 if (ctx->param->flags & X509_V_FLAG_TRUSTED_FIRST)
 220                         {
 221                         ok = ctx->get_issuer(&xtmp, ctx, x);
 222                         if (ok < 0)
 223                                 return ok;
 224                         /* If successful for now free up cert so it
 225                          * will be picked up again later.
 226                          */
 227                         if (ok > 0)
 228                                 {
 229                                 X509_free(xtmp);
 230                                 break;
 231                                 }
 232                         }
 233
 234                 /* If we were passed a cert chain, use it first */
 235                 if (ctx->untrusted != NULL)
 236                         {
 237                         xtmp=find_issuer(ctx, sktmp,x);
 238                         if (xtmp != NULL)
 239                                 {
 240                                 if (!sk_X509_push(ctx->chain,xtmp))
 241                                         {
 242                                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 243                                         goto end;
 244                                         }
 245                                 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
 246                                 (void)sk_X509_delete_ptr(sktmp,xtmp);
 247                                 ctx->last_untrusted++;
 248                                 x=xtmp;
 249                                 num++;
 250                                 /* reparse the full chain for
 251                                  * the next one */
 252                                 continue;
 253                                 }
 254                         }
 255                 break;
 256                 }
 257
 258         /* at this point, chain should contain a list of untrusted
 259          * certificates.  We now need to add at least one trusted one,
 260          * if possible, otherwise we complain. */
 261
 262         /* Examine last certificate in chain and see if it
 263          * is self signed.
 264          */
 265
 266         i=sk_X509_num(ctx->chain);
 267         x=sk_X509_value(ctx->chain,i-1);
 268         if (cert_self_signed(x))
 269                 {
 270                 /* we have a self signed certificate */
 271                 if (sk_X509_num(ctx->chain) == 1)
 272                         {
 273                         /* We have a single self signed certificate: see if
 274                          * we can find it in the store. We must have an exact
 275                          * match to avoid possible impersonation.
 276                          */
 277                         ok = ctx->get_issuer(&xtmp, ctx, x);
 278                         if ((ok <= 0) || X509_cmp(x, xtmp))
 279                                 {
 280                                 ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
 281                                 ctx->current_cert=x;
 282                                 ctx->error_depth=i-1;
 283                                 if (ok == 1) X509_free(xtmp);
 284                                 bad_chain = 1;
 285                                 ok=cb(0,ctx);
 286                                 if (!ok) goto end;
 287                                 }
 288                         else
 289                                 {
 290                                 /* We have a match: replace certificate with store version
 291                                  * so we get any trust settings.
 292                                  */
 293                                 X509_free(x);
 294                                 x = xtmp;
 295                                 (void)sk_X509_set(ctx->chain, i - 1, x);
 296                                 ctx->last_untrusted=0;
 297                                 }
 298                         }
 299                 else
 300                         {
 301                         /* extract and save self signed certificate for later use */
 302                         chain_ss=sk_X509_pop(ctx->chain);
 303                         ctx->last_untrusted--;
 304                         num--;
 305                         x=sk_X509_value(ctx->chain,num-1);
 306                         }
 307                 }
 308
 309         /* We now lookup certs from the certificate store */
 310         for (;;)
 311                 {
 312                 /* If we have enough, we break */
 313                 if (depth < num) break;
 314
 315                 /* If we are self signed, we break */
 316                 if (cert_self_signed(x))
 317                         break;
 318
 319                 ok = ctx->get_issuer(&xtmp, ctx, x);
 320
 321                 if (ok < 0) return ok;
 322                 if (ok == 0) break;
 323
 324                 x = xtmp;
 325                 if (!sk_X509_push(ctx->chain,x))
 326                         {
 327                         X509_free(xtmp);
 328                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 329                         return 0;
 330                         }
 331                 num++;
 332                 }
 333
 334         /* we now have our chain, lets check it... */
 335
 336         i = check_trust(ctx);
 337
 338         /* If explicitly rejected error */
 339         if (i == X509_TRUST_REJECTED)
 340                 goto end;
 341         /* If not explicitly trusted then indicate error */
 342         if (i != X509_TRUST_TRUSTED)
 343                 {
 344                 if ((chain_ss == NULL) || !ctx->check_issued(ctx, x, chain_ss))
 345                         {
 346                         if (ctx->last_untrusted >= num)
 347                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
 348                         else
 349                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
 350                         ctx->current_cert=x;
 351                         }
 352                 else
 353                         {
 354
 355                         sk_X509_push(ctx->chain,chain_ss);
 356                         num++;
 357                         ctx->last_untrusted=num;
 358                         ctx->current_cert=chain_ss;
 359                         ctx->error=X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
 360                         chain_ss=NULL;
 361                         }
 362
 363                 ctx->error_depth=num-1;
 364                 bad_chain = 1;
 365                 ok=cb(0,ctx);
 366                 if (!ok) goto end;
 367                 }
 368
 369         /* We have the chain complete: now we need to check its purpose */
 370         ok = check_chain_extensions(ctx);
 371
 372         if (!ok) goto end;
 373
 374         /* Check name constraints */
 375
 376         ok = check_name_constraints(ctx);
 377
 378         if (!ok) goto end;
 379
 380         /* We may as well copy down any DSA parameters that are required */
 381         X509_get_pubkey_parameters(NULL,ctx->chain);
 382
 383         /* Check revocation status: we do this after copying parameters
 384          * because they may be needed for CRL signature verification.
 385          */
 386
 387         ok = ctx->check_revocation(ctx);
 388         if(!ok) goto end;
 389
 390         /* At this point, we have a chain and need to verify it */
 391         if (ctx->verify != NULL)
 392                 ok=ctx->verify(ctx);
 393         else
 394                 ok=internal_verify(ctx);
 395         if(!ok) goto end;
 396
 397 #ifndef OPENSSL_NO_RFC3779
 398         /* RFC 3779 path validation, now that CRL check has been done */
 399         ok = v3_asid_validate_path(ctx);
 400         if (!ok) goto end;
 401         ok = v3_addr_validate_path(ctx);
 402         if (!ok) goto end;
 403 #endif
 404
 405         /* If we get this far evaluate policies */
 406         if (!bad_chain && (ctx->param->flags & X509_V_FLAG_POLICY_CHECK))
 407                 ok = ctx->check_policy(ctx);
 408         if(!ok) goto end;
 409         if (0)
 410                 {
 411 end:
 412                 X509_get_pubkey_parameters(NULL,ctx->chain);
 413                 }
 414         if (sktmp != NULL) sk_X509_free(sktmp);
 415         if (chain_ss != NULL) X509_free(chain_ss);
 416         return ok;
 417         }
 418
 419
 420 /* Given a STACK_OF(X509) find the issuer of cert (if any)
 421  */
 422
 423 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x)
 424 {
 425         int i;
 426         X509 *issuer;
 427         for (i = 0; i < sk_X509_num(sk); i++)
 428                 {
 429                 issuer = sk_X509_value(sk, i);
 430                 if (ctx->check_issued(ctx, x, issuer))
 431                         return issuer;
 432                 }
 433         return NULL;
 434 }
 435
 436 /* Given a possible certificate and issuer check them */
 437
 438 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer)
 439 {
 440         int ret;
 441         ret = X509_check_issued(issuer, x);
 442         if (ret == X509_V_OK)
 443                 {
 444                 int i;
 445                 X509 *ch;
 446                 for (i = 0; i < sk_X509_num(ctx->chain); i++)
 447                         {
 448                         ch = sk_X509_value(ctx->chain, i);
 449                         if (ch == issuer || !X509_cmp(ch, issuer))
 450                                 {
 451                                 ret = X509_V_ERR_PATH_LOOP;
 452                                 break;
 453                                 }
 454                         }
 455                 }
 456
 457         if (ret == X509_V_OK)
 458                 return 1;
 459         /* If we haven't asked for issuer errors don't set ctx */
 460         if (!(ctx->param->flags & X509_V_FLAG_CB_ISSUER_CHECK))
 461                 return 0;
 462
 463         ctx->error = ret;
 464         ctx->current_cert = x;
 465         ctx->current_issuer = issuer;
 466         return ctx->verify_cb(0, ctx);
 467         return 0;
 468 }
 469
 470 /* Alternative lookup method: look from a STACK stored in other_ctx */
 471
 472 static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
 473 {
 474         *issuer = find_issuer(ctx, ctx->other_ctx, x);
 475         if (*issuer)
 476                 {
 477                 CRYPTO_add(&(*issuer)->references,1,CRYPTO_LOCK_X509);
 478                 return 1;
 479                 }
 480         else
 481                 return 0;
 482 }
 483
 484
 485 /* Check a certificate chains extensions for consistency
 486  * with the supplied purpose
 487  */
 488
 489 static int check_chain_extensions(X509_STORE_CTX *ctx)
 490 {
 491 #ifdef OPENSSL_NO_CHAIN_VERIFY
 492         return 1;
 493 #else
 494         int i, ok=0, must_be_ca, plen = 0;
 495         X509 *x;
 496         int (*cb)(int xok,X509_STORE_CTX *xctx);
 497         int proxy_path_length = 0;
 498         int purpose;
 499         int allow_proxy_certs;
 500         cb=ctx->verify_cb;
 501
 502         /* must_be_ca can have 1 of 3 values:
 503            -1: we accept both CA and non-CA certificates, to allow direct
 504                use of self-signed certificates (which are marked as CA).
 505            0:  we only accept non-CA certificates.  This is currently not
 506                used, but the possibility is present for future extensions.
 507            1:  we only accept CA certificates.  This is currently used for
 508                all certificates in the chain except the leaf certificate.
 509         */
 510         must_be_ca = -1;
 511
 512         /* CRL path validation */
 513         if (ctx->parent)
 514                 {
 515                 allow_proxy_certs = 0;
 516                 purpose = X509_PURPOSE_CRL_SIGN;
 517                 }
 518         else
 519                 {
 520                 allow_proxy_certs =
 521                         !!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
 522                 /* A hack to keep people who don't want to modify their
 523                    software happy */
 524                 if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
 525                         allow_proxy_certs = 1;
 526                 purpose = ctx->param->purpose;
 527                 }
 528
 529         /* Check all untrusted certificates */
 530         for (i = 0; i < ctx->last_untrusted; i++)
 531                 {
 532                 int ret;
 533                 x = sk_X509_value(ctx->chain, i);
 534                 if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
 535                         && (x->ex_flags & EXFLAG_CRITICAL))
 536                         {
 537                         ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;
 538                         ctx->error_depth = i;
 539                         ctx->current_cert = x;
 540                         ok=cb(0,ctx);
 541                         if (!ok) goto end;
 542                         }
 543                 if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY))
 544                         {
 545                         ctx->error = X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED;
 546                         ctx->error_depth = i;
 547                         ctx->current_cert = x;
 548                         ok=cb(0,ctx);
 549                         if (!ok) goto end;
 550                         }
 551                 ret = X509_check_ca(x);
 552                 switch(must_be_ca)
 553                         {
 554                 case -1:
 555                         if ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 556                                 && (ret != 1) && (ret != 0))
 557                                 {
 558                                 ret = 0;
 559                                 ctx->error = X509_V_ERR_INVALID_CA;
 560                                 }
 561                         else
 562                                 ret = 1;
 563                         break;
 564                 case 0:
 565                         if (ret != 0)
 566                                 {
 567                                 ret = 0;
 568                                 ctx->error = X509_V_ERR_INVALID_NON_CA;
 569                                 }
 570                         else
 571                                 ret = 1;
 572                         break;
 573                 default:
 574                         if ((ret == 0)
 575                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 576                                         && (ret != 1)))
 577                                 {
 578                                 ret = 0;
 579                                 ctx->error = X509_V_ERR_INVALID_CA;
 580                                 }
 581                         else
 582                                 ret = 1;
 583                         break;
 584                         }
 585                 if (ret == 0)
 586                         {
 587                         ctx->error_depth = i;
 588                         ctx->current_cert = x;
 589                         ok=cb(0,ctx);
 590                         if (!ok) goto end;
 591                         }
 592                 if (ctx->param->purpose > 0)
 593                         {
 594                         ret = X509_check_purpose(x, purpose, must_be_ca > 0);
 595                         if ((ret == 0)
 596                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 597                                         && (ret != 1)))
 598                                 {
 599                                 ctx->error = X509_V_ERR_INVALID_PURPOSE;
 600                                 ctx->error_depth = i;
 601                                 ctx->current_cert = x;
 602                                 ok=cb(0,ctx);
 603                                 if (!ok) goto end;
 604                                 }
 605                         }
 606                 /* Check pathlen if not self issued */
 607                 if ((i > 1) && !(x->ex_flags & EXFLAG_SI)
 608                            && (x->ex_pathlen != -1)
 609                            && (plen > (x->ex_pathlen + proxy_path_length + 1)))
 610                         {
 611                         ctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;
 612                         ctx->error_depth = i;
 613                         ctx->current_cert = x;
 614                         ok=cb(0,ctx);
 615                         if (!ok) goto end;
 616                         }
 617                 /* Increment path length if not self issued */
 618                 if (!(x->ex_flags & EXFLAG_SI))
 619                         plen++;
 620                 /* If this certificate is a proxy certificate, the next
 621                    certificate must be another proxy certificate or a EE
 622                    certificate.  If not, the next certificate must be a
 623                    CA certificate.  */
 624                 if (x->ex_flags & EXFLAG_PROXY)
 625                         {
 626                         if (x->ex_pcpathlen != -1 && i > x->ex_pcpathlen)
 627                                 {
 628                                 ctx->error =
 629                                         X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED;
 630                                 ctx->error_depth = i;
 631                                 ctx->current_cert = x;
 632                                 ok=cb(0,ctx);
 633                                 if (!ok) goto end;
 634                                 }
 635                         proxy_path_length++;
 636                         must_be_ca = 0;
 637                         }
 638                 else
 639                         must_be_ca = 1;
 640                 }
 641         ok = 1;
 642  end:
 643         return ok;
 644 #endif
 645 }
 646
 647 static int check_name_constraints(X509_STORE_CTX *ctx)
 648         {
 649         X509 *x;
 650         int i, j, rv;
 651         /* Check name constraints for all certificates */
 652         for (i = sk_X509_num(ctx->chain) - 1; i >= 0; i--)
 653                 {
 654                 x = sk_X509_value(ctx->chain, i);
 655                 /* Ignore self issued certs unless last in chain */
 656                 if (i && (x->ex_flags & EXFLAG_SI))
 657                         continue;
 658                 /* Check against constraints for all certificates higher in
 659                  * chain including trust anchor. Trust anchor not strictly
 660                  * speaking needed but if it includes constraints it is to be
 661                  * assumed it expects them to be obeyed.
 662                  */
 663                 for (j = sk_X509_num(ctx->chain) - 1; j > i; j--)
 664                         {
 665                         NAME_CONSTRAINTS *nc = sk_X509_value(ctx->chain, j)->nc;
 666                         if (nc)
 667                                 {
 668                                 rv = NAME_CONSTRAINTS_check(x, nc);
 669                                 if (rv != X509_V_OK)
 670                                         {
 671                                         ctx->error = rv;
 672                                         ctx->error_depth = i;
 673                                         ctx->current_cert = x;
 674                                         if (!ctx->verify_cb(0,ctx))
 675                                                 return 0;
 676                                         }
 677                                 }
 678                         }
 679                 }
 680         return 1;
 681         }
 682
 683 static int check_trust(X509_STORE_CTX *ctx)
 684 {
 685         int i, ok;
 686         X509 *x = NULL;
 687         int (*cb)(int xok,X509_STORE_CTX *xctx);
 688         cb=ctx->verify_cb;
 689         /* Check all trusted certificates in chain */
 690         for (i = ctx->last_untrusted; i < sk_X509_num(ctx->chain); i++)
 691                 {
 692                 x = sk_X509_value(ctx->chain, i);
 693                 ok = X509_check_trust(x, ctx->param->trust, 0);
 694                 /* If explicitly trusted return trusted */
 695                 if (ok == X509_TRUST_TRUSTED)
 696                         return X509_TRUST_TRUSTED;
 697                 /* If explicitly rejected notify callback and reject if
 698                  * not overridden.
 699                  */
 700                 if (ok == X509_TRUST_REJECTED)
 701                         {
 702                         ctx->error_depth = i;
 703                         ctx->current_cert = x;
 704                         ctx->error = X509_V_ERR_CERT_REJECTED;
 705                         ok = cb(0, ctx);
 706                         if (!ok)
 707                                 return X509_TRUST_REJECTED;
 708                         }
 709                 }
 710         /* If no trusted certs in chain at all return untrusted and
 711          * allow standard (no issuer cert) etc errors to be indicated.
 712          */
 713         return X509_TRUST_UNTRUSTED;
 714 }
 715
 716 static int check_revocation(X509_STORE_CTX *ctx)
 717         {
 718         int i, last, ok;
 719         if (!(ctx->param->flags & X509_V_FLAG_CRL_CHECK))
 720                 return 1;
 721         if (ctx->param->flags & X509_V_FLAG_CRL_CHECK_ALL)
 722                 last = sk_X509_num(ctx->chain) - 1;
 723         else
 724                 {
 725                 /* If checking CRL paths this isn't the EE certificate */
 726                 if (ctx->parent)
 727                         return 1;
 728                 last = 0;
 729                 }
 730         for(i = 0; i <= last; i++)
 731                 {
 732                 ctx->error_depth = i;
 733                 ok = check_cert(ctx);
 734                 if (!ok) return ok;
 735                 }
 736         return 1;
 737         }
 738
 739 static int check_cert(X509_STORE_CTX *ctx)
 740         {
 741         X509_CRL *crl = NULL, *dcrl = NULL;
 742         X509 *x;
 743         int ok, cnum;
 744         cnum = ctx->error_depth;
 745         x = sk_X509_value(ctx->chain, cnum);
 746         ctx->current_cert = x;
 747         ctx->current_issuer = NULL;
 748         ctx->current_reasons = 0;
 749         while (ctx->current_reasons != CRLDP_ALL_REASONS)
 750                 {
 751                 /* Try to retrieve relevant CRL */
 752                 if (ctx->get_crl)
 753                         ok = ctx->get_crl(ctx, &crl, x);
 754                 else
 755                         ok = get_crl_delta(ctx, &crl, &dcrl, x);
 756                 /* If error looking up CRL, nothing we can do except
 757                  * notify callback
 758                  */
 759                 if(!ok)
 760                         {
 761                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
 762                         ok = ctx->verify_cb(0, ctx);
 763                         goto err;
 764                         }
 765                 ctx->current_crl = crl;
 766                 ok = ctx->check_crl(ctx, crl);
 767                 if (!ok)
 768                         goto err;
 769
 770                 if (dcrl)
 771                         {
 772                         ok = ctx->check_crl(ctx, dcrl);
 773                         if (!ok)
 774                                 goto err;
 775                         ok = ctx->cert_crl(ctx, dcrl, x);
 776                         if (!ok)
 777                                 goto err;
 778                         }
 779                 else
 780                         ok = 1;
 781
 782                 /* Don't look in full CRL if delta reason is removefromCRL */
 783                 if (ok != 2)
 784                         {
 785                         ok = ctx->cert_crl(ctx, crl, x);
 786                         if (!ok)
 787                                 goto err;
 788                         }
 789
 790                 X509_CRL_free(crl);
 791                 X509_CRL_free(dcrl);
 792                 crl = NULL;
 793                 dcrl = NULL;
 794                 }
 795         err:
 796         X509_CRL_free(crl);
 797         X509_CRL_free(dcrl);
 798
 799         ctx->current_crl = NULL;
 800         return ok;
 801
 802         }
 803
 804 /* Check CRL times against values in X509_STORE_CTX */
 805
 806 static int check_crl_time(X509_STORE_CTX *ctx, X509_CRL *crl, int notify)
 807         {
 808         time_t *ptime;
 809         int i;
 810         if (notify)
 811                 ctx->current_crl = crl;
 812         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
 813                 ptime = &ctx->param->check_time;
 814         else
 815                 ptime = NULL;
 816
 817         i=X509_cmp_time(X509_CRL_get_lastUpdate(crl), ptime);
 818         if (i == 0)
 819                 {
 820                 if (!notify)
 821                         return 0;
 822                 ctx->error=X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD;
 823                 if (!ctx->verify_cb(0, ctx))
 824                         return 0;
 825                 }
 826
 827         if (i > 0)
 828                 {
 829                 if (!notify)
 830                         return 0;
 831                 ctx->error=X509_V_ERR_CRL_NOT_YET_VALID;
 832                 if (!ctx->verify_cb(0, ctx))
 833                         return 0;
 834                 }
 835
 836         if(X509_CRL_get_nextUpdate(crl))
 837                 {
 838                 i=X509_cmp_time(X509_CRL_get_nextUpdate(crl), ptime);
 839
 840                 if (i == 0)
 841                         {
 842                         if (!notify)
 843                                 return 0;
 844                         ctx->error=X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD;
 845                         if (!ctx->verify_cb(0, ctx))
 846                                 return 0;
 847                         }
 848                 /* Ignore expiry of base CRL is delta is valid */
 849                 if ((i < 0) && !(ctx->current_crl_score & CRL_SCORE_TIME_DELTA))
 850                         {
 851                         if (!notify)
 852                                 return 0;
 853                         ctx->error=X509_V_ERR_CRL_HAS_EXPIRED;
 854                         if (!ctx->verify_cb(0, ctx))
 855                                 return 0;
 856                         }
 857                 }
 858
 859         if (notify)
 860                 ctx->current_crl = NULL;
 861
 862         return 1;
 863         }
 864
 865 static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl,
 866                         X509 **pissuer, int *pscore, unsigned int *preasons,
 867                         STACK_OF(X509_CRL) *crls)
 868         {
 869         int i, crl_score, best_score = *pscore;
 870         unsigned int reasons, best_reasons = 0;
 871         X509 *x = ctx->current_cert;
 872         X509_CRL *crl, *best_crl = NULL;
 873         X509 *crl_issuer = NULL, *best_crl_issuer = NULL;
 874
 875         for (i = 0; i < sk_X509_CRL_num(crls); i++)
 876                 {
 877                 crl = sk_X509_CRL_value(crls, i);
 878                 reasons = *preasons;
 879                 crl_score = get_crl_score(ctx, &crl_issuer, &reasons, crl, x);
 880
 881                 if (crl_score > best_score)
 882                         {
 883                         best_crl = crl;
 884                         best_crl_issuer = crl_issuer;
 885                         best_score = crl_score;
 886                         best_reasons = reasons;
 887                         }
 888                 }
 889
 890         if (best_crl)
 891                 {
 892                 if (*pcrl)
 893                         X509_CRL_free(*pcrl);
 894                 *pcrl = best_crl;
 895                 *pissuer = best_crl_issuer;
 896                 *pscore = best_score;
 897                 *preasons = best_reasons;
 898                 CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509_CRL);
 899                 if (*pdcrl)
 900                         {
 901                         X509_CRL_free(*pdcrl);
 902                         *pdcrl = NULL;
 903                         }
 904                 get_delta_sk(ctx, pdcrl, pscore, best_crl, crls);
 905                 }
 906
 907         if (best_score >= CRL_SCORE_VALID)
 908                 return 1;
 909
 910         return 0;
 911         }
 912
 913 /* Compare two CRL extensions for delta checking purposes. They should be
 914  * both present or both absent. If both present all fields must be identical.
 915  */
 916
 917 static int crl_extension_match(X509_CRL *a, X509_CRL *b, int nid)
 918         {
 919         ASN1_OCTET_STRING *exta, *extb;
 920         int i;
 921         i = X509_CRL_get_ext_by_NID(a, nid, 0);
 922         if (i >= 0)
 923                 {
 924                 /* Can't have multiple occurrences */
 925                 if (X509_CRL_get_ext_by_NID(a, nid, i) != -1)
 926                         return 0;
 927                 exta = X509_EXTENSION_get_data(X509_CRL_get_ext(a, i));
 928                 }
 929         else
 930                 exta = NULL;
 931
 932         i = X509_CRL_get_ext_by_NID(b, nid, 0);
 933
 934         if (i >= 0)
 935                 {
 936
 937                 if (X509_CRL_get_ext_by_NID(b, nid, i) != -1)
 938                         return 0;
 939                 extb = X509_EXTENSION_get_data(X509_CRL_get_ext(b, i));
 940                 }
 941         else
 942                 extb = NULL;
 943
 944         if (!exta && !extb)
 945                 return 1;
 946
 947         if (!exta || !extb)
 948                 return 0;
 949
 950
 951         if (ASN1_OCTET_STRING_cmp(exta, extb))
 952                 return 0;
 953
 954         return 1;
 955         }
 956
 957 /* See if a base and delta are compatible */
 958
 959 static int check_delta_base(X509_CRL *delta, X509_CRL *base)
 960         {
 961         /* Delta CRL must be a delta */
 962         if (!delta->base_crl_number)
 963                         return 0;
 964         /* Base must have a CRL number */
 965         if (!base->crl_number)
 966                         return 0;
 967         /* Issuer names must match */
 968         if (X509_NAME_cmp(X509_CRL_get_issuer(base),
 969                                 X509_CRL_get_issuer(delta)))
 970                 return 0;
 971         /* AKID and IDP must match */
 972         if (!crl_extension_match(delta, base, NID_authority_key_identifier))
 973                         return 0;
 974         if (!crl_extension_match(delta, base, NID_issuing_distribution_point))
 975                         return 0;
 976         /* Delta CRL base number must not exceed Full CRL number. */
 977         if (ASN1_INTEGER_cmp(delta->base_crl_number, base->crl_number) > 0)
 978                         return 0;
 979         /* Delta CRL number must exceed full CRL number */
 980         if (ASN1_INTEGER_cmp(delta->crl_number, base->crl_number) > 0)
 981                         return 1;
 982         return 0;
 983         }
 984
 985 /* For a given base CRL find a delta... maybe extend to delta scoring
 986  * or retrieve a chain of deltas...
 987  */
 988
 989 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pscore,
 990                         X509_CRL *base, STACK_OF(X509_CRL) *crls)
 991         {
 992         X509_CRL *delta;
 993         int i;
 994         if (!(ctx->param->flags & X509_V_FLAG_USE_DELTAS))
 995                 return;
 996         if (!((ctx->current_cert->ex_flags | base->flags) & EXFLAG_FRESHEST))
 997                 return;
 998         for (i = 0; i < sk_X509_CRL_num(crls); i++)
 999                 {
1000                 delta = sk_X509_CRL_value(crls, i);
1001                 if (check_delta_base(delta, base))
1002                         {
1003                         if (check_crl_time(ctx, delta, 0))
1004                                 *pscore |= CRL_SCORE_TIME_DELTA;
1005                         CRYPTO_add(&delta->references, 1, CRYPTO_LOCK_X509_CRL);
1006                         *dcrl = delta;
1007                         return;
1008                         }
1009                 }
1010         *dcrl = NULL;
1011         }
1012
1013 /* For a given CRL return how suitable it is for the supplied certificate 'x'.
1014  * The return value is a mask of several criteria.
1015  * If the issuer is not the certificate issuer this is returned in *pissuer.
1016  * The reasons mask is also used to determine if the CRL is suitable: if
1017  * no new reasons the CRL is rejected, otherwise reasons is updated.
1018  */
1019
1020 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
1021                         unsigned int *preasons,
1022                         X509_CRL *crl, X509 *x)
1023         {
1024
1025         int crl_score = 0;
1026         unsigned int tmp_reasons = *preasons, crl_reasons;
1027
1028         /* First see if we can reject CRL straight away */
1029
1030         /* Invalid IDP cannot be processed */
1031         if (crl->idp_flags & IDP_INVALID)
1032                 return 0;
1033         /* Reason codes or indirect CRLs need extended CRL support */
1034         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1035                 {
1036                 if (crl->idp_flags & (IDP_INDIRECT | IDP_REASONS))
1037                         return 0;
1038                 }
1039         else if (crl->idp_flags & IDP_REASONS)
1040                 {
1041                 /* If no new reasons reject */
1042                 if (!(crl->idp_reasons & ~tmp_reasons))
1043                         return 0;
1044                 }
1045         /* Don't process deltas at this stage */
1046         else if (crl->base_crl_number)
1047                 return 0;
1048         /* If issuer name doesn't match certificate need indirect CRL */
1049         if (X509_NAME_cmp(X509_get_issuer_name(x), X509_CRL_get_issuer(crl)))
1050                 {
1051                 if (!(crl->idp_flags & IDP_INDIRECT))
1052                         return 0;
1053                 }
1054         else
1055                 crl_score |= CRL_SCORE_ISSUER_NAME;
1056
1057         if (!(crl->flags & EXFLAG_CRITICAL))
1058                 crl_score |= CRL_SCORE_NOCRITICAL;
1059
1060         /* Check expiry */
1061         if (check_crl_time(ctx, crl, 0))
1062                 crl_score |= CRL_SCORE_TIME;
1063
1064         /* Check authority key ID and locate certificate issuer */
1065         crl_akid_check(ctx, crl, pissuer, &crl_score);
1066
1067         /* If we can't locate certificate issuer at this point forget it */
1068
1069         if (!(crl_score & CRL_SCORE_AKID))
1070                 return 0;
1071
1072         /* Check cert for matching CRL distribution points */
1073
1074         if (crl_crldp_check(x, crl, crl_score, &crl_reasons))
1075                 {
1076                 /* If no new reasons reject */
1077                 if (!(crl_reasons & ~tmp_reasons))
1078                         return 0;
1079                 tmp_reasons |= crl_reasons;
1080                 crl_score |= CRL_SCORE_SCOPE;
1081                 }
1082
1083         *preasons = tmp_reasons;
1084
1085         return crl_score;
1086
1087         }
1088
1089 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
1090                                 X509 **pissuer, int *pcrl_score)
1091         {
1092         X509 *crl_issuer = NULL;
1093         X509_NAME *cnm = X509_CRL_get_issuer(crl);
1094         int cidx = ctx->error_depth;
1095         int i;
1096
1097         if (cidx != sk_X509_num(ctx->chain) - 1)
1098                 cidx++;
1099
1100         crl_issuer = sk_X509_value(ctx->chain, cidx);
1101
1102         if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1103                 {
1104                 if (*pcrl_score & CRL_SCORE_ISSUER_NAME)
1105                         {
1106                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_ISSUER_CERT;
1107                         *pissuer = crl_issuer;
1108                         return;
1109                         }
1110                 }
1111
1112         for (cidx++; cidx < sk_X509_num(ctx->chain); cidx++)
1113                 {
1114                 crl_issuer = sk_X509_value(ctx->chain, cidx);
1115                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1116                         continue;
1117                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1118                         {
1119                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_SAME_PATH;
1120                         *pissuer = crl_issuer;
1121                         return;
1122                         }
1123                 }
1124
1125         /* Anything else needs extended CRL support */
1126
1127         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1128                 return;
1129
1130         /* Otherwise the CRL issuer is not on the path. Look for it in the
1131          * set of untrusted certificates.
1132          */
1133         for (i = 0; i < sk_X509_num(ctx->untrusted); i++)
1134                 {
1135                 crl_issuer = sk_X509_value(ctx->untrusted, i);
1136                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1137                         continue;
1138                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1139                         {
1140                         *pissuer = crl_issuer;
1141                         *pcrl_score |= CRL_SCORE_AKID;
1142                         return;
1143                         }
1144                 }
1145         }
1146
1147 /* Check the path of a CRL issuer certificate. This creates a new
1148  * X509_STORE_CTX and populates it with most of the parameters from the
1149  * parent. This could be optimised somewhat since a lot of path checking
1150  * will be duplicated by the parent, but this will rarely be used in
1151  * practice.
1152  */
1153
1154 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x)
1155         {
1156         X509_STORE_CTX crl_ctx;
1157         int ret;
1158         /* Don't allow recursive CRL path validation */
1159         if (ctx->parent)
1160                 return 0;
1161         if (!X509_STORE_CTX_init(&crl_ctx, ctx->ctx, x, ctx->untrusted))
1162                 return -1;
1163
1164         crl_ctx.crls = ctx->crls;
1165         /* Copy verify params across */
1166         X509_STORE_CTX_set0_param(&crl_ctx, ctx->param);
1167
1168         crl_ctx.parent = ctx;
1169         crl_ctx.verify_cb = ctx->verify_cb;
1170
1171         /* Verify CRL issuer */
1172         ret = X509_verify_cert(&crl_ctx);
1173
1174         if (ret <= 0)
1175                 goto err;
1176
1177         /* Check chain is acceptable */
1178
1179         ret = check_crl_chain(ctx, ctx->chain, crl_ctx.chain);
1180         err:
1181         X509_STORE_CTX_cleanup(&crl_ctx);
1182         return ret;
1183         }
1184
1185 /* RFC3280 says nothing about the relationship between CRL path
1186  * and certificate path, which could lead to situations where a
1187  * certificate could be revoked or validated by a CA not authorised
1188  * to do so. RFC5280 is more strict and states that the two paths must
1189  * end in the same trust anchor, though some discussions remain...
1190  * until this is resolved we use the RFC5280 version
1191  */
1192
1193 static int check_crl_chain(X509_STORE_CTX *ctx,
1194                         STACK_OF(X509) *cert_path,
1195                         STACK_OF(X509) *crl_path)
1196         {
1197         X509 *cert_ta, *crl_ta;
1198         cert_ta = sk_X509_value(cert_path, sk_X509_num(cert_path) - 1);
1199         crl_ta = sk_X509_value(crl_path, sk_X509_num(crl_path) - 1);
1200         if (!X509_cmp(cert_ta, crl_ta))
1201                 return 1;
1202         return 0;
1203         }
1204
1205 /* Check for match between two dist point names: three separate cases.
1206  * 1. Both are relative names and compare X509_NAME types.
1207  * 2. One full, one relative. Compare X509_NAME to GENERAL_NAMES.
1208  * 3. Both are full names and compare two GENERAL_NAMES.
1209  * 4. One is NULL: automatic match.
1210  */
1211
1212
1213 static int idp_check_dp(DIST_POINT_NAME *a, DIST_POINT_NAME *b)
1214         {
1215         X509_NAME *nm = NULL;
1216         GENERAL_NAMES *gens = NULL;
1217         GENERAL_NAME *gena, *genb;
1218         int i, j;
1219         if (!a || !b)
1220                 return 1;
1221         if (a->type == 1)
1222                 {
1223                 if (!a->dpname)
1224                         return 0;
1225                 /* Case 1: two X509_NAME */
1226                 if (b->type == 1)
1227                         {
1228                         if (!b->dpname)
1229                                 return 0;
1230                         if (!X509_NAME_cmp(a->dpname, b->dpname))
1231                                 return 1;
1232                         else
1233                                 return 0;
1234                         }
1235                 /* Case 2: set name and GENERAL_NAMES appropriately */
1236                 nm = a->dpname;
1237                 gens = b->name.fullname;
1238                 }
1239         else if (b->type == 1)
1240                 {
1241                 if (!b->dpname)
1242                         return 0;
1243                 /* Case 2: set name and GENERAL_NAMES appropriately */
1244                 gens = a->name.fullname;
1245                 nm = b->dpname;
1246                 }
1247
1248         /* Handle case 2 with one GENERAL_NAMES and one X509_NAME */
1249         if (nm)
1250                 {
1251                 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++)
1252                         {
1253                         gena = sk_GENERAL_NAME_value(gens, i);
1254                         if (gena->type != GEN_DIRNAME)
1255                                 continue;
1256                         if (!X509_NAME_cmp(nm, gena->d.directoryName))
1257                                 return 1;
1258                         }
1259                 return 0;
1260                 }
1261
1262         /* Else case 3: two GENERAL_NAMES */
1263
1264         for (i = 0; i < sk_GENERAL_NAME_num(a->name.fullname); i++)
1265                 {
1266                 gena = sk_GENERAL_NAME_value(a->name.fullname, i);
1267                 for (j = 0; j < sk_GENERAL_NAME_num(b->name.fullname); j++)
1268                         {
1269                         genb = sk_GENERAL_NAME_value(b->name.fullname, j);
1270                         if (!GENERAL_NAME_cmp(gena, genb))
1271                                 return 1;
1272                         }
1273                 }
1274
1275         return 0;
1276
1277         }
1278
1279 static int crldp_check_crlissuer(DIST_POINT *dp, X509_CRL *crl, int crl_score)
1280         {
1281         int i;
1282         X509_NAME *nm = X509_CRL_get_issuer(crl);
1283         /* If no CRLissuer return is successful iff don't need a match */
1284         if (!dp->CRLissuer)
1285                 return !!(crl_score & CRL_SCORE_ISSUER_NAME);
1286         for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++)
1287                 {
1288                 GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
1289                 if (gen->type != GEN_DIRNAME)
1290                         continue;
1291                 if (!X509_NAME_cmp(gen->d.directoryName, nm))
1292                         return 1;
1293                 }
1294         return 0;
1295         }
1296
1297 /* Check CRLDP and IDP */
1298
1299 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
1300                                 unsigned int *preasons)
1301         {
1302         int i;
1303         if (crl->idp_flags & IDP_ONLYATTR)
1304                 return 0;
1305         if (x->ex_flags & EXFLAG_CA)
1306                 {
1307                 if (crl->idp_flags & IDP_ONLYUSER)
1308                         return 0;
1309                 }
1310         else
1311                 {
1312                 if (crl->idp_flags & IDP_ONLYCA)
1313                         return 0;
1314                 }
1315         *preasons = crl->idp_reasons;
1316         for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++)
1317                 {
1318                 DIST_POINT *dp = sk_DIST_POINT_value(x->crldp, i);
1319                 if (crldp_check_crlissuer(dp, crl, crl_score))
1320                         {
1321                         if (!crl->idp ||
1322                              idp_check_dp(dp->distpoint, crl->idp->distpoint))
1323                                 {
1324                                 *preasons &= dp->dp_reasons;
1325                                 return 1;
1326                                 }
1327                         }
1328                 }
1329         if ((!crl->idp || !crl->idp->distpoint) && (crl_score & CRL_SCORE_ISSUER_NAME))
1330                 return 1;
1331         return 0;
1332         }
1333
1334 /* Retrieve CRL corresponding to current certificate.
1335  * If deltas enabled try to find a delta CRL too
1336  */
1337
1338 static int get_crl_delta(X509_STORE_CTX *ctx,
1339                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)
1340         {
1341         int ok;
1342         X509 *issuer = NULL;
1343         int crl_score = 0;
1344         unsigned int reasons;
1345         X509_CRL *crl = NULL, *dcrl = NULL;
1346         STACK_OF(X509_CRL) *skcrl;
1347         X509_NAME *nm = X509_get_issuer_name(x);
1348         reasons = ctx->current_reasons;
1349         ok = get_crl_sk(ctx, &crl, &dcrl,
1350                                 &issuer, &crl_score, &reasons, ctx->crls);
1351
1352         if (ok)
1353                 goto done;
1354
1355         /* Lookup CRLs from store */
1356
1357         skcrl = ctx->lookup_crls(ctx, nm);
1358
1359         /* If no CRLs found and a near match from get_crl_sk use that */
1360         if (!skcrl && crl)
1361                 goto done;
1362
1363         get_crl_sk(ctx, &crl, &dcrl, &issuer, &crl_score, &reasons, skcrl);
1364
1365         sk_X509_CRL_pop_free(skcrl, X509_CRL_free);
1366
1367         done:
1368
1369         /* If we got any kind of CRL use it and return success */
1370         if (crl)
1371                 {
1372                 ctx->current_issuer = issuer;
1373                 ctx->current_crl_score = crl_score;
1374                 ctx->current_reasons = reasons;
1375                 *pcrl = crl;
1376                 *pdcrl = dcrl;
1377                 return 1;
1378                 }
1379
1380         return 0;
1381         }
1382
1383 /* Check CRL validity */
1384 static int check_crl(X509_STORE_CTX *ctx, X509_CRL *crl)
1385         {
1386         X509 *issuer = NULL;
1387         EVP_PKEY *ikey = NULL;
1388         int ok = 0, chnum, cnum;
1389         cnum = ctx->error_depth;
1390         chnum = sk_X509_num(ctx->chain) - 1;
1391         /* if we have an alternative CRL issuer cert use that */
1392         if (ctx->current_issuer)
1393                 issuer = ctx->current_issuer;
1394
1395         /* Else find CRL issuer: if not last certificate then issuer
1396          * is next certificate in chain.
1397          */
1398         else if (cnum < chnum)
1399                 issuer = sk_X509_value(ctx->chain, cnum + 1);
1400         else
1401                 {
1402                 issuer = sk_X509_value(ctx->chain, chnum);
1403                 /* If not self signed, can't check signature */
1404                 if(!ctx->check_issued(ctx, issuer, issuer))
1405                         {
1406                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER;
1407                         ok = ctx->verify_cb(0, ctx);
1408                         if(!ok) goto err;
1409                         }
1410                 }
1411
1412         if(issuer)
1413                 {
1414                 /* Skip most tests for deltas because they have already
1415                  * been done
1416                  */
1417                 if (!crl->base_crl_number)
1418                         {
1419                         /* Check for cRLSign bit if keyUsage present */
1420                         if ((issuer->ex_flags & EXFLAG_KUSAGE) &&
1421                                 !(issuer->ex_kusage & KU_CRL_SIGN))
1422                                 {
1423                                 ctx->error = X509_V_ERR_KEYUSAGE_NO_CRL_SIGN;
1424                                 ok = ctx->verify_cb(0, ctx);
1425                                 if(!ok) goto err;
1426                                 }
1427
1428                         if (!(ctx->current_crl_score & CRL_SCORE_SCOPE))
1429                                 {
1430                                 ctx->error = X509_V_ERR_DIFFERENT_CRL_SCOPE;
1431                                 ok = ctx->verify_cb(0, ctx);
1432                                 if(!ok) goto err;
1433                                 }
1434
1435                         if (!(ctx->current_crl_score & CRL_SCORE_SAME_PATH))
1436                                 {
1437                                 if (check_crl_path(ctx, ctx->current_issuer) <= 0)
1438                                         {
1439                                         ctx->error = X509_V_ERR_CRL_PATH_VALIDATION_ERROR;
1440                                         ok = ctx->verify_cb(0, ctx);
1441                                         if(!ok) goto err;
1442                                         }
1443                                 }
1444
1445                         if (crl->idp_flags & IDP_INVALID)
1446                                 {
1447                                 ctx->error = X509_V_ERR_INVALID_EXTENSION;
1448                                 ok = ctx->verify_cb(0, ctx);
1449                                 if(!ok) goto err;
1450                                 }
1451
1452
1453                         }
1454
1455                 if (!(ctx->current_crl_score & CRL_SCORE_TIME))
1456                         {
1457                         ok = check_crl_time(ctx, crl, 1);
1458                         if (!ok)
1459                                 goto err;
1460                         }
1461
1462                 /* Attempt to get issuer certificate public key */
1463                 ikey = X509_get_pubkey(issuer);
1464
1465                 if(!ikey)
1466                         {
1467                         ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1468                         ok = ctx->verify_cb(0, ctx);
1469                         if (!ok) goto err;
1470                         }
1471                 else
1472                         {
1473                         /* Verify CRL signature */
1474                         if(X509_CRL_verify(crl, ikey) <= 0)
1475                                 {
1476                                 ctx->error=X509_V_ERR_CRL_SIGNATURE_FAILURE;
1477                                 ok = ctx->verify_cb(0, ctx);
1478                                 if (!ok) goto err;
1479                                 }
1480                         }
1481                 }
1482
1483         ok = 1;
1484
1485         err:
1486         EVP_PKEY_free(ikey);
1487         return ok;
1488         }
1489
1490 /* Check certificate against CRL */
1491 static int cert_crl(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x)
1492         {
1493         int ok;
1494         X509_REVOKED *rev;
1495         /* The rules changed for this... previously if a CRL contained
1496          * unhandled critical extensions it could still be used to indicate
1497          * a certificate was revoked. This has since been changed since
1498          * critical extension can change the meaning of CRL entries.
1499          */
1500         if (crl->flags & EXFLAG_CRITICAL)
1501                 {
1502                 if (ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
1503                         return 1;
1504                 ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION;
1505                 ok = ctx->verify_cb(0, ctx);
1506                 if(!ok)
1507                         return 0;
1508                 }
1509         /* Look for serial number of certificate in CRL
1510          * If found make sure reason is not removeFromCRL.
1511          */
1512         if (X509_CRL_get0_by_cert(crl, &rev, x))
1513                 {
1514                 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
1515                         return 2;
1516                 ctx->error = X509_V_ERR_CERT_REVOKED;
1517                 ok = ctx->verify_cb(0, ctx);
1518                 if (!ok)
1519                         return 0;
1520                 }
1521
1522         return 1;
1523         }
1524
1525 static int check_policy(X509_STORE_CTX *ctx)
1526         {
1527         int ret;
1528         if (ctx->parent)
1529                 return 1;
1530         ret = X509_policy_check(&ctx->tree, &ctx->explicit_policy, ctx->chain,
1531                                 ctx->param->policies, ctx->param->flags);
1532         if (ret == 0)
1533                 {
1534                 X509err(X509_F_CHECK_POLICY,ERR_R_MALLOC_FAILURE);
1535                 return 0;
1536                 }
1537         /* Invalid or inconsistent extensions */
1538         if (ret == -1)
1539                 {
1540                 /* Locate certificates with bad extensions and notify
1541                  * callback.
1542                  */
1543                 X509 *x;
1544                 int i;
1545                 for (i = 1; i < sk_X509_num(ctx->chain); i++)
1546                         {
1547                         x = sk_X509_value(ctx->chain, i);
1548                         if (!(x->ex_flags & EXFLAG_INVALID_POLICY))
1549                                 continue;
1550                         ctx->current_cert = x;
1551                         ctx->error = X509_V_ERR_INVALID_POLICY_EXTENSION;
1552                         if(!ctx->verify_cb(0, ctx))
1553                                 return 0;
1554                         }
1555                 return 1;
1556                 }
1557         if (ret == -2)
1558                 {
1559                 ctx->current_cert = NULL;
1560                 ctx->error = X509_V_ERR_NO_EXPLICIT_POLICY;
1561                 return ctx->verify_cb(0, ctx);
1562                 }
1563
1564         if (ctx->param->flags & X509_V_FLAG_NOTIFY_POLICY)
1565                 {
1566                 ctx->current_cert = NULL;
1567                 ctx->error = X509_V_OK;
1568                 if (!ctx->verify_cb(2, ctx))
1569                         return 0;
1570                 }
1571
1572         return 1;
1573         }
1574
1575 static int check_cert_time(X509_STORE_CTX *ctx, X509 *x)
1576         {
1577         time_t *ptime;
1578         int i;
1579
1580         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
1581                 ptime = &ctx->param->check_time;
1582         else
1583                 ptime = NULL;
1584
1585         i=X509_cmp_time(X509_get_notBefore(x), ptime);
1586         if (i == 0)
1587                 {
1588                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
1589                 ctx->current_cert=x;
1590                 if (!ctx->verify_cb(0, ctx))
1591                         return 0;
1592                 }
1593
1594         if (i > 0)
1595                 {
1596                 ctx->error=X509_V_ERR_CERT_NOT_YET_VALID;
1597                 ctx->current_cert=x;
1598                 if (!ctx->verify_cb(0, ctx))
1599                         return 0;
1600                 }
1601
1602         i=X509_cmp_time(X509_get_notAfter(x), ptime);
1603         if (i == 0)
1604                 {
1605                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
1606                 ctx->current_cert=x;
1607                 if (!ctx->verify_cb(0, ctx))
1608                         return 0;
1609                 }
1610
1611         if (i < 0)
1612                 {
1613                 ctx->error=X509_V_ERR_CERT_HAS_EXPIRED;
1614                 ctx->current_cert=x;
1615                 if (!ctx->verify_cb(0, ctx))
1616                         return 0;
1617                 }
1618
1619         return 1;
1620         }
1621
1622 static int internal_verify(X509_STORE_CTX *ctx)
1623         {
1624         int ok=0,n;
1625         X509 *xs,*xi;
1626         EVP_PKEY *pkey=NULL;
1627         int (*cb)(int xok,X509_STORE_CTX *xctx);
1628
1629         cb=ctx->verify_cb;
1630
1631         n=sk_X509_num(ctx->chain);
1632         ctx->error_depth=n-1;
1633         n--;
1634         xi=sk_X509_value(ctx->chain,n);
1635
1636         if (ctx->check_issued(ctx, xi, xi))
1637                 xs=xi;
1638         else
1639                 {
1640                 if (n <= 0)
1641                         {
1642                         ctx->error=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
1643                         ctx->current_cert=xi;
1644                         ok=cb(0,ctx);
1645                         goto end;
1646                         }
1647                 else
1648                         {
1649                         n--;
1650                         ctx->error_depth=n;
1651                         xs=sk_X509_value(ctx->chain,n);
1652                         }
1653                 }
1654
1655 /*      ctx->error=0;  not needed */
1656         while (n >= 0)
1657                 {
1658                 ctx->error_depth=n;
1659
1660                 /* Skip signature check for self signed certificates unless
1661                  * explicitly asked for. It doesn't add any security and
1662                  * just wastes time.
1663                  */
1664                 if (!xs->valid && (xs != xi || (ctx->param->flags & X509_V_FLAG_CHECK_SS_SIGNATURE)))
1665                         {
1666                         if ((pkey=X509_get_pubkey(xi)) == NULL)
1667                                 {
1668                                 ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1669                                 ctx->current_cert=xi;
1670                                 ok=(*cb)(0,ctx);
1671                                 if (!ok) goto end;
1672                                 }
1673                         else if (X509_verify(xs,pkey) <= 0)
1674                                 {
1675                                 ctx->error=X509_V_ERR_CERT_SIGNATURE_FAILURE;
1676                                 ctx->current_cert=xs;
1677                                 ok=(*cb)(0,ctx);
1678                                 if (!ok)
1679                                         {
1680                                         EVP_PKEY_free(pkey);
1681                                         goto end;
1682                                         }
1683                                 }
1684                         EVP_PKEY_free(pkey);
1685                         pkey=NULL;
1686                         }
1687
1688                 xs->valid = 1;
1689
1690                 ok = check_cert_time(ctx, xs);
1691                 if (!ok)
1692                         goto end;
1693
1694                 /* The last error (if any) is still in the error value */
1695                 ctx->current_issuer=xi;
1696                 ctx->current_cert=xs;
1697                 ok=(*cb)(1,ctx);
1698                 if (!ok) goto end;
1699
1700                 n--;
1701                 if (n >= 0)
1702                         {
1703                         xi=xs;
1704                         xs=sk_X509_value(ctx->chain,n);
1705                         }
1706                 }
1707         ok=1;
1708 end:
1709         return ok;
1710         }
1711
1712 int X509_cmp_current_time(const ASN1_TIME *ctm)
1713 {
1714         return X509_cmp_time(ctm, NULL);
1715 }
1716
1717 int X509_cmp_time(const ASN1_TIME *ctm, time_t *cmp_time)
1718         {
1719         char *str;
1720         ASN1_TIME atm;
1721         long offset;
1722         char buff1[24],buff2[24],*p;
1723         int i,j;
1724
1725         p=buff1;
1726         i=ctm->length;
1727         str=(char *)ctm->data;
1728         if (ctm->type == V_ASN1_UTCTIME)
1729                 {
1730                 if ((i < 11) || (i > 17)) return 0;
1731                 memcpy(p,str,10);
1732                 p+=10;
1733                 str+=10;
1734                 }
1735         else
1736                 {
1737                 if (i < 13) return 0;
1738                 memcpy(p,str,12);
1739                 p+=12;
1740                 str+=12;
1741                 }
1742
1743         if ((*str == 'Z') || (*str == '-') || (*str == '+'))
1744                 { *(p++)='0'; *(p++)='0'; }
1745         else
1746                 {
1747                 *(p++)= *(str++);
1748                 *(p++)= *(str++);
1749                 /* Skip any fractional seconds... */
1750                 if (*str == '.')
1751                         {
1752                         str++;
1753                         while ((*str >= '0') && (*str <= '9')) str++;
1754                         }
1755
1756                 }
1757         *(p++)='Z';
1758         *(p++)='\0';
1759
1760         if (*str == 'Z')
1761                 offset=0;
1762         else
1763                 {
1764                 if ((*str != '+') && (*str != '-'))
1765                         return 0;
1766                 offset=((str[1]-'0')*10+(str[2]-'0'))*60;
1767                 offset+=(str[3]-'0')*10+(str[4]-'0');
1768                 if (*str == '-')
1769                         offset= -offset;
1770                 }
1771         atm.type=ctm->type;
1772         atm.flags = 0;
1773         atm.length=sizeof(buff2);
1774         atm.data=(unsigned char *)buff2;
1775
1776         if (X509_time_adj(&atm,-offset*60, cmp_time) == NULL)
1777                 return 0;
1778
1779         if (ctm->type == V_ASN1_UTCTIME)
1780                 {
1781                 i=(buff1[0]-'0')*10+(buff1[1]-'0');
1782                 if (i < 50) i+=100; /* cf. RFC 2459 */
1783                 j=(buff2[0]-'0')*10+(buff2[1]-'0');
1784                 if (j < 50) j+=100;
1785
1786                 if (i < j) return -1;
1787                 if (i > j) return 1;
1788                 }
1789         i=strcmp(buff1,buff2);
1790         if (i == 0) /* wait a second then return younger :-) */
1791                 return -1;
1792         else
1793                 return i;
1794         }
1795
1796 ASN1_TIME *X509_gmtime_adj(ASN1_TIME *s, long adj)
1797 {
1798         return X509_time_adj(s, adj, NULL);
1799 }
1800
1801 ASN1_TIME *X509_time_adj(ASN1_TIME *s, long offset_sec, time_t *in_tm)
1802         {
1803         return X509_time_adj_ex(s, 0, offset_sec, in_tm);
1804         }
1805
1806 ASN1_TIME *X509_time_adj_ex(ASN1_TIME *s,
1807                                 int offset_day, long offset_sec, time_t *in_tm)
1808         {
1809         time_t t;
1810
1811         if (in_tm) t = *in_tm;
1812         else time(&t);
1813
1814         if (s && !(s->flags & ASN1_STRING_FLAG_MSTRING))
1815                 {
1816                 if (s->type == V_ASN1_UTCTIME)
1817                         return ASN1_UTCTIME_adj(s,t, offset_day, offset_sec);
1818                 if (s->type == V_ASN1_GENERALIZEDTIME)
1819                         return ASN1_GENERALIZEDTIME_adj(s, t, offset_day,
1820                                                                 offset_sec);
1821                 }
1822         return ASN1_TIME_adj(s, t, offset_day, offset_sec);
1823         }
1824
1825 int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain)
1826         {
1827         EVP_PKEY *ktmp=NULL,*ktmp2;
1828         int i,j;
1829
1830         if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) return 1;
1831
1832         for (i=0; i<sk_X509_num(chain); i++)
1833                 {
1834                 ktmp=X509_get_pubkey(sk_X509_value(chain,i));
1835                 if (ktmp == NULL)
1836                         {
1837                         X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
1838                         return 0;
1839                         }
1840                 if (!EVP_PKEY_missing_parameters(ktmp))
1841                         break;
1842                 else
1843                         {
1844                         EVP_PKEY_free(ktmp);
1845                         ktmp=NULL;
1846                         }
1847                 }
1848         if (ktmp == NULL)
1849                 {
1850                 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
1851                 return 0;
1852                 }
1853
1854         /* first, populate the other certs */
1855         for (j=i-1; j >= 0; j--)
1856                 {
1857                 ktmp2=X509_get_pubkey(sk_X509_value(chain,j));
1858                 EVP_PKEY_copy_parameters(ktmp2,ktmp);
1859                 EVP_PKEY_free(ktmp2);
1860                 }
1861
1862         if (pkey != NULL) EVP_PKEY_copy_parameters(pkey,ktmp);
1863         EVP_PKEY_free(ktmp);
1864         return 1;
1865         }
1866
1867 int X509_STORE_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
1868              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
1869         {
1870         /* This function is (usually) called only once, by
1871          * SSL_get_ex_data_X509_STORE_CTX_idx (ssl/ssl_cert.c). */
1872         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_X509_STORE_CTX, argl, argp,
1873                         new_func, dup_func, free_func);
1874         }
1875
1876 int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data)
1877         {
1878         return CRYPTO_set_ex_data(&ctx->ex_data,idx,data);
1879         }
1880
1881 void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx)
1882         {
1883         return CRYPTO_get_ex_data(&ctx->ex_data,idx);
1884         }
1885
1886 int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx)
1887         {
1888         return ctx->error;
1889         }
1890
1891 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err)
1892         {
1893         ctx->error=err;
1894         }
1895
1896 int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx)
1897         {
1898         return ctx->error_depth;
1899         }
1900
1901 X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx)
1902         {
1903         return ctx->current_cert;
1904         }
1905
1906 STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx)
1907         {
1908         return ctx->chain;
1909         }
1910
1911 STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx)
1912         {
1913         int i;
1914         X509 *x;
1915         STACK_OF(X509) *chain;
1916         if (!ctx->chain || !(chain = sk_X509_dup(ctx->chain))) return NULL;
1917         for (i = 0; i < sk_X509_num(chain); i++)
1918                 {
1919                 x = sk_X509_value(chain, i);
1920                 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1921                 }
1922         return chain;
1923         }
1924
1925 X509 *X509_STORE_CTX_get0_current_issuer(X509_STORE_CTX *ctx)
1926         {
1927         return ctx->current_issuer;
1928         }
1929
1930 X509_CRL *X509_STORE_CTX_get0_current_crl(X509_STORE_CTX *ctx)
1931         {
1932         return ctx->current_crl;
1933         }
1934
1935 X509_STORE_CTX *X509_STORE_CTX_get0_parent_ctx(X509_STORE_CTX *ctx)
1936         {
1937         return ctx->parent;
1938         }
1939
1940 void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x)
1941         {
1942         ctx->cert=x;
1943         }
1944
1945 void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
1946         {
1947         ctx->untrusted=sk;
1948         }
1949
1950 void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk)
1951         {
1952         ctx->crls=sk;
1953         }
1954
1955 int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose)
1956         {
1957         return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0);
1958         }
1959
1960 int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust)
1961         {
1962         return X509_STORE_CTX_purpose_inherit(ctx, 0, 0, trust);
1963         }
1964
1965 /* This function is used to set the X509_STORE_CTX purpose and trust
1966  * values. This is intended to be used when another structure has its
1967  * own trust and purpose values which (if set) will be inherited by
1968  * the ctx. If they aren't set then we will usually have a default
1969  * purpose in mind which should then be used to set the trust value.
1970  * An example of this is SSL use: an SSL structure will have its own
1971  * purpose and trust settings which the application can set: if they
1972  * aren't set then we use the default of SSL client/server.
1973  */
1974
1975 int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
1976                                 int purpose, int trust)
1977 {
1978         int idx;
1979         /* If purpose not set use default */
1980         if (!purpose) purpose = def_purpose;
1981         /* If we have a purpose then check it is valid */
1982         if (purpose)
1983                 {
1984                 X509_PURPOSE *ptmp;
1985                 idx = X509_PURPOSE_get_by_id(purpose);
1986                 if (idx == -1)
1987                         {
1988                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
1989                                                 X509_R_UNKNOWN_PURPOSE_ID);
1990                         return 0;
1991                         }
1992                 ptmp = X509_PURPOSE_get0(idx);
1993                 if (ptmp->trust == X509_TRUST_DEFAULT)
1994                         {
1995                         idx = X509_PURPOSE_get_by_id(def_purpose);
1996                         if (idx == -1)
1997                                 {
1998                                 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
1999                                                 X509_R_UNKNOWN_PURPOSE_ID);
2000                                 return 0;
2001                                 }
2002                         ptmp = X509_PURPOSE_get0(idx);
2003                         }
2004                 /* If trust not set then get from purpose default */
2005                 if (!trust) trust = ptmp->trust;
2006                 }
2007         if (trust)
2008                 {
2009                 idx = X509_TRUST_get_by_id(trust);
2010                 if (idx == -1)
2011                         {
2012                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2013                                                 X509_R_UNKNOWN_TRUST_ID);
2014                         return 0;
2015                         }
2016                 }
2017
2018         if (purpose && !ctx->param->purpose) ctx->param->purpose = purpose;
2019         if (trust && !ctx->param->trust) ctx->param->trust = trust;
2020         return 1;
2021 }
2022
2023 X509_STORE_CTX *X509_STORE_CTX_new(void)
2024 {
2025         X509_STORE_CTX *ctx;
2026         ctx = (X509_STORE_CTX *)OPENSSL_malloc(sizeof(X509_STORE_CTX));
2027         if (!ctx)
2028                 {
2029                 X509err(X509_F_X509_STORE_CTX_NEW,ERR_R_MALLOC_FAILURE);
2030                 return NULL;
2031                 }
2032         memset(ctx, 0, sizeof(X509_STORE_CTX));
2033         return ctx;
2034 }
2035
2036 void X509_STORE_CTX_free(X509_STORE_CTX *ctx)
2037 {
2038         X509_STORE_CTX_cleanup(ctx);
2039         OPENSSL_free(ctx);
2040 }
2041
2042 int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store, X509 *x509,
2043              STACK_OF(X509) *chain)
2044         {
2045         int ret = 1;
2046         ctx->ctx=store;
2047         ctx->current_method=0;
2048         ctx->cert=x509;
2049         ctx->untrusted=chain;
2050         ctx->crls = NULL;
2051         ctx->last_untrusted=0;
2052         ctx->other_ctx=NULL;
2053         ctx->valid=0;
2054         ctx->chain=NULL;
2055         ctx->error=0;
2056         ctx->explicit_policy=0;
2057         ctx->error_depth=0;
2058         ctx->current_cert=NULL;
2059         ctx->current_issuer=NULL;
2060         ctx->tree = NULL;
2061         ctx->parent = NULL;
2062
2063         ctx->param = X509_VERIFY_PARAM_new();
2064
2065         if (!ctx->param)
2066                 {
2067                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2068                 return 0;
2069                 }
2070
2071         /* Inherit callbacks and flags from X509_STORE if not set
2072          * use defaults.
2073          */
2074
2075
2076         if (store)
2077                 ret = X509_VERIFY_PARAM_inherit(ctx->param, store->param);
2078         else
2079                 ctx->param->inh_flags |= X509_VP_FLAG_DEFAULT|X509_VP_FLAG_ONCE;
2080
2081         if (store)
2082                 {
2083                 ctx->verify_cb = store->verify_cb;
2084                 ctx->cleanup = store->cleanup;
2085                 }
2086         else
2087                 ctx->cleanup = 0;
2088
2089         if (ret)
2090                 ret = X509_VERIFY_PARAM_inherit(ctx->param,
2091                                         X509_VERIFY_PARAM_lookup("default"));
2092
2093         if (ret == 0)
2094                 {
2095                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2096                 return 0;
2097                 }
2098
2099         if (store && store->check_issued)
2100                 ctx->check_issued = store->check_issued;
2101         else
2102                 ctx->check_issued = check_issued;
2103
2104         if (store && store->get_issuer)
2105                 ctx->get_issuer = store->get_issuer;
2106         else
2107                 ctx->get_issuer = X509_STORE_CTX_get1_issuer;
2108
2109         if (store && store->verify_cb)
2110                 ctx->verify_cb = store->verify_cb;
2111         else
2112                 ctx->verify_cb = null_callback;
2113
2114         if (store && store->verify)
2115                 ctx->verify = store->verify;
2116         else
2117                 ctx->verify = internal_verify;
2118
2119         if (store && store->check_revocation)
2120                 ctx->check_revocation = store->check_revocation;
2121         else
2122                 ctx->check_revocation = check_revocation;
2123
2124         if (store && store->get_crl)
2125                 ctx->get_crl = store->get_crl;
2126         else
2127                 ctx->get_crl = NULL;
2128
2129         if (store && store->check_crl)
2130                 ctx->check_crl = store->check_crl;
2131         else
2132                 ctx->check_crl = check_crl;
2133
2134         if (store && store->cert_crl)
2135                 ctx->cert_crl = store->cert_crl;
2136         else
2137                 ctx->cert_crl = cert_crl;
2138
2139         if (store && store->lookup_certs)
2140                 ctx->lookup_certs = store->lookup_certs;
2141         else
2142                 ctx->lookup_certs = X509_STORE_get1_certs;
2143
2144         if (store && store->lookup_crls)
2145                 ctx->lookup_crls = store->lookup_crls;
2146         else
2147                 ctx->lookup_crls = X509_STORE_get1_crls;
2148
2149         ctx->check_policy = check_policy;
2150
2151
2152         /* This memset() can't make any sense anyway, so it's removed. As
2153          * X509_STORE_CTX_cleanup does a proper "free" on the ex_data, we put a
2154          * corresponding "new" here and remove this bogus initialisation. */
2155         /* memset(&(ctx->ex_data),0,sizeof(CRYPTO_EX_DATA)); */
2156         if(!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx,
2157                                 &(ctx->ex_data)))
2158                 {
2159                 OPENSSL_free(ctx);
2160                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2161                 return 0;
2162                 }
2163         return 1;
2164         }
2165
2166 /* Set alternative lookup method: just a STACK of trusted certificates.
2167  * This avoids X509_STORE nastiness where it isn't needed.
2168  */
2169
2170 void X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2171 {
2172         ctx->other_ctx = sk;
2173         ctx->get_issuer = get_issuer_sk;
2174 }
2175
2176 void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx)
2177         {
2178         if (ctx->cleanup) ctx->cleanup(ctx);
2179         if (ctx->param != NULL)
2180                 {
2181                 if (ctx->parent == NULL)
2182                         X509_VERIFY_PARAM_free(ctx->param);
2183                 ctx->param=NULL;
2184                 }
2185         if (ctx->tree != NULL)
2186                 {
2187                 X509_policy_tree_free(ctx->tree);
2188                 ctx->tree=NULL;
2189                 }
2190         if (ctx->chain != NULL)
2191                 {
2192                 sk_X509_pop_free(ctx->chain,X509_free);
2193                 ctx->chain=NULL;
2194                 }
2195         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, &(ctx->ex_data));
2196         memset(&ctx->ex_data,0,sizeof(CRYPTO_EX_DATA));
2197         }
2198
2199 void X509_STORE_CTX_set_depth(X509_STORE_CTX *ctx, int depth)
2200         {
2201         X509_VERIFY_PARAM_set_depth(ctx->param, depth);
2202         }
2203
2204 void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, unsigned long flags)
2205         {
2206         X509_VERIFY_PARAM_set_flags(ctx->param, flags);
2207         }
2208
2209 void X509_STORE_CTX_set_time(X509_STORE_CTX *ctx, unsigned long flags, time_t t)
2210         {
2211         X509_VERIFY_PARAM_set_time(ctx->param, t);
2212         }
2213
2214 void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx,
2215                                   int (*verify_cb)(int, X509_STORE_CTX *))
2216         {
2217         ctx->verify_cb=verify_cb;
2218         }
2219
2220 X509_POLICY_TREE *X509_STORE_CTX_get0_policy_tree(X509_STORE_CTX *ctx)
2221         {
2222         return ctx->tree;
2223         }
2224
2225 int X509_STORE_CTX_get_explicit_policy(X509_STORE_CTX *ctx)
2226         {
2227         return ctx->explicit_policy;
2228         }
2229
2230 int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name)
2231         {
2232         const X509_VERIFY_PARAM *param;
2233         param = X509_VERIFY_PARAM_lookup(name);
2234         if (!param)
2235                 return 0;
2236         return X509_VERIFY_PARAM_inherit(ctx->param, param);
2237         }
2238
2239 X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx)
2240         {
2241         return ctx->param;
2242         }
2243
2244 void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param)
2245         {
2246         if (ctx->param)
2247                 X509_VERIFY_PARAM_free(ctx->param);
2248         ctx->param = param;
2249         }
2250
2251 IMPLEMENT_STACK_OF(X509)
2252 IMPLEMENT_ASN1_SET_OF(X509)
2253
2254 IMPLEMENT_STACK_OF(X509_NAME)
2255
2256 IMPLEMENT_STACK_OF(X509_ATTRIBUTE)
2257 IMPLEMENT_ASN1_SET_OF(X509_ATTRIBUTE)