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         i = X509_chain_check_suiteb(&ctx->error_depth, NULL, ctx->chain,
 391                                                         ctx->param->flags);
 392         if (i != X509_V_OK)
 393                 {
 394                 ctx->error = i;
 395                 ctx->current_cert = sk_X509_value(ctx->chain, ctx->error_depth);
 396                 ok = cb(0, ctx);
 397                 if (!ok)
 398                         goto end;
 399                 }
 400
 401         /* At this point, we have a chain and need to verify it */
 402         if (ctx->verify != NULL)
 403                 ok=ctx->verify(ctx);
 404         else
 405                 ok=internal_verify(ctx);
 406         if(!ok) goto end;
 407
 408 #ifndef OPENSSL_NO_RFC3779
 409         /* RFC 3779 path validation, now that CRL check has been done */
 410         ok = v3_asid_validate_path(ctx);
 411         if (!ok) goto end;
 412         ok = v3_addr_validate_path(ctx);
 413         if (!ok) goto end;
 414 #endif
 415
 416         /* If we get this far evaluate policies */
 417         if (!bad_chain && (ctx->param->flags & X509_V_FLAG_POLICY_CHECK))
 418                 ok = ctx->check_policy(ctx);
 419         if(!ok) goto end;
 420         if (0)
 421                 {
 422 end:
 423                 X509_get_pubkey_parameters(NULL,ctx->chain);
 424                 }
 425         if (sktmp != NULL) sk_X509_free(sktmp);
 426         if (chain_ss != NULL) X509_free(chain_ss);
 427         return ok;
 428         }
 429
 430
 431 /* Given a STACK_OF(X509) find the issuer of cert (if any)
 432  */
 433
 434 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x)
 435 {
 436         int i;
 437         X509 *issuer;
 438         for (i = 0; i < sk_X509_num(sk); i++)
 439                 {
 440                 issuer = sk_X509_value(sk, i);
 441                 if (ctx->check_issued(ctx, x, issuer))
 442                         return issuer;
 443                 }
 444         return NULL;
 445 }
 446
 447 /* Given a possible certificate and issuer check them */
 448
 449 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer)
 450 {
 451         int ret;
 452         ret = X509_check_issued(issuer, x);
 453         if (ret == X509_V_OK)
 454                 {
 455                 int i;
 456                 X509 *ch;
 457                 /* Special case: single self signed certificate */
 458                 if (cert_self_signed(x) && sk_X509_num(ctx->chain) == 1)
 459                         return 1;
 460                 for (i = 0; i < sk_X509_num(ctx->chain); i++)
 461                         {
 462                         ch = sk_X509_value(ctx->chain, i);
 463                         if (ch == issuer || !X509_cmp(ch, issuer))
 464                                 {
 465                                 ret = X509_V_ERR_PATH_LOOP;
 466                                 break;
 467                                 }
 468                         }
 469                 }
 470
 471         if (ret == X509_V_OK)
 472                 return 1;
 473         /* If we haven't asked for issuer errors don't set ctx */
 474         if (!(ctx->param->flags & X509_V_FLAG_CB_ISSUER_CHECK))
 475                 return 0;
 476
 477         ctx->error = ret;
 478         ctx->current_cert = x;
 479         ctx->current_issuer = issuer;
 480         return ctx->verify_cb(0, ctx);
 481         return 0;
 482 }
 483
 484 /* Alternative lookup method: look from a STACK stored in other_ctx */
 485
 486 static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
 487 {
 488         *issuer = find_issuer(ctx, ctx->other_ctx, x);
 489         if (*issuer)
 490                 {
 491                 CRYPTO_add(&(*issuer)->references,1,CRYPTO_LOCK_X509);
 492                 return 1;
 493                 }
 494         else
 495                 return 0;
 496 }
 497
 498
 499 /* Check a certificate chains extensions for consistency
 500  * with the supplied purpose
 501  */
 502
 503 static int check_chain_extensions(X509_STORE_CTX *ctx)
 504 {
 505 #ifdef OPENSSL_NO_CHAIN_VERIFY
 506         return 1;
 507 #else
 508         int i, ok=0, must_be_ca, plen = 0;
 509         X509 *x;
 510         int (*cb)(int xok,X509_STORE_CTX *xctx);
 511         int proxy_path_length = 0;
 512         int purpose;
 513         int allow_proxy_certs;
 514         cb=ctx->verify_cb;
 515
 516         /* must_be_ca can have 1 of 3 values:
 517            -1: we accept both CA and non-CA certificates, to allow direct
 518                use of self-signed certificates (which are marked as CA).
 519            0:  we only accept non-CA certificates.  This is currently not
 520                used, but the possibility is present for future extensions.
 521            1:  we only accept CA certificates.  This is currently used for
 522                all certificates in the chain except the leaf certificate.
 523         */
 524         must_be_ca = -1;
 525
 526         /* CRL path validation */
 527         if (ctx->parent)
 528                 {
 529                 allow_proxy_certs = 0;
 530                 purpose = X509_PURPOSE_CRL_SIGN;
 531                 }
 532         else
 533                 {
 534                 allow_proxy_certs =
 535                         !!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
 536                 /* A hack to keep people who don't want to modify their
 537                    software happy */
 538                 if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
 539                         allow_proxy_certs = 1;
 540                 purpose = ctx->param->purpose;
 541                 }
 542
 543         /* Check all untrusted certificates */
 544         for (i = 0; i < ctx->last_untrusted; i++)
 545                 {
 546                 int ret;
 547                 x = sk_X509_value(ctx->chain, i);
 548                 if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
 549                         && (x->ex_flags & EXFLAG_CRITICAL))
 550                         {
 551                         ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;
 552                         ctx->error_depth = i;
 553                         ctx->current_cert = x;
 554                         ok=cb(0,ctx);
 555                         if (!ok) goto end;
 556                         }
 557                 if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY))
 558                         {
 559                         ctx->error = X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED;
 560                         ctx->error_depth = i;
 561                         ctx->current_cert = x;
 562                         ok=cb(0,ctx);
 563                         if (!ok) goto end;
 564                         }
 565                 ret = X509_check_ca(x);
 566                 switch(must_be_ca)
 567                         {
 568                 case -1:
 569                         if ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 570                                 && (ret != 1) && (ret != 0))
 571                                 {
 572                                 ret = 0;
 573                                 ctx->error = X509_V_ERR_INVALID_CA;
 574                                 }
 575                         else
 576                                 ret = 1;
 577                         break;
 578                 case 0:
 579                         if (ret != 0)
 580                                 {
 581                                 ret = 0;
 582                                 ctx->error = X509_V_ERR_INVALID_NON_CA;
 583                                 }
 584                         else
 585                                 ret = 1;
 586                         break;
 587                 default:
 588                         if ((ret == 0)
 589                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 590                                         && (ret != 1)))
 591                                 {
 592                                 ret = 0;
 593                                 ctx->error = X509_V_ERR_INVALID_CA;
 594                                 }
 595                         else
 596                                 ret = 1;
 597                         break;
 598                         }
 599                 if (ret == 0)
 600                         {
 601                         ctx->error_depth = i;
 602                         ctx->current_cert = x;
 603                         ok=cb(0,ctx);
 604                         if (!ok) goto end;
 605                         }
 606                 if (ctx->param->purpose > 0)
 607                         {
 608                         ret = X509_check_purpose(x, purpose, must_be_ca > 0);
 609                         if ((ret == 0)
 610                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 611                                         && (ret != 1)))
 612                                 {
 613                                 ctx->error = X509_V_ERR_INVALID_PURPOSE;
 614                                 ctx->error_depth = i;
 615                                 ctx->current_cert = x;
 616                                 ok=cb(0,ctx);
 617                                 if (!ok) goto end;
 618                                 }
 619                         }
 620                 /* Check pathlen if not self issued */
 621                 if ((i > 1) && !(x->ex_flags & EXFLAG_SI)
 622                            && (x->ex_pathlen != -1)
 623                            && (plen > (x->ex_pathlen + proxy_path_length + 1)))
 624                         {
 625                         ctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;
 626                         ctx->error_depth = i;
 627                         ctx->current_cert = x;
 628                         ok=cb(0,ctx);
 629                         if (!ok) goto end;
 630                         }
 631                 /* Increment path length if not self issued */
 632                 if (!(x->ex_flags & EXFLAG_SI))
 633                         plen++;
 634                 /* If this certificate is a proxy certificate, the next
 635                    certificate must be another proxy certificate or a EE
 636                    certificate.  If not, the next certificate must be a
 637                    CA certificate.  */
 638                 if (x->ex_flags & EXFLAG_PROXY)
 639                         {
 640                         if (x->ex_pcpathlen != -1 && i > x->ex_pcpathlen)
 641                                 {
 642                                 ctx->error =
 643                                         X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED;
 644                                 ctx->error_depth = i;
 645                                 ctx->current_cert = x;
 646                                 ok=cb(0,ctx);
 647                                 if (!ok) goto end;
 648                                 }
 649                         proxy_path_length++;
 650                         must_be_ca = 0;
 651                         }
 652                 else
 653                         must_be_ca = 1;
 654                 }
 655         ok = 1;
 656  end:
 657         return ok;
 658 #endif
 659 }
 660
 661 static int check_name_constraints(X509_STORE_CTX *ctx)
 662         {
 663         X509 *x;
 664         int i, j, rv;
 665         /* Check name constraints for all certificates */
 666         for (i = sk_X509_num(ctx->chain) - 1; i >= 0; i--)
 667                 {
 668                 x = sk_X509_value(ctx->chain, i);
 669                 /* Ignore self issued certs unless last in chain */
 670                 if (i && (x->ex_flags & EXFLAG_SI))
 671                         continue;
 672                 /* Check against constraints for all certificates higher in
 673                  * chain including trust anchor. Trust anchor not strictly
 674                  * speaking needed but if it includes constraints it is to be
 675                  * assumed it expects them to be obeyed.
 676                  */
 677                 for (j = sk_X509_num(ctx->chain) - 1; j > i; j--)
 678                         {
 679                         NAME_CONSTRAINTS *nc = sk_X509_value(ctx->chain, j)->nc;
 680                         if (nc)
 681                                 {
 682                                 rv = NAME_CONSTRAINTS_check(x, nc);
 683                                 if (rv != X509_V_OK)
 684                                         {
 685                                         ctx->error = rv;
 686                                         ctx->error_depth = i;
 687                                         ctx->current_cert = x;
 688                                         if (!ctx->verify_cb(0,ctx))
 689                                                 return 0;
 690                                         }
 691                                 }
 692                         }
 693                 }
 694         return 1;
 695         }
 696
 697 static int check_trust(X509_STORE_CTX *ctx)
 698 {
 699         int i, ok;
 700         X509 *x = NULL;
 701         int (*cb)(int xok,X509_STORE_CTX *xctx);
 702         cb=ctx->verify_cb;
 703         /* Check all trusted certificates in chain */
 704         for (i = ctx->last_untrusted; i < sk_X509_num(ctx->chain); i++)
 705                 {
 706                 x = sk_X509_value(ctx->chain, i);
 707                 ok = X509_check_trust(x, ctx->param->trust, 0);
 708                 /* If explicitly trusted return trusted */
 709                 if (ok == X509_TRUST_TRUSTED)
 710                         return X509_TRUST_TRUSTED;
 711                 /* If explicitly rejected notify callback and reject if
 712                  * not overridden.
 713                  */
 714                 if (ok == X509_TRUST_REJECTED)
 715                         {
 716                         ctx->error_depth = i;
 717                         ctx->current_cert = x;
 718                         ctx->error = X509_V_ERR_CERT_REJECTED;
 719                         ok = cb(0, ctx);
 720                         if (!ok)
 721                                 return X509_TRUST_REJECTED;
 722                         }
 723                 }
 724         /* If no trusted certs in chain at all return untrusted and
 725          * allow standard (no issuer cert) etc errors to be indicated.
 726          */
 727         return X509_TRUST_UNTRUSTED;
 728 }
 729
 730 static int check_revocation(X509_STORE_CTX *ctx)
 731         {
 732         int i, last, ok;
 733         if (!(ctx->param->flags & X509_V_FLAG_CRL_CHECK))
 734                 return 1;
 735         if (ctx->param->flags & X509_V_FLAG_CRL_CHECK_ALL)
 736                 last = sk_X509_num(ctx->chain) - 1;
 737         else
 738                 {
 739                 /* If checking CRL paths this isn't the EE certificate */
 740                 if (ctx->parent)
 741                         return 1;
 742                 last = 0;
 743                 }
 744         for(i = 0; i <= last; i++)
 745                 {
 746                 ctx->error_depth = i;
 747                 ok = check_cert(ctx);
 748                 if (!ok) return ok;
 749                 }
 750         return 1;
 751         }
 752
 753 static int check_cert(X509_STORE_CTX *ctx)
 754         {
 755         X509_CRL *crl = NULL, *dcrl = NULL;
 756         X509 *x;
 757         int ok, cnum;
 758         cnum = ctx->error_depth;
 759         x = sk_X509_value(ctx->chain, cnum);
 760         ctx->current_cert = x;
 761         ctx->current_issuer = NULL;
 762         ctx->current_crl_score = 0;
 763         ctx->current_reasons = 0;
 764         while (ctx->current_reasons != CRLDP_ALL_REASONS)
 765                 {
 766                 /* Try to retrieve relevant CRL */
 767                 if (ctx->get_crl)
 768                         ok = ctx->get_crl(ctx, &crl, x);
 769                 else
 770                         ok = get_crl_delta(ctx, &crl, &dcrl, x);
 771                 /* If error looking up CRL, nothing we can do except
 772                  * notify callback
 773                  */
 774                 if(!ok)
 775                         {
 776                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
 777                         ok = ctx->verify_cb(0, ctx);
 778                         goto err;
 779                         }
 780                 ctx->current_crl = crl;
 781                 ok = ctx->check_crl(ctx, crl);
 782                 if (!ok)
 783                         goto err;
 784
 785                 if (dcrl)
 786                         {
 787                         ok = ctx->check_crl(ctx, dcrl);
 788                         if (!ok)
 789                                 goto err;
 790                         ok = ctx->cert_crl(ctx, dcrl, x);
 791                         if (!ok)
 792                                 goto err;
 793                         }
 794                 else
 795                         ok = 1;
 796
 797                 /* Don't look in full CRL if delta reason is removefromCRL */
 798                 if (ok != 2)
 799                         {
 800                         ok = ctx->cert_crl(ctx, crl, x);
 801                         if (!ok)
 802                                 goto err;
 803                         }
 804
 805                 X509_CRL_free(crl);
 806                 X509_CRL_free(dcrl);
 807                 crl = NULL;
 808                 dcrl = NULL;
 809                 }
 810         err:
 811         X509_CRL_free(crl);
 812         X509_CRL_free(dcrl);
 813
 814         ctx->current_crl = NULL;
 815         return ok;
 816
 817         }
 818
 819 /* Check CRL times against values in X509_STORE_CTX */
 820
 821 static int check_crl_time(X509_STORE_CTX *ctx, X509_CRL *crl, int notify)
 822         {
 823         time_t *ptime;
 824         int i;
 825         if (notify)
 826                 ctx->current_crl = crl;
 827         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
 828                 ptime = &ctx->param->check_time;
 829         else
 830                 ptime = NULL;
 831
 832         i=X509_cmp_time(X509_CRL_get_lastUpdate(crl), ptime);
 833         if (i == 0)
 834                 {
 835                 if (!notify)
 836                         return 0;
 837                 ctx->error=X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD;
 838                 if (!ctx->verify_cb(0, ctx))
 839                         return 0;
 840                 }
 841
 842         if (i > 0)
 843                 {
 844                 if (!notify)
 845                         return 0;
 846                 ctx->error=X509_V_ERR_CRL_NOT_YET_VALID;
 847                 if (!ctx->verify_cb(0, ctx))
 848                         return 0;
 849                 }
 850
 851         if(X509_CRL_get_nextUpdate(crl))
 852                 {
 853                 i=X509_cmp_time(X509_CRL_get_nextUpdate(crl), ptime);
 854
 855                 if (i == 0)
 856                         {
 857                         if (!notify)
 858                                 return 0;
 859                         ctx->error=X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD;
 860                         if (!ctx->verify_cb(0, ctx))
 861                                 return 0;
 862                         }
 863                 /* Ignore expiry of base CRL is delta is valid */
 864                 if ((i < 0) && !(ctx->current_crl_score & CRL_SCORE_TIME_DELTA))
 865                         {
 866                         if (!notify)
 867                                 return 0;
 868                         ctx->error=X509_V_ERR_CRL_HAS_EXPIRED;
 869                         if (!ctx->verify_cb(0, ctx))
 870                                 return 0;
 871                         }
 872                 }
 873
 874         if (notify)
 875                 ctx->current_crl = NULL;
 876
 877         return 1;
 878         }
 879
 880 static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl,
 881                         X509 **pissuer, int *pscore, unsigned int *preasons,
 882                         STACK_OF(X509_CRL) *crls)
 883         {
 884         int i, crl_score, best_score = *pscore;
 885         unsigned int reasons, best_reasons = 0;
 886         X509 *x = ctx->current_cert;
 887         X509_CRL *crl, *best_crl = NULL;
 888         X509 *crl_issuer = NULL, *best_crl_issuer = NULL;
 889
 890         for (i = 0; i < sk_X509_CRL_num(crls); i++)
 891                 {
 892                 crl = sk_X509_CRL_value(crls, i);
 893                 reasons = *preasons;
 894                 crl_score = get_crl_score(ctx, &crl_issuer, &reasons, crl, x);
 895
 896                 if (crl_score > best_score)
 897                         {
 898                         best_crl = crl;
 899                         best_crl_issuer = crl_issuer;
 900                         best_score = crl_score;
 901                         best_reasons = reasons;
 902                         }
 903                 }
 904
 905         if (best_crl)
 906                 {
 907                 if (*pcrl)
 908                         X509_CRL_free(*pcrl);
 909                 *pcrl = best_crl;
 910                 *pissuer = best_crl_issuer;
 911                 *pscore = best_score;
 912                 *preasons = best_reasons;
 913                 CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509_CRL);
 914                 if (*pdcrl)
 915                         {
 916                         X509_CRL_free(*pdcrl);
 917                         *pdcrl = NULL;
 918                         }
 919                 get_delta_sk(ctx, pdcrl, pscore, best_crl, crls);
 920                 }
 921
 922         if (best_score >= CRL_SCORE_VALID)
 923                 return 1;
 924
 925         return 0;
 926         }
 927
 928 /* Compare two CRL extensions for delta checking purposes. They should be
 929  * both present or both absent. If both present all fields must be identical.
 930  */
 931
 932 static int crl_extension_match(X509_CRL *a, X509_CRL *b, int nid)
 933         {
 934         ASN1_OCTET_STRING *exta, *extb;
 935         int i;
 936         i = X509_CRL_get_ext_by_NID(a, nid, 0);
 937         if (i >= 0)
 938                 {
 939                 /* Can't have multiple occurrences */
 940                 if (X509_CRL_get_ext_by_NID(a, nid, i) != -1)
 941                         return 0;
 942                 exta = X509_EXTENSION_get_data(X509_CRL_get_ext(a, i));
 943                 }
 944         else
 945                 exta = NULL;
 946
 947         i = X509_CRL_get_ext_by_NID(b, nid, 0);
 948
 949         if (i >= 0)
 950                 {
 951
 952                 if (X509_CRL_get_ext_by_NID(b, nid, i) != -1)
 953                         return 0;
 954                 extb = X509_EXTENSION_get_data(X509_CRL_get_ext(b, i));
 955                 }
 956         else
 957                 extb = NULL;
 958
 959         if (!exta && !extb)
 960                 return 1;
 961
 962         if (!exta || !extb)
 963                 return 0;
 964
 965
 966         if (ASN1_OCTET_STRING_cmp(exta, extb))
 967                 return 0;
 968
 969         return 1;
 970         }
 971
 972 /* See if a base and delta are compatible */
 973
 974 static int check_delta_base(X509_CRL *delta, X509_CRL *base)
 975         {
 976         /* Delta CRL must be a delta */
 977         if (!delta->base_crl_number)
 978                         return 0;
 979         /* Base must have a CRL number */
 980         if (!base->crl_number)
 981                         return 0;
 982         /* Issuer names must match */
 983         if (X509_NAME_cmp(X509_CRL_get_issuer(base),
 984                                 X509_CRL_get_issuer(delta)))
 985                 return 0;
 986         /* AKID and IDP must match */
 987         if (!crl_extension_match(delta, base, NID_authority_key_identifier))
 988                         return 0;
 989         if (!crl_extension_match(delta, base, NID_issuing_distribution_point))
 990                         return 0;
 991         /* Delta CRL base number must not exceed Full CRL number. */
 992         if (ASN1_INTEGER_cmp(delta->base_crl_number, base->crl_number) > 0)
 993                         return 0;
 994         /* Delta CRL number must exceed full CRL number */
 995         if (ASN1_INTEGER_cmp(delta->crl_number, base->crl_number) > 0)
 996                         return 1;
 997         return 0;
 998         }
 999
1000 /* For a given base CRL find a delta... maybe extend to delta scoring
1001  * or retrieve a chain of deltas...
1002  */
1003
1004 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pscore,
1005                         X509_CRL *base, STACK_OF(X509_CRL) *crls)
1006         {
1007         X509_CRL *delta;
1008         int i;
1009         if (!(ctx->param->flags & X509_V_FLAG_USE_DELTAS))
1010                 return;
1011         if (!((ctx->current_cert->ex_flags | base->flags) & EXFLAG_FRESHEST))
1012                 return;
1013         for (i = 0; i < sk_X509_CRL_num(crls); i++)
1014                 {
1015                 delta = sk_X509_CRL_value(crls, i);
1016                 if (check_delta_base(delta, base))
1017                         {
1018                         if (check_crl_time(ctx, delta, 0))
1019                                 *pscore |= CRL_SCORE_TIME_DELTA;
1020                         CRYPTO_add(&delta->references, 1, CRYPTO_LOCK_X509_CRL);
1021                         *dcrl = delta;
1022                         return;
1023                         }
1024                 }
1025         *dcrl = NULL;
1026         }
1027
1028 /* For a given CRL return how suitable it is for the supplied certificate 'x'.
1029  * The return value is a mask of several criteria.
1030  * If the issuer is not the certificate issuer this is returned in *pissuer.
1031  * The reasons mask is also used to determine if the CRL is suitable: if
1032  * no new reasons the CRL is rejected, otherwise reasons is updated.
1033  */
1034
1035 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
1036                         unsigned int *preasons,
1037                         X509_CRL *crl, X509 *x)
1038         {
1039
1040         int crl_score = 0;
1041         unsigned int tmp_reasons = *preasons, crl_reasons;
1042
1043         /* First see if we can reject CRL straight away */
1044
1045         /* Invalid IDP cannot be processed */
1046         if (crl->idp_flags & IDP_INVALID)
1047                 return 0;
1048         /* Reason codes or indirect CRLs need extended CRL support */
1049         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1050                 {
1051                 if (crl->idp_flags & (IDP_INDIRECT | IDP_REASONS))
1052                         return 0;
1053                 }
1054         else if (crl->idp_flags & IDP_REASONS)
1055                 {
1056                 /* If no new reasons reject */
1057                 if (!(crl->idp_reasons & ~tmp_reasons))
1058                         return 0;
1059                 }
1060         /* Don't process deltas at this stage */
1061         else if (crl->base_crl_number)
1062                 return 0;
1063         /* If issuer name doesn't match certificate need indirect CRL */
1064         if (X509_NAME_cmp(X509_get_issuer_name(x), X509_CRL_get_issuer(crl)))
1065                 {
1066                 if (!(crl->idp_flags & IDP_INDIRECT))
1067                         return 0;
1068                 }
1069         else
1070                 crl_score |= CRL_SCORE_ISSUER_NAME;
1071
1072         if (!(crl->flags & EXFLAG_CRITICAL))
1073                 crl_score |= CRL_SCORE_NOCRITICAL;
1074
1075         /* Check expiry */
1076         if (check_crl_time(ctx, crl, 0))
1077                 crl_score |= CRL_SCORE_TIME;
1078
1079         /* Check authority key ID and locate certificate issuer */
1080         crl_akid_check(ctx, crl, pissuer, &crl_score);
1081
1082         /* If we can't locate certificate issuer at this point forget it */
1083
1084         if (!(crl_score & CRL_SCORE_AKID))
1085                 return 0;
1086
1087         /* Check cert for matching CRL distribution points */
1088
1089         if (crl_crldp_check(x, crl, crl_score, &crl_reasons))
1090                 {
1091                 /* If no new reasons reject */
1092                 if (!(crl_reasons & ~tmp_reasons))
1093                         return 0;
1094                 tmp_reasons |= crl_reasons;
1095                 crl_score |= CRL_SCORE_SCOPE;
1096                 }
1097
1098         *preasons = tmp_reasons;
1099
1100         return crl_score;
1101
1102         }
1103
1104 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
1105                                 X509 **pissuer, int *pcrl_score)
1106         {
1107         X509 *crl_issuer = NULL;
1108         X509_NAME *cnm = X509_CRL_get_issuer(crl);
1109         int cidx = ctx->error_depth;
1110         int i;
1111
1112         if (cidx != sk_X509_num(ctx->chain) - 1)
1113                 cidx++;
1114
1115         crl_issuer = sk_X509_value(ctx->chain, cidx);
1116
1117         if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1118                 {
1119                 if (*pcrl_score & CRL_SCORE_ISSUER_NAME)
1120                         {
1121                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_ISSUER_CERT;
1122                         *pissuer = crl_issuer;
1123                         return;
1124                         }
1125                 }
1126
1127         for (cidx++; cidx < sk_X509_num(ctx->chain); cidx++)
1128                 {
1129                 crl_issuer = sk_X509_value(ctx->chain, cidx);
1130                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1131                         continue;
1132                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1133                         {
1134                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_SAME_PATH;
1135                         *pissuer = crl_issuer;
1136                         return;
1137                         }
1138                 }
1139
1140         /* Anything else needs extended CRL support */
1141
1142         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1143                 return;
1144
1145         /* Otherwise the CRL issuer is not on the path. Look for it in the
1146          * set of untrusted certificates.
1147          */
1148         for (i = 0; i < sk_X509_num(ctx->untrusted); i++)
1149                 {
1150                 crl_issuer = sk_X509_value(ctx->untrusted, i);
1151                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1152                         continue;
1153                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1154                         {
1155                         *pissuer = crl_issuer;
1156                         *pcrl_score |= CRL_SCORE_AKID;
1157                         return;
1158                         }
1159                 }
1160         }
1161
1162 /* Check the path of a CRL issuer certificate. This creates a new
1163  * X509_STORE_CTX and populates it with most of the parameters from the
1164  * parent. This could be optimised somewhat since a lot of path checking
1165  * will be duplicated by the parent, but this will rarely be used in
1166  * practice.
1167  */
1168
1169 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x)
1170         {
1171         X509_STORE_CTX crl_ctx;
1172         int ret;
1173         /* Don't allow recursive CRL path validation */
1174         if (ctx->parent)
1175                 return 0;
1176         if (!X509_STORE_CTX_init(&crl_ctx, ctx->ctx, x, ctx->untrusted))
1177                 return -1;
1178
1179         crl_ctx.crls = ctx->crls;
1180         /* Copy verify params across */
1181         X509_STORE_CTX_set0_param(&crl_ctx, ctx->param);
1182
1183         crl_ctx.parent = ctx;
1184         crl_ctx.verify_cb = ctx->verify_cb;
1185
1186         /* Verify CRL issuer */
1187         ret = X509_verify_cert(&crl_ctx);
1188
1189         if (ret <= 0)
1190                 goto err;
1191
1192         /* Check chain is acceptable */
1193
1194         ret = check_crl_chain(ctx, ctx->chain, crl_ctx.chain);
1195         err:
1196         X509_STORE_CTX_cleanup(&crl_ctx);
1197         return ret;
1198         }
1199
1200 /* RFC3280 says nothing about the relationship between CRL path
1201  * and certificate path, which could lead to situations where a
1202  * certificate could be revoked or validated by a CA not authorised
1203  * to do so. RFC5280 is more strict and states that the two paths must
1204  * end in the same trust anchor, though some discussions remain...
1205  * until this is resolved we use the RFC5280 version
1206  */
1207
1208 static int check_crl_chain(X509_STORE_CTX *ctx,
1209                         STACK_OF(X509) *cert_path,
1210                         STACK_OF(X509) *crl_path)
1211         {
1212         X509 *cert_ta, *crl_ta;
1213         cert_ta = sk_X509_value(cert_path, sk_X509_num(cert_path) - 1);
1214         crl_ta = sk_X509_value(crl_path, sk_X509_num(crl_path) - 1);
1215         if (!X509_cmp(cert_ta, crl_ta))
1216                 return 1;
1217         return 0;
1218         }
1219
1220 /* Check for match between two dist point names: three separate cases.
1221  * 1. Both are relative names and compare X509_NAME types.
1222  * 2. One full, one relative. Compare X509_NAME to GENERAL_NAMES.
1223  * 3. Both are full names and compare two GENERAL_NAMES.
1224  * 4. One is NULL: automatic match.
1225  */
1226
1227
1228 static int idp_check_dp(DIST_POINT_NAME *a, DIST_POINT_NAME *b)
1229         {
1230         X509_NAME *nm = NULL;
1231         GENERAL_NAMES *gens = NULL;
1232         GENERAL_NAME *gena, *genb;
1233         int i, j;
1234         if (!a || !b)
1235                 return 1;
1236         if (a->type == 1)
1237                 {
1238                 if (!a->dpname)
1239                         return 0;
1240                 /* Case 1: two X509_NAME */
1241                 if (b->type == 1)
1242                         {
1243                         if (!b->dpname)
1244                                 return 0;
1245                         if (!X509_NAME_cmp(a->dpname, b->dpname))
1246                                 return 1;
1247                         else
1248                                 return 0;
1249                         }
1250                 /* Case 2: set name and GENERAL_NAMES appropriately */
1251                 nm = a->dpname;
1252                 gens = b->name.fullname;
1253                 }
1254         else if (b->type == 1)
1255                 {
1256                 if (!b->dpname)
1257                         return 0;
1258                 /* Case 2: set name and GENERAL_NAMES appropriately */
1259                 gens = a->name.fullname;
1260                 nm = b->dpname;
1261                 }
1262
1263         /* Handle case 2 with one GENERAL_NAMES and one X509_NAME */
1264         if (nm)
1265                 {
1266                 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++)
1267                         {
1268                         gena = sk_GENERAL_NAME_value(gens, i);
1269                         if (gena->type != GEN_DIRNAME)
1270                                 continue;
1271                         if (!X509_NAME_cmp(nm, gena->d.directoryName))
1272                                 return 1;
1273                         }
1274                 return 0;
1275                 }
1276
1277         /* Else case 3: two GENERAL_NAMES */
1278
1279         for (i = 0; i < sk_GENERAL_NAME_num(a->name.fullname); i++)
1280                 {
1281                 gena = sk_GENERAL_NAME_value(a->name.fullname, i);
1282                 for (j = 0; j < sk_GENERAL_NAME_num(b->name.fullname); j++)
1283                         {
1284                         genb = sk_GENERAL_NAME_value(b->name.fullname, j);
1285                         if (!GENERAL_NAME_cmp(gena, genb))
1286                                 return 1;
1287                         }
1288                 }
1289
1290         return 0;
1291
1292         }
1293
1294 static int crldp_check_crlissuer(DIST_POINT *dp, X509_CRL *crl, int crl_score)
1295         {
1296         int i;
1297         X509_NAME *nm = X509_CRL_get_issuer(crl);
1298         /* If no CRLissuer return is successful iff don't need a match */
1299         if (!dp->CRLissuer)
1300                 return !!(crl_score & CRL_SCORE_ISSUER_NAME);
1301         for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++)
1302                 {
1303                 GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
1304                 if (gen->type != GEN_DIRNAME)
1305                         continue;
1306                 if (!X509_NAME_cmp(gen->d.directoryName, nm))
1307                         return 1;
1308                 }
1309         return 0;
1310         }
1311
1312 /* Check CRLDP and IDP */
1313
1314 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
1315                                 unsigned int *preasons)
1316         {
1317         int i;
1318         if (crl->idp_flags & IDP_ONLYATTR)
1319                 return 0;
1320         if (x->ex_flags & EXFLAG_CA)
1321                 {
1322                 if (crl->idp_flags & IDP_ONLYUSER)
1323                         return 0;
1324                 }
1325         else
1326                 {
1327                 if (crl->idp_flags & IDP_ONLYCA)
1328                         return 0;
1329                 }
1330         *preasons = crl->idp_reasons;
1331         for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++)
1332                 {
1333                 DIST_POINT *dp = sk_DIST_POINT_value(x->crldp, i);
1334                 if (crldp_check_crlissuer(dp, crl, crl_score))
1335                         {
1336                         if (!crl->idp ||
1337                              idp_check_dp(dp->distpoint, crl->idp->distpoint))
1338                                 {
1339                                 *preasons &= dp->dp_reasons;
1340                                 return 1;
1341                                 }
1342                         }
1343                 }
1344         if ((!crl->idp || !crl->idp->distpoint) && (crl_score & CRL_SCORE_ISSUER_NAME))
1345                 return 1;
1346         return 0;
1347         }
1348
1349 /* Retrieve CRL corresponding to current certificate.
1350  * If deltas enabled try to find a delta CRL too
1351  */
1352
1353 static int get_crl_delta(X509_STORE_CTX *ctx,
1354                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)
1355         {
1356         int ok;
1357         X509 *issuer = NULL;
1358         int crl_score = 0;
1359         unsigned int reasons;
1360         X509_CRL *crl = NULL, *dcrl = NULL;
1361         STACK_OF(X509_CRL) *skcrl;
1362         X509_NAME *nm = X509_get_issuer_name(x);
1363         reasons = ctx->current_reasons;
1364         ok = get_crl_sk(ctx, &crl, &dcrl,
1365                                 &issuer, &crl_score, &reasons, ctx->crls);
1366
1367         if (ok)
1368                 goto done;
1369
1370         /* Lookup CRLs from store */
1371
1372         skcrl = ctx->lookup_crls(ctx, nm);
1373
1374         /* If no CRLs found and a near match from get_crl_sk use that */
1375         if (!skcrl && crl)
1376                 goto done;
1377
1378         get_crl_sk(ctx, &crl, &dcrl, &issuer, &crl_score, &reasons, skcrl);
1379
1380         sk_X509_CRL_pop_free(skcrl, X509_CRL_free);
1381
1382         done:
1383
1384         /* If we got any kind of CRL use it and return success */
1385         if (crl)
1386                 {
1387                 ctx->current_issuer = issuer;
1388                 ctx->current_crl_score = crl_score;
1389                 ctx->current_reasons = reasons;
1390                 *pcrl = crl;
1391                 *pdcrl = dcrl;
1392                 return 1;
1393                 }
1394
1395         return 0;
1396         }
1397
1398 /* Check CRL validity */
1399 static int check_crl(X509_STORE_CTX *ctx, X509_CRL *crl)
1400         {
1401         X509 *issuer = NULL;
1402         EVP_PKEY *ikey = NULL;
1403         int ok = 0, chnum, cnum;
1404         cnum = ctx->error_depth;
1405         chnum = sk_X509_num(ctx->chain) - 1;
1406         /* if we have an alternative CRL issuer cert use that */
1407         if (ctx->current_issuer)
1408                 issuer = ctx->current_issuer;
1409
1410         /* Else find CRL issuer: if not last certificate then issuer
1411          * is next certificate in chain.
1412          */
1413         else if (cnum < chnum)
1414                 issuer = sk_X509_value(ctx->chain, cnum + 1);
1415         else
1416                 {
1417                 issuer = sk_X509_value(ctx->chain, chnum);
1418                 /* If not self signed, can't check signature */
1419                 if(!ctx->check_issued(ctx, issuer, issuer))
1420                         {
1421                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER;
1422                         ok = ctx->verify_cb(0, ctx);
1423                         if(!ok) goto err;
1424                         }
1425                 }
1426
1427         if(issuer)
1428                 {
1429                 /* Skip most tests for deltas because they have already
1430                  * been done
1431                  */
1432                 if (!crl->base_crl_number)
1433                         {
1434                         /* Check for cRLSign bit if keyUsage present */
1435                         if ((issuer->ex_flags & EXFLAG_KUSAGE) &&
1436                                 !(issuer->ex_kusage & KU_CRL_SIGN))
1437                                 {
1438                                 ctx->error = X509_V_ERR_KEYUSAGE_NO_CRL_SIGN;
1439                                 ok = ctx->verify_cb(0, ctx);
1440                                 if(!ok) goto err;
1441                                 }
1442
1443                         if (!(ctx->current_crl_score & CRL_SCORE_SCOPE))
1444                                 {
1445                                 ctx->error = X509_V_ERR_DIFFERENT_CRL_SCOPE;
1446                                 ok = ctx->verify_cb(0, ctx);
1447                                 if(!ok) goto err;
1448                                 }
1449
1450                         if (!(ctx->current_crl_score & CRL_SCORE_SAME_PATH))
1451                                 {
1452                                 if (check_crl_path(ctx, ctx->current_issuer) <= 0)
1453                                         {
1454                                         ctx->error = X509_V_ERR_CRL_PATH_VALIDATION_ERROR;
1455                                         ok = ctx->verify_cb(0, ctx);
1456                                         if(!ok) goto err;
1457                                         }
1458                                 }
1459
1460                         if (crl->idp_flags & IDP_INVALID)
1461                                 {
1462                                 ctx->error = X509_V_ERR_INVALID_EXTENSION;
1463                                 ok = ctx->verify_cb(0, ctx);
1464                                 if(!ok) goto err;
1465                                 }
1466
1467
1468                         }
1469
1470                 if (!(ctx->current_crl_score & CRL_SCORE_TIME))
1471                         {
1472                         ok = check_crl_time(ctx, crl, 1);
1473                         if (!ok)
1474                                 goto err;
1475                         }
1476
1477                 /* Attempt to get issuer certificate public key */
1478                 ikey = X509_get_pubkey(issuer);
1479
1480                 if(!ikey)
1481                         {
1482                         ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1483                         ok = ctx->verify_cb(0, ctx);
1484                         if (!ok) goto err;
1485                         }
1486                 else
1487                         {
1488                         int rv;
1489                         rv = X509_CRL_check_suiteb(crl, ikey, ctx->param->flags);
1490                         if (rv != X509_V_OK)
1491                                 {
1492                                 ctx->error=rv;
1493                                 ok = ctx->verify_cb(0, ctx);
1494                                 if (!ok)
1495                                         goto err;
1496                                 }
1497                         /* Verify CRL signature */
1498                         if(X509_CRL_verify(crl, ikey) <= 0)
1499                                 {
1500                                 ctx->error=X509_V_ERR_CRL_SIGNATURE_FAILURE;
1501                                 ok = ctx->verify_cb(0, ctx);
1502                                 if (!ok) goto err;
1503                                 }
1504                         }
1505                 }
1506
1507         ok = 1;
1508
1509         err:
1510         EVP_PKEY_free(ikey);
1511         return ok;
1512         }
1513
1514 /* Check certificate against CRL */
1515 static int cert_crl(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x)
1516         {
1517         int ok;
1518         X509_REVOKED *rev;
1519         /* The rules changed for this... previously if a CRL contained
1520          * unhandled critical extensions it could still be used to indicate
1521          * a certificate was revoked. This has since been changed since
1522          * critical extension can change the meaning of CRL entries.
1523          */
1524         if (crl->flags & EXFLAG_CRITICAL)
1525                 {
1526                 if (ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
1527                         return 1;
1528                 ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION;
1529                 ok = ctx->verify_cb(0, ctx);
1530                 if(!ok)
1531                         return 0;
1532                 }
1533         /* Look for serial number of certificate in CRL
1534          * If found make sure reason is not removeFromCRL.
1535          */
1536         if (X509_CRL_get0_by_cert(crl, &rev, x))
1537                 {
1538                 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
1539                         return 2;
1540                 ctx->error = X509_V_ERR_CERT_REVOKED;
1541                 ok = ctx->verify_cb(0, ctx);
1542                 if (!ok)
1543                         return 0;
1544                 }
1545
1546         return 1;
1547         }
1548
1549 static int check_policy(X509_STORE_CTX *ctx)
1550         {
1551         int ret;
1552         if (ctx->parent)
1553                 return 1;
1554         ret = X509_policy_check(&ctx->tree, &ctx->explicit_policy, ctx->chain,
1555                                 ctx->param->policies, ctx->param->flags);
1556         if (ret == 0)
1557                 {
1558                 X509err(X509_F_CHECK_POLICY,ERR_R_MALLOC_FAILURE);
1559                 return 0;
1560                 }
1561         /* Invalid or inconsistent extensions */
1562         if (ret == -1)
1563                 {
1564                 /* Locate certificates with bad extensions and notify
1565                  * callback.
1566                  */
1567                 X509 *x;
1568                 int i;
1569                 for (i = 1; i < sk_X509_num(ctx->chain); i++)
1570                         {
1571                         x = sk_X509_value(ctx->chain, i);
1572                         if (!(x->ex_flags & EXFLAG_INVALID_POLICY))
1573                                 continue;
1574                         ctx->current_cert = x;
1575                         ctx->error = X509_V_ERR_INVALID_POLICY_EXTENSION;
1576                         if(!ctx->verify_cb(0, ctx))
1577                                 return 0;
1578                         }
1579                 return 1;
1580                 }
1581         if (ret == -2)
1582                 {
1583                 ctx->current_cert = NULL;
1584                 ctx->error = X509_V_ERR_NO_EXPLICIT_POLICY;
1585                 return ctx->verify_cb(0, ctx);
1586                 }
1587
1588         if (ctx->param->flags & X509_V_FLAG_NOTIFY_POLICY)
1589                 {
1590                 ctx->current_cert = NULL;
1591                 ctx->error = X509_V_OK;
1592                 if (!ctx->verify_cb(2, ctx))
1593                         return 0;
1594                 }
1595
1596         return 1;
1597         }
1598
1599 static int check_cert_time(X509_STORE_CTX *ctx, X509 *x)
1600         {
1601         time_t *ptime;
1602         int i;
1603
1604         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
1605                 ptime = &ctx->param->check_time;
1606         else
1607                 ptime = NULL;
1608
1609         i=X509_cmp_time(X509_get_notBefore(x), ptime);
1610         if (i == 0)
1611                 {
1612                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
1613                 ctx->current_cert=x;
1614                 if (!ctx->verify_cb(0, ctx))
1615                         return 0;
1616                 }
1617
1618         if (i > 0)
1619                 {
1620                 ctx->error=X509_V_ERR_CERT_NOT_YET_VALID;
1621                 ctx->current_cert=x;
1622                 if (!ctx->verify_cb(0, ctx))
1623                         return 0;
1624                 }
1625
1626         i=X509_cmp_time(X509_get_notAfter(x), ptime);
1627         if (i == 0)
1628                 {
1629                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
1630                 ctx->current_cert=x;
1631                 if (!ctx->verify_cb(0, ctx))
1632                         return 0;
1633                 }
1634
1635         if (i < 0)
1636                 {
1637                 ctx->error=X509_V_ERR_CERT_HAS_EXPIRED;
1638                 ctx->current_cert=x;
1639                 if (!ctx->verify_cb(0, ctx))
1640                         return 0;
1641                 }
1642
1643         return 1;
1644         }
1645
1646 static int internal_verify(X509_STORE_CTX *ctx)
1647         {
1648         int ok=0,n;
1649         X509 *xs,*xi;
1650         EVP_PKEY *pkey=NULL;
1651         int (*cb)(int xok,X509_STORE_CTX *xctx);
1652
1653         cb=ctx->verify_cb;
1654
1655         n=sk_X509_num(ctx->chain);
1656         ctx->error_depth=n-1;
1657         n--;
1658         xi=sk_X509_value(ctx->chain,n);
1659
1660         if (ctx->check_issued(ctx, xi, xi))
1661                 xs=xi;
1662         else
1663                 {
1664                 if (n <= 0)
1665                         {
1666                         ctx->error=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
1667                         ctx->current_cert=xi;
1668                         ok=cb(0,ctx);
1669                         goto end;
1670                         }
1671                 else
1672                         {
1673                         n--;
1674                         ctx->error_depth=n;
1675                         xs=sk_X509_value(ctx->chain,n);
1676                         }
1677                 }
1678
1679 /*      ctx->error=0;  not needed */
1680         while (n >= 0)
1681                 {
1682                 ctx->error_depth=n;
1683
1684                 /* Skip signature check for self signed certificates unless
1685                  * explicitly asked for. It doesn't add any security and
1686                  * just wastes time.
1687                  */
1688                 if (!xs->valid && (xs != xi || (ctx->param->flags & X509_V_FLAG_CHECK_SS_SIGNATURE)))
1689                         {
1690                         if ((pkey=X509_get_pubkey(xi)) == NULL)
1691                                 {
1692                                 ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1693                                 ctx->current_cert=xi;
1694                                 ok=(*cb)(0,ctx);
1695                                 if (!ok) goto end;
1696                                 }
1697                         else if (X509_verify(xs,pkey) <= 0)
1698                                 {
1699                                 ctx->error=X509_V_ERR_CERT_SIGNATURE_FAILURE;
1700                                 ctx->current_cert=xs;
1701                                 ok=(*cb)(0,ctx);
1702                                 if (!ok)
1703                                         {
1704                                         EVP_PKEY_free(pkey);
1705                                         goto end;
1706                                         }
1707                                 }
1708                         EVP_PKEY_free(pkey);
1709                         pkey=NULL;
1710                         }
1711
1712                 xs->valid = 1;
1713
1714                 ok = check_cert_time(ctx, xs);
1715                 if (!ok)
1716                         goto end;
1717
1718                 /* The last error (if any) is still in the error value */
1719                 ctx->current_issuer=xi;
1720                 ctx->current_cert=xs;
1721                 ok=(*cb)(1,ctx);
1722                 if (!ok) goto end;
1723
1724                 n--;
1725                 if (n >= 0)
1726                         {
1727                         xi=xs;
1728                         xs=sk_X509_value(ctx->chain,n);
1729                         }
1730                 }
1731         ok=1;
1732 end:
1733         return ok;
1734         }
1735
1736 int X509_cmp_current_time(const ASN1_TIME *ctm)
1737 {
1738         return X509_cmp_time(ctm, NULL);
1739 }
1740
1741 int X509_cmp_time(const ASN1_TIME *ctm, time_t *cmp_time)
1742         {
1743         char *str;
1744         ASN1_TIME atm;
1745         long offset;
1746         char buff1[24],buff2[24],*p;
1747         int i,j;
1748
1749         p=buff1;
1750         i=ctm->length;
1751         str=(char *)ctm->data;
1752         if (ctm->type == V_ASN1_UTCTIME)
1753                 {
1754                 if ((i < 11) || (i > 17)) return 0;
1755                 memcpy(p,str,10);
1756                 p+=10;
1757                 str+=10;
1758                 }
1759         else
1760                 {
1761                 if (i < 13) return 0;
1762                 memcpy(p,str,12);
1763                 p+=12;
1764                 str+=12;
1765                 }
1766
1767         if ((*str == 'Z') || (*str == '-') || (*str == '+'))
1768                 { *(p++)='0'; *(p++)='0'; }
1769         else
1770                 {
1771                 *(p++)= *(str++);
1772                 *(p++)= *(str++);
1773                 /* Skip any fractional seconds... */
1774                 if (*str == '.')
1775                         {
1776                         str++;
1777                         while ((*str >= '0') && (*str <= '9')) str++;
1778                         }
1779
1780                 }
1781         *(p++)='Z';
1782         *(p++)='\0';
1783
1784         if (*str == 'Z')
1785                 offset=0;
1786         else
1787                 {
1788                 if ((*str != '+') && (*str != '-'))
1789                         return 0;
1790                 offset=((str[1]-'0')*10+(str[2]-'0'))*60;
1791                 offset+=(str[3]-'0')*10+(str[4]-'0');
1792                 if (*str == '-')
1793                         offset= -offset;
1794                 }
1795         atm.type=ctm->type;
1796         atm.flags = 0;
1797         atm.length=sizeof(buff2);
1798         atm.data=(unsigned char *)buff2;
1799
1800         if (X509_time_adj(&atm, offset*60, cmp_time) == NULL)
1801                 return 0;
1802
1803         if (ctm->type == V_ASN1_UTCTIME)
1804                 {
1805                 i=(buff1[0]-'0')*10+(buff1[1]-'0');
1806                 if (i < 50) i+=100; /* cf. RFC 2459 */
1807                 j=(buff2[0]-'0')*10+(buff2[1]-'0');
1808                 if (j < 50) j+=100;
1809
1810                 if (i < j) return -1;
1811                 if (i > j) return 1;
1812                 }
1813         i=strcmp(buff1,buff2);
1814         if (i == 0) /* wait a second then return younger :-) */
1815                 return -1;
1816         else
1817                 return i;
1818         }
1819
1820 ASN1_TIME *X509_gmtime_adj(ASN1_TIME *s, long adj)
1821 {
1822         return X509_time_adj(s, adj, NULL);
1823 }
1824
1825 ASN1_TIME *X509_time_adj(ASN1_TIME *s, long offset_sec, time_t *in_tm)
1826         {
1827         return X509_time_adj_ex(s, 0, offset_sec, in_tm);
1828         }
1829
1830 ASN1_TIME *X509_time_adj_ex(ASN1_TIME *s,
1831                                 int offset_day, long offset_sec, time_t *in_tm)
1832         {
1833         time_t t;
1834
1835         if (in_tm) t = *in_tm;
1836         else time(&t);
1837
1838         if (s && !(s->flags & ASN1_STRING_FLAG_MSTRING))
1839                 {
1840                 if (s->type == V_ASN1_UTCTIME)
1841                         return ASN1_UTCTIME_adj(s,t, offset_day, offset_sec);
1842                 if (s->type == V_ASN1_GENERALIZEDTIME)
1843                         return ASN1_GENERALIZEDTIME_adj(s, t, offset_day,
1844                                                                 offset_sec);
1845                 }
1846         return ASN1_TIME_adj(s, t, offset_day, offset_sec);
1847         }
1848
1849 int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain)
1850         {
1851         EVP_PKEY *ktmp=NULL,*ktmp2;
1852         int i,j;
1853
1854         if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) return 1;
1855
1856         for (i=0; i<sk_X509_num(chain); i++)
1857                 {
1858                 ktmp=X509_get_pubkey(sk_X509_value(chain,i));
1859                 if (ktmp == NULL)
1860                         {
1861                         X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
1862                         return 0;
1863                         }
1864                 if (!EVP_PKEY_missing_parameters(ktmp))
1865                         break;
1866                 else
1867                         {
1868                         EVP_PKEY_free(ktmp);
1869                         ktmp=NULL;
1870                         }
1871                 }
1872         if (ktmp == NULL)
1873                 {
1874                 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
1875                 return 0;
1876                 }
1877
1878         /* first, populate the other certs */
1879         for (j=i-1; j >= 0; j--)
1880                 {
1881                 ktmp2=X509_get_pubkey(sk_X509_value(chain,j));
1882                 EVP_PKEY_copy_parameters(ktmp2,ktmp);
1883                 EVP_PKEY_free(ktmp2);
1884                 }
1885
1886         if (pkey != NULL) EVP_PKEY_copy_parameters(pkey,ktmp);
1887         EVP_PKEY_free(ktmp);
1888         return 1;
1889         }
1890
1891 int X509_STORE_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
1892              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
1893         {
1894         /* This function is (usually) called only once, by
1895          * SSL_get_ex_data_X509_STORE_CTX_idx (ssl/ssl_cert.c). */
1896         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_X509_STORE_CTX, argl, argp,
1897                         new_func, dup_func, free_func);
1898         }
1899
1900 int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data)
1901         {
1902         return CRYPTO_set_ex_data(&ctx->ex_data,idx,data);
1903         }
1904
1905 void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx)
1906         {
1907         return CRYPTO_get_ex_data(&ctx->ex_data,idx);
1908         }
1909
1910 int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx)
1911         {
1912         return ctx->error;
1913         }
1914
1915 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err)
1916         {
1917         ctx->error=err;
1918         }
1919
1920 int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx)
1921         {
1922         return ctx->error_depth;
1923         }
1924
1925 X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx)
1926         {
1927         return ctx->current_cert;
1928         }
1929
1930 STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx)
1931         {
1932         return ctx->chain;
1933         }
1934
1935 STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx)
1936         {
1937         if (!ctx->chain)
1938                 return NULL;
1939         return X509_chain_up_ref(ctx->chain);
1940         }
1941
1942 X509 *X509_STORE_CTX_get0_current_issuer(X509_STORE_CTX *ctx)
1943         {
1944         return ctx->current_issuer;
1945         }
1946
1947 X509_CRL *X509_STORE_CTX_get0_current_crl(X509_STORE_CTX *ctx)
1948         {
1949         return ctx->current_crl;
1950         }
1951
1952 X509_STORE_CTX *X509_STORE_CTX_get0_parent_ctx(X509_STORE_CTX *ctx)
1953         {
1954         return ctx->parent;
1955         }
1956
1957 void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x)
1958         {
1959         ctx->cert=x;
1960         }
1961
1962 void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
1963         {
1964         ctx->untrusted=sk;
1965         }
1966
1967 void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk)
1968         {
1969         ctx->crls=sk;
1970         }
1971
1972 int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose)
1973         {
1974         return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0);
1975         }
1976
1977 int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust)
1978         {
1979         return X509_STORE_CTX_purpose_inherit(ctx, 0, 0, trust);
1980         }
1981
1982 /* This function is used to set the X509_STORE_CTX purpose and trust
1983  * values. This is intended to be used when another structure has its
1984  * own trust and purpose values which (if set) will be inherited by
1985  * the ctx. If they aren't set then we will usually have a default
1986  * purpose in mind which should then be used to set the trust value.
1987  * An example of this is SSL use: an SSL structure will have its own
1988  * purpose and trust settings which the application can set: if they
1989  * aren't set then we use the default of SSL client/server.
1990  */
1991
1992 int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
1993                                 int purpose, int trust)
1994 {
1995         int idx;
1996         /* If purpose not set use default */
1997         if (!purpose) purpose = def_purpose;
1998         /* If we have a purpose then check it is valid */
1999         if (purpose)
2000                 {
2001                 X509_PURPOSE *ptmp;
2002                 idx = X509_PURPOSE_get_by_id(purpose);
2003                 if (idx == -1)
2004                         {
2005                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2006                                                 X509_R_UNKNOWN_PURPOSE_ID);
2007                         return 0;
2008                         }
2009                 ptmp = X509_PURPOSE_get0(idx);
2010                 if (ptmp->trust == X509_TRUST_DEFAULT)
2011                         {
2012                         idx = X509_PURPOSE_get_by_id(def_purpose);
2013                         if (idx == -1)
2014                                 {
2015                                 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2016                                                 X509_R_UNKNOWN_PURPOSE_ID);
2017                                 return 0;
2018                                 }
2019                         ptmp = X509_PURPOSE_get0(idx);
2020                         }
2021                 /* If trust not set then get from purpose default */
2022                 if (!trust) trust = ptmp->trust;
2023                 }
2024         if (trust)
2025                 {
2026                 idx = X509_TRUST_get_by_id(trust);
2027                 if (idx == -1)
2028                         {
2029                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2030                                                 X509_R_UNKNOWN_TRUST_ID);
2031                         return 0;
2032                         }
2033                 }
2034
2035         if (purpose && !ctx->param->purpose) ctx->param->purpose = purpose;
2036         if (trust && !ctx->param->trust) ctx->param->trust = trust;
2037         return 1;
2038 }
2039
2040 X509_STORE_CTX *X509_STORE_CTX_new(void)
2041 {
2042         X509_STORE_CTX *ctx;
2043         ctx = (X509_STORE_CTX *)OPENSSL_malloc(sizeof(X509_STORE_CTX));
2044         if (!ctx)
2045                 {
2046                 X509err(X509_F_X509_STORE_CTX_NEW,ERR_R_MALLOC_FAILURE);
2047                 return NULL;
2048                 }
2049         memset(ctx, 0, sizeof(X509_STORE_CTX));
2050         return ctx;
2051 }
2052
2053 void X509_STORE_CTX_free(X509_STORE_CTX *ctx)
2054 {
2055         X509_STORE_CTX_cleanup(ctx);
2056         OPENSSL_free(ctx);
2057 }
2058
2059 int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store, X509 *x509,
2060              STACK_OF(X509) *chain)
2061         {
2062         int ret = 1;
2063         ctx->ctx=store;
2064         ctx->current_method=0;
2065         ctx->cert=x509;
2066         ctx->untrusted=chain;
2067         ctx->crls = NULL;
2068         ctx->last_untrusted=0;
2069         ctx->other_ctx=NULL;
2070         ctx->valid=0;
2071         ctx->chain=NULL;
2072         ctx->error=0;
2073         ctx->explicit_policy=0;
2074         ctx->error_depth=0;
2075         ctx->current_cert=NULL;
2076         ctx->current_issuer=NULL;
2077         ctx->current_crl=NULL;
2078         ctx->current_crl_score=0;
2079         ctx->current_reasons=0;
2080         ctx->tree = NULL;
2081         ctx->parent = NULL;
2082
2083         ctx->param = X509_VERIFY_PARAM_new();
2084
2085         if (!ctx->param)
2086                 {
2087                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2088                 return 0;
2089                 }
2090
2091         /* Inherit callbacks and flags from X509_STORE if not set
2092          * use defaults.
2093          */
2094
2095
2096         if (store)
2097                 ret = X509_VERIFY_PARAM_inherit(ctx->param, store->param);
2098         else
2099                 ctx->param->inh_flags |= X509_VP_FLAG_DEFAULT|X509_VP_FLAG_ONCE;
2100
2101         if (store)
2102                 {
2103                 ctx->verify_cb = store->verify_cb;
2104                 ctx->cleanup = store->cleanup;
2105                 }
2106         else
2107                 ctx->cleanup = 0;
2108
2109         if (ret)
2110                 ret = X509_VERIFY_PARAM_inherit(ctx->param,
2111                                         X509_VERIFY_PARAM_lookup("default"));
2112
2113         if (ret == 0)
2114                 {
2115                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2116                 return 0;
2117                 }
2118
2119         if (store && store->check_issued)
2120                 ctx->check_issued = store->check_issued;
2121         else
2122                 ctx->check_issued = check_issued;
2123
2124         if (store && store->get_issuer)
2125                 ctx->get_issuer = store->get_issuer;
2126         else
2127                 ctx->get_issuer = X509_STORE_CTX_get1_issuer;
2128
2129         if (store && store->verify_cb)
2130                 ctx->verify_cb = store->verify_cb;
2131         else
2132                 ctx->verify_cb = null_callback;
2133
2134         if (store && store->verify)
2135                 ctx->verify = store->verify;
2136         else
2137                 ctx->verify = internal_verify;
2138
2139         if (store && store->check_revocation)
2140                 ctx->check_revocation = store->check_revocation;
2141         else
2142                 ctx->check_revocation = check_revocation;
2143
2144         if (store && store->get_crl)
2145                 ctx->get_crl = store->get_crl;
2146         else
2147                 ctx->get_crl = NULL;
2148
2149         if (store && store->check_crl)
2150                 ctx->check_crl = store->check_crl;
2151         else
2152                 ctx->check_crl = check_crl;
2153
2154         if (store && store->cert_crl)
2155                 ctx->cert_crl = store->cert_crl;
2156         else
2157                 ctx->cert_crl = cert_crl;
2158
2159         if (store && store->lookup_certs)
2160                 ctx->lookup_certs = store->lookup_certs;
2161         else
2162                 ctx->lookup_certs = X509_STORE_get1_certs;
2163
2164         if (store && store->lookup_crls)
2165                 ctx->lookup_crls = store->lookup_crls;
2166         else
2167                 ctx->lookup_crls = X509_STORE_get1_crls;
2168
2169         ctx->check_policy = check_policy;
2170
2171
2172         /* This memset() can't make any sense anyway, so it's removed. As
2173          * X509_STORE_CTX_cleanup does a proper "free" on the ex_data, we put a
2174          * corresponding "new" here and remove this bogus initialisation. */
2175         /* memset(&(ctx->ex_data),0,sizeof(CRYPTO_EX_DATA)); */
2176         if(!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx,
2177                                 &(ctx->ex_data)))
2178                 {
2179                 OPENSSL_free(ctx);
2180                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2181                 return 0;
2182                 }
2183         return 1;
2184         }
2185
2186 /* Set alternative lookup method: just a STACK of trusted certificates.
2187  * This avoids X509_STORE nastiness where it isn't needed.
2188  */
2189
2190 void X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2191 {
2192         ctx->other_ctx = sk;
2193         ctx->get_issuer = get_issuer_sk;
2194 }
2195
2196 void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx)
2197         {
2198         if (ctx->cleanup) ctx->cleanup(ctx);
2199         if (ctx->param != NULL)
2200                 {
2201                 if (ctx->parent == NULL)
2202                         X509_VERIFY_PARAM_free(ctx->param);
2203                 ctx->param=NULL;
2204                 }
2205         if (ctx->tree != NULL)
2206                 {
2207                 X509_policy_tree_free(ctx->tree);
2208                 ctx->tree=NULL;
2209                 }
2210         if (ctx->chain != NULL)
2211                 {
2212                 sk_X509_pop_free(ctx->chain,X509_free);
2213                 ctx->chain=NULL;
2214                 }
2215         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, &(ctx->ex_data));
2216         memset(&ctx->ex_data,0,sizeof(CRYPTO_EX_DATA));
2217         }
2218
2219 void X509_STORE_CTX_set_depth(X509_STORE_CTX *ctx, int depth)
2220         {
2221         X509_VERIFY_PARAM_set_depth(ctx->param, depth);
2222         }
2223
2224 void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, unsigned long flags)
2225         {
2226         X509_VERIFY_PARAM_set_flags(ctx->param, flags);
2227         }
2228
2229 void X509_STORE_CTX_set_time(X509_STORE_CTX *ctx, unsigned long flags, time_t t)
2230         {
2231         X509_VERIFY_PARAM_set_time(ctx->param, t);
2232         }
2233
2234 void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx,
2235                                   int (*verify_cb)(int, X509_STORE_CTX *))
2236         {
2237         ctx->verify_cb=verify_cb;
2238         }
2239
2240 X509_POLICY_TREE *X509_STORE_CTX_get0_policy_tree(X509_STORE_CTX *ctx)
2241         {
2242         return ctx->tree;
2243         }
2244
2245 int X509_STORE_CTX_get_explicit_policy(X509_STORE_CTX *ctx)
2246         {
2247         return ctx->explicit_policy;
2248         }
2249
2250 int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name)
2251         {
2252         const X509_VERIFY_PARAM *param;
2253         param = X509_VERIFY_PARAM_lookup(name);
2254         if (!param)
2255                 return 0;
2256         return X509_VERIFY_PARAM_inherit(ctx->param, param);
2257         }
2258
2259 X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx)
2260         {
2261         return ctx->param;
2262         }
2263
2264 void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param)
2265         {
2266         if (ctx->param)
2267                 X509_VERIFY_PARAM_free(ctx->param);
2268         ctx->param = param;
2269         }
2270
2271 IMPLEMENT_STACK_OF(X509)
2272 IMPLEMENT_ASN1_SET_OF(X509)
2273
2274 IMPLEMENT_STACK_OF(X509_NAME)
2275
2276 IMPLEMENT_STACK_OF(X509_ATTRIBUTE)
2277 IMPLEMENT_ASN1_SET_OF(X509_ATTRIBUTE)