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 #include "vpm_int.h"
  73
  74 /* CRL score values */
  75
  76 /* No unhandled critical extensions */
  77
  78 #define CRL_SCORE_NOCRITICAL    0x100
  79
  80 /* certificate is within CRL scope */
  81
  82 #define CRL_SCORE_SCOPE         0x080
  83
  84 /* CRL times valid */
  85
  86 #define CRL_SCORE_TIME          0x040
  87
  88 /* Issuer name matches certificate */
  89
  90 #define CRL_SCORE_ISSUER_NAME   0x020
  91
  92 /* If this score or above CRL is probably valid */
  93
  94 #define CRL_SCORE_VALID (CRL_SCORE_NOCRITICAL|CRL_SCORE_TIME|CRL_SCORE_SCOPE)
  95
  96 /* CRL issuer is certificate issuer */
  97
  98 #define CRL_SCORE_ISSUER_CERT   0x018
  99
 100 /* CRL issuer is on certificate path */
 101
 102 #define CRL_SCORE_SAME_PATH     0x008
 103
 104 /* CRL issuer matches CRL AKID */
 105
 106 #define CRL_SCORE_AKID          0x004
 107
 108 /* Have a delta CRL with valid times */
 109
 110 #define CRL_SCORE_TIME_DELTA    0x002
 111
 112 static int null_callback(int ok,X509_STORE_CTX *e);
 113 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer);
 114 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x);
 115 static int check_chain_extensions(X509_STORE_CTX *ctx);
 116 static int check_name_constraints(X509_STORE_CTX *ctx);
 117 static int check_id(X509_STORE_CTX *ctx);
 118 static int check_trust(X509_STORE_CTX *ctx);
 119 static int check_revocation(X509_STORE_CTX *ctx);
 120 static int check_cert(X509_STORE_CTX *ctx);
 121 static int check_policy(X509_STORE_CTX *ctx);
 122
 123 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
 124                         unsigned int *preasons,
 125                         X509_CRL *crl, X509 *x);
 126 static int get_crl_delta(X509_STORE_CTX *ctx,
 127                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x);
 128 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pcrl_score,
 129                         X509_CRL *base, STACK_OF(X509_CRL) *crls);
 130 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
 131                                 X509 **pissuer, int *pcrl_score);
 132 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
 133                                 unsigned int *preasons);
 134 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x);
 135 static int check_crl_chain(X509_STORE_CTX *ctx,
 136                         STACK_OF(X509) *cert_path,
 137                         STACK_OF(X509) *crl_path);
 138
 139 static int internal_verify(X509_STORE_CTX *ctx);
 140 const char X509_version[]="X.509" OPENSSL_VERSION_PTEXT;
 141
 142
 143 static int null_callback(int ok, X509_STORE_CTX *e)
 144         {
 145         return ok;
 146         }
 147
 148 #if 0
 149 static int x509_subject_cmp(X509 **a, X509 **b)
 150         {
 151         return X509_subject_name_cmp(*a,*b);
 152         }
 153 #endif
 154 /* Return 1 is a certificate is self signed */
 155 static int cert_self_signed(X509 *x)
 156         {
 157         X509_check_purpose(x, -1, 0);
 158         if (x->ex_flags & EXFLAG_SS)
 159                 return 1;
 160         else
 161                 return 0;
 162         }
 163
 164 /* Given a certificate try and find an exact match in the store */
 165
 166 static X509 *lookup_cert_match(X509_STORE_CTX *ctx, X509 *x)
 167         {
 168         STACK_OF(X509) *certs;
 169         X509 *xtmp = NULL;
 170         int i;
 171         /* Lookup all certs with matching subject name */
 172         certs = ctx->lookup_certs(ctx, X509_get_subject_name(x));
 173         if (certs == NULL)
 174                 return NULL;
 175         /* Look for exact match */
 176         for (i = 0; i < sk_X509_num(certs); i++)
 177                 {
 178                 xtmp = sk_X509_value(certs, i);
 179                 if (!X509_cmp(xtmp, x))
 180                         break;
 181                 }
 182         if (i < sk_X509_num(certs))
 183                 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
 184         else
 185                 xtmp = NULL;
 186         sk_X509_pop_free(certs, X509_free);
 187         return xtmp;
 188         }
 189
 190 int X509_verify_cert(X509_STORE_CTX *ctx)
 191         {
 192         X509 *x,*xtmp,*chain_ss=NULL;
 193         int bad_chain = 0;
 194         X509_VERIFY_PARAM *param = ctx->param;
 195         int depth,i,ok=0;
 196         int num;
 197         int (*cb)(int xok,X509_STORE_CTX *xctx);
 198         STACK_OF(X509) *sktmp=NULL;
 199         if (ctx->cert == NULL)
 200                 {
 201                 X509err(X509_F_X509_VERIFY_CERT,X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
 202                 return -1;
 203                 }
 204
 205         cb=ctx->verify_cb;
 206
 207         /* first we make sure the chain we are going to build is
 208          * present and that the first entry is in place */
 209         if (ctx->chain == NULL)
 210                 {
 211                 if (    ((ctx->chain=sk_X509_new_null()) == NULL) ||
 212                         (!sk_X509_push(ctx->chain,ctx->cert)))
 213                         {
 214                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 215                         goto end;
 216                         }
 217                 CRYPTO_add(&ctx->cert->references,1,CRYPTO_LOCK_X509);
 218                 ctx->last_untrusted=1;
 219                 }
 220
 221         /* We use a temporary STACK so we can chop and hack at it */
 222         if (ctx->untrusted != NULL
 223             && (sktmp=sk_X509_dup(ctx->untrusted)) == NULL)
 224                 {
 225                 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 226                 goto end;
 227                 }
 228
 229         num=sk_X509_num(ctx->chain);
 230         x=sk_X509_value(ctx->chain,num-1);
 231         depth=param->depth;
 232
 233
 234         for (;;)
 235                 {
 236                 /* If we have enough, we break */
 237                 if (depth < num) break; /* FIXME: If this happens, we should take
 238                                          * note of it and, if appropriate, use the
 239                                          * X509_V_ERR_CERT_CHAIN_TOO_LONG error
 240                                          * code later.
 241                                          */
 242
 243                 /* If we are self signed, we break */
 244                 if (cert_self_signed(x))
 245                         break;
 246                 /* If asked see if we can find issuer in trusted store first */
 247                 if (ctx->param->flags & X509_V_FLAG_TRUSTED_FIRST)
 248                         {
 249                         ok = ctx->get_issuer(&xtmp, ctx, x);
 250                         if (ok < 0)
 251                                 return ok;
 252                         /* If successful for now free up cert so it
 253                          * will be picked up again later.
 254                          */
 255                         if (ok > 0)
 256                                 {
 257                                 X509_free(xtmp);
 258                                 break;
 259                                 }
 260                         }
 261
 262                 /* If we were passed a cert chain, use it first */
 263                 if (ctx->untrusted != NULL)
 264                         {
 265                         xtmp=find_issuer(ctx, sktmp,x);
 266                         if (xtmp != NULL)
 267                                 {
 268                                 if (!sk_X509_push(ctx->chain,xtmp))
 269                                         {
 270                                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 271                                         goto end;
 272                                         }
 273                                 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
 274                                 (void)sk_X509_delete_ptr(sktmp,xtmp);
 275                                 ctx->last_untrusted++;
 276                                 x=xtmp;
 277                                 num++;
 278                                 /* reparse the full chain for
 279                                  * the next one */
 280                                 continue;
 281                                 }
 282                         }
 283                 break;
 284                 }
 285
 286         /* at this point, chain should contain a list of untrusted
 287          * certificates.  We now need to add at least one trusted one,
 288          * if possible, otherwise we complain. */
 289
 290         /* Examine last certificate in chain and see if it
 291          * is self signed.
 292          */
 293
 294         i=sk_X509_num(ctx->chain);
 295         x=sk_X509_value(ctx->chain,i-1);
 296         if (cert_self_signed(x))
 297                 {
 298                 /* we have a self signed certificate */
 299                 if (sk_X509_num(ctx->chain) == 1)
 300                         {
 301                         /* We have a single self signed certificate: see if
 302                          * we can find it in the store. We must have an exact
 303                          * match to avoid possible impersonation.
 304                          */
 305                         ok = ctx->get_issuer(&xtmp, ctx, x);
 306                         if ((ok <= 0) || X509_cmp(x, xtmp))
 307                                 {
 308                                 ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
 309                                 ctx->current_cert=x;
 310                                 ctx->error_depth=i-1;
 311                                 if (ok == 1) X509_free(xtmp);
 312                                 bad_chain = 1;
 313                                 ok=cb(0,ctx);
 314                                 if (!ok) goto end;
 315                                 }
 316                         else
 317                                 {
 318                                 /* We have a match: replace certificate with store version
 319                                  * so we get any trust settings.
 320                                  */
 321                                 X509_free(x);
 322                                 x = xtmp;
 323                                 (void)sk_X509_set(ctx->chain, i - 1, x);
 324                                 ctx->last_untrusted=0;
 325                                 }
 326                         }
 327                 else
 328                         {
 329                         /* extract and save self signed certificate for later use */
 330                         chain_ss=sk_X509_pop(ctx->chain);
 331                         ctx->last_untrusted--;
 332                         num--;
 333                         x=sk_X509_value(ctx->chain,num-1);
 334                         }
 335                 }
 336
 337         /* We now lookup certs from the certificate store */
 338         for (;;)
 339                 {
 340                 /* If we have enough, we break */
 341                 if (depth < num) break;
 342
 343                 /* If we are self signed, we break */
 344                 if (cert_self_signed(x))
 345                         break;
 346
 347                 ok = ctx->get_issuer(&xtmp, ctx, x);
 348
 349                 if (ok < 0) return ok;
 350                 if (ok == 0) break;
 351
 352                 x = xtmp;
 353                 if (!sk_X509_push(ctx->chain,x))
 354                         {
 355                         X509_free(xtmp);
 356                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 357                         return 0;
 358                         }
 359                 num++;
 360                 }
 361
 362         /* we now have our chain, lets check it... */
 363
 364         i = check_trust(ctx);
 365
 366         /* If explicitly rejected error */
 367         if (i == X509_TRUST_REJECTED)
 368                 goto end;
 369         /* If not explicitly trusted then indicate error unless it's
 370          * a single self signed certificate in which case we've indicated
 371          * an error already and set bad_chain == 1
 372          */
 373         if (i != X509_TRUST_TRUSTED && !bad_chain)
 374                 {
 375                 if ((chain_ss == NULL) || !ctx->check_issued(ctx, x, chain_ss))
 376                         {
 377                         if (ctx->last_untrusted >= num)
 378                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
 379                         else
 380                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
 381                         ctx->current_cert=x;
 382                         }
 383                 else
 384                         {
 385
 386                         sk_X509_push(ctx->chain,chain_ss);
 387                         num++;
 388                         ctx->last_untrusted=num;
 389                         ctx->current_cert=chain_ss;
 390                         ctx->error=X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
 391                         chain_ss=NULL;
 392                         }
 393
 394                 ctx->error_depth=num-1;
 395                 bad_chain = 1;
 396                 ok=cb(0,ctx);
 397                 if (!ok) goto end;
 398                 }
 399
 400         /* We have the chain complete: now we need to check its purpose */
 401         ok = check_chain_extensions(ctx);
 402
 403         if (!ok) goto end;
 404
 405         /* Check name constraints */
 406
 407         ok = check_name_constraints(ctx);
 408
 409         if (!ok) goto end;
 410
 411         ok = check_id(ctx);
 412
 413         if (!ok) goto end;
 414
 415         /* We may as well copy down any DSA parameters that are required */
 416         X509_get_pubkey_parameters(NULL,ctx->chain);
 417
 418         /* Check revocation status: we do this after copying parameters
 419          * because they may be needed for CRL signature verification.
 420          */
 421
 422         ok = ctx->check_revocation(ctx);
 423         if(!ok) goto end;
 424
 425         i = X509_chain_check_suiteb(&ctx->error_depth, NULL, ctx->chain,
 426                                                         ctx->param->flags);
 427         if (i != X509_V_OK)
 428                 {
 429                 ctx->error = i;
 430                 ctx->current_cert = sk_X509_value(ctx->chain, ctx->error_depth);
 431                 ok = cb(0, ctx);
 432                 if (!ok)
 433                         goto end;
 434                 }
 435
 436         /* At this point, we have a chain and need to verify it */
 437         if (ctx->verify != NULL)
 438                 ok=ctx->verify(ctx);
 439         else
 440                 ok=internal_verify(ctx);
 441         if(!ok) goto end;
 442
 443 #ifndef OPENSSL_NO_RFC3779
 444         /* RFC 3779 path validation, now that CRL check has been done */
 445         ok = v3_asid_validate_path(ctx);
 446         if (!ok) goto end;
 447         ok = v3_addr_validate_path(ctx);
 448         if (!ok) goto end;
 449 #endif
 450
 451         /* If we get this far evaluate policies */
 452         if (!bad_chain && (ctx->param->flags & X509_V_FLAG_POLICY_CHECK))
 453                 ok = ctx->check_policy(ctx);
 454         if(!ok) goto end;
 455         if (0)
 456                 {
 457 end:
 458                 X509_get_pubkey_parameters(NULL,ctx->chain);
 459                 }
 460         if (sktmp != NULL) sk_X509_free(sktmp);
 461         if (chain_ss != NULL) X509_free(chain_ss);
 462         return ok;
 463         }
 464
 465
 466 /* Given a STACK_OF(X509) find the issuer of cert (if any)
 467  */
 468
 469 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x)
 470 {
 471         int i;
 472         X509 *issuer;
 473         for (i = 0; i < sk_X509_num(sk); i++)
 474                 {
 475                 issuer = sk_X509_value(sk, i);
 476                 if (ctx->check_issued(ctx, x, issuer))
 477                         return issuer;
 478                 }
 479         return NULL;
 480 }
 481
 482 /* Given a possible certificate and issuer check them */
 483
 484 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer)
 485 {
 486         int ret;
 487         ret = X509_check_issued(issuer, x);
 488         if (ret == X509_V_OK)
 489                 return 1;
 490         /* If we haven't asked for issuer errors don't set ctx */
 491         if (!(ctx->param->flags & X509_V_FLAG_CB_ISSUER_CHECK))
 492                 return 0;
 493
 494         ctx->error = ret;
 495         ctx->current_cert = x;
 496         ctx->current_issuer = issuer;
 497         return ctx->verify_cb(0, ctx);
 498         return 0;
 499 }
 500
 501 /* Alternative lookup method: look from a STACK stored in other_ctx */
 502
 503 static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
 504 {
 505         *issuer = find_issuer(ctx, ctx->other_ctx, x);
 506         if (*issuer)
 507                 {
 508                 CRYPTO_add(&(*issuer)->references,1,CRYPTO_LOCK_X509);
 509                 return 1;
 510                 }
 511         else
 512                 return 0;
 513 }
 514
 515
 516 /* Check a certificate chains extensions for consistency
 517  * with the supplied purpose
 518  */
 519
 520 static int check_chain_extensions(X509_STORE_CTX *ctx)
 521 {
 522 #ifdef OPENSSL_NO_CHAIN_VERIFY
 523         return 1;
 524 #else
 525         int i, ok=0, must_be_ca, plen = 0;
 526         X509 *x;
 527         int (*cb)(int xok,X509_STORE_CTX *xctx);
 528         int proxy_path_length = 0;
 529         int purpose;
 530         int allow_proxy_certs;
 531         cb=ctx->verify_cb;
 532
 533         /* must_be_ca can have 1 of 3 values:
 534            -1: we accept both CA and non-CA certificates, to allow direct
 535                use of self-signed certificates (which are marked as CA).
 536            0:  we only accept non-CA certificates.  This is currently not
 537                used, but the possibility is present for future extensions.
 538            1:  we only accept CA certificates.  This is currently used for
 539                all certificates in the chain except the leaf certificate.
 540         */
 541         must_be_ca = -1;
 542
 543         /* CRL path validation */
 544         if (ctx->parent)
 545                 {
 546                 allow_proxy_certs = 0;
 547                 purpose = X509_PURPOSE_CRL_SIGN;
 548                 }
 549         else
 550                 {
 551                 allow_proxy_certs =
 552                         !!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
 553                 /* A hack to keep people who don't want to modify their
 554                    software happy */
 555                 if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
 556                         allow_proxy_certs = 1;
 557                 purpose = ctx->param->purpose;
 558                 }
 559
 560         /* Check all untrusted certificates */
 561         for (i = 0; i < ctx->last_untrusted; i++)
 562                 {
 563                 int ret;
 564                 x = sk_X509_value(ctx->chain, i);
 565                 if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
 566                         && (x->ex_flags & EXFLAG_CRITICAL))
 567                         {
 568                         ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;
 569                         ctx->error_depth = i;
 570                         ctx->current_cert = x;
 571                         ok=cb(0,ctx);
 572                         if (!ok) goto end;
 573                         }
 574                 if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY))
 575                         {
 576                         ctx->error = X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED;
 577                         ctx->error_depth = i;
 578                         ctx->current_cert = x;
 579                         ok=cb(0,ctx);
 580                         if (!ok) goto end;
 581                         }
 582                 ret = X509_check_ca(x);
 583                 switch(must_be_ca)
 584                         {
 585                 case -1:
 586                         if ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 587                                 && (ret != 1) && (ret != 0))
 588                                 {
 589                                 ret = 0;
 590                                 ctx->error = X509_V_ERR_INVALID_CA;
 591                                 }
 592                         else
 593                                 ret = 1;
 594                         break;
 595                 case 0:
 596                         if (ret != 0)
 597                                 {
 598                                 ret = 0;
 599                                 ctx->error = X509_V_ERR_INVALID_NON_CA;
 600                                 }
 601                         else
 602                                 ret = 1;
 603                         break;
 604                 default:
 605                         if ((ret == 0)
 606                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 607                                         && (ret != 1)))
 608                                 {
 609                                 ret = 0;
 610                                 ctx->error = X509_V_ERR_INVALID_CA;
 611                                 }
 612                         else
 613                                 ret = 1;
 614                         break;
 615                         }
 616                 if (ret == 0)
 617                         {
 618                         ctx->error_depth = i;
 619                         ctx->current_cert = x;
 620                         ok=cb(0,ctx);
 621                         if (!ok) goto end;
 622                         }
 623                 if (ctx->param->purpose > 0)
 624                         {
 625                         ret = X509_check_purpose(x, purpose, must_be_ca > 0);
 626                         if ((ret == 0)
 627                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 628                                         && (ret != 1)))
 629                                 {
 630                                 ctx->error = X509_V_ERR_INVALID_PURPOSE;
 631                                 ctx->error_depth = i;
 632                                 ctx->current_cert = x;
 633                                 ok=cb(0,ctx);
 634                                 if (!ok) goto end;
 635                                 }
 636                         }
 637                 /* Check pathlen if not self issued */
 638                 if ((i > 1) && !(x->ex_flags & EXFLAG_SI)
 639                            && (x->ex_pathlen != -1)
 640                            && (plen > (x->ex_pathlen + proxy_path_length + 1)))
 641                         {
 642                         ctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;
 643                         ctx->error_depth = i;
 644                         ctx->current_cert = x;
 645                         ok=cb(0,ctx);
 646                         if (!ok) goto end;
 647                         }
 648                 /* Increment path length if not self issued */
 649                 if (!(x->ex_flags & EXFLAG_SI))
 650                         plen++;
 651                 /* If this certificate is a proxy certificate, the next
 652                    certificate must be another proxy certificate or a EE
 653                    certificate.  If not, the next certificate must be a
 654                    CA certificate.  */
 655                 if (x->ex_flags & EXFLAG_PROXY)
 656                         {
 657                         if (x->ex_pcpathlen != -1 && i > x->ex_pcpathlen)
 658                                 {
 659                                 ctx->error =
 660                                         X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED;
 661                                 ctx->error_depth = i;
 662                                 ctx->current_cert = x;
 663                                 ok=cb(0,ctx);
 664                                 if (!ok) goto end;
 665                                 }
 666                         proxy_path_length++;
 667                         must_be_ca = 0;
 668                         }
 669                 else
 670                         must_be_ca = 1;
 671                 }
 672         ok = 1;
 673  end:
 674         return ok;
 675 #endif
 676 }
 677
 678 static int check_name_constraints(X509_STORE_CTX *ctx)
 679         {
 680         X509 *x;
 681         int i, j, rv;
 682         /* Check name constraints for all certificates */
 683         for (i = sk_X509_num(ctx->chain) - 1; i >= 0; i--)
 684                 {
 685                 x = sk_X509_value(ctx->chain, i);
 686                 /* Ignore self issued certs unless last in chain */
 687                 if (i && (x->ex_flags & EXFLAG_SI))
 688                         continue;
 689                 /* Check against constraints for all certificates higher in
 690                  * chain including trust anchor. Trust anchor not strictly
 691                  * speaking needed but if it includes constraints it is to be
 692                  * assumed it expects them to be obeyed.
 693                  */
 694                 for (j = sk_X509_num(ctx->chain) - 1; j > i; j--)
 695                         {
 696                         NAME_CONSTRAINTS *nc = sk_X509_value(ctx->chain, j)->nc;
 697                         if (nc)
 698                                 {
 699                                 rv = NAME_CONSTRAINTS_check(x, nc);
 700                                 if (rv != X509_V_OK)
 701                                         {
 702                                         ctx->error = rv;
 703                                         ctx->error_depth = i;
 704                                         ctx->current_cert = x;
 705                                         if (!ctx->verify_cb(0,ctx))
 706                                                 return 0;
 707                                         }
 708                                 }
 709                         }
 710                 }
 711         return 1;
 712         }
 713
 714 static int check_id_error(X509_STORE_CTX *ctx, int errcode)
 715         {
 716         ctx->error = errcode;
 717         ctx->current_cert = ctx->cert;
 718         ctx->error_depth = 0;
 719         return ctx->verify_cb(0, ctx);
 720         }
 721
 722 static int check_id(X509_STORE_CTX *ctx)
 723         {
 724         X509_VERIFY_PARAM *vpm = ctx->param;
 725         X509_VERIFY_PARAM_ID *id = vpm->id;
 726         X509 *x = ctx->cert;
 727         if (id->host && X509_check_host(x, id->host, 0, id->hostflags) <= 0)
 728                 {
 729                 if (!check_id_error(ctx, X509_V_ERR_HOSTNAME_MISMATCH))
 730                         return 0;
 731                 }
 732         if (id->email && X509_check_email(x, id->email, id->emaillen, 0) <= 0)
 733                 {
 734                 if (!check_id_error(ctx, X509_V_ERR_EMAIL_MISMATCH))
 735                         return 0;
 736                 }
 737         if (id->ip && X509_check_ip(x, id->ip, id->iplen, 0) <= 0)
 738                 {
 739                 if (!check_id_error(ctx, X509_V_ERR_IP_ADDRESS_MISMATCH))
 740                         return 0;
 741                 }
 742         return 1;
 743         }
 744
 745 static int check_trust(X509_STORE_CTX *ctx)
 746 {
 747         int i, ok;
 748         X509 *x = NULL;
 749         int (*cb)(int xok,X509_STORE_CTX *xctx);
 750         cb=ctx->verify_cb;
 751         /* Check all trusted certificates in chain */
 752         for (i = ctx->last_untrusted; i < sk_X509_num(ctx->chain); i++)
 753                 {
 754                 x = sk_X509_value(ctx->chain, i);
 755                 ok = X509_check_trust(x, ctx->param->trust, 0);
 756                 /* If explicitly trusted return trusted */
 757                 if (ok == X509_TRUST_TRUSTED)
 758                         return X509_TRUST_TRUSTED;
 759                 /* If explicitly rejected notify callback and reject if
 760                  * not overridden.
 761                  */
 762                 if (ok == X509_TRUST_REJECTED)
 763                         {
 764                         ctx->error_depth = i;
 765                         ctx->current_cert = x;
 766                         ctx->error = X509_V_ERR_CERT_REJECTED;
 767                         ok = cb(0, ctx);
 768                         if (!ok)
 769                                 return X509_TRUST_REJECTED;
 770                         }
 771                 }
 772         /* If we accept partial chains and have at least one trusted
 773          * certificate return success.
 774          */
 775         if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN)
 776                 {
 777                 X509 *mx;
 778                 if (ctx->last_untrusted < sk_X509_num(ctx->chain))
 779                         return X509_TRUST_TRUSTED;
 780                 x = sk_X509_value(ctx->chain, 0);
 781                 mx = lookup_cert_match(ctx, x);
 782                 if (mx)
 783                         {
 784                         (void)sk_X509_set(ctx->chain, 0, mx);
 785                         X509_free(x);
 786                         ctx->last_untrusted = 0;
 787                         return X509_TRUST_TRUSTED;
 788                         }
 789                 }
 790
 791         /* If no trusted certs in chain at all return untrusted and
 792          * allow standard (no issuer cert) etc errors to be indicated.
 793          */
 794         return X509_TRUST_UNTRUSTED;
 795 }
 796
 797 static int check_revocation(X509_STORE_CTX *ctx)
 798         {
 799         int i, last, ok;
 800         if (!(ctx->param->flags & X509_V_FLAG_CRL_CHECK))
 801                 return 1;
 802         if (ctx->param->flags & X509_V_FLAG_CRL_CHECK_ALL)
 803                 last = sk_X509_num(ctx->chain) - 1;
 804         else
 805                 {
 806                 /* If checking CRL paths this isn't the EE certificate */
 807                 if (ctx->parent)
 808                         return 1;
 809                 last = 0;
 810                 }
 811         for(i = 0; i <= last; i++)
 812                 {
 813                 ctx->error_depth = i;
 814                 ok = check_cert(ctx);
 815                 if (!ok) return ok;
 816                 }
 817         return 1;
 818         }
 819
 820 static int check_cert(X509_STORE_CTX *ctx)
 821         {
 822         X509_CRL *crl = NULL, *dcrl = NULL;
 823         X509 *x;
 824         int ok, cnum;
 825         unsigned int last_reasons;
 826         cnum = ctx->error_depth;
 827         x = sk_X509_value(ctx->chain, cnum);
 828         ctx->current_cert = x;
 829         ctx->current_issuer = NULL;
 830         ctx->current_crl_score = 0;
 831         ctx->current_reasons = 0;
 832         while (ctx->current_reasons != CRLDP_ALL_REASONS)
 833                 {
 834                 last_reasons = ctx->current_reasons;
 835                 /* Try to retrieve relevant CRL */
 836                 if (ctx->get_crl)
 837                         ok = ctx->get_crl(ctx, &crl, x);
 838                 else
 839                         ok = get_crl_delta(ctx, &crl, &dcrl, x);
 840                 /* If error looking up CRL, nothing we can do except
 841                  * notify callback
 842                  */
 843                 if(!ok)
 844                         {
 845                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
 846                         ok = ctx->verify_cb(0, ctx);
 847                         goto err;
 848                         }
 849                 ctx->current_crl = crl;
 850                 ok = ctx->check_crl(ctx, crl);
 851                 if (!ok)
 852                         goto err;
 853
 854                 if (dcrl)
 855                         {
 856                         ok = ctx->check_crl(ctx, dcrl);
 857                         if (!ok)
 858                                 goto err;
 859                         ok = ctx->cert_crl(ctx, dcrl, x);
 860                         if (!ok)
 861                                 goto err;
 862                         }
 863                 else
 864                         ok = 1;
 865
 866                 /* Don't look in full CRL if delta reason is removefromCRL */
 867                 if (ok != 2)
 868                         {
 869                         ok = ctx->cert_crl(ctx, crl, x);
 870                         if (!ok)
 871                                 goto err;
 872                         }
 873
 874                 X509_CRL_free(crl);
 875                 X509_CRL_free(dcrl);
 876                 crl = NULL;
 877                 dcrl = NULL;
 878                 /* If reasons not updated we wont get anywhere by
 879                  * another iteration, so exit loop.
 880                  */
 881                 if (last_reasons == ctx->current_reasons)
 882                         {
 883                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
 884                         ok = ctx->verify_cb(0, ctx);
 885                         goto err;
 886                         }
 887                 }
 888         err:
 889         X509_CRL_free(crl);
 890         X509_CRL_free(dcrl);
 891
 892         ctx->current_crl = NULL;
 893         return ok;
 894
 895         }
 896
 897 /* Check CRL times against values in X509_STORE_CTX */
 898
 899 static int check_crl_time(X509_STORE_CTX *ctx, X509_CRL *crl, int notify)
 900         {
 901         time_t *ptime;
 902         int i;
 903         if (notify)
 904                 ctx->current_crl = crl;
 905         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
 906                 ptime = &ctx->param->check_time;
 907         else
 908                 ptime = NULL;
 909
 910         i=X509_cmp_time(X509_CRL_get_lastUpdate(crl), ptime);
 911         if (i == 0)
 912                 {
 913                 if (!notify)
 914                         return 0;
 915                 ctx->error=X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD;
 916                 if (!ctx->verify_cb(0, ctx))
 917                         return 0;
 918                 }
 919
 920         if (i > 0)
 921                 {
 922                 if (!notify)
 923                         return 0;
 924                 ctx->error=X509_V_ERR_CRL_NOT_YET_VALID;
 925                 if (!ctx->verify_cb(0, ctx))
 926                         return 0;
 927                 }
 928
 929         if(X509_CRL_get_nextUpdate(crl))
 930                 {
 931                 i=X509_cmp_time(X509_CRL_get_nextUpdate(crl), ptime);
 932
 933                 if (i == 0)
 934                         {
 935                         if (!notify)
 936                                 return 0;
 937                         ctx->error=X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD;
 938                         if (!ctx->verify_cb(0, ctx))
 939                                 return 0;
 940                         }
 941                 /* Ignore expiry of base CRL is delta is valid */
 942                 if ((i < 0) && !(ctx->current_crl_score & CRL_SCORE_TIME_DELTA))
 943                         {
 944                         if (!notify)
 945                                 return 0;
 946                         ctx->error=X509_V_ERR_CRL_HAS_EXPIRED;
 947                         if (!ctx->verify_cb(0, ctx))
 948                                 return 0;
 949                         }
 950                 }
 951
 952         if (notify)
 953                 ctx->current_crl = NULL;
 954
 955         return 1;
 956         }
 957
 958 static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl,
 959                         X509 **pissuer, int *pscore, unsigned int *preasons,
 960                         STACK_OF(X509_CRL) *crls)
 961         {
 962         int i, crl_score, best_score = *pscore;
 963         unsigned int reasons, best_reasons = 0;
 964         X509 *x = ctx->current_cert;
 965         X509_CRL *crl, *best_crl = NULL;
 966         X509 *crl_issuer = NULL, *best_crl_issuer = NULL;
 967
 968         for (i = 0; i < sk_X509_CRL_num(crls); i++)
 969                 {
 970                 crl = sk_X509_CRL_value(crls, i);
 971                 reasons = *preasons;
 972                 crl_score = get_crl_score(ctx, &crl_issuer, &reasons, crl, x);
 973
 974                 if (crl_score > best_score)
 975                         {
 976                         best_crl = crl;
 977                         best_crl_issuer = crl_issuer;
 978                         best_score = crl_score;
 979                         best_reasons = reasons;
 980                         }
 981                 }
 982
 983         if (best_crl)
 984                 {
 985                 if (*pcrl)
 986                         X509_CRL_free(*pcrl);
 987                 *pcrl = best_crl;
 988                 *pissuer = best_crl_issuer;
 989                 *pscore = best_score;
 990                 *preasons = best_reasons;
 991                 CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509_CRL);
 992                 if (*pdcrl)
 993                         {
 994                         X509_CRL_free(*pdcrl);
 995                         *pdcrl = NULL;
 996                         }
 997                 get_delta_sk(ctx, pdcrl, pscore, best_crl, crls);
 998                 }
 999
1000         if (best_score >= CRL_SCORE_VALID)
1001                 return 1;
1002
1003         return 0;
1004         }
1005
1006 /* Compare two CRL extensions for delta checking purposes. They should be
1007  * both present or both absent. If both present all fields must be identical.
1008  */
1009
1010 static int crl_extension_match(X509_CRL *a, X509_CRL *b, int nid)
1011         {
1012         ASN1_OCTET_STRING *exta, *extb;
1013         int i;
1014         i = X509_CRL_get_ext_by_NID(a, nid, -1);
1015         if (i >= 0)
1016                 {
1017                 /* Can't have multiple occurrences */
1018                 if (X509_CRL_get_ext_by_NID(a, nid, i) != -1)
1019                         return 0;
1020                 exta = X509_EXTENSION_get_data(X509_CRL_get_ext(a, i));
1021                 }
1022         else
1023                 exta = NULL;
1024
1025         i = X509_CRL_get_ext_by_NID(b, nid, -1);
1026
1027         if (i >= 0)
1028                 {
1029
1030                 if (X509_CRL_get_ext_by_NID(b, nid, i) != -1)
1031                         return 0;
1032                 extb = X509_EXTENSION_get_data(X509_CRL_get_ext(b, i));
1033                 }
1034         else
1035                 extb = NULL;
1036
1037         if (!exta && !extb)
1038                 return 1;
1039
1040         if (!exta || !extb)
1041                 return 0;
1042
1043
1044         if (ASN1_OCTET_STRING_cmp(exta, extb))
1045                 return 0;
1046
1047         return 1;
1048         }
1049
1050 /* See if a base and delta are compatible */
1051
1052 static int check_delta_base(X509_CRL *delta, X509_CRL *base)
1053         {
1054         /* Delta CRL must be a delta */
1055         if (!delta->base_crl_number)
1056                         return 0;
1057         /* Base must have a CRL number */
1058         if (!base->crl_number)
1059                         return 0;
1060         /* Issuer names must match */
1061         if (X509_NAME_cmp(X509_CRL_get_issuer(base),
1062                                 X509_CRL_get_issuer(delta)))
1063                 return 0;
1064         /* AKID and IDP must match */
1065         if (!crl_extension_match(delta, base, NID_authority_key_identifier))
1066                         return 0;
1067         if (!crl_extension_match(delta, base, NID_issuing_distribution_point))
1068                         return 0;
1069         /* Delta CRL base number must not exceed Full CRL number. */
1070         if (ASN1_INTEGER_cmp(delta->base_crl_number, base->crl_number) > 0)
1071                         return 0;
1072         /* Delta CRL number must exceed full CRL number */
1073         if (ASN1_INTEGER_cmp(delta->crl_number, base->crl_number) > 0)
1074                         return 1;
1075         return 0;
1076         }
1077
1078 /* For a given base CRL find a delta... maybe extend to delta scoring
1079  * or retrieve a chain of deltas...
1080  */
1081
1082 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pscore,
1083                         X509_CRL *base, STACK_OF(X509_CRL) *crls)
1084         {
1085         X509_CRL *delta;
1086         int i;
1087         if (!(ctx->param->flags & X509_V_FLAG_USE_DELTAS))
1088                 return;
1089         if (!((ctx->current_cert->ex_flags | base->flags) & EXFLAG_FRESHEST))
1090                 return;
1091         for (i = 0; i < sk_X509_CRL_num(crls); i++)
1092                 {
1093                 delta = sk_X509_CRL_value(crls, i);
1094                 if (check_delta_base(delta, base))
1095                         {
1096                         if (check_crl_time(ctx, delta, 0))
1097                                 *pscore |= CRL_SCORE_TIME_DELTA;
1098                         CRYPTO_add(&delta->references, 1, CRYPTO_LOCK_X509_CRL);
1099                         *dcrl = delta;
1100                         return;
1101                         }
1102                 }
1103         *dcrl = NULL;
1104         }
1105
1106 /* For a given CRL return how suitable it is for the supplied certificate 'x'.
1107  * The return value is a mask of several criteria.
1108  * If the issuer is not the certificate issuer this is returned in *pissuer.
1109  * The reasons mask is also used to determine if the CRL is suitable: if
1110  * no new reasons the CRL is rejected, otherwise reasons is updated.
1111  */
1112
1113 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
1114                         unsigned int *preasons,
1115                         X509_CRL *crl, X509 *x)
1116         {
1117
1118         int crl_score = 0;
1119         unsigned int tmp_reasons = *preasons, crl_reasons;
1120
1121         /* First see if we can reject CRL straight away */
1122
1123         /* Invalid IDP cannot be processed */
1124         if (crl->idp_flags & IDP_INVALID)
1125                 return 0;
1126         /* Reason codes or indirect CRLs need extended CRL support */
1127         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1128                 {
1129                 if (crl->idp_flags & (IDP_INDIRECT | IDP_REASONS))
1130                         return 0;
1131                 }
1132         else if (crl->idp_flags & IDP_REASONS)
1133                 {
1134                 /* If no new reasons reject */
1135                 if (!(crl->idp_reasons & ~tmp_reasons))
1136                         return 0;
1137                 }
1138         /* Don't process deltas at this stage */
1139         else if (crl->base_crl_number)
1140                 return 0;
1141         /* If issuer name doesn't match certificate need indirect CRL */
1142         if (X509_NAME_cmp(X509_get_issuer_name(x), X509_CRL_get_issuer(crl)))
1143                 {
1144                 if (!(crl->idp_flags & IDP_INDIRECT))
1145                         return 0;
1146                 }
1147         else
1148                 crl_score |= CRL_SCORE_ISSUER_NAME;
1149
1150         if (!(crl->flags & EXFLAG_CRITICAL))
1151                 crl_score |= CRL_SCORE_NOCRITICAL;
1152
1153         /* Check expiry */
1154         if (check_crl_time(ctx, crl, 0))
1155                 crl_score |= CRL_SCORE_TIME;
1156
1157         /* Check authority key ID and locate certificate issuer */
1158         crl_akid_check(ctx, crl, pissuer, &crl_score);
1159
1160         /* If we can't locate certificate issuer at this point forget it */
1161
1162         if (!(crl_score & CRL_SCORE_AKID))
1163                 return 0;
1164
1165         /* Check cert for matching CRL distribution points */
1166
1167         if (crl_crldp_check(x, crl, crl_score, &crl_reasons))
1168                 {
1169                 /* If no new reasons reject */
1170                 if (!(crl_reasons & ~tmp_reasons))
1171                         return 0;
1172                 tmp_reasons |= crl_reasons;
1173                 crl_score |= CRL_SCORE_SCOPE;
1174                 }
1175
1176         *preasons = tmp_reasons;
1177
1178         return crl_score;
1179
1180         }
1181
1182 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
1183                                 X509 **pissuer, int *pcrl_score)
1184         {
1185         X509 *crl_issuer = NULL;
1186         X509_NAME *cnm = X509_CRL_get_issuer(crl);
1187         int cidx = ctx->error_depth;
1188         int i;
1189
1190         if (cidx != sk_X509_num(ctx->chain) - 1)
1191                 cidx++;
1192
1193         crl_issuer = sk_X509_value(ctx->chain, cidx);
1194
1195         if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1196                 {
1197                 if (*pcrl_score & CRL_SCORE_ISSUER_NAME)
1198                         {
1199                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_ISSUER_CERT;
1200                         *pissuer = crl_issuer;
1201                         return;
1202                         }
1203                 }
1204
1205         for (cidx++; cidx < sk_X509_num(ctx->chain); cidx++)
1206                 {
1207                 crl_issuer = sk_X509_value(ctx->chain, cidx);
1208                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1209                         continue;
1210                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1211                         {
1212                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_SAME_PATH;
1213                         *pissuer = crl_issuer;
1214                         return;
1215                         }
1216                 }
1217
1218         /* Anything else needs extended CRL support */
1219
1220         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1221                 return;
1222
1223         /* Otherwise the CRL issuer is not on the path. Look for it in the
1224          * set of untrusted certificates.
1225          */
1226         for (i = 0; i < sk_X509_num(ctx->untrusted); i++)
1227                 {
1228                 crl_issuer = sk_X509_value(ctx->untrusted, i);
1229                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1230                         continue;
1231                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1232                         {
1233                         *pissuer = crl_issuer;
1234                         *pcrl_score |= CRL_SCORE_AKID;
1235                         return;
1236                         }
1237                 }
1238         }
1239
1240 /* Check the path of a CRL issuer certificate. This creates a new
1241  * X509_STORE_CTX and populates it with most of the parameters from the
1242  * parent. This could be optimised somewhat since a lot of path checking
1243  * will be duplicated by the parent, but this will rarely be used in
1244  * practice.
1245  */
1246
1247 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x)
1248         {
1249         X509_STORE_CTX crl_ctx;
1250         int ret;
1251         /* Don't allow recursive CRL path validation */
1252         if (ctx->parent)
1253                 return 0;
1254         if (!X509_STORE_CTX_init(&crl_ctx, ctx->ctx, x, ctx->untrusted))
1255                 return -1;
1256
1257         crl_ctx.crls = ctx->crls;
1258         /* Copy verify params across */
1259         X509_STORE_CTX_set0_param(&crl_ctx, ctx->param);
1260
1261         crl_ctx.parent = ctx;
1262         crl_ctx.verify_cb = ctx->verify_cb;
1263
1264         /* Verify CRL issuer */
1265         ret = X509_verify_cert(&crl_ctx);
1266
1267         if (ret <= 0)
1268                 goto err;
1269
1270         /* Check chain is acceptable */
1271
1272         ret = check_crl_chain(ctx, ctx->chain, crl_ctx.chain);
1273         err:
1274         X509_STORE_CTX_cleanup(&crl_ctx);
1275         return ret;
1276         }
1277
1278 /* RFC3280 says nothing about the relationship between CRL path
1279  * and certificate path, which could lead to situations where a
1280  * certificate could be revoked or validated by a CA not authorised
1281  * to do so. RFC5280 is more strict and states that the two paths must
1282  * end in the same trust anchor, though some discussions remain...
1283  * until this is resolved we use the RFC5280 version
1284  */
1285
1286 static int check_crl_chain(X509_STORE_CTX *ctx,
1287                         STACK_OF(X509) *cert_path,
1288                         STACK_OF(X509) *crl_path)
1289         {
1290         X509 *cert_ta, *crl_ta;
1291         cert_ta = sk_X509_value(cert_path, sk_X509_num(cert_path) - 1);
1292         crl_ta = sk_X509_value(crl_path, sk_X509_num(crl_path) - 1);
1293         if (!X509_cmp(cert_ta, crl_ta))
1294                 return 1;
1295         return 0;
1296         }
1297
1298 /* Check for match between two dist point names: three separate cases.
1299  * 1. Both are relative names and compare X509_NAME types.
1300  * 2. One full, one relative. Compare X509_NAME to GENERAL_NAMES.
1301  * 3. Both are full names and compare two GENERAL_NAMES.
1302  * 4. One is NULL: automatic match.
1303  */
1304
1305
1306 static int idp_check_dp(DIST_POINT_NAME *a, DIST_POINT_NAME *b)
1307         {
1308         X509_NAME *nm = NULL;
1309         GENERAL_NAMES *gens = NULL;
1310         GENERAL_NAME *gena, *genb;
1311         int i, j;
1312         if (!a || !b)
1313                 return 1;
1314         if (a->type == 1)
1315                 {
1316                 if (!a->dpname)
1317                         return 0;
1318                 /* Case 1: two X509_NAME */
1319                 if (b->type == 1)
1320                         {
1321                         if (!b->dpname)
1322                                 return 0;
1323                         if (!X509_NAME_cmp(a->dpname, b->dpname))
1324                                 return 1;
1325                         else
1326                                 return 0;
1327                         }
1328                 /* Case 2: set name and GENERAL_NAMES appropriately */
1329                 nm = a->dpname;
1330                 gens = b->name.fullname;
1331                 }
1332         else if (b->type == 1)
1333                 {
1334                 if (!b->dpname)
1335                         return 0;
1336                 /* Case 2: set name and GENERAL_NAMES appropriately */
1337                 gens = a->name.fullname;
1338                 nm = b->dpname;
1339                 }
1340
1341         /* Handle case 2 with one GENERAL_NAMES and one X509_NAME */
1342         if (nm)
1343                 {
1344                 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++)
1345                         {
1346                         gena = sk_GENERAL_NAME_value(gens, i);
1347                         if (gena->type != GEN_DIRNAME)
1348                                 continue;
1349                         if (!X509_NAME_cmp(nm, gena->d.directoryName))
1350                                 return 1;
1351                         }
1352                 return 0;
1353                 }
1354
1355         /* Else case 3: two GENERAL_NAMES */
1356
1357         for (i = 0; i < sk_GENERAL_NAME_num(a->name.fullname); i++)
1358                 {
1359                 gena = sk_GENERAL_NAME_value(a->name.fullname, i);
1360                 for (j = 0; j < sk_GENERAL_NAME_num(b->name.fullname); j++)
1361                         {
1362                         genb = sk_GENERAL_NAME_value(b->name.fullname, j);
1363                         if (!GENERAL_NAME_cmp(gena, genb))
1364                                 return 1;
1365                         }
1366                 }
1367
1368         return 0;
1369
1370         }
1371
1372 static int crldp_check_crlissuer(DIST_POINT *dp, X509_CRL *crl, int crl_score)
1373         {
1374         int i;
1375         X509_NAME *nm = X509_CRL_get_issuer(crl);
1376         /* If no CRLissuer return is successful iff don't need a match */
1377         if (!dp->CRLissuer)
1378                 return !!(crl_score & CRL_SCORE_ISSUER_NAME);
1379         for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++)
1380                 {
1381                 GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
1382                 if (gen->type != GEN_DIRNAME)
1383                         continue;
1384                 if (!X509_NAME_cmp(gen->d.directoryName, nm))
1385                         return 1;
1386                 }
1387         return 0;
1388         }
1389
1390 /* Check CRLDP and IDP */
1391
1392 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
1393                                 unsigned int *preasons)
1394         {
1395         int i;
1396         if (crl->idp_flags & IDP_ONLYATTR)
1397                 return 0;
1398         if (x->ex_flags & EXFLAG_CA)
1399                 {
1400                 if (crl->idp_flags & IDP_ONLYUSER)
1401                         return 0;
1402                 }
1403         else
1404                 {
1405                 if (crl->idp_flags & IDP_ONLYCA)
1406                         return 0;
1407                 }
1408         *preasons = crl->idp_reasons;
1409         for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++)
1410                 {
1411                 DIST_POINT *dp = sk_DIST_POINT_value(x->crldp, i);
1412                 if (crldp_check_crlissuer(dp, crl, crl_score))
1413                         {
1414                         if (!crl->idp ||
1415                              idp_check_dp(dp->distpoint, crl->idp->distpoint))
1416                                 {
1417                                 *preasons &= dp->dp_reasons;
1418                                 return 1;
1419                                 }
1420                         }
1421                 }
1422         if ((!crl->idp || !crl->idp->distpoint) && (crl_score & CRL_SCORE_ISSUER_NAME))
1423                 return 1;
1424         return 0;
1425         }
1426
1427 /* Retrieve CRL corresponding to current certificate.
1428  * If deltas enabled try to find a delta CRL too
1429  */
1430
1431 static int get_crl_delta(X509_STORE_CTX *ctx,
1432                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)
1433         {
1434         int ok;
1435         X509 *issuer = NULL;
1436         int crl_score = 0;
1437         unsigned int reasons;
1438         X509_CRL *crl = NULL, *dcrl = NULL;
1439         STACK_OF(X509_CRL) *skcrl;
1440         X509_NAME *nm = X509_get_issuer_name(x);
1441         reasons = ctx->current_reasons;
1442         ok = get_crl_sk(ctx, &crl, &dcrl,
1443                                 &issuer, &crl_score, &reasons, ctx->crls);
1444
1445         if (ok)
1446                 goto done;
1447
1448         /* Lookup CRLs from store */
1449
1450         skcrl = ctx->lookup_crls(ctx, nm);
1451
1452         /* If no CRLs found and a near match from get_crl_sk use that */
1453         if (!skcrl && crl)
1454                 goto done;
1455
1456         get_crl_sk(ctx, &crl, &dcrl, &issuer, &crl_score, &reasons, skcrl);
1457
1458         sk_X509_CRL_pop_free(skcrl, X509_CRL_free);
1459
1460         done:
1461
1462         /* If we got any kind of CRL use it and return success */
1463         if (crl)
1464                 {
1465                 ctx->current_issuer = issuer;
1466                 ctx->current_crl_score = crl_score;
1467                 ctx->current_reasons = reasons;
1468                 *pcrl = crl;
1469                 *pdcrl = dcrl;
1470                 return 1;
1471                 }
1472
1473         return 0;
1474         }
1475
1476 /* Check CRL validity */
1477 static int check_crl(X509_STORE_CTX *ctx, X509_CRL *crl)
1478         {
1479         X509 *issuer = NULL;
1480         EVP_PKEY *ikey = NULL;
1481         int ok = 0, chnum, cnum;
1482         cnum = ctx->error_depth;
1483         chnum = sk_X509_num(ctx->chain) - 1;
1484         /* if we have an alternative CRL issuer cert use that */
1485         if (ctx->current_issuer)
1486                 issuer = ctx->current_issuer;
1487
1488         /* Else find CRL issuer: if not last certificate then issuer
1489          * is next certificate in chain.
1490          */
1491         else if (cnum < chnum)
1492                 issuer = sk_X509_value(ctx->chain, cnum + 1);
1493         else
1494                 {
1495                 issuer = sk_X509_value(ctx->chain, chnum);
1496                 /* If not self signed, can't check signature */
1497                 if(!ctx->check_issued(ctx, issuer, issuer))
1498                         {
1499                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER;
1500                         ok = ctx->verify_cb(0, ctx);
1501                         if(!ok) goto err;
1502                         }
1503                 }
1504
1505         if(issuer)
1506                 {
1507                 /* Skip most tests for deltas because they have already
1508                  * been done
1509                  */
1510                 if (!crl->base_crl_number)
1511                         {
1512                         /* Check for cRLSign bit if keyUsage present */
1513                         if ((issuer->ex_flags & EXFLAG_KUSAGE) &&
1514                                 !(issuer->ex_kusage & KU_CRL_SIGN))
1515                                 {
1516                                 ctx->error = X509_V_ERR_KEYUSAGE_NO_CRL_SIGN;
1517                                 ok = ctx->verify_cb(0, ctx);
1518                                 if(!ok) goto err;
1519                                 }
1520
1521                         if (!(ctx->current_crl_score & CRL_SCORE_SCOPE))
1522                                 {
1523                                 ctx->error = X509_V_ERR_DIFFERENT_CRL_SCOPE;
1524                                 ok = ctx->verify_cb(0, ctx);
1525                                 if(!ok) goto err;
1526                                 }
1527
1528                         if (!(ctx->current_crl_score & CRL_SCORE_SAME_PATH))
1529                                 {
1530                                 if (check_crl_path(ctx, ctx->current_issuer) <= 0)
1531                                         {
1532                                         ctx->error = X509_V_ERR_CRL_PATH_VALIDATION_ERROR;
1533                                         ok = ctx->verify_cb(0, ctx);
1534                                         if(!ok) goto err;
1535                                         }
1536                                 }
1537
1538                         if (crl->idp_flags & IDP_INVALID)
1539                                 {
1540                                 ctx->error = X509_V_ERR_INVALID_EXTENSION;
1541                                 ok = ctx->verify_cb(0, ctx);
1542                                 if(!ok) goto err;
1543                                 }
1544
1545
1546                         }
1547
1548                 if (!(ctx->current_crl_score & CRL_SCORE_TIME))
1549                         {
1550                         ok = check_crl_time(ctx, crl, 1);
1551                         if (!ok)
1552                                 goto err;
1553                         }
1554
1555                 /* Attempt to get issuer certificate public key */
1556                 ikey = X509_get_pubkey(issuer);
1557
1558                 if(!ikey)
1559                         {
1560                         ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1561                         ok = ctx->verify_cb(0, ctx);
1562                         if (!ok) goto err;
1563                         }
1564                 else
1565                         {
1566                         int rv;
1567                         rv = X509_CRL_check_suiteb(crl, ikey, ctx->param->flags);
1568                         if (rv != X509_V_OK)
1569                                 {
1570                                 ctx->error=rv;
1571                                 ok = ctx->verify_cb(0, ctx);
1572                                 if (!ok)
1573                                         goto err;
1574                                 }
1575                         /* Verify CRL signature */
1576                         if(X509_CRL_verify(crl, ikey) <= 0)
1577                                 {
1578                                 ctx->error=X509_V_ERR_CRL_SIGNATURE_FAILURE;
1579                                 ok = ctx->verify_cb(0, ctx);
1580                                 if (!ok) goto err;
1581                                 }
1582                         }
1583                 }
1584
1585         ok = 1;
1586
1587         err:
1588         EVP_PKEY_free(ikey);
1589         return ok;
1590         }
1591
1592 /* Check certificate against CRL */
1593 static int cert_crl(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x)
1594         {
1595         int ok;
1596         X509_REVOKED *rev;
1597         /* The rules changed for this... previously if a CRL contained
1598          * unhandled critical extensions it could still be used to indicate
1599          * a certificate was revoked. This has since been changed since
1600          * critical extension can change the meaning of CRL entries.
1601          */
1602         if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
1603                 && (crl->flags & EXFLAG_CRITICAL))
1604                 {
1605                 ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION;
1606                 ok = ctx->verify_cb(0, ctx);
1607                 if(!ok)
1608                         return 0;
1609                 }
1610         /* Look for serial number of certificate in CRL
1611          * If found make sure reason is not removeFromCRL.
1612          */
1613         if (X509_CRL_get0_by_cert(crl, &rev, x))
1614                 {
1615                 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
1616                         return 2;
1617                 ctx->error = X509_V_ERR_CERT_REVOKED;
1618                 ok = ctx->verify_cb(0, ctx);
1619                 if (!ok)
1620                         return 0;
1621                 }
1622
1623         return 1;
1624         }
1625
1626 static int check_policy(X509_STORE_CTX *ctx)
1627         {
1628         int ret;
1629         if (ctx->parent)
1630                 return 1;
1631         ret = X509_policy_check(&ctx->tree, &ctx->explicit_policy, ctx->chain,
1632                                 ctx->param->policies, ctx->param->flags);
1633         if (ret == 0)
1634                 {
1635                 X509err(X509_F_CHECK_POLICY,ERR_R_MALLOC_FAILURE);
1636                 return 0;
1637                 }
1638         /* Invalid or inconsistent extensions */
1639         if (ret == -1)
1640                 {
1641                 /* Locate certificates with bad extensions and notify
1642                  * callback.
1643                  */
1644                 X509 *x;
1645                 int i;
1646                 for (i = 1; i < sk_X509_num(ctx->chain); i++)
1647                         {
1648                         x = sk_X509_value(ctx->chain, i);
1649                         if (!(x->ex_flags & EXFLAG_INVALID_POLICY))
1650                                 continue;
1651                         ctx->current_cert = x;
1652                         ctx->error = X509_V_ERR_INVALID_POLICY_EXTENSION;
1653                         if(!ctx->verify_cb(0, ctx))
1654                                 return 0;
1655                         }
1656                 return 1;
1657                 }
1658         if (ret == -2)
1659                 {
1660                 ctx->current_cert = NULL;
1661                 ctx->error = X509_V_ERR_NO_EXPLICIT_POLICY;
1662                 return ctx->verify_cb(0, ctx);
1663                 }
1664
1665         if (ctx->param->flags & X509_V_FLAG_NOTIFY_POLICY)
1666                 {
1667                 ctx->current_cert = NULL;
1668                 ctx->error = X509_V_OK;
1669                 if (!ctx->verify_cb(2, ctx))
1670                         return 0;
1671                 }
1672
1673         return 1;
1674         }
1675
1676 static int check_cert_time(X509_STORE_CTX *ctx, X509 *x)
1677         {
1678         time_t *ptime;
1679         int i;
1680
1681         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
1682                 ptime = &ctx->param->check_time;
1683         else
1684                 ptime = NULL;
1685
1686         i=X509_cmp_time(X509_get_notBefore(x), ptime);
1687         if (i == 0)
1688                 {
1689                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
1690                 ctx->current_cert=x;
1691                 if (!ctx->verify_cb(0, ctx))
1692                         return 0;
1693                 }
1694
1695         if (i > 0)
1696                 {
1697                 ctx->error=X509_V_ERR_CERT_NOT_YET_VALID;
1698                 ctx->current_cert=x;
1699                 if (!ctx->verify_cb(0, ctx))
1700                         return 0;
1701                 }
1702
1703         i=X509_cmp_time(X509_get_notAfter(x), ptime);
1704         if (i == 0)
1705                 {
1706                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
1707                 ctx->current_cert=x;
1708                 if (!ctx->verify_cb(0, ctx))
1709                         return 0;
1710                 }
1711
1712         if (i < 0)
1713                 {
1714                 ctx->error=X509_V_ERR_CERT_HAS_EXPIRED;
1715                 ctx->current_cert=x;
1716                 if (!ctx->verify_cb(0, ctx))
1717                         return 0;
1718                 }
1719
1720         return 1;
1721         }
1722
1723 static int internal_verify(X509_STORE_CTX *ctx)
1724         {
1725         int ok=0,n;
1726         X509 *xs,*xi;
1727         EVP_PKEY *pkey=NULL;
1728         int (*cb)(int xok,X509_STORE_CTX *xctx);
1729
1730         cb=ctx->verify_cb;
1731
1732         n=sk_X509_num(ctx->chain);
1733         ctx->error_depth=n-1;
1734         n--;
1735         xi=sk_X509_value(ctx->chain,n);
1736
1737         if (ctx->check_issued(ctx, xi, xi))
1738                 xs=xi;
1739         else
1740                 {
1741                 if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN)
1742                         {
1743                         xs = xi;
1744                         goto check_cert;
1745                         }
1746                 if (n <= 0)
1747                         {
1748                         ctx->error=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
1749                         ctx->current_cert=xi;
1750                         ok=cb(0,ctx);
1751                         goto end;
1752                         }
1753                 else
1754                         {
1755                         n--;
1756                         ctx->error_depth=n;
1757                         xs=sk_X509_value(ctx->chain,n);
1758                         }
1759                 }
1760
1761 /*      ctx->error=0;  not needed */
1762         while (n >= 0)
1763                 {
1764                 ctx->error_depth=n;
1765
1766                 /* Skip signature check for self signed certificates unless
1767                  * explicitly asked for. It doesn't add any security and
1768                  * just wastes time.
1769                  */
1770                 if (!xs->valid && (xs != xi || (ctx->param->flags & X509_V_FLAG_CHECK_SS_SIGNATURE)))
1771                         {
1772                         if ((pkey=X509_get_pubkey(xi)) == NULL)
1773                                 {
1774                                 ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1775                                 ctx->current_cert=xi;
1776                                 ok=(*cb)(0,ctx);
1777                                 if (!ok) goto end;
1778                                 }
1779                         else if (X509_verify(xs,pkey) <= 0)
1780                                 {
1781                                 ctx->error=X509_V_ERR_CERT_SIGNATURE_FAILURE;
1782                                 ctx->current_cert=xs;
1783                                 ok=(*cb)(0,ctx);
1784                                 if (!ok)
1785                                         {
1786                                         EVP_PKEY_free(pkey);
1787                                         goto end;
1788                                         }
1789                                 }
1790                         EVP_PKEY_free(pkey);
1791                         pkey=NULL;
1792                         }
1793
1794                 xs->valid = 1;
1795
1796                 check_cert:
1797                 ok = check_cert_time(ctx, xs);
1798                 if (!ok)
1799                         goto end;
1800
1801                 /* The last error (if any) is still in the error value */
1802                 ctx->current_issuer=xi;
1803                 ctx->current_cert=xs;
1804                 ok=(*cb)(1,ctx);
1805                 if (!ok) goto end;
1806
1807                 n--;
1808                 if (n >= 0)
1809                         {
1810                         xi=xs;
1811                         xs=sk_X509_value(ctx->chain,n);
1812                         }
1813                 }
1814         ok=1;
1815 end:
1816         return ok;
1817         }
1818
1819 int X509_cmp_current_time(const ASN1_TIME *ctm)
1820 {
1821         return X509_cmp_time(ctm, NULL);
1822 }
1823
1824 int X509_cmp_time(const ASN1_TIME *ctm, time_t *cmp_time)
1825         {
1826         char *str;
1827         ASN1_TIME atm;
1828         long offset;
1829         char buff1[24],buff2[24],*p;
1830         int i,j;
1831
1832         p=buff1;
1833         i=ctm->length;
1834         str=(char *)ctm->data;
1835         if (ctm->type == V_ASN1_UTCTIME)
1836                 {
1837                 if ((i < 11) || (i > 17)) return 0;
1838                 memcpy(p,str,10);
1839                 p+=10;
1840                 str+=10;
1841                 }
1842         else
1843                 {
1844                 if (i < 13) return 0;
1845                 memcpy(p,str,12);
1846                 p+=12;
1847                 str+=12;
1848                 }
1849
1850         if ((*str == 'Z') || (*str == '-') || (*str == '+'))
1851                 { *(p++)='0'; *(p++)='0'; }
1852         else
1853                 {
1854                 *(p++)= *(str++);
1855                 *(p++)= *(str++);
1856                 /* Skip any fractional seconds... */
1857                 if (*str == '.')
1858                         {
1859                         str++;
1860                         while ((*str >= '0') && (*str <= '9')) str++;
1861                         }
1862
1863                 }
1864         *(p++)='Z';
1865         *(p++)='\0';
1866
1867         if (*str == 'Z')
1868                 offset=0;
1869         else
1870                 {
1871                 if ((*str != '+') && (*str != '-'))
1872                         return 0;
1873                 offset=((str[1]-'0')*10+(str[2]-'0'))*60;
1874                 offset+=(str[3]-'0')*10+(str[4]-'0');
1875                 if (*str == '-')
1876                         offset= -offset;
1877                 }
1878         atm.type=ctm->type;
1879         atm.flags = 0;
1880         atm.length=sizeof(buff2);
1881         atm.data=(unsigned char *)buff2;
1882
1883         if (X509_time_adj(&atm, offset*60, cmp_time) == NULL)
1884                 return 0;
1885
1886         if (ctm->type == V_ASN1_UTCTIME)
1887                 {
1888                 i=(buff1[0]-'0')*10+(buff1[1]-'0');
1889                 if (i < 50) i+=100; /* cf. RFC 2459 */
1890                 j=(buff2[0]-'0')*10+(buff2[1]-'0');
1891                 if (j < 50) j+=100;
1892
1893                 if (i < j) return -1;
1894                 if (i > j) return 1;
1895                 }
1896         i=strcmp(buff1,buff2);
1897         if (i == 0) /* wait a second then return younger :-) */
1898                 return -1;
1899         else
1900                 return i;
1901         }
1902
1903 ASN1_TIME *X509_gmtime_adj(ASN1_TIME *s, long adj)
1904 {
1905         return X509_time_adj(s, adj, NULL);
1906 }
1907
1908 ASN1_TIME *X509_time_adj(ASN1_TIME *s, long offset_sec, time_t *in_tm)
1909         {
1910         return X509_time_adj_ex(s, 0, offset_sec, in_tm);
1911         }
1912
1913 ASN1_TIME *X509_time_adj_ex(ASN1_TIME *s,
1914                                 int offset_day, long offset_sec, time_t *in_tm)
1915         {
1916         time_t t;
1917
1918         if (in_tm) t = *in_tm;
1919         else time(&t);
1920
1921         if (s && !(s->flags & ASN1_STRING_FLAG_MSTRING))
1922                 {
1923                 if (s->type == V_ASN1_UTCTIME)
1924                         return ASN1_UTCTIME_adj(s,t, offset_day, offset_sec);
1925                 if (s->type == V_ASN1_GENERALIZEDTIME)
1926                         return ASN1_GENERALIZEDTIME_adj(s, t, offset_day,
1927                                                                 offset_sec);
1928                 }
1929         return ASN1_TIME_adj(s, t, offset_day, offset_sec);
1930         }
1931
1932 int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain)
1933         {
1934         EVP_PKEY *ktmp=NULL,*ktmp2;
1935         int i,j;
1936
1937         if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) return 1;
1938
1939         for (i=0; i<sk_X509_num(chain); i++)
1940                 {
1941                 ktmp=X509_get_pubkey(sk_X509_value(chain,i));
1942                 if (ktmp == NULL)
1943                         {
1944                         X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
1945                         return 0;
1946                         }
1947                 if (!EVP_PKEY_missing_parameters(ktmp))
1948                         break;
1949                 else
1950                         {
1951                         EVP_PKEY_free(ktmp);
1952                         ktmp=NULL;
1953                         }
1954                 }
1955         if (ktmp == NULL)
1956                 {
1957                 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
1958                 return 0;
1959                 }
1960
1961         /* first, populate the other certs */
1962         for (j=i-1; j >= 0; j--)
1963                 {
1964                 ktmp2=X509_get_pubkey(sk_X509_value(chain,j));
1965                 EVP_PKEY_copy_parameters(ktmp2,ktmp);
1966                 EVP_PKEY_free(ktmp2);
1967                 }
1968
1969         if (pkey != NULL) EVP_PKEY_copy_parameters(pkey,ktmp);
1970         EVP_PKEY_free(ktmp);
1971         return 1;
1972         }
1973
1974 /* Make a delta CRL as the diff between two full CRLs */
1975
1976 X509_CRL *X509_CRL_diff(X509_CRL *base, X509_CRL *newer,
1977                         EVP_PKEY *skey, const EVP_MD *md, unsigned int flags)
1978         {
1979         X509_CRL *crl = NULL;
1980         int i;
1981         STACK_OF(X509_REVOKED) *revs = NULL;
1982         /* CRLs can't be delta already */
1983         if (base->base_crl_number || newer->base_crl_number)
1984                         {
1985                         X509err(X509_F_X509_CRL_DIFF, X509_R_CRL_ALREADY_DELTA);
1986                         return NULL;
1987                         }
1988         /* Base and new CRL must have a CRL number */
1989         if (!base->crl_number || !newer->crl_number)
1990                         {
1991                         X509err(X509_F_X509_CRL_DIFF, X509_R_NO_CRL_NUMBER);
1992                         return NULL;
1993                         }
1994         /* Issuer names must match */
1995         if (X509_NAME_cmp(X509_CRL_get_issuer(base),
1996                                 X509_CRL_get_issuer(newer)))
1997                         {
1998                         X509err(X509_F_X509_CRL_DIFF, X509_R_ISSUER_MISMATCH);
1999                         return NULL;
2000                         }
2001         /* AKID and IDP must match */
2002         if (!crl_extension_match(base, newer, NID_authority_key_identifier))
2003                         {
2004                         X509err(X509_F_X509_CRL_DIFF, X509_R_AKID_MISMATCH);
2005                         return NULL;
2006                         }
2007         if (!crl_extension_match(base, newer, NID_issuing_distribution_point))
2008                         {
2009                         X509err(X509_F_X509_CRL_DIFF, X509_R_IDP_MISMATCH);
2010                         return NULL;
2011                         }
2012         /* Newer CRL number must exceed full CRL number */
2013         if (ASN1_INTEGER_cmp(newer->crl_number, base->crl_number) <= 0)
2014                         {
2015                         X509err(X509_F_X509_CRL_DIFF, X509_R_NEWER_CRL_NOT_NEWER);
2016                         return NULL;
2017                         }
2018         /* CRLs must verify */
2019         if (skey && (X509_CRL_verify(base, skey) <= 0 ||
2020                         X509_CRL_verify(newer, skey) <= 0))
2021                 {
2022                 X509err(X509_F_X509_CRL_DIFF, X509_R_CRL_VERIFY_FAILURE);
2023                 return NULL;
2024                 }
2025         /* Create new CRL */
2026         crl = X509_CRL_new();
2027         if (!crl || !X509_CRL_set_version(crl, 1))
2028                 goto memerr;
2029         /* Set issuer name */
2030         if (!X509_CRL_set_issuer_name(crl, X509_CRL_get_issuer(newer)))
2031                 goto memerr;
2032
2033         if (!X509_CRL_set_lastUpdate(crl, X509_CRL_get_lastUpdate(newer)))
2034                 goto memerr;
2035         if (!X509_CRL_set_nextUpdate(crl, X509_CRL_get_nextUpdate(newer)))
2036                 goto memerr;
2037
2038         /* Set base CRL number: must be critical */
2039
2040         if (!X509_CRL_add1_ext_i2d(crl, NID_delta_crl, base->crl_number, 1, 0))
2041                 goto memerr;
2042
2043         /* Copy extensions across from newest CRL to delta: this will set
2044          * CRL number to correct value too.
2045          */
2046
2047         for (i = 0; i < X509_CRL_get_ext_count(newer); i++)
2048                 {
2049                 X509_EXTENSION *ext;
2050                 ext = X509_CRL_get_ext(newer, i);
2051                 if (!X509_CRL_add_ext(crl, ext, -1))
2052                         goto memerr;
2053                 }
2054
2055         /* Go through revoked entries, copying as needed */
2056
2057         revs = X509_CRL_get_REVOKED(newer);
2058
2059         for (i = 0; i < sk_X509_REVOKED_num(revs); i++)
2060                 {
2061                 X509_REVOKED *rvn, *rvtmp;
2062                 rvn = sk_X509_REVOKED_value(revs, i);
2063                 /* Add only if not also in base.
2064                  * TODO: need something cleverer here for some more complex
2065                  * CRLs covering multiple CAs.
2066                  */
2067                 if (!X509_CRL_get0_by_serial(base, &rvtmp, rvn->serialNumber))
2068                         {
2069                         rvtmp = X509_REVOKED_dup(rvn);
2070                         if (!rvtmp)
2071                                 goto memerr;
2072                         if (!X509_CRL_add0_revoked(crl, rvtmp))
2073                                 {
2074                                 X509_REVOKED_free(rvtmp);
2075                                 goto memerr;
2076                                 }
2077                         }
2078                 }
2079         /* TODO: optionally prune deleted entries */
2080
2081         if (skey && md && !X509_CRL_sign(crl, skey, md))
2082                 goto memerr;
2083
2084         return crl;
2085
2086         memerr:
2087         X509err(X509_F_X509_CRL_DIFF, ERR_R_MALLOC_FAILURE);
2088         if (crl)
2089                 X509_CRL_free(crl);
2090         return NULL;
2091         }
2092
2093 int X509_STORE_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
2094              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
2095         {
2096         /* This function is (usually) called only once, by
2097          * SSL_get_ex_data_X509_STORE_CTX_idx (ssl/ssl_cert.c). */
2098         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_X509_STORE_CTX, argl, argp,
2099                         new_func, dup_func, free_func);
2100         }
2101
2102 int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data)
2103         {
2104         return CRYPTO_set_ex_data(&ctx->ex_data,idx,data);
2105         }
2106
2107 void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx)
2108         {
2109         return CRYPTO_get_ex_data(&ctx->ex_data,idx);
2110         }
2111
2112 int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx)
2113         {
2114         return ctx->error;
2115         }
2116
2117 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err)
2118         {
2119         ctx->error=err;
2120         }
2121
2122 int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx)
2123         {
2124         return ctx->error_depth;
2125         }
2126
2127 X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx)
2128         {
2129         return ctx->current_cert;
2130         }
2131
2132 STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx)
2133         {
2134         return ctx->chain;
2135         }
2136
2137 STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx)
2138         {
2139         if (!ctx->chain)
2140                 return NULL;
2141         return X509_chain_up_ref(ctx->chain);
2142         }
2143
2144 X509 *X509_STORE_CTX_get0_current_issuer(X509_STORE_CTX *ctx)
2145         {
2146         return ctx->current_issuer;
2147         }
2148
2149 X509_CRL *X509_STORE_CTX_get0_current_crl(X509_STORE_CTX *ctx)
2150         {
2151         return ctx->current_crl;
2152         }
2153
2154 X509_STORE_CTX *X509_STORE_CTX_get0_parent_ctx(X509_STORE_CTX *ctx)
2155         {
2156         return ctx->parent;
2157         }
2158
2159 void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x)
2160         {
2161         ctx->cert=x;
2162         }
2163
2164 void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2165         {
2166         ctx->untrusted=sk;
2167         }
2168
2169 void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk)
2170         {
2171         ctx->crls=sk;
2172         }
2173
2174 int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose)
2175         {
2176         return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0);
2177         }
2178
2179 int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust)
2180         {
2181         return X509_STORE_CTX_purpose_inherit(ctx, 0, 0, trust);
2182         }
2183
2184 /* This function is used to set the X509_STORE_CTX purpose and trust
2185  * values. This is intended to be used when another structure has its
2186  * own trust and purpose values which (if set) will be inherited by
2187  * the ctx. If they aren't set then we will usually have a default
2188  * purpose in mind which should then be used to set the trust value.
2189  * An example of this is SSL use: an SSL structure will have its own
2190  * purpose and trust settings which the application can set: if they
2191  * aren't set then we use the default of SSL client/server.
2192  */
2193
2194 int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
2195                                 int purpose, int trust)
2196 {
2197         int idx;
2198         /* If purpose not set use default */
2199         if (!purpose) purpose = def_purpose;
2200         /* If we have a purpose then check it is valid */
2201         if (purpose)
2202                 {
2203                 X509_PURPOSE *ptmp;
2204                 idx = X509_PURPOSE_get_by_id(purpose);
2205                 if (idx == -1)
2206                         {
2207                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2208                                                 X509_R_UNKNOWN_PURPOSE_ID);
2209                         return 0;
2210                         }
2211                 ptmp = X509_PURPOSE_get0(idx);
2212                 if (ptmp->trust == X509_TRUST_DEFAULT)
2213                         {
2214                         idx = X509_PURPOSE_get_by_id(def_purpose);
2215                         if (idx == -1)
2216                                 {
2217                                 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2218                                                 X509_R_UNKNOWN_PURPOSE_ID);
2219                                 return 0;
2220                                 }
2221                         ptmp = X509_PURPOSE_get0(idx);
2222                         }
2223                 /* If trust not set then get from purpose default */
2224                 if (!trust) trust = ptmp->trust;
2225                 }
2226         if (trust)
2227                 {
2228                 idx = X509_TRUST_get_by_id(trust);
2229                 if (idx == -1)
2230                         {
2231                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2232                                                 X509_R_UNKNOWN_TRUST_ID);
2233                         return 0;
2234                         }
2235                 }
2236
2237         if (purpose && !ctx->param->purpose) ctx->param->purpose = purpose;
2238         if (trust && !ctx->param->trust) ctx->param->trust = trust;
2239         return 1;
2240 }
2241
2242 X509_STORE_CTX *X509_STORE_CTX_new(void)
2243 {
2244         X509_STORE_CTX *ctx;
2245         ctx = (X509_STORE_CTX *)OPENSSL_malloc(sizeof(X509_STORE_CTX));
2246         if (!ctx)
2247                 {
2248                 X509err(X509_F_X509_STORE_CTX_NEW,ERR_R_MALLOC_FAILURE);
2249                 return NULL;
2250                 }
2251         memset(ctx, 0, sizeof(X509_STORE_CTX));
2252         return ctx;
2253 }
2254
2255 void X509_STORE_CTX_free(X509_STORE_CTX *ctx)
2256 {
2257         X509_STORE_CTX_cleanup(ctx);
2258         OPENSSL_free(ctx);
2259 }
2260
2261 int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store, X509 *x509,
2262              STACK_OF(X509) *chain)
2263         {
2264         int ret = 1;
2265         ctx->ctx=store;
2266         ctx->current_method=0;
2267         ctx->cert=x509;
2268         ctx->untrusted=chain;
2269         ctx->crls = NULL;
2270         ctx->last_untrusted=0;
2271         ctx->other_ctx=NULL;
2272         ctx->valid=0;
2273         ctx->chain=NULL;
2274         ctx->error=0;
2275         ctx->explicit_policy=0;
2276         ctx->error_depth=0;
2277         ctx->current_cert=NULL;
2278         ctx->current_issuer=NULL;
2279         ctx->current_crl=NULL;
2280         ctx->current_crl_score=0;
2281         ctx->current_reasons=0;
2282         ctx->tree = NULL;
2283         ctx->parent = NULL;
2284
2285         ctx->param = X509_VERIFY_PARAM_new();
2286
2287         if (!ctx->param)
2288                 {
2289                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2290                 return 0;
2291                 }
2292
2293         /* Inherit callbacks and flags from X509_STORE if not set
2294          * use defaults.
2295          */
2296
2297
2298         if (store)
2299                 ret = X509_VERIFY_PARAM_inherit(ctx->param, store->param);
2300         else
2301                 ctx->param->inh_flags |= X509_VP_FLAG_DEFAULT|X509_VP_FLAG_ONCE;
2302
2303         if (store)
2304                 {
2305                 ctx->verify_cb = store->verify_cb;
2306                 ctx->cleanup = store->cleanup;
2307                 }
2308         else
2309                 ctx->cleanup = 0;
2310
2311         if (ret)
2312                 ret = X509_VERIFY_PARAM_inherit(ctx->param,
2313                                         X509_VERIFY_PARAM_lookup("default"));
2314
2315         if (ret == 0)
2316                 {
2317                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2318                 return 0;
2319                 }
2320
2321         if (store && store->check_issued)
2322                 ctx->check_issued = store->check_issued;
2323         else
2324                 ctx->check_issued = check_issued;
2325
2326         if (store && store->get_issuer)
2327                 ctx->get_issuer = store->get_issuer;
2328         else
2329                 ctx->get_issuer = X509_STORE_CTX_get1_issuer;
2330
2331         if (store && store->verify_cb)
2332                 ctx->verify_cb = store->verify_cb;
2333         else
2334                 ctx->verify_cb = null_callback;
2335
2336         if (store && store->verify)
2337                 ctx->verify = store->verify;
2338         else
2339                 ctx->verify = internal_verify;
2340
2341         if (store && store->check_revocation)
2342                 ctx->check_revocation = store->check_revocation;
2343         else
2344                 ctx->check_revocation = check_revocation;
2345
2346         if (store && store->get_crl)
2347                 ctx->get_crl = store->get_crl;
2348         else
2349                 ctx->get_crl = NULL;
2350
2351         if (store && store->check_crl)
2352                 ctx->check_crl = store->check_crl;
2353         else
2354                 ctx->check_crl = check_crl;
2355
2356         if (store && store->cert_crl)
2357                 ctx->cert_crl = store->cert_crl;
2358         else
2359                 ctx->cert_crl = cert_crl;
2360
2361         if (store && store->lookup_certs)
2362                 ctx->lookup_certs = store->lookup_certs;
2363         else
2364                 ctx->lookup_certs = X509_STORE_get1_certs;
2365
2366         if (store && store->lookup_crls)
2367                 ctx->lookup_crls = store->lookup_crls;
2368         else
2369                 ctx->lookup_crls = X509_STORE_get1_crls;
2370
2371         ctx->check_policy = check_policy;
2372
2373
2374         /* This memset() can't make any sense anyway, so it's removed. As
2375          * X509_STORE_CTX_cleanup does a proper "free" on the ex_data, we put a
2376          * corresponding "new" here and remove this bogus initialisation. */
2377         /* memset(&(ctx->ex_data),0,sizeof(CRYPTO_EX_DATA)); */
2378         if(!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx,
2379                                 &(ctx->ex_data)))
2380                 {
2381                 OPENSSL_free(ctx);
2382                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2383                 return 0;
2384                 }
2385         return 1;
2386         }
2387
2388 /* Set alternative lookup method: just a STACK of trusted certificates.
2389  * This avoids X509_STORE nastiness where it isn't needed.
2390  */
2391
2392 void X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2393 {
2394         ctx->other_ctx = sk;
2395         ctx->get_issuer = get_issuer_sk;
2396 }
2397
2398 void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx)
2399         {
2400         if (ctx->cleanup) ctx->cleanup(ctx);
2401         if (ctx->param != NULL)
2402                 {
2403                 if (ctx->parent == NULL)
2404                         X509_VERIFY_PARAM_free(ctx->param);
2405                 ctx->param=NULL;
2406                 }
2407         if (ctx->tree != NULL)
2408                 {
2409                 X509_policy_tree_free(ctx->tree);
2410                 ctx->tree=NULL;
2411                 }
2412         if (ctx->chain != NULL)
2413                 {
2414                 sk_X509_pop_free(ctx->chain,X509_free);
2415                 ctx->chain=NULL;
2416                 }
2417         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, &(ctx->ex_data));
2418         memset(&ctx->ex_data,0,sizeof(CRYPTO_EX_DATA));
2419         }
2420
2421 void X509_STORE_CTX_set_depth(X509_STORE_CTX *ctx, int depth)
2422         {
2423         X509_VERIFY_PARAM_set_depth(ctx->param, depth);
2424         }
2425
2426 void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, unsigned long flags)
2427         {
2428         X509_VERIFY_PARAM_set_flags(ctx->param, flags);
2429         }
2430
2431 void X509_STORE_CTX_set_time(X509_STORE_CTX *ctx, unsigned long flags, time_t t)
2432         {
2433         X509_VERIFY_PARAM_set_time(ctx->param, t);
2434         }
2435
2436 void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx,
2437                                   int (*verify_cb)(int, X509_STORE_CTX *))
2438         {
2439         ctx->verify_cb=verify_cb;
2440         }
2441
2442 X509_POLICY_TREE *X509_STORE_CTX_get0_policy_tree(X509_STORE_CTX *ctx)
2443         {
2444         return ctx->tree;
2445         }
2446
2447 int X509_STORE_CTX_get_explicit_policy(X509_STORE_CTX *ctx)
2448         {
2449         return ctx->explicit_policy;
2450         }
2451
2452 int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name)
2453         {
2454         const X509_VERIFY_PARAM *param;
2455         param = X509_VERIFY_PARAM_lookup(name);
2456         if (!param)
2457                 return 0;
2458         return X509_VERIFY_PARAM_inherit(ctx->param, param);
2459         }
2460
2461 X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx)
2462         {
2463         return ctx->param;
2464         }
2465
2466 void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param)
2467         {
2468         if (ctx->param)
2469                 X509_VERIFY_PARAM_free(ctx->param);
2470         ctx->param = param;
2471         }
2472
2473 IMPLEMENT_STACK_OF(X509)
2474 IMPLEMENT_ASN1_SET_OF(X509)
2475
2476 IMPLEMENT_STACK_OF(X509_NAME)
2477
2478 IMPLEMENT_STACK_OF(X509_ATTRIBUTE)
2479 IMPLEMENT_ASN1_SET_OF(X509_ATTRIBUTE)