crypto/x509/x509_vfy.c

   1 /* crypto/x509/x509_vfy.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <time.h>
  61 #include <errno.h>
  62
  63 #include "cryptlib.h"
  64 #include <openssl/crypto.h>
  65 #include <openssl/lhash.h>
  66 #include <openssl/buffer.h>
  67 #include <openssl/evp.h>
  68 #include <openssl/asn1.h>
  69 #include <openssl/x509.h>
  70 #include <openssl/x509v3.h>
  71 #include <openssl/objects.h>
  72
  73 /* CRL score values */
  74
  75 /* No unhandled critical extensions */
  76
  77 #define CRL_SCORE_NOCRITICAL    0x100
  78
  79 /* certificate is within CRL scope */
  80
  81 #define CRL_SCORE_SCOPE         0x080
  82
  83 /* CRL times valid */
  84
  85 #define CRL_SCORE_TIME          0x040
  86
  87 /* Issuer name matches certificate */
  88
  89 #define CRL_SCORE_ISSUER_NAME   0x020
  90
  91 /* If this score or above CRL is probably valid */
  92
  93 #define CRL_SCORE_VALID (CRL_SCORE_NOCRITICAL|CRL_SCORE_TIME|CRL_SCORE_SCOPE)
  94
  95 /* CRL issuer is certificate issuer */
  96
  97 #define CRL_SCORE_ISSUER_CERT   0x018
  98
  99 /* CRL issuer is on certificate path */
 100
 101 #define CRL_SCORE_SAME_PATH     0x008
 102
 103 /* CRL issuer matches CRL AKID */
 104
 105 #define CRL_SCORE_AKID          0x004
 106
 107 /* Have a delta CRL with valid times */
 108
 109 #define CRL_SCORE_TIME_DELTA    0x002
 110
 111 static int null_callback(int ok,X509_STORE_CTX *e);
 112 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer);
 113 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x);
 114 static int check_chain_extensions(X509_STORE_CTX *ctx);
 115 static int check_name_constraints(X509_STORE_CTX *ctx);
 116 static int check_id(X509_STORE_CTX *ctx);
 117 static int check_trust(X509_STORE_CTX *ctx);
 118 static int check_revocation(X509_STORE_CTX *ctx);
 119 static int check_cert(X509_STORE_CTX *ctx);
 120 static int check_policy(X509_STORE_CTX *ctx);
 121
 122 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
 123                         unsigned int *preasons,
 124                         X509_CRL *crl, X509 *x);
 125 static int get_crl_delta(X509_STORE_CTX *ctx,
 126                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x);
 127 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pcrl_score,
 128                         X509_CRL *base, STACK_OF(X509_CRL) *crls);
 129 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
 130                                 X509 **pissuer, int *pcrl_score);
 131 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
 132                                 unsigned int *preasons);
 133 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x);
 134 static int check_crl_chain(X509_STORE_CTX *ctx,
 135                         STACK_OF(X509) *cert_path,
 136                         STACK_OF(X509) *crl_path);
 137
 138 static int internal_verify(X509_STORE_CTX *ctx);
 139 const char X509_version[]="X.509" OPENSSL_VERSION_PTEXT;
 140
 141
 142 static int null_callback(int ok, X509_STORE_CTX *e)
 143         {
 144         return ok;
 145         }
 146
 147 #if 0
 148 static int x509_subject_cmp(X509 **a, X509 **b)
 149         {
 150         return X509_subject_name_cmp(*a,*b);
 151         }
 152 #endif
 153 /* Return 1 is a certificate is self signed */
 154 static int cert_self_signed(X509 *x)
 155         {
 156         X509_check_purpose(x, -1, 0);
 157         if (x->ex_flags & EXFLAG_SS)
 158                 return 1;
 159         else
 160                 return 0;
 161         }
 162
 163 /* Given a certificate try and find an exact match in the store */
 164
 165 static X509 *lookup_cert_match(X509_STORE_CTX *ctx, X509 *x)
 166         {
 167         STACK_OF(X509) *certs;
 168         X509 *xtmp = NULL;
 169         int i;
 170         /* Lookup all certs with matching subject name */
 171         certs = ctx->lookup_certs(ctx, X509_get_subject_name(x));
 172         if (certs == NULL)
 173                 return NULL;
 174         /* Look for exact match */
 175         for (i = 0; i < sk_X509_num(certs); i++)
 176                 {
 177                 xtmp = sk_X509_value(certs, i);
 178                 if (!X509_cmp(xtmp, x))
 179                         break;
 180                 }
 181         if (i < sk_X509_num(certs))
 182                 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
 183         else
 184                 xtmp = NULL;
 185         sk_X509_pop_free(certs, X509_free);
 186         return xtmp;
 187         }
 188
 189 int X509_verify_cert(X509_STORE_CTX *ctx)
 190         {
 191         X509 *x,*xtmp,*chain_ss=NULL;
 192         int bad_chain = 0;
 193         X509_VERIFY_PARAM *param = ctx->param;
 194         int depth,i,ok=0;
 195         int num;
 196         int (*cb)(int xok,X509_STORE_CTX *xctx);
 197         STACK_OF(X509) *sktmp=NULL;
 198         if (ctx->cert == NULL)
 199                 {
 200                 X509err(X509_F_X509_VERIFY_CERT,X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
 201                 return -1;
 202                 }
 203
 204         cb=ctx->verify_cb;
 205
 206         /* first we make sure the chain we are going to build is
 207          * present and that the first entry is in place */
 208         if (ctx->chain == NULL)
 209                 {
 210                 if (    ((ctx->chain=sk_X509_new_null()) == NULL) ||
 211                         (!sk_X509_push(ctx->chain,ctx->cert)))
 212                         {
 213                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 214                         goto end;
 215                         }
 216                 CRYPTO_add(&ctx->cert->references,1,CRYPTO_LOCK_X509);
 217                 ctx->last_untrusted=1;
 218                 }
 219
 220         /* We use a temporary STACK so we can chop and hack at it */
 221         if (ctx->untrusted != NULL
 222             && (sktmp=sk_X509_dup(ctx->untrusted)) == NULL)
 223                 {
 224                 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 225                 goto end;
 226                 }
 227
 228         num=sk_X509_num(ctx->chain);
 229         x=sk_X509_value(ctx->chain,num-1);
 230         depth=param->depth;
 231
 232
 233         for (;;)
 234                 {
 235                 /* If we have enough, we break */
 236                 if (depth < num) break; /* FIXME: If this happens, we should take
 237                                          * note of it and, if appropriate, use the
 238                                          * X509_V_ERR_CERT_CHAIN_TOO_LONG error
 239                                          * code later.
 240                                          */
 241
 242                 /* If we are self signed, we break */
 243                 if (cert_self_signed(x))
 244                         break;
 245                 /* If asked see if we can find issuer in trusted store first */
 246                 if (ctx->param->flags & X509_V_FLAG_TRUSTED_FIRST)
 247                         {
 248                         ok = ctx->get_issuer(&xtmp, ctx, x);
 249                         if (ok < 0)
 250                                 return ok;
 251                         /* If successful for now free up cert so it
 252                          * will be picked up again later.
 253                          */
 254                         if (ok > 0)
 255                                 {
 256                                 X509_free(xtmp);
 257                                 break;
 258                                 }
 259                         }
 260
 261                 /* If we were passed a cert chain, use it first */
 262                 if (ctx->untrusted != NULL)
 263                         {
 264                         xtmp=find_issuer(ctx, sktmp,x);
 265                         if (xtmp != NULL)
 266                                 {
 267                                 if (!sk_X509_push(ctx->chain,xtmp))
 268                                         {
 269                                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 270                                         goto end;
 271                                         }
 272                                 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
 273                                 (void)sk_X509_delete_ptr(sktmp,xtmp);
 274                                 ctx->last_untrusted++;
 275                                 x=xtmp;
 276                                 num++;
 277                                 /* reparse the full chain for
 278                                  * the next one */
 279                                 continue;
 280                                 }
 281                         }
 282                 break;
 283                 }
 284
 285         /* at this point, chain should contain a list of untrusted
 286          * certificates.  We now need to add at least one trusted one,
 287          * if possible, otherwise we complain. */
 288
 289         /* Examine last certificate in chain and see if it
 290          * is self signed.
 291          */
 292
 293         i=sk_X509_num(ctx->chain);
 294         x=sk_X509_value(ctx->chain,i-1);
 295         if (cert_self_signed(x))
 296                 {
 297                 /* we have a self signed certificate */
 298                 if (sk_X509_num(ctx->chain) == 1)
 299                         {
 300                         /* We have a single self signed certificate: see if
 301                          * we can find it in the store. We must have an exact
 302                          * match to avoid possible impersonation.
 303                          */
 304                         ok = ctx->get_issuer(&xtmp, ctx, x);
 305                         if ((ok <= 0) || X509_cmp(x, xtmp))
 306                                 {
 307                                 ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
 308                                 ctx->current_cert=x;
 309                                 ctx->error_depth=i-1;
 310                                 if (ok == 1) X509_free(xtmp);
 311                                 bad_chain = 1;
 312                                 ok=cb(0,ctx);
 313                                 if (!ok) goto end;
 314                                 }
 315                         else
 316                                 {
 317                                 /* We have a match: replace certificate with store version
 318                                  * so we get any trust settings.
 319                                  */
 320                                 X509_free(x);
 321                                 x = xtmp;
 322                                 (void)sk_X509_set(ctx->chain, i - 1, x);
 323                                 ctx->last_untrusted=0;
 324                                 }
 325                         }
 326                 else
 327                         {
 328                         /* extract and save self signed certificate for later use */
 329                         chain_ss=sk_X509_pop(ctx->chain);
 330                         ctx->last_untrusted--;
 331                         num--;
 332                         x=sk_X509_value(ctx->chain,num-1);
 333                         }
 334                 }
 335
 336         /* We now lookup certs from the certificate store */
 337         for (;;)
 338                 {
 339                 /* If we have enough, we break */
 340                 if (depth < num) break;
 341
 342                 /* If we are self signed, we break */
 343                 if (cert_self_signed(x))
 344                         break;
 345
 346                 ok = ctx->get_issuer(&xtmp, ctx, x);
 347
 348                 if (ok < 0) return ok;
 349                 if (ok == 0) break;
 350
 351                 x = xtmp;
 352                 if (!sk_X509_push(ctx->chain,x))
 353                         {
 354                         X509_free(xtmp);
 355                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 356                         return 0;
 357                         }
 358                 num++;
 359                 }
 360
 361         /* we now have our chain, lets check it... */
 362
 363         i = check_trust(ctx);
 364
 365         /* If explicitly rejected error */
 366         if (i == X509_TRUST_REJECTED)
 367                 goto end;
 368         /* If not explicitly trusted then indicate error */
 369         if (i != X509_TRUST_TRUSTED)
 370                 {
 371                 if ((chain_ss == NULL) || !ctx->check_issued(ctx, x, chain_ss))
 372                         {
 373                         if (ctx->last_untrusted >= num)
 374                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
 375                         else
 376                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
 377                         ctx->current_cert=x;
 378                         }
 379                 else
 380                         {
 381
 382                         sk_X509_push(ctx->chain,chain_ss);
 383                         num++;
 384                         ctx->last_untrusted=num;
 385                         ctx->current_cert=chain_ss;
 386                         ctx->error=X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
 387                         chain_ss=NULL;
 388                         }
 389
 390                 ctx->error_depth=num-1;
 391                 bad_chain = 1;
 392                 ok=cb(0,ctx);
 393                 if (!ok) goto end;
 394                 }
 395
 396         /* We have the chain complete: now we need to check its purpose */
 397         ok = check_chain_extensions(ctx);
 398
 399         if (!ok) goto end;
 400
 401         /* Check name constraints */
 402
 403         ok = check_name_constraints(ctx);
 404
 405         if (!ok) goto end;
 406
 407         ok = check_id(ctx);
 408
 409         if (!ok) goto end;
 410
 411         /* We may as well copy down any DSA parameters that are required */
 412         X509_get_pubkey_parameters(NULL,ctx->chain);
 413
 414         /* Check revocation status: we do this after copying parameters
 415          * because they may be needed for CRL signature verification.
 416          */
 417
 418         ok = ctx->check_revocation(ctx);
 419         if(!ok) goto end;
 420
 421         i = X509_chain_check_suiteb(&ctx->error_depth, NULL, ctx->chain,
 422                                                         ctx->param->flags);
 423         if (i != X509_V_OK)
 424                 {
 425                 ctx->error = i;
 426                 ctx->current_cert = sk_X509_value(ctx->chain, ctx->error_depth);
 427                 ok = cb(0, ctx);
 428                 if (!ok)
 429                         goto end;
 430                 }
 431
 432         /* At this point, we have a chain and need to verify it */
 433         if (ctx->verify != NULL)
 434                 ok=ctx->verify(ctx);
 435         else
 436                 ok=internal_verify(ctx);
 437         if(!ok) goto end;
 438
 439 #ifndef OPENSSL_NO_RFC3779
 440         /* RFC 3779 path validation, now that CRL check has been done */
 441         ok = v3_asid_validate_path(ctx);
 442         if (!ok) goto end;
 443         ok = v3_addr_validate_path(ctx);
 444         if (!ok) goto end;
 445 #endif
 446
 447         /* If we get this far evaluate policies */
 448         if (!bad_chain && (ctx->param->flags & X509_V_FLAG_POLICY_CHECK))
 449                 ok = ctx->check_policy(ctx);
 450         if(!ok) goto end;
 451         if (0)
 452                 {
 453 end:
 454                 X509_get_pubkey_parameters(NULL,ctx->chain);
 455                 }
 456         if (sktmp != NULL) sk_X509_free(sktmp);
 457         if (chain_ss != NULL) X509_free(chain_ss);
 458         return ok;
 459         }
 460
 461
 462 /* Given a STACK_OF(X509) find the issuer of cert (if any)
 463  */
 464
 465 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x)
 466 {
 467         int i;
 468         X509 *issuer;
 469         for (i = 0; i < sk_X509_num(sk); i++)
 470                 {
 471                 issuer = sk_X509_value(sk, i);
 472                 if (ctx->check_issued(ctx, x, issuer))
 473                         return issuer;
 474                 }
 475         return NULL;
 476 }
 477
 478 /* Given a possible certificate and issuer check them */
 479
 480 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer)
 481 {
 482         int ret;
 483         ret = X509_check_issued(issuer, x);
 484         if (ret == X509_V_OK)
 485                 {
 486                 int i;
 487                 X509 *ch;
 488                 /* Special case: single self signed certificate */
 489                 if (cert_self_signed(x) && sk_X509_num(ctx->chain) == 1)
 490                         return 1;
 491                 for (i = 0; i < sk_X509_num(ctx->chain); i++)
 492                         {
 493                         ch = sk_X509_value(ctx->chain, i);
 494                         if (ch == issuer || !X509_cmp(ch, issuer))
 495                                 {
 496                                 ret = X509_V_ERR_PATH_LOOP;
 497                                 break;
 498                                 }
 499                         }
 500                 }
 501
 502         if (ret == X509_V_OK)
 503                 return 1;
 504         /* If we haven't asked for issuer errors don't set ctx */
 505         if (!(ctx->param->flags & X509_V_FLAG_CB_ISSUER_CHECK))
 506                 return 0;
 507
 508         ctx->error = ret;
 509         ctx->current_cert = x;
 510         ctx->current_issuer = issuer;
 511         return ctx->verify_cb(0, ctx);
 512         return 0;
 513 }
 514
 515 /* Alternative lookup method: look from a STACK stored in other_ctx */
 516
 517 static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
 518 {
 519         *issuer = find_issuer(ctx, ctx->other_ctx, x);
 520         if (*issuer)
 521                 {
 522                 CRYPTO_add(&(*issuer)->references,1,CRYPTO_LOCK_X509);
 523                 return 1;
 524                 }
 525         else
 526                 return 0;
 527 }
 528
 529
 530 /* Check a certificate chains extensions for consistency
 531  * with the supplied purpose
 532  */
 533
 534 static int check_chain_extensions(X509_STORE_CTX *ctx)
 535 {
 536 #ifdef OPENSSL_NO_CHAIN_VERIFY
 537         return 1;
 538 #else
 539         int i, ok=0, must_be_ca, plen = 0;
 540         X509 *x;
 541         int (*cb)(int xok,X509_STORE_CTX *xctx);
 542         int proxy_path_length = 0;
 543         int purpose;
 544         int allow_proxy_certs;
 545         cb=ctx->verify_cb;
 546
 547         /* must_be_ca can have 1 of 3 values:
 548            -1: we accept both CA and non-CA certificates, to allow direct
 549                use of self-signed certificates (which are marked as CA).
 550            0:  we only accept non-CA certificates.  This is currently not
 551                used, but the possibility is present for future extensions.
 552            1:  we only accept CA certificates.  This is currently used for
 553                all certificates in the chain except the leaf certificate.
 554         */
 555         must_be_ca = -1;
 556
 557         /* CRL path validation */
 558         if (ctx->parent)
 559                 {
 560                 allow_proxy_certs = 0;
 561                 purpose = X509_PURPOSE_CRL_SIGN;
 562                 }
 563         else
 564                 {
 565                 allow_proxy_certs =
 566                         !!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
 567                 /* A hack to keep people who don't want to modify their
 568                    software happy */
 569                 if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
 570                         allow_proxy_certs = 1;
 571                 purpose = ctx->param->purpose;
 572                 }
 573
 574         /* Check all untrusted certificates */
 575         for (i = 0; i < ctx->last_untrusted; i++)
 576                 {
 577                 int ret;
 578                 x = sk_X509_value(ctx->chain, i);
 579                 if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
 580                         && (x->ex_flags & EXFLAG_CRITICAL))
 581                         {
 582                         ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;
 583                         ctx->error_depth = i;
 584                         ctx->current_cert = x;
 585                         ok=cb(0,ctx);
 586                         if (!ok) goto end;
 587                         }
 588                 if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY))
 589                         {
 590                         ctx->error = X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED;
 591                         ctx->error_depth = i;
 592                         ctx->current_cert = x;
 593                         ok=cb(0,ctx);
 594                         if (!ok) goto end;
 595                         }
 596                 ret = X509_check_ca(x);
 597                 switch(must_be_ca)
 598                         {
 599                 case -1:
 600                         if ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 601                                 && (ret != 1) && (ret != 0))
 602                                 {
 603                                 ret = 0;
 604                                 ctx->error = X509_V_ERR_INVALID_CA;
 605                                 }
 606                         else
 607                                 ret = 1;
 608                         break;
 609                 case 0:
 610                         if (ret != 0)
 611                                 {
 612                                 ret = 0;
 613                                 ctx->error = X509_V_ERR_INVALID_NON_CA;
 614                                 }
 615                         else
 616                                 ret = 1;
 617                         break;
 618                 default:
 619                         if ((ret == 0)
 620                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 621                                         && (ret != 1)))
 622                                 {
 623                                 ret = 0;
 624                                 ctx->error = X509_V_ERR_INVALID_CA;
 625                                 }
 626                         else
 627                                 ret = 1;
 628                         break;
 629                         }
 630                 if (ret == 0)
 631                         {
 632                         ctx->error_depth = i;
 633                         ctx->current_cert = x;
 634                         ok=cb(0,ctx);
 635                         if (!ok) goto end;
 636                         }
 637                 if (ctx->param->purpose > 0)
 638                         {
 639                         ret = X509_check_purpose(x, purpose, must_be_ca > 0);
 640                         if ((ret == 0)
 641                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 642                                         && (ret != 1)))
 643                                 {
 644                                 ctx->error = X509_V_ERR_INVALID_PURPOSE;
 645                                 ctx->error_depth = i;
 646                                 ctx->current_cert = x;
 647                                 ok=cb(0,ctx);
 648                                 if (!ok) goto end;
 649                                 }
 650                         }
 651                 /* Check pathlen if not self issued */
 652                 if ((i > 1) && !(x->ex_flags & EXFLAG_SI)
 653                            && (x->ex_pathlen != -1)
 654                            && (plen > (x->ex_pathlen + proxy_path_length + 1)))
 655                         {
 656                         ctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;
 657                         ctx->error_depth = i;
 658                         ctx->current_cert = x;
 659                         ok=cb(0,ctx);
 660                         if (!ok) goto end;
 661                         }
 662                 /* Increment path length if not self issued */
 663                 if (!(x->ex_flags & EXFLAG_SI))
 664                         plen++;
 665                 /* If this certificate is a proxy certificate, the next
 666                    certificate must be another proxy certificate or a EE
 667                    certificate.  If not, the next certificate must be a
 668                    CA certificate.  */
 669                 if (x->ex_flags & EXFLAG_PROXY)
 670                         {
 671                         if (x->ex_pcpathlen != -1 && i > x->ex_pcpathlen)
 672                                 {
 673                                 ctx->error =
 674                                         X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED;
 675                                 ctx->error_depth = i;
 676                                 ctx->current_cert = x;
 677                                 ok=cb(0,ctx);
 678                                 if (!ok) goto end;
 679                                 }
 680                         proxy_path_length++;
 681                         must_be_ca = 0;
 682                         }
 683                 else
 684                         must_be_ca = 1;
 685                 }
 686         ok = 1;
 687  end:
 688         return ok;
 689 #endif
 690 }
 691
 692 static int check_name_constraints(X509_STORE_CTX *ctx)
 693         {
 694         X509 *x;
 695         int i, j, rv;
 696         /* Check name constraints for all certificates */
 697         for (i = sk_X509_num(ctx->chain) - 1; i >= 0; i--)
 698                 {
 699                 x = sk_X509_value(ctx->chain, i);
 700                 /* Ignore self issued certs unless last in chain */
 701                 if (i && (x->ex_flags & EXFLAG_SI))
 702                         continue;
 703                 /* Check against constraints for all certificates higher in
 704                  * chain including trust anchor. Trust anchor not strictly
 705                  * speaking needed but if it includes constraints it is to be
 706                  * assumed it expects them to be obeyed.
 707                  */
 708                 for (j = sk_X509_num(ctx->chain) - 1; j > i; j--)
 709                         {
 710                         NAME_CONSTRAINTS *nc = sk_X509_value(ctx->chain, j)->nc;
 711                         if (nc)
 712                                 {
 713                                 rv = NAME_CONSTRAINTS_check(x, nc);
 714                                 if (rv != X509_V_OK)
 715                                         {
 716                                         ctx->error = rv;
 717                                         ctx->error_depth = i;
 718                                         ctx->current_cert = x;
 719                                         if (!ctx->verify_cb(0,ctx))
 720                                                 return 0;
 721                                         }
 722                                 }
 723                         }
 724                 }
 725         return 1;
 726         }
 727
 728 static int check_id_error(X509_STORE_CTX *ctx, int errcode)
 729         {
 730         ctx->error = errcode;
 731         ctx->current_cert = ctx->cert;
 732         ctx->error_depth = 0;
 733         return ctx->verify_cb(0, ctx);
 734         }
 735
 736 static int check_id(X509_STORE_CTX *ctx)
 737         {
 738         X509_VERIFY_PARAM *vpm = ctx->param;
 739         X509 *x = ctx->cert;
 740         if (vpm->host && !X509_check_host(x, vpm->host, vpm->hostlen, 0))
 741                 {
 742                 if (!check_id_error(ctx, X509_V_ERR_HOSTNAME_MISMATCH))
 743                         return 0;
 744                 }
 745         if (vpm->email && !X509_check_email(x, vpm->email, vpm->emaillen, 0))
 746                 {
 747                 if (!check_id_error(ctx, X509_V_ERR_EMAIL_MISMATCH))
 748                         return 0;
 749                 }
 750         if (vpm->ip && !X509_check_ip(x, vpm->ip, vpm->iplen, 0))
 751                 {
 752                 if (!check_id_error(ctx, X509_V_ERR_IP_ADDRESS_MISMATCH))
 753                         return 0;
 754                 }
 755         return 1;
 756         }
 757
 758 static int check_trust(X509_STORE_CTX *ctx)
 759 {
 760         int i, ok;
 761         X509 *x = NULL;
 762         int (*cb)(int xok,X509_STORE_CTX *xctx);
 763         cb=ctx->verify_cb;
 764         /* Check all trusted certificates in chain */
 765         for (i = ctx->last_untrusted; i < sk_X509_num(ctx->chain); i++)
 766                 {
 767                 x = sk_X509_value(ctx->chain, i);
 768                 ok = X509_check_trust(x, ctx->param->trust, 0);
 769                 /* If explicitly trusted return trusted */
 770                 if (ok == X509_TRUST_TRUSTED)
 771                         return X509_TRUST_TRUSTED;
 772                 /* If explicitly rejected notify callback and reject if
 773                  * not overridden.
 774                  */
 775                 if (ok == X509_TRUST_REJECTED)
 776                         {
 777                         ctx->error_depth = i;
 778                         ctx->current_cert = x;
 779                         ctx->error = X509_V_ERR_CERT_REJECTED;
 780                         ok = cb(0, ctx);
 781                         if (!ok)
 782                                 return X509_TRUST_REJECTED;
 783                         }
 784                 }
 785         /* If we accept partial chains and have at least one trusted
 786          * certificate return success.
 787          */
 788         if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN)
 789                 {
 790                 if (ctx->last_untrusted < sk_X509_num(ctx->chain))
 791                         return X509_TRUST_TRUSTED;
 792                 if (sk_X509_num(ctx->chain) == 1)
 793                         {
 794                         X509 *mx;
 795                         x = sk_X509_value(ctx->chain, 0);
 796                         mx = lookup_cert_match(ctx, x);
 797                         if (mx)
 798                                 {
 799                                 (void)sk_X509_set(ctx->chain, 0, mx);
 800                                 X509_free(x);
 801                                 ctx->last_untrusted = 0;
 802                                 return X509_TRUST_TRUSTED;
 803                                 }
 804                         }
 805                 }
 806
 807         /* If no trusted certs in chain at all return untrusted and
 808          * allow standard (no issuer cert) etc errors to be indicated.
 809          */
 810         return X509_TRUST_UNTRUSTED;
 811 }
 812
 813 static int check_revocation(X509_STORE_CTX *ctx)
 814         {
 815         int i, last, ok;
 816         if (!(ctx->param->flags & X509_V_FLAG_CRL_CHECK))
 817                 return 1;
 818         if (ctx->param->flags & X509_V_FLAG_CRL_CHECK_ALL)
 819                 last = sk_X509_num(ctx->chain) - 1;
 820         else
 821                 {
 822                 /* If checking CRL paths this isn't the EE certificate */
 823                 if (ctx->parent)
 824                         return 1;
 825                 last = 0;
 826                 }
 827         for(i = 0; i <= last; i++)
 828                 {
 829                 ctx->error_depth = i;
 830                 ok = check_cert(ctx);
 831                 if (!ok) return ok;
 832                 }
 833         return 1;
 834         }
 835
 836 static int check_cert(X509_STORE_CTX *ctx)
 837         {
 838         X509_CRL *crl = NULL, *dcrl = NULL;
 839         X509 *x;
 840         int ok, cnum;
 841         cnum = ctx->error_depth;
 842         x = sk_X509_value(ctx->chain, cnum);
 843         ctx->current_cert = x;
 844         ctx->current_issuer = NULL;
 845         ctx->current_crl_score = 0;
 846         ctx->current_reasons = 0;
 847         while (ctx->current_reasons != CRLDP_ALL_REASONS)
 848                 {
 849                 /* Try to retrieve relevant CRL */
 850                 if (ctx->get_crl)
 851                         ok = ctx->get_crl(ctx, &crl, x);
 852                 else
 853                         ok = get_crl_delta(ctx, &crl, &dcrl, x);
 854                 /* If error looking up CRL, nothing we can do except
 855                  * notify callback
 856                  */
 857                 if(!ok)
 858                         {
 859                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
 860                         ok = ctx->verify_cb(0, ctx);
 861                         goto err;
 862                         }
 863                 ctx->current_crl = crl;
 864                 ok = ctx->check_crl(ctx, crl);
 865                 if (!ok)
 866                         goto err;
 867
 868                 if (dcrl)
 869                         {
 870                         ok = ctx->check_crl(ctx, dcrl);
 871                         if (!ok)
 872                                 goto err;
 873                         ok = ctx->cert_crl(ctx, dcrl, x);
 874                         if (!ok)
 875                                 goto err;
 876                         }
 877                 else
 878                         ok = 1;
 879
 880                 /* Don't look in full CRL if delta reason is removefromCRL */
 881                 if (ok != 2)
 882                         {
 883                         ok = ctx->cert_crl(ctx, crl, x);
 884                         if (!ok)
 885                                 goto err;
 886                         }
 887
 888                 X509_CRL_free(crl);
 889                 X509_CRL_free(dcrl);
 890                 crl = NULL;
 891                 dcrl = NULL;
 892                 }
 893         err:
 894         X509_CRL_free(crl);
 895         X509_CRL_free(dcrl);
 896
 897         ctx->current_crl = NULL;
 898         return ok;
 899
 900         }
 901
 902 /* Check CRL times against values in X509_STORE_CTX */
 903
 904 static int check_crl_time(X509_STORE_CTX *ctx, X509_CRL *crl, int notify)
 905         {
 906         time_t *ptime;
 907         int i;
 908         if (notify)
 909                 ctx->current_crl = crl;
 910         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
 911                 ptime = &ctx->param->check_time;
 912         else
 913                 ptime = NULL;
 914
 915         i=X509_cmp_time(X509_CRL_get_lastUpdate(crl), ptime);
 916         if (i == 0)
 917                 {
 918                 if (!notify)
 919                         return 0;
 920                 ctx->error=X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD;
 921                 if (!ctx->verify_cb(0, ctx))
 922                         return 0;
 923                 }
 924
 925         if (i > 0)
 926                 {
 927                 if (!notify)
 928                         return 0;
 929                 ctx->error=X509_V_ERR_CRL_NOT_YET_VALID;
 930                 if (!ctx->verify_cb(0, ctx))
 931                         return 0;
 932                 }
 933
 934         if(X509_CRL_get_nextUpdate(crl))
 935                 {
 936                 i=X509_cmp_time(X509_CRL_get_nextUpdate(crl), ptime);
 937
 938                 if (i == 0)
 939                         {
 940                         if (!notify)
 941                                 return 0;
 942                         ctx->error=X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD;
 943                         if (!ctx->verify_cb(0, ctx))
 944                                 return 0;
 945                         }
 946                 /* Ignore expiry of base CRL is delta is valid */
 947                 if ((i < 0) && !(ctx->current_crl_score & CRL_SCORE_TIME_DELTA))
 948                         {
 949                         if (!notify)
 950                                 return 0;
 951                         ctx->error=X509_V_ERR_CRL_HAS_EXPIRED;
 952                         if (!ctx->verify_cb(0, ctx))
 953                                 return 0;
 954                         }
 955                 }
 956
 957         if (notify)
 958                 ctx->current_crl = NULL;
 959
 960         return 1;
 961         }
 962
 963 static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl,
 964                         X509 **pissuer, int *pscore, unsigned int *preasons,
 965                         STACK_OF(X509_CRL) *crls)
 966         {
 967         int i, crl_score, best_score = *pscore;
 968         unsigned int reasons, best_reasons = 0;
 969         X509 *x = ctx->current_cert;
 970         X509_CRL *crl, *best_crl = NULL;
 971         X509 *crl_issuer = NULL, *best_crl_issuer = NULL;
 972
 973         for (i = 0; i < sk_X509_CRL_num(crls); i++)
 974                 {
 975                 crl = sk_X509_CRL_value(crls, i);
 976                 reasons = *preasons;
 977                 crl_score = get_crl_score(ctx, &crl_issuer, &reasons, crl, x);
 978
 979                 if (crl_score > best_score)
 980                         {
 981                         best_crl = crl;
 982                         best_crl_issuer = crl_issuer;
 983                         best_score = crl_score;
 984                         best_reasons = reasons;
 985                         }
 986                 }
 987
 988         if (best_crl)
 989                 {
 990                 if (*pcrl)
 991                         X509_CRL_free(*pcrl);
 992                 *pcrl = best_crl;
 993                 *pissuer = best_crl_issuer;
 994                 *pscore = best_score;
 995                 *preasons = best_reasons;
 996                 CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509_CRL);
 997                 if (*pdcrl)
 998                         {
 999                         X509_CRL_free(*pdcrl);
1000                         *pdcrl = NULL;
1001                         }
1002                 get_delta_sk(ctx, pdcrl, pscore, best_crl, crls);
1003                 }
1004
1005         if (best_score >= CRL_SCORE_VALID)
1006                 return 1;
1007
1008         return 0;
1009         }
1010
1011 /* Compare two CRL extensions for delta checking purposes. They should be
1012  * both present or both absent. If both present all fields must be identical.
1013  */
1014
1015 static int crl_extension_match(X509_CRL *a, X509_CRL *b, int nid)
1016         {
1017         ASN1_OCTET_STRING *exta, *extb;
1018         int i;
1019         i = X509_CRL_get_ext_by_NID(a, nid, -1);
1020         if (i >= 0)
1021                 {
1022                 /* Can't have multiple occurrences */
1023                 if (X509_CRL_get_ext_by_NID(a, nid, i) != -1)
1024                         return 0;
1025                 exta = X509_EXTENSION_get_data(X509_CRL_get_ext(a, i));
1026                 }
1027         else
1028                 exta = NULL;
1029
1030         i = X509_CRL_get_ext_by_NID(b, nid, -1);
1031
1032         if (i >= 0)
1033                 {
1034
1035                 if (X509_CRL_get_ext_by_NID(b, nid, i) != -1)
1036                         return 0;
1037                 extb = X509_EXTENSION_get_data(X509_CRL_get_ext(b, i));
1038                 }
1039         else
1040                 extb = NULL;
1041
1042         if (!exta && !extb)
1043                 return 1;
1044
1045         if (!exta || !extb)
1046                 return 0;
1047
1048
1049         if (ASN1_OCTET_STRING_cmp(exta, extb))
1050                 return 0;
1051
1052         return 1;
1053         }
1054
1055 /* See if a base and delta are compatible */
1056
1057 static int check_delta_base(X509_CRL *delta, X509_CRL *base)
1058         {
1059         /* Delta CRL must be a delta */
1060         if (!delta->base_crl_number)
1061                         return 0;
1062         /* Base must have a CRL number */
1063         if (!base->crl_number)
1064                         return 0;
1065         /* Issuer names must match */
1066         if (X509_NAME_cmp(X509_CRL_get_issuer(base),
1067                                 X509_CRL_get_issuer(delta)))
1068                 return 0;
1069         /* AKID and IDP must match */
1070         if (!crl_extension_match(delta, base, NID_authority_key_identifier))
1071                         return 0;
1072         if (!crl_extension_match(delta, base, NID_issuing_distribution_point))
1073                         return 0;
1074         /* Delta CRL base number must not exceed Full CRL number. */
1075         if (ASN1_INTEGER_cmp(delta->base_crl_number, base->crl_number) > 0)
1076                         return 0;
1077         /* Delta CRL number must exceed full CRL number */
1078         if (ASN1_INTEGER_cmp(delta->crl_number, base->crl_number) > 0)
1079                         return 1;
1080         return 0;
1081         }
1082
1083 /* For a given base CRL find a delta... maybe extend to delta scoring
1084  * or retrieve a chain of deltas...
1085  */
1086
1087 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pscore,
1088                         X509_CRL *base, STACK_OF(X509_CRL) *crls)
1089         {
1090         X509_CRL *delta;
1091         int i;
1092         if (!(ctx->param->flags & X509_V_FLAG_USE_DELTAS))
1093                 return;
1094         if (!((ctx->current_cert->ex_flags | base->flags) & EXFLAG_FRESHEST))
1095                 return;
1096         for (i = 0; i < sk_X509_CRL_num(crls); i++)
1097                 {
1098                 delta = sk_X509_CRL_value(crls, i);
1099                 if (check_delta_base(delta, base))
1100                         {
1101                         if (check_crl_time(ctx, delta, 0))
1102                                 *pscore |= CRL_SCORE_TIME_DELTA;
1103                         CRYPTO_add(&delta->references, 1, CRYPTO_LOCK_X509_CRL);
1104                         *dcrl = delta;
1105                         return;
1106                         }
1107                 }
1108         *dcrl = NULL;
1109         }
1110
1111 /* For a given CRL return how suitable it is for the supplied certificate 'x'.
1112  * The return value is a mask of several criteria.
1113  * If the issuer is not the certificate issuer this is returned in *pissuer.
1114  * The reasons mask is also used to determine if the CRL is suitable: if
1115  * no new reasons the CRL is rejected, otherwise reasons is updated.
1116  */
1117
1118 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
1119                         unsigned int *preasons,
1120                         X509_CRL *crl, X509 *x)
1121         {
1122
1123         int crl_score = 0;
1124         unsigned int tmp_reasons = *preasons, crl_reasons;
1125
1126         /* First see if we can reject CRL straight away */
1127
1128         /* Invalid IDP cannot be processed */
1129         if (crl->idp_flags & IDP_INVALID)
1130                 return 0;
1131         /* Reason codes or indirect CRLs need extended CRL support */
1132         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1133                 {
1134                 if (crl->idp_flags & (IDP_INDIRECT | IDP_REASONS))
1135                         return 0;
1136                 }
1137         else if (crl->idp_flags & IDP_REASONS)
1138                 {
1139                 /* If no new reasons reject */
1140                 if (!(crl->idp_reasons & ~tmp_reasons))
1141                         return 0;
1142                 }
1143         /* Don't process deltas at this stage */
1144         else if (crl->base_crl_number)
1145                 return 0;
1146         /* If issuer name doesn't match certificate need indirect CRL */
1147         if (X509_NAME_cmp(X509_get_issuer_name(x), X509_CRL_get_issuer(crl)))
1148                 {
1149                 if (!(crl->idp_flags & IDP_INDIRECT))
1150                         return 0;
1151                 }
1152         else
1153                 crl_score |= CRL_SCORE_ISSUER_NAME;
1154
1155         if (!(crl->flags & EXFLAG_CRITICAL))
1156                 crl_score |= CRL_SCORE_NOCRITICAL;
1157
1158         /* Check expiry */
1159         if (check_crl_time(ctx, crl, 0))
1160                 crl_score |= CRL_SCORE_TIME;
1161
1162         /* Check authority key ID and locate certificate issuer */
1163         crl_akid_check(ctx, crl, pissuer, &crl_score);
1164
1165         /* If we can't locate certificate issuer at this point forget it */
1166
1167         if (!(crl_score & CRL_SCORE_AKID))
1168                 return 0;
1169
1170         /* Check cert for matching CRL distribution points */
1171
1172         if (crl_crldp_check(x, crl, crl_score, &crl_reasons))
1173                 {
1174                 /* If no new reasons reject */
1175                 if (!(crl_reasons & ~tmp_reasons))
1176                         return 0;
1177                 tmp_reasons |= crl_reasons;
1178                 crl_score |= CRL_SCORE_SCOPE;
1179                 }
1180
1181         *preasons = tmp_reasons;
1182
1183         return crl_score;
1184
1185         }
1186
1187 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
1188                                 X509 **pissuer, int *pcrl_score)
1189         {
1190         X509 *crl_issuer = NULL;
1191         X509_NAME *cnm = X509_CRL_get_issuer(crl);
1192         int cidx = ctx->error_depth;
1193         int i;
1194
1195         if (cidx != sk_X509_num(ctx->chain) - 1)
1196                 cidx++;
1197
1198         crl_issuer = sk_X509_value(ctx->chain, cidx);
1199
1200         if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1201                 {
1202                 if (*pcrl_score & CRL_SCORE_ISSUER_NAME)
1203                         {
1204                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_ISSUER_CERT;
1205                         *pissuer = crl_issuer;
1206                         return;
1207                         }
1208                 }
1209
1210         for (cidx++; cidx < sk_X509_num(ctx->chain); cidx++)
1211                 {
1212                 crl_issuer = sk_X509_value(ctx->chain, cidx);
1213                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1214                         continue;
1215                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1216                         {
1217                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_SAME_PATH;
1218                         *pissuer = crl_issuer;
1219                         return;
1220                         }
1221                 }
1222
1223         /* Anything else needs extended CRL support */
1224
1225         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1226                 return;
1227
1228         /* Otherwise the CRL issuer is not on the path. Look for it in the
1229          * set of untrusted certificates.
1230          */
1231         for (i = 0; i < sk_X509_num(ctx->untrusted); i++)
1232                 {
1233                 crl_issuer = sk_X509_value(ctx->untrusted, i);
1234                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1235                         continue;
1236                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1237                         {
1238                         *pissuer = crl_issuer;
1239                         *pcrl_score |= CRL_SCORE_AKID;
1240                         return;
1241                         }
1242                 }
1243         }
1244
1245 /* Check the path of a CRL issuer certificate. This creates a new
1246  * X509_STORE_CTX and populates it with most of the parameters from the
1247  * parent. This could be optimised somewhat since a lot of path checking
1248  * will be duplicated by the parent, but this will rarely be used in
1249  * practice.
1250  */
1251
1252 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x)
1253         {
1254         X509_STORE_CTX crl_ctx;
1255         int ret;
1256         /* Don't allow recursive CRL path validation */
1257         if (ctx->parent)
1258                 return 0;
1259         if (!X509_STORE_CTX_init(&crl_ctx, ctx->ctx, x, ctx->untrusted))
1260                 return -1;
1261
1262         crl_ctx.crls = ctx->crls;
1263         /* Copy verify params across */
1264         X509_STORE_CTX_set0_param(&crl_ctx, ctx->param);
1265
1266         crl_ctx.parent = ctx;
1267         crl_ctx.verify_cb = ctx->verify_cb;
1268
1269         /* Verify CRL issuer */
1270         ret = X509_verify_cert(&crl_ctx);
1271
1272         if (ret <= 0)
1273                 goto err;
1274
1275         /* Check chain is acceptable */
1276
1277         ret = check_crl_chain(ctx, ctx->chain, crl_ctx.chain);
1278         err:
1279         X509_STORE_CTX_cleanup(&crl_ctx);
1280         return ret;
1281         }
1282
1283 /* RFC3280 says nothing about the relationship between CRL path
1284  * and certificate path, which could lead to situations where a
1285  * certificate could be revoked or validated by a CA not authorised
1286  * to do so. RFC5280 is more strict and states that the two paths must
1287  * end in the same trust anchor, though some discussions remain...
1288  * until this is resolved we use the RFC5280 version
1289  */
1290
1291 static int check_crl_chain(X509_STORE_CTX *ctx,
1292                         STACK_OF(X509) *cert_path,
1293                         STACK_OF(X509) *crl_path)
1294         {
1295         X509 *cert_ta, *crl_ta;
1296         cert_ta = sk_X509_value(cert_path, sk_X509_num(cert_path) - 1);
1297         crl_ta = sk_X509_value(crl_path, sk_X509_num(crl_path) - 1);
1298         if (!X509_cmp(cert_ta, crl_ta))
1299                 return 1;
1300         return 0;
1301         }
1302
1303 /* Check for match between two dist point names: three separate cases.
1304  * 1. Both are relative names and compare X509_NAME types.
1305  * 2. One full, one relative. Compare X509_NAME to GENERAL_NAMES.
1306  * 3. Both are full names and compare two GENERAL_NAMES.
1307  * 4. One is NULL: automatic match.
1308  */
1309
1310
1311 static int idp_check_dp(DIST_POINT_NAME *a, DIST_POINT_NAME *b)
1312         {
1313         X509_NAME *nm = NULL;
1314         GENERAL_NAMES *gens = NULL;
1315         GENERAL_NAME *gena, *genb;
1316         int i, j;
1317         if (!a || !b)
1318                 return 1;
1319         if (a->type == 1)
1320                 {
1321                 if (!a->dpname)
1322                         return 0;
1323                 /* Case 1: two X509_NAME */
1324                 if (b->type == 1)
1325                         {
1326                         if (!b->dpname)
1327                                 return 0;
1328                         if (!X509_NAME_cmp(a->dpname, b->dpname))
1329                                 return 1;
1330                         else
1331                                 return 0;
1332                         }
1333                 /* Case 2: set name and GENERAL_NAMES appropriately */
1334                 nm = a->dpname;
1335                 gens = b->name.fullname;
1336                 }
1337         else if (b->type == 1)
1338                 {
1339                 if (!b->dpname)
1340                         return 0;
1341                 /* Case 2: set name and GENERAL_NAMES appropriately */
1342                 gens = a->name.fullname;
1343                 nm = b->dpname;
1344                 }
1345
1346         /* Handle case 2 with one GENERAL_NAMES and one X509_NAME */
1347         if (nm)
1348                 {
1349                 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++)
1350                         {
1351                         gena = sk_GENERAL_NAME_value(gens, i);
1352                         if (gena->type != GEN_DIRNAME)
1353                                 continue;
1354                         if (!X509_NAME_cmp(nm, gena->d.directoryName))
1355                                 return 1;
1356                         }
1357                 return 0;
1358                 }
1359
1360         /* Else case 3: two GENERAL_NAMES */
1361
1362         for (i = 0; i < sk_GENERAL_NAME_num(a->name.fullname); i++)
1363                 {
1364                 gena = sk_GENERAL_NAME_value(a->name.fullname, i);
1365                 for (j = 0; j < sk_GENERAL_NAME_num(b->name.fullname); j++)
1366                         {
1367                         genb = sk_GENERAL_NAME_value(b->name.fullname, j);
1368                         if (!GENERAL_NAME_cmp(gena, genb))
1369                                 return 1;
1370                         }
1371                 }
1372
1373         return 0;
1374
1375         }
1376
1377 static int crldp_check_crlissuer(DIST_POINT *dp, X509_CRL *crl, int crl_score)
1378         {
1379         int i;
1380         X509_NAME *nm = X509_CRL_get_issuer(crl);
1381         /* If no CRLissuer return is successful iff don't need a match */
1382         if (!dp->CRLissuer)
1383                 return !!(crl_score & CRL_SCORE_ISSUER_NAME);
1384         for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++)
1385                 {
1386                 GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
1387                 if (gen->type != GEN_DIRNAME)
1388                         continue;
1389                 if (!X509_NAME_cmp(gen->d.directoryName, nm))
1390                         return 1;
1391                 }
1392         return 0;
1393         }
1394
1395 /* Check CRLDP and IDP */
1396
1397 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
1398                                 unsigned int *preasons)
1399         {
1400         int i;
1401         if (crl->idp_flags & IDP_ONLYATTR)
1402                 return 0;
1403         if (x->ex_flags & EXFLAG_CA)
1404                 {
1405                 if (crl->idp_flags & IDP_ONLYUSER)
1406                         return 0;
1407                 }
1408         else
1409                 {
1410                 if (crl->idp_flags & IDP_ONLYCA)
1411                         return 0;
1412                 }
1413         *preasons = crl->idp_reasons;
1414         for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++)
1415                 {
1416                 DIST_POINT *dp = sk_DIST_POINT_value(x->crldp, i);
1417                 if (crldp_check_crlissuer(dp, crl, crl_score))
1418                         {
1419                         if (!crl->idp ||
1420                              idp_check_dp(dp->distpoint, crl->idp->distpoint))
1421                                 {
1422                                 *preasons &= dp->dp_reasons;
1423                                 return 1;
1424                                 }
1425                         }
1426                 }
1427         if ((!crl->idp || !crl->idp->distpoint) && (crl_score & CRL_SCORE_ISSUER_NAME))
1428                 return 1;
1429         return 0;
1430         }
1431
1432 /* Retrieve CRL corresponding to current certificate.
1433  * If deltas enabled try to find a delta CRL too
1434  */
1435
1436 static int get_crl_delta(X509_STORE_CTX *ctx,
1437                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)
1438         {
1439         int ok;
1440         X509 *issuer = NULL;
1441         int crl_score = 0;
1442         unsigned int reasons;
1443         X509_CRL *crl = NULL, *dcrl = NULL;
1444         STACK_OF(X509_CRL) *skcrl;
1445         X509_NAME *nm = X509_get_issuer_name(x);
1446         reasons = ctx->current_reasons;
1447         ok = get_crl_sk(ctx, &crl, &dcrl,
1448                                 &issuer, &crl_score, &reasons, ctx->crls);
1449
1450         if (ok)
1451                 goto done;
1452
1453         /* Lookup CRLs from store */
1454
1455         skcrl = ctx->lookup_crls(ctx, nm);
1456
1457         /* If no CRLs found and a near match from get_crl_sk use that */
1458         if (!skcrl && crl)
1459                 goto done;
1460
1461         get_crl_sk(ctx, &crl, &dcrl, &issuer, &crl_score, &reasons, skcrl);
1462
1463         sk_X509_CRL_pop_free(skcrl, X509_CRL_free);
1464
1465         done:
1466
1467         /* If we got any kind of CRL use it and return success */
1468         if (crl)
1469                 {
1470                 ctx->current_issuer = issuer;
1471                 ctx->current_crl_score = crl_score;
1472                 ctx->current_reasons = reasons;
1473                 *pcrl = crl;
1474                 *pdcrl = dcrl;
1475                 return 1;
1476                 }
1477
1478         return 0;
1479         }
1480
1481 /* Check CRL validity */
1482 static int check_crl(X509_STORE_CTX *ctx, X509_CRL *crl)
1483         {
1484         X509 *issuer = NULL;
1485         EVP_PKEY *ikey = NULL;
1486         int ok = 0, chnum, cnum;
1487         cnum = ctx->error_depth;
1488         chnum = sk_X509_num(ctx->chain) - 1;
1489         /* if we have an alternative CRL issuer cert use that */
1490         if (ctx->current_issuer)
1491                 issuer = ctx->current_issuer;
1492
1493         /* Else find CRL issuer: if not last certificate then issuer
1494          * is next certificate in chain.
1495          */
1496         else if (cnum < chnum)
1497                 issuer = sk_X509_value(ctx->chain, cnum + 1);
1498         else
1499                 {
1500                 issuer = sk_X509_value(ctx->chain, chnum);
1501                 /* If not self signed, can't check signature */
1502                 if(!ctx->check_issued(ctx, issuer, issuer))
1503                         {
1504                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER;
1505                         ok = ctx->verify_cb(0, ctx);
1506                         if(!ok) goto err;
1507                         }
1508                 }
1509
1510         if(issuer)
1511                 {
1512                 /* Skip most tests for deltas because they have already
1513                  * been done
1514                  */
1515                 if (!crl->base_crl_number)
1516                         {
1517                         /* Check for cRLSign bit if keyUsage present */
1518                         if ((issuer->ex_flags & EXFLAG_KUSAGE) &&
1519                                 !(issuer->ex_kusage & KU_CRL_SIGN))
1520                                 {
1521                                 ctx->error = X509_V_ERR_KEYUSAGE_NO_CRL_SIGN;
1522                                 ok = ctx->verify_cb(0, ctx);
1523                                 if(!ok) goto err;
1524                                 }
1525
1526                         if (!(ctx->current_crl_score & CRL_SCORE_SCOPE))
1527                                 {
1528                                 ctx->error = X509_V_ERR_DIFFERENT_CRL_SCOPE;
1529                                 ok = ctx->verify_cb(0, ctx);
1530                                 if(!ok) goto err;
1531                                 }
1532
1533                         if (!(ctx->current_crl_score & CRL_SCORE_SAME_PATH))
1534                                 {
1535                                 if (check_crl_path(ctx, ctx->current_issuer) <= 0)
1536                                         {
1537                                         ctx->error = X509_V_ERR_CRL_PATH_VALIDATION_ERROR;
1538                                         ok = ctx->verify_cb(0, ctx);
1539                                         if(!ok) goto err;
1540                                         }
1541                                 }
1542
1543                         if (crl->idp_flags & IDP_INVALID)
1544                                 {
1545                                 ctx->error = X509_V_ERR_INVALID_EXTENSION;
1546                                 ok = ctx->verify_cb(0, ctx);
1547                                 if(!ok) goto err;
1548                                 }
1549
1550
1551                         }
1552
1553                 if (!(ctx->current_crl_score & CRL_SCORE_TIME))
1554                         {
1555                         ok = check_crl_time(ctx, crl, 1);
1556                         if (!ok)
1557                                 goto err;
1558                         }
1559
1560                 /* Attempt to get issuer certificate public key */
1561                 ikey = X509_get_pubkey(issuer);
1562
1563                 if(!ikey)
1564                         {
1565                         ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1566                         ok = ctx->verify_cb(0, ctx);
1567                         if (!ok) goto err;
1568                         }
1569                 else
1570                         {
1571                         int rv;
1572                         rv = X509_CRL_check_suiteb(crl, ikey, ctx->param->flags);
1573                         if (rv != X509_V_OK)
1574                                 {
1575                                 ctx->error=rv;
1576                                 ok = ctx->verify_cb(0, ctx);
1577                                 if (!ok)
1578                                         goto err;
1579                                 }
1580                         /* Verify CRL signature */
1581                         if(X509_CRL_verify(crl, ikey) <= 0)
1582                                 {
1583                                 ctx->error=X509_V_ERR_CRL_SIGNATURE_FAILURE;
1584                                 ok = ctx->verify_cb(0, ctx);
1585                                 if (!ok) goto err;
1586                                 }
1587                         }
1588                 }
1589
1590         ok = 1;
1591
1592         err:
1593         EVP_PKEY_free(ikey);
1594         return ok;
1595         }
1596
1597 /* Check certificate against CRL */
1598 static int cert_crl(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x)
1599         {
1600         int ok;
1601         X509_REVOKED *rev;
1602         /* The rules changed for this... previously if a CRL contained
1603          * unhandled critical extensions it could still be used to indicate
1604          * a certificate was revoked. This has since been changed since
1605          * critical extension can change the meaning of CRL entries.
1606          */
1607         if (crl->flags & EXFLAG_CRITICAL)
1608                 {
1609                 if (ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
1610                         return 1;
1611                 ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION;
1612                 ok = ctx->verify_cb(0, ctx);
1613                 if(!ok)
1614                         return 0;
1615                 }
1616         /* Look for serial number of certificate in CRL
1617          * If found make sure reason is not removeFromCRL.
1618          */
1619         if (X509_CRL_get0_by_cert(crl, &rev, x))
1620                 {
1621                 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
1622                         return 2;
1623                 ctx->error = X509_V_ERR_CERT_REVOKED;
1624                 ok = ctx->verify_cb(0, ctx);
1625                 if (!ok)
1626                         return 0;
1627                 }
1628
1629         return 1;
1630         }
1631
1632 static int check_policy(X509_STORE_CTX *ctx)
1633         {
1634         int ret;
1635         if (ctx->parent)
1636                 return 1;
1637         ret = X509_policy_check(&ctx->tree, &ctx->explicit_policy, ctx->chain,
1638                                 ctx->param->policies, ctx->param->flags);
1639         if (ret == 0)
1640                 {
1641                 X509err(X509_F_CHECK_POLICY,ERR_R_MALLOC_FAILURE);
1642                 return 0;
1643                 }
1644         /* Invalid or inconsistent extensions */
1645         if (ret == -1)
1646                 {
1647                 /* Locate certificates with bad extensions and notify
1648                  * callback.
1649                  */
1650                 X509 *x;
1651                 int i;
1652                 for (i = 1; i < sk_X509_num(ctx->chain); i++)
1653                         {
1654                         x = sk_X509_value(ctx->chain, i);
1655                         if (!(x->ex_flags & EXFLAG_INVALID_POLICY))
1656                                 continue;
1657                         ctx->current_cert = x;
1658                         ctx->error = X509_V_ERR_INVALID_POLICY_EXTENSION;
1659                         if(!ctx->verify_cb(0, ctx))
1660                                 return 0;
1661                         }
1662                 return 1;
1663                 }
1664         if (ret == -2)
1665                 {
1666                 ctx->current_cert = NULL;
1667                 ctx->error = X509_V_ERR_NO_EXPLICIT_POLICY;
1668                 return ctx->verify_cb(0, ctx);
1669                 }
1670
1671         if (ctx->param->flags & X509_V_FLAG_NOTIFY_POLICY)
1672                 {
1673                 ctx->current_cert = NULL;
1674                 ctx->error = X509_V_OK;
1675                 if (!ctx->verify_cb(2, ctx))
1676                         return 0;
1677                 }
1678
1679         return 1;
1680         }
1681
1682 static int check_cert_time(X509_STORE_CTX *ctx, X509 *x)
1683         {
1684         time_t *ptime;
1685         int i;
1686
1687         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
1688                 ptime = &ctx->param->check_time;
1689         else
1690                 ptime = NULL;
1691
1692         i=X509_cmp_time(X509_get_notBefore(x), ptime);
1693         if (i == 0)
1694                 {
1695                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
1696                 ctx->current_cert=x;
1697                 if (!ctx->verify_cb(0, ctx))
1698                         return 0;
1699                 }
1700
1701         if (i > 0)
1702                 {
1703                 ctx->error=X509_V_ERR_CERT_NOT_YET_VALID;
1704                 ctx->current_cert=x;
1705                 if (!ctx->verify_cb(0, ctx))
1706                         return 0;
1707                 }
1708
1709         i=X509_cmp_time(X509_get_notAfter(x), ptime);
1710         if (i == 0)
1711                 {
1712                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
1713                 ctx->current_cert=x;
1714                 if (!ctx->verify_cb(0, ctx))
1715                         return 0;
1716                 }
1717
1718         if (i < 0)
1719                 {
1720                 ctx->error=X509_V_ERR_CERT_HAS_EXPIRED;
1721                 ctx->current_cert=x;
1722                 if (!ctx->verify_cb(0, ctx))
1723                         return 0;
1724                 }
1725
1726         return 1;
1727         }
1728
1729 static int internal_verify(X509_STORE_CTX *ctx)
1730         {
1731         int ok=0,n;
1732         X509 *xs,*xi;
1733         EVP_PKEY *pkey=NULL;
1734         int (*cb)(int xok,X509_STORE_CTX *xctx);
1735
1736         cb=ctx->verify_cb;
1737
1738         n=sk_X509_num(ctx->chain);
1739         ctx->error_depth=n-1;
1740         n--;
1741         xi=sk_X509_value(ctx->chain,n);
1742
1743         if (ctx->check_issued(ctx, xi, xi))
1744                 xs=xi;
1745         else
1746                 {
1747                 if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN && n == 0)
1748                         return check_cert_time(ctx, xi);
1749                 if (n <= 0)
1750                         {
1751                         ctx->error=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
1752                         ctx->current_cert=xi;
1753                         ok=cb(0,ctx);
1754                         goto end;
1755                         }
1756                 else
1757                         {
1758                         n--;
1759                         ctx->error_depth=n;
1760                         xs=sk_X509_value(ctx->chain,n);
1761                         }
1762                 }
1763
1764 /*      ctx->error=0;  not needed */
1765         while (n >= 0)
1766                 {
1767                 ctx->error_depth=n;
1768
1769                 /* Skip signature check for self signed certificates unless
1770                  * explicitly asked for. It doesn't add any security and
1771                  * just wastes time.
1772                  */
1773                 if (!xs->valid && (xs != xi || (ctx->param->flags & X509_V_FLAG_CHECK_SS_SIGNATURE)))
1774                         {
1775                         if ((pkey=X509_get_pubkey(xi)) == NULL)
1776                                 {
1777                                 ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1778                                 ctx->current_cert=xi;
1779                                 ok=(*cb)(0,ctx);
1780                                 if (!ok) goto end;
1781                                 }
1782                         else if (X509_verify(xs,pkey) <= 0)
1783                                 {
1784                                 ctx->error=X509_V_ERR_CERT_SIGNATURE_FAILURE;
1785                                 ctx->current_cert=xs;
1786                                 ok=(*cb)(0,ctx);
1787                                 if (!ok)
1788                                         {
1789                                         EVP_PKEY_free(pkey);
1790                                         goto end;
1791                                         }
1792                                 }
1793                         EVP_PKEY_free(pkey);
1794                         pkey=NULL;
1795                         }
1796
1797                 xs->valid = 1;
1798
1799                 ok = check_cert_time(ctx, xs);
1800                 if (!ok)
1801                         goto end;
1802
1803                 /* The last error (if any) is still in the error value */
1804                 ctx->current_issuer=xi;
1805                 ctx->current_cert=xs;
1806                 ok=(*cb)(1,ctx);
1807                 if (!ok) goto end;
1808
1809                 n--;
1810                 if (n >= 0)
1811                         {
1812                         xi=xs;
1813                         xs=sk_X509_value(ctx->chain,n);
1814                         }
1815                 }
1816         ok=1;
1817 end:
1818         return ok;
1819         }
1820
1821 int X509_cmp_current_time(const ASN1_TIME *ctm)
1822 {
1823         return X509_cmp_time(ctm, NULL);
1824 }
1825
1826 int X509_cmp_time(const ASN1_TIME *ctm, time_t *cmp_time)
1827         {
1828         char *str;
1829         ASN1_TIME atm;
1830         long offset;
1831         char buff1[24],buff2[24],*p;
1832         int i,j;
1833
1834         p=buff1;
1835         i=ctm->length;
1836         str=(char *)ctm->data;
1837         if (ctm->type == V_ASN1_UTCTIME)
1838                 {
1839                 if ((i < 11) || (i > 17)) return 0;
1840                 memcpy(p,str,10);
1841                 p+=10;
1842                 str+=10;
1843                 }
1844         else
1845                 {
1846                 if (i < 13) return 0;
1847                 memcpy(p,str,12);
1848                 p+=12;
1849                 str+=12;
1850                 }
1851
1852         if ((*str == 'Z') || (*str == '-') || (*str == '+'))
1853                 { *(p++)='0'; *(p++)='0'; }
1854         else
1855                 {
1856                 *(p++)= *(str++);
1857                 *(p++)= *(str++);
1858                 /* Skip any fractional seconds... */
1859                 if (*str == '.')
1860                         {
1861                         str++;
1862                         while ((*str >= '0') && (*str <= '9')) str++;
1863                         }
1864
1865                 }
1866         *(p++)='Z';
1867         *(p++)='\0';
1868
1869         if (*str == 'Z')
1870                 offset=0;
1871         else
1872                 {
1873                 if ((*str != '+') && (*str != '-'))
1874                         return 0;
1875                 offset=((str[1]-'0')*10+(str[2]-'0'))*60;
1876                 offset+=(str[3]-'0')*10+(str[4]-'0');
1877                 if (*str == '-')
1878                         offset= -offset;
1879                 }
1880         atm.type=ctm->type;
1881         atm.flags = 0;
1882         atm.length=sizeof(buff2);
1883         atm.data=(unsigned char *)buff2;
1884
1885         if (X509_time_adj(&atm, offset*60, cmp_time) == NULL)
1886                 return 0;
1887
1888         if (ctm->type == V_ASN1_UTCTIME)
1889                 {
1890                 i=(buff1[0]-'0')*10+(buff1[1]-'0');
1891                 if (i < 50) i+=100; /* cf. RFC 2459 */
1892                 j=(buff2[0]-'0')*10+(buff2[1]-'0');
1893                 if (j < 50) j+=100;
1894
1895                 if (i < j) return -1;
1896                 if (i > j) return 1;
1897                 }
1898         i=strcmp(buff1,buff2);
1899         if (i == 0) /* wait a second then return younger :-) */
1900                 return -1;
1901         else
1902                 return i;
1903         }
1904
1905 ASN1_TIME *X509_gmtime_adj(ASN1_TIME *s, long adj)
1906 {
1907         return X509_time_adj(s, adj, NULL);
1908 }
1909
1910 ASN1_TIME *X509_time_adj(ASN1_TIME *s, long offset_sec, time_t *in_tm)
1911         {
1912         return X509_time_adj_ex(s, 0, offset_sec, in_tm);
1913         }
1914
1915 ASN1_TIME *X509_time_adj_ex(ASN1_TIME *s,
1916                                 int offset_day, long offset_sec, time_t *in_tm)
1917         {
1918         time_t t;
1919
1920         if (in_tm) t = *in_tm;
1921         else time(&t);
1922
1923         if (s && !(s->flags & ASN1_STRING_FLAG_MSTRING))
1924                 {
1925                 if (s->type == V_ASN1_UTCTIME)
1926                         return ASN1_UTCTIME_adj(s,t, offset_day, offset_sec);
1927                 if (s->type == V_ASN1_GENERALIZEDTIME)
1928                         return ASN1_GENERALIZEDTIME_adj(s, t, offset_day,
1929                                                                 offset_sec);
1930                 }
1931         return ASN1_TIME_adj(s, t, offset_day, offset_sec);
1932         }
1933
1934 int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain)
1935         {
1936         EVP_PKEY *ktmp=NULL,*ktmp2;
1937         int i,j;
1938
1939         if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) return 1;
1940
1941         for (i=0; i<sk_X509_num(chain); i++)
1942                 {
1943                 ktmp=X509_get_pubkey(sk_X509_value(chain,i));
1944                 if (ktmp == NULL)
1945                         {
1946                         X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
1947                         return 0;
1948                         }
1949                 if (!EVP_PKEY_missing_parameters(ktmp))
1950                         break;
1951                 else
1952                         {
1953                         EVP_PKEY_free(ktmp);
1954                         ktmp=NULL;
1955                         }
1956                 }
1957         if (ktmp == NULL)
1958                 {
1959                 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
1960                 return 0;
1961                 }
1962
1963         /* first, populate the other certs */
1964         for (j=i-1; j >= 0; j--)
1965                 {
1966                 ktmp2=X509_get_pubkey(sk_X509_value(chain,j));
1967                 EVP_PKEY_copy_parameters(ktmp2,ktmp);
1968                 EVP_PKEY_free(ktmp2);
1969                 }
1970
1971         if (pkey != NULL) EVP_PKEY_copy_parameters(pkey,ktmp);
1972         EVP_PKEY_free(ktmp);
1973         return 1;
1974         }
1975
1976 /* Make a delta CRL as the diff between two full CRLs */
1977
1978 X509_CRL *X509_CRL_diff(X509_CRL *base, X509_CRL *newer,
1979                         EVP_PKEY *skey, const EVP_MD *md, unsigned int flags)
1980         {
1981         X509_CRL *crl = NULL;
1982         int i;
1983         STACK_OF(X509_REVOKED) *revs = NULL;
1984         /* CRLs can't be delta already */
1985         if (base->base_crl_number || newer->base_crl_number)
1986                         {
1987                         X509err(X509_F_X509_CRL_DIFF, X509_R_CRL_ALREADY_DELTA);
1988                         return NULL;
1989                         }
1990         /* Base and new CRL must have a CRL number */
1991         if (!base->crl_number || !newer->crl_number)
1992                         {
1993                         X509err(X509_F_X509_CRL_DIFF, X509_R_NO_CRL_NUMBER);
1994                         return NULL;
1995                         }
1996         /* Issuer names must match */
1997         if (X509_NAME_cmp(X509_CRL_get_issuer(base),
1998                                 X509_CRL_get_issuer(newer)))
1999                         {
2000                         X509err(X509_F_X509_CRL_DIFF, X509_R_ISSUER_MISMATCH);
2001                         return NULL;
2002                         }
2003         /* AKID and IDP must match */
2004         if (!crl_extension_match(base, newer, NID_authority_key_identifier))
2005                         {
2006                         X509err(X509_F_X509_CRL_DIFF, X509_R_AKID_MISMATCH);
2007                         return NULL;
2008                         }
2009         if (!crl_extension_match(base, newer, NID_issuing_distribution_point))
2010                         {
2011                         X509err(X509_F_X509_CRL_DIFF, X509_R_IDP_MISMATCH);
2012                         return NULL;
2013                         }
2014         /* Newer CRL number must exceed full CRL number */
2015         if (ASN1_INTEGER_cmp(newer->crl_number, base->crl_number) <= 0)
2016                         {
2017                         X509err(X509_F_X509_CRL_DIFF, X509_R_NEWER_CRL_NOT_NEWER);
2018                         return NULL;
2019                         }
2020         /* CRLs must verify */
2021         if (skey && (X509_CRL_verify(base, skey) <= 0 ||
2022                         X509_CRL_verify(newer, skey) <= 0))
2023                 {
2024                 X509err(X509_F_X509_CRL_DIFF, X509_R_CRL_VERIFY_FAILURE);
2025                 return NULL;
2026                 }
2027         /* Create new CRL */
2028         crl = X509_CRL_new();
2029         if (!crl || !X509_CRL_set_version(crl, 1))
2030                 goto memerr;
2031         /* Set issuer name */
2032         if (!X509_CRL_set_issuer_name(crl, X509_CRL_get_issuer(newer)))
2033                 goto memerr;
2034
2035         if (!X509_CRL_set_lastUpdate(crl, X509_CRL_get_lastUpdate(newer)))
2036                 goto memerr;
2037         if (!X509_CRL_set_nextUpdate(crl, X509_CRL_get_nextUpdate(newer)))
2038                 goto memerr;
2039
2040         /* Set base CRL number: must be critical */
2041
2042         if (!X509_CRL_add1_ext_i2d(crl, NID_delta_crl, base->crl_number, 1, 0))
2043                 goto memerr;
2044
2045         /* Copy extensions across from newest CRL to delta: this will set
2046          * CRL number to correct value too.
2047          */
2048
2049         for (i = 0; i < X509_CRL_get_ext_count(newer); i++)
2050                 {
2051                 X509_EXTENSION *ext;
2052                 ext = X509_CRL_get_ext(newer, i);
2053                 if (!X509_CRL_add_ext(crl, ext, -1))
2054                         goto memerr;
2055                 }
2056
2057         /* Go through revoked entries, copying as needed */
2058
2059         revs = X509_CRL_get_REVOKED(newer);
2060
2061         for (i = 0; i < sk_X509_REVOKED_num(revs); i++)
2062                 {
2063                 X509_REVOKED *rvn, *rvtmp;
2064                 rvn = sk_X509_REVOKED_value(revs, i);
2065                 /* Add only if not also in base.
2066                  * TODO: need something cleverer here for some more complex
2067                  * CRLs covering multiple CAs.
2068                  */
2069                 if (!X509_CRL_get0_by_serial(base, &rvtmp, rvn->serialNumber))
2070                         {
2071                         rvtmp = X509_REVOKED_dup(rvn);
2072                         if (!rvtmp)
2073                                 goto memerr;
2074                         if (!X509_CRL_add0_revoked(crl, rvtmp))
2075                                 {
2076                                 X509_REVOKED_free(rvtmp);
2077                                 goto memerr;
2078                                 }
2079                         }
2080                 }
2081         /* TODO: optionally prune deleted entries */
2082
2083         if (skey && md && !X509_CRL_sign(crl, skey, md))
2084                 goto memerr;
2085
2086         return crl;
2087
2088         memerr:
2089         X509err(X509_F_X509_CRL_DIFF, ERR_R_MALLOC_FAILURE);
2090         if (crl)
2091                 X509_CRL_free(crl);
2092         return NULL;
2093         }
2094
2095 int X509_STORE_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
2096              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
2097         {
2098         /* This function is (usually) called only once, by
2099          * SSL_get_ex_data_X509_STORE_CTX_idx (ssl/ssl_cert.c). */
2100         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_X509_STORE_CTX, argl, argp,
2101                         new_func, dup_func, free_func);
2102         }
2103
2104 int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data)
2105         {
2106         return CRYPTO_set_ex_data(&ctx->ex_data,idx,data);
2107         }
2108
2109 void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx)
2110         {
2111         return CRYPTO_get_ex_data(&ctx->ex_data,idx);
2112         }
2113
2114 int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx)
2115         {
2116         return ctx->error;
2117         }
2118
2119 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err)
2120         {
2121         ctx->error=err;
2122         }
2123
2124 int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx)
2125         {
2126         return ctx->error_depth;
2127         }
2128
2129 X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx)
2130         {
2131         return ctx->current_cert;
2132         }
2133
2134 STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx)
2135         {
2136         return ctx->chain;
2137         }
2138
2139 STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx)
2140         {
2141         if (!ctx->chain)
2142                 return NULL;
2143         return X509_chain_up_ref(ctx->chain);
2144         }
2145
2146 X509 *X509_STORE_CTX_get0_current_issuer(X509_STORE_CTX *ctx)
2147         {
2148         return ctx->current_issuer;
2149         }
2150
2151 X509_CRL *X509_STORE_CTX_get0_current_crl(X509_STORE_CTX *ctx)
2152         {
2153         return ctx->current_crl;
2154         }
2155
2156 X509_STORE_CTX *X509_STORE_CTX_get0_parent_ctx(X509_STORE_CTX *ctx)
2157         {
2158         return ctx->parent;
2159         }
2160
2161 void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x)
2162         {
2163         ctx->cert=x;
2164         }
2165
2166 void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2167         {
2168         ctx->untrusted=sk;
2169         }
2170
2171 void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk)
2172         {
2173         ctx->crls=sk;
2174         }
2175
2176 int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose)
2177         {
2178         return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0);
2179         }
2180
2181 int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust)
2182         {
2183         return X509_STORE_CTX_purpose_inherit(ctx, 0, 0, trust);
2184         }
2185
2186 /* This function is used to set the X509_STORE_CTX purpose and trust
2187  * values. This is intended to be used when another structure has its
2188  * own trust and purpose values which (if set) will be inherited by
2189  * the ctx. If they aren't set then we will usually have a default
2190  * purpose in mind which should then be used to set the trust value.
2191  * An example of this is SSL use: an SSL structure will have its own
2192  * purpose and trust settings which the application can set: if they
2193  * aren't set then we use the default of SSL client/server.
2194  */
2195
2196 int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
2197                                 int purpose, int trust)
2198 {
2199         int idx;
2200         /* If purpose not set use default */
2201         if (!purpose) purpose = def_purpose;
2202         /* If we have a purpose then check it is valid */
2203         if (purpose)
2204                 {
2205                 X509_PURPOSE *ptmp;
2206                 idx = X509_PURPOSE_get_by_id(purpose);
2207                 if (idx == -1)
2208                         {
2209                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2210                                                 X509_R_UNKNOWN_PURPOSE_ID);
2211                         return 0;
2212                         }
2213                 ptmp = X509_PURPOSE_get0(idx);
2214                 if (ptmp->trust == X509_TRUST_DEFAULT)
2215                         {
2216                         idx = X509_PURPOSE_get_by_id(def_purpose);
2217                         if (idx == -1)
2218                                 {
2219                                 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2220                                                 X509_R_UNKNOWN_PURPOSE_ID);
2221                                 return 0;
2222                                 }
2223                         ptmp = X509_PURPOSE_get0(idx);
2224                         }
2225                 /* If trust not set then get from purpose default */
2226                 if (!trust) trust = ptmp->trust;
2227                 }
2228         if (trust)
2229                 {
2230                 idx = X509_TRUST_get_by_id(trust);
2231                 if (idx == -1)
2232                         {
2233                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2234                                                 X509_R_UNKNOWN_TRUST_ID);
2235                         return 0;
2236                         }
2237                 }
2238
2239         if (purpose && !ctx->param->purpose) ctx->param->purpose = purpose;
2240         if (trust && !ctx->param->trust) ctx->param->trust = trust;
2241         return 1;
2242 }
2243
2244 X509_STORE_CTX *X509_STORE_CTX_new(void)
2245 {
2246         X509_STORE_CTX *ctx;
2247         ctx = (X509_STORE_CTX *)OPENSSL_malloc(sizeof(X509_STORE_CTX));
2248         if (!ctx)
2249                 {
2250                 X509err(X509_F_X509_STORE_CTX_NEW,ERR_R_MALLOC_FAILURE);
2251                 return NULL;
2252                 }
2253         memset(ctx, 0, sizeof(X509_STORE_CTX));
2254         return ctx;
2255 }
2256
2257 void X509_STORE_CTX_free(X509_STORE_CTX *ctx)
2258 {
2259         X509_STORE_CTX_cleanup(ctx);
2260         OPENSSL_free(ctx);
2261 }
2262
2263 int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store, X509 *x509,
2264              STACK_OF(X509) *chain)
2265         {
2266         int ret = 1;
2267         ctx->ctx=store;
2268         ctx->current_method=0;
2269         ctx->cert=x509;
2270         ctx->untrusted=chain;
2271         ctx->crls = NULL;
2272         ctx->last_untrusted=0;
2273         ctx->other_ctx=NULL;
2274         ctx->valid=0;
2275         ctx->chain=NULL;
2276         ctx->error=0;
2277         ctx->explicit_policy=0;
2278         ctx->error_depth=0;
2279         ctx->current_cert=NULL;
2280         ctx->current_issuer=NULL;
2281         ctx->current_crl=NULL;
2282         ctx->current_crl_score=0;
2283         ctx->current_reasons=0;
2284         ctx->tree = NULL;
2285         ctx->parent = NULL;
2286
2287         ctx->param = X509_VERIFY_PARAM_new();
2288
2289         if (!ctx->param)
2290                 {
2291                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2292                 return 0;
2293                 }
2294
2295         /* Inherit callbacks and flags from X509_STORE if not set
2296          * use defaults.
2297          */
2298
2299
2300         if (store)
2301                 ret = X509_VERIFY_PARAM_inherit(ctx->param, store->param);
2302         else
2303                 ctx->param->inh_flags |= X509_VP_FLAG_DEFAULT|X509_VP_FLAG_ONCE;
2304
2305         if (store)
2306                 {
2307                 ctx->verify_cb = store->verify_cb;
2308                 ctx->cleanup = store->cleanup;
2309                 }
2310         else
2311                 ctx->cleanup = 0;
2312
2313         if (ret)
2314                 ret = X509_VERIFY_PARAM_inherit(ctx->param,
2315                                         X509_VERIFY_PARAM_lookup("default"));
2316
2317         if (ret == 0)
2318                 {
2319                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2320                 return 0;
2321                 }
2322
2323         if (store && store->check_issued)
2324                 ctx->check_issued = store->check_issued;
2325         else
2326                 ctx->check_issued = check_issued;
2327
2328         if (store && store->get_issuer)
2329                 ctx->get_issuer = store->get_issuer;
2330         else
2331                 ctx->get_issuer = X509_STORE_CTX_get1_issuer;
2332
2333         if (store && store->verify_cb)
2334                 ctx->verify_cb = store->verify_cb;
2335         else
2336                 ctx->verify_cb = null_callback;
2337
2338         if (store && store->verify)
2339                 ctx->verify = store->verify;
2340         else
2341                 ctx->verify = internal_verify;
2342
2343         if (store && store->check_revocation)
2344                 ctx->check_revocation = store->check_revocation;
2345         else
2346                 ctx->check_revocation = check_revocation;
2347
2348         if (store && store->get_crl)
2349                 ctx->get_crl = store->get_crl;
2350         else
2351                 ctx->get_crl = NULL;
2352
2353         if (store && store->check_crl)
2354                 ctx->check_crl = store->check_crl;
2355         else
2356                 ctx->check_crl = check_crl;
2357
2358         if (store && store->cert_crl)
2359                 ctx->cert_crl = store->cert_crl;
2360         else
2361                 ctx->cert_crl = cert_crl;
2362
2363         if (store && store->lookup_certs)
2364                 ctx->lookup_certs = store->lookup_certs;
2365         else
2366                 ctx->lookup_certs = X509_STORE_get1_certs;
2367
2368         if (store && store->lookup_crls)
2369                 ctx->lookup_crls = store->lookup_crls;
2370         else
2371                 ctx->lookup_crls = X509_STORE_get1_crls;
2372
2373         ctx->check_policy = check_policy;
2374
2375
2376         /* This memset() can't make any sense anyway, so it's removed. As
2377          * X509_STORE_CTX_cleanup does a proper "free" on the ex_data, we put a
2378          * corresponding "new" here and remove this bogus initialisation. */
2379         /* memset(&(ctx->ex_data),0,sizeof(CRYPTO_EX_DATA)); */
2380         if(!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx,
2381                                 &(ctx->ex_data)))
2382                 {
2383                 OPENSSL_free(ctx);
2384                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2385                 return 0;
2386                 }
2387         return 1;
2388         }
2389
2390 /* Set alternative lookup method: just a STACK of trusted certificates.
2391  * This avoids X509_STORE nastiness where it isn't needed.
2392  */
2393
2394 void X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2395 {
2396         ctx->other_ctx = sk;
2397         ctx->get_issuer = get_issuer_sk;
2398 }
2399
2400 void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx)
2401         {
2402         if (ctx->cleanup) ctx->cleanup(ctx);
2403         if (ctx->param != NULL)
2404                 {
2405                 if (ctx->parent == NULL)
2406                         X509_VERIFY_PARAM_free(ctx->param);
2407                 ctx->param=NULL;
2408                 }
2409         if (ctx->tree != NULL)
2410                 {
2411                 X509_policy_tree_free(ctx->tree);
2412                 ctx->tree=NULL;
2413                 }
2414         if (ctx->chain != NULL)
2415                 {
2416                 sk_X509_pop_free(ctx->chain,X509_free);
2417                 ctx->chain=NULL;
2418                 }
2419         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, &(ctx->ex_data));
2420         memset(&ctx->ex_data,0,sizeof(CRYPTO_EX_DATA));
2421         }
2422
2423 void X509_STORE_CTX_set_depth(X509_STORE_CTX *ctx, int depth)
2424         {
2425         X509_VERIFY_PARAM_set_depth(ctx->param, depth);
2426         }
2427
2428 void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, unsigned long flags)
2429         {
2430         X509_VERIFY_PARAM_set_flags(ctx->param, flags);
2431         }
2432
2433 void X509_STORE_CTX_set_time(X509_STORE_CTX *ctx, unsigned long flags, time_t t)
2434         {
2435         X509_VERIFY_PARAM_set_time(ctx->param, t);
2436         }
2437
2438 void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx,
2439                                   int (*verify_cb)(int, X509_STORE_CTX *))
2440         {
2441         ctx->verify_cb=verify_cb;
2442         }
2443
2444 X509_POLICY_TREE *X509_STORE_CTX_get0_policy_tree(X509_STORE_CTX *ctx)
2445         {
2446         return ctx->tree;
2447         }
2448
2449 int X509_STORE_CTX_get_explicit_policy(X509_STORE_CTX *ctx)
2450         {
2451         return ctx->explicit_policy;
2452         }
2453
2454 int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name)
2455         {
2456         const X509_VERIFY_PARAM *param;
2457         param = X509_VERIFY_PARAM_lookup(name);
2458         if (!param)
2459                 return 0;
2460         return X509_VERIFY_PARAM_inherit(ctx->param, param);
2461         }
2462
2463 X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx)
2464         {
2465         return ctx->param;
2466         }
2467
2468 void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param)
2469         {
2470         if (ctx->param)
2471                 X509_VERIFY_PARAM_free(ctx->param);
2472         ctx->param = param;
2473         }
2474
2475 IMPLEMENT_STACK_OF(X509)
2476 IMPLEMENT_ASN1_SET_OF(X509)
2477
2478 IMPLEMENT_STACK_OF(X509_NAME)
2479
2480 IMPLEMENT_STACK_OF(X509_ATTRIBUTE)
2481 IMPLEMENT_ASN1_SET_OF(X509_ATTRIBUTE)