crypto/x509/x509_vfy.c

   1 /* crypto/x509/x509_vfy.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <time.h>
  61 #include <errno.h>
  62
  63 #include "cryptlib.h"
  64 #include <openssl/crypto.h>
  65 #include <openssl/lhash.h>
  66 #include <openssl/buffer.h>
  67 #include <openssl/evp.h>
  68 #include <openssl/asn1.h>
  69 #include <openssl/x509.h>
  70 #include <openssl/x509v3.h>
  71 #include <openssl/objects.h>
  72 #include "vpm_int.h"
  73
  74 /* CRL score values */
  75
  76 /* No unhandled critical extensions */
  77
  78 #define CRL_SCORE_NOCRITICAL    0x100
  79
  80 /* certificate is within CRL scope */
  81
  82 #define CRL_SCORE_SCOPE         0x080
  83
  84 /* CRL times valid */
  85
  86 #define CRL_SCORE_TIME          0x040
  87
  88 /* Issuer name matches certificate */
  89
  90 #define CRL_SCORE_ISSUER_NAME   0x020
  91
  92 /* If this score or above CRL is probably valid */
  93
  94 #define CRL_SCORE_VALID (CRL_SCORE_NOCRITICAL|CRL_SCORE_TIME|CRL_SCORE_SCOPE)
  95
  96 /* CRL issuer is certificate issuer */
  97
  98 #define CRL_SCORE_ISSUER_CERT   0x018
  99
 100 /* CRL issuer is on certificate path */
 101
 102 #define CRL_SCORE_SAME_PATH     0x008
 103
 104 /* CRL issuer matches CRL AKID */
 105
 106 #define CRL_SCORE_AKID          0x004
 107
 108 /* Have a delta CRL with valid times */
 109
 110 #define CRL_SCORE_TIME_DELTA    0x002
 111
 112 static int null_callback(int ok,X509_STORE_CTX *e);
 113 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer);
 114 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x);
 115 static int check_chain_extensions(X509_STORE_CTX *ctx);
 116 static int check_name_constraints(X509_STORE_CTX *ctx);
 117 static int check_id(X509_STORE_CTX *ctx);
 118 static int check_trust(X509_STORE_CTX *ctx);
 119 static int check_revocation(X509_STORE_CTX *ctx);
 120 static int check_cert(X509_STORE_CTX *ctx);
 121 static int check_policy(X509_STORE_CTX *ctx);
 122
 123 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
 124                         unsigned int *preasons,
 125                         X509_CRL *crl, X509 *x);
 126 static int get_crl_delta(X509_STORE_CTX *ctx,
 127                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x);
 128 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pcrl_score,
 129                         X509_CRL *base, STACK_OF(X509_CRL) *crls);
 130 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
 131                                 X509 **pissuer, int *pcrl_score);
 132 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
 133                                 unsigned int *preasons);
 134 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x);
 135 static int check_crl_chain(X509_STORE_CTX *ctx,
 136                         STACK_OF(X509) *cert_path,
 137                         STACK_OF(X509) *crl_path);
 138
 139 static int internal_verify(X509_STORE_CTX *ctx);
 140 const char X509_version[]="X.509" OPENSSL_VERSION_PTEXT;
 141
 142
 143 static int null_callback(int ok, X509_STORE_CTX *e)
 144         {
 145         return ok;
 146         }
 147
 148 #if 0
 149 static int x509_subject_cmp(X509 **a, X509 **b)
 150         {
 151         return X509_subject_name_cmp(*a,*b);
 152         }
 153 #endif
 154 /* Return 1 is a certificate is self signed */
 155 static int cert_self_signed(X509 *x)
 156         {
 157         X509_check_purpose(x, -1, 0);
 158         if (x->ex_flags & EXFLAG_SS)
 159                 return 1;
 160         else
 161                 return 0;
 162         }
 163
 164 /* Given a certificate try and find an exact match in the store */
 165
 166 static X509 *lookup_cert_match(X509_STORE_CTX *ctx, X509 *x)
 167         {
 168         STACK_OF(X509) *certs;
 169         X509 *xtmp = NULL;
 170         int i;
 171         /* Lookup all certs with matching subject name */
 172         certs = ctx->lookup_certs(ctx, X509_get_subject_name(x));
 173         if (certs == NULL)
 174                 return NULL;
 175         /* Look for exact match */
 176         for (i = 0; i < sk_X509_num(certs); i++)
 177                 {
 178                 xtmp = sk_X509_value(certs, i);
 179                 if (!X509_cmp(xtmp, x))
 180                         break;
 181                 }
 182         if (i < sk_X509_num(certs))
 183                 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
 184         else
 185                 xtmp = NULL;
 186         sk_X509_pop_free(certs, X509_free);
 187         return xtmp;
 188         }
 189
 190 int X509_verify_cert(X509_STORE_CTX *ctx)
 191         {
 192         X509 *x,*xtmp,*chain_ss=NULL;
 193         int bad_chain = 0;
 194         X509_VERIFY_PARAM *param = ctx->param;
 195         int depth,i,ok=0;
 196         int num;
 197         int (*cb)(int xok,X509_STORE_CTX *xctx);
 198         STACK_OF(X509) *sktmp=NULL;
 199         if (ctx->cert == NULL)
 200                 {
 201                 X509err(X509_F_X509_VERIFY_CERT,X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
 202                 return -1;
 203                 }
 204
 205         cb=ctx->verify_cb;
 206
 207         /* first we make sure the chain we are going to build is
 208          * present and that the first entry is in place */
 209         if (ctx->chain == NULL)
 210                 {
 211                 if (    ((ctx->chain=sk_X509_new_null()) == NULL) ||
 212                         (!sk_X509_push(ctx->chain,ctx->cert)))
 213                         {
 214                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 215                         goto end;
 216                         }
 217                 CRYPTO_add(&ctx->cert->references,1,CRYPTO_LOCK_X509);
 218                 ctx->last_untrusted=1;
 219                 }
 220
 221         /* We use a temporary STACK so we can chop and hack at it */
 222         if (ctx->untrusted != NULL
 223             && (sktmp=sk_X509_dup(ctx->untrusted)) == NULL)
 224                 {
 225                 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 226                 goto end;
 227                 }
 228
 229         num=sk_X509_num(ctx->chain);
 230         x=sk_X509_value(ctx->chain,num-1);
 231         depth=param->depth;
 232
 233
 234         for (;;)
 235                 {
 236                 /* If we have enough, we break */
 237                 if (depth < num) break; /* FIXME: If this happens, we should take
 238                                          * note of it and, if appropriate, use the
 239                                          * X509_V_ERR_CERT_CHAIN_TOO_LONG error
 240                                          * code later.
 241                                          */
 242
 243                 /* If we are self signed, we break */
 244                 if (cert_self_signed(x))
 245                         break;
 246                 /* If asked see if we can find issuer in trusted store first */
 247                 if (ctx->param->flags & X509_V_FLAG_TRUSTED_FIRST)
 248                         {
 249                         ok = ctx->get_issuer(&xtmp, ctx, x);
 250                         if (ok < 0)
 251                                 return ok;
 252                         /* If successful for now free up cert so it
 253                          * will be picked up again later.
 254                          */
 255                         if (ok > 0)
 256                                 {
 257                                 X509_free(xtmp);
 258                                 break;
 259                                 }
 260                         }
 261
 262                 /* If we were passed a cert chain, use it first */
 263                 if (ctx->untrusted != NULL)
 264                         {
 265                         xtmp=find_issuer(ctx, sktmp,x);
 266                         if (xtmp != NULL)
 267                                 {
 268                                 if (!sk_X509_push(ctx->chain,xtmp))
 269                                         {
 270                                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 271                                         goto end;
 272                                         }
 273                                 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
 274                                 (void)sk_X509_delete_ptr(sktmp,xtmp);
 275                                 ctx->last_untrusted++;
 276                                 x=xtmp;
 277                                 num++;
 278                                 /* reparse the full chain for
 279                                  * the next one */
 280                                 continue;
 281                                 }
 282                         }
 283                 break;
 284                 }
 285
 286         /* at this point, chain should contain a list of untrusted
 287          * certificates.  We now need to add at least one trusted one,
 288          * if possible, otherwise we complain. */
 289
 290         /* Examine last certificate in chain and see if it
 291          * is self signed.
 292          */
 293
 294         i=sk_X509_num(ctx->chain);
 295         x=sk_X509_value(ctx->chain,i-1);
 296         if (cert_self_signed(x))
 297                 {
 298                 /* we have a self signed certificate */
 299                 if (sk_X509_num(ctx->chain) == 1)
 300                         {
 301                         /* We have a single self signed certificate: see if
 302                          * we can find it in the store. We must have an exact
 303                          * match to avoid possible impersonation.
 304                          */
 305                         ok = ctx->get_issuer(&xtmp, ctx, x);
 306                         if ((ok <= 0) || X509_cmp(x, xtmp))
 307                                 {
 308                                 ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
 309                                 ctx->current_cert=x;
 310                                 ctx->error_depth=i-1;
 311                                 if (ok == 1) X509_free(xtmp);
 312                                 bad_chain = 1;
 313                                 ok=cb(0,ctx);
 314                                 if (!ok) goto end;
 315                                 }
 316                         else
 317                                 {
 318                                 /* We have a match: replace certificate with store version
 319                                  * so we get any trust settings.
 320                                  */
 321                                 X509_free(x);
 322                                 x = xtmp;
 323                                 (void)sk_X509_set(ctx->chain, i - 1, x);
 324                                 ctx->last_untrusted=0;
 325                                 }
 326                         }
 327                 else
 328                         {
 329                         /* extract and save self signed certificate for later use */
 330                         chain_ss=sk_X509_pop(ctx->chain);
 331                         ctx->last_untrusted--;
 332                         num--;
 333                         x=sk_X509_value(ctx->chain,num-1);
 334                         }
 335                 }
 336
 337         /* We now lookup certs from the certificate store */
 338         for (;;)
 339                 {
 340                 /* If we have enough, we break */
 341                 if (depth < num) break;
 342
 343                 /* If we are self signed, we break */
 344                 if (cert_self_signed(x))
 345                         break;
 346
 347                 ok = ctx->get_issuer(&xtmp, ctx, x);
 348
 349                 if (ok < 0) return ok;
 350                 if (ok == 0) break;
 351
 352                 x = xtmp;
 353                 if (!sk_X509_push(ctx->chain,x))
 354                         {
 355                         X509_free(xtmp);
 356                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 357                         return 0;
 358                         }
 359                 num++;
 360                 }
 361
 362         /* we now have our chain, lets check it... */
 363
 364         i = check_trust(ctx);
 365
 366         /* If explicitly rejected error */
 367         if (i == X509_TRUST_REJECTED)
 368                 goto end;
 369         /* If not explicitly trusted then indicate error unless it's
 370          * a single self signed certificate in which case we've indicated
 371          * an error already and set bad_chain == 1
 372          */
 373         if (i != X509_TRUST_TRUSTED && !bad_chain)
 374                 {
 375                 if ((chain_ss == NULL) || !ctx->check_issued(ctx, x, chain_ss))
 376                         {
 377                         if (ctx->last_untrusted >= num)
 378                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
 379                         else
 380                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
 381                         ctx->current_cert=x;
 382                         }
 383                 else
 384                         {
 385
 386                         sk_X509_push(ctx->chain,chain_ss);
 387                         num++;
 388                         ctx->last_untrusted=num;
 389                         ctx->current_cert=chain_ss;
 390                         ctx->error=X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
 391                         chain_ss=NULL;
 392                         }
 393
 394                 ctx->error_depth=num-1;
 395                 bad_chain = 1;
 396                 ok=cb(0,ctx);
 397                 if (!ok) goto end;
 398                 }
 399
 400         /* We have the chain complete: now we need to check its purpose */
 401         ok = check_chain_extensions(ctx);
 402
 403         if (!ok) goto end;
 404
 405         /* Check name constraints */
 406
 407         ok = check_name_constraints(ctx);
 408
 409         if (!ok) goto end;
 410
 411         ok = check_id(ctx);
 412
 413         if (!ok) goto end;
 414
 415         /* We may as well copy down any DSA parameters that are required */
 416         X509_get_pubkey_parameters(NULL,ctx->chain);
 417
 418         /* Check revocation status: we do this after copying parameters
 419          * because they may be needed for CRL signature verification.
 420          */
 421
 422         ok = ctx->check_revocation(ctx);
 423         if(!ok) goto end;
 424
 425         i = X509_chain_check_suiteb(&ctx->error_depth, NULL, ctx->chain,
 426                                                         ctx->param->flags);
 427         if (i != X509_V_OK)
 428                 {
 429                 ctx->error = i;
 430                 ctx->current_cert = sk_X509_value(ctx->chain, ctx->error_depth);
 431                 ok = cb(0, ctx);
 432                 if (!ok)
 433                         goto end;
 434                 }
 435
 436         /* At this point, we have a chain and need to verify it */
 437         if (ctx->verify != NULL)
 438                 ok=ctx->verify(ctx);
 439         else
 440                 ok=internal_verify(ctx);
 441         if(!ok) goto end;
 442
 443 #ifndef OPENSSL_NO_RFC3779
 444         /* RFC 3779 path validation, now that CRL check has been done */
 445         ok = v3_asid_validate_path(ctx);
 446         if (!ok) goto end;
 447         ok = v3_addr_validate_path(ctx);
 448         if (!ok) goto end;
 449 #endif
 450
 451         /* If we get this far evaluate policies */
 452         if (!bad_chain && (ctx->param->flags & X509_V_FLAG_POLICY_CHECK))
 453                 ok = ctx->check_policy(ctx);
 454         if(!ok) goto end;
 455         if (0)
 456                 {
 457 end:
 458                 X509_get_pubkey_parameters(NULL,ctx->chain);
 459                 }
 460         if (sktmp != NULL) sk_X509_free(sktmp);
 461         if (chain_ss != NULL) X509_free(chain_ss);
 462         return ok;
 463         }
 464
 465
 466 /* Given a STACK_OF(X509) find the issuer of cert (if any)
 467  */
 468
 469 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x)
 470 {
 471         int i;
 472         X509 *issuer;
 473         for (i = 0; i < sk_X509_num(sk); i++)
 474                 {
 475                 issuer = sk_X509_value(sk, i);
 476                 if (ctx->check_issued(ctx, x, issuer))
 477                         return issuer;
 478                 }
 479         return NULL;
 480 }
 481
 482 /* Given a possible certificate and issuer check them */
 483
 484 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer)
 485 {
 486         int ret;
 487         if (x == issuer)
 488                 return cert_self_signed(x);
 489         ret = X509_check_issued(issuer, x);
 490         if (ret == X509_V_OK)
 491                 {
 492                 int i;
 493                 X509 *ch;
 494                 /* Special case: single self signed certificate */
 495                 if (cert_self_signed(x) && sk_X509_num(ctx->chain) == 1)
 496                         return 1;
 497                 for (i = 0; i < sk_X509_num(ctx->chain); i++)
 498                         {
 499                         ch = sk_X509_value(ctx->chain, i);
 500                         if (ch == issuer || !X509_cmp(ch, issuer))
 501                                 {
 502                                 ret = X509_V_ERR_PATH_LOOP;
 503                                 break;
 504                                 }
 505                         }
 506                 }
 507
 508         if (ret == X509_V_OK)
 509                 return 1;
 510         /* If we haven't asked for issuer errors don't set ctx */
 511         if (!(ctx->param->flags & X509_V_FLAG_CB_ISSUER_CHECK))
 512                 return 0;
 513
 514         ctx->error = ret;
 515         ctx->current_cert = x;
 516         ctx->current_issuer = issuer;
 517         return ctx->verify_cb(0, ctx);
 518         return 0;
 519 }
 520
 521 /* Alternative lookup method: look from a STACK stored in other_ctx */
 522
 523 static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
 524 {
 525         *issuer = find_issuer(ctx, ctx->other_ctx, x);
 526         if (*issuer)
 527                 {
 528                 CRYPTO_add(&(*issuer)->references,1,CRYPTO_LOCK_X509);
 529                 return 1;
 530                 }
 531         else
 532                 return 0;
 533 }
 534
 535
 536 /* Check a certificate chains extensions for consistency
 537  * with the supplied purpose
 538  */
 539
 540 static int check_chain_extensions(X509_STORE_CTX *ctx)
 541 {
 542 #ifdef OPENSSL_NO_CHAIN_VERIFY
 543         return 1;
 544 #else
 545         int i, ok=0, must_be_ca, plen = 0;
 546         X509 *x;
 547         int (*cb)(int xok,X509_STORE_CTX *xctx);
 548         int proxy_path_length = 0;
 549         int purpose;
 550         int allow_proxy_certs;
 551         cb=ctx->verify_cb;
 552
 553         /* must_be_ca can have 1 of 3 values:
 554            -1: we accept both CA and non-CA certificates, to allow direct
 555                use of self-signed certificates (which are marked as CA).
 556            0:  we only accept non-CA certificates.  This is currently not
 557                used, but the possibility is present for future extensions.
 558            1:  we only accept CA certificates.  This is currently used for
 559                all certificates in the chain except the leaf certificate.
 560         */
 561         must_be_ca = -1;
 562
 563         /* CRL path validation */
 564         if (ctx->parent)
 565                 {
 566                 allow_proxy_certs = 0;
 567                 purpose = X509_PURPOSE_CRL_SIGN;
 568                 }
 569         else
 570                 {
 571                 allow_proxy_certs =
 572                         !!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
 573                 /* A hack to keep people who don't want to modify their
 574                    software happy */
 575                 if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
 576                         allow_proxy_certs = 1;
 577                 purpose = ctx->param->purpose;
 578                 }
 579
 580         /* Check all untrusted certificates */
 581         for (i = 0; i < ctx->last_untrusted; i++)
 582                 {
 583                 int ret;
 584                 x = sk_X509_value(ctx->chain, i);
 585                 if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
 586                         && (x->ex_flags & EXFLAG_CRITICAL))
 587                         {
 588                         ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;
 589                         ctx->error_depth = i;
 590                         ctx->current_cert = x;
 591                         ok=cb(0,ctx);
 592                         if (!ok) goto end;
 593                         }
 594                 if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY))
 595                         {
 596                         ctx->error = X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED;
 597                         ctx->error_depth = i;
 598                         ctx->current_cert = x;
 599                         ok=cb(0,ctx);
 600                         if (!ok) goto end;
 601                         }
 602                 ret = X509_check_ca(x);
 603                 switch(must_be_ca)
 604                         {
 605                 case -1:
 606                         if ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 607                                 && (ret != 1) && (ret != 0))
 608                                 {
 609                                 ret = 0;
 610                                 ctx->error = X509_V_ERR_INVALID_CA;
 611                                 }
 612                         else
 613                                 ret = 1;
 614                         break;
 615                 case 0:
 616                         if (ret != 0)
 617                                 {
 618                                 ret = 0;
 619                                 ctx->error = X509_V_ERR_INVALID_NON_CA;
 620                                 }
 621                         else
 622                                 ret = 1;
 623                         break;
 624                 default:
 625                         if ((ret == 0)
 626                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 627                                         && (ret != 1)))
 628                                 {
 629                                 ret = 0;
 630                                 ctx->error = X509_V_ERR_INVALID_CA;
 631                                 }
 632                         else
 633                                 ret = 1;
 634                         break;
 635                         }
 636                 if (ret == 0)
 637                         {
 638                         ctx->error_depth = i;
 639                         ctx->current_cert = x;
 640                         ok=cb(0,ctx);
 641                         if (!ok) goto end;
 642                         }
 643                 if (ctx->param->purpose > 0)
 644                         {
 645                         ret = X509_check_purpose(x, purpose, must_be_ca > 0);
 646                         if ((ret == 0)
 647                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 648                                         && (ret != 1)))
 649                                 {
 650                                 ctx->error = X509_V_ERR_INVALID_PURPOSE;
 651                                 ctx->error_depth = i;
 652                                 ctx->current_cert = x;
 653                                 ok=cb(0,ctx);
 654                                 if (!ok) goto end;
 655                                 }
 656                         }
 657                 /* Check pathlen if not self issued */
 658                 if ((i > 1) && !(x->ex_flags & EXFLAG_SI)
 659                            && (x->ex_pathlen != -1)
 660                            && (plen > (x->ex_pathlen + proxy_path_length + 1)))
 661                         {
 662                         ctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;
 663                         ctx->error_depth = i;
 664                         ctx->current_cert = x;
 665                         ok=cb(0,ctx);
 666                         if (!ok) goto end;
 667                         }
 668                 /* Increment path length if not self issued */
 669                 if (!(x->ex_flags & EXFLAG_SI))
 670                         plen++;
 671                 /* If this certificate is a proxy certificate, the next
 672                    certificate must be another proxy certificate or a EE
 673                    certificate.  If not, the next certificate must be a
 674                    CA certificate.  */
 675                 if (x->ex_flags & EXFLAG_PROXY)
 676                         {
 677                         if (x->ex_pcpathlen != -1 && i > x->ex_pcpathlen)
 678                                 {
 679                                 ctx->error =
 680                                         X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED;
 681                                 ctx->error_depth = i;
 682                                 ctx->current_cert = x;
 683                                 ok=cb(0,ctx);
 684                                 if (!ok) goto end;
 685                                 }
 686                         proxy_path_length++;
 687                         must_be_ca = 0;
 688                         }
 689                 else
 690                         must_be_ca = 1;
 691                 }
 692         ok = 1;
 693  end:
 694         return ok;
 695 #endif
 696 }
 697
 698 static int check_name_constraints(X509_STORE_CTX *ctx)
 699         {
 700         X509 *x;
 701         int i, j, rv;
 702         /* Check name constraints for all certificates */
 703         for (i = sk_X509_num(ctx->chain) - 1; i >= 0; i--)
 704                 {
 705                 x = sk_X509_value(ctx->chain, i);
 706                 /* Ignore self issued certs unless last in chain */
 707                 if (i && (x->ex_flags & EXFLAG_SI))
 708                         continue;
 709                 /* Check against constraints for all certificates higher in
 710                  * chain including trust anchor. Trust anchor not strictly
 711                  * speaking needed but if it includes constraints it is to be
 712                  * assumed it expects them to be obeyed.
 713                  */
 714                 for (j = sk_X509_num(ctx->chain) - 1; j > i; j--)
 715                         {
 716                         NAME_CONSTRAINTS *nc = sk_X509_value(ctx->chain, j)->nc;
 717                         if (nc)
 718                                 {
 719                                 rv = NAME_CONSTRAINTS_check(x, nc);
 720                                 if (rv != X509_V_OK)
 721                                         {
 722                                         ctx->error = rv;
 723                                         ctx->error_depth = i;
 724                                         ctx->current_cert = x;
 725                                         if (!ctx->verify_cb(0,ctx))
 726                                                 return 0;
 727                                         }
 728                                 }
 729                         }
 730                 }
 731         return 1;
 732         }
 733
 734 static int check_id_error(X509_STORE_CTX *ctx, int errcode)
 735         {
 736         ctx->error = errcode;
 737         ctx->current_cert = ctx->cert;
 738         ctx->error_depth = 0;
 739         return ctx->verify_cb(0, ctx);
 740         }
 741
 742 static int check_id(X509_STORE_CTX *ctx)
 743         {
 744         X509_VERIFY_PARAM *vpm = ctx->param;
 745         X509_VERIFY_PARAM_ID *id = vpm->id;
 746         X509 *x = ctx->cert;
 747         if (id->host && !X509_check_host(x, id->host, id->hostlen, 0))
 748                 {
 749                 if (!check_id_error(ctx, X509_V_ERR_HOSTNAME_MISMATCH))
 750                         return 0;
 751                 }
 752         if (id->email && !X509_check_email(x, id->email, id->emaillen, 0))
 753                 {
 754                 if (!check_id_error(ctx, X509_V_ERR_EMAIL_MISMATCH))
 755                         return 0;
 756                 }
 757         if (id->ip && !X509_check_ip(x, id->ip, id->iplen, 0))
 758                 {
 759                 if (!check_id_error(ctx, X509_V_ERR_IP_ADDRESS_MISMATCH))
 760                         return 0;
 761                 }
 762         return 1;
 763         }
 764
 765 static int check_trust(X509_STORE_CTX *ctx)
 766 {
 767         int i, ok;
 768         X509 *x = NULL;
 769         int (*cb)(int xok,X509_STORE_CTX *xctx);
 770         cb=ctx->verify_cb;
 771         /* Check all trusted certificates in chain */
 772         for (i = ctx->last_untrusted; i < sk_X509_num(ctx->chain); i++)
 773                 {
 774                 x = sk_X509_value(ctx->chain, i);
 775                 ok = X509_check_trust(x, ctx->param->trust, 0);
 776                 /* If explicitly trusted return trusted */
 777                 if (ok == X509_TRUST_TRUSTED)
 778                         return X509_TRUST_TRUSTED;
 779                 /* If explicitly rejected notify callback and reject if
 780                  * not overridden.
 781                  */
 782                 if (ok == X509_TRUST_REJECTED)
 783                         {
 784                         ctx->error_depth = i;
 785                         ctx->current_cert = x;
 786                         ctx->error = X509_V_ERR_CERT_REJECTED;
 787                         ok = cb(0, ctx);
 788                         if (!ok)
 789                                 return X509_TRUST_REJECTED;
 790                         }
 791                 }
 792         /* If we accept partial chains and have at least one trusted
 793          * certificate return success.
 794          */
 795         if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN)
 796                 {
 797                 X509 *mx;
 798                 if (ctx->last_untrusted < sk_X509_num(ctx->chain))
 799                         return X509_TRUST_TRUSTED;
 800                 x = sk_X509_value(ctx->chain, 0);
 801                 mx = lookup_cert_match(ctx, x);
 802                 if (mx)
 803                         {
 804                         (void)sk_X509_set(ctx->chain, 0, mx);
 805                         X509_free(x);
 806                         ctx->last_untrusted = 0;
 807                         return X509_TRUST_TRUSTED;
 808                         }
 809                 }
 810
 811         /* If no trusted certs in chain at all return untrusted and
 812          * allow standard (no issuer cert) etc errors to be indicated.
 813          */
 814         return X509_TRUST_UNTRUSTED;
 815 }
 816
 817 static int check_revocation(X509_STORE_CTX *ctx)
 818         {
 819         int i, last, ok;
 820         if (!(ctx->param->flags & X509_V_FLAG_CRL_CHECK))
 821                 return 1;
 822         if (ctx->param->flags & X509_V_FLAG_CRL_CHECK_ALL)
 823                 last = sk_X509_num(ctx->chain) - 1;
 824         else
 825                 {
 826                 /* If checking CRL paths this isn't the EE certificate */
 827                 if (ctx->parent)
 828                         return 1;
 829                 last = 0;
 830                 }
 831         for(i = 0; i <= last; i++)
 832                 {
 833                 ctx->error_depth = i;
 834                 ok = check_cert(ctx);
 835                 if (!ok) return ok;
 836                 }
 837         return 1;
 838         }
 839
 840 static int check_cert(X509_STORE_CTX *ctx)
 841         {
 842         X509_CRL *crl = NULL, *dcrl = NULL;
 843         X509 *x;
 844         int ok, cnum;
 845         unsigned int last_reasons;
 846         cnum = ctx->error_depth;
 847         x = sk_X509_value(ctx->chain, cnum);
 848         ctx->current_cert = x;
 849         ctx->current_issuer = NULL;
 850         ctx->current_crl_score = 0;
 851         ctx->current_reasons = 0;
 852         while (ctx->current_reasons != CRLDP_ALL_REASONS)
 853                 {
 854                 last_reasons = ctx->current_reasons;
 855                 /* Try to retrieve relevant CRL */
 856                 if (ctx->get_crl)
 857                         ok = ctx->get_crl(ctx, &crl, x);
 858                 else
 859                         ok = get_crl_delta(ctx, &crl, &dcrl, x);
 860                 /* If error looking up CRL, nothing we can do except
 861                  * notify callback
 862                  */
 863                 if(!ok)
 864                         {
 865                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
 866                         ok = ctx->verify_cb(0, ctx);
 867                         goto err;
 868                         }
 869                 ctx->current_crl = crl;
 870                 ok = ctx->check_crl(ctx, crl);
 871                 if (!ok)
 872                         goto err;
 873
 874                 if (dcrl)
 875                         {
 876                         ok = ctx->check_crl(ctx, dcrl);
 877                         if (!ok)
 878                                 goto err;
 879                         ok = ctx->cert_crl(ctx, dcrl, x);
 880                         if (!ok)
 881                                 goto err;
 882                         }
 883                 else
 884                         ok = 1;
 885
 886                 /* Don't look in full CRL if delta reason is removefromCRL */
 887                 if (ok != 2)
 888                         {
 889                         ok = ctx->cert_crl(ctx, crl, x);
 890                         if (!ok)
 891                                 goto err;
 892                         }
 893
 894                 X509_CRL_free(crl);
 895                 X509_CRL_free(dcrl);
 896                 crl = NULL;
 897                 dcrl = NULL;
 898                 /* If reasons not updated we wont get anywhere by
 899                  * another iteration, so exit loop.
 900                  */
 901                 if (last_reasons == ctx->current_reasons)
 902                         {
 903                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
 904                         ok = ctx->verify_cb(0, ctx);
 905                         goto err;
 906                         }
 907                 }
 908         err:
 909         X509_CRL_free(crl);
 910         X509_CRL_free(dcrl);
 911
 912         ctx->current_crl = NULL;
 913         return ok;
 914
 915         }
 916
 917 /* Check CRL times against values in X509_STORE_CTX */
 918
 919 static int check_crl_time(X509_STORE_CTX *ctx, X509_CRL *crl, int notify)
 920         {
 921         time_t *ptime;
 922         int i;
 923         if (notify)
 924                 ctx->current_crl = crl;
 925         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
 926                 ptime = &ctx->param->check_time;
 927         else
 928                 ptime = NULL;
 929
 930         i=X509_cmp_time(X509_CRL_get_lastUpdate(crl), ptime);
 931         if (i == 0)
 932                 {
 933                 if (!notify)
 934                         return 0;
 935                 ctx->error=X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD;
 936                 if (!ctx->verify_cb(0, ctx))
 937                         return 0;
 938                 }
 939
 940         if (i > 0)
 941                 {
 942                 if (!notify)
 943                         return 0;
 944                 ctx->error=X509_V_ERR_CRL_NOT_YET_VALID;
 945                 if (!ctx->verify_cb(0, ctx))
 946                         return 0;
 947                 }
 948
 949         if(X509_CRL_get_nextUpdate(crl))
 950                 {
 951                 i=X509_cmp_time(X509_CRL_get_nextUpdate(crl), ptime);
 952
 953                 if (i == 0)
 954                         {
 955                         if (!notify)
 956                                 return 0;
 957                         ctx->error=X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD;
 958                         if (!ctx->verify_cb(0, ctx))
 959                                 return 0;
 960                         }
 961                 /* Ignore expiry of base CRL is delta is valid */
 962                 if ((i < 0) && !(ctx->current_crl_score & CRL_SCORE_TIME_DELTA))
 963                         {
 964                         if (!notify)
 965                                 return 0;
 966                         ctx->error=X509_V_ERR_CRL_HAS_EXPIRED;
 967                         if (!ctx->verify_cb(0, ctx))
 968                                 return 0;
 969                         }
 970                 }
 971
 972         if (notify)
 973                 ctx->current_crl = NULL;
 974
 975         return 1;
 976         }
 977
 978 static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl,
 979                         X509 **pissuer, int *pscore, unsigned int *preasons,
 980                         STACK_OF(X509_CRL) *crls)
 981         {
 982         int i, crl_score, best_score = *pscore;
 983         unsigned int reasons, best_reasons = 0;
 984         X509 *x = ctx->current_cert;
 985         X509_CRL *crl, *best_crl = NULL;
 986         X509 *crl_issuer = NULL, *best_crl_issuer = NULL;
 987
 988         for (i = 0; i < sk_X509_CRL_num(crls); i++)
 989                 {
 990                 crl = sk_X509_CRL_value(crls, i);
 991                 reasons = *preasons;
 992                 crl_score = get_crl_score(ctx, &crl_issuer, &reasons, crl, x);
 993
 994                 if (crl_score > best_score)
 995                         {
 996                         best_crl = crl;
 997                         best_crl_issuer = crl_issuer;
 998                         best_score = crl_score;
 999                         best_reasons = reasons;
1000                         }
1001                 }
1002
1003         if (best_crl)
1004                 {
1005                 if (*pcrl)
1006                         X509_CRL_free(*pcrl);
1007                 *pcrl = best_crl;
1008                 *pissuer = best_crl_issuer;
1009                 *pscore = best_score;
1010                 *preasons = best_reasons;
1011                 CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509_CRL);
1012                 if (*pdcrl)
1013                         {
1014                         X509_CRL_free(*pdcrl);
1015                         *pdcrl = NULL;
1016                         }
1017                 get_delta_sk(ctx, pdcrl, pscore, best_crl, crls);
1018                 }
1019
1020         if (best_score >= CRL_SCORE_VALID)
1021                 return 1;
1022
1023         return 0;
1024         }
1025
1026 /* Compare two CRL extensions for delta checking purposes. They should be
1027  * both present or both absent. If both present all fields must be identical.
1028  */
1029
1030 static int crl_extension_match(X509_CRL *a, X509_CRL *b, int nid)
1031         {
1032         ASN1_OCTET_STRING *exta, *extb;
1033         int i;
1034         i = X509_CRL_get_ext_by_NID(a, nid, -1);
1035         if (i >= 0)
1036                 {
1037                 /* Can't have multiple occurrences */
1038                 if (X509_CRL_get_ext_by_NID(a, nid, i) != -1)
1039                         return 0;
1040                 exta = X509_EXTENSION_get_data(X509_CRL_get_ext(a, i));
1041                 }
1042         else
1043                 exta = NULL;
1044
1045         i = X509_CRL_get_ext_by_NID(b, nid, -1);
1046
1047         if (i >= 0)
1048                 {
1049
1050                 if (X509_CRL_get_ext_by_NID(b, nid, i) != -1)
1051                         return 0;
1052                 extb = X509_EXTENSION_get_data(X509_CRL_get_ext(b, i));
1053                 }
1054         else
1055                 extb = NULL;
1056
1057         if (!exta && !extb)
1058                 return 1;
1059
1060         if (!exta || !extb)
1061                 return 0;
1062
1063
1064         if (ASN1_OCTET_STRING_cmp(exta, extb))
1065                 return 0;
1066
1067         return 1;
1068         }
1069
1070 /* See if a base and delta are compatible */
1071
1072 static int check_delta_base(X509_CRL *delta, X509_CRL *base)
1073         {
1074         /* Delta CRL must be a delta */
1075         if (!delta->base_crl_number)
1076                         return 0;
1077         /* Base must have a CRL number */
1078         if (!base->crl_number)
1079                         return 0;
1080         /* Issuer names must match */
1081         if (X509_NAME_cmp(X509_CRL_get_issuer(base),
1082                                 X509_CRL_get_issuer(delta)))
1083                 return 0;
1084         /* AKID and IDP must match */
1085         if (!crl_extension_match(delta, base, NID_authority_key_identifier))
1086                         return 0;
1087         if (!crl_extension_match(delta, base, NID_issuing_distribution_point))
1088                         return 0;
1089         /* Delta CRL base number must not exceed Full CRL number. */
1090         if (ASN1_INTEGER_cmp(delta->base_crl_number, base->crl_number) > 0)
1091                         return 0;
1092         /* Delta CRL number must exceed full CRL number */
1093         if (ASN1_INTEGER_cmp(delta->crl_number, base->crl_number) > 0)
1094                         return 1;
1095         return 0;
1096         }
1097
1098 /* For a given base CRL find a delta... maybe extend to delta scoring
1099  * or retrieve a chain of deltas...
1100  */
1101
1102 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pscore,
1103                         X509_CRL *base, STACK_OF(X509_CRL) *crls)
1104         {
1105         X509_CRL *delta;
1106         int i;
1107         if (!(ctx->param->flags & X509_V_FLAG_USE_DELTAS))
1108                 return;
1109         if (!((ctx->current_cert->ex_flags | base->flags) & EXFLAG_FRESHEST))
1110                 return;
1111         for (i = 0; i < sk_X509_CRL_num(crls); i++)
1112                 {
1113                 delta = sk_X509_CRL_value(crls, i);
1114                 if (check_delta_base(delta, base))
1115                         {
1116                         if (check_crl_time(ctx, delta, 0))
1117                                 *pscore |= CRL_SCORE_TIME_DELTA;
1118                         CRYPTO_add(&delta->references, 1, CRYPTO_LOCK_X509_CRL);
1119                         *dcrl = delta;
1120                         return;
1121                         }
1122                 }
1123         *dcrl = NULL;
1124         }
1125
1126 /* For a given CRL return how suitable it is for the supplied certificate 'x'.
1127  * The return value is a mask of several criteria.
1128  * If the issuer is not the certificate issuer this is returned in *pissuer.
1129  * The reasons mask is also used to determine if the CRL is suitable: if
1130  * no new reasons the CRL is rejected, otherwise reasons is updated.
1131  */
1132
1133 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
1134                         unsigned int *preasons,
1135                         X509_CRL *crl, X509 *x)
1136         {
1137
1138         int crl_score = 0;
1139         unsigned int tmp_reasons = *preasons, crl_reasons;
1140
1141         /* First see if we can reject CRL straight away */
1142
1143         /* Invalid IDP cannot be processed */
1144         if (crl->idp_flags & IDP_INVALID)
1145                 return 0;
1146         /* Reason codes or indirect CRLs need extended CRL support */
1147         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1148                 {
1149                 if (crl->idp_flags & (IDP_INDIRECT | IDP_REASONS))
1150                         return 0;
1151                 }
1152         else if (crl->idp_flags & IDP_REASONS)
1153                 {
1154                 /* If no new reasons reject */
1155                 if (!(crl->idp_reasons & ~tmp_reasons))
1156                         return 0;
1157                 }
1158         /* Don't process deltas at this stage */
1159         else if (crl->base_crl_number)
1160                 return 0;
1161         /* If issuer name doesn't match certificate need indirect CRL */
1162         if (X509_NAME_cmp(X509_get_issuer_name(x), X509_CRL_get_issuer(crl)))
1163                 {
1164                 if (!(crl->idp_flags & IDP_INDIRECT))
1165                         return 0;
1166                 }
1167         else
1168                 crl_score |= CRL_SCORE_ISSUER_NAME;
1169
1170         if (!(crl->flags & EXFLAG_CRITICAL))
1171                 crl_score |= CRL_SCORE_NOCRITICAL;
1172
1173         /* Check expiry */
1174         if (check_crl_time(ctx, crl, 0))
1175                 crl_score |= CRL_SCORE_TIME;
1176
1177         /* Check authority key ID and locate certificate issuer */
1178         crl_akid_check(ctx, crl, pissuer, &crl_score);
1179
1180         /* If we can't locate certificate issuer at this point forget it */
1181
1182         if (!(crl_score & CRL_SCORE_AKID))
1183                 return 0;
1184
1185         /* Check cert for matching CRL distribution points */
1186
1187         if (crl_crldp_check(x, crl, crl_score, &crl_reasons))
1188                 {
1189                 /* If no new reasons reject */
1190                 if (!(crl_reasons & ~tmp_reasons))
1191                         return 0;
1192                 tmp_reasons |= crl_reasons;
1193                 crl_score |= CRL_SCORE_SCOPE;
1194                 }
1195
1196         *preasons = tmp_reasons;
1197
1198         return crl_score;
1199
1200         }
1201
1202 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
1203                                 X509 **pissuer, int *pcrl_score)
1204         {
1205         X509 *crl_issuer = NULL;
1206         X509_NAME *cnm = X509_CRL_get_issuer(crl);
1207         int cidx = ctx->error_depth;
1208         int i;
1209
1210         if (cidx != sk_X509_num(ctx->chain) - 1)
1211                 cidx++;
1212
1213         crl_issuer = sk_X509_value(ctx->chain, cidx);
1214
1215         if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1216                 {
1217                 if (*pcrl_score & CRL_SCORE_ISSUER_NAME)
1218                         {
1219                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_ISSUER_CERT;
1220                         *pissuer = crl_issuer;
1221                         return;
1222                         }
1223                 }
1224
1225         for (cidx++; cidx < sk_X509_num(ctx->chain); cidx++)
1226                 {
1227                 crl_issuer = sk_X509_value(ctx->chain, cidx);
1228                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1229                         continue;
1230                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1231                         {
1232                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_SAME_PATH;
1233                         *pissuer = crl_issuer;
1234                         return;
1235                         }
1236                 }
1237
1238         /* Anything else needs extended CRL support */
1239
1240         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1241                 return;
1242
1243         /* Otherwise the CRL issuer is not on the path. Look for it in the
1244          * set of untrusted certificates.
1245          */
1246         for (i = 0; i < sk_X509_num(ctx->untrusted); i++)
1247                 {
1248                 crl_issuer = sk_X509_value(ctx->untrusted, i);
1249                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1250                         continue;
1251                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1252                         {
1253                         *pissuer = crl_issuer;
1254                         *pcrl_score |= CRL_SCORE_AKID;
1255                         return;
1256                         }
1257                 }
1258         }
1259
1260 /* Check the path of a CRL issuer certificate. This creates a new
1261  * X509_STORE_CTX and populates it with most of the parameters from the
1262  * parent. This could be optimised somewhat since a lot of path checking
1263  * will be duplicated by the parent, but this will rarely be used in
1264  * practice.
1265  */
1266
1267 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x)
1268         {
1269         X509_STORE_CTX crl_ctx;
1270         int ret;
1271         /* Don't allow recursive CRL path validation */
1272         if (ctx->parent)
1273                 return 0;
1274         if (!X509_STORE_CTX_init(&crl_ctx, ctx->ctx, x, ctx->untrusted))
1275                 return -1;
1276
1277         crl_ctx.crls = ctx->crls;
1278         /* Copy verify params across */
1279         X509_STORE_CTX_set0_param(&crl_ctx, ctx->param);
1280
1281         crl_ctx.parent = ctx;
1282         crl_ctx.verify_cb = ctx->verify_cb;
1283
1284         /* Verify CRL issuer */
1285         ret = X509_verify_cert(&crl_ctx);
1286
1287         if (ret <= 0)
1288                 goto err;
1289
1290         /* Check chain is acceptable */
1291
1292         ret = check_crl_chain(ctx, ctx->chain, crl_ctx.chain);
1293         err:
1294         X509_STORE_CTX_cleanup(&crl_ctx);
1295         return ret;
1296         }
1297
1298 /* RFC3280 says nothing about the relationship between CRL path
1299  * and certificate path, which could lead to situations where a
1300  * certificate could be revoked or validated by a CA not authorised
1301  * to do so. RFC5280 is more strict and states that the two paths must
1302  * end in the same trust anchor, though some discussions remain...
1303  * until this is resolved we use the RFC5280 version
1304  */
1305
1306 static int check_crl_chain(X509_STORE_CTX *ctx,
1307                         STACK_OF(X509) *cert_path,
1308                         STACK_OF(X509) *crl_path)
1309         {
1310         X509 *cert_ta, *crl_ta;
1311         cert_ta = sk_X509_value(cert_path, sk_X509_num(cert_path) - 1);
1312         crl_ta = sk_X509_value(crl_path, sk_X509_num(crl_path) - 1);
1313         if (!X509_cmp(cert_ta, crl_ta))
1314                 return 1;
1315         return 0;
1316         }
1317
1318 /* Check for match between two dist point names: three separate cases.
1319  * 1. Both are relative names and compare X509_NAME types.
1320  * 2. One full, one relative. Compare X509_NAME to GENERAL_NAMES.
1321  * 3. Both are full names and compare two GENERAL_NAMES.
1322  * 4. One is NULL: automatic match.
1323  */
1324
1325
1326 static int idp_check_dp(DIST_POINT_NAME *a, DIST_POINT_NAME *b)
1327         {
1328         X509_NAME *nm = NULL;
1329         GENERAL_NAMES *gens = NULL;
1330         GENERAL_NAME *gena, *genb;
1331         int i, j;
1332         if (!a || !b)
1333                 return 1;
1334         if (a->type == 1)
1335                 {
1336                 if (!a->dpname)
1337                         return 0;
1338                 /* Case 1: two X509_NAME */
1339                 if (b->type == 1)
1340                         {
1341                         if (!b->dpname)
1342                                 return 0;
1343                         if (!X509_NAME_cmp(a->dpname, b->dpname))
1344                                 return 1;
1345                         else
1346                                 return 0;
1347                         }
1348                 /* Case 2: set name and GENERAL_NAMES appropriately */
1349                 nm = a->dpname;
1350                 gens = b->name.fullname;
1351                 }
1352         else if (b->type == 1)
1353                 {
1354                 if (!b->dpname)
1355                         return 0;
1356                 /* Case 2: set name and GENERAL_NAMES appropriately */
1357                 gens = a->name.fullname;
1358                 nm = b->dpname;
1359                 }
1360
1361         /* Handle case 2 with one GENERAL_NAMES and one X509_NAME */
1362         if (nm)
1363                 {
1364                 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++)
1365                         {
1366                         gena = sk_GENERAL_NAME_value(gens, i);
1367                         if (gena->type != GEN_DIRNAME)
1368                                 continue;
1369                         if (!X509_NAME_cmp(nm, gena->d.directoryName))
1370                                 return 1;
1371                         }
1372                 return 0;
1373                 }
1374
1375         /* Else case 3: two GENERAL_NAMES */
1376
1377         for (i = 0; i < sk_GENERAL_NAME_num(a->name.fullname); i++)
1378                 {
1379                 gena = sk_GENERAL_NAME_value(a->name.fullname, i);
1380                 for (j = 0; j < sk_GENERAL_NAME_num(b->name.fullname); j++)
1381                         {
1382                         genb = sk_GENERAL_NAME_value(b->name.fullname, j);
1383                         if (!GENERAL_NAME_cmp(gena, genb))
1384                                 return 1;
1385                         }
1386                 }
1387
1388         return 0;
1389
1390         }
1391
1392 static int crldp_check_crlissuer(DIST_POINT *dp, X509_CRL *crl, int crl_score)
1393         {
1394         int i;
1395         X509_NAME *nm = X509_CRL_get_issuer(crl);
1396         /* If no CRLissuer return is successful iff don't need a match */
1397         if (!dp->CRLissuer)
1398                 return !!(crl_score & CRL_SCORE_ISSUER_NAME);
1399         for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++)
1400                 {
1401                 GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
1402                 if (gen->type != GEN_DIRNAME)
1403                         continue;
1404                 if (!X509_NAME_cmp(gen->d.directoryName, nm))
1405                         return 1;
1406                 }
1407         return 0;
1408         }
1409
1410 /* Check CRLDP and IDP */
1411
1412 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
1413                                 unsigned int *preasons)
1414         {
1415         int i;
1416         if (crl->idp_flags & IDP_ONLYATTR)
1417                 return 0;
1418         if (x->ex_flags & EXFLAG_CA)
1419                 {
1420                 if (crl->idp_flags & IDP_ONLYUSER)
1421                         return 0;
1422                 }
1423         else
1424                 {
1425                 if (crl->idp_flags & IDP_ONLYCA)
1426                         return 0;
1427                 }
1428         *preasons = crl->idp_reasons;
1429         for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++)
1430                 {
1431                 DIST_POINT *dp = sk_DIST_POINT_value(x->crldp, i);
1432                 if (crldp_check_crlissuer(dp, crl, crl_score))
1433                         {
1434                         if (!crl->idp ||
1435                              idp_check_dp(dp->distpoint, crl->idp->distpoint))
1436                                 {
1437                                 *preasons &= dp->dp_reasons;
1438                                 return 1;
1439                                 }
1440                         }
1441                 }
1442         if ((!crl->idp || !crl->idp->distpoint) && (crl_score & CRL_SCORE_ISSUER_NAME))
1443                 return 1;
1444         return 0;
1445         }
1446
1447 /* Retrieve CRL corresponding to current certificate.
1448  * If deltas enabled try to find a delta CRL too
1449  */
1450
1451 static int get_crl_delta(X509_STORE_CTX *ctx,
1452                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)
1453         {
1454         int ok;
1455         X509 *issuer = NULL;
1456         int crl_score = 0;
1457         unsigned int reasons;
1458         X509_CRL *crl = NULL, *dcrl = NULL;
1459         STACK_OF(X509_CRL) *skcrl;
1460         X509_NAME *nm = X509_get_issuer_name(x);
1461         reasons = ctx->current_reasons;
1462         ok = get_crl_sk(ctx, &crl, &dcrl,
1463                                 &issuer, &crl_score, &reasons, ctx->crls);
1464
1465         if (ok)
1466                 goto done;
1467
1468         /* Lookup CRLs from store */
1469
1470         skcrl = ctx->lookup_crls(ctx, nm);
1471
1472         /* If no CRLs found and a near match from get_crl_sk use that */
1473         if (!skcrl && crl)
1474                 goto done;
1475
1476         get_crl_sk(ctx, &crl, &dcrl, &issuer, &crl_score, &reasons, skcrl);
1477
1478         sk_X509_CRL_pop_free(skcrl, X509_CRL_free);
1479
1480         done:
1481
1482         /* If we got any kind of CRL use it and return success */
1483         if (crl)
1484                 {
1485                 ctx->current_issuer = issuer;
1486                 ctx->current_crl_score = crl_score;
1487                 ctx->current_reasons = reasons;
1488                 *pcrl = crl;
1489                 *pdcrl = dcrl;
1490                 return 1;
1491                 }
1492
1493         return 0;
1494         }
1495
1496 /* Check CRL validity */
1497 static int check_crl(X509_STORE_CTX *ctx, X509_CRL *crl)
1498         {
1499         X509 *issuer = NULL;
1500         EVP_PKEY *ikey = NULL;
1501         int ok = 0, chnum, cnum;
1502         cnum = ctx->error_depth;
1503         chnum = sk_X509_num(ctx->chain) - 1;
1504         /* if we have an alternative CRL issuer cert use that */
1505         if (ctx->current_issuer)
1506                 issuer = ctx->current_issuer;
1507
1508         /* Else find CRL issuer: if not last certificate then issuer
1509          * is next certificate in chain.
1510          */
1511         else if (cnum < chnum)
1512                 issuer = sk_X509_value(ctx->chain, cnum + 1);
1513         else
1514                 {
1515                 issuer = sk_X509_value(ctx->chain, chnum);
1516                 /* If not self signed, can't check signature */
1517                 if(!ctx->check_issued(ctx, issuer, issuer))
1518                         {
1519                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER;
1520                         ok = ctx->verify_cb(0, ctx);
1521                         if(!ok) goto err;
1522                         }
1523                 }
1524
1525         if(issuer)
1526                 {
1527                 /* Skip most tests for deltas because they have already
1528                  * been done
1529                  */
1530                 if (!crl->base_crl_number)
1531                         {
1532                         /* Check for cRLSign bit if keyUsage present */
1533                         if ((issuer->ex_flags & EXFLAG_KUSAGE) &&
1534                                 !(issuer->ex_kusage & KU_CRL_SIGN))
1535                                 {
1536                                 ctx->error = X509_V_ERR_KEYUSAGE_NO_CRL_SIGN;
1537                                 ok = ctx->verify_cb(0, ctx);
1538                                 if(!ok) goto err;
1539                                 }
1540
1541                         if (!(ctx->current_crl_score & CRL_SCORE_SCOPE))
1542                                 {
1543                                 ctx->error = X509_V_ERR_DIFFERENT_CRL_SCOPE;
1544                                 ok = ctx->verify_cb(0, ctx);
1545                                 if(!ok) goto err;
1546                                 }
1547
1548                         if (!(ctx->current_crl_score & CRL_SCORE_SAME_PATH))
1549                                 {
1550                                 if (check_crl_path(ctx, ctx->current_issuer) <= 0)
1551                                         {
1552                                         ctx->error = X509_V_ERR_CRL_PATH_VALIDATION_ERROR;
1553                                         ok = ctx->verify_cb(0, ctx);
1554                                         if(!ok) goto err;
1555                                         }
1556                                 }
1557
1558                         if (crl->idp_flags & IDP_INVALID)
1559                                 {
1560                                 ctx->error = X509_V_ERR_INVALID_EXTENSION;
1561                                 ok = ctx->verify_cb(0, ctx);
1562                                 if(!ok) goto err;
1563                                 }
1564
1565
1566                         }
1567
1568                 if (!(ctx->current_crl_score & CRL_SCORE_TIME))
1569                         {
1570                         ok = check_crl_time(ctx, crl, 1);
1571                         if (!ok)
1572                                 goto err;
1573                         }
1574
1575                 /* Attempt to get issuer certificate public key */
1576                 ikey = X509_get_pubkey(issuer);
1577
1578                 if(!ikey)
1579                         {
1580                         ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1581                         ok = ctx->verify_cb(0, ctx);
1582                         if (!ok) goto err;
1583                         }
1584                 else
1585                         {
1586                         int rv;
1587                         rv = X509_CRL_check_suiteb(crl, ikey, ctx->param->flags);
1588                         if (rv != X509_V_OK)
1589                                 {
1590                                 ctx->error=rv;
1591                                 ok = ctx->verify_cb(0, ctx);
1592                                 if (!ok)
1593                                         goto err;
1594                                 }
1595                         /* Verify CRL signature */
1596                         if(X509_CRL_verify(crl, ikey) <= 0)
1597                                 {
1598                                 ctx->error=X509_V_ERR_CRL_SIGNATURE_FAILURE;
1599                                 ok = ctx->verify_cb(0, ctx);
1600                                 if (!ok) goto err;
1601                                 }
1602                         }
1603                 }
1604
1605         ok = 1;
1606
1607         err:
1608         EVP_PKEY_free(ikey);
1609         return ok;
1610         }
1611
1612 /* Check certificate against CRL */
1613 static int cert_crl(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x)
1614         {
1615         int ok;
1616         X509_REVOKED *rev;
1617         /* The rules changed for this... previously if a CRL contained
1618          * unhandled critical extensions it could still be used to indicate
1619          * a certificate was revoked. This has since been changed since
1620          * critical extension can change the meaning of CRL entries.
1621          */
1622         if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
1623                 && (crl->flags & EXFLAG_CRITICAL))
1624                 {
1625                 ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION;
1626                 ok = ctx->verify_cb(0, ctx);
1627                 if(!ok)
1628                         return 0;
1629                 }
1630         /* Look for serial number of certificate in CRL
1631          * If found make sure reason is not removeFromCRL.
1632          */
1633         if (X509_CRL_get0_by_cert(crl, &rev, x))
1634                 {
1635                 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
1636                         return 2;
1637                 ctx->error = X509_V_ERR_CERT_REVOKED;
1638                 ok = ctx->verify_cb(0, ctx);
1639                 if (!ok)
1640                         return 0;
1641                 }
1642
1643         return 1;
1644         }
1645
1646 static int check_policy(X509_STORE_CTX *ctx)
1647         {
1648         int ret;
1649         if (ctx->parent)
1650                 return 1;
1651         ret = X509_policy_check(&ctx->tree, &ctx->explicit_policy, ctx->chain,
1652                                 ctx->param->policies, ctx->param->flags);
1653         if (ret == 0)
1654                 {
1655                 X509err(X509_F_CHECK_POLICY,ERR_R_MALLOC_FAILURE);
1656                 return 0;
1657                 }
1658         /* Invalid or inconsistent extensions */
1659         if (ret == -1)
1660                 {
1661                 /* Locate certificates with bad extensions and notify
1662                  * callback.
1663                  */
1664                 X509 *x;
1665                 int i;
1666                 for (i = 1; i < sk_X509_num(ctx->chain); i++)
1667                         {
1668                         x = sk_X509_value(ctx->chain, i);
1669                         if (!(x->ex_flags & EXFLAG_INVALID_POLICY))
1670                                 continue;
1671                         ctx->current_cert = x;
1672                         ctx->error = X509_V_ERR_INVALID_POLICY_EXTENSION;
1673                         if(!ctx->verify_cb(0, ctx))
1674                                 return 0;
1675                         }
1676                 return 1;
1677                 }
1678         if (ret == -2)
1679                 {
1680                 ctx->current_cert = NULL;
1681                 ctx->error = X509_V_ERR_NO_EXPLICIT_POLICY;
1682                 return ctx->verify_cb(0, ctx);
1683                 }
1684
1685         if (ctx->param->flags & X509_V_FLAG_NOTIFY_POLICY)
1686                 {
1687                 ctx->current_cert = NULL;
1688                 ctx->error = X509_V_OK;
1689                 if (!ctx->verify_cb(2, ctx))
1690                         return 0;
1691                 }
1692
1693         return 1;
1694         }
1695
1696 static int check_cert_time(X509_STORE_CTX *ctx, X509 *x)
1697         {
1698         time_t *ptime;
1699         int i;
1700
1701         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
1702                 ptime = &ctx->param->check_time;
1703         else
1704                 ptime = NULL;
1705
1706         i=X509_cmp_time(X509_get_notBefore(x), ptime);
1707         if (i == 0)
1708                 {
1709                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
1710                 ctx->current_cert=x;
1711                 if (!ctx->verify_cb(0, ctx))
1712                         return 0;
1713                 }
1714
1715         if (i > 0)
1716                 {
1717                 ctx->error=X509_V_ERR_CERT_NOT_YET_VALID;
1718                 ctx->current_cert=x;
1719                 if (!ctx->verify_cb(0, ctx))
1720                         return 0;
1721                 }
1722
1723         i=X509_cmp_time(X509_get_notAfter(x), ptime);
1724         if (i == 0)
1725                 {
1726                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
1727                 ctx->current_cert=x;
1728                 if (!ctx->verify_cb(0, ctx))
1729                         return 0;
1730                 }
1731
1732         if (i < 0)
1733                 {
1734                 ctx->error=X509_V_ERR_CERT_HAS_EXPIRED;
1735                 ctx->current_cert=x;
1736                 if (!ctx->verify_cb(0, ctx))
1737                         return 0;
1738                 }
1739
1740         return 1;
1741         }
1742
1743 static int internal_verify(X509_STORE_CTX *ctx)
1744         {
1745         int ok=0,n;
1746         X509 *xs,*xi;
1747         EVP_PKEY *pkey=NULL;
1748         int (*cb)(int xok,X509_STORE_CTX *xctx);
1749
1750         cb=ctx->verify_cb;
1751
1752         n=sk_X509_num(ctx->chain);
1753         ctx->error_depth=n-1;
1754         n--;
1755         xi=sk_X509_value(ctx->chain,n);
1756
1757         if (ctx->check_issued(ctx, xi, xi))
1758                 xs=xi;
1759         else
1760                 {
1761                 if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN)
1762                         {
1763                         xs = xi;
1764                         goto check_cert;
1765                         }
1766                 if (n <= 0)
1767                         {
1768                         ctx->error=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
1769                         ctx->current_cert=xi;
1770                         ok=cb(0,ctx);
1771                         goto end;
1772                         }
1773                 else
1774                         {
1775                         n--;
1776                         ctx->error_depth=n;
1777                         xs=sk_X509_value(ctx->chain,n);
1778                         }
1779                 }
1780
1781 /*      ctx->error=0;  not needed */
1782         while (n >= 0)
1783                 {
1784                 ctx->error_depth=n;
1785
1786                 /* Skip signature check for self signed certificates unless
1787                  * explicitly asked for. It doesn't add any security and
1788                  * just wastes time.
1789                  */
1790                 if (!xs->valid && (xs != xi || (ctx->param->flags & X509_V_FLAG_CHECK_SS_SIGNATURE)))
1791                         {
1792                         if ((pkey=X509_get_pubkey(xi)) == NULL)
1793                                 {
1794                                 ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1795                                 ctx->current_cert=xi;
1796                                 ok=(*cb)(0,ctx);
1797                                 if (!ok) goto end;
1798                                 }
1799                         else if (X509_verify(xs,pkey) <= 0)
1800                                 {
1801                                 ctx->error=X509_V_ERR_CERT_SIGNATURE_FAILURE;
1802                                 ctx->current_cert=xs;
1803                                 ok=(*cb)(0,ctx);
1804                                 if (!ok)
1805                                         {
1806                                         EVP_PKEY_free(pkey);
1807                                         goto end;
1808                                         }
1809                                 }
1810                         EVP_PKEY_free(pkey);
1811                         pkey=NULL;
1812                         }
1813
1814                 xs->valid = 1;
1815
1816                 check_cert:
1817                 ok = check_cert_time(ctx, xs);
1818                 if (!ok)
1819                         goto end;
1820
1821                 /* The last error (if any) is still in the error value */
1822                 ctx->current_issuer=xi;
1823                 ctx->current_cert=xs;
1824                 ok=(*cb)(1,ctx);
1825                 if (!ok) goto end;
1826
1827                 n--;
1828                 if (n >= 0)
1829                         {
1830                         xi=xs;
1831                         xs=sk_X509_value(ctx->chain,n);
1832                         }
1833                 }
1834         ok=1;
1835 end:
1836         return ok;
1837         }
1838
1839 int X509_cmp_current_time(const ASN1_TIME *ctm)
1840 {
1841         return X509_cmp_time(ctm, NULL);
1842 }
1843
1844 int X509_cmp_time(const ASN1_TIME *ctm, time_t *cmp_time)
1845         {
1846         char *str;
1847         ASN1_TIME atm;
1848         long offset;
1849         char buff1[24],buff2[24],*p;
1850         int i,j;
1851
1852         p=buff1;
1853         i=ctm->length;
1854         str=(char *)ctm->data;
1855         if (ctm->type == V_ASN1_UTCTIME)
1856                 {
1857                 if ((i < 11) || (i > 17)) return 0;
1858                 memcpy(p,str,10);
1859                 p+=10;
1860                 str+=10;
1861                 }
1862         else
1863                 {
1864                 if (i < 13) return 0;
1865                 memcpy(p,str,12);
1866                 p+=12;
1867                 str+=12;
1868                 }
1869
1870         if ((*str == 'Z') || (*str == '-') || (*str == '+'))
1871                 { *(p++)='0'; *(p++)='0'; }
1872         else
1873                 {
1874                 *(p++)= *(str++);
1875                 *(p++)= *(str++);
1876                 /* Skip any fractional seconds... */
1877                 if (*str == '.')
1878                         {
1879                         str++;
1880                         while ((*str >= '0') && (*str <= '9')) str++;
1881                         }
1882
1883                 }
1884         *(p++)='Z';
1885         *(p++)='\0';
1886
1887         if (*str == 'Z')
1888                 offset=0;
1889         else
1890                 {
1891                 if ((*str != '+') && (*str != '-'))
1892                         return 0;
1893                 offset=((str[1]-'0')*10+(str[2]-'0'))*60;
1894                 offset+=(str[3]-'0')*10+(str[4]-'0');
1895                 if (*str == '-')
1896                         offset= -offset;
1897                 }
1898         atm.type=ctm->type;
1899         atm.flags = 0;
1900         atm.length=sizeof(buff2);
1901         atm.data=(unsigned char *)buff2;
1902
1903         if (X509_time_adj(&atm, offset*60, cmp_time) == NULL)
1904                 return 0;
1905
1906         if (ctm->type == V_ASN1_UTCTIME)
1907                 {
1908                 i=(buff1[0]-'0')*10+(buff1[1]-'0');
1909                 if (i < 50) i+=100; /* cf. RFC 2459 */
1910                 j=(buff2[0]-'0')*10+(buff2[1]-'0');
1911                 if (j < 50) j+=100;
1912
1913                 if (i < j) return -1;
1914                 if (i > j) return 1;
1915                 }
1916         i=strcmp(buff1,buff2);
1917         if (i == 0) /* wait a second then return younger :-) */
1918                 return -1;
1919         else
1920                 return i;
1921         }
1922
1923 ASN1_TIME *X509_gmtime_adj(ASN1_TIME *s, long adj)
1924 {
1925         return X509_time_adj(s, adj, NULL);
1926 }
1927
1928 ASN1_TIME *X509_time_adj(ASN1_TIME *s, long offset_sec, time_t *in_tm)
1929         {
1930         return X509_time_adj_ex(s, 0, offset_sec, in_tm);
1931         }
1932
1933 ASN1_TIME *X509_time_adj_ex(ASN1_TIME *s,
1934                                 int offset_day, long offset_sec, time_t *in_tm)
1935         {
1936         time_t t;
1937
1938         if (in_tm) t = *in_tm;
1939         else time(&t);
1940
1941         if (s && !(s->flags & ASN1_STRING_FLAG_MSTRING))
1942                 {
1943                 if (s->type == V_ASN1_UTCTIME)
1944                         return ASN1_UTCTIME_adj(s,t, offset_day, offset_sec);
1945                 if (s->type == V_ASN1_GENERALIZEDTIME)
1946                         return ASN1_GENERALIZEDTIME_adj(s, t, offset_day,
1947                                                                 offset_sec);
1948                 }
1949         return ASN1_TIME_adj(s, t, offset_day, offset_sec);
1950         }
1951
1952 int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain)
1953         {
1954         EVP_PKEY *ktmp=NULL,*ktmp2;
1955         int i,j;
1956
1957         if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) return 1;
1958
1959         for (i=0; i<sk_X509_num(chain); i++)
1960                 {
1961                 ktmp=X509_get_pubkey(sk_X509_value(chain,i));
1962                 if (ktmp == NULL)
1963                         {
1964                         X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
1965                         return 0;
1966                         }
1967                 if (!EVP_PKEY_missing_parameters(ktmp))
1968                         break;
1969                 else
1970                         {
1971                         EVP_PKEY_free(ktmp);
1972                         ktmp=NULL;
1973                         }
1974                 }
1975         if (ktmp == NULL)
1976                 {
1977                 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
1978                 return 0;
1979                 }
1980
1981         /* first, populate the other certs */
1982         for (j=i-1; j >= 0; j--)
1983                 {
1984                 ktmp2=X509_get_pubkey(sk_X509_value(chain,j));
1985                 EVP_PKEY_copy_parameters(ktmp2,ktmp);
1986                 EVP_PKEY_free(ktmp2);
1987                 }
1988
1989         if (pkey != NULL) EVP_PKEY_copy_parameters(pkey,ktmp);
1990         EVP_PKEY_free(ktmp);
1991         return 1;
1992         }
1993
1994 /* Make a delta CRL as the diff between two full CRLs */
1995
1996 X509_CRL *X509_CRL_diff(X509_CRL *base, X509_CRL *newer,
1997                         EVP_PKEY *skey, const EVP_MD *md, unsigned int flags)
1998         {
1999         X509_CRL *crl = NULL;
2000         int i;
2001         STACK_OF(X509_REVOKED) *revs = NULL;
2002         /* CRLs can't be delta already */
2003         if (base->base_crl_number || newer->base_crl_number)
2004                         {
2005                         X509err(X509_F_X509_CRL_DIFF, X509_R_CRL_ALREADY_DELTA);
2006                         return NULL;
2007                         }
2008         /* Base and new CRL must have a CRL number */
2009         if (!base->crl_number || !newer->crl_number)
2010                         {
2011                         X509err(X509_F_X509_CRL_DIFF, X509_R_NO_CRL_NUMBER);
2012                         return NULL;
2013                         }
2014         /* Issuer names must match */
2015         if (X509_NAME_cmp(X509_CRL_get_issuer(base),
2016                                 X509_CRL_get_issuer(newer)))
2017                         {
2018                         X509err(X509_F_X509_CRL_DIFF, X509_R_ISSUER_MISMATCH);
2019                         return NULL;
2020                         }
2021         /* AKID and IDP must match */
2022         if (!crl_extension_match(base, newer, NID_authority_key_identifier))
2023                         {
2024                         X509err(X509_F_X509_CRL_DIFF, X509_R_AKID_MISMATCH);
2025                         return NULL;
2026                         }
2027         if (!crl_extension_match(base, newer, NID_issuing_distribution_point))
2028                         {
2029                         X509err(X509_F_X509_CRL_DIFF, X509_R_IDP_MISMATCH);
2030                         return NULL;
2031                         }
2032         /* Newer CRL number must exceed full CRL number */
2033         if (ASN1_INTEGER_cmp(newer->crl_number, base->crl_number) <= 0)
2034                         {
2035                         X509err(X509_F_X509_CRL_DIFF, X509_R_NEWER_CRL_NOT_NEWER);
2036                         return NULL;
2037                         }
2038         /* CRLs must verify */
2039         if (skey && (X509_CRL_verify(base, skey) <= 0 ||
2040                         X509_CRL_verify(newer, skey) <= 0))
2041                 {
2042                 X509err(X509_F_X509_CRL_DIFF, X509_R_CRL_VERIFY_FAILURE);
2043                 return NULL;
2044                 }
2045         /* Create new CRL */
2046         crl = X509_CRL_new();
2047         if (!crl || !X509_CRL_set_version(crl, 1))
2048                 goto memerr;
2049         /* Set issuer name */
2050         if (!X509_CRL_set_issuer_name(crl, X509_CRL_get_issuer(newer)))
2051                 goto memerr;
2052
2053         if (!X509_CRL_set_lastUpdate(crl, X509_CRL_get_lastUpdate(newer)))
2054                 goto memerr;
2055         if (!X509_CRL_set_nextUpdate(crl, X509_CRL_get_nextUpdate(newer)))
2056                 goto memerr;
2057
2058         /* Set base CRL number: must be critical */
2059
2060         if (!X509_CRL_add1_ext_i2d(crl, NID_delta_crl, base->crl_number, 1, 0))
2061                 goto memerr;
2062
2063         /* Copy extensions across from newest CRL to delta: this will set
2064          * CRL number to correct value too.
2065          */
2066
2067         for (i = 0; i < X509_CRL_get_ext_count(newer); i++)
2068                 {
2069                 X509_EXTENSION *ext;
2070                 ext = X509_CRL_get_ext(newer, i);
2071                 if (!X509_CRL_add_ext(crl, ext, -1))
2072                         goto memerr;
2073                 }
2074
2075         /* Go through revoked entries, copying as needed */
2076
2077         revs = X509_CRL_get_REVOKED(newer);
2078
2079         for (i = 0; i < sk_X509_REVOKED_num(revs); i++)
2080                 {
2081                 X509_REVOKED *rvn, *rvtmp;
2082                 rvn = sk_X509_REVOKED_value(revs, i);
2083                 /* Add only if not also in base.
2084                  * TODO: need something cleverer here for some more complex
2085                  * CRLs covering multiple CAs.
2086                  */
2087                 if (!X509_CRL_get0_by_serial(base, &rvtmp, rvn->serialNumber))
2088                         {
2089                         rvtmp = X509_REVOKED_dup(rvn);
2090                         if (!rvtmp)
2091                                 goto memerr;
2092                         if (!X509_CRL_add0_revoked(crl, rvtmp))
2093                                 {
2094                                 X509_REVOKED_free(rvtmp);
2095                                 goto memerr;
2096                                 }
2097                         }
2098                 }
2099         /* TODO: optionally prune deleted entries */
2100
2101         if (skey && md && !X509_CRL_sign(crl, skey, md))
2102                 goto memerr;
2103
2104         return crl;
2105
2106         memerr:
2107         X509err(X509_F_X509_CRL_DIFF, ERR_R_MALLOC_FAILURE);
2108         if (crl)
2109                 X509_CRL_free(crl);
2110         return NULL;
2111         }
2112
2113 int X509_STORE_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
2114              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
2115         {
2116         /* This function is (usually) called only once, by
2117          * SSL_get_ex_data_X509_STORE_CTX_idx (ssl/ssl_cert.c). */
2118         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_X509_STORE_CTX, argl, argp,
2119                         new_func, dup_func, free_func);
2120         }
2121
2122 int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data)
2123         {
2124         return CRYPTO_set_ex_data(&ctx->ex_data,idx,data);
2125         }
2126
2127 void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx)
2128         {
2129         return CRYPTO_get_ex_data(&ctx->ex_data,idx);
2130         }
2131
2132 int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx)
2133         {
2134         return ctx->error;
2135         }
2136
2137 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err)
2138         {
2139         ctx->error=err;
2140         }
2141
2142 int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx)
2143         {
2144         return ctx->error_depth;
2145         }
2146
2147 X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx)
2148         {
2149         return ctx->current_cert;
2150         }
2151
2152 STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx)
2153         {
2154         return ctx->chain;
2155         }
2156
2157 STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx)
2158         {
2159         if (!ctx->chain)
2160                 return NULL;
2161         return X509_chain_up_ref(ctx->chain);
2162         }
2163
2164 X509 *X509_STORE_CTX_get0_current_issuer(X509_STORE_CTX *ctx)
2165         {
2166         return ctx->current_issuer;
2167         }
2168
2169 X509_CRL *X509_STORE_CTX_get0_current_crl(X509_STORE_CTX *ctx)
2170         {
2171         return ctx->current_crl;
2172         }
2173
2174 X509_STORE_CTX *X509_STORE_CTX_get0_parent_ctx(X509_STORE_CTX *ctx)
2175         {
2176         return ctx->parent;
2177         }
2178
2179 void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x)
2180         {
2181         ctx->cert=x;
2182         }
2183
2184 void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2185         {
2186         ctx->untrusted=sk;
2187         }
2188
2189 void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk)
2190         {
2191         ctx->crls=sk;
2192         }
2193
2194 int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose)
2195         {
2196         return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0);
2197         }
2198
2199 int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust)
2200         {
2201         return X509_STORE_CTX_purpose_inherit(ctx, 0, 0, trust);
2202         }
2203
2204 /* This function is used to set the X509_STORE_CTX purpose and trust
2205  * values. This is intended to be used when another structure has its
2206  * own trust and purpose values which (if set) will be inherited by
2207  * the ctx. If they aren't set then we will usually have a default
2208  * purpose in mind which should then be used to set the trust value.
2209  * An example of this is SSL use: an SSL structure will have its own
2210  * purpose and trust settings which the application can set: if they
2211  * aren't set then we use the default of SSL client/server.
2212  */
2213
2214 int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
2215                                 int purpose, int trust)
2216 {
2217         int idx;
2218         /* If purpose not set use default */
2219         if (!purpose) purpose = def_purpose;
2220         /* If we have a purpose then check it is valid */
2221         if (purpose)
2222                 {
2223                 X509_PURPOSE *ptmp;
2224                 idx = X509_PURPOSE_get_by_id(purpose);
2225                 if (idx == -1)
2226                         {
2227                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2228                                                 X509_R_UNKNOWN_PURPOSE_ID);
2229                         return 0;
2230                         }
2231                 ptmp = X509_PURPOSE_get0(idx);
2232                 if (ptmp->trust == X509_TRUST_DEFAULT)
2233                         {
2234                         idx = X509_PURPOSE_get_by_id(def_purpose);
2235                         if (idx == -1)
2236                                 {
2237                                 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2238                                                 X509_R_UNKNOWN_PURPOSE_ID);
2239                                 return 0;
2240                                 }
2241                         ptmp = X509_PURPOSE_get0(idx);
2242                         }
2243                 /* If trust not set then get from purpose default */
2244                 if (!trust) trust = ptmp->trust;
2245                 }
2246         if (trust)
2247                 {
2248                 idx = X509_TRUST_get_by_id(trust);
2249                 if (idx == -1)
2250                         {
2251                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2252                                                 X509_R_UNKNOWN_TRUST_ID);
2253                         return 0;
2254                         }
2255                 }
2256
2257         if (purpose && !ctx->param->purpose) ctx->param->purpose = purpose;
2258         if (trust && !ctx->param->trust) ctx->param->trust = trust;
2259         return 1;
2260 }
2261
2262 X509_STORE_CTX *X509_STORE_CTX_new(void)
2263 {
2264         X509_STORE_CTX *ctx;
2265         ctx = (X509_STORE_CTX *)OPENSSL_malloc(sizeof(X509_STORE_CTX));
2266         if (!ctx)
2267                 {
2268                 X509err(X509_F_X509_STORE_CTX_NEW,ERR_R_MALLOC_FAILURE);
2269                 return NULL;
2270                 }
2271         memset(ctx, 0, sizeof(X509_STORE_CTX));
2272         return ctx;
2273 }
2274
2275 void X509_STORE_CTX_free(X509_STORE_CTX *ctx)
2276 {
2277         X509_STORE_CTX_cleanup(ctx);
2278         OPENSSL_free(ctx);
2279 }
2280
2281 int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store, X509 *x509,
2282              STACK_OF(X509) *chain)
2283         {
2284         int ret = 1;
2285         ctx->ctx=store;
2286         ctx->current_method=0;
2287         ctx->cert=x509;
2288         ctx->untrusted=chain;
2289         ctx->crls = NULL;
2290         ctx->last_untrusted=0;
2291         ctx->other_ctx=NULL;
2292         ctx->valid=0;
2293         ctx->chain=NULL;
2294         ctx->error=0;
2295         ctx->explicit_policy=0;
2296         ctx->error_depth=0;
2297         ctx->current_cert=NULL;
2298         ctx->current_issuer=NULL;
2299         ctx->current_crl=NULL;
2300         ctx->current_crl_score=0;
2301         ctx->current_reasons=0;
2302         ctx->tree = NULL;
2303         ctx->parent = NULL;
2304
2305         ctx->param = X509_VERIFY_PARAM_new();
2306
2307         if (!ctx->param)
2308                 {
2309                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2310                 return 0;
2311                 }
2312
2313         /* Inherit callbacks and flags from X509_STORE if not set
2314          * use defaults.
2315          */
2316
2317
2318         if (store)
2319                 ret = X509_VERIFY_PARAM_inherit(ctx->param, store->param);
2320         else
2321                 ctx->param->inh_flags |= X509_VP_FLAG_DEFAULT|X509_VP_FLAG_ONCE;
2322
2323         if (store)
2324                 {
2325                 ctx->verify_cb = store->verify_cb;
2326                 ctx->cleanup = store->cleanup;
2327                 }
2328         else
2329                 ctx->cleanup = 0;
2330
2331         if (ret)
2332                 ret = X509_VERIFY_PARAM_inherit(ctx->param,
2333                                         X509_VERIFY_PARAM_lookup("default"));
2334
2335         if (ret == 0)
2336                 {
2337                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2338                 return 0;
2339                 }
2340
2341         if (store && store->check_issued)
2342                 ctx->check_issued = store->check_issued;
2343         else
2344                 ctx->check_issued = check_issued;
2345
2346         if (store && store->get_issuer)
2347                 ctx->get_issuer = store->get_issuer;
2348         else
2349                 ctx->get_issuer = X509_STORE_CTX_get1_issuer;
2350
2351         if (store && store->verify_cb)
2352                 ctx->verify_cb = store->verify_cb;
2353         else
2354                 ctx->verify_cb = null_callback;
2355
2356         if (store && store->verify)
2357                 ctx->verify = store->verify;
2358         else
2359                 ctx->verify = internal_verify;
2360
2361         if (store && store->check_revocation)
2362                 ctx->check_revocation = store->check_revocation;
2363         else
2364                 ctx->check_revocation = check_revocation;
2365
2366         if (store && store->get_crl)
2367                 ctx->get_crl = store->get_crl;
2368         else
2369                 ctx->get_crl = NULL;
2370
2371         if (store && store->check_crl)
2372                 ctx->check_crl = store->check_crl;
2373         else
2374                 ctx->check_crl = check_crl;
2375
2376         if (store && store->cert_crl)
2377                 ctx->cert_crl = store->cert_crl;
2378         else
2379                 ctx->cert_crl = cert_crl;
2380
2381         if (store && store->lookup_certs)
2382                 ctx->lookup_certs = store->lookup_certs;
2383         else
2384                 ctx->lookup_certs = X509_STORE_get1_certs;
2385
2386         if (store && store->lookup_crls)
2387                 ctx->lookup_crls = store->lookup_crls;
2388         else
2389                 ctx->lookup_crls = X509_STORE_get1_crls;
2390
2391         ctx->check_policy = check_policy;
2392
2393
2394         /* This memset() can't make any sense anyway, so it's removed. As
2395          * X509_STORE_CTX_cleanup does a proper "free" on the ex_data, we put a
2396          * corresponding "new" here and remove this bogus initialisation. */
2397         /* memset(&(ctx->ex_data),0,sizeof(CRYPTO_EX_DATA)); */
2398         if(!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx,
2399                                 &(ctx->ex_data)))
2400                 {
2401                 OPENSSL_free(ctx);
2402                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2403                 return 0;
2404                 }
2405         return 1;
2406         }
2407
2408 /* Set alternative lookup method: just a STACK of trusted certificates.
2409  * This avoids X509_STORE nastiness where it isn't needed.
2410  */
2411
2412 void X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2413 {
2414         ctx->other_ctx = sk;
2415         ctx->get_issuer = get_issuer_sk;
2416 }
2417
2418 void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx)
2419         {
2420         if (ctx->cleanup) ctx->cleanup(ctx);
2421         if (ctx->param != NULL)
2422                 {
2423                 if (ctx->parent == NULL)
2424                         X509_VERIFY_PARAM_free(ctx->param);
2425                 ctx->param=NULL;
2426                 }
2427         if (ctx->tree != NULL)
2428                 {
2429                 X509_policy_tree_free(ctx->tree);
2430                 ctx->tree=NULL;
2431                 }
2432         if (ctx->chain != NULL)
2433                 {
2434                 sk_X509_pop_free(ctx->chain,X509_free);
2435                 ctx->chain=NULL;
2436                 }
2437         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, &(ctx->ex_data));
2438         memset(&ctx->ex_data,0,sizeof(CRYPTO_EX_DATA));
2439         }
2440
2441 void X509_STORE_CTX_set_depth(X509_STORE_CTX *ctx, int depth)
2442         {
2443         X509_VERIFY_PARAM_set_depth(ctx->param, depth);
2444         }
2445
2446 void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, unsigned long flags)
2447         {
2448         X509_VERIFY_PARAM_set_flags(ctx->param, flags);
2449         }
2450
2451 void X509_STORE_CTX_set_time(X509_STORE_CTX *ctx, unsigned long flags, time_t t)
2452         {
2453         X509_VERIFY_PARAM_set_time(ctx->param, t);
2454         }
2455
2456 void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx,
2457                                   int (*verify_cb)(int, X509_STORE_CTX *))
2458         {
2459         ctx->verify_cb=verify_cb;
2460         }
2461
2462 X509_POLICY_TREE *X509_STORE_CTX_get0_policy_tree(X509_STORE_CTX *ctx)
2463         {
2464         return ctx->tree;
2465         }
2466
2467 int X509_STORE_CTX_get_explicit_policy(X509_STORE_CTX *ctx)
2468         {
2469         return ctx->explicit_policy;
2470         }
2471
2472 int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name)
2473         {
2474         const X509_VERIFY_PARAM *param;
2475         param = X509_VERIFY_PARAM_lookup(name);
2476         if (!param)
2477                 return 0;
2478         return X509_VERIFY_PARAM_inherit(ctx->param, param);
2479         }
2480
2481 X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx)
2482         {
2483         return ctx->param;
2484         }
2485
2486 void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param)
2487         {
2488         if (ctx->param)
2489                 X509_VERIFY_PARAM_free(ctx->param);
2490         ctx->param = param;
2491         }
2492
2493 IMPLEMENT_STACK_OF(X509)
2494 IMPLEMENT_ASN1_SET_OF(X509)
2495
2496 IMPLEMENT_STACK_OF(X509_NAME)
2497
2498 IMPLEMENT_STACK_OF(X509_ATTRIBUTE)
2499 IMPLEMENT_ASN1_SET_OF(X509_ATTRIBUTE)