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 "x509_lcl.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 static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x);
 123
 124 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
 125                         unsigned int *preasons,
 126                         X509_CRL *crl, X509 *x);
 127 static int get_crl_delta(X509_STORE_CTX *ctx,
 128                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x);
 129 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pcrl_score,
 130                         X509_CRL *base, STACK_OF(X509_CRL) *crls);
 131 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
 132                                 X509 **pissuer, int *pcrl_score);
 133 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
 134                                 unsigned int *preasons);
 135 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x);
 136 static int check_crl_chain(X509_STORE_CTX *ctx,
 137                         STACK_OF(X509) *cert_path,
 138                         STACK_OF(X509) *crl_path);
 139
 140 static int internal_verify(X509_STORE_CTX *ctx);
 141 const char X509_version[]="X.509" OPENSSL_VERSION_PTEXT;
 142
 143
 144 static int null_callback(int ok, X509_STORE_CTX *e)
 145         {
 146         return ok;
 147         }
 148
 149 #if 0
 150 static int x509_subject_cmp(X509 **a, X509 **b)
 151         {
 152         return X509_subject_name_cmp(*a,*b);
 153         }
 154 #endif
 155 /* Return 1 is a certificate is self signed */
 156 static int cert_self_signed(X509 *x)
 157         {
 158         X509_check_purpose(x, -1, 0);
 159         if (x->ex_flags & EXFLAG_SS)
 160                 return 1;
 161         else
 162                 return 0;
 163         }
 164
 165 /* Given a certificate try and find an exact match in the store */
 166
 167 static X509 *lookup_cert_match(X509_STORE_CTX *ctx, X509 *x)
 168         {
 169         STACK_OF(X509) *certs;
 170         X509 *xtmp = NULL;
 171         int i;
 172         /* Lookup all certs with matching subject name */
 173         certs = ctx->lookup_certs(ctx, X509_get_subject_name(x));
 174         if (certs == NULL)
 175                 return NULL;
 176         /* Look for exact match */
 177         for (i = 0; i < sk_X509_num(certs); i++)
 178                 {
 179                 xtmp = sk_X509_value(certs, i);
 180                 if (!X509_cmp(xtmp, x))
 181                         break;
 182                 }
 183         if (i < sk_X509_num(certs))
 184                 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
 185         else
 186                 xtmp = NULL;
 187         sk_X509_pop_free(certs, X509_free);
 188         return xtmp;
 189         }
 190
 191 int X509_verify_cert(X509_STORE_CTX *ctx)
 192         {
 193         X509 *x,*xtmp,*chain_ss=NULL;
 194         int bad_chain = 0;
 195         X509_VERIFY_PARAM *param = ctx->param;
 196         int depth,i,ok=0;
 197         int num;
 198         int (*cb)(int xok,X509_STORE_CTX *xctx);
 199         STACK_OF(X509) *sktmp=NULL;
 200         if (ctx->cert == NULL)
 201                 {
 202                 X509err(X509_F_X509_VERIFY_CERT,X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
 203                 return -1;
 204                 }
 205
 206         cb=ctx->verify_cb;
 207
 208         /* first we make sure the chain we are going to build is
 209          * present and that the first entry is in place */
 210         if (ctx->chain == NULL)
 211                 {
 212                 if (    ((ctx->chain=sk_X509_new_null()) == NULL) ||
 213                         (!sk_X509_push(ctx->chain,ctx->cert)))
 214                         {
 215                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 216                         goto end;
 217                         }
 218                 CRYPTO_add(&ctx->cert->references,1,CRYPTO_LOCK_X509);
 219                 ctx->last_untrusted=1;
 220                 }
 221
 222         /* We use a temporary STACK so we can chop and hack at it */
 223         if (ctx->untrusted != NULL
 224             && (sktmp=sk_X509_dup(ctx->untrusted)) == NULL)
 225                 {
 226                 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 227                 goto end;
 228                 }
 229
 230         num=sk_X509_num(ctx->chain);
 231         x=sk_X509_value(ctx->chain,num-1);
 232         depth=param->depth;
 233
 234
 235         for (;;)
 236                 {
 237                 /* If we have enough, we break */
 238                 if (depth < num) break; /* FIXME: If this happens, we should take
 239                                          * note of it and, if appropriate, use the
 240                                          * X509_V_ERR_CERT_CHAIN_TOO_LONG error
 241                                          * code later.
 242                                          */
 243
 244                 /* If we are self signed, we break */
 245                 if (cert_self_signed(x))
 246                         break;
 247                 /* If asked see if we can find issuer in trusted store first */
 248                 if (ctx->param->flags & X509_V_FLAG_TRUSTED_FIRST)
 249                         {
 250                         ok = ctx->get_issuer(&xtmp, ctx, x);
 251                         if (ok < 0)
 252                                 return ok;
 253                         /* If successful for now free up cert so it
 254                          * will be picked up again later.
 255                          */
 256                         if (ok > 0)
 257                                 {
 258                                 X509_free(xtmp);
 259                                 break;
 260                                 }
 261                         }
 262
 263                 /* If we were passed a cert chain, use it first */
 264                 if (ctx->untrusted != NULL)
 265                         {
 266                         xtmp=find_issuer(ctx, sktmp,x);
 267                         if (xtmp != NULL)
 268                                 {
 269                                 if (!sk_X509_push(ctx->chain,xtmp))
 270                                         {
 271                                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 272                                         goto end;
 273                                         }
 274                                 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
 275                                 (void)sk_X509_delete_ptr(sktmp,xtmp);
 276                                 ctx->last_untrusted++;
 277                                 x=xtmp;
 278                                 num++;
 279                                 /* reparse the full chain for
 280                                  * the next one */
 281                                 continue;
 282                                 }
 283                         }
 284                 break;
 285                 }
 286
 287         /* at this point, chain should contain a list of untrusted
 288          * certificates.  We now need to add at least one trusted one,
 289          * if possible, otherwise we complain. */
 290
 291         /* Examine last certificate in chain and see if it
 292          * is self signed.
 293          */
 294
 295         i=sk_X509_num(ctx->chain);
 296         x=sk_X509_value(ctx->chain,i-1);
 297         if (cert_self_signed(x))
 298                 {
 299                 /* we have a self signed certificate */
 300                 if (sk_X509_num(ctx->chain) == 1)
 301                         {
 302                         /* We have a single self signed certificate: see if
 303                          * we can find it in the store. We must have an exact
 304                          * match to avoid possible impersonation.
 305                          */
 306                         ok = ctx->get_issuer(&xtmp, ctx, x);
 307                         if ((ok <= 0) || X509_cmp(x, xtmp))
 308                                 {
 309                                 ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
 310                                 ctx->current_cert=x;
 311                                 ctx->error_depth=i-1;
 312                                 if (ok == 1) X509_free(xtmp);
 313                                 bad_chain = 1;
 314                                 ok=cb(0,ctx);
 315                                 if (!ok) goto end;
 316                                 }
 317                         else
 318                                 {
 319                                 /* We have a match: replace certificate with store version
 320                                  * so we get any trust settings.
 321                                  */
 322                                 X509_free(x);
 323                                 x = xtmp;
 324                                 (void)sk_X509_set(ctx->chain, i - 1, x);
 325                                 ctx->last_untrusted=0;
 326                                 }
 327                         }
 328                 else
 329                         {
 330                         /* extract and save self signed certificate for later use */
 331                         chain_ss=sk_X509_pop(ctx->chain);
 332                         ctx->last_untrusted--;
 333                         num--;
 334                         x=sk_X509_value(ctx->chain,num-1);
 335                         }
 336                 }
 337
 338         /* We now lookup certs from the certificate store */
 339         for (;;)
 340                 {
 341                 /* If we have enough, we break */
 342                 if (depth < num) break;
 343
 344                 /* If we are self signed, we break */
 345                 if (cert_self_signed(x))
 346                         break;
 347
 348                 ok = ctx->get_issuer(&xtmp, ctx, x);
 349
 350                 if (ok < 0) return ok;
 351                 if (ok == 0) break;
 352
 353                 x = xtmp;
 354                 if (!sk_X509_push(ctx->chain,x))
 355                         {
 356                         X509_free(xtmp);
 357                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
 358                         return 0;
 359                         }
 360                 num++;
 361                 }
 362
 363         /* we now have our chain, lets check it... */
 364
 365         i = check_trust(ctx);
 366
 367         /* If explicitly rejected error */
 368         if (i == X509_TRUST_REJECTED)
 369                 goto end;
 370         /* If not explicitly trusted then indicate error unless it's
 371          * a single self signed certificate in which case we've indicated
 372          * an error already and set bad_chain == 1
 373          */
 374         if (i != X509_TRUST_TRUSTED && !bad_chain)
 375                 {
 376                 if ((chain_ss == NULL) || !ctx->check_issued(ctx, x, chain_ss))
 377                         {
 378                         if (ctx->last_untrusted >= num)
 379                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
 380                         else
 381                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
 382                         ctx->current_cert=x;
 383                         }
 384                 else
 385                         {
 386
 387                         sk_X509_push(ctx->chain,chain_ss);
 388                         num++;
 389                         ctx->last_untrusted=num;
 390                         ctx->current_cert=chain_ss;
 391                         ctx->error=X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
 392                         chain_ss=NULL;
 393                         }
 394
 395                 ctx->error_depth=num-1;
 396                 bad_chain = 1;
 397                 ok=cb(0,ctx);
 398                 if (!ok) goto end;
 399                 }
 400
 401         /* We have the chain complete: now we need to check its purpose */
 402         ok = check_chain_extensions(ctx);
 403
 404         if (!ok) goto end;
 405
 406         /* Check name constraints */
 407
 408         ok = check_name_constraints(ctx);
 409
 410         if (!ok) goto end;
 411
 412         ok = check_id(ctx);
 413
 414         if (!ok) goto end;
 415
 416         /* We may as well copy down any DSA parameters that are required */
 417         X509_get_pubkey_parameters(NULL,ctx->chain);
 418
 419         /* Check revocation status: we do this after copying parameters
 420          * because they may be needed for CRL signature verification.
 421          */
 422
 423         ok = ctx->check_revocation(ctx);
 424         if(!ok) goto end;
 425
 426         i = X509_chain_check_suiteb(&ctx->error_depth, NULL, ctx->chain,
 427                                                         ctx->param->flags);
 428         if (i != X509_V_OK)
 429                 {
 430                 ctx->error = i;
 431                 ctx->current_cert = sk_X509_value(ctx->chain, ctx->error_depth);
 432                 ok = cb(0, ctx);
 433                 if (!ok)
 434                         goto end;
 435                 }
 436
 437         /* At this point, we have a chain and need to verify it */
 438         if (ctx->verify != NULL)
 439                 ok=ctx->verify(ctx);
 440         else
 441                 ok=internal_verify(ctx);
 442         if(!ok) goto end;
 443
 444 #ifndef OPENSSL_NO_RFC3779
 445         /* RFC 3779 path validation, now that CRL check has been done */
 446         ok = v3_asid_validate_path(ctx);
 447         if (!ok) goto end;
 448         ok = v3_addr_validate_path(ctx);
 449         if (!ok) goto end;
 450 #endif
 451
 452         /* If we get this far evaluate policies */
 453         if (!bad_chain && (ctx->param->flags & X509_V_FLAG_POLICY_CHECK))
 454                 ok = ctx->check_policy(ctx);
 455         if(!ok) goto end;
 456         if (0)
 457                 {
 458 end:
 459                 X509_get_pubkey_parameters(NULL,ctx->chain);
 460                 }
 461         if (sktmp != NULL) sk_X509_free(sktmp);
 462         if (chain_ss != NULL) X509_free(chain_ss);
 463         return ok;
 464         }
 465
 466
 467 /* Given a STACK_OF(X509) find the issuer of cert (if any)
 468  */
 469
 470 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x)
 471 {
 472         int i;
 473         X509 *issuer, *rv = NULL;;
 474         for (i = 0; i < sk_X509_num(sk); i++)
 475                 {
 476                 issuer = sk_X509_value(sk, i);
 477                 if (ctx->check_issued(ctx, x, issuer))
 478                         {
 479                         rv = issuer;
 480                         if (x509_check_cert_time(ctx, rv, 1))
 481                                 break;
 482                         }
 483                 }
 484         return rv;
 485 }
 486
 487 /* Given a possible certificate and issuer check them */
 488
 489 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer)
 490 {
 491         int ret;
 492         if (x == issuer)
 493                 return cert_self_signed(x);
 494         ret = X509_check_issued(issuer, x);
 495         if (ret == X509_V_OK)
 496                 {
 497                 int i;
 498                 X509 *ch;
 499                 /* Special case: single self signed certificate */
 500                 if (cert_self_signed(x) && sk_X509_num(ctx->chain) == 1)
 501                         return 1;
 502                 for (i = 0; i < sk_X509_num(ctx->chain); i++)
 503                         {
 504                         ch = sk_X509_value(ctx->chain, i);
 505                         if (ch == issuer || !X509_cmp(ch, issuer))
 506                                 {
 507                                 ret = X509_V_ERR_PATH_LOOP;
 508                                 break;
 509                                 }
 510                         }
 511                 }
 512
 513         if (ret == X509_V_OK)
 514                 return 1;
 515         /* If we haven't asked for issuer errors don't set ctx */
 516         if (!(ctx->param->flags & X509_V_FLAG_CB_ISSUER_CHECK))
 517                 return 0;
 518
 519         ctx->error = ret;
 520         ctx->current_cert = x;
 521         ctx->current_issuer = issuer;
 522         return ctx->verify_cb(0, ctx);
 523 }
 524
 525 /* Alternative lookup method: look from a STACK stored in other_ctx */
 526
 527 static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
 528 {
 529         *issuer = find_issuer(ctx, ctx->other_ctx, x);
 530         if (*issuer)
 531                 {
 532                 CRYPTO_add(&(*issuer)->references,1,CRYPTO_LOCK_X509);
 533                 return 1;
 534                 }
 535         else
 536                 return 0;
 537 }
 538
 539
 540 /* Check a certificate chains extensions for consistency
 541  * with the supplied purpose
 542  */
 543
 544 static int check_chain_extensions(X509_STORE_CTX *ctx)
 545 {
 546 #ifdef OPENSSL_NO_CHAIN_VERIFY
 547         return 1;
 548 #else
 549         int i, ok=0, must_be_ca, plen = 0;
 550         X509 *x;
 551         int (*cb)(int xok,X509_STORE_CTX *xctx);
 552         int proxy_path_length = 0;
 553         int purpose;
 554         int allow_proxy_certs;
 555         cb=ctx->verify_cb;
 556
 557         /* must_be_ca can have 1 of 3 values:
 558            -1: we accept both CA and non-CA certificates, to allow direct
 559                use of self-signed certificates (which are marked as CA).
 560            0:  we only accept non-CA certificates.  This is currently not
 561                used, but the possibility is present for future extensions.
 562            1:  we only accept CA certificates.  This is currently used for
 563                all certificates in the chain except the leaf certificate.
 564         */
 565         must_be_ca = -1;
 566
 567         /* CRL path validation */
 568         if (ctx->parent)
 569                 {
 570                 allow_proxy_certs = 0;
 571                 purpose = X509_PURPOSE_CRL_SIGN;
 572                 }
 573         else
 574                 {
 575                 allow_proxy_certs =
 576                         !!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
 577                 /* A hack to keep people who don't want to modify their
 578                    software happy */
 579                 if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
 580                         allow_proxy_certs = 1;
 581                 purpose = ctx->param->purpose;
 582                 }
 583
 584         /* Check all untrusted certificates */
 585         for (i = 0; i < ctx->last_untrusted; i++)
 586                 {
 587                 int ret;
 588                 x = sk_X509_value(ctx->chain, i);
 589                 if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
 590                         && (x->ex_flags & EXFLAG_CRITICAL))
 591                         {
 592                         ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;
 593                         ctx->error_depth = i;
 594                         ctx->current_cert = x;
 595                         ok=cb(0,ctx);
 596                         if (!ok) goto end;
 597                         }
 598                 if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY))
 599                         {
 600                         ctx->error = X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED;
 601                         ctx->error_depth = i;
 602                         ctx->current_cert = x;
 603                         ok=cb(0,ctx);
 604                         if (!ok) goto end;
 605                         }
 606                 ret = X509_check_ca(x);
 607                 switch(must_be_ca)
 608                         {
 609                 case -1:
 610                         if ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 611                                 && (ret != 1) && (ret != 0))
 612                                 {
 613                                 ret = 0;
 614                                 ctx->error = X509_V_ERR_INVALID_CA;
 615                                 }
 616                         else
 617                                 ret = 1;
 618                         break;
 619                 case 0:
 620                         if (ret != 0)
 621                                 {
 622                                 ret = 0;
 623                                 ctx->error = X509_V_ERR_INVALID_NON_CA;
 624                                 }
 625                         else
 626                                 ret = 1;
 627                         break;
 628                 default:
 629                         if ((ret == 0)
 630                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 631                                         && (ret != 1)))
 632                                 {
 633                                 ret = 0;
 634                                 ctx->error = X509_V_ERR_INVALID_CA;
 635                                 }
 636                         else
 637                                 ret = 1;
 638                         break;
 639                         }
 640                 if (ret == 0)
 641                         {
 642                         ctx->error_depth = i;
 643                         ctx->current_cert = x;
 644                         ok=cb(0,ctx);
 645                         if (!ok) goto end;
 646                         }
 647                 if (ctx->param->purpose > 0)
 648                         {
 649                         ret = X509_check_purpose(x, purpose, must_be_ca > 0);
 650                         if ((ret == 0)
 651                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
 652                                         && (ret != 1)))
 653                                 {
 654                                 ctx->error = X509_V_ERR_INVALID_PURPOSE;
 655                                 ctx->error_depth = i;
 656                                 ctx->current_cert = x;
 657                                 ok=cb(0,ctx);
 658                                 if (!ok) goto end;
 659                                 }
 660                         }
 661                 /* Check pathlen if not self issued */
 662                 if ((i > 1) && !(x->ex_flags & EXFLAG_SI)
 663                            && (x->ex_pathlen != -1)
 664                            && (plen > (x->ex_pathlen + proxy_path_length + 1)))
 665                         {
 666                         ctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;
 667                         ctx->error_depth = i;
 668                         ctx->current_cert = x;
 669                         ok=cb(0,ctx);
 670                         if (!ok) goto end;
 671                         }
 672                 /* Increment path length if not self issued */
 673                 if (!(x->ex_flags & EXFLAG_SI))
 674                         plen++;
 675                 /* If this certificate is a proxy certificate, the next
 676                    certificate must be another proxy certificate or a EE
 677                    certificate.  If not, the next certificate must be a
 678                    CA certificate.  */
 679                 if (x->ex_flags & EXFLAG_PROXY)
 680                         {
 681                         if (x->ex_pcpathlen != -1 && i > x->ex_pcpathlen)
 682                                 {
 683                                 ctx->error =
 684                                         X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED;
 685                                 ctx->error_depth = i;
 686                                 ctx->current_cert = x;
 687                                 ok=cb(0,ctx);
 688                                 if (!ok) goto end;
 689                                 }
 690                         proxy_path_length++;
 691                         must_be_ca = 0;
 692                         }
 693                 else
 694                         must_be_ca = 1;
 695                 }
 696         ok = 1;
 697  end:
 698         return ok;
 699 #endif
 700 }
 701
 702 static int check_name_constraints(X509_STORE_CTX *ctx)
 703         {
 704         X509 *x;
 705         int i, j, rv;
 706         /* Check name constraints for all certificates */
 707         for (i = sk_X509_num(ctx->chain) - 1; i >= 0; i--)
 708                 {
 709                 x = sk_X509_value(ctx->chain, i);
 710                 /* Ignore self issued certs unless last in chain */
 711                 if (i && (x->ex_flags & EXFLAG_SI))
 712                         continue;
 713                 /* Check against constraints for all certificates higher in
 714                  * chain including trust anchor. Trust anchor not strictly
 715                  * speaking needed but if it includes constraints it is to be
 716                  * assumed it expects them to be obeyed.
 717                  */
 718                 for (j = sk_X509_num(ctx->chain) - 1; j > i; j--)
 719                         {
 720                         NAME_CONSTRAINTS *nc = sk_X509_value(ctx->chain, j)->nc;
 721                         if (nc)
 722                                 {
 723                                 rv = NAME_CONSTRAINTS_check(x, nc);
 724                                 if (rv != X509_V_OK)
 725                                         {
 726                                         ctx->error = rv;
 727                                         ctx->error_depth = i;
 728                                         ctx->current_cert = x;
 729                                         if (!ctx->verify_cb(0,ctx))
 730                                                 return 0;
 731                                         }
 732                                 }
 733                         }
 734                 }
 735         return 1;
 736         }
 737
 738 static int check_id_error(X509_STORE_CTX *ctx, int errcode)
 739         {
 740         ctx->error = errcode;
 741         ctx->current_cert = ctx->cert;
 742         ctx->error_depth = 0;
 743         return ctx->verify_cb(0, ctx);
 744         }
 745
 746 static int check_hosts(X509 *x, X509_VERIFY_PARAM_ID *id)
 747         {
 748         int i;
 749         int n = sk_OPENSSL_STRING_num(id->hosts);
 750         char *name;
 751
 752         for (i = 0; i < n; ++i)
 753                 {
 754                 name = sk_OPENSSL_STRING_value(id->hosts, i);
 755                 if (X509_check_host(x, name, 0, id->hostflags,
 756                                     &id->peername) > 0)
 757                         return 1;
 758                 }
 759         return n == 0;
 760         }
 761
 762 static int check_id(X509_STORE_CTX *ctx)
 763         {
 764         X509_VERIFY_PARAM *vpm = ctx->param;
 765         X509_VERIFY_PARAM_ID *id = vpm->id;
 766         X509 *x = ctx->cert;
 767         if (id->hosts && check_hosts(x, id) <= 0)
 768                 {
 769                 if (!check_id_error(ctx, X509_V_ERR_HOSTNAME_MISMATCH))
 770                         return 0;
 771                 }
 772         if (id->email && X509_check_email(x, id->email, id->emaillen, 0) <= 0)
 773                 {
 774                 if (!check_id_error(ctx, X509_V_ERR_EMAIL_MISMATCH))
 775                         return 0;
 776                 }
 777         if (id->ip && X509_check_ip(x, id->ip, id->iplen, 0) <= 0)
 778                 {
 779                 if (!check_id_error(ctx, X509_V_ERR_IP_ADDRESS_MISMATCH))
 780                         return 0;
 781                 }
 782         return 1;
 783         }
 784
 785 static int check_trust(X509_STORE_CTX *ctx)
 786 {
 787         int i, ok;
 788         X509 *x = NULL;
 789         int (*cb)(int xok,X509_STORE_CTX *xctx);
 790         cb=ctx->verify_cb;
 791         /* Check all trusted certificates in chain */
 792         for (i = ctx->last_untrusted; i < sk_X509_num(ctx->chain); i++)
 793                 {
 794                 x = sk_X509_value(ctx->chain, i);
 795                 ok = X509_check_trust(x, ctx->param->trust, 0);
 796                 /* If explicitly trusted return trusted */
 797                 if (ok == X509_TRUST_TRUSTED)
 798                         return X509_TRUST_TRUSTED;
 799                 /* If explicitly rejected notify callback and reject if
 800                  * not overridden.
 801                  */
 802                 if (ok == X509_TRUST_REJECTED)
 803                         {
 804                         ctx->error_depth = i;
 805                         ctx->current_cert = x;
 806                         ctx->error = X509_V_ERR_CERT_REJECTED;
 807                         ok = cb(0, ctx);
 808                         if (!ok)
 809                                 return X509_TRUST_REJECTED;
 810                         }
 811                 }
 812         /* If we accept partial chains and have at least one trusted
 813          * certificate return success.
 814          */
 815         if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN)
 816                 {
 817                 X509 *mx;
 818                 if (ctx->last_untrusted < sk_X509_num(ctx->chain))
 819                         return X509_TRUST_TRUSTED;
 820                 x = sk_X509_value(ctx->chain, 0);
 821                 mx = lookup_cert_match(ctx, x);
 822                 if (mx)
 823                         {
 824                         (void)sk_X509_set(ctx->chain, 0, mx);
 825                         X509_free(x);
 826                         ctx->last_untrusted = 0;
 827                         return X509_TRUST_TRUSTED;
 828                         }
 829                 }
 830
 831         /* If no trusted certs in chain at all return untrusted and
 832          * allow standard (no issuer cert) etc errors to be indicated.
 833          */
 834         return X509_TRUST_UNTRUSTED;
 835 }
 836
 837 static int check_revocation(X509_STORE_CTX *ctx)
 838         {
 839         int i, last, ok;
 840         if (!(ctx->param->flags & X509_V_FLAG_CRL_CHECK))
 841                 return 1;
 842         if (ctx->param->flags & X509_V_FLAG_CRL_CHECK_ALL)
 843                 last = sk_X509_num(ctx->chain) - 1;
 844         else
 845                 {
 846                 /* If checking CRL paths this isn't the EE certificate */
 847                 if (ctx->parent)
 848                         return 1;
 849                 last = 0;
 850                 }
 851         for(i = 0; i <= last; i++)
 852                 {
 853                 ctx->error_depth = i;
 854                 ok = check_cert(ctx);
 855                 if (!ok) return ok;
 856                 }
 857         return 1;
 858         }
 859
 860 static int check_cert(X509_STORE_CTX *ctx)
 861         {
 862         X509_CRL *crl = NULL, *dcrl = NULL;
 863         X509 *x;
 864         int ok, cnum;
 865         unsigned int last_reasons;
 866         cnum = ctx->error_depth;
 867         x = sk_X509_value(ctx->chain, cnum);
 868         ctx->current_cert = x;
 869         ctx->current_issuer = NULL;
 870         ctx->current_crl_score = 0;
 871         ctx->current_reasons = 0;
 872         while (ctx->current_reasons != CRLDP_ALL_REASONS)
 873                 {
 874                 last_reasons = ctx->current_reasons;
 875                 /* Try to retrieve relevant CRL */
 876                 if (ctx->get_crl)
 877                         ok = ctx->get_crl(ctx, &crl, x);
 878                 else
 879                         ok = get_crl_delta(ctx, &crl, &dcrl, x);
 880                 /* If error looking up CRL, nothing we can do except
 881                  * notify callback
 882                  */
 883                 if(!ok)
 884                         {
 885                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
 886                         ok = ctx->verify_cb(0, ctx);
 887                         goto err;
 888                         }
 889                 ctx->current_crl = crl;
 890                 ok = ctx->check_crl(ctx, crl);
 891                 if (!ok)
 892                         goto err;
 893
 894                 if (dcrl)
 895                         {
 896                         ok = ctx->check_crl(ctx, dcrl);
 897                         if (!ok)
 898                                 goto err;
 899                         ok = ctx->cert_crl(ctx, dcrl, x);
 900                         if (!ok)
 901                                 goto err;
 902                         }
 903                 else
 904                         ok = 1;
 905
 906                 /* Don't look in full CRL if delta reason is removefromCRL */
 907                 if (ok != 2)
 908                         {
 909                         ok = ctx->cert_crl(ctx, crl, x);
 910                         if (!ok)
 911                                 goto err;
 912                         }
 913
 914                 X509_CRL_free(crl);
 915                 X509_CRL_free(dcrl);
 916                 crl = NULL;
 917                 dcrl = NULL;
 918                 /* If reasons not updated we wont get anywhere by
 919                  * another iteration, so exit loop.
 920                  */
 921                 if (last_reasons == ctx->current_reasons)
 922                         {
 923                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
 924                         ok = ctx->verify_cb(0, ctx);
 925                         goto err;
 926                         }
 927                 }
 928         err:
 929         X509_CRL_free(crl);
 930         X509_CRL_free(dcrl);
 931
 932         ctx->current_crl = NULL;
 933         return ok;
 934
 935         }
 936
 937 /* Check CRL times against values in X509_STORE_CTX */
 938
 939 static int check_crl_time(X509_STORE_CTX *ctx, X509_CRL *crl, int notify)
 940         {
 941         time_t *ptime;
 942         int i;
 943         if (notify)
 944                 ctx->current_crl = crl;
 945         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
 946                 ptime = &ctx->param->check_time;
 947         else
 948                 ptime = NULL;
 949
 950         i=X509_cmp_time(X509_CRL_get_lastUpdate(crl), ptime);
 951         if (i == 0)
 952                 {
 953                 if (!notify)
 954                         return 0;
 955                 ctx->error=X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD;
 956                 if (!ctx->verify_cb(0, ctx))
 957                         return 0;
 958                 }
 959
 960         if (i > 0)
 961                 {
 962                 if (!notify)
 963                         return 0;
 964                 ctx->error=X509_V_ERR_CRL_NOT_YET_VALID;
 965                 if (!ctx->verify_cb(0, ctx))
 966                         return 0;
 967                 }
 968
 969         if(X509_CRL_get_nextUpdate(crl))
 970                 {
 971                 i=X509_cmp_time(X509_CRL_get_nextUpdate(crl), ptime);
 972
 973                 if (i == 0)
 974                         {
 975                         if (!notify)
 976                                 return 0;
 977                         ctx->error=X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD;
 978                         if (!ctx->verify_cb(0, ctx))
 979                                 return 0;
 980                         }
 981                 /* Ignore expiry of base CRL is delta is valid */
 982                 if ((i < 0) && !(ctx->current_crl_score & CRL_SCORE_TIME_DELTA))
 983                         {
 984                         if (!notify)
 985                                 return 0;
 986                         ctx->error=X509_V_ERR_CRL_HAS_EXPIRED;
 987                         if (!ctx->verify_cb(0, ctx))
 988                                 return 0;
 989                         }
 990                 }
 991
 992         if (notify)
 993                 ctx->current_crl = NULL;
 994
 995         return 1;
 996         }
 997
 998 static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl,
 999                         X509 **pissuer, int *pscore, unsigned int *preasons,
1000                         STACK_OF(X509_CRL) *crls)
1001         {
1002         int i, crl_score, best_score = *pscore;
1003         unsigned int reasons, best_reasons = 0;
1004         X509 *x = ctx->current_cert;
1005         X509_CRL *crl, *best_crl = NULL;
1006         X509 *crl_issuer = NULL, *best_crl_issuer = NULL;
1007
1008         for (i = 0; i < sk_X509_CRL_num(crls); i++)
1009                 {
1010                 crl = sk_X509_CRL_value(crls, i);
1011                 reasons = *preasons;
1012                 crl_score = get_crl_score(ctx, &crl_issuer, &reasons, crl, x);
1013
1014                 if (crl_score > best_score)
1015                         {
1016                         best_crl = crl;
1017                         best_crl_issuer = crl_issuer;
1018                         best_score = crl_score;
1019                         best_reasons = reasons;
1020                         }
1021                 }
1022
1023         if (best_crl)
1024                 {
1025                 if (*pcrl)
1026                         X509_CRL_free(*pcrl);
1027                 *pcrl = best_crl;
1028                 *pissuer = best_crl_issuer;
1029                 *pscore = best_score;
1030                 *preasons = best_reasons;
1031                 CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509_CRL);
1032                 if (*pdcrl)
1033                         {
1034                         X509_CRL_free(*pdcrl);
1035                         *pdcrl = NULL;
1036                         }
1037                 get_delta_sk(ctx, pdcrl, pscore, best_crl, crls);
1038                 }
1039
1040         if (best_score >= CRL_SCORE_VALID)
1041                 return 1;
1042
1043         return 0;
1044         }
1045
1046 /* Compare two CRL extensions for delta checking purposes. They should be
1047  * both present or both absent. If both present all fields must be identical.
1048  */
1049
1050 static int crl_extension_match(X509_CRL *a, X509_CRL *b, int nid)
1051         {
1052         ASN1_OCTET_STRING *exta, *extb;
1053         int i;
1054         i = X509_CRL_get_ext_by_NID(a, nid, -1);
1055         if (i >= 0)
1056                 {
1057                 /* Can't have multiple occurrences */
1058                 if (X509_CRL_get_ext_by_NID(a, nid, i) != -1)
1059                         return 0;
1060                 exta = X509_EXTENSION_get_data(X509_CRL_get_ext(a, i));
1061                 }
1062         else
1063                 exta = NULL;
1064
1065         i = X509_CRL_get_ext_by_NID(b, nid, -1);
1066
1067         if (i >= 0)
1068                 {
1069
1070                 if (X509_CRL_get_ext_by_NID(b, nid, i) != -1)
1071                         return 0;
1072                 extb = X509_EXTENSION_get_data(X509_CRL_get_ext(b, i));
1073                 }
1074         else
1075                 extb = NULL;
1076
1077         if (!exta && !extb)
1078                 return 1;
1079
1080         if (!exta || !extb)
1081                 return 0;
1082
1083
1084         if (ASN1_OCTET_STRING_cmp(exta, extb))
1085                 return 0;
1086
1087         return 1;
1088         }
1089
1090 /* See if a base and delta are compatible */
1091
1092 static int check_delta_base(X509_CRL *delta, X509_CRL *base)
1093         {
1094         /* Delta CRL must be a delta */
1095         if (!delta->base_crl_number)
1096                         return 0;
1097         /* Base must have a CRL number */
1098         if (!base->crl_number)
1099                         return 0;
1100         /* Issuer names must match */
1101         if (X509_NAME_cmp(X509_CRL_get_issuer(base),
1102                                 X509_CRL_get_issuer(delta)))
1103                 return 0;
1104         /* AKID and IDP must match */
1105         if (!crl_extension_match(delta, base, NID_authority_key_identifier))
1106                         return 0;
1107         if (!crl_extension_match(delta, base, NID_issuing_distribution_point))
1108                         return 0;
1109         /* Delta CRL base number must not exceed Full CRL number. */
1110         if (ASN1_INTEGER_cmp(delta->base_crl_number, base->crl_number) > 0)
1111                         return 0;
1112         /* Delta CRL number must exceed full CRL number */
1113         if (ASN1_INTEGER_cmp(delta->crl_number, base->crl_number) > 0)
1114                         return 1;
1115         return 0;
1116         }
1117
1118 /* For a given base CRL find a delta... maybe extend to delta scoring
1119  * or retrieve a chain of deltas...
1120  */
1121
1122 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pscore,
1123                         X509_CRL *base, STACK_OF(X509_CRL) *crls)
1124         {
1125         X509_CRL *delta;
1126         int i;
1127         if (!(ctx->param->flags & X509_V_FLAG_USE_DELTAS))
1128                 return;
1129         if (!((ctx->current_cert->ex_flags | base->flags) & EXFLAG_FRESHEST))
1130                 return;
1131         for (i = 0; i < sk_X509_CRL_num(crls); i++)
1132                 {
1133                 delta = sk_X509_CRL_value(crls, i);
1134                 if (check_delta_base(delta, base))
1135                         {
1136                         if (check_crl_time(ctx, delta, 0))
1137                                 *pscore |= CRL_SCORE_TIME_DELTA;
1138                         CRYPTO_add(&delta->references, 1, CRYPTO_LOCK_X509_CRL);
1139                         *dcrl = delta;
1140                         return;
1141                         }
1142                 }
1143         *dcrl = NULL;
1144         }
1145
1146 /* For a given CRL return how suitable it is for the supplied certificate 'x'.
1147  * The return value is a mask of several criteria.
1148  * If the issuer is not the certificate issuer this is returned in *pissuer.
1149  * The reasons mask is also used to determine if the CRL is suitable: if
1150  * no new reasons the CRL is rejected, otherwise reasons is updated.
1151  */
1152
1153 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
1154                         unsigned int *preasons,
1155                         X509_CRL *crl, X509 *x)
1156         {
1157
1158         int crl_score = 0;
1159         unsigned int tmp_reasons = *preasons, crl_reasons;
1160
1161         /* First see if we can reject CRL straight away */
1162
1163         /* Invalid IDP cannot be processed */
1164         if (crl->idp_flags & IDP_INVALID)
1165                 return 0;
1166         /* Reason codes or indirect CRLs need extended CRL support */
1167         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1168                 {
1169                 if (crl->idp_flags & (IDP_INDIRECT | IDP_REASONS))
1170                         return 0;
1171                 }
1172         else if (crl->idp_flags & IDP_REASONS)
1173                 {
1174                 /* If no new reasons reject */
1175                 if (!(crl->idp_reasons & ~tmp_reasons))
1176                         return 0;
1177                 }
1178         /* Don't process deltas at this stage */
1179         else if (crl->base_crl_number)
1180                 return 0;
1181         /* If issuer name doesn't match certificate need indirect CRL */
1182         if (X509_NAME_cmp(X509_get_issuer_name(x), X509_CRL_get_issuer(crl)))
1183                 {
1184                 if (!(crl->idp_flags & IDP_INDIRECT))
1185                         return 0;
1186                 }
1187         else
1188                 crl_score |= CRL_SCORE_ISSUER_NAME;
1189
1190         if (!(crl->flags & EXFLAG_CRITICAL))
1191                 crl_score |= CRL_SCORE_NOCRITICAL;
1192
1193         /* Check expiry */
1194         if (check_crl_time(ctx, crl, 0))
1195                 crl_score |= CRL_SCORE_TIME;
1196
1197         /* Check authority key ID and locate certificate issuer */
1198         crl_akid_check(ctx, crl, pissuer, &crl_score);
1199
1200         /* If we can't locate certificate issuer at this point forget it */
1201
1202         if (!(crl_score & CRL_SCORE_AKID))
1203                 return 0;
1204
1205         /* Check cert for matching CRL distribution points */
1206
1207         if (crl_crldp_check(x, crl, crl_score, &crl_reasons))
1208                 {
1209                 /* If no new reasons reject */
1210                 if (!(crl_reasons & ~tmp_reasons))
1211                         return 0;
1212                 tmp_reasons |= crl_reasons;
1213                 crl_score |= CRL_SCORE_SCOPE;
1214                 }
1215
1216         *preasons = tmp_reasons;
1217
1218         return crl_score;
1219
1220         }
1221
1222 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
1223                                 X509 **pissuer, int *pcrl_score)
1224         {
1225         X509 *crl_issuer = NULL;
1226         X509_NAME *cnm = X509_CRL_get_issuer(crl);
1227         int cidx = ctx->error_depth;
1228         int i;
1229
1230         if (cidx != sk_X509_num(ctx->chain) - 1)
1231                 cidx++;
1232
1233         crl_issuer = sk_X509_value(ctx->chain, cidx);
1234
1235         if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1236                 {
1237                 if (*pcrl_score & CRL_SCORE_ISSUER_NAME)
1238                         {
1239                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_ISSUER_CERT;
1240                         *pissuer = crl_issuer;
1241                         return;
1242                         }
1243                 }
1244
1245         for (cidx++; cidx < sk_X509_num(ctx->chain); cidx++)
1246                 {
1247                 crl_issuer = sk_X509_value(ctx->chain, cidx);
1248                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1249                         continue;
1250                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1251                         {
1252                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_SAME_PATH;
1253                         *pissuer = crl_issuer;
1254                         return;
1255                         }
1256                 }
1257
1258         /* Anything else needs extended CRL support */
1259
1260         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1261                 return;
1262
1263         /* Otherwise the CRL issuer is not on the path. Look for it in the
1264          * set of untrusted certificates.
1265          */
1266         for (i = 0; i < sk_X509_num(ctx->untrusted); i++)
1267                 {
1268                 crl_issuer = sk_X509_value(ctx->untrusted, i);
1269                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1270                         continue;
1271                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1272                         {
1273                         *pissuer = crl_issuer;
1274                         *pcrl_score |= CRL_SCORE_AKID;
1275                         return;
1276                         }
1277                 }
1278         }
1279
1280 /* Check the path of a CRL issuer certificate. This creates a new
1281  * X509_STORE_CTX and populates it with most of the parameters from the
1282  * parent. This could be optimised somewhat since a lot of path checking
1283  * will be duplicated by the parent, but this will rarely be used in
1284  * practice.
1285  */
1286
1287 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x)
1288         {
1289         X509_STORE_CTX crl_ctx;
1290         int ret;
1291         /* Don't allow recursive CRL path validation */
1292         if (ctx->parent)
1293                 return 0;
1294         if (!X509_STORE_CTX_init(&crl_ctx, ctx->ctx, x, ctx->untrusted))
1295                 return -1;
1296
1297         crl_ctx.crls = ctx->crls;
1298         /* Copy verify params across */
1299         X509_STORE_CTX_set0_param(&crl_ctx, ctx->param);
1300
1301         crl_ctx.parent = ctx;
1302         crl_ctx.verify_cb = ctx->verify_cb;
1303
1304         /* Verify CRL issuer */
1305         ret = X509_verify_cert(&crl_ctx);
1306
1307         if (ret <= 0)
1308                 goto err;
1309
1310         /* Check chain is acceptable */
1311
1312         ret = check_crl_chain(ctx, ctx->chain, crl_ctx.chain);
1313         err:
1314         X509_STORE_CTX_cleanup(&crl_ctx);
1315         return ret;
1316         }
1317
1318 /* RFC3280 says nothing about the relationship between CRL path
1319  * and certificate path, which could lead to situations where a
1320  * certificate could be revoked or validated by a CA not authorised
1321  * to do so. RFC5280 is more strict and states that the two paths must
1322  * end in the same trust anchor, though some discussions remain...
1323  * until this is resolved we use the RFC5280 version
1324  */
1325
1326 static int check_crl_chain(X509_STORE_CTX *ctx,
1327                         STACK_OF(X509) *cert_path,
1328                         STACK_OF(X509) *crl_path)
1329         {
1330         X509 *cert_ta, *crl_ta;
1331         cert_ta = sk_X509_value(cert_path, sk_X509_num(cert_path) - 1);
1332         crl_ta = sk_X509_value(crl_path, sk_X509_num(crl_path) - 1);
1333         if (!X509_cmp(cert_ta, crl_ta))
1334                 return 1;
1335         return 0;
1336         }
1337
1338 /* Check for match between two dist point names: three separate cases.
1339  * 1. Both are relative names and compare X509_NAME types.
1340  * 2. One full, one relative. Compare X509_NAME to GENERAL_NAMES.
1341  * 3. Both are full names and compare two GENERAL_NAMES.
1342  * 4. One is NULL: automatic match.
1343  */
1344
1345
1346 static int idp_check_dp(DIST_POINT_NAME *a, DIST_POINT_NAME *b)
1347         {
1348         X509_NAME *nm = NULL;
1349         GENERAL_NAMES *gens = NULL;
1350         GENERAL_NAME *gena, *genb;
1351         int i, j;
1352         if (!a || !b)
1353                 return 1;
1354         if (a->type == 1)
1355                 {
1356                 if (!a->dpname)
1357                         return 0;
1358                 /* Case 1: two X509_NAME */
1359                 if (b->type == 1)
1360                         {
1361                         if (!b->dpname)
1362                                 return 0;
1363                         if (!X509_NAME_cmp(a->dpname, b->dpname))
1364                                 return 1;
1365                         else
1366                                 return 0;
1367                         }
1368                 /* Case 2: set name and GENERAL_NAMES appropriately */
1369                 nm = a->dpname;
1370                 gens = b->name.fullname;
1371                 }
1372         else if (b->type == 1)
1373                 {
1374                 if (!b->dpname)
1375                         return 0;
1376                 /* Case 2: set name and GENERAL_NAMES appropriately */
1377                 gens = a->name.fullname;
1378                 nm = b->dpname;
1379                 }
1380
1381         /* Handle case 2 with one GENERAL_NAMES and one X509_NAME */
1382         if (nm)
1383                 {
1384                 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++)
1385                         {
1386                         gena = sk_GENERAL_NAME_value(gens, i);
1387                         if (gena->type != GEN_DIRNAME)
1388                                 continue;
1389                         if (!X509_NAME_cmp(nm, gena->d.directoryName))
1390                                 return 1;
1391                         }
1392                 return 0;
1393                 }
1394
1395         /* Else case 3: two GENERAL_NAMES */
1396
1397         for (i = 0; i < sk_GENERAL_NAME_num(a->name.fullname); i++)
1398                 {
1399                 gena = sk_GENERAL_NAME_value(a->name.fullname, i);
1400                 for (j = 0; j < sk_GENERAL_NAME_num(b->name.fullname); j++)
1401                         {
1402                         genb = sk_GENERAL_NAME_value(b->name.fullname, j);
1403                         if (!GENERAL_NAME_cmp(gena, genb))
1404                                 return 1;
1405                         }
1406                 }
1407
1408         return 0;
1409
1410         }
1411
1412 static int crldp_check_crlissuer(DIST_POINT *dp, X509_CRL *crl, int crl_score)
1413         {
1414         int i;
1415         X509_NAME *nm = X509_CRL_get_issuer(crl);
1416         /* If no CRLissuer return is successful iff don't need a match */
1417         if (!dp->CRLissuer)
1418                 return !!(crl_score & CRL_SCORE_ISSUER_NAME);
1419         for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++)
1420                 {
1421                 GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
1422                 if (gen->type != GEN_DIRNAME)
1423                         continue;
1424                 if (!X509_NAME_cmp(gen->d.directoryName, nm))
1425                         return 1;
1426                 }
1427         return 0;
1428         }
1429
1430 /* Check CRLDP and IDP */
1431
1432 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
1433                                 unsigned int *preasons)
1434         {
1435         int i;
1436         if (crl->idp_flags & IDP_ONLYATTR)
1437                 return 0;
1438         if (x->ex_flags & EXFLAG_CA)
1439                 {
1440                 if (crl->idp_flags & IDP_ONLYUSER)
1441                         return 0;
1442                 }
1443         else
1444                 {
1445                 if (crl->idp_flags & IDP_ONLYCA)
1446                         return 0;
1447                 }
1448         *preasons = crl->idp_reasons;
1449         for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++)
1450                 {
1451                 DIST_POINT *dp = sk_DIST_POINT_value(x->crldp, i);
1452                 if (crldp_check_crlissuer(dp, crl, crl_score))
1453                         {
1454                         if (!crl->idp ||
1455                              idp_check_dp(dp->distpoint, crl->idp->distpoint))
1456                                 {
1457                                 *preasons &= dp->dp_reasons;
1458                                 return 1;
1459                                 }
1460                         }
1461                 }
1462         if ((!crl->idp || !crl->idp->distpoint) && (crl_score & CRL_SCORE_ISSUER_NAME))
1463                 return 1;
1464         return 0;
1465         }
1466
1467 /* Retrieve CRL corresponding to current certificate.
1468  * If deltas enabled try to find a delta CRL too
1469  */
1470
1471 static int get_crl_delta(X509_STORE_CTX *ctx,
1472                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)
1473         {
1474         int ok;
1475         X509 *issuer = NULL;
1476         int crl_score = 0;
1477         unsigned int reasons;
1478         X509_CRL *crl = NULL, *dcrl = NULL;
1479         STACK_OF(X509_CRL) *skcrl;
1480         X509_NAME *nm = X509_get_issuer_name(x);
1481         reasons = ctx->current_reasons;
1482         ok = get_crl_sk(ctx, &crl, &dcrl,
1483                                 &issuer, &crl_score, &reasons, ctx->crls);
1484
1485         if (ok)
1486                 goto done;
1487
1488         /* Lookup CRLs from store */
1489
1490         skcrl = ctx->lookup_crls(ctx, nm);
1491
1492         /* If no CRLs found and a near match from get_crl_sk use that */
1493         if (!skcrl && crl)
1494                 goto done;
1495
1496         get_crl_sk(ctx, &crl, &dcrl, &issuer, &crl_score, &reasons, skcrl);
1497
1498         sk_X509_CRL_pop_free(skcrl, X509_CRL_free);
1499
1500         done:
1501
1502         /* If we got any kind of CRL use it and return success */
1503         if (crl)
1504                 {
1505                 ctx->current_issuer = issuer;
1506                 ctx->current_crl_score = crl_score;
1507                 ctx->current_reasons = reasons;
1508                 *pcrl = crl;
1509                 *pdcrl = dcrl;
1510                 return 1;
1511                 }
1512
1513         return 0;
1514         }
1515
1516 /* Check CRL validity */
1517 static int check_crl(X509_STORE_CTX *ctx, X509_CRL *crl)
1518         {
1519         X509 *issuer = NULL;
1520         EVP_PKEY *ikey = NULL;
1521         int ok = 0, chnum, cnum;
1522         cnum = ctx->error_depth;
1523         chnum = sk_X509_num(ctx->chain) - 1;
1524         /* if we have an alternative CRL issuer cert use that */
1525         if (ctx->current_issuer)
1526                 issuer = ctx->current_issuer;
1527
1528         /* Else find CRL issuer: if not last certificate then issuer
1529          * is next certificate in chain.
1530          */
1531         else if (cnum < chnum)
1532                 issuer = sk_X509_value(ctx->chain, cnum + 1);
1533         else
1534                 {
1535                 issuer = sk_X509_value(ctx->chain, chnum);
1536                 /* If not self signed, can't check signature */
1537                 if(!ctx->check_issued(ctx, issuer, issuer))
1538                         {
1539                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER;
1540                         ok = ctx->verify_cb(0, ctx);
1541                         if(!ok) goto err;
1542                         }
1543                 }
1544
1545         if(issuer)
1546                 {
1547                 /* Skip most tests for deltas because they have already
1548                  * been done
1549                  */
1550                 if (!crl->base_crl_number)
1551                         {
1552                         /* Check for cRLSign bit if keyUsage present */
1553                         if ((issuer->ex_flags & EXFLAG_KUSAGE) &&
1554                                 !(issuer->ex_kusage & KU_CRL_SIGN))
1555                                 {
1556                                 ctx->error = X509_V_ERR_KEYUSAGE_NO_CRL_SIGN;
1557                                 ok = ctx->verify_cb(0, ctx);
1558                                 if(!ok) goto err;
1559                                 }
1560
1561                         if (!(ctx->current_crl_score & CRL_SCORE_SCOPE))
1562                                 {
1563                                 ctx->error = X509_V_ERR_DIFFERENT_CRL_SCOPE;
1564                                 ok = ctx->verify_cb(0, ctx);
1565                                 if(!ok) goto err;
1566                                 }
1567
1568                         if (!(ctx->current_crl_score & CRL_SCORE_SAME_PATH))
1569                                 {
1570                                 if (check_crl_path(ctx, ctx->current_issuer) <= 0)
1571                                         {
1572                                         ctx->error = X509_V_ERR_CRL_PATH_VALIDATION_ERROR;
1573                                         ok = ctx->verify_cb(0, ctx);
1574                                         if(!ok) goto err;
1575                                         }
1576                                 }
1577
1578                         if (crl->idp_flags & IDP_INVALID)
1579                                 {
1580                                 ctx->error = X509_V_ERR_INVALID_EXTENSION;
1581                                 ok = ctx->verify_cb(0, ctx);
1582                                 if(!ok) goto err;
1583                                 }
1584
1585
1586                         }
1587
1588                 if (!(ctx->current_crl_score & CRL_SCORE_TIME))
1589                         {
1590                         ok = check_crl_time(ctx, crl, 1);
1591                         if (!ok)
1592                                 goto err;
1593                         }
1594
1595                 /* Attempt to get issuer certificate public key */
1596                 ikey = X509_get_pubkey(issuer);
1597
1598                 if(!ikey)
1599                         {
1600                         ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1601                         ok = ctx->verify_cb(0, ctx);
1602                         if (!ok) goto err;
1603                         }
1604                 else
1605                         {
1606                         int rv;
1607                         rv = X509_CRL_check_suiteb(crl, ikey, ctx->param->flags);
1608                         if (rv != X509_V_OK)
1609                                 {
1610                                 ctx->error=rv;
1611                                 ok = ctx->verify_cb(0, ctx);
1612                                 if (!ok)
1613                                         goto err;
1614                                 }
1615                         /* Verify CRL signature */
1616                         if(X509_CRL_verify(crl, ikey) <= 0)
1617                                 {
1618                                 ctx->error=X509_V_ERR_CRL_SIGNATURE_FAILURE;
1619                                 ok = ctx->verify_cb(0, ctx);
1620                                 if (!ok) goto err;
1621                                 }
1622                         }
1623                 }
1624
1625         ok = 1;
1626
1627         err:
1628         EVP_PKEY_free(ikey);
1629         return ok;
1630         }
1631
1632 /* Check certificate against CRL */
1633 static int cert_crl(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x)
1634         {
1635         int ok;
1636         X509_REVOKED *rev;
1637         /* The rules changed for this... previously if a CRL contained
1638          * unhandled critical extensions it could still be used to indicate
1639          * a certificate was revoked. This has since been changed since
1640          * critical extension can change the meaning of CRL entries.
1641          */
1642         if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
1643                 && (crl->flags & EXFLAG_CRITICAL))
1644                 {
1645                 ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION;
1646                 ok = ctx->verify_cb(0, ctx);
1647                 if(!ok)
1648                         return 0;
1649                 }
1650         /* Look for serial number of certificate in CRL
1651          * If found make sure reason is not removeFromCRL.
1652          */
1653         if (X509_CRL_get0_by_cert(crl, &rev, x))
1654                 {
1655                 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
1656                         return 2;
1657                 ctx->error = X509_V_ERR_CERT_REVOKED;
1658                 ok = ctx->verify_cb(0, ctx);
1659                 if (!ok)
1660                         return 0;
1661                 }
1662
1663         return 1;
1664         }
1665
1666 static int check_policy(X509_STORE_CTX *ctx)
1667         {
1668         int ret;
1669         if (ctx->parent)
1670                 return 1;
1671         ret = X509_policy_check(&ctx->tree, &ctx->explicit_policy, ctx->chain,
1672                                 ctx->param->policies, ctx->param->flags);
1673         if (ret == 0)
1674                 {
1675                 X509err(X509_F_CHECK_POLICY,ERR_R_MALLOC_FAILURE);
1676                 return 0;
1677                 }
1678         /* Invalid or inconsistent extensions */
1679         if (ret == -1)
1680                 {
1681                 /* Locate certificates with bad extensions and notify
1682                  * callback.
1683                  */
1684                 X509 *x;
1685                 int i;
1686                 for (i = 1; i < sk_X509_num(ctx->chain); i++)
1687                         {
1688                         x = sk_X509_value(ctx->chain, i);
1689                         if (!(x->ex_flags & EXFLAG_INVALID_POLICY))
1690                                 continue;
1691                         ctx->current_cert = x;
1692                         ctx->error = X509_V_ERR_INVALID_POLICY_EXTENSION;
1693                         if(!ctx->verify_cb(0, ctx))
1694                                 return 0;
1695                         }
1696                 return 1;
1697                 }
1698         if (ret == -2)
1699                 {
1700                 ctx->current_cert = NULL;
1701                 ctx->error = X509_V_ERR_NO_EXPLICIT_POLICY;
1702                 return ctx->verify_cb(0, ctx);
1703                 }
1704
1705         if (ctx->param->flags & X509_V_FLAG_NOTIFY_POLICY)
1706                 {
1707                 ctx->current_cert = NULL;
1708                 ctx->error = X509_V_OK;
1709                 if (!ctx->verify_cb(2, ctx))
1710                         return 0;
1711                 }
1712
1713         return 1;
1714         }
1715
1716 int x509_check_cert_time(X509_STORE_CTX *ctx, X509 *x, int quiet)
1717         {
1718         time_t *ptime;
1719         int i;
1720
1721         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
1722                 ptime = &ctx->param->check_time;
1723         else
1724                 ptime = NULL;
1725
1726         i=X509_cmp_time(X509_get_notBefore(x), ptime);
1727         if (i == 0)
1728                 {
1729                 if (quiet)
1730                         return 0;
1731                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
1732                 ctx->current_cert=x;
1733                 if (!ctx->verify_cb(0, ctx))
1734                         return 0;
1735                 }
1736
1737         if (i > 0)
1738                 {
1739                 if (quiet)
1740                         return 0;
1741                 ctx->error=X509_V_ERR_CERT_NOT_YET_VALID;
1742                 ctx->current_cert=x;
1743                 if (!ctx->verify_cb(0, ctx))
1744                         return 0;
1745                 }
1746
1747         i=X509_cmp_time(X509_get_notAfter(x), ptime);
1748         if (i == 0)
1749                 {
1750                 if (quiet)
1751                         return 0;
1752                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
1753                 ctx->current_cert=x;
1754                 if (!ctx->verify_cb(0, ctx))
1755                         return 0;
1756                 }
1757
1758         if (i < 0)
1759                 {
1760                 if (quiet)
1761                         return 0;
1762                 ctx->error=X509_V_ERR_CERT_HAS_EXPIRED;
1763                 ctx->current_cert=x;
1764                 if (!ctx->verify_cb(0, ctx))
1765                         return 0;
1766                 }
1767
1768         return 1;
1769         }
1770
1771 static int internal_verify(X509_STORE_CTX *ctx)
1772         {
1773         int ok=0,n;
1774         X509 *xs,*xi;
1775         EVP_PKEY *pkey=NULL;
1776         int (*cb)(int xok,X509_STORE_CTX *xctx);
1777
1778         cb=ctx->verify_cb;
1779
1780         n=sk_X509_num(ctx->chain);
1781         ctx->error_depth=n-1;
1782         n--;
1783         xi=sk_X509_value(ctx->chain,n);
1784
1785         if (ctx->check_issued(ctx, xi, xi))
1786                 xs=xi;
1787         else
1788                 {
1789                 if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN)
1790                         {
1791                         xs = xi;
1792                         goto check_cert;
1793                         }
1794                 if (n <= 0)
1795                         {
1796                         ctx->error=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
1797                         ctx->current_cert=xi;
1798                         ok=cb(0,ctx);
1799                         goto end;
1800                         }
1801                 else
1802                         {
1803                         n--;
1804                         ctx->error_depth=n;
1805                         xs=sk_X509_value(ctx->chain,n);
1806                         }
1807                 }
1808
1809 /*      ctx->error=0;  not needed */
1810         while (n >= 0)
1811                 {
1812                 ctx->error_depth=n;
1813
1814                 /* Skip signature check for self signed certificates unless
1815                  * explicitly asked for. It doesn't add any security and
1816                  * just wastes time.
1817                  */
1818                 if (!xs->valid && (xs != xi || (ctx->param->flags & X509_V_FLAG_CHECK_SS_SIGNATURE)))
1819                         {
1820                         if ((pkey=X509_get_pubkey(xi)) == NULL)
1821                                 {
1822                                 ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1823                                 ctx->current_cert=xi;
1824                                 ok=(*cb)(0,ctx);
1825                                 if (!ok) goto end;
1826                                 }
1827                         else if (X509_verify(xs,pkey) <= 0)
1828                                 {
1829                                 ctx->error=X509_V_ERR_CERT_SIGNATURE_FAILURE;
1830                                 ctx->current_cert=xs;
1831                                 ok=(*cb)(0,ctx);
1832                                 if (!ok)
1833                                         {
1834                                         EVP_PKEY_free(pkey);
1835                                         goto end;
1836                                         }
1837                                 }
1838                         EVP_PKEY_free(pkey);
1839                         pkey=NULL;
1840                         }
1841
1842                 xs->valid = 1;
1843
1844                 check_cert:
1845                 ok = x509_check_cert_time(ctx, xs, 0);
1846                 if (!ok)
1847                         goto end;
1848
1849                 /* The last error (if any) is still in the error value */
1850                 ctx->current_issuer=xi;
1851                 ctx->current_cert=xs;
1852                 ok=(*cb)(1,ctx);
1853                 if (!ok) goto end;
1854
1855                 n--;
1856                 if (n >= 0)
1857                         {
1858                         xi=xs;
1859                         xs=sk_X509_value(ctx->chain,n);
1860                         }
1861                 }
1862         ok=1;
1863 end:
1864         return ok;
1865         }
1866
1867 int X509_cmp_current_time(const ASN1_TIME *ctm)
1868 {
1869         return X509_cmp_time(ctm, NULL);
1870 }
1871
1872 int X509_cmp_time(const ASN1_TIME *ctm, time_t *cmp_time)
1873         {
1874         char *str;
1875         ASN1_TIME atm;
1876         long offset;
1877         char buff1[24],buff2[24],*p;
1878         int i,j;
1879
1880         p=buff1;
1881         i=ctm->length;
1882         str=(char *)ctm->data;
1883         if (ctm->type == V_ASN1_UTCTIME)
1884                 {
1885                 if ((i < 11) || (i > 17)) return 0;
1886                 memcpy(p,str,10);
1887                 p+=10;
1888                 str+=10;
1889                 }
1890         else
1891                 {
1892                 if (i < 13) return 0;
1893                 memcpy(p,str,12);
1894                 p+=12;
1895                 str+=12;
1896                 }
1897
1898         if ((*str == 'Z') || (*str == '-') || (*str == '+'))
1899                 { *(p++)='0'; *(p++)='0'; }
1900         else
1901                 {
1902                 *(p++)= *(str++);
1903                 *(p++)= *(str++);
1904                 /* Skip any fractional seconds... */
1905                 if (*str == '.')
1906                         {
1907                         str++;
1908                         while ((*str >= '0') && (*str <= '9')) str++;
1909                         }
1910
1911                 }
1912         *(p++)='Z';
1913         *(p++)='\0';
1914
1915         if (*str == 'Z')
1916                 offset=0;
1917         else
1918                 {
1919                 if ((*str != '+') && (*str != '-'))
1920                         return 0;
1921                 offset=((str[1]-'0')*10+(str[2]-'0'))*60;
1922                 offset+=(str[3]-'0')*10+(str[4]-'0');
1923                 if (*str == '-')
1924                         offset= -offset;
1925                 }
1926         atm.type=ctm->type;
1927         atm.flags = 0;
1928         atm.length=sizeof(buff2);
1929         atm.data=(unsigned char *)buff2;
1930
1931         if (X509_time_adj(&atm, offset*60, cmp_time) == NULL)
1932                 return 0;
1933
1934         if (ctm->type == V_ASN1_UTCTIME)
1935                 {
1936                 i=(buff1[0]-'0')*10+(buff1[1]-'0');
1937                 if (i < 50) i+=100; /* cf. RFC 2459 */
1938                 j=(buff2[0]-'0')*10+(buff2[1]-'0');
1939                 if (j < 50) j+=100;
1940
1941                 if (i < j) return -1;
1942                 if (i > j) return 1;
1943                 }
1944         i=strcmp(buff1,buff2);
1945         if (i == 0) /* wait a second then return younger :-) */
1946                 return -1;
1947         else
1948                 return i;
1949         }
1950
1951 ASN1_TIME *X509_gmtime_adj(ASN1_TIME *s, long adj)
1952 {
1953         return X509_time_adj(s, adj, NULL);
1954 }
1955
1956 ASN1_TIME *X509_time_adj(ASN1_TIME *s, long offset_sec, time_t *in_tm)
1957         {
1958         return X509_time_adj_ex(s, 0, offset_sec, in_tm);
1959         }
1960
1961 ASN1_TIME *X509_time_adj_ex(ASN1_TIME *s,
1962                                 int offset_day, long offset_sec, time_t *in_tm)
1963         {
1964         time_t t;
1965
1966         if (in_tm) t = *in_tm;
1967         else time(&t);
1968
1969         if (s && !(s->flags & ASN1_STRING_FLAG_MSTRING))
1970                 {
1971                 if (s->type == V_ASN1_UTCTIME)
1972                         return ASN1_UTCTIME_adj(s,t, offset_day, offset_sec);
1973                 if (s->type == V_ASN1_GENERALIZEDTIME)
1974                         return ASN1_GENERALIZEDTIME_adj(s, t, offset_day,
1975                                                                 offset_sec);
1976                 }
1977         return ASN1_TIME_adj(s, t, offset_day, offset_sec);
1978         }
1979
1980 int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain)
1981         {
1982         EVP_PKEY *ktmp=NULL,*ktmp2;
1983         int i,j;
1984
1985         if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) return 1;
1986
1987         for (i=0; i<sk_X509_num(chain); i++)
1988                 {
1989                 ktmp=X509_get_pubkey(sk_X509_value(chain,i));
1990                 if (ktmp == NULL)
1991                         {
1992                         X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
1993                         return 0;
1994                         }
1995                 if (!EVP_PKEY_missing_parameters(ktmp))
1996                         break;
1997                 else
1998                         {
1999                         EVP_PKEY_free(ktmp);
2000                         ktmp=NULL;
2001                         }
2002                 }
2003         if (ktmp == NULL)
2004                 {
2005                 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
2006                 return 0;
2007                 }
2008
2009         /* first, populate the other certs */
2010         for (j=i-1; j >= 0; j--)
2011                 {
2012                 ktmp2=X509_get_pubkey(sk_X509_value(chain,j));
2013                 EVP_PKEY_copy_parameters(ktmp2,ktmp);
2014                 EVP_PKEY_free(ktmp2);
2015                 }
2016
2017         if (pkey != NULL) EVP_PKEY_copy_parameters(pkey,ktmp);
2018         EVP_PKEY_free(ktmp);
2019         return 1;
2020         }
2021
2022 /* Make a delta CRL as the diff between two full CRLs */
2023
2024 X509_CRL *X509_CRL_diff(X509_CRL *base, X509_CRL *newer,
2025                         EVP_PKEY *skey, const EVP_MD *md, unsigned int flags)
2026         {
2027         X509_CRL *crl = NULL;
2028         int i;
2029         STACK_OF(X509_REVOKED) *revs = NULL;
2030         /* CRLs can't be delta already */
2031         if (base->base_crl_number || newer->base_crl_number)
2032                         {
2033                         X509err(X509_F_X509_CRL_DIFF, X509_R_CRL_ALREADY_DELTA);
2034                         return NULL;
2035                         }
2036         /* Base and new CRL must have a CRL number */
2037         if (!base->crl_number || !newer->crl_number)
2038                         {
2039                         X509err(X509_F_X509_CRL_DIFF, X509_R_NO_CRL_NUMBER);
2040                         return NULL;
2041                         }
2042         /* Issuer names must match */
2043         if (X509_NAME_cmp(X509_CRL_get_issuer(base),
2044                                 X509_CRL_get_issuer(newer)))
2045                         {
2046                         X509err(X509_F_X509_CRL_DIFF, X509_R_ISSUER_MISMATCH);
2047                         return NULL;
2048                         }
2049         /* AKID and IDP must match */
2050         if (!crl_extension_match(base, newer, NID_authority_key_identifier))
2051                         {
2052                         X509err(X509_F_X509_CRL_DIFF, X509_R_AKID_MISMATCH);
2053                         return NULL;
2054                         }
2055         if (!crl_extension_match(base, newer, NID_issuing_distribution_point))
2056                         {
2057                         X509err(X509_F_X509_CRL_DIFF, X509_R_IDP_MISMATCH);
2058                         return NULL;
2059                         }
2060         /* Newer CRL number must exceed full CRL number */
2061         if (ASN1_INTEGER_cmp(newer->crl_number, base->crl_number) <= 0)
2062                         {
2063                         X509err(X509_F_X509_CRL_DIFF, X509_R_NEWER_CRL_NOT_NEWER);
2064                         return NULL;
2065                         }
2066         /* CRLs must verify */
2067         if (skey && (X509_CRL_verify(base, skey) <= 0 ||
2068                         X509_CRL_verify(newer, skey) <= 0))
2069                 {
2070                 X509err(X509_F_X509_CRL_DIFF, X509_R_CRL_VERIFY_FAILURE);
2071                 return NULL;
2072                 }
2073         /* Create new CRL */
2074         crl = X509_CRL_new();
2075         if (!crl || !X509_CRL_set_version(crl, 1))
2076                 goto memerr;
2077         /* Set issuer name */
2078         if (!X509_CRL_set_issuer_name(crl, X509_CRL_get_issuer(newer)))
2079                 goto memerr;
2080
2081         if (!X509_CRL_set_lastUpdate(crl, X509_CRL_get_lastUpdate(newer)))
2082                 goto memerr;
2083         if (!X509_CRL_set_nextUpdate(crl, X509_CRL_get_nextUpdate(newer)))
2084                 goto memerr;
2085
2086         /* Set base CRL number: must be critical */
2087
2088         if (!X509_CRL_add1_ext_i2d(crl, NID_delta_crl, base->crl_number, 1, 0))
2089                 goto memerr;
2090
2091         /* Copy extensions across from newest CRL to delta: this will set
2092          * CRL number to correct value too.
2093          */
2094
2095         for (i = 0; i < X509_CRL_get_ext_count(newer); i++)
2096                 {
2097                 X509_EXTENSION *ext;
2098                 ext = X509_CRL_get_ext(newer, i);
2099                 if (!X509_CRL_add_ext(crl, ext, -1))
2100                         goto memerr;
2101                 }
2102
2103         /* Go through revoked entries, copying as needed */
2104
2105         revs = X509_CRL_get_REVOKED(newer);
2106
2107         for (i = 0; i < sk_X509_REVOKED_num(revs); i++)
2108                 {
2109                 X509_REVOKED *rvn, *rvtmp;
2110                 rvn = sk_X509_REVOKED_value(revs, i);
2111                 /* Add only if not also in base.
2112                  * TODO: need something cleverer here for some more complex
2113                  * CRLs covering multiple CAs.
2114                  */
2115                 if (!X509_CRL_get0_by_serial(base, &rvtmp, rvn->serialNumber))
2116                         {
2117                         rvtmp = X509_REVOKED_dup(rvn);
2118                         if (!rvtmp)
2119                                 goto memerr;
2120                         if (!X509_CRL_add0_revoked(crl, rvtmp))
2121                                 {
2122                                 X509_REVOKED_free(rvtmp);
2123                                 goto memerr;
2124                                 }
2125                         }
2126                 }
2127         /* TODO: optionally prune deleted entries */
2128
2129         if (skey && md && !X509_CRL_sign(crl, skey, md))
2130                 goto memerr;
2131
2132         return crl;
2133
2134         memerr:
2135         X509err(X509_F_X509_CRL_DIFF, ERR_R_MALLOC_FAILURE);
2136         if (crl)
2137                 X509_CRL_free(crl);
2138         return NULL;
2139         }
2140
2141 int X509_STORE_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
2142              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
2143         {
2144         /* This function is (usually) called only once, by
2145          * SSL_get_ex_data_X509_STORE_CTX_idx (ssl/ssl_cert.c). */
2146         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_X509_STORE_CTX, argl, argp,
2147                         new_func, dup_func, free_func);
2148         }
2149
2150 int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data)
2151         {
2152         return CRYPTO_set_ex_data(&ctx->ex_data,idx,data);
2153         }
2154
2155 void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx)
2156         {
2157         return CRYPTO_get_ex_data(&ctx->ex_data,idx);
2158         }
2159
2160 int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx)
2161         {
2162         return ctx->error;
2163         }
2164
2165 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err)
2166         {
2167         ctx->error=err;
2168         }
2169
2170 int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx)
2171         {
2172         return ctx->error_depth;
2173         }
2174
2175 X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx)
2176         {
2177         return ctx->current_cert;
2178         }
2179
2180 STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx)
2181         {
2182         return ctx->chain;
2183         }
2184
2185 STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx)
2186         {
2187         if (!ctx->chain)
2188                 return NULL;
2189         return X509_chain_up_ref(ctx->chain);
2190         }
2191
2192 X509 *X509_STORE_CTX_get0_current_issuer(X509_STORE_CTX *ctx)
2193         {
2194         return ctx->current_issuer;
2195         }
2196
2197 X509_CRL *X509_STORE_CTX_get0_current_crl(X509_STORE_CTX *ctx)
2198         {
2199         return ctx->current_crl;
2200         }
2201
2202 X509_STORE_CTX *X509_STORE_CTX_get0_parent_ctx(X509_STORE_CTX *ctx)
2203         {
2204         return ctx->parent;
2205         }
2206
2207 void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x)
2208         {
2209         ctx->cert=x;
2210         }
2211
2212 void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2213         {
2214         ctx->untrusted=sk;
2215         }
2216
2217 void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk)
2218         {
2219         ctx->crls=sk;
2220         }
2221
2222 int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose)
2223         {
2224         return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0);
2225         }
2226
2227 int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust)
2228         {
2229         return X509_STORE_CTX_purpose_inherit(ctx, 0, 0, trust);
2230         }
2231
2232 /* This function is used to set the X509_STORE_CTX purpose and trust
2233  * values. This is intended to be used when another structure has its
2234  * own trust and purpose values which (if set) will be inherited by
2235  * the ctx. If they aren't set then we will usually have a default
2236  * purpose in mind which should then be used to set the trust value.
2237  * An example of this is SSL use: an SSL structure will have its own
2238  * purpose and trust settings which the application can set: if they
2239  * aren't set then we use the default of SSL client/server.
2240  */
2241
2242 int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
2243                                 int purpose, int trust)
2244 {
2245         int idx;
2246         /* If purpose not set use default */
2247         if (!purpose) purpose = def_purpose;
2248         /* If we have a purpose then check it is valid */
2249         if (purpose)
2250                 {
2251                 X509_PURPOSE *ptmp;
2252                 idx = X509_PURPOSE_get_by_id(purpose);
2253                 if (idx == -1)
2254                         {
2255                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2256                                                 X509_R_UNKNOWN_PURPOSE_ID);
2257                         return 0;
2258                         }
2259                 ptmp = X509_PURPOSE_get0(idx);
2260                 if (ptmp->trust == X509_TRUST_DEFAULT)
2261                         {
2262                         idx = X509_PURPOSE_get_by_id(def_purpose);
2263                         if (idx == -1)
2264                                 {
2265                                 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2266                                                 X509_R_UNKNOWN_PURPOSE_ID);
2267                                 return 0;
2268                                 }
2269                         ptmp = X509_PURPOSE_get0(idx);
2270                         }
2271                 /* If trust not set then get from purpose default */
2272                 if (!trust) trust = ptmp->trust;
2273                 }
2274         if (trust)
2275                 {
2276                 idx = X509_TRUST_get_by_id(trust);
2277                 if (idx == -1)
2278                         {
2279                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2280                                                 X509_R_UNKNOWN_TRUST_ID);
2281                         return 0;
2282                         }
2283                 }
2284
2285         if (purpose && !ctx->param->purpose) ctx->param->purpose = purpose;
2286         if (trust && !ctx->param->trust) ctx->param->trust = trust;
2287         return 1;
2288 }
2289
2290 X509_STORE_CTX *X509_STORE_CTX_new(void)
2291 {
2292         X509_STORE_CTX *ctx;
2293         ctx = (X509_STORE_CTX *)OPENSSL_malloc(sizeof(X509_STORE_CTX));
2294         if (!ctx)
2295                 {
2296                 X509err(X509_F_X509_STORE_CTX_NEW,ERR_R_MALLOC_FAILURE);
2297                 return NULL;
2298                 }
2299         memset(ctx, 0, sizeof(X509_STORE_CTX));
2300         return ctx;
2301 }
2302
2303 void X509_STORE_CTX_free(X509_STORE_CTX *ctx)
2304 {
2305         X509_STORE_CTX_cleanup(ctx);
2306         OPENSSL_free(ctx);
2307 }
2308
2309 int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store, X509 *x509,
2310              STACK_OF(X509) *chain)
2311         {
2312         int ret = 1;
2313         ctx->ctx=store;
2314         ctx->current_method=0;
2315         ctx->cert=x509;
2316         ctx->untrusted=chain;
2317         ctx->crls = NULL;
2318         ctx->last_untrusted=0;
2319         ctx->other_ctx=NULL;
2320         ctx->valid=0;
2321         ctx->chain=NULL;
2322         ctx->error=0;
2323         ctx->explicit_policy=0;
2324         ctx->error_depth=0;
2325         ctx->current_cert=NULL;
2326         ctx->current_issuer=NULL;
2327         ctx->current_crl=NULL;
2328         ctx->current_crl_score=0;
2329         ctx->current_reasons=0;
2330         ctx->tree = NULL;
2331         ctx->parent = NULL;
2332
2333         ctx->param = X509_VERIFY_PARAM_new();
2334
2335         if (!ctx->param)
2336                 {
2337                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2338                 return 0;
2339                 }
2340
2341         /* Inherit callbacks and flags from X509_STORE if not set
2342          * use defaults.
2343          */
2344
2345
2346         if (store)
2347                 ret = X509_VERIFY_PARAM_inherit(ctx->param, store->param);
2348         else
2349                 ctx->param->inh_flags |= X509_VP_FLAG_DEFAULT|X509_VP_FLAG_ONCE;
2350
2351         if (store)
2352                 {
2353                 ctx->verify_cb = store->verify_cb;
2354                 ctx->cleanup = store->cleanup;
2355                 }
2356         else
2357                 ctx->cleanup = 0;
2358
2359         if (ret)
2360                 ret = X509_VERIFY_PARAM_inherit(ctx->param,
2361                                         X509_VERIFY_PARAM_lookup("default"));
2362
2363         if (ret == 0)
2364                 {
2365                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2366                 return 0;
2367                 }
2368
2369         if (store && store->check_issued)
2370                 ctx->check_issued = store->check_issued;
2371         else
2372                 ctx->check_issued = check_issued;
2373
2374         if (store && store->get_issuer)
2375                 ctx->get_issuer = store->get_issuer;
2376         else
2377                 ctx->get_issuer = X509_STORE_CTX_get1_issuer;
2378
2379         if (store && store->verify_cb)
2380                 ctx->verify_cb = store->verify_cb;
2381         else
2382                 ctx->verify_cb = null_callback;
2383
2384         if (store && store->verify)
2385                 ctx->verify = store->verify;
2386         else
2387                 ctx->verify = internal_verify;
2388
2389         if (store && store->check_revocation)
2390                 ctx->check_revocation = store->check_revocation;
2391         else
2392                 ctx->check_revocation = check_revocation;
2393
2394         if (store && store->get_crl)
2395                 ctx->get_crl = store->get_crl;
2396         else
2397                 ctx->get_crl = NULL;
2398
2399         if (store && store->check_crl)
2400                 ctx->check_crl = store->check_crl;
2401         else
2402                 ctx->check_crl = check_crl;
2403
2404         if (store && store->cert_crl)
2405                 ctx->cert_crl = store->cert_crl;
2406         else
2407                 ctx->cert_crl = cert_crl;
2408
2409         if (store && store->lookup_certs)
2410                 ctx->lookup_certs = store->lookup_certs;
2411         else
2412                 ctx->lookup_certs = X509_STORE_get1_certs;
2413
2414         if (store && store->lookup_crls)
2415                 ctx->lookup_crls = store->lookup_crls;
2416         else
2417                 ctx->lookup_crls = X509_STORE_get1_crls;
2418
2419         ctx->check_policy = check_policy;
2420
2421
2422         /* This memset() can't make any sense anyway, so it's removed. As
2423          * X509_STORE_CTX_cleanup does a proper "free" on the ex_data, we put a
2424          * corresponding "new" here and remove this bogus initialisation. */
2425         /* memset(&(ctx->ex_data),0,sizeof(CRYPTO_EX_DATA)); */
2426         if(!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx,
2427                                 &(ctx->ex_data)))
2428                 {
2429                 OPENSSL_free(ctx);
2430                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2431                 return 0;
2432                 }
2433         return 1;
2434         }
2435
2436 /* Set alternative lookup method: just a STACK of trusted certificates.
2437  * This avoids X509_STORE nastiness where it isn't needed.
2438  */
2439
2440 void X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2441 {
2442         ctx->other_ctx = sk;
2443         ctx->get_issuer = get_issuer_sk;
2444 }
2445
2446 void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx)
2447         {
2448         if (ctx->cleanup) ctx->cleanup(ctx);
2449         if (ctx->param != NULL)
2450                 {
2451                 if (ctx->parent == NULL)
2452                         X509_VERIFY_PARAM_free(ctx->param);
2453                 ctx->param=NULL;
2454                 }
2455         if (ctx->tree != NULL)
2456                 {
2457                 X509_policy_tree_free(ctx->tree);
2458                 ctx->tree=NULL;
2459                 }
2460         if (ctx->chain != NULL)
2461                 {
2462                 sk_X509_pop_free(ctx->chain,X509_free);
2463                 ctx->chain=NULL;
2464                 }
2465         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, &(ctx->ex_data));
2466         memset(&ctx->ex_data,0,sizeof(CRYPTO_EX_DATA));
2467         }
2468
2469 void X509_STORE_CTX_set_depth(X509_STORE_CTX *ctx, int depth)
2470         {
2471         X509_VERIFY_PARAM_set_depth(ctx->param, depth);
2472         }
2473
2474 void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, unsigned long flags)
2475         {
2476         X509_VERIFY_PARAM_set_flags(ctx->param, flags);
2477         }
2478
2479 void X509_STORE_CTX_set_time(X509_STORE_CTX *ctx, unsigned long flags, time_t t)
2480         {
2481         X509_VERIFY_PARAM_set_time(ctx->param, t);
2482         }
2483
2484 void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx,
2485                                   int (*verify_cb)(int, X509_STORE_CTX *))
2486         {
2487         ctx->verify_cb=verify_cb;
2488         }
2489
2490 X509_POLICY_TREE *X509_STORE_CTX_get0_policy_tree(X509_STORE_CTX *ctx)
2491         {
2492         return ctx->tree;
2493         }
2494
2495 int X509_STORE_CTX_get_explicit_policy(X509_STORE_CTX *ctx)
2496         {
2497         return ctx->explicit_policy;
2498         }
2499
2500 int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name)
2501         {
2502         const X509_VERIFY_PARAM *param;
2503         param = X509_VERIFY_PARAM_lookup(name);
2504         if (!param)
2505                 return 0;
2506         return X509_VERIFY_PARAM_inherit(ctx->param, param);
2507         }
2508
2509 X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx)
2510         {
2511         return ctx->param;
2512         }
2513
2514 void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param)
2515         {
2516         if (ctx->param)
2517                 X509_VERIFY_PARAM_free(ctx->param);
2518         ctx->param = param;
2519         }
2520
2521 IMPLEMENT_STACK_OF(X509)
2522 IMPLEMENT_ASN1_SET_OF(X509)
2523
2524 IMPLEMENT_STACK_OF(X509_NAME)
2525
2526 IMPLEMENT_STACK_OF(X509_ATTRIBUTE)
2527 IMPLEMENT_ASN1_SET_OF(X509_ATTRIBUTE)