crypto/libressl/crypto/x509v3/v3_ncons.c

   1 /* $OpenBSD: v3_ncons.c,v 1.8 2015/07/25 16:14:29 jsing Exp $ */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2003 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include <string.h>
  61
  62 #include <openssl/asn1t.h>
  63 #include <openssl/conf.h>
  64 #include <openssl/err.h>
  65 #include <openssl/x509v3.h>
  66
  67 static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
  68     X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval);
  69 static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
  70     void *a, BIO *bp, int ind);
  71 static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
  72     STACK_OF(GENERAL_SUBTREE) *trees, BIO *bp, int ind, char *name);
  73 static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip);
  74
  75 static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc);
  76 static int nc_match_single(GENERAL_NAME *sub, GENERAL_NAME *gen);
  77 static int nc_dn(X509_NAME *sub, X509_NAME *nm);
  78 static int nc_dns(ASN1_IA5STRING *sub, ASN1_IA5STRING *dns);
  79 static int nc_email(ASN1_IA5STRING *sub, ASN1_IA5STRING *eml);
  80 static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base);
  81
  82 const X509V3_EXT_METHOD v3_name_constraints = {
  83         .ext_nid = NID_name_constraints,
  84         .ext_flags = 0,
  85         .it = ASN1_ITEM_ref(NAME_CONSTRAINTS),
  86         .ext_new = NULL,
  87         .ext_free = NULL,
  88         .d2i = NULL,
  89         .i2d = NULL,
  90         .i2s = NULL,
  91         .s2i = NULL,
  92         .i2v = NULL,
  93         .v2i = v2i_NAME_CONSTRAINTS,
  94         .i2r = i2r_NAME_CONSTRAINTS,
  95         .r2i = NULL,
  96         .usr_data = NULL,
  97 };
  98
  99 static const ASN1_TEMPLATE GENERAL_SUBTREE_seq_tt[] = {
 100         {
 101                 .flags = 0,
 102                 .tag = 0,
 103                 .offset = offsetof(GENERAL_SUBTREE, base),
 104                 .field_name = "base",
 105                 .item = &GENERAL_NAME_it,
 106         },
 107         {
 108                 .flags = ASN1_TFLG_IMPLICIT | ASN1_TFLG_OPTIONAL,
 109                 .tag = 0,
 110                 .offset = offsetof(GENERAL_SUBTREE, minimum),
 111                 .field_name = "minimum",
 112                 .item = &ASN1_INTEGER_it,
 113         },
 114         {
 115                 .flags = ASN1_TFLG_IMPLICIT | ASN1_TFLG_OPTIONAL,
 116                 .tag = 1,
 117                 .offset = offsetof(GENERAL_SUBTREE, maximum),
 118                 .field_name = "maximum",
 119                 .item = &ASN1_INTEGER_it,
 120         },
 121 };
 122
 123 const ASN1_ITEM GENERAL_SUBTREE_it = {
 124         .itype = ASN1_ITYPE_SEQUENCE,
 125         .utype = V_ASN1_SEQUENCE,
 126         .templates = GENERAL_SUBTREE_seq_tt,
 127         .tcount = sizeof(GENERAL_SUBTREE_seq_tt) / sizeof(ASN1_TEMPLATE),
 128         .funcs = NULL,
 129         .size = sizeof(GENERAL_SUBTREE),
 130         .sname = "GENERAL_SUBTREE",
 131 };
 132
 133 static const ASN1_TEMPLATE NAME_CONSTRAINTS_seq_tt[] = {
 134         {
 135                 .flags = ASN1_TFLG_IMPLICIT | ASN1_TFLG_SEQUENCE_OF | ASN1_TFLG_OPTIONAL,
 136                 .tag = 0,
 137                 .offset = offsetof(NAME_CONSTRAINTS, permittedSubtrees),
 138                 .field_name = "permittedSubtrees",
 139                 .item = &GENERAL_SUBTREE_it,
 140         },
 141         {
 142                 .flags = ASN1_TFLG_IMPLICIT | ASN1_TFLG_SEQUENCE_OF | ASN1_TFLG_OPTIONAL,
 143                 .tag = 1,
 144                 .offset = offsetof(NAME_CONSTRAINTS, excludedSubtrees),
 145                 .field_name = "excludedSubtrees",
 146                 .item = &GENERAL_SUBTREE_it,
 147         },
 148 };
 149
 150 const ASN1_ITEM NAME_CONSTRAINTS_it = {
 151         .itype = ASN1_ITYPE_SEQUENCE,
 152         .utype = V_ASN1_SEQUENCE,
 153         .templates = NAME_CONSTRAINTS_seq_tt,
 154         .tcount = sizeof(NAME_CONSTRAINTS_seq_tt) / sizeof(ASN1_TEMPLATE),
 155         .funcs = NULL,
 156         .size = sizeof(NAME_CONSTRAINTS),
 157         .sname = "NAME_CONSTRAINTS",
 158 };
 159
 160
 161 GENERAL_SUBTREE *
 162 GENERAL_SUBTREE_new(void)
 163 {
 164         return (GENERAL_SUBTREE*)ASN1_item_new(&GENERAL_SUBTREE_it);
 165 }
 166
 167 void
 168 GENERAL_SUBTREE_free(GENERAL_SUBTREE *a)
 169 {
 170         ASN1_item_free((ASN1_VALUE *)a, &GENERAL_SUBTREE_it);
 171 }
 172
 173 NAME_CONSTRAINTS *
 174 NAME_CONSTRAINTS_new(void)
 175 {
 176         return (NAME_CONSTRAINTS*)ASN1_item_new(&NAME_CONSTRAINTS_it);
 177 }
 178
 179 void
 180 NAME_CONSTRAINTS_free(NAME_CONSTRAINTS *a)
 181 {
 182         ASN1_item_free((ASN1_VALUE *)a, &NAME_CONSTRAINTS_it);
 183 }
 184
 185 static void *
 186 v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, X509V3_CTX *ctx,
 187     STACK_OF(CONF_VALUE) *nval)
 188 {
 189         int i;
 190         CONF_VALUE tval, *val;
 191         STACK_OF(GENERAL_SUBTREE) **ptree = NULL;
 192         NAME_CONSTRAINTS *ncons = NULL;
 193         GENERAL_SUBTREE *sub = NULL;
 194
 195         ncons = NAME_CONSTRAINTS_new();
 196         if (!ncons)
 197                 goto memerr;
 198         for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
 199                 val = sk_CONF_VALUE_value(nval, i);
 200                 if (!strncmp(val->name, "permitted", 9) && val->name[9]) {
 201                         ptree = &ncons->permittedSubtrees;
 202                         tval.name = val->name + 10;
 203                 } else if (!strncmp(val->name, "excluded", 8) && val->name[8]) {
 204                         ptree = &ncons->excludedSubtrees;
 205                         tval.name = val->name + 9;
 206                 } else {
 207                         X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS,
 208                             X509V3_R_INVALID_SYNTAX);
 209                         goto err;
 210                 }
 211                 tval.value = val->value;
 212                 sub = GENERAL_SUBTREE_new();
 213                 if (!v2i_GENERAL_NAME_ex(sub->base, method, ctx, &tval, 1))
 214                         goto err;
 215                 if (!*ptree)
 216                         *ptree = sk_GENERAL_SUBTREE_new_null();
 217                 if (!*ptree || !sk_GENERAL_SUBTREE_push(*ptree, sub))
 218                         goto memerr;
 219                 sub = NULL;
 220         }
 221
 222         return ncons;
 223
 224 memerr:
 225         X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, ERR_R_MALLOC_FAILURE);
 226 err:
 227         if (ncons)
 228                 NAME_CONSTRAINTS_free(ncons);
 229         if (sub)
 230                 GENERAL_SUBTREE_free(sub);
 231
 232         return NULL;
 233 }
 234
 235 static int
 236 i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a, BIO *bp, int ind)
 237 {
 238         NAME_CONSTRAINTS *ncons = a;
 239
 240         do_i2r_name_constraints(method, ncons->permittedSubtrees,
 241             bp, ind, "Permitted");
 242         do_i2r_name_constraints(method, ncons->excludedSubtrees,
 243             bp, ind, "Excluded");
 244         return 1;
 245 }
 246
 247 static int
 248 do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
 249     STACK_OF(GENERAL_SUBTREE) *trees, BIO *bp, int ind, char *name)
 250 {
 251         GENERAL_SUBTREE *tree;
 252         int i;
 253
 254         if (sk_GENERAL_SUBTREE_num(trees) > 0)
 255                 BIO_printf(bp, "%*s%s:\n", ind, "", name);
 256         for (i = 0; i < sk_GENERAL_SUBTREE_num(trees); i++) {
 257                 tree = sk_GENERAL_SUBTREE_value(trees, i);
 258                 BIO_printf(bp, "%*s", ind + 2, "");
 259                 if (tree->base->type == GEN_IPADD)
 260                         print_nc_ipadd(bp, tree->base->d.ip);
 261                 else
 262                         GENERAL_NAME_print(bp, tree->base);
 263                 BIO_puts(bp, "\n");
 264         }
 265         return 1;
 266 }
 267
 268 static int
 269 print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip)
 270 {
 271         int i, len;
 272         unsigned char *p;
 273
 274         p = ip->data;
 275         len = ip->length;
 276         BIO_puts(bp, "IP:");
 277         if (len == 8) {
 278                 BIO_printf(bp, "%d.%d.%d.%d/%d.%d.%d.%d",
 279                     p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
 280         } else if (len == 32) {
 281                 for (i = 0; i < 16; i++) {
 282                         BIO_printf(bp, "%X", p[0] << 8 | p[1]);
 283                         p += 2;
 284                         if (i == 7)
 285                                 BIO_puts(bp, "/");
 286                         else if (i != 15)
 287                                 BIO_puts(bp, ":");
 288                 }
 289         } else
 290                 BIO_printf(bp, "IP Address:<invalid>");
 291         return 1;
 292 }
 293
 294 /* Check a certificate conforms to a specified set of constraints.
 295  * Return values:
 296  *  X509_V_OK: All constraints obeyed.
 297  *  X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation.
 298  *  X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation.
 299  *  X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
 300  *  X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE:  Unsupported constraint type.
 301  *  X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad unsupported constraint syntax.
 302  *  X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: bad or unsupported syntax of name
 303  */
 304
 305 int
 306 NAME_CONSTRAINTS_check(X509 *x, NAME_CONSTRAINTS *nc)
 307 {
 308         int r, i;
 309         X509_NAME *nm;
 310
 311         nm = X509_get_subject_name(x);
 312
 313         if (X509_NAME_entry_count(nm) > 0) {
 314                 GENERAL_NAME gntmp;
 315                 gntmp.type = GEN_DIRNAME;
 316                 gntmp.d.directoryName = nm;
 317
 318                 r = nc_match(&gntmp, nc);
 319
 320                 if (r != X509_V_OK)
 321                         return r;
 322
 323                 gntmp.type = GEN_EMAIL;
 324
 325                 /* Process any email address attributes in subject name */
 326
 327                 for (i = -1;;) {
 328                         X509_NAME_ENTRY *ne;
 329                         i = X509_NAME_get_index_by_NID(nm,
 330                             NID_pkcs9_emailAddress, i);
 331                         if (i == -1)
 332                                 break;
 333                         ne = X509_NAME_get_entry(nm, i);
 334                         gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne);
 335                         if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING)
 336                                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
 337
 338                         r = nc_match(&gntmp, nc);
 339
 340                         if (r != X509_V_OK)
 341                                 return r;
 342                 }
 343
 344         }
 345
 346         for (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++) {
 347                 GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i);
 348                 r = nc_match(gen, nc);
 349                 if (r != X509_V_OK)
 350                         return r;
 351         }
 352
 353         return X509_V_OK;
 354 }
 355
 356 static int
 357 nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc)
 358 {
 359         GENERAL_SUBTREE *sub;
 360         int i, r, match = 0;
 361
 362         /* Permitted subtrees: if any subtrees exist of matching the type
 363          * at least one subtree must match.
 364          */
 365
 366         for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++) {
 367                 sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i);
 368                 if (gen->type != sub->base->type)
 369                         continue;
 370                 if (sub->minimum || sub->maximum)
 371                         return X509_V_ERR_SUBTREE_MINMAX;
 372                 /* If we already have a match don't bother trying any more */
 373                 if (match == 2)
 374                         continue;
 375                 if (match == 0)
 376                         match = 1;
 377                 r = nc_match_single(gen, sub->base);
 378                 if (r == X509_V_OK)
 379                         match = 2;
 380                 else if (r != X509_V_ERR_PERMITTED_VIOLATION)
 381                         return r;
 382         }
 383
 384         if (match == 1)
 385                 return X509_V_ERR_PERMITTED_VIOLATION;
 386
 387         /* Excluded subtrees: must not match any of these */
 388
 389         for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++) {
 390                 sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i);
 391                 if (gen->type != sub->base->type)
 392                         continue;
 393                 if (sub->minimum || sub->maximum)
 394                         return X509_V_ERR_SUBTREE_MINMAX;
 395
 396                 r = nc_match_single(gen, sub->base);
 397                 if (r == X509_V_OK)
 398                         return X509_V_ERR_EXCLUDED_VIOLATION;
 399                 else if (r != X509_V_ERR_PERMITTED_VIOLATION)
 400                         return r;
 401
 402         }
 403
 404         return X509_V_OK;
 405 }
 406
 407 static int
 408 nc_match_single(GENERAL_NAME *gen, GENERAL_NAME *base)
 409 {
 410         switch (base->type) {
 411         case GEN_DIRNAME:
 412                 return nc_dn(gen->d.directoryName, base->d.directoryName);
 413
 414         case GEN_DNS:
 415                 return nc_dns(gen->d.dNSName, base->d.dNSName);
 416
 417         case GEN_EMAIL:
 418                 return nc_email(gen->d.rfc822Name, base->d.rfc822Name);
 419
 420         case GEN_URI:
 421                 return nc_uri(gen->d.uniformResourceIdentifier,
 422                     base->d.uniformResourceIdentifier);
 423
 424         default:
 425                 return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
 426         }
 427 }
 428
 429 /* directoryName name constraint matching.
 430  * The canonical encoding of X509_NAME makes this comparison easy. It is
 431  * matched if the subtree is a subset of the name.
 432  */
 433
 434 static int
 435 nc_dn(X509_NAME *nm, X509_NAME *base)
 436 {
 437         /* Ensure canonical encodings are up to date.  */
 438         if (nm->modified && i2d_X509_NAME(nm, NULL) < 0)
 439                 return X509_V_ERR_OUT_OF_MEM;
 440         if (base->modified && i2d_X509_NAME(base, NULL) < 0)
 441                 return X509_V_ERR_OUT_OF_MEM;
 442         if (base->canon_enclen > nm->canon_enclen)
 443                 return X509_V_ERR_PERMITTED_VIOLATION;
 444         if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
 445                 return X509_V_ERR_PERMITTED_VIOLATION;
 446         return X509_V_OK;
 447 }
 448
 449 static int
 450 nc_dns(ASN1_IA5STRING *dns, ASN1_IA5STRING *base)
 451 {
 452         char *baseptr = (char *)base->data;
 453         char *dnsptr = (char *)dns->data;
 454
 455         /* Empty matches everything */
 456         if (!*baseptr)
 457                 return X509_V_OK;
 458         /* Otherwise can add zero or more components on the left so
 459          * compare RHS and if dns is longer and expect '.' as preceding
 460          * character.
 461          */
 462         if (dns->length > base->length) {
 463                 dnsptr += dns->length - base->length;
 464                 if (dnsptr[-1] != '.')
 465                         return X509_V_ERR_PERMITTED_VIOLATION;
 466         }
 467
 468         if (strcasecmp(baseptr, dnsptr))
 469                 return X509_V_ERR_PERMITTED_VIOLATION;
 470
 471         return X509_V_OK;
 472 }
 473
 474 static int
 475 nc_email(ASN1_IA5STRING *eml, ASN1_IA5STRING *base)
 476 {
 477         const char *baseptr = (char *)base->data;
 478         const char *emlptr = (char *)eml->data;
 479         const char *baseat = strchr(baseptr, '@');
 480         const char *emlat = strchr(emlptr, '@');
 481
 482         if (!emlat)
 483                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
 484         /* Special case: inital '.' is RHS match */
 485         if (!baseat && (*baseptr == '.')) {
 486                 if (eml->length > base->length) {
 487                         emlptr += eml->length - base->length;
 488                         if (!strcasecmp(baseptr, emlptr))
 489                                 return X509_V_OK;
 490                 }
 491                 return X509_V_ERR_PERMITTED_VIOLATION;
 492         }
 493
 494         /* If we have anything before '@' match local part */
 495
 496         if (baseat) {
 497                 if (baseat != baseptr) {
 498                         if ((baseat - baseptr) != (emlat - emlptr))
 499                                 return X509_V_ERR_PERMITTED_VIOLATION;
 500                         /* Case sensitive match of local part */
 501                         if (strncmp(baseptr, emlptr, emlat - emlptr))
 502                                 return X509_V_ERR_PERMITTED_VIOLATION;
 503                 }
 504                 /* Position base after '@' */
 505                 baseptr = baseat + 1;
 506         }
 507         emlptr = emlat + 1;
 508         /* Just have hostname left to match: case insensitive */
 509         if (strcasecmp(baseptr, emlptr))
 510                 return X509_V_ERR_PERMITTED_VIOLATION;
 511
 512         return X509_V_OK;
 513 }
 514
 515 static int
 516 nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base)
 517 {
 518         const char *baseptr = (char *)base->data;
 519         const char *hostptr = (char *)uri->data;
 520         const char *p = strchr(hostptr, ':');
 521         int hostlen;
 522
 523         /* Check for foo:// and skip past it */
 524         if (!p || (p[1] != '/') || (p[2] != '/'))
 525                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
 526         hostptr = p + 3;
 527
 528         /* Determine length of hostname part of URI */
 529
 530         /* Look for a port indicator as end of hostname first */
 531
 532         p = strchr(hostptr, ':');
 533         /* Otherwise look for trailing slash */
 534         if (!p)
 535                 p = strchr(hostptr, '/');
 536
 537         if (!p)
 538                 hostlen = strlen(hostptr);
 539         else
 540                 hostlen = p - hostptr;
 541
 542         if (hostlen == 0)
 543                 return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
 544
 545         /* Special case: inital '.' is RHS match */
 546         if (*baseptr == '.') {
 547                 if (hostlen > base->length) {
 548                         p = hostptr + hostlen - base->length;
 549                         if (!strncasecmp(p, baseptr, base->length))
 550                                 return X509_V_OK;
 551                 }
 552                 return X509_V_ERR_PERMITTED_VIOLATION;
 553         }
 554
 555         if ((base->length != (int)hostlen) ||
 556             strncasecmp(hostptr, baseptr, hostlen))
 557                 return X509_V_ERR_PERMITTED_VIOLATION;
 558
 559         return X509_V_OK;
 560 }