crypto/openssl/crypto/x509v3/v3_asid.c

   1 /*
   2  * Contributed to the OpenSSL Project by the American Registry for
   3  * Internet Numbers ("ARIN").
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2006 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  * Implementation of RFC 3779 section 3.2.
  60  */
  61
  62 #include <stdio.h>
  63 #include <string.h>
  64 #include "cryptlib.h"
  65 #include <openssl/conf.h>
  66 #include <openssl/asn1.h>
  67 #include <openssl/asn1t.h>
  68 #include <openssl/x509v3.h>
  69 #include <openssl/x509.h>
  70 #include <openssl/bn.h>
  71
  72 #ifndef OPENSSL_NO_RFC3779
  73
  74 /*
  75  * OpenSSL ASN.1 template translation of RFC 3779 3.2.3.
  76  */
  77
  78 ASN1_SEQUENCE(ASRange) = {
  79   ASN1_SIMPLE(ASRange, min, ASN1_INTEGER),
  80   ASN1_SIMPLE(ASRange, max, ASN1_INTEGER)
  81 } ASN1_SEQUENCE_END(ASRange)
  82
  83 ASN1_CHOICE(ASIdOrRange) = {
  84   ASN1_SIMPLE(ASIdOrRange, u.id,    ASN1_INTEGER),
  85   ASN1_SIMPLE(ASIdOrRange, u.range, ASRange)
  86 } ASN1_CHOICE_END(ASIdOrRange)
  87
  88 ASN1_CHOICE(ASIdentifierChoice) = {
  89   ASN1_SIMPLE(ASIdentifierChoice,      u.inherit,       ASN1_NULL),
  90   ASN1_SEQUENCE_OF(ASIdentifierChoice, u.asIdsOrRanges, ASIdOrRange)
  91 } ASN1_CHOICE_END(ASIdentifierChoice)
  92
  93 ASN1_SEQUENCE(ASIdentifiers) = {
  94   ASN1_EXP_OPT(ASIdentifiers, asnum, ASIdentifierChoice, 0),
  95   ASN1_EXP_OPT(ASIdentifiers, rdi,   ASIdentifierChoice, 1)
  96 } ASN1_SEQUENCE_END(ASIdentifiers)
  97
  98 IMPLEMENT_ASN1_FUNCTIONS(ASRange)
  99 IMPLEMENT_ASN1_FUNCTIONS(ASIdOrRange)
 100 IMPLEMENT_ASN1_FUNCTIONS(ASIdentifierChoice)
 101 IMPLEMENT_ASN1_FUNCTIONS(ASIdentifiers)
 102
 103 /*
 104  * i2r method for an ASIdentifierChoice.
 105  */
 106 static int i2r_ASIdentifierChoice(BIO *out,
 107                                   ASIdentifierChoice *choice,
 108                                   int indent, const char *msg)
 109 {
 110     int i;
 111     char *s;
 112     if (choice == NULL)
 113         return 1;
 114     BIO_printf(out, "%*s%s:\n", indent, "", msg);
 115     switch (choice->type) {
 116     case ASIdentifierChoice_inherit:
 117         BIO_printf(out, "%*sinherit\n", indent + 2, "");
 118         break;
 119     case ASIdentifierChoice_asIdsOrRanges:
 120         for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges); i++) {
 121             ASIdOrRange *aor =
 122                 sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
 123             switch (aor->type) {
 124             case ASIdOrRange_id:
 125                 if ((s = i2s_ASN1_INTEGER(NULL, aor->u.id)) == NULL)
 126                     return 0;
 127                 BIO_printf(out, "%*s%s\n", indent + 2, "", s);
 128                 OPENSSL_free(s);
 129                 break;
 130             case ASIdOrRange_range:
 131                 if ((s = i2s_ASN1_INTEGER(NULL, aor->u.range->min)) == NULL)
 132                     return 0;
 133                 BIO_printf(out, "%*s%s-", indent + 2, "", s);
 134                 OPENSSL_free(s);
 135                 if ((s = i2s_ASN1_INTEGER(NULL, aor->u.range->max)) == NULL)
 136                     return 0;
 137                 BIO_printf(out, "%s\n", s);
 138                 OPENSSL_free(s);
 139                 break;
 140             default:
 141                 return 0;
 142             }
 143         }
 144         break;
 145     default:
 146         return 0;
 147     }
 148     return 1;
 149 }
 150
 151 /*
 152  * i2r method for an ASIdentifier extension.
 153  */
 154 static int i2r_ASIdentifiers(const X509V3_EXT_METHOD *method,
 155                              void *ext, BIO *out, int indent)
 156 {
 157     ASIdentifiers *asid = ext;
 158     return (i2r_ASIdentifierChoice(out, asid->asnum, indent,
 159                                    "Autonomous System Numbers") &&
 160             i2r_ASIdentifierChoice(out, asid->rdi, indent,
 161                                    "Routing Domain Identifiers"));
 162 }
 163
 164 /*
 165  * Sort comparision function for a sequence of ASIdOrRange elements.
 166  */
 167 static int ASIdOrRange_cmp(const ASIdOrRange *const *a_,
 168                            const ASIdOrRange *const *b_)
 169 {
 170     const ASIdOrRange *a = *a_, *b = *b_;
 171
 172     OPENSSL_assert((a->type == ASIdOrRange_id && a->u.id != NULL) ||
 173                    (a->type == ASIdOrRange_range && a->u.range != NULL &&
 174                     a->u.range->min != NULL && a->u.range->max != NULL));
 175
 176     OPENSSL_assert((b->type == ASIdOrRange_id && b->u.id != NULL) ||
 177                    (b->type == ASIdOrRange_range && b->u.range != NULL &&
 178                     b->u.range->min != NULL && b->u.range->max != NULL));
 179
 180     if (a->type == ASIdOrRange_id && b->type == ASIdOrRange_id)
 181         return ASN1_INTEGER_cmp(a->u.id, b->u.id);
 182
 183     if (a->type == ASIdOrRange_range && b->type == ASIdOrRange_range) {
 184         int r = ASN1_INTEGER_cmp(a->u.range->min, b->u.range->min);
 185         return r != 0 ? r : ASN1_INTEGER_cmp(a->u.range->max,
 186                                              b->u.range->max);
 187     }
 188
 189     if (a->type == ASIdOrRange_id)
 190         return ASN1_INTEGER_cmp(a->u.id, b->u.range->min);
 191     else
 192         return ASN1_INTEGER_cmp(a->u.range->min, b->u.id);
 193 }
 194
 195 /*
 196  * Add an inherit element.
 197  */
 198 int v3_asid_add_inherit(ASIdentifiers *asid, int which)
 199 {
 200     ASIdentifierChoice **choice;
 201     if (asid == NULL)
 202         return 0;
 203     switch (which) {
 204     case V3_ASID_ASNUM:
 205         choice = &asid->asnum;
 206         break;
 207     case V3_ASID_RDI:
 208         choice = &asid->rdi;
 209         break;
 210     default:
 211         return 0;
 212     }
 213     if (*choice == NULL) {
 214         if ((*choice = ASIdentifierChoice_new()) == NULL)
 215             return 0;
 216         OPENSSL_assert((*choice)->u.inherit == NULL);
 217         if (((*choice)->u.inherit = ASN1_NULL_new()) == NULL)
 218             return 0;
 219         (*choice)->type = ASIdentifierChoice_inherit;
 220     }
 221     return (*choice)->type == ASIdentifierChoice_inherit;
 222 }
 223
 224 /*
 225  * Add an ID or range to an ASIdentifierChoice.
 226  */
 227 int v3_asid_add_id_or_range(ASIdentifiers *asid,
 228                             int which, ASN1_INTEGER *min, ASN1_INTEGER *max)
 229 {
 230     ASIdentifierChoice **choice;
 231     ASIdOrRange *aor;
 232     if (asid == NULL)
 233         return 0;
 234     switch (which) {
 235     case V3_ASID_ASNUM:
 236         choice = &asid->asnum;
 237         break;
 238     case V3_ASID_RDI:
 239         choice = &asid->rdi;
 240         break;
 241     default:
 242         return 0;
 243     }
 244     if (*choice != NULL && (*choice)->type == ASIdentifierChoice_inherit)
 245         return 0;
 246     if (*choice == NULL) {
 247         if ((*choice = ASIdentifierChoice_new()) == NULL)
 248             return 0;
 249         OPENSSL_assert((*choice)->u.asIdsOrRanges == NULL);
 250         (*choice)->u.asIdsOrRanges = sk_ASIdOrRange_new(ASIdOrRange_cmp);
 251         if ((*choice)->u.asIdsOrRanges == NULL)
 252             return 0;
 253         (*choice)->type = ASIdentifierChoice_asIdsOrRanges;
 254     }
 255     if ((aor = ASIdOrRange_new()) == NULL)
 256         return 0;
 257     if (max == NULL) {
 258         aor->type = ASIdOrRange_id;
 259         aor->u.id = min;
 260     } else {
 261         aor->type = ASIdOrRange_range;
 262         if ((aor->u.range = ASRange_new()) == NULL)
 263             goto err;
 264         ASN1_INTEGER_free(aor->u.range->min);
 265         aor->u.range->min = min;
 266         ASN1_INTEGER_free(aor->u.range->max);
 267         aor->u.range->max = max;
 268     }
 269     if (!(sk_ASIdOrRange_push((*choice)->u.asIdsOrRanges, aor)))
 270         goto err;
 271     return 1;
 272
 273  err:
 274     ASIdOrRange_free(aor);
 275     return 0;
 276 }
 277
 278 /*
 279  * Extract min and max values from an ASIdOrRange.
 280  */
 281 static void extract_min_max(ASIdOrRange *aor,
 282                             ASN1_INTEGER **min, ASN1_INTEGER **max)
 283 {
 284     OPENSSL_assert(aor != NULL && min != NULL && max != NULL);
 285     switch (aor->type) {
 286     case ASIdOrRange_id:
 287         *min = aor->u.id;
 288         *max = aor->u.id;
 289         return;
 290     case ASIdOrRange_range:
 291         *min = aor->u.range->min;
 292         *max = aor->u.range->max;
 293         return;
 294     }
 295 }
 296
 297 /*
 298  * Check whether an ASIdentifierChoice is in canonical form.
 299  */
 300 static int ASIdentifierChoice_is_canonical(ASIdentifierChoice *choice)
 301 {
 302     ASN1_INTEGER *a_max_plus_one = NULL;
 303     BIGNUM *bn = NULL;
 304     int i, ret = 0;
 305
 306     /*
 307      * Empty element or inheritance is canonical.
 308      */
 309     if (choice == NULL || choice->type == ASIdentifierChoice_inherit)
 310         return 1;
 311
 312     /*
 313      * If not a list, or if empty list, it's broken.
 314      */
 315     if (choice->type != ASIdentifierChoice_asIdsOrRanges ||
 316         sk_ASIdOrRange_num(choice->u.asIdsOrRanges) == 0)
 317         return 0;
 318
 319     /*
 320      * It's a list, check it.
 321      */
 322     for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1; i++) {
 323         ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
 324         ASIdOrRange *b = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i + 1);
 325         ASN1_INTEGER *a_min, *a_max, *b_min, *b_max;
 326
 327         extract_min_max(a, &a_min, &a_max);
 328         extract_min_max(b, &b_min, &b_max);
 329
 330         /*
 331          * Punt misordered list, overlapping start, or inverted range.
 332          */
 333         if (ASN1_INTEGER_cmp(a_min, b_min) >= 0 ||
 334             ASN1_INTEGER_cmp(a_min, a_max) > 0 ||
 335             ASN1_INTEGER_cmp(b_min, b_max) > 0)
 336             goto done;
 337
 338         /*
 339          * Calculate a_max + 1 to check for adjacency.
 340          */
 341         if ((bn == NULL && (bn = BN_new()) == NULL) ||
 342             ASN1_INTEGER_to_BN(a_max, bn) == NULL ||
 343             !BN_add_word(bn, 1) ||
 344             (a_max_plus_one =
 345              BN_to_ASN1_INTEGER(bn, a_max_plus_one)) == NULL) {
 346             X509V3err(X509V3_F_ASIDENTIFIERCHOICE_IS_CANONICAL,
 347                       ERR_R_MALLOC_FAILURE);
 348             goto done;
 349         }
 350
 351         /*
 352          * Punt if adjacent or overlapping.
 353          */
 354         if (ASN1_INTEGER_cmp(a_max_plus_one, b_min) >= 0)
 355             goto done;
 356     }
 357
 358     /*
 359      * Check for inverted range.
 360      */
 361     i = sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1;
 362     {
 363         ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
 364         ASN1_INTEGER *a_min, *a_max;
 365         if (a != NULL && a->type == ASIdOrRange_range) {
 366             extract_min_max(a, &a_min, &a_max);
 367             if (ASN1_INTEGER_cmp(a_min, a_max) > 0)
 368                 goto done;
 369         }
 370     }
 371
 372     ret = 1;
 373
 374  done:
 375     ASN1_INTEGER_free(a_max_plus_one);
 376     BN_free(bn);
 377     return ret;
 378 }
 379
 380 /*
 381  * Check whether an ASIdentifier extension is in canonical form.
 382  */
 383 int v3_asid_is_canonical(ASIdentifiers *asid)
 384 {
 385     return (asid == NULL ||
 386             (ASIdentifierChoice_is_canonical(asid->asnum) &&
 387              ASIdentifierChoice_is_canonical(asid->rdi)));
 388 }
 389
 390 /*
 391  * Whack an ASIdentifierChoice into canonical form.
 392  */
 393 static int ASIdentifierChoice_canonize(ASIdentifierChoice *choice)
 394 {
 395     ASN1_INTEGER *a_max_plus_one = NULL;
 396     BIGNUM *bn = NULL;
 397     int i, ret = 0;
 398
 399     /*
 400      * Nothing to do for empty element or inheritance.
 401      */
 402     if (choice == NULL || choice->type == ASIdentifierChoice_inherit)
 403         return 1;
 404
 405     /*
 406      * If not a list, or if empty list, it's broken.
 407      */
 408     if (choice->type != ASIdentifierChoice_asIdsOrRanges ||
 409         sk_ASIdOrRange_num(choice->u.asIdsOrRanges) == 0) {
 410         X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
 411                   X509V3_R_EXTENSION_VALUE_ERROR);
 412         return 0;
 413     }
 414
 415     /*
 416      * We have a non-empty list.  Sort it.
 417      */
 418     sk_ASIdOrRange_sort(choice->u.asIdsOrRanges);
 419
 420     /*
 421      * Now check for errors and suboptimal encoding, rejecting the
 422      * former and fixing the latter.
 423      */
 424     for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1; i++) {
 425         ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
 426         ASIdOrRange *b = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i + 1);
 427         ASN1_INTEGER *a_min, *a_max, *b_min, *b_max;
 428
 429         extract_min_max(a, &a_min, &a_max);
 430         extract_min_max(b, &b_min, &b_max);
 431
 432         /*
 433          * Make sure we're properly sorted (paranoia).
 434          */
 435         OPENSSL_assert(ASN1_INTEGER_cmp(a_min, b_min) <= 0);
 436
 437         /*
 438          * Punt inverted ranges.
 439          */
 440         if (ASN1_INTEGER_cmp(a_min, a_max) > 0 ||
 441             ASN1_INTEGER_cmp(b_min, b_max) > 0)
 442             goto done;
 443
 444         /*
 445          * Check for overlaps.
 446          */
 447         if (ASN1_INTEGER_cmp(a_max, b_min) >= 0) {
 448             X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
 449                       X509V3_R_EXTENSION_VALUE_ERROR);
 450             goto done;
 451         }
 452
 453         /*
 454          * Calculate a_max + 1 to check for adjacency.
 455          */
 456         if ((bn == NULL && (bn = BN_new()) == NULL) ||
 457             ASN1_INTEGER_to_BN(a_max, bn) == NULL ||
 458             !BN_add_word(bn, 1) ||
 459             (a_max_plus_one =
 460              BN_to_ASN1_INTEGER(bn, a_max_plus_one)) == NULL) {
 461             X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
 462                       ERR_R_MALLOC_FAILURE);
 463             goto done;
 464         }
 465
 466         /*
 467          * If a and b are adjacent, merge them.
 468          */
 469         if (ASN1_INTEGER_cmp(a_max_plus_one, b_min) == 0) {
 470             ASRange *r;
 471             switch (a->type) {
 472             case ASIdOrRange_id:
 473                 if ((r = OPENSSL_malloc(sizeof(ASRange))) == NULL) {
 474                     X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
 475                               ERR_R_MALLOC_FAILURE);
 476                     goto done;
 477                 }
 478                 r->min = a_min;
 479                 r->max = b_max;
 480                 a->type = ASIdOrRange_range;
 481                 a->u.range = r;
 482                 break;
 483             case ASIdOrRange_range:
 484                 ASN1_INTEGER_free(a->u.range->max);
 485                 a->u.range->max = b_max;
 486                 break;
 487             }
 488             switch (b->type) {
 489             case ASIdOrRange_id:
 490                 b->u.id = NULL;
 491                 break;
 492             case ASIdOrRange_range:
 493                 b->u.range->max = NULL;
 494                 break;
 495             }
 496             ASIdOrRange_free(b);
 497             (void)sk_ASIdOrRange_delete(choice->u.asIdsOrRanges, i + 1);
 498             i--;
 499             continue;
 500         }
 501     }
 502
 503     /*
 504      * Check for final inverted range.
 505      */
 506     i = sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1;
 507     {
 508         ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
 509         ASN1_INTEGER *a_min, *a_max;
 510         if (a != NULL && a->type == ASIdOrRange_range) {
 511             extract_min_max(a, &a_min, &a_max);
 512             if (ASN1_INTEGER_cmp(a_min, a_max) > 0)
 513                 goto done;
 514         }
 515     }
 516
 517     OPENSSL_assert(ASIdentifierChoice_is_canonical(choice)); /* Paranoia */
 518
 519     ret = 1;
 520
 521  done:
 522     ASN1_INTEGER_free(a_max_plus_one);
 523     BN_free(bn);
 524     return ret;
 525 }
 526
 527 /*
 528  * Whack an ASIdentifier extension into canonical form.
 529  */
 530 int v3_asid_canonize(ASIdentifiers *asid)
 531 {
 532     return (asid == NULL ||
 533             (ASIdentifierChoice_canonize(asid->asnum) &&
 534              ASIdentifierChoice_canonize(asid->rdi)));
 535 }
 536
 537 /*
 538  * v2i method for an ASIdentifier extension.
 539  */
 540 static void *v2i_ASIdentifiers(const struct v3_ext_method *method,
 541                                struct v3_ext_ctx *ctx,
 542                                STACK_OF(CONF_VALUE) *values)
 543 {
 544     ASN1_INTEGER *min = NULL, *max = NULL;
 545     ASIdentifiers *asid = NULL;
 546     int i;
 547
 548     if ((asid = ASIdentifiers_new()) == NULL) {
 549         X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
 550         return NULL;
 551     }
 552
 553     for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
 554         CONF_VALUE *val = sk_CONF_VALUE_value(values, i);
 555         int i1, i2, i3, is_range, which;
 556
 557         /*
 558          * Figure out whether this is an AS or an RDI.
 559          */
 560         if (!name_cmp(val->name, "AS")) {
 561             which = V3_ASID_ASNUM;
 562         } else if (!name_cmp(val->name, "RDI")) {
 563             which = V3_ASID_RDI;
 564         } else {
 565             X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
 566                       X509V3_R_EXTENSION_NAME_ERROR);
 567             X509V3_conf_err(val);
 568             goto err;
 569         }
 570
 571         /*
 572          * Handle inheritance.
 573          */
 574         if (!strcmp(val->value, "inherit")) {
 575             if (v3_asid_add_inherit(asid, which))
 576                 continue;
 577             X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
 578                       X509V3_R_INVALID_INHERITANCE);
 579             X509V3_conf_err(val);
 580             goto err;
 581         }
 582
 583         /*
 584          * Number, range, or mistake, pick it apart and figure out which.
 585          */
 586         i1 = strspn(val->value, "0123456789");
 587         if (val->value[i1] == '\0') {
 588             is_range = 0;
 589         } else {
 590             is_range = 1;
 591             i2 = i1 + strspn(val->value + i1, " \t");
 592             if (val->value[i2] != '-') {
 593                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
 594                           X509V3_R_INVALID_ASNUMBER);
 595                 X509V3_conf_err(val);
 596                 goto err;
 597             }
 598             i2++;
 599             i2 = i2 + strspn(val->value + i2, " \t");
 600             i3 = i2 + strspn(val->value + i2, "0123456789");
 601             if (val->value[i3] != '\0') {
 602                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
 603                           X509V3_R_INVALID_ASRANGE);
 604                 X509V3_conf_err(val);
 605                 goto err;
 606             }
 607         }
 608
 609         /*
 610          * Syntax is ok, read and add it.
 611          */
 612         if (!is_range) {
 613             if (!X509V3_get_value_int(val, &min)) {
 614                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
 615                 goto err;
 616             }
 617         } else {
 618             char *s = BUF_strdup(val->value);
 619             if (s == NULL) {
 620                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
 621                 goto err;
 622             }
 623             s[i1] = '\0';
 624             min = s2i_ASN1_INTEGER(NULL, s);
 625             max = s2i_ASN1_INTEGER(NULL, s + i2);
 626             OPENSSL_free(s);
 627             if (min == NULL || max == NULL) {
 628                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
 629                 goto err;
 630             }
 631             if (ASN1_INTEGER_cmp(min, max) > 0) {
 632                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
 633                           X509V3_R_EXTENSION_VALUE_ERROR);
 634                 goto err;
 635             }
 636         }
 637         if (!v3_asid_add_id_or_range(asid, which, min, max)) {
 638             X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
 639             goto err;
 640         }
 641         min = max = NULL;
 642     }
 643
 644     /*
 645      * Canonize the result, then we're done.
 646      */
 647     if (!v3_asid_canonize(asid))
 648         goto err;
 649     return asid;
 650
 651  err:
 652     ASIdentifiers_free(asid);
 653     ASN1_INTEGER_free(min);
 654     ASN1_INTEGER_free(max);
 655     return NULL;
 656 }
 657
 658 /*
 659  * OpenSSL dispatch.
 660  */
 661 const X509V3_EXT_METHOD v3_asid = {
 662     NID_sbgp_autonomousSysNum,  /* nid */
 663     0,                          /* flags */
 664     ASN1_ITEM_ref(ASIdentifiers), /* template */
 665     0, 0, 0, 0,                 /* old functions, ignored */
 666     0,                          /* i2s */
 667     0,                          /* s2i */
 668     0,                          /* i2v */
 669     v2i_ASIdentifiers,          /* v2i */
 670     i2r_ASIdentifiers,          /* i2r */
 671     0,                          /* r2i */
 672     NULL                        /* extension-specific data */
 673 };
 674
 675 /*
 676  * Figure out whether extension uses inheritance.
 677  */
 678 int v3_asid_inherits(ASIdentifiers *asid)
 679 {
 680     return (asid != NULL &&
 681             ((asid->asnum != NULL &&
 682               asid->asnum->type == ASIdentifierChoice_inherit) ||
 683              (asid->rdi != NULL &&
 684               asid->rdi->type == ASIdentifierChoice_inherit)));
 685 }
 686
 687 /*
 688  * Figure out whether parent contains child.
 689  */
 690 static int asid_contains(ASIdOrRanges *parent, ASIdOrRanges *child)
 691 {
 692     ASN1_INTEGER *p_min, *p_max, *c_min, *c_max;
 693     int p, c;
 694
 695     if (child == NULL || parent == child)
 696         return 1;
 697     if (parent == NULL)
 698         return 0;
 699
 700     p = 0;
 701     for (c = 0; c < sk_ASIdOrRange_num(child); c++) {
 702         extract_min_max(sk_ASIdOrRange_value(child, c), &c_min, &c_max);
 703         for (;; p++) {
 704             if (p >= sk_ASIdOrRange_num(parent))
 705                 return 0;
 706             extract_min_max(sk_ASIdOrRange_value(parent, p), &p_min, &p_max);
 707             if (ASN1_INTEGER_cmp(p_max, c_max) < 0)
 708                 continue;
 709             if (ASN1_INTEGER_cmp(p_min, c_min) > 0)
 710                 return 0;
 711             break;
 712         }
 713     }
 714
 715     return 1;
 716 }
 717
 718 /*
 719  * Test whether a is a subet of b.
 720  */
 721 int v3_asid_subset(ASIdentifiers *a, ASIdentifiers *b)
 722 {
 723     return (a == NULL ||
 724             a == b ||
 725             (b != NULL &&
 726              !v3_asid_inherits(a) &&
 727              !v3_asid_inherits(b) &&
 728              asid_contains(b->asnum->u.asIdsOrRanges,
 729                            a->asnum->u.asIdsOrRanges) &&
 730              asid_contains(b->rdi->u.asIdsOrRanges,
 731                            a->rdi->u.asIdsOrRanges)));
 732 }
 733
 734 /*
 735  * Validation error handling via callback.
 736  */
 737 # define validation_err(_err_)           \
 738   do {                                  \
 739     if (ctx != NULL) {                  \
 740       ctx->error = _err_;               \
 741       ctx->error_depth = i;             \
 742       ctx->current_cert = x;            \
 743       ret = ctx->verify_cb(0, ctx);     \
 744     } else {                            \
 745       ret = 0;                          \
 746     }                                   \
 747     if (!ret)                           \
 748       goto done;                        \
 749   } while (0)
 750
 751 /*
 752  * Core code for RFC 3779 3.3 path validation.
 753  */
 754 static int v3_asid_validate_path_internal(X509_STORE_CTX *ctx,
 755                                           STACK_OF(X509) *chain,
 756                                           ASIdentifiers *ext)
 757 {
 758     ASIdOrRanges *child_as = NULL, *child_rdi = NULL;
 759     int i, ret = 1, inherit_as = 0, inherit_rdi = 0;
 760     X509 *x;
 761
 762     OPENSSL_assert(chain != NULL && sk_X509_num(chain) > 0);
 763     OPENSSL_assert(ctx != NULL || ext != NULL);
 764     OPENSSL_assert(ctx == NULL || ctx->verify_cb != NULL);
 765
 766     /*
 767      * Figure out where to start.  If we don't have an extension to
 768      * check, we're done.  Otherwise, check canonical form and
 769      * set up for walking up the chain.
 770      */
 771     if (ext != NULL) {
 772         i = -1;
 773         x = NULL;
 774     } else {
 775         i = 0;
 776         x = sk_X509_value(chain, i);
 777         OPENSSL_assert(x != NULL);
 778         if ((ext = x->rfc3779_asid) == NULL)
 779             goto done;
 780     }
 781     if (!v3_asid_is_canonical(ext))
 782         validation_err(X509_V_ERR_INVALID_EXTENSION);
 783     if (ext->asnum != NULL) {
 784         switch (ext->asnum->type) {
 785         case ASIdentifierChoice_inherit:
 786             inherit_as = 1;
 787             break;
 788         case ASIdentifierChoice_asIdsOrRanges:
 789             child_as = ext->asnum->u.asIdsOrRanges;
 790             break;
 791         }
 792     }
 793     if (ext->rdi != NULL) {
 794         switch (ext->rdi->type) {
 795         case ASIdentifierChoice_inherit:
 796             inherit_rdi = 1;
 797             break;
 798         case ASIdentifierChoice_asIdsOrRanges:
 799             child_rdi = ext->rdi->u.asIdsOrRanges;
 800             break;
 801         }
 802     }
 803
 804     /*
 805      * Now walk up the chain.  Extensions must be in canonical form, no
 806      * cert may list resources that its parent doesn't list.
 807      */
 808     for (i++; i < sk_X509_num(chain); i++) {
 809         x = sk_X509_value(chain, i);
 810         OPENSSL_assert(x != NULL);
 811         if (x->rfc3779_asid == NULL) {
 812             if (child_as != NULL || child_rdi != NULL)
 813                 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 814             continue;
 815         }
 816         if (!v3_asid_is_canonical(x->rfc3779_asid))
 817             validation_err(X509_V_ERR_INVALID_EXTENSION);
 818         if (x->rfc3779_asid->asnum == NULL && child_as != NULL) {
 819             validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 820             child_as = NULL;
 821             inherit_as = 0;
 822         }
 823         if (x->rfc3779_asid->asnum != NULL &&
 824             x->rfc3779_asid->asnum->type ==
 825             ASIdentifierChoice_asIdsOrRanges) {
 826             if (inherit_as
 827                 || asid_contains(x->rfc3779_asid->asnum->u.asIdsOrRanges,
 828                                  child_as)) {
 829                 child_as = x->rfc3779_asid->asnum->u.asIdsOrRanges;
 830                 inherit_as = 0;
 831             } else {
 832                 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 833             }
 834         }
 835         if (x->rfc3779_asid->rdi == NULL && child_rdi != NULL) {
 836             validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 837             child_rdi = NULL;
 838             inherit_rdi = 0;
 839         }
 840         if (x->rfc3779_asid->rdi != NULL &&
 841             x->rfc3779_asid->rdi->type == ASIdentifierChoice_asIdsOrRanges) {
 842             if (inherit_rdi ||
 843                 asid_contains(x->rfc3779_asid->rdi->u.asIdsOrRanges,
 844                               child_rdi)) {
 845                 child_rdi = x->rfc3779_asid->rdi->u.asIdsOrRanges;
 846                 inherit_rdi = 0;
 847             } else {
 848                 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 849             }
 850         }
 851     }
 852
 853     /*
 854      * Trust anchor can't inherit.
 855      */
 856     OPENSSL_assert(x != NULL);
 857     if (x->rfc3779_asid != NULL) {
 858         if (x->rfc3779_asid->asnum != NULL &&
 859             x->rfc3779_asid->asnum->type == ASIdentifierChoice_inherit)
 860             validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 861         if (x->rfc3779_asid->rdi != NULL &&
 862             x->rfc3779_asid->rdi->type == ASIdentifierChoice_inherit)
 863             validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 864     }
 865
 866  done:
 867     return ret;
 868 }
 869
 870 # undef validation_err
 871
 872 /*
 873  * RFC 3779 3.3 path validation -- called from X509_verify_cert().
 874  */
 875 int v3_asid_validate_path(X509_STORE_CTX *ctx)
 876 {
 877     return v3_asid_validate_path_internal(ctx, ctx->chain, NULL);
 878 }
 879
 880 /*
 881  * RFC 3779 3.3 path validation of an extension.
 882  * Test whether chain covers extension.
 883  */
 884 int v3_asid_validate_resource_set(STACK_OF(X509) *chain,
 885                                   ASIdentifiers *ext, int allow_inheritance)
 886 {
 887     if (ext == NULL)
 888         return 1;
 889     if (chain == NULL || sk_X509_num(chain) == 0)
 890         return 0;
 891     if (!allow_inheritance && v3_asid_inherits(ext))
 892         return 0;
 893     return v3_asid_validate_path_internal(NULL, chain, ext);
 894 }
 895
 896 #endif                          /* OPENSSL_NO_RFC3779 */