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 "internal/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 "internal/x509_int.h"
  71 #include <openssl/bn.h>
  72 #include "ext_dat.h"
  73
  74 #ifndef OPENSSL_NO_RFC3779
  75
  76 /*
  77  * OpenSSL ASN.1 template translation of RFC 3779 3.2.3.
  78  */
  79
  80 ASN1_SEQUENCE(ASRange) = {
  81   ASN1_SIMPLE(ASRange, min, ASN1_INTEGER),
  82   ASN1_SIMPLE(ASRange, max, ASN1_INTEGER)
  83 } ASN1_SEQUENCE_END(ASRange)
  84
  85 ASN1_CHOICE(ASIdOrRange) = {
  86   ASN1_SIMPLE(ASIdOrRange, u.id,    ASN1_INTEGER),
  87   ASN1_SIMPLE(ASIdOrRange, u.range, ASRange)
  88 } ASN1_CHOICE_END(ASIdOrRange)
  89
  90 ASN1_CHOICE(ASIdentifierChoice) = {
  91   ASN1_SIMPLE(ASIdentifierChoice,      u.inherit,       ASN1_NULL),
  92   ASN1_SEQUENCE_OF(ASIdentifierChoice, u.asIdsOrRanges, ASIdOrRange)
  93 } ASN1_CHOICE_END(ASIdentifierChoice)
  94
  95 ASN1_SEQUENCE(ASIdentifiers) = {
  96   ASN1_EXP_OPT(ASIdentifiers, asnum, ASIdentifierChoice, 0),
  97   ASN1_EXP_OPT(ASIdentifiers, rdi,   ASIdentifierChoice, 1)
  98 } ASN1_SEQUENCE_END(ASIdentifiers)
  99
 100 IMPLEMENT_ASN1_FUNCTIONS(ASRange)
 101 IMPLEMENT_ASN1_FUNCTIONS(ASIdOrRange)
 102 IMPLEMENT_ASN1_FUNCTIONS(ASIdentifierChoice)
 103 IMPLEMENT_ASN1_FUNCTIONS(ASIdentifiers)
 104
 105 /*
 106  * i2r method for an ASIdentifierChoice.
 107  */
 108 static int i2r_ASIdentifierChoice(BIO *out,
 109                                   ASIdentifierChoice *choice,
 110                                   int indent, const char *msg)
 111 {
 112     int i;
 113     char *s;
 114     if (choice == NULL)
 115         return 1;
 116     BIO_printf(out, "%*s%s:\n", indent, "", msg);
 117     switch (choice->type) {
 118     case ASIdentifierChoice_inherit:
 119         BIO_printf(out, "%*sinherit\n", indent + 2, "");
 120         break;
 121     case ASIdentifierChoice_asIdsOrRanges:
 122         for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges); i++) {
 123             ASIdOrRange *aor =
 124                 sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
 125             switch (aor->type) {
 126             case ASIdOrRange_id:
 127                 if ((s = i2s_ASN1_INTEGER(NULL, aor->u.id)) == NULL)
 128                     return 0;
 129                 BIO_printf(out, "%*s%s\n", indent + 2, "", s);
 130                 OPENSSL_free(s);
 131                 break;
 132             case ASIdOrRange_range:
 133                 if ((s = i2s_ASN1_INTEGER(NULL, aor->u.range->min)) == NULL)
 134                     return 0;
 135                 BIO_printf(out, "%*s%s-", indent + 2, "", s);
 136                 OPENSSL_free(s);
 137                 if ((s = i2s_ASN1_INTEGER(NULL, aor->u.range->max)) == NULL)
 138                     return 0;
 139                 BIO_printf(out, "%s\n", s);
 140                 OPENSSL_free(s);
 141                 break;
 142             default:
 143                 return 0;
 144             }
 145         }
 146         break;
 147     default:
 148         return 0;
 149     }
 150     return 1;
 151 }
 152
 153 /*
 154  * i2r method for an ASIdentifier extension.
 155  */
 156 static int i2r_ASIdentifiers(const X509V3_EXT_METHOD *method,
 157                              void *ext, BIO *out, int indent)
 158 {
 159     ASIdentifiers *asid = ext;
 160     return (i2r_ASIdentifierChoice(out, asid->asnum, indent,
 161                                    "Autonomous System Numbers") &&
 162             i2r_ASIdentifierChoice(out, asid->rdi, indent,
 163                                    "Routing Domain Identifiers"));
 164 }
 165
 166 /*
 167  * Sort comparision function for a sequence of ASIdOrRange elements.
 168  */
 169 static int ASIdOrRange_cmp(const ASIdOrRange *const *a_,
 170                            const ASIdOrRange *const *b_)
 171 {
 172     const ASIdOrRange *a = *a_, *b = *b_;
 173
 174     OPENSSL_assert((a->type == ASIdOrRange_id && a->u.id != NULL) ||
 175                    (a->type == ASIdOrRange_range && a->u.range != NULL &&
 176                     a->u.range->min != NULL && a->u.range->max != NULL));
 177
 178     OPENSSL_assert((b->type == ASIdOrRange_id && b->u.id != NULL) ||
 179                    (b->type == ASIdOrRange_range && b->u.range != NULL &&
 180                     b->u.range->min != NULL && b->u.range->max != NULL));
 181
 182     if (a->type == ASIdOrRange_id && b->type == ASIdOrRange_id)
 183         return ASN1_INTEGER_cmp(a->u.id, b->u.id);
 184
 185     if (a->type == ASIdOrRange_range && b->type == ASIdOrRange_range) {
 186         int r = ASN1_INTEGER_cmp(a->u.range->min, b->u.range->min);
 187         return r != 0 ? r : ASN1_INTEGER_cmp(a->u.range->max,
 188                                              b->u.range->max);
 189     }
 190
 191     if (a->type == ASIdOrRange_id)
 192         return ASN1_INTEGER_cmp(a->u.id, b->u.range->min);
 193     else
 194         return ASN1_INTEGER_cmp(a->u.range->min, b->u.id);
 195 }
 196
 197 /*
 198  * Add an inherit element.
 199  */
 200 int v3_asid_add_inherit(ASIdentifiers *asid, int which)
 201 {
 202     ASIdentifierChoice **choice;
 203     if (asid == NULL)
 204         return 0;
 205     switch (which) {
 206     case V3_ASID_ASNUM:
 207         choice = &asid->asnum;
 208         break;
 209     case V3_ASID_RDI:
 210         choice = &asid->rdi;
 211         break;
 212     default:
 213         return 0;
 214     }
 215     if (*choice == NULL) {
 216         if ((*choice = ASIdentifierChoice_new()) == NULL)
 217             return 0;
 218         OPENSSL_assert((*choice)->u.inherit == NULL);
 219         if (((*choice)->u.inherit = ASN1_NULL_new()) == NULL)
 220             return 0;
 221         (*choice)->type = ASIdentifierChoice_inherit;
 222     }
 223     return (*choice)->type == ASIdentifierChoice_inherit;
 224 }
 225
 226 /*
 227  * Add an ID or range to an ASIdentifierChoice.
 228  */
 229 int v3_asid_add_id_or_range(ASIdentifiers *asid,
 230                             int which, ASN1_INTEGER *min, ASN1_INTEGER *max)
 231 {
 232     ASIdentifierChoice **choice;
 233     ASIdOrRange *aor;
 234     if (asid == NULL)
 235         return 0;
 236     switch (which) {
 237     case V3_ASID_ASNUM:
 238         choice = &asid->asnum;
 239         break;
 240     case V3_ASID_RDI:
 241         choice = &asid->rdi;
 242         break;
 243     default:
 244         return 0;
 245     }
 246     if (*choice != NULL && (*choice)->type == ASIdentifierChoice_inherit)
 247         return 0;
 248     if (*choice == NULL) {
 249         if ((*choice = ASIdentifierChoice_new()) == NULL)
 250             return 0;
 251         OPENSSL_assert((*choice)->u.asIdsOrRanges == NULL);
 252         (*choice)->u.asIdsOrRanges = sk_ASIdOrRange_new(ASIdOrRange_cmp);
 253         if ((*choice)->u.asIdsOrRanges == NULL)
 254             return 0;
 255         (*choice)->type = ASIdentifierChoice_asIdsOrRanges;
 256     }
 257     if ((aor = ASIdOrRange_new()) == NULL)
 258         return 0;
 259     if (max == NULL) {
 260         aor->type = ASIdOrRange_id;
 261         aor->u.id = min;
 262     } else {
 263         aor->type = ASIdOrRange_range;
 264         if ((aor->u.range = ASRange_new()) == NULL)
 265             goto err;
 266         ASN1_INTEGER_free(aor->u.range->min);
 267         aor->u.range->min = min;
 268         ASN1_INTEGER_free(aor->u.range->max);
 269         aor->u.range->max = max;
 270     }
 271     if (!(sk_ASIdOrRange_push((*choice)->u.asIdsOrRanges, aor)))
 272         goto err;
 273     return 1;
 274
 275  err:
 276     ASIdOrRange_free(aor);
 277     return 0;
 278 }
 279
 280 /*
 281  * Extract min and max values from an ASIdOrRange.
 282  */
 283 static void extract_min_max(ASIdOrRange *aor,
 284                             ASN1_INTEGER **min, ASN1_INTEGER **max)
 285 {
 286     OPENSSL_assert(aor != NULL && min != NULL && max != NULL);
 287     switch (aor->type) {
 288     case ASIdOrRange_id:
 289         *min = aor->u.id;
 290         *max = aor->u.id;
 291         return;
 292     case ASIdOrRange_range:
 293         *min = aor->u.range->min;
 294         *max = aor->u.range->max;
 295         return;
 296     }
 297 }
 298
 299 /*
 300  * Check whether an ASIdentifierChoice is in canonical form.
 301  */
 302 static int ASIdentifierChoice_is_canonical(ASIdentifierChoice *choice)
 303 {
 304     ASN1_INTEGER *a_max_plus_one = NULL;
 305     BIGNUM *bn = NULL;
 306     int i, ret = 0;
 307
 308     /*
 309      * Empty element or inheritance is canonical.
 310      */
 311     if (choice == NULL || choice->type == ASIdentifierChoice_inherit)
 312         return 1;
 313
 314     /*
 315      * If not a list, or if empty list, it's broken.
 316      */
 317     if (choice->type != ASIdentifierChoice_asIdsOrRanges ||
 318         sk_ASIdOrRange_num(choice->u.asIdsOrRanges) == 0)
 319         return 0;
 320
 321     /*
 322      * It's a list, check it.
 323      */
 324     for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1; i++) {
 325         ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
 326         ASIdOrRange *b = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i + 1);
 327         ASN1_INTEGER *a_min = NULL, *a_max = NULL, *b_min = NULL, *b_max =
 328             NULL;
 329
 330         extract_min_max(a, &a_min, &a_max);
 331         extract_min_max(b, &b_min, &b_max);
 332
 333         /*
 334          * Punt misordered list, overlapping start, or inverted range.
 335          */
 336         if (ASN1_INTEGER_cmp(a_min, b_min) >= 0 ||
 337             ASN1_INTEGER_cmp(a_min, a_max) > 0 ||
 338             ASN1_INTEGER_cmp(b_min, b_max) > 0)
 339             goto done;
 340
 341         /*
 342          * Calculate a_max + 1 to check for adjacency.
 343          */
 344         if ((bn == NULL && (bn = BN_new()) == NULL) ||
 345             ASN1_INTEGER_to_BN(a_max, bn) == NULL ||
 346             !BN_add_word(bn, 1) ||
 347             (a_max_plus_one =
 348              BN_to_ASN1_INTEGER(bn, a_max_plus_one)) == NULL) {
 349             X509V3err(X509V3_F_ASIDENTIFIERCHOICE_IS_CANONICAL,
 350                       ERR_R_MALLOC_FAILURE);
 351             goto done;
 352         }
 353
 354         /*
 355          * Punt if adjacent or overlapping.
 356          */
 357         if (ASN1_INTEGER_cmp(a_max_plus_one, b_min) >= 0)
 358             goto done;
 359     }
 360
 361     /*
 362      * Check for inverted range.
 363      */
 364     i = sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1;
 365     {
 366         ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
 367         ASN1_INTEGER *a_min, *a_max;
 368         if (a != NULL && a->type == ASIdOrRange_range) {
 369             extract_min_max(a, &a_min, &a_max);
 370             if (ASN1_INTEGER_cmp(a_min, a_max) > 0)
 371                 goto done;
 372         }
 373     }
 374
 375     ret = 1;
 376
 377  done:
 378     ASN1_INTEGER_free(a_max_plus_one);
 379     BN_free(bn);
 380     return ret;
 381 }
 382
 383 /*
 384  * Check whether an ASIdentifier extension is in canonical form.
 385  */
 386 int v3_asid_is_canonical(ASIdentifiers *asid)
 387 {
 388     return (asid == NULL ||
 389             (ASIdentifierChoice_is_canonical(asid->asnum) &&
 390              ASIdentifierChoice_is_canonical(asid->rdi)));
 391 }
 392
 393 /*
 394  * Whack an ASIdentifierChoice into canonical form.
 395  */
 396 static int ASIdentifierChoice_canonize(ASIdentifierChoice *choice)
 397 {
 398     ASN1_INTEGER *a_max_plus_one = NULL;
 399     BIGNUM *bn = NULL;
 400     int i, ret = 0;
 401
 402     /*
 403      * Nothing to do for empty element or inheritance.
 404      */
 405     if (choice == NULL || choice->type == ASIdentifierChoice_inherit)
 406         return 1;
 407
 408     /*
 409      * If not a list, or if empty list, it's broken.
 410      */
 411     if (choice->type != ASIdentifierChoice_asIdsOrRanges ||
 412         sk_ASIdOrRange_num(choice->u.asIdsOrRanges) == 0) {
 413         X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
 414                   X509V3_R_EXTENSION_VALUE_ERROR);
 415         return 0;
 416     }
 417
 418     /*
 419      * We have a non-empty list.  Sort it.
 420      */
 421     sk_ASIdOrRange_sort(choice->u.asIdsOrRanges);
 422
 423     /*
 424      * Now check for errors and suboptimal encoding, rejecting the
 425      * former and fixing the latter.
 426      */
 427     for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1; i++) {
 428         ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
 429         ASIdOrRange *b = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i + 1);
 430         ASN1_INTEGER *a_min = NULL, *a_max = NULL, *b_min = NULL, *b_max =
 431             NULL;
 432
 433         extract_min_max(a, &a_min, &a_max);
 434         extract_min_max(b, &b_min, &b_max);
 435
 436         /*
 437          * Make sure we're properly sorted (paranoia).
 438          */
 439         OPENSSL_assert(ASN1_INTEGER_cmp(a_min, b_min) <= 0);
 440
 441         /*
 442          * Punt inverted ranges.
 443          */
 444         if (ASN1_INTEGER_cmp(a_min, a_max) > 0 ||
 445             ASN1_INTEGER_cmp(b_min, b_max) > 0)
 446             goto done;
 447
 448         /*
 449          * Check for overlaps.
 450          */
 451         if (ASN1_INTEGER_cmp(a_max, b_min) >= 0) {
 452             X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
 453                       X509V3_R_EXTENSION_VALUE_ERROR);
 454             goto done;
 455         }
 456
 457         /*
 458          * Calculate a_max + 1 to check for adjacency.
 459          */
 460         if ((bn == NULL && (bn = BN_new()) == NULL) ||
 461             ASN1_INTEGER_to_BN(a_max, bn) == NULL ||
 462             !BN_add_word(bn, 1) ||
 463             (a_max_plus_one =
 464              BN_to_ASN1_INTEGER(bn, a_max_plus_one)) == NULL) {
 465             X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
 466                       ERR_R_MALLOC_FAILURE);
 467             goto done;
 468         }
 469
 470         /*
 471          * If a and b are adjacent, merge them.
 472          */
 473         if (ASN1_INTEGER_cmp(a_max_plus_one, b_min) == 0) {
 474             ASRange *r;
 475             switch (a->type) {
 476             case ASIdOrRange_id:
 477                 if ((r = OPENSSL_malloc(sizeof(*r))) == NULL) {
 478                     X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
 479                               ERR_R_MALLOC_FAILURE);
 480                     goto done;
 481                 }
 482                 r->min = a_min;
 483                 r->max = b_max;
 484                 a->type = ASIdOrRange_range;
 485                 a->u.range = r;
 486                 break;
 487             case ASIdOrRange_range:
 488                 ASN1_INTEGER_free(a->u.range->max);
 489                 a->u.range->max = b_max;
 490                 break;
 491             }
 492             switch (b->type) {
 493             case ASIdOrRange_id:
 494                 b->u.id = NULL;
 495                 break;
 496             case ASIdOrRange_range:
 497                 b->u.range->max = NULL;
 498                 break;
 499             }
 500             ASIdOrRange_free(b);
 501             (void)sk_ASIdOrRange_delete(choice->u.asIdsOrRanges, i + 1);
 502             i--;
 503             continue;
 504         }
 505     }
 506
 507     /*
 508      * Check for final inverted range.
 509      */
 510     i = sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1;
 511     {
 512         ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
 513         ASN1_INTEGER *a_min, *a_max;
 514         if (a != NULL && a->type == ASIdOrRange_range) {
 515             extract_min_max(a, &a_min, &a_max);
 516             if (ASN1_INTEGER_cmp(a_min, a_max) > 0)
 517                 goto done;
 518         }
 519     }
 520
 521     OPENSSL_assert(ASIdentifierChoice_is_canonical(choice)); /* Paranoia */
 522
 523     ret = 1;
 524
 525  done:
 526     ASN1_INTEGER_free(a_max_plus_one);
 527     BN_free(bn);
 528     return ret;
 529 }
 530
 531 /*
 532  * Whack an ASIdentifier extension into canonical form.
 533  */
 534 int v3_asid_canonize(ASIdentifiers *asid)
 535 {
 536     return (asid == NULL ||
 537             (ASIdentifierChoice_canonize(asid->asnum) &&
 538              ASIdentifierChoice_canonize(asid->rdi)));
 539 }
 540
 541 /*
 542  * v2i method for an ASIdentifier extension.
 543  */
 544 static void *v2i_ASIdentifiers(const struct v3_ext_method *method,
 545                                struct v3_ext_ctx *ctx,
 546                                STACK_OF(CONF_VALUE) *values)
 547 {
 548     ASN1_INTEGER *min = NULL, *max = NULL;
 549     ASIdentifiers *asid = NULL;
 550     int i;
 551
 552     if ((asid = ASIdentifiers_new()) == NULL) {
 553         X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
 554         return NULL;
 555     }
 556
 557     for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
 558         CONF_VALUE *val = sk_CONF_VALUE_value(values, i);
 559         int i1 = 0, i2 = 0, i3 = 0, is_range = 0, which = 0;
 560
 561         /*
 562          * Figure out whether this is an AS or an RDI.
 563          */
 564         if (!name_cmp(val->name, "AS")) {
 565             which = V3_ASID_ASNUM;
 566         } else if (!name_cmp(val->name, "RDI")) {
 567             which = V3_ASID_RDI;
 568         } else {
 569             X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
 570                       X509V3_R_EXTENSION_NAME_ERROR);
 571             X509V3_conf_err(val);
 572             goto err;
 573         }
 574
 575         /*
 576          * Handle inheritance.
 577          */
 578         if (strcmp(val->value, "inherit") == 0) {
 579             if (v3_asid_add_inherit(asid, which))
 580                 continue;
 581             X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
 582                       X509V3_R_INVALID_INHERITANCE);
 583             X509V3_conf_err(val);
 584             goto err;
 585         }
 586
 587         /*
 588          * Number, range, or mistake, pick it apart and figure out which.
 589          */
 590         i1 = strspn(val->value, "0123456789");
 591         if (val->value[i1] == '\0') {
 592             is_range = 0;
 593         } else {
 594             is_range = 1;
 595             i2 = i1 + strspn(val->value + i1, " \t");
 596             if (val->value[i2] != '-') {
 597                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
 598                           X509V3_R_INVALID_ASNUMBER);
 599                 X509V3_conf_err(val);
 600                 goto err;
 601             }
 602             i2++;
 603             i2 = i2 + strspn(val->value + i2, " \t");
 604             i3 = i2 + strspn(val->value + i2, "0123456789");
 605             if (val->value[i3] != '\0') {
 606                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
 607                           X509V3_R_INVALID_ASRANGE);
 608                 X509V3_conf_err(val);
 609                 goto err;
 610             }
 611         }
 612
 613         /*
 614          * Syntax is ok, read and add it.
 615          */
 616         if (!is_range) {
 617             if (!X509V3_get_value_int(val, &min)) {
 618                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
 619                 goto err;
 620             }
 621         } else {
 622             char *s = OPENSSL_strdup(val->value);
 623             if (s == NULL) {
 624                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
 625                 goto err;
 626             }
 627             s[i1] = '\0';
 628             min = s2i_ASN1_INTEGER(NULL, s);
 629             max = s2i_ASN1_INTEGER(NULL, s + i2);
 630             OPENSSL_free(s);
 631             if (min == NULL || max == NULL) {
 632                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
 633                 goto err;
 634             }
 635             if (ASN1_INTEGER_cmp(min, max) > 0) {
 636                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
 637                           X509V3_R_EXTENSION_VALUE_ERROR);
 638                 goto err;
 639             }
 640         }
 641         if (!v3_asid_add_id_or_range(asid, which, min, max)) {
 642             X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
 643             goto err;
 644         }
 645         min = max = NULL;
 646     }
 647
 648     /*
 649      * Canonize the result, then we're done.
 650      */
 651     if (!v3_asid_canonize(asid))
 652         goto err;
 653     return asid;
 654
 655  err:
 656     ASIdentifiers_free(asid);
 657     ASN1_INTEGER_free(min);
 658     ASN1_INTEGER_free(max);
 659     return NULL;
 660 }
 661
 662 /*
 663  * OpenSSL dispatch.
 664  */
 665 const X509V3_EXT_METHOD v3_asid = {
 666     NID_sbgp_autonomousSysNum,  /* nid */
 667     0,                          /* flags */
 668     ASN1_ITEM_ref(ASIdentifiers), /* template */
 669     0, 0, 0, 0,                 /* old functions, ignored */
 670     0,                          /* i2s */
 671     0,                          /* s2i */
 672     0,                          /* i2v */
 673     v2i_ASIdentifiers,          /* v2i */
 674     i2r_ASIdentifiers,          /* i2r */
 675     0,                          /* r2i */
 676     NULL                        /* extension-specific data */
 677 };
 678
 679 /*
 680  * Figure out whether extension uses inheritance.
 681  */
 682 int v3_asid_inherits(ASIdentifiers *asid)
 683 {
 684     return (asid != NULL &&
 685             ((asid->asnum != NULL &&
 686               asid->asnum->type == ASIdentifierChoice_inherit) ||
 687              (asid->rdi != NULL &&
 688               asid->rdi->type == ASIdentifierChoice_inherit)));
 689 }
 690
 691 /*
 692  * Figure out whether parent contains child.
 693  */
 694 static int asid_contains(ASIdOrRanges *parent, ASIdOrRanges *child)
 695 {
 696     ASN1_INTEGER *p_min = NULL, *p_max = NULL, *c_min = NULL, *c_max = NULL;
 697     int p, c;
 698
 699     if (child == NULL || parent == child)
 700         return 1;
 701     if (parent == NULL)
 702         return 0;
 703
 704     p = 0;
 705     for (c = 0; c < sk_ASIdOrRange_num(child); c++) {
 706         extract_min_max(sk_ASIdOrRange_value(child, c), &c_min, &c_max);
 707         for (;; p++) {
 708             if (p >= sk_ASIdOrRange_num(parent))
 709                 return 0;
 710             extract_min_max(sk_ASIdOrRange_value(parent, p), &p_min, &p_max);
 711             if (ASN1_INTEGER_cmp(p_max, c_max) < 0)
 712                 continue;
 713             if (ASN1_INTEGER_cmp(p_min, c_min) > 0)
 714                 return 0;
 715             break;
 716         }
 717     }
 718
 719     return 1;
 720 }
 721
 722 /*
 723  * Test whether a is a subet of b.
 724  */
 725 int v3_asid_subset(ASIdentifiers *a, ASIdentifiers *b)
 726 {
 727     return (a == NULL ||
 728             a == b ||
 729             (b != NULL &&
 730              !v3_asid_inherits(a) &&
 731              !v3_asid_inherits(b) &&
 732              asid_contains(b->asnum->u.asIdsOrRanges,
 733                            a->asnum->u.asIdsOrRanges) &&
 734              asid_contains(b->rdi->u.asIdsOrRanges,
 735                            a->rdi->u.asIdsOrRanges)));
 736 }
 737
 738 /*
 739  * Validation error handling via callback.
 740  */
 741 #define validation_err(_err_)           \
 742   do {                                  \
 743     if (ctx != NULL) {                  \
 744       ctx->error = _err_;               \
 745       ctx->error_depth = i;             \
 746       ctx->current_cert = x;            \
 747       ret = ctx->verify_cb(0, ctx);     \
 748     } else {                            \
 749       ret = 0;                          \
 750     }                                   \
 751     if (!ret)                           \
 752       goto done;                        \
 753   } while (0)
 754
 755 /*
 756  * Core code for RFC 3779 3.3 path validation.
 757  */
 758 static int v3_asid_validate_path_internal(X509_STORE_CTX *ctx,
 759                                           STACK_OF(X509) *chain,
 760                                           ASIdentifiers *ext)
 761 {
 762     ASIdOrRanges *child_as = NULL, *child_rdi = NULL;
 763     int i, ret = 1, inherit_as = 0, inherit_rdi = 0;
 764     X509 *x;
 765
 766     OPENSSL_assert(chain != NULL && sk_X509_num(chain) > 0);
 767     OPENSSL_assert(ctx != NULL || ext != NULL);
 768     OPENSSL_assert(ctx == NULL || ctx->verify_cb != NULL);
 769
 770     /*
 771      * Figure out where to start.  If we don't have an extension to
 772      * check, we're done.  Otherwise, check canonical form and
 773      * set up for walking up the chain.
 774      */
 775     if (ext != NULL) {
 776         i = -1;
 777         x = NULL;
 778     } else {
 779         i = 0;
 780         x = sk_X509_value(chain, i);
 781         OPENSSL_assert(x != NULL);
 782         if ((ext = x->rfc3779_asid) == NULL)
 783             goto done;
 784     }
 785     if (!v3_asid_is_canonical(ext))
 786         validation_err(X509_V_ERR_INVALID_EXTENSION);
 787     if (ext->asnum != NULL) {
 788         switch (ext->asnum->type) {
 789         case ASIdentifierChoice_inherit:
 790             inherit_as = 1;
 791             break;
 792         case ASIdentifierChoice_asIdsOrRanges:
 793             child_as = ext->asnum->u.asIdsOrRanges;
 794             break;
 795         }
 796     }
 797     if (ext->rdi != NULL) {
 798         switch (ext->rdi->type) {
 799         case ASIdentifierChoice_inherit:
 800             inherit_rdi = 1;
 801             break;
 802         case ASIdentifierChoice_asIdsOrRanges:
 803             child_rdi = ext->rdi->u.asIdsOrRanges;
 804             break;
 805         }
 806     }
 807
 808     /*
 809      * Now walk up the chain.  Extensions must be in canonical form, no
 810      * cert may list resources that its parent doesn't list.
 811      */
 812     for (i++; i < sk_X509_num(chain); i++) {
 813         x = sk_X509_value(chain, i);
 814         OPENSSL_assert(x != NULL);
 815         if (x->rfc3779_asid == NULL) {
 816             if (child_as != NULL || child_rdi != NULL)
 817                 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 818             continue;
 819         }
 820         if (!v3_asid_is_canonical(x->rfc3779_asid))
 821             validation_err(X509_V_ERR_INVALID_EXTENSION);
 822         if (x->rfc3779_asid->asnum == NULL && child_as != NULL) {
 823             validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 824             child_as = NULL;
 825             inherit_as = 0;
 826         }
 827         if (x->rfc3779_asid->asnum != NULL &&
 828             x->rfc3779_asid->asnum->type ==
 829             ASIdentifierChoice_asIdsOrRanges) {
 830             if (inherit_as
 831                 || asid_contains(x->rfc3779_asid->asnum->u.asIdsOrRanges,
 832                                  child_as)) {
 833                 child_as = x->rfc3779_asid->asnum->u.asIdsOrRanges;
 834                 inherit_as = 0;
 835             } else {
 836                 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 837             }
 838         }
 839         if (x->rfc3779_asid->rdi == NULL && child_rdi != NULL) {
 840             validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 841             child_rdi = NULL;
 842             inherit_rdi = 0;
 843         }
 844         if (x->rfc3779_asid->rdi != NULL &&
 845             x->rfc3779_asid->rdi->type == ASIdentifierChoice_asIdsOrRanges) {
 846             if (inherit_rdi ||
 847                 asid_contains(x->rfc3779_asid->rdi->u.asIdsOrRanges,
 848                               child_rdi)) {
 849                 child_rdi = x->rfc3779_asid->rdi->u.asIdsOrRanges;
 850                 inherit_rdi = 0;
 851             } else {
 852                 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 853             }
 854         }
 855     }
 856
 857     /*
 858      * Trust anchor can't inherit.
 859      */
 860     OPENSSL_assert(x != NULL);
 861     if (x->rfc3779_asid != NULL) {
 862         if (x->rfc3779_asid->asnum != NULL &&
 863             x->rfc3779_asid->asnum->type == ASIdentifierChoice_inherit)
 864             validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 865         if (x->rfc3779_asid->rdi != NULL &&
 866             x->rfc3779_asid->rdi->type == ASIdentifierChoice_inherit)
 867             validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 868     }
 869
 870  done:
 871     return ret;
 872 }
 873
 874 #undef validation_err
 875
 876 /*
 877  * RFC 3779 3.3 path validation -- called from X509_verify_cert().
 878  */
 879 int v3_asid_validate_path(X509_STORE_CTX *ctx)
 880 {
 881     return v3_asid_validate_path_internal(ctx, ctx->chain, NULL);
 882 }
 883
 884 /*
 885  * RFC 3779 3.3 path validation of an extension.
 886  * Test whether chain covers extension.
 887  */
 888 int v3_asid_validate_resource_set(STACK_OF(X509) *chain,
 889                                   ASIdentifiers *ext, int allow_inheritance)
 890 {
 891     if (ext == NULL)
 892         return 1;
 893     if (chain == NULL || sk_X509_num(chain) == 0)
 894         return 0;
 895     if (!allow_inheritance && v3_asid_inherits(ext))
 896         return 0;
 897     return v3_asid_validate_path_internal(NULL, chain, ext);
 898 }
 899
 900 #endif                          /* OPENSSL_NO_RFC3779 */