crypto/x509/v3_asid.c

   1 /*
   2  * Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*
  11  * Implementation of RFC 3779 section 3.2.
  12  */
  13
  14 #include <assert.h>
  15 #include <stdio.h>
  16 #include <string.h>
  17 #include "internal/cryptlib.h"
  18 #include <openssl/conf.h>
  19 #include <openssl/asn1.h>
  20 #include <openssl/asn1t.h>
  21 #include <openssl/x509v3.h>
  22 #include <openssl/x509.h>
  23 #include "internal/x509_int.h"
  24 #include <openssl/bn.h>
  25 #include "ext_dat.h"
  26
  27 #ifndef OPENSSL_NO_RFC3779
  28
  29 /*
  30  * OpenSSL ASN.1 template translation of RFC 3779 3.2.3.
  31  */
  32
  33 ASN1_SEQUENCE(ASRange) = {
  34   ASN1_SIMPLE(ASRange, min, ASN1_INTEGER),
  35   ASN1_SIMPLE(ASRange, max, ASN1_INTEGER)
  36 } ASN1_SEQUENCE_END(ASRange)
  37
  38 ASN1_CHOICE(ASIdOrRange) = {
  39   ASN1_SIMPLE(ASIdOrRange, u.id,    ASN1_INTEGER),
  40   ASN1_SIMPLE(ASIdOrRange, u.range, ASRange)
  41 } ASN1_CHOICE_END(ASIdOrRange)
  42
  43 ASN1_CHOICE(ASIdentifierChoice) = {
  44   ASN1_SIMPLE(ASIdentifierChoice,      u.inherit,       ASN1_NULL),
  45   ASN1_SEQUENCE_OF(ASIdentifierChoice, u.asIdsOrRanges, ASIdOrRange)
  46 } ASN1_CHOICE_END(ASIdentifierChoice)
  47
  48 ASN1_SEQUENCE(ASIdentifiers) = {
  49   ASN1_EXP_OPT(ASIdentifiers, asnum, ASIdentifierChoice, 0),
  50   ASN1_EXP_OPT(ASIdentifiers, rdi,   ASIdentifierChoice, 1)
  51 } ASN1_SEQUENCE_END(ASIdentifiers)
  52
  53 IMPLEMENT_ASN1_FUNCTIONS(ASRange)
  54 IMPLEMENT_ASN1_FUNCTIONS(ASIdOrRange)
  55 IMPLEMENT_ASN1_FUNCTIONS(ASIdentifierChoice)
  56 IMPLEMENT_ASN1_FUNCTIONS(ASIdentifiers)
  57
  58 /*
  59  * i2r method for an ASIdentifierChoice.
  60  */
  61 static int i2r_ASIdentifierChoice(BIO *out,
  62                                   ASIdentifierChoice *choice,
  63                                   int indent, const char *msg)
  64 {
  65     int i;
  66     char *s;
  67     if (choice == NULL)
  68         return 1;
  69     BIO_printf(out, "%*s%s:\n", indent, "", msg);
  70     switch (choice->type) {
  71     case ASIdentifierChoice_inherit:
  72         BIO_printf(out, "%*sinherit\n", indent + 2, "");
  73         break;
  74     case ASIdentifierChoice_asIdsOrRanges:
  75         for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges); i++) {
  76             ASIdOrRange *aor =
  77                 sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
  78             switch (aor->type) {
  79             case ASIdOrRange_id:
  80                 if ((s = i2s_ASN1_INTEGER(NULL, aor->u.id)) == NULL)
  81                     return 0;
  82                 BIO_printf(out, "%*s%s\n", indent + 2, "", s);
  83                 OPENSSL_free(s);
  84                 break;
  85             case ASIdOrRange_range:
  86                 if ((s = i2s_ASN1_INTEGER(NULL, aor->u.range->min)) == NULL)
  87                     return 0;
  88                 BIO_printf(out, "%*s%s-", indent + 2, "", s);
  89                 OPENSSL_free(s);
  90                 if ((s = i2s_ASN1_INTEGER(NULL, aor->u.range->max)) == NULL)
  91                     return 0;
  92                 BIO_printf(out, "%s\n", s);
  93                 OPENSSL_free(s);
  94                 break;
  95             default:
  96                 return 0;
  97             }
  98         }
  99         break;
 100     default:
 101         return 0;
 102     }
 103     return 1;
 104 }
 105
 106 /*
 107  * i2r method for an ASIdentifier extension.
 108  */
 109 static int i2r_ASIdentifiers(const X509V3_EXT_METHOD *method,
 110                              void *ext, BIO *out, int indent)
 111 {
 112     ASIdentifiers *asid = ext;
 113     return (i2r_ASIdentifierChoice(out, asid->asnum, indent,
 114                                    "Autonomous System Numbers") &&
 115             i2r_ASIdentifierChoice(out, asid->rdi, indent,
 116                                    "Routing Domain Identifiers"));
 117 }
 118
 119 /*
 120  * Sort comparison function for a sequence of ASIdOrRange elements.
 121  */
 122 static int ASIdOrRange_cmp(const ASIdOrRange *const *a_,
 123                            const ASIdOrRange *const *b_)
 124 {
 125     const ASIdOrRange *a = *a_, *b = *b_;
 126
 127     assert((a->type == ASIdOrRange_id && a->u.id != NULL) ||
 128            (a->type == ASIdOrRange_range && a->u.range != NULL &&
 129             a->u.range->min != NULL && a->u.range->max != NULL));
 130
 131     assert((b->type == ASIdOrRange_id && b->u.id != NULL) ||
 132            (b->type == ASIdOrRange_range && b->u.range != NULL &&
 133             b->u.range->min != NULL && b->u.range->max != NULL));
 134
 135     if (a->type == ASIdOrRange_id && b->type == ASIdOrRange_id)
 136         return ASN1_INTEGER_cmp(a->u.id, b->u.id);
 137
 138     if (a->type == ASIdOrRange_range && b->type == ASIdOrRange_range) {
 139         int r = ASN1_INTEGER_cmp(a->u.range->min, b->u.range->min);
 140         return r != 0 ? r : ASN1_INTEGER_cmp(a->u.range->max,
 141                                              b->u.range->max);
 142     }
 143
 144     if (a->type == ASIdOrRange_id)
 145         return ASN1_INTEGER_cmp(a->u.id, b->u.range->min);
 146     else
 147         return ASN1_INTEGER_cmp(a->u.range->min, b->u.id);
 148 }
 149
 150 /*
 151  * Add an inherit element.
 152  */
 153 int X509v3_asid_add_inherit(ASIdentifiers *asid, int which)
 154 {
 155     ASIdentifierChoice **choice;
 156     if (asid == NULL)
 157         return 0;
 158     switch (which) {
 159     case V3_ASID_ASNUM:
 160         choice = &asid->asnum;
 161         break;
 162     case V3_ASID_RDI:
 163         choice = &asid->rdi;
 164         break;
 165     default:
 166         return 0;
 167     }
 168     if (*choice == NULL) {
 169         if ((*choice = ASIdentifierChoice_new()) == NULL)
 170             return 0;
 171         if (((*choice)->u.inherit = ASN1_NULL_new()) == NULL)
 172             return 0;
 173         (*choice)->type = ASIdentifierChoice_inherit;
 174     }
 175     return (*choice)->type == ASIdentifierChoice_inherit;
 176 }
 177
 178 /*
 179  * Add an ID or range to an ASIdentifierChoice.
 180  */
 181 int X509v3_asid_add_id_or_range(ASIdentifiers *asid,
 182                                 int which, ASN1_INTEGER *min, ASN1_INTEGER *max)
 183 {
 184     ASIdentifierChoice **choice;
 185     ASIdOrRange *aor;
 186     if (asid == NULL)
 187         return 0;
 188     switch (which) {
 189     case V3_ASID_ASNUM:
 190         choice = &asid->asnum;
 191         break;
 192     case V3_ASID_RDI:
 193         choice = &asid->rdi;
 194         break;
 195     default:
 196         return 0;
 197     }
 198     if (*choice != NULL && (*choice)->type == ASIdentifierChoice_inherit)
 199         return 0;
 200     if (*choice == NULL) {
 201         if ((*choice = ASIdentifierChoice_new()) == NULL)
 202             return 0;
 203         (*choice)->u.asIdsOrRanges = sk_ASIdOrRange_new(ASIdOrRange_cmp);
 204         if ((*choice)->u.asIdsOrRanges == NULL)
 205             return 0;
 206         (*choice)->type = ASIdentifierChoice_asIdsOrRanges;
 207     }
 208     if ((aor = ASIdOrRange_new()) == NULL)
 209         return 0;
 210     if (max == NULL) {
 211         aor->type = ASIdOrRange_id;
 212         aor->u.id = min;
 213     } else {
 214         aor->type = ASIdOrRange_range;
 215         if ((aor->u.range = ASRange_new()) == NULL)
 216             goto err;
 217         ASN1_INTEGER_free(aor->u.range->min);
 218         aor->u.range->min = min;
 219         ASN1_INTEGER_free(aor->u.range->max);
 220         aor->u.range->max = max;
 221     }
 222     if (!(sk_ASIdOrRange_push((*choice)->u.asIdsOrRanges, aor)))
 223         goto err;
 224     return 1;
 225
 226  err:
 227     ASIdOrRange_free(aor);
 228     return 0;
 229 }
 230
 231 /*
 232  * Extract min and max values from an ASIdOrRange.
 233  */
 234 static int extract_min_max(ASIdOrRange *aor,
 235                            ASN1_INTEGER **min, ASN1_INTEGER **max)
 236 {
 237     if (!ossl_assert(aor != NULL))
 238         return 0;
 239     switch (aor->type) {
 240     case ASIdOrRange_id:
 241         *min = aor->u.id;
 242         *max = aor->u.id;
 243         return 1;
 244     case ASIdOrRange_range:
 245         *min = aor->u.range->min;
 246         *max = aor->u.range->max;
 247         return 1;
 248     }
 249
 250     return 0;
 251 }
 252
 253 /*
 254  * Check whether an ASIdentifierChoice is in canonical form.
 255  */
 256 static int ASIdentifierChoice_is_canonical(ASIdentifierChoice *choice)
 257 {
 258     ASN1_INTEGER *a_max_plus_one = NULL;
 259     ASN1_INTEGER *orig;
 260     BIGNUM *bn = NULL;
 261     int i, ret = 0;
 262
 263     /*
 264      * Empty element or inheritance is canonical.
 265      */
 266     if (choice == NULL || choice->type == ASIdentifierChoice_inherit)
 267         return 1;
 268
 269     /*
 270      * If not a list, or if empty list, it's broken.
 271      */
 272     if (choice->type != ASIdentifierChoice_asIdsOrRanges ||
 273         sk_ASIdOrRange_num(choice->u.asIdsOrRanges) == 0)
 274         return 0;
 275
 276     /*
 277      * It's a list, check it.
 278      */
 279     for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1; i++) {
 280         ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
 281         ASIdOrRange *b = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i + 1);
 282         ASN1_INTEGER *a_min = NULL, *a_max = NULL, *b_min = NULL, *b_max =
 283             NULL;
 284
 285         if (!extract_min_max(a, &a_min, &a_max)
 286                 || !extract_min_max(b, &b_min, &b_max))
 287             goto done;
 288
 289         /*
 290          * Punt misordered list, overlapping start, or inverted range.
 291          */
 292         if (ASN1_INTEGER_cmp(a_min, b_min) >= 0 ||
 293             ASN1_INTEGER_cmp(a_min, a_max) > 0 ||
 294             ASN1_INTEGER_cmp(b_min, b_max) > 0)
 295             goto done;
 296
 297         /*
 298          * Calculate a_max + 1 to check for adjacency.
 299          */
 300         if ((bn == NULL && (bn = BN_new()) == NULL) ||
 301             ASN1_INTEGER_to_BN(a_max, bn) == NULL ||
 302             !BN_add_word(bn, 1)) {
 303             X509V3err(X509V3_F_ASIDENTIFIERCHOICE_IS_CANONICAL,
 304                       ERR_R_MALLOC_FAILURE);
 305             goto done;
 306         }
 307
 308         if ((a_max_plus_one =
 309                 BN_to_ASN1_INTEGER(bn, orig = a_max_plus_one)) == NULL) {
 310             a_max_plus_one = orig;
 311             X509V3err(X509V3_F_ASIDENTIFIERCHOICE_IS_CANONICAL,
 312                       ERR_R_MALLOC_FAILURE);
 313             goto done;
 314         }
 315
 316         /*
 317          * Punt if adjacent or overlapping.
 318          */
 319         if (ASN1_INTEGER_cmp(a_max_plus_one, b_min) >= 0)
 320             goto done;
 321     }
 322
 323     /*
 324      * Check for inverted range.
 325      */
 326     i = sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1;
 327     {
 328         ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
 329         ASN1_INTEGER *a_min, *a_max;
 330         if (a != NULL && a->type == ASIdOrRange_range) {
 331             if (!extract_min_max(a, &a_min, &a_max)
 332                     || ASN1_INTEGER_cmp(a_min, a_max) > 0)
 333                 goto done;
 334         }
 335     }
 336
 337     ret = 1;
 338
 339  done:
 340     ASN1_INTEGER_free(a_max_plus_one);
 341     BN_free(bn);
 342     return ret;
 343 }
 344
 345 /*
 346  * Check whether an ASIdentifier extension is in canonical form.
 347  */
 348 int X509v3_asid_is_canonical(ASIdentifiers *asid)
 349 {
 350     return (asid == NULL ||
 351             (ASIdentifierChoice_is_canonical(asid->asnum) &&
 352              ASIdentifierChoice_is_canonical(asid->rdi)));
 353 }
 354
 355 /*
 356  * Whack an ASIdentifierChoice into canonical form.
 357  */
 358 static int ASIdentifierChoice_canonize(ASIdentifierChoice *choice)
 359 {
 360     ASN1_INTEGER *a_max_plus_one = NULL;
 361     ASN1_INTEGER *orig;
 362     BIGNUM *bn = NULL;
 363     int i, ret = 0;
 364
 365     /*
 366      * Nothing to do for empty element or inheritance.
 367      */
 368     if (choice == NULL || choice->type == ASIdentifierChoice_inherit)
 369         return 1;
 370
 371     /*
 372      * If not a list, or if empty list, it's broken.
 373      */
 374     if (choice->type != ASIdentifierChoice_asIdsOrRanges ||
 375         sk_ASIdOrRange_num(choice->u.asIdsOrRanges) == 0) {
 376         X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
 377                   X509V3_R_EXTENSION_VALUE_ERROR);
 378         return 0;
 379     }
 380
 381     /*
 382      * We have a non-empty list.  Sort it.
 383      */
 384     sk_ASIdOrRange_sort(choice->u.asIdsOrRanges);
 385
 386     /*
 387      * Now check for errors and suboptimal encoding, rejecting the
 388      * former and fixing the latter.
 389      */
 390     for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1; i++) {
 391         ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
 392         ASIdOrRange *b = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i + 1);
 393         ASN1_INTEGER *a_min = NULL, *a_max = NULL, *b_min = NULL, *b_max =
 394             NULL;
 395
 396         if (!extract_min_max(a, &a_min, &a_max)
 397                 || !extract_min_max(b, &b_min, &b_max))
 398             goto done;
 399
 400         /*
 401          * Make sure we're properly sorted (paranoia).
 402          */
 403         if (!ossl_assert(ASN1_INTEGER_cmp(a_min, b_min) <= 0))
 404             goto done;
 405
 406         /*
 407          * Punt inverted ranges.
 408          */
 409         if (ASN1_INTEGER_cmp(a_min, a_max) > 0 ||
 410             ASN1_INTEGER_cmp(b_min, b_max) > 0)
 411             goto done;
 412
 413         /*
 414          * Check for overlaps.
 415          */
 416         if (ASN1_INTEGER_cmp(a_max, b_min) >= 0) {
 417             X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
 418                       X509V3_R_EXTENSION_VALUE_ERROR);
 419             goto done;
 420         }
 421
 422         /*
 423          * Calculate a_max + 1 to check for adjacency.
 424          */
 425         if ((bn == NULL && (bn = BN_new()) == NULL) ||
 426             ASN1_INTEGER_to_BN(a_max, bn) == NULL ||
 427             !BN_add_word(bn, 1)) {
 428             X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
 429                       ERR_R_MALLOC_FAILURE);
 430             goto done;
 431         }
 432
 433         if ((a_max_plus_one =
 434                  BN_to_ASN1_INTEGER(bn, orig = a_max_plus_one)) == NULL) {
 435             a_max_plus_one = orig;
 436             X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
 437                       ERR_R_MALLOC_FAILURE);
 438             goto done;
 439         }
 440
 441         /*
 442          * If a and b are adjacent, merge them.
 443          */
 444         if (ASN1_INTEGER_cmp(a_max_plus_one, b_min) == 0) {
 445             ASRange *r;
 446             switch (a->type) {
 447             case ASIdOrRange_id:
 448                 if ((r = OPENSSL_malloc(sizeof(*r))) == NULL) {
 449                     X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
 450                               ERR_R_MALLOC_FAILURE);
 451                     goto done;
 452                 }
 453                 r->min = a_min;
 454                 r->max = b_max;
 455                 a->type = ASIdOrRange_range;
 456                 a->u.range = r;
 457                 break;
 458             case ASIdOrRange_range:
 459                 ASN1_INTEGER_free(a->u.range->max);
 460                 a->u.range->max = b_max;
 461                 break;
 462             }
 463             switch (b->type) {
 464             case ASIdOrRange_id:
 465                 b->u.id = NULL;
 466                 break;
 467             case ASIdOrRange_range:
 468                 b->u.range->max = NULL;
 469                 break;
 470             }
 471             ASIdOrRange_free(b);
 472             (void)sk_ASIdOrRange_delete(choice->u.asIdsOrRanges, i + 1);
 473             i--;
 474             continue;
 475         }
 476     }
 477
 478     /*
 479      * Check for final inverted range.
 480      */
 481     i = sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1;
 482     {
 483         ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
 484         ASN1_INTEGER *a_min, *a_max;
 485         if (a != NULL && a->type == ASIdOrRange_range) {
 486             if (!extract_min_max(a, &a_min, &a_max)
 487                     || ASN1_INTEGER_cmp(a_min, a_max) > 0)
 488                 goto done;
 489         }
 490     }
 491
 492     /* Paranoia */
 493     if (!ossl_assert(ASIdentifierChoice_is_canonical(choice)))
 494         goto done;
 495
 496     ret = 1;
 497
 498  done:
 499     ASN1_INTEGER_free(a_max_plus_one);
 500     BN_free(bn);
 501     return ret;
 502 }
 503
 504 /*
 505  * Whack an ASIdentifier extension into canonical form.
 506  */
 507 int X509v3_asid_canonize(ASIdentifiers *asid)
 508 {
 509     return (asid == NULL ||
 510             (ASIdentifierChoice_canonize(asid->asnum) &&
 511              ASIdentifierChoice_canonize(asid->rdi)));
 512 }
 513
 514 /*
 515  * v2i method for an ASIdentifier extension.
 516  */
 517 static void *v2i_ASIdentifiers(const struct v3_ext_method *method,
 518                                struct v3_ext_ctx *ctx,
 519                                STACK_OF(CONF_VALUE) *values)
 520 {
 521     ASN1_INTEGER *min = NULL, *max = NULL;
 522     ASIdentifiers *asid = NULL;
 523     int i;
 524
 525     if ((asid = ASIdentifiers_new()) == NULL) {
 526         X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
 527         return NULL;
 528     }
 529
 530     for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
 531         CONF_VALUE *val = sk_CONF_VALUE_value(values, i);
 532         int i1 = 0, i2 = 0, i3 = 0, is_range = 0, which = 0;
 533
 534         /*
 535          * Figure out whether this is an AS or an RDI.
 536          */
 537         if (!name_cmp(val->name, "AS")) {
 538             which = V3_ASID_ASNUM;
 539         } else if (!name_cmp(val->name, "RDI")) {
 540             which = V3_ASID_RDI;
 541         } else {
 542             X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
 543                       X509V3_R_EXTENSION_NAME_ERROR);
 544             X509V3_conf_err(val);
 545             goto err;
 546         }
 547
 548         /*
 549          * Handle inheritance.
 550          */
 551         if (strcmp(val->value, "inherit") == 0) {
 552             if (X509v3_asid_add_inherit(asid, which))
 553                 continue;
 554             X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
 555                       X509V3_R_INVALID_INHERITANCE);
 556             X509V3_conf_err(val);
 557             goto err;
 558         }
 559
 560         /*
 561          * Number, range, or mistake, pick it apart and figure out which.
 562          */
 563         i1 = strspn(val->value, "0123456789");
 564         if (val->value[i1] == '\0') {
 565             is_range = 0;
 566         } else {
 567             is_range = 1;
 568             i2 = i1 + strspn(val->value + i1, " \t");
 569             if (val->value[i2] != '-') {
 570                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
 571                           X509V3_R_INVALID_ASNUMBER);
 572                 X509V3_conf_err(val);
 573                 goto err;
 574             }
 575             i2++;
 576             i2 = i2 + strspn(val->value + i2, " \t");
 577             i3 = i2 + strspn(val->value + i2, "0123456789");
 578             if (val->value[i3] != '\0') {
 579                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
 580                           X509V3_R_INVALID_ASRANGE);
 581                 X509V3_conf_err(val);
 582                 goto err;
 583             }
 584         }
 585
 586         /*
 587          * Syntax is ok, read and add it.
 588          */
 589         if (!is_range) {
 590             if (!X509V3_get_value_int(val, &min)) {
 591                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
 592                 goto err;
 593             }
 594         } else {
 595             char *s = OPENSSL_strdup(val->value);
 596             if (s == NULL) {
 597                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
 598                 goto err;
 599             }
 600             s[i1] = '\0';
 601             min = s2i_ASN1_INTEGER(NULL, s);
 602             max = s2i_ASN1_INTEGER(NULL, s + i2);
 603             OPENSSL_free(s);
 604             if (min == NULL || max == NULL) {
 605                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
 606                 goto err;
 607             }
 608             if (ASN1_INTEGER_cmp(min, max) > 0) {
 609                 X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
 610                           X509V3_R_EXTENSION_VALUE_ERROR);
 611                 goto err;
 612             }
 613         }
 614         if (!X509v3_asid_add_id_or_range(asid, which, min, max)) {
 615             X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
 616             goto err;
 617         }
 618         min = max = NULL;
 619     }
 620
 621     /*
 622      * Canonize the result, then we're done.
 623      */
 624     if (!X509v3_asid_canonize(asid))
 625         goto err;
 626     return asid;
 627
 628  err:
 629     ASIdentifiers_free(asid);
 630     ASN1_INTEGER_free(min);
 631     ASN1_INTEGER_free(max);
 632     return NULL;
 633 }
 634
 635 /*
 636  * OpenSSL dispatch.
 637  */
 638 const X509V3_EXT_METHOD v3_asid = {
 639     NID_sbgp_autonomousSysNum,  /* nid */
 640     0,                          /* flags */
 641     ASN1_ITEM_ref(ASIdentifiers), /* template */
 642     0, 0, 0, 0,                 /* old functions, ignored */
 643     0,                          /* i2s */
 644     0,                          /* s2i */
 645     0,                          /* i2v */
 646     v2i_ASIdentifiers,          /* v2i */
 647     i2r_ASIdentifiers,          /* i2r */
 648     0,                          /* r2i */
 649     NULL                        /* extension-specific data */
 650 };
 651
 652 /*
 653  * Figure out whether extension uses inheritance.
 654  */
 655 int X509v3_asid_inherits(ASIdentifiers *asid)
 656 {
 657     return (asid != NULL &&
 658             ((asid->asnum != NULL &&
 659               asid->asnum->type == ASIdentifierChoice_inherit) ||
 660              (asid->rdi != NULL &&
 661               asid->rdi->type == ASIdentifierChoice_inherit)));
 662 }
 663
 664 /*
 665  * Figure out whether parent contains child.
 666  */
 667 static int asid_contains(ASIdOrRanges *parent, ASIdOrRanges *child)
 668 {
 669     ASN1_INTEGER *p_min = NULL, *p_max = NULL, *c_min = NULL, *c_max = NULL;
 670     int p, c;
 671
 672     if (child == NULL || parent == child)
 673         return 1;
 674     if (parent == NULL)
 675         return 0;
 676
 677     p = 0;
 678     for (c = 0; c < sk_ASIdOrRange_num(child); c++) {
 679         if (!extract_min_max(sk_ASIdOrRange_value(child, c), &c_min, &c_max))
 680             return 0;
 681         for (;; p++) {
 682             if (p >= sk_ASIdOrRange_num(parent))
 683                 return 0;
 684             if (!extract_min_max(sk_ASIdOrRange_value(parent, p), &p_min,
 685                                  &p_max))
 686                 return 0;
 687             if (ASN1_INTEGER_cmp(p_max, c_max) < 0)
 688                 continue;
 689             if (ASN1_INTEGER_cmp(p_min, c_min) > 0)
 690                 return 0;
 691             break;
 692         }
 693     }
 694
 695     return 1;
 696 }
 697
 698 /*
 699  * Test whether a is a subset of b.
 700  */
 701 int X509v3_asid_subset(ASIdentifiers *a, ASIdentifiers *b)
 702 {
 703     return (a == NULL ||
 704             a == b ||
 705             (b != NULL &&
 706              !X509v3_asid_inherits(a) &&
 707              !X509v3_asid_inherits(b) &&
 708              asid_contains(b->asnum->u.asIdsOrRanges,
 709                            a->asnum->u.asIdsOrRanges) &&
 710              asid_contains(b->rdi->u.asIdsOrRanges,
 711                            a->rdi->u.asIdsOrRanges)));
 712 }
 713
 714 /*
 715  * Validation error handling via callback.
 716  */
 717 #define validation_err(_err_)           \
 718   do {                                  \
 719     if (ctx != NULL) {                  \
 720       ctx->error = _err_;               \
 721       ctx->error_depth = i;             \
 722       ctx->current_cert = x;            \
 723       ret = ctx->verify_cb(0, ctx);     \
 724     } else {                            \
 725       ret = 0;                          \
 726     }                                   \
 727     if (!ret)                           \
 728       goto done;                        \
 729   } while (0)
 730
 731 /*
 732  * Core code for RFC 3779 3.3 path validation.
 733  */
 734 static int asid_validate_path_internal(X509_STORE_CTX *ctx,
 735                                        STACK_OF(X509) *chain,
 736                                        ASIdentifiers *ext)
 737 {
 738     ASIdOrRanges *child_as = NULL, *child_rdi = NULL;
 739     int i, ret = 1, inherit_as = 0, inherit_rdi = 0;
 740     X509 *x;
 741
 742     if (!ossl_assert(chain != NULL && sk_X509_num(chain) > 0)
 743             || !ossl_assert(ctx != NULL || ext != NULL)
 744             || !ossl_assert(ctx == NULL || ctx->verify_cb != NULL)) {
 745         if (ctx != NULL)
 746             ctx->error = X509_V_ERR_UNSPECIFIED;
 747         return 0;
 748     }
 749
 750
 751     /*
 752      * Figure out where to start.  If we don't have an extension to
 753      * check, we're done.  Otherwise, check canonical form and
 754      * set up for walking up the chain.
 755      */
 756     if (ext != NULL) {
 757         i = -1;
 758         x = NULL;
 759     } else {
 760         i = 0;
 761         x = sk_X509_value(chain, i);
 762         if ((ext = x->rfc3779_asid) == NULL)
 763             goto done;
 764     }
 765     if (!X509v3_asid_is_canonical(ext))
 766         validation_err(X509_V_ERR_INVALID_EXTENSION);
 767     if (ext->asnum != NULL) {
 768         switch (ext->asnum->type) {
 769         case ASIdentifierChoice_inherit:
 770             inherit_as = 1;
 771             break;
 772         case ASIdentifierChoice_asIdsOrRanges:
 773             child_as = ext->asnum->u.asIdsOrRanges;
 774             break;
 775         }
 776     }
 777     if (ext->rdi != NULL) {
 778         switch (ext->rdi->type) {
 779         case ASIdentifierChoice_inherit:
 780             inherit_rdi = 1;
 781             break;
 782         case ASIdentifierChoice_asIdsOrRanges:
 783             child_rdi = ext->rdi->u.asIdsOrRanges;
 784             break;
 785         }
 786     }
 787
 788     /*
 789      * Now walk up the chain.  Extensions must be in canonical form, no
 790      * cert may list resources that its parent doesn't list.
 791      */
 792     for (i++; i < sk_X509_num(chain); i++) {
 793         x = sk_X509_value(chain, i);
 794         if (!ossl_assert(x != NULL)) {
 795             if (ctx != NULL)
 796                 ctx->error = X509_V_ERR_UNSPECIFIED;
 797             return 0;
 798         }
 799         if (x->rfc3779_asid == NULL) {
 800             if (child_as != NULL || child_rdi != NULL)
 801                 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 802             continue;
 803         }
 804         if (!X509v3_asid_is_canonical(x->rfc3779_asid))
 805             validation_err(X509_V_ERR_INVALID_EXTENSION);
 806         if (x->rfc3779_asid->asnum == NULL && child_as != NULL) {
 807             validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 808             child_as = NULL;
 809             inherit_as = 0;
 810         }
 811         if (x->rfc3779_asid->asnum != NULL &&
 812             x->rfc3779_asid->asnum->type ==
 813             ASIdentifierChoice_asIdsOrRanges) {
 814             if (inherit_as
 815                 || asid_contains(x->rfc3779_asid->asnum->u.asIdsOrRanges,
 816                                  child_as)) {
 817                 child_as = x->rfc3779_asid->asnum->u.asIdsOrRanges;
 818                 inherit_as = 0;
 819             } else {
 820                 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 821             }
 822         }
 823         if (x->rfc3779_asid->rdi == NULL && child_rdi != NULL) {
 824             validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 825             child_rdi = NULL;
 826             inherit_rdi = 0;
 827         }
 828         if (x->rfc3779_asid->rdi != NULL &&
 829             x->rfc3779_asid->rdi->type == ASIdentifierChoice_asIdsOrRanges) {
 830             if (inherit_rdi ||
 831                 asid_contains(x->rfc3779_asid->rdi->u.asIdsOrRanges,
 832                               child_rdi)) {
 833                 child_rdi = x->rfc3779_asid->rdi->u.asIdsOrRanges;
 834                 inherit_rdi = 0;
 835             } else {
 836                 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 837             }
 838         }
 839     }
 840
 841     /*
 842      * Trust anchor can't inherit.
 843      */
 844     if (!ossl_assert(x != NULL)) {
 845         if (ctx != NULL)
 846             ctx->error = X509_V_ERR_UNSPECIFIED;
 847         return 0;
 848     }
 849     if (x->rfc3779_asid != NULL) {
 850         if (x->rfc3779_asid->asnum != NULL &&
 851             x->rfc3779_asid->asnum->type == ASIdentifierChoice_inherit)
 852             validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 853         if (x->rfc3779_asid->rdi != NULL &&
 854             x->rfc3779_asid->rdi->type == ASIdentifierChoice_inherit)
 855             validation_err(X509_V_ERR_UNNESTED_RESOURCE);
 856     }
 857
 858  done:
 859     return ret;
 860 }
 861
 862 #undef validation_err
 863
 864 /*
 865  * RFC 3779 3.3 path validation -- called from X509_verify_cert().
 866  */
 867 int X509v3_asid_validate_path(X509_STORE_CTX *ctx)
 868 {
 869     if (ctx->chain == NULL
 870             || sk_X509_num(ctx->chain) == 0
 871             || ctx->verify_cb == NULL) {
 872         ctx->error = X509_V_ERR_UNSPECIFIED;
 873         return 0;
 874     }
 875     return asid_validate_path_internal(ctx, ctx->chain, NULL);
 876 }
 877
 878 /*
 879  * RFC 3779 3.3 path validation of an extension.
 880  * Test whether chain covers extension.
 881  */
 882 int X509v3_asid_validate_resource_set(STACK_OF(X509) *chain,
 883                                       ASIdentifiers *ext, int allow_inheritance)
 884 {
 885     if (ext == NULL)
 886         return 1;
 887     if (chain == NULL || sk_X509_num(chain) == 0)
 888         return 0;
 889     if (!allow_inheritance && X509v3_asid_inherits(ext))
 890         return 0;
 891     return asid_validate_path_internal(NULL, chain, ext);
 892 }
 893
 894 #endif                          /* OPENSSL_NO_RFC3779 */