crypto/x509v3/v3_addr.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 2.2.
  60  */
  61
  62 #include <stdio.h>
  63 #include <stdlib.h>
  64
  65 #include "cryptlib.h"
  66 #include <openssl/conf.h>
  67 #include <openssl/asn1.h>
  68 #include <openssl/asn1t.h>
  69 #include <openssl/buffer.h>
  70 #include <openssl/x509v3.h>
  71
  72
  73 /*
  74  * OpenSSL ASN.1 template translation of RFC 3779 2.2.3.
  75  */
  76
  77 ASN1_SEQUENCE(IPAddressRange) = {
  78   ASN1_SIMPLE(IPAddressRange, min, ASN1_BIT_STRING),
  79   ASN1_SIMPLE(IPAddressRange, max, ASN1_BIT_STRING)
  80 } ASN1_SEQUENCE_END(IPAddressRange)
  81
  82 ASN1_CHOICE(IPAddressOrRange) = {
  83   ASN1_SIMPLE(IPAddressOrRange, u.addressPrefix, ASN1_BIT_STRING),
  84   ASN1_SIMPLE(IPAddressOrRange, u.addressRange,  IPAddressRange)
  85 } ASN1_CHOICE_END(IPAddressOrRange)
  86
  87 ASN1_CHOICE(IPAddressChoice) = {
  88   ASN1_SIMPLE(IPAddressChoice,      u.inherit,           ASN1_NULL),
  89   ASN1_SEQUENCE_OF(IPAddressChoice, u.addressesOrRanges, IPAddressOrRange)
  90 } ASN1_CHOICE_END(IPAddressChoice)
  91
  92 ASN1_SEQUENCE(IPAddressFamily) = {
  93   ASN1_SIMPLE(IPAddressFamily, addressFamily,   ASN1_OCTET_STRING),
  94   ASN1_SIMPLE(IPAddressFamily, ipAddressChoice, IPAddressChoice)
  95 } ASN1_SEQUENCE_END(IPAddressFamily)
  96
  97 ASN1_ITEM_TEMPLATE(IPAddrBlocks) =
  98   ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0,
  99                         IPAddrBlocks, IPAddressFamily)
 100 ASN1_ITEM_TEMPLATE_END(IPAddrBlocks)
 101
 102 IMPLEMENT_ASN1_FUNCTIONS(IPAddressRange)
 103 IMPLEMENT_ASN1_FUNCTIONS(IPAddressOrRange)
 104 IMPLEMENT_ASN1_FUNCTIONS(IPAddressChoice)
 105 IMPLEMENT_ASN1_FUNCTIONS(IPAddressFamily)
 106
 107 /*
 108  * How much buffer space do we need for a raw address?
 109  */
 110 #define ADDR_RAW_BUF_LEN        16
 111
 112 /*
 113  * What's the address length associated with this AFI?
 114  */
 115 static int length_from_afi(const unsigned afi)
 116 {
 117     switch (afi) {
 118     case IANA_AFI_IPV4:
 119         return 4;
 120     case IANA_AFI_IPV6:
 121         return 16;
 122     default:
 123         return 0;
 124     }
 125 }
 126
 127 /*
 128  * Extract the AFI from an IPAddressFamily.
 129  */
 130 unsigned int v3_addr_get_afi(const IPAddressFamily *f)
 131 {
 132     return ((f != NULL &&
 133              f->addressFamily != NULL && f->addressFamily->data != NULL)
 134             ? ((f->addressFamily->data[0] << 8) | (f->addressFamily->data[1]))
 135             : 0);
 136 }
 137
 138 /*
 139  * Expand the bitstring form of an address into a raw byte array.
 140  * At the moment this is coded for simplicity, not speed.
 141  */
 142 static int addr_expand(unsigned char *addr,
 143                        const ASN1_BIT_STRING *bs,
 144                        const int length, const unsigned char fill)
 145 {
 146     if (bs->length < 0 || bs->length > length)
 147         return 0;
 148     if (bs->length > 0) {
 149         memcpy(addr, bs->data, bs->length);
 150         if ((bs->flags & 7) != 0) {
 151             unsigned char mask = 0xFF >> (8 - (bs->flags & 7));
 152             if (fill == 0)
 153                 addr[bs->length - 1] &= ~mask;
 154             else
 155                 addr[bs->length - 1] |= mask;
 156         }
 157     }
 158     memset(addr + bs->length, fill, length - bs->length);
 159     return 1;
 160 }
 161
 162 /*
 163  * Extract the prefix length from a bitstring.
 164  */
 165 #define addr_prefixlen(bs) ((int) ((bs)->length * 8 - ((bs)->flags & 7)))
 166
 167 /*
 168  * i2r handler for one address bitstring.
 169  */
 170 static int i2r_address(BIO *out,
 171                        const unsigned afi,
 172                        const unsigned char fill, const ASN1_BIT_STRING *bs)
 173 {
 174     unsigned char addr[ADDR_RAW_BUF_LEN];
 175     int i, n;
 176
 177     if (bs->length < 0)
 178         return 0;
 179     switch (afi) {
 180     case IANA_AFI_IPV4:
 181         if (!addr_expand(addr, bs, 4, fill))
 182             return 0;
 183         BIO_printf(out, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
 184         break;
 185     case IANA_AFI_IPV6:
 186         if (!addr_expand(addr, bs, 16, fill))
 187             return 0;
 188         for (n = 16; n > 1 && addr[n - 1] == 0x00 && addr[n - 2] == 0x00;
 189              n -= 2) ;
 190         for (i = 0; i < n; i += 2)
 191             BIO_printf(out, "%x%s", (addr[i] << 8) | addr[i + 1],
 192                        (i < 14 ? ":" : ""));
 193         if (i < 16)
 194             BIO_puts(out, ":");
 195         if (i == 0)
 196             BIO_puts(out, ":");
 197         break;
 198     default:
 199         for (i = 0; i < bs->length; i++)
 200             BIO_printf(out, "%s%02x", (i > 0 ? ":" : ""), bs->data[i]);
 201         BIO_printf(out, "[%d]", (int)(bs->flags & 7));
 202         break;
 203     }
 204     return 1;
 205 }
 206
 207 /*
 208  * i2r handler for a sequence of addresses and ranges.
 209  */
 210 static int i2r_IPAddressOrRanges(BIO *out,
 211                                  const int indent,
 212                                  const IPAddressOrRanges *aors,
 213                                  const unsigned afi)
 214 {
 215     int i;
 216     for (i = 0; i < sk_IPAddressOrRange_num(aors); i++) {
 217         const IPAddressOrRange *aor = sk_IPAddressOrRange_value(aors, i);
 218         BIO_printf(out, "%*s", indent, "");
 219         switch (aor->type) {
 220         case IPAddressOrRange_addressPrefix:
 221             if (!i2r_address(out, afi, 0x00, aor->u.addressPrefix))
 222                 return 0;
 223             BIO_printf(out, "/%d\n", addr_prefixlen(aor->u.addressPrefix));
 224             continue;
 225         case IPAddressOrRange_addressRange:
 226             if (!i2r_address(out, afi, 0x00, aor->u.addressRange->min))
 227                 return 0;
 228             BIO_puts(out, "-");
 229             if (!i2r_address(out, afi, 0xFF, aor->u.addressRange->max))
 230                 return 0;
 231             BIO_puts(out, "\n");
 232             continue;
 233         }
 234     }
 235     return 1;
 236 }
 237
 238 /*
 239  * i2r handler for an IPAddrBlocks extension.
 240  */
 241 static int i2r_IPAddrBlocks(const X509V3_EXT_METHOD *method,
 242                             void *ext, BIO *out, int indent)
 243 {
 244     const IPAddrBlocks *addr = ext;
 245     int i;
 246     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 247         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
 248         const unsigned int afi = v3_addr_get_afi(f);
 249         switch (afi) {
 250         case IANA_AFI_IPV4:
 251             BIO_printf(out, "%*sIPv4", indent, "");
 252             break;
 253         case IANA_AFI_IPV6:
 254             BIO_printf(out, "%*sIPv6", indent, "");
 255             break;
 256         default:
 257             BIO_printf(out, "%*sUnknown AFI %u", indent, "", afi);
 258             break;
 259         }
 260         if (f->addressFamily->length > 2) {
 261             switch (f->addressFamily->data[2]) {
 262             case 1:
 263                 BIO_puts(out, " (Unicast)");
 264                 break;
 265             case 2:
 266                 BIO_puts(out, " (Multicast)");
 267                 break;
 268             case 3:
 269                 BIO_puts(out, " (Unicast/Multicast)");
 270                 break;
 271             case 4:
 272                 BIO_puts(out, " (MPLS)");
 273                 break;
 274             case 64:
 275                 BIO_puts(out, " (Tunnel)");
 276                 break;
 277             case 65:
 278                 BIO_puts(out, " (VPLS)");
 279                 break;
 280             case 66:
 281                 BIO_puts(out, " (BGP MDT)");
 282                 break;
 283             case 128:
 284                 BIO_puts(out, " (MPLS-labeled VPN)");
 285                 break;
 286             default:
 287                 BIO_printf(out, " (Unknown SAFI %u)",
 288                            (unsigned)f->addressFamily->data[2]);
 289                 break;
 290             }
 291         }
 292         switch (f->ipAddressChoice->type) {
 293         case IPAddressChoice_inherit:
 294             BIO_puts(out, ": inherit\n");
 295             break;
 296         case IPAddressChoice_addressesOrRanges:
 297             BIO_puts(out, ":\n");
 298             if (!i2r_IPAddressOrRanges(out,
 299                                        indent + 2,
 300                                        f->ipAddressChoice->
 301                                        u.addressesOrRanges, afi))
 302                 return 0;
 303             break;
 304         }
 305     }
 306     return 1;
 307 }
 308
 309 /*
 310  * Sort comparison function for a sequence of IPAddressOrRange
 311  * elements.
 312  *
 313  * There's no sane answer we can give if addr_expand() fails, and an
 314  * assertion failure on externally supplied data is seriously uncool,
 315  * so we just arbitrarily declare that if given invalid inputs this
 316  * function returns -1.  If this messes up your preferred sort order
 317  * for garbage input, tough noogies.
 318  */
 319 static int IPAddressOrRange_cmp(const IPAddressOrRange *a,
 320                                 const IPAddressOrRange *b, const int length)
 321 {
 322     unsigned char addr_a[ADDR_RAW_BUF_LEN], addr_b[ADDR_RAW_BUF_LEN];
 323     int prefixlen_a = 0, prefixlen_b = 0;
 324     int r;
 325
 326     switch (a->type) {
 327     case IPAddressOrRange_addressPrefix:
 328         if (!addr_expand(addr_a, a->u.addressPrefix, length, 0x00))
 329             return -1;
 330         prefixlen_a = addr_prefixlen(a->u.addressPrefix);
 331         break;
 332     case IPAddressOrRange_addressRange:
 333         if (!addr_expand(addr_a, a->u.addressRange->min, length, 0x00))
 334             return -1;
 335         prefixlen_a = length * 8;
 336         break;
 337     }
 338
 339     switch (b->type) {
 340     case IPAddressOrRange_addressPrefix:
 341         if (!addr_expand(addr_b, b->u.addressPrefix, length, 0x00))
 342             return -1;
 343         prefixlen_b = addr_prefixlen(b->u.addressPrefix);
 344         break;
 345     case IPAddressOrRange_addressRange:
 346         if (!addr_expand(addr_b, b->u.addressRange->min, length, 0x00))
 347             return -1;
 348         prefixlen_b = length * 8;
 349         break;
 350     }
 351
 352     if ((r = memcmp(addr_a, addr_b, length)) != 0)
 353         return r;
 354     else
 355         return prefixlen_a - prefixlen_b;
 356 }
 357
 358 /*
 359  * IPv4-specific closure over IPAddressOrRange_cmp, since sk_sort()
 360  * comparision routines are only allowed two arguments.
 361  */
 362 static int v4IPAddressOrRange_cmp(const IPAddressOrRange *const *a,
 363                                   const IPAddressOrRange *const *b)
 364 {
 365     return IPAddressOrRange_cmp(*a, *b, 4);
 366 }
 367
 368 /*
 369  * IPv6-specific closure over IPAddressOrRange_cmp, since sk_sort()
 370  * comparision routines are only allowed two arguments.
 371  */
 372 static int v6IPAddressOrRange_cmp(const IPAddressOrRange *const *a,
 373                                   const IPAddressOrRange *const *b)
 374 {
 375     return IPAddressOrRange_cmp(*a, *b, 16);
 376 }
 377
 378 /*
 379  * Calculate whether a range collapses to a prefix.
 380  * See last paragraph of RFC 3779 2.2.3.7.
 381  */
 382 static int range_should_be_prefix(const unsigned char *min,
 383                                   const unsigned char *max, const int length)
 384 {
 385     unsigned char mask;
 386     int i, j;
 387
 388     OPENSSL_assert(memcmp(min, max, length) <= 0);
 389     for (i = 0; i < length && min[i] == max[i]; i++) ;
 390     for (j = length - 1; j >= 0 && min[j] == 0x00 && max[j] == 0xFF; j--) ;
 391     if (i < j)
 392         return -1;
 393     if (i > j)
 394         return i * 8;
 395     mask = min[i] ^ max[i];
 396     switch (mask) {
 397     case 0x01:
 398         j = 7;
 399         break;
 400     case 0x03:
 401         j = 6;
 402         break;
 403     case 0x07:
 404         j = 5;
 405         break;
 406     case 0x0F:
 407         j = 4;
 408         break;
 409     case 0x1F:
 410         j = 3;
 411         break;
 412     case 0x3F:
 413         j = 2;
 414         break;
 415     case 0x7F:
 416         j = 1;
 417         break;
 418     default:
 419         return -1;
 420     }
 421     if ((min[i] & mask) != 0 || (max[i] & mask) != mask)
 422         return -1;
 423     else
 424         return i * 8 + j;
 425 }
 426
 427 /*
 428  * Construct a prefix.
 429  */
 430 static int make_addressPrefix(IPAddressOrRange **result,
 431                               unsigned char *addr, const int prefixlen)
 432 {
 433     int bytelen = (prefixlen + 7) / 8, bitlen = prefixlen % 8;
 434     IPAddressOrRange *aor = IPAddressOrRange_new();
 435
 436     if (aor == NULL)
 437         return 0;
 438     aor->type = IPAddressOrRange_addressPrefix;
 439     if (aor->u.addressPrefix == NULL &&
 440         (aor->u.addressPrefix = ASN1_BIT_STRING_new()) == NULL)
 441         goto err;
 442     if (!ASN1_BIT_STRING_set(aor->u.addressPrefix, addr, bytelen))
 443         goto err;
 444     aor->u.addressPrefix->flags &= ~7;
 445     aor->u.addressPrefix->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 446     if (bitlen > 0) {
 447         aor->u.addressPrefix->data[bytelen - 1] &= ~(0xFF >> bitlen);
 448         aor->u.addressPrefix->flags |= 8 - bitlen;
 449     }
 450
 451     *result = aor;
 452     return 1;
 453
 454  err:
 455     IPAddressOrRange_free(aor);
 456     return 0;
 457 }
 458
 459 /*
 460  * Construct a range.  If it can be expressed as a prefix,
 461  * return a prefix instead.  Doing this here simplifies
 462  * the rest of the code considerably.
 463  */
 464 static int make_addressRange(IPAddressOrRange **result,
 465                              unsigned char *min,
 466                              unsigned char *max, const int length)
 467 {
 468     IPAddressOrRange *aor;
 469     int i, prefixlen;
 470
 471     if ((prefixlen = range_should_be_prefix(min, max, length)) >= 0)
 472         return make_addressPrefix(result, min, prefixlen);
 473
 474     if ((aor = IPAddressOrRange_new()) == NULL)
 475         return 0;
 476     aor->type = IPAddressOrRange_addressRange;
 477     OPENSSL_assert(aor->u.addressRange == NULL);
 478     if ((aor->u.addressRange = IPAddressRange_new()) == NULL)
 479         goto err;
 480     if (aor->u.addressRange->min == NULL &&
 481         (aor->u.addressRange->min = ASN1_BIT_STRING_new()) == NULL)
 482         goto err;
 483     if (aor->u.addressRange->max == NULL &&
 484         (aor->u.addressRange->max = ASN1_BIT_STRING_new()) == NULL)
 485         goto err;
 486
 487     for (i = length; i > 0 && min[i - 1] == 0x00; --i) ;
 488     if (!ASN1_BIT_STRING_set(aor->u.addressRange->min, min, i))
 489         goto err;
 490     aor->u.addressRange->min->flags &= ~7;
 491     aor->u.addressRange->min->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 492     if (i > 0) {
 493         unsigned char b = min[i - 1];
 494         int j = 1;
 495         while ((b & (0xFFU >> j)) != 0)
 496             ++j;
 497         aor->u.addressRange->min->flags |= 8 - j;
 498     }
 499
 500     for (i = length; i > 0 && max[i - 1] == 0xFF; --i) ;
 501     if (!ASN1_BIT_STRING_set(aor->u.addressRange->max, max, i))
 502         goto err;
 503     aor->u.addressRange->max->flags &= ~7;
 504     aor->u.addressRange->max->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 505     if (i > 0) {
 506         unsigned char b = max[i - 1];
 507         int j = 1;
 508         while ((b & (0xFFU >> j)) != (0xFFU >> j))
 509             ++j;
 510         aor->u.addressRange->max->flags |= 8 - j;
 511     }
 512
 513     *result = aor;
 514     return 1;
 515
 516  err:
 517     IPAddressOrRange_free(aor);
 518     return 0;
 519 }
 520
 521 /*
 522  * Construct a new address family or find an existing one.
 523  */
 524 static IPAddressFamily *make_IPAddressFamily(IPAddrBlocks *addr,
 525                                              const unsigned afi,
 526                                              const unsigned *safi)
 527 {
 528     IPAddressFamily *f;
 529     unsigned char key[3];
 530     int keylen;
 531     int i;
 532
 533     key[0] = (afi >> 8) & 0xFF;
 534     key[1] = afi & 0xFF;
 535     if (safi != NULL) {
 536         key[2] = *safi & 0xFF;
 537         keylen = 3;
 538     } else {
 539         keylen = 2;
 540     }
 541
 542     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 543         f = sk_IPAddressFamily_value(addr, i);
 544         OPENSSL_assert(f->addressFamily->data != NULL);
 545         if (f->addressFamily->length == keylen &&
 546             !memcmp(f->addressFamily->data, key, keylen))
 547             return f;
 548     }
 549
 550     if ((f = IPAddressFamily_new()) == NULL)
 551         goto err;
 552     if (f->ipAddressChoice == NULL &&
 553         (f->ipAddressChoice = IPAddressChoice_new()) == NULL)
 554         goto err;
 555     if (f->addressFamily == NULL &&
 556         (f->addressFamily = ASN1_OCTET_STRING_new()) == NULL)
 557         goto err;
 558     if (!ASN1_OCTET_STRING_set(f->addressFamily, key, keylen))
 559         goto err;
 560     if (!sk_IPAddressFamily_push(addr, f))
 561         goto err;
 562
 563     return f;
 564
 565  err:
 566     IPAddressFamily_free(f);
 567     return NULL;
 568 }
 569
 570 /*
 571  * Add an inheritance element.
 572  */
 573 int v3_addr_add_inherit(IPAddrBlocks *addr,
 574                         const unsigned afi, const unsigned *safi)
 575 {
 576     IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
 577     if (f == NULL ||
 578         f->ipAddressChoice == NULL ||
 579         (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
 580          f->ipAddressChoice->u.addressesOrRanges != NULL))
 581         return 0;
 582     if (f->ipAddressChoice->type == IPAddressChoice_inherit &&
 583         f->ipAddressChoice->u.inherit != NULL)
 584         return 1;
 585     if (f->ipAddressChoice->u.inherit == NULL &&
 586         (f->ipAddressChoice->u.inherit = ASN1_NULL_new()) == NULL)
 587         return 0;
 588     f->ipAddressChoice->type = IPAddressChoice_inherit;
 589     return 1;
 590 }
 591
 592 /*
 593  * Construct an IPAddressOrRange sequence, or return an existing one.
 594  */
 595 static IPAddressOrRanges *make_prefix_or_range(IPAddrBlocks *addr,
 596                                                const unsigned afi,
 597                                                const unsigned *safi)
 598 {
 599     IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
 600     IPAddressOrRanges *aors = NULL;
 601
 602     if (f == NULL ||
 603         f->ipAddressChoice == NULL ||
 604         (f->ipAddressChoice->type == IPAddressChoice_inherit &&
 605          f->ipAddressChoice->u.inherit != NULL))
 606         return NULL;
 607     if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges)
 608         aors = f->ipAddressChoice->u.addressesOrRanges;
 609     if (aors != NULL)
 610         return aors;
 611     if ((aors = sk_IPAddressOrRange_new_null()) == NULL)
 612         return NULL;
 613     switch (afi) {
 614     case IANA_AFI_IPV4:
 615         (void)sk_IPAddressOrRange_set_cmp_func(aors, v4IPAddressOrRange_cmp);
 616         break;
 617     case IANA_AFI_IPV6:
 618         (void)sk_IPAddressOrRange_set_cmp_func(aors, v6IPAddressOrRange_cmp);
 619         break;
 620     }
 621     f->ipAddressChoice->type = IPAddressChoice_addressesOrRanges;
 622     f->ipAddressChoice->u.addressesOrRanges = aors;
 623     return aors;
 624 }
 625
 626 /*
 627  * Add a prefix.
 628  */
 629 int v3_addr_add_prefix(IPAddrBlocks *addr,
 630                        const unsigned afi,
 631                        const unsigned *safi,
 632                        unsigned char *a, const int prefixlen)
 633 {
 634     IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
 635     IPAddressOrRange *aor;
 636     if (aors == NULL || !make_addressPrefix(&aor, a, prefixlen))
 637         return 0;
 638     if (sk_IPAddressOrRange_push(aors, aor))
 639         return 1;
 640     IPAddressOrRange_free(aor);
 641     return 0;
 642 }
 643
 644 /*
 645  * Add a range.
 646  */
 647 int v3_addr_add_range(IPAddrBlocks *addr,
 648                       const unsigned afi,
 649                       const unsigned *safi,
 650                       unsigned char *min, unsigned char *max)
 651 {
 652     IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
 653     IPAddressOrRange *aor;
 654     int length = length_from_afi(afi);
 655     if (aors == NULL)
 656         return 0;
 657     if (!make_addressRange(&aor, min, max, length))
 658         return 0;
 659     if (sk_IPAddressOrRange_push(aors, aor))
 660         return 1;
 661     IPAddressOrRange_free(aor);
 662     return 0;
 663 }
 664
 665 /*
 666  * Extract min and max values from an IPAddressOrRange.
 667  */
 668 static int extract_min_max(IPAddressOrRange *aor,
 669                            unsigned char *min, unsigned char *max, int length)
 670 {
 671     if (aor == NULL || min == NULL || max == NULL)
 672         return 0;
 673     switch (aor->type) {
 674     case IPAddressOrRange_addressPrefix:
 675         return (addr_expand(min, aor->u.addressPrefix, length, 0x00) &&
 676                 addr_expand(max, aor->u.addressPrefix, length, 0xFF));
 677     case IPAddressOrRange_addressRange:
 678         return (addr_expand(min, aor->u.addressRange->min, length, 0x00) &&
 679                 addr_expand(max, aor->u.addressRange->max, length, 0xFF));
 680     }
 681     return 0;
 682 }
 683
 684 /*
 685  * Public wrapper for extract_min_max().
 686  */
 687 int v3_addr_get_range(IPAddressOrRange *aor,
 688                       const unsigned afi,
 689                       unsigned char *min,
 690                       unsigned char *max, const int length)
 691 {
 692     int afi_length = length_from_afi(afi);
 693     if (aor == NULL || min == NULL || max == NULL ||
 694         afi_length == 0 || length < afi_length ||
 695         (aor->type != IPAddressOrRange_addressPrefix &&
 696          aor->type != IPAddressOrRange_addressRange) ||
 697         !extract_min_max(aor, min, max, afi_length))
 698         return 0;
 699
 700     return afi_length;
 701 }
 702
 703 /*
 704  * Sort comparision function for a sequence of IPAddressFamily.
 705  *
 706  * The last paragraph of RFC 3779 2.2.3.3 is slightly ambiguous about
 707  * the ordering: I can read it as meaning that IPv6 without a SAFI
 708  * comes before IPv4 with a SAFI, which seems pretty weird.  The
 709  * examples in appendix B suggest that the author intended the
 710  * null-SAFI rule to apply only within a single AFI, which is what I
 711  * would have expected and is what the following code implements.
 712  */
 713 static int IPAddressFamily_cmp(const IPAddressFamily *const *a_,
 714                                const IPAddressFamily *const *b_)
 715 {
 716     const ASN1_OCTET_STRING *a = (*a_)->addressFamily;
 717     const ASN1_OCTET_STRING *b = (*b_)->addressFamily;
 718     int len = ((a->length <= b->length) ? a->length : b->length);
 719     int cmp = memcmp(a->data, b->data, len);
 720     return cmp ? cmp : a->length - b->length;
 721 }
 722
 723 /*
 724  * Check whether an IPAddrBLocks is in canonical form.
 725  */
 726 int v3_addr_is_canonical(IPAddrBlocks *addr)
 727 {
 728     unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
 729     unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
 730     IPAddressOrRanges *aors;
 731     int i, j, k;
 732
 733     /*
 734      * Empty extension is cannonical.
 735      */
 736     if (addr == NULL)
 737         return 1;
 738
 739     /*
 740      * Check whether the top-level list is in order.
 741      */
 742     for (i = 0; i < sk_IPAddressFamily_num(addr) - 1; i++) {
 743         const IPAddressFamily *a = sk_IPAddressFamily_value(addr, i);
 744         const IPAddressFamily *b = sk_IPAddressFamily_value(addr, i + 1);
 745         if (IPAddressFamily_cmp(&a, &b) >= 0)
 746             return 0;
 747     }
 748
 749     /*
 750      * Top level's ok, now check each address family.
 751      */
 752     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 753         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
 754         int length = length_from_afi(v3_addr_get_afi(f));
 755
 756         /*
 757          * Inheritance is canonical.  Anything other than inheritance or
 758          * a SEQUENCE OF IPAddressOrRange is an ASN.1 error or something.
 759          */
 760         if (f == NULL || f->ipAddressChoice == NULL)
 761             return 0;
 762         switch (f->ipAddressChoice->type) {
 763         case IPAddressChoice_inherit:
 764             continue;
 765         case IPAddressChoice_addressesOrRanges:
 766             break;
 767         default:
 768             return 0;
 769         }
 770
 771         /*
 772          * It's an IPAddressOrRanges sequence, check it.
 773          */
 774         aors = f->ipAddressChoice->u.addressesOrRanges;
 775         if (sk_IPAddressOrRange_num(aors) == 0)
 776             return 0;
 777         for (j = 0; j < sk_IPAddressOrRange_num(aors) - 1; j++) {
 778             IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
 779             IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, j + 1);
 780
 781             if (!extract_min_max(a, a_min, a_max, length) ||
 782                 !extract_min_max(b, b_min, b_max, length))
 783                 return 0;
 784
 785             /*
 786              * Punt misordered list, overlapping start, or inverted range.
 787              */
 788             if (memcmp(a_min, b_min, length) >= 0 ||
 789                 memcmp(a_min, a_max, length) > 0 ||
 790                 memcmp(b_min, b_max, length) > 0)
 791                 return 0;
 792
 793             /*
 794              * Punt if adjacent or overlapping.  Check for adjacency by
 795              * subtracting one from b_min first.
 796              */
 797             for (k = length - 1; k >= 0 && b_min[k]-- == 0x00; k--) ;
 798             if (memcmp(a_max, b_min, length) >= 0)
 799                 return 0;
 800
 801             /*
 802              * Check for range that should be expressed as a prefix.
 803              */
 804             if (a->type == IPAddressOrRange_addressRange &&
 805                 range_should_be_prefix(a_min, a_max, length) >= 0)
 806                 return 0;
 807         }
 808
 809         /*
 810          * Check range to see if it's inverted or should be a
 811          * prefix.
 812          */
 813         j = sk_IPAddressOrRange_num(aors) - 1;
 814         {
 815             IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
 816             if (a != NULL && a->type == IPAddressOrRange_addressRange) {
 817                 if (!extract_min_max(a, a_min, a_max, length))
 818                     return 0;
 819                 if (memcmp(a_min, a_max, length) > 0 ||
 820                     range_should_be_prefix(a_min, a_max, length) >= 0)
 821                     return 0;
 822             }
 823         }
 824     }
 825
 826     /*
 827      * If we made it through all that, we're happy.
 828      */
 829     return 1;
 830 }
 831
 832 /*
 833  * Whack an IPAddressOrRanges into canonical form.
 834  */
 835 static int IPAddressOrRanges_canonize(IPAddressOrRanges *aors,
 836                                       const unsigned afi)
 837 {
 838     int i, j, length = length_from_afi(afi);
 839
 840     /*
 841      * Sort the IPAddressOrRanges sequence.
 842      */
 843     sk_IPAddressOrRange_sort(aors);
 844
 845     /*
 846      * Clean up representation issues, punt on duplicates or overlaps.
 847      */
 848     for (i = 0; i < sk_IPAddressOrRange_num(aors) - 1; i++) {
 849         IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, i);
 850         IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, i + 1);
 851         unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
 852         unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
 853
 854         if (!extract_min_max(a, a_min, a_max, length) ||
 855             !extract_min_max(b, b_min, b_max, length))
 856             return 0;
 857
 858         /*
 859          * Punt inverted ranges.
 860          */
 861         if (memcmp(a_min, a_max, length) > 0 ||
 862             memcmp(b_min, b_max, length) > 0)
 863             return 0;
 864
 865         /*
 866          * Punt overlaps.
 867          */
 868         if (memcmp(a_max, b_min, length) >= 0)
 869             return 0;
 870
 871         /*
 872          * Merge if a and b are adjacent.  We check for
 873          * adjacency by subtracting one from b_min first.
 874          */
 875         for (j = length - 1; j >= 0 && b_min[j]-- == 0x00; j--) ;
 876         if (memcmp(a_max, b_min, length) == 0) {
 877             IPAddressOrRange *merged;
 878             if (!make_addressRange(&merged, a_min, b_max, length))
 879                 return 0;
 880             (void)sk_IPAddressOrRange_set(aors, i, merged);
 881             (void)sk_IPAddressOrRange_delete(aors, i + 1);
 882             IPAddressOrRange_free(a);
 883             IPAddressOrRange_free(b);
 884             --i;
 885             continue;
 886         }
 887     }
 888
 889     /*
 890      * Check for inverted final range.
 891      */
 892     j = sk_IPAddressOrRange_num(aors) - 1;
 893     {
 894         IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
 895         if (a != NULL && a->type == IPAddressOrRange_addressRange) {
 896             unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
 897             extract_min_max(a, a_min, a_max, length);
 898             if (memcmp(a_min, a_max, length) > 0)
 899                 return 0;
 900         }
 901     }
 902
 903     return 1;
 904 }
 905
 906 /*
 907  * Whack an IPAddrBlocks extension into canonical form.
 908  */
 909 int v3_addr_canonize(IPAddrBlocks *addr)
 910 {
 911     int i;
 912     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 913         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
 914         if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
 915             !IPAddressOrRanges_canonize(f->ipAddressChoice->
 916                                         u.addressesOrRanges,
 917                                         v3_addr_get_afi(f)))
 918             return 0;
 919     }
 920     (void)sk_IPAddressFamily_set_cmp_func(addr, IPAddressFamily_cmp);
 921     sk_IPAddressFamily_sort(addr);
 922     OPENSSL_assert(v3_addr_is_canonical(addr));
 923     return 1;
 924 }
 925
 926 /*
 927  * v2i handler for the IPAddrBlocks extension.
 928  */
 929 static void *v2i_IPAddrBlocks(const struct v3_ext_method *method,
 930                               struct v3_ext_ctx *ctx,
 931                               STACK_OF(CONF_VALUE) *values)
 932 {
 933     static const char v4addr_chars[] = "0123456789.";
 934     static const char v6addr_chars[] = "0123456789.:abcdefABCDEF";
 935     IPAddrBlocks *addr = NULL;
 936     char *s = NULL, *t;
 937     int i;
 938
 939     if ((addr = sk_IPAddressFamily_new(IPAddressFamily_cmp)) == NULL) {
 940         X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
 941         return NULL;
 942     }
 943
 944     for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
 945         CONF_VALUE *val = sk_CONF_VALUE_value(values, i);
 946         unsigned char min[ADDR_RAW_BUF_LEN], max[ADDR_RAW_BUF_LEN];
 947         unsigned afi, *safi = NULL, safi_;
 948         const char *addr_chars;
 949         int prefixlen, i1, i2, delim, length;
 950
 951         if (!name_cmp(val->name, "IPv4")) {
 952             afi = IANA_AFI_IPV4;
 953         } else if (!name_cmp(val->name, "IPv6")) {
 954             afi = IANA_AFI_IPV6;
 955         } else if (!name_cmp(val->name, "IPv4-SAFI")) {
 956             afi = IANA_AFI_IPV4;
 957             safi = &safi_;
 958         } else if (!name_cmp(val->name, "IPv6-SAFI")) {
 959             afi = IANA_AFI_IPV6;
 960             safi = &safi_;
 961         } else {
 962             X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
 963                       X509V3_R_EXTENSION_NAME_ERROR);
 964             X509V3_conf_err(val);
 965             goto err;
 966         }
 967
 968         switch (afi) {
 969         case IANA_AFI_IPV4:
 970             addr_chars = v4addr_chars;
 971             break;
 972         case IANA_AFI_IPV6:
 973             addr_chars = v6addr_chars;
 974             break;
 975         }
 976
 977         length = length_from_afi(afi);
 978
 979         /*
 980          * Handle SAFI, if any, and BUF_strdup() so we can null-terminate
 981          * the other input values.
 982          */
 983         if (safi != NULL) {
 984             *safi = strtoul(val->value, &t, 0);
 985             t += strspn(t, " \t");
 986             if (*safi > 0xFF || *t++ != ':') {
 987                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, X509V3_R_INVALID_SAFI);
 988                 X509V3_conf_err(val);
 989                 goto err;
 990             }
 991             t += strspn(t, " \t");
 992             s = BUF_strdup(t);
 993         } else {
 994             s = BUF_strdup(val->value);
 995         }
 996         if (s == NULL) {
 997             X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
 998             goto err;
 999         }
1000
1001         /*
1002          * Check for inheritance.  Not worth additional complexity to
1003          * optimize this (seldom-used) case.
1004          */
1005         if (!strcmp(s, "inherit")) {
1006             if (!v3_addr_add_inherit(addr, afi, safi)) {
1007                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1008                           X509V3_R_INVALID_INHERITANCE);
1009                 X509V3_conf_err(val);
1010                 goto err;
1011             }
1012             OPENSSL_free(s);
1013             s = NULL;
1014             continue;
1015         }
1016
1017         i1 = strspn(s, addr_chars);
1018         i2 = i1 + strspn(s + i1, " \t");
1019         delim = s[i2++];
1020         s[i1] = '\0';
1021
1022         if (a2i_ipadd(min, s) != length) {
1023             X509V3err(X509V3_F_V2I_IPADDRBLOCKS, X509V3_R_INVALID_IPADDRESS);
1024             X509V3_conf_err(val);
1025             goto err;
1026         }
1027
1028         switch (delim) {
1029         case '/':
1030             prefixlen = (int)strtoul(s + i2, &t, 10);
1031             if (t == s + i2 || *t != '\0') {
1032                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1033                           X509V3_R_EXTENSION_VALUE_ERROR);
1034                 X509V3_conf_err(val);
1035                 goto err;
1036             }
1037             if (!v3_addr_add_prefix(addr, afi, safi, min, prefixlen)) {
1038                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
1039                 goto err;
1040             }
1041             break;
1042         case '-':
1043             i1 = i2 + strspn(s + i2, " \t");
1044             i2 = i1 + strspn(s + i1, addr_chars);
1045             if (i1 == i2 || s[i2] != '\0') {
1046                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1047                           X509V3_R_EXTENSION_VALUE_ERROR);
1048                 X509V3_conf_err(val);
1049                 goto err;
1050             }
1051             if (a2i_ipadd(max, s + i1) != length) {
1052                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1053                           X509V3_R_INVALID_IPADDRESS);
1054                 X509V3_conf_err(val);
1055                 goto err;
1056             }
1057             if (memcmp(min, max, length_from_afi(afi)) > 0) {
1058                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1059                           X509V3_R_EXTENSION_VALUE_ERROR);
1060                 X509V3_conf_err(val);
1061                 goto err;
1062             }
1063             if (!v3_addr_add_range(addr, afi, safi, min, max)) {
1064                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
1065                 goto err;
1066             }
1067             break;
1068         case '\0':
1069             if (!v3_addr_add_prefix(addr, afi, safi, min, length * 8)) {
1070                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
1071                 goto err;
1072             }
1073             break;
1074         default:
1075             X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1076                       X509V3_R_EXTENSION_VALUE_ERROR);
1077             X509V3_conf_err(val);
1078             goto err;
1079         }
1080
1081         OPENSSL_free(s);
1082         s = NULL;
1083     }
1084
1085     /*
1086      * Canonize the result, then we're done.
1087      */
1088     if (!v3_addr_canonize(addr))
1089         goto err;
1090     return addr;
1091
1092  err:
1093     OPENSSL_free(s);
1094     sk_IPAddressFamily_pop_free(addr, IPAddressFamily_free);
1095     return NULL;
1096 }
1097
1098 /*
1099  * OpenSSL dispatch
1100  */
1101 const X509V3_EXT_METHOD v3_addr = {
1102     NID_sbgp_ipAddrBlock,       /* nid */
1103     0,                          /* flags */
1104     ASN1_ITEM_ref(IPAddrBlocks), /* template */
1105     0, 0, 0, 0,                 /* old functions, ignored */
1106     0,                          /* i2s */
1107     0,                          /* s2i */
1108     0,                          /* i2v */
1109     v2i_IPAddrBlocks,           /* v2i */
1110     i2r_IPAddrBlocks,           /* i2r */
1111     0,                          /* r2i */
1112     NULL                        /* extension-specific data */
1113 };
1114
1115 /*
1116  * Figure out whether extension sues inheritance.
1117  */
1118 int v3_addr_inherits(IPAddrBlocks *addr)
1119 {
1120     int i;
1121     if (addr == NULL)
1122         return 0;
1123     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
1124         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
1125         if (f->ipAddressChoice->type == IPAddressChoice_inherit)
1126             return 1;
1127     }
1128     return 0;
1129 }
1130
1131 /*
1132  * Figure out whether parent contains child.
1133  */
1134 static int addr_contains(IPAddressOrRanges *parent,
1135                          IPAddressOrRanges *child, int length)
1136 {
1137     unsigned char p_min[ADDR_RAW_BUF_LEN], p_max[ADDR_RAW_BUF_LEN];
1138     unsigned char c_min[ADDR_RAW_BUF_LEN], c_max[ADDR_RAW_BUF_LEN];
1139     int p, c;
1140
1141     if (child == NULL || parent == child)
1142         return 1;
1143     if (parent == NULL)
1144         return 0;
1145
1146     p = 0;
1147     for (c = 0; c < sk_IPAddressOrRange_num(child); c++) {
1148         if (!extract_min_max(sk_IPAddressOrRange_value(child, c),
1149                              c_min, c_max, length))
1150             return -1;
1151         for (;; p++) {
1152             if (p >= sk_IPAddressOrRange_num(parent))
1153                 return 0;
1154             if (!extract_min_max(sk_IPAddressOrRange_value(parent, p),
1155                                  p_min, p_max, length))
1156                 return 0;
1157             if (memcmp(p_max, c_max, length) < 0)
1158                 continue;
1159             if (memcmp(p_min, c_min, length) > 0)
1160                 return 0;
1161             break;
1162         }
1163     }
1164
1165     return 1;
1166 }
1167
1168 /*
1169  * Test whether a is a subset of b.
1170  */
1171 int v3_addr_subset(IPAddrBlocks *a, IPAddrBlocks *b)
1172 {
1173     int i;
1174     if (a == NULL || a == b)
1175         return 1;
1176     if (b == NULL || v3_addr_inherits(a) || v3_addr_inherits(b))
1177         return 0;
1178     (void)sk_IPAddressFamily_set_cmp_func(b, IPAddressFamily_cmp);
1179     for (i = 0; i < sk_IPAddressFamily_num(a); i++) {
1180         IPAddressFamily *fa = sk_IPAddressFamily_value(a, i);
1181         int j = sk_IPAddressFamily_find(b, fa);
1182         IPAddressFamily *fb;
1183         fb = sk_IPAddressFamily_value(b, j);
1184         if (fb == NULL)
1185             return 0;
1186         if (!addr_contains(fb->ipAddressChoice->u.addressesOrRanges,
1187                            fa->ipAddressChoice->u.addressesOrRanges,
1188                            length_from_afi(v3_addr_get_afi(fb))))
1189             return 0;
1190     }
1191     return 1;
1192 }
1193
1194 /*
1195  * Validation error handling via callback.
1196  */
1197 #define validation_err(_err_)           \
1198   do {                                  \
1199     if (ctx != NULL) {                  \
1200       ctx->error = _err_;               \
1201       ctx->error_depth = i;             \
1202       ctx->current_cert = x;            \
1203       ret = ctx->verify_cb(0, ctx);     \
1204     } else {                            \
1205       ret = 0;                          \
1206     }                                   \
1207     if (!ret)                           \
1208       goto done;                        \
1209   } while (0)
1210
1211 /*
1212  * Core code for RFC 3779 2.3 path validation.
1213  */
1214 static int v3_addr_validate_path_internal(X509_STORE_CTX *ctx,
1215                                           STACK_OF(X509) *chain,
1216                                           IPAddrBlocks *ext)
1217 {
1218     IPAddrBlocks *child = NULL;
1219     int i, j, ret = 1;
1220     X509 *x;
1221
1222     OPENSSL_assert(chain != NULL && sk_X509_num(chain) > 0);
1223     OPENSSL_assert(ctx != NULL || ext != NULL);
1224     OPENSSL_assert(ctx == NULL || ctx->verify_cb != NULL);
1225
1226     /*
1227      * Figure out where to start.  If we don't have an extension to
1228      * check, we're done.  Otherwise, check canonical form and
1229      * set up for walking up the chain.
1230      */
1231     if (ext != NULL) {
1232         i = -1;
1233         x = NULL;
1234     } else {
1235         i = 0;
1236         x = sk_X509_value(chain, i);
1237         OPENSSL_assert(x != NULL);
1238         if ((ext = x->rfc3779_addr) == NULL)
1239             goto done;
1240     }
1241     if (!v3_addr_is_canonical(ext))
1242         validation_err(X509_V_ERR_INVALID_EXTENSION);
1243     (void)sk_IPAddressFamily_set_cmp_func(ext, IPAddressFamily_cmp);
1244     if ((child = sk_IPAddressFamily_dup(ext)) == NULL) {
1245         X509V3err(X509V3_F_V3_ADDR_VALIDATE_PATH_INTERNAL,
1246                   ERR_R_MALLOC_FAILURE);
1247         ret = 0;
1248         goto done;
1249     }
1250
1251     /*
1252      * Now walk up the chain.  No cert may list resources that its
1253      * parent doesn't list.
1254      */
1255     for (i++; i < sk_X509_num(chain); i++) {
1256         x = sk_X509_value(chain, i);
1257         OPENSSL_assert(x != NULL);
1258         if (!v3_addr_is_canonical(x->rfc3779_addr))
1259             validation_err(X509_V_ERR_INVALID_EXTENSION);
1260         if (x->rfc3779_addr == NULL) {
1261             for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
1262                 IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
1263                 if (fc->ipAddressChoice->type != IPAddressChoice_inherit) {
1264                     validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1265                     break;
1266                 }
1267             }
1268             continue;
1269         }
1270         (void)sk_IPAddressFamily_set_cmp_func(x->rfc3779_addr,
1271                                               IPAddressFamily_cmp);
1272         for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
1273             IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
1274             int k = sk_IPAddressFamily_find(x->rfc3779_addr, fc);
1275             IPAddressFamily *fp =
1276                 sk_IPAddressFamily_value(x->rfc3779_addr, k);
1277             if (fp == NULL) {
1278                 if (fc->ipAddressChoice->type ==
1279                     IPAddressChoice_addressesOrRanges) {
1280                     validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1281                     break;
1282                 }
1283                 continue;
1284             }
1285             if (fp->ipAddressChoice->type ==
1286                 IPAddressChoice_addressesOrRanges) {
1287                 if (fc->ipAddressChoice->type == IPAddressChoice_inherit
1288                     || addr_contains(fp->ipAddressChoice->u.addressesOrRanges,
1289                                      fc->ipAddressChoice->u.addressesOrRanges,
1290                                      length_from_afi(v3_addr_get_afi(fc))))
1291                     sk_IPAddressFamily_set(child, j, fp);
1292                 else
1293                     validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1294             }
1295         }
1296     }
1297
1298     /*
1299      * Trust anchor can't inherit.
1300      */
1301     OPENSSL_assert(x != NULL);
1302     if (x->rfc3779_addr != NULL) {
1303         for (j = 0; j < sk_IPAddressFamily_num(x->rfc3779_addr); j++) {
1304             IPAddressFamily *fp =
1305                 sk_IPAddressFamily_value(x->rfc3779_addr, j);
1306             if (fp->ipAddressChoice->type == IPAddressChoice_inherit
1307                 && sk_IPAddressFamily_find(child, fp) >= 0)
1308                 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1309         }
1310     }
1311
1312  done:
1313     sk_IPAddressFamily_free(child);
1314     return ret;
1315 }
1316
1317 #undef validation_err
1318
1319 /*
1320  * RFC 3779 2.3 path validation -- called from X509_verify_cert().
1321  */
1322 int v3_addr_validate_path(X509_STORE_CTX *ctx)
1323 {
1324     return v3_addr_validate_path_internal(ctx, ctx->chain, NULL);
1325 }
1326
1327 /*
1328  * RFC 3779 2.3 path validation of an extension.
1329  * Test whether chain covers extension.
1330  */
1331 int v3_addr_validate_resource_set(STACK_OF(X509) *chain,
1332                                   IPAddrBlocks *ext, int allow_inheritance)
1333 {
1334     if (ext == NULL)
1335         return 1;
1336     if (chain == NULL || sk_X509_num(chain) == 0)
1337         return 0;
1338     if (!allow_inheritance && v3_addr_inherits(ext))
1339         return 0;
1340     return v3_addr_validate_path_internal(NULL, chain, ext);
1341 }