crypto/x509v3/v3_addr.c

   1 /*
   2  * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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 2.2.
  12  */
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16
  17 #include "internal/cryptlib.h"
  18 #include <openssl/conf.h>
  19 #include <openssl/asn1.h>
  20 #include <openssl/asn1t.h>
  21 #include <openssl/buffer.h>
  22 #include <openssl/x509v3.h>
  23 #include "internal/x509_int.h"
  24 #include "ext_dat.h"
  25
  26 #ifndef OPENSSL_NO_RFC3779
  27
  28 /*
  29  * OpenSSL ASN.1 template translation of RFC 3779 2.2.3.
  30  */
  31
  32 ASN1_SEQUENCE(IPAddressRange) = {
  33   ASN1_SIMPLE(IPAddressRange, min, ASN1_BIT_STRING),
  34   ASN1_SIMPLE(IPAddressRange, max, ASN1_BIT_STRING)
  35 } ASN1_SEQUENCE_END(IPAddressRange)
  36
  37 ASN1_CHOICE(IPAddressOrRange) = {
  38   ASN1_SIMPLE(IPAddressOrRange, u.addressPrefix, ASN1_BIT_STRING),
  39   ASN1_SIMPLE(IPAddressOrRange, u.addressRange,  IPAddressRange)
  40 } ASN1_CHOICE_END(IPAddressOrRange)
  41
  42 ASN1_CHOICE(IPAddressChoice) = {
  43   ASN1_SIMPLE(IPAddressChoice,      u.inherit,           ASN1_NULL),
  44   ASN1_SEQUENCE_OF(IPAddressChoice, u.addressesOrRanges, IPAddressOrRange)
  45 } ASN1_CHOICE_END(IPAddressChoice)
  46
  47 ASN1_SEQUENCE(IPAddressFamily) = {
  48   ASN1_SIMPLE(IPAddressFamily, addressFamily,   ASN1_OCTET_STRING),
  49   ASN1_SIMPLE(IPAddressFamily, ipAddressChoice, IPAddressChoice)
  50 } ASN1_SEQUENCE_END(IPAddressFamily)
  51
  52 ASN1_ITEM_TEMPLATE(IPAddrBlocks) =
  53   ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0,
  54                         IPAddrBlocks, IPAddressFamily)
  55 static_ASN1_ITEM_TEMPLATE_END(IPAddrBlocks)
  56
  57 IMPLEMENT_ASN1_FUNCTIONS(IPAddressRange)
  58 IMPLEMENT_ASN1_FUNCTIONS(IPAddressOrRange)
  59 IMPLEMENT_ASN1_FUNCTIONS(IPAddressChoice)
  60 IMPLEMENT_ASN1_FUNCTIONS(IPAddressFamily)
  61
  62 /*
  63  * How much buffer space do we need for a raw address?
  64  */
  65 #define ADDR_RAW_BUF_LEN        16
  66
  67 /*
  68  * What's the address length associated with this AFI?
  69  */
  70 static int length_from_afi(const unsigned afi)
  71 {
  72     switch (afi) {
  73     case IANA_AFI_IPV4:
  74         return 4;
  75     case IANA_AFI_IPV6:
  76         return 16;
  77     default:
  78         return 0;
  79     }
  80 }
  81
  82 /*
  83  * Extract the AFI from an IPAddressFamily.
  84  */
  85 unsigned int X509v3_addr_get_afi(const IPAddressFamily *f)
  86 {
  87     if (f == NULL
  88             || f->addressFamily == NULL
  89             || f->addressFamily->data == NULL
  90             || f->addressFamily->length < 2)
  91         return 0;
  92     return (f->addressFamily->data[0] << 8) | f->addressFamily->data[1];
  93 }
  94
  95 /*
  96  * Expand the bitstring form of an address into a raw byte array.
  97  * At the moment this is coded for simplicity, not speed.
  98  */
  99 static int addr_expand(unsigned char *addr,
 100                        const ASN1_BIT_STRING *bs,
 101                        const int length, const unsigned char fill)
 102 {
 103     if (bs->length < 0 || bs->length > length)
 104         return 0;
 105     if (bs->length > 0) {
 106         memcpy(addr, bs->data, bs->length);
 107         if ((bs->flags & 7) != 0) {
 108             unsigned char mask = 0xFF >> (8 - (bs->flags & 7));
 109             if (fill == 0)
 110                 addr[bs->length - 1] &= ~mask;
 111             else
 112                 addr[bs->length - 1] |= mask;
 113         }
 114     }
 115     memset(addr + bs->length, fill, length - bs->length);
 116     return 1;
 117 }
 118
 119 /*
 120  * Extract the prefix length from a bitstring.
 121  */
 122 #define addr_prefixlen(bs) ((int) ((bs)->length * 8 - ((bs)->flags & 7)))
 123
 124 /*
 125  * i2r handler for one address bitstring.
 126  */
 127 static int i2r_address(BIO *out,
 128                        const unsigned afi,
 129                        const unsigned char fill, const ASN1_BIT_STRING *bs)
 130 {
 131     unsigned char addr[ADDR_RAW_BUF_LEN];
 132     int i, n;
 133
 134     if (bs->length < 0)
 135         return 0;
 136     switch (afi) {
 137     case IANA_AFI_IPV4:
 138         if (!addr_expand(addr, bs, 4, fill))
 139             return 0;
 140         BIO_printf(out, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
 141         break;
 142     case IANA_AFI_IPV6:
 143         if (!addr_expand(addr, bs, 16, fill))
 144             return 0;
 145         for (n = 16; n > 1 && addr[n - 1] == 0x00 && addr[n - 2] == 0x00;
 146              n -= 2) ;
 147         for (i = 0; i < n; i += 2)
 148             BIO_printf(out, "%x%s", (addr[i] << 8) | addr[i + 1],
 149                        (i < 14 ? ":" : ""));
 150         if (i < 16)
 151             BIO_puts(out, ":");
 152         if (i == 0)
 153             BIO_puts(out, ":");
 154         break;
 155     default:
 156         for (i = 0; i < bs->length; i++)
 157             BIO_printf(out, "%s%02x", (i > 0 ? ":" : ""), bs->data[i]);
 158         BIO_printf(out, "[%d]", (int)(bs->flags & 7));
 159         break;
 160     }
 161     return 1;
 162 }
 163
 164 /*
 165  * i2r handler for a sequence of addresses and ranges.
 166  */
 167 static int i2r_IPAddressOrRanges(BIO *out,
 168                                  const int indent,
 169                                  const IPAddressOrRanges *aors,
 170                                  const unsigned afi)
 171 {
 172     int i;
 173     for (i = 0; i < sk_IPAddressOrRange_num(aors); i++) {
 174         const IPAddressOrRange *aor = sk_IPAddressOrRange_value(aors, i);
 175         BIO_printf(out, "%*s", indent, "");
 176         switch (aor->type) {
 177         case IPAddressOrRange_addressPrefix:
 178             if (!i2r_address(out, afi, 0x00, aor->u.addressPrefix))
 179                 return 0;
 180             BIO_printf(out, "/%d\n", addr_prefixlen(aor->u.addressPrefix));
 181             continue;
 182         case IPAddressOrRange_addressRange:
 183             if (!i2r_address(out, afi, 0x00, aor->u.addressRange->min))
 184                 return 0;
 185             BIO_puts(out, "-");
 186             if (!i2r_address(out, afi, 0xFF, aor->u.addressRange->max))
 187                 return 0;
 188             BIO_puts(out, "\n");
 189             continue;
 190         }
 191     }
 192     return 1;
 193 }
 194
 195 /*
 196  * i2r handler for an IPAddrBlocks extension.
 197  */
 198 static int i2r_IPAddrBlocks(const X509V3_EXT_METHOD *method,
 199                             void *ext, BIO *out, int indent)
 200 {
 201     const IPAddrBlocks *addr = ext;
 202     int i;
 203     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 204         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
 205         const unsigned int afi = X509v3_addr_get_afi(f);
 206         switch (afi) {
 207         case IANA_AFI_IPV4:
 208             BIO_printf(out, "%*sIPv4", indent, "");
 209             break;
 210         case IANA_AFI_IPV6:
 211             BIO_printf(out, "%*sIPv6", indent, "");
 212             break;
 213         default:
 214             BIO_printf(out, "%*sUnknown AFI %u", indent, "", afi);
 215             break;
 216         }
 217         if (f->addressFamily->length > 2) {
 218             switch (f->addressFamily->data[2]) {
 219             case 1:
 220                 BIO_puts(out, " (Unicast)");
 221                 break;
 222             case 2:
 223                 BIO_puts(out, " (Multicast)");
 224                 break;
 225             case 3:
 226                 BIO_puts(out, " (Unicast/Multicast)");
 227                 break;
 228             case 4:
 229                 BIO_puts(out, " (MPLS)");
 230                 break;
 231             case 64:
 232                 BIO_puts(out, " (Tunnel)");
 233                 break;
 234             case 65:
 235                 BIO_puts(out, " (VPLS)");
 236                 break;
 237             case 66:
 238                 BIO_puts(out, " (BGP MDT)");
 239                 break;
 240             case 128:
 241                 BIO_puts(out, " (MPLS-labeled VPN)");
 242                 break;
 243             default:
 244                 BIO_printf(out, " (Unknown SAFI %u)",
 245                            (unsigned)f->addressFamily->data[2]);
 246                 break;
 247             }
 248         }
 249         switch (f->ipAddressChoice->type) {
 250         case IPAddressChoice_inherit:
 251             BIO_puts(out, ": inherit\n");
 252             break;
 253         case IPAddressChoice_addressesOrRanges:
 254             BIO_puts(out, ":\n");
 255             if (!i2r_IPAddressOrRanges(out,
 256                                        indent + 2,
 257                                        f->ipAddressChoice->
 258                                        u.addressesOrRanges, afi))
 259                 return 0;
 260             break;
 261         }
 262     }
 263     return 1;
 264 }
 265
 266 /*
 267  * Sort comparison function for a sequence of IPAddressOrRange
 268  * elements.
 269  *
 270  * There's no sane answer we can give if addr_expand() fails, and an
 271  * assertion failure on externally supplied data is seriously uncool,
 272  * so we just arbitrarily declare that if given invalid inputs this
 273  * function returns -1.  If this messes up your preferred sort order
 274  * for garbage input, tough noogies.
 275  */
 276 static int IPAddressOrRange_cmp(const IPAddressOrRange *a,
 277                                 const IPAddressOrRange *b, const int length)
 278 {
 279     unsigned char addr_a[ADDR_RAW_BUF_LEN], addr_b[ADDR_RAW_BUF_LEN];
 280     int prefixlen_a = 0, prefixlen_b = 0;
 281     int r;
 282
 283     switch (a->type) {
 284     case IPAddressOrRange_addressPrefix:
 285         if (!addr_expand(addr_a, a->u.addressPrefix, length, 0x00))
 286             return -1;
 287         prefixlen_a = addr_prefixlen(a->u.addressPrefix);
 288         break;
 289     case IPAddressOrRange_addressRange:
 290         if (!addr_expand(addr_a, a->u.addressRange->min, length, 0x00))
 291             return -1;
 292         prefixlen_a = length * 8;
 293         break;
 294     }
 295
 296     switch (b->type) {
 297     case IPAddressOrRange_addressPrefix:
 298         if (!addr_expand(addr_b, b->u.addressPrefix, length, 0x00))
 299             return -1;
 300         prefixlen_b = addr_prefixlen(b->u.addressPrefix);
 301         break;
 302     case IPAddressOrRange_addressRange:
 303         if (!addr_expand(addr_b, b->u.addressRange->min, length, 0x00))
 304             return -1;
 305         prefixlen_b = length * 8;
 306         break;
 307     }
 308
 309     if ((r = memcmp(addr_a, addr_b, length)) != 0)
 310         return r;
 311     else
 312         return prefixlen_a - prefixlen_b;
 313 }
 314
 315 /*
 316  * IPv4-specific closure over IPAddressOrRange_cmp, since sk_sort()
 317  * comparison routines are only allowed two arguments.
 318  */
 319 static int v4IPAddressOrRange_cmp(const IPAddressOrRange *const *a,
 320                                   const IPAddressOrRange *const *b)
 321 {
 322     return IPAddressOrRange_cmp(*a, *b, 4);
 323 }
 324
 325 /*
 326  * IPv6-specific closure over IPAddressOrRange_cmp, since sk_sort()
 327  * comparison routines are only allowed two arguments.
 328  */
 329 static int v6IPAddressOrRange_cmp(const IPAddressOrRange *const *a,
 330                                   const IPAddressOrRange *const *b)
 331 {
 332     return IPAddressOrRange_cmp(*a, *b, 16);
 333 }
 334
 335 /*
 336  * Calculate whether a range collapses to a prefix.
 337  * See last paragraph of RFC 3779 2.2.3.7.
 338  */
 339 static int range_should_be_prefix(const unsigned char *min,
 340                                   const unsigned char *max, const int length)
 341 {
 342     unsigned char mask;
 343     int i, j;
 344
 345     OPENSSL_assert(memcmp(min, max, length) <= 0);
 346     for (i = 0; i < length && min[i] == max[i]; i++) ;
 347     for (j = length - 1; j >= 0 && min[j] == 0x00 && max[j] == 0xFF; j--) ;
 348     if (i < j)
 349         return -1;
 350     if (i > j)
 351         return i * 8;
 352     mask = min[i] ^ max[i];
 353     switch (mask) {
 354     case 0x01:
 355         j = 7;
 356         break;
 357     case 0x03:
 358         j = 6;
 359         break;
 360     case 0x07:
 361         j = 5;
 362         break;
 363     case 0x0F:
 364         j = 4;
 365         break;
 366     case 0x1F:
 367         j = 3;
 368         break;
 369     case 0x3F:
 370         j = 2;
 371         break;
 372     case 0x7F:
 373         j = 1;
 374         break;
 375     default:
 376         return -1;
 377     }
 378     if ((min[i] & mask) != 0 || (max[i] & mask) != mask)
 379         return -1;
 380     else
 381         return i * 8 + j;
 382 }
 383
 384 /*
 385  * Construct a prefix.
 386  */
 387 static int make_addressPrefix(IPAddressOrRange **result,
 388                               unsigned char *addr, const int prefixlen)
 389 {
 390     int bytelen = (prefixlen + 7) / 8, bitlen = prefixlen % 8;
 391     IPAddressOrRange *aor = IPAddressOrRange_new();
 392
 393     if (aor == NULL)
 394         return 0;
 395     aor->type = IPAddressOrRange_addressPrefix;
 396     if (aor->u.addressPrefix == NULL &&
 397         (aor->u.addressPrefix = ASN1_BIT_STRING_new()) == NULL)
 398         goto err;
 399     if (!ASN1_BIT_STRING_set(aor->u.addressPrefix, addr, bytelen))
 400         goto err;
 401     aor->u.addressPrefix->flags &= ~7;
 402     aor->u.addressPrefix->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 403     if (bitlen > 0) {
 404         aor->u.addressPrefix->data[bytelen - 1] &= ~(0xFF >> bitlen);
 405         aor->u.addressPrefix->flags |= 8 - bitlen;
 406     }
 407
 408     *result = aor;
 409     return 1;
 410
 411  err:
 412     IPAddressOrRange_free(aor);
 413     return 0;
 414 }
 415
 416 /*
 417  * Construct a range.  If it can be expressed as a prefix,
 418  * return a prefix instead.  Doing this here simplifies
 419  * the rest of the code considerably.
 420  */
 421 static int make_addressRange(IPAddressOrRange **result,
 422                              unsigned char *min,
 423                              unsigned char *max, const int length)
 424 {
 425     IPAddressOrRange *aor;
 426     int i, prefixlen;
 427
 428     if ((prefixlen = range_should_be_prefix(min, max, length)) >= 0)
 429         return make_addressPrefix(result, min, prefixlen);
 430
 431     if ((aor = IPAddressOrRange_new()) == NULL)
 432         return 0;
 433     aor->type = IPAddressOrRange_addressRange;
 434     OPENSSL_assert(aor->u.addressRange == NULL);
 435     if ((aor->u.addressRange = IPAddressRange_new()) == NULL)
 436         goto err;
 437     if (aor->u.addressRange->min == NULL &&
 438         (aor->u.addressRange->min = ASN1_BIT_STRING_new()) == NULL)
 439         goto err;
 440     if (aor->u.addressRange->max == NULL &&
 441         (aor->u.addressRange->max = ASN1_BIT_STRING_new()) == NULL)
 442         goto err;
 443
 444     for (i = length; i > 0 && min[i - 1] == 0x00; --i) ;
 445     if (!ASN1_BIT_STRING_set(aor->u.addressRange->min, min, i))
 446         goto err;
 447     aor->u.addressRange->min->flags &= ~7;
 448     aor->u.addressRange->min->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 449     if (i > 0) {
 450         unsigned char b = min[i - 1];
 451         int j = 1;
 452         while ((b & (0xFFU >> j)) != 0)
 453             ++j;
 454         aor->u.addressRange->min->flags |= 8 - j;
 455     }
 456
 457     for (i = length; i > 0 && max[i - 1] == 0xFF; --i) ;
 458     if (!ASN1_BIT_STRING_set(aor->u.addressRange->max, max, i))
 459         goto err;
 460     aor->u.addressRange->max->flags &= ~7;
 461     aor->u.addressRange->max->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 462     if (i > 0) {
 463         unsigned char b = max[i - 1];
 464         int j = 1;
 465         while ((b & (0xFFU >> j)) != (0xFFU >> j))
 466             ++j;
 467         aor->u.addressRange->max->flags |= 8 - j;
 468     }
 469
 470     *result = aor;
 471     return 1;
 472
 473  err:
 474     IPAddressOrRange_free(aor);
 475     return 0;
 476 }
 477
 478 /*
 479  * Construct a new address family or find an existing one.
 480  */
 481 static IPAddressFamily *make_IPAddressFamily(IPAddrBlocks *addr,
 482                                              const unsigned afi,
 483                                              const unsigned *safi)
 484 {
 485     IPAddressFamily *f;
 486     unsigned char key[3];
 487     int keylen;
 488     int i;
 489
 490     key[0] = (afi >> 8) & 0xFF;
 491     key[1] = afi & 0xFF;
 492     if (safi != NULL) {
 493         key[2] = *safi & 0xFF;
 494         keylen = 3;
 495     } else {
 496         keylen = 2;
 497     }
 498
 499     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 500         f = sk_IPAddressFamily_value(addr, i);
 501         OPENSSL_assert(f->addressFamily->data != NULL);
 502         if (f->addressFamily->length == keylen &&
 503             !memcmp(f->addressFamily->data, key, keylen))
 504             return f;
 505     }
 506
 507     if ((f = IPAddressFamily_new()) == NULL)
 508         goto err;
 509     if (f->ipAddressChoice == NULL &&
 510         (f->ipAddressChoice = IPAddressChoice_new()) == NULL)
 511         goto err;
 512     if (f->addressFamily == NULL &&
 513         (f->addressFamily = ASN1_OCTET_STRING_new()) == NULL)
 514         goto err;
 515     if (!ASN1_OCTET_STRING_set(f->addressFamily, key, keylen))
 516         goto err;
 517     if (!sk_IPAddressFamily_push(addr, f))
 518         goto err;
 519
 520     return f;
 521
 522  err:
 523     IPAddressFamily_free(f);
 524     return NULL;
 525 }
 526
 527 /*
 528  * Add an inheritance element.
 529  */
 530 int X509v3_addr_add_inherit(IPAddrBlocks *addr,
 531                             const unsigned afi, const unsigned *safi)
 532 {
 533     IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
 534     if (f == NULL ||
 535         f->ipAddressChoice == NULL ||
 536         (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
 537          f->ipAddressChoice->u.addressesOrRanges != NULL))
 538         return 0;
 539     if (f->ipAddressChoice->type == IPAddressChoice_inherit &&
 540         f->ipAddressChoice->u.inherit != NULL)
 541         return 1;
 542     if (f->ipAddressChoice->u.inherit == NULL &&
 543         (f->ipAddressChoice->u.inherit = ASN1_NULL_new()) == NULL)
 544         return 0;
 545     f->ipAddressChoice->type = IPAddressChoice_inherit;
 546     return 1;
 547 }
 548
 549 /*
 550  * Construct an IPAddressOrRange sequence, or return an existing one.
 551  */
 552 static IPAddressOrRanges *make_prefix_or_range(IPAddrBlocks *addr,
 553                                                const unsigned afi,
 554                                                const unsigned *safi)
 555 {
 556     IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
 557     IPAddressOrRanges *aors = NULL;
 558
 559     if (f == NULL ||
 560         f->ipAddressChoice == NULL ||
 561         (f->ipAddressChoice->type == IPAddressChoice_inherit &&
 562          f->ipAddressChoice->u.inherit != NULL))
 563         return NULL;
 564     if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges)
 565         aors = f->ipAddressChoice->u.addressesOrRanges;
 566     if (aors != NULL)
 567         return aors;
 568     if ((aors = sk_IPAddressOrRange_new_null()) == NULL)
 569         return NULL;
 570     switch (afi) {
 571     case IANA_AFI_IPV4:
 572         (void)sk_IPAddressOrRange_set_cmp_func(aors, v4IPAddressOrRange_cmp);
 573         break;
 574     case IANA_AFI_IPV6:
 575         (void)sk_IPAddressOrRange_set_cmp_func(aors, v6IPAddressOrRange_cmp);
 576         break;
 577     }
 578     f->ipAddressChoice->type = IPAddressChoice_addressesOrRanges;
 579     f->ipAddressChoice->u.addressesOrRanges = aors;
 580     return aors;
 581 }
 582
 583 /*
 584  * Add a prefix.
 585  */
 586 int X509v3_addr_add_prefix(IPAddrBlocks *addr,
 587                            const unsigned afi,
 588                            const unsigned *safi,
 589                            unsigned char *a, const int prefixlen)
 590 {
 591     IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
 592     IPAddressOrRange *aor;
 593     if (aors == NULL || !make_addressPrefix(&aor, a, prefixlen))
 594         return 0;
 595     if (sk_IPAddressOrRange_push(aors, aor))
 596         return 1;
 597     IPAddressOrRange_free(aor);
 598     return 0;
 599 }
 600
 601 /*
 602  * Add a range.
 603  */
 604 int X509v3_addr_add_range(IPAddrBlocks *addr,
 605                           const unsigned afi,
 606                           const unsigned *safi,
 607                           unsigned char *min, unsigned char *max)
 608 {
 609     IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
 610     IPAddressOrRange *aor;
 611     int length = length_from_afi(afi);
 612     if (aors == NULL)
 613         return 0;
 614     if (!make_addressRange(&aor, min, max, length))
 615         return 0;
 616     if (sk_IPAddressOrRange_push(aors, aor))
 617         return 1;
 618     IPAddressOrRange_free(aor);
 619     return 0;
 620 }
 621
 622 /*
 623  * Extract min and max values from an IPAddressOrRange.
 624  */
 625 static int extract_min_max(IPAddressOrRange *aor,
 626                            unsigned char *min, unsigned char *max, int length)
 627 {
 628     if (aor == NULL || min == NULL || max == NULL)
 629         return 0;
 630     switch (aor->type) {
 631     case IPAddressOrRange_addressPrefix:
 632         return (addr_expand(min, aor->u.addressPrefix, length, 0x00) &&
 633                 addr_expand(max, aor->u.addressPrefix, length, 0xFF));
 634     case IPAddressOrRange_addressRange:
 635         return (addr_expand(min, aor->u.addressRange->min, length, 0x00) &&
 636                 addr_expand(max, aor->u.addressRange->max, length, 0xFF));
 637     }
 638     return 0;
 639 }
 640
 641 /*
 642  * Public wrapper for extract_min_max().
 643  */
 644 int X509v3_addr_get_range(IPAddressOrRange *aor,
 645                           const unsigned afi,
 646                           unsigned char *min,
 647                           unsigned char *max, const int length)
 648 {
 649     int afi_length = length_from_afi(afi);
 650     if (aor == NULL || min == NULL || max == NULL ||
 651         afi_length == 0 || length < afi_length ||
 652         (aor->type != IPAddressOrRange_addressPrefix &&
 653          aor->type != IPAddressOrRange_addressRange) ||
 654         !extract_min_max(aor, min, max, afi_length))
 655         return 0;
 656
 657     return afi_length;
 658 }
 659
 660 /*
 661  * Sort comparison function for a sequence of IPAddressFamily.
 662  *
 663  * The last paragraph of RFC 3779 2.2.3.3 is slightly ambiguous about
 664  * the ordering: I can read it as meaning that IPv6 without a SAFI
 665  * comes before IPv4 with a SAFI, which seems pretty weird.  The
 666  * examples in appendix B suggest that the author intended the
 667  * null-SAFI rule to apply only within a single AFI, which is what I
 668  * would have expected and is what the following code implements.
 669  */
 670 static int IPAddressFamily_cmp(const IPAddressFamily *const *a_,
 671                                const IPAddressFamily *const *b_)
 672 {
 673     const ASN1_OCTET_STRING *a = (*a_)->addressFamily;
 674     const ASN1_OCTET_STRING *b = (*b_)->addressFamily;
 675     int len = ((a->length <= b->length) ? a->length : b->length);
 676     int cmp = memcmp(a->data, b->data, len);
 677     return cmp ? cmp : a->length - b->length;
 678 }
 679
 680 /*
 681  * Check whether an IPAddrBLocks is in canonical form.
 682  */
 683 int X509v3_addr_is_canonical(IPAddrBlocks *addr)
 684 {
 685     unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
 686     unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
 687     IPAddressOrRanges *aors;
 688     int i, j, k;
 689
 690     /*
 691      * Empty extension is canonical.
 692      */
 693     if (addr == NULL)
 694         return 1;
 695
 696     /*
 697      * Check whether the top-level list is in order.
 698      */
 699     for (i = 0; i < sk_IPAddressFamily_num(addr) - 1; i++) {
 700         const IPAddressFamily *a = sk_IPAddressFamily_value(addr, i);
 701         const IPAddressFamily *b = sk_IPAddressFamily_value(addr, i + 1);
 702         if (IPAddressFamily_cmp(&a, &b) >= 0)
 703             return 0;
 704     }
 705
 706     /*
 707      * Top level's ok, now check each address family.
 708      */
 709     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 710         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
 711         int length = length_from_afi(X509v3_addr_get_afi(f));
 712
 713         /*
 714          * Inheritance is canonical.  Anything other than inheritance or
 715          * a SEQUENCE OF IPAddressOrRange is an ASN.1 error or something.
 716          */
 717         if (f == NULL || f->ipAddressChoice == NULL)
 718             return 0;
 719         switch (f->ipAddressChoice->type) {
 720         case IPAddressChoice_inherit:
 721             continue;
 722         case IPAddressChoice_addressesOrRanges:
 723             break;
 724         default:
 725             return 0;
 726         }
 727
 728         /*
 729          * It's an IPAddressOrRanges sequence, check it.
 730          */
 731         aors = f->ipAddressChoice->u.addressesOrRanges;
 732         if (sk_IPAddressOrRange_num(aors) == 0)
 733             return 0;
 734         for (j = 0; j < sk_IPAddressOrRange_num(aors) - 1; j++) {
 735             IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
 736             IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, j + 1);
 737
 738             if (!extract_min_max(a, a_min, a_max, length) ||
 739                 !extract_min_max(b, b_min, b_max, length))
 740                 return 0;
 741
 742             /*
 743              * Punt misordered list, overlapping start, or inverted range.
 744              */
 745             if (memcmp(a_min, b_min, length) >= 0 ||
 746                 memcmp(a_min, a_max, length) > 0 ||
 747                 memcmp(b_min, b_max, length) > 0)
 748                 return 0;
 749
 750             /*
 751              * Punt if adjacent or overlapping.  Check for adjacency by
 752              * subtracting one from b_min first.
 753              */
 754             for (k = length - 1; k >= 0 && b_min[k]-- == 0x00; k--) ;
 755             if (memcmp(a_max, b_min, length) >= 0)
 756                 return 0;
 757
 758             /*
 759              * Check for range that should be expressed as a prefix.
 760              */
 761             if (a->type == IPAddressOrRange_addressRange &&
 762                 range_should_be_prefix(a_min, a_max, length) >= 0)
 763                 return 0;
 764         }
 765
 766         /*
 767          * Check range to see if it's inverted or should be a
 768          * prefix.
 769          */
 770         j = sk_IPAddressOrRange_num(aors) - 1;
 771         {
 772             IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
 773             if (a != NULL && a->type == IPAddressOrRange_addressRange) {
 774                 if (!extract_min_max(a, a_min, a_max, length))
 775                     return 0;
 776                 if (memcmp(a_min, a_max, length) > 0 ||
 777                     range_should_be_prefix(a_min, a_max, length) >= 0)
 778                     return 0;
 779             }
 780         }
 781     }
 782
 783     /*
 784      * If we made it through all that, we're happy.
 785      */
 786     return 1;
 787 }
 788
 789 /*
 790  * Whack an IPAddressOrRanges into canonical form.
 791  */
 792 static int IPAddressOrRanges_canonize(IPAddressOrRanges *aors,
 793                                       const unsigned afi)
 794 {
 795     int i, j, length = length_from_afi(afi);
 796
 797     /*
 798      * Sort the IPAddressOrRanges sequence.
 799      */
 800     sk_IPAddressOrRange_sort(aors);
 801
 802     /*
 803      * Clean up representation issues, punt on duplicates or overlaps.
 804      */
 805     for (i = 0; i < sk_IPAddressOrRange_num(aors) - 1; i++) {
 806         IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, i);
 807         IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, i + 1);
 808         unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
 809         unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
 810
 811         if (!extract_min_max(a, a_min, a_max, length) ||
 812             !extract_min_max(b, b_min, b_max, length))
 813             return 0;
 814
 815         /*
 816          * Punt inverted ranges.
 817          */
 818         if (memcmp(a_min, a_max, length) > 0 ||
 819             memcmp(b_min, b_max, length) > 0)
 820             return 0;
 821
 822         /*
 823          * Punt overlaps.
 824          */
 825         if (memcmp(a_max, b_min, length) >= 0)
 826             return 0;
 827
 828         /*
 829          * Merge if a and b are adjacent.  We check for
 830          * adjacency by subtracting one from b_min first.
 831          */
 832         for (j = length - 1; j >= 0 && b_min[j]-- == 0x00; j--) ;
 833         if (memcmp(a_max, b_min, length) == 0) {
 834             IPAddressOrRange *merged;
 835             if (!make_addressRange(&merged, a_min, b_max, length))
 836                 return 0;
 837             (void)sk_IPAddressOrRange_set(aors, i, merged);
 838             (void)sk_IPAddressOrRange_delete(aors, i + 1);
 839             IPAddressOrRange_free(a);
 840             IPAddressOrRange_free(b);
 841             --i;
 842             continue;
 843         }
 844     }
 845
 846     /*
 847      * Check for inverted final range.
 848      */
 849     j = sk_IPAddressOrRange_num(aors) - 1;
 850     {
 851         IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
 852         if (a != NULL && a->type == IPAddressOrRange_addressRange) {
 853             unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
 854             if (!extract_min_max(a, a_min, a_max, length))
 855                 return 0;
 856             if (memcmp(a_min, a_max, length) > 0)
 857                 return 0;
 858         }
 859     }
 860
 861     return 1;
 862 }
 863
 864 /*
 865  * Whack an IPAddrBlocks extension into canonical form.
 866  */
 867 int X509v3_addr_canonize(IPAddrBlocks *addr)
 868 {
 869     int i;
 870     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 871         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
 872         if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
 873             !IPAddressOrRanges_canonize(f->ipAddressChoice->
 874                                         u.addressesOrRanges,
 875                                         X509v3_addr_get_afi(f)))
 876             return 0;
 877     }
 878     (void)sk_IPAddressFamily_set_cmp_func(addr, IPAddressFamily_cmp);
 879     sk_IPAddressFamily_sort(addr);
 880     OPENSSL_assert(X509v3_addr_is_canonical(addr));
 881     return 1;
 882 }
 883
 884 /*
 885  * v2i handler for the IPAddrBlocks extension.
 886  */
 887 static void *v2i_IPAddrBlocks(const struct v3_ext_method *method,
 888                               struct v3_ext_ctx *ctx,
 889                               STACK_OF(CONF_VALUE) *values)
 890 {
 891     static const char v4addr_chars[] = "0123456789.";
 892     static const char v6addr_chars[] = "0123456789.:abcdefABCDEF";
 893     IPAddrBlocks *addr = NULL;
 894     char *s = NULL, *t;
 895     int i;
 896
 897     if ((addr = sk_IPAddressFamily_new(IPAddressFamily_cmp)) == NULL) {
 898         X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
 899         return NULL;
 900     }
 901
 902     for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
 903         CONF_VALUE *val = sk_CONF_VALUE_value(values, i);
 904         unsigned char min[ADDR_RAW_BUF_LEN], max[ADDR_RAW_BUF_LEN];
 905         unsigned afi, *safi = NULL, safi_;
 906         const char *addr_chars = NULL;
 907         int prefixlen, i1, i2, delim, length;
 908
 909         if (!name_cmp(val->name, "IPv4")) {
 910             afi = IANA_AFI_IPV4;
 911         } else if (!name_cmp(val->name, "IPv6")) {
 912             afi = IANA_AFI_IPV6;
 913         } else if (!name_cmp(val->name, "IPv4-SAFI")) {
 914             afi = IANA_AFI_IPV4;
 915             safi = &safi_;
 916         } else if (!name_cmp(val->name, "IPv6-SAFI")) {
 917             afi = IANA_AFI_IPV6;
 918             safi = &safi_;
 919         } else {
 920             X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
 921                       X509V3_R_EXTENSION_NAME_ERROR);
 922             X509V3_conf_err(val);
 923             goto err;
 924         }
 925
 926         switch (afi) {
 927         case IANA_AFI_IPV4:
 928             addr_chars = v4addr_chars;
 929             break;
 930         case IANA_AFI_IPV6:
 931             addr_chars = v6addr_chars;
 932             break;
 933         }
 934
 935         length = length_from_afi(afi);
 936
 937         /*
 938          * Handle SAFI, if any, and OPENSSL_strdup() so we can null-terminate
 939          * the other input values.
 940          */
 941         if (safi != NULL) {
 942             *safi = strtoul(val->value, &t, 0);
 943             t += strspn(t, " \t");
 944             if (*safi > 0xFF || *t++ != ':') {
 945                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, X509V3_R_INVALID_SAFI);
 946                 X509V3_conf_err(val);
 947                 goto err;
 948             }
 949             t += strspn(t, " \t");
 950             s = OPENSSL_strdup(t);
 951         } else {
 952             s = OPENSSL_strdup(val->value);
 953         }
 954         if (s == NULL) {
 955             X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
 956             goto err;
 957         }
 958
 959         /*
 960          * Check for inheritance.  Not worth additional complexity to
 961          * optimize this (seldom-used) case.
 962          */
 963         if (strcmp(s, "inherit") == 0) {
 964             if (!X509v3_addr_add_inherit(addr, afi, safi)) {
 965                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
 966                           X509V3_R_INVALID_INHERITANCE);
 967                 X509V3_conf_err(val);
 968                 goto err;
 969             }
 970             OPENSSL_free(s);
 971             s = NULL;
 972             continue;
 973         }
 974
 975         i1 = strspn(s, addr_chars);
 976         i2 = i1 + strspn(s + i1, " \t");
 977         delim = s[i2++];
 978         s[i1] = '\0';
 979
 980         if (a2i_ipadd(min, s) != length) {
 981             X509V3err(X509V3_F_V2I_IPADDRBLOCKS, X509V3_R_INVALID_IPADDRESS);
 982             X509V3_conf_err(val);
 983             goto err;
 984         }
 985
 986         switch (delim) {
 987         case '/':
 988             prefixlen = (int)strtoul(s + i2, &t, 10);
 989             if (t == s + i2 || *t != '\0') {
 990                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
 991                           X509V3_R_EXTENSION_VALUE_ERROR);
 992                 X509V3_conf_err(val);
 993                 goto err;
 994             }
 995             if (!X509v3_addr_add_prefix(addr, afi, safi, min, prefixlen)) {
 996                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
 997                 goto err;
 998             }
 999             break;
1000         case '-':
1001             i1 = i2 + strspn(s + i2, " \t");
1002             i2 = i1 + strspn(s + i1, addr_chars);
1003             if (i1 == i2 || s[i2] != '\0') {
1004                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1005                           X509V3_R_EXTENSION_VALUE_ERROR);
1006                 X509V3_conf_err(val);
1007                 goto err;
1008             }
1009             if (a2i_ipadd(max, s + i1) != length) {
1010                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1011                           X509V3_R_INVALID_IPADDRESS);
1012                 X509V3_conf_err(val);
1013                 goto err;
1014             }
1015             if (memcmp(min, max, length_from_afi(afi)) > 0) {
1016                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1017                           X509V3_R_EXTENSION_VALUE_ERROR);
1018                 X509V3_conf_err(val);
1019                 goto err;
1020             }
1021             if (!X509v3_addr_add_range(addr, afi, safi, min, max)) {
1022                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
1023                 goto err;
1024             }
1025             break;
1026         case '\0':
1027             if (!X509v3_addr_add_prefix(addr, afi, safi, min, length * 8)) {
1028                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
1029                 goto err;
1030             }
1031             break;
1032         default:
1033             X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1034                       X509V3_R_EXTENSION_VALUE_ERROR);
1035             X509V3_conf_err(val);
1036             goto err;
1037         }
1038
1039         OPENSSL_free(s);
1040         s = NULL;
1041     }
1042
1043     /*
1044      * Canonize the result, then we're done.
1045      */
1046     if (!X509v3_addr_canonize(addr))
1047         goto err;
1048     return addr;
1049
1050  err:
1051     OPENSSL_free(s);
1052     sk_IPAddressFamily_pop_free(addr, IPAddressFamily_free);
1053     return NULL;
1054 }
1055
1056 /*
1057  * OpenSSL dispatch
1058  */
1059 const X509V3_EXT_METHOD v3_addr = {
1060     NID_sbgp_ipAddrBlock,       /* nid */
1061     0,                          /* flags */
1062     ASN1_ITEM_ref(IPAddrBlocks), /* template */
1063     0, 0, 0, 0,                 /* old functions, ignored */
1064     0,                          /* i2s */
1065     0,                          /* s2i */
1066     0,                          /* i2v */
1067     v2i_IPAddrBlocks,           /* v2i */
1068     i2r_IPAddrBlocks,           /* i2r */
1069     0,                          /* r2i */
1070     NULL                        /* extension-specific data */
1071 };
1072
1073 /*
1074  * Figure out whether extension sues inheritance.
1075  */
1076 int X509v3_addr_inherits(IPAddrBlocks *addr)
1077 {
1078     int i;
1079     if (addr == NULL)
1080         return 0;
1081     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
1082         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
1083         if (f->ipAddressChoice->type == IPAddressChoice_inherit)
1084             return 1;
1085     }
1086     return 0;
1087 }
1088
1089 /*
1090  * Figure out whether parent contains child.
1091  */
1092 static int addr_contains(IPAddressOrRanges *parent,
1093                          IPAddressOrRanges *child, int length)
1094 {
1095     unsigned char p_min[ADDR_RAW_BUF_LEN], p_max[ADDR_RAW_BUF_LEN];
1096     unsigned char c_min[ADDR_RAW_BUF_LEN], c_max[ADDR_RAW_BUF_LEN];
1097     int p, c;
1098
1099     if (child == NULL || parent == child)
1100         return 1;
1101     if (parent == NULL)
1102         return 0;
1103
1104     p = 0;
1105     for (c = 0; c < sk_IPAddressOrRange_num(child); c++) {
1106         if (!extract_min_max(sk_IPAddressOrRange_value(child, c),
1107                              c_min, c_max, length))
1108             return -1;
1109         for (;; p++) {
1110             if (p >= sk_IPAddressOrRange_num(parent))
1111                 return 0;
1112             if (!extract_min_max(sk_IPAddressOrRange_value(parent, p),
1113                                  p_min, p_max, length))
1114                 return 0;
1115             if (memcmp(p_max, c_max, length) < 0)
1116                 continue;
1117             if (memcmp(p_min, c_min, length) > 0)
1118                 return 0;
1119             break;
1120         }
1121     }
1122
1123     return 1;
1124 }
1125
1126 /*
1127  * Test whether a is a subset of b.
1128  */
1129 int X509v3_addr_subset(IPAddrBlocks *a, IPAddrBlocks *b)
1130 {
1131     int i;
1132     if (a == NULL || a == b)
1133         return 1;
1134     if (b == NULL || X509v3_addr_inherits(a) || X509v3_addr_inherits(b))
1135         return 0;
1136     (void)sk_IPAddressFamily_set_cmp_func(b, IPAddressFamily_cmp);
1137     for (i = 0; i < sk_IPAddressFamily_num(a); i++) {
1138         IPAddressFamily *fa = sk_IPAddressFamily_value(a, i);
1139         int j = sk_IPAddressFamily_find(b, fa);
1140         IPAddressFamily *fb;
1141         fb = sk_IPAddressFamily_value(b, j);
1142         if (fb == NULL)
1143             return 0;
1144         if (!addr_contains(fb->ipAddressChoice->u.addressesOrRanges,
1145                            fa->ipAddressChoice->u.addressesOrRanges,
1146                            length_from_afi(X509v3_addr_get_afi(fb))))
1147             return 0;
1148     }
1149     return 1;
1150 }
1151
1152 /*
1153  * Validation error handling via callback.
1154  */
1155 #define validation_err(_err_)           \
1156   do {                                  \
1157     if (ctx != NULL) {                  \
1158       ctx->error = _err_;               \
1159       ctx->error_depth = i;             \
1160       ctx->current_cert = x;            \
1161       ret = ctx->verify_cb(0, ctx);     \
1162     } else {                            \
1163       ret = 0;                          \
1164     }                                   \
1165     if (!ret)                           \
1166       goto done;                        \
1167   } while (0)
1168
1169 /*
1170  * Core code for RFC 3779 2.3 path validation.
1171  *
1172  * Returns 1 for success, 0 on error.
1173  *
1174  * When returning 0, ctx->error MUST be set to an appropriate value other than
1175  * X509_V_OK.
1176  */
1177 static int addr_validate_path_internal(X509_STORE_CTX *ctx,
1178                                        STACK_OF(X509) *chain,
1179                                        IPAddrBlocks *ext)
1180 {
1181     IPAddrBlocks *child = NULL;
1182     int i, j, ret = 1;
1183     X509 *x;
1184
1185     OPENSSL_assert(chain != NULL && sk_X509_num(chain) > 0);
1186     OPENSSL_assert(ctx != NULL || ext != NULL);
1187     OPENSSL_assert(ctx == NULL || ctx->verify_cb != NULL);
1188
1189     /*
1190      * Figure out where to start.  If we don't have an extension to
1191      * check, we're done.  Otherwise, check canonical form and
1192      * set up for walking up the chain.
1193      */
1194     if (ext != NULL) {
1195         i = -1;
1196         x = NULL;
1197     } else {
1198         i = 0;
1199         x = sk_X509_value(chain, i);
1200         OPENSSL_assert(x != NULL);
1201         if ((ext = x->rfc3779_addr) == NULL)
1202             goto done;
1203     }
1204     if (!X509v3_addr_is_canonical(ext))
1205         validation_err(X509_V_ERR_INVALID_EXTENSION);
1206     (void)sk_IPAddressFamily_set_cmp_func(ext, IPAddressFamily_cmp);
1207     if ((child = sk_IPAddressFamily_dup(ext)) == NULL) {
1208         X509V3err(X509V3_F_ADDR_VALIDATE_PATH_INTERNAL,
1209                   ERR_R_MALLOC_FAILURE);
1210         ctx->error = X509_V_ERR_OUT_OF_MEM;
1211         ret = 0;
1212         goto done;
1213     }
1214
1215     /*
1216      * Now walk up the chain.  No cert may list resources that its
1217      * parent doesn't list.
1218      */
1219     for (i++; i < sk_X509_num(chain); i++) {
1220         x = sk_X509_value(chain, i);
1221         OPENSSL_assert(x != NULL);
1222         if (!X509v3_addr_is_canonical(x->rfc3779_addr))
1223             validation_err(X509_V_ERR_INVALID_EXTENSION);
1224         if (x->rfc3779_addr == NULL) {
1225             for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
1226                 IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
1227                 if (fc->ipAddressChoice->type != IPAddressChoice_inherit) {
1228                     validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1229                     break;
1230                 }
1231             }
1232             continue;
1233         }
1234         (void)sk_IPAddressFamily_set_cmp_func(x->rfc3779_addr,
1235                                               IPAddressFamily_cmp);
1236         for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
1237             IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
1238             int k = sk_IPAddressFamily_find(x->rfc3779_addr, fc);
1239             IPAddressFamily *fp =
1240                 sk_IPAddressFamily_value(x->rfc3779_addr, k);
1241             if (fp == NULL) {
1242                 if (fc->ipAddressChoice->type ==
1243                     IPAddressChoice_addressesOrRanges) {
1244                     validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1245                     break;
1246                 }
1247                 continue;
1248             }
1249             if (fp->ipAddressChoice->type ==
1250                 IPAddressChoice_addressesOrRanges) {
1251                 if (fc->ipAddressChoice->type == IPAddressChoice_inherit
1252                     || addr_contains(fp->ipAddressChoice->u.addressesOrRanges,
1253                                      fc->ipAddressChoice->u.addressesOrRanges,
1254                                      length_from_afi(X509v3_addr_get_afi(fc))))
1255                     sk_IPAddressFamily_set(child, j, fp);
1256                 else
1257                     validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1258             }
1259         }
1260     }
1261
1262     /*
1263      * Trust anchor can't inherit.
1264      */
1265     OPENSSL_assert(x != NULL);
1266     if (x->rfc3779_addr != NULL) {
1267         for (j = 0; j < sk_IPAddressFamily_num(x->rfc3779_addr); j++) {
1268             IPAddressFamily *fp =
1269                 sk_IPAddressFamily_value(x->rfc3779_addr, j);
1270             if (fp->ipAddressChoice->type == IPAddressChoice_inherit
1271                 && sk_IPAddressFamily_find(child, fp) >= 0)
1272                 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1273         }
1274     }
1275
1276  done:
1277     sk_IPAddressFamily_free(child);
1278     return ret;
1279 }
1280
1281 #undef validation_err
1282
1283 /*
1284  * RFC 3779 2.3 path validation -- called from X509_verify_cert().
1285  */
1286 int X509v3_addr_validate_path(X509_STORE_CTX *ctx)
1287 {
1288     return addr_validate_path_internal(ctx, ctx->chain, NULL);
1289 }
1290
1291 /*
1292  * RFC 3779 2.3 path validation of an extension.
1293  * Test whether chain covers extension.
1294  */
1295 int X509v3_addr_validate_resource_set(STACK_OF(X509) *chain,
1296                                   IPAddrBlocks *ext, int allow_inheritance)
1297 {
1298     if (ext == NULL)
1299         return 1;
1300     if (chain == NULL || sk_X509_num(chain) == 0)
1301         return 0;
1302     if (!allow_inheritance && X509v3_addr_inherits(ext))
1303         return 0;
1304     return addr_validate_path_internal(NULL, chain, ext);
1305 }
1306
1307 #endif                          /* OPENSSL_NO_RFC3779 */