crypto/x509/v3_addr.c

   1 /*
   2  * Copyright 2006-2022 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*
  11  * Implementation of RFC 3779 section 2.2.
  12  */
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <assert.h>
  17 #include <string.h>
  18
  19 #include "internal/cryptlib.h"
  20 #include <openssl/conf.h>
  21 #include <openssl/asn1.h>
  22 #include <openssl/asn1t.h>
  23 #include <openssl/buffer.h>
  24 #include <openssl/x509v3.h>
  25 #include "crypto/x509.h"
  26 #include "ext_dat.h"
  27 #include "x509_local.h"
  28
  29 #ifndef OPENSSL_NO_RFC3779
  30
  31 /*
  32  * OpenSSL ASN.1 template translation of RFC 3779 2.2.3.
  33  */
  34
  35 ASN1_SEQUENCE(IPAddressRange) = {
  36   ASN1_SIMPLE(IPAddressRange, min, ASN1_BIT_STRING),
  37   ASN1_SIMPLE(IPAddressRange, max, ASN1_BIT_STRING)
  38 } ASN1_SEQUENCE_END(IPAddressRange)
  39
  40 ASN1_CHOICE(IPAddressOrRange) = {
  41   ASN1_SIMPLE(IPAddressOrRange, u.addressPrefix, ASN1_BIT_STRING),
  42   ASN1_SIMPLE(IPAddressOrRange, u.addressRange,  IPAddressRange)
  43 } ASN1_CHOICE_END(IPAddressOrRange)
  44
  45 ASN1_CHOICE(IPAddressChoice) = {
  46   ASN1_SIMPLE(IPAddressChoice,      u.inherit,           ASN1_NULL),
  47   ASN1_SEQUENCE_OF(IPAddressChoice, u.addressesOrRanges, IPAddressOrRange)
  48 } ASN1_CHOICE_END(IPAddressChoice)
  49
  50 ASN1_SEQUENCE(IPAddressFamily) = {
  51   ASN1_SIMPLE(IPAddressFamily, addressFamily,   ASN1_OCTET_STRING),
  52   ASN1_SIMPLE(IPAddressFamily, ipAddressChoice, IPAddressChoice)
  53 } ASN1_SEQUENCE_END(IPAddressFamily)
  54
  55 ASN1_ITEM_TEMPLATE(IPAddrBlocks) =
  56   ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0,
  57                         IPAddrBlocks, IPAddressFamily)
  58 static_ASN1_ITEM_TEMPLATE_END(IPAddrBlocks)
  59
  60 IMPLEMENT_ASN1_FUNCTIONS(IPAddressRange)
  61 IMPLEMENT_ASN1_FUNCTIONS(IPAddressOrRange)
  62 IMPLEMENT_ASN1_FUNCTIONS(IPAddressChoice)
  63 IMPLEMENT_ASN1_FUNCTIONS(IPAddressFamily)
  64
  65 /*
  66  * How much buffer space do we need for a raw address?
  67  */
  68 #define ADDR_RAW_BUF_LEN        16
  69
  70 /*
  71  * What's the address length associated with this AFI?
  72  */
  73 static int length_from_afi(const unsigned afi)
  74 {
  75     switch (afi) {
  76     case IANA_AFI_IPV4:
  77         return 4;
  78     case IANA_AFI_IPV6:
  79         return 16;
  80     default:
  81         return 0;
  82     }
  83 }
  84
  85 /*
  86  * Extract the AFI from an IPAddressFamily.
  87  */
  88 unsigned int X509v3_addr_get_afi(const IPAddressFamily *f)
  89 {
  90     if (f == NULL
  91             || f->addressFamily == NULL
  92             || f->addressFamily->data == NULL
  93             || f->addressFamily->length < 2)
  94         return 0;
  95     return (f->addressFamily->data[0] << 8) | f->addressFamily->data[1];
  96 }
  97
  98 /*
  99  * Expand the bitstring form of an address into a raw byte array.
 100  * At the moment this is coded for simplicity, not speed.
 101  */
 102 static int addr_expand(unsigned char *addr,
 103                        const ASN1_BIT_STRING *bs,
 104                        const int length, const unsigned char fill)
 105 {
 106     if (bs->length < 0 || bs->length > length)
 107         return 0;
 108     if (bs->length > 0) {
 109         memcpy(addr, bs->data, bs->length);
 110         if ((bs->flags & 7) != 0) {
 111             unsigned char mask = 0xFF >> (8 - (bs->flags & 7));
 112             if (fill == 0)
 113                 addr[bs->length - 1] &= ~mask;
 114             else
 115                 addr[bs->length - 1] |= mask;
 116         }
 117     }
 118     memset(addr + bs->length, fill, length - bs->length);
 119     return 1;
 120 }
 121
 122 /*
 123  * Extract the prefix length from a bitstring.
 124  */
 125 #define addr_prefixlen(bs) ((int) ((bs)->length * 8 - ((bs)->flags & 7)))
 126
 127 /*
 128  * i2r handler for one address bitstring.
 129  */
 130 static int i2r_address(BIO *out,
 131                        const unsigned afi,
 132                        const unsigned char fill, const ASN1_BIT_STRING *bs)
 133 {
 134     unsigned char addr[ADDR_RAW_BUF_LEN];
 135     int i, n;
 136
 137     if (bs->length < 0)
 138         return 0;
 139     switch (afi) {
 140     case IANA_AFI_IPV4:
 141         if (!addr_expand(addr, bs, 4, fill))
 142             return 0;
 143         BIO_printf(out, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
 144         break;
 145     case IANA_AFI_IPV6:
 146         if (!addr_expand(addr, bs, 16, fill))
 147             return 0;
 148         for (n = 16; n > 1 && addr[n - 1] == 0x00 && addr[n - 2] == 0x00;
 149              n -= 2) ;
 150         for (i = 0; i < n; i += 2)
 151             BIO_printf(out, "%x%s", (addr[i] << 8) | addr[i + 1],
 152                        (i < 14 ? ":" : ""));
 153         if (i < 16)
 154             BIO_puts(out, ":");
 155         if (i == 0)
 156             BIO_puts(out, ":");
 157         break;
 158     default:
 159         for (i = 0; i < bs->length; i++)
 160             BIO_printf(out, "%s%02x", (i > 0 ? ":" : ""), bs->data[i]);
 161         BIO_printf(out, "[%d]", (int)(bs->flags & 7));
 162         break;
 163     }
 164     return 1;
 165 }
 166
 167 /*
 168  * i2r handler for a sequence of addresses and ranges.
 169  */
 170 static int i2r_IPAddressOrRanges(BIO *out,
 171                                  const int indent,
 172                                  const IPAddressOrRanges *aors,
 173                                  const unsigned afi)
 174 {
 175     int i;
 176     for (i = 0; i < sk_IPAddressOrRange_num(aors); i++) {
 177         const IPAddressOrRange *aor = sk_IPAddressOrRange_value(aors, i);
 178         BIO_printf(out, "%*s", indent, "");
 179         switch (aor->type) {
 180         case IPAddressOrRange_addressPrefix:
 181             if (!i2r_address(out, afi, 0x00, aor->u.addressPrefix))
 182                 return 0;
 183             BIO_printf(out, "/%d\n", addr_prefixlen(aor->u.addressPrefix));
 184             continue;
 185         case IPAddressOrRange_addressRange:
 186             if (!i2r_address(out, afi, 0x00, aor->u.addressRange->min))
 187                 return 0;
 188             BIO_puts(out, "-");
 189             if (!i2r_address(out, afi, 0xFF, aor->u.addressRange->max))
 190                 return 0;
 191             BIO_puts(out, "\n");
 192             continue;
 193         }
 194     }
 195     return 1;
 196 }
 197
 198 /*
 199  * i2r handler for an IPAddrBlocks extension.
 200  */
 201 static int i2r_IPAddrBlocks(const X509V3_EXT_METHOD *method,
 202                             void *ext, BIO *out, int indent)
 203 {
 204     const IPAddrBlocks *addr = ext;
 205     int i;
 206     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 207         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
 208         const unsigned int afi = X509v3_addr_get_afi(f);
 209         switch (afi) {
 210         case IANA_AFI_IPV4:
 211             BIO_printf(out, "%*sIPv4", indent, "");
 212             break;
 213         case IANA_AFI_IPV6:
 214             BIO_printf(out, "%*sIPv6", indent, "");
 215             break;
 216         default:
 217             BIO_printf(out, "%*sUnknown AFI %u", indent, "", afi);
 218             break;
 219         }
 220         if (f->addressFamily->length > 2) {
 221             switch (f->addressFamily->data[2]) {
 222             case 1:
 223                 BIO_puts(out, " (Unicast)");
 224                 break;
 225             case 2:
 226                 BIO_puts(out, " (Multicast)");
 227                 break;
 228             case 3:
 229                 BIO_puts(out, " (Unicast/Multicast)");
 230                 break;
 231             case 4:
 232                 BIO_puts(out, " (MPLS)");
 233                 break;
 234             case 64:
 235                 BIO_puts(out, " (Tunnel)");
 236                 break;
 237             case 65:
 238                 BIO_puts(out, " (VPLS)");
 239                 break;
 240             case 66:
 241                 BIO_puts(out, " (BGP MDT)");
 242                 break;
 243             case 128:
 244                 BIO_puts(out, " (MPLS-labeled VPN)");
 245                 break;
 246             default:
 247                 BIO_printf(out, " (Unknown SAFI %u)",
 248                            (unsigned)f->addressFamily->data[2]);
 249                 break;
 250             }
 251         }
 252         switch (f->ipAddressChoice->type) {
 253         case IPAddressChoice_inherit:
 254             BIO_puts(out, ": inherit\n");
 255             break;
 256         case IPAddressChoice_addressesOrRanges:
 257             BIO_puts(out, ":\n");
 258             if (!i2r_IPAddressOrRanges(out,
 259                                        indent + 2,
 260                                        f->ipAddressChoice->
 261                                        u.addressesOrRanges, afi))
 262                 return 0;
 263             break;
 264         }
 265     }
 266     return 1;
 267 }
 268
 269 /*
 270  * Sort comparison function for a sequence of IPAddressOrRange
 271  * elements.
 272  *
 273  * There's no sane answer we can give if addr_expand() fails, and an
 274  * assertion failure on externally supplied data is seriously uncool,
 275  * so we just arbitrarily declare that if given invalid inputs this
 276  * function returns -1.  If this messes up your preferred sort order
 277  * for garbage input, tough noogies.
 278  */
 279 static int IPAddressOrRange_cmp(const IPAddressOrRange *a,
 280                                 const IPAddressOrRange *b, const int length)
 281 {
 282     unsigned char addr_a[ADDR_RAW_BUF_LEN], addr_b[ADDR_RAW_BUF_LEN];
 283     int prefixlen_a = 0, prefixlen_b = 0;
 284     int r;
 285
 286     switch (a->type) {
 287     case IPAddressOrRange_addressPrefix:
 288         if (!addr_expand(addr_a, a->u.addressPrefix, length, 0x00))
 289             return -1;
 290         prefixlen_a = addr_prefixlen(a->u.addressPrefix);
 291         break;
 292     case IPAddressOrRange_addressRange:
 293         if (!addr_expand(addr_a, a->u.addressRange->min, length, 0x00))
 294             return -1;
 295         prefixlen_a = length * 8;
 296         break;
 297     }
 298
 299     switch (b->type) {
 300     case IPAddressOrRange_addressPrefix:
 301         if (!addr_expand(addr_b, b->u.addressPrefix, length, 0x00))
 302             return -1;
 303         prefixlen_b = addr_prefixlen(b->u.addressPrefix);
 304         break;
 305     case IPAddressOrRange_addressRange:
 306         if (!addr_expand(addr_b, b->u.addressRange->min, length, 0x00))
 307             return -1;
 308         prefixlen_b = length * 8;
 309         break;
 310     }
 311
 312     if ((r = memcmp(addr_a, addr_b, length)) != 0)
 313         return r;
 314     else
 315         return prefixlen_a - prefixlen_b;
 316 }
 317
 318 /*
 319  * IPv4-specific closure over IPAddressOrRange_cmp, since sk_sort()
 320  * comparison routines are only allowed two arguments.
 321  */
 322 static int v4IPAddressOrRange_cmp(const IPAddressOrRange *const *a,
 323                                   const IPAddressOrRange *const *b)
 324 {
 325     return IPAddressOrRange_cmp(*a, *b, 4);
 326 }
 327
 328 /*
 329  * IPv6-specific closure over IPAddressOrRange_cmp, since sk_sort()
 330  * comparison routines are only allowed two arguments.
 331  */
 332 static int v6IPAddressOrRange_cmp(const IPAddressOrRange *const *a,
 333                                   const IPAddressOrRange *const *b)
 334 {
 335     return IPAddressOrRange_cmp(*a, *b, 16);
 336 }
 337
 338 /*
 339  * Calculate whether a range collapses to a prefix.
 340  * See last paragraph of RFC 3779 2.2.3.7.
 341  */
 342 static int range_should_be_prefix(const unsigned char *min,
 343                                   const unsigned char *max, const int length)
 344 {
 345     unsigned char mask;
 346     int i, j;
 347
 348     /*
 349      * It is the responsibility of the caller to confirm min <= max. We don't
 350      * use ossl_assert() here since we have no way of signalling an error from
 351      * this function - so we just use a plain assert instead.
 352      */
 353     assert(memcmp(min, max, length) <= 0);
 354
 355     for (i = 0; i < length && min[i] == max[i]; i++) ;
 356     for (j = length - 1; j >= 0 && min[j] == 0x00 && max[j] == 0xFF; j--) ;
 357     if (i < j)
 358         return -1;
 359     if (i > j)
 360         return i * 8;
 361     mask = min[i] ^ max[i];
 362     switch (mask) {
 363     case 0x01:
 364         j = 7;
 365         break;
 366     case 0x03:
 367         j = 6;
 368         break;
 369     case 0x07:
 370         j = 5;
 371         break;
 372     case 0x0F:
 373         j = 4;
 374         break;
 375     case 0x1F:
 376         j = 3;
 377         break;
 378     case 0x3F:
 379         j = 2;
 380         break;
 381     case 0x7F:
 382         j = 1;
 383         break;
 384     default:
 385         return -1;
 386     }
 387     if ((min[i] & mask) != 0 || (max[i] & mask) != mask)
 388         return -1;
 389     else
 390         return i * 8 + j;
 391 }
 392
 393 /*
 394  * Construct a prefix.
 395  */
 396 static int make_addressPrefix(IPAddressOrRange **result,
 397                               unsigned char *addr, const int prefixlen)
 398 {
 399     int bytelen = (prefixlen + 7) / 8, bitlen = prefixlen % 8;
 400     IPAddressOrRange *aor = IPAddressOrRange_new();
 401
 402     if (aor == NULL)
 403         return 0;
 404     aor->type = IPAddressOrRange_addressPrefix;
 405     if (aor->u.addressPrefix == NULL &&
 406         (aor->u.addressPrefix = ASN1_BIT_STRING_new()) == NULL)
 407         goto err;
 408     if (!ASN1_BIT_STRING_set(aor->u.addressPrefix, addr, bytelen))
 409         goto err;
 410     aor->u.addressPrefix->flags &= ~7;
 411     aor->u.addressPrefix->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 412     if (bitlen > 0) {
 413         aor->u.addressPrefix->data[bytelen - 1] &= ~(0xFF >> bitlen);
 414         aor->u.addressPrefix->flags |= 8 - bitlen;
 415     }
 416
 417     *result = aor;
 418     return 1;
 419
 420  err:
 421     IPAddressOrRange_free(aor);
 422     return 0;
 423 }
 424
 425 /*
 426  * Construct a range.  If it can be expressed as a prefix,
 427  * return a prefix instead.  Doing this here simplifies
 428  * the rest of the code considerably.
 429  */
 430 static int make_addressRange(IPAddressOrRange **result,
 431                              unsigned char *min,
 432                              unsigned char *max, const int length)
 433 {
 434     IPAddressOrRange *aor;
 435     int i, prefixlen;
 436
 437     if (memcmp(min, max, length) > 0)
 438         return 0;
 439
 440     if ((prefixlen = range_should_be_prefix(min, max, length)) >= 0)
 441         return make_addressPrefix(result, min, prefixlen);
 442
 443     if ((aor = IPAddressOrRange_new()) == NULL)
 444         return 0;
 445     aor->type = IPAddressOrRange_addressRange;
 446     if ((aor->u.addressRange = IPAddressRange_new()) == NULL)
 447         goto err;
 448     if (aor->u.addressRange->min == NULL &&
 449         (aor->u.addressRange->min = ASN1_BIT_STRING_new()) == NULL)
 450         goto err;
 451     if (aor->u.addressRange->max == NULL &&
 452         (aor->u.addressRange->max = ASN1_BIT_STRING_new()) == NULL)
 453         goto err;
 454
 455     for (i = length; i > 0 && min[i - 1] == 0x00; --i) ;
 456     if (!ASN1_BIT_STRING_set(aor->u.addressRange->min, min, i))
 457         goto err;
 458     aor->u.addressRange->min->flags &= ~7;
 459     aor->u.addressRange->min->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 460     if (i > 0) {
 461         unsigned char b = min[i - 1];
 462         int j = 1;
 463         while ((b & (0xFFU >> j)) != 0)
 464             ++j;
 465         aor->u.addressRange->min->flags |= 8 - j;
 466     }
 467
 468     for (i = length; i > 0 && max[i - 1] == 0xFF; --i) ;
 469     if (!ASN1_BIT_STRING_set(aor->u.addressRange->max, max, i))
 470         goto err;
 471     aor->u.addressRange->max->flags &= ~7;
 472     aor->u.addressRange->max->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 473     if (i > 0) {
 474         unsigned char b = max[i - 1];
 475         int j = 1;
 476         while ((b & (0xFFU >> j)) != (0xFFU >> j))
 477             ++j;
 478         aor->u.addressRange->max->flags |= 8 - j;
 479     }
 480
 481     *result = aor;
 482     return 1;
 483
 484  err:
 485     IPAddressOrRange_free(aor);
 486     return 0;
 487 }
 488
 489 /*
 490  * Construct a new address family or find an existing one.
 491  */
 492 static IPAddressFamily *make_IPAddressFamily(IPAddrBlocks *addr,
 493                                              const unsigned afi,
 494                                              const unsigned *safi)
 495 {
 496     IPAddressFamily *f;
 497     unsigned char key[3];
 498     int keylen;
 499     int i;
 500
 501     key[0] = (afi >> 8) & 0xFF;
 502     key[1] = afi & 0xFF;
 503     if (safi != NULL) {
 504         key[2] = *safi & 0xFF;
 505         keylen = 3;
 506     } else {
 507         keylen = 2;
 508     }
 509
 510     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 511         f = sk_IPAddressFamily_value(addr, i);
 512         if (f->addressFamily->length == keylen &&
 513             !memcmp(f->addressFamily->data, key, keylen))
 514             return f;
 515     }
 516
 517     if ((f = IPAddressFamily_new()) == NULL)
 518         goto err;
 519     if (f->ipAddressChoice == NULL &&
 520         (f->ipAddressChoice = IPAddressChoice_new()) == NULL)
 521         goto err;
 522     if (f->addressFamily == NULL &&
 523         (f->addressFamily = ASN1_OCTET_STRING_new()) == NULL)
 524         goto err;
 525     if (!ASN1_OCTET_STRING_set(f->addressFamily, key, keylen))
 526         goto err;
 527     if (!sk_IPAddressFamily_push(addr, f))
 528         goto err;
 529
 530     return f;
 531
 532  err:
 533     IPAddressFamily_free(f);
 534     return NULL;
 535 }
 536
 537 /*
 538  * Add an inheritance element.
 539  */
 540 int X509v3_addr_add_inherit(IPAddrBlocks *addr,
 541                             const unsigned afi, const unsigned *safi)
 542 {
 543     IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
 544     if (f == NULL ||
 545         f->ipAddressChoice == NULL ||
 546         (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
 547          f->ipAddressChoice->u.addressesOrRanges != NULL))
 548         return 0;
 549     if (f->ipAddressChoice->type == IPAddressChoice_inherit &&
 550         f->ipAddressChoice->u.inherit != NULL)
 551         return 1;
 552     if (f->ipAddressChoice->u.inherit == NULL &&
 553         (f->ipAddressChoice->u.inherit = ASN1_NULL_new()) == NULL)
 554         return 0;
 555     f->ipAddressChoice->type = IPAddressChoice_inherit;
 556     return 1;
 557 }
 558
 559 /*
 560  * Construct an IPAddressOrRange sequence, or return an existing one.
 561  */
 562 static IPAddressOrRanges *make_prefix_or_range(IPAddrBlocks *addr,
 563                                                const unsigned afi,
 564                                                const unsigned *safi)
 565 {
 566     IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
 567     IPAddressOrRanges *aors = NULL;
 568
 569     if (f == NULL ||
 570         f->ipAddressChoice == NULL ||
 571         (f->ipAddressChoice->type == IPAddressChoice_inherit &&
 572          f->ipAddressChoice->u.inherit != NULL))
 573         return NULL;
 574     if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges)
 575         aors = f->ipAddressChoice->u.addressesOrRanges;
 576     if (aors != NULL)
 577         return aors;
 578     if ((aors = sk_IPAddressOrRange_new_null()) == NULL)
 579         return NULL;
 580     switch (afi) {
 581     case IANA_AFI_IPV4:
 582         (void)sk_IPAddressOrRange_set_cmp_func(aors, v4IPAddressOrRange_cmp);
 583         break;
 584     case IANA_AFI_IPV6:
 585         (void)sk_IPAddressOrRange_set_cmp_func(aors, v6IPAddressOrRange_cmp);
 586         break;
 587     }
 588     f->ipAddressChoice->type = IPAddressChoice_addressesOrRanges;
 589     f->ipAddressChoice->u.addressesOrRanges = aors;
 590     return aors;
 591 }
 592
 593 /*
 594  * Add a prefix.
 595  */
 596 int X509v3_addr_add_prefix(IPAddrBlocks *addr,
 597                            const unsigned afi,
 598                            const unsigned *safi,
 599                            unsigned char *a, const int prefixlen)
 600 {
 601     IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
 602     IPAddressOrRange *aor;
 603     if (aors == NULL || !make_addressPrefix(&aor, a, prefixlen))
 604         return 0;
 605     if (sk_IPAddressOrRange_push(aors, aor))
 606         return 1;
 607     IPAddressOrRange_free(aor);
 608     return 0;
 609 }
 610
 611 /*
 612  * Add a range.
 613  */
 614 int X509v3_addr_add_range(IPAddrBlocks *addr,
 615                           const unsigned afi,
 616                           const unsigned *safi,
 617                           unsigned char *min, unsigned char *max)
 618 {
 619     IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
 620     IPAddressOrRange *aor;
 621     int length = length_from_afi(afi);
 622     if (aors == NULL)
 623         return 0;
 624     if (!make_addressRange(&aor, min, max, length))
 625         return 0;
 626     if (sk_IPAddressOrRange_push(aors, aor))
 627         return 1;
 628     IPAddressOrRange_free(aor);
 629     return 0;
 630 }
 631
 632 /*
 633  * Extract min and max values from an IPAddressOrRange.
 634  */
 635 static int extract_min_max(IPAddressOrRange *aor,
 636                            unsigned char *min, unsigned char *max, int length)
 637 {
 638     if (aor == NULL || min == NULL || max == NULL)
 639         return 0;
 640     switch (aor->type) {
 641     case IPAddressOrRange_addressPrefix:
 642         return (addr_expand(min, aor->u.addressPrefix, length, 0x00) &&
 643                 addr_expand(max, aor->u.addressPrefix, length, 0xFF));
 644     case IPAddressOrRange_addressRange:
 645         return (addr_expand(min, aor->u.addressRange->min, length, 0x00) &&
 646                 addr_expand(max, aor->u.addressRange->max, length, 0xFF));
 647     }
 648     return 0;
 649 }
 650
 651 /*
 652  * Public wrapper for extract_min_max().
 653  */
 654 int X509v3_addr_get_range(IPAddressOrRange *aor,
 655                           const unsigned afi,
 656                           unsigned char *min,
 657                           unsigned char *max, const int length)
 658 {
 659     int afi_length = length_from_afi(afi);
 660     if (aor == NULL || min == NULL || max == NULL ||
 661         afi_length == 0 || length < afi_length ||
 662         (aor->type != IPAddressOrRange_addressPrefix &&
 663          aor->type != IPAddressOrRange_addressRange) ||
 664         !extract_min_max(aor, min, max, afi_length))
 665         return 0;
 666
 667     return afi_length;
 668 }
 669
 670 /*
 671  * Sort comparison function for a sequence of IPAddressFamily.
 672  *
 673  * The last paragraph of RFC 3779 2.2.3.3 is slightly ambiguous about
 674  * the ordering: I can read it as meaning that IPv6 without a SAFI
 675  * comes before IPv4 with a SAFI, which seems pretty weird.  The
 676  * examples in appendix B suggest that the author intended the
 677  * null-SAFI rule to apply only within a single AFI, which is what I
 678  * would have expected and is what the following code implements.
 679  */
 680 static int IPAddressFamily_cmp(const IPAddressFamily *const *a_,
 681                                const IPAddressFamily *const *b_)
 682 {
 683     const ASN1_OCTET_STRING *a = (*a_)->addressFamily;
 684     const ASN1_OCTET_STRING *b = (*b_)->addressFamily;
 685     int len = ((a->length <= b->length) ? a->length : b->length);
 686     int cmp = memcmp(a->data, b->data, len);
 687     return cmp ? cmp : a->length - b->length;
 688 }
 689
 690 /*
 691  * Check whether an IPAddrBLocks is in canonical form.
 692  */
 693 int X509v3_addr_is_canonical(IPAddrBlocks *addr)
 694 {
 695     unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
 696     unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
 697     IPAddressOrRanges *aors;
 698     int i, j, k;
 699
 700     /*
 701      * Empty extension is canonical.
 702      */
 703     if (addr == NULL)
 704         return 1;
 705
 706     /*
 707      * Check whether the top-level list is in order.
 708      */
 709     for (i = 0; i < sk_IPAddressFamily_num(addr) - 1; i++) {
 710         const IPAddressFamily *a = sk_IPAddressFamily_value(addr, i);
 711         const IPAddressFamily *b = sk_IPAddressFamily_value(addr, i + 1);
 712         if (IPAddressFamily_cmp(&a, &b) >= 0)
 713             return 0;
 714     }
 715
 716     /*
 717      * Top level's ok, now check each address family.
 718      */
 719     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 720         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
 721         int length = length_from_afi(X509v3_addr_get_afi(f));
 722
 723         /*
 724          * Inheritance is canonical.  Anything other than inheritance or
 725          * a SEQUENCE OF IPAddressOrRange is an ASN.1 error or something.
 726          */
 727         if (f == NULL || f->ipAddressChoice == NULL)
 728             return 0;
 729         switch (f->ipAddressChoice->type) {
 730         case IPAddressChoice_inherit:
 731             continue;
 732         case IPAddressChoice_addressesOrRanges:
 733             break;
 734         default:
 735             return 0;
 736         }
 737
 738         /*
 739          * It's an IPAddressOrRanges sequence, check it.
 740          */
 741         aors = f->ipAddressChoice->u.addressesOrRanges;
 742         if (sk_IPAddressOrRange_num(aors) == 0)
 743             return 0;
 744         for (j = 0; j < sk_IPAddressOrRange_num(aors) - 1; j++) {
 745             IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
 746             IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, j + 1);
 747
 748             if (!extract_min_max(a, a_min, a_max, length) ||
 749                 !extract_min_max(b, b_min, b_max, length))
 750                 return 0;
 751
 752             /*
 753              * Punt misordered list, overlapping start, or inverted range.
 754              */
 755             if (memcmp(a_min, b_min, length) >= 0 ||
 756                 memcmp(a_min, a_max, length) > 0 ||
 757                 memcmp(b_min, b_max, length) > 0)
 758                 return 0;
 759
 760             /*
 761              * Punt if adjacent or overlapping.  Check for adjacency by
 762              * subtracting one from b_min first.
 763              */
 764             for (k = length - 1; k >= 0 && b_min[k]-- == 0x00; k--) ;
 765             if (memcmp(a_max, b_min, length) >= 0)
 766                 return 0;
 767
 768             /*
 769              * Check for range that should be expressed as a prefix.
 770              */
 771             if (a->type == IPAddressOrRange_addressRange &&
 772                 range_should_be_prefix(a_min, a_max, length) >= 0)
 773                 return 0;
 774         }
 775
 776         /*
 777          * Check range to see if it's inverted or should be a
 778          * prefix.
 779          */
 780         j = sk_IPAddressOrRange_num(aors) - 1;
 781         {
 782             IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
 783             if (a != NULL && a->type == IPAddressOrRange_addressRange) {
 784                 if (!extract_min_max(a, a_min, a_max, length))
 785                     return 0;
 786                 if (memcmp(a_min, a_max, length) > 0 ||
 787                     range_should_be_prefix(a_min, a_max, length) >= 0)
 788                     return 0;
 789             }
 790         }
 791     }
 792
 793     /*
 794      * If we made it through all that, we're happy.
 795      */
 796     return 1;
 797 }
 798
 799 /*
 800  * Whack an IPAddressOrRanges into canonical form.
 801  */
 802 static int IPAddressOrRanges_canonize(IPAddressOrRanges *aors,
 803                                       const unsigned afi)
 804 {
 805     int i, j, length = length_from_afi(afi);
 806
 807     /*
 808      * Sort the IPAddressOrRanges sequence.
 809      */
 810     sk_IPAddressOrRange_sort(aors);
 811
 812     /*
 813      * Clean up representation issues, punt on duplicates or overlaps.
 814      */
 815     for (i = 0; i < sk_IPAddressOrRange_num(aors) - 1; i++) {
 816         IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, i);
 817         IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, i + 1);
 818         unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
 819         unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
 820
 821         if (!extract_min_max(a, a_min, a_max, length) ||
 822             !extract_min_max(b, b_min, b_max, length))
 823             return 0;
 824
 825         /*
 826          * Punt inverted ranges.
 827          */
 828         if (memcmp(a_min, a_max, length) > 0 ||
 829             memcmp(b_min, b_max, length) > 0)
 830             return 0;
 831
 832         /*
 833          * Punt overlaps.
 834          */
 835         if (memcmp(a_max, b_min, length) >= 0)
 836             return 0;
 837
 838         /*
 839          * Merge if a and b are adjacent.  We check for
 840          * adjacency by subtracting one from b_min first.
 841          */
 842         for (j = length - 1; j >= 0 && b_min[j]-- == 0x00; j--) ;
 843         if (memcmp(a_max, b_min, length) == 0) {
 844             IPAddressOrRange *merged;
 845             if (!make_addressRange(&merged, a_min, b_max, length))
 846                 return 0;
 847             (void)sk_IPAddressOrRange_set(aors, i, merged);
 848             (void)sk_IPAddressOrRange_delete(aors, i + 1);
 849             IPAddressOrRange_free(a);
 850             IPAddressOrRange_free(b);
 851             --i;
 852             continue;
 853         }
 854     }
 855
 856     /*
 857      * Check for inverted final range.
 858      */
 859     j = sk_IPAddressOrRange_num(aors) - 1;
 860     {
 861         IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
 862         if (a != NULL && a->type == IPAddressOrRange_addressRange) {
 863             unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
 864             if (!extract_min_max(a, a_min, a_max, length))
 865                 return 0;
 866             if (memcmp(a_min, a_max, length) > 0)
 867                 return 0;
 868         }
 869     }
 870
 871     return 1;
 872 }
 873
 874 /*
 875  * Whack an IPAddrBlocks extension into canonical form.
 876  */
 877 int X509v3_addr_canonize(IPAddrBlocks *addr)
 878 {
 879     int i;
 880     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 881         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
 882         if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
 883             !IPAddressOrRanges_canonize(f->ipAddressChoice->
 884                                         u.addressesOrRanges,
 885                                         X509v3_addr_get_afi(f)))
 886             return 0;
 887     }
 888     (void)sk_IPAddressFamily_set_cmp_func(addr, IPAddressFamily_cmp);
 889     sk_IPAddressFamily_sort(addr);
 890     if (!ossl_assert(X509v3_addr_is_canonical(addr)))
 891         return 0;
 892     return 1;
 893 }
 894
 895 /*
 896  * v2i handler for the IPAddrBlocks extension.
 897  */
 898 static void *v2i_IPAddrBlocks(const struct v3_ext_method *method,
 899                               struct v3_ext_ctx *ctx,
 900                               STACK_OF(CONF_VALUE) *values)
 901 {
 902     static const char v4addr_chars[] = "0123456789.";
 903     static const char v6addr_chars[] = "0123456789.:abcdefABCDEF";
 904     IPAddrBlocks *addr = NULL;
 905     char *s = NULL, *t;
 906     int i;
 907
 908     if ((addr = sk_IPAddressFamily_new(IPAddressFamily_cmp)) == NULL) {
 909         ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
 910         return NULL;
 911     }
 912
 913     for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
 914         CONF_VALUE *val = sk_CONF_VALUE_value(values, i);
 915         unsigned char min[ADDR_RAW_BUF_LEN], max[ADDR_RAW_BUF_LEN];
 916         unsigned afi, *safi = NULL, safi_;
 917         const char *addr_chars = NULL;
 918         int prefixlen, i1, i2, delim, length;
 919
 920         if (!ossl_v3_name_cmp(val->name, "IPv4")) {
 921             afi = IANA_AFI_IPV4;
 922         } else if (!ossl_v3_name_cmp(val->name, "IPv6")) {
 923             afi = IANA_AFI_IPV6;
 924         } else if (!ossl_v3_name_cmp(val->name, "IPv4-SAFI")) {
 925             afi = IANA_AFI_IPV4;
 926             safi = &safi_;
 927         } else if (!ossl_v3_name_cmp(val->name, "IPv6-SAFI")) {
 928             afi = IANA_AFI_IPV6;
 929             safi = &safi_;
 930         } else {
 931             ERR_raise_data(ERR_LIB_X509V3, X509V3_R_EXTENSION_NAME_ERROR,
 932                            "%s", val->name);
 933             goto err;
 934         }
 935
 936         switch (afi) {
 937         case IANA_AFI_IPV4:
 938             addr_chars = v4addr_chars;
 939             break;
 940         case IANA_AFI_IPV6:
 941             addr_chars = v6addr_chars;
 942             break;
 943         }
 944
 945         length = length_from_afi(afi);
 946
 947         /*
 948          * Handle SAFI, if any, and OPENSSL_strdup() so we can null-terminate
 949          * the other input values.
 950          */
 951         if (safi != NULL) {
 952             *safi = strtoul(val->value, &t, 0);
 953             t += strspn(t, " \t");
 954             if (*safi > 0xFF || *t++ != ':') {
 955                 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_SAFI);
 956                 X509V3_conf_add_error_name_value(val);
 957                 goto err;
 958             }
 959             t += strspn(t, " \t");
 960             s = OPENSSL_strdup(t);
 961         } else {
 962             s = OPENSSL_strdup(val->value);
 963         }
 964         if (s == NULL) {
 965             ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
 966             goto err;
 967         }
 968
 969         /*
 970          * Check for inheritance.  Not worth additional complexity to
 971          * optimize this (seldom-used) case.
 972          */
 973         if (strcmp(s, "inherit") == 0) {
 974             if (!X509v3_addr_add_inherit(addr, afi, safi)) {
 975                 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_INHERITANCE);
 976                 X509V3_conf_add_error_name_value(val);
 977                 goto err;
 978             }
 979             OPENSSL_free(s);
 980             s = NULL;
 981             continue;
 982         }
 983
 984         i1 = strspn(s, addr_chars);
 985         i2 = i1 + strspn(s + i1, " \t");
 986         delim = s[i2++];
 987         s[i1] = '\0';
 988
 989         if (ossl_a2i_ipadd(min, s) != length) {
 990             ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_IPADDRESS);
 991             X509V3_conf_add_error_name_value(val);
 992             goto err;
 993         }
 994
 995         switch (delim) {
 996         case '/':
 997             prefixlen = (int)strtoul(s + i2, &t, 10);
 998             if (t == s + i2 || *t != '\0') {
 999                 ERR_raise(ERR_LIB_X509V3, X509V3_R_EXTENSION_VALUE_ERROR);
1000                 X509V3_conf_add_error_name_value(val);
1001                 goto err;
1002             }
1003             if (!X509v3_addr_add_prefix(addr, afi, safi, min, prefixlen)) {
1004                 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
1005                 goto err;
1006             }
1007             break;
1008         case '-':
1009             i1 = i2 + strspn(s + i2, " \t");
1010             i2 = i1 + strspn(s + i1, addr_chars);
1011             if (i1 == i2 || s[i2] != '\0') {
1012                 ERR_raise(ERR_LIB_X509V3, X509V3_R_EXTENSION_VALUE_ERROR);
1013                 X509V3_conf_add_error_name_value(val);
1014                 goto err;
1015             }
1016             if (ossl_a2i_ipadd(max, s + i1) != length) {
1017                 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_IPADDRESS);
1018                 X509V3_conf_add_error_name_value(val);
1019                 goto err;
1020             }
1021             if (memcmp(min, max, length_from_afi(afi)) > 0) {
1022                 ERR_raise(ERR_LIB_X509V3, X509V3_R_EXTENSION_VALUE_ERROR);
1023                 X509V3_conf_add_error_name_value(val);
1024                 goto err;
1025             }
1026             if (!X509v3_addr_add_range(addr, afi, safi, min, max)) {
1027                 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
1028                 goto err;
1029             }
1030             break;
1031         case '\0':
1032             if (!X509v3_addr_add_prefix(addr, afi, safi, min, length * 8)) {
1033                 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
1034                 goto err;
1035             }
1036             break;
1037         default:
1038             ERR_raise(ERR_LIB_X509V3, X509V3_R_EXTENSION_VALUE_ERROR);
1039             X509V3_conf_add_error_name_value(val);
1040             goto err;
1041         }
1042
1043         OPENSSL_free(s);
1044         s = NULL;
1045     }
1046
1047     /*
1048      * Canonize the result, then we're done.
1049      */
1050     if (!X509v3_addr_canonize(addr))
1051         goto err;
1052     return addr;
1053
1054  err:
1055     OPENSSL_free(s);
1056     sk_IPAddressFamily_pop_free(addr, IPAddressFamily_free);
1057     return NULL;
1058 }
1059
1060 /*
1061  * OpenSSL dispatch
1062  */
1063 const X509V3_EXT_METHOD ossl_v3_addr = {
1064     NID_sbgp_ipAddrBlock,       /* nid */
1065     0,                          /* flags */
1066     ASN1_ITEM_ref(IPAddrBlocks), /* template */
1067     0, 0, 0, 0,                 /* old functions, ignored */
1068     0,                          /* i2s */
1069     0,                          /* s2i */
1070     0,                          /* i2v */
1071     v2i_IPAddrBlocks,           /* v2i */
1072     i2r_IPAddrBlocks,           /* i2r */
1073     0,                          /* r2i */
1074     NULL                        /* extension-specific data */
1075 };
1076
1077 /*
1078  * Figure out whether extension sues inheritance.
1079  */
1080 int X509v3_addr_inherits(IPAddrBlocks *addr)
1081 {
1082     int i;
1083     if (addr == NULL)
1084         return 0;
1085     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
1086         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
1087         if (f->ipAddressChoice->type == IPAddressChoice_inherit)
1088             return 1;
1089     }
1090     return 0;
1091 }
1092
1093 /*
1094  * Figure out whether parent contains child.
1095  */
1096 static int addr_contains(IPAddressOrRanges *parent,
1097                          IPAddressOrRanges *child, int length)
1098 {
1099     unsigned char p_min[ADDR_RAW_BUF_LEN], p_max[ADDR_RAW_BUF_LEN];
1100     unsigned char c_min[ADDR_RAW_BUF_LEN], c_max[ADDR_RAW_BUF_LEN];
1101     int p, c;
1102
1103     if (child == NULL || parent == child)
1104         return 1;
1105     if (parent == NULL)
1106         return 0;
1107
1108     p = 0;
1109     for (c = 0; c < sk_IPAddressOrRange_num(child); c++) {
1110         if (!extract_min_max(sk_IPAddressOrRange_value(child, c),
1111                              c_min, c_max, length))
1112             return 0;
1113         for (;; p++) {
1114             if (p >= sk_IPAddressOrRange_num(parent))
1115                 return 0;
1116             if (!extract_min_max(sk_IPAddressOrRange_value(parent, p),
1117                                  p_min, p_max, length))
1118                 return 0;
1119             if (memcmp(p_max, c_max, length) < 0)
1120                 continue;
1121             if (memcmp(p_min, c_min, length) > 0)
1122                 return 0;
1123             break;
1124         }
1125     }
1126
1127     return 1;
1128 }
1129
1130 /*
1131  * Test whether a is a subset of b.
1132  */
1133 int X509v3_addr_subset(IPAddrBlocks *a, IPAddrBlocks *b)
1134 {
1135     int i;
1136     if (a == NULL || a == b)
1137         return 1;
1138     if (b == NULL || X509v3_addr_inherits(a) || X509v3_addr_inherits(b))
1139         return 0;
1140     (void)sk_IPAddressFamily_set_cmp_func(b, IPAddressFamily_cmp);
1141     for (i = 0; i < sk_IPAddressFamily_num(a); i++) {
1142         IPAddressFamily *fa = sk_IPAddressFamily_value(a, i);
1143         int j = sk_IPAddressFamily_find(b, fa);
1144         IPAddressFamily *fb;
1145         fb = sk_IPAddressFamily_value(b, j);
1146         if (fb == NULL)
1147             return 0;
1148         if (!addr_contains(fb->ipAddressChoice->u.addressesOrRanges,
1149                            fa->ipAddressChoice->u.addressesOrRanges,
1150                            length_from_afi(X509v3_addr_get_afi(fb))))
1151             return 0;
1152     }
1153     return 1;
1154 }
1155
1156 /*
1157  * Validation error handling via callback.
1158  */
1159 #define validation_err(_err_)           \
1160   do {                                  \
1161     if (ctx != NULL) {                  \
1162       ctx->error = _err_;               \
1163       ctx->error_depth = i;             \
1164       ctx->current_cert = x;            \
1165       ret = ctx->verify_cb(0, ctx);     \
1166     } else {                            \
1167       ret = 0;                          \
1168     }                                   \
1169     if (!ret)                           \
1170       goto done;                        \
1171   } while (0)
1172
1173 /*
1174  * Core code for RFC 3779 2.3 path validation.
1175  *
1176  * Returns 1 for success, 0 on error.
1177  *
1178  * When returning 0, ctx->error MUST be set to an appropriate value other than
1179  * X509_V_OK.
1180  */
1181 static int addr_validate_path_internal(X509_STORE_CTX *ctx,
1182                                        STACK_OF(X509) *chain,
1183                                        IPAddrBlocks *ext)
1184 {
1185     IPAddrBlocks *child = NULL;
1186     int i, j, ret = 1;
1187     X509 *x;
1188
1189     if (!ossl_assert(chain != NULL && sk_X509_num(chain) > 0)
1190             || !ossl_assert(ctx != NULL || ext != NULL)
1191             || !ossl_assert(ctx == NULL || ctx->verify_cb != NULL)) {
1192         if (ctx != NULL)
1193             ctx->error = X509_V_ERR_UNSPECIFIED;
1194         return 0;
1195     }
1196
1197     /*
1198      * Figure out where to start.  If we don't have an extension to
1199      * check, we're done.  Otherwise, check canonical form and
1200      * set up for walking up the chain.
1201      */
1202     if (ext != NULL) {
1203         i = -1;
1204         x = NULL;
1205     } else {
1206         i = 0;
1207         x = sk_X509_value(chain, i);
1208         if ((ext = x->rfc3779_addr) == NULL)
1209             goto done;
1210     }
1211     if (!X509v3_addr_is_canonical(ext))
1212         validation_err(X509_V_ERR_INVALID_EXTENSION);
1213     (void)sk_IPAddressFamily_set_cmp_func(ext, IPAddressFamily_cmp);
1214     if ((child = sk_IPAddressFamily_dup(ext)) == NULL) {
1215         ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
1216         if (ctx != NULL)
1217             ctx->error = X509_V_ERR_OUT_OF_MEM;
1218         ret = 0;
1219         goto done;
1220     }
1221
1222     /*
1223      * Now walk up the chain.  No cert may list resources that its
1224      * parent doesn't list.
1225      */
1226     for (i++; i < sk_X509_num(chain); i++) {
1227         x = sk_X509_value(chain, i);
1228         if (!X509v3_addr_is_canonical(x->rfc3779_addr))
1229             validation_err(X509_V_ERR_INVALID_EXTENSION);
1230         if (x->rfc3779_addr == NULL) {
1231             for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
1232                 IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
1233                 if (fc->ipAddressChoice->type != IPAddressChoice_inherit) {
1234                     validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1235                     break;
1236                 }
1237             }
1238             continue;
1239         }
1240         (void)sk_IPAddressFamily_set_cmp_func(x->rfc3779_addr,
1241                                               IPAddressFamily_cmp);
1242         for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
1243             IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
1244             int k = sk_IPAddressFamily_find(x->rfc3779_addr, fc);
1245             IPAddressFamily *fp =
1246                 sk_IPAddressFamily_value(x->rfc3779_addr, k);
1247             if (fp == NULL) {
1248                 if (fc->ipAddressChoice->type ==
1249                     IPAddressChoice_addressesOrRanges) {
1250                     validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1251                     break;
1252                 }
1253                 continue;
1254             }
1255             if (fp->ipAddressChoice->type ==
1256                 IPAddressChoice_addressesOrRanges) {
1257                 if (fc->ipAddressChoice->type == IPAddressChoice_inherit
1258                     || addr_contains(fp->ipAddressChoice->u.addressesOrRanges,
1259                                      fc->ipAddressChoice->u.addressesOrRanges,
1260                                      length_from_afi(X509v3_addr_get_afi(fc))))
1261                     (void)sk_IPAddressFamily_set(child, j, fp);
1262                 else
1263                     validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1264             }
1265         }
1266     }
1267
1268     /*
1269      * Trust anchor can't inherit.
1270      */
1271     if (x->rfc3779_addr != NULL) {
1272         for (j = 0; j < sk_IPAddressFamily_num(x->rfc3779_addr); j++) {
1273             IPAddressFamily *fp =
1274                 sk_IPAddressFamily_value(x->rfc3779_addr, j);
1275             if (fp->ipAddressChoice->type == IPAddressChoice_inherit
1276                 && sk_IPAddressFamily_find(child, fp) >= 0)
1277                 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1278         }
1279     }
1280
1281  done:
1282     sk_IPAddressFamily_free(child);
1283     return ret;
1284 }
1285
1286 #undef validation_err
1287
1288 /*
1289  * RFC 3779 2.3 path validation -- called from X509_verify_cert().
1290  */
1291 int X509v3_addr_validate_path(X509_STORE_CTX *ctx)
1292 {
1293     if (ctx->chain == NULL
1294             || sk_X509_num(ctx->chain) == 0
1295             || ctx->verify_cb == NULL) {
1296         ctx->error = X509_V_ERR_UNSPECIFIED;
1297         return 0;
1298     }
1299     return addr_validate_path_internal(ctx, ctx->chain, NULL);
1300 }
1301
1302 /*
1303  * RFC 3779 2.3 path validation of an extension.
1304  * Test whether chain covers extension.
1305  */
1306 int X509v3_addr_validate_resource_set(STACK_OF(X509) *chain,
1307                                   IPAddrBlocks *ext, int allow_inheritance)
1308 {
1309     if (ext == NULL)
1310         return 1;
1311     if (chain == NULL || sk_X509_num(chain) == 0)
1312         return 0;
1313     if (!allow_inheritance && X509v3_addr_inherits(ext))
1314         return 0;
1315     return addr_validate_path_internal(NULL, chain, ext);
1316 }
1317
1318 #endif                          /* OPENSSL_NO_RFC3779 */