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