crypto/x509/v3_addr.c

   1 /*
   2  * Copyright 2006-2020 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
  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 "crypto/x509.h"
  24 #include "ext_dat.h"
  25
  26 #ifndef OPENSSL_NO_RFC3779
  27
  28 DEFINE_STACK_OF(IPAddressOrRange)
  29 DEFINE_STACK_OF(IPAddressFamily)
  30 DEFINE_STACK_OF(CONF_VALUE)
  31 DEFINE_STACK_OF(X509)
  32
  33 /*
  34  * OpenSSL ASN.1 template translation of RFC 3779 2.2.3.
  35  */
  36
  37 ASN1_SEQUENCE(IPAddressRange) = {
  38   ASN1_SIMPLE(IPAddressRange, min, ASN1_BIT_STRING),
  39   ASN1_SIMPLE(IPAddressRange, max, ASN1_BIT_STRING)
  40 } ASN1_SEQUENCE_END(IPAddressRange)
  41
  42 ASN1_CHOICE(IPAddressOrRange) = {
  43   ASN1_SIMPLE(IPAddressOrRange, u.addressPrefix, ASN1_BIT_STRING),
  44   ASN1_SIMPLE(IPAddressOrRange, u.addressRange,  IPAddressRange)
  45 } ASN1_CHOICE_END(IPAddressOrRange)
  46
  47 ASN1_CHOICE(IPAddressChoice) = {
  48   ASN1_SIMPLE(IPAddressChoice,      u.inherit,           ASN1_NULL),
  49   ASN1_SEQUENCE_OF(IPAddressChoice, u.addressesOrRanges, IPAddressOrRange)
  50 } ASN1_CHOICE_END(IPAddressChoice)
  51
  52 ASN1_SEQUENCE(IPAddressFamily) = {
  53   ASN1_SIMPLE(IPAddressFamily, addressFamily,   ASN1_OCTET_STRING),
  54   ASN1_SIMPLE(IPAddressFamily, ipAddressChoice, IPAddressChoice)
  55 } ASN1_SEQUENCE_END(IPAddressFamily)
  56
  57 ASN1_ITEM_TEMPLATE(IPAddrBlocks) =
  58   ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0,
  59                         IPAddrBlocks, IPAddressFamily)
  60 static_ASN1_ITEM_TEMPLATE_END(IPAddrBlocks)
  61
  62 IMPLEMENT_ASN1_FUNCTIONS(IPAddressRange)
  63 IMPLEMENT_ASN1_FUNCTIONS(IPAddressOrRange)
  64 IMPLEMENT_ASN1_FUNCTIONS(IPAddressChoice)
  65 IMPLEMENT_ASN1_FUNCTIONS(IPAddressFamily)
  66
  67 /*
  68  * How much buffer space do we need for a raw address?
  69  */
  70 #define ADDR_RAW_BUF_LEN        16
  71
  72 /*
  73  * What's the address length associated with this AFI?
  74  */
  75 static int length_from_afi(const unsigned afi)
  76 {
  77     switch (afi) {
  78     case IANA_AFI_IPV4:
  79         return 4;
  80     case IANA_AFI_IPV6:
  81         return 16;
  82     default:
  83         return 0;
  84     }
  85 }
  86
  87 /*
  88  * Extract the AFI from an IPAddressFamily.
  89  */
  90 unsigned int X509v3_addr_get_afi(const IPAddressFamily *f)
  91 {
  92     if (f == NULL
  93             || f->addressFamily == NULL
  94             || f->addressFamily->data == NULL
  95             || f->addressFamily->length < 2)
  96         return 0;
  97     return (f->addressFamily->data[0] << 8) | f->addressFamily->data[1];
  98 }
  99
 100 /*
 101  * Expand the bitstring form of an address into a raw byte array.
 102  * At the moment this is coded for simplicity, not speed.
 103  */
 104 static int addr_expand(unsigned char *addr,
 105                        const ASN1_BIT_STRING *bs,
 106                        const int length, const unsigned char fill)
 107 {
 108     if (bs->length < 0 || bs->length > length)
 109         return 0;
 110     if (bs->length > 0) {
 111         memcpy(addr, bs->data, bs->length);
 112         if ((bs->flags & 7) != 0) {
 113             unsigned char mask = 0xFF >> (8 - (bs->flags & 7));
 114             if (fill == 0)
 115                 addr[bs->length - 1] &= ~mask;
 116             else
 117                 addr[bs->length - 1] |= mask;
 118         }
 119     }
 120     memset(addr + bs->length, fill, length - bs->length);
 121     return 1;
 122 }
 123
 124 /*
 125  * Extract the prefix length from a bitstring.
 126  */
 127 #define addr_prefixlen(bs) ((int) ((bs)->length * 8 - ((bs)->flags & 7)))
 128
 129 /*
 130  * i2r handler for one address bitstring.
 131  */
 132 static int i2r_address(BIO *out,
 133                        const unsigned afi,
 134                        const unsigned char fill, const ASN1_BIT_STRING *bs)
 135 {
 136     unsigned char addr[ADDR_RAW_BUF_LEN];
 137     int i, n;
 138
 139     if (bs->length < 0)
 140         return 0;
 141     switch (afi) {
 142     case IANA_AFI_IPV4:
 143         if (!addr_expand(addr, bs, 4, fill))
 144             return 0;
 145         BIO_printf(out, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
 146         break;
 147         /* TODO possibly combine with ipaddr_to_asc() */
 148     case IANA_AFI_IPV6:
 149         if (!addr_expand(addr, bs, 16, fill))
 150             return 0;
 151         for (n = 16; n > 1 && addr[n - 1] == 0x00 && addr[n - 2] == 0x00;
 152              n -= 2) ;
 153         for (i = 0; i < n; i += 2)
 154             BIO_printf(out, "%x%s", (addr[i] << 8) | addr[i + 1],
 155                        (i < 14 ? ":" : ""));
 156         if (i < 16)
 157             BIO_puts(out, ":");
 158         if (i == 0)
 159             BIO_puts(out, ":");
 160         break;
 161     default:
 162         for (i = 0; i < bs->length; i++)
 163             BIO_printf(out, "%s%02x", (i > 0 ? ":" : ""), bs->data[i]);
 164         BIO_printf(out, "[%d]", (int)(bs->flags & 7));
 165         break;
 166     }
 167     return 1;
 168 }
 169
 170 /*
 171  * i2r handler for a sequence of addresses and ranges.
 172  */
 173 static int i2r_IPAddressOrRanges(BIO *out,
 174                                  const int indent,
 175                                  const IPAddressOrRanges *aors,
 176                                  const unsigned afi)
 177 {
 178     int i;
 179     for (i = 0; i < sk_IPAddressOrRange_num(aors); i++) {
 180         const IPAddressOrRange *aor = sk_IPAddressOrRange_value(aors, i);
 181         BIO_printf(out, "%*s", indent, "");
 182         switch (aor->type) {
 183         case IPAddressOrRange_addressPrefix:
 184             if (!i2r_address(out, afi, 0x00, aor->u.addressPrefix))
 185                 return 0;
 186             BIO_printf(out, "/%d\n", addr_prefixlen(aor->u.addressPrefix));
 187             continue;
 188         case IPAddressOrRange_addressRange:
 189             if (!i2r_address(out, afi, 0x00, aor->u.addressRange->min))
 190                 return 0;
 191             BIO_puts(out, "-");
 192             if (!i2r_address(out, afi, 0xFF, aor->u.addressRange->max))
 193                 return 0;
 194             BIO_puts(out, "\n");
 195             continue;
 196         }
 197     }
 198     return 1;
 199 }
 200
 201 /*
 202  * i2r handler for an IPAddrBlocks extension.
 203  */
 204 static int i2r_IPAddrBlocks(const X509V3_EXT_METHOD *method,
 205                             void *ext, BIO *out, int indent)
 206 {
 207     const IPAddrBlocks *addr = ext;
 208     int i;
 209     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 210         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
 211         const unsigned int afi = X509v3_addr_get_afi(f);
 212         switch (afi) {
 213         case IANA_AFI_IPV4:
 214             BIO_printf(out, "%*sIPv4", indent, "");
 215             break;
 216         case IANA_AFI_IPV6:
 217             BIO_printf(out, "%*sIPv6", indent, "");
 218             break;
 219         default:
 220             BIO_printf(out, "%*sUnknown AFI %u", indent, "", afi);
 221             break;
 222         }
 223         if (f->addressFamily->length > 2) {
 224             switch (f->addressFamily->data[2]) {
 225             case 1:
 226                 BIO_puts(out, " (Unicast)");
 227                 break;
 228             case 2:
 229                 BIO_puts(out, " (Multicast)");
 230                 break;
 231             case 3:
 232                 BIO_puts(out, " (Unicast/Multicast)");
 233                 break;
 234             case 4:
 235                 BIO_puts(out, " (MPLS)");
 236                 break;
 237             case 64:
 238                 BIO_puts(out, " (Tunnel)");
 239                 break;
 240             case 65:
 241                 BIO_puts(out, " (VPLS)");
 242                 break;
 243             case 66:
 244                 BIO_puts(out, " (BGP MDT)");
 245                 break;
 246             case 128:
 247                 BIO_puts(out, " (MPLS-labeled VPN)");
 248                 break;
 249             default:
 250                 BIO_printf(out, " (Unknown SAFI %u)",
 251                            (unsigned)f->addressFamily->data[2]);
 252                 break;
 253             }
 254         }
 255         switch (f->ipAddressChoice->type) {
 256         case IPAddressChoice_inherit:
 257             BIO_puts(out, ": inherit\n");
 258             break;
 259         case IPAddressChoice_addressesOrRanges:
 260             BIO_puts(out, ":\n");
 261             if (!i2r_IPAddressOrRanges(out,
 262                                        indent + 2,
 263                                        f->ipAddressChoice->
 264                                        u.addressesOrRanges, afi))
 265                 return 0;
 266             break;
 267         }
 268     }
 269     return 1;
 270 }
 271
 272 /*
 273  * Sort comparison function for a sequence of IPAddressOrRange
 274  * elements.
 275  *
 276  * There's no sane answer we can give if addr_expand() fails, and an
 277  * assertion failure on externally supplied data is seriously uncool,
 278  * so we just arbitrarily declare that if given invalid inputs this
 279  * function returns -1.  If this messes up your preferred sort order
 280  * for garbage input, tough noogies.
 281  */
 282 static int IPAddressOrRange_cmp(const IPAddressOrRange *a,
 283                                 const IPAddressOrRange *b, const int length)
 284 {
 285     unsigned char addr_a[ADDR_RAW_BUF_LEN], addr_b[ADDR_RAW_BUF_LEN];
 286     int prefixlen_a = 0, prefixlen_b = 0;
 287     int r;
 288
 289     switch (a->type) {
 290     case IPAddressOrRange_addressPrefix:
 291         if (!addr_expand(addr_a, a->u.addressPrefix, length, 0x00))
 292             return -1;
 293         prefixlen_a = addr_prefixlen(a->u.addressPrefix);
 294         break;
 295     case IPAddressOrRange_addressRange:
 296         if (!addr_expand(addr_a, a->u.addressRange->min, length, 0x00))
 297             return -1;
 298         prefixlen_a = length * 8;
 299         break;
 300     }
 301
 302     switch (b->type) {
 303     case IPAddressOrRange_addressPrefix:
 304         if (!addr_expand(addr_b, b->u.addressPrefix, length, 0x00))
 305             return -1;
 306         prefixlen_b = addr_prefixlen(b->u.addressPrefix);
 307         break;
 308     case IPAddressOrRange_addressRange:
 309         if (!addr_expand(addr_b, b->u.addressRange->min, length, 0x00))
 310             return -1;
 311         prefixlen_b = length * 8;
 312         break;
 313     }
 314
 315     if ((r = memcmp(addr_a, addr_b, length)) != 0)
 316         return r;
 317     else
 318         return prefixlen_a - prefixlen_b;
 319 }
 320
 321 /*
 322  * IPv4-specific closure over IPAddressOrRange_cmp, since sk_sort()
 323  * comparison routines are only allowed two arguments.
 324  */
 325 static int v4IPAddressOrRange_cmp(const IPAddressOrRange *const *a,
 326                                   const IPAddressOrRange *const *b)
 327 {
 328     return IPAddressOrRange_cmp(*a, *b, 4);
 329 }
 330
 331 /*
 332  * IPv6-specific closure over IPAddressOrRange_cmp, since sk_sort()
 333  * comparison routines are only allowed two arguments.
 334  */
 335 static int v6IPAddressOrRange_cmp(const IPAddressOrRange *const *a,
 336                                   const IPAddressOrRange *const *b)
 337 {
 338     return IPAddressOrRange_cmp(*a, *b, 16);
 339 }
 340
 341 /*
 342  * Calculate whether a range collapses to a prefix.
 343  * See last paragraph of RFC 3779 2.2.3.7.
 344  */
 345 static int range_should_be_prefix(const unsigned char *min,
 346                                   const unsigned char *max, const int length)
 347 {
 348     unsigned char mask;
 349     int i, j;
 350
 351     if (memcmp(min, max, length) <= 0)
 352         return -1;
 353     for (i = 0; i < length && min[i] == max[i]; i++) ;
 354     for (j = length - 1; j >= 0 && min[j] == 0x00 && max[j] == 0xFF; j--) ;
 355     if (i < j)
 356         return -1;
 357     if (i > j)
 358         return i * 8;
 359     mask = min[i] ^ max[i];
 360     switch (mask) {
 361     case 0x01:
 362         j = 7;
 363         break;
 364     case 0x03:
 365         j = 6;
 366         break;
 367     case 0x07:
 368         j = 5;
 369         break;
 370     case 0x0F:
 371         j = 4;
 372         break;
 373     case 0x1F:
 374         j = 3;
 375         break;
 376     case 0x3F:
 377         j = 2;
 378         break;
 379     case 0x7F:
 380         j = 1;
 381         break;
 382     default:
 383         return -1;
 384     }
 385     if ((min[i] & mask) != 0 || (max[i] & mask) != mask)
 386         return -1;
 387     else
 388         return i * 8 + j;
 389 }
 390
 391 /*
 392  * Construct a prefix.
 393  */
 394 static int make_addressPrefix(IPAddressOrRange **result,
 395                               unsigned char *addr, const int prefixlen)
 396 {
 397     int bytelen = (prefixlen + 7) / 8, bitlen = prefixlen % 8;
 398     IPAddressOrRange *aor = IPAddressOrRange_new();
 399
 400     if (aor == NULL)
 401         return 0;
 402     aor->type = IPAddressOrRange_addressPrefix;
 403     if (aor->u.addressPrefix == NULL &&
 404         (aor->u.addressPrefix = ASN1_BIT_STRING_new()) == NULL)
 405         goto err;
 406     if (!ASN1_BIT_STRING_set(aor->u.addressPrefix, addr, bytelen))
 407         goto err;
 408     aor->u.addressPrefix->flags &= ~7;
 409     aor->u.addressPrefix->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 410     if (bitlen > 0) {
 411         aor->u.addressPrefix->data[bytelen - 1] &= ~(0xFF >> bitlen);
 412         aor->u.addressPrefix->flags |= 8 - bitlen;
 413     }
 414
 415     *result = aor;
 416     return 1;
 417
 418  err:
 419     IPAddressOrRange_free(aor);
 420     return 0;
 421 }
 422
 423 /*
 424  * Construct a range.  If it can be expressed as a prefix,
 425  * return a prefix instead.  Doing this here simplifies
 426  * the rest of the code considerably.
 427  */
 428 static int make_addressRange(IPAddressOrRange **result,
 429                              unsigned char *min,
 430                              unsigned char *max, const int length)
 431 {
 432     IPAddressOrRange *aor;
 433     int i, prefixlen;
 434
 435     if ((prefixlen = range_should_be_prefix(min, max, length)) >= 0)
 436         return make_addressPrefix(result, min, prefixlen);
 437
 438     if ((aor = IPAddressOrRange_new()) == NULL)
 439         return 0;
 440     aor->type = IPAddressOrRange_addressRange;
 441     if ((aor->u.addressRange = IPAddressRange_new()) == NULL)
 442         goto err;
 443     if (aor->u.addressRange->min == NULL &&
 444         (aor->u.addressRange->min = ASN1_BIT_STRING_new()) == NULL)
 445         goto err;
 446     if (aor->u.addressRange->max == NULL &&
 447         (aor->u.addressRange->max = ASN1_BIT_STRING_new()) == NULL)
 448         goto err;
 449
 450     for (i = length; i > 0 && min[i - 1] == 0x00; --i) ;
 451     if (!ASN1_BIT_STRING_set(aor->u.addressRange->min, min, i))
 452         goto err;
 453     aor->u.addressRange->min->flags &= ~7;
 454     aor->u.addressRange->min->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 455     if (i > 0) {
 456         unsigned char b = min[i - 1];
 457         int j = 1;
 458         while ((b & (0xFFU >> j)) != 0)
 459             ++j;
 460         aor->u.addressRange->min->flags |= 8 - j;
 461     }
 462
 463     for (i = length; i > 0 && max[i - 1] == 0xFF; --i) ;
 464     if (!ASN1_BIT_STRING_set(aor->u.addressRange->max, max, i))
 465         goto err;
 466     aor->u.addressRange->max->flags &= ~7;
 467     aor->u.addressRange->max->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 468     if (i > 0) {
 469         unsigned char b = max[i - 1];
 470         int j = 1;
 471         while ((b & (0xFFU >> j)) != (0xFFU >> j))
 472             ++j;
 473         aor->u.addressRange->max->flags |= 8 - j;
 474     }
 475
 476     *result = aor;
 477     return 1;
 478
 479  err:
 480     IPAddressOrRange_free(aor);
 481     return 0;
 482 }
 483
 484 /*
 485  * Construct a new address family or find an existing one.
 486  */
 487 static IPAddressFamily *make_IPAddressFamily(IPAddrBlocks *addr,
 488                                              const unsigned afi,
 489                                              const unsigned *safi)
 490 {
 491     IPAddressFamily *f;
 492     unsigned char key[3];
 493     int keylen;
 494     int i;
 495
 496     key[0] = (afi >> 8) & 0xFF;
 497     key[1] = afi & 0xFF;
 498     if (safi != NULL) {
 499         key[2] = *safi & 0xFF;
 500         keylen = 3;
 501     } else {
 502         keylen = 2;
 503     }
 504
 505     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 506         f = sk_IPAddressFamily_value(addr, i);
 507         if (f->addressFamily->length == keylen &&
 508             !memcmp(f->addressFamily->data, key, keylen))
 509             return f;
 510     }
 511
 512     if ((f = IPAddressFamily_new()) == NULL)
 513         goto err;
 514     if (f->ipAddressChoice == NULL &&
 515         (f->ipAddressChoice = IPAddressChoice_new()) == NULL)
 516         goto err;
 517     if (f->addressFamily == NULL &&
 518         (f->addressFamily = ASN1_OCTET_STRING_new()) == NULL)
 519         goto err;
 520     if (!ASN1_OCTET_STRING_set(f->addressFamily, key, keylen))
 521         goto err;
 522     if (!sk_IPAddressFamily_push(addr, f))
 523         goto err;
 524
 525     return f;
 526
 527  err:
 528     IPAddressFamily_free(f);
 529     return NULL;
 530 }
 531
 532 /*
 533  * Add an inheritance element.
 534  */
 535 int X509v3_addr_add_inherit(IPAddrBlocks *addr,
 536                             const unsigned afi, const unsigned *safi)
 537 {
 538     IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
 539     if (f == NULL ||
 540         f->ipAddressChoice == NULL ||
 541         (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
 542          f->ipAddressChoice->u.addressesOrRanges != NULL))
 543         return 0;
 544     if (f->ipAddressChoice->type == IPAddressChoice_inherit &&
 545         f->ipAddressChoice->u.inherit != NULL)
 546         return 1;
 547     if (f->ipAddressChoice->u.inherit == NULL &&
 548         (f->ipAddressChoice->u.inherit = ASN1_NULL_new()) == NULL)
 549         return 0;
 550     f->ipAddressChoice->type = IPAddressChoice_inherit;
 551     return 1;
 552 }
 553
 554 /*
 555  * Construct an IPAddressOrRange sequence, or return an existing one.
 556  */
 557 static IPAddressOrRanges *make_prefix_or_range(IPAddrBlocks *addr,
 558                                                const unsigned afi,
 559                                                const unsigned *safi)
 560 {
 561     IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
 562     IPAddressOrRanges *aors = NULL;
 563
 564     if (f == NULL ||
 565         f->ipAddressChoice == NULL ||
 566         (f->ipAddressChoice->type == IPAddressChoice_inherit &&
 567          f->ipAddressChoice->u.inherit != NULL))
 568         return NULL;
 569     if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges)
 570         aors = f->ipAddressChoice->u.addressesOrRanges;
 571     if (aors != NULL)
 572         return aors;
 573     if ((aors = sk_IPAddressOrRange_new_null()) == NULL)
 574         return NULL;
 575     switch (afi) {
 576     case IANA_AFI_IPV4:
 577         (void)sk_IPAddressOrRange_set_cmp_func(aors, v4IPAddressOrRange_cmp);
 578         break;
 579     case IANA_AFI_IPV6:
 580         (void)sk_IPAddressOrRange_set_cmp_func(aors, v6IPAddressOrRange_cmp);
 581         break;
 582     }
 583     f->ipAddressChoice->type = IPAddressChoice_addressesOrRanges;
 584     f->ipAddressChoice->u.addressesOrRanges = aors;
 585     return aors;
 586 }
 587
 588 /*
 589  * Add a prefix.
 590  */
 591 int X509v3_addr_add_prefix(IPAddrBlocks *addr,
 592                            const unsigned afi,
 593                            const unsigned *safi,
 594                            unsigned char *a, const int prefixlen)
 595 {
 596     IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
 597     IPAddressOrRange *aor;
 598     if (aors == NULL || !make_addressPrefix(&aor, a, prefixlen))
 599         return 0;
 600     if (sk_IPAddressOrRange_push(aors, aor))
 601         return 1;
 602     IPAddressOrRange_free(aor);
 603     return 0;
 604 }
 605
 606 /*
 607  * Add a range.
 608  */
 609 int X509v3_addr_add_range(IPAddrBlocks *addr,
 610                           const unsigned afi,
 611                           const unsigned *safi,
 612                           unsigned char *min, unsigned char *max)
 613 {
 614     IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
 615     IPAddressOrRange *aor;
 616     int length = length_from_afi(afi);
 617     if (aors == NULL)
 618         return 0;
 619     if (!make_addressRange(&aor, min, max, length))
 620         return 0;
 621     if (sk_IPAddressOrRange_push(aors, aor))
 622         return 1;
 623     IPAddressOrRange_free(aor);
 624     return 0;
 625 }
 626
 627 /*
 628  * Extract min and max values from an IPAddressOrRange.
 629  */
 630 static int extract_min_max(IPAddressOrRange *aor,
 631                            unsigned char *min, unsigned char *max, int length)
 632 {
 633     if (aor == NULL || min == NULL || max == NULL)
 634         return 0;
 635     switch (aor->type) {
 636     case IPAddressOrRange_addressPrefix:
 637         return (addr_expand(min, aor->u.addressPrefix, length, 0x00) &&
 638                 addr_expand(max, aor->u.addressPrefix, length, 0xFF));
 639     case IPAddressOrRange_addressRange:
 640         return (addr_expand(min, aor->u.addressRange->min, length, 0x00) &&
 641                 addr_expand(max, aor->u.addressRange->max, length, 0xFF));
 642     }
 643     return 0;
 644 }
 645
 646 /*
 647  * Public wrapper for extract_min_max().
 648  */
 649 int X509v3_addr_get_range(IPAddressOrRange *aor,
 650                           const unsigned afi,
 651                           unsigned char *min,
 652                           unsigned char *max, const int length)
 653 {
 654     int afi_length = length_from_afi(afi);
 655     if (aor == NULL || min == NULL || max == NULL ||
 656         afi_length == 0 || length < afi_length ||
 657         (aor->type != IPAddressOrRange_addressPrefix &&
 658          aor->type != IPAddressOrRange_addressRange) ||
 659         !extract_min_max(aor, min, max, afi_length))
 660         return 0;
 661
 662     return afi_length;
 663 }
 664
 665 /*
 666  * Sort comparison function for a sequence of IPAddressFamily.
 667  *
 668  * The last paragraph of RFC 3779 2.2.3.3 is slightly ambiguous about
 669  * the ordering: I can read it as meaning that IPv6 without a SAFI
 670  * comes before IPv4 with a SAFI, which seems pretty weird.  The
 671  * examples in appendix B suggest that the author intended the
 672  * null-SAFI rule to apply only within a single AFI, which is what I
 673  * would have expected and is what the following code implements.
 674  */
 675 static int IPAddressFamily_cmp(const IPAddressFamily *const *a_,
 676                                const IPAddressFamily *const *b_)
 677 {
 678     const ASN1_OCTET_STRING *a = (*a_)->addressFamily;
 679     const ASN1_OCTET_STRING *b = (*b_)->addressFamily;
 680     int len = ((a->length <= b->length) ? a->length : b->length);
 681     int cmp = memcmp(a->data, b->data, len);
 682     return cmp ? cmp : a->length - b->length;
 683 }
 684
 685 /*
 686  * Check whether an IPAddrBLocks is in canonical form.
 687  */
 688 int X509v3_addr_is_canonical(IPAddrBlocks *addr)
 689 {
 690     unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
 691     unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
 692     IPAddressOrRanges *aors;
 693     int i, j, k;
 694
 695     /*
 696      * Empty extension is canonical.
 697      */
 698     if (addr == NULL)
 699         return 1;
 700
 701     /*
 702      * Check whether the top-level list is in order.
 703      */
 704     for (i = 0; i < sk_IPAddressFamily_num(addr) - 1; i++) {
 705         const IPAddressFamily *a = sk_IPAddressFamily_value(addr, i);
 706         const IPAddressFamily *b = sk_IPAddressFamily_value(addr, i + 1);
 707         if (IPAddressFamily_cmp(&a, &b) >= 0)
 708             return 0;
 709     }
 710
 711     /*
 712      * Top level's ok, now check each address family.
 713      */
 714     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 715         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
 716         int length = length_from_afi(X509v3_addr_get_afi(f));
 717
 718         /*
 719          * Inheritance is canonical.  Anything other than inheritance or
 720          * a SEQUENCE OF IPAddressOrRange is an ASN.1 error or something.
 721          */
 722         if (f == NULL || f->ipAddressChoice == NULL)
 723             return 0;
 724         switch (f->ipAddressChoice->type) {
 725         case IPAddressChoice_inherit:
 726             continue;
 727         case IPAddressChoice_addressesOrRanges:
 728             break;
 729         default:
 730             return 0;
 731         }
 732
 733         /*
 734          * It's an IPAddressOrRanges sequence, check it.
 735          */
 736         aors = f->ipAddressChoice->u.addressesOrRanges;
 737         if (sk_IPAddressOrRange_num(aors) == 0)
 738             return 0;
 739         for (j = 0; j < sk_IPAddressOrRange_num(aors) - 1; j++) {
 740             IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
 741             IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, j + 1);
 742
 743             if (!extract_min_max(a, a_min, a_max, length) ||
 744                 !extract_min_max(b, b_min, b_max, length))
 745                 return 0;
 746
 747             /*
 748              * Punt misordered list, overlapping start, or inverted range.
 749              */
 750             if (memcmp(a_min, b_min, length) >= 0 ||
 751                 memcmp(a_min, a_max, length) > 0 ||
 752                 memcmp(b_min, b_max, length) > 0)
 753                 return 0;
 754
 755             /*
 756              * Punt if adjacent or overlapping.  Check for adjacency by
 757              * subtracting one from b_min first.
 758              */
 759             for (k = length - 1; k >= 0 && b_min[k]-- == 0x00; k--) ;
 760             if (memcmp(a_max, b_min, length) >= 0)
 761                 return 0;
 762
 763             /*
 764              * Check for range that should be expressed as a prefix.
 765              */
 766             if (a->type == IPAddressOrRange_addressRange &&
 767                 range_should_be_prefix(a_min, a_max, length) >= 0)
 768                 return 0;
 769         }
 770
 771         /*
 772          * Check range to see if it's inverted or should be a
 773          * prefix.
 774          */
 775         j = sk_IPAddressOrRange_num(aors) - 1;
 776         {
 777             IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
 778             if (a != NULL && a->type == IPAddressOrRange_addressRange) {
 779                 if (!extract_min_max(a, a_min, a_max, length))
 780                     return 0;
 781                 if (memcmp(a_min, a_max, length) > 0 ||
 782                     range_should_be_prefix(a_min, a_max, length) >= 0)
 783                     return 0;
 784             }
 785         }
 786     }
 787
 788     /*
 789      * If we made it through all that, we're happy.
 790      */
 791     return 1;
 792 }
 793
 794 /*
 795  * Whack an IPAddressOrRanges into canonical form.
 796  */
 797 static int IPAddressOrRanges_canonize(IPAddressOrRanges *aors,
 798                                       const unsigned afi)
 799 {
 800     int i, j, length = length_from_afi(afi);
 801
 802     /*
 803      * Sort the IPAddressOrRanges sequence.
 804      */
 805     sk_IPAddressOrRange_sort(aors);
 806
 807     /*
 808      * Clean up representation issues, punt on duplicates or overlaps.
 809      */
 810     for (i = 0; i < sk_IPAddressOrRange_num(aors) - 1; i++) {
 811         IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, i);
 812         IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, i + 1);
 813         unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
 814         unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
 815
 816         if (!extract_min_max(a, a_min, a_max, length) ||
 817             !extract_min_max(b, b_min, b_max, length))
 818             return 0;
 819
 820         /*
 821          * Punt inverted ranges.
 822          */
 823         if (memcmp(a_min, a_max, length) > 0 ||
 824             memcmp(b_min, b_max, length) > 0)
 825             return 0;
 826
 827         /*
 828          * Punt overlaps.
 829          */
 830         if (memcmp(a_max, b_min, length) >= 0)
 831             return 0;
 832
 833         /*
 834          * Merge if a and b are adjacent.  We check for
 835          * adjacency by subtracting one from b_min first.
 836          */
 837         for (j = length - 1; j >= 0 && b_min[j]-- == 0x00; j--) ;
 838         if (memcmp(a_max, b_min, length) == 0) {
 839             IPAddressOrRange *merged;
 840             if (!make_addressRange(&merged, a_min, b_max, length))
 841                 return 0;
 842             (void)sk_IPAddressOrRange_set(aors, i, merged);
 843             (void)sk_IPAddressOrRange_delete(aors, i + 1);
 844             IPAddressOrRange_free(a);
 845             IPAddressOrRange_free(b);
 846             --i;
 847             continue;
 848         }
 849     }
 850
 851     /*
 852      * Check for inverted final range.
 853      */
 854     j = sk_IPAddressOrRange_num(aors) - 1;
 855     {
 856         IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
 857         if (a != NULL && a->type == IPAddressOrRange_addressRange) {
 858             unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
 859             if (!extract_min_max(a, a_min, a_max, length))
 860                 return 0;
 861             if (memcmp(a_min, a_max, length) > 0)
 862                 return 0;
 863         }
 864     }
 865
 866     return 1;
 867 }
 868
 869 /*
 870  * Whack an IPAddrBlocks extension into canonical form.
 871  */
 872 int X509v3_addr_canonize(IPAddrBlocks *addr)
 873 {
 874     int i;
 875     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 876         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
 877         if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
 878             !IPAddressOrRanges_canonize(f->ipAddressChoice->
 879                                         u.addressesOrRanges,
 880                                         X509v3_addr_get_afi(f)))
 881             return 0;
 882     }
 883     (void)sk_IPAddressFamily_set_cmp_func(addr, IPAddressFamily_cmp);
 884     sk_IPAddressFamily_sort(addr);
 885     if (!ossl_assert(X509v3_addr_is_canonical(addr)))
 886         return 0;
 887     return 1;
 888 }
 889
 890 /*
 891  * v2i handler for the IPAddrBlocks extension.
 892  */
 893 static void *v2i_IPAddrBlocks(const struct v3_ext_method *method,
 894                               struct v3_ext_ctx *ctx,
 895                               STACK_OF(CONF_VALUE) *values)
 896 {
 897     static const char v4addr_chars[] = "0123456789.";
 898     static const char v6addr_chars[] = "0123456789.:abcdefABCDEF";
 899     IPAddrBlocks *addr = NULL;
 900     char *s = NULL, *t;
 901     int i;
 902
 903     if ((addr = sk_IPAddressFamily_new(IPAddressFamily_cmp)) == NULL) {
 904         X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
 905         return NULL;
 906     }
 907
 908     for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
 909         CONF_VALUE *val = sk_CONF_VALUE_value(values, i);
 910         unsigned char min[ADDR_RAW_BUF_LEN], max[ADDR_RAW_BUF_LEN];
 911         unsigned afi, *safi = NULL, safi_;
 912         const char *addr_chars = NULL;
 913         int prefixlen, i1, i2, delim, length;
 914
 915         if (!v3_name_cmp(val->name, "IPv4")) {
 916             afi = IANA_AFI_IPV4;
 917         } else if (!v3_name_cmp(val->name, "IPv6")) {
 918             afi = IANA_AFI_IPV6;
 919         } else if (!v3_name_cmp(val->name, "IPv4-SAFI")) {
 920             afi = IANA_AFI_IPV4;
 921             safi = &safi_;
 922         } else if (!v3_name_cmp(val->name, "IPv6-SAFI")) {
 923             afi = IANA_AFI_IPV6;
 924             safi = &safi_;
 925         } else {
 926             X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
 927                       X509V3_R_EXTENSION_NAME_ERROR);
 928             X509V3_conf_err(val);
 929             goto err;
 930         }
 931
 932         switch (afi) {
 933         case IANA_AFI_IPV4:
 934             addr_chars = v4addr_chars;
 935             break;
 936         case IANA_AFI_IPV6:
 937             addr_chars = v6addr_chars;
 938             break;
 939         }
 940
 941         length = length_from_afi(afi);
 942
 943         /*
 944          * Handle SAFI, if any, and OPENSSL_strdup() so we can null-terminate
 945          * the other input values.
 946          */
 947         if (safi != NULL) {
 948             *safi = strtoul(val->value, &t, 0);
 949             t += strspn(t, " \t");
 950             if (*safi > 0xFF || *t++ != ':') {
 951                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, X509V3_R_INVALID_SAFI);
 952                 X509V3_conf_err(val);
 953                 goto err;
 954             }
 955             t += strspn(t, " \t");
 956             s = OPENSSL_strdup(t);
 957         } else {
 958             s = OPENSSL_strdup(val->value);
 959         }
 960         if (s == NULL) {
 961             X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
 962             goto err;
 963         }
 964
 965         /*
 966          * Check for inheritance.  Not worth additional complexity to
 967          * optimize this (seldom-used) case.
 968          */
 969         if (strcmp(s, "inherit") == 0) {
 970             if (!X509v3_addr_add_inherit(addr, afi, safi)) {
 971                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
 972                           X509V3_R_INVALID_INHERITANCE);
 973                 X509V3_conf_err(val);
 974                 goto err;
 975             }
 976             OPENSSL_free(s);
 977             s = NULL;
 978             continue;
 979         }
 980
 981         i1 = strspn(s, addr_chars);
 982         i2 = i1 + strspn(s + i1, " \t");
 983         delim = s[i2++];
 984         s[i1] = '\0';
 985
 986         if (a2i_ipadd(min, s) != length) {
 987             X509V3err(X509V3_F_V2I_IPADDRBLOCKS, X509V3_R_INVALID_IPADDRESS);
 988             X509V3_conf_err(val);
 989             goto err;
 990         }
 991
 992         switch (delim) {
 993         case '/':
 994             prefixlen = (int)strtoul(s + i2, &t, 10);
 995             if (t == s + i2 || *t != '\0') {
 996                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
 997                           X509V3_R_EXTENSION_VALUE_ERROR);
 998                 X509V3_conf_err(val);
 999                 goto err;
1000             }
1001             if (!X509v3_addr_add_prefix(addr, afi, safi, min, prefixlen)) {
1002                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
1003                 goto err;
1004             }
1005             break;
1006         case '-':
1007             i1 = i2 + strspn(s + i2, " \t");
1008             i2 = i1 + strspn(s + i1, addr_chars);
1009             if (i1 == i2 || s[i2] != '\0') {
1010                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1011                           X509V3_R_EXTENSION_VALUE_ERROR);
1012                 X509V3_conf_err(val);
1013                 goto err;
1014             }
1015             if (a2i_ipadd(max, s + i1) != length) {
1016                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1017                           X509V3_R_INVALID_IPADDRESS);
1018                 X509V3_conf_err(val);
1019                 goto err;
1020             }
1021             if (memcmp(min, max, length_from_afi(afi)) > 0) {
1022                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1023                           X509V3_R_EXTENSION_VALUE_ERROR);
1024                 X509V3_conf_err(val);
1025                 goto err;
1026             }
1027             if (!X509v3_addr_add_range(addr, afi, safi, min, max)) {
1028                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
1029                 goto err;
1030             }
1031             break;
1032         case '\0':
1033             if (!X509v3_addr_add_prefix(addr, afi, safi, min, length * 8)) {
1034                 X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
1035                 goto err;
1036             }
1037             break;
1038         default:
1039             X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
1040                       X509V3_R_EXTENSION_VALUE_ERROR);
1041             X509V3_conf_err(val);
1042             goto err;
1043         }
1044
1045         OPENSSL_free(s);
1046         s = NULL;
1047     }
1048
1049     /*
1050      * Canonize the result, then we're done.
1051      */
1052     if (!X509v3_addr_canonize(addr))
1053         goto err;
1054     return addr;
1055
1056  err:
1057     OPENSSL_free(s);
1058     sk_IPAddressFamily_pop_free(addr, IPAddressFamily_free);
1059     return NULL;
1060 }
1061
1062 /*
1063  * OpenSSL dispatch
1064  */
1065 const X509V3_EXT_METHOD v3_addr = {
1066     NID_sbgp_ipAddrBlock,       /* nid */
1067     0,                          /* flags */
1068     ASN1_ITEM_ref(IPAddrBlocks), /* template */
1069     0, 0, 0, 0,                 /* old functions, ignored */
1070     0,                          /* i2s */
1071     0,                          /* s2i */
1072     0,                          /* i2v */
1073     v2i_IPAddrBlocks,           /* v2i */
1074     i2r_IPAddrBlocks,           /* i2r */
1075     0,                          /* r2i */
1076     NULL                        /* extension-specific data */
1077 };
1078
1079 /*
1080  * Figure out whether extension sues inheritance.
1081  */
1082 int X509v3_addr_inherits(IPAddrBlocks *addr)
1083 {
1084     int i;
1085     if (addr == NULL)
1086         return 0;
1087     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
1088         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
1089         if (f->ipAddressChoice->type == IPAddressChoice_inherit)
1090             return 1;
1091     }
1092     return 0;
1093 }
1094
1095 /*
1096  * Figure out whether parent contains child.
1097  */
1098 static int addr_contains(IPAddressOrRanges *parent,
1099                          IPAddressOrRanges *child, int length)
1100 {
1101     unsigned char p_min[ADDR_RAW_BUF_LEN], p_max[ADDR_RAW_BUF_LEN];
1102     unsigned char c_min[ADDR_RAW_BUF_LEN], c_max[ADDR_RAW_BUF_LEN];
1103     int p, c;
1104
1105     if (child == NULL || parent == child)
1106         return 1;
1107     if (parent == NULL)
1108         return 0;
1109
1110     p = 0;
1111     for (c = 0; c < sk_IPAddressOrRange_num(child); c++) {
1112         if (!extract_min_max(sk_IPAddressOrRange_value(child, c),
1113                              c_min, c_max, length))
1114             return -1;
1115         for (;; p++) {
1116             if (p >= sk_IPAddressOrRange_num(parent))
1117                 return 0;
1118             if (!extract_min_max(sk_IPAddressOrRange_value(parent, p),
1119                                  p_min, p_max, length))
1120                 return 0;
1121             if (memcmp(p_max, c_max, length) < 0)
1122                 continue;
1123             if (memcmp(p_min, c_min, length) > 0)
1124                 return 0;
1125             break;
1126         }
1127     }
1128
1129     return 1;
1130 }
1131
1132 /*
1133  * Test whether a is a subset of b.
1134  */
1135 int X509v3_addr_subset(IPAddrBlocks *a, IPAddrBlocks *b)
1136 {
1137     int i;
1138     if (a == NULL || a == b)
1139         return 1;
1140     if (b == NULL || X509v3_addr_inherits(a) || X509v3_addr_inherits(b))
1141         return 0;
1142     (void)sk_IPAddressFamily_set_cmp_func(b, IPAddressFamily_cmp);
1143     for (i = 0; i < sk_IPAddressFamily_num(a); i++) {
1144         IPAddressFamily *fa = sk_IPAddressFamily_value(a, i);
1145         int j = sk_IPAddressFamily_find(b, fa);
1146         IPAddressFamily *fb;
1147         fb = sk_IPAddressFamily_value(b, j);
1148         if (fb == NULL)
1149             return 0;
1150         if (!addr_contains(fb->ipAddressChoice->u.addressesOrRanges,
1151                            fa->ipAddressChoice->u.addressesOrRanges,
1152                            length_from_afi(X509v3_addr_get_afi(fb))))
1153             return 0;
1154     }
1155     return 1;
1156 }
1157
1158 /*
1159  * Validation error handling via callback.
1160  */
1161 #define validation_err(_err_)           \
1162   do {                                  \
1163     if (ctx != NULL) {                  \
1164       ctx->error = _err_;               \
1165       ctx->error_depth = i;             \
1166       ctx->current_cert = x;            \
1167       ret = ctx->verify_cb(0, ctx);     \
1168     } else {                            \
1169       ret = 0;                          \
1170     }                                   \
1171     if (!ret)                           \
1172       goto done;                        \
1173   } while (0)
1174
1175 /*
1176  * Core code for RFC 3779 2.3 path validation.
1177  *
1178  * Returns 1 for success, 0 on error.
1179  *
1180  * When returning 0, ctx->error MUST be set to an appropriate value other than
1181  * X509_V_OK.
1182  */
1183 static int addr_validate_path_internal(X509_STORE_CTX *ctx,
1184                                        STACK_OF(X509) *chain,
1185                                        IPAddrBlocks *ext)
1186 {
1187     IPAddrBlocks *child = NULL;
1188     int i, j, ret = 1;
1189     X509 *x;
1190
1191     if (!ossl_assert(chain != NULL && sk_X509_num(chain) > 0)
1192             || !ossl_assert(ctx != NULL || ext != NULL)
1193             || !ossl_assert(ctx == NULL || ctx->verify_cb != NULL)) {
1194         if (ctx != NULL)
1195             ctx->error = X509_V_ERR_UNSPECIFIED;
1196         return 0;
1197     }
1198
1199     /*
1200      * Figure out where to start.  If we don't have an extension to
1201      * check, we're done.  Otherwise, check canonical form and
1202      * set up for walking up the chain.
1203      */
1204     if (ext != NULL) {
1205         i = -1;
1206         x = NULL;
1207     } else {
1208         i = 0;
1209         x = sk_X509_value(chain, i);
1210         if ((ext = x->rfc3779_addr) == NULL)
1211             goto done;
1212     }
1213     if (!X509v3_addr_is_canonical(ext))
1214         validation_err(X509_V_ERR_INVALID_EXTENSION);
1215     (void)sk_IPAddressFamily_set_cmp_func(ext, IPAddressFamily_cmp);
1216     if ((child = sk_IPAddressFamily_dup(ext)) == NULL) {
1217         X509V3err(X509V3_F_ADDR_VALIDATE_PATH_INTERNAL,
1218                   ERR_R_MALLOC_FAILURE);
1219         if (ctx != NULL)
1220             ctx->error = X509_V_ERR_OUT_OF_MEM;
1221         ret = 0;
1222         goto done;
1223     }
1224
1225     /*
1226      * Now walk up the chain.  No cert may list resources that its
1227      * parent doesn't list.
1228      */
1229     for (i++; i < sk_X509_num(chain); i++) {
1230         x = sk_X509_value(chain, i);
1231         if (!X509v3_addr_is_canonical(x->rfc3779_addr))
1232             validation_err(X509_V_ERR_INVALID_EXTENSION);
1233         if (x->rfc3779_addr == NULL) {
1234             for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
1235                 IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
1236                 if (fc->ipAddressChoice->type != IPAddressChoice_inherit) {
1237                     validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1238                     break;
1239                 }
1240             }
1241             continue;
1242         }
1243         (void)sk_IPAddressFamily_set_cmp_func(x->rfc3779_addr,
1244                                               IPAddressFamily_cmp);
1245         for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
1246             IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
1247             int k = sk_IPAddressFamily_find(x->rfc3779_addr, fc);
1248             IPAddressFamily *fp =
1249                 sk_IPAddressFamily_value(x->rfc3779_addr, k);
1250             if (fp == NULL) {
1251                 if (fc->ipAddressChoice->type ==
1252                     IPAddressChoice_addressesOrRanges) {
1253                     validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1254                     break;
1255                 }
1256                 continue;
1257             }
1258             if (fp->ipAddressChoice->type ==
1259                 IPAddressChoice_addressesOrRanges) {
1260                 if (fc->ipAddressChoice->type == IPAddressChoice_inherit
1261                     || addr_contains(fp->ipAddressChoice->u.addressesOrRanges,
1262                                      fc->ipAddressChoice->u.addressesOrRanges,
1263                                      length_from_afi(X509v3_addr_get_afi(fc))))
1264                     sk_IPAddressFamily_set(child, j, fp);
1265                 else
1266                     validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1267             }
1268         }
1269     }
1270
1271     /*
1272      * Trust anchor can't inherit.
1273      */
1274     if (x->rfc3779_addr != NULL) {
1275         for (j = 0; j < sk_IPAddressFamily_num(x->rfc3779_addr); j++) {
1276             IPAddressFamily *fp =
1277                 sk_IPAddressFamily_value(x->rfc3779_addr, j);
1278             if (fp->ipAddressChoice->type == IPAddressChoice_inherit
1279                 && sk_IPAddressFamily_find(child, fp) >= 0)
1280                 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1281         }
1282     }
1283
1284  done:
1285     sk_IPAddressFamily_free(child);
1286     return ret;
1287 }
1288
1289 #undef validation_err
1290
1291 /*
1292  * RFC 3779 2.3 path validation -- called from X509_verify_cert().
1293  */
1294 int X509v3_addr_validate_path(X509_STORE_CTX *ctx)
1295 {
1296     if (ctx->chain == NULL
1297             || sk_X509_num(ctx->chain) == 0
1298             || ctx->verify_cb == NULL) {
1299         ctx->error = X509_V_ERR_UNSPECIFIED;
1300         return 0;
1301     }
1302     return addr_validate_path_internal(ctx, ctx->chain, NULL);
1303 }
1304
1305 /*
1306  * RFC 3779 2.3 path validation of an extension.
1307  * Test whether chain covers extension.
1308  */
1309 int X509v3_addr_validate_resource_set(STACK_OF(X509) *chain,
1310                                   IPAddrBlocks *ext, int allow_inheritance)
1311 {
1312     if (ext == NULL)
1313         return 1;
1314     if (chain == NULL || sk_X509_num(chain) == 0)
1315         return 0;
1316     if (!allow_inheritance && X509v3_addr_inherits(ext))
1317         return 0;
1318     return addr_validate_path_internal(NULL, chain, ext);
1319 }
1320
1321 #endif                          /* OPENSSL_NO_RFC3779 */