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     if (memcmp(min, max, length) <= 0)
 344         return -1;
 345     for (i = 0; i < length && min[i] == max[i]; i++) ;
 346     for (j = length - 1; j >= 0 && min[j] == 0x00 && max[j] == 0xFF; j--) ;
 347     if (i < j)
 348         return -1;
 349     if (i > j)
 350         return i * 8;
 351     mask = min[i] ^ max[i];
 352     switch (mask) {
 353     case 0x01:
 354         j = 7;
 355         break;
 356     case 0x03:
 357         j = 6;
 358         break;
 359     case 0x07:
 360         j = 5;
 361         break;
 362     case 0x0F:
 363         j = 4;
 364         break;
 365     case 0x1F:
 366         j = 3;
 367         break;
 368     case 0x3F:
 369         j = 2;
 370         break;
 371     case 0x7F:
 372         j = 1;
 373         break;
 374     default:
 375         return -1;
 376     }
 377     if ((min[i] & mask) != 0 || (max[i] & mask) != mask)
 378         return -1;
 379     else
 380         return i * 8 + j;
 381 }
 382
 383 /*
 384  * Construct a prefix.
 385  */
 386 static int make_addressPrefix(IPAddressOrRange **result,
 387                               unsigned char *addr, const int prefixlen)
 388 {
 389     int bytelen = (prefixlen + 7) / 8, bitlen = prefixlen % 8;
 390     IPAddressOrRange *aor = IPAddressOrRange_new();
 391
 392     if (aor == NULL)
 393         return 0;
 394     aor->type = IPAddressOrRange_addressPrefix;
 395     if (aor->u.addressPrefix == NULL &&
 396         (aor->u.addressPrefix = ASN1_BIT_STRING_new()) == NULL)
 397         goto err;
 398     if (!ASN1_BIT_STRING_set(aor->u.addressPrefix, addr, bytelen))
 399         goto err;
 400     aor->u.addressPrefix->flags &= ~7;
 401     aor->u.addressPrefix->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 402     if (bitlen > 0) {
 403         aor->u.addressPrefix->data[bytelen - 1] &= ~(0xFF >> bitlen);
 404         aor->u.addressPrefix->flags |= 8 - bitlen;
 405     }
 406
 407     *result = aor;
 408     return 1;
 409
 410  err:
 411     IPAddressOrRange_free(aor);
 412     return 0;
 413 }
 414
 415 /*
 416  * Construct a range.  If it can be expressed as a prefix,
 417  * return a prefix instead.  Doing this here simplifies
 418  * the rest of the code considerably.
 419  */
 420 static int make_addressRange(IPAddressOrRange **result,
 421                              unsigned char *min,
 422                              unsigned char *max, const int length)
 423 {
 424     IPAddressOrRange *aor;
 425     int i, prefixlen;
 426
 427     if ((prefixlen = range_should_be_prefix(min, max, length)) >= 0)
 428         return make_addressPrefix(result, min, prefixlen);
 429
 430     if ((aor = IPAddressOrRange_new()) == NULL)
 431         return 0;
 432     aor->type = IPAddressOrRange_addressRange;
 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         if (f->addressFamily->length == keylen &&
 500             !memcmp(f->addressFamily->data, key, keylen))
 501             return f;
 502     }
 503
 504     if ((f = IPAddressFamily_new()) == NULL)
 505         goto err;
 506     if (f->ipAddressChoice == NULL &&
 507         (f->ipAddressChoice = IPAddressChoice_new()) == NULL)
 508         goto err;
 509     if (f->addressFamily == NULL &&
 510         (f->addressFamily = ASN1_OCTET_STRING_new()) == NULL)
 511         goto err;
 512     if (!ASN1_OCTET_STRING_set(f->addressFamily, key, keylen))
 513         goto err;
 514     if (!sk_IPAddressFamily_push(addr, f))
 515         goto err;
 516
 517     return f;
 518
 519  err:
 520     IPAddressFamily_free(f);
 521     return NULL;
 522 }
 523
 524 /*
 525  * Add an inheritance element.
 526  */
 527 int X509v3_addr_add_inherit(IPAddrBlocks *addr,
 528                             const unsigned afi, const unsigned *safi)
 529 {
 530     IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
 531     if (f == NULL ||
 532         f->ipAddressChoice == NULL ||
 533         (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
 534          f->ipAddressChoice->u.addressesOrRanges != NULL))
 535         return 0;
 536     if (f->ipAddressChoice->type == IPAddressChoice_inherit &&
 537         f->ipAddressChoice->u.inherit != NULL)
 538         return 1;
 539     if (f->ipAddressChoice->u.inherit == NULL &&
 540         (f->ipAddressChoice->u.inherit = ASN1_NULL_new()) == NULL)
 541         return 0;
 542     f->ipAddressChoice->type = IPAddressChoice_inherit;
 543     return 1;
 544 }
 545
 546 /*
 547  * Construct an IPAddressOrRange sequence, or return an existing one.
 548  */
 549 static IPAddressOrRanges *make_prefix_or_range(IPAddrBlocks *addr,
 550                                                const unsigned afi,
 551                                                const unsigned *safi)
 552 {
 553     IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
 554     IPAddressOrRanges *aors = NULL;
 555
 556     if (f == NULL ||
 557         f->ipAddressChoice == NULL ||
 558         (f->ipAddressChoice->type == IPAddressChoice_inherit &&
 559          f->ipAddressChoice->u.inherit != NULL))
 560         return NULL;
 561     if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges)
 562         aors = f->ipAddressChoice->u.addressesOrRanges;
 563     if (aors != NULL)
 564         return aors;
 565     if ((aors = sk_IPAddressOrRange_new_null()) == NULL)
 566         return NULL;
 567     switch (afi) {
 568     case IANA_AFI_IPV4:
 569         (void)sk_IPAddressOrRange_set_cmp_func(aors, v4IPAddressOrRange_cmp);
 570         break;
 571     case IANA_AFI_IPV6:
 572         (void)sk_IPAddressOrRange_set_cmp_func(aors, v6IPAddressOrRange_cmp);
 573         break;
 574     }
 575     f->ipAddressChoice->type = IPAddressChoice_addressesOrRanges;
 576     f->ipAddressChoice->u.addressesOrRanges = aors;
 577     return aors;
 578 }
 579
 580 /*
 581  * Add a prefix.
 582  */
 583 int X509v3_addr_add_prefix(IPAddrBlocks *addr,
 584                            const unsigned afi,
 585                            const unsigned *safi,
 586                            unsigned char *a, const int prefixlen)
 587 {
 588     IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
 589     IPAddressOrRange *aor;
 590     if (aors == NULL || !make_addressPrefix(&aor, a, prefixlen))
 591         return 0;
 592     if (sk_IPAddressOrRange_push(aors, aor))
 593         return 1;
 594     IPAddressOrRange_free(aor);
 595     return 0;
 596 }
 597
 598 /*
 599  * Add a range.
 600  */
 601 int X509v3_addr_add_range(IPAddrBlocks *addr,
 602                           const unsigned afi,
 603                           const unsigned *safi,
 604                           unsigned char *min, unsigned char *max)
 605 {
 606     IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
 607     IPAddressOrRange *aor;
 608     int length = length_from_afi(afi);
 609     if (aors == NULL)
 610         return 0;
 611     if (!make_addressRange(&aor, min, max, length))
 612         return 0;
 613     if (sk_IPAddressOrRange_push(aors, aor))
 614         return 1;
 615     IPAddressOrRange_free(aor);
 616     return 0;
 617 }
 618
 619 /*
 620  * Extract min and max values from an IPAddressOrRange.
 621  */
 622 static int extract_min_max(IPAddressOrRange *aor,
 623                            unsigned char *min, unsigned char *max, int length)
 624 {
 625     if (aor == NULL || min == NULL || max == NULL)
 626         return 0;
 627     switch (aor->type) {
 628     case IPAddressOrRange_addressPrefix:
 629         return (addr_expand(min, aor->u.addressPrefix, length, 0x00) &&
 630                 addr_expand(max, aor->u.addressPrefix, length, 0xFF));
 631     case IPAddressOrRange_addressRange:
 632         return (addr_expand(min, aor->u.addressRange->min, length, 0x00) &&
 633                 addr_expand(max, aor->u.addressRange->max, length, 0xFF));
 634     }
 635     return 0;
 636 }
 637
 638 /*
 639  * Public wrapper for extract_min_max().
 640  */
 641 int X509v3_addr_get_range(IPAddressOrRange *aor,
 642                           const unsigned afi,
 643                           unsigned char *min,
 644                           unsigned char *max, const int length)
 645 {
 646     int afi_length = length_from_afi(afi);
 647     if (aor == NULL || min == NULL || max == NULL ||
 648         afi_length == 0 || length < afi_length ||
 649         (aor->type != IPAddressOrRange_addressPrefix &&
 650          aor->type != IPAddressOrRange_addressRange) ||
 651         !extract_min_max(aor, min, max, afi_length))
 652         return 0;
 653
 654     return afi_length;
 655 }
 656
 657 /*
 658  * Sort comparison function for a sequence of IPAddressFamily.
 659  *
 660  * The last paragraph of RFC 3779 2.2.3.3 is slightly ambiguous about
 661  * the ordering: I can read it as meaning that IPv6 without a SAFI
 662  * comes before IPv4 with a SAFI, which seems pretty weird.  The
 663  * examples in appendix B suggest that the author intended the
 664  * null-SAFI rule to apply only within a single AFI, which is what I
 665  * would have expected and is what the following code implements.
 666  */
 667 static int IPAddressFamily_cmp(const IPAddressFamily *const *a_,
 668                                const IPAddressFamily *const *b_)
 669 {
 670     const ASN1_OCTET_STRING *a = (*a_)->addressFamily;
 671     const ASN1_OCTET_STRING *b = (*b_)->addressFamily;
 672     int len = ((a->length <= b->length) ? a->length : b->length);
 673     int cmp = memcmp(a->data, b->data, len);
 674     return cmp ? cmp : a->length - b->length;
 675 }
 676
 677 /*
 678  * Check whether an IPAddrBLocks is in canonical form.
 679  */
 680 int X509v3_addr_is_canonical(IPAddrBlocks *addr)
 681 {
 682     unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
 683     unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
 684     IPAddressOrRanges *aors;
 685     int i, j, k;
 686
 687     /*
 688      * Empty extension is canonical.
 689      */
 690     if (addr == NULL)
 691         return 1;
 692
 693     /*
 694      * Check whether the top-level list is in order.
 695      */
 696     for (i = 0; i < sk_IPAddressFamily_num(addr) - 1; i++) {
 697         const IPAddressFamily *a = sk_IPAddressFamily_value(addr, i);
 698         const IPAddressFamily *b = sk_IPAddressFamily_value(addr, i + 1);
 699         if (IPAddressFamily_cmp(&a, &b) >= 0)
 700             return 0;
 701     }
 702
 703     /*
 704      * Top level's ok, now check each address family.
 705      */
 706     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 707         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
 708         int length = length_from_afi(X509v3_addr_get_afi(f));
 709
 710         /*
 711          * Inheritance is canonical.  Anything other than inheritance or
 712          * a SEQUENCE OF IPAddressOrRange is an ASN.1 error or something.
 713          */
 714         if (f == NULL || f->ipAddressChoice == NULL)
 715             return 0;
 716         switch (f->ipAddressChoice->type) {
 717         case IPAddressChoice_inherit:
 718             continue;
 719         case IPAddressChoice_addressesOrRanges:
 720             break;
 721         default:
 722             return 0;
 723         }
 724
 725         /*
 726          * It's an IPAddressOrRanges sequence, check it.
 727          */
 728         aors = f->ipAddressChoice->u.addressesOrRanges;
 729         if (sk_IPAddressOrRange_num(aors) == 0)
 730             return 0;
 731         for (j = 0; j < sk_IPAddressOrRange_num(aors) - 1; j++) {
 732             IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
 733             IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, j + 1);
 734
 735             if (!extract_min_max(a, a_min, a_max, length) ||
 736                 !extract_min_max(b, b_min, b_max, length))
 737                 return 0;
 738
 739             /*
 740              * Punt misordered list, overlapping start, or inverted range.
 741              */
 742             if (memcmp(a_min, b_min, length) >= 0 ||
 743                 memcmp(a_min, a_max, length) > 0 ||
 744                 memcmp(b_min, b_max, length) > 0)
 745                 return 0;
 746
 747             /*
 748              * Punt if adjacent or overlapping.  Check for adjacency by
 749              * subtracting one from b_min first.
 750              */
 751             for (k = length - 1; k >= 0 && b_min[k]-- == 0x00; k--) ;
 752             if (memcmp(a_max, b_min, length) >= 0)
 753                 return 0;
 754
 755             /*
 756              * Check for range that should be expressed as a prefix.
 757              */
 758             if (a->type == IPAddressOrRange_addressRange &&
 759                 range_should_be_prefix(a_min, a_max, length) >= 0)
 760                 return 0;
 761         }
 762
 763         /*
 764          * Check range to see if it's inverted or should be a
 765          * prefix.
 766          */
 767         j = sk_IPAddressOrRange_num(aors) - 1;
 768         {
 769             IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
 770             if (a != NULL && a->type == IPAddressOrRange_addressRange) {
 771                 if (!extract_min_max(a, a_min, a_max, length))
 772                     return 0;
 773                 if (memcmp(a_min, a_max, length) > 0 ||
 774                     range_should_be_prefix(a_min, a_max, length) >= 0)
 775                     return 0;
 776             }
 777         }
 778     }
 779
 780     /*
 781      * If we made it through all that, we're happy.
 782      */
 783     return 1;
 784 }
 785
 786 /*
 787  * Whack an IPAddressOrRanges into canonical form.
 788  */
 789 static int IPAddressOrRanges_canonize(IPAddressOrRanges *aors,
 790                                       const unsigned afi)
 791 {
 792     int i, j, length = length_from_afi(afi);
 793
 794     /*
 795      * Sort the IPAddressOrRanges sequence.
 796      */
 797     sk_IPAddressOrRange_sort(aors);
 798
 799     /*
 800      * Clean up representation issues, punt on duplicates or overlaps.
 801      */
 802     for (i = 0; i < sk_IPAddressOrRange_num(aors) - 1; i++) {
 803         IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, i);
 804         IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, i + 1);
 805         unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
 806         unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
 807
 808         if (!extract_min_max(a, a_min, a_max, length) ||
 809             !extract_min_max(b, b_min, b_max, length))
 810             return 0;
 811
 812         /*
 813          * Punt inverted ranges.
 814          */
 815         if (memcmp(a_min, a_max, length) > 0 ||
 816             memcmp(b_min, b_max, length) > 0)
 817             return 0;
 818
 819         /*
 820          * Punt overlaps.
 821          */
 822         if (memcmp(a_max, b_min, length) >= 0)
 823             return 0;
 824
 825         /*
 826          * Merge if a and b are adjacent.  We check for
 827          * adjacency by subtracting one from b_min first.
 828          */
 829         for (j = length - 1; j >= 0 && b_min[j]-- == 0x00; j--) ;
 830         if (memcmp(a_max, b_min, length) == 0) {
 831             IPAddressOrRange *merged;
 832             if (!make_addressRange(&merged, a_min, b_max, length))
 833                 return 0;
 834             (void)sk_IPAddressOrRange_set(aors, i, merged);
 835             (void)sk_IPAddressOrRange_delete(aors, i + 1);
 836             IPAddressOrRange_free(a);
 837             IPAddressOrRange_free(b);
 838             --i;
 839             continue;
 840         }
 841     }
 842
 843     /*
 844      * Check for inverted final range.
 845      */
 846     j = sk_IPAddressOrRange_num(aors) - 1;
 847     {
 848         IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
 849         if (a != NULL && a->type == IPAddressOrRange_addressRange) {
 850             unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
 851             if (!extract_min_max(a, a_min, a_max, length))
 852                 return 0;
 853             if (memcmp(a_min, a_max, length) > 0)
 854                 return 0;
 855         }
 856     }
 857
 858     return 1;
 859 }
 860
 861 /*
 862  * Whack an IPAddrBlocks extension into canonical form.
 863  */
 864 int X509v3_addr_canonize(IPAddrBlocks *addr)
 865 {
 866     int i;
 867     for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
 868         IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
 869         if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
 870             !IPAddressOrRanges_canonize(f->ipAddressChoice->
 871                                         u.addressesOrRanges,
 872                                         X509v3_addr_get_afi(f)))
 873             return 0;
 874     }
 875     (void)sk_IPAddressFamily_set_cmp_func(addr, IPAddressFamily_cmp);
 876     sk_IPAddressFamily_sort(addr);
 877     if (!ossl_assert(X509v3_addr_is_canonical(addr)))
 878         return 0;
 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     if (!ossl_assert(chain != NULL && sk_X509_num(chain) > 0)
1184             || !ossl_assert(ctx != NULL || ext != NULL)
1185             || !ossl_assert(ctx == NULL || ctx->verify_cb != NULL)) {
1186         if (ctx != NULL)
1187             ctx->error = X509_V_ERR_UNSPECIFIED;
1188         return 0;
1189     }
1190
1191     /*
1192      * Figure out where to start.  If we don't have an extension to
1193      * check, we're done.  Otherwise, check canonical form and
1194      * set up for walking up the chain.
1195      */
1196     if (ext != NULL) {
1197         i = -1;
1198         x = NULL;
1199     } else {
1200         i = 0;
1201         x = sk_X509_value(chain, i);
1202         if ((ext = x->rfc3779_addr) == NULL)
1203             goto done;
1204     }
1205     if (!X509v3_addr_is_canonical(ext))
1206         validation_err(X509_V_ERR_INVALID_EXTENSION);
1207     (void)sk_IPAddressFamily_set_cmp_func(ext, IPAddressFamily_cmp);
1208     if ((child = sk_IPAddressFamily_dup(ext)) == NULL) {
1209         X509V3err(X509V3_F_ADDR_VALIDATE_PATH_INTERNAL,
1210                   ERR_R_MALLOC_FAILURE);
1211         if (ctx != NULL)
1212             ctx->error = X509_V_ERR_OUT_OF_MEM;
1213         ret = 0;
1214         goto done;
1215     }
1216
1217     /*
1218      * Now walk up the chain.  No cert may list resources that its
1219      * parent doesn't list.
1220      */
1221     for (i++; i < sk_X509_num(chain); i++) {
1222         x = sk_X509_value(chain, i);
1223         if (!X509v3_addr_is_canonical(x->rfc3779_addr))
1224             validation_err(X509_V_ERR_INVALID_EXTENSION);
1225         if (x->rfc3779_addr == NULL) {
1226             for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
1227                 IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
1228                 if (fc->ipAddressChoice->type != IPAddressChoice_inherit) {
1229                     validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1230                     break;
1231                 }
1232             }
1233             continue;
1234         }
1235         (void)sk_IPAddressFamily_set_cmp_func(x->rfc3779_addr,
1236                                               IPAddressFamily_cmp);
1237         for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
1238             IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
1239             int k = sk_IPAddressFamily_find(x->rfc3779_addr, fc);
1240             IPAddressFamily *fp =
1241                 sk_IPAddressFamily_value(x->rfc3779_addr, k);
1242             if (fp == NULL) {
1243                 if (fc->ipAddressChoice->type ==
1244                     IPAddressChoice_addressesOrRanges) {
1245                     validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1246                     break;
1247                 }
1248                 continue;
1249             }
1250             if (fp->ipAddressChoice->type ==
1251                 IPAddressChoice_addressesOrRanges) {
1252                 if (fc->ipAddressChoice->type == IPAddressChoice_inherit
1253                     || addr_contains(fp->ipAddressChoice->u.addressesOrRanges,
1254                                      fc->ipAddressChoice->u.addressesOrRanges,
1255                                      length_from_afi(X509v3_addr_get_afi(fc))))
1256                     sk_IPAddressFamily_set(child, j, fp);
1257                 else
1258                     validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1259             }
1260         }
1261     }
1262
1263     /*
1264      * Trust anchor can't inherit.
1265      */
1266     if (x->rfc3779_addr != NULL) {
1267         for (j = 0; j < sk_IPAddressFamily_num(x->rfc3779_addr); j++) {
1268             IPAddressFamily *fp =
1269                 sk_IPAddressFamily_value(x->rfc3779_addr, j);
1270             if (fp->ipAddressChoice->type == IPAddressChoice_inherit
1271                 && sk_IPAddressFamily_find(child, fp) >= 0)
1272                 validation_err(X509_V_ERR_UNNESTED_RESOURCE);
1273         }
1274     }
1275
1276  done:
1277     sk_IPAddressFamily_free(child);
1278     return ret;
1279 }
1280
1281 #undef validation_err
1282
1283 /*
1284  * RFC 3779 2.3 path validation -- called from X509_verify_cert().
1285  */
1286 int X509v3_addr_validate_path(X509_STORE_CTX *ctx)
1287 {
1288     if (ctx->chain == NULL
1289             || sk_X509_num(ctx->chain) == 0
1290             || ctx->verify_cb == NULL) {
1291         ctx->error = X509_V_ERR_UNSPECIFIED;
1292         return 0;
1293     }
1294     return addr_validate_path_internal(ctx, ctx->chain, NULL);
1295 }
1296
1297 /*
1298  * RFC 3779 2.3 path validation of an extension.
1299  * Test whether chain covers extension.
1300  */
1301 int X509v3_addr_validate_resource_set(STACK_OF(X509) *chain,
1302                                   IPAddrBlocks *ext, int allow_inheritance)
1303 {
1304     if (ext == NULL)
1305         return 1;
1306     if (chain == NULL || sk_X509_num(chain) == 0)
1307         return 0;
1308     if (!allow_inheritance && X509v3_addr_inherits(ext))
1309         return 0;
1310     return addr_validate_path_internal(NULL, chain, ext);
1311 }
1312
1313 #endif                          /* OPENSSL_NO_RFC3779 */