inital commit

1 files changed, 1350 insertions, 0 deletions

diff --git a/openssl/crypto/x509v3/v3_addr.c b/openssl/crypto/x509v3/v3_addr.c
new file mode 100644
index 0000000..1290dec
--- /dev/null
+++ b/openssl/crypto/x509v3/v3_addr.c
@@ -0,0 +1,1350 @@
+/*
+ * Contributed to the OpenSSL Project by the American Registry for
+ * Internet Numbers ("ARIN").
+ */
+/* ====================================================================
+ * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ */
+
+/*
+ * Implementation of RFC 3779 section 2.2.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "cryptlib.h"
+#include <openssl/conf.h>
+#include <openssl/asn1.h>
+#include <openssl/asn1t.h>
+#include <openssl/buffer.h>
+#include <openssl/x509v3.h>
+
+#ifndef OPENSSL_NO_RFC3779
+
+/*
+ * OpenSSL ASN.1 template translation of RFC 3779 2.2.3.
+ */
+
+ASN1_SEQUENCE(IPAddressRange) = {
+  ASN1_SIMPLE(IPAddressRange, min, ASN1_BIT_STRING),
+  ASN1_SIMPLE(IPAddressRange, max, ASN1_BIT_STRING)
+} ASN1_SEQUENCE_END(IPAddressRange)
+
+ASN1_CHOICE(IPAddressOrRange) = {
+  ASN1_SIMPLE(IPAddressOrRange, u.addressPrefix, ASN1_BIT_STRING),
+  ASN1_SIMPLE(IPAddressOrRange, u.addressRange,  IPAddressRange)
+} ASN1_CHOICE_END(IPAddressOrRange)
+
+ASN1_CHOICE(IPAddressChoice) = {
+  ASN1_SIMPLE(IPAddressChoice,      u.inherit,           ASN1_NULL),
+  ASN1_SEQUENCE_OF(IPAddressChoice, u.addressesOrRanges, IPAddressOrRange)
+} ASN1_CHOICE_END(IPAddressChoice)
+
+ASN1_SEQUENCE(IPAddressFamily) = {
+  ASN1_SIMPLE(IPAddressFamily, addressFamily,   ASN1_OCTET_STRING),
+  ASN1_SIMPLE(IPAddressFamily, ipAddressChoice, IPAddressChoice)
+} ASN1_SEQUENCE_END(IPAddressFamily)
+
+ASN1_ITEM_TEMPLATE(IPAddrBlocks) =
+  ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0,
+                        IPAddrBlocks, IPAddressFamily)
+ASN1_ITEM_TEMPLATE_END(IPAddrBlocks)
+
+IMPLEMENT_ASN1_FUNCTIONS(IPAddressRange)
+IMPLEMENT_ASN1_FUNCTIONS(IPAddressOrRange)
+IMPLEMENT_ASN1_FUNCTIONS(IPAddressChoice)
+IMPLEMENT_ASN1_FUNCTIONS(IPAddressFamily)
+
+/*
+ * How much buffer space do we need for a raw address?
+ */
+# define ADDR_RAW_BUF_LEN        16
+
+/*
+ * What's the address length associated with this AFI?
+ */
+static int length_from_afi(const unsigned afi)
+{
+    switch (afi) {
+    case IANA_AFI_IPV4:
+        return 4;
+    case IANA_AFI_IPV6:
+        return 16;
+    default:
+        return 0;
+    }
+}
+
+/*
+ * Extract the AFI from an IPAddressFamily.
+ */
+unsigned int v3_addr_get_afi(const IPAddressFamily *f)
+{
+    return ((f != NULL &&
+             f->addressFamily != NULL && f->addressFamily->data != NULL)
+            ? ((f->addressFamily->data[0] << 8) | (f->addressFamily->data[1]))
+            : 0);
+}
+
+/*
+ * Expand the bitstring form of an address into a raw byte array.
+ * At the moment this is coded for simplicity, not speed.
+ */
+static int addr_expand(unsigned char *addr,
+                       const ASN1_BIT_STRING *bs,
+                       const int length, const unsigned char fill)
+{
+    if (bs->length < 0 || bs->length > length)
+        return 0;
+    if (bs->length > 0) {
+        memcpy(addr, bs->data, bs->length);
+        if ((bs->flags & 7) != 0) {
+            unsigned char mask = 0xFF >> (8 - (bs->flags & 7));
+            if (fill == 0)
+                addr[bs->length - 1] &= ~mask;
+            else
+                addr[bs->length - 1] |= mask;
+        }
+    }
+    memset(addr + bs->length, fill, length - bs->length);
+    return 1;
+}
+
+/*
+ * Extract the prefix length from a bitstring.
+ */
+# define addr_prefixlen(bs) ((int) ((bs)->length * 8 - ((bs)->flags & 7)))
+
+/*
+ * i2r handler for one address bitstring.
+ */
+static int i2r_address(BIO *out,
+                       const unsigned afi,
+                       const unsigned char fill, const ASN1_BIT_STRING *bs)
+{
+    unsigned char addr[ADDR_RAW_BUF_LEN];
+    int i, n;
+
+    if (bs->length < 0)
+        return 0;
+    switch (afi) {
+    case IANA_AFI_IPV4:
+        if (!addr_expand(addr, bs, 4, fill))
+            return 0;
+        BIO_printf(out, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
+        break;
+    case IANA_AFI_IPV6:
+        if (!addr_expand(addr, bs, 16, fill))
+            return 0;
+        for (n = 16; n > 1 && addr[n - 1] == 0x00 && addr[n - 2] == 0x00;
+             n -= 2) ;
+        for (i = 0; i < n; i += 2)
+            BIO_printf(out, "%x%s", (addr[i] << 8) | addr[i + 1],
+                       (i < 14 ? ":" : ""));
+        if (i < 16)
+            BIO_puts(out, ":");
+        if (i == 0)
+            BIO_puts(out, ":");
+        break;
+    default:
+        for (i = 0; i < bs->length; i++)
+            BIO_printf(out, "%s%02x", (i > 0 ? ":" : ""), bs->data[i]);
+        BIO_printf(out, "[%d]", (int)(bs->flags & 7));
+        break;
+    }
+    return 1;
+}
+
+/*
+ * i2r handler for a sequence of addresses and ranges.
+ */
+static int i2r_IPAddressOrRanges(BIO *out,
+                                 const int indent,
+                                 const IPAddressOrRanges *aors,
+                                 const unsigned afi)
+{
+    int i;
+    for (i = 0; i < sk_IPAddressOrRange_num(aors); i++) {
+        const IPAddressOrRange *aor = sk_IPAddressOrRange_value(aors, i);
+        BIO_printf(out, "%*s", indent, "");
+        switch (aor->type) {
+        case IPAddressOrRange_addressPrefix:
+            if (!i2r_address(out, afi, 0x00, aor->u.addressPrefix))
+                return 0;
+            BIO_printf(out, "/%d\n", addr_prefixlen(aor->u.addressPrefix));
+            continue;
+        case IPAddressOrRange_addressRange:
+            if (!i2r_address(out, afi, 0x00, aor->u.addressRange->min))
+                return 0;
+            BIO_puts(out, "-");
+            if (!i2r_address(out, afi, 0xFF, aor->u.addressRange->max))
+                return 0;
+            BIO_puts(out, "\n");
+            continue;
+        }
+    }
+    return 1;
+}
+
+/*
+ * i2r handler for an IPAddrBlocks extension.
+ */
+static int i2r_IPAddrBlocks(const X509V3_EXT_METHOD *method,
+                            void *ext, BIO *out, int indent)
+{
+    const IPAddrBlocks *addr = ext;
+    int i;
+    for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
+        IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
+        const unsigned int afi = v3_addr_get_afi(f);
+        switch (afi) {
+        case IANA_AFI_IPV4:
+            BIO_printf(out, "%*sIPv4", indent, "");
+            break;
+        case IANA_AFI_IPV6:
+            BIO_printf(out, "%*sIPv6", indent, "");
+            break;
+        default:
+            BIO_printf(out, "%*sUnknown AFI %u", indent, "", afi);
+            break;
+        }
+        if (f->addressFamily->length > 2) {
+            switch (f->addressFamily->data[2]) {
+            case 1:
+                BIO_puts(out, " (Unicast)");
+                break;
+            case 2:
+                BIO_puts(out, " (Multicast)");
+                break;
+            case 3:
+                BIO_puts(out, " (Unicast/Multicast)");
+                break;
+            case 4:
+                BIO_puts(out, " (MPLS)");
+                break;
+            case 64:
+                BIO_puts(out, " (Tunnel)");
+                break;
+            case 65:
+                BIO_puts(out, " (VPLS)");
+                break;
+            case 66:
+                BIO_puts(out, " (BGP MDT)");
+                break;
+            case 128:
+                BIO_puts(out, " (MPLS-labeled VPN)");
+                break;
+            default:
+                BIO_printf(out, " (Unknown SAFI %u)",
+                           (unsigned)f->addressFamily->data[2]);
+                break;
+            }
+        }
+        switch (f->ipAddressChoice->type) {
+        case IPAddressChoice_inherit:
+            BIO_puts(out, ": inherit\n");
+            break;
+        case IPAddressChoice_addressesOrRanges:
+            BIO_puts(out, ":\n");
+            if (!i2r_IPAddressOrRanges(out,
+                                       indent + 2,
+                                       f->ipAddressChoice->
+                                       u.addressesOrRanges, afi))
+                return 0;
+            break;
+        }
+    }
+    return 1;
+}
+
+/*
+ * Sort comparison function for a sequence of IPAddressOrRange
+ * elements.
+ *
+ * There's no sane answer we can give if addr_expand() fails, and an
+ * assertion failure on externally supplied data is seriously uncool,
+ * so we just arbitrarily declare that if given invalid inputs this
+ * function returns -1.  If this messes up your preferred sort order
+ * for garbage input, tough noogies.
+ */
+static int IPAddressOrRange_cmp(const IPAddressOrRange *a,
+                                const IPAddressOrRange *b, const int length)
+{
+    unsigned char addr_a[ADDR_RAW_BUF_LEN], addr_b[ADDR_RAW_BUF_LEN];
+    int prefixlen_a = 0, prefixlen_b = 0;
+    int r;
+
+    switch (a->type) {
+    case IPAddressOrRange_addressPrefix:
+        if (!addr_expand(addr_a, a->u.addressPrefix, length, 0x00))
+            return -1;
+        prefixlen_a = addr_prefixlen(a->u.addressPrefix);
+        break;
+    case IPAddressOrRange_addressRange:
+        if (!addr_expand(addr_a, a->u.addressRange->min, length, 0x00))
+            return -1;
+        prefixlen_a = length * 8;
+        break;
+    }
+
+    switch (b->type) {
+    case IPAddressOrRange_addressPrefix:
+        if (!addr_expand(addr_b, b->u.addressPrefix, length, 0x00))
+            return -1;
+        prefixlen_b = addr_prefixlen(b->u.addressPrefix);
+        break;
+    case IPAddressOrRange_addressRange:
+        if (!addr_expand(addr_b, b->u.addressRange->min, length, 0x00))
+            return -1;
+        prefixlen_b = length * 8;
+        break;
+    }
+
+    if ((r = memcmp(addr_a, addr_b, length)) != 0)
+        return r;
+    else
+        return prefixlen_a - prefixlen_b;
+}
+
+/*
+ * IPv4-specific closure over IPAddressOrRange_cmp, since sk_sort()
+ * comparision routines are only allowed two arguments.
+ */
+static int v4IPAddressOrRange_cmp(const IPAddressOrRange *const *a,
+                                  const IPAddressOrRange *const *b)
+{
+    return IPAddressOrRange_cmp(*a, *b, 4);
+}
+
+/*
+ * IPv6-specific closure over IPAddressOrRange_cmp, since sk_sort()
+ * comparision routines are only allowed two arguments.
+ */
+static int v6IPAddressOrRange_cmp(const IPAddressOrRange *const *a,
+                                  const IPAddressOrRange *const *b)
+{
+    return IPAddressOrRange_cmp(*a, *b, 16);
+}
+
+/*
+ * Calculate whether a range collapses to a prefix.
+ * See last paragraph of RFC 3779 2.2.3.7.
+ */
+static int range_should_be_prefix(const unsigned char *min,
+                                  const unsigned char *max, const int length)
+{
+    unsigned char mask;
+    int i, j;
+
+    OPENSSL_assert(memcmp(min, max, length) <= 0);
+    for (i = 0; i < length && min[i] == max[i]; i++) ;
+    for (j = length - 1; j >= 0 && min[j] == 0x00 && max[j] == 0xFF; j--) ;
+    if (i < j)
+        return -1;
+    if (i > j)
+        return i * 8;
+    mask = min[i] ^ max[i];
+    switch (mask) {
+    case 0x01:
+        j = 7;
+        break;
+    case 0x03:
+        j = 6;
+        break;
+    case 0x07:
+        j = 5;
+        break;
+    case 0x0F:
+        j = 4;
+        break;
+    case 0x1F:
+        j = 3;
+        break;
+    case 0x3F:
+        j = 2;
+        break;
+    case 0x7F:
+        j = 1;
+        break;
+    default:
+        return -1;
+    }
+    if ((min[i] & mask) != 0 || (max[i] & mask) != mask)
+        return -1;
+    else
+        return i * 8 + j;
+}
+
+/*
+ * Construct a prefix.
+ */
+static int make_addressPrefix(IPAddressOrRange **result,
+                              unsigned char *addr, const int prefixlen)
+{
+    int bytelen = (prefixlen + 7) / 8, bitlen = prefixlen % 8;
+    IPAddressOrRange *aor = IPAddressOrRange_new();
+
+    if (aor == NULL)
+        return 0;
+    aor->type = IPAddressOrRange_addressPrefix;
+    if (aor->u.addressPrefix == NULL &&
+        (aor->u.addressPrefix = ASN1_BIT_STRING_new()) == NULL)
+        goto err;
+    if (!ASN1_BIT_STRING_set(aor->u.addressPrefix, addr, bytelen))
+        goto err;
+    aor->u.addressPrefix->flags &= ~7;
+    aor->u.addressPrefix->flags |= ASN1_STRING_FLAG_BITS_LEFT;
+    if (bitlen > 0) {
+        aor->u.addressPrefix->data[bytelen - 1] &= ~(0xFF >> bitlen);
+        aor->u.addressPrefix->flags |= 8 - bitlen;
+    }
+
+    *result = aor;
+    return 1;
+
+ err:
+    IPAddressOrRange_free(aor);
+    return 0;
+}
+
+/*
+ * Construct a range.  If it can be expressed as a prefix,
+ * return a prefix instead.  Doing this here simplifies
+ * the rest of the code considerably.
+ */
+static int make_addressRange(IPAddressOrRange **result,
+                             unsigned char *min,
+                             unsigned char *max, const int length)
+{
+    IPAddressOrRange *aor;
+    int i, prefixlen;
+
+    if ((prefixlen = range_should_be_prefix(min, max, length)) >= 0)
+        return make_addressPrefix(result, min, prefixlen);
+
+    if ((aor = IPAddressOrRange_new()) == NULL)
+        return 0;
+    aor->type = IPAddressOrRange_addressRange;
+    OPENSSL_assert(aor->u.addressRange == NULL);
+    if ((aor->u.addressRange = IPAddressRange_new()) == NULL)
+        goto err;
+    if (aor->u.addressRange->min == NULL &&
+        (aor->u.addressRange->min = ASN1_BIT_STRING_new()) == NULL)
+        goto err;
+    if (aor->u.addressRange->max == NULL &&
+        (aor->u.addressRange->max = ASN1_BIT_STRING_new()) == NULL)
+        goto err;
+
+    for (i = length; i > 0 && min[i - 1] == 0x00; --i) ;
+    if (!ASN1_BIT_STRING_set(aor->u.addressRange->min, min, i))
+        goto err;
+    aor->u.addressRange->min->flags &= ~7;
+    aor->u.addressRange->min->flags |= ASN1_STRING_FLAG_BITS_LEFT;
+    if (i > 0) {
+        unsigned char b = min[i - 1];
+        int j = 1;
+        while ((b & (0xFFU >> j)) != 0)
+            ++j;
+        aor->u.addressRange->min->flags |= 8 - j;
+    }
+
+    for (i = length; i > 0 && max[i - 1] == 0xFF; --i) ;
+    if (!ASN1_BIT_STRING_set(aor->u.addressRange->max, max, i))
+        goto err;
+    aor->u.addressRange->max->flags &= ~7;
+    aor->u.addressRange->max->flags |= ASN1_STRING_FLAG_BITS_LEFT;
+    if (i > 0) {
+        unsigned char b = max[i - 1];
+        int j = 1;
+        while ((b & (0xFFU >> j)) != (0xFFU >> j))
+            ++j;
+        aor->u.addressRange->max->flags |= 8 - j;
+    }
+
+    *result = aor;
+    return 1;
+
+ err:
+    IPAddressOrRange_free(aor);
+    return 0;
+}
+
+/*
+ * Construct a new address family or find an existing one.
+ */
+static IPAddressFamily *make_IPAddressFamily(IPAddrBlocks *addr,
+                                             const unsigned afi,
+                                             const unsigned *safi)
+{
+    IPAddressFamily *f;
+    unsigned char key[3];
+    unsigned keylen;
+    int i;
+
+    key[0] = (afi >> 8) & 0xFF;
+    key[1] = afi & 0xFF;
+    if (safi != NULL) {
+        key[2] = *safi & 0xFF;
+        keylen = 3;
+    } else {
+        keylen = 2;
+    }
+
+    for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
+        f = sk_IPAddressFamily_value(addr, i);
+        OPENSSL_assert(f->addressFamily->data != NULL);
+        if (f->addressFamily->length == keylen &&
+            !memcmp(f->addressFamily->data, key, keylen))
+            return f;
+    }
+
+    if ((f = IPAddressFamily_new()) == NULL)
+        goto err;
+    if (f->ipAddressChoice == NULL &&
+        (f->ipAddressChoice = IPAddressChoice_new()) == NULL)
+        goto err;
+    if (f->addressFamily == NULL &&
+        (f->addressFamily = ASN1_OCTET_STRING_new()) == NULL)
+        goto err;
+    if (!ASN1_OCTET_STRING_set(f->addressFamily, key, keylen))
+        goto err;
+    if (!sk_IPAddressFamily_push(addr, f))
+        goto err;
+
+    return f;
+
+ err:
+    IPAddressFamily_free(f);
+    return NULL;
+}
+
+/*
+ * Add an inheritance element.
+ */
+int v3_addr_add_inherit(IPAddrBlocks *addr,
+                        const unsigned afi, const unsigned *safi)
+{
+    IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
+    if (f == NULL ||
+        f->ipAddressChoice == NULL ||
+        (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
+         f->ipAddressChoice->u.addressesOrRanges != NULL))
+        return 0;
+    if (f->ipAddressChoice->type == IPAddressChoice_inherit &&
+        f->ipAddressChoice->u.inherit != NULL)
+        return 1;
+    if (f->ipAddressChoice->u.inherit == NULL &&
+        (f->ipAddressChoice->u.inherit = ASN1_NULL_new()) == NULL)
+        return 0;
+    f->ipAddressChoice->type = IPAddressChoice_inherit;
+    return 1;
+}
+
+/*
+ * Construct an IPAddressOrRange sequence, or return an existing one.
+ */
+static IPAddressOrRanges *make_prefix_or_range(IPAddrBlocks *addr,
+                                               const unsigned afi,
+                                               const unsigned *safi)
+{
+    IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
+    IPAddressOrRanges *aors = NULL;
+
+    if (f == NULL ||
+        f->ipAddressChoice == NULL ||
+        (f->ipAddressChoice->type == IPAddressChoice_inherit &&
+         f->ipAddressChoice->u.inherit != NULL))
+        return NULL;
+    if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges)
+        aors = f->ipAddressChoice->u.addressesOrRanges;
+    if (aors != NULL)
+        return aors;
+    if ((aors = sk_IPAddressOrRange_new_null()) == NULL)
+        return NULL;
+    switch (afi) {
+    case IANA_AFI_IPV4:
+        (void)sk_IPAddressOrRange_set_cmp_func(aors, v4IPAddressOrRange_cmp);
+        break;
+    case IANA_AFI_IPV6:
+        (void)sk_IPAddressOrRange_set_cmp_func(aors, v6IPAddressOrRange_cmp);
+        break;
+    }
+    f->ipAddressChoice->type = IPAddressChoice_addressesOrRanges;
+    f->ipAddressChoice->u.addressesOrRanges = aors;
+    return aors;
+}
+
+/*
+ * Add a prefix.
+ */
+int v3_addr_add_prefix(IPAddrBlocks *addr,
+                       const unsigned afi,
+                       const unsigned *safi,
+                       unsigned char *a, const int prefixlen)
+{
+    IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
+    IPAddressOrRange *aor;
+    if (aors == NULL || !make_addressPrefix(&aor, a, prefixlen))
+        return 0;
+    if (sk_IPAddressOrRange_push(aors, aor))
+        return 1;
+    IPAddressOrRange_free(aor);
+    return 0;
+}
+
+/*
+ * Add a range.
+ */
+int v3_addr_add_range(IPAddrBlocks *addr,
+                      const unsigned afi,
+                      const unsigned *safi,
+                      unsigned char *min, unsigned char *max)
+{
+    IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
+    IPAddressOrRange *aor;
+    int length = length_from_afi(afi);
+    if (aors == NULL)
+        return 0;
+    if (!make_addressRange(&aor, min, max, length))
+        return 0;
+    if (sk_IPAddressOrRange_push(aors, aor))
+        return 1;
+    IPAddressOrRange_free(aor);
+    return 0;
+}
+
+/*
+ * Extract min and max values from an IPAddressOrRange.
+ */
+static int extract_min_max(IPAddressOrRange *aor,
+                           unsigned char *min, unsigned char *max, int length)
+{
+    if (aor == NULL || min == NULL || max == NULL)
+        return 0;
+    switch (aor->type) {
+    case IPAddressOrRange_addressPrefix:
+        return (addr_expand(min, aor->u.addressPrefix, length, 0x00) &&
+                addr_expand(max, aor->u.addressPrefix, length, 0xFF));
+    case IPAddressOrRange_addressRange:
+        return (addr_expand(min, aor->u.addressRange->min, length, 0x00) &&
+                addr_expand(max, aor->u.addressRange->max, length, 0xFF));
+    }
+    return 0;
+}
+
+/*
+ * Public wrapper for extract_min_max().
+ */
+int v3_addr_get_range(IPAddressOrRange *aor,
+                      const unsigned afi,
+                      unsigned char *min,
+                      unsigned char *max, const int length)
+{
+    int afi_length = length_from_afi(afi);
+    if (aor == NULL || min == NULL || max == NULL ||
+        afi_length == 0 || length < afi_length ||
+        (aor->type != IPAddressOrRange_addressPrefix &&
+         aor->type != IPAddressOrRange_addressRange) ||
+        !extract_min_max(aor, min, max, afi_length))
+        return 0;
+
+    return afi_length;
+}
+
+/*
+ * Sort comparision function for a sequence of IPAddressFamily.
+ *
+ * The last paragraph of RFC 3779 2.2.3.3 is slightly ambiguous about
+ * the ordering: I can read it as meaning that IPv6 without a SAFI
+ * comes before IPv4 with a SAFI, which seems pretty weird.  The
+ * examples in appendix B suggest that the author intended the
+ * null-SAFI rule to apply only within a single AFI, which is what I
+ * would have expected and is what the following code implements.
+ */
+static int IPAddressFamily_cmp(const IPAddressFamily *const *a_,
+                               const IPAddressFamily *const *b_)
+{
+    const ASN1_OCTET_STRING *a = (*a_)->addressFamily;
+    const ASN1_OCTET_STRING *b = (*b_)->addressFamily;
+    int len = ((a->length <= b->length) ? a->length : b->length);
+    int cmp = memcmp(a->data, b->data, len);
+    return cmp ? cmp : a->length - b->length;
+}
+
+/*
+ * Check whether an IPAddrBLocks is in canonical form.
+ */
+int v3_addr_is_canonical(IPAddrBlocks *addr)
+{
+    unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
+    unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
+    IPAddressOrRanges *aors;
+    int i, j, k;
+
+    /*
+     * Empty extension is cannonical.
+     */
+    if (addr == NULL)
+        return 1;
+
+    /*
+     * Check whether the top-level list is in order.
+     */
+    for (i = 0; i < sk_IPAddressFamily_num(addr) - 1; i++) {
+        const IPAddressFamily *a = sk_IPAddressFamily_value(addr, i);
+        const IPAddressFamily *b = sk_IPAddressFamily_value(addr, i + 1);
+        if (IPAddressFamily_cmp(&a, &b) >= 0)
+            return 0;
+    }
+
+    /*
+     * Top level's ok, now check each address family.
+     */
+    for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
+        IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
+        int length = length_from_afi(v3_addr_get_afi(f));
+
+        /*
+         * Inheritance is canonical.  Anything other than inheritance or
+         * a SEQUENCE OF IPAddressOrRange is an ASN.1 error or something.
+         */
+        if (f == NULL || f->ipAddressChoice == NULL)
+            return 0;
+        switch (f->ipAddressChoice->type) {
+        case IPAddressChoice_inherit:
+            continue;
+        case IPAddressChoice_addressesOrRanges:
+            break;
+        default:
+            return 0;
+        }
+
+        /*
+         * It's an IPAddressOrRanges sequence, check it.
+         */
+        aors = f->ipAddressChoice->u.addressesOrRanges;
+        if (sk_IPAddressOrRange_num(aors) == 0)
+            return 0;
+        for (j = 0; j < sk_IPAddressOrRange_num(aors) - 1; j++) {
+            IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
+            IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, j + 1);
+
+            if (!extract_min_max(a, a_min, a_max, length) ||
+                !extract_min_max(b, b_min, b_max, length))
+                return 0;
+
+            /*
+             * Punt misordered list, overlapping start, or inverted range.
+             */
+            if (memcmp(a_min, b_min, length) >= 0 ||
+                memcmp(a_min, a_max, length) > 0 ||
+                memcmp(b_min, b_max, length) > 0)
+                return 0;
+
+            /*
+             * Punt if adjacent or overlapping.  Check for adjacency by
+             * subtracting one from b_min first.
+             */
+            for (k = length - 1; k >= 0 && b_min[k]-- == 0x00; k--) ;
+            if (memcmp(a_max, b_min, length) >= 0)
+                return 0;
+
+            /*
+             * Check for range that should be expressed as a prefix.
+             */
+            if (a->type == IPAddressOrRange_addressRange &&
+                range_should_be_prefix(a_min, a_max, length) >= 0)
+                return 0;
+        }
+
+        /*
+         * Check range to see if it's inverted or should be a
+         * prefix.
+         */
+        j = sk_IPAddressOrRange_num(aors) - 1;
+        {
+            IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
+            if (a != NULL && a->type == IPAddressOrRange_addressRange) {
+                if (!extract_min_max(a, a_min, a_max, length))
+                    return 0;
+                if (memcmp(a_min, a_max, length) > 0 ||
+                    range_should_be_prefix(a_min, a_max, length) >= 0)
+                    return 0;
+            }
+        }
+    }
+
+    /*
+     * If we made it through all that, we're happy.
+     */
+    return 1;
+}
+
+/*
+ * Whack an IPAddressOrRanges into canonical form.
+ */
+static int IPAddressOrRanges_canonize(IPAddressOrRanges *aors,
+                                      const unsigned afi)
+{
+    int i, j, length = length_from_afi(afi);
+
+    /*
+     * Sort the IPAddressOrRanges sequence.
+     */
+    sk_IPAddressOrRange_sort(aors);
+
+    /*
+     * Clean up representation issues, punt on duplicates or overlaps.
+     */
+    for (i = 0; i < sk_IPAddressOrRange_num(aors) - 1; i++) {
+        IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, i);
+        IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, i + 1);
+        unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
+        unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
+
+        if (!extract_min_max(a, a_min, a_max, length) ||
+            !extract_min_max(b, b_min, b_max, length))
+            return 0;
+
+        /*
+         * Punt inverted ranges.
+         */
+        if (memcmp(a_min, a_max, length) > 0 ||
+            memcmp(b_min, b_max, length) > 0)
+            return 0;
+
+        /*
+         * Punt overlaps.
+         */
+        if (memcmp(a_max, b_min, length) >= 0)
+            return 0;
+
+        /*
+         * Merge if a and b are adjacent.  We check for
+         * adjacency by subtracting one from b_min first.
+         */
+        for (j = length - 1; j >= 0 && b_min[j]-- == 0x00; j--) ;
+        if (memcmp(a_max, b_min, length) == 0) {
+            IPAddressOrRange *merged;
+            if (!make_addressRange(&merged, a_min, b_max, length))
+                return 0;
+            (void)sk_IPAddressOrRange_set(aors, i, merged);
+            (void)sk_IPAddressOrRange_delete(aors, i + 1);
+            IPAddressOrRange_free(a);
+            IPAddressOrRange_free(b);
+            --i;
+            continue;
+        }
+    }
+
+    /*
+     * Check for inverted final range.
+     */
+    j = sk_IPAddressOrRange_num(aors) - 1;
+    {
+        IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
+        if (a != NULL && a->type == IPAddressOrRange_addressRange) {
+            unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
+            extract_min_max(a, a_min, a_max, length);
+            if (memcmp(a_min, a_max, length) > 0)
+                return 0;
+        }
+    }
+
+    return 1;
+}
+
+/*
+ * Whack an IPAddrBlocks extension into canonical form.
+ */
+int v3_addr_canonize(IPAddrBlocks *addr)
+{
+    int i;
+    for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
+        IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
+        if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
+            !IPAddressOrRanges_canonize(f->ipAddressChoice->
+                                        u.addressesOrRanges,
+                                        v3_addr_get_afi(f)))
+            return 0;
+    }
+    (void)sk_IPAddressFamily_set_cmp_func(addr, IPAddressFamily_cmp);
+    sk_IPAddressFamily_sort(addr);
+    OPENSSL_assert(v3_addr_is_canonical(addr));
+    return 1;
+}
+
+/*
+ * v2i handler for the IPAddrBlocks extension.
+ */
+static void *v2i_IPAddrBlocks(const struct v3_ext_method *method,
+                              struct v3_ext_ctx *ctx,
+                              STACK_OF(CONF_VALUE) *values)
+{
+    static const char v4addr_chars[] = "0123456789.";
+    static const char v6addr_chars[] = "0123456789.:abcdefABCDEF";
+    IPAddrBlocks *addr = NULL;
+    char *s = NULL, *t;
+    int i;
+
+    if ((addr = sk_IPAddressFamily_new(IPAddressFamily_cmp)) == NULL) {
+        X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
+        return NULL;
+    }
+
+    for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
+        CONF_VALUE *val = sk_CONF_VALUE_value(values, i);
+        unsigned char min[ADDR_RAW_BUF_LEN], max[ADDR_RAW_BUF_LEN];
+        unsigned afi, *safi = NULL, safi_;
+        const char *addr_chars;
+        int prefixlen, i1, i2, delim, length;
+
+        if (!name_cmp(val->name, "IPv4")) {
+            afi = IANA_AFI_IPV4;
+        } else if (!name_cmp(val->name, "IPv6")) {
+            afi = IANA_AFI_IPV6;
+        } else if (!name_cmp(val->name, "IPv4-SAFI")) {
+            afi = IANA_AFI_IPV4;
+            safi = &safi_;
+        } else if (!name_cmp(val->name, "IPv6-SAFI")) {
+            afi = IANA_AFI_IPV6;
+            safi = &safi_;
+        } else {
+            X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
+                      X509V3_R_EXTENSION_NAME_ERROR);
+            X509V3_conf_err(val);
+            goto err;
+        }
+
+        switch (afi) {
+        case IANA_AFI_IPV4:
+            addr_chars = v4addr_chars;
+            break;
+        case IANA_AFI_IPV6:
+            addr_chars = v6addr_chars;
+            break;
+        }
+
+        length = length_from_afi(afi);
+
+        /*
+         * Handle SAFI, if any, and BUF_strdup() so we can null-terminate
+         * the other input values.
+         */
+        if (safi != NULL) {
+            *safi = strtoul(val->value, &t, 0);
+            t += strspn(t, " \t");
+            if (*safi > 0xFF || *t++ != ':') {
+                X509V3err(X509V3_F_V2I_IPADDRBLOCKS, X509V3_R_INVALID_SAFI);
+                X509V3_conf_err(val);
+                goto err;
+            }
+            t += strspn(t, " \t");
+            s = BUF_strdup(t);
+        } else {
+            s = BUF_strdup(val->value);
+        }
+        if (s == NULL) {
+            X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
+            goto err;
+        }
+
+        /*
+         * Check for inheritance.  Not worth additional complexity to
+         * optimize this (seldom-used) case.
+         */
+        if (!strcmp(s, "inherit")) {
+            if (!v3_addr_add_inherit(addr, afi, safi)) {
+                X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
+                          X509V3_R_INVALID_INHERITANCE);
+                X509V3_conf_err(val);
+                goto err;
+            }
+            OPENSSL_free(s);
+            s = NULL;
+            continue;
+        }
+
+        i1 = strspn(s, addr_chars);
+        i2 = i1 + strspn(s + i1, " \t");
+        delim = s[i2++];
+        s[i1] = '\0';
+
+        if (a2i_ipadd(min, s) != length) {
+            X509V3err(X509V3_F_V2I_IPADDRBLOCKS, X509V3_R_INVALID_IPADDRESS);
+            X509V3_conf_err(val);
+            goto err;
+        }
+
+        switch (delim) {
+        case '/':
+            prefixlen = (int)strtoul(s + i2, &t, 10);
+            if (t == s + i2 || *t != '\0') {
+                X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
+                          X509V3_R_EXTENSION_VALUE_ERROR);
+                X509V3_conf_err(val);
+                goto err;
+            }
+            if (!v3_addr_add_prefix(addr, afi, safi, min, prefixlen)) {
+                X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
+                goto err;
+            }
+            break;
+        case '-':
+            i1 = i2 + strspn(s + i2, " \t");
+            i2 = i1 + strspn(s + i1, addr_chars);
+            if (i1 == i2 || s[i2] != '\0') {
+                X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
+                          X509V3_R_EXTENSION_VALUE_ERROR);
+                X509V3_conf_err(val);
+                goto err;
+            }
+            if (a2i_ipadd(max, s + i1) != length) {
+                X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
+                          X509V3_R_INVALID_IPADDRESS);
+                X509V3_conf_err(val);
+                goto err;
+            }
+            if (memcmp(min, max, length_from_afi(afi)) > 0) {
+                X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
+                          X509V3_R_EXTENSION_VALUE_ERROR);
+                X509V3_conf_err(val);
+                goto err;
+            }
+            if (!v3_addr_add_range(addr, afi, safi, min, max)) {
+                X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
+                goto err;
+            }
+            break;
+        case '\0':
+            if (!v3_addr_add_prefix(addr, afi, safi, min, length * 8)) {
+                X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
+                goto err;
+            }
+            break;
+        default:
+            X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
+                      X509V3_R_EXTENSION_VALUE_ERROR);
+            X509V3_conf_err(val);
+            goto err;
+        }
+
+        OPENSSL_free(s);
+        s = NULL;
+    }
+
+    /*
+     * Canonize the result, then we're done.
+     */
+    if (!v3_addr_canonize(addr))
+        goto err;
+    return addr;
+
+ err:
+    OPENSSL_free(s);
+    sk_IPAddressFamily_pop_free(addr, IPAddressFamily_free);
+    return NULL;
+}
+
+/*
+ * OpenSSL dispatch
+ */
+const X509V3_EXT_METHOD v3_addr = {
+    NID_sbgp_ipAddrBlock,       /* nid */
+    0,                          /* flags */
+    ASN1_ITEM_ref(IPAddrBlocks), /* template */
+    0, 0, 0, 0,                 /* old functions, ignored */
+    0,                          /* i2s */
+    0,                          /* s2i */
+    0,                          /* i2v */
+    v2i_IPAddrBlocks,           /* v2i */
+    i2r_IPAddrBlocks,           /* i2r */
+    0,                          /* r2i */
+    NULL                        /* extension-specific data */
+};
+
+/*
+ * Figure out whether extension sues inheritance.
+ */
+int v3_addr_inherits(IPAddrBlocks *addr)
+{
+    int i;
+    if (addr == NULL)
+        return 0;
+    for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
+        IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
+        if (f->ipAddressChoice->type == IPAddressChoice_inherit)
+            return 1;
+    }
+    return 0;
+}
+
+/*
+ * Figure out whether parent contains child.
+ */
+static int addr_contains(IPAddressOrRanges *parent,
+                         IPAddressOrRanges *child, int length)
+{
+    unsigned char p_min[ADDR_RAW_BUF_LEN], p_max[ADDR_RAW_BUF_LEN];
+    unsigned char c_min[ADDR_RAW_BUF_LEN], c_max[ADDR_RAW_BUF_LEN];
+    int p, c;
+
+    if (child == NULL || parent == child)
+        return 1;
+    if (parent == NULL)
+        return 0;
+
+    p = 0;
+    for (c = 0; c < sk_IPAddressOrRange_num(child); c++) {
+        if (!extract_min_max(sk_IPAddressOrRange_value(child, c),
+                             c_min, c_max, length))
+            return -1;
+        for (;; p++) {
+            if (p >= sk_IPAddressOrRange_num(parent))
+                return 0;
+            if (!extract_min_max(sk_IPAddressOrRange_value(parent, p),
+                                 p_min, p_max, length))
+                return 0;
+            if (memcmp(p_max, c_max, length) < 0)
+                continue;
+            if (memcmp(p_min, c_min, length) > 0)
+                return 0;
+            break;
+        }
+    }
+
+    return 1;
+}
+
+/*
+ * Test whether a is a subset of b.
+ */
+int v3_addr_subset(IPAddrBlocks *a, IPAddrBlocks *b)
+{
+    int i;
+    if (a == NULL || a == b)
+        return 1;
+    if (b == NULL || v3_addr_inherits(a) || v3_addr_inherits(b))
+        return 0;
+    (void)sk_IPAddressFamily_set_cmp_func(b, IPAddressFamily_cmp);
+    for (i = 0; i < sk_IPAddressFamily_num(a); i++) {
+        IPAddressFamily *fa = sk_IPAddressFamily_value(a, i);
+        int j = sk_IPAddressFamily_find(b, fa);
+        IPAddressFamily *fb;
+        fb = sk_IPAddressFamily_value(b, j);
+        if (fb == NULL)
+            return 0;
+        if (!addr_contains(fb->ipAddressChoice->u.addressesOrRanges,
+                           fa->ipAddressChoice->u.addressesOrRanges,
+                           length_from_afi(v3_addr_get_afi(fb))))
+            return 0;
+    }
+    return 1;
+}
+
+/*
+ * Validation error handling via callback.
+ */
+# define validation_err(_err_)           \
+  do {                                  \
+    if (ctx != NULL) {                  \
+      ctx->error = _err_;               \
+      ctx->error_depth = i;             \
+      ctx->current_cert = x;            \
+      ret = ctx->verify_cb(0, ctx);     \
+    } else {                            \
+      ret = 0;                          \
+    }                                   \
+    if (!ret)                           \
+      goto done;                        \
+  } while (0)
+
+/*
+ * Core code for RFC 3779 2.3 path validation.
+ *
+ * Returns 1 for success, 0 on error.
+ *
+ * When returning 0, ctx->error MUST be set to an appropriate value other than
+ * X509_V_OK.
+ */
+static int v3_addr_validate_path_internal(X509_STORE_CTX *ctx,
+                                          STACK_OF(X509) *chain,
+                                          IPAddrBlocks *ext)
+{
+    IPAddrBlocks *child = NULL;
+    int i, j, ret = 1;
+    X509 *x;
+
+    OPENSSL_assert(chain != NULL && sk_X509_num(chain) > 0);
+    OPENSSL_assert(ctx != NULL || ext != NULL);
+    OPENSSL_assert(ctx == NULL || ctx->verify_cb != NULL);
+
+    /*
+     * Figure out where to start.  If we don't have an extension to
+     * check, we're done.  Otherwise, check canonical form and
+     * set up for walking up the chain.
+     */
+    if (ext != NULL) {
+        i = -1;
+        x = NULL;
+    } else {
+        i = 0;
+        x = sk_X509_value(chain, i);
+        OPENSSL_assert(x != NULL);
+        if ((ext = x->rfc3779_addr) == NULL)
+            goto done;
+    }
+    if (!v3_addr_is_canonical(ext))
+        validation_err(X509_V_ERR_INVALID_EXTENSION);
+    (void)sk_IPAddressFamily_set_cmp_func(ext, IPAddressFamily_cmp);
+    if ((child = sk_IPAddressFamily_dup(ext)) == NULL) {
+        X509V3err(X509V3_F_V3_ADDR_VALIDATE_PATH_INTERNAL,
+                  ERR_R_MALLOC_FAILURE);
+        ctx->error = X509_V_ERR_OUT_OF_MEM;
+        ret = 0;
+        goto done;
+    }
+
+    /*
+     * Now walk up the chain.  No cert may list resources that its
+     * parent doesn't list.
+     */
+    for (i++; i < sk_X509_num(chain); i++) {
+        x = sk_X509_value(chain, i);
+        OPENSSL_assert(x != NULL);
+        if (!v3_addr_is_canonical(x->rfc3779_addr))
+            validation_err(X509_V_ERR_INVALID_EXTENSION);
+        if (x->rfc3779_addr == NULL) {
+            for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
+                IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
+                if (fc->ipAddressChoice->type != IPAddressChoice_inherit) {
+                    validation_err(X509_V_ERR_UNNESTED_RESOURCE);
+                    break;
+                }
+            }
+            continue;
+        }
+        (void)sk_IPAddressFamily_set_cmp_func(x->rfc3779_addr,
+                                              IPAddressFamily_cmp);
+        for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
+            IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
+            int k = sk_IPAddressFamily_find(x->rfc3779_addr, fc);
+            IPAddressFamily *fp =
+                sk_IPAddressFamily_value(x->rfc3779_addr, k);
+            if (fp == NULL) {
+                if (fc->ipAddressChoice->type ==
+                    IPAddressChoice_addressesOrRanges) {
+                    validation_err(X509_V_ERR_UNNESTED_RESOURCE);
+                    break;
+                }
+                continue;
+            }
+            if (fp->ipAddressChoice->type ==
+                IPAddressChoice_addressesOrRanges) {
+                if (fc->ipAddressChoice->type == IPAddressChoice_inherit
+                    || addr_contains(fp->ipAddressChoice->u.addressesOrRanges,
+                                     fc->ipAddressChoice->u.addressesOrRanges,
+                                     length_from_afi(v3_addr_get_afi(fc))))
+                    sk_IPAddressFamily_set(child, j, fp);
+                else
+                    validation_err(X509_V_ERR_UNNESTED_RESOURCE);
+            }
+        }
+    }
+
+    /*
+     * Trust anchor can't inherit.
+     */
+    OPENSSL_assert(x != NULL);
+    if (x->rfc3779_addr != NULL) {
+        for (j = 0; j < sk_IPAddressFamily_num(x->rfc3779_addr); j++) {
+            IPAddressFamily *fp =
+                sk_IPAddressFamily_value(x->rfc3779_addr, j);
+            if (fp->ipAddressChoice->type == IPAddressChoice_inherit
+                && sk_IPAddressFamily_find(child, fp) >= 0)
+                validation_err(X509_V_ERR_UNNESTED_RESOURCE);
+        }
+    }
+
+ done:
+    sk_IPAddressFamily_free(child);
+    return ret;
+}
+
+# undef validation_err
+
+/*
+ * RFC 3779 2.3 path validation -- called from X509_verify_cert().
+ */
+int v3_addr_validate_path(X509_STORE_CTX *ctx)
+{
+    return v3_addr_validate_path_internal(ctx, ctx->chain, NULL);
+}
+
+/*
+ * RFC 3779 2.3 path validation of an extension.
+ * Test whether chain covers extension.
+ */
+int v3_addr_validate_resource_set(STACK_OF(X509) *chain,
+                                  IPAddrBlocks *ext, int allow_inheritance)
+{
+    if (ext == NULL)
+        return 1;
+    if (chain == NULL || sk_X509_num(chain) == 0)
+        return 0;
+    if (!allow_inheritance && v3_addr_inherits(ext))
+        return 0;
+    return v3_addr_validate_path_internal(NULL, chain, ext);
+}
+
+#endif                          /* OPENSSL_NO_RFC3779 */