+/*
+ * 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 <assert.h>
+#include "cryptlib.h"
+#include <openssl/conf.h>
+#include <openssl/asn1.h>
+#include <openssl/asn1t.h>
+#include <openssl/x509v3.h>
+
+#ifdef OPENSSL_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 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 void addr_expand(unsigned char *addr,
+ const ASN1_BIT_STRING *bs,
+ const int length,
+ const unsigned char fill)
+{
+ assert(bs->length >= 0 && bs->length <= length);
+ 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);
+}
+
+/*
+ * 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;
+
+ switch (afi) {
+ case IANA_AFI_IPV4:
+ addr_expand(addr, bs, 4, fill);
+ BIO_printf(out, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
+ break;
+ case IANA_AFI_IPV6:
+ addr_expand(addr, bs, 16, fill);
+ 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, ":");
+ 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(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 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.
+ */
+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:
+ addr_expand(addr_a, a->u.addressPrefix, length, 0x00);
+ prefixlen_a = addr_prefixlen(a->u.addressPrefix);
+ break;
+ case IPAddressOrRange_addressRange:
+ addr_expand(addr_a, a->u.addressRange->min, length, 0x00);
+ prefixlen_a = length * 8;
+ break;
+ }
+
+ switch (b->type) {
+ case IPAddressOrRange_addressPrefix:
+ addr_expand(addr_b, b->u.addressPrefix, length, 0x00);
+ prefixlen_b = addr_prefixlen(b->u.addressPrefix);
+ break;
+ case IPAddressOrRange_addressRange:
+ addr_expand(addr_b, b->u.addressRange->min, length, 0x00);
+ 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;
+
+ 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;
+ 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);
+ 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:
+ sk_IPAddressOrRange_set_cmp_func(aors, v4IPAddressOrRange_cmp);
+ break;
+ case IANA_AFI_IPV6:
+ 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 void extract_min_max(IPAddressOrRange *aor,
+ unsigned char *min,
+ unsigned char *max,
+ int length)
+{
+ assert(aor != NULL && min != NULL && max != NULL);
+ switch (aor->type) {
+ case IPAddressOrRange_addressPrefix:
+ addr_expand(min, aor->u.addressPrefix, length, 0x00);
+ addr_expand(max, aor->u.addressPrefix, length, 0xFF);
+ return;
+ case IPAddressOrRange_addressRange:
+ addr_expand(min, aor->u.addressRange->min, length, 0x00);
+ addr_expand(max, aor->u.addressRange->max, length, 0xFF);
+ return;
+ }
+}
+
+/*
+ * 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))
+ return 0;
+ extract_min_max(aor, min, max, afi_length);
+ 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);
+
+ extract_min_max(a, a_min, a_max, length);
+ extract_min_max(b, b_min, b_max, length);
+
+ /*
+ * 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 final range to see if it should be a prefix.
+ */
+ j = sk_IPAddressOrRange_num(aors) - 1;
+ {
+ IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
+ if (a->type == IPAddressOrRange_addressRange) {
+ extract_min_max(a, a_min, a_max, length);
+ if (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];
+
+ extract_min_max(a, a_min, a_max, length);
+ extract_min_max(b, b_min, b_max, length);
+
+ /*
+ * 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;
+ sk_IPAddressOrRange_set(aors, i, merged);
+ sk_IPAddressOrRange_delete(aors, i + 1);
+ IPAddressOrRange_free(a);
+ IPAddressOrRange_free(b);
+ --i;
+ continue;
+ }
+ }
+
+ 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;
+ }
+ sk_IPAddressFamily_sort(addr);
+ assert(v3_addr_is_canonical(addr));
+ return 1;
+}
+
+/*
+ * v2i handler for the IPAddrBlocks extension.
+ */
+static void *v2i_IPAddrBlocks(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 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 = strdup(t);
+ } else {
+ s = 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 (!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
+ */
+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++) {
+ extract_min_max(sk_IPAddressOrRange_value(child, c),
+ c_min, c_max, length);
+ for (;; p++) {
+ if (p >= sk_IPAddressOrRange_num(parent))
+ return 0;
+ extract_min_max(sk_IPAddressOrRange_value(parent, p),
+ p_min, p_max, length);
+ 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;
+ 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 = sk_IPAddressFamily_value(b, j);
+ 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.
+ */
+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;
+
+ assert(chain != NULL && sk_X509_num(chain) > 0);
+ assert(ctx != NULL || ext != NULL);
+ 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);
+ assert(x != NULL);
+ if ((ext = x->rfc3779_addr) == NULL)
+ goto done;
+ }
+ if (!v3_addr_is_canonical(ext))
+ validation_err(X509_V_ERR_INVALID_EXTENSION);
+ 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);
+ 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);
+ 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;
+ }
+ 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.
+ */
+ 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_RFC3779 */
projects / openssl.git / commitdiff