/*
* Copyright (C) 2006 American Registry for Internet Numbers ("ARIN")
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ARIN DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ARIN BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id$ */
/*
* Implementation of RFC 3779 section 2.2.
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "cryptlib.h"
#include <openssl/conf.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/x509v3.h>
/*
* 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
/*
* How much buffer space do we need for the text form of an address?
* Output routines (inet_ntop() or whatever) must check for overflow.
*/
#define ADDR_TXT_BUF_LEN 48
/*
* 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.
*/
static unsigned afi_from_addressfamily(const IPAddressFamily *f)
{
return ((f->addressFamily->data[0] << 8) |
(f->addressFamily->data[1]));
}
/*
* 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];
char buf[ADDR_TXT_BUF_LEN];
int i;
switch (afi) {
case IANA_AFI_IPV4:
addr_expand(addr, bs, 4, fill);
if (!inet_ntop(AF_INET, addr, buf, sizeof(buf)))
return 0;
BIO_puts(out, buf);
break;
case IANA_AFI_IPV6:
addr_expand(addr, bs, 16, fill);
if (!inet_ntop(AF_INET6, addr, buf, sizeof(buf)))
return 0;
BIO_puts(out, buf);
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 = afi_from_addressfamily(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, prefixlen_b;
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.
*/
static int 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.
*/
static int 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.
*/
static int 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;
}
}
/*
* 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);
/*
* Resolve any 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);
/*
* If a contains b, we can just get rid of b.
*/
if (memcmp(a_max, b_max, length) >= 0) {
sk_IPAddressOrRange_delete(aors, i + 1);
IPAddressOrRange_free(b);
--i;
continue;
}
/*
* If a and b are adjacent or overlap, merge them. 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;
}
/*
* 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;
}
/*
* 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, af, i1, i2, delim, host_prefixlength;
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:
af = AF_INET;
host_prefixlength = 32;
addr_chars = v4addr_chars;
break;
case IANA_AFI_IPV6:
af = AF_INET6;
host_prefixlength = 128;
addr_chars = v6addr_chars;
break;
}
/*
* 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 (!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 (inet_pton(af, s, min) != 1) {
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 (!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 (inet_pton(af, s + i1, max) != 1) {
X509V3err(X509V3_F_V2I_IPADDRBLOCKS, X509V3_R_INVALID_IPADDRESS);
X509V3_conf_err(val);
goto err;
}
if (!addr_add_range(addr, afi, safi, min, max)) {
X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
goto err;
}
break;
case '\0':
if (!addr_add_prefix(addr, afi, safi, min, host_prefixlength)) {
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.
*/
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,
afi_from_addressfamily(f)))
goto err;
}
sk_IPAddressFamily_sort(addr);
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 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;
}
}
}
/*
* Validation error handling via callback.
*/
#define validation_err(_err_) \
do { \
ctx->error = _err_; \
ctx->error_depth = i; \
ctx->current_cert = x; \
ret = ctx->verify_cb(0, ctx); \
if (!ret) \
goto done; \
} while (0)
/*
* RFC 3779 2.3 path validation. Intended to be called from X509_verify_cert().
*/
int v3_addr_validate_path(X509_STORE_CTX *ctx)
{
IPAddrBlocks *parent = NULL, *child = NULL;
int i, j, has_ext, ret = 1;
X509 *x;
assert(ctx->verify_cb);
/*
* Start with the ancestral cert. It can't inherit anything.
*/
i = sk_X509_num(ctx->chain) - 1;
x = sk_X509_value(ctx->chain, i);
assert(x != NULL);
parent = X509_get_ext_d2i(x, NID_sbgp_ipAddrBlock, NULL, NULL);
has_ext = parent != NULL;
if (has_ext) {
for (j = 0; j < sk_IPAddressFamily_num(parent); j++) {
IPAddressFamily *fp = sk_IPAddressFamily_value(parent, j);
assert(fp != NULL && fp->ipAddressChoice != NULL);
if (fp->ipAddressChoice->type == IPAddressChoice_inherit) {
validation_err(X509_V_ERR_UNNESTED_RESOURCE);
goto done; /* callback insisted on continuing */
}
}
sk_IPAddressFamily_set_cmp_func(parent, IPAddressFamily_cmp);
}
/*
* Now walk down the chain. No cert may list resources that its
* parent doesn't list.
*/
while (--i >= 0) {
x = sk_X509_value(ctx->chain, i);
assert(x != NULL);
assert(child == NULL);
child = X509_get_ext_d2i(x, NID_sbgp_ipAddrBlock, NULL, NULL);
if (child == NULL) {
has_ext = 0;
} else if (!has_ext) {
validation_err(X509_V_ERR_UNNESTED_RESOURCE);
has_ext = 1; /* callback insists on continuing */
}
if (has_ext) {
/*
* Clean out address families that child doesn't use.
* (Need to do this before modifying child....)
*/
sk_IPAddressFamily_set_cmp_func(child, IPAddressFamily_cmp);
for (j = 0; j < sk_IPAddressFamily_num(parent); j++) {
IPAddressFamily *fp = sk_IPAddressFamily_value(parent, j);
if (sk_IPAddressFamily_find(child, fp) < 0) {
IPAddressFamily_free(fp);
sk_IPAddressFamily_delete(parent, j);
--j;
}
}
/*
* Check all remaining address families in child.
*/
for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
int k = sk_IPAddressFamily_find(parent, fc);
if (k < 0)
validation_err(X509_V_ERR_UNNESTED_RESOURCE);
if (k >= 0 &&
fc->ipAddressChoice->type == IPAddressChoice_addressesOrRanges) {
IPAddressFamily *fp = sk_IPAddressFamily_value(parent, k);
if (!addr_contains(fp->ipAddressChoice->u.addressesOrRanges,
fc->ipAddressChoice->u.addressesOrRanges,
length_from_afi(afi_from_addressfamily(fc))))
validation_err(X509_V_ERR_UNNESTED_RESOURCE);
IPAddressFamily_free(fp);
sk_IPAddressFamily_set(parent, k, fc);
sk_IPAddressFamily_delete(child, j);
--j;
}
}
}
sk_IPAddressFamily_pop_free(child, IPAddressFamily_free);
child = NULL;
}
done:
sk_IPAddressFamily_pop_free(parent, IPAddressFamily_free);
sk_IPAddressFamily_pop_free(child, IPAddressFamily_free);
return ret;
}
#undef validation_err