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/*
* Copyright (C) 2012 Red Hat Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
* * 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.
* * The names of contributors to this software may not be
* used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS 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
* COPYRIGHT OWNER OR 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.
*
* Author: Stef Walter <stefw@redhat.com>
*/
#include "config.h"
#include "asn1.h"
#define P11_DEBUG_FLAG P11_DEBUG_TRUST
#include "debug.h"
#include "oid.h"
#include "x509.h"
#include <stdlib.h>
#include <string.h>
unsigned char *
p11_x509_find_extension (node_asn *cert,
const unsigned char *oid,
const unsigned char *der,
size_t der_len,
size_t *ext_len)
{
char field[128];
char *value;
int start;
int end;
int ret;
int len;
int i;
return_val_if_fail (cert != NULL, NULL);
return_val_if_fail (oid != NULL, NULL);
return_val_if_fail (ext_len != NULL, NULL);
for (i = 1; ; i++) {
if (snprintf (field, sizeof (field), "tbsCertificate.extensions.?%u.extnID", i) < 0)
return_val_if_reached (NULL);
ret = asn1_der_decoding_startEnd (cert, der, der_len, field, &start, &end);
/* No more extensions */
if (ret == ASN1_ELEMENT_NOT_FOUND)
break;
return_val_if_fail (ret == ASN1_SUCCESS, NULL);
/* Make sure it's a straightforward oid with certain assumptions */
if (!p11_oid_simple (der + start, (end - start) + 1))
continue;
/* The one we're lookin for? */
if (!p11_oid_equal (der + start, oid))
continue;
if (snprintf (field, sizeof (field), "tbsCertificate.extensions.?%u.extnValue", i) < 0)
return_val_if_reached (NULL);
len = 0;
ret = asn1_read_value (cert, field, NULL, &len);
return_val_if_fail (ret == ASN1_MEM_ERROR, NULL);
value = malloc (len);
return_val_if_fail (value != NULL, NULL);
ret = asn1_read_value (cert, field, value, &len);
return_val_if_fail (ret == ASN1_SUCCESS, NULL);
*ext_len = len;
return (unsigned char *)value;
}
return NULL;
}
bool
p11_x509_parse_basic_constraints (p11_dict *asn1_defs,
const unsigned char *ext_der,
size_t ext_len,
bool *is_ca)
{
char buffer[8];
node_asn *ext;
int ret;
int len;
return_val_if_fail (is_ca != NULL, false);
ext = p11_asn1_decode (asn1_defs, "PKIX1.BasicConstraints", ext_der, ext_len, NULL);
if (ext == NULL)
return false;
len = sizeof (buffer);
ret = asn1_read_value (ext, "cA", buffer, &len);
return_val_if_fail (ret == ASN1_SUCCESS, false);
*is_ca = (strcmp (buffer, "TRUE") == 0);
asn1_delete_structure (&ext);
return true;
}
bool
p11_x509_parse_key_usage (p11_dict *asn1_defs,
const unsigned char *ext_der,
size_t ext_len,
unsigned int *ku)
{
char message[ASN1_MAX_ERROR_DESCRIPTION_SIZE] = { 0, };
unsigned char buf[2];
node_asn *ext;
int len;
int ret;
ext = p11_asn1_decode (asn1_defs, "PKIX1.KeyUsage", ext_der, ext_len, message);
if (ext == NULL)
return false;
len = sizeof (buf);
ret = asn1_read_value (ext, "", buf, &len);
return_val_if_fail (ret == ASN1_SUCCESS, false);
/* A bit string, so combine into one set of flags */
*ku = buf[0] | (buf[1] << 8);
asn1_delete_structure (&ext);
return true;
}
p11_array *
p11_x509_parse_extended_key_usage (p11_dict *asn1_defs,
const unsigned char *ext_der,
size_t ext_len)
{
node_asn *asn;
char field[128];
p11_array *ekus;
char *eku;
int ret;
int len;
int i;
asn = p11_asn1_decode (asn1_defs, "PKIX1.ExtKeyUsageSyntax", ext_der, ext_len, NULL);
if (asn == NULL)
return NULL;
ekus = p11_array_new (free);
for (i = 1; ; i++) {
if (snprintf (field, sizeof (field), "?%u", i) < 0)
return_val_if_reached (NULL);
len = 0;
ret = asn1_read_value (asn, field, NULL, &len);
if (ret == ASN1_ELEMENT_NOT_FOUND)
break;
return_val_if_fail (ret == ASN1_MEM_ERROR, NULL);
eku = malloc (len + 1);
return_val_if_fail (eku != NULL, NULL);
ret = asn1_read_value (asn, field, eku, &len);
return_val_if_fail (ret == ASN1_SUCCESS, NULL);
eku[len] = 0;
/* If it's our reserved OID, then skip */
if (strcmp (eku, P11_OID_RESERVED_PURPOSE_STR) == 0) {
free (eku);
continue;
}
if (!p11_array_push (ekus, eku))
return_val_if_reached (NULL);
}
asn1_delete_structure (&asn);
return ekus;
}
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