/* v3_lib.c */
/*
* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
* 1999.
*/
/* ====================================================================
* Copyright (c) 1999 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).
*
*/
/* X509 v3 extension utilities */
#include <stdio.h>
#include <openssl/conf.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/obj.h>
#include <openssl/x509v3.h>
#include "ext_dat.h"
static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL;
static void ext_list_free(X509V3_EXT_METHOD *ext);
static int ext_stack_cmp(const X509V3_EXT_METHOD **a,
const X509V3_EXT_METHOD **b)
{
return ((*a)->ext_nid - (*b)->ext_nid);
}
int X509V3_EXT_add(X509V3_EXT_METHOD *ext)
{
if (!ext_list && !(ext_list = sk_X509V3_EXT_METHOD_new(ext_stack_cmp))) {
OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
ext_list_free(ext);
return 0;
}
if (!sk_X509V3_EXT_METHOD_push(ext_list, ext)) {
OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
ext_list_free(ext);
return 0;
}
return 1;
}
static int ext_cmp(const void *void_a, const void *void_b)
{
const X509V3_EXT_METHOD **a = (const X509V3_EXT_METHOD **)void_a;
const X509V3_EXT_METHOD **b = (const X509V3_EXT_METHOD **)void_b;
return ext_stack_cmp(a, b);
}
const X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid)
{
X509V3_EXT_METHOD tmp;
const X509V3_EXT_METHOD *t = &tmp, *const *ret;
size_t idx;
if (nid < 0)
return NULL;
tmp.ext_nid = nid;
ret =
bsearch(&t, standard_exts, STANDARD_EXTENSION_COUNT,
sizeof(X509V3_EXT_METHOD *), ext_cmp);
if (ret)
return *ret;
if (!ext_list)
return NULL;
if (!sk_X509V3_EXT_METHOD_find(ext_list, &idx, &tmp))
return NULL;
return sk_X509V3_EXT_METHOD_value(ext_list, idx);
}
const X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext)
{
int nid;
if ((nid = OBJ_obj2nid(ext->object)) == NID_undef)
return NULL;
return X509V3_EXT_get_nid(nid);
}
int X509V3_EXT_free(int nid, void *ext_data)
{
const X509V3_EXT_METHOD *ext_method = X509V3_EXT_get_nid(nid);
if (ext_method == NULL) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_CANNOT_FIND_FREE_FUNCTION);
return 0;
}
if (ext_method->it != NULL)
ASN1_item_free(ext_data, ASN1_ITEM_ptr(ext_method->it));
else if (ext_method->ext_free != NULL)
ext_method->ext_free(ext_data);
else {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_CANNOT_FIND_FREE_FUNCTION);
return 0;
}
return 1;
}
int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist)
{
for (; extlist->ext_nid != -1; extlist++)
if (!X509V3_EXT_add(extlist))
return 0;
return 1;
}
int X509V3_EXT_add_alias(int nid_to, int nid_from)
{
const X509V3_EXT_METHOD *ext;
X509V3_EXT_METHOD *tmpext;
if (!(ext = X509V3_EXT_get_nid(nid_from))) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_NOT_FOUND);
return 0;
}
if (!
(tmpext =
(X509V3_EXT_METHOD *)OPENSSL_malloc(sizeof(X509V3_EXT_METHOD)))) {
OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
return 0;
}
*tmpext = *ext;
tmpext->ext_nid = nid_to;
tmpext->ext_flags |= X509V3_EXT_DYNAMIC;
return X509V3_EXT_add(tmpext);
}
void X509V3_EXT_cleanup(void)
{
sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free);
ext_list = NULL;
}
static void ext_list_free(X509V3_EXT_METHOD *ext)
{
if (ext->ext_flags & X509V3_EXT_DYNAMIC)
OPENSSL_free(ext);
}
/*
* Legacy function: we don't need to add standard extensions any more because
* they are now kept in ext_dat.h.
*/
int X509V3_add_standard_extensions(void)
{
return 1;
}
/* Return an extension internal structure */
void *X509V3_EXT_d2i(X509_EXTENSION *ext)
{
const X509V3_EXT_METHOD *method;
const unsigned char *p;
if (!(method = X509V3_EXT_get(ext)))
return NULL;
p = ext->value->data;
if (method->it)
return ASN1_item_d2i(NULL, &p, ext->value->length,
ASN1_ITEM_ptr(method->it));
return method->d2i(NULL, &p, ext->value->length);
}
/*
* Get critical flag and decoded version of extension from a NID. The "idx"
* variable returns the last found extension and can be used to retrieve
* multiple extensions of the same NID. However multiple extensions with the
* same NID is usually due to a badly encoded certificate so if idx is NULL
* we choke if multiple extensions exist. The "crit" variable is set to the
* critical value. The return value is the decoded extension or NULL on
* error. The actual error can have several different causes, the value of
* *crit reflects the cause: >= 0, extension found but not decoded (reflects
* critical value). -1 extension not found. -2 extension occurs more than
* once.
*/
void *X509V3_get_d2i(STACK_OF(X509_EXTENSION) *x, int nid, int *crit,
int *idx)
{
int lastpos;
size_t i;
X509_EXTENSION *ex, *found_ex = NULL;
if (!x) {
if (idx)
*idx = -1;
if (crit)
*crit = -1;
return NULL;
}
if (idx)
lastpos = *idx + 1;
else
lastpos = 0;
if (lastpos < 0)
lastpos = 0;
for (i = lastpos; i < sk_X509_EXTENSION_num(x); i++) {
ex = sk_X509_EXTENSION_value(x, i);
if (OBJ_obj2nid(ex->object) == nid) {
if (idx) {
*idx = i;
found_ex = ex;
break;
} else if (found_ex) {
/* Found more than one */
if (crit)
*crit = -2;
return NULL;
}
found_ex = ex;
}
}
if (found_ex) {
/* Found it */
if (crit)
*crit = X509_EXTENSION_get_critical(found_ex);
return X509V3_EXT_d2i(found_ex);
}
/* Extension not found */
if (idx)
*idx = -1;
if (crit)
*crit = -1;
return NULL;
}
/*
* This function is a general extension append, replace and delete utility.
* The precise operation is governed by the 'flags' value. The 'crit' and
* 'value' arguments (if relevant) are the extensions internal structure.
*/
int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
int crit, unsigned long flags)
{
int extidx = -1;
int errcode;
X509_EXTENSION *ext, *extmp;
unsigned long ext_op = flags & X509V3_ADD_OP_MASK;
/*
* If appending we don't care if it exists, otherwise look for existing
* extension.
*/
if (ext_op != X509V3_ADD_APPEND)
extidx = X509v3_get_ext_by_NID(*x, nid, -1);
/* See if extension exists */
if (extidx >= 0) {
/* If keep existing, nothing to do */
if (ext_op == X509V3_ADD_KEEP_EXISTING)
return 1;
/* If default then its an error */
if (ext_op == X509V3_ADD_DEFAULT) {
errcode = X509V3_R_EXTENSION_EXISTS;
goto err;
}
/* If delete, just delete it */
if (ext_op == X509V3_ADD_DELETE) {
if (!sk_X509_EXTENSION_delete(*x, extidx))
return -1;
return 1;
}
} else {
/*
* If replace existing or delete, error since extension must exist
*/
if ((ext_op == X509V3_ADD_REPLACE_EXISTING) ||
(ext_op == X509V3_ADD_DELETE)) {
errcode = X509V3_R_EXTENSION_NOT_FOUND;
goto err;
}
}
/*
* If we get this far then we have to create an extension: could have
* some flags for alternative encoding schemes...
*/
ext = X509V3_EXT_i2d(nid, crit, value);
if (!ext) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_ERROR_CREATING_EXTENSION);
return 0;
}
/* If extension exists replace it.. */
if (extidx >= 0) {
extmp = sk_X509_EXTENSION_value(*x, extidx);
X509_EXTENSION_free(extmp);
if (!sk_X509_EXTENSION_set(*x, extidx, ext))
return -1;
return 1;
}
if (!*x && !(*x = sk_X509_EXTENSION_new_null()))
return -1;
if (!sk_X509_EXTENSION_push(*x, ext))
return -1;
return 1;
err:
if (!(flags & X509V3_ADD_SILENT))
OPENSSL_PUT_ERROR(X509V3, errcode);
return 0;
}