Logo Search packages:      
Sourcecode: openssl version File versions

v3_lib.c

/* v3_lib.c */
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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 "cryptlib.h"
#include <openssl/conf.h>
#include <openssl/x509v3.h>

#include "ext_dat.h"

static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL;

static int ext_cmp(const X509V3_EXT_METHOD * const *a,
            const X509V3_EXT_METHOD * const *b);
static void ext_list_free(X509V3_EXT_METHOD *ext);

int X509V3_EXT_add(X509V3_EXT_METHOD *ext)
{
      if(!ext_list && !(ext_list = sk_X509V3_EXT_METHOD_new(ext_cmp))) {
            X509V3err(X509V3_F_X509V3_EXT_ADD,ERR_R_MALLOC_FAILURE);
            return 0;
      }
      if(!sk_X509V3_EXT_METHOD_push(ext_list, ext)) {
            X509V3err(X509V3_F_X509V3_EXT_ADD,ERR_R_MALLOC_FAILURE);
            return 0;
      }
      return 1;
}

static int ext_cmp(const X509V3_EXT_METHOD * const *a,
            const X509V3_EXT_METHOD * const *b)
{
      return ((*a)->ext_nid - (*b)->ext_nid);
}

X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid)
{
      X509V3_EXT_METHOD tmp, *t = &tmp, **ret;
      int idx;
      if(nid < 0) return NULL;
      tmp.ext_nid = nid;
      ret = (X509V3_EXT_METHOD **) OBJ_bsearch((char *)&t,
                  (char *)standard_exts, STANDARD_EXTENSION_COUNT,
                  sizeof(X509V3_EXT_METHOD *), (int (*)(const void *, const void *))ext_cmp);
      if(ret) return *ret;
      if(!ext_list) return NULL;
      idx = sk_X509V3_EXT_METHOD_find(ext_list, &tmp);
      if(idx == -1) return NULL;
      return sk_X509V3_EXT_METHOD_value(ext_list, idx);
}

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_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)
{
      X509V3_EXT_METHOD *ext, *tmpext;
      if(!(ext = X509V3_EXT_get_nid(nid_from))) {
            X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,X509V3_R_EXTENSION_NOT_FOUND);
            return 0;
      }
      if(!(tmpext = (X509V3_EXT_METHOD *)OPENSSL_malloc(sizeof(X509V3_EXT_METHOD)))) {
            X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,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)
{
      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, 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) {
            X509V3err(X509V3_F_X509V3_ADD1_I2D, 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))
            X509V3err(X509V3_F_X509V3_ADD1_I2D, errcode);
      return 0;
}

IMPLEMENT_STACK_OF(X509V3_EXT_METHOD)

Generated by  Doxygen 1.6.0   Back to index