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x509_v3.c
/* crypto/x509/x509_v3.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <openssl/stack.h>
#include "cryptlib.h"
#include <openssl/asn1.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>

int X509v3_get_ext_count(const STACK_OF(X509_EXTENSION) *x)
      {
      if (x == NULL) return(0);
      return(sk_X509_EXTENSION_num(x));
      }

int X509v3_get_ext_by_NID(const STACK_OF(X509_EXTENSION) *x, int nid,
                    int lastpos)
      {
      ASN1_OBJECT *obj;

      obj=OBJ_nid2obj(nid);
      if (obj == NULL) return(-2);
      return(X509v3_get_ext_by_OBJ(x,obj,lastpos));
      }

int X509v3_get_ext_by_OBJ(const STACK_OF(X509_EXTENSION) *sk, ASN1_OBJECT *obj,
                    int lastpos)
      {
      int n;
      X509_EXTENSION *ex;

      if (sk == NULL) return(-1);
      lastpos++;
      if (lastpos < 0)
            lastpos=0;
      n=sk_X509_EXTENSION_num(sk);
      for ( ; lastpos < n; lastpos++)
            {
            ex=sk_X509_EXTENSION_value(sk,lastpos);
            if (OBJ_cmp(ex->object,obj) == 0)
                  return(lastpos);
            }
      return(-1);
      }

int X509v3_get_ext_by_critical(const STACK_OF(X509_EXTENSION) *sk, int crit,
                         int lastpos)
      {
      int n;
      X509_EXTENSION *ex;

      if (sk == NULL) return(-1);
      lastpos++;
      if (lastpos < 0)
            lastpos=0;
      n=sk_X509_EXTENSION_num(sk);
      for ( ; lastpos < n; lastpos++)
            {
            ex=sk_X509_EXTENSION_value(sk,lastpos);
            if (  ((ex->critical > 0) && crit) ||
                  ((ex->critical <= 0) && !crit))
                  return(lastpos);
            }
      return(-1);
      }

X509_EXTENSION *X509v3_get_ext(const STACK_OF(X509_EXTENSION) *x, int loc)
      {
      if (x == NULL || sk_X509_EXTENSION_num(x) <= loc || loc < 0)
            return NULL;
      else
            return sk_X509_EXTENSION_value(x,loc);
      }

X509_EXTENSION *X509v3_delete_ext(STACK_OF(X509_EXTENSION) *x, int loc)
      {
      X509_EXTENSION *ret;

      if (x == NULL || sk_X509_EXTENSION_num(x) <= loc || loc < 0)
            return(NULL);
      ret=sk_X509_EXTENSION_delete(x,loc);
      return(ret);
      }

STACK_OF(X509_EXTENSION) *X509v3_add_ext(STACK_OF(X509_EXTENSION) **x,
                               X509_EXTENSION *ex, int loc)
      {
      X509_EXTENSION *new_ex=NULL;
      int n;
      STACK_OF(X509_EXTENSION) *sk=NULL;

      if (x == NULL)
            {
            X509err(X509_F_X509V3_ADD_EXT,ERR_R_PASSED_NULL_PARAMETER);
            goto err2;
            }

      if (*x == NULL)
            {
            if ((sk=sk_X509_EXTENSION_new_null()) == NULL)
                  goto err;
            }
      else
            sk= *x;

      n=sk_X509_EXTENSION_num(sk);
      if (loc > n) loc=n;
      else if (loc < 0) loc=n;

      if ((new_ex=X509_EXTENSION_dup(ex)) == NULL)
            goto err2;
      if (!sk_X509_EXTENSION_insert(sk,new_ex,loc))
            goto err;
      if (*x == NULL)
            *x=sk;
      return(sk);
err:
      X509err(X509_F_X509V3_ADD_EXT,ERR_R_MALLOC_FAILURE);
err2:
      if (new_ex != NULL) X509_EXTENSION_free(new_ex);
      if (sk != NULL) sk_X509_EXTENSION_free(sk);
      return(NULL);
      }

X509_EXTENSION *X509_EXTENSION_create_by_NID(X509_EXTENSION **ex, int nid,
           int crit, ASN1_OCTET_STRING *data)
      {
      ASN1_OBJECT *obj;
      X509_EXTENSION *ret;

      obj=OBJ_nid2obj(nid);
      if (obj == NULL)
            {
            X509err(X509_F_X509_EXTENSION_CREATE_BY_NID,X509_R_UNKNOWN_NID);
            return(NULL);
            }
      ret=X509_EXTENSION_create_by_OBJ(ex,obj,crit,data);
      if (ret == NULL) ASN1_OBJECT_free(obj);
      return(ret);
      }

X509_EXTENSION *X509_EXTENSION_create_by_OBJ(X509_EXTENSION **ex,
           ASN1_OBJECT *obj, int crit, ASN1_OCTET_STRING *data)
      {
      X509_EXTENSION *ret;

      if ((ex == NULL) || (*ex == NULL))
            {
            if ((ret=X509_EXTENSION_new()) == NULL)
                  {
                  X509err(X509_F_X509_EXTENSION_CREATE_BY_OBJ,ERR_R_MALLOC_FAILURE);
                  return(NULL);
                  }
            }
      else
            ret= *ex;

      if (!X509_EXTENSION_set_object(ret,obj))
            goto err;
      if (!X509_EXTENSION_set_critical(ret,crit))
            goto err;
      if (!X509_EXTENSION_set_data(ret,data))
            goto err;
      
      if ((ex != NULL) && (*ex == NULL)) *ex=ret;
      return(ret);
err:
      if ((ex == NULL) || (ret != *ex))
            X509_EXTENSION_free(ret);
      return(NULL);
      }

int X509_EXTENSION_set_object(X509_EXTENSION *ex, ASN1_OBJECT *obj)
      {
      if ((ex == NULL) || (obj == NULL))
            return(0);
      ASN1_OBJECT_free(ex->object);
      ex->object=OBJ_dup(obj);
      return(1);
      }

int X509_EXTENSION_set_critical(X509_EXTENSION *ex, int crit)
      {
      if (ex == NULL) return(0);
      ex->critical=(crit)?0xFF:-1;
      return(1);
      }

int X509_EXTENSION_set_data(X509_EXTENSION *ex, ASN1_OCTET_STRING *data)
      {
      int i;

      if (ex == NULL) return(0);
      i=M_ASN1_OCTET_STRING_set(ex->value,data->data,data->length);
      if (!i) return(0);
      return(1);
      }

ASN1_OBJECT *X509_EXTENSION_get_object(X509_EXTENSION *ex)
      {
      if (ex == NULL) return(NULL);
      return(ex->object);
      }

ASN1_OCTET_STRING *X509_EXTENSION_get_data(X509_EXTENSION *ex)
      {
      if (ex == NULL) return(NULL);
      return(ex->value);
      }

int X509_EXTENSION_get_critical(X509_EXTENSION *ex)
      {
      if (ex == NULL) return(0);
      if(ex->critical > 0) return 1;
      return 0;
      }

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