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p12_npas.c

/* p12_npas.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).
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <openssl/pkcs12.h>

/* PKCS#12 password change routine */

static int newpass_p12(PKCS12 *p12, char *oldpass, char *newpass);
static int newpass_bags(STACK_OF(PKCS12_SAFEBAG) *bags, char *oldpass,
                  char *newpass);
static int newpass_bag(PKCS12_SAFEBAG *bag, char *oldpass, char *newpass);
static int alg_get(X509_ALGOR *alg, int *pnid, int *piter, int *psaltlen);

/* 
 * Change the password on a PKCS#12 structure.
 */

int PKCS12_newpass(PKCS12 *p12, char *oldpass, char *newpass)
{
      /* Check for NULL PKCS12 structure */

      if(!p12) {
            PKCS12err(PKCS12_F_PKCS12_NEWPASS,PKCS12_R_INVALID_NULL_PKCS12_POINTER);
            return 0;
      }

      /* Check the mac */
      
      if (!PKCS12_verify_mac(p12, oldpass, -1)) {
            PKCS12err(PKCS12_F_PKCS12_NEWPASS,PKCS12_R_MAC_VERIFY_FAILURE);
            return 0;
      }

      if (!newpass_p12(p12, oldpass, newpass)) {
            PKCS12err(PKCS12_F_PKCS12_NEWPASS,PKCS12_R_PARSE_ERROR);
            return 0;
      }

      return 1;
}

/* Parse the outer PKCS#12 structure */

static int newpass_p12(PKCS12 *p12, char *oldpass, char *newpass)
{
      STACK_OF(PKCS7) *asafes, *newsafes;
      STACK_OF(PKCS12_SAFEBAG) *bags;
      int i, bagnid, pbe_nid = 0, pbe_iter = 0, pbe_saltlen = 0;
      PKCS7 *p7, *p7new;
      ASN1_OCTET_STRING *p12_data_tmp = NULL, *macnew = NULL;
      unsigned char mac[EVP_MAX_MD_SIZE];
      unsigned int maclen;

      if (!(asafes = PKCS12_unpack_authsafes(p12))) return 0;
      if(!(newsafes = sk_PKCS7_new_null())) return 0;
      for (i = 0; i < sk_PKCS7_num (asafes); i++) {
            p7 = sk_PKCS7_value(asafes, i);
            bagnid = OBJ_obj2nid(p7->type);
            if (bagnid == NID_pkcs7_data) {
                  bags = PKCS12_unpack_p7data(p7);
            } else if (bagnid == NID_pkcs7_encrypted) {
                  bags = PKCS12_unpack_p7encdata(p7, oldpass, -1);
                  alg_get(p7->d.encrypted->enc_data->algorithm,
                        &pbe_nid, &pbe_iter, &pbe_saltlen);
            } else continue;
            if (!bags) {
                  sk_PKCS7_pop_free(asafes, PKCS7_free);
                  return 0;
            }
            if (!newpass_bags(bags, oldpass, newpass)) {
                  sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
                  sk_PKCS7_pop_free(asafes, PKCS7_free);
                  return 0;
            }
            /* Repack bag in same form with new password */
            if (bagnid == NID_pkcs7_data) p7new = PKCS12_pack_p7data(bags);
            else p7new = PKCS12_pack_p7encdata(pbe_nid, newpass, -1, NULL,
                                     pbe_saltlen, pbe_iter, bags);
            sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
            if(!p7new) {
                  sk_PKCS7_pop_free(asafes, PKCS7_free);
                  return 0;
            }
            sk_PKCS7_push(newsafes, p7new);
      }
      sk_PKCS7_pop_free(asafes, PKCS7_free);

      /* Repack safe: save old safe in case of error */

      p12_data_tmp = p12->authsafes->d.data;
      if(!(p12->authsafes->d.data = ASN1_OCTET_STRING_new())) goto saferr;
      if(!PKCS12_pack_authsafes(p12, newsafes)) goto saferr;

      if(!PKCS12_gen_mac(p12, newpass, -1, mac, &maclen)) goto saferr;
      if(!(macnew = ASN1_OCTET_STRING_new())) goto saferr;
      if(!ASN1_OCTET_STRING_set(macnew, mac, maclen)) goto saferr;
      ASN1_OCTET_STRING_free(p12->mac->dinfo->digest);
      p12->mac->dinfo->digest = macnew;
      ASN1_OCTET_STRING_free(p12_data_tmp);

      return 1;

      saferr:
      /* Restore old safe */
      ASN1_OCTET_STRING_free(p12->authsafes->d.data);
      ASN1_OCTET_STRING_free(macnew);
      p12->authsafes->d.data = p12_data_tmp;
      return 0;

}


static int newpass_bags(STACK_OF(PKCS12_SAFEBAG) *bags, char *oldpass,
                  char *newpass)
{
      int i;
      for (i = 0; i < sk_PKCS12_SAFEBAG_num(bags); i++) {
            if (!newpass_bag(sk_PKCS12_SAFEBAG_value(bags, i),
                         oldpass, newpass))
                return 0;
      }
      return 1;
}

/* Change password of safebag: only needs handle shrouded keybags */

static int newpass_bag(PKCS12_SAFEBAG *bag, char *oldpass, char *newpass)
{
      PKCS8_PRIV_KEY_INFO *p8;
      X509_SIG *p8new;
      int p8_nid, p8_saltlen, p8_iter;

      if(M_PKCS12_bag_type(bag) != NID_pkcs8ShroudedKeyBag) return 1;

      if (!(p8 = PKCS8_decrypt(bag->value.shkeybag, oldpass, -1))) return 0;
      alg_get(bag->value.shkeybag->algor, &p8_nid, &p8_iter, &p8_saltlen);
      if(!(p8new = PKCS8_encrypt(p8_nid, NULL, newpass, -1, NULL, p8_saltlen,
                                         p8_iter, p8))) return 0;
      X509_SIG_free(bag->value.shkeybag);
      bag->value.shkeybag = p8new;
      return 1;
}

static int alg_get(X509_ALGOR *alg, int *pnid, int *piter, int *psaltlen)
{
        PBEPARAM *pbe;
        const unsigned char *p;

        p = alg->parameter->value.sequence->data;
        pbe = d2i_PBEPARAM(NULL, &p, alg->parameter->value.sequence->length);
        *pnid = OBJ_obj2nid(alg->algorithm);
      *piter = ASN1_INTEGER_get(pbe->iter);
      *psaltlen = pbe->salt->length;
        PBEPARAM_free(pbe);
        return 0;
}

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