p12_npas.c

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/* p12_npas.c */
/* Written by Dr Stephen N Henson ([email protected]) 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
 *    [email protected].
 *
 * 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
 * ([email protected]).  This product includes software written by Tim
 * Hudson ([email protected]).
 *
 */

#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);
            if (!alg_get(p7->d.encrypted->enc_data->algorithm,
                &pbe_nid, &pbe_iter, &pbe_saltlen))
                {
                sk_PKCS12_SAFEBAG_pop_free(bags,
                        PKCS12_SAFEBAG_free);
                bags = NULL;
                }
        } 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;
    if (!alg_get(bag->value.shkeybag->algor, &p8_nid, &p8_iter,
                            &p8_saltlen))
        return 0;
    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);
    if (!pbe)
        return 0;
        *pnid = OBJ_obj2nid(alg->algorithm);
    *piter = ASN1_INTEGER_get(pbe->iter);
    *psaltlen = pbe->salt->length;
        PBEPARAM_free(pbe);
        return 1;
}