/* p12_npas.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).

 *

 */

#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.

 */

EXPORT_C 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;

}