/* $OpenBSD: p12_kiss.c,v 1.30 2026/01/27 14:14:20 tb Exp $ */
/* 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 <openssl/pkcs12.h>

#include "err_local.h"
#include "pkcs12_local.h"

/* Simplified PKCS#12 routines */

static int parse_pk12( PKCS12 *p12, const char *pass, int passlen,
    EVP_PKEY **pkey, STACK_OF(X509) *ocerts);

static int parse_bags( STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass,
    int passlen, EVP_PKEY **pkey, STACK_OF(X509) *ocerts);

static int parse_bag( PKCS12_SAFEBAG *bag, const char *pass, int passlen,
    EVP_PKEY **pkey, STACK_OF(X509) *ocerts);

/* Parse and decrypt a PKCS#12 structure returning user key, user cert
 * and other (CA) certs. Note either ca should be NULL, *ca should be NULL,
 * or it should point to a valid STACK structure. pkey and cert can be
 * passed uninitialised.
 */

int
PKCS12_parse(PKCS12 *p12, const char *pass, EVP_PKEY **pkey, X509 **cert,
    STACK_OF(X509) **ca)
{
        STACK_OF(X509) *ocerts = NULL;
        X509 *x = NULL;

        if (pkey != NULL)
                *pkey = NULL;
        if (cert != NULL)
                *cert = NULL;

        if (p12 == NULL) {
                PKCS12error(PKCS12_R_INVALID_NULL_PKCS12_POINTER);
                goto err;
        }

        /* Check the mac */

        /* If password is zero length or NULL then try verifying both cases
         * to determine which password is correct. The reason for this is that
         * under PKCS#12 password based encryption no password and a zero length
         * password are two different things...
         */

        if (pass == NULL || *pass == '\0') {
                if (PKCS12_verify_mac(p12, NULL, 0))
                        pass = NULL;
                else if (PKCS12_verify_mac(p12, "", 0))
                        pass = "";
                else {
                        PKCS12error(PKCS12_R_MAC_VERIFY_FAILURE);
                        goto err;
                }
        } else if (!PKCS12_verify_mac(p12, pass, -1)) {
                PKCS12error(PKCS12_R_MAC_VERIFY_FAILURE);
                goto err;
        }

        /* Allocate stack for other certificates */
        if ((ocerts = sk_X509_new_null()) == NULL) {
                PKCS12error(ERR_R_MALLOC_FAILURE);
                goto err;
        }

        if (!parse_pk12(p12, pass, -1, pkey, ocerts)) {
                PKCS12error(PKCS12_R_PARSE_ERROR);
                goto err;
        }

        while ((x = sk_X509_pop(ocerts)) != NULL) {
                if (pkey != NULL && *pkey != NULL &&
                    cert != NULL && *cert == NULL) {
                        ERR_set_mark();
                        if (X509_check_private_key(x, *pkey)) {
                                *cert = x;
                                x = NULL;
                        }
                        ERR_pop_to_mark();
                }

                if (ca != NULL && x != NULL) {
                        if (*ca == NULL)
                                *ca = sk_X509_new_null();
                        if (*ca == NULL)
                                goto err;
                        if (!sk_X509_push(*ca, x))
                                goto err;
                        x = NULL;
                }
                X509_free(x);
                x = NULL;
        }

        sk_X509_pop_free(ocerts, X509_free);

        return 1;

err:
        if (pkey != NULL)
                EVP_PKEY_free(*pkey);
        if (cert != NULL)
                X509_free(*cert);
        X509_free(x);
        sk_X509_pop_free(ocerts, X509_free);

        return 0;
}
LCRYPTO_ALIAS(PKCS12_parse);

/* Parse the outer PKCS#12 structure */

static int
parse_pk12(PKCS12 *p12, const char *pass, int passlen, EVP_PKEY **pkey,
    STACK_OF(X509) *ocerts)
{
        STACK_OF(PKCS7) *asafes;
        STACK_OF(PKCS12_SAFEBAG) *bags;
        int i, bagnid;
        PKCS7 *p7;

        if (!(asafes = PKCS12_unpack_authsafes(p12)))
                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, pass, passlen);
                } else
                        continue;
                if (!bags) {
                        sk_PKCS7_pop_free(asafes, PKCS7_free);
                        return 0;
                }
                if (!parse_bags(bags, pass, passlen, pkey, ocerts)) {
                        sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
                        sk_PKCS7_pop_free(asafes, PKCS7_free);
                        return 0;
                }
                sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
        }
        sk_PKCS7_pop_free(asafes, PKCS7_free);
        return 1;
}

static int
parse_bags(STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass, int passlen,
    EVP_PKEY **pkey, STACK_OF(X509) *ocerts)
{
        int i;

        for (i = 0; i < sk_PKCS12_SAFEBAG_num(bags); i++) {
                if (!parse_bag(sk_PKCS12_SAFEBAG_value(bags, i), pass, passlen,
                    pkey, ocerts))
                        return 0;
        }
        return 1;
}

static int
parse_bag(PKCS12_SAFEBAG *bag, const char *pass, int passlen, EVP_PKEY **pkey,
    STACK_OF(X509) *ocerts)
{
        PKCS8_PRIV_KEY_INFO *p8;
        X509 *x509;
        const ASN1_TYPE *attrib;
        ASN1_BMPSTRING *fname = NULL;
        ASN1_OCTET_STRING *lkid = NULL;

        if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_friendlyName))) {
                if (attrib->type != V_ASN1_BMPSTRING)
                        return 0;
                fname = attrib->value.bmpstring;
        }

        if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_localKeyID))) {
                if (attrib->type != V_ASN1_OCTET_STRING)
                        return 0;
                lkid = attrib->value.octet_string;
        }

        switch (OBJ_obj2nid(bag->type)) {
        case NID_keyBag:
                if (!pkey || *pkey)
                        return 1;
                if (!(*pkey = EVP_PKCS82PKEY(bag->value.keybag)))
                        return 0;
                break;

        case NID_pkcs8ShroudedKeyBag:
                if (!pkey || *pkey)
                        return 1;
                if (!(p8 = PKCS12_decrypt_skey(bag, pass, passlen)))
                        return 0;
                *pkey = EVP_PKCS82PKEY(p8);
                PKCS8_PRIV_KEY_INFO_free(p8);
                if (!(*pkey))
                        return 0;
                break;

        case NID_certBag:
                if (OBJ_obj2nid(bag->value.bag->type) != NID_x509Certificate )
                        return 1;
                if (!(x509 = PKCS12_certbag2x509(bag)))
                        return 0;
                if (lkid && !X509_keyid_set1(x509, lkid->data, lkid->length)) {
                        X509_free(x509);
                        return 0;
                }
                if (fname) {
                        int len, r;
                        unsigned char *data = NULL;
                        len = ASN1_STRING_to_UTF8(&data, fname);
                        if (len >= 0) {
                                r = X509_alias_set1(x509, data, len);
                                free(data);
                                if (!r) {
                                        X509_free(x509);
                                        return 0;
                                }
                        }
                }

                if (!sk_X509_push(ocerts, x509)) {
                        X509_free(x509);
                        return 0;
                }

                break;

        case NID_safeContentsBag:
                return parse_bags(bag->value.safes, pass, passlen,
                    pkey, ocerts);
                break;

        default:
                return 1;
                break;
        }
        return 1;
}