/* v3_akey.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 "cryptlib.h"

#include <openssl/conf.h>

#include <openssl/asn1.h>

#include <openssl/asn1t.h>

#include <openssl/x509v3.h>

static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,

                                                 AUTHORITY_KEYID *akeyid,

                                                 STACK_OF(CONF_VALUE)

                                                 *extlist);

static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,

                                            X509V3_CTX *ctx,

                                            STACK_OF(CONF_VALUE) *values);

const X509V3_EXT_METHOD v3_akey_id = {

    NID_authority_key_identifier,

    X509V3_EXT_MULTILINE, ASN1_ITEM_ref(AUTHORITY_KEYID),

    0, 0, 0, 0,

    0, 0,

    (X509V3_EXT_I2V) i2v_AUTHORITY_KEYID,

    (X509V3_EXT_V2I)v2i_AUTHORITY_KEYID,

    0, 0,

    NULL

};

static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,

                                                 AUTHORITY_KEYID *akeyid,

                                                 STACK_OF(CONF_VALUE)

                                                 *extlist)

{

    char *tmp;

    if (akeyid->keyid) {

        tmp = hex_to_string(akeyid->keyid->data, akeyid->keyid->length);

        X509V3_add_value("keyid", tmp, &extlist);

        OPENSSL_free(tmp);

    }

    if (akeyid->issuer)

        extlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer, extlist);

    if (akeyid->serial) {

        tmp = hex_to_string(akeyid->serial->data, akeyid->serial->length);

        X509V3_add_value("serial", tmp, &extlist);

        OPENSSL_free(tmp);

    }

    return extlist;

}

/*-

 * Currently two options:

 * keyid: use the issuers subject keyid, the value 'always' means its is

 * an error if the issuer certificate doesn't have a key id.

 * issuer: use the issuers cert issuer and serial number. The default is

 * to only use this if keyid is not present. With the option 'always'

 * this is always included.

 */

static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,

                                            X509V3_CTX *ctx,

                                            STACK_OF(CONF_VALUE) *values)

{

    char keyid = 0, issuer = 0;

    int i;

    CONF_VALUE *cnf;

    ASN1_OCTET_STRING *ikeyid = NULL;

    X509_NAME *isname = NULL;

    GENERAL_NAMES *gens = NULL;

    GENERAL_NAME *gen = NULL;

    ASN1_INTEGER *serial = NULL;

    X509_EXTENSION *ext;

    X509 *cert;

    AUTHORITY_KEYID *akeyid;

    for (i = 0; i < sk_CONF_VALUE_num(values); i++) {

        cnf = sk_CONF_VALUE_value(values, i);

        if (!strcmp(cnf->name, "keyid")) {

            keyid = 1;

            if (cnf->value && !strcmp(cnf->value, "always"))

                keyid = 2;

        } else if (!strcmp(cnf->name, "issuer")) {

            issuer = 1;

            if (cnf->value && !strcmp(cnf->value, "always"))

                issuer = 2;

        } else {

            X509V3err(X509V3_F_V2I_AUTHORITY_KEYID, X509V3_R_UNKNOWN_OPTION);

            ERR_add_error_data(2, "name=", cnf->name);

            return NULL;

        }

    }

    if (!ctx || !ctx->issuer_cert) {

        if (ctx && (ctx->flags == CTX_TEST))

            return AUTHORITY_KEYID_new();

        X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,

                  X509V3_R_NO_ISSUER_CERTIFICATE);

        return NULL;

    }

    cert = ctx->issuer_cert;

    if (keyid) {

        i = X509_get_ext_by_NID(cert, NID_subject_key_identifier, -1);

        if ((i >= 0) && (ext = X509_get_ext(cert, i)))

            ikeyid = X509V3_EXT_d2i(ext);

        if (keyid == 2 && !ikeyid) {

            X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,

                      X509V3_R_UNABLE_TO_GET_ISSUER_KEYID);

            return NULL;

        }

    }

    if ((issuer && !ikeyid) || (issuer == 2)) {

        isname = X509_NAME_dup(X509_get_issuer_name(cert));

        serial = M_ASN1_INTEGER_dup(X509_get_serialNumber(cert));

        if (!isname || !serial) {

            X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,

                      X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS);

            goto err;

        }

    }

    if (!(akeyid = AUTHORITY_KEYID_new()))

        goto err;

    if (isname) {

        if (!(gens = sk_GENERAL_NAME_new_null())

            || !(gen = GENERAL_NAME_new())

            || !sk_GENERAL_NAME_push(gens, gen)) {

            X509V3err(X509V3_F_V2I_AUTHORITY_KEYID, ERR_R_MALLOC_FAILURE);

            goto err;

        }

        gen->type = GEN_DIRNAME;

        gen->d.dirn = isname;

    }

    akeyid->issuer = gens;

    akeyid->serial = serial;

    akeyid->keyid = ikeyid;

    return akeyid;

 err:

    X509_NAME_free(isname);

    M_ASN1_INTEGER_free(serial);

    M_ASN1_OCTET_STRING_free(ikeyid);

    return NULL;

}