/*
 * Copyright (c) 1997-2021 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * Copyright (c) 2021 Isaac Boukris
 * 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. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS 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 INSTITUTE OR 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.
 */

#include "krb5_locl.h"

/*
 * Add the AuthorizationData `data´ of `type´ to the last element in
 * the sequence of authorization_data in `tkt´ wrapped in an IF_RELEVANT
 */

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
_kdc_tkt_add_if_relevant_ad(krb5_context context,
			    EncTicketPart *tkt,
			    int type,
			    const krb5_data *data)
{
    krb5_error_code ret;
    size_t size = 0;

    if (tkt->authorization_data == NULL) {
	tkt->authorization_data = calloc(1, sizeof(*tkt->authorization_data));
	if (tkt->authorization_data == NULL) {
	    return krb5_enomem(context);
	}
    }

    /* add the entry to the last element */
    {
	AuthorizationData ad = { 0, NULL };
	AuthorizationDataElement ade;

	ade.ad_type = type;
	ade.ad_data = *data;

	ret = add_AuthorizationData(&ad, &ade);
	if (ret) {
	    krb5_set_error_message(context, ret, "add AuthorizationData failed");
	    return ret;
	}

	ade.ad_type = KRB5_AUTHDATA_IF_RELEVANT;

	ASN1_MALLOC_ENCODE(AuthorizationData,
			   ade.ad_data.data, ade.ad_data.length,
			   &ad, &size, ret);
	free_AuthorizationData(&ad);
	if (ret) {
	    krb5_set_error_message(context, ret, "ASN.1 encode of "
				   "AuthorizationData failed");
	    return ret;
	}
	if (ade.ad_data.length != size)
	    krb5_abortx(context, "internal asn.1 encoder error");

	ret = add_AuthorizationData(tkt->authorization_data, &ade);
	der_free_octet_string(&ade.ad_data);
	if (ret) {
	    krb5_set_error_message(context, ret, "add AuthorizationData failed");
	    return ret;
	}
    }

    return 0;
}

/*
 * Insert a PAC wrapped in AD-IF-RELEVANT container as the first AD element,
 * as some clients such as Windows may fail to parse it otherwise.
 */

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
_kdc_tkt_insert_pac(krb5_context context,
		    EncTicketPart *tkt,
		    const krb5_data *data)
{
    AuthorizationDataElement ade;
    unsigned int i;
    krb5_error_code ret;

    ret = _kdc_tkt_add_if_relevant_ad(context, tkt, KRB5_AUTHDATA_WIN2K_PAC,
				      data);
    if (ret)
	return ret;

    heim_assert(tkt->authorization_data->len != 0, "No authorization_data!");
    ade = tkt->authorization_data->val[tkt->authorization_data->len - 1];
    for (i = 0; i < tkt->authorization_data->len - 1; i++) {
	tkt->authorization_data->val[i + 1] = tkt->authorization_data->val[i];
    }
    tkt->authorization_data->val[0] = ade;

    return 0;
}