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/*
* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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.
*/
/* $FreeBSD$ */
#include "krb_locl.h"
RCSID("$Id: krb_check_auth.c,v 1.5 1999/12/02 16:58:42 joda Exp $");
/*
*
* Receive an mutual-authenticator for a server in `packet', with
* `checksum', `session', and `schedule' having the appropriate values
* and return the data in `msg_data'.
*
* Return KSUCCESS if the received checksum is correct.
*
*/
int
krb_check_auth(KTEXT packet,
u_int32_t checksum,
MSG_DAT *msg_data,
des_cblock *session,
des_key_schedule schedule,
struct sockaddr_in *laddr,
struct sockaddr_in *faddr)
{
int ret;
u_int32_t checksum2;
ret = krb_rd_priv (packet->dat, packet->length, schedule, session, faddr,
laddr, msg_data);
if (ret != RD_AP_OK)
return ret;
if (msg_data->app_length != 4)
return KFAILURE;
krb_get_int (msg_data->app_data, &checksum2, 4, 0);
if (checksum2 == checksum + 1)
return KSUCCESS;
else
return KFAILURE;
}
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