72 lines
2.5 KiB
C
72 lines
2.5 KiB
C
/*
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* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb_locl.h"
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RCSID("$Id: krb_check_auth.c,v 1.5 1999/12/02 16:58:42 joda Exp $");
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/*
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*
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* Receive an mutual-authenticator for a server in `packet', with
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* `checksum', `session', and `schedule' having the appropriate values
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* and return the data in `msg_data'.
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*
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* Return KSUCCESS if the received checksum is correct.
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*
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*/
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int
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krb_check_auth(KTEXT packet,
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u_int32_t checksum,
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MSG_DAT *msg_data,
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des_cblock *session,
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struct des_ks_struct *schedule,
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struct sockaddr_in *laddr,
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struct sockaddr_in *faddr)
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{
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int ret;
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u_int32_t checksum2;
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ret = krb_rd_priv (packet->dat, packet->length, schedule, session, faddr,
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laddr, msg_data);
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if (ret != RD_AP_OK)
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return ret;
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if (msg_data->app_length != 4)
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return KFAILURE;
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krb_get_int (msg_data->app_data, &checksum2, 4, 0);
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if (checksum2 == checksum + 1)
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return KSUCCESS;
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else
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return KFAILURE;
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}
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