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/* $OpenBSD: decomp_ticket.c,v 1.5 1997/12/12 05:30:19 art Exp $ */
/* $KTH: decomp_ticket.c,v 1.16 1997/04/01 08:18:22 joda Exp $ */
/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Kungliga Tekniska
* Högskolan and its contributors.
*
* 4. 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 "krb_locl.h"
/*
* This routine takes a ticket and pointers to the variables that
* should be filled in based on the information in the ticket. It
* fills in values for its arguments.
*
* The routine returns KFAILURE if any of the "pname", "pinstance",
* or "prealm" fields is too big, otherwise it returns KSUCCESS.
*
* The corresponding routine to generate tickets is create_ticket.
* When changes are made to this routine, the corresponding changes
* should also be made to that file.
*
* See create_ticket.c for the format of the ticket packet.
*/
int
decomp_ticket(KTEXT tkt, /* The ticket to be decoded */
unsigned char *flags, /* Kerberos ticket flags */
char *pname, /* Authentication name */
char *pinstance, /* Principal's instance */
char *prealm, /* Principal's authentication domain */
u_int32_t *paddress,/* Net address of entity requesting ticket */
unsigned char *session, /* Session key inserted in ticket */
int *life, /* Lifetime of the ticket */
u_int32_t *time_sec, /* Issue time and date */
char *sname, /* Service name */
char *sinstance, /* Service instance */
des_cblock *key, /* Service's secret key (to decrypt the ticket) */
des_key_schedule schedule) /* The precomputed key schedule */
{
unsigned char *p = tkt->dat;
int little_endian;
des_pcbc_encrypt((des_cblock *)tkt->dat, (des_cblock *)tkt->dat,
tkt->length, schedule, key, DES_DECRYPT);
tkt->mbz = 0;
*flags = *p++;
little_endian = *flags & 1;
if(strlen((char*)p) > ANAME_SZ)
return KFAILURE;
p += krb_get_string(p, pname);
if(strlen((char*)p) > INST_SZ)
return KFAILURE;
p += krb_get_string(p, pinstance);
if(strlen((char*)p) > REALM_SZ)
return KFAILURE;
p += krb_get_string(p, prealm);
if(tkt->length - (p - tkt->dat) < 8 + 1 + 4)
return KFAILURE;
p += krb_get_address(p, paddress);
memcpy(session, p, 8);
p += 8;
*life = *p++;
p += krb_get_int(p, time_sec, 4, little_endian);
if(strlen((char*)p) > SNAME_SZ)
return KFAILURE;
p += krb_get_string(p, sname);
if(strlen((char*)p) > INST_SZ)
return KFAILURE;
p += krb_get_string(p, sinstance);
return KSUCCESS;
}
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