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/*
* Copyright (c) 1995, 1996, 1997, 1998 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.
*/
#include "krb_locl.h"
RCSID("$Id: create_ciph.c,v 1.13 1999/12/02 16:58:41 joda Exp $");
/*
* This routine is used by the authentication server to create
* a packet for its client, containing a ticket for the requested
* service (given in "tkt"), and some information about the ticket,
*
* Returns KSUCCESS no matter what.
*
* The length of the cipher is stored in c->length; the format of
* c->dat is as follows:
*
* variable
* type or constant data
* ---- ----------- ----
*
*
* 8 bytes session session key for client, service
*
* string service service name
*
* string instance service instance
*
* string realm KDC realm
*
* unsigned char life ticket lifetime
*
* unsigned char kvno service key version number
*
* unsigned char tkt->length length of following ticket
*
* data tkt->dat ticket for service
*
* 4 bytes kdc_time KDC's timestamp
*
* <=7 bytes null null pad to 8 byte multiple
*
*/
int
create_ciph(KTEXT c, /* Text block to hold ciphertext */
unsigned char *session, /* Session key to send to user */
char *service, /* Service name on ticket */
char *instance, /* Instance name on ticket */
char *realm, /* Realm of this KDC */
u_int32_t life, /* Lifetime of the ticket */
int kvno, /* Key version number for service */
KTEXT tkt, /* The ticket for the service */
u_int32_t kdc_time, /* KDC time */
des_cblock *key) /* Key to encrypt ciphertext with */
{
unsigned char *p = c->dat;
size_t rem = sizeof(c->dat);
int tmp;
memset(c, 0, sizeof(KTEXT_ST));
if (rem < 8)
return KFAILURE;
memcpy(p, session, 8);
p += 8;
rem -= 8;
tmp = krb_put_nir(service, instance, realm, p, rem);
if (tmp < 0)
return KFAILURE;
p += tmp;
rem -= tmp;
tmp = krb_put_int(life, p, rem, 1);
if (tmp < 0)
return KFAILURE;
p += tmp;
rem -= tmp;
tmp = krb_put_int(kvno, p, rem, 1);
if (tmp < 0)
return KFAILURE;
p += tmp;
rem -= tmp;
tmp = krb_put_int(tkt->length, p, rem, 1);
if (tmp < 0)
return KFAILURE;
p += tmp;
rem -= tmp;
if (rem < tkt->length)
return KFAILURE;
memcpy(p, tkt->dat, tkt->length);
p += tkt->length;
rem -= tkt->length;
tmp = krb_put_int(kdc_time, p, rem, 4);
if (tmp < 0)
return KFAILURE;
p += tmp;
rem -= tmp;
/* multiple of eight bytes */
c->length = (p - c->dat + 7) & ~7;
encrypt_ktext(c, key, DES_ENCRYPT);
return KSUCCESS;
}
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