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