118 lines
4.0 KiB
C
118 lines
4.0 KiB
C
/*
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* Copyright (c) 1995-2000 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: decomp_ticket.c,v 1.3 2001/09/17 12:21:42 assar Exp $");
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/*
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* This routine takes a ticket and pointers to the variables that
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* should be filled in based on the information in the ticket. It
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* fills in values for its arguments.
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*
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* The routine returns KFAILURE if any of the "pname", "pinstance",
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* or "prealm" fields is too big, otherwise it returns KSUCCESS.
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*
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* The corresponding routine to generate tickets is create_ticket.
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* When changes are made to this routine, the corresponding changes
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* should also be made to that file.
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*
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* See create_ticket.c for the format of the ticket packet.
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*/
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int
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decomp_ticket(KTEXT tkt, /* The ticket to be decoded */
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unsigned char *flags, /* Kerberos ticket flags */
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char *pname, /* Authentication name */
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char *pinstance, /* Principal's instance */
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char *prealm, /* Principal's authentication domain */
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u_int32_t *paddress,/* Net address of entity requesting ticket */
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unsigned char *session, /* Session key inserted in ticket */
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int *life, /* Lifetime of the ticket */
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u_int32_t *time_sec, /* Issue time and date */
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char *sname, /* Service name */
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char *sinstance, /* Service instance */
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des_cblock *key, /* Service's secret key (to decrypt the ticket) */
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des_key_schedule schedule) /* The precomputed key schedule */
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{
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unsigned char *p = tkt->dat;
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int little_endian;
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des_pcbc_encrypt(tkt->dat, tkt->dat,
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tkt->length, schedule, key, DES_DECRYPT);
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tkt->mbz = 0;
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*flags = *p++;
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little_endian = *flags & 1;
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if(strlen((char*)p) > ANAME_SZ)
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return KFAILURE;
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p += krb_get_string(p, pname, ANAME_SZ);
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if(strlen((char*)p) > INST_SZ)
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return KFAILURE;
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p += krb_get_string(p, pinstance, INST_SZ);
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if(strlen((char*)p) > REALM_SZ)
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return KFAILURE;
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p += krb_get_string(p, prealm, REALM_SZ);
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if (*prealm == '\0')
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krb_get_lrealm (prealm, 1);
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if(tkt->length - (p - tkt->dat) < 8 + 1 + 4)
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return KFAILURE;
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p += krb_get_address(p, paddress);
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memcpy(session, p, 8);
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p += 8;
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*life = *p++;
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p += krb_get_int(p, time_sec, 4, little_endian);
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if(strlen((char*)p) > SNAME_SZ)
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return KFAILURE;
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p += krb_get_string(p, sname, SNAME_SZ);
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if(strlen((char*)p) > INST_SZ)
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return KFAILURE;
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p += krb_get_string(p, sinstance, INST_SZ);
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return KSUCCESS;
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}
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