heimdal/kdc/524.c

/*
 * Copyright (c) 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 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 "kdc_locl.h"

RCSID("$Id$");

#ifdef KRB4

do_524(Ticket *t, krb5_data *reply, const char *from)
{
    krb5_error_code ret;
    krb5_principal sprinc = NULL;
    hdb_entry *server;
    Key *skey, *ekey = NULL;
    krb5_data et_data;
    EncTicketPart et;
    EncryptedData ticket;
    krb5_storage *sp;
    char *spn = NULL;
    unsigned char buf[MAX_KTXT_LEN + 4 * 4];
    size_t len;
    
    principalname2krb5_principal(&sprinc, t->sname, t->realm);
    krb5_unparse_name(context, sprinc, &spn);
    server = db_fetch(sprinc);
    if(server == NULL){
	kdc_log(0, "Request to convert ticket from %s for unknown principal %s",
		from, spn);
	goto out;
    }
    ret = hdb_etype2key(context, server, t->enc_part.etype, &skey);
    if(ret){
	kdc_log(0, "No suitable key found for server (%s) "
		"when converting ticket from ", spn, from);
	goto out;
    }
    ekey = unseal_key(skey);
    ret = krb5_decrypt (context,
			t->enc_part.cipher.data,
			t->enc_part.cipher.length,
			t->enc_part.etype,
			&ekey->key,
			&et_data);
    hdb_free_key(ekey);
    if(ret){
	kdc_log(0, "Failed to decrypt ticket from %s for %s", from, spn);
	goto out;
    }
    ret = decode_EncTicketPart(et_data.data, et_data.length, &et, &len);
    krb5_data_free(&et_data);
    if(ret){
	kdc_log(0, "Failed to decode ticket from %s for %s", from, spn);
	goto out;
    }
    {
	krb5_principal client;
	char *cpn;
	principalname2krb5_principal(&client, et.cname, et.crealm);
	krb5_unparse_name(context, client, &cpn);
	kdc_log(1, "524-REQ %s from %s for %s", cpn, from, spn);
	free(cpn);
	krb5_free_principal(context, client);
    }

    if(et.endtime < kdc_time){
	kdc_log(0, "Ticket expired (%s)", spn);
	free_EncTicketPart(&et);
	ret = KRB5KRB_AP_ERR_TKT_EXPIRED;
	goto out;
    }
    if(et.flags.invalid){
	kdc_log(0, "Ticket not valid (%s)", spn);
	free_EncTicketPart(&et);
	ret = KRB5KRB_AP_ERR_TKT_NYV;
	goto out;
    }

    ret  = encode_v4_ticket(buf + sizeof(buf) - 1, sizeof(buf),
			    &et, &t->sname, &len);
    free_EncTicketPart(&et);
    if(ret){
	kdc_log(0, "Failed to encode v4 ticket (%s)", spn);
	goto out;
    }
    ret = hdb_etype2key(context, server, KEYTYPE_DES, &skey);
    if(ret){
	kdc_log(0, "No DES key for server (%s)", spn);
	goto out;
    }
    ekey = unseal_key(skey);
    ret = encrypt_v4_ticket(buf + sizeof(buf) - len, len, 
			    ekey->key.keyvalue.data, &ticket);
    hdb_free_key(ekey);
    if(ret){
	kdc_log(0, "Failed to encrypt v4 ticket (%s)", spn);
	goto out;
    }
out:
    /* make reply */
    memset(buf, 0, sizeof(buf));
    sp = krb5_storage_from_mem(buf, sizeof(buf));
    krb5_store_int32(sp, ret);
    if(ret == 0){
	krb5_store_int32(sp, server->kvno); /* is this right? */
	krb5_store_data(sp, ticket.cipher);
	/* Aargh! This is coded as a KTEXT_ST. */
	sp->seek(sp, MAX_KTXT_LEN - ticket.cipher.length, SEEK_CUR);
	krb5_store_int32(sp, 0); /* mbz */
	free_EncryptedData(&ticket);
    }
    ret = krb5_storage_to_data(sp, reply);
    krb5_storage_free(sp);
    
    if(spn)
	free(spn);
    if(sprinc)
	krb5_free_principal(context, sprinc);
    hdb_free_entry(context, server);
    free(server);
}

#endif