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/*
* Copyright (c) 1997 - 2002 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 "krb5_locl.h"
RCSID("$Id: convert_creds.c,v 1.26 2003/03/18 03:11:16 lha Exp $");
#include "krb5-v4compat.h"
static krb5_error_code
check_ticket_flags(TicketFlags f)
{
return 0; /* maybe add some more tests here? */
}
/* include this here, to avoid dependencies on libkrb */
static const int _tkt_lifetimes[TKTLIFENUMFIXED] = {
38400, 41055, 43894, 46929, 50174, 53643, 57352, 61318,
65558, 70091, 74937, 80119, 85658, 91581, 97914, 104684,
111922, 119661, 127935, 136781, 146239, 156350, 167161, 178720,
191077, 204289, 218415, 233517, 249664, 266926, 285383, 305116,
326213, 348769, 372885, 398668, 426234, 455705, 487215, 520904,
556921, 595430, 636601, 680618, 727680, 777995, 831789, 889303,
950794, 1016537, 1086825, 1161973, 1242318, 1328218, 1420057, 1518247,
1623226, 1735464, 1855462, 1983758, 2120925, 2267576, 2424367, 2592000
};
int
_krb5_krb_time_to_life(time_t start, time_t end)
{
int i;
time_t life = end - start;
if (life > MAXTKTLIFETIME || life <= 0)
return 0;
#if 0
if (krb_no_long_lifetimes)
return (life + 5*60 - 1)/(5*60);
#endif
if (end >= NEVERDATE)
return TKTLIFENOEXPIRE;
if (life < _tkt_lifetimes[0])
return (life + 5*60 - 1)/(5*60);
for (i=0; i<TKTLIFENUMFIXED; i++)
if (life <= _tkt_lifetimes[i])
return i + TKTLIFEMINFIXED;
return 0;
}
time_t
_krb5_krb_life_to_time(int start, int life_)
{
unsigned char life = (unsigned char) life_;
#if 0
if (krb_no_long_lifetimes)
return start + life*5*60;
#endif
if (life == TKTLIFENOEXPIRE)
return NEVERDATE;
if (life < TKTLIFEMINFIXED)
return start + life*5*60;
if (life > TKTLIFEMAXFIXED)
return start + MAXTKTLIFETIME;
return start + _tkt_lifetimes[life - TKTLIFEMINFIXED];
}
/* Convert the v5 credentials in `in_cred' to v4-dito in `v4creds'.
* This is done by sending them to the 524 function in the KDC. If
* `in_cred' doesn't contain a DES session key, then a new one is
* gotten from the KDC and stored in the cred cache `ccache'.
*/
krb5_error_code
krb524_convert_creds_kdc(krb5_context context,
krb5_creds *in_cred,
struct credentials *v4creds)
{
krb5_error_code ret;
krb5_data reply;
krb5_storage *sp;
int32_t tmp;
krb5_data ticket;
char realm[REALM_SZ];
krb5_creds *v5_creds = in_cred;
ret = check_ticket_flags(v5_creds->flags.b);
if(ret)
goto out2;
{
krb5_krbhst_handle handle;
ret = krb5_krbhst_init(context,
*krb5_princ_realm(context,
v5_creds->server),
KRB5_KRBHST_KRB524,
&handle);
if (ret)
goto out2;
ret = krb5_sendto (context,
&v5_creds->ticket,
handle,
&reply);
krb5_krbhst_free(context, handle);
if (ret)
goto out2;
}
sp = krb5_storage_from_mem(reply.data, reply.length);
if(sp == NULL) {
ret = ENOMEM;
krb5_set_error_string (context, "malloc: out of memory");
goto out2;
}
krb5_ret_int32(sp, &tmp);
ret = tmp;
if(ret == 0) {
memset(v4creds, 0, sizeof(*v4creds));
ret = krb5_ret_int32(sp, &tmp);
if(ret)
goto out;
v4creds->kvno = tmp;
ret = krb5_ret_data(sp, &ticket);
if(ret)
goto out;
v4creds->ticket_st.length = ticket.length;
memcpy(v4creds->ticket_st.dat, ticket.data, ticket.length);
krb5_data_free(&ticket);
ret = krb5_524_conv_principal(context,
v5_creds->server,
v4creds->service,
v4creds->instance,
v4creds->realm);
if(ret)
goto out;
v4creds->issue_date = v5_creds->times.starttime;
v4creds->lifetime = _krb5_krb_time_to_life(v4creds->issue_date,
v5_creds->times.endtime);
ret = krb5_524_conv_principal(context, v5_creds->client,
v4creds->pname,
v4creds->pinst,
realm);
if(ret)
goto out;
memcpy(v4creds->session, v5_creds->session.keyvalue.data, 8);
} else {
krb5_set_error_string(context, "converting credentials: %s",
krb5_get_err_text(context, ret));
}
out:
krb5_storage_free(sp);
krb5_data_free(&reply);
out2:
if (v5_creds != in_cred)
krb5_free_creds (context, v5_creds);
return ret;
}
krb5_error_code
krb524_convert_creds_kdc_ccache(krb5_context context,
krb5_ccache ccache,
krb5_creds *in_cred,
struct credentials *v4creds)
{
krb5_error_code ret;
krb5_creds *v5_creds = in_cred;
krb5_keytype keytype;
keytype = v5_creds->session.keytype;
if (keytype != ENCTYPE_DES_CBC_CRC) {
/* MIT krb524d doesn't like nothing but des-cbc-crc tickets,
so go get one */
krb5_creds template;
memset (&template, 0, sizeof(template));
template.session.keytype = ENCTYPE_DES_CBC_CRC;
ret = krb5_copy_principal (context, in_cred->client, &template.client);
if (ret) {
krb5_free_creds_contents (context, &template);
return ret;
}
ret = krb5_copy_principal (context, in_cred->server, &template.server);
if (ret) {
krb5_free_creds_contents (context, &template);
return ret;
}
ret = krb5_get_credentials (context, 0, ccache,
&template, &v5_creds);
krb5_free_creds_contents (context, &template);
if (ret)
return ret;
}
ret = krb524_convert_creds_kdc(context, v5_creds, v4creds);
if (v5_creds != in_cred)
krb5_free_creds (context, v5_creds);
return ret;
}
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