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/*
* Copyright (c) 1997 - 2004 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 22050 2007-11-11 11:20:46Z lha $");
#include "krb5-v4compat.h"
static krb5_error_code
check_ticket_flags(TicketFlags f)
{
return 0; /* maybe add some more tests here? */
}
/**
* 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'.
*
* @param context Kerberos 5 context.
* @param in_cred the credential to convert
* @param v4creds the converted credential
*
* @return Returns 0 to indicate success. Otherwise an kerberos et
* error code is returned, see krb5_get_error_message().
*
* @ingroup krb5_v4compat
*/
krb5_error_code KRB5_LIB_FUNCTION
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_principal_get_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;
}
/**
* Convert the v5 credentials in in_cred to v4-dito in v4creds,
* check the credential cache ccache before checking with the KDC.
*
* @param context Kerberos 5 context.
* @param ccache credential cache used to check for des-ticket.
* @param in_cred the credential to convert
* @param v4creds the converted credential
*
* @return Returns 0 to indicate success. Otherwise an kerberos et
* error code is returned, see krb5_get_error_message().
*
* @ingroup krb5_v4compat
*/
krb5_error_code KRB5_LIB_FUNCTION
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_cred_contents (context, &template);
return ret;
}
ret = krb5_copy_principal (context, in_cred->server, &template.server);
if (ret) {
krb5_free_cred_contents (context, &template);
return ret;
}
ret = krb5_get_credentials (context, 0, ccache,
&template, &v5_creds);
krb5_free_cred_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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