heimdal/lib/krb5/convert_creds.c

/*
 * 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("$Id$");

#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_message (context, ENOMEM, N_("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_message (context, ret,
				N_("converting credentials: %s",
				  "already localized"),
				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;
}