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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/krb/mk_rep.c */
/*
* Copyright 1990 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
/*
* Copyright (c) 2006-2008, Novell, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * 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.
* * The copyright holder's name is not used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 "k5-int.h"
#include "int-proto.h"
#include "auth_con.h"
/*
Formats a KRB_AP_REP message into outbuf.
The outbuf buffer storage is allocated, and should be freed by the
caller when finished.
returns system errors
*/
static krb5_error_code
k5_mk_rep(krb5_context context, krb5_auth_context auth_context,
krb5_data *outbuf, int dce_style)
{
krb5_error_code retval;
krb5_ap_rep_enc_part repl;
krb5_ap_rep reply;
krb5_data * scratch;
krb5_data * toutbuf;
/* Make the reply */
if (((auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) ||
(auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE)) &&
(auth_context->local_seq_number == 0)) {
if ((retval = krb5_generate_seq_number(context,
&auth_context->key->keyblock,
&auth_context->local_seq_number)))
return(retval);
}
if (dce_style) {
krb5_us_timeofday(context, &repl.ctime, &repl.cusec);
} else {
repl.ctime = auth_context->authentp->ctime;
repl.cusec = auth_context->authentp->cusec;
}
if (dce_style)
repl.subkey = NULL;
else if (auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_USE_SUBKEY) {
assert(auth_context->negotiated_etype != ENCTYPE_NULL);
retval = k5_generate_and_save_subkey(context, auth_context,
&auth_context->key->keyblock,
auth_context->negotiated_etype);
if (retval)
return retval;
repl.subkey = &auth_context->send_subkey->keyblock;
} else
repl.subkey = auth_context->authentp->subkey;
if (dce_style)
repl.seq_number = auth_context->remote_seq_number;
else
repl.seq_number = auth_context->local_seq_number;
TRACE_MK_REP(context, repl.ctime, repl.cusec, repl.subkey,
repl.seq_number);
/* encode it before encrypting */
if ((retval = encode_krb5_ap_rep_enc_part(&repl, &scratch)))
return retval;
if ((retval = k5_encrypt_keyhelper(context, auth_context->key,
KRB5_KEYUSAGE_AP_REP_ENCPART, scratch,
&reply.enc_part)))
goto cleanup_scratch;
if (!(retval = encode_krb5_ap_rep(&reply, &toutbuf))) {
*outbuf = *toutbuf;
free(toutbuf);
}
memset(reply.enc_part.ciphertext.data, 0, reply.enc_part.ciphertext.length);
free(reply.enc_part.ciphertext.data);
reply.enc_part.ciphertext.length = 0;
reply.enc_part.ciphertext.data = 0;
cleanup_scratch:
memset(scratch->data, 0, scratch->length);
krb5_free_data(context, scratch);
return retval;
}
krb5_error_code KRB5_CALLCONV
krb5_mk_rep(krb5_context context, krb5_auth_context auth_context, krb5_data *outbuf)
{
return k5_mk_rep(context, auth_context, outbuf, 0);
}
krb5_error_code KRB5_CALLCONV
krb5_mk_rep_dce(krb5_context context, krb5_auth_context auth_context, krb5_data *outbuf)
{
return k5_mk_rep(context, auth_context, outbuf, 1);
}
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