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/*
* Copyright (c) 1997 - 2001 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: mk_rep.c,v 1.19 2001/05/14 06:14:49 assar Exp $");
krb5_error_code
krb5_mk_rep(krb5_context context,
krb5_auth_context auth_context,
krb5_data *outbuf)
{
krb5_error_code ret;
AP_REP ap;
EncAPRepPart body;
u_char *buf = NULL;
size_t buf_size;
size_t len;
krb5_crypto crypto;
ap.pvno = 5;
ap.msg_type = krb_ap_rep;
memset (&body, 0, sizeof(body));
body.ctime = auth_context->authenticator->ctime;
body.cusec = auth_context->authenticator->cusec;
body.subkey = NULL;
if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
krb5_generate_seq_number (context,
auth_context->keyblock,
&auth_context->local_seqnumber);
body.seq_number = malloc (sizeof(*body.seq_number));
if (body.seq_number == NULL) {
krb5_set_error_string (context, "malloc: out of memory");
return ENOMEM;
}
*(body.seq_number) = auth_context->local_seqnumber;
} else
body.seq_number = NULL;
ap.enc_part.etype = auth_context->keyblock->keytype;
ap.enc_part.kvno = NULL;
buf_size = length_EncAPRepPart(&body);
buf = malloc (buf_size);
if (buf == NULL) {
free_EncAPRepPart (&body);
krb5_set_error_string (context, "malloc: out of memory");
return ENOMEM;
}
ret = krb5_encode_EncAPRepPart (context,
buf + buf_size - 1,
buf_size,
&body,
&len);
free_EncAPRepPart (&body);
ret = krb5_crypto_init(context, auth_context->keyblock,
0 /* ap.enc_part.etype */, &crypto);
if (ret) {
free (buf);
return ret;
}
ret = krb5_encrypt (context,
crypto,
KRB5_KU_AP_REQ_ENC_PART,
buf + buf_size - len,
len,
&ap.enc_part.cipher);
krb5_crypto_destroy(context, crypto);
if (ret) {
free(buf);
return ret;
}
buf_size = length_AP_REP(&ap);
buf = realloc(buf, buf_size);
if(buf == NULL) {
free_AP_REP (&ap);
krb5_set_error_string (context, "malloc: out of memory");
return ENOMEM;
}
ret = encode_AP_REP (buf + buf_size - 1, buf_size, &ap, &len);
free_AP_REP (&ap);
if(len != buf_size)
krb5_abortx(context, "krb5_mk_rep: encoded length != calculated length");
outbuf->data = buf;
outbuf->length = len;
return 0;
}
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