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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_priv.c,v 1.29 2001/05/14 06:14:49 assar Exp $");
/*
*
*/
krb5_error_code
krb5_mk_priv(krb5_context context,
krb5_auth_context auth_context,
const krb5_data *userdata,
krb5_data *outbuf,
/*krb5_replay_data*/ void *outdata)
{
krb5_error_code ret;
KRB_PRIV s;
EncKrbPrivPart part;
u_char *buf;
size_t buf_size;
size_t len;
u_int32_t tmp_seq;
krb5_keyblock *key;
int32_t sec, usec;
KerberosTime sec2;
int usec2;
krb5_crypto crypto;
/* XXX - Is this right? */
if (auth_context->local_subkey)
key = auth_context->local_subkey;
else if (auth_context->remote_subkey)
key = auth_context->remote_subkey;
else
key = auth_context->keyblock;
krb5_us_timeofday (context, &sec, &usec);
part.user_data = *userdata;
sec2 = sec;
part.timestamp = &sec2;
usec2 = usec;
part.usec = &usec2;
if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
tmp_seq = auth_context->local_seqnumber;
part.seq_number = &tmp_seq;
} else {
part.seq_number = NULL;
}
part.s_address = auth_context->local_address;
part.r_address = auth_context->remote_address;
buf_size = 1024;
buf = malloc (buf_size);
if (buf == NULL) {
krb5_set_error_string (context, "malloc: out of memory");
return ENOMEM;
}
krb5_data_zero (&s.enc_part.cipher);
do {
ret = encode_EncKrbPrivPart (buf + buf_size - 1, buf_size,
&part, &len);
if (ret) {
if (ret == ASN1_OVERFLOW) {
u_char *tmp;
buf_size *= 2;
tmp = realloc (buf, buf_size);
if (tmp == NULL) {
krb5_set_error_string (context, "malloc: out of memory");
ret = ENOMEM;
goto fail;
}
buf = tmp;
} else {
goto fail;
}
}
} while(ret == ASN1_OVERFLOW);
s.pvno = 5;
s.msg_type = krb_priv;
s.enc_part.etype = key->keytype;
s.enc_part.kvno = NULL;
ret = krb5_crypto_init(context, key, 0, &crypto);
if (ret) {
free (buf);
return ret;
}
ret = krb5_encrypt (context,
crypto,
KRB5_KU_KRB_PRIV,
buf + buf_size - len,
len,
&s.enc_part.cipher);
krb5_crypto_destroy(context, crypto);
if (ret) {
free(buf);
return ret;
}
do {
ret = encode_KRB_PRIV (buf + buf_size - 1, buf_size, &s, &len);
if (ret){
if (ret == ASN1_OVERFLOW) {
u_char *tmp;
buf_size *= 2;
tmp = realloc (buf, buf_size);
if (tmp == NULL) {
krb5_set_error_string (context, "malloc: out of memory");
ret = ENOMEM;
goto fail;
}
buf = tmp;
} else {
goto fail;
}
}
} while(ret == ASN1_OVERFLOW);
krb5_data_free (&s.enc_part.cipher);
outbuf->length = len;
outbuf->data = malloc (len);
if (outbuf->data == NULL) {
krb5_set_error_string (context, "malloc: out of memory");
free(buf);
return ENOMEM;
}
memcpy (outbuf->data, buf + buf_size - len, len);
free (buf);
if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE)
auth_context->local_seqnumber =
(auth_context->local_seqnumber + 1) & 0xFFFFFFFF;
return 0;
fail:
free (buf);
krb5_data_free (&s.enc_part.cipher);
return ret;
}
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