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/*
* Copyright (c) 1997 - 1999 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 "rsh_locl.h"
RCSID("$Id: common.c,v 1.12 1999/12/02 17:04:56 joda Exp $");
ssize_t
do_read (int fd,
void *buf,
size_t sz)
{
int ret;
if (do_encrypt) {
#ifdef KRB4
if (auth_method == AUTH_KRB4) {
return des_enc_read (fd, buf, sz, schedule, &iv);
} else
#endif /* KRB4 */
if(auth_method == AUTH_KRB5) {
u_int32_t len, outer_len;
int status;
krb5_data data;
void *edata;
ret = krb5_net_read (context, &fd, &len, 4);
if (ret <= 0)
return ret;
len = ntohl(len);
if (len > sz)
abort ();
outer_len = krb5_get_wrapped_length (context, crypto, len);
edata = malloc (outer_len);
if (edata == NULL)
errx (1, "malloc: cannot allocate %u bytes", outer_len);
ret = krb5_net_read (context, &fd, edata, outer_len);
if (ret <= 0)
return ret;
status = krb5_decrypt(context, crypto, KRB5_KU_OTHER_ENCRYPTED,
edata, outer_len, &data);
free (edata);
if (status)
errx (1, "%s", krb5_get_err_text (context, status));
memcpy (buf, data.data, len);
krb5_data_free (&data);
return len;
} else {
abort ();
}
} else
return read (fd, buf, sz);
}
ssize_t
do_write (int fd, void *buf, size_t sz)
{
if (do_encrypt) {
#ifdef KRB4
if(auth_method == AUTH_KRB4) {
return des_enc_write (fd, buf, sz, schedule, &iv);
} else
#endif /* KRB4 */
if(auth_method == AUTH_KRB5) {
krb5_error_code status;
krb5_data data;
u_int32_t len;
int ret;
status = krb5_encrypt(context, crypto, KRB5_KU_OTHER_ENCRYPTED,
buf, sz, &data);
if (status)
errx (1, "%s", krb5_get_err_text(context, status));
assert (krb5_get_wrapped_length (context, crypto,
sz) == data.length);
len = htonl(sz);
ret = krb5_net_write (context, &fd, &len, 4);
if (ret != 4)
return ret;
ret = krb5_net_write (context, &fd, data.data, data.length);
if (ret != data.length)
return ret;
free (data.data);
return sz;
} else {
abort();
}
} else
return write (fd, buf, sz);
}
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