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/*
* Copyright (c) 1997 - 1999, 2002 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 1.16 2002/09/04 15:50:36 assar Exp $");
#if defined(KRB4) || defined(KRB5)
#ifdef KRB5
int key_usage = 1026;
void *ivec_in[2];
void *ivec_out[2];
void
init_ivecs(int client)
{
size_t blocksize;
krb5_crypto_getblocksize(context, crypto, &blocksize);
ivec_in[0] = malloc(blocksize);
memset(ivec_in[0], client, blocksize);
ivec_in[1] = malloc(blocksize);
memset(ivec_in[1], 2 | client, blocksize);
ivec_out[0] = malloc(blocksize);
memset(ivec_out[0], !client, blocksize);
ivec_out[1] = malloc(blocksize);
memset(ivec_out[1], 2 | !client, blocksize);
}
#endif
ssize_t
do_read (int fd, void *buf, size_t sz, void *ivec)
{
if (do_encrypt) {
#ifdef KRB4
if (auth_method == AUTH_KRB4) {
return des_enc_read (fd, buf, sz, schedule, &iv);
} else
#endif /* KRB4 */
#ifdef KRB5
if(auth_method == AUTH_KRB5) {
krb5_error_code ret;
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 ();
/* ivec will be non null for protocol version 2 */
if(ivec != NULL)
outer_len = krb5_get_wrapped_length (context, crypto, len + 4);
else
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_ivec(context, crypto, key_usage,
edata, outer_len, &data, ivec);
free (edata);
if (status)
krb5_err (context, 1, status, "decrypting data");
if(ivec != NULL) {
unsigned long l;
if(data.length < len + 4)
errx (1, "data received is too short");
_krb5_get_int(data.data, &l, 4);
if(l != len)
errx (1, "inconsistency in received data");
memcpy (buf, (unsigned char *)data.data+4, len);
} else
memcpy (buf, data.data, len);
krb5_data_free (&data);
return len;
} else
#endif /* KRB5 */
abort ();
} else
return read (fd, buf, sz);
}
ssize_t
do_write (int fd, void *buf, size_t sz, void *ivec)
{
if (do_encrypt) {
#ifdef KRB4
if(auth_method == AUTH_KRB4) {
return des_enc_write (fd, buf, sz, schedule, &iv);
} else
#endif /* KRB4 */
#ifdef KRB5
if(auth_method == AUTH_KRB5) {
krb5_error_code status;
krb5_data data;
unsigned char len[4];
int ret;
_krb5_put_int(len, sz, 4);
if(ivec != NULL) {
unsigned char *tmp = malloc(sz + 4);
if(tmp == NULL)
err(1, "malloc");
_krb5_put_int(tmp, sz, 4);
memcpy(tmp + 4, buf, sz);
status = krb5_encrypt_ivec(context, crypto, key_usage,
tmp, sz + 4, &data, ivec);
free(tmp);
} else
status = krb5_encrypt_ivec(context, crypto, key_usage,
buf, sz, &data, ivec);
if (status)
krb5_err(context, 1, status, "encrypting data");
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
#endif /* KRB5 */
abort();
} else
return write (fd, buf, sz);
}
#endif /* KRB4 || KRB5 */
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