125 lines
3.7 KiB
C
125 lines
3.7 KiB
C
/*
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* Copyright (c) 1997 - 1999 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "rsh_locl.h"
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RCSID("$Id: common.c,v 1.12 1999/12/02 17:04:56 joda Exp $");
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ssize_t
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do_read (int fd,
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void *buf,
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size_t sz)
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{
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int ret;
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if (do_encrypt) {
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#ifdef KRB4
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if (auth_method == AUTH_KRB4) {
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return des_enc_read (fd, buf, sz, schedule, &iv);
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} else
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#endif /* KRB4 */
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if(auth_method == AUTH_KRB5) {
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u_int32_t len, outer_len;
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int status;
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krb5_data data;
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void *edata;
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ret = krb5_net_read (context, &fd, &len, 4);
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if (ret <= 0)
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return ret;
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len = ntohl(len);
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if (len > sz)
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abort ();
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outer_len = krb5_get_wrapped_length (context, crypto, len);
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edata = malloc (outer_len);
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if (edata == NULL)
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errx (1, "malloc: cannot allocate %u bytes", outer_len);
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ret = krb5_net_read (context, &fd, edata, outer_len);
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if (ret <= 0)
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return ret;
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status = krb5_decrypt(context, crypto, KRB5_KU_OTHER_ENCRYPTED,
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edata, outer_len, &data);
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free (edata);
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if (status)
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errx (1, "%s", krb5_get_err_text (context, status));
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memcpy (buf, data.data, len);
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krb5_data_free (&data);
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return len;
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} else {
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abort ();
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}
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} else
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return read (fd, buf, sz);
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}
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ssize_t
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do_write (int fd, void *buf, size_t sz)
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{
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if (do_encrypt) {
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#ifdef KRB4
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if(auth_method == AUTH_KRB4) {
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return des_enc_write (fd, buf, sz, schedule, &iv);
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} else
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#endif /* KRB4 */
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if(auth_method == AUTH_KRB5) {
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krb5_error_code status;
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krb5_data data;
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u_int32_t len;
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int ret;
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status = krb5_encrypt(context, crypto, KRB5_KU_OTHER_ENCRYPTED,
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buf, sz, &data);
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if (status)
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errx (1, "%s", krb5_get_err_text(context, status));
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assert (krb5_get_wrapped_length (context, crypto,
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sz) == data.length);
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len = htonl(sz);
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ret = krb5_net_write (context, &fd, &len, 4);
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if (ret != 4)
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return ret;
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ret = krb5_net_write (context, &fd, data.data, data.length);
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if (ret != data.length)
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return ret;
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free (data.data);
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return sz;
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} else {
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abort();
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}
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} else
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return write (fd, buf, sz);
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}
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